From e08b96371625aaa84cb03f51acc4c8e0be27403a Mon Sep 17 00:00:00 2001 From: Carsten Otte Date: Wed, 4 Jan 2012 10:25:20 +0100 Subject: KVM: s390: add parameter for KVM_CREATE_VM This patch introduces a new config option for user controlled kernel virtual machines. It introduces a parameter to KVM_CREATE_VM that allows to set bits that alter the capabilities of the newly created virtual machine. The parameter is passed to kvm_arch_init_vm for all architectures. The only valid modifier bit for now is KVM_VM_S390_UCONTROL. This requires CAP_SYS_ADMIN privileges and creates a user controlled virtual machine on s390 architectures. Signed-off-by: Carsten Otte Signed-off-by: Marcelo Tosatti Signed-off-by: Avi Kivity --- arch/powerpc/kvm/powerpc.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 607fbdf24b8..83f24456987 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -171,8 +171,11 @@ void kvm_arch_check_processor_compat(void *rtn) *(int *)rtn = kvmppc_core_check_processor_compat(); } -int kvm_arch_init_vm(struct kvm *kvm) +int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) { + if (type) + return -EINVAL; + return kvmppc_core_init_vm(kvm); } -- cgit v1.2.3 From 5b1c1493afe8d69909f9df3221bb2fffdf479f4a Mon Sep 17 00:00:00 2001 From: Carsten Otte Date: Wed, 4 Jan 2012 10:25:23 +0100 Subject: KVM: s390: ucontrol: export SIE control block to user This patch exports the s390 SIE hardware control block to userspace via the mapping of the vcpu file descriptor. In order to do so, a new arch callback named kvm_arch_vcpu_fault is introduced for all architectures. It allows to map architecture specific pages. Signed-off-by: Carsten Otte Signed-off-by: Marcelo Tosatti Signed-off-by: Avi Kivity --- arch/powerpc/kvm/powerpc.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 83f24456987..a5671616af8 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -659,6 +659,11 @@ out: return r; } +int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) +{ + return VM_FAULT_SIGBUS; +} + static int kvm_vm_ioctl_get_pvinfo(struct kvm_ppc_pvinfo *pvinfo) { u32 inst_lis = 0x3c000000; -- cgit v1.2.3 From b9e5dc8d4511e6a00862a795319569e7fe7f60f4 Mon Sep 17 00:00:00 2001 From: Christian Borntraeger Date: Wed, 11 Jan 2012 11:20:30 +0100 Subject: KVM: provide synchronous registers in kvm_run On some cpus the overhead for virtualization instructions is in the same range as a system call. Having to call multiple ioctls to get set registers will make certain userspace handled exits more expensive than necessary. Lets provide a section in kvm_run that works as a shared save area for guest registers. We also provide two 64bit flags fields (architecture specific), that will specify 1. which parts of these fields are valid. 2. which registers were modified by userspace Each bit for these flag fields will define a group of registers (like general purpose) or a single register. Signed-off-by: Christian Borntraeger Signed-off-by: Marcelo Tosatti Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm.h b/arch/powerpc/include/asm/kvm.h index f7727d91ac6..7d9d4de057e 100644 --- a/arch/powerpc/include/asm/kvm.h +++ b/arch/powerpc/include/asm/kvm.h @@ -265,6 +265,10 @@ struct kvm_debug_exit_arch { struct kvm_guest_debug_arch { }; +/* definition of registers in kvm_run */ +struct kvm_sync_regs { +}; + #define KVM_REG_MASK 0x001f #define KVM_REG_EXT_MASK 0xffe0 #define KVM_REG_GPR 0x0000 -- cgit v1.2.3 From 3bf3cdcc148abcd0e9d398393d390ff136d6eb9a Mon Sep 17 00:00:00 2001 From: Scott Wood Date: Thu, 18 Aug 2011 15:25:14 -0500 Subject: KVM: PPC: e500: don't translate gfn to pfn with preemption disabled Delay allocation of the shadow pid until we're ready to disable preemption and write the entry. Signed-off-by: Scott Wood Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/e500_tlb.c | 36 +++++++++++++++++++++++------------- 1 file changed, 23 insertions(+), 13 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/e500_tlb.c b/arch/powerpc/kvm/e500_tlb.c index 13c432ea2fa..22624a7ae82 100644 --- a/arch/powerpc/kvm/e500_tlb.c +++ b/arch/powerpc/kvm/e500_tlb.c @@ -507,21 +507,16 @@ static inline void kvmppc_e500_deliver_tlb_miss(struct kvm_vcpu *vcpu, vcpu_e500->mas7 = 0; } +/* TID must be supplied by the caller */ static inline void kvmppc_e500_setup_stlbe(struct kvmppc_vcpu_e500 *vcpu_e500, struct tlbe *gtlbe, int tsize, struct tlbe_priv *priv, u64 gvaddr, struct tlbe *stlbe) { pfn_t pfn = priv->pfn; - unsigned int stid; - - stid = kvmppc_e500_get_sid(vcpu_e500, get_tlb_ts(gtlbe), - get_tlb_tid(gtlbe), - get_cur_pr(&vcpu_e500->vcpu), 0); /* Force TS=1 IPROT=0 for all guest mappings. */ - stlbe->mas1 = MAS1_TSIZE(tsize) - | MAS1_TID(stid) | MAS1_TS | MAS1_VALID; + stlbe->mas1 = MAS1_TSIZE(tsize) | MAS1_TS | MAS1_VALID; stlbe->mas2 = (gvaddr & MAS2_EPN) | e500_shadow_mas2_attrib(gtlbe->mas2, vcpu_e500->vcpu.arch.shared->msr & MSR_PR); @@ -816,6 +811,24 @@ int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, int rb) return EMULATE_DONE; } +/* sesel is index into the set, not the whole array */ +static void write_stlbe(struct kvmppc_vcpu_e500 *vcpu_e500, + struct tlbe *gtlbe, + struct tlbe *stlbe, + int stlbsel, int sesel) +{ + int stid; + + preempt_disable(); + stid = kvmppc_e500_get_sid(vcpu_e500, get_tlb_ts(gtlbe), + get_tlb_tid(gtlbe), + get_cur_pr(&vcpu_e500->vcpu), 0); + + stlbe->mas1 |= MAS1_TID(stid); + write_host_tlbe(vcpu_e500, stlbsel, sesel, stlbe); + preempt_enable(); +} + int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu) { struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu); @@ -845,7 +858,6 @@ int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu) u64 eaddr; u64 raddr; - preempt_disable(); switch (tlbsel) { case 0: /* TLB0 */ @@ -874,8 +886,8 @@ int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu) default: BUG(); } - write_host_tlbe(vcpu_e500, stlbsel, sesel, &stlbe); - preempt_enable(); + + write_stlbe(vcpu_e500, gtlbe, &stlbe, stlbsel, sesel); } kvmppc_set_exit_type(vcpu, EMULATED_TLBWE_EXITS); @@ -937,7 +949,6 @@ void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 eaddr, gpa_t gpaddr, gtlbe = &vcpu_e500->gtlb_arch[tlbsel][esel]; - preempt_disable(); switch (tlbsel) { case 0: stlbsel = 0; @@ -962,8 +973,7 @@ void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 eaddr, gpa_t gpaddr, break; } - write_host_tlbe(vcpu_e500, stlbsel, sesel, &stlbe); - preempt_enable(); + write_stlbe(vcpu_e500, gtlbe, &stlbe, stlbsel, sesel); } int kvmppc_e500_tlb_search(struct kvm_vcpu *vcpu, -- cgit v1.2.3 From 90b92a6f51af9adf8c44e8ab3f435b336e5ba6ff Mon Sep 17 00:00:00 2001 From: Scott Wood Date: Thu, 18 Aug 2011 15:25:16 -0500 Subject: KVM: PPC: e500: Eliminate preempt_disable in local_sid_destroy_all The only place it makes sense to call this function already needs to have preemption disabled. Signed-off-by: Scott Wood Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/e500_tlb.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/e500_tlb.c b/arch/powerpc/kvm/e500_tlb.c index 22624a7ae82..b976d8025e5 100644 --- a/arch/powerpc/kvm/e500_tlb.c +++ b/arch/powerpc/kvm/e500_tlb.c @@ -116,13 +116,11 @@ static inline int local_sid_lookup(struct id *entry) return -1; } -/* Invalidate all id mappings on local core */ +/* Invalidate all id mappings on local core -- call with preempt disabled */ static inline void local_sid_destroy_all(void) { - preempt_disable(); __get_cpu_var(pcpu_last_used_sid) = 0; memset(&__get_cpu_var(pcpu_sids), 0, sizeof(__get_cpu_var(pcpu_sids))); - preempt_enable(); } static void *kvmppc_e500_id_table_alloc(struct kvmppc_vcpu_e500 *vcpu_e500) -- cgit v1.2.3 From 0164c0f0c404017fb04defb0ceb23fd1c3c3a53e Mon Sep 17 00:00:00 2001 From: Scott Wood Date: Thu, 18 Aug 2011 15:25:18 -0500 Subject: KVM: PPC: e500: clear up confusion between host and guest entries Split out the portions of tlbe_priv that should be associated with host entries into tlbe_ref. Base victim selection on the number of hardware entries, not guest entries. For TLB1, where one guest entry can be mapped by multiple host entries, we use the host tlbe_ref for tracking page references. For the guest TLB0 entries, we still track it with gtlb_priv, to avoid having to retranslate if the entry is evicted from the host TLB but not the guest TLB. Signed-off-by: Scott Wood Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_e500.h | 24 ++- arch/powerpc/include/asm/mmu-book3e.h | 1 + arch/powerpc/kvm/e500_tlb.c | 267 ++++++++++++++++++++++++---------- arch/powerpc/kvm/e500_tlb.h | 17 --- 4 files changed, 213 insertions(+), 96 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_e500.h b/arch/powerpc/include/asm/kvm_e500.h index adbfca9dd10..a5197d816ec 100644 --- a/arch/powerpc/include/asm/kvm_e500.h +++ b/arch/powerpc/include/asm/kvm_e500.h @@ -32,13 +32,21 @@ struct tlbe{ #define E500_TLB_VALID 1 #define E500_TLB_DIRTY 2 -struct tlbe_priv { +struct tlbe_ref { pfn_t pfn; unsigned int flags; /* E500_TLB_* */ }; +struct tlbe_priv { + struct tlbe_ref ref; /* TLB0 only -- TLB1 uses tlb_refs */ +}; + struct vcpu_id_table; +struct kvmppc_e500_tlb_params { + int entries, ways, sets; +}; + struct kvmppc_vcpu_e500 { /* Unmodified copy of the guest's TLB. */ struct tlbe *gtlb_arch[E500_TLB_NUM]; @@ -49,6 +57,20 @@ struct kvmppc_vcpu_e500 { unsigned int gtlb_size[E500_TLB_NUM]; unsigned int gtlb_nv[E500_TLB_NUM]; + /* + * information associated with each host TLB entry -- + * TLB1 only for now. If/when guest TLB1 entries can be + * mapped with host TLB0, this will be used for that too. + * + * We don't want to use this for guest TLB0 because then we'd + * have the overhead of doing the translation again even if + * the entry is still in the guest TLB (e.g. we swapped out + * and back, and our host TLB entries got evicted). + */ + struct tlbe_ref *tlb_refs[E500_TLB_NUM]; + + unsigned int host_tlb1_nv; + u32 host_pid[E500_PID_NUM]; u32 pid[E500_PID_NUM]; u32 svr; diff --git a/arch/powerpc/include/asm/mmu-book3e.h b/arch/powerpc/include/asm/mmu-book3e.h index f5f89cafebd..a0128232d9c 100644 --- a/arch/powerpc/include/asm/mmu-book3e.h +++ b/arch/powerpc/include/asm/mmu-book3e.h @@ -167,6 +167,7 @@ #define TLBnCFG_MAXSIZE 0x000f0000 /* Maximum Page Size (v1.0) */ #define TLBnCFG_MAXSIZE_SHIFT 16 #define TLBnCFG_ASSOC 0xff000000 /* Associativity */ +#define TLBnCFG_ASSOC_SHIFT 24 /* TLBnPS encoding */ #define TLBnPS_4K 0x00000004 diff --git a/arch/powerpc/kvm/e500_tlb.c b/arch/powerpc/kvm/e500_tlb.c index b976d8025e5..59221bb1e00 100644 --- a/arch/powerpc/kvm/e500_tlb.c +++ b/arch/powerpc/kvm/e500_tlb.c @@ -12,6 +12,7 @@ * published by the Free Software Foundation. */ +#include #include #include #include @@ -26,7 +27,7 @@ #include "trace.h" #include "timing.h" -#define to_htlb1_esel(esel) (tlb1_entry_num - (esel) - 1) +#define to_htlb1_esel(esel) (host_tlb_params[1].entries - (esel) - 1) struct id { unsigned long val; @@ -63,7 +64,7 @@ static DEFINE_PER_CPU(struct pcpu_id_table, pcpu_sids); * The valid range of shadow ID is [1..255] */ static DEFINE_PER_CPU(unsigned long, pcpu_last_used_sid); -static unsigned int tlb1_entry_num; +static struct kvmppc_e500_tlb_params host_tlb_params[E500_TLB_NUM]; /* * Allocate a free shadow id and setup a valid sid mapping in given entry. @@ -237,7 +238,7 @@ void kvmppc_dump_tlbs(struct kvm_vcpu *vcpu) } } -static inline unsigned int tlb0_get_next_victim( +static inline unsigned int gtlb0_get_next_victim( struct kvmppc_vcpu_e500 *vcpu_e500) { unsigned int victim; @@ -252,7 +253,7 @@ static inline unsigned int tlb0_get_next_victim( static inline unsigned int tlb1_max_shadow_size(void) { /* reserve one entry for magic page */ - return tlb1_entry_num - tlbcam_index - 1; + return host_tlb_params[1].entries - tlbcam_index - 1; } static inline int tlbe_is_writable(struct tlbe *tlbe) @@ -302,13 +303,12 @@ static inline void __write_host_tlbe(struct tlbe *stlbe, uint32_t mas0) local_irq_restore(flags); } +/* esel is index into set, not whole array */ static inline void write_host_tlbe(struct kvmppc_vcpu_e500 *vcpu_e500, int tlbsel, int esel, struct tlbe *stlbe) { if (tlbsel == 0) { - __write_host_tlbe(stlbe, - MAS0_TLBSEL(0) | - MAS0_ESEL(esel & (KVM_E500_TLB0_WAY_NUM - 1))); + __write_host_tlbe(stlbe, MAS0_TLBSEL(0) | MAS0_ESEL(esel)); } else { __write_host_tlbe(stlbe, MAS0_TLBSEL(1) | @@ -355,8 +355,8 @@ void kvmppc_e500_tlb_put(struct kvm_vcpu *vcpu) { } -static void kvmppc_e500_stlbe_invalidate(struct kvmppc_vcpu_e500 *vcpu_e500, - int tlbsel, int esel) +static void inval_gtlbe_on_host(struct kvmppc_vcpu_e500 *vcpu_e500, + int tlbsel, int esel) { struct tlbe *gtlbe = &vcpu_e500->gtlb_arch[tlbsel][esel]; struct vcpu_id_table *idt = vcpu_e500->idt; @@ -412,18 +412,53 @@ static void kvmppc_e500_stlbe_invalidate(struct kvmppc_vcpu_e500 *vcpu_e500, preempt_enable(); } +static int tlb0_set_base(gva_t addr, int sets, int ways) +{ + int set_base; + + set_base = (addr >> PAGE_SHIFT) & (sets - 1); + set_base *= ways; + + return set_base; +} + +static int gtlb0_set_base(struct kvmppc_vcpu_e500 *vcpu_e500, gva_t addr) +{ + int sets = KVM_E500_TLB0_SIZE / KVM_E500_TLB0_WAY_NUM; + + return tlb0_set_base(addr, sets, KVM_E500_TLB0_WAY_NUM); +} + +static int htlb0_set_base(gva_t addr) +{ + return tlb0_set_base(addr, host_tlb_params[0].sets, + host_tlb_params[0].ways); +} + +static unsigned int get_tlb_esel(struct kvmppc_vcpu_e500 *vcpu_e500, int tlbsel) +{ + unsigned int esel = get_tlb_esel_bit(vcpu_e500); + + if (tlbsel == 0) { + esel &= KVM_E500_TLB0_WAY_NUM_MASK; + esel += gtlb0_set_base(vcpu_e500, vcpu_e500->mas2); + } else { + esel &= vcpu_e500->gtlb_size[tlbsel] - 1; + } + + return esel; +} + /* Search the guest TLB for a matching entry. */ static int kvmppc_e500_tlb_index(struct kvmppc_vcpu_e500 *vcpu_e500, gva_t eaddr, int tlbsel, unsigned int pid, int as) { int size = vcpu_e500->gtlb_size[tlbsel]; - int set_base; + unsigned int set_base; int i; if (tlbsel == 0) { - int mask = size / KVM_E500_TLB0_WAY_NUM - 1; - set_base = (eaddr >> PAGE_SHIFT) & mask; - set_base *= KVM_E500_TLB0_WAY_NUM; + set_base = gtlb0_set_base(vcpu_e500, eaddr); size = KVM_E500_TLB0_WAY_NUM; } else { set_base = 0; @@ -455,29 +490,55 @@ static int kvmppc_e500_tlb_index(struct kvmppc_vcpu_e500 *vcpu_e500, return -1; } -static inline void kvmppc_e500_priv_setup(struct tlbe_priv *priv, - struct tlbe *gtlbe, - pfn_t pfn) +static inline void kvmppc_e500_ref_setup(struct tlbe_ref *ref, + struct tlbe *gtlbe, + pfn_t pfn) { - priv->pfn = pfn; - priv->flags = E500_TLB_VALID; + ref->pfn = pfn; + ref->flags = E500_TLB_VALID; if (tlbe_is_writable(gtlbe)) - priv->flags |= E500_TLB_DIRTY; + ref->flags |= E500_TLB_DIRTY; } -static inline void kvmppc_e500_priv_release(struct tlbe_priv *priv) +static inline void kvmppc_e500_ref_release(struct tlbe_ref *ref) { - if (priv->flags & E500_TLB_VALID) { - if (priv->flags & E500_TLB_DIRTY) - kvm_release_pfn_dirty(priv->pfn); + if (ref->flags & E500_TLB_VALID) { + if (ref->flags & E500_TLB_DIRTY) + kvm_release_pfn_dirty(ref->pfn); else - kvm_release_pfn_clean(priv->pfn); + kvm_release_pfn_clean(ref->pfn); + + ref->flags = 0; + } +} + +static void clear_tlb_privs(struct kvmppc_vcpu_e500 *vcpu_e500) +{ + int tlbsel = 0; + int i; - priv->flags = 0; + for (i = 0; i < vcpu_e500->gtlb_size[tlbsel]; i++) { + struct tlbe_ref *ref = + &vcpu_e500->gtlb_priv[tlbsel][i].ref; + kvmppc_e500_ref_release(ref); } } +static void clear_tlb_refs(struct kvmppc_vcpu_e500 *vcpu_e500) +{ + int stlbsel = 1; + int i; + + for (i = 0; i < host_tlb_params[stlbsel].entries; i++) { + struct tlbe_ref *ref = + &vcpu_e500->tlb_refs[stlbsel][i]; + kvmppc_e500_ref_release(ref); + } + + clear_tlb_privs(vcpu_e500); +} + static inline void kvmppc_e500_deliver_tlb_miss(struct kvm_vcpu *vcpu, unsigned int eaddr, int as) { @@ -487,7 +548,7 @@ static inline void kvmppc_e500_deliver_tlb_miss(struct kvm_vcpu *vcpu, /* since we only have two TLBs, only lower bit is used. */ tlbsel = (vcpu_e500->mas4 >> 28) & 0x1; - victim = (tlbsel == 0) ? tlb0_get_next_victim(vcpu_e500) : 0; + victim = (tlbsel == 0) ? gtlb0_get_next_victim(vcpu_e500) : 0; pidsel = (vcpu_e500->mas4 >> 16) & 0xf; tsized = (vcpu_e500->mas4 >> 7) & 0x1f; @@ -508,10 +569,12 @@ static inline void kvmppc_e500_deliver_tlb_miss(struct kvm_vcpu *vcpu, /* TID must be supplied by the caller */ static inline void kvmppc_e500_setup_stlbe(struct kvmppc_vcpu_e500 *vcpu_e500, struct tlbe *gtlbe, int tsize, - struct tlbe_priv *priv, + struct tlbe_ref *ref, u64 gvaddr, struct tlbe *stlbe) { - pfn_t pfn = priv->pfn; + pfn_t pfn = ref->pfn; + + BUG_ON(!(ref->flags & E500_TLB_VALID)); /* Force TS=1 IPROT=0 for all guest mappings. */ stlbe->mas1 = MAS1_TSIZE(tsize) | MAS1_TS | MAS1_VALID; @@ -524,16 +587,15 @@ static inline void kvmppc_e500_setup_stlbe(struct kvmppc_vcpu_e500 *vcpu_e500, stlbe->mas7 = (pfn >> (32 - PAGE_SHIFT)) & MAS7_RPN; } - +/* sesel is an index into the entire array, not just the set */ static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500, - u64 gvaddr, gfn_t gfn, struct tlbe *gtlbe, int tlbsel, int esel, - struct tlbe *stlbe) + u64 gvaddr, gfn_t gfn, struct tlbe *gtlbe, int tlbsel, int sesel, + struct tlbe *stlbe, struct tlbe_ref *ref) { struct kvm_memory_slot *slot; unsigned long pfn, hva; int pfnmap = 0; int tsize = BOOK3E_PAGESZ_4K; - struct tlbe_priv *priv; /* * Translate guest physical to true physical, acquiring @@ -629,12 +691,11 @@ static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500, } } - /* Drop old priv and setup new one. */ - priv = &vcpu_e500->gtlb_priv[tlbsel][esel]; - kvmppc_e500_priv_release(priv); - kvmppc_e500_priv_setup(priv, gtlbe, pfn); + /* Drop old ref and setup new one. */ + kvmppc_e500_ref_release(ref); + kvmppc_e500_ref_setup(ref, gtlbe, pfn); - kvmppc_e500_setup_stlbe(vcpu_e500, gtlbe, tsize, priv, gvaddr, stlbe); + kvmppc_e500_setup_stlbe(vcpu_e500, gtlbe, tsize, ref, gvaddr, stlbe); } /* XXX only map the one-one case, for now use TLB0 */ @@ -642,14 +703,22 @@ static int kvmppc_e500_tlb0_map(struct kvmppc_vcpu_e500 *vcpu_e500, int esel, struct tlbe *stlbe) { struct tlbe *gtlbe; + struct tlbe_ref *ref; + int sesel = esel & (host_tlb_params[0].ways - 1); + int sesel_base; + gva_t ea; gtlbe = &vcpu_e500->gtlb_arch[0][esel]; + ref = &vcpu_e500->gtlb_priv[0][esel].ref; + + ea = get_tlb_eaddr(gtlbe); + sesel_base = htlb0_set_base(ea); kvmppc_e500_shadow_map(vcpu_e500, get_tlb_eaddr(gtlbe), get_tlb_raddr(gtlbe) >> PAGE_SHIFT, - gtlbe, 0, esel, stlbe); + gtlbe, 0, sesel_base + sesel, stlbe, ref); - return esel; + return sesel; } /* Caller must ensure that the specified guest TLB entry is safe to insert into @@ -658,14 +727,17 @@ static int kvmppc_e500_tlb0_map(struct kvmppc_vcpu_e500 *vcpu_e500, static int kvmppc_e500_tlb1_map(struct kvmppc_vcpu_e500 *vcpu_e500, u64 gvaddr, gfn_t gfn, struct tlbe *gtlbe, struct tlbe *stlbe) { + struct tlbe_ref *ref; unsigned int victim; - victim = vcpu_e500->gtlb_nv[1]++; + victim = vcpu_e500->host_tlb1_nv++; - if (unlikely(vcpu_e500->gtlb_nv[1] >= tlb1_max_shadow_size())) - vcpu_e500->gtlb_nv[1] = 0; + if (unlikely(vcpu_e500->host_tlb1_nv >= tlb1_max_shadow_size())) + vcpu_e500->host_tlb1_nv = 0; - kvmppc_e500_shadow_map(vcpu_e500, gvaddr, gfn, gtlbe, 1, victim, stlbe); + ref = &vcpu_e500->tlb_refs[1][victim]; + kvmppc_e500_shadow_map(vcpu_e500, gvaddr, gfn, gtlbe, 1, + victim, stlbe, ref); return victim; } @@ -792,7 +864,7 @@ int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, int rb) /* since we only have two TLBs, only lower bit is used. */ tlbsel = vcpu_e500->mas4 >> 28 & 0x1; - victim = (tlbsel == 0) ? tlb0_get_next_victim(vcpu_e500) : 0; + victim = (tlbsel == 0) ? gtlb0_get_next_victim(vcpu_e500) : 0; vcpu_e500->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(victim) | MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]); @@ -839,7 +911,7 @@ int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu) gtlbe = &vcpu_e500->gtlb_arch[tlbsel][esel]; if (get_tlb_v(gtlbe)) - kvmppc_e500_stlbe_invalidate(vcpu_e500, tlbsel, esel); + inval_gtlbe_on_host(vcpu_e500, tlbsel, esel); gtlbe->mas1 = vcpu_e500->mas1; gtlbe->mas2 = vcpu_e500->mas2; @@ -950,11 +1022,11 @@ void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 eaddr, gpa_t gpaddr, switch (tlbsel) { case 0: stlbsel = 0; - sesel = esel; - priv = &vcpu_e500->gtlb_priv[stlbsel][sesel]; + sesel = esel & (host_tlb_params[0].ways - 1); + priv = &vcpu_e500->gtlb_priv[tlbsel][esel]; kvmppc_e500_setup_stlbe(vcpu_e500, gtlbe, BOOK3E_PAGESZ_4K, - priv, eaddr, &stlbe); + &priv->ref, eaddr, &stlbe); break; case 1: { @@ -1020,32 +1092,76 @@ void kvmppc_e500_tlb_setup(struct kvmppc_vcpu_e500 *vcpu_e500) int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500) { - tlb1_entry_num = mfspr(SPRN_TLB1CFG) & 0xFFF; + host_tlb_params[0].entries = mfspr(SPRN_TLB0CFG) & TLBnCFG_N_ENTRY; + host_tlb_params[1].entries = mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY; + + /* + * This should never happen on real e500 hardware, but is + * architecturally possible -- e.g. in some weird nested + * virtualization case. + */ + if (host_tlb_params[0].entries == 0 || + host_tlb_params[1].entries == 0) { + pr_err("%s: need to know host tlb size\n", __func__); + return -ENODEV; + } + + host_tlb_params[0].ways = (mfspr(SPRN_TLB0CFG) & TLBnCFG_ASSOC) >> + TLBnCFG_ASSOC_SHIFT; + host_tlb_params[1].ways = host_tlb_params[1].entries; + + if (!is_power_of_2(host_tlb_params[0].entries) || + !is_power_of_2(host_tlb_params[0].ways) || + host_tlb_params[0].entries < host_tlb_params[0].ways || + host_tlb_params[0].ways == 0) { + pr_err("%s: bad tlb0 host config: %u entries %u ways\n", + __func__, host_tlb_params[0].entries, + host_tlb_params[0].ways); + return -ENODEV; + } + + host_tlb_params[0].sets = + host_tlb_params[0].entries / host_tlb_params[0].ways; + host_tlb_params[1].sets = 1; vcpu_e500->gtlb_size[0] = KVM_E500_TLB0_SIZE; vcpu_e500->gtlb_arch[0] = kzalloc(sizeof(struct tlbe) * KVM_E500_TLB0_SIZE, GFP_KERNEL); if (vcpu_e500->gtlb_arch[0] == NULL) - goto err_out; + goto err; vcpu_e500->gtlb_size[1] = KVM_E500_TLB1_SIZE; vcpu_e500->gtlb_arch[1] = kzalloc(sizeof(struct tlbe) * KVM_E500_TLB1_SIZE, GFP_KERNEL); if (vcpu_e500->gtlb_arch[1] == NULL) - goto err_out_guest0; - - vcpu_e500->gtlb_priv[0] = (struct tlbe_priv *) - kzalloc(sizeof(struct tlbe_priv) * KVM_E500_TLB0_SIZE, GFP_KERNEL); - if (vcpu_e500->gtlb_priv[0] == NULL) - goto err_out_guest1; - vcpu_e500->gtlb_priv[1] = (struct tlbe_priv *) - kzalloc(sizeof(struct tlbe_priv) * KVM_E500_TLB1_SIZE, GFP_KERNEL); - - if (vcpu_e500->gtlb_priv[1] == NULL) - goto err_out_priv0; + goto err; + + vcpu_e500->tlb_refs[0] = + kzalloc(sizeof(struct tlbe_ref) * host_tlb_params[0].entries, + GFP_KERNEL); + if (!vcpu_e500->tlb_refs[0]) + goto err; + + vcpu_e500->tlb_refs[1] = + kzalloc(sizeof(struct tlbe_ref) * host_tlb_params[1].entries, + GFP_KERNEL); + if (!vcpu_e500->tlb_refs[1]) + goto err; + + vcpu_e500->gtlb_priv[0] = + kzalloc(sizeof(struct tlbe_ref) * vcpu_e500->gtlb_size[0], + GFP_KERNEL); + if (!vcpu_e500->gtlb_priv[0]) + goto err; + + vcpu_e500->gtlb_priv[1] = + kzalloc(sizeof(struct tlbe_ref) * vcpu_e500->gtlb_size[1], + GFP_KERNEL); + if (!vcpu_e500->gtlb_priv[1]) + goto err; if (kvmppc_e500_id_table_alloc(vcpu_e500) == NULL) - goto err_out_priv1; + goto err; /* Init TLB configuration register */ vcpu_e500->tlb0cfg = mfspr(SPRN_TLB0CFG) & ~0xfffUL; @@ -1055,31 +1171,26 @@ int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500) return 0; -err_out_priv1: - kfree(vcpu_e500->gtlb_priv[1]); -err_out_priv0: +err: + kfree(vcpu_e500->tlb_refs[0]); + kfree(vcpu_e500->tlb_refs[1]); kfree(vcpu_e500->gtlb_priv[0]); -err_out_guest1: - kfree(vcpu_e500->gtlb_arch[1]); -err_out_guest0: + kfree(vcpu_e500->gtlb_priv[1]); kfree(vcpu_e500->gtlb_arch[0]); -err_out: + kfree(vcpu_e500->gtlb_arch[1]); return -1; } void kvmppc_e500_tlb_uninit(struct kvmppc_vcpu_e500 *vcpu_e500) { - int stlbsel, i; - - /* release all privs */ - for (stlbsel = 0; stlbsel < 2; stlbsel++) - for (i = 0; i < vcpu_e500->gtlb_size[stlbsel]; i++) { - struct tlbe_priv *priv = - &vcpu_e500->gtlb_priv[stlbsel][i]; - kvmppc_e500_priv_release(priv); - } + clear_tlb_refs(vcpu_e500); kvmppc_e500_id_table_free(vcpu_e500); + + kfree(vcpu_e500->tlb_refs[0]); + kfree(vcpu_e500->tlb_refs[1]); + kfree(vcpu_e500->gtlb_priv[0]); + kfree(vcpu_e500->gtlb_priv[1]); kfree(vcpu_e500->gtlb_arch[1]); kfree(vcpu_e500->gtlb_arch[0]); } diff --git a/arch/powerpc/kvm/e500_tlb.h b/arch/powerpc/kvm/e500_tlb.h index 59b88e99a23..b587f691459 100644 --- a/arch/powerpc/kvm/e500_tlb.h +++ b/arch/powerpc/kvm/e500_tlb.h @@ -155,23 +155,6 @@ static inline unsigned int get_tlb_esel_bit( return (vcpu_e500->mas0 >> 16) & 0xfff; } -static inline unsigned int get_tlb_esel( - const struct kvmppc_vcpu_e500 *vcpu_e500, - int tlbsel) -{ - unsigned int esel = get_tlb_esel_bit(vcpu_e500); - - if (tlbsel == 0) { - esel &= KVM_E500_TLB0_WAY_NUM_MASK; - esel |= ((vcpu_e500->mas2 >> 12) & KVM_E500_TLB0_WAY_SIZE_MASK) - << KVM_E500_TLB0_WAY_NUM_BIT; - } else { - esel &= KVM_E500_TLB1_SIZE - 1; - } - - return esel; -} - static inline int tlbe_is_host_safe(const struct kvm_vcpu *vcpu, const struct tlbe *tlbe) { -- cgit v1.2.3 From dc83b8bc0256ee682506ed83853a98eaba529c6f Mon Sep 17 00:00:00 2001 From: Scott Wood Date: Thu, 18 Aug 2011 15:25:21 -0500 Subject: KVM: PPC: e500: MMU API This implements a shared-memory API for giving host userspace access to the guest's TLB. Signed-off-by: Scott Wood Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm.h | 35 ++++ arch/powerpc/include/asm/kvm_e500.h | 24 +-- arch/powerpc/include/asm/kvm_ppc.h | 5 + arch/powerpc/kvm/e500.c | 5 +- arch/powerpc/kvm/e500_emulate.c | 12 +- arch/powerpc/kvm/e500_tlb.c | 393 ++++++++++++++++++++++++------------ arch/powerpc/kvm/e500_tlb.h | 38 ++-- arch/powerpc/kvm/powerpc.c | 28 +++ 8 files changed, 377 insertions(+), 163 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm.h b/arch/powerpc/include/asm/kvm.h index 7d9d4de057e..663c57f8716 100644 --- a/arch/powerpc/include/asm/kvm.h +++ b/arch/powerpc/include/asm/kvm.h @@ -296,4 +296,39 @@ struct kvm_allocate_rma { __u64 rma_size; }; +struct kvm_book3e_206_tlb_entry { + __u32 mas8; + __u32 mas1; + __u64 mas2; + __u64 mas7_3; +}; + +struct kvm_book3e_206_tlb_params { + /* + * For mmu types KVM_MMU_FSL_BOOKE_NOHV and KVM_MMU_FSL_BOOKE_HV: + * + * - The number of ways of TLB0 must be a power of two between 2 and + * 16. + * - TLB1 must be fully associative. + * - The size of TLB0 must be a multiple of the number of ways, and + * the number of sets must be a power of two. + * - The size of TLB1 may not exceed 64 entries. + * - TLB0 supports 4 KiB pages. + * - The page sizes supported by TLB1 are as indicated by + * TLB1CFG (if MMUCFG[MAVN] = 0) or TLB1PS (if MMUCFG[MAVN] = 1) + * as returned by KVM_GET_SREGS. + * - TLB2 and TLB3 are reserved, and their entries in tlb_sizes[] + * and tlb_ways[] must be zero. + * + * tlb_ways[n] = tlb_sizes[n] means the array is fully associative. + * + * KVM will adjust TLBnCFG based on the sizes configured here, + * though arrays greater than 2048 entries will have TLBnCFG[NENTRY] + * set to zero. + */ + __u32 tlb_sizes[4]; + __u32 tlb_ways[4]; + __u32 reserved[8]; +}; + #endif /* __LINUX_KVM_POWERPC_H */ diff --git a/arch/powerpc/include/asm/kvm_e500.h b/arch/powerpc/include/asm/kvm_e500.h index a5197d816ec..bc17441535f 100644 --- a/arch/powerpc/include/asm/kvm_e500.h +++ b/arch/powerpc/include/asm/kvm_e500.h @@ -22,13 +22,6 @@ #define E500_PID_NUM 3 #define E500_TLB_NUM 2 -struct tlbe{ - u32 mas1; - u32 mas2; - u32 mas3; - u32 mas7; -}; - #define E500_TLB_VALID 1 #define E500_TLB_DIRTY 2 @@ -48,13 +41,17 @@ struct kvmppc_e500_tlb_params { }; struct kvmppc_vcpu_e500 { - /* Unmodified copy of the guest's TLB. */ - struct tlbe *gtlb_arch[E500_TLB_NUM]; + /* Unmodified copy of the guest's TLB -- shared with host userspace. */ + struct kvm_book3e_206_tlb_entry *gtlb_arch; + + /* Starting entry number in gtlb_arch[] */ + int gtlb_offset[E500_TLB_NUM]; /* KVM internal information associated with each guest TLB entry */ struct tlbe_priv *gtlb_priv[E500_TLB_NUM]; - unsigned int gtlb_size[E500_TLB_NUM]; + struct kvmppc_e500_tlb_params gtlb_params[E500_TLB_NUM]; + unsigned int gtlb_nv[E500_TLB_NUM]; /* @@ -68,7 +65,6 @@ struct kvmppc_vcpu_e500 { * and back, and our host TLB entries got evicted). */ struct tlbe_ref *tlb_refs[E500_TLB_NUM]; - unsigned int host_tlb1_nv; u32 host_pid[E500_PID_NUM]; @@ -78,11 +74,10 @@ struct kvmppc_vcpu_e500 { u32 mas0; u32 mas1; u32 mas2; - u32 mas3; + u64 mas7_3; u32 mas4; u32 mas5; u32 mas6; - u32 mas7; /* vcpu id table */ struct vcpu_id_table *idt; @@ -95,6 +90,9 @@ struct kvmppc_vcpu_e500 { u32 tlb1cfg; u64 mcar; + struct page **shared_tlb_pages; + int num_shared_tlb_pages; + struct kvm_vcpu vcpu; }; diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h index 46efd1a265c..a284f209e2d 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -193,4 +193,9 @@ static inline void kvm_rma_init(void) {} #endif +int kvm_vcpu_ioctl_config_tlb(struct kvm_vcpu *vcpu, + struct kvm_config_tlb *cfg); +int kvm_vcpu_ioctl_dirty_tlb(struct kvm_vcpu *vcpu, + struct kvm_dirty_tlb *cfg); + #endif /* __POWERPC_KVM_PPC_H__ */ diff --git a/arch/powerpc/kvm/e500.c b/arch/powerpc/kvm/e500.c index 8c0d45a6faf..f17d7e732a1 100644 --- a/arch/powerpc/kvm/e500.c +++ b/arch/powerpc/kvm/e500.c @@ -121,7 +121,7 @@ void kvmppc_core_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) sregs->u.e.mas0 = vcpu_e500->mas0; sregs->u.e.mas1 = vcpu_e500->mas1; sregs->u.e.mas2 = vcpu_e500->mas2; - sregs->u.e.mas7_3 = ((u64)vcpu_e500->mas7 << 32) | vcpu_e500->mas3; + sregs->u.e.mas7_3 = vcpu_e500->mas7_3; sregs->u.e.mas4 = vcpu_e500->mas4; sregs->u.e.mas6 = vcpu_e500->mas6; @@ -154,8 +154,7 @@ int kvmppc_core_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) vcpu_e500->mas0 = sregs->u.e.mas0; vcpu_e500->mas1 = sregs->u.e.mas1; vcpu_e500->mas2 = sregs->u.e.mas2; - vcpu_e500->mas7 = sregs->u.e.mas7_3 >> 32; - vcpu_e500->mas3 = (u32)sregs->u.e.mas7_3; + vcpu_e500->mas7_3 = sregs->u.e.mas7_3; vcpu_e500->mas4 = sregs->u.e.mas4; vcpu_e500->mas6 = sregs->u.e.mas6; } diff --git a/arch/powerpc/kvm/e500_emulate.c b/arch/powerpc/kvm/e500_emulate.c index d48ae396f41..e0d36099c75 100644 --- a/arch/powerpc/kvm/e500_emulate.c +++ b/arch/powerpc/kvm/e500_emulate.c @@ -95,13 +95,17 @@ int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs) case SPRN_MAS2: vcpu_e500->mas2 = spr_val; break; case SPRN_MAS3: - vcpu_e500->mas3 = spr_val; break; + vcpu_e500->mas7_3 &= ~(u64)0xffffffff; + vcpu_e500->mas7_3 |= spr_val; + break; case SPRN_MAS4: vcpu_e500->mas4 = spr_val; break; case SPRN_MAS6: vcpu_e500->mas6 = spr_val; break; case SPRN_MAS7: - vcpu_e500->mas7 = spr_val; break; + vcpu_e500->mas7_3 &= (u64)0xffffffff; + vcpu_e500->mas7_3 |= (u64)spr_val << 32; + break; case SPRN_L1CSR0: vcpu_e500->l1csr0 = spr_val; vcpu_e500->l1csr0 &= ~(L1CSR0_DCFI | L1CSR0_CLFC); @@ -158,13 +162,13 @@ int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt) case SPRN_MAS2: kvmppc_set_gpr(vcpu, rt, vcpu_e500->mas2); break; case SPRN_MAS3: - kvmppc_set_gpr(vcpu, rt, vcpu_e500->mas3); break; + kvmppc_set_gpr(vcpu, rt, (u32)vcpu_e500->mas7_3); break; case SPRN_MAS4: kvmppc_set_gpr(vcpu, rt, vcpu_e500->mas4); break; case SPRN_MAS6: kvmppc_set_gpr(vcpu, rt, vcpu_e500->mas6); break; case SPRN_MAS7: - kvmppc_set_gpr(vcpu, rt, vcpu_e500->mas7); break; + kvmppc_set_gpr(vcpu, rt, vcpu_e500->mas7_3 >> 32); break; case SPRN_TLB0CFG: kvmppc_set_gpr(vcpu, rt, vcpu_e500->tlb0cfg); break; diff --git a/arch/powerpc/kvm/e500_tlb.c b/arch/powerpc/kvm/e500_tlb.c index 59221bb1e00..f19ae2f6152 100644 --- a/arch/powerpc/kvm/e500_tlb.c +++ b/arch/powerpc/kvm/e500_tlb.c @@ -19,6 +19,11 @@ #include #include #include +#include +#include +#include +#include +#include #include #include @@ -66,6 +71,13 @@ static DEFINE_PER_CPU(unsigned long, pcpu_last_used_sid); static struct kvmppc_e500_tlb_params host_tlb_params[E500_TLB_NUM]; +static struct kvm_book3e_206_tlb_entry *get_entry( + struct kvmppc_vcpu_e500 *vcpu_e500, int tlbsel, int entry) +{ + int offset = vcpu_e500->gtlb_offset[tlbsel]; + return &vcpu_e500->gtlb_arch[offset + entry]; +} + /* * Allocate a free shadow id and setup a valid sid mapping in given entry. * A mapping is only valid when vcpu_id_table and pcpu_id_table are match. @@ -217,34 +229,13 @@ void kvmppc_e500_recalc_shadow_pid(struct kvmppc_vcpu_e500 *vcpu_e500) preempt_enable(); } -void kvmppc_dump_tlbs(struct kvm_vcpu *vcpu) -{ - struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu); - struct tlbe *tlbe; - int i, tlbsel; - - printk("| %8s | %8s | %8s | %8s | %8s |\n", - "nr", "mas1", "mas2", "mas3", "mas7"); - - for (tlbsel = 0; tlbsel < 2; tlbsel++) { - printk("Guest TLB%d:\n", tlbsel); - for (i = 0; i < vcpu_e500->gtlb_size[tlbsel]; i++) { - tlbe = &vcpu_e500->gtlb_arch[tlbsel][i]; - if (tlbe->mas1 & MAS1_VALID) - printk(" G[%d][%3d] | %08X | %08X | %08X | %08X |\n", - tlbsel, i, tlbe->mas1, tlbe->mas2, - tlbe->mas3, tlbe->mas7); - } - } -} - static inline unsigned int gtlb0_get_next_victim( struct kvmppc_vcpu_e500 *vcpu_e500) { unsigned int victim; victim = vcpu_e500->gtlb_nv[0]++; - if (unlikely(vcpu_e500->gtlb_nv[0] >= KVM_E500_TLB0_WAY_NUM)) + if (unlikely(vcpu_e500->gtlb_nv[0] >= vcpu_e500->gtlb_params[0].ways)) vcpu_e500->gtlb_nv[0] = 0; return victim; @@ -256,9 +247,9 @@ static inline unsigned int tlb1_max_shadow_size(void) return host_tlb_params[1].entries - tlbcam_index - 1; } -static inline int tlbe_is_writable(struct tlbe *tlbe) +static inline int tlbe_is_writable(struct kvm_book3e_206_tlb_entry *tlbe) { - return tlbe->mas3 & (MAS3_SW|MAS3_UW); + return tlbe->mas7_3 & (MAS3_SW|MAS3_UW); } static inline u32 e500_shadow_mas3_attrib(u32 mas3, int usermode) @@ -289,39 +280,41 @@ static inline u32 e500_shadow_mas2_attrib(u32 mas2, int usermode) /* * writing shadow tlb entry to host TLB */ -static inline void __write_host_tlbe(struct tlbe *stlbe, uint32_t mas0) +static inline void __write_host_tlbe(struct kvm_book3e_206_tlb_entry *stlbe, + uint32_t mas0) { unsigned long flags; local_irq_save(flags); mtspr(SPRN_MAS0, mas0); mtspr(SPRN_MAS1, stlbe->mas1); - mtspr(SPRN_MAS2, stlbe->mas2); - mtspr(SPRN_MAS3, stlbe->mas3); - mtspr(SPRN_MAS7, stlbe->mas7); + mtspr(SPRN_MAS2, (unsigned long)stlbe->mas2); + mtspr(SPRN_MAS3, (u32)stlbe->mas7_3); + mtspr(SPRN_MAS7, (u32)(stlbe->mas7_3 >> 32)); asm volatile("isync; tlbwe" : : : "memory"); local_irq_restore(flags); } /* esel is index into set, not whole array */ static inline void write_host_tlbe(struct kvmppc_vcpu_e500 *vcpu_e500, - int tlbsel, int esel, struct tlbe *stlbe) + int tlbsel, int esel, struct kvm_book3e_206_tlb_entry *stlbe) { if (tlbsel == 0) { - __write_host_tlbe(stlbe, MAS0_TLBSEL(0) | MAS0_ESEL(esel)); + int way = esel & (vcpu_e500->gtlb_params[0].ways - 1); + __write_host_tlbe(stlbe, MAS0_TLBSEL(0) | MAS0_ESEL(way)); } else { __write_host_tlbe(stlbe, MAS0_TLBSEL(1) | MAS0_ESEL(to_htlb1_esel(esel))); } trace_kvm_stlb_write(index_of(tlbsel, esel), stlbe->mas1, stlbe->mas2, - stlbe->mas3, stlbe->mas7); + (u32)stlbe->mas7_3, (u32)(stlbe->mas7_3 >> 32)); } void kvmppc_map_magic(struct kvm_vcpu *vcpu) { struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu); - struct tlbe magic; + struct kvm_book3e_206_tlb_entry magic; ulong shared_page = ((ulong)vcpu->arch.shared) & PAGE_MASK; unsigned int stid; pfn_t pfn; @@ -335,9 +328,8 @@ void kvmppc_map_magic(struct kvm_vcpu *vcpu) magic.mas1 = MAS1_VALID | MAS1_TS | MAS1_TID(stid) | MAS1_TSIZE(BOOK3E_PAGESZ_4K); magic.mas2 = vcpu->arch.magic_page_ea | MAS2_M; - magic.mas3 = (pfn << PAGE_SHIFT) | - MAS3_SW | MAS3_SR | MAS3_UW | MAS3_UR; - magic.mas7 = pfn >> (32 - PAGE_SHIFT); + magic.mas7_3 = ((u64)pfn << PAGE_SHIFT) | + MAS3_SW | MAS3_SR | MAS3_UW | MAS3_UR; __write_host_tlbe(&magic, MAS0_TLBSEL(1) | MAS0_ESEL(tlbcam_index)); preempt_enable(); @@ -358,7 +350,8 @@ void kvmppc_e500_tlb_put(struct kvm_vcpu *vcpu) static void inval_gtlbe_on_host(struct kvmppc_vcpu_e500 *vcpu_e500, int tlbsel, int esel) { - struct tlbe *gtlbe = &vcpu_e500->gtlb_arch[tlbsel][esel]; + struct kvm_book3e_206_tlb_entry *gtlbe = + get_entry(vcpu_e500, tlbsel, esel); struct vcpu_id_table *idt = vcpu_e500->idt; unsigned int pr, tid, ts, pid; u32 val, eaddr; @@ -424,9 +417,8 @@ static int tlb0_set_base(gva_t addr, int sets, int ways) static int gtlb0_set_base(struct kvmppc_vcpu_e500 *vcpu_e500, gva_t addr) { - int sets = KVM_E500_TLB0_SIZE / KVM_E500_TLB0_WAY_NUM; - - return tlb0_set_base(addr, sets, KVM_E500_TLB0_WAY_NUM); + return tlb0_set_base(addr, vcpu_e500->gtlb_params[0].sets, + vcpu_e500->gtlb_params[0].ways); } static int htlb0_set_base(gva_t addr) @@ -440,10 +432,10 @@ static unsigned int get_tlb_esel(struct kvmppc_vcpu_e500 *vcpu_e500, int tlbsel) unsigned int esel = get_tlb_esel_bit(vcpu_e500); if (tlbsel == 0) { - esel &= KVM_E500_TLB0_WAY_NUM_MASK; + esel &= vcpu_e500->gtlb_params[0].ways - 1; esel += gtlb0_set_base(vcpu_e500, vcpu_e500->mas2); } else { - esel &= vcpu_e500->gtlb_size[tlbsel] - 1; + esel &= vcpu_e500->gtlb_params[tlbsel].entries - 1; } return esel; @@ -453,19 +445,22 @@ static unsigned int get_tlb_esel(struct kvmppc_vcpu_e500 *vcpu_e500, int tlbsel) static int kvmppc_e500_tlb_index(struct kvmppc_vcpu_e500 *vcpu_e500, gva_t eaddr, int tlbsel, unsigned int pid, int as) { - int size = vcpu_e500->gtlb_size[tlbsel]; - unsigned int set_base; + int size = vcpu_e500->gtlb_params[tlbsel].entries; + unsigned int set_base, offset; int i; if (tlbsel == 0) { set_base = gtlb0_set_base(vcpu_e500, eaddr); - size = KVM_E500_TLB0_WAY_NUM; + size = vcpu_e500->gtlb_params[0].ways; } else { set_base = 0; } + offset = vcpu_e500->gtlb_offset[tlbsel]; + for (i = 0; i < size; i++) { - struct tlbe *tlbe = &vcpu_e500->gtlb_arch[tlbsel][set_base + i]; + struct kvm_book3e_206_tlb_entry *tlbe = + &vcpu_e500->gtlb_arch[offset + set_base + i]; unsigned int tid; if (eaddr < get_tlb_eaddr(tlbe)) @@ -491,7 +486,7 @@ static int kvmppc_e500_tlb_index(struct kvmppc_vcpu_e500 *vcpu_e500, } static inline void kvmppc_e500_ref_setup(struct tlbe_ref *ref, - struct tlbe *gtlbe, + struct kvm_book3e_206_tlb_entry *gtlbe, pfn_t pfn) { ref->pfn = pfn; @@ -518,7 +513,7 @@ static void clear_tlb_privs(struct kvmppc_vcpu_e500 *vcpu_e500) int tlbsel = 0; int i; - for (i = 0; i < vcpu_e500->gtlb_size[tlbsel]; i++) { + for (i = 0; i < vcpu_e500->gtlb_params[tlbsel].entries; i++) { struct tlbe_ref *ref = &vcpu_e500->gtlb_priv[tlbsel][i].ref; kvmppc_e500_ref_release(ref); @@ -530,6 +525,8 @@ static void clear_tlb_refs(struct kvmppc_vcpu_e500 *vcpu_e500) int stlbsel = 1; int i; + kvmppc_e500_id_table_reset_all(vcpu_e500); + for (i = 0; i < host_tlb_params[stlbsel].entries; i++) { struct tlbe_ref *ref = &vcpu_e500->tlb_refs[stlbsel][i]; @@ -559,18 +556,18 @@ static inline void kvmppc_e500_deliver_tlb_miss(struct kvm_vcpu *vcpu, | MAS1_TSIZE(tsized); vcpu_e500->mas2 = (eaddr & MAS2_EPN) | (vcpu_e500->mas4 & MAS2_ATTRIB_MASK); - vcpu_e500->mas3 &= MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3; + vcpu_e500->mas7_3 &= MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3; vcpu_e500->mas6 = (vcpu_e500->mas6 & MAS6_SPID1) | (get_cur_pid(vcpu) << 16) | (as ? MAS6_SAS : 0); - vcpu_e500->mas7 = 0; } /* TID must be supplied by the caller */ -static inline void kvmppc_e500_setup_stlbe(struct kvmppc_vcpu_e500 *vcpu_e500, - struct tlbe *gtlbe, int tsize, - struct tlbe_ref *ref, - u64 gvaddr, struct tlbe *stlbe) +static inline void kvmppc_e500_setup_stlbe( + struct kvmppc_vcpu_e500 *vcpu_e500, + struct kvm_book3e_206_tlb_entry *gtlbe, + int tsize, struct tlbe_ref *ref, u64 gvaddr, + struct kvm_book3e_206_tlb_entry *stlbe) { pfn_t pfn = ref->pfn; @@ -581,16 +578,16 @@ static inline void kvmppc_e500_setup_stlbe(struct kvmppc_vcpu_e500 *vcpu_e500, stlbe->mas2 = (gvaddr & MAS2_EPN) | e500_shadow_mas2_attrib(gtlbe->mas2, vcpu_e500->vcpu.arch.shared->msr & MSR_PR); - stlbe->mas3 = ((pfn << PAGE_SHIFT) & MAS3_RPN) - | e500_shadow_mas3_attrib(gtlbe->mas3, + stlbe->mas7_3 = ((u64)pfn << PAGE_SHIFT) + | e500_shadow_mas3_attrib(gtlbe->mas7_3, vcpu_e500->vcpu.arch.shared->msr & MSR_PR); - stlbe->mas7 = (pfn >> (32 - PAGE_SHIFT)) & MAS7_RPN; } /* sesel is an index into the entire array, not just the set */ static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500, - u64 gvaddr, gfn_t gfn, struct tlbe *gtlbe, int tlbsel, int sesel, - struct tlbe *stlbe, struct tlbe_ref *ref) + u64 gvaddr, gfn_t gfn, struct kvm_book3e_206_tlb_entry *gtlbe, + int tlbsel, int sesel, struct kvm_book3e_206_tlb_entry *stlbe, + struct tlbe_ref *ref) { struct kvm_memory_slot *slot; unsigned long pfn, hva; @@ -700,15 +697,16 @@ static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500, /* XXX only map the one-one case, for now use TLB0 */ static int kvmppc_e500_tlb0_map(struct kvmppc_vcpu_e500 *vcpu_e500, - int esel, struct tlbe *stlbe) + int esel, + struct kvm_book3e_206_tlb_entry *stlbe) { - struct tlbe *gtlbe; + struct kvm_book3e_206_tlb_entry *gtlbe; struct tlbe_ref *ref; int sesel = esel & (host_tlb_params[0].ways - 1); int sesel_base; gva_t ea; - gtlbe = &vcpu_e500->gtlb_arch[0][esel]; + gtlbe = get_entry(vcpu_e500, 0, esel); ref = &vcpu_e500->gtlb_priv[0][esel].ref; ea = get_tlb_eaddr(gtlbe); @@ -725,7 +723,8 @@ static int kvmppc_e500_tlb0_map(struct kvmppc_vcpu_e500 *vcpu_e500, * the shadow TLB. */ /* XXX for both one-one and one-to-many , for now use TLB1 */ static int kvmppc_e500_tlb1_map(struct kvmppc_vcpu_e500 *vcpu_e500, - u64 gvaddr, gfn_t gfn, struct tlbe *gtlbe, struct tlbe *stlbe) + u64 gvaddr, gfn_t gfn, struct kvm_book3e_206_tlb_entry *gtlbe, + struct kvm_book3e_206_tlb_entry *stlbe) { struct tlbe_ref *ref; unsigned int victim; @@ -754,7 +753,8 @@ static inline int kvmppc_e500_gtlbe_invalidate( struct kvmppc_vcpu_e500 *vcpu_e500, int tlbsel, int esel) { - struct tlbe *gtlbe = &vcpu_e500->gtlb_arch[tlbsel][esel]; + struct kvm_book3e_206_tlb_entry *gtlbe = + get_entry(vcpu_e500, tlbsel, esel); if (unlikely(get_tlb_iprot(gtlbe))) return -1; @@ -769,10 +769,10 @@ int kvmppc_e500_emul_mt_mmucsr0(struct kvmppc_vcpu_e500 *vcpu_e500, ulong value) int esel; if (value & MMUCSR0_TLB0FI) - for (esel = 0; esel < vcpu_e500->gtlb_size[0]; esel++) + for (esel = 0; esel < vcpu_e500->gtlb_params[0].entries; esel++) kvmppc_e500_gtlbe_invalidate(vcpu_e500, 0, esel); if (value & MMUCSR0_TLB1FI) - for (esel = 0; esel < vcpu_e500->gtlb_size[1]; esel++) + for (esel = 0; esel < vcpu_e500->gtlb_params[1].entries; esel++) kvmppc_e500_gtlbe_invalidate(vcpu_e500, 1, esel); /* Invalidate all vcpu id mappings */ @@ -797,7 +797,8 @@ int kvmppc_e500_emul_tlbivax(struct kvm_vcpu *vcpu, int ra, int rb) if (ia) { /* invalidate all entries */ - for (esel = 0; esel < vcpu_e500->gtlb_size[tlbsel]; esel++) + for (esel = 0; esel < vcpu_e500->gtlb_params[tlbsel].entries; + esel++) kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel); } else { ea &= 0xfffff000; @@ -817,18 +818,17 @@ int kvmppc_e500_emul_tlbre(struct kvm_vcpu *vcpu) { struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu); int tlbsel, esel; - struct tlbe *gtlbe; + struct kvm_book3e_206_tlb_entry *gtlbe; tlbsel = get_tlb_tlbsel(vcpu_e500); esel = get_tlb_esel(vcpu_e500, tlbsel); - gtlbe = &vcpu_e500->gtlb_arch[tlbsel][esel]; + gtlbe = get_entry(vcpu_e500, tlbsel, esel); vcpu_e500->mas0 &= ~MAS0_NV(~0); vcpu_e500->mas0 |= MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]); vcpu_e500->mas1 = gtlbe->mas1; vcpu_e500->mas2 = gtlbe->mas2; - vcpu_e500->mas3 = gtlbe->mas3; - vcpu_e500->mas7 = gtlbe->mas7; + vcpu_e500->mas7_3 = gtlbe->mas7_3; return EMULATE_DONE; } @@ -839,7 +839,7 @@ int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, int rb) int as = !!get_cur_sas(vcpu_e500); unsigned int pid = get_cur_spid(vcpu_e500); int esel, tlbsel; - struct tlbe *gtlbe = NULL; + struct kvm_book3e_206_tlb_entry *gtlbe = NULL; gva_t ea; ea = kvmppc_get_gpr(vcpu, rb); @@ -847,7 +847,7 @@ int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, int rb) for (tlbsel = 0; tlbsel < 2; tlbsel++) { esel = kvmppc_e500_tlb_index(vcpu_e500, ea, tlbsel, pid, as); if (esel >= 0) { - gtlbe = &vcpu_e500->gtlb_arch[tlbsel][esel]; + gtlbe = get_entry(vcpu_e500, tlbsel, esel); break; } } @@ -857,8 +857,7 @@ int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, int rb) | MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]); vcpu_e500->mas1 = gtlbe->mas1; vcpu_e500->mas2 = gtlbe->mas2; - vcpu_e500->mas3 = gtlbe->mas3; - vcpu_e500->mas7 = gtlbe->mas7; + vcpu_e500->mas7_3 = gtlbe->mas7_3; } else { int victim; @@ -873,8 +872,7 @@ int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, int rb) | (vcpu_e500->mas4 & MAS4_TSIZED(~0)); vcpu_e500->mas2 &= MAS2_EPN; vcpu_e500->mas2 |= vcpu_e500->mas4 & MAS2_ATTRIB_MASK; - vcpu_e500->mas3 &= MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3; - vcpu_e500->mas7 = 0; + vcpu_e500->mas7_3 &= MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3; } kvmppc_set_exit_type(vcpu, EMULATED_TLBSX_EXITS); @@ -883,8 +881,8 @@ int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, int rb) /* sesel is index into the set, not the whole array */ static void write_stlbe(struct kvmppc_vcpu_e500 *vcpu_e500, - struct tlbe *gtlbe, - struct tlbe *stlbe, + struct kvm_book3e_206_tlb_entry *gtlbe, + struct kvm_book3e_206_tlb_entry *stlbe, int stlbsel, int sesel) { int stid; @@ -902,28 +900,27 @@ static void write_stlbe(struct kvmppc_vcpu_e500 *vcpu_e500, int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu) { struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu); - struct tlbe *gtlbe; + struct kvm_book3e_206_tlb_entry *gtlbe; int tlbsel, esel; tlbsel = get_tlb_tlbsel(vcpu_e500); esel = get_tlb_esel(vcpu_e500, tlbsel); - gtlbe = &vcpu_e500->gtlb_arch[tlbsel][esel]; + gtlbe = get_entry(vcpu_e500, tlbsel, esel); if (get_tlb_v(gtlbe)) inval_gtlbe_on_host(vcpu_e500, tlbsel, esel); gtlbe->mas1 = vcpu_e500->mas1; gtlbe->mas2 = vcpu_e500->mas2; - gtlbe->mas3 = vcpu_e500->mas3; - gtlbe->mas7 = vcpu_e500->mas7; + gtlbe->mas7_3 = vcpu_e500->mas7_3; trace_kvm_gtlb_write(vcpu_e500->mas0, gtlbe->mas1, gtlbe->mas2, - gtlbe->mas3, gtlbe->mas7); + (u32)gtlbe->mas7_3, (u32)(gtlbe->mas7_3 >> 32)); /* Invalidate shadow mappings for the about-to-be-clobbered TLBE. */ if (tlbe_is_host_safe(vcpu, gtlbe)) { - struct tlbe stlbe; + struct kvm_book3e_206_tlb_entry stlbe; int stlbsel, sesel; u64 eaddr; u64 raddr; @@ -996,9 +993,11 @@ gpa_t kvmppc_mmu_xlate(struct kvm_vcpu *vcpu, unsigned int index, gva_t eaddr) { struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu); - struct tlbe *gtlbe = - &vcpu_e500->gtlb_arch[tlbsel_of(index)][esel_of(index)]; - u64 pgmask = get_tlb_bytes(gtlbe) - 1; + struct kvm_book3e_206_tlb_entry *gtlbe; + u64 pgmask; + + gtlbe = get_entry(vcpu_e500, tlbsel_of(index), esel_of(index)); + pgmask = get_tlb_bytes(gtlbe) - 1; return get_tlb_raddr(gtlbe) | (eaddr & pgmask); } @@ -1012,12 +1011,12 @@ void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 eaddr, gpa_t gpaddr, { struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu); struct tlbe_priv *priv; - struct tlbe *gtlbe, stlbe; + struct kvm_book3e_206_tlb_entry *gtlbe, stlbe; int tlbsel = tlbsel_of(index); int esel = esel_of(index); int stlbsel, sesel; - gtlbe = &vcpu_e500->gtlb_arch[tlbsel][esel]; + gtlbe = get_entry(vcpu_e500, tlbsel, esel); switch (tlbsel) { case 0: @@ -1073,25 +1072,174 @@ void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 pid) void kvmppc_e500_tlb_setup(struct kvmppc_vcpu_e500 *vcpu_e500) { - struct tlbe *tlbe; + struct kvm_book3e_206_tlb_entry *tlbe; /* Insert large initial mapping for guest. */ - tlbe = &vcpu_e500->gtlb_arch[1][0]; + tlbe = get_entry(vcpu_e500, 1, 0); tlbe->mas1 = MAS1_VALID | MAS1_TSIZE(BOOK3E_PAGESZ_256M); tlbe->mas2 = 0; - tlbe->mas3 = E500_TLB_SUPER_PERM_MASK; - tlbe->mas7 = 0; + tlbe->mas7_3 = E500_TLB_SUPER_PERM_MASK; /* 4K map for serial output. Used by kernel wrapper. */ - tlbe = &vcpu_e500->gtlb_arch[1][1]; + tlbe = get_entry(vcpu_e500, 1, 1); tlbe->mas1 = MAS1_VALID | MAS1_TSIZE(BOOK3E_PAGESZ_4K); tlbe->mas2 = (0xe0004500 & 0xFFFFF000) | MAS2_I | MAS2_G; - tlbe->mas3 = (0xe0004500 & 0xFFFFF000) | E500_TLB_SUPER_PERM_MASK; - tlbe->mas7 = 0; + tlbe->mas7_3 = (0xe0004500 & 0xFFFFF000) | E500_TLB_SUPER_PERM_MASK; +} + +static void free_gtlb(struct kvmppc_vcpu_e500 *vcpu_e500) +{ + int i; + + clear_tlb_refs(vcpu_e500); + kfree(vcpu_e500->gtlb_priv[0]); + kfree(vcpu_e500->gtlb_priv[1]); + + if (vcpu_e500->shared_tlb_pages) { + vfree((void *)(round_down((uintptr_t)vcpu_e500->gtlb_arch, + PAGE_SIZE))); + + for (i = 0; i < vcpu_e500->num_shared_tlb_pages; i++) { + set_page_dirty_lock(vcpu_e500->shared_tlb_pages[i]); + put_page(vcpu_e500->shared_tlb_pages[i]); + } + + vcpu_e500->num_shared_tlb_pages = 0; + vcpu_e500->shared_tlb_pages = NULL; + } else { + kfree(vcpu_e500->gtlb_arch); + } + + vcpu_e500->gtlb_arch = NULL; +} + +int kvm_vcpu_ioctl_config_tlb(struct kvm_vcpu *vcpu, + struct kvm_config_tlb *cfg) +{ + struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu); + struct kvm_book3e_206_tlb_params params; + char *virt; + struct page **pages; + struct tlbe_priv *privs[2] = {}; + size_t array_len; + u32 sets; + int num_pages, ret, i; + + if (cfg->mmu_type != KVM_MMU_FSL_BOOKE_NOHV) + return -EINVAL; + + if (copy_from_user(¶ms, (void __user *)(uintptr_t)cfg->params, + sizeof(params))) + return -EFAULT; + + if (params.tlb_sizes[1] > 64) + return -EINVAL; + if (params.tlb_ways[1] != params.tlb_sizes[1]) + return -EINVAL; + if (params.tlb_sizes[2] != 0 || params.tlb_sizes[3] != 0) + return -EINVAL; + if (params.tlb_ways[2] != 0 || params.tlb_ways[3] != 0) + return -EINVAL; + + if (!is_power_of_2(params.tlb_ways[0])) + return -EINVAL; + + sets = params.tlb_sizes[0] >> ilog2(params.tlb_ways[0]); + if (!is_power_of_2(sets)) + return -EINVAL; + + array_len = params.tlb_sizes[0] + params.tlb_sizes[1]; + array_len *= sizeof(struct kvm_book3e_206_tlb_entry); + + if (cfg->array_len < array_len) + return -EINVAL; + + num_pages = DIV_ROUND_UP(cfg->array + array_len - 1, PAGE_SIZE) - + cfg->array / PAGE_SIZE; + pages = kmalloc(sizeof(struct page *) * num_pages, GFP_KERNEL); + if (!pages) + return -ENOMEM; + + ret = get_user_pages_fast(cfg->array, num_pages, 1, pages); + if (ret < 0) + goto err_pages; + + if (ret != num_pages) { + num_pages = ret; + ret = -EFAULT; + goto err_put_page; + } + + virt = vmap(pages, num_pages, VM_MAP, PAGE_KERNEL); + if (!virt) + goto err_put_page; + + privs[0] = kzalloc(sizeof(struct tlbe_priv) * params.tlb_sizes[0], + GFP_KERNEL); + privs[1] = kzalloc(sizeof(struct tlbe_priv) * params.tlb_sizes[1], + GFP_KERNEL); + + if (!privs[0] || !privs[1]) + goto err_put_page; + + free_gtlb(vcpu_e500); + + vcpu_e500->gtlb_priv[0] = privs[0]; + vcpu_e500->gtlb_priv[1] = privs[1]; + + vcpu_e500->gtlb_arch = (struct kvm_book3e_206_tlb_entry *) + (virt + (cfg->array & (PAGE_SIZE - 1))); + + vcpu_e500->gtlb_params[0].entries = params.tlb_sizes[0]; + vcpu_e500->gtlb_params[1].entries = params.tlb_sizes[1]; + + vcpu_e500->gtlb_offset[0] = 0; + vcpu_e500->gtlb_offset[1] = params.tlb_sizes[0]; + + vcpu_e500->tlb0cfg = mfspr(SPRN_TLB0CFG) & ~0xfffUL; + if (params.tlb_sizes[0] <= 2048) + vcpu_e500->tlb0cfg |= params.tlb_sizes[0]; + + vcpu_e500->tlb1cfg = mfspr(SPRN_TLB1CFG) & ~0xfffUL; + vcpu_e500->tlb1cfg |= params.tlb_sizes[1]; + + vcpu_e500->shared_tlb_pages = pages; + vcpu_e500->num_shared_tlb_pages = num_pages; + + vcpu_e500->gtlb_params[0].ways = params.tlb_ways[0]; + vcpu_e500->gtlb_params[0].sets = sets; + + vcpu_e500->gtlb_params[1].ways = params.tlb_sizes[1]; + vcpu_e500->gtlb_params[1].sets = 1; + + return 0; + +err_put_page: + kfree(privs[0]); + kfree(privs[1]); + + for (i = 0; i < num_pages; i++) + put_page(pages[i]); + +err_pages: + kfree(pages); + return ret; +} + +int kvm_vcpu_ioctl_dirty_tlb(struct kvm_vcpu *vcpu, + struct kvm_dirty_tlb *dirty) +{ + struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu); + + clear_tlb_refs(vcpu_e500); + return 0; } int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500) { + int entry_size = sizeof(struct kvm_book3e_206_tlb_entry); + int entries = KVM_E500_TLB0_SIZE + KVM_E500_TLB1_SIZE; + host_tlb_params[0].entries = mfspr(SPRN_TLB0CFG) & TLBnCFG_N_ENTRY; host_tlb_params[1].entries = mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY; @@ -1124,17 +1272,22 @@ int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500) host_tlb_params[0].entries / host_tlb_params[0].ways; host_tlb_params[1].sets = 1; - vcpu_e500->gtlb_size[0] = KVM_E500_TLB0_SIZE; - vcpu_e500->gtlb_arch[0] = - kzalloc(sizeof(struct tlbe) * KVM_E500_TLB0_SIZE, GFP_KERNEL); - if (vcpu_e500->gtlb_arch[0] == NULL) - goto err; + vcpu_e500->gtlb_params[0].entries = KVM_E500_TLB0_SIZE; + vcpu_e500->gtlb_params[1].entries = KVM_E500_TLB1_SIZE; - vcpu_e500->gtlb_size[1] = KVM_E500_TLB1_SIZE; - vcpu_e500->gtlb_arch[1] = - kzalloc(sizeof(struct tlbe) * KVM_E500_TLB1_SIZE, GFP_KERNEL); - if (vcpu_e500->gtlb_arch[1] == NULL) - goto err; + vcpu_e500->gtlb_params[0].ways = KVM_E500_TLB0_WAY_NUM; + vcpu_e500->gtlb_params[0].sets = + KVM_E500_TLB0_SIZE / KVM_E500_TLB0_WAY_NUM; + + vcpu_e500->gtlb_params[1].ways = KVM_E500_TLB1_SIZE; + vcpu_e500->gtlb_params[1].sets = 1; + + vcpu_e500->gtlb_arch = kmalloc(entries * entry_size, GFP_KERNEL); + if (!vcpu_e500->gtlb_arch) + return -ENOMEM; + + vcpu_e500->gtlb_offset[0] = 0; + vcpu_e500->gtlb_offset[1] = KVM_E500_TLB0_SIZE; vcpu_e500->tlb_refs[0] = kzalloc(sizeof(struct tlbe_ref) * host_tlb_params[0].entries, @@ -1148,15 +1301,15 @@ int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500) if (!vcpu_e500->tlb_refs[1]) goto err; - vcpu_e500->gtlb_priv[0] = - kzalloc(sizeof(struct tlbe_ref) * vcpu_e500->gtlb_size[0], - GFP_KERNEL); + vcpu_e500->gtlb_priv[0] = kzalloc(sizeof(struct tlbe_ref) * + vcpu_e500->gtlb_params[0].entries, + GFP_KERNEL); if (!vcpu_e500->gtlb_priv[0]) goto err; - vcpu_e500->gtlb_priv[1] = - kzalloc(sizeof(struct tlbe_ref) * vcpu_e500->gtlb_size[1], - GFP_KERNEL); + vcpu_e500->gtlb_priv[1] = kzalloc(sizeof(struct tlbe_ref) * + vcpu_e500->gtlb_params[1].entries, + GFP_KERNEL); if (!vcpu_e500->gtlb_priv[1]) goto err; @@ -1165,32 +1318,24 @@ int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500) /* Init TLB configuration register */ vcpu_e500->tlb0cfg = mfspr(SPRN_TLB0CFG) & ~0xfffUL; - vcpu_e500->tlb0cfg |= vcpu_e500->gtlb_size[0]; + vcpu_e500->tlb0cfg |= vcpu_e500->gtlb_params[0].entries; vcpu_e500->tlb1cfg = mfspr(SPRN_TLB1CFG) & ~0xfffUL; - vcpu_e500->tlb1cfg |= vcpu_e500->gtlb_size[1]; + vcpu_e500->tlb1cfg |= vcpu_e500->gtlb_params[1].entries; return 0; err: + free_gtlb(vcpu_e500); kfree(vcpu_e500->tlb_refs[0]); kfree(vcpu_e500->tlb_refs[1]); - kfree(vcpu_e500->gtlb_priv[0]); - kfree(vcpu_e500->gtlb_priv[1]); - kfree(vcpu_e500->gtlb_arch[0]); - kfree(vcpu_e500->gtlb_arch[1]); return -1; } void kvmppc_e500_tlb_uninit(struct kvmppc_vcpu_e500 *vcpu_e500) { - clear_tlb_refs(vcpu_e500); - + free_gtlb(vcpu_e500); kvmppc_e500_id_table_free(vcpu_e500); kfree(vcpu_e500->tlb_refs[0]); kfree(vcpu_e500->tlb_refs[1]); - kfree(vcpu_e500->gtlb_priv[0]); - kfree(vcpu_e500->gtlb_priv[1]); - kfree(vcpu_e500->gtlb_arch[1]); - kfree(vcpu_e500->gtlb_arch[0]); } diff --git a/arch/powerpc/kvm/e500_tlb.h b/arch/powerpc/kvm/e500_tlb.h index b587f691459..2c296407e75 100644 --- a/arch/powerpc/kvm/e500_tlb.h +++ b/arch/powerpc/kvm/e500_tlb.h @@ -20,13 +20,9 @@ #include #include -#define KVM_E500_TLB0_WAY_SIZE_BIT 7 /* Fixed */ -#define KVM_E500_TLB0_WAY_SIZE (1UL << KVM_E500_TLB0_WAY_SIZE_BIT) -#define KVM_E500_TLB0_WAY_SIZE_MASK (KVM_E500_TLB0_WAY_SIZE - 1) - -#define KVM_E500_TLB0_WAY_NUM_BIT 1 /* No greater than 7 */ -#define KVM_E500_TLB0_WAY_NUM (1UL << KVM_E500_TLB0_WAY_NUM_BIT) -#define KVM_E500_TLB0_WAY_NUM_MASK (KVM_E500_TLB0_WAY_NUM - 1) +/* This geometry is the legacy default -- can be overridden by userspace */ +#define KVM_E500_TLB0_WAY_SIZE 128 +#define KVM_E500_TLB0_WAY_NUM 2 #define KVM_E500_TLB0_SIZE (KVM_E500_TLB0_WAY_SIZE * KVM_E500_TLB0_WAY_NUM) #define KVM_E500_TLB1_SIZE 16 @@ -58,50 +54,54 @@ extern void kvmppc_e500_tlb_setup(struct kvmppc_vcpu_e500 *); extern void kvmppc_e500_recalc_shadow_pid(struct kvmppc_vcpu_e500 *); /* TLB helper functions */ -static inline unsigned int get_tlb_size(const struct tlbe *tlbe) +static inline unsigned int +get_tlb_size(const struct kvm_book3e_206_tlb_entry *tlbe) { return (tlbe->mas1 >> 7) & 0x1f; } -static inline gva_t get_tlb_eaddr(const struct tlbe *tlbe) +static inline gva_t get_tlb_eaddr(const struct kvm_book3e_206_tlb_entry *tlbe) { return tlbe->mas2 & 0xfffff000; } -static inline u64 get_tlb_bytes(const struct tlbe *tlbe) +static inline u64 get_tlb_bytes(const struct kvm_book3e_206_tlb_entry *tlbe) { unsigned int pgsize = get_tlb_size(tlbe); return 1ULL << 10 << pgsize; } -static inline gva_t get_tlb_end(const struct tlbe *tlbe) +static inline gva_t get_tlb_end(const struct kvm_book3e_206_tlb_entry *tlbe) { u64 bytes = get_tlb_bytes(tlbe); return get_tlb_eaddr(tlbe) + bytes - 1; } -static inline u64 get_tlb_raddr(const struct tlbe *tlbe) +static inline u64 get_tlb_raddr(const struct kvm_book3e_206_tlb_entry *tlbe) { - u64 rpn = tlbe->mas7; - return (rpn << 32) | (tlbe->mas3 & 0xfffff000); + return tlbe->mas7_3 & ~0xfffULL; } -static inline unsigned int get_tlb_tid(const struct tlbe *tlbe) +static inline unsigned int +get_tlb_tid(const struct kvm_book3e_206_tlb_entry *tlbe) { return (tlbe->mas1 >> 16) & 0xff; } -static inline unsigned int get_tlb_ts(const struct tlbe *tlbe) +static inline unsigned int +get_tlb_ts(const struct kvm_book3e_206_tlb_entry *tlbe) { return (tlbe->mas1 >> 12) & 0x1; } -static inline unsigned int get_tlb_v(const struct tlbe *tlbe) +static inline unsigned int +get_tlb_v(const struct kvm_book3e_206_tlb_entry *tlbe) { return (tlbe->mas1 >> 31) & 0x1; } -static inline unsigned int get_tlb_iprot(const struct tlbe *tlbe) +static inline unsigned int +get_tlb_iprot(const struct kvm_book3e_206_tlb_entry *tlbe) { return (tlbe->mas1 >> 30) & 0x1; } @@ -156,7 +156,7 @@ static inline unsigned int get_tlb_esel_bit( } static inline int tlbe_is_host_safe(const struct kvm_vcpu *vcpu, - const struct tlbe *tlbe) + const struct kvm_book3e_206_tlb_entry *tlbe) { gpa_t gpa; diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index a5671616af8..3cf6fba513a 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -222,6 +222,9 @@ int kvm_dev_ioctl_check_extension(long ext) case KVM_CAP_PPC_PAIRED_SINGLES: case KVM_CAP_PPC_OSI: case KVM_CAP_PPC_GET_PVINFO: +#ifdef CONFIG_KVM_E500 + case KVM_CAP_SW_TLB: +#endif r = 1; break; case KVM_CAP_COALESCED_MMIO: @@ -602,6 +605,19 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, r = 0; vcpu->arch.papr_enabled = true; break; +#ifdef CONFIG_KVM_E500 + case KVM_CAP_SW_TLB: { + struct kvm_config_tlb cfg; + void __user *user_ptr = (void __user *)(uintptr_t)cap->args[0]; + + r = -EFAULT; + if (copy_from_user(&cfg, user_ptr, sizeof(cfg))) + break; + + r = kvm_vcpu_ioctl_config_tlb(vcpu, &cfg); + break; + } +#endif default: r = -EINVAL; break; @@ -651,6 +667,18 @@ long kvm_arch_vcpu_ioctl(struct file *filp, r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap); break; } + +#ifdef CONFIG_KVM_E500 + case KVM_DIRTY_TLB: { + struct kvm_dirty_tlb dirty; + r = -EFAULT; + if (copy_from_user(&dirty, argp, sizeof(dirty))) + goto out; + r = kvm_vcpu_ioctl_dirty_tlb(vcpu, &dirty); + break; + } +#endif + default: r = -EINVAL; } -- cgit v1.2.3 From 303b7c97e369ec3d7ab7ba0551030160ce3f838a Mon Sep 17 00:00:00 2001 From: Scott Wood Date: Thu, 18 Aug 2011 15:25:23 -0500 Subject: KVM: PPC: e500: tlbsx: fix tlb0 esel It should contain the way, not the absolute TLB0 index. Signed-off-by: Scott Wood Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/e500_tlb.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/e500_tlb.c b/arch/powerpc/kvm/e500_tlb.c index f19ae2f6152..ec17148392b 100644 --- a/arch/powerpc/kvm/e500_tlb.c +++ b/arch/powerpc/kvm/e500_tlb.c @@ -853,6 +853,8 @@ int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, int rb) } if (gtlbe) { + esel &= vcpu_e500->gtlb_params[tlbsel].ways - 1; + vcpu_e500->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(esel) | MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]); vcpu_e500->mas1 = gtlbe->mas1; -- cgit v1.2.3 From 841741f23b91088810e657a535b8aa683136d870 Mon Sep 17 00:00:00 2001 From: Scott Wood Date: Fri, 2 Sep 2011 17:39:37 -0500 Subject: KVM: PPC: e500: Don't hardcode PIR=0 The hardcoded behavior prevents proper SMP support. user space shall specify the vcpu's PIR as the vcpu id. Signed-off-by: Scott Wood Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/booke.c | 4 ++-- arch/powerpc/kvm/e500.c | 3 --- 2 files changed, 2 insertions(+), 5 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index bb6c988f010..b64220079d5 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -761,7 +761,7 @@ static void get_sregs_arch206(struct kvm_vcpu *vcpu, { sregs->u.e.features |= KVM_SREGS_E_ARCH206; - sregs->u.e.pir = 0; + sregs->u.e.pir = vcpu->vcpu_id; sregs->u.e.mcsrr0 = vcpu->arch.mcsrr0; sregs->u.e.mcsrr1 = vcpu->arch.mcsrr1; sregs->u.e.decar = vcpu->arch.decar; @@ -774,7 +774,7 @@ static int set_sregs_arch206(struct kvm_vcpu *vcpu, if (!(sregs->u.e.features & KVM_SREGS_E_ARCH206)) return 0; - if (sregs->u.e.pir != 0) + if (sregs->u.e.pir != vcpu->vcpu_id) return -EINVAL; vcpu->arch.mcsrr0 = sregs->u.e.mcsrr0; diff --git a/arch/powerpc/kvm/e500.c b/arch/powerpc/kvm/e500.c index f17d7e732a1..ac3c4bf2167 100644 --- a/arch/powerpc/kvm/e500.c +++ b/arch/powerpc/kvm/e500.c @@ -71,9 +71,6 @@ int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu) vcpu->arch.pvr = mfspr(SPRN_PVR); vcpu_e500->svr = mfspr(SPRN_SVR); - /* Since booke kvm only support one core, update all vcpus' PIR to 0 */ - vcpu->vcpu_id = 0; - vcpu->arch.cpu_type = KVM_CPU_E500V2; return 0; -- cgit v1.2.3 From 95325e6b190bb4ec3383aa1241d10675057bff45 Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Tue, 20 Sep 2011 01:31:48 +0200 Subject: KVM: PPC: E500: Support hugetlbfs With hugetlbfs support emerging on e500, we should also support KVM backing its guest memory by it. This patch adds support for hugetlbfs into the e500 shadow mmu code. Signed-off-by: Alexander Graf Acked-by: Scott Wood Signed-off-by: Avi Kivity --- arch/powerpc/kvm/e500_tlb.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/e500_tlb.c b/arch/powerpc/kvm/e500_tlb.c index ec17148392b..6fefb9144f2 100644 --- a/arch/powerpc/kvm/e500_tlb.c +++ b/arch/powerpc/kvm/e500_tlb.c @@ -24,6 +24,7 @@ #include #include #include +#include #include #include @@ -673,12 +674,31 @@ static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500, pfn &= ~(tsize_pages - 1); break; } + } else if (vma && hva >= vma->vm_start && + (vma->vm_flags & VM_HUGETLB)) { + unsigned long psize = vma_kernel_pagesize(vma); + + tsize = (gtlbe->mas1 & MAS1_TSIZE_MASK) >> + MAS1_TSIZE_SHIFT; + + /* + * Take the largest page size that satisfies both host + * and guest mapping + */ + tsize = min(__ilog2(psize) - 10, tsize); + + /* + * e500 doesn't implement the lowest tsize bit, + * or 1K pages. + */ + tsize = max(BOOK3E_PAGESZ_4K, tsize & ~1); } up_read(¤t->mm->mmap_sem); } if (likely(!pfnmap)) { + unsigned long tsize_pages = 1 << (tsize + 10 - PAGE_SHIFT); pfn = gfn_to_pfn_memslot(vcpu_e500->vcpu.kvm, slot, gfn); if (is_error_pfn(pfn)) { printk(KERN_ERR "Couldn't get real page for gfn %lx!\n", @@ -686,6 +706,10 @@ static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500, kvm_release_pfn_clean(pfn); return; } + + /* Align guest and physical address to page map boundaries */ + pfn &= ~(tsize_pages - 1); + gvaddr &= ~((tsize_pages << PAGE_SHIFT) - 1); } /* Drop old ref and setup new one. */ -- cgit v1.2.3 From f9208427f72e6cb52c71767af3bf8c14c43c27ac Mon Sep 17 00:00:00 2001 From: Bharat Bhushan Date: Thu, 13 Oct 2011 15:17:08 +0530 Subject: PPC: Fix race in mtmsr paravirt implementation The current implementation of mtmsr and mtmsrd are racy in that it does: * check (int_pending == 0) ---> host sets int_pending = 1 <--- * write shared page * done while instead we should check for int_pending after the shared page is written. Signed-off-by: Bharat Bhushan Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kernel/kvm_emul.S | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kernel/kvm_emul.S b/arch/powerpc/kernel/kvm_emul.S index f2b1b2523e6..3d64c5704fd 100644 --- a/arch/powerpc/kernel/kvm_emul.S +++ b/arch/powerpc/kernel/kvm_emul.S @@ -167,6 +167,9 @@ maybe_stay_in_guest: kvm_emulate_mtmsr_reg2: ori r30, r0, 0 + /* Put MSR into magic page because we don't call mtmsr */ + STL64(r30, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0) + /* Check if we have to fetch an interrupt */ lwz r31, (KVM_MAGIC_PAGE + KVM_MAGIC_INT)(0) cmpwi r31, 0 @@ -174,15 +177,10 @@ kvm_emulate_mtmsr_reg2: /* Check if we may trigger an interrupt */ andi. r31, r30, MSR_EE - beq no_mtmsr - - b do_mtmsr + bne do_mtmsr no_mtmsr: - /* Put MSR into magic page because we don't call mtmsr */ - STL64(r30, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0) - SCRATCH_RESTORE /* Go back to caller */ -- cgit v1.2.3 From dc2babfea592e633cf3890294af6545609b466be Mon Sep 17 00:00:00 2001 From: Bharat Bhushan Date: Wed, 19 Oct 2011 09:46:06 +0530 Subject: KVM: PPC: Fix DEC truncation for greater than 0xffff_ffff/1000 kvmppc_emulate_dec() uses dec_nsec of type unsigned long and does below calculation: dec_nsec = vcpu->arch.dec; dec_nsec *= 1000; This will truncate if DEC value "vcpu->arch.dec" is greater than 0xffff_ffff/1000. For example : For tb_ticks_per_usec = 4a, we can not set decrementer more than ~58ms. Signed-off-by: Bharat Bhushan Acked-by: Liu Yu Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/emulate.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c index 141dce3c681..4337f99fa0f 100644 --- a/arch/powerpc/kvm/emulate.c +++ b/arch/powerpc/kvm/emulate.c @@ -84,6 +84,7 @@ static int kvmppc_dec_enabled(struct kvm_vcpu *vcpu) void kvmppc_emulate_dec(struct kvm_vcpu *vcpu) { unsigned long dec_nsec; + unsigned long long dec_time; pr_debug("mtDEC: %x\n", vcpu->arch.dec); #ifdef CONFIG_PPC_BOOK3S @@ -103,11 +104,12 @@ void kvmppc_emulate_dec(struct kvm_vcpu *vcpu) * host ticks. */ hrtimer_try_to_cancel(&vcpu->arch.dec_timer); - dec_nsec = vcpu->arch.dec; - dec_nsec *= 1000; - dec_nsec /= tb_ticks_per_usec; - hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec), - HRTIMER_MODE_REL); + dec_time = vcpu->arch.dec; + dec_time *= 1000; + do_div(dec_time, tb_ticks_per_usec); + dec_nsec = do_div(dec_time, NSEC_PER_SEC); + hrtimer_start(&vcpu->arch.dec_timer, + ktime_set(dec_time, dec_nsec), HRTIMER_MODE_REL); vcpu->arch.dec_jiffies = get_tb(); } else { hrtimer_try_to_cancel(&vcpu->arch.dec_timer); -- cgit v1.2.3 From 7401f6266de021990efc7bc212289219ba8f9a7a Mon Sep 17 00:00:00 2001 From: Bharat Bhushan Date: Mon, 31 Oct 2011 14:22:08 +0530 Subject: KVM: PPC: booke: Do Not start decrementer when SPRN_DEC set 0 As per specification the decrementer interrupt not happen when DEC is written with 0. Also when DEC is zero, no decrementer running. So we should not start hrtimer for decrementer when DEC = 0. Signed-off-by: Bharat Bhushan Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/emulate.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c index 4337f99fa0f..b6df56dd93b 100644 --- a/arch/powerpc/kvm/emulate.c +++ b/arch/powerpc/kvm/emulate.c @@ -77,7 +77,8 @@ static int kvmppc_dec_enabled(struct kvm_vcpu *vcpu) #else static int kvmppc_dec_enabled(struct kvm_vcpu *vcpu) { - return vcpu->arch.tcr & TCR_DIE; + /* On BOOKE, DEC = 0 is as good as decrementer not enabled */ + return (vcpu->arch.tcr & TCR_DIE) && vcpu->arch.dec; } #endif -- cgit v1.2.3 From 1d1ef22208876511224a8797657e40e287e1f93d Mon Sep 17 00:00:00 2001 From: Scott Wood Date: Tue, 8 Nov 2011 16:11:59 -0600 Subject: KVM: PPC: booke: check for signals in kvmppc_vcpu_run Currently we check prior to returning from a lightweight exit, but not prior to initial entry. book3s already does a similar test. Signed-off-by: Scott Wood Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/booke.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index b64220079d5..9c785896e86 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -322,11 +322,19 @@ int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu) } local_irq_disable(); + + if (signal_pending(current)) { + kvm_run->exit_reason = KVM_EXIT_INTR; + ret = -EINTR; + goto out; + } + kvm_guest_enter(); ret = __kvmppc_vcpu_run(kvm_run, vcpu); kvm_guest_exit(); - local_irq_enable(); +out: + local_irq_enable(); return ret; } -- cgit v1.2.3 From 7e28e60ef974d0eeb43112ef264d8c130f7b7bf4 Mon Sep 17 00:00:00 2001 From: Scott Wood Date: Tue, 8 Nov 2011 18:23:20 -0600 Subject: KVM: PPC: Rename deliver_interrupts to prepare_to_enter This function also updates paravirt int_pending, so rename it to be more obvious that this is a collection of checks run prior to (re)entering a guest. Signed-off-by: Scott Wood Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_ppc.h | 2 +- arch/powerpc/kvm/book3s.c | 2 +- arch/powerpc/kvm/book3s_hv.c | 6 +++--- arch/powerpc/kvm/book3s_pr.c | 2 +- arch/powerpc/kvm/booke.c | 4 ++-- arch/powerpc/kvm/powerpc.c | 2 +- 6 files changed, 9 insertions(+), 9 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h index a284f209e2d..c089927f64c 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -94,7 +94,7 @@ extern int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu, extern void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu); extern void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu); -extern void kvmppc_core_deliver_interrupts(struct kvm_vcpu *vcpu); +extern void kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu); extern int kvmppc_core_pending_dec(struct kvm_vcpu *vcpu); extern void kvmppc_core_queue_program(struct kvm_vcpu *vcpu, ulong flags); extern void kvmppc_core_queue_dec(struct kvm_vcpu *vcpu); diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c index e41ac6f7dcf..73fc9f04610 100644 --- a/arch/powerpc/kvm/book3s.c +++ b/arch/powerpc/kvm/book3s.c @@ -258,7 +258,7 @@ static bool clear_irqprio(struct kvm_vcpu *vcpu, unsigned int priority) return true; } -void kvmppc_core_deliver_interrupts(struct kvm_vcpu *vcpu) +void kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu) { unsigned long *pending = &vcpu->arch.pending_exceptions; unsigned long old_pending = vcpu->arch.pending_exceptions; diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 336983da9e7..536adee59c0 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -482,7 +482,7 @@ static void kvmppc_set_timer(struct kvm_vcpu *vcpu) if (now > vcpu->arch.dec_expires) { /* decrementer has already gone negative */ kvmppc_core_queue_dec(vcpu); - kvmppc_core_deliver_interrupts(vcpu); + kvmppc_core_prepare_to_enter(vcpu); return; } dec_nsec = (vcpu->arch.dec_expires - now) * NSEC_PER_SEC @@ -797,7 +797,7 @@ static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu) list_for_each_entry_safe(v, vn, &vc->runnable_threads, arch.run_list) { - kvmppc_core_deliver_interrupts(v); + kvmppc_core_prepare_to_enter(v); if (signal_pending(v->arch.run_task)) { kvmppc_remove_runnable(vc, v); v->stat.signal_exits++; @@ -857,7 +857,7 @@ int kvmppc_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu) if (run->exit_reason == KVM_EXIT_PAPR_HCALL && !(vcpu->arch.shregs.msr & MSR_PR)) { r = kvmppc_pseries_do_hcall(vcpu); - kvmppc_core_deliver_interrupts(vcpu); + kvmppc_core_prepare_to_enter(vcpu); } } while (r == RESUME_GUEST); return r; diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index e2cfb9e1e20..f3628581fb7 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -764,7 +764,7 @@ program_interrupt: /* In case an interrupt came in that was triggered * from userspace (like DEC), we need to check what * to inject now! */ - kvmppc_core_deliver_interrupts(vcpu); + kvmppc_core_prepare_to_enter(vcpu); } } diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index 9c785896e86..e082e348c88 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -289,7 +289,7 @@ static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu, } /* Check pending exceptions and deliver one, if possible. */ -void kvmppc_core_deliver_interrupts(struct kvm_vcpu *vcpu) +void kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu) { unsigned long *pending = &vcpu->arch.pending_exceptions; unsigned long old_pending = vcpu->arch.pending_exceptions; @@ -611,7 +611,7 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu, local_irq_disable(); - kvmppc_core_deliver_interrupts(vcpu); + kvmppc_core_prepare_to_enter(vcpu); if (!(r & RESUME_HOST)) { /* To avoid clobbering exit_reason, only check for signals if diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 3cf6fba513a..6186ec0d939 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -559,7 +559,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) vcpu->arch.hcall_needed = 0; } - kvmppc_core_deliver_interrupts(vcpu); + kvmppc_core_prepare_to_enter(vcpu); r = kvmppc_vcpu_run(run, vcpu); -- cgit v1.2.3 From 25051b5a5aff0bb71435421b4b80279b789fa0dc Mon Sep 17 00:00:00 2001 From: Scott Wood Date: Tue, 8 Nov 2011 18:23:23 -0600 Subject: KVM: PPC: Move prepare_to_enter call site into subarch code This function should be called with interrupts disabled, to avoid a race where an exception is delivered after we check, but the resched kick is received before we disable interrupts (and thus doesn't actually trigger the exit code that would recheck exceptions). booke already does this properly in the lightweight exit case, but not on initial entry. For now, move the call of prepare_to_enter into subarch-specific code so that booke can do the right thing here. Ideally book3s would do the same thing, but I'm having a hard time seeing where it does any interrupt disabling of this sort (plus it has several additional call sites), so I'm deferring the book3s fix to someone more familiar with that code. book3s behavior should be unchanged by this patch. Signed-off-by: Scott Wood Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/book3s_hv.c | 2 ++ arch/powerpc/kvm/book3s_pr.c | 2 ++ arch/powerpc/kvm/booke.c | 4 ++++ arch/powerpc/kvm/powerpc.c | 2 -- 4 files changed, 8 insertions(+), 2 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 536adee59c0..b1e3b9c1326 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -836,6 +836,8 @@ int kvmppc_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu) return -EINVAL; } + kvmppc_core_prepare_to_enter(vcpu); + /* No need to go into the guest when all we'll do is come back out */ if (signal_pending(current)) { run->exit_reason = KVM_EXIT_INTR; diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index f3628581fb7..203a7b7b58b 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -929,6 +929,8 @@ int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu) return -EINVAL; } + kvmppc_core_prepare_to_enter(vcpu); + /* No need to go into the guest when all we do is going out */ if (signal_pending(current)) { kvm_run->exit_reason = KVM_EXIT_INTR; diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index e082e348c88..feaefc43327 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -295,6 +295,8 @@ void kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu) unsigned long old_pending = vcpu->arch.pending_exceptions; unsigned int priority; + WARN_ON_ONCE(!irqs_disabled()); + priority = __ffs(*pending); while (priority <= BOOKE_IRQPRIO_MAX) { if (kvmppc_booke_irqprio_deliver(vcpu, priority)) @@ -323,6 +325,8 @@ int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu) local_irq_disable(); + kvmppc_core_prepare_to_enter(vcpu); + if (signal_pending(current)) { kvm_run->exit_reason = KVM_EXIT_INTR; ret = -EINTR; diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 6186ec0d939..7411bdd8ff6 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -559,8 +559,6 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) vcpu->arch.hcall_needed = 0; } - kvmppc_core_prepare_to_enter(vcpu); - r = kvmppc_vcpu_run(run, vcpu); if (vcpu->sigset_active) -- cgit v1.2.3 From c59a6a3e4e5976a938e21faf3da65a2784187aa7 Mon Sep 17 00:00:00 2001 From: Scott Wood Date: Tue, 8 Nov 2011 18:23:25 -0600 Subject: KVM: PPC: booke: Check for MSR[WE] in prepare_to_enter This prevents us from inappropriately blocking in a KVM_SET_REGS ioctl -- the MSR[WE] will take effect when the guest is next entered. It also causes SRR1[WE] to be set when we enter the guest's interrupt handler, which is what e500 hardware is documented to do. Signed-off-by: Scott Wood Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/booke.c | 28 ++++++++++++++++++---------- 1 file changed, 18 insertions(+), 10 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index feaefc43327..557f028a9ad 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -124,12 +124,6 @@ void kvmppc_set_msr(struct kvm_vcpu *vcpu, u32 new_msr) vcpu->arch.shared->msr = new_msr; kvmppc_mmu_msr_notify(vcpu, old_msr); - - if (vcpu->arch.shared->msr & MSR_WE) { - kvm_vcpu_block(vcpu); - kvmppc_set_exit_type(vcpu, EMULATED_MTMSRWE_EXITS); - }; - kvmppc_vcpu_sync_spe(vcpu); } @@ -288,15 +282,12 @@ static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu, return allowed; } -/* Check pending exceptions and deliver one, if possible. */ -void kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu) +static void kvmppc_core_check_exceptions(struct kvm_vcpu *vcpu) { unsigned long *pending = &vcpu->arch.pending_exceptions; unsigned long old_pending = vcpu->arch.pending_exceptions; unsigned int priority; - WARN_ON_ONCE(!irqs_disabled()); - priority = __ffs(*pending); while (priority <= BOOKE_IRQPRIO_MAX) { if (kvmppc_booke_irqprio_deliver(vcpu, priority)) @@ -314,6 +305,23 @@ void kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu) vcpu->arch.shared->int_pending = 0; } +/* Check pending exceptions and deliver one, if possible. */ +void kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu) +{ + WARN_ON_ONCE(!irqs_disabled()); + + kvmppc_core_check_exceptions(vcpu); + + if (vcpu->arch.shared->msr & MSR_WE) { + local_irq_enable(); + kvm_vcpu_block(vcpu); + local_irq_disable(); + + kvmppc_set_exit_type(vcpu, EMULATED_MTMSRWE_EXITS); + kvmppc_core_check_exceptions(vcpu); + }; +} + int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu) { int ret; -- cgit v1.2.3 From 29ac26efbdc651303643025c83009ce5766c1676 Mon Sep 17 00:00:00 2001 From: Scott Wood Date: Tue, 8 Nov 2011 18:23:27 -0600 Subject: KVM: PPC: booke: Fix int_pending calculation for MSR[EE] paravirt int_pending was only being lowered if a bit in pending_exceptions was cleared during exception delivery -- but for interrupts, we clear it during IACK/TSR emulation. This caused paravirt for enabling MSR[EE] to be ineffective. Signed-off-by: Scott Wood Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/booke.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index 557f028a9ad..8dfc59a8a71 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -285,7 +285,6 @@ static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu, static void kvmppc_core_check_exceptions(struct kvm_vcpu *vcpu) { unsigned long *pending = &vcpu->arch.pending_exceptions; - unsigned long old_pending = vcpu->arch.pending_exceptions; unsigned int priority; priority = __ffs(*pending); @@ -299,10 +298,7 @@ static void kvmppc_core_check_exceptions(struct kvm_vcpu *vcpu) } /* Tell the guest about our interrupt status */ - if (*pending) - vcpu->arch.shared->int_pending = 1; - else if (old_pending) - vcpu->arch.shared->int_pending = 0; + vcpu->arch.shared->int_pending = !!*pending; } /* Check pending exceptions and deliver one, if possible. */ -- cgit v1.2.3 From 940b45ec18cf00046b8b28299d97066a2c43d559 Mon Sep 17 00:00:00 2001 From: Scott Wood Date: Tue, 8 Nov 2011 18:23:28 -0600 Subject: KVM: PPC: booke: Paravirtualize wrtee Also fix wrteei 1 paravirt to check for a pending interrupt. Signed-off-by: Scott Wood Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kernel/kvm.c | 92 ++++++++++++++++++++++++++++++++++------ arch/powerpc/kernel/kvm_emul.S | 96 ++++++++++++++++++++++++++++++++---------- 2 files changed, 154 insertions(+), 34 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c index 2985338d0e1..06b15ee997f 100644 --- a/arch/powerpc/kernel/kvm.c +++ b/arch/powerpc/kernel/kvm.c @@ -1,5 +1,6 @@ /* * Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved. + * Copyright 2010-2011 Freescale Semiconductor, Inc. * * Authors: * Alexander Graf @@ -29,6 +30,7 @@ #include #include #include +#include #define KVM_MAGIC_PAGE (-4096L) #define magic_var(x) KVM_MAGIC_PAGE + offsetof(struct kvm_vcpu_arch_shared, x) @@ -41,6 +43,7 @@ #define KVM_INST_B 0x48000000 #define KVM_INST_B_MASK 0x03ffffff #define KVM_INST_B_MAX 0x01ffffff +#define KVM_INST_LI 0x38000000 #define KVM_MASK_RT 0x03e00000 #define KVM_RT_30 0x03c00000 @@ -69,6 +72,7 @@ #define KVM_INST_MTMSRD_L1 0x7c010164 #define KVM_INST_MTMSR 0x7c000124 +#define KVM_INST_WRTEE 0x7c000106 #define KVM_INST_WRTEEI_0 0x7c000146 #define KVM_INST_WRTEEI_1 0x7c008146 @@ -270,26 +274,27 @@ static void kvm_patch_ins_mtmsr(u32 *inst, u32 rt) #ifdef CONFIG_BOOKE -extern u32 kvm_emulate_wrteei_branch_offs; -extern u32 kvm_emulate_wrteei_ee_offs; -extern u32 kvm_emulate_wrteei_len; -extern u32 kvm_emulate_wrteei[]; +extern u32 kvm_emulate_wrtee_branch_offs; +extern u32 kvm_emulate_wrtee_reg_offs; +extern u32 kvm_emulate_wrtee_orig_ins_offs; +extern u32 kvm_emulate_wrtee_len; +extern u32 kvm_emulate_wrtee[]; -static void kvm_patch_ins_wrteei(u32 *inst) +static void kvm_patch_ins_wrtee(u32 *inst, u32 rt, int imm_one) { u32 *p; int distance_start; int distance_end; ulong next_inst; - p = kvm_alloc(kvm_emulate_wrteei_len * 4); + p = kvm_alloc(kvm_emulate_wrtee_len * 4); if (!p) return; /* Find out where we are and put everything there */ distance_start = (ulong)p - (ulong)inst; next_inst = ((ulong)inst + 4); - distance_end = next_inst - (ulong)&p[kvm_emulate_wrteei_branch_offs]; + distance_end = next_inst - (ulong)&p[kvm_emulate_wrtee_branch_offs]; /* Make sure we only write valid b instructions */ if (distance_start > KVM_INST_B_MAX) { @@ -298,10 +303,65 @@ static void kvm_patch_ins_wrteei(u32 *inst) } /* Modify the chunk to fit the invocation */ - memcpy(p, kvm_emulate_wrteei, kvm_emulate_wrteei_len * 4); - p[kvm_emulate_wrteei_branch_offs] |= distance_end & KVM_INST_B_MASK; - p[kvm_emulate_wrteei_ee_offs] |= (*inst & MSR_EE); - flush_icache_range((ulong)p, (ulong)p + kvm_emulate_wrteei_len * 4); + memcpy(p, kvm_emulate_wrtee, kvm_emulate_wrtee_len * 4); + p[kvm_emulate_wrtee_branch_offs] |= distance_end & KVM_INST_B_MASK; + + if (imm_one) { + p[kvm_emulate_wrtee_reg_offs] = + KVM_INST_LI | __PPC_RT(30) | MSR_EE; + } else { + /* Make clobbered registers work too */ + switch (get_rt(rt)) { + case 30: + kvm_patch_ins_ll(&p[kvm_emulate_wrtee_reg_offs], + magic_var(scratch2), KVM_RT_30); + break; + case 31: + kvm_patch_ins_ll(&p[kvm_emulate_wrtee_reg_offs], + magic_var(scratch1), KVM_RT_30); + break; + default: + p[kvm_emulate_wrtee_reg_offs] |= rt; + break; + } + } + + p[kvm_emulate_wrtee_orig_ins_offs] = *inst; + flush_icache_range((ulong)p, (ulong)p + kvm_emulate_wrtee_len * 4); + + /* Patch the invocation */ + kvm_patch_ins_b(inst, distance_start); +} + +extern u32 kvm_emulate_wrteei_0_branch_offs; +extern u32 kvm_emulate_wrteei_0_len; +extern u32 kvm_emulate_wrteei_0[]; + +static void kvm_patch_ins_wrteei_0(u32 *inst) +{ + u32 *p; + int distance_start; + int distance_end; + ulong next_inst; + + p = kvm_alloc(kvm_emulate_wrteei_0_len * 4); + if (!p) + return; + + /* Find out where we are and put everything there */ + distance_start = (ulong)p - (ulong)inst; + next_inst = ((ulong)inst + 4); + distance_end = next_inst - (ulong)&p[kvm_emulate_wrteei_0_branch_offs]; + + /* Make sure we only write valid b instructions */ + if (distance_start > KVM_INST_B_MAX) { + kvm_patching_worked = false; + return; + } + + memcpy(p, kvm_emulate_wrteei_0, kvm_emulate_wrteei_0_len * 4); + p[kvm_emulate_wrteei_0_branch_offs] |= distance_end & KVM_INST_B_MASK; + flush_icache_range((ulong)p, (ulong)p + kvm_emulate_wrteei_0_len * 4); /* Patch the invocation */ kvm_patch_ins_b(inst, distance_start); @@ -444,6 +504,11 @@ static void kvm_check_ins(u32 *inst, u32 features) case KVM_INST_MTMSRD_L0: kvm_patch_ins_mtmsr(inst, inst_rt); break; +#ifdef CONFIG_BOOKE + case KVM_INST_WRTEE: + kvm_patch_ins_wrtee(inst, inst_rt, 0); + break; +#endif } switch (inst_no_rt & ~KVM_MASK_RB) { @@ -461,8 +526,11 @@ static void kvm_check_ins(u32 *inst, u32 features) switch (_inst) { #ifdef CONFIG_BOOKE case KVM_INST_WRTEEI_0: + kvm_patch_ins_wrteei_0(inst); + break; + case KVM_INST_WRTEEI_1: - kvm_patch_ins_wrteei(inst); + kvm_patch_ins_wrtee(inst, 0, 1); break; #endif } diff --git a/arch/powerpc/kernel/kvm_emul.S b/arch/powerpc/kernel/kvm_emul.S index 3d64c5704fd..801058dd74d 100644 --- a/arch/powerpc/kernel/kvm_emul.S +++ b/arch/powerpc/kernel/kvm_emul.S @@ -13,6 +13,7 @@ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * * Copyright SUSE Linux Products GmbH 2010 + * Copyright 2010-2011 Freescale Semiconductor, Inc. * * Authors: Alexander Graf */ @@ -208,24 +209,80 @@ kvm_emulate_mtmsr_orig_ins_offs: kvm_emulate_mtmsr_len: .long (kvm_emulate_mtmsr_end - kvm_emulate_mtmsr) / 4 +/* also used for wrteei 1 */ +.global kvm_emulate_wrtee +kvm_emulate_wrtee: + SCRATCH_SAVE + + /* Fetch old MSR in r31 */ + LL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0) -.global kvm_emulate_wrteei -kvm_emulate_wrteei: + /* Insert new MSR[EE] */ +kvm_emulate_wrtee_reg: + ori r30, r0, 0 + rlwimi r31, r30, 0, MSR_EE + + /* + * If MSR[EE] is now set, check for a pending interrupt. + * We could skip this if MSR[EE] was already on, but that + * should be rare, so don't bother. + */ + andi. r30, r30, MSR_EE + /* Put MSR into magic page because we don't call wrtee */ + STL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0) + + beq no_wrtee + + /* Check if we have to fetch an interrupt */ + lwz r30, (KVM_MAGIC_PAGE + KVM_MAGIC_INT)(0) + cmpwi r30, 0 + bne do_wrtee + +no_wrtee: + SCRATCH_RESTORE + + /* Go back to caller */ +kvm_emulate_wrtee_branch: + b . + +do_wrtee: + SCRATCH_RESTORE + + /* Just fire off the wrtee if it's critical */ +kvm_emulate_wrtee_orig_ins: + wrtee r0 + + b kvm_emulate_wrtee_branch + +kvm_emulate_wrtee_end: + +.global kvm_emulate_wrtee_branch_offs +kvm_emulate_wrtee_branch_offs: + .long (kvm_emulate_wrtee_branch - kvm_emulate_wrtee) / 4 + +.global kvm_emulate_wrtee_reg_offs +kvm_emulate_wrtee_reg_offs: + .long (kvm_emulate_wrtee_reg - kvm_emulate_wrtee) / 4 + +.global kvm_emulate_wrtee_orig_ins_offs +kvm_emulate_wrtee_orig_ins_offs: + .long (kvm_emulate_wrtee_orig_ins - kvm_emulate_wrtee) / 4 + +.global kvm_emulate_wrtee_len +kvm_emulate_wrtee_len: + .long (kvm_emulate_wrtee_end - kvm_emulate_wrtee) / 4 + +.global kvm_emulate_wrteei_0 +kvm_emulate_wrteei_0: SCRATCH_SAVE /* Fetch old MSR in r31 */ LL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0) /* Remove MSR_EE from old MSR */ - li r30, 0 - ori r30, r30, MSR_EE - andc r31, r31, r30 - - /* OR new MSR_EE onto the old MSR */ -kvm_emulate_wrteei_ee: - ori r31, r31, 0 + rlwinm r31, r31, 0, ~MSR_EE /* Write new MSR value back */ STL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0) @@ -233,22 +290,17 @@ kvm_emulate_wrteei_ee: SCRATCH_RESTORE /* Go back to caller */ -kvm_emulate_wrteei_branch: +kvm_emulate_wrteei_0_branch: b . -kvm_emulate_wrteei_end: - -.global kvm_emulate_wrteei_branch_offs -kvm_emulate_wrteei_branch_offs: - .long (kvm_emulate_wrteei_branch - kvm_emulate_wrteei) / 4 - -.global kvm_emulate_wrteei_ee_offs -kvm_emulate_wrteei_ee_offs: - .long (kvm_emulate_wrteei_ee - kvm_emulate_wrteei) / 4 +kvm_emulate_wrteei_0_end: -.global kvm_emulate_wrteei_len -kvm_emulate_wrteei_len: - .long (kvm_emulate_wrteei_end - kvm_emulate_wrteei) / 4 +.global kvm_emulate_wrteei_0_branch_offs +kvm_emulate_wrteei_0_branch_offs: + .long (kvm_emulate_wrteei_0_branch - kvm_emulate_wrteei_0) / 4 +.global kvm_emulate_wrteei_0_len +kvm_emulate_wrteei_0_len: + .long (kvm_emulate_wrteei_0_end - kvm_emulate_wrteei_0) / 4 .global kvm_emulate_mtsrin kvm_emulate_mtsrin: -- cgit v1.2.3 From b59049720dd95021dfe0d9f4e1fa9458a67cfe29 Mon Sep 17 00:00:00 2001 From: Scott Wood Date: Tue, 8 Nov 2011 18:23:30 -0600 Subject: KVM: PPC: Paravirtualize SPRG4-7, ESR, PIR, MASn This allows additional registers to be accessed by the guest in PR-mode KVM without trapping. SPRG4-7 are readable from userspace. On booke, KVM will sync these registers when it enters the guest, so that accesses from guest userspace will work. The guest kernel, OTOH, must consistently use either the real registers or the shared area between exits. This also applies to the already-paravirted SPRG3. On non-booke, it's not clear to what extent SPRG4-7 are supported (they're not architected for book3s, but exist on at least some classic chips). They are copied in the get/set regs ioctls, but I do not see any non-booke emulation. I also do not see any syncing with real registers (in PR-mode) including the user-readable SPRG3. This patch should not make that situation any worse. Signed-off-by: Scott Wood Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_e500.h | 8 -- arch/powerpc/include/asm/kvm_host.h | 6 -- arch/powerpc/include/asm/kvm_para.h | 31 +++++- arch/powerpc/kernel/asm-offsets.c | 15 ++- arch/powerpc/kernel/kvm.c | 204 ++++++++++++++++++++++++++++++------ arch/powerpc/kvm/book3s.c | 16 +-- arch/powerpc/kvm/booke.c | 23 ++-- arch/powerpc/kvm/booke_emulate.c | 12 +-- arch/powerpc/kvm/booke_interrupts.S | 18 ++-- arch/powerpc/kvm/e500.c | 24 ++--- arch/powerpc/kvm/e500_emulate.c | 38 ++++--- arch/powerpc/kvm/e500_tlb.c | 83 ++++++++------- arch/powerpc/kvm/e500_tlb.h | 25 ++--- arch/powerpc/kvm/emulate.c | 3 +- arch/powerpc/kvm/powerpc.c | 2 +- 15 files changed, 339 insertions(+), 169 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_e500.h b/arch/powerpc/include/asm/kvm_e500.h index bc17441535f..8cd50a51427 100644 --- a/arch/powerpc/include/asm/kvm_e500.h +++ b/arch/powerpc/include/asm/kvm_e500.h @@ -71,14 +71,6 @@ struct kvmppc_vcpu_e500 { u32 pid[E500_PID_NUM]; u32 svr; - u32 mas0; - u32 mas1; - u32 mas2; - u64 mas7_3; - u32 mas4; - u32 mas5; - u32 mas6; - /* vcpu id table */ struct vcpu_id_table *idt; diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index bf8af5d5d5d..bfd0c9912da 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -318,10 +318,6 @@ struct kvm_vcpu_arch { u32 vrsave; /* also USPRG0 */ u32 mmucr; ulong shadow_msr; - ulong sprg4; - ulong sprg5; - ulong sprg6; - ulong sprg7; ulong csrr0; ulong csrr1; ulong dsrr0; @@ -329,7 +325,6 @@ struct kvm_vcpu_arch { ulong mcsrr0; ulong mcsrr1; ulong mcsr; - ulong esr; u32 dec; u32 decar; u32 tbl; @@ -338,7 +333,6 @@ struct kvm_vcpu_arch { u32 tsr; u32 ivor[64]; ulong ivpr; - u32 pir; u32 pvr; u32 shadow_pid; diff --git a/arch/powerpc/include/asm/kvm_para.h b/arch/powerpc/include/asm/kvm_para.h index 50533f9adf4..ece70fb3651 100644 --- a/arch/powerpc/include/asm/kvm_para.h +++ b/arch/powerpc/include/asm/kvm_para.h @@ -33,11 +33,35 @@ struct kvm_vcpu_arch_shared { __u64 sprg3; __u64 srr0; __u64 srr1; - __u64 dar; + __u64 dar; /* dear on BookE */ __u64 msr; __u32 dsisr; __u32 int_pending; /* Tells the guest if we have an interrupt */ __u32 sr[16]; + __u32 mas0; + __u32 mas1; + __u64 mas7_3; + __u64 mas2; + __u32 mas4; + __u32 mas6; + __u32 esr; + __u32 pir; + + /* + * SPRG4-7 are user-readable, so we can only keep these consistent + * between the shared area and the real registers when there's an + * intervening exit to KVM. This also applies to SPRG3 on some + * chips. + * + * This suffices for access by guest userspace, since in PR-mode + * KVM, an exit must occur when changing the guest's MSR[PR]. + * If the guest kernel writes to SPRG3-7 via the shared area, it + * must also use the shared area for reading while in kernel space. + */ + __u64 sprg4; + __u64 sprg5; + __u64 sprg6; + __u64 sprg7; }; #define KVM_SC_MAGIC_R0 0x4b564d21 /* "KVM!" */ @@ -47,7 +71,10 @@ struct kvm_vcpu_arch_shared { #define KVM_FEATURE_MAGIC_PAGE 1 -#define KVM_MAGIC_FEAT_SR (1 << 0) +#define KVM_MAGIC_FEAT_SR (1 << 0) + +/* MASn, ESR, PIR, and high SPRGs */ +#define KVM_MAGIC_FEAT_MAS0_TO_SPRG7 (1 << 1) #ifdef __KERNEL__ diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index 04caee7d9bc..e7bfcf81b74 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/arch/powerpc/kernel/asm-offsets.c @@ -426,16 +426,23 @@ int main(void) DEFINE(VCPU_SPRG2, offsetof(struct kvm_vcpu, arch.shregs.sprg2)); DEFINE(VCPU_SPRG3, offsetof(struct kvm_vcpu, arch.shregs.sprg3)); #endif - DEFINE(VCPU_SPRG4, offsetof(struct kvm_vcpu, arch.sprg4)); - DEFINE(VCPU_SPRG5, offsetof(struct kvm_vcpu, arch.sprg5)); - DEFINE(VCPU_SPRG6, offsetof(struct kvm_vcpu, arch.sprg6)); - DEFINE(VCPU_SPRG7, offsetof(struct kvm_vcpu, arch.sprg7)); + DEFINE(VCPU_SHARED_SPRG4, offsetof(struct kvm_vcpu_arch_shared, sprg4)); + DEFINE(VCPU_SHARED_SPRG5, offsetof(struct kvm_vcpu_arch_shared, sprg5)); + DEFINE(VCPU_SHARED_SPRG6, offsetof(struct kvm_vcpu_arch_shared, sprg6)); + DEFINE(VCPU_SHARED_SPRG7, offsetof(struct kvm_vcpu_arch_shared, sprg7)); DEFINE(VCPU_SHADOW_PID, offsetof(struct kvm_vcpu, arch.shadow_pid)); DEFINE(VCPU_SHADOW_PID1, offsetof(struct kvm_vcpu, arch.shadow_pid1)); DEFINE(VCPU_SHARED, offsetof(struct kvm_vcpu, arch.shared)); DEFINE(VCPU_SHARED_MSR, offsetof(struct kvm_vcpu_arch_shared, msr)); DEFINE(VCPU_SHADOW_MSR, offsetof(struct kvm_vcpu, arch.shadow_msr)); + DEFINE(VCPU_SHARED_MAS0, offsetof(struct kvm_vcpu_arch_shared, mas0)); + DEFINE(VCPU_SHARED_MAS1, offsetof(struct kvm_vcpu_arch_shared, mas1)); + DEFINE(VCPU_SHARED_MAS2, offsetof(struct kvm_vcpu_arch_shared, mas2)); + DEFINE(VCPU_SHARED_MAS7_3, offsetof(struct kvm_vcpu_arch_shared, mas7_3)); + DEFINE(VCPU_SHARED_MAS4, offsetof(struct kvm_vcpu_arch_shared, mas4)); + DEFINE(VCPU_SHARED_MAS6, offsetof(struct kvm_vcpu_arch_shared, mas6)); + /* book3s */ #ifdef CONFIG_KVM_BOOK3S_64_HV DEFINE(KVM_LPID, offsetof(struct kvm, arch.lpid)); diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c index 06b15ee997f..04d4b5aa6dc 100644 --- a/arch/powerpc/kernel/kvm.c +++ b/arch/powerpc/kernel/kvm.c @@ -49,23 +49,17 @@ #define KVM_RT_30 0x03c00000 #define KVM_MASK_RB 0x0000f800 #define KVM_INST_MFMSR 0x7c0000a6 -#define KVM_INST_MFSPR_SPRG0 0x7c1042a6 -#define KVM_INST_MFSPR_SPRG1 0x7c1142a6 -#define KVM_INST_MFSPR_SPRG2 0x7c1242a6 -#define KVM_INST_MFSPR_SPRG3 0x7c1342a6 -#define KVM_INST_MFSPR_SRR0 0x7c1a02a6 -#define KVM_INST_MFSPR_SRR1 0x7c1b02a6 -#define KVM_INST_MFSPR_DAR 0x7c1302a6 -#define KVM_INST_MFSPR_DSISR 0x7c1202a6 - -#define KVM_INST_MTSPR_SPRG0 0x7c1043a6 -#define KVM_INST_MTSPR_SPRG1 0x7c1143a6 -#define KVM_INST_MTSPR_SPRG2 0x7c1243a6 -#define KVM_INST_MTSPR_SPRG3 0x7c1343a6 -#define KVM_INST_MTSPR_SRR0 0x7c1a03a6 -#define KVM_INST_MTSPR_SRR1 0x7c1b03a6 -#define KVM_INST_MTSPR_DAR 0x7c1303a6 -#define KVM_INST_MTSPR_DSISR 0x7c1203a6 + +#define SPR_FROM 0 +#define SPR_TO 0x100 + +#define KVM_INST_SPR(sprn, moveto) (0x7c0002a6 | \ + (((sprn) & 0x1f) << 16) | \ + (((sprn) & 0x3e0) << 6) | \ + (moveto)) + +#define KVM_INST_MFSPR(sprn) KVM_INST_SPR(sprn, SPR_FROM) +#define KVM_INST_MTSPR(sprn) KVM_INST_SPR(sprn, SPR_TO) #define KVM_INST_TLBSYNC 0x7c00046c #define KVM_INST_MTMSRD_L0 0x7c000164 @@ -440,56 +434,191 @@ static void kvm_check_ins(u32 *inst, u32 features) case KVM_INST_MFMSR: kvm_patch_ins_ld(inst, magic_var(msr), inst_rt); break; - case KVM_INST_MFSPR_SPRG0: + case KVM_INST_MFSPR(SPRN_SPRG0): kvm_patch_ins_ld(inst, magic_var(sprg0), inst_rt); break; - case KVM_INST_MFSPR_SPRG1: + case KVM_INST_MFSPR(SPRN_SPRG1): kvm_patch_ins_ld(inst, magic_var(sprg1), inst_rt); break; - case KVM_INST_MFSPR_SPRG2: + case KVM_INST_MFSPR(SPRN_SPRG2): kvm_patch_ins_ld(inst, magic_var(sprg2), inst_rt); break; - case KVM_INST_MFSPR_SPRG3: + case KVM_INST_MFSPR(SPRN_SPRG3): kvm_patch_ins_ld(inst, magic_var(sprg3), inst_rt); break; - case KVM_INST_MFSPR_SRR0: + case KVM_INST_MFSPR(SPRN_SRR0): kvm_patch_ins_ld(inst, magic_var(srr0), inst_rt); break; - case KVM_INST_MFSPR_SRR1: + case KVM_INST_MFSPR(SPRN_SRR1): kvm_patch_ins_ld(inst, magic_var(srr1), inst_rt); break; - case KVM_INST_MFSPR_DAR: +#ifdef CONFIG_BOOKE + case KVM_INST_MFSPR(SPRN_DEAR): +#else + case KVM_INST_MFSPR(SPRN_DAR): +#endif kvm_patch_ins_ld(inst, magic_var(dar), inst_rt); break; - case KVM_INST_MFSPR_DSISR: + case KVM_INST_MFSPR(SPRN_DSISR): kvm_patch_ins_lwz(inst, magic_var(dsisr), inst_rt); break; +#ifdef CONFIG_PPC_BOOK3E_MMU + case KVM_INST_MFSPR(SPRN_MAS0): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_lwz(inst, magic_var(mas0), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_MAS1): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_lwz(inst, magic_var(mas1), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_MAS2): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_ld(inst, magic_var(mas2), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_MAS3): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_lwz(inst, magic_var(mas7_3) + 4, inst_rt); + break; + case KVM_INST_MFSPR(SPRN_MAS4): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_lwz(inst, magic_var(mas4), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_MAS6): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_lwz(inst, magic_var(mas6), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_MAS7): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_lwz(inst, magic_var(mas7_3), inst_rt); + break; +#endif /* CONFIG_PPC_BOOK3E_MMU */ + + case KVM_INST_MFSPR(SPRN_SPRG4): +#ifdef CONFIG_BOOKE + case KVM_INST_MFSPR(SPRN_SPRG4R): +#endif + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_ld(inst, magic_var(sprg4), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_SPRG5): +#ifdef CONFIG_BOOKE + case KVM_INST_MFSPR(SPRN_SPRG5R): +#endif + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_ld(inst, magic_var(sprg5), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_SPRG6): +#ifdef CONFIG_BOOKE + case KVM_INST_MFSPR(SPRN_SPRG6R): +#endif + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_ld(inst, magic_var(sprg6), inst_rt); + break; + case KVM_INST_MFSPR(SPRN_SPRG7): +#ifdef CONFIG_BOOKE + case KVM_INST_MFSPR(SPRN_SPRG7R): +#endif + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_ld(inst, magic_var(sprg7), inst_rt); + break; + +#ifdef CONFIG_BOOKE + case KVM_INST_MFSPR(SPRN_ESR): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_lwz(inst, magic_var(esr), inst_rt); + break; +#endif + + case KVM_INST_MFSPR(SPRN_PIR): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_lwz(inst, magic_var(pir), inst_rt); + break; + + /* Stores */ - case KVM_INST_MTSPR_SPRG0: + case KVM_INST_MTSPR(SPRN_SPRG0): kvm_patch_ins_std(inst, magic_var(sprg0), inst_rt); break; - case KVM_INST_MTSPR_SPRG1: + case KVM_INST_MTSPR(SPRN_SPRG1): kvm_patch_ins_std(inst, magic_var(sprg1), inst_rt); break; - case KVM_INST_MTSPR_SPRG2: + case KVM_INST_MTSPR(SPRN_SPRG2): kvm_patch_ins_std(inst, magic_var(sprg2), inst_rt); break; - case KVM_INST_MTSPR_SPRG3: + case KVM_INST_MTSPR(SPRN_SPRG3): kvm_patch_ins_std(inst, magic_var(sprg3), inst_rt); break; - case KVM_INST_MTSPR_SRR0: + case KVM_INST_MTSPR(SPRN_SRR0): kvm_patch_ins_std(inst, magic_var(srr0), inst_rt); break; - case KVM_INST_MTSPR_SRR1: + case KVM_INST_MTSPR(SPRN_SRR1): kvm_patch_ins_std(inst, magic_var(srr1), inst_rt); break; - case KVM_INST_MTSPR_DAR: +#ifdef CONFIG_BOOKE + case KVM_INST_MTSPR(SPRN_DEAR): +#else + case KVM_INST_MTSPR(SPRN_DAR): +#endif kvm_patch_ins_std(inst, magic_var(dar), inst_rt); break; - case KVM_INST_MTSPR_DSISR: + case KVM_INST_MTSPR(SPRN_DSISR): kvm_patch_ins_stw(inst, magic_var(dsisr), inst_rt); break; +#ifdef CONFIG_PPC_BOOK3E_MMU + case KVM_INST_MTSPR(SPRN_MAS0): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_stw(inst, magic_var(mas0), inst_rt); + break; + case KVM_INST_MTSPR(SPRN_MAS1): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_stw(inst, magic_var(mas1), inst_rt); + break; + case KVM_INST_MTSPR(SPRN_MAS2): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_std(inst, magic_var(mas2), inst_rt); + break; + case KVM_INST_MTSPR(SPRN_MAS3): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_stw(inst, magic_var(mas7_3) + 4, inst_rt); + break; + case KVM_INST_MTSPR(SPRN_MAS4): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_stw(inst, magic_var(mas4), inst_rt); + break; + case KVM_INST_MTSPR(SPRN_MAS6): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_stw(inst, magic_var(mas6), inst_rt); + break; + case KVM_INST_MTSPR(SPRN_MAS7): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_stw(inst, magic_var(mas7_3), inst_rt); + break; +#endif /* CONFIG_PPC_BOOK3E_MMU */ + + case KVM_INST_MTSPR(SPRN_SPRG4): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_std(inst, magic_var(sprg4), inst_rt); + break; + case KVM_INST_MTSPR(SPRN_SPRG5): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_std(inst, magic_var(sprg5), inst_rt); + break; + case KVM_INST_MTSPR(SPRN_SPRG6): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_std(inst, magic_var(sprg6), inst_rt); + break; + case KVM_INST_MTSPR(SPRN_SPRG7): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_std(inst, magic_var(sprg7), inst_rt); + break; + +#ifdef CONFIG_BOOKE + case KVM_INST_MTSPR(SPRN_ESR): + if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7) + kvm_patch_ins_stw(inst, magic_var(esr), inst_rt); + break; +#endif /* Nops */ case KVM_INST_TLBSYNC: @@ -556,9 +685,18 @@ static void kvm_use_magic_page(void) start = (void*)_stext; end = (void*)_etext; + /* + * Being interrupted in the middle of patching would + * be bad for SPRG4-7, which KVM can't keep in sync + * with emulated accesses because reads don't trap. + */ + local_irq_disable(); + for (p = start; p < end; p++) kvm_check_ins(p, features); + local_irq_enable(); + printk(KERN_INFO "KVM: Live patching for a fast VM %s\n", kvm_patching_worked ? "worked" : "failed"); } diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c index 73fc9f04610..5398744cd77 100644 --- a/arch/powerpc/kvm/book3s.c +++ b/arch/powerpc/kvm/book3s.c @@ -423,10 +423,10 @@ int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) regs->sprg1 = vcpu->arch.shared->sprg1; regs->sprg2 = vcpu->arch.shared->sprg2; regs->sprg3 = vcpu->arch.shared->sprg3; - regs->sprg4 = vcpu->arch.sprg4; - regs->sprg5 = vcpu->arch.sprg5; - regs->sprg6 = vcpu->arch.sprg6; - regs->sprg7 = vcpu->arch.sprg7; + regs->sprg4 = vcpu->arch.shared->sprg4; + regs->sprg5 = vcpu->arch.shared->sprg5; + regs->sprg6 = vcpu->arch.shared->sprg6; + regs->sprg7 = vcpu->arch.shared->sprg7; for (i = 0; i < ARRAY_SIZE(regs->gpr); i++) regs->gpr[i] = kvmppc_get_gpr(vcpu, i); @@ -450,10 +450,10 @@ int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) vcpu->arch.shared->sprg1 = regs->sprg1; vcpu->arch.shared->sprg2 = regs->sprg2; vcpu->arch.shared->sprg3 = regs->sprg3; - vcpu->arch.sprg4 = regs->sprg4; - vcpu->arch.sprg5 = regs->sprg5; - vcpu->arch.sprg6 = regs->sprg6; - vcpu->arch.sprg7 = regs->sprg7; + vcpu->arch.shared->sprg4 = regs->sprg4; + vcpu->arch.shared->sprg5 = regs->sprg5; + vcpu->arch.shared->sprg6 = regs->sprg6; + vcpu->arch.shared->sprg7 = regs->sprg7; for (i = 0; i < ARRAY_SIZE(regs->gpr); i++) kvmppc_set_gpr(vcpu, i, regs->gpr[i]); diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index 8dfc59a8a71..50803dd0b8f 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -270,7 +270,7 @@ static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu, vcpu->arch.shared->srr1 = vcpu->arch.shared->msr; vcpu->arch.pc = vcpu->arch.ivpr | vcpu->arch.ivor[priority]; if (update_esr == true) - vcpu->arch.esr = vcpu->arch.queued_esr; + vcpu->arch.shared->esr = vcpu->arch.queued_esr; if (update_dear == true) vcpu->arch.shared->dar = vcpu->arch.queued_dear; kvmppc_set_msr(vcpu, vcpu->arch.shared->msr & msr_mask); @@ -644,6 +644,7 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) vcpu->arch.pc = 0; vcpu->arch.shared->msr = 0; vcpu->arch.shadow_msr = MSR_USER | MSR_DE | MSR_IS | MSR_DS; + vcpu->arch.shared->pir = vcpu->vcpu_id; kvmppc_set_gpr(vcpu, 1, (16<<20) - 8); /* -8 for the callee-save LR slot */ vcpu->arch.shadow_pid = 1; @@ -678,10 +679,10 @@ int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) regs->sprg1 = vcpu->arch.shared->sprg1; regs->sprg2 = vcpu->arch.shared->sprg2; regs->sprg3 = vcpu->arch.shared->sprg3; - regs->sprg4 = vcpu->arch.sprg4; - regs->sprg5 = vcpu->arch.sprg5; - regs->sprg6 = vcpu->arch.sprg6; - regs->sprg7 = vcpu->arch.sprg7; + regs->sprg4 = vcpu->arch.shared->sprg4; + regs->sprg5 = vcpu->arch.shared->sprg5; + regs->sprg6 = vcpu->arch.shared->sprg6; + regs->sprg7 = vcpu->arch.shared->sprg7; for (i = 0; i < ARRAY_SIZE(regs->gpr); i++) regs->gpr[i] = kvmppc_get_gpr(vcpu, i); @@ -706,10 +707,10 @@ int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) vcpu->arch.shared->sprg1 = regs->sprg1; vcpu->arch.shared->sprg2 = regs->sprg2; vcpu->arch.shared->sprg3 = regs->sprg3; - vcpu->arch.sprg4 = regs->sprg4; - vcpu->arch.sprg5 = regs->sprg5; - vcpu->arch.sprg6 = regs->sprg6; - vcpu->arch.sprg7 = regs->sprg7; + vcpu->arch.shared->sprg4 = regs->sprg4; + vcpu->arch.shared->sprg5 = regs->sprg5; + vcpu->arch.shared->sprg6 = regs->sprg6; + vcpu->arch.shared->sprg7 = regs->sprg7; for (i = 0; i < ARRAY_SIZE(regs->gpr); i++) kvmppc_set_gpr(vcpu, i, regs->gpr[i]); @@ -727,7 +728,7 @@ static void get_sregs_base(struct kvm_vcpu *vcpu, sregs->u.e.csrr0 = vcpu->arch.csrr0; sregs->u.e.csrr1 = vcpu->arch.csrr1; sregs->u.e.mcsr = vcpu->arch.mcsr; - sregs->u.e.esr = vcpu->arch.esr; + sregs->u.e.esr = vcpu->arch.shared->esr; sregs->u.e.dear = vcpu->arch.shared->dar; sregs->u.e.tsr = vcpu->arch.tsr; sregs->u.e.tcr = vcpu->arch.tcr; @@ -745,7 +746,7 @@ static int set_sregs_base(struct kvm_vcpu *vcpu, vcpu->arch.csrr0 = sregs->u.e.csrr0; vcpu->arch.csrr1 = sregs->u.e.csrr1; vcpu->arch.mcsr = sregs->u.e.mcsr; - vcpu->arch.esr = sregs->u.e.esr; + vcpu->arch.shared->esr = sregs->u.e.esr; vcpu->arch.shared->dar = sregs->u.e.dear; vcpu->arch.vrsave = sregs->u.e.vrsave; vcpu->arch.tcr = sregs->u.e.tcr; diff --git a/arch/powerpc/kvm/booke_emulate.c b/arch/powerpc/kvm/booke_emulate.c index 1260f5f24c0..bae9288ac1e 100644 --- a/arch/powerpc/kvm/booke_emulate.c +++ b/arch/powerpc/kvm/booke_emulate.c @@ -107,7 +107,7 @@ int kvmppc_booke_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs) case SPRN_DEAR: vcpu->arch.shared->dar = spr_val; break; case SPRN_ESR: - vcpu->arch.esr = spr_val; break; + vcpu->arch.shared->esr = spr_val; break; case SPRN_DBCR0: vcpu->arch.dbcr0 = spr_val; break; case SPRN_DBCR1: @@ -125,13 +125,13 @@ int kvmppc_booke_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs) * loaded into the real SPRGs when resuming the * guest. */ case SPRN_SPRG4: - vcpu->arch.sprg4 = spr_val; break; + vcpu->arch.shared->sprg4 = spr_val; break; case SPRN_SPRG5: - vcpu->arch.sprg5 = spr_val; break; + vcpu->arch.shared->sprg5 = spr_val; break; case SPRN_SPRG6: - vcpu->arch.sprg6 = spr_val; break; + vcpu->arch.shared->sprg6 = spr_val; break; case SPRN_SPRG7: - vcpu->arch.sprg7 = spr_val; break; + vcpu->arch.shared->sprg7 = spr_val; break; case SPRN_IVPR: vcpu->arch.ivpr = spr_val; @@ -202,7 +202,7 @@ int kvmppc_booke_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt) case SPRN_DEAR: kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->dar); break; case SPRN_ESR: - kvmppc_set_gpr(vcpu, rt, vcpu->arch.esr); break; + kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->esr); break; case SPRN_DBCR0: kvmppc_set_gpr(vcpu, rt, vcpu->arch.dbcr0); break; case SPRN_DBCR1: diff --git a/arch/powerpc/kvm/booke_interrupts.S b/arch/powerpc/kvm/booke_interrupts.S index 42f2fb1f66e..10d8ef602e5 100644 --- a/arch/powerpc/kvm/booke_interrupts.S +++ b/arch/powerpc/kvm/booke_interrupts.S @@ -402,19 +402,25 @@ lightweight_exit: /* Save vcpu pointer for the exception handlers. */ mtspr SPRN_SPRG_WVCPU, r4 + lwz r5, VCPU_SHARED(r4) + /* Can't switch the stack pointer until after IVPR is switched, * because host interrupt handlers would get confused. */ lwz r1, VCPU_GPR(r1)(r4) - /* Host interrupt handlers may have clobbered these guest-readable - * SPRGs, so we need to reload them here with the guest's values. */ - lwz r3, VCPU_SPRG4(r4) + /* + * Host interrupt handlers may have clobbered these + * guest-readable SPRGs, or the guest kernel may have + * written directly to the shared area, so we + * need to reload them here with the guest's values. + */ + lwz r3, VCPU_SHARED_SPRG4(r5) mtspr SPRN_SPRG4W, r3 - lwz r3, VCPU_SPRG5(r4) + lwz r3, VCPU_SHARED_SPRG5(r5) mtspr SPRN_SPRG5W, r3 - lwz r3, VCPU_SPRG6(r4) + lwz r3, VCPU_SHARED_SPRG6(r5) mtspr SPRN_SPRG6W, r3 - lwz r3, VCPU_SPRG7(r4) + lwz r3, VCPU_SHARED_SPRG7(r5) mtspr SPRN_SPRG7W, r3 #ifdef CONFIG_KVM_EXIT_TIMING diff --git a/arch/powerpc/kvm/e500.c b/arch/powerpc/kvm/e500.c index ac3c4bf2167..709d82f956e 100644 --- a/arch/powerpc/kvm/e500.c +++ b/arch/powerpc/kvm/e500.c @@ -115,12 +115,12 @@ void kvmppc_core_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) sregs->u.e.impl.fsl.hid0 = vcpu_e500->hid0; sregs->u.e.impl.fsl.mcar = vcpu_e500->mcar; - sregs->u.e.mas0 = vcpu_e500->mas0; - sregs->u.e.mas1 = vcpu_e500->mas1; - sregs->u.e.mas2 = vcpu_e500->mas2; - sregs->u.e.mas7_3 = vcpu_e500->mas7_3; - sregs->u.e.mas4 = vcpu_e500->mas4; - sregs->u.e.mas6 = vcpu_e500->mas6; + sregs->u.e.mas0 = vcpu->arch.shared->mas0; + sregs->u.e.mas1 = vcpu->arch.shared->mas1; + sregs->u.e.mas2 = vcpu->arch.shared->mas2; + sregs->u.e.mas7_3 = vcpu->arch.shared->mas7_3; + sregs->u.e.mas4 = vcpu->arch.shared->mas4; + sregs->u.e.mas6 = vcpu->arch.shared->mas6; sregs->u.e.mmucfg = mfspr(SPRN_MMUCFG); sregs->u.e.tlbcfg[0] = vcpu_e500->tlb0cfg; @@ -148,12 +148,12 @@ int kvmppc_core_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs) } if (sregs->u.e.features & KVM_SREGS_E_ARCH206_MMU) { - vcpu_e500->mas0 = sregs->u.e.mas0; - vcpu_e500->mas1 = sregs->u.e.mas1; - vcpu_e500->mas2 = sregs->u.e.mas2; - vcpu_e500->mas7_3 = sregs->u.e.mas7_3; - vcpu_e500->mas4 = sregs->u.e.mas4; - vcpu_e500->mas6 = sregs->u.e.mas6; + vcpu->arch.shared->mas0 = sregs->u.e.mas0; + vcpu->arch.shared->mas1 = sregs->u.e.mas1; + vcpu->arch.shared->mas2 = sregs->u.e.mas2; + vcpu->arch.shared->mas7_3 = sregs->u.e.mas7_3; + vcpu->arch.shared->mas4 = sregs->u.e.mas4; + vcpu->arch.shared->mas6 = sregs->u.e.mas6; } if (!(sregs->u.e.features & KVM_SREGS_E_IVOR)) diff --git a/arch/powerpc/kvm/e500_emulate.c b/arch/powerpc/kvm/e500_emulate.c index e0d36099c75..6d0b2bd54fb 100644 --- a/arch/powerpc/kvm/e500_emulate.c +++ b/arch/powerpc/kvm/e500_emulate.c @@ -89,22 +89,22 @@ int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs) return EMULATE_FAIL; vcpu_e500->pid[2] = spr_val; break; case SPRN_MAS0: - vcpu_e500->mas0 = spr_val; break; + vcpu->arch.shared->mas0 = spr_val; break; case SPRN_MAS1: - vcpu_e500->mas1 = spr_val; break; + vcpu->arch.shared->mas1 = spr_val; break; case SPRN_MAS2: - vcpu_e500->mas2 = spr_val; break; + vcpu->arch.shared->mas2 = spr_val; break; case SPRN_MAS3: - vcpu_e500->mas7_3 &= ~(u64)0xffffffff; - vcpu_e500->mas7_3 |= spr_val; + vcpu->arch.shared->mas7_3 &= ~(u64)0xffffffff; + vcpu->arch.shared->mas7_3 |= spr_val; break; case SPRN_MAS4: - vcpu_e500->mas4 = spr_val; break; + vcpu->arch.shared->mas4 = spr_val; break; case SPRN_MAS6: - vcpu_e500->mas6 = spr_val; break; + vcpu->arch.shared->mas6 = spr_val; break; case SPRN_MAS7: - vcpu_e500->mas7_3 &= (u64)0xffffffff; - vcpu_e500->mas7_3 |= (u64)spr_val << 32; + vcpu->arch.shared->mas7_3 &= (u64)0xffffffff; + vcpu->arch.shared->mas7_3 |= (u64)spr_val << 32; break; case SPRN_L1CSR0: vcpu_e500->l1csr0 = spr_val; @@ -147,6 +147,7 @@ int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt) { struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu); int emulated = EMULATE_DONE; + unsigned long val; switch (sprn) { case SPRN_PID: @@ -156,20 +157,23 @@ int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt) case SPRN_PID2: kvmppc_set_gpr(vcpu, rt, vcpu_e500->pid[2]); break; case SPRN_MAS0: - kvmppc_set_gpr(vcpu, rt, vcpu_e500->mas0); break; + kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->mas0); break; case SPRN_MAS1: - kvmppc_set_gpr(vcpu, rt, vcpu_e500->mas1); break; + kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->mas1); break; case SPRN_MAS2: - kvmppc_set_gpr(vcpu, rt, vcpu_e500->mas2); break; + kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->mas2); break; case SPRN_MAS3: - kvmppc_set_gpr(vcpu, rt, (u32)vcpu_e500->mas7_3); break; + val = (u32)vcpu->arch.shared->mas7_3; + kvmppc_set_gpr(vcpu, rt, val); + break; case SPRN_MAS4: - kvmppc_set_gpr(vcpu, rt, vcpu_e500->mas4); break; + kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->mas4); break; case SPRN_MAS6: - kvmppc_set_gpr(vcpu, rt, vcpu_e500->mas6); break; + kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->mas6); break; case SPRN_MAS7: - kvmppc_set_gpr(vcpu, rt, vcpu_e500->mas7_3 >> 32); break; - + val = vcpu->arch.shared->mas7_3 >> 32; + kvmppc_set_gpr(vcpu, rt, val); + break; case SPRN_TLB0CFG: kvmppc_set_gpr(vcpu, rt, vcpu_e500->tlb0cfg); break; case SPRN_TLB1CFG: diff --git a/arch/powerpc/kvm/e500_tlb.c b/arch/powerpc/kvm/e500_tlb.c index 6fefb9144f2..9cd124a11ac 100644 --- a/arch/powerpc/kvm/e500_tlb.c +++ b/arch/powerpc/kvm/e500_tlb.c @@ -428,13 +428,14 @@ static int htlb0_set_base(gva_t addr) host_tlb_params[0].ways); } -static unsigned int get_tlb_esel(struct kvmppc_vcpu_e500 *vcpu_e500, int tlbsel) +static unsigned int get_tlb_esel(struct kvm_vcpu *vcpu, int tlbsel) { - unsigned int esel = get_tlb_esel_bit(vcpu_e500); + struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu); + int esel = get_tlb_esel_bit(vcpu); if (tlbsel == 0) { esel &= vcpu_e500->gtlb_params[0].ways - 1; - esel += gtlb0_set_base(vcpu_e500, vcpu_e500->mas2); + esel += gtlb0_set_base(vcpu_e500, vcpu->arch.shared->mas2); } else { esel &= vcpu_e500->gtlb_params[tlbsel].entries - 1; } @@ -545,20 +546,20 @@ static inline void kvmppc_e500_deliver_tlb_miss(struct kvm_vcpu *vcpu, int tlbsel; /* since we only have two TLBs, only lower bit is used. */ - tlbsel = (vcpu_e500->mas4 >> 28) & 0x1; + tlbsel = (vcpu->arch.shared->mas4 >> 28) & 0x1; victim = (tlbsel == 0) ? gtlb0_get_next_victim(vcpu_e500) : 0; - pidsel = (vcpu_e500->mas4 >> 16) & 0xf; - tsized = (vcpu_e500->mas4 >> 7) & 0x1f; + pidsel = (vcpu->arch.shared->mas4 >> 16) & 0xf; + tsized = (vcpu->arch.shared->mas4 >> 7) & 0x1f; - vcpu_e500->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(victim) + vcpu->arch.shared->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(victim) | MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]); - vcpu_e500->mas1 = MAS1_VALID | (as ? MAS1_TS : 0) + vcpu->arch.shared->mas1 = MAS1_VALID | (as ? MAS1_TS : 0) | MAS1_TID(vcpu_e500->pid[pidsel]) | MAS1_TSIZE(tsized); - vcpu_e500->mas2 = (eaddr & MAS2_EPN) - | (vcpu_e500->mas4 & MAS2_ATTRIB_MASK); - vcpu_e500->mas7_3 &= MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3; - vcpu_e500->mas6 = (vcpu_e500->mas6 & MAS6_SPID1) + vcpu->arch.shared->mas2 = (eaddr & MAS2_EPN) + | (vcpu->arch.shared->mas4 & MAS2_ATTRIB_MASK); + vcpu->arch.shared->mas7_3 &= MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3; + vcpu->arch.shared->mas6 = (vcpu->arch.shared->mas6 & MAS6_SPID1) | (get_cur_pid(vcpu) << 16) | (as ? MAS6_SAS : 0); } @@ -844,15 +845,15 @@ int kvmppc_e500_emul_tlbre(struct kvm_vcpu *vcpu) int tlbsel, esel; struct kvm_book3e_206_tlb_entry *gtlbe; - tlbsel = get_tlb_tlbsel(vcpu_e500); - esel = get_tlb_esel(vcpu_e500, tlbsel); + tlbsel = get_tlb_tlbsel(vcpu); + esel = get_tlb_esel(vcpu, tlbsel); gtlbe = get_entry(vcpu_e500, tlbsel, esel); - vcpu_e500->mas0 &= ~MAS0_NV(~0); - vcpu_e500->mas0 |= MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]); - vcpu_e500->mas1 = gtlbe->mas1; - vcpu_e500->mas2 = gtlbe->mas2; - vcpu_e500->mas7_3 = gtlbe->mas7_3; + vcpu->arch.shared->mas0 &= ~MAS0_NV(~0); + vcpu->arch.shared->mas0 |= MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]); + vcpu->arch.shared->mas1 = gtlbe->mas1; + vcpu->arch.shared->mas2 = gtlbe->mas2; + vcpu->arch.shared->mas7_3 = gtlbe->mas7_3; return EMULATE_DONE; } @@ -860,8 +861,8 @@ int kvmppc_e500_emul_tlbre(struct kvm_vcpu *vcpu) int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, int rb) { struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu); - int as = !!get_cur_sas(vcpu_e500); - unsigned int pid = get_cur_spid(vcpu_e500); + int as = !!get_cur_sas(vcpu); + unsigned int pid = get_cur_spid(vcpu); int esel, tlbsel; struct kvm_book3e_206_tlb_entry *gtlbe = NULL; gva_t ea; @@ -879,26 +880,30 @@ int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, int rb) if (gtlbe) { esel &= vcpu_e500->gtlb_params[tlbsel].ways - 1; - vcpu_e500->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(esel) + vcpu->arch.shared->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(esel) | MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]); - vcpu_e500->mas1 = gtlbe->mas1; - vcpu_e500->mas2 = gtlbe->mas2; - vcpu_e500->mas7_3 = gtlbe->mas7_3; + vcpu->arch.shared->mas1 = gtlbe->mas1; + vcpu->arch.shared->mas2 = gtlbe->mas2; + vcpu->arch.shared->mas7_3 = gtlbe->mas7_3; } else { int victim; /* since we only have two TLBs, only lower bit is used. */ - tlbsel = vcpu_e500->mas4 >> 28 & 0x1; + tlbsel = vcpu->arch.shared->mas4 >> 28 & 0x1; victim = (tlbsel == 0) ? gtlb0_get_next_victim(vcpu_e500) : 0; - vcpu_e500->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(victim) + vcpu->arch.shared->mas0 = MAS0_TLBSEL(tlbsel) + | MAS0_ESEL(victim) | MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]); - vcpu_e500->mas1 = (vcpu_e500->mas6 & MAS6_SPID0) - | (vcpu_e500->mas6 & (MAS6_SAS ? MAS1_TS : 0)) - | (vcpu_e500->mas4 & MAS4_TSIZED(~0)); - vcpu_e500->mas2 &= MAS2_EPN; - vcpu_e500->mas2 |= vcpu_e500->mas4 & MAS2_ATTRIB_MASK; - vcpu_e500->mas7_3 &= MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3; + vcpu->arch.shared->mas1 = + (vcpu->arch.shared->mas6 & MAS6_SPID0) + | (vcpu->arch.shared->mas6 & (MAS6_SAS ? MAS1_TS : 0)) + | (vcpu->arch.shared->mas4 & MAS4_TSIZED(~0)); + vcpu->arch.shared->mas2 &= MAS2_EPN; + vcpu->arch.shared->mas2 |= vcpu->arch.shared->mas4 & + MAS2_ATTRIB_MASK; + vcpu->arch.shared->mas7_3 &= MAS3_U0 | MAS3_U1 | + MAS3_U2 | MAS3_U3; } kvmppc_set_exit_type(vcpu, EMULATED_TLBSX_EXITS); @@ -929,19 +934,19 @@ int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu) struct kvm_book3e_206_tlb_entry *gtlbe; int tlbsel, esel; - tlbsel = get_tlb_tlbsel(vcpu_e500); - esel = get_tlb_esel(vcpu_e500, tlbsel); + tlbsel = get_tlb_tlbsel(vcpu); + esel = get_tlb_esel(vcpu, tlbsel); gtlbe = get_entry(vcpu_e500, tlbsel, esel); if (get_tlb_v(gtlbe)) inval_gtlbe_on_host(vcpu_e500, tlbsel, esel); - gtlbe->mas1 = vcpu_e500->mas1; - gtlbe->mas2 = vcpu_e500->mas2; - gtlbe->mas7_3 = vcpu_e500->mas7_3; + gtlbe->mas1 = vcpu->arch.shared->mas1; + gtlbe->mas2 = vcpu->arch.shared->mas2; + gtlbe->mas7_3 = vcpu->arch.shared->mas7_3; - trace_kvm_gtlb_write(vcpu_e500->mas0, gtlbe->mas1, gtlbe->mas2, + trace_kvm_gtlb_write(vcpu->arch.shared->mas0, gtlbe->mas1, gtlbe->mas2, (u32)gtlbe->mas7_3, (u32)(gtlbe->mas7_3 >> 32)); /* Invalidate shadow mappings for the about-to-be-clobbered TLBE. */ diff --git a/arch/powerpc/kvm/e500_tlb.h b/arch/powerpc/kvm/e500_tlb.h index 2c296407e75..5c6d2d7bf05 100644 --- a/arch/powerpc/kvm/e500_tlb.h +++ b/arch/powerpc/kvm/e500_tlb.h @@ -121,38 +121,33 @@ static inline unsigned int get_cur_pr(struct kvm_vcpu *vcpu) return !!(vcpu->arch.shared->msr & MSR_PR); } -static inline unsigned int get_cur_spid( - const struct kvmppc_vcpu_e500 *vcpu_e500) +static inline unsigned int get_cur_spid(const struct kvm_vcpu *vcpu) { - return (vcpu_e500->mas6 >> 16) & 0xff; + return (vcpu->arch.shared->mas6 >> 16) & 0xff; } -static inline unsigned int get_cur_sas( - const struct kvmppc_vcpu_e500 *vcpu_e500) +static inline unsigned int get_cur_sas(const struct kvm_vcpu *vcpu) { - return vcpu_e500->mas6 & 0x1; + return vcpu->arch.shared->mas6 & 0x1; } -static inline unsigned int get_tlb_tlbsel( - const struct kvmppc_vcpu_e500 *vcpu_e500) +static inline unsigned int get_tlb_tlbsel(const struct kvm_vcpu *vcpu) { /* * Manual says that tlbsel has 2 bits wide. * Since we only have two TLBs, only lower bit is used. */ - return (vcpu_e500->mas0 >> 28) & 0x1; + return (vcpu->arch.shared->mas0 >> 28) & 0x1; } -static inline unsigned int get_tlb_nv_bit( - const struct kvmppc_vcpu_e500 *vcpu_e500) +static inline unsigned int get_tlb_nv_bit(const struct kvm_vcpu *vcpu) { - return vcpu_e500->mas0 & 0xfff; + return vcpu->arch.shared->mas0 & 0xfff; } -static inline unsigned int get_tlb_esel_bit( - const struct kvmppc_vcpu_e500 *vcpu_e500) +static inline unsigned int get_tlb_esel_bit(const struct kvm_vcpu *vcpu) { - return (vcpu_e500->mas0 >> 16) & 0xfff; + return (vcpu->arch.shared->mas0 >> 16) & 0xfff; } static inline int tlbe_is_host_safe(const struct kvm_vcpu *vcpu, diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c index b6df56dd93b..bda052e2264 100644 --- a/arch/powerpc/kvm/emulate.c +++ b/arch/powerpc/kvm/emulate.c @@ -162,7 +162,8 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu) case OP_TRAP_64: kvmppc_core_queue_program(vcpu, SRR1_PROGTRAP); #else - kvmppc_core_queue_program(vcpu, vcpu->arch.esr | ESR_PTR); + kvmppc_core_queue_program(vcpu, + vcpu->arch.shared->esr | ESR_PTR); #endif advance = 0; break; diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 7411bdd8ff6..d02e4c84e21 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -66,7 +66,7 @@ int kvmppc_kvm_pv(struct kvm_vcpu *vcpu) vcpu->arch.magic_page_pa = param1; vcpu->arch.magic_page_ea = param2; - r2 = KVM_MAGIC_FEAT_SR; + r2 = KVM_MAGIC_FEAT_SR | KVM_MAGIC_FEAT_MAS0_TO_SPRG7; r = HC_EV_SUCCESS; break; -- cgit v1.2.3 From dfd4d47e9a71c5a35eb67a44cd311efbe1846b7e Mon Sep 17 00:00:00 2001 From: Scott Wood Date: Thu, 17 Nov 2011 12:39:59 +0000 Subject: KVM: PPC: booke: Improve timer register emulation Decrementers are now properly driven by TCR/TSR, and the guest has full read/write access to these registers. The decrementer keeps ticking (and setting the TSR bit) regardless of whether the interrupts are enabled with TCR. The decrementer stops at zero, rather than going negative. Decrementers (and FITs, once implemented) are delivered as level-triggered interrupts -- dequeued when the TSR bit is cleared, not on delivery. Signed-off-by: Liu Yu [scottwood@freescale.com: significant changes] Signed-off-by: Scott Wood Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_host.h | 2 +- arch/powerpc/include/asm/kvm_ppc.h | 1 + arch/powerpc/kvm/book3s.c | 8 +++++ arch/powerpc/kvm/booke.c | 67 ++++++++++++++++++++++++++++--------- arch/powerpc/kvm/booke.h | 4 +++ arch/powerpc/kvm/booke_emulate.c | 11 ++++-- arch/powerpc/kvm/emulate.c | 59 ++++++++++++++++---------------- arch/powerpc/kvm/powerpc.c | 33 +++++++----------- 8 files changed, 115 insertions(+), 70 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index bfd0c9912da..66c75cddaec 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -330,7 +330,7 @@ struct kvm_vcpu_arch { u32 tbl; u32 tbu; u32 tcr; - u32 tsr; + ulong tsr; /* we need to perform set/clr_bits() which requires ulong */ u32 ivor[64]; ulong ivpr; u32 pvr; diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h index c089927f64c..5192c2e7058 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -66,6 +66,7 @@ extern int kvmppc_emulate_instruction(struct kvm_run *run, extern int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu); extern void kvmppc_emulate_dec(struct kvm_vcpu *vcpu); extern u32 kvmppc_get_dec(struct kvm_vcpu *vcpu, u64 tb); +extern void kvmppc_decrementer_func(unsigned long data); extern int kvmppc_sanity_check(struct kvm_vcpu *vcpu); /* Core-specific hooks */ diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c index 5398744cd77..6bf7e0582c5 100644 --- a/arch/powerpc/kvm/book3s.c +++ b/arch/powerpc/kvm/book3s.c @@ -515,3 +515,11 @@ out: mutex_unlock(&kvm->slots_lock); return r; } + +void kvmppc_decrementer_func(unsigned long data) +{ + struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data; + + kvmppc_core_queue_dec(vcpu); + kvm_vcpu_kick(vcpu); +} diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index 50803dd0b8f..9e41f45d07e 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -252,9 +252,11 @@ static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu, allowed = vcpu->arch.shared->msr & MSR_ME; msr_mask = 0; break; - case BOOKE_IRQPRIO_EXTERNAL: case BOOKE_IRQPRIO_DECREMENTER: case BOOKE_IRQPRIO_FIT: + keep_irq = true; + /* fall through */ + case BOOKE_IRQPRIO_EXTERNAL: allowed = vcpu->arch.shared->msr & MSR_EE; allowed = allowed && !crit; msr_mask = MSR_CE|MSR_ME|MSR_DE; @@ -282,11 +284,26 @@ static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu, return allowed; } +static void update_timer_ints(struct kvm_vcpu *vcpu) +{ + if ((vcpu->arch.tcr & TCR_DIE) && (vcpu->arch.tsr & TSR_DIS)) + kvmppc_core_queue_dec(vcpu); + else + kvmppc_core_dequeue_dec(vcpu); +} + static void kvmppc_core_check_exceptions(struct kvm_vcpu *vcpu) { unsigned long *pending = &vcpu->arch.pending_exceptions; unsigned int priority; + if (vcpu->requests) { + if (kvm_check_request(KVM_REQ_PENDING_TIMER, vcpu)) { + smp_mb(); + update_timer_ints(vcpu); + } + } + priority = __ffs(*pending); while (priority <= BOOKE_IRQPRIO_MAX) { if (kvmppc_booke_irqprio_deliver(vcpu, priority)) @@ -749,25 +766,16 @@ static int set_sregs_base(struct kvm_vcpu *vcpu, vcpu->arch.shared->esr = sregs->u.e.esr; vcpu->arch.shared->dar = sregs->u.e.dear; vcpu->arch.vrsave = sregs->u.e.vrsave; - vcpu->arch.tcr = sregs->u.e.tcr; + kvmppc_set_tcr(vcpu, sregs->u.e.tcr); - if (sregs->u.e.update_special & KVM_SREGS_E_UPDATE_DEC) + if (sregs->u.e.update_special & KVM_SREGS_E_UPDATE_DEC) { vcpu->arch.dec = sregs->u.e.dec; - - kvmppc_emulate_dec(vcpu); + kvmppc_emulate_dec(vcpu); + } if (sregs->u.e.update_special & KVM_SREGS_E_UPDATE_TSR) { - /* - * FIXME: existing KVM timer handling is incomplete. - * TSR cannot be read by the guest, and its value in - * vcpu->arch is always zero. For now, just handle - * the case where the caller is trying to inject a - * decrementer interrupt. - */ - - if ((sregs->u.e.tsr & TSR_DIS) && - (vcpu->arch.tcr & TCR_DIE)) - kvmppc_core_queue_dec(vcpu); + vcpu->arch.tsr = sregs->u.e.tsr; + update_timer_ints(vcpu); } return 0; @@ -923,6 +931,33 @@ void kvmppc_core_destroy_vm(struct kvm *kvm) { } +void kvmppc_set_tcr(struct kvm_vcpu *vcpu, u32 new_tcr) +{ + vcpu->arch.tcr = new_tcr; + update_timer_ints(vcpu); +} + +void kvmppc_set_tsr_bits(struct kvm_vcpu *vcpu, u32 tsr_bits) +{ + set_bits(tsr_bits, &vcpu->arch.tsr); + smp_wmb(); + kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu); + kvm_vcpu_kick(vcpu); +} + +void kvmppc_clr_tsr_bits(struct kvm_vcpu *vcpu, u32 tsr_bits) +{ + clear_bits(tsr_bits, &vcpu->arch.tsr); + update_timer_ints(vcpu); +} + +void kvmppc_decrementer_func(unsigned long data) +{ + struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data; + + kvmppc_set_tsr_bits(vcpu, TSR_DIS); +} + int __init kvmppc_booke_init(void) { unsigned long ivor[16]; diff --git a/arch/powerpc/kvm/booke.h b/arch/powerpc/kvm/booke.h index 8e1fe33d64e..2fe202705a3 100644 --- a/arch/powerpc/kvm/booke.h +++ b/arch/powerpc/kvm/booke.h @@ -55,6 +55,10 @@ extern unsigned long kvmppc_booke_handlers; void kvmppc_set_msr(struct kvm_vcpu *vcpu, u32 new_msr); void kvmppc_mmu_msr_notify(struct kvm_vcpu *vcpu, u32 old_msr); +void kvmppc_set_tcr(struct kvm_vcpu *vcpu, u32 new_tcr); +void kvmppc_set_tsr_bits(struct kvm_vcpu *vcpu, u32 tsr_bits); +void kvmppc_clr_tsr_bits(struct kvm_vcpu *vcpu, u32 tsr_bits); + int kvmppc_booke_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu, unsigned int inst, int *advance); int kvmppc_booke_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt); diff --git a/arch/powerpc/kvm/booke_emulate.c b/arch/powerpc/kvm/booke_emulate.c index bae9288ac1e..3e652da3653 100644 --- a/arch/powerpc/kvm/booke_emulate.c +++ b/arch/powerpc/kvm/booke_emulate.c @@ -13,6 +13,7 @@ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * * Copyright IBM Corp. 2008 + * Copyright 2011 Freescale Semiconductor, Inc. * * Authors: Hollis Blanchard */ @@ -115,10 +116,10 @@ int kvmppc_booke_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs) case SPRN_DBSR: vcpu->arch.dbsr &= ~spr_val; break; case SPRN_TSR: - vcpu->arch.tsr &= ~spr_val; break; + kvmppc_clr_tsr_bits(vcpu, spr_val); + break; case SPRN_TCR: - vcpu->arch.tcr = spr_val; - kvmppc_emulate_dec(vcpu); + kvmppc_set_tcr(vcpu, spr_val); break; /* Note: SPRG4-7 are user-readable. These values are @@ -209,6 +210,10 @@ int kvmppc_booke_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt) kvmppc_set_gpr(vcpu, rt, vcpu->arch.dbcr1); break; case SPRN_DBSR: kvmppc_set_gpr(vcpu, rt, vcpu->arch.dbsr); break; + case SPRN_TSR: + kvmppc_set_gpr(vcpu, rt, vcpu->arch.tsr); break; + case SPRN_TCR: + kvmppc_set_gpr(vcpu, rt, vcpu->arch.tcr); break; case SPRN_IVOR0: kvmppc_set_gpr(vcpu, rt, vcpu->arch.ivor[BOOKE_IRQPRIO_CRITICAL]); diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c index bda052e2264..968f4010188 100644 --- a/arch/powerpc/kvm/emulate.c +++ b/arch/powerpc/kvm/emulate.c @@ -13,6 +13,7 @@ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * * Copyright IBM Corp. 2007 + * Copyright 2011 Freescale Semiconductor, Inc. * * Authors: Hollis Blanchard */ @@ -69,57 +70,55 @@ #define OP_STH 44 #define OP_STHU 45 -#ifdef CONFIG_PPC_BOOK3S -static int kvmppc_dec_enabled(struct kvm_vcpu *vcpu) -{ - return 1; -} -#else -static int kvmppc_dec_enabled(struct kvm_vcpu *vcpu) -{ - /* On BOOKE, DEC = 0 is as good as decrementer not enabled */ - return (vcpu->arch.tcr & TCR_DIE) && vcpu->arch.dec; -} -#endif - void kvmppc_emulate_dec(struct kvm_vcpu *vcpu) { unsigned long dec_nsec; unsigned long long dec_time; pr_debug("mtDEC: %x\n", vcpu->arch.dec); + hrtimer_try_to_cancel(&vcpu->arch.dec_timer); + #ifdef CONFIG_PPC_BOOK3S /* mtdec lowers the interrupt line when positive. */ kvmppc_core_dequeue_dec(vcpu); /* POWER4+ triggers a dec interrupt if the value is < 0 */ if (vcpu->arch.dec & 0x80000000) { - hrtimer_try_to_cancel(&vcpu->arch.dec_timer); kvmppc_core_queue_dec(vcpu); return; } #endif - if (kvmppc_dec_enabled(vcpu)) { - /* The decrementer ticks at the same rate as the timebase, so - * that's how we convert the guest DEC value to the number of - * host ticks. */ - - hrtimer_try_to_cancel(&vcpu->arch.dec_timer); - dec_time = vcpu->arch.dec; - dec_time *= 1000; - do_div(dec_time, tb_ticks_per_usec); - dec_nsec = do_div(dec_time, NSEC_PER_SEC); - hrtimer_start(&vcpu->arch.dec_timer, - ktime_set(dec_time, dec_nsec), HRTIMER_MODE_REL); - vcpu->arch.dec_jiffies = get_tb(); - } else { - hrtimer_try_to_cancel(&vcpu->arch.dec_timer); - } + +#ifdef CONFIG_BOOKE + /* On BOOKE, DEC = 0 is as good as decrementer not enabled */ + if (vcpu->arch.dec == 0) + return; +#endif + + /* + * The decrementer ticks at the same rate as the timebase, so + * that's how we convert the guest DEC value to the number of + * host ticks. + */ + + dec_time = vcpu->arch.dec; + dec_time *= 1000; + do_div(dec_time, tb_ticks_per_usec); + dec_nsec = do_div(dec_time, NSEC_PER_SEC); + hrtimer_start(&vcpu->arch.dec_timer, + ktime_set(dec_time, dec_nsec), HRTIMER_MODE_REL); + vcpu->arch.dec_jiffies = get_tb(); } u32 kvmppc_get_dec(struct kvm_vcpu *vcpu, u64 tb) { u64 jd = tb - vcpu->arch.dec_jiffies; + +#ifdef CONFIG_BOOKE + if (vcpu->arch.dec < jd) + return 0; +#endif + return vcpu->arch.dec - jd; } diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index d02e4c84e21..fd8d3b16eaf 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -39,7 +39,8 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *v) { return !(v->arch.shared->msr & MSR_WE) || - !!(v->arch.pending_exceptions); + !!(v->arch.pending_exceptions) || + v->requests; } int kvmppc_kvm_pv(struct kvm_vcpu *vcpu) @@ -311,18 +312,6 @@ int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) return kvmppc_core_pending_dec(vcpu); } -static void kvmppc_decrementer_func(unsigned long data) -{ - struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data; - - kvmppc_core_queue_dec(vcpu); - - if (waitqueue_active(vcpu->arch.wqp)) { - wake_up_interruptible(vcpu->arch.wqp); - vcpu->stat.halt_wakeup++; - } -} - /* * low level hrtimer wake routine. Because this runs in hardirq context * we schedule a tasklet to do the real work. @@ -567,6 +556,16 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) return r; } +void kvm_vcpu_kick(struct kvm_vcpu *vcpu) +{ + if (waitqueue_active(&vcpu->wq)) { + wake_up_interruptible(vcpu->arch.wqp); + vcpu->stat.halt_wakeup++; + } else if (vcpu->cpu != -1) { + smp_send_reschedule(vcpu->cpu); + } +} + int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq) { if (irq->irq == KVM_INTERRUPT_UNSET) { @@ -575,13 +574,7 @@ int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq) } kvmppc_core_queue_external(vcpu, irq); - - if (waitqueue_active(vcpu->arch.wqp)) { - wake_up_interruptible(vcpu->arch.wqp); - vcpu->stat.halt_wakeup++; - } else if (vcpu->cpu != -1) { - smp_send_reschedule(vcpu->cpu); - } + kvm_vcpu_kick(vcpu); return 0; } -- cgit v1.2.3 From 7d82714d4d1293edc57439c796750310866624b2 Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Fri, 9 Dec 2011 15:46:21 +0100 Subject: KVM: PPC: Book3s: PR: Disable preemption in vcpu_run MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When entering the guest, we want to make sure we're not getting preempted away, so let's disable preemption on entry, but enable it again while handling guest exits. Reported-by: Jörg Sommer Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/book3s_pr.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index 203a7b7b58b..19af2bf2b87 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -517,6 +517,7 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu, run->ready_for_interrupt_injection = 1; trace_kvm_book3s_exit(exit_nr, vcpu); + preempt_enable(); kvm_resched(vcpu); switch (exit_nr) { case BOOK3S_INTERRUPT_INST_STORAGE: @@ -761,6 +762,8 @@ program_interrupt: run->exit_reason = KVM_EXIT_INTR; r = -EINTR; } else { + preempt_disable(); + /* In case an interrupt came in that was triggered * from userspace (like DEC), we need to check what * to inject now! */ @@ -923,10 +926,13 @@ int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu) #endif ulong ext_msr; + preempt_disable(); + /* Check if we can run the vcpu at all */ if (!vcpu->arch.sane) { kvm_run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - return -EINVAL; + ret = -EINVAL; + goto out; } kvmppc_core_prepare_to_enter(vcpu); @@ -934,7 +940,8 @@ int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu) /* No need to go into the guest when all we do is going out */ if (signal_pending(current)) { kvm_run->exit_reason = KVM_EXIT_INTR; - return -EINTR; + ret = -EINTR; + goto out; } /* Save FPU state in stack */ @@ -1004,6 +1011,8 @@ int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu) current->thread.used_vsr = used_vsr; #endif +out: + preempt_enable(); return ret; } -- cgit v1.2.3 From d33ad328c0025c45f4688a769aeebddc342222c1 Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Fri, 9 Dec 2011 15:47:53 +0100 Subject: KVM: PPC: Book3s: PR: No irq_disable in vcpu_run Somewhere during merges we ended up from local_irq_enable() foo(); local_irq_disable() to always keeping irqs enabled during that part. However, we now have the following code: foo(); local_irq_disable() which disables interrupts without the surrounding code enabling them again! So let's remove that disable and be happy. Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/book3s_pr.c | 2 -- 1 file changed, 2 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index 19af2bf2b87..857ecde0cfd 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -983,8 +983,6 @@ int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu) kvm_guest_exit(); - local_irq_disable(); - current->thread.regs->msr = ext_msr; /* Make sure we save the guest FPU/Altivec/VSX state */ -- cgit v1.2.3 From 468a12c2b53776721ff83517d4a195b85c5fce54 Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Fri, 9 Dec 2011 14:44:13 +0100 Subject: KVM: PPC: Use get/set for to_svcpu to help preemption MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When running the 64-bit Book3s PR code without CONFIG_PREEMPT_NONE, we were doing a few things wrong, most notably access to PACA fields without making sure that the pointers stay stable accross the access (preempt_disable()). This patch moves to_svcpu towards a get/put model which allows us to disable preemption while accessing the shadow vcpu fields in the PACA. That way we can run preemptible and everyone's happy! Reported-by: Jörg Sommer Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_book3s.h | 76 +++++++++++++++++++++++++------- arch/powerpc/include/asm/kvm_book3s_32.h | 6 ++- arch/powerpc/include/asm/kvm_book3s_64.h | 8 +++- arch/powerpc/kvm/book3s_32_mmu_host.c | 21 ++++++--- arch/powerpc/kvm/book3s_64_mmu_host.c | 66 +++++++++++++++++---------- arch/powerpc/kvm/book3s_emulate.c | 8 +++- arch/powerpc/kvm/book3s_pr.c | 62 +++++++++++++++++--------- arch/powerpc/kvm/trace.h | 5 ++- 8 files changed, 181 insertions(+), 71 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h index 69c7377d207..c941c21a189 100644 --- a/arch/powerpc/include/asm/kvm_book3s.h +++ b/arch/powerpc/include/asm/kvm_book3s.h @@ -183,7 +183,9 @@ static inline void kvmppc_update_int_pending(struct kvm_vcpu *vcpu, static inline void kvmppc_set_gpr(struct kvm_vcpu *vcpu, int num, ulong val) { if ( num < 14 ) { - to_svcpu(vcpu)->gpr[num] = val; + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); + svcpu->gpr[num] = val; + svcpu_put(svcpu); to_book3s(vcpu)->shadow_vcpu->gpr[num] = val; } else vcpu->arch.gpr[num] = val; @@ -191,80 +193,120 @@ static inline void kvmppc_set_gpr(struct kvm_vcpu *vcpu, int num, ulong val) static inline ulong kvmppc_get_gpr(struct kvm_vcpu *vcpu, int num) { - if ( num < 14 ) - return to_svcpu(vcpu)->gpr[num]; - else + if ( num < 14 ) { + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); + ulong r = svcpu->gpr[num]; + svcpu_put(svcpu); + return r; + } else return vcpu->arch.gpr[num]; } static inline void kvmppc_set_cr(struct kvm_vcpu *vcpu, u32 val) { - to_svcpu(vcpu)->cr = val; + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); + svcpu->cr = val; + svcpu_put(svcpu); to_book3s(vcpu)->shadow_vcpu->cr = val; } static inline u32 kvmppc_get_cr(struct kvm_vcpu *vcpu) { - return to_svcpu(vcpu)->cr; + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); + u32 r; + r = svcpu->cr; + svcpu_put(svcpu); + return r; } static inline void kvmppc_set_xer(struct kvm_vcpu *vcpu, u32 val) { - to_svcpu(vcpu)->xer = val; + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); + svcpu->xer = val; to_book3s(vcpu)->shadow_vcpu->xer = val; + svcpu_put(svcpu); } static inline u32 kvmppc_get_xer(struct kvm_vcpu *vcpu) { - return to_svcpu(vcpu)->xer; + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); + u32 r; + r = svcpu->xer; + svcpu_put(svcpu); + return r; } static inline void kvmppc_set_ctr(struct kvm_vcpu *vcpu, ulong val) { - to_svcpu(vcpu)->ctr = val; + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); + svcpu->ctr = val; + svcpu_put(svcpu); } static inline ulong kvmppc_get_ctr(struct kvm_vcpu *vcpu) { - return to_svcpu(vcpu)->ctr; + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); + ulong r; + r = svcpu->ctr; + svcpu_put(svcpu); + return r; } static inline void kvmppc_set_lr(struct kvm_vcpu *vcpu, ulong val) { - to_svcpu(vcpu)->lr = val; + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); + svcpu->lr = val; + svcpu_put(svcpu); } static inline ulong kvmppc_get_lr(struct kvm_vcpu *vcpu) { - return to_svcpu(vcpu)->lr; + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); + ulong r; + r = svcpu->lr; + svcpu_put(svcpu); + return r; } static inline void kvmppc_set_pc(struct kvm_vcpu *vcpu, ulong val) { - to_svcpu(vcpu)->pc = val; + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); + svcpu->pc = val; + svcpu_put(svcpu); } static inline ulong kvmppc_get_pc(struct kvm_vcpu *vcpu) { - return to_svcpu(vcpu)->pc; + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); + ulong r; + r = svcpu->pc; + svcpu_put(svcpu); + return r; } static inline u32 kvmppc_get_last_inst(struct kvm_vcpu *vcpu) { ulong pc = kvmppc_get_pc(vcpu); - struct kvmppc_book3s_shadow_vcpu *svcpu = to_svcpu(vcpu); + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); + u32 r; /* Load the instruction manually if it failed to do so in the * exit path */ if (svcpu->last_inst == KVM_INST_FETCH_FAILED) kvmppc_ld(vcpu, &pc, sizeof(u32), &svcpu->last_inst, false); - return svcpu->last_inst; + r = svcpu->last_inst; + svcpu_put(svcpu); + return r; } static inline ulong kvmppc_get_fault_dar(struct kvm_vcpu *vcpu) { - return to_svcpu(vcpu)->fault_dar; + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); + ulong r; + r = svcpu->fault_dar; + svcpu_put(svcpu); + return r; } static inline bool kvmppc_critical_section(struct kvm_vcpu *vcpu) diff --git a/arch/powerpc/include/asm/kvm_book3s_32.h b/arch/powerpc/include/asm/kvm_book3s_32.h index de604db135f..38040ff8206 100644 --- a/arch/powerpc/include/asm/kvm_book3s_32.h +++ b/arch/powerpc/include/asm/kvm_book3s_32.h @@ -20,11 +20,15 @@ #ifndef __ASM_KVM_BOOK3S_32_H__ #define __ASM_KVM_BOOK3S_32_H__ -static inline struct kvmppc_book3s_shadow_vcpu *to_svcpu(struct kvm_vcpu *vcpu) +static inline struct kvmppc_book3s_shadow_vcpu *svcpu_get(struct kvm_vcpu *vcpu) { return to_book3s(vcpu)->shadow_vcpu; } +static inline void svcpu_put(struct kvmppc_book3s_shadow_vcpu *svcpu) +{ +} + #define PTE_SIZE 12 #define VSID_ALL 0 #define SR_INVALID 0x00000001 /* VSID 1 should always be unused */ diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h index d0ac94f98f9..2054e4726ba 100644 --- a/arch/powerpc/include/asm/kvm_book3s_64.h +++ b/arch/powerpc/include/asm/kvm_book3s_64.h @@ -21,10 +21,16 @@ #define __ASM_KVM_BOOK3S_64_H__ #ifdef CONFIG_KVM_BOOK3S_PR -static inline struct kvmppc_book3s_shadow_vcpu *to_svcpu(struct kvm_vcpu *vcpu) +static inline struct kvmppc_book3s_shadow_vcpu *svcpu_get(struct kvm_vcpu *vcpu) { + preempt_disable(); return &get_paca()->shadow_vcpu; } + +static inline void svcpu_put(struct kvmppc_book3s_shadow_vcpu *svcpu) +{ + preempt_enable(); +} #endif #define SPAPR_TCE_SHIFT 12 diff --git a/arch/powerpc/kvm/book3s_32_mmu_host.c b/arch/powerpc/kvm/book3s_32_mmu_host.c index 9fecbfbce77..f922c29bb23 100644 --- a/arch/powerpc/kvm/book3s_32_mmu_host.c +++ b/arch/powerpc/kvm/book3s_32_mmu_host.c @@ -151,13 +151,15 @@ int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte) bool primary = false; bool evict = false; struct hpte_cache *pte; + int r = 0; /* Get host physical address for gpa */ hpaddr = kvmppc_gfn_to_pfn(vcpu, orig_pte->raddr >> PAGE_SHIFT); if (is_error_pfn(hpaddr)) { printk(KERN_INFO "Couldn't get guest page for gfn %lx!\n", orig_pte->eaddr); - return -EINVAL; + r = -EINVAL; + goto out; } hpaddr <<= PAGE_SHIFT; @@ -249,7 +251,8 @@ next_pteg: kvmppc_mmu_hpte_cache_map(vcpu, pte); - return 0; +out: + return r; } static struct kvmppc_sid_map *create_sid_map(struct kvm_vcpu *vcpu, u64 gvsid) @@ -297,12 +300,14 @@ int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr) u64 gvsid; u32 sr; struct kvmppc_sid_map *map; - struct kvmppc_book3s_shadow_vcpu *svcpu = to_svcpu(vcpu); + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); + int r = 0; if (vcpu->arch.mmu.esid_to_vsid(vcpu, esid, &gvsid)) { /* Invalidate an entry */ svcpu->sr[esid] = SR_INVALID; - return -ENOENT; + r = -ENOENT; + goto out; } map = find_sid_vsid(vcpu, gvsid); @@ -315,17 +320,21 @@ int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr) dprintk_sr("MMU: mtsr %d, 0x%x\n", esid, sr); - return 0; +out: + svcpu_put(svcpu); + return r; } void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu) { int i; - struct kvmppc_book3s_shadow_vcpu *svcpu = to_svcpu(vcpu); + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); dprintk_sr("MMU: flushing all segments (%d)\n", ARRAY_SIZE(svcpu->sr)); for (i = 0; i < ARRAY_SIZE(svcpu->sr); i++) svcpu->sr[i] = SR_INVALID; + + svcpu_put(svcpu); } void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu) diff --git a/arch/powerpc/kvm/book3s_64_mmu_host.c b/arch/powerpc/kvm/book3s_64_mmu_host.c index fa2f08434ba..6f87f39a1ac 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_host.c +++ b/arch/powerpc/kvm/book3s_64_mmu_host.c @@ -88,12 +88,14 @@ int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte) int vflags = 0; int attempt = 0; struct kvmppc_sid_map *map; + int r = 0; /* Get host physical address for gpa */ hpaddr = kvmppc_gfn_to_pfn(vcpu, orig_pte->raddr >> PAGE_SHIFT); if (is_error_pfn(hpaddr)) { printk(KERN_INFO "Couldn't get guest page for gfn %lx!\n", orig_pte->eaddr); - return -EINVAL; + r = -EINVAL; + goto out; } hpaddr <<= PAGE_SHIFT; hpaddr |= orig_pte->raddr & (~0xfffULL & ~PAGE_MASK); @@ -110,7 +112,8 @@ int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte) printk(KERN_ERR "KVM: Segment map for 0x%llx (0x%lx) failed\n", vsid, orig_pte->eaddr); WARN_ON(true); - return -EINVAL; + r = -EINVAL; + goto out; } vsid = map->host_vsid; @@ -131,8 +134,10 @@ map_again: /* In case we tried normal mapping already, let's nuke old entries */ if (attempt > 1) - if (ppc_md.hpte_remove(hpteg) < 0) - return -1; + if (ppc_md.hpte_remove(hpteg) < 0) { + r = -1; + goto out; + } ret = ppc_md.hpte_insert(hpteg, va, hpaddr, rflags, vflags, MMU_PAGE_4K, MMU_SEGSIZE_256M); @@ -162,7 +167,8 @@ map_again: kvmppc_mmu_hpte_cache_map(vcpu, pte); } - return 0; +out: + return r; } static struct kvmppc_sid_map *create_sid_map(struct kvm_vcpu *vcpu, u64 gvsid) @@ -207,25 +213,30 @@ static struct kvmppc_sid_map *create_sid_map(struct kvm_vcpu *vcpu, u64 gvsid) static int kvmppc_mmu_next_segment(struct kvm_vcpu *vcpu, ulong esid) { + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); int i; int max_slb_size = 64; int found_inval = -1; int r; - if (!to_svcpu(vcpu)->slb_max) - to_svcpu(vcpu)->slb_max = 1; + if (!svcpu->slb_max) + svcpu->slb_max = 1; /* Are we overwriting? */ - for (i = 1; i < to_svcpu(vcpu)->slb_max; i++) { - if (!(to_svcpu(vcpu)->slb[i].esid & SLB_ESID_V)) + for (i = 1; i < svcpu->slb_max; i++) { + if (!(svcpu->slb[i].esid & SLB_ESID_V)) found_inval = i; - else if ((to_svcpu(vcpu)->slb[i].esid & ESID_MASK) == esid) - return i; + else if ((svcpu->slb[i].esid & ESID_MASK) == esid) { + r = i; + goto out; + } } /* Found a spare entry that was invalidated before */ - if (found_inval > 0) - return found_inval; + if (found_inval > 0) { + r = found_inval; + goto out; + } /* No spare invalid entry, so create one */ @@ -233,30 +244,35 @@ static int kvmppc_mmu_next_segment(struct kvm_vcpu *vcpu, ulong esid) max_slb_size = mmu_slb_size; /* Overflowing -> purge */ - if ((to_svcpu(vcpu)->slb_max) == max_slb_size) + if ((svcpu->slb_max) == max_slb_size) kvmppc_mmu_flush_segments(vcpu); - r = to_svcpu(vcpu)->slb_max; - to_svcpu(vcpu)->slb_max++; + r = svcpu->slb_max; + svcpu->slb_max++; +out: + svcpu_put(svcpu); return r; } int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr) { + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); u64 esid = eaddr >> SID_SHIFT; u64 slb_esid = (eaddr & ESID_MASK) | SLB_ESID_V; u64 slb_vsid = SLB_VSID_USER; u64 gvsid; int slb_index; struct kvmppc_sid_map *map; + int r = 0; slb_index = kvmppc_mmu_next_segment(vcpu, eaddr & ESID_MASK); if (vcpu->arch.mmu.esid_to_vsid(vcpu, esid, &gvsid)) { /* Invalidate an entry */ - to_svcpu(vcpu)->slb[slb_index].esid = 0; - return -ENOENT; + svcpu->slb[slb_index].esid = 0; + r = -ENOENT; + goto out; } map = find_sid_vsid(vcpu, gvsid); @@ -269,18 +285,22 @@ int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr) slb_vsid &= ~SLB_VSID_KP; slb_esid |= slb_index; - to_svcpu(vcpu)->slb[slb_index].esid = slb_esid; - to_svcpu(vcpu)->slb[slb_index].vsid = slb_vsid; + svcpu->slb[slb_index].esid = slb_esid; + svcpu->slb[slb_index].vsid = slb_vsid; trace_kvm_book3s_slbmte(slb_vsid, slb_esid); - return 0; +out: + svcpu_put(svcpu); + return r; } void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu) { - to_svcpu(vcpu)->slb_max = 1; - to_svcpu(vcpu)->slb[0].esid = 0; + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); + svcpu->slb_max = 1; + svcpu->slb[0].esid = 0; + svcpu_put(svcpu); } void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu) diff --git a/arch/powerpc/kvm/book3s_emulate.c b/arch/powerpc/kvm/book3s_emulate.c index 0c9dc62532d..f1950d13182 100644 --- a/arch/powerpc/kvm/book3s_emulate.c +++ b/arch/powerpc/kvm/book3s_emulate.c @@ -230,9 +230,12 @@ int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu, r = kvmppc_st(vcpu, &addr, 32, zeros, true); if ((r == -ENOENT) || (r == -EPERM)) { + struct kvmppc_book3s_shadow_vcpu *svcpu; + + svcpu = svcpu_get(vcpu); *advance = 0; vcpu->arch.shared->dar = vaddr; - to_svcpu(vcpu)->fault_dar = vaddr; + svcpu->fault_dar = vaddr; dsisr = DSISR_ISSTORE; if (r == -ENOENT) @@ -241,7 +244,8 @@ int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu, dsisr |= DSISR_PROTFAULT; vcpu->arch.shared->dsisr = dsisr; - to_svcpu(vcpu)->fault_dsisr = dsisr; + svcpu->fault_dsisr = dsisr; + svcpu_put(svcpu); kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_DATA_STORAGE); diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index 857ecde0cfd..0c31507be90 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -56,10 +56,12 @@ static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr, void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu) { #ifdef CONFIG_PPC_BOOK3S_64 - memcpy(to_svcpu(vcpu)->slb, to_book3s(vcpu)->slb_shadow, sizeof(to_svcpu(vcpu)->slb)); + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); + memcpy(svcpu->slb, to_book3s(vcpu)->slb_shadow, sizeof(svcpu->slb)); memcpy(&get_paca()->shadow_vcpu, to_book3s(vcpu)->shadow_vcpu, sizeof(get_paca()->shadow_vcpu)); - to_svcpu(vcpu)->slb_max = to_book3s(vcpu)->slb_shadow_max; + svcpu->slb_max = to_book3s(vcpu)->slb_shadow_max; + svcpu_put(svcpu); #endif #ifdef CONFIG_PPC_BOOK3S_32 @@ -70,10 +72,12 @@ void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu) void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu) { #ifdef CONFIG_PPC_BOOK3S_64 - memcpy(to_book3s(vcpu)->slb_shadow, to_svcpu(vcpu)->slb, sizeof(to_svcpu(vcpu)->slb)); + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); + memcpy(to_book3s(vcpu)->slb_shadow, svcpu->slb, sizeof(svcpu->slb)); memcpy(to_book3s(vcpu)->shadow_vcpu, &get_paca()->shadow_vcpu, sizeof(get_paca()->shadow_vcpu)); - to_book3s(vcpu)->slb_shadow_max = to_svcpu(vcpu)->slb_max; + to_book3s(vcpu)->slb_shadow_max = svcpu->slb_max; + svcpu_put(svcpu); #endif kvmppc_giveup_ext(vcpu, MSR_FP); @@ -308,19 +312,22 @@ int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu, if (page_found == -ENOENT) { /* Page not found in guest PTE entries */ + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu); - vcpu->arch.shared->dsisr = to_svcpu(vcpu)->fault_dsisr; + vcpu->arch.shared->dsisr = svcpu->fault_dsisr; vcpu->arch.shared->msr |= - (to_svcpu(vcpu)->shadow_srr1 & 0x00000000f8000000ULL); + (svcpu->shadow_srr1 & 0x00000000f8000000ULL); + svcpu_put(svcpu); kvmppc_book3s_queue_irqprio(vcpu, vec); } else if (page_found == -EPERM) { /* Storage protection */ + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu); - vcpu->arch.shared->dsisr = - to_svcpu(vcpu)->fault_dsisr & ~DSISR_NOHPTE; + vcpu->arch.shared->dsisr = svcpu->fault_dsisr & ~DSISR_NOHPTE; vcpu->arch.shared->dsisr |= DSISR_PROTFAULT; vcpu->arch.shared->msr |= - (to_svcpu(vcpu)->shadow_srr1 & 0x00000000f8000000ULL); + svcpu->shadow_srr1 & 0x00000000f8000000ULL; + svcpu_put(svcpu); kvmppc_book3s_queue_irqprio(vcpu, vec); } else if (page_found == -EINVAL) { /* Page not found in guest SLB */ @@ -521,21 +528,25 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu, kvm_resched(vcpu); switch (exit_nr) { case BOOK3S_INTERRUPT_INST_STORAGE: + { + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); + ulong shadow_srr1 = svcpu->shadow_srr1; vcpu->stat.pf_instruc++; #ifdef CONFIG_PPC_BOOK3S_32 /* We set segments as unused segments when invalidating them. So * treat the respective fault as segment fault. */ - if (to_svcpu(vcpu)->sr[kvmppc_get_pc(vcpu) >> SID_SHIFT] - == SR_INVALID) { + if (svcpu->sr[kvmppc_get_pc(vcpu) >> SID_SHIFT] == SR_INVALID) { kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu)); r = RESUME_GUEST; + svcpu_put(svcpu); break; } #endif + svcpu_put(svcpu); /* only care about PTEG not found errors, but leave NX alone */ - if (to_svcpu(vcpu)->shadow_srr1 & 0x40000000) { + if (shadow_srr1 & 0x40000000) { r = kvmppc_handle_pagefault(run, vcpu, kvmppc_get_pc(vcpu), exit_nr); vcpu->stat.sp_instruc++; } else if (vcpu->arch.mmu.is_dcbz32(vcpu) && @@ -548,33 +559,37 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu, kvmppc_mmu_pte_flush(vcpu, kvmppc_get_pc(vcpu), ~0xFFFUL); r = RESUME_GUEST; } else { - vcpu->arch.shared->msr |= - to_svcpu(vcpu)->shadow_srr1 & 0x58000000; + vcpu->arch.shared->msr |= shadow_srr1 & 0x58000000; kvmppc_book3s_queue_irqprio(vcpu, exit_nr); r = RESUME_GUEST; } break; + } case BOOK3S_INTERRUPT_DATA_STORAGE: { ulong dar = kvmppc_get_fault_dar(vcpu); + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); + u32 fault_dsisr = svcpu->fault_dsisr; vcpu->stat.pf_storage++; #ifdef CONFIG_PPC_BOOK3S_32 /* We set segments as unused segments when invalidating them. So * treat the respective fault as segment fault. */ - if ((to_svcpu(vcpu)->sr[dar >> SID_SHIFT]) == SR_INVALID) { + if ((svcpu->sr[dar >> SID_SHIFT]) == SR_INVALID) { kvmppc_mmu_map_segment(vcpu, dar); r = RESUME_GUEST; + svcpu_put(svcpu); break; } #endif + svcpu_put(svcpu); /* The only case we need to handle is missing shadow PTEs */ - if (to_svcpu(vcpu)->fault_dsisr & DSISR_NOHPTE) { + if (fault_dsisr & DSISR_NOHPTE) { r = kvmppc_handle_pagefault(run, vcpu, dar, exit_nr); } else { vcpu->arch.shared->dar = dar; - vcpu->arch.shared->dsisr = to_svcpu(vcpu)->fault_dsisr; + vcpu->arch.shared->dsisr = fault_dsisr; kvmppc_book3s_queue_irqprio(vcpu, exit_nr); r = RESUME_GUEST; } @@ -610,10 +625,13 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu, case BOOK3S_INTERRUPT_PROGRAM: { enum emulation_result er; + struct kvmppc_book3s_shadow_vcpu *svcpu; ulong flags; program_interrupt: - flags = to_svcpu(vcpu)->shadow_srr1 & 0x1f0000ull; + svcpu = svcpu_get(vcpu); + flags = svcpu->shadow_srr1 & 0x1f0000ull; + svcpu_put(svcpu); if (vcpu->arch.shared->msr & MSR_PR) { #ifdef EXIT_DEBUG @@ -741,14 +759,18 @@ program_interrupt: r = RESUME_GUEST; break; default: + { + struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu); + ulong shadow_srr1 = svcpu->shadow_srr1; + svcpu_put(svcpu); /* Ugh - bork here! What did we get? */ printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | msr=0x%lx\n", - exit_nr, kvmppc_get_pc(vcpu), to_svcpu(vcpu)->shadow_srr1); + exit_nr, kvmppc_get_pc(vcpu), shadow_srr1); r = RESUME_HOST; BUG(); break; } - + } if (!(r & RESUME_HOST)) { /* To avoid clobbering exit_reason, only check for signals if diff --git a/arch/powerpc/kvm/trace.h b/arch/powerpc/kvm/trace.h index b135d3d397d..609d8bfb54e 100644 --- a/arch/powerpc/kvm/trace.h +++ b/arch/powerpc/kvm/trace.h @@ -118,11 +118,14 @@ TRACE_EVENT(kvm_book3s_exit, ), TP_fast_assign( + struct kvmppc_book3s_shadow_vcpu *svcpu; __entry->exit_nr = exit_nr; __entry->pc = kvmppc_get_pc(vcpu); __entry->dar = kvmppc_get_fault_dar(vcpu); __entry->msr = vcpu->arch.shared->msr; - __entry->srr1 = to_svcpu(vcpu)->shadow_srr1; + svcpu = svcpu_get(vcpu); + __entry->srr1 = svcpu->shadow_srr1; + svcpu_put(svcpu); ), TP_printk("exit=0x%x | pc=0x%lx | msr=0x%lx | dar=0x%lx | srr1=0x%lx", -- cgit v1.2.3 From ae21216bece0a623d09980c120b9c98790a860b9 Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Fri, 9 Dec 2011 15:20:46 +0100 Subject: KVM: PPC: align vcpu_kick with x86 Our vcpu kick implementation differs a bit from x86 which resulted in us not disabling preemption during the kick. Get it a bit closer to what x86 does. Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/powerpc.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index fd8d3b16eaf..e1ef4d6d972 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -558,12 +558,17 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) void kvm_vcpu_kick(struct kvm_vcpu *vcpu) { + int me; + int cpu = vcpu->cpu; + + me = get_cpu(); if (waitqueue_active(&vcpu->wq)) { wake_up_interruptible(vcpu->arch.wqp); vcpu->stat.halt_wakeup++; - } else if (vcpu->cpu != -1) { + } else if (cpu != me && cpu != -1) { smp_send_reschedule(vcpu->cpu); } + put_cpu(); } int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq) -- cgit v1.2.3 From e371f713db6523d99d8ffae8f9da564055e6de17 Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Mon, 19 Dec 2011 13:36:55 +0100 Subject: KVM: PPC: Book3S: PR: Fix signal check race As Scott put it: > If we get a signal after the check, we want to be sure that we don't > receive the reschedule IPI until after we're in the guest, so that it > will cause another signal check. we need to have interrupts disabled from the point we do signal_check() all the way until we actually enter the guest. This patch fixes potential signal loss races. Reported-by: Scott Wood Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/book3s_pr.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index 0c31507be90..2da67040572 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -51,6 +51,8 @@ static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr, #define MSR_USER32 MSR_USER #define MSR_USER64 MSR_USER #define HW_PAGE_SIZE PAGE_SIZE +#define __hard_irq_disable local_irq_disable +#define __hard_irq_enable local_irq_enable #endif void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu) @@ -776,7 +778,16 @@ program_interrupt: /* To avoid clobbering exit_reason, only check for signals if * we aren't already exiting to userspace for some other * reason. */ + + /* + * Interrupts could be timers for the guest which we have to + * inject again, so let's postpone them until we're in the guest + * and if we really did time things so badly, then we just exit + * again due to a host external interrupt. + */ + __hard_irq_disable(); if (signal_pending(current)) { + __hard_irq_enable(); #ifdef EXIT_DEBUG printk(KERN_EMERG "KVM: Going back to host\n"); #endif @@ -959,8 +970,17 @@ int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu) kvmppc_core_prepare_to_enter(vcpu); + /* + * Interrupts could be timers for the guest which we have to inject + * again, so let's postpone them until we're in the guest and if we + * really did time things so badly, then we just exit again due to + * a host external interrupt. + */ + __hard_irq_disable(); + /* No need to go into the guest when all we do is going out */ if (signal_pending(current)) { + __hard_irq_enable(); kvm_run->exit_reason = KVM_EXIT_INTR; ret = -EINTR; goto out; -- cgit v1.2.3 From 7b11dc993841f1643c0932cf0faf010406502572 Mon Sep 17 00:00:00 2001 From: Scott Wood Date: Mon, 28 Nov 2011 15:20:02 +0000 Subject: KVM: PPC: e500: Fix TLBnCFG in KVM_CONFIG_TLB The associativity, not just total size, can differ from the host hardware. Signed-off-by: Scott Wood Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/e500_tlb.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/e500_tlb.c b/arch/powerpc/kvm/e500_tlb.c index 9cd124a11ac..507376890cf 100644 --- a/arch/powerpc/kvm/e500_tlb.c +++ b/arch/powerpc/kvm/e500_tlb.c @@ -1227,12 +1227,14 @@ int kvm_vcpu_ioctl_config_tlb(struct kvm_vcpu *vcpu, vcpu_e500->gtlb_offset[0] = 0; vcpu_e500->gtlb_offset[1] = params.tlb_sizes[0]; - vcpu_e500->tlb0cfg = mfspr(SPRN_TLB0CFG) & ~0xfffUL; + vcpu_e500->tlb0cfg &= ~(TLBnCFG_N_ENTRY | TLBnCFG_ASSOC); if (params.tlb_sizes[0] <= 2048) vcpu_e500->tlb0cfg |= params.tlb_sizes[0]; + vcpu_e500->tlb0cfg |= params.tlb_ways[0] << TLBnCFG_ASSOC_SHIFT; - vcpu_e500->tlb1cfg = mfspr(SPRN_TLB1CFG) & ~0xfffUL; + vcpu_e500->tlb1cfg &= ~(TLBnCFG_N_ENTRY | TLBnCFG_ASSOC); vcpu_e500->tlb1cfg |= params.tlb_sizes[1]; + vcpu_e500->tlb1cfg |= params.tlb_ways[1] << TLBnCFG_ASSOC_SHIFT; vcpu_e500->shared_tlb_pages = pages; vcpu_e500->num_shared_tlb_pages = num_pages; @@ -1348,10 +1350,17 @@ int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500) goto err; /* Init TLB configuration register */ - vcpu_e500->tlb0cfg = mfspr(SPRN_TLB0CFG) & ~0xfffUL; + vcpu_e500->tlb0cfg = mfspr(SPRN_TLB0CFG) & + ~(TLBnCFG_N_ENTRY | TLBnCFG_ASSOC); vcpu_e500->tlb0cfg |= vcpu_e500->gtlb_params[0].entries; - vcpu_e500->tlb1cfg = mfspr(SPRN_TLB1CFG) & ~0xfffUL; - vcpu_e500->tlb1cfg |= vcpu_e500->gtlb_params[1].entries; + vcpu_e500->tlb0cfg |= + vcpu_e500->gtlb_params[0].ways << TLBnCFG_ASSOC_SHIFT; + + vcpu_e500->tlb1cfg = mfspr(SPRN_TLB1CFG) & + ~(TLBnCFG_N_ENTRY | TLBnCFG_ASSOC); + vcpu_e500->tlb0cfg |= vcpu_e500->gtlb_params[1].entries; + vcpu_e500->tlb0cfg |= + vcpu_e500->gtlb_params[1].ways << TLBnCFG_ASSOC_SHIFT; return 0; -- cgit v1.2.3 From 570135243a33174a5d74641de693b6c0233d1181 Mon Sep 17 00:00:00 2001 From: Scott Wood Date: Tue, 29 Nov 2011 10:40:23 +0000 Subject: KVM: PPC: e500: use hardware hint when loading TLB0 entries The hardware maintains a per-set next victim hint. Using this reduces conflicts, especially on e500v2 where a single guest TLB entry is mapped to two shadow TLB entries (user and kernel). We want those two entries to go to different TLB ways. sesel is now only used for TLB1. Reported-by: Liu Yu Signed-off-by: Scott Wood Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/mmu-book3e.h | 5 ++- arch/powerpc/kvm/e500_tlb.c | 69 ++++++++++++++++++++--------------- 2 files changed, 42 insertions(+), 32 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/mmu-book3e.h b/arch/powerpc/include/asm/mmu-book3e.h index a0128232d9c..cdb5421877e 100644 --- a/arch/powerpc/include/asm/mmu-book3e.h +++ b/arch/powerpc/include/asm/mmu-book3e.h @@ -41,9 +41,10 @@ /* MAS registers bit definitions */ #define MAS0_TLBSEL(x) (((x) << 28) & 0x30000000) -#define MAS0_ESEL(x) (((x) << 16) & 0x0FFF0000) -#define MAS0_NV(x) ((x) & 0x00000FFF) #define MAS0_ESEL_MASK 0x0FFF0000 +#define MAS0_ESEL_SHIFT 16 +#define MAS0_ESEL(x) (((x) << MAS0_ESEL_SHIFT) & MAS0_ESEL_MASK) +#define MAS0_NV(x) ((x) & 0x00000FFF) #define MAS0_HES 0x00004000 #define MAS0_WQ_ALLWAYS 0x00000000 #define MAS0_WQ_COND 0x00001000 diff --git a/arch/powerpc/kvm/e500_tlb.c b/arch/powerpc/kvm/e500_tlb.c index 507376890cf..1746e677bf3 100644 --- a/arch/powerpc/kvm/e500_tlb.c +++ b/arch/powerpc/kvm/e500_tlb.c @@ -296,17 +296,41 @@ static inline void __write_host_tlbe(struct kvm_book3e_206_tlb_entry *stlbe, local_irq_restore(flags); } -/* esel is index into set, not whole array */ +/* + * Acquire a mas0 with victim hint, as if we just took a TLB miss. + * + * We don't care about the address we're searching for, other than that it's + * in the right set and is not present in the TLB. Using a zero PID and a + * userspace address means we don't have to set and then restore MAS5, or + * calculate a proper MAS6 value. + */ +static u32 get_host_mas0(unsigned long eaddr) +{ + unsigned long flags; + u32 mas0; + + local_irq_save(flags); + mtspr(SPRN_MAS6, 0); + asm volatile("tlbsx 0, %0" : : "b" (eaddr & ~CONFIG_PAGE_OFFSET)); + mas0 = mfspr(SPRN_MAS0); + local_irq_restore(flags); + + return mas0; +} + +/* sesel is for tlb1 only */ static inline void write_host_tlbe(struct kvmppc_vcpu_e500 *vcpu_e500, - int tlbsel, int esel, struct kvm_book3e_206_tlb_entry *stlbe) + int tlbsel, int sesel, struct kvm_book3e_206_tlb_entry *stlbe) { + u32 mas0; + if (tlbsel == 0) { - int way = esel & (vcpu_e500->gtlb_params[0].ways - 1); - __write_host_tlbe(stlbe, MAS0_TLBSEL(0) | MAS0_ESEL(way)); + mas0 = get_host_mas0(stlbe->mas2); + __write_host_tlbe(stlbe, mas0); } else { __write_host_tlbe(stlbe, MAS0_TLBSEL(1) | - MAS0_ESEL(to_htlb1_esel(esel))); + MAS0_ESEL(to_htlb1_esel(sesel))); } trace_kvm_stlb_write(index_of(tlbsel, esel), stlbe->mas1, stlbe->mas2, (u32)stlbe->mas7_3, (u32)(stlbe->mas7_3 >> 32)); @@ -422,12 +446,6 @@ static int gtlb0_set_base(struct kvmppc_vcpu_e500 *vcpu_e500, gva_t addr) vcpu_e500->gtlb_params[0].ways); } -static int htlb0_set_base(gva_t addr) -{ - return tlb0_set_base(addr, host_tlb_params[0].sets, - host_tlb_params[0].ways); -} - static unsigned int get_tlb_esel(struct kvm_vcpu *vcpu, int tlbsel) { struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu); @@ -585,10 +603,9 @@ static inline void kvmppc_e500_setup_stlbe( vcpu_e500->vcpu.arch.shared->msr & MSR_PR); } -/* sesel is an index into the entire array, not just the set */ static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500, u64 gvaddr, gfn_t gfn, struct kvm_book3e_206_tlb_entry *gtlbe, - int tlbsel, int sesel, struct kvm_book3e_206_tlb_entry *stlbe, + int tlbsel, struct kvm_book3e_206_tlb_entry *stlbe, struct tlbe_ref *ref) { struct kvm_memory_slot *slot; @@ -721,27 +738,19 @@ static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500, } /* XXX only map the one-one case, for now use TLB0 */ -static int kvmppc_e500_tlb0_map(struct kvmppc_vcpu_e500 *vcpu_e500, - int esel, - struct kvm_book3e_206_tlb_entry *stlbe) +static void kvmppc_e500_tlb0_map(struct kvmppc_vcpu_e500 *vcpu_e500, + int esel, + struct kvm_book3e_206_tlb_entry *stlbe) { struct kvm_book3e_206_tlb_entry *gtlbe; struct tlbe_ref *ref; - int sesel = esel & (host_tlb_params[0].ways - 1); - int sesel_base; - gva_t ea; gtlbe = get_entry(vcpu_e500, 0, esel); ref = &vcpu_e500->gtlb_priv[0][esel].ref; - ea = get_tlb_eaddr(gtlbe); - sesel_base = htlb0_set_base(ea); - kvmppc_e500_shadow_map(vcpu_e500, get_tlb_eaddr(gtlbe), get_tlb_raddr(gtlbe) >> PAGE_SHIFT, - gtlbe, 0, sesel_base + sesel, stlbe, ref); - - return sesel; + gtlbe, 0, stlbe, ref); } /* Caller must ensure that the specified guest TLB entry is safe to insert into @@ -760,8 +769,7 @@ static int kvmppc_e500_tlb1_map(struct kvmppc_vcpu_e500 *vcpu_e500, vcpu_e500->host_tlb1_nv = 0; ref = &vcpu_e500->tlb_refs[1][victim]; - kvmppc_e500_shadow_map(vcpu_e500, gvaddr, gfn, gtlbe, 1, - victim, stlbe, ref); + kvmppc_e500_shadow_map(vcpu_e500, gvaddr, gfn, gtlbe, 1, stlbe, ref); return victim; } @@ -910,7 +918,7 @@ int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, int rb) return EMULATE_DONE; } -/* sesel is index into the set, not the whole array */ +/* sesel is for tlb1 only */ static void write_stlbe(struct kvmppc_vcpu_e500 *vcpu_e500, struct kvm_book3e_206_tlb_entry *gtlbe, struct kvm_book3e_206_tlb_entry *stlbe, @@ -963,7 +971,8 @@ int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu) gtlbe->mas1 |= MAS1_TSIZE(BOOK3E_PAGESZ_4K); stlbsel = 0; - sesel = kvmppc_e500_tlb0_map(vcpu_e500, esel, &stlbe); + kvmppc_e500_tlb0_map(vcpu_e500, esel, &stlbe); + sesel = 0; /* unused */ break; @@ -1052,7 +1061,7 @@ void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 eaddr, gpa_t gpaddr, switch (tlbsel) { case 0: stlbsel = 0; - sesel = esel & (host_tlb_params[0].ways - 1); + sesel = 0; /* unused */ priv = &vcpu_e500->gtlb_priv[tlbsel][esel]; kvmppc_e500_setup_stlbe(vcpu_e500, gtlbe, BOOK3E_PAGESZ_4K, -- cgit v1.2.3 From befdc0a65afd17181392eff3d43c63407f266a9f Mon Sep 17 00:00:00 2001 From: Liu Yu-B13201 Date: Thu, 1 Dec 2011 20:22:53 +0000 Subject: KVM: PPC: Avoid patching paravirt template code Currently we patch the whole code include paravirt template code. This isn't safe for scratch area and has impact to performance. Signed-off-by: Liu Yu Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kernel/kvm.c | 11 ++++++++++- arch/powerpc/kernel/kvm_emul.S | 6 ++++++ 2 files changed, 16 insertions(+), 1 deletion(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c index 04d4b5aa6dc..62bdf238966 100644 --- a/arch/powerpc/kernel/kvm.c +++ b/arch/powerpc/kernel/kvm.c @@ -665,6 +665,9 @@ static void kvm_check_ins(u32 *inst, u32 features) } } +extern u32 kvm_template_start[]; +extern u32 kvm_template_end[]; + static void kvm_use_magic_page(void) { u32 *p; @@ -692,8 +695,14 @@ static void kvm_use_magic_page(void) */ local_irq_disable(); - for (p = start; p < end; p++) + for (p = start; p < end; p++) { + /* Avoid patching the template code */ + if (p >= kvm_template_start && p < kvm_template_end) { + p = kvm_template_end - 1; + continue; + } kvm_check_ins(p, features); + } local_irq_enable(); diff --git a/arch/powerpc/kernel/kvm_emul.S b/arch/powerpc/kernel/kvm_emul.S index 801058dd74d..e291cf3cf95 100644 --- a/arch/powerpc/kernel/kvm_emul.S +++ b/arch/powerpc/kernel/kvm_emul.S @@ -66,6 +66,9 @@ kvm_hypercall_start: shared->critical == r1 and r2 is always != r1 */ \ STL64(r2, KVM_MAGIC_PAGE + KVM_MAGIC_CRITICAL, 0); +.global kvm_template_start +kvm_template_start: + .global kvm_emulate_mtmsrd kvm_emulate_mtmsrd: @@ -350,3 +353,6 @@ kvm_emulate_mtsrin_orig_ins_offs: .global kvm_emulate_mtsrin_len kvm_emulate_mtsrin_len: .long (kvm_emulate_mtsrin_end - kvm_emulate_mtsrin) / 4 + +.global kvm_template_end +kvm_template_end: -- cgit v1.2.3 From 4e72dbe13528394a413889d73e5025dbdf6cab70 Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Mon, 12 Dec 2011 12:24:48 +0000 Subject: KVM: PPC: Make wakeups work again for Book3S HV guests When commit f43fdc15fa ("KVM: PPC: booke: Improve timer register emulation") factored out some code in arch/powerpc/kvm/powerpc.c into a new helper function, kvm_vcpu_kick(), an error crept in which causes Book3s HV guest vcpus to stall. This fixes it. On POWER7 machines, guest vcpus are grouped together into virtual CPU cores that share a single waitqueue, so it's important to use vcpu->arch.wqp rather than &vcpu->wq. Signed-off-by: Paul Mackerras Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/powerpc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index e1ef4d6d972..4f85ac32258 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -562,7 +562,7 @@ void kvm_vcpu_kick(struct kvm_vcpu *vcpu) int cpu = vcpu->cpu; me = get_cpu(); - if (waitqueue_active(&vcpu->wq)) { + if (waitqueue_active(vcpu->arch.wqp)) { wake_up_interruptible(vcpu->arch.wqp); vcpu->stat.halt_wakeup++; } else if (cpu != me && cpu != -1) { -- cgit v1.2.3 From 8936dda4c2ed070ecebd786baf35b08584accf4a Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Mon, 12 Dec 2011 12:27:39 +0000 Subject: KVM: PPC: Keep a record of HV guest view of hashed page table entries This adds an array that parallels the guest hashed page table (HPT), that is, it has one entry per HPTE, used to store the guest's view of the second doubleword of the corresponding HPTE. The first doubleword in the HPTE is the same as the guest's idea of it, so we don't need to store a copy, but the second doubleword in the HPTE has the real page number rather than the guest's logical page number. This allows us to remove the back_translate() and reverse_xlate() functions. This "reverse mapping" array is vmalloc'd, meaning that to access it in real mode we have to walk the kernel's page tables explicitly. That is done by the new real_vmalloc_addr() function. (In fact this returns an address in the linear mapping, so the result is usable both in real mode and in virtual mode.) There are also some minor cleanups here: moving the definitions of HPT_ORDER etc. to a header file and defining HPT_NPTE for HPT_NPTEG << 3. Signed-off-by: Paul Mackerras Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_book3s_64.h | 8 +++ arch/powerpc/include/asm/kvm_host.h | 10 ++++ arch/powerpc/kvm/book3s_64_mmu_hv.c | 44 +++++++++++----- arch/powerpc/kvm/book3s_hv_rm_mmu.c | 87 +++++++++++++++++++------------- 4 files changed, 103 insertions(+), 46 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h index 2054e4726ba..fa3dc79af70 100644 --- a/arch/powerpc/include/asm/kvm_book3s_64.h +++ b/arch/powerpc/include/asm/kvm_book3s_64.h @@ -35,6 +35,14 @@ static inline void svcpu_put(struct kvmppc_book3s_shadow_vcpu *svcpu) #define SPAPR_TCE_SHIFT 12 +#ifdef CONFIG_KVM_BOOK3S_64_HV +/* For now use fixed-size 16MB page table */ +#define HPT_ORDER 24 +#define HPT_NPTEG (1ul << (HPT_ORDER - 7)) /* 128B per pteg */ +#define HPT_NPTE (HPT_NPTEG << 3) /* 8 PTEs per PTEG */ +#define HPT_HASH_MASK (HPT_NPTEG - 1) +#endif + static inline unsigned long compute_tlbie_rb(unsigned long v, unsigned long r, unsigned long pte_index) { diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 66c75cddaec..629df2ed22f 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -166,9 +166,19 @@ struct kvmppc_rma_info { atomic_t use_count; }; +/* + * The reverse mapping array has one entry for each HPTE, + * which stores the guest's view of the second word of the HPTE + * (including the guest physical address of the mapping). + */ +struct revmap_entry { + unsigned long guest_rpte; +}; + struct kvm_arch { #ifdef CONFIG_KVM_BOOK3S_64_HV unsigned long hpt_virt; + struct revmap_entry *revmap; unsigned long ram_npages; unsigned long ram_psize; unsigned long ram_porder; diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index bc3a2ea9421..80ece8de407 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -23,6 +23,7 @@ #include #include #include +#include #include #include @@ -33,11 +34,6 @@ #include #include -/* For now use fixed-size 16MB page table */ -#define HPT_ORDER 24 -#define HPT_NPTEG (1ul << (HPT_ORDER - 7)) /* 128B per pteg */ -#define HPT_HASH_MASK (HPT_NPTEG - 1) - /* Pages in the VRMA are 16MB pages */ #define VRMA_PAGE_ORDER 24 #define VRMA_VSID 0x1ffffffUL /* 1TB VSID reserved for VRMA */ @@ -51,7 +47,9 @@ long kvmppc_alloc_hpt(struct kvm *kvm) { unsigned long hpt; unsigned long lpid; + struct revmap_entry *rev; + /* Allocate guest's hashed page table */ hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_REPEAT|__GFP_NOWARN, HPT_ORDER - PAGE_SHIFT); if (!hpt) { @@ -60,12 +58,20 @@ long kvmppc_alloc_hpt(struct kvm *kvm) } kvm->arch.hpt_virt = hpt; + /* Allocate reverse map array */ + rev = vmalloc(sizeof(struct revmap_entry) * HPT_NPTE); + if (!rev) { + pr_err("kvmppc_alloc_hpt: Couldn't alloc reverse map array\n"); + goto out_freehpt; + } + kvm->arch.revmap = rev; + + /* Allocate the guest's logical partition ID */ do { lpid = find_first_zero_bit(lpid_inuse, NR_LPIDS); if (lpid >= NR_LPIDS) { pr_err("kvm_alloc_hpt: No LPIDs free\n"); - free_pages(hpt, HPT_ORDER - PAGE_SHIFT); - return -ENOMEM; + goto out_freeboth; } } while (test_and_set_bit(lpid, lpid_inuse)); @@ -74,11 +80,18 @@ long kvmppc_alloc_hpt(struct kvm *kvm) pr_info("KVM guest htab at %lx, LPID %lx\n", hpt, lpid); return 0; + + out_freeboth: + vfree(rev); + out_freehpt: + free_pages(hpt, HPT_ORDER - PAGE_SHIFT); + return -ENOMEM; } void kvmppc_free_hpt(struct kvm *kvm) { clear_bit(kvm->arch.lpid, lpid_inuse); + vfree(kvm->arch.revmap); free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT); } @@ -89,14 +102,16 @@ void kvmppc_map_vrma(struct kvm *kvm, struct kvm_userspace_memory_region *mem) unsigned long pfn; unsigned long *hpte; unsigned long hash; + unsigned long porder = kvm->arch.ram_porder; + struct revmap_entry *rev; struct kvmppc_pginfo *pginfo = kvm->arch.ram_pginfo; if (!pginfo) return; /* VRMA can't be > 1TB */ - if (npages > 1ul << (40 - kvm->arch.ram_porder)) - npages = 1ul << (40 - kvm->arch.ram_porder); + if (npages > 1ul << (40 - porder)) + npages = 1ul << (40 - porder); /* Can't use more than 1 HPTE per HPTEG */ if (npages > HPT_NPTEG) npages = HPT_NPTEG; @@ -113,15 +128,20 @@ void kvmppc_map_vrma(struct kvm *kvm, struct kvm_userspace_memory_region *mem) * at most one HPTE per HPTEG, we just assume entry 7 * is available and use it. */ - hpte = (unsigned long *) (kvm->arch.hpt_virt + (hash << 7)); - hpte += 7 * 2; + hash = (hash << 3) + 7; + hpte = (unsigned long *) (kvm->arch.hpt_virt + (hash << 4)); /* HPTE low word - RPN, protection, etc. */ hpte[1] = (pfn << PAGE_SHIFT) | HPTE_R_R | HPTE_R_C | HPTE_R_M | PP_RWXX; - wmb(); + smp_wmb(); hpte[0] = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) | (i << (VRMA_PAGE_ORDER - 16)) | HPTE_V_BOLTED | HPTE_V_LARGE | HPTE_V_VALID; + + /* Reverse map info */ + rev = &kvm->arch.revmap[hash]; + rev->guest_rpte = (i << porder) | HPTE_R_R | HPTE_R_C | + HPTE_R_M | PP_RWXX; } } diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c index bacb0cfa360..614849360a0 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c @@ -20,10 +20,19 @@ #include #include -/* For now use fixed-size 16MB page table */ -#define HPT_ORDER 24 -#define HPT_NPTEG (1ul << (HPT_ORDER - 7)) /* 128B per pteg */ -#define HPT_HASH_MASK (HPT_NPTEG - 1) +/* Translate address of a vmalloc'd thing to a linear map address */ +static void *real_vmalloc_addr(void *x) +{ + unsigned long addr = (unsigned long) x; + pte_t *p; + + p = find_linux_pte(swapper_pg_dir, addr); + if (!p || !pte_present(*p)) + return NULL; + /* assume we don't have huge pages in vmalloc space... */ + addr = (pte_pfn(*p) << PAGE_SHIFT) | (addr & ~PAGE_MASK); + return __va(addr); +} #define HPTE_V_HVLOCK 0x40UL @@ -52,6 +61,8 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, struct kvm *kvm = vcpu->kvm; unsigned long i, lpn, pa; unsigned long *hpte; + struct revmap_entry *rev; + unsigned long g_ptel = ptel; /* only handle 4k, 64k and 16M pages for now */ porder = 12; @@ -82,7 +93,7 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, pteh &= ~0x60UL; ptel &= ~(HPTE_R_PP0 - kvm->arch.ram_psize); ptel |= pa; - if (pte_index >= (HPT_NPTEG << 3)) + if (pte_index >= HPT_NPTE) return H_PARAMETER; if (likely((flags & H_EXACT) == 0)) { pte_index &= ~7UL; @@ -95,18 +106,22 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, break; hpte += 2; } + pte_index += i; } else { - i = 0; hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); if (!lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID)) return H_PTEG_FULL; } + + /* Save away the guest's idea of the second HPTE dword */ + rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); + if (rev) + rev->guest_rpte = g_ptel; hpte[1] = ptel; eieio(); hpte[0] = pteh; asm volatile("ptesync" : : : "memory"); - atomic_inc(&kvm->arch.ram_pginfo[lpn].refcnt); - vcpu->arch.gpr[4] = pte_index + i; + vcpu->arch.gpr[4] = pte_index; return H_SUCCESS; } @@ -138,7 +153,7 @@ long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags, unsigned long *hpte; unsigned long v, r, rb; - if (pte_index >= (HPT_NPTEG << 3)) + if (pte_index >= HPT_NPTE) return H_PARAMETER; hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); while (!lock_hpte(hpte, HPTE_V_HVLOCK)) @@ -193,7 +208,7 @@ long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu) if (req == 3) break; if (req != 1 || flags == 3 || - pte_index >= (HPT_NPTEG << 3)) { + pte_index >= HPT_NPTE) { /* parameter error */ args[i * 2] = ((0xa0 | flags) << 56) + pte_index; ret = H_PARAMETER; @@ -256,9 +271,10 @@ long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags, { struct kvm *kvm = vcpu->kvm; unsigned long *hpte; - unsigned long v, r, rb; + struct revmap_entry *rev; + unsigned long v, r, rb, mask, bits; - if (pte_index >= (HPT_NPTEG << 3)) + if (pte_index >= HPT_NPTE) return H_PARAMETER; hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); while (!lock_hpte(hpte, HPTE_V_HVLOCK)) @@ -271,11 +287,21 @@ long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags, if (atomic_read(&kvm->online_vcpus) == 1) flags |= H_LOCAL; v = hpte[0]; - r = hpte[1] & ~(HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N | - HPTE_R_KEY_HI | HPTE_R_KEY_LO); - r |= (flags << 55) & HPTE_R_PP0; - r |= (flags << 48) & HPTE_R_KEY_HI; - r |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO); + bits = (flags << 55) & HPTE_R_PP0; + bits |= (flags << 48) & HPTE_R_KEY_HI; + bits |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO); + + /* Update guest view of 2nd HPTE dword */ + mask = HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N | + HPTE_R_KEY_HI | HPTE_R_KEY_LO; + rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); + if (rev) { + r = (rev->guest_rpte & ~mask) | bits; + rev->guest_rpte = r; + } + r = (hpte[1] & ~mask) | bits; + + /* Update HPTE */ rb = compute_tlbie_rb(v, r, pte_index); hpte[0] = v & ~HPTE_V_VALID; if (!(flags & H_LOCAL)) { @@ -298,38 +324,31 @@ long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags, return H_SUCCESS; } -static unsigned long reverse_xlate(struct kvm *kvm, unsigned long realaddr) -{ - long int i; - unsigned long offset, rpn; - - offset = realaddr & (kvm->arch.ram_psize - 1); - rpn = (realaddr - offset) >> PAGE_SHIFT; - for (i = 0; i < kvm->arch.ram_npages; ++i) - if (rpn == kvm->arch.ram_pginfo[i].pfn) - return (i << PAGE_SHIFT) + offset; - return HPTE_R_RPN; /* all 1s in the RPN field */ -} - long kvmppc_h_read(struct kvm_vcpu *vcpu, unsigned long flags, unsigned long pte_index) { struct kvm *kvm = vcpu->kvm; unsigned long *hpte, r; int i, n = 1; + struct revmap_entry *rev = NULL; - if (pte_index >= (HPT_NPTEG << 3)) + if (pte_index >= HPT_NPTE) return H_PARAMETER; if (flags & H_READ_4) { pte_index &= ~3; n = 4; } + if (flags & H_R_XLATE) + rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); for (i = 0; i < n; ++i, ++pte_index) { hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); r = hpte[1]; - if ((flags & H_R_XLATE) && (hpte[0] & HPTE_V_VALID)) - r = reverse_xlate(kvm, r & HPTE_R_RPN) | - (r & ~HPTE_R_RPN); + if (hpte[0] & HPTE_V_VALID) { + if (rev) + r = rev[i].guest_rpte; + else + r = hpte[1] | HPTE_R_RPN; + } vcpu->arch.gpr[4 + i * 2] = hpte[0]; vcpu->arch.gpr[5 + i * 2] = r; } -- cgit v1.2.3 From b2b2f16508de10bb1863bdd4ec1fa212111df5b4 Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Mon, 12 Dec 2011 12:28:21 +0000 Subject: KVM: PPC: Keep page physical addresses in per-slot arrays This allocates an array for each memory slot that is added to store the physical addresses of the pages in the slot. This array is vmalloc'd and accessed in kvmppc_h_enter using real_vmalloc_addr(). This allows us to remove the ram_pginfo field from the kvm_arch struct, and removes the 64GB guest RAM limit that we had. We use the low-order bits of the array entries to store a flag indicating that we have done get_page on the corresponding page, and therefore need to call put_page when we are finished with the page. Currently this is set for all pages except those in our special RMO regions. Signed-off-by: Paul Mackerras Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_host.h | 9 ++- arch/powerpc/kvm/book3s_64_mmu_hv.c | 18 +++--- arch/powerpc/kvm/book3s_hv.c | 114 +++++++++++++++++------------------- arch/powerpc/kvm/book3s_hv_rm_mmu.c | 41 +++++++++++-- 4 files changed, 107 insertions(+), 75 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 629df2ed22f..7a17ab5b905 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -38,6 +38,7 @@ #define KVM_MEMORY_SLOTS 32 /* memory slots that does not exposed to userspace */ #define KVM_PRIVATE_MEM_SLOTS 4 +#define KVM_MEM_SLOTS_NUM (KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS) #ifdef CONFIG_KVM_MMIO #define KVM_COALESCED_MMIO_PAGE_OFFSET 1 @@ -175,25 +176,27 @@ struct revmap_entry { unsigned long guest_rpte; }; +/* Low-order bits in kvm->arch.slot_phys[][] */ +#define KVMPPC_GOT_PAGE 0x80 + struct kvm_arch { #ifdef CONFIG_KVM_BOOK3S_64_HV unsigned long hpt_virt; struct revmap_entry *revmap; - unsigned long ram_npages; unsigned long ram_psize; unsigned long ram_porder; - struct kvmppc_pginfo *ram_pginfo; unsigned int lpid; unsigned int host_lpid; unsigned long host_lpcr; unsigned long sdr1; unsigned long host_sdr1; int tlbie_lock; - int n_rma_pages; unsigned long lpcr; unsigned long rmor; struct kvmppc_rma_info *rma; struct list_head spapr_tce_tables; + unsigned long *slot_phys[KVM_MEM_SLOTS_NUM]; + int slot_npages[KVM_MEM_SLOTS_NUM]; unsigned short last_vcpu[NR_CPUS]; struct kvmppc_vcore *vcores[KVM_MAX_VCORES]; #endif /* CONFIG_KVM_BOOK3S_64_HV */ diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index 80ece8de407..e4c60698f41 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -98,16 +98,16 @@ void kvmppc_free_hpt(struct kvm *kvm) void kvmppc_map_vrma(struct kvm *kvm, struct kvm_userspace_memory_region *mem) { unsigned long i; - unsigned long npages = kvm->arch.ram_npages; - unsigned long pfn; + unsigned long npages; + unsigned long pa; unsigned long *hpte; unsigned long hash; unsigned long porder = kvm->arch.ram_porder; struct revmap_entry *rev; - struct kvmppc_pginfo *pginfo = kvm->arch.ram_pginfo; + unsigned long *physp; - if (!pginfo) - return; + physp = kvm->arch.slot_phys[mem->slot]; + npages = kvm->arch.slot_npages[mem->slot]; /* VRMA can't be > 1TB */ if (npages > 1ul << (40 - porder)) @@ -117,9 +117,10 @@ void kvmppc_map_vrma(struct kvm *kvm, struct kvm_userspace_memory_region *mem) npages = HPT_NPTEG; for (i = 0; i < npages; ++i) { - pfn = pginfo[i].pfn; - if (!pfn) + pa = physp[i]; + if (!pa) break; + pa &= PAGE_MASK; /* can't use hpt_hash since va > 64 bits */ hash = (i ^ (VRMA_VSID ^ (VRMA_VSID << 25))) & HPT_HASH_MASK; /* @@ -131,8 +132,7 @@ void kvmppc_map_vrma(struct kvm *kvm, struct kvm_userspace_memory_region *mem) hash = (hash << 3) + 7; hpte = (unsigned long *) (kvm->arch.hpt_virt + (hash << 4)); /* HPTE low word - RPN, protection, etc. */ - hpte[1] = (pfn << PAGE_SHIFT) | HPTE_R_R | HPTE_R_C | - HPTE_R_M | PP_RWXX; + hpte[1] = pa | HPTE_R_R | HPTE_R_C | HPTE_R_M | PP_RWXX; smp_wmb(); hpte[0] = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) | (i << (VRMA_PAGE_ORDER - 16)) | HPTE_V_BOLTED | diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index b1e3b9c1326..a84fedc48d9 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -50,14 +50,6 @@ #include #include -/* - * For now, limit memory to 64GB and require it to be large pages. - * This value is chosen because it makes the ram_pginfo array be - * 64kB in size, which is about as large as we want to be trying - * to allocate with kmalloc. - */ -#define MAX_MEM_ORDER 36 - #define LARGE_PAGE_ORDER 24 /* 16MB pages */ /* #define EXIT_DEBUG */ @@ -147,10 +139,12 @@ static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu, unsigned long vcpuid, unsigned long vpa) { struct kvm *kvm = vcpu->kvm; - unsigned long pg_index, ra, len; + unsigned long gfn, pg_index, ra, len; unsigned long pg_offset; void *va; struct kvm_vcpu *tvcpu; + struct kvm_memory_slot *memslot; + unsigned long *physp; tvcpu = kvmppc_find_vcpu(kvm, vcpuid); if (!tvcpu) @@ -164,14 +158,20 @@ static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu, if (vpa & 0x7f) return H_PARAMETER; /* registering new area; convert logical addr to real */ - pg_index = vpa >> kvm->arch.ram_porder; - pg_offset = vpa & (kvm->arch.ram_psize - 1); - if (pg_index >= kvm->arch.ram_npages) + gfn = vpa >> PAGE_SHIFT; + memslot = gfn_to_memslot(kvm, gfn); + if (!memslot || !(memslot->flags & KVM_MEMSLOT_INVALID)) + return H_PARAMETER; + physp = kvm->arch.slot_phys[memslot->id]; + if (!physp) return H_PARAMETER; - if (kvm->arch.ram_pginfo[pg_index].pfn == 0) + pg_index = (gfn - memslot->base_gfn) >> + (kvm->arch.ram_porder - PAGE_SHIFT); + pg_offset = vpa & (kvm->arch.ram_psize - 1); + ra = physp[pg_index]; + if (!ra) return H_PARAMETER; - ra = kvm->arch.ram_pginfo[pg_index].pfn << PAGE_SHIFT; - ra |= pg_offset; + ra = (ra & PAGE_MASK) | pg_offset; va = __va(ra); if (flags <= 1) len = *(unsigned short *)(va + 4); @@ -1075,12 +1075,11 @@ int kvmppc_core_prepare_memory_region(struct kvm *kvm, struct kvm_userspace_memory_region *mem) { unsigned long psize, porder; - unsigned long i, npages, totalpages; - unsigned long pg_ix; - struct kvmppc_pginfo *pginfo; + unsigned long i, npages; unsigned long hva; struct kvmppc_rma_info *ri = NULL; struct page *page; + unsigned long *phys; /* For now, only allow 16MB pages */ porder = LARGE_PAGE_ORDER; @@ -1092,20 +1091,21 @@ int kvmppc_core_prepare_memory_region(struct kvm *kvm, return -EINVAL; } + /* Allocate a slot_phys array */ npages = mem->memory_size >> porder; - totalpages = (mem->guest_phys_addr + mem->memory_size) >> porder; - - /* More memory than we have space to track? */ - if (totalpages > (1ul << (MAX_MEM_ORDER - LARGE_PAGE_ORDER))) - return -EINVAL; + phys = kvm->arch.slot_phys[mem->slot]; + if (!phys) { + phys = vzalloc(npages * sizeof(unsigned long)); + if (!phys) + return -ENOMEM; + kvm->arch.slot_phys[mem->slot] = phys; + kvm->arch.slot_npages[mem->slot] = npages; + } /* Do we already have an RMA registered? */ if (mem->guest_phys_addr == 0 && kvm->arch.rma) return -EINVAL; - if (totalpages > kvm->arch.ram_npages) - kvm->arch.ram_npages = totalpages; - /* Is this one of our preallocated RMAs? */ if (mem->guest_phys_addr == 0) { struct vm_area_struct *vma; @@ -1138,7 +1138,6 @@ int kvmppc_core_prepare_memory_region(struct kvm *kvm, } atomic_inc(&ri->use_count); kvm->arch.rma = ri; - kvm->arch.n_rma_pages = rma_size >> porder; /* Update LPCR and RMOR */ lpcr = kvm->arch.lpcr; @@ -1162,12 +1161,9 @@ int kvmppc_core_prepare_memory_region(struct kvm *kvm, ri->base_pfn << PAGE_SHIFT, rma_size, lpcr); } - pg_ix = mem->guest_phys_addr >> porder; - pginfo = kvm->arch.ram_pginfo + pg_ix; - for (i = 0; i < npages; ++i, ++pg_ix) { - if (ri && pg_ix < kvm->arch.n_rma_pages) { - pginfo[i].pfn = ri->base_pfn + - (pg_ix << (porder - PAGE_SHIFT)); + for (i = 0; i < npages; ++i) { + if (ri && i < ri->npages) { + phys[i] = (ri->base_pfn << PAGE_SHIFT) + (i << porder); continue; } hva = mem->userspace_addr + (i << porder); @@ -1183,7 +1179,7 @@ int kvmppc_core_prepare_memory_region(struct kvm *kvm, hva, compound_order(page)); goto err; } - pginfo[i].pfn = page_to_pfn(page); + phys[i] = (page_to_pfn(page) << PAGE_SHIFT) | KVMPPC_GOT_PAGE; } return 0; @@ -1192,6 +1188,28 @@ int kvmppc_core_prepare_memory_region(struct kvm *kvm, return -EINVAL; } +static void unpin_slot(struct kvm *kvm, int slot_id) +{ + unsigned long *physp; + unsigned long j, npages, pfn; + struct page *page; + + physp = kvm->arch.slot_phys[slot_id]; + npages = kvm->arch.slot_npages[slot_id]; + if (physp) { + for (j = 0; j < npages; j++) { + if (!(physp[j] & KVMPPC_GOT_PAGE)) + continue; + pfn = physp[j] >> PAGE_SHIFT; + page = pfn_to_page(pfn); + SetPageDirty(page); + put_page(page); + } + vfree(physp); + kvm->arch.slot_phys[slot_id] = NULL; + } +} + void kvmppc_core_commit_memory_region(struct kvm *kvm, struct kvm_userspace_memory_region *mem) { @@ -1203,8 +1221,6 @@ void kvmppc_core_commit_memory_region(struct kvm *kvm, int kvmppc_core_init_vm(struct kvm *kvm) { long r; - unsigned long npages = 1ul << (MAX_MEM_ORDER - LARGE_PAGE_ORDER); - long err = -ENOMEM; unsigned long lpcr; /* Allocate hashed page table */ @@ -1214,19 +1230,9 @@ int kvmppc_core_init_vm(struct kvm *kvm) INIT_LIST_HEAD(&kvm->arch.spapr_tce_tables); - kvm->arch.ram_pginfo = kzalloc(npages * sizeof(struct kvmppc_pginfo), - GFP_KERNEL); - if (!kvm->arch.ram_pginfo) { - pr_err("kvmppc_core_init_vm: couldn't alloc %lu bytes\n", - npages * sizeof(struct kvmppc_pginfo)); - goto out_free; - } - - kvm->arch.ram_npages = 0; kvm->arch.ram_psize = 1ul << LARGE_PAGE_ORDER; kvm->arch.ram_porder = LARGE_PAGE_ORDER; kvm->arch.rma = NULL; - kvm->arch.n_rma_pages = 0; kvm->arch.host_sdr1 = mfspr(SPRN_SDR1); @@ -1249,25 +1255,15 @@ int kvmppc_core_init_vm(struct kvm *kvm) kvm->arch.lpcr = lpcr; return 0; - - out_free: - kvmppc_free_hpt(kvm); - return err; } void kvmppc_core_destroy_vm(struct kvm *kvm) { - struct kvmppc_pginfo *pginfo; unsigned long i; - if (kvm->arch.ram_pginfo) { - pginfo = kvm->arch.ram_pginfo; - kvm->arch.ram_pginfo = NULL; - for (i = kvm->arch.n_rma_pages; i < kvm->arch.ram_npages; ++i) - if (pginfo[i].pfn) - put_page(pfn_to_page(pginfo[i].pfn)); - kfree(pginfo); - } + for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) + unpin_slot(kvm, i); + if (kvm->arch.rma) { kvm_release_rma(kvm->arch.rma); kvm->arch.rma = NULL; diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c index 614849360a0..84dae821b23 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c @@ -20,6 +20,25 @@ #include #include +/* + * Since this file is built in even if KVM is a module, we need + * a local copy of this function for the case where kvm_main.c is + * modular. + */ +static struct kvm_memory_slot *builtin_gfn_to_memslot(struct kvm *kvm, + gfn_t gfn) +{ + struct kvm_memslots *slots; + struct kvm_memory_slot *memslot; + + slots = kvm_memslots(kvm); + kvm_for_each_memslot(memslot, slots) + if (gfn >= memslot->base_gfn && + gfn < memslot->base_gfn + memslot->npages) + return memslot; + return NULL; +} + /* Translate address of a vmalloc'd thing to a linear map address */ static void *real_vmalloc_addr(void *x) { @@ -59,10 +78,12 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, { unsigned long porder; struct kvm *kvm = vcpu->kvm; - unsigned long i, lpn, pa; + unsigned long i, gfn, lpn, pa; unsigned long *hpte; struct revmap_entry *rev; unsigned long g_ptel = ptel; + struct kvm_memory_slot *memslot; + unsigned long *physp; /* only handle 4k, 64k and 16M pages for now */ porder = 12; @@ -80,12 +101,24 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, } else return H_PARAMETER; } - lpn = (ptel & HPTE_R_RPN) >> kvm->arch.ram_porder; - if (lpn >= kvm->arch.ram_npages || porder > kvm->arch.ram_porder) + if (porder > kvm->arch.ram_porder) return H_PARAMETER; - pa = kvm->arch.ram_pginfo[lpn].pfn << PAGE_SHIFT; + + gfn = ((ptel & HPTE_R_RPN) & ~((1ul << porder) - 1)) >> PAGE_SHIFT; + memslot = builtin_gfn_to_memslot(kvm, gfn); + if (!(memslot && !(memslot->flags & KVM_MEMSLOT_INVALID))) + return H_PARAMETER; + physp = kvm->arch.slot_phys[memslot->id]; + if (!physp) + return H_PARAMETER; + + lpn = (gfn - memslot->base_gfn) >> (kvm->arch.ram_porder - PAGE_SHIFT); + physp = real_vmalloc_addr(physp + lpn); + pa = *physp; if (!pa) return H_PARAMETER; + pa &= PAGE_MASK; + /* Check WIMG */ if ((ptel & HPTE_R_WIMG) != HPTE_R_M && (ptel & HPTE_R_WIMG) != (HPTE_R_W | HPTE_R_I | HPTE_R_M)) -- cgit v1.2.3 From 93e602490c1da83162a8b6ba86b4b48a7a0f0c9e Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Mon, 12 Dec 2011 12:28:55 +0000 Subject: KVM: PPC: Add an interface for pinning guest pages in Book3s HV guests This adds two new functions, kvmppc_pin_guest_page() and kvmppc_unpin_guest_page(), and uses them to pin the guest pages where the guest has registered areas of memory for the hypervisor to update, (i.e. the per-cpu virtual processor areas, SLB shadow buffers and dispatch trace logs) and then unpin them when they are no longer required. Although it is not strictly necessary to pin the pages at this point, since all guest pages are already pinned, later commits in this series will mean that guest pages aren't all pinned. Signed-off-by: Paul Mackerras Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_book3s.h | 3 ++ arch/powerpc/kvm/book3s_64_mmu_hv.c | 38 ++++++++++++++++++++ arch/powerpc/kvm/book3s_hv.c | 67 +++++++++++++++++++---------------- 3 files changed, 78 insertions(+), 30 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h index c941c21a189..bcf6f4f52a2 100644 --- a/arch/powerpc/include/asm/kvm_book3s.h +++ b/arch/powerpc/include/asm/kvm_book3s.h @@ -138,6 +138,9 @@ extern void kvmppc_set_bat(struct kvm_vcpu *vcpu, struct kvmppc_bat *bat, extern void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr); extern int kvmppc_emulate_paired_single(struct kvm_run *run, struct kvm_vcpu *vcpu); extern pfn_t kvmppc_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn); +extern void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long addr, + unsigned long *nb_ret); +extern void kvmppc_unpin_guest_page(struct kvm *kvm, void *addr); extern void kvmppc_entry_trampoline(void); extern void kvmppc_hv_entry_trampoline(void); diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index e4c60698f41..dcd39dc64f0 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -184,6 +184,44 @@ static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, return -ENOENT; } +void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa, + unsigned long *nb_ret) +{ + struct kvm_memory_slot *memslot; + unsigned long gfn = gpa >> PAGE_SHIFT; + struct page *page; + unsigned long offset; + unsigned long pfn, pa; + unsigned long *physp; + + memslot = gfn_to_memslot(kvm, gfn); + if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) + return NULL; + physp = kvm->arch.slot_phys[memslot->id]; + if (!physp) + return NULL; + physp += (gfn - memslot->base_gfn) >> + (kvm->arch.ram_porder - PAGE_SHIFT); + pa = *physp; + if (!pa) + return NULL; + pfn = pa >> PAGE_SHIFT; + page = pfn_to_page(pfn); + get_page(page); + offset = gpa & (kvm->arch.ram_psize - 1); + if (nb_ret) + *nb_ret = kvm->arch.ram_psize - offset; + return page_address(page) + offset; +} + +void kvmppc_unpin_guest_page(struct kvm *kvm, void *va) +{ + struct page *page = virt_to_page(va); + + page = compound_head(page); + put_page(page); +} + void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu) { struct kvmppc_mmu *mmu = &vcpu->arch.mmu; diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index a84fedc48d9..82d71388eac 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -139,12 +139,10 @@ static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu, unsigned long vcpuid, unsigned long vpa) { struct kvm *kvm = vcpu->kvm; - unsigned long gfn, pg_index, ra, len; - unsigned long pg_offset; + unsigned long len, nb; void *va; struct kvm_vcpu *tvcpu; - struct kvm_memory_slot *memslot; - unsigned long *physp; + int err = H_PARAMETER; tvcpu = kvmppc_find_vcpu(kvm, vcpuid); if (!tvcpu) @@ -157,51 +155,41 @@ static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu, if (flags < 4) { if (vpa & 0x7f) return H_PARAMETER; + if (flags >= 2 && !tvcpu->arch.vpa) + return H_RESOURCE; /* registering new area; convert logical addr to real */ - gfn = vpa >> PAGE_SHIFT; - memslot = gfn_to_memslot(kvm, gfn); - if (!memslot || !(memslot->flags & KVM_MEMSLOT_INVALID)) - return H_PARAMETER; - physp = kvm->arch.slot_phys[memslot->id]; - if (!physp) - return H_PARAMETER; - pg_index = (gfn - memslot->base_gfn) >> - (kvm->arch.ram_porder - PAGE_SHIFT); - pg_offset = vpa & (kvm->arch.ram_psize - 1); - ra = physp[pg_index]; - if (!ra) + va = kvmppc_pin_guest_page(kvm, vpa, &nb); + if (va == NULL) return H_PARAMETER; - ra = (ra & PAGE_MASK) | pg_offset; - va = __va(ra); if (flags <= 1) len = *(unsigned short *)(va + 4); else len = *(unsigned int *)(va + 4); - if (pg_offset + len > kvm->arch.ram_psize) - return H_PARAMETER; + if (len > nb) + goto out_unpin; switch (flags) { case 1: /* register VPA */ if (len < 640) - return H_PARAMETER; + goto out_unpin; + if (tvcpu->arch.vpa) + kvmppc_unpin_guest_page(kvm, vcpu->arch.vpa); tvcpu->arch.vpa = va; init_vpa(vcpu, va); break; case 2: /* register DTL */ if (len < 48) - return H_PARAMETER; - if (!tvcpu->arch.vpa) - return H_RESOURCE; + goto out_unpin; len -= len % 48; + if (tvcpu->arch.dtl) + kvmppc_unpin_guest_page(kvm, vcpu->arch.dtl); tvcpu->arch.dtl = va; tvcpu->arch.dtl_end = va + len; break; case 3: /* register SLB shadow buffer */ - if (len < 8) - return H_PARAMETER; - if (!tvcpu->arch.vpa) - return H_RESOURCE; - tvcpu->arch.slb_shadow = va; - len = (len - 16) / 16; + if (len < 16) + goto out_unpin; + if (tvcpu->arch.slb_shadow) + kvmppc_unpin_guest_page(kvm, vcpu->arch.slb_shadow); tvcpu->arch.slb_shadow = va; break; } @@ -210,17 +198,30 @@ static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu, case 5: /* unregister VPA */ if (tvcpu->arch.slb_shadow || tvcpu->arch.dtl) return H_RESOURCE; + if (!tvcpu->arch.vpa) + break; + kvmppc_unpin_guest_page(kvm, tvcpu->arch.vpa); tvcpu->arch.vpa = NULL; break; case 6: /* unregister DTL */ + if (!tvcpu->arch.dtl) + break; + kvmppc_unpin_guest_page(kvm, tvcpu->arch.dtl); tvcpu->arch.dtl = NULL; break; case 7: /* unregister SLB shadow buffer */ + if (!tvcpu->arch.slb_shadow) + break; + kvmppc_unpin_guest_page(kvm, tvcpu->arch.slb_shadow); tvcpu->arch.slb_shadow = NULL; break; } } return H_SUCCESS; + + out_unpin: + kvmppc_unpin_guest_page(kvm, va); + return err; } int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu) @@ -470,6 +471,12 @@ out: void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu) { + if (vcpu->arch.dtl) + kvmppc_unpin_guest_page(vcpu->kvm, vcpu->arch.dtl); + if (vcpu->arch.slb_shadow) + kvmppc_unpin_guest_page(vcpu->kvm, vcpu->arch.slb_shadow); + if (vcpu->arch.vpa) + kvmppc_unpin_guest_page(vcpu->kvm, vcpu->arch.vpa); kvm_vcpu_uninit(vcpu); kfree(vcpu); } -- cgit v1.2.3 From 075295dd322b0c0de0c9ecf8e0cb19ee813438ed Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Mon, 12 Dec 2011 12:30:16 +0000 Subject: KVM: PPC: Make the H_ENTER hcall more reliable At present, our implementation of H_ENTER only makes one try at locking each slot that it looks at, and doesn't even retry the ldarx/stdcx. atomic update sequence that it uses to attempt to lock the slot. Thus it can return the H_PTEG_FULL error unnecessarily, particularly when the H_EXACT flag is set, meaning that the caller wants a specific PTEG slot. This improves the situation by making a second pass when no free HPTE slot is found, where we spin until we succeed in locking each slot in turn and then check whether it is full while we hold the lock. If the second pass fails, then we return H_PTEG_FULL. This also moves lock_hpte to a header file (since later commits in this series will need to use it from other source files) and renames it to try_lock_hpte, which is a somewhat less misleading name. Signed-off-by: Paul Mackerras Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_book3s_64.h | 25 +++++++++++++ arch/powerpc/kvm/book3s_hv_rm_mmu.c | 63 +++++++++++++++++--------------- 2 files changed, 59 insertions(+), 29 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h index fa3dc79af70..300ec04a838 100644 --- a/arch/powerpc/include/asm/kvm_book3s_64.h +++ b/arch/powerpc/include/asm/kvm_book3s_64.h @@ -43,6 +43,31 @@ static inline void svcpu_put(struct kvmppc_book3s_shadow_vcpu *svcpu) #define HPT_HASH_MASK (HPT_NPTEG - 1) #endif +/* + * We use a lock bit in HPTE dword 0 to synchronize updates and + * accesses to each HPTE, and another bit to indicate non-present + * HPTEs. + */ +#define HPTE_V_HVLOCK 0x40UL + +static inline long try_lock_hpte(unsigned long *hpte, unsigned long bits) +{ + unsigned long tmp, old; + + asm volatile(" ldarx %0,0,%2\n" + " and. %1,%0,%3\n" + " bne 2f\n" + " ori %0,%0,%4\n" + " stdcx. %0,0,%2\n" + " beq+ 2f\n" + " li %1,%3\n" + "2: isync" + : "=&r" (tmp), "=&r" (old) + : "r" (hpte), "r" (bits), "i" (HPTE_V_HVLOCK) + : "cc", "memory"); + return old == 0; +} + static inline unsigned long compute_tlbie_rb(unsigned long v, unsigned long r, unsigned long pte_index) { diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c index 84dae821b23..a28a6030ec9 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c @@ -53,26 +53,6 @@ static void *real_vmalloc_addr(void *x) return __va(addr); } -#define HPTE_V_HVLOCK 0x40UL - -static inline long lock_hpte(unsigned long *hpte, unsigned long bits) -{ - unsigned long tmp, old; - - asm volatile(" ldarx %0,0,%2\n" - " and. %1,%0,%3\n" - " bne 2f\n" - " ori %0,%0,%4\n" - " stdcx. %0,0,%2\n" - " beq+ 2f\n" - " li %1,%3\n" - "2: isync" - : "=&r" (tmp), "=&r" (old) - : "r" (hpte), "r" (bits), "i" (HPTE_V_HVLOCK) - : "cc", "memory"); - return old == 0; -} - long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, long pte_index, unsigned long pteh, unsigned long ptel) { @@ -126,24 +106,49 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, pteh &= ~0x60UL; ptel &= ~(HPTE_R_PP0 - kvm->arch.ram_psize); ptel |= pa; + if (pte_index >= HPT_NPTE) return H_PARAMETER; if (likely((flags & H_EXACT) == 0)) { pte_index &= ~7UL; hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); - for (i = 0; ; ++i) { - if (i == 8) - return H_PTEG_FULL; + for (i = 0; i < 8; ++i) { if ((*hpte & HPTE_V_VALID) == 0 && - lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID)) + try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID)) break; hpte += 2; } + if (i == 8) { + /* + * Since try_lock_hpte doesn't retry (not even stdcx. + * failures), it could be that there is a free slot + * but we transiently failed to lock it. Try again, + * actually locking each slot and checking it. + */ + hpte -= 16; + for (i = 0; i < 8; ++i) { + while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) + cpu_relax(); + if ((*hpte & HPTE_V_VALID) == 0) + break; + *hpte &= ~HPTE_V_HVLOCK; + hpte += 2; + } + if (i == 8) + return H_PTEG_FULL; + } pte_index += i; } else { hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); - if (!lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID)) - return H_PTEG_FULL; + if (!try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID)) { + /* Lock the slot and check again */ + while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) + cpu_relax(); + if (*hpte & HPTE_V_VALID) { + *hpte &= ~HPTE_V_HVLOCK; + return H_PTEG_FULL; + } + } } /* Save away the guest's idea of the second HPTE dword */ @@ -189,7 +194,7 @@ long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags, if (pte_index >= HPT_NPTE) return H_PARAMETER; hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); - while (!lock_hpte(hpte, HPTE_V_HVLOCK)) + while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) cpu_relax(); if ((hpte[0] & HPTE_V_VALID) == 0 || ((flags & H_AVPN) && (hpte[0] & ~0x7fUL) != avpn) || @@ -248,7 +253,7 @@ long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu) break; } hp = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); - while (!lock_hpte(hp, HPTE_V_HVLOCK)) + while (!try_lock_hpte(hp, HPTE_V_HVLOCK)) cpu_relax(); found = 0; if (hp[0] & HPTE_V_VALID) { @@ -310,7 +315,7 @@ long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags, if (pte_index >= HPT_NPTE) return H_PARAMETER; hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); - while (!lock_hpte(hpte, HPTE_V_HVLOCK)) + while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) cpu_relax(); if ((hpte[0] & HPTE_V_VALID) == 0 || ((flags & H_AVPN) && (hpte[0] & ~0x7fUL) != avpn)) { -- cgit v1.2.3 From c77162dee7aff6ab5f075da9b60f649cbbeb86cc Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Mon, 12 Dec 2011 12:31:00 +0000 Subject: KVM: PPC: Only get pages when actually needed, not in prepare_memory_region() This removes the code from kvmppc_core_prepare_memory_region() that looked up the VMA for the region being added and called hva_to_page to get the pfns for the memory. We have no guarantee that there will be anything mapped there at the time of the KVM_SET_USER_MEMORY_REGION ioctl call; userspace can do that ioctl and then map memory into the region later. Instead we defer looking up the pfn for each memory page until it is needed, which generally means when the guest does an H_ENTER hcall on the page. Since we can't call get_user_pages in real mode, if we don't already have the pfn for the page, kvmppc_h_enter() will return H_TOO_HARD and we then call kvmppc_virtmode_h_enter() once we get back to kernel context. That calls kvmppc_get_guest_page() to get the pfn for the page, and then calls back to kvmppc_h_enter() to redo the HPTE insertion. When the first vcpu starts executing, we need to have the RMO or VRMA region mapped so that the guest's real mode accesses will work. Thus we now have a check in kvmppc_vcpu_run() to see if the RMO/VRMA is set up and if not, call kvmppc_hv_setup_rma(). It checks if the memslot starting at guest physical 0 now has RMO memory mapped there; if so it sets it up for the guest, otherwise on POWER7 it sets up the VRMA. The function that does that, kvmppc_map_vrma, is now a bit simpler, as it calls kvmppc_virtmode_h_enter instead of creating the HPTE itself. Since we are now potentially updating entries in the slot_phys[] arrays from multiple vcpu threads, we now have a spinlock protecting those updates to ensure that we don't lose track of any references to pages. Signed-off-by: Paul Mackerras Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_book3s.h | 4 + arch/powerpc/include/asm/kvm_book3s_64.h | 12 ++ arch/powerpc/include/asm/kvm_host.h | 2 + arch/powerpc/include/asm/kvm_ppc.h | 4 +- arch/powerpc/kvm/book3s_64_mmu_hv.c | 130 +++++++++++++--- arch/powerpc/kvm/book3s_hv.c | 244 +++++++++++++++++-------------- arch/powerpc/kvm/book3s_hv_rm_mmu.c | 54 +++---- 7 files changed, 290 insertions(+), 160 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h index bcf6f4f52a2..c700f43ba17 100644 --- a/arch/powerpc/include/asm/kvm_book3s.h +++ b/arch/powerpc/include/asm/kvm_book3s.h @@ -141,6 +141,10 @@ extern pfn_t kvmppc_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn); extern void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long addr, unsigned long *nb_ret); extern void kvmppc_unpin_guest_page(struct kvm *kvm, void *addr); +extern long kvmppc_virtmode_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, + long pte_index, unsigned long pteh, unsigned long ptel); +extern long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, + long pte_index, unsigned long pteh, unsigned long ptel); extern void kvmppc_entry_trampoline(void); extern void kvmppc_hv_entry_trampoline(void); diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h index 300ec04a838..7e6f2ede44a 100644 --- a/arch/powerpc/include/asm/kvm_book3s_64.h +++ b/arch/powerpc/include/asm/kvm_book3s_64.h @@ -101,4 +101,16 @@ static inline unsigned long compute_tlbie_rb(unsigned long v, unsigned long r, return rb; } +static inline unsigned long hpte_page_size(unsigned long h, unsigned long l) +{ + /* only handle 4k, 64k and 16M pages for now */ + if (!(h & HPTE_V_LARGE)) + return 1ul << 12; /* 4k page */ + if ((l & 0xf000) == 0x1000 && cpu_has_feature(CPU_FTR_ARCH_206)) + return 1ul << 16; /* 64k page */ + if ((l & 0xff000) == 0) + return 1ul << 24; /* 16M page */ + return 0; /* error */ +} + #endif /* __ASM_KVM_BOOK3S_64_H__ */ diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 7a17ab5b905..beb22ba71e2 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -194,7 +194,9 @@ struct kvm_arch { unsigned long lpcr; unsigned long rmor; struct kvmppc_rma_info *rma; + int rma_setup_done; struct list_head spapr_tce_tables; + spinlock_t slot_phys_lock; unsigned long *slot_phys[KVM_MEM_SLOTS_NUM]; int slot_npages[KVM_MEM_SLOTS_NUM]; unsigned short last_vcpu[NR_CPUS]; diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h index 5192c2e7058..1458c6740ea 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -121,8 +121,8 @@ extern long kvmppc_alloc_hpt(struct kvm *kvm); extern void kvmppc_free_hpt(struct kvm *kvm); extern long kvmppc_prepare_vrma(struct kvm *kvm, struct kvm_userspace_memory_region *mem); -extern void kvmppc_map_vrma(struct kvm *kvm, - struct kvm_userspace_memory_region *mem); +extern void kvmppc_map_vrma(struct kvm_vcpu *vcpu, + struct kvm_memory_slot *memslot); extern int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu); extern long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm, struct kvm_create_spapr_tce *args); diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index dcd39dc64f0..87016ccd864 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -95,19 +95,17 @@ void kvmppc_free_hpt(struct kvm *kvm) free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT); } -void kvmppc_map_vrma(struct kvm *kvm, struct kvm_userspace_memory_region *mem) +void kvmppc_map_vrma(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot) { + struct kvm *kvm = vcpu->kvm; unsigned long i; unsigned long npages; - unsigned long pa; - unsigned long *hpte; - unsigned long hash; + unsigned long hp_v, hp_r; + unsigned long addr, hash; unsigned long porder = kvm->arch.ram_porder; - struct revmap_entry *rev; - unsigned long *physp; + long ret; - physp = kvm->arch.slot_phys[mem->slot]; - npages = kvm->arch.slot_npages[mem->slot]; + npages = kvm->arch.slot_npages[memslot->id]; /* VRMA can't be > 1TB */ if (npages > 1ul << (40 - porder)) @@ -117,10 +115,7 @@ void kvmppc_map_vrma(struct kvm *kvm, struct kvm_userspace_memory_region *mem) npages = HPT_NPTEG; for (i = 0; i < npages; ++i) { - pa = physp[i]; - if (!pa) - break; - pa &= PAGE_MASK; + addr = i << porder; /* can't use hpt_hash since va > 64 bits */ hash = (i ^ (VRMA_VSID ^ (VRMA_VSID << 25))) & HPT_HASH_MASK; /* @@ -130,18 +125,16 @@ void kvmppc_map_vrma(struct kvm *kvm, struct kvm_userspace_memory_region *mem) * is available and use it. */ hash = (hash << 3) + 7; - hpte = (unsigned long *) (kvm->arch.hpt_virt + (hash << 4)); - /* HPTE low word - RPN, protection, etc. */ - hpte[1] = pa | HPTE_R_R | HPTE_R_C | HPTE_R_M | PP_RWXX; - smp_wmb(); - hpte[0] = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) | + hp_v = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) | (i << (VRMA_PAGE_ORDER - 16)) | HPTE_V_BOLTED | HPTE_V_LARGE | HPTE_V_VALID; - - /* Reverse map info */ - rev = &kvm->arch.revmap[hash]; - rev->guest_rpte = (i << porder) | HPTE_R_R | HPTE_R_C | - HPTE_R_M | PP_RWXX; + hp_r = addr | HPTE_R_R | HPTE_R_C | HPTE_R_M | PP_RWXX; + ret = kvmppc_virtmode_h_enter(vcpu, H_EXACT, hash, hp_v, hp_r); + if (ret != H_SUCCESS) { + pr_err("KVM: map_vrma at %lx failed, ret=%ld\n", + addr, ret); + break; + } } } @@ -178,6 +171,92 @@ static void kvmppc_mmu_book3s_64_hv_reset_msr(struct kvm_vcpu *vcpu) kvmppc_set_msr(vcpu, MSR_SF | MSR_ME); } +/* + * This is called to get a reference to a guest page if there isn't + * one already in the kvm->arch.slot_phys[][] arrays. + */ +static long kvmppc_get_guest_page(struct kvm *kvm, unsigned long gfn, + struct kvm_memory_slot *memslot) +{ + unsigned long start; + long np; + struct page *page, *pages[1]; + unsigned long *physp; + unsigned long pfn, i; + + physp = kvm->arch.slot_phys[memslot->id]; + if (!physp) + return -EINVAL; + i = (gfn - memslot->base_gfn) >> (kvm->arch.ram_porder - PAGE_SHIFT); + if (physp[i]) + return 0; + + page = NULL; + start = gfn_to_hva_memslot(memslot, gfn); + + /* Instantiate and get the page we want access to */ + np = get_user_pages_fast(start, 1, 1, pages); + if (np != 1) + return -EINVAL; + page = pages[0]; + + /* Check it's a 16MB page */ + if (!PageHead(page) || + compound_order(page) != (kvm->arch.ram_porder - PAGE_SHIFT)) { + pr_err("page at %lx isn't 16MB (o=%d)\n", + start, compound_order(page)); + put_page(page); + return -EINVAL; + } + pfn = page_to_pfn(page); + + spin_lock(&kvm->arch.slot_phys_lock); + if (!physp[i]) + physp[i] = (pfn << PAGE_SHIFT) | KVMPPC_GOT_PAGE; + else + put_page(page); + spin_unlock(&kvm->arch.slot_phys_lock); + + return 0; +} + +/* + * We come here on a H_ENTER call from the guest when + * we don't have the requested page pinned already. + */ +long kvmppc_virtmode_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, + long pte_index, unsigned long pteh, unsigned long ptel) +{ + struct kvm *kvm = vcpu->kvm; + unsigned long psize, gpa, gfn; + struct kvm_memory_slot *memslot; + long ret; + + psize = hpte_page_size(pteh, ptel); + if (!psize) + return H_PARAMETER; + + /* Find the memslot (if any) for this address */ + gpa = (ptel & HPTE_R_RPN) & ~(psize - 1); + gfn = gpa >> PAGE_SHIFT; + memslot = gfn_to_memslot(kvm, gfn); + if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) + return H_PARAMETER; + if (kvmppc_get_guest_page(kvm, gfn, memslot) < 0) + return H_PARAMETER; + + preempt_disable(); + ret = kvmppc_h_enter(vcpu, flags, pte_index, pteh, ptel); + preempt_enable(); + if (ret == H_TOO_HARD) { + /* this can't happen */ + pr_err("KVM: Oops, kvmppc_h_enter returned too hard!\n"); + ret = H_RESOURCE; /* or something */ + } + return ret; + +} + static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, struct kvmppc_pte *gpte, bool data) { @@ -203,8 +282,11 @@ void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa, physp += (gfn - memslot->base_gfn) >> (kvm->arch.ram_porder - PAGE_SHIFT); pa = *physp; - if (!pa) - return NULL; + if (!pa) { + if (kvmppc_get_guest_page(kvm, gfn, memslot) < 0) + return NULL; + pa = *physp; + } pfn = pa >> PAGE_SHIFT; page = pfn_to_page(pfn); get_page(page); diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 82d71388eac..ce5a13fb974 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -49,6 +49,7 @@ #include #include #include +#include #define LARGE_PAGE_ORDER 24 /* 16MB pages */ @@ -57,6 +58,7 @@ /* #define EXIT_DEBUG_INT */ static void kvmppc_end_cede(struct kvm_vcpu *vcpu); +static int kvmppc_hv_setup_rma(struct kvm_vcpu *vcpu); void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu) { @@ -231,6 +233,12 @@ int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu) struct kvm_vcpu *tvcpu; switch (req) { + case H_ENTER: + ret = kvmppc_virtmode_h_enter(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5), + kvmppc_get_gpr(vcpu, 6), + kvmppc_get_gpr(vcpu, 7)); + break; case H_CEDE: break; case H_PROD: @@ -851,9 +859,12 @@ int kvmppc_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu) return -EINTR; } - /* On PPC970, check that we have an RMA region */ - if (!vcpu->kvm->arch.rma && cpu_has_feature(CPU_FTR_ARCH_201)) - return -EPERM; + /* On the first time here, set up VRMA or RMA */ + if (!vcpu->kvm->arch.rma_setup_done) { + r = kvmppc_hv_setup_rma(vcpu); + if (r) + return r; + } flush_fp_to_thread(current); flush_altivec_to_thread(current); @@ -1063,34 +1074,15 @@ long kvm_vm_ioctl_allocate_rma(struct kvm *kvm, struct kvm_allocate_rma *ret) return fd; } -static struct page *hva_to_page(unsigned long addr) -{ - struct page *page[1]; - int npages; - - might_sleep(); - - npages = get_user_pages_fast(addr, 1, 1, page); - - if (unlikely(npages != 1)) - return 0; - - return page[0]; -} - int kvmppc_core_prepare_memory_region(struct kvm *kvm, struct kvm_userspace_memory_region *mem) { - unsigned long psize, porder; - unsigned long i, npages; - unsigned long hva; - struct kvmppc_rma_info *ri = NULL; - struct page *page; + unsigned long psize; + unsigned long npages; unsigned long *phys; - /* For now, only allow 16MB pages */ - porder = LARGE_PAGE_ORDER; - psize = 1ul << porder; + /* For now, only allow 16MB-aligned slots */ + psize = kvm->arch.ram_psize; if ((mem->memory_size & (psize - 1)) || (mem->guest_phys_addr & (psize - 1))) { pr_err("bad memory_size=%llx @ %llx\n", @@ -1099,7 +1091,7 @@ int kvmppc_core_prepare_memory_region(struct kvm *kvm, } /* Allocate a slot_phys array */ - npages = mem->memory_size >> porder; + npages = mem->memory_size >> kvm->arch.ram_porder; phys = kvm->arch.slot_phys[mem->slot]; if (!phys) { phys = vzalloc(npages * sizeof(unsigned long)); @@ -1109,39 +1101,110 @@ int kvmppc_core_prepare_memory_region(struct kvm *kvm, kvm->arch.slot_npages[mem->slot] = npages; } - /* Do we already have an RMA registered? */ - if (mem->guest_phys_addr == 0 && kvm->arch.rma) - return -EINVAL; + return 0; +} - /* Is this one of our preallocated RMAs? */ - if (mem->guest_phys_addr == 0) { - struct vm_area_struct *vma; - - down_read(¤t->mm->mmap_sem); - vma = find_vma(current->mm, mem->userspace_addr); - if (vma && vma->vm_file && - vma->vm_file->f_op == &kvm_rma_fops && - mem->userspace_addr == vma->vm_start) - ri = vma->vm_file->private_data; - up_read(¤t->mm->mmap_sem); - if (!ri && cpu_has_feature(CPU_FTR_ARCH_201)) { - pr_err("CPU requires an RMO\n"); - return -EINVAL; +static void unpin_slot(struct kvm *kvm, int slot_id) +{ + unsigned long *physp; + unsigned long j, npages, pfn; + struct page *page; + + physp = kvm->arch.slot_phys[slot_id]; + npages = kvm->arch.slot_npages[slot_id]; + if (physp) { + spin_lock(&kvm->arch.slot_phys_lock); + for (j = 0; j < npages; j++) { + if (!(physp[j] & KVMPPC_GOT_PAGE)) + continue; + pfn = physp[j] >> PAGE_SHIFT; + page = pfn_to_page(pfn); + SetPageDirty(page); + put_page(page); } + kvm->arch.slot_phys[slot_id] = NULL; + spin_unlock(&kvm->arch.slot_phys_lock); + vfree(physp); } +} + +void kvmppc_core_commit_memory_region(struct kvm *kvm, + struct kvm_userspace_memory_region *mem) +{ +} + +static int kvmppc_hv_setup_rma(struct kvm_vcpu *vcpu) +{ + int err = 0; + struct kvm *kvm = vcpu->kvm; + struct kvmppc_rma_info *ri = NULL; + unsigned long hva; + struct kvm_memory_slot *memslot; + struct vm_area_struct *vma; + unsigned long lpcr; + unsigned long psize, porder; + unsigned long rma_size; + unsigned long rmls; + unsigned long *physp; + unsigned long i, npages, pa; + + mutex_lock(&kvm->lock); + if (kvm->arch.rma_setup_done) + goto out; /* another vcpu beat us to it */ - if (ri) { - unsigned long rma_size; - unsigned long lpcr; - long rmls; + /* Look up the memslot for guest physical address 0 */ + memslot = gfn_to_memslot(kvm, 0); - rma_size = ri->npages << PAGE_SHIFT; - if (rma_size > mem->memory_size) - rma_size = mem->memory_size; + /* We must have some memory at 0 by now */ + err = -EINVAL; + if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) + goto out; + + /* Look up the VMA for the start of this memory slot */ + hva = memslot->userspace_addr; + down_read(¤t->mm->mmap_sem); + vma = find_vma(current->mm, hva); + if (!vma || vma->vm_start > hva || (vma->vm_flags & VM_IO)) + goto up_out; + + psize = vma_kernel_pagesize(vma); + if (psize != kvm->arch.ram_psize) + goto up_out; + + /* Is this one of our preallocated RMAs? */ + if (vma->vm_file && vma->vm_file->f_op == &kvm_rma_fops && + hva == vma->vm_start) + ri = vma->vm_file->private_data; + + up_read(¤t->mm->mmap_sem); + + if (!ri) { + /* On POWER7, use VRMA; on PPC970, give up */ + err = -EPERM; + if (cpu_has_feature(CPU_FTR_ARCH_201)) { + pr_err("KVM: CPU requires an RMO\n"); + goto out; + } + + /* Update VRMASD field in the LPCR */ + lpcr = kvm->arch.lpcr & ~(0x1fUL << LPCR_VRMASD_SH); + lpcr |= LPCR_VRMA_L; + kvm->arch.lpcr = lpcr; + + /* Create HPTEs in the hash page table for the VRMA */ + kvmppc_map_vrma(vcpu, memslot); + + } else { + /* Set up to use an RMO region */ + rma_size = ri->npages; + if (rma_size > memslot->npages) + rma_size = memslot->npages; + rma_size <<= PAGE_SHIFT; rmls = lpcr_rmls(rma_size); + err = -EINVAL; if (rmls < 0) { - pr_err("Can't use RMA of 0x%lx bytes\n", rma_size); - return -EINVAL; + pr_err("KVM: Can't use RMA of 0x%lx bytes\n", rma_size); + goto out; } atomic_inc(&ri->use_count); kvm->arch.rma = ri; @@ -1164,65 +1227,31 @@ int kvmppc_core_prepare_memory_region(struct kvm *kvm, kvm->arch.rmor = kvm->arch.rma->base_pfn << PAGE_SHIFT; } kvm->arch.lpcr = lpcr; - pr_info("Using RMO at %lx size %lx (LPCR = %lx)\n", + pr_info("KVM: Using RMO at %lx size %lx (LPCR = %lx)\n", ri->base_pfn << PAGE_SHIFT, rma_size, lpcr); - } - for (i = 0; i < npages; ++i) { - if (ri && i < ri->npages) { - phys[i] = (ri->base_pfn << PAGE_SHIFT) + (i << porder); - continue; - } - hva = mem->userspace_addr + (i << porder); - page = hva_to_page(hva); - if (!page) { - pr_err("oops, no pfn for hva %lx\n", hva); - goto err; - } - /* Check it's a 16MB page */ - if (!PageHead(page) || - compound_order(page) != (LARGE_PAGE_ORDER - PAGE_SHIFT)) { - pr_err("page at %lx isn't 16MB (o=%d)\n", - hva, compound_order(page)); - goto err; - } - phys[i] = (page_to_pfn(page) << PAGE_SHIFT) | KVMPPC_GOT_PAGE; + /* Initialize phys addrs of pages in RMO */ + porder = kvm->arch.ram_porder; + npages = rma_size >> porder; + pa = ri->base_pfn << PAGE_SHIFT; + physp = kvm->arch.slot_phys[memslot->id]; + spin_lock(&kvm->arch.slot_phys_lock); + for (i = 0; i < npages; ++i) + physp[i] = pa + (i << porder); + spin_unlock(&kvm->arch.slot_phys_lock); } - return 0; - - err: - return -EINVAL; -} - -static void unpin_slot(struct kvm *kvm, int slot_id) -{ - unsigned long *physp; - unsigned long j, npages, pfn; - struct page *page; - - physp = kvm->arch.slot_phys[slot_id]; - npages = kvm->arch.slot_npages[slot_id]; - if (physp) { - for (j = 0; j < npages; j++) { - if (!(physp[j] & KVMPPC_GOT_PAGE)) - continue; - pfn = physp[j] >> PAGE_SHIFT; - page = pfn_to_page(pfn); - SetPageDirty(page); - put_page(page); - } - vfree(physp); - kvm->arch.slot_phys[slot_id] = NULL; - } -} + /* Order updates to kvm->arch.lpcr etc. vs. rma_setup_done */ + smp_wmb(); + kvm->arch.rma_setup_done = 1; + err = 0; + out: + mutex_unlock(&kvm->lock); + return err; -void kvmppc_core_commit_memory_region(struct kvm *kvm, - struct kvm_userspace_memory_region *mem) -{ - if (mem->guest_phys_addr == 0 && mem->memory_size != 0 && - !kvm->arch.rma) - kvmppc_map_vrma(kvm, mem); + up_out: + up_read(¤t->mm->mmap_sem); + goto out; } int kvmppc_core_init_vm(struct kvm *kvm) @@ -1261,6 +1290,7 @@ int kvmppc_core_init_vm(struct kvm *kvm) } kvm->arch.lpcr = lpcr; + spin_lock_init(&kvm->arch.slot_phys_lock); return 0; } diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c index a28a6030ec9..047c5e1fd70 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include @@ -56,56 +57,54 @@ static void *real_vmalloc_addr(void *x) long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, long pte_index, unsigned long pteh, unsigned long ptel) { - unsigned long porder; struct kvm *kvm = vcpu->kvm; - unsigned long i, gfn, lpn, pa; + unsigned long i, pa, gpa, gfn, psize; + unsigned long slot_fn; unsigned long *hpte; struct revmap_entry *rev; unsigned long g_ptel = ptel; struct kvm_memory_slot *memslot; - unsigned long *physp; + unsigned long *physp, pte_size; + bool realmode = vcpu->arch.vcore->vcore_state == VCORE_RUNNING; - /* only handle 4k, 64k and 16M pages for now */ - porder = 12; - if (pteh & HPTE_V_LARGE) { - if (cpu_has_feature(CPU_FTR_ARCH_206) && - (ptel & 0xf000) == 0x1000) { - /* 64k page */ - porder = 16; - } else if ((ptel & 0xff000) == 0) { - /* 16M page */ - porder = 24; - /* lowest AVA bit must be 0 for 16M pages */ - if (pteh & 0x80) - return H_PARAMETER; - } else - return H_PARAMETER; - } - if (porder > kvm->arch.ram_porder) + psize = hpte_page_size(pteh, ptel); + if (!psize) return H_PARAMETER; - gfn = ((ptel & HPTE_R_RPN) & ~((1ul << porder) - 1)) >> PAGE_SHIFT; + /* Find the memslot (if any) for this address */ + gpa = (ptel & HPTE_R_RPN) & ~(psize - 1); + gfn = gpa >> PAGE_SHIFT; memslot = builtin_gfn_to_memslot(kvm, gfn); if (!(memslot && !(memslot->flags & KVM_MEMSLOT_INVALID))) return H_PARAMETER; + slot_fn = gfn - memslot->base_gfn; + physp = kvm->arch.slot_phys[memslot->id]; if (!physp) return H_PARAMETER; - - lpn = (gfn - memslot->base_gfn) >> (kvm->arch.ram_porder - PAGE_SHIFT); - physp = real_vmalloc_addr(physp + lpn); + physp += slot_fn; + if (realmode) + physp = real_vmalloc_addr(physp); pa = *physp; if (!pa) - return H_PARAMETER; + return H_TOO_HARD; pa &= PAGE_MASK; + pte_size = kvm->arch.ram_psize; + if (pte_size < psize) + return H_PARAMETER; + if (pa && pte_size > psize) + pa |= gpa & (pte_size - 1); + + ptel &= ~(HPTE_R_PP0 - psize); + ptel |= pa; + /* Check WIMG */ if ((ptel & HPTE_R_WIMG) != HPTE_R_M && (ptel & HPTE_R_WIMG) != (HPTE_R_W | HPTE_R_I | HPTE_R_M)) return H_PARAMETER; pteh &= ~0x60UL; - ptel &= ~(HPTE_R_PP0 - kvm->arch.ram_psize); - ptel |= pa; + pteh |= HPTE_V_VALID; if (pte_index >= HPT_NPTE) return H_PARAMETER; @@ -162,6 +161,7 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, vcpu->arch.gpr[4] = pte_index; return H_SUCCESS; } +EXPORT_SYMBOL_GPL(kvmppc_h_enter); #define LOCK_TOKEN (*(u32 *)(&get_paca()->lock_token)) -- cgit v1.2.3 From da9d1d7f2875cc8c1ffbce8f3501d0b33f4e7a4d Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Mon, 12 Dec 2011 12:31:41 +0000 Subject: KVM: PPC: Allow use of small pages to back Book3S HV guests This relaxes the requirement that the guest memory be provided as 16MB huge pages, allowing it to be provided as normal memory, i.e. in pages of PAGE_SIZE bytes (4k or 64k). To allow this, we index the kvm->arch.slot_phys[] arrays with a small page index, even if huge pages are being used, and use the low-order 5 bits of each entry to store the order of the enclosing page with respect to normal pages, i.e. log_2(enclosing_page_size / PAGE_SIZE). Signed-off-by: Paul Mackerras Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_book3s_64.h | 10 +++ arch/powerpc/include/asm/kvm_host.h | 3 +- arch/powerpc/include/asm/kvm_ppc.h | 2 +- arch/powerpc/include/asm/reg.h | 1 + arch/powerpc/kvm/book3s_64_mmu_hv.c | 122 +++++++++++++++++++++---------- arch/powerpc/kvm/book3s_hv.c | 57 ++++++++------- arch/powerpc/kvm/book3s_hv_rm_mmu.c | 6 +- 7 files changed, 132 insertions(+), 69 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h index 7e6f2ede44a..10920f7a2b8 100644 --- a/arch/powerpc/include/asm/kvm_book3s_64.h +++ b/arch/powerpc/include/asm/kvm_book3s_64.h @@ -113,4 +113,14 @@ static inline unsigned long hpte_page_size(unsigned long h, unsigned long l) return 0; /* error */ } +static inline bool slot_is_aligned(struct kvm_memory_slot *memslot, + unsigned long pagesize) +{ + unsigned long mask = (pagesize >> PAGE_SHIFT) - 1; + + if (pagesize <= PAGE_SIZE) + return 1; + return !(memslot->base_gfn & mask) && !(memslot->npages & mask); +} + #endif /* __ASM_KVM_BOOK3S_64_H__ */ diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index beb22ba71e2..9252d5e3758 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -177,14 +177,13 @@ struct revmap_entry { }; /* Low-order bits in kvm->arch.slot_phys[][] */ +#define KVMPPC_PAGE_ORDER_MASK 0x1f #define KVMPPC_GOT_PAGE 0x80 struct kvm_arch { #ifdef CONFIG_KVM_BOOK3S_64_HV unsigned long hpt_virt; struct revmap_entry *revmap; - unsigned long ram_psize; - unsigned long ram_porder; unsigned int lpid; unsigned int host_lpid; unsigned long host_lpcr; diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h index 1458c6740ea..fb70414db90 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -122,7 +122,7 @@ extern void kvmppc_free_hpt(struct kvm *kvm); extern long kvmppc_prepare_vrma(struct kvm *kvm, struct kvm_userspace_memory_region *mem); extern void kvmppc_map_vrma(struct kvm_vcpu *vcpu, - struct kvm_memory_slot *memslot); + struct kvm_memory_slot *memslot, unsigned long porder); extern int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu); extern long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm, struct kvm_create_spapr_tce *args); diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h index 7fdc2c0b7fa..64447f6c049 100644 --- a/arch/powerpc/include/asm/reg.h +++ b/arch/powerpc/include/asm/reg.h @@ -237,6 +237,7 @@ #define LPCR_ISL (1ul << (63-2)) #define LPCR_VC_SH (63-2) #define LPCR_DPFD_SH (63-11) +#define LPCR_VRMASD (0x1ful << (63-16)) #define LPCR_VRMA_L (1ul << (63-12)) #define LPCR_VRMA_LP0 (1ul << (63-15)) #define LPCR_VRMA_LP1 (1ul << (63-16)) diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index 87016ccd864..cc18f3d67a5 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -34,8 +34,6 @@ #include #include -/* Pages in the VRMA are 16MB pages */ -#define VRMA_PAGE_ORDER 24 #define VRMA_VSID 0x1ffffffUL /* 1TB VSID reserved for VRMA */ /* POWER7 has 10-bit LPIDs, PPC970 has 6-bit LPIDs */ @@ -95,17 +93,31 @@ void kvmppc_free_hpt(struct kvm *kvm) free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT); } -void kvmppc_map_vrma(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot) +/* Bits in first HPTE dword for pagesize 4k, 64k or 16M */ +static inline unsigned long hpte0_pgsize_encoding(unsigned long pgsize) +{ + return (pgsize > 0x1000) ? HPTE_V_LARGE : 0; +} + +/* Bits in second HPTE dword for pagesize 4k, 64k or 16M */ +static inline unsigned long hpte1_pgsize_encoding(unsigned long pgsize) +{ + return (pgsize == 0x10000) ? 0x1000 : 0; +} + +void kvmppc_map_vrma(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot, + unsigned long porder) { - struct kvm *kvm = vcpu->kvm; unsigned long i; unsigned long npages; unsigned long hp_v, hp_r; unsigned long addr, hash; - unsigned long porder = kvm->arch.ram_porder; + unsigned long psize; + unsigned long hp0, hp1; long ret; - npages = kvm->arch.slot_npages[memslot->id]; + psize = 1ul << porder; + npages = memslot->npages >> (porder - PAGE_SHIFT); /* VRMA can't be > 1TB */ if (npages > 1ul << (40 - porder)) @@ -114,6 +126,11 @@ void kvmppc_map_vrma(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot) if (npages > HPT_NPTEG) npages = HPT_NPTEG; + hp0 = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) | + HPTE_V_BOLTED | hpte0_pgsize_encoding(psize); + hp1 = hpte1_pgsize_encoding(psize) | + HPTE_R_R | HPTE_R_C | HPTE_R_M | PP_RWXX; + for (i = 0; i < npages; ++i) { addr = i << porder; /* can't use hpt_hash since va > 64 bits */ @@ -125,10 +142,8 @@ void kvmppc_map_vrma(struct kvm_vcpu *vcpu, struct kvm_memory_slot *memslot) * is available and use it. */ hash = (hash << 3) + 7; - hp_v = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) | - (i << (VRMA_PAGE_ORDER - 16)) | HPTE_V_BOLTED | - HPTE_V_LARGE | HPTE_V_VALID; - hp_r = addr | HPTE_R_R | HPTE_R_C | HPTE_R_M | PP_RWXX; + hp_v = hp0 | ((addr >> 16) & ~0x7fUL); + hp_r = hp1 | addr; ret = kvmppc_virtmode_h_enter(vcpu, H_EXACT, hash, hp_v, hp_r); if (ret != H_SUCCESS) { pr_err("KVM: map_vrma at %lx failed, ret=%ld\n", @@ -176,22 +191,25 @@ static void kvmppc_mmu_book3s_64_hv_reset_msr(struct kvm_vcpu *vcpu) * one already in the kvm->arch.slot_phys[][] arrays. */ static long kvmppc_get_guest_page(struct kvm *kvm, unsigned long gfn, - struct kvm_memory_slot *memslot) + struct kvm_memory_slot *memslot, + unsigned long psize) { unsigned long start; - long np; - struct page *page, *pages[1]; + long np, err; + struct page *page, *hpage, *pages[1]; + unsigned long s, pgsize; unsigned long *physp; - unsigned long pfn, i; + unsigned int got, pgorder; + unsigned long pfn, i, npages; physp = kvm->arch.slot_phys[memslot->id]; if (!physp) return -EINVAL; - i = (gfn - memslot->base_gfn) >> (kvm->arch.ram_porder - PAGE_SHIFT); - if (physp[i]) + if (physp[gfn - memslot->base_gfn]) return 0; page = NULL; + pgsize = psize; start = gfn_to_hva_memslot(memslot, gfn); /* Instantiate and get the page we want access to */ @@ -199,25 +217,46 @@ static long kvmppc_get_guest_page(struct kvm *kvm, unsigned long gfn, if (np != 1) return -EINVAL; page = pages[0]; - - /* Check it's a 16MB page */ - if (!PageHead(page) || - compound_order(page) != (kvm->arch.ram_porder - PAGE_SHIFT)) { - pr_err("page at %lx isn't 16MB (o=%d)\n", - start, compound_order(page)); - put_page(page); - return -EINVAL; + got = KVMPPC_GOT_PAGE; + + /* See if this is a large page */ + s = PAGE_SIZE; + if (PageHuge(page)) { + hpage = compound_head(page); + s <<= compound_order(hpage); + /* Get the whole large page if slot alignment is ok */ + if (s > psize && slot_is_aligned(memslot, s) && + !(memslot->userspace_addr & (s - 1))) { + start &= ~(s - 1); + pgsize = s; + page = hpage; + } } + err = -EINVAL; + if (s < psize) + goto out; pfn = page_to_pfn(page); + npages = pgsize >> PAGE_SHIFT; + pgorder = __ilog2(npages); + physp += (gfn - memslot->base_gfn) & ~(npages - 1); spin_lock(&kvm->arch.slot_phys_lock); - if (!physp[i]) - physp[i] = (pfn << PAGE_SHIFT) | KVMPPC_GOT_PAGE; - else - put_page(page); + for (i = 0; i < npages; ++i) { + if (!physp[i]) { + physp[i] = ((pfn + i) << PAGE_SHIFT) + got + pgorder; + got = 0; + } + } spin_unlock(&kvm->arch.slot_phys_lock); + err = 0; - return 0; + out: + if (got) { + if (PageHuge(page)) + page = compound_head(page); + put_page(page); + } + return err; } /* @@ -242,7 +281,9 @@ long kvmppc_virtmode_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, memslot = gfn_to_memslot(kvm, gfn); if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) return H_PARAMETER; - if (kvmppc_get_guest_page(kvm, gfn, memslot) < 0) + if (!slot_is_aligned(memslot, psize)) + return H_PARAMETER; + if (kvmppc_get_guest_page(kvm, gfn, memslot, psize) < 0) return H_PARAMETER; preempt_disable(); @@ -269,8 +310,8 @@ void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa, struct kvm_memory_slot *memslot; unsigned long gfn = gpa >> PAGE_SHIFT; struct page *page; - unsigned long offset; - unsigned long pfn, pa; + unsigned long psize, offset; + unsigned long pa; unsigned long *physp; memslot = gfn_to_memslot(kvm, gfn); @@ -279,20 +320,23 @@ void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa, physp = kvm->arch.slot_phys[memslot->id]; if (!physp) return NULL; - physp += (gfn - memslot->base_gfn) >> - (kvm->arch.ram_porder - PAGE_SHIFT); + physp += gfn - memslot->base_gfn; pa = *physp; if (!pa) { - if (kvmppc_get_guest_page(kvm, gfn, memslot) < 0) + if (kvmppc_get_guest_page(kvm, gfn, memslot, PAGE_SIZE) < 0) return NULL; pa = *physp; } - pfn = pa >> PAGE_SHIFT; - page = pfn_to_page(pfn); + page = pfn_to_page(pa >> PAGE_SHIFT); + psize = PAGE_SIZE; + if (PageHuge(page)) { + page = compound_head(page); + psize <<= compound_order(page); + } get_page(page); - offset = gpa & (kvm->arch.ram_psize - 1); + offset = gpa & (psize - 1); if (nb_ret) - *nb_ret = kvm->arch.ram_psize - offset; + *nb_ret = psize - offset; return page_address(page) + offset; } diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index ce5a13fb974..6ed0a84ef91 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -51,8 +51,6 @@ #include #include -#define LARGE_PAGE_ORDER 24 /* 16MB pages */ - /* #define EXIT_DEBUG */ /* #define EXIT_DEBUG_SIMPLE */ /* #define EXIT_DEBUG_INT */ @@ -1074,24 +1072,26 @@ long kvm_vm_ioctl_allocate_rma(struct kvm *kvm, struct kvm_allocate_rma *ret) return fd; } +static unsigned long slb_pgsize_encoding(unsigned long psize) +{ + unsigned long senc = 0; + + if (psize > 0x1000) { + senc = SLB_VSID_L; + if (psize == 0x10000) + senc |= SLB_VSID_LP_01; + } + return senc; +} + int kvmppc_core_prepare_memory_region(struct kvm *kvm, struct kvm_userspace_memory_region *mem) { - unsigned long psize; unsigned long npages; unsigned long *phys; - /* For now, only allow 16MB-aligned slots */ - psize = kvm->arch.ram_psize; - if ((mem->memory_size & (psize - 1)) || - (mem->guest_phys_addr & (psize - 1))) { - pr_err("bad memory_size=%llx @ %llx\n", - mem->memory_size, mem->guest_phys_addr); - return -EINVAL; - } - /* Allocate a slot_phys array */ - npages = mem->memory_size >> kvm->arch.ram_porder; + npages = mem->memory_size >> PAGE_SHIFT; phys = kvm->arch.slot_phys[mem->slot]; if (!phys) { phys = vzalloc(npages * sizeof(unsigned long)); @@ -1119,6 +1119,8 @@ static void unpin_slot(struct kvm *kvm, int slot_id) continue; pfn = physp[j] >> PAGE_SHIFT; page = pfn_to_page(pfn); + if (PageHuge(page)) + page = compound_head(page); SetPageDirty(page); put_page(page); } @@ -1141,12 +1143,12 @@ static int kvmppc_hv_setup_rma(struct kvm_vcpu *vcpu) unsigned long hva; struct kvm_memory_slot *memslot; struct vm_area_struct *vma; - unsigned long lpcr; + unsigned long lpcr, senc; unsigned long psize, porder; unsigned long rma_size; unsigned long rmls; unsigned long *physp; - unsigned long i, npages, pa; + unsigned long i, npages; mutex_lock(&kvm->lock); if (kvm->arch.rma_setup_done) @@ -1168,8 +1170,7 @@ static int kvmppc_hv_setup_rma(struct kvm_vcpu *vcpu) goto up_out; psize = vma_kernel_pagesize(vma); - if (psize != kvm->arch.ram_psize) - goto up_out; + porder = __ilog2(psize); /* Is this one of our preallocated RMAs? */ if (vma->vm_file && vma->vm_file->f_op == &kvm_rma_fops && @@ -1186,13 +1187,20 @@ static int kvmppc_hv_setup_rma(struct kvm_vcpu *vcpu) goto out; } + /* We can handle 4k, 64k or 16M pages in the VRMA */ + err = -EINVAL; + if (!(psize == 0x1000 || psize == 0x10000 || + psize == 0x1000000)) + goto out; + /* Update VRMASD field in the LPCR */ - lpcr = kvm->arch.lpcr & ~(0x1fUL << LPCR_VRMASD_SH); - lpcr |= LPCR_VRMA_L; + senc = slb_pgsize_encoding(psize); + lpcr = kvm->arch.lpcr & ~LPCR_VRMASD; + lpcr |= senc << (LPCR_VRMASD_SH - 4); kvm->arch.lpcr = lpcr; /* Create HPTEs in the hash page table for the VRMA */ - kvmppc_map_vrma(vcpu, memslot); + kvmppc_map_vrma(vcpu, memslot, porder); } else { /* Set up to use an RMO region */ @@ -1231,13 +1239,12 @@ static int kvmppc_hv_setup_rma(struct kvm_vcpu *vcpu) ri->base_pfn << PAGE_SHIFT, rma_size, lpcr); /* Initialize phys addrs of pages in RMO */ - porder = kvm->arch.ram_porder; - npages = rma_size >> porder; - pa = ri->base_pfn << PAGE_SHIFT; + npages = ri->npages; + porder = __ilog2(npages); physp = kvm->arch.slot_phys[memslot->id]; spin_lock(&kvm->arch.slot_phys_lock); for (i = 0; i < npages; ++i) - physp[i] = pa + (i << porder); + physp[i] = ((ri->base_pfn + i) << PAGE_SHIFT) + porder; spin_unlock(&kvm->arch.slot_phys_lock); } @@ -1266,8 +1273,6 @@ int kvmppc_core_init_vm(struct kvm *kvm) INIT_LIST_HEAD(&kvm->arch.spapr_tce_tables); - kvm->arch.ram_psize = 1ul << LARGE_PAGE_ORDER; - kvm->arch.ram_porder = LARGE_PAGE_ORDER; kvm->arch.rma = NULL; kvm->arch.host_sdr1 = mfspr(SPRN_SDR1); diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c index 047c5e1fd70..c086eb0fa99 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c @@ -77,6 +77,10 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, memslot = builtin_gfn_to_memslot(kvm, gfn); if (!(memslot && !(memslot->flags & KVM_MEMSLOT_INVALID))) return H_PARAMETER; + + /* Check if the requested page fits entirely in the memslot. */ + if (!slot_is_aligned(memslot, psize)) + return H_PARAMETER; slot_fn = gfn - memslot->base_gfn; physp = kvm->arch.slot_phys[memslot->id]; @@ -88,9 +92,9 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, pa = *physp; if (!pa) return H_TOO_HARD; + pte_size = PAGE_SIZE << (pa & KVMPPC_PAGE_ORDER_MASK); pa &= PAGE_MASK; - pte_size = kvm->arch.ram_psize; if (pte_size < psize) return H_PARAMETER; if (pa && pte_size > psize) -- cgit v1.2.3 From 9d0ef5ea043d1242897d15c71bd1a15da79b4a5d Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Mon, 12 Dec 2011 12:32:27 +0000 Subject: KVM: PPC: Allow I/O mappings in memory slots This provides for the case where userspace maps an I/O device into the address range of a memory slot using a VM_PFNMAP mapping. In that case, we work out the pfn from vma->vm_pgoff, and record the cache enable bits from vma->vm_page_prot in two low-order bits in the slot_phys array entries. Then, in kvmppc_h_enter() we check that the cache bits in the HPTE that the guest wants to insert match the cache bits in the slot_phys array entry. However, we do allow the guest to create what it thinks is a non-cacheable or write-through mapping to memory that is actually cacheable, so that we can use normal system memory as part of an emulated device later on. In that case the actual HPTE we insert is a cacheable HPTE. Signed-off-by: Paul Mackerras Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_book3s_64.h | 26 +++++++++++++ arch/powerpc/include/asm/kvm_host.h | 2 + arch/powerpc/kvm/book3s_64_mmu_hv.c | 65 +++++++++++++++++++++----------- arch/powerpc/kvm/book3s_hv_rm_mmu.c | 15 ++++++-- 4 files changed, 84 insertions(+), 24 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h index 10920f7a2b8..18b590d261f 100644 --- a/arch/powerpc/include/asm/kvm_book3s_64.h +++ b/arch/powerpc/include/asm/kvm_book3s_64.h @@ -113,6 +113,32 @@ static inline unsigned long hpte_page_size(unsigned long h, unsigned long l) return 0; /* error */ } +static inline int hpte_cache_flags_ok(unsigned long ptel, unsigned long io_type) +{ + unsigned int wimg = ptel & HPTE_R_WIMG; + + /* Handle SAO */ + if (wimg == (HPTE_R_W | HPTE_R_I | HPTE_R_M) && + cpu_has_feature(CPU_FTR_ARCH_206)) + wimg = HPTE_R_M; + + if (!io_type) + return wimg == HPTE_R_M; + + return (wimg & (HPTE_R_W | HPTE_R_I)) == io_type; +} + +/* Return HPTE cache control bits corresponding to Linux pte bits */ +static inline unsigned long hpte_cache_bits(unsigned long pte_val) +{ +#if _PAGE_NO_CACHE == HPTE_R_I && _PAGE_WRITETHRU == HPTE_R_W + return pte_val & (HPTE_R_W | HPTE_R_I); +#else + return ((pte_val & _PAGE_NO_CACHE) ? HPTE_R_I : 0) + + ((pte_val & _PAGE_WRITETHRU) ? HPTE_R_W : 0); +#endif +} + static inline bool slot_is_aligned(struct kvm_memory_slot *memslot, unsigned long pagesize) { diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 9252d5e3758..243bc803857 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -178,6 +178,8 @@ struct revmap_entry { /* Low-order bits in kvm->arch.slot_phys[][] */ #define KVMPPC_PAGE_ORDER_MASK 0x1f +#define KVMPPC_PAGE_NO_CACHE HPTE_R_I /* 0x20 */ +#define KVMPPC_PAGE_WRITETHRU HPTE_R_W /* 0x40 */ #define KVMPPC_GOT_PAGE 0x80 struct kvm_arch { diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index cc18f3d67a5..b904c40a17b 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -199,7 +199,8 @@ static long kvmppc_get_guest_page(struct kvm *kvm, unsigned long gfn, struct page *page, *hpage, *pages[1]; unsigned long s, pgsize; unsigned long *physp; - unsigned int got, pgorder; + unsigned int is_io, got, pgorder; + struct vm_area_struct *vma; unsigned long pfn, i, npages; physp = kvm->arch.slot_phys[memslot->id]; @@ -208,34 +209,51 @@ static long kvmppc_get_guest_page(struct kvm *kvm, unsigned long gfn, if (physp[gfn - memslot->base_gfn]) return 0; + is_io = 0; + got = 0; page = NULL; pgsize = psize; + err = -EINVAL; start = gfn_to_hva_memslot(memslot, gfn); /* Instantiate and get the page we want access to */ np = get_user_pages_fast(start, 1, 1, pages); - if (np != 1) - return -EINVAL; - page = pages[0]; - got = KVMPPC_GOT_PAGE; + if (np != 1) { + /* Look up the vma for the page */ + down_read(¤t->mm->mmap_sem); + vma = find_vma(current->mm, start); + if (!vma || vma->vm_start > start || + start + psize > vma->vm_end || + !(vma->vm_flags & VM_PFNMAP)) + goto up_err; + is_io = hpte_cache_bits(pgprot_val(vma->vm_page_prot)); + pfn = vma->vm_pgoff + ((start - vma->vm_start) >> PAGE_SHIFT); + /* check alignment of pfn vs. requested page size */ + if (psize > PAGE_SIZE && (pfn & ((psize >> PAGE_SHIFT) - 1))) + goto up_err; + up_read(¤t->mm->mmap_sem); - /* See if this is a large page */ - s = PAGE_SIZE; - if (PageHuge(page)) { - hpage = compound_head(page); - s <<= compound_order(hpage); - /* Get the whole large page if slot alignment is ok */ - if (s > psize && slot_is_aligned(memslot, s) && - !(memslot->userspace_addr & (s - 1))) { - start &= ~(s - 1); - pgsize = s; - page = hpage; + } else { + page = pages[0]; + got = KVMPPC_GOT_PAGE; + + /* See if this is a large page */ + s = PAGE_SIZE; + if (PageHuge(page)) { + hpage = compound_head(page); + s <<= compound_order(hpage); + /* Get the whole large page if slot alignment is ok */ + if (s > psize && slot_is_aligned(memslot, s) && + !(memslot->userspace_addr & (s - 1))) { + start &= ~(s - 1); + pgsize = s; + page = hpage; + } } + if (s < psize) + goto out; + pfn = page_to_pfn(page); } - err = -EINVAL; - if (s < psize) - goto out; - pfn = page_to_pfn(page); npages = pgsize >> PAGE_SHIFT; pgorder = __ilog2(npages); @@ -243,7 +261,8 @@ static long kvmppc_get_guest_page(struct kvm *kvm, unsigned long gfn, spin_lock(&kvm->arch.slot_phys_lock); for (i = 0; i < npages; ++i) { if (!physp[i]) { - physp[i] = ((pfn + i) << PAGE_SHIFT) + got + pgorder; + physp[i] = ((pfn + i) << PAGE_SHIFT) + + got + is_io + pgorder; got = 0; } } @@ -257,6 +276,10 @@ static long kvmppc_get_guest_page(struct kvm *kvm, unsigned long gfn, put_page(page); } return err; + + up_err: + up_read(¤t->mm->mmap_sem); + return err; } /* diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c index c086eb0fa99..3f5b016490d 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c @@ -65,6 +65,7 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, unsigned long g_ptel = ptel; struct kvm_memory_slot *memslot; unsigned long *physp, pte_size; + unsigned long is_io; bool realmode = vcpu->arch.vcore->vcore_state == VCORE_RUNNING; psize = hpte_page_size(pteh, ptel); @@ -92,6 +93,7 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, pa = *physp; if (!pa) return H_TOO_HARD; + is_io = pa & (HPTE_R_I | HPTE_R_W); pte_size = PAGE_SIZE << (pa & KVMPPC_PAGE_ORDER_MASK); pa &= PAGE_MASK; @@ -104,9 +106,16 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, ptel |= pa; /* Check WIMG */ - if ((ptel & HPTE_R_WIMG) != HPTE_R_M && - (ptel & HPTE_R_WIMG) != (HPTE_R_W | HPTE_R_I | HPTE_R_M)) - return H_PARAMETER; + if (!hpte_cache_flags_ok(ptel, is_io)) { + if (is_io) + return H_PARAMETER; + /* + * Allow guest to map emulated device memory as + * uncacheable, but actually make it cacheable. + */ + ptel &= ~(HPTE_R_W|HPTE_R_I|HPTE_R_G); + ptel |= HPTE_R_M; + } pteh &= ~0x60UL; pteh |= HPTE_V_VALID; -- cgit v1.2.3 From 06ce2c63d933e347f8a199f123a8a293619ab3d2 Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Mon, 12 Dec 2011 12:33:07 +0000 Subject: KVM: PPC: Maintain a doubly-linked list of guest HPTEs for each gfn This expands the reverse mapping array to contain two links for each HPTE which are used to link together HPTEs that correspond to the same guest logical page. Each circular list of HPTEs is pointed to by the rmap array entry for the guest logical page, pointed to by the relevant memslot. Links are 32-bit HPT entry indexes rather than full 64-bit pointers, to save space. We use 3 of the remaining 32 bits in the rmap array entries as a lock bit, a referenced bit and a present bit (the present bit is needed since HPTE index 0 is valid). The bit lock for the rmap chain nests inside the HPTE lock bit. Signed-off-by: Paul Mackerras Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_book3s_64.h | 18 +++++++ arch/powerpc/include/asm/kvm_host.h | 17 ++++++- arch/powerpc/kvm/book3s_hv_rm_mmu.c | 84 +++++++++++++++++++++++++++++++- 3 files changed, 117 insertions(+), 2 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h index 18b590d261f..9508c03e667 100644 --- a/arch/powerpc/include/asm/kvm_book3s_64.h +++ b/arch/powerpc/include/asm/kvm_book3s_64.h @@ -113,6 +113,11 @@ static inline unsigned long hpte_page_size(unsigned long h, unsigned long l) return 0; /* error */ } +static inline unsigned long hpte_rpn(unsigned long ptel, unsigned long psize) +{ + return ((ptel & HPTE_R_RPN) & ~(psize - 1)) >> PAGE_SHIFT; +} + static inline int hpte_cache_flags_ok(unsigned long ptel, unsigned long io_type) { unsigned int wimg = ptel & HPTE_R_WIMG; @@ -139,6 +144,19 @@ static inline unsigned long hpte_cache_bits(unsigned long pte_val) #endif } +static inline void lock_rmap(unsigned long *rmap) +{ + do { + while (test_bit(KVMPPC_RMAP_LOCK_BIT, rmap)) + cpu_relax(); + } while (test_and_set_bit_lock(KVMPPC_RMAP_LOCK_BIT, rmap)); +} + +static inline void unlock_rmap(unsigned long *rmap) +{ + __clear_bit_unlock(KVMPPC_RMAP_LOCK_BIT, rmap); +} + static inline bool slot_is_aligned(struct kvm_memory_slot *memslot, unsigned long pagesize) { diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 243bc803857..97cb2d7865f 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -170,12 +170,27 @@ struct kvmppc_rma_info { /* * The reverse mapping array has one entry for each HPTE, * which stores the guest's view of the second word of the HPTE - * (including the guest physical address of the mapping). + * (including the guest physical address of the mapping), + * plus forward and backward pointers in a doubly-linked ring + * of HPTEs that map the same host page. The pointers in this + * ring are 32-bit HPTE indexes, to save space. */ struct revmap_entry { unsigned long guest_rpte; + unsigned int forw, back; }; +/* + * We use the top bit of each memslot->rmap entry as a lock bit, + * and bit 32 as a present flag. The bottom 32 bits are the + * index in the guest HPT of a HPTE that points to the page. + */ +#define KVMPPC_RMAP_LOCK_BIT 63 +#define KVMPPC_RMAP_REF_BIT 33 +#define KVMPPC_RMAP_REFERENCED (1ul << KVMPPC_RMAP_REF_BIT) +#define KVMPPC_RMAP_PRESENT 0x100000000ul +#define KVMPPC_RMAP_INDEX 0xfffffffful + /* Low-order bits in kvm->arch.slot_phys[][] */ #define KVMPPC_PAGE_ORDER_MASK 0x1f #define KVMPPC_PAGE_NO_CACHE HPTE_R_I /* 0x20 */ diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c index 3f5b016490d..5b31caa4b31 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c @@ -54,6 +54,70 @@ static void *real_vmalloc_addr(void *x) return __va(addr); } +/* + * Add this HPTE into the chain for the real page. + * Must be called with the chain locked; it unlocks the chain. + */ +static void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev, + unsigned long *rmap, long pte_index, int realmode) +{ + struct revmap_entry *head, *tail; + unsigned long i; + + if (*rmap & KVMPPC_RMAP_PRESENT) { + i = *rmap & KVMPPC_RMAP_INDEX; + head = &kvm->arch.revmap[i]; + if (realmode) + head = real_vmalloc_addr(head); + tail = &kvm->arch.revmap[head->back]; + if (realmode) + tail = real_vmalloc_addr(tail); + rev->forw = i; + rev->back = head->back; + tail->forw = pte_index; + head->back = pte_index; + } else { + rev->forw = rev->back = pte_index; + i = pte_index; + } + smp_wmb(); + *rmap = i | KVMPPC_RMAP_REFERENCED | KVMPPC_RMAP_PRESENT; /* unlock */ +} + +/* Remove this HPTE from the chain for a real page */ +static void remove_revmap_chain(struct kvm *kvm, long pte_index, + unsigned long hpte_v) +{ + struct revmap_entry *rev, *next, *prev; + unsigned long gfn, ptel, head; + struct kvm_memory_slot *memslot; + unsigned long *rmap; + + rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); + ptel = rev->guest_rpte; + gfn = hpte_rpn(ptel, hpte_page_size(hpte_v, ptel)); + memslot = builtin_gfn_to_memslot(kvm, gfn); + if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) + return; + + rmap = real_vmalloc_addr(&memslot->rmap[gfn - memslot->base_gfn]); + lock_rmap(rmap); + + head = *rmap & KVMPPC_RMAP_INDEX; + next = real_vmalloc_addr(&kvm->arch.revmap[rev->forw]); + prev = real_vmalloc_addr(&kvm->arch.revmap[rev->back]); + next->back = rev->back; + prev->forw = rev->forw; + if (head == pte_index) { + head = rev->forw; + if (head == pte_index) + *rmap &= ~(KVMPPC_RMAP_PRESENT | KVMPPC_RMAP_INDEX); + else + *rmap = (*rmap & ~KVMPPC_RMAP_INDEX) | head; + } + unlock_rmap(rmap); +} + long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, long pte_index, unsigned long pteh, unsigned long ptel) { @@ -66,6 +130,7 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, struct kvm_memory_slot *memslot; unsigned long *physp, pte_size; unsigned long is_io; + unsigned long *rmap; bool realmode = vcpu->arch.vcore->vcore_state == VCORE_RUNNING; psize = hpte_page_size(pteh, ptel); @@ -83,6 +148,7 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, if (!slot_is_aligned(memslot, psize)) return H_PARAMETER; slot_fn = gfn - memslot->base_gfn; + rmap = &memslot->rmap[slot_fn]; physp = kvm->arch.slot_phys[memslot->id]; if (!physp) @@ -164,13 +230,25 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, } /* Save away the guest's idea of the second HPTE dword */ - rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); + rev = &kvm->arch.revmap[pte_index]; + if (realmode) + rev = real_vmalloc_addr(rev); if (rev) rev->guest_rpte = g_ptel; + + /* Link HPTE into reverse-map chain */ + if (realmode) + rmap = real_vmalloc_addr(rmap); + lock_rmap(rmap); + kvmppc_add_revmap_chain(kvm, rev, rmap, pte_index, realmode); + hpte[1] = ptel; + + /* Write the first HPTE dword, unlocking the HPTE and making it valid */ eieio(); hpte[0] = pteh; asm volatile("ptesync" : : : "memory"); + vcpu->arch.gpr[4] = pte_index; return H_SUCCESS; } @@ -220,6 +298,8 @@ long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags, vcpu->arch.gpr[4] = v = hpte[0] & ~HPTE_V_HVLOCK; vcpu->arch.gpr[5] = r = hpte[1]; rb = compute_tlbie_rb(v, r, pte_index); + remove_revmap_chain(kvm, pte_index, v); + smp_wmb(); hpte[0] = 0; if (!(flags & H_LOCAL)) { while(!try_lock_tlbie(&kvm->arch.tlbie_lock)) @@ -293,6 +373,8 @@ long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu) flags |= (hp[1] >> 5) & 0x0c; args[i * 2] = ((0x80 | flags) << 56) + pte_index; tlbrb[n_inval++] = compute_tlbie_rb(hp[0], hp[1], pte_index); + remove_revmap_chain(kvm, pte_index, hp[0]); + smp_wmb(); hp[0] = 0; } if (n_inval == 0) -- cgit v1.2.3 From 697d3899dcb4bcd918d060a92db57b794e56b077 Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Mon, 12 Dec 2011 12:36:37 +0000 Subject: KVM: PPC: Implement MMIO emulation support for Book3S HV guests This provides the low-level support for MMIO emulation in Book3S HV guests. When the guest tries to map a page which is not covered by any memslot, that page is taken to be an MMIO emulation page. Instead of inserting a valid HPTE, we insert an HPTE that has the valid bit clear but another hypervisor software-use bit set, which we call HPTE_V_ABSENT, to indicate that this is an absent page. An absent page is treated much like a valid page as far as guest hcalls (H_ENTER, H_REMOVE, H_READ etc.) are concerned, except of course that an absent HPTE doesn't need to be invalidated with tlbie since it was never valid as far as the hardware is concerned. When the guest accesses a page for which there is an absent HPTE, it will take a hypervisor data storage interrupt (HDSI) since we now set the VPM1 bit in the LPCR. Our HDSI handler for HPTE-not-present faults looks up the hash table and if it finds an absent HPTE mapping the requested virtual address, will switch to kernel mode and handle the fault in kvmppc_book3s_hv_page_fault(), which at present just calls kvmppc_hv_emulate_mmio() to set up the MMIO emulation. This is based on an earlier patch by Benjamin Herrenschmidt, but since heavily reworked. Signed-off-by: Paul Mackerras Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_book3s.h | 5 + arch/powerpc/include/asm/kvm_book3s_64.h | 26 +++ arch/powerpc/include/asm/kvm_host.h | 5 + arch/powerpc/include/asm/mmu-hash64.h | 2 +- arch/powerpc/include/asm/ppc-opcode.h | 4 +- arch/powerpc/include/asm/reg.h | 1 + arch/powerpc/kernel/asm-offsets.c | 1 + arch/powerpc/kernel/exceptions-64s.S | 8 +- arch/powerpc/kvm/book3s_64_mmu_hv.c | 228 +++++++++++++++++++++++++-- arch/powerpc/kvm/book3s_hv.c | 21 +-- arch/powerpc/kvm/book3s_hv_rm_mmu.c | 262 ++++++++++++++++++++++++++----- arch/powerpc/kvm/book3s_hv_rmhandlers.S | 127 ++++++++++++--- 12 files changed, 607 insertions(+), 83 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h index c700f43ba17..3a9e51f4339 100644 --- a/arch/powerpc/include/asm/kvm_book3s.h +++ b/arch/powerpc/include/asm/kvm_book3s.h @@ -119,6 +119,11 @@ extern void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu); extern int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte); extern int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr); extern void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu); +extern int kvmppc_book3s_hv_page_fault(struct kvm_run *run, + struct kvm_vcpu *vcpu, unsigned long addr, + unsigned long status); +extern long kvmppc_hv_find_lock_hpte(struct kvm *kvm, gva_t eaddr, + unsigned long slb_v, unsigned long valid); extern void kvmppc_mmu_hpte_cache_map(struct kvm_vcpu *vcpu, struct hpte_cache *pte); extern struct hpte_cache *kvmppc_mmu_hpte_cache_next(struct kvm_vcpu *vcpu); diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h index 9508c03e667..79dc37fb86b 100644 --- a/arch/powerpc/include/asm/kvm_book3s_64.h +++ b/arch/powerpc/include/asm/kvm_book3s_64.h @@ -43,12 +43,15 @@ static inline void svcpu_put(struct kvmppc_book3s_shadow_vcpu *svcpu) #define HPT_HASH_MASK (HPT_NPTEG - 1) #endif +#define VRMA_VSID 0x1ffffffUL /* 1TB VSID reserved for VRMA */ + /* * We use a lock bit in HPTE dword 0 to synchronize updates and * accesses to each HPTE, and another bit to indicate non-present * HPTEs. */ #define HPTE_V_HVLOCK 0x40UL +#define HPTE_V_ABSENT 0x20UL static inline long try_lock_hpte(unsigned long *hpte, unsigned long bits) { @@ -144,6 +147,29 @@ static inline unsigned long hpte_cache_bits(unsigned long pte_val) #endif } +static inline bool hpte_read_permission(unsigned long pp, unsigned long key) +{ + if (key) + return PP_RWRX <= pp && pp <= PP_RXRX; + return 1; +} + +static inline bool hpte_write_permission(unsigned long pp, unsigned long key) +{ + if (key) + return pp == PP_RWRW; + return pp <= PP_RWRW; +} + +static inline int hpte_get_skey_perm(unsigned long hpte_r, unsigned long amr) +{ + unsigned long skey; + + skey = ((hpte_r & HPTE_R_KEY_HI) >> 57) | + ((hpte_r & HPTE_R_KEY_LO) >> 9); + return (amr >> (62 - 2 * skey)) & 3; +} + static inline void lock_rmap(unsigned long *rmap) { do { diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 97cb2d7865f..937cacaaf23 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -210,6 +210,7 @@ struct kvm_arch { unsigned long lpcr; unsigned long rmor; struct kvmppc_rma_info *rma; + unsigned long vrma_slb_v; int rma_setup_done; struct list_head spapr_tce_tables; spinlock_t slot_phys_lock; @@ -452,6 +453,10 @@ struct kvm_vcpu_arch { #ifdef CONFIG_KVM_BOOK3S_64_HV struct kvm_vcpu_arch_shared shregs; + unsigned long pgfault_addr; + long pgfault_index; + unsigned long pgfault_hpte[2]; + struct list_head run_list; struct task_struct *run_task; struct kvm_run *kvm_run; diff --git a/arch/powerpc/include/asm/mmu-hash64.h b/arch/powerpc/include/asm/mmu-hash64.h index 412ba493cb9..0759dd8bf5a 100644 --- a/arch/powerpc/include/asm/mmu-hash64.h +++ b/arch/powerpc/include/asm/mmu-hash64.h @@ -108,11 +108,11 @@ extern char initial_stab[]; #define HPTE_V_VRMA_MASK ASM_CONST(0x4001ffffff000000) /* Values for PP (assumes Ks=0, Kp=1) */ -/* pp0 will always be 0 for linux */ #define PP_RWXX 0 /* Supervisor read/write, User none */ #define PP_RWRX 1 /* Supervisor read/write, User read */ #define PP_RWRW 2 /* Supervisor read/write, User read/write */ #define PP_RXRX 3 /* Supervisor read, User read */ +#define PP_RXXX (HPTE_R_PP0 | 2) /* Supervisor read, user none */ #ifndef __ASSEMBLY__ diff --git a/arch/powerpc/include/asm/ppc-opcode.h b/arch/powerpc/include/asm/ppc-opcode.h index e980faae422..d81f99430fe 100644 --- a/arch/powerpc/include/asm/ppc-opcode.h +++ b/arch/powerpc/include/asm/ppc-opcode.h @@ -45,6 +45,7 @@ #define PPC_INST_MFSPR_DSCR_MASK 0xfc1fffff #define PPC_INST_MTSPR_DSCR 0x7c1103a6 #define PPC_INST_MTSPR_DSCR_MASK 0xfc1fffff +#define PPC_INST_SLBFEE 0x7c0007a7 #define PPC_INST_STRING 0x7c00042a #define PPC_INST_STRING_MASK 0xfc0007fe @@ -183,7 +184,8 @@ __PPC_RS(t) | __PPC_RA(a) | __PPC_RB(b)) #define PPC_ERATSX_DOT(t, a, w) stringify_in_c(.long PPC_INST_ERATSX_DOT | \ __PPC_RS(t) | __PPC_RA(a) | __PPC_RB(b)) - +#define PPC_SLBFEE_DOT(t, b) stringify_in_c(.long PPC_INST_SLBFEE | \ + __PPC_RT(t) | __PPC_RB(b)) /* * Define what the VSX XX1 form instructions will look like, then add diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h index 64447f6c049..16efb3151c2 100644 --- a/arch/powerpc/include/asm/reg.h +++ b/arch/powerpc/include/asm/reg.h @@ -216,6 +216,7 @@ #define DSISR_ISSTORE 0x02000000 /* access was a store */ #define DSISR_DABRMATCH 0x00400000 /* hit data breakpoint */ #define DSISR_NOSEGMENT 0x00200000 /* STAB/SLB miss */ +#define DSISR_KEYFAULT 0x00200000 /* Key fault */ #define SPRN_TBRL 0x10C /* Time Base Read Lower Register (user, R/O) */ #define SPRN_TBRU 0x10D /* Time Base Read Upper Register (user, R/O) */ #define SPRN_TBWL 0x11C /* Time Base Lower Register (super, R/W) */ diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index e7bfcf81b74..8e0db0b12dd 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/arch/powerpc/kernel/asm-offsets.c @@ -455,6 +455,7 @@ int main(void) DEFINE(KVM_LAST_VCPU, offsetof(struct kvm, arch.last_vcpu)); DEFINE(KVM_LPCR, offsetof(struct kvm, arch.lpcr)); DEFINE(KVM_RMOR, offsetof(struct kvm, arch.rmor)); + DEFINE(KVM_VRMA_SLB_V, offsetof(struct kvm, arch.vrma_slb_v)); DEFINE(VCPU_DSISR, offsetof(struct kvm_vcpu, arch.shregs.dsisr)); DEFINE(VCPU_DAR, offsetof(struct kvm_vcpu, arch.shregs.dar)); #endif diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 15c5a4f6de0..8bea12086b6 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -100,14 +100,14 @@ data_access_not_stab: END_MMU_FTR_SECTION_IFCLR(MMU_FTR_SLB) #endif EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common, EXC_STD, - KVMTEST_PR, 0x300) + KVMTEST, 0x300) . = 0x380 .globl data_access_slb_pSeries data_access_slb_pSeries: HMT_MEDIUM SET_SCRATCH0(r13) - EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x380) + EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x380) std r3,PACA_EXSLB+EX_R3(r13) mfspr r3,SPRN_DAR #ifdef __DISABLED__ @@ -329,8 +329,8 @@ do_stab_bolted_pSeries: EXCEPTION_PROLOG_PSERIES_1(.do_stab_bolted, EXC_STD) #endif /* CONFIG_POWER4_ONLY */ - KVM_HANDLER_PR_SKIP(PACA_EXGEN, EXC_STD, 0x300) - KVM_HANDLER_PR_SKIP(PACA_EXSLB, EXC_STD, 0x380) + KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x300) + KVM_HANDLER_SKIP(PACA_EXSLB, EXC_STD, 0x380) KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x400) KVM_HANDLER_PR(PACA_EXSLB, EXC_STD, 0x480) KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x900) diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index b904c40a17b..2d31519b863 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -34,8 +34,6 @@ #include #include -#define VRMA_VSID 0x1ffffffUL /* 1TB VSID reserved for VRMA */ - /* POWER7 has 10-bit LPIDs, PPC970 has 6-bit LPIDs */ #define MAX_LPID_970 63 #define NR_LPIDS (LPID_RSVD + 1) @@ -298,16 +296,18 @@ long kvmppc_virtmode_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, if (!psize) return H_PARAMETER; + pteh &= ~(HPTE_V_HVLOCK | HPTE_V_ABSENT | HPTE_V_VALID); + /* Find the memslot (if any) for this address */ gpa = (ptel & HPTE_R_RPN) & ~(psize - 1); gfn = gpa >> PAGE_SHIFT; memslot = gfn_to_memslot(kvm, gfn); - if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) - return H_PARAMETER; - if (!slot_is_aligned(memslot, psize)) - return H_PARAMETER; - if (kvmppc_get_guest_page(kvm, gfn, memslot, psize) < 0) - return H_PARAMETER; + if (memslot && !(memslot->flags & KVM_MEMSLOT_INVALID)) { + if (!slot_is_aligned(memslot, psize)) + return H_PARAMETER; + if (kvmppc_get_guest_page(kvm, gfn, memslot, psize) < 0) + return H_PARAMETER; + } preempt_disable(); ret = kvmppc_h_enter(vcpu, flags, pte_index, pteh, ptel); @@ -321,10 +321,218 @@ long kvmppc_virtmode_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, } +static struct kvmppc_slb *kvmppc_mmu_book3s_hv_find_slbe(struct kvm_vcpu *vcpu, + gva_t eaddr) +{ + u64 mask; + int i; + + for (i = 0; i < vcpu->arch.slb_nr; i++) { + if (!(vcpu->arch.slb[i].orige & SLB_ESID_V)) + continue; + + if (vcpu->arch.slb[i].origv & SLB_VSID_B_1T) + mask = ESID_MASK_1T; + else + mask = ESID_MASK; + + if (((vcpu->arch.slb[i].orige ^ eaddr) & mask) == 0) + return &vcpu->arch.slb[i]; + } + return NULL; +} + +static unsigned long kvmppc_mmu_get_real_addr(unsigned long v, unsigned long r, + unsigned long ea) +{ + unsigned long ra_mask; + + ra_mask = hpte_page_size(v, r) - 1; + return (r & HPTE_R_RPN & ~ra_mask) | (ea & ra_mask); +} + static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, - struct kvmppc_pte *gpte, bool data) + struct kvmppc_pte *gpte, bool data) { - return -ENOENT; + struct kvm *kvm = vcpu->kvm; + struct kvmppc_slb *slbe; + unsigned long slb_v; + unsigned long pp, key; + unsigned long v, gr; + unsigned long *hptep; + int index; + int virtmode = vcpu->arch.shregs.msr & (data ? MSR_DR : MSR_IR); + + /* Get SLB entry */ + if (virtmode) { + slbe = kvmppc_mmu_book3s_hv_find_slbe(vcpu, eaddr); + if (!slbe) + return -EINVAL; + slb_v = slbe->origv; + } else { + /* real mode access */ + slb_v = vcpu->kvm->arch.vrma_slb_v; + } + + /* Find the HPTE in the hash table */ + index = kvmppc_hv_find_lock_hpte(kvm, eaddr, slb_v, + HPTE_V_VALID | HPTE_V_ABSENT); + if (index < 0) + return -ENOENT; + hptep = (unsigned long *)(kvm->arch.hpt_virt + (index << 4)); + v = hptep[0] & ~HPTE_V_HVLOCK; + gr = kvm->arch.revmap[index].guest_rpte; + + /* Unlock the HPTE */ + asm volatile("lwsync" : : : "memory"); + hptep[0] = v; + + gpte->eaddr = eaddr; + gpte->vpage = ((v & HPTE_V_AVPN) << 4) | ((eaddr >> 12) & 0xfff); + + /* Get PP bits and key for permission check */ + pp = gr & (HPTE_R_PP0 | HPTE_R_PP); + key = (vcpu->arch.shregs.msr & MSR_PR) ? SLB_VSID_KP : SLB_VSID_KS; + key &= slb_v; + + /* Calculate permissions */ + gpte->may_read = hpte_read_permission(pp, key); + gpte->may_write = hpte_write_permission(pp, key); + gpte->may_execute = gpte->may_read && !(gr & (HPTE_R_N | HPTE_R_G)); + + /* Storage key permission check for POWER7 */ + if (data && virtmode && cpu_has_feature(CPU_FTR_ARCH_206)) { + int amrfield = hpte_get_skey_perm(gr, vcpu->arch.amr); + if (amrfield & 1) + gpte->may_read = 0; + if (amrfield & 2) + gpte->may_write = 0; + } + + /* Get the guest physical address */ + gpte->raddr = kvmppc_mmu_get_real_addr(v, gr, eaddr); + return 0; +} + +/* + * Quick test for whether an instruction is a load or a store. + * If the instruction is a load or a store, then this will indicate + * which it is, at least on server processors. (Embedded processors + * have some external PID instructions that don't follow the rule + * embodied here.) If the instruction isn't a load or store, then + * this doesn't return anything useful. + */ +static int instruction_is_store(unsigned int instr) +{ + unsigned int mask; + + mask = 0x10000000; + if ((instr & 0xfc000000) == 0x7c000000) + mask = 0x100; /* major opcode 31 */ + return (instr & mask) != 0; +} + +static int kvmppc_hv_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu, + unsigned long gpa, int is_store) +{ + int ret; + u32 last_inst; + unsigned long srr0 = kvmppc_get_pc(vcpu); + + /* We try to load the last instruction. We don't let + * emulate_instruction do it as it doesn't check what + * kvmppc_ld returns. + * If we fail, we just return to the guest and try executing it again. + */ + if (vcpu->arch.last_inst == KVM_INST_FETCH_FAILED) { + ret = kvmppc_ld(vcpu, &srr0, sizeof(u32), &last_inst, false); + if (ret != EMULATE_DONE || last_inst == KVM_INST_FETCH_FAILED) + return RESUME_GUEST; + vcpu->arch.last_inst = last_inst; + } + + /* + * WARNING: We do not know for sure whether the instruction we just + * read from memory is the same that caused the fault in the first + * place. If the instruction we read is neither an load or a store, + * then it can't access memory, so we don't need to worry about + * enforcing access permissions. So, assuming it is a load or + * store, we just check that its direction (load or store) is + * consistent with the original fault, since that's what we + * checked the access permissions against. If there is a mismatch + * we just return and retry the instruction. + */ + + if (instruction_is_store(vcpu->arch.last_inst) != !!is_store) + return RESUME_GUEST; + + /* + * Emulated accesses are emulated by looking at the hash for + * translation once, then performing the access later. The + * translation could be invalidated in the meantime in which + * point performing the subsequent memory access on the old + * physical address could possibly be a security hole for the + * guest (but not the host). + * + * This is less of an issue for MMIO stores since they aren't + * globally visible. It could be an issue for MMIO loads to + * a certain extent but we'll ignore it for now. + */ + + vcpu->arch.paddr_accessed = gpa; + return kvmppc_emulate_mmio(run, vcpu); +} + +int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, + unsigned long ea, unsigned long dsisr) +{ + struct kvm *kvm = vcpu->kvm; + unsigned long *hptep, hpte[3]; + unsigned long psize; + unsigned long gfn; + struct kvm_memory_slot *memslot; + struct revmap_entry *rev; + long index; + + /* + * Real-mode code has already searched the HPT and found the + * entry we're interested in. Lock the entry and check that + * it hasn't changed. If it has, just return and re-execute the + * instruction. + */ + if (ea != vcpu->arch.pgfault_addr) + return RESUME_GUEST; + index = vcpu->arch.pgfault_index; + hptep = (unsigned long *)(kvm->arch.hpt_virt + (index << 4)); + rev = &kvm->arch.revmap[index]; + preempt_disable(); + while (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) + cpu_relax(); + hpte[0] = hptep[0] & ~HPTE_V_HVLOCK; + hpte[1] = hptep[1]; + hpte[2] = rev->guest_rpte; + asm volatile("lwsync" : : : "memory"); + hptep[0] = hpte[0]; + preempt_enable(); + + if (hpte[0] != vcpu->arch.pgfault_hpte[0] || + hpte[1] != vcpu->arch.pgfault_hpte[1]) + return RESUME_GUEST; + + /* Translate the logical address and get the page */ + psize = hpte_page_size(hpte[0], hpte[1]); + gfn = hpte_rpn(hpte[2], psize); + memslot = gfn_to_memslot(kvm, gfn); + + /* No memslot means it's an emulated MMIO region */ + if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) { + unsigned long gpa = (gfn << PAGE_SHIFT) | (ea & (psize - 1)); + return kvmppc_hv_emulate_mmio(run, vcpu, gpa, + dsisr & DSISR_ISSTORE); + } + + /* should never get here otherwise */ + return -EFAULT; } void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa, diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 6ed0a84ef91..45aabb9a527 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -326,19 +326,18 @@ static int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu, break; } /* - * We get these next two if the guest does a bad real-mode access, - * as we have enabled VRMA (virtualized real mode area) mode in the - * LPCR. We just generate an appropriate DSI/ISI to the guest. + * We get this if the guest accesses a page which it thinks + * it has mapped but which is not actually present, because + * it is for an emulated I/O device. + * Any other HDSI interrupt has been handled already. */ case BOOK3S_INTERRUPT_H_DATA_STORAGE: - vcpu->arch.shregs.dsisr = vcpu->arch.fault_dsisr; - vcpu->arch.shregs.dar = vcpu->arch.fault_dar; - kvmppc_inject_interrupt(vcpu, BOOK3S_INTERRUPT_DATA_STORAGE, 0); - r = RESUME_GUEST; + r = kvmppc_book3s_hv_page_fault(run, vcpu, + vcpu->arch.fault_dar, vcpu->arch.fault_dsisr); break; case BOOK3S_INTERRUPT_H_INST_STORAGE: kvmppc_inject_interrupt(vcpu, BOOK3S_INTERRUPT_INST_STORAGE, - 0x08000000); + vcpu->arch.shregs.msr & 0x58000000); r = RESUME_GUEST; break; /* @@ -1195,6 +1194,8 @@ static int kvmppc_hv_setup_rma(struct kvm_vcpu *vcpu) /* Update VRMASD field in the LPCR */ senc = slb_pgsize_encoding(psize); + kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T | + (VRMA_VSID << SLB_VSID_SHIFT_1T); lpcr = kvm->arch.lpcr & ~LPCR_VRMASD; lpcr |= senc << (LPCR_VRMASD_SH - 4); kvm->arch.lpcr = lpcr; @@ -1291,7 +1292,9 @@ int kvmppc_core_init_vm(struct kvm *kvm) kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR); lpcr &= LPCR_PECE | LPCR_LPES; lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE | - LPCR_VPM0 | LPCR_VRMA_L; + LPCR_VPM0 | LPCR_VPM1; + kvm->arch.vrma_slb_v = SLB_VSID_B_1T | + (VRMA_VSID << SLB_VSID_SHIFT_1T); } kvm->arch.lpcr = lpcr; diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c index 5b31caa4b31..a5176dc37e7 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c @@ -136,13 +136,23 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, psize = hpte_page_size(pteh, ptel); if (!psize) return H_PARAMETER; + pteh &= ~(HPTE_V_HVLOCK | HPTE_V_ABSENT | HPTE_V_VALID); /* Find the memslot (if any) for this address */ gpa = (ptel & HPTE_R_RPN) & ~(psize - 1); gfn = gpa >> PAGE_SHIFT; memslot = builtin_gfn_to_memslot(kvm, gfn); - if (!(memslot && !(memslot->flags & KVM_MEMSLOT_INVALID))) - return H_PARAMETER; + pa = 0; + rmap = NULL; + if (!(memslot && !(memslot->flags & KVM_MEMSLOT_INVALID))) { + /* PPC970 can't do emulated MMIO */ + if (!cpu_has_feature(CPU_FTR_ARCH_206)) + return H_PARAMETER; + /* Emulated MMIO - mark this with key=31 */ + pteh |= HPTE_V_ABSENT; + ptel |= HPTE_R_KEY_HI | HPTE_R_KEY_LO; + goto do_insert; + } /* Check if the requested page fits entirely in the memslot. */ if (!slot_is_aligned(memslot, psize)) @@ -170,6 +180,7 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, ptel &= ~(HPTE_R_PP0 - psize); ptel |= pa; + pteh |= HPTE_V_VALID; /* Check WIMG */ if (!hpte_cache_flags_ok(ptel, is_io)) { @@ -182,9 +193,8 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, ptel &= ~(HPTE_R_W|HPTE_R_I|HPTE_R_G); ptel |= HPTE_R_M; } - pteh &= ~0x60UL; - pteh |= HPTE_V_VALID; + do_insert: if (pte_index >= HPT_NPTE) return H_PARAMETER; if (likely((flags & H_EXACT) == 0)) { @@ -192,7 +202,8 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); for (i = 0; i < 8; ++i) { if ((*hpte & HPTE_V_VALID) == 0 && - try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID)) + try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID | + HPTE_V_ABSENT)) break; hpte += 2; } @@ -207,7 +218,7 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, for (i = 0; i < 8; ++i) { while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) cpu_relax(); - if ((*hpte & HPTE_V_VALID) == 0) + if (!(*hpte & (HPTE_V_VALID | HPTE_V_ABSENT))) break; *hpte &= ~HPTE_V_HVLOCK; hpte += 2; @@ -218,11 +229,12 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, pte_index += i; } else { hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); - if (!try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID)) { + if (!try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID | + HPTE_V_ABSENT)) { /* Lock the slot and check again */ while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) cpu_relax(); - if (*hpte & HPTE_V_VALID) { + if (*hpte & (HPTE_V_VALID | HPTE_V_ABSENT)) { *hpte &= ~HPTE_V_HVLOCK; return H_PTEG_FULL; } @@ -237,10 +249,12 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, rev->guest_rpte = g_ptel; /* Link HPTE into reverse-map chain */ - if (realmode) - rmap = real_vmalloc_addr(rmap); - lock_rmap(rmap); - kvmppc_add_revmap_chain(kvm, rev, rmap, pte_index, realmode); + if (pteh & HPTE_V_VALID) { + if (realmode) + rmap = real_vmalloc_addr(rmap); + lock_rmap(rmap); + kvmppc_add_revmap_chain(kvm, rev, rmap, pte_index, realmode); + } hpte[1] = ptel; @@ -287,7 +301,7 @@ long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags, hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) cpu_relax(); - if ((hpte[0] & HPTE_V_VALID) == 0 || + if ((hpte[0] & (HPTE_V_ABSENT | HPTE_V_VALID)) == 0 || ((flags & H_AVPN) && (hpte[0] & ~0x7fUL) != avpn) || ((flags & H_ANDCOND) && (hpte[0] & avpn) != 0)) { hpte[0] &= ~HPTE_V_HVLOCK; @@ -298,11 +312,14 @@ long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags, vcpu->arch.gpr[4] = v = hpte[0] & ~HPTE_V_HVLOCK; vcpu->arch.gpr[5] = r = hpte[1]; rb = compute_tlbie_rb(v, r, pte_index); - remove_revmap_chain(kvm, pte_index, v); + if (v & HPTE_V_VALID) + remove_revmap_chain(kvm, pte_index, v); smp_wmb(); hpte[0] = 0; + if (!(v & HPTE_V_VALID)) + return H_SUCCESS; if (!(flags & H_LOCAL)) { - while(!try_lock_tlbie(&kvm->arch.tlbie_lock)) + while (!try_lock_tlbie(&kvm->arch.tlbie_lock)) cpu_relax(); asm volatile("ptesync" : : : "memory"); asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync" @@ -349,7 +366,7 @@ long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu) while (!try_lock_hpte(hp, HPTE_V_HVLOCK)) cpu_relax(); found = 0; - if (hp[0] & HPTE_V_VALID) { + if (hp[0] & (HPTE_V_ABSENT | HPTE_V_VALID)) { switch (flags & 3) { case 0: /* absolute */ found = 1; @@ -372,8 +389,10 @@ long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu) /* insert R and C bits from PTE */ flags |= (hp[1] >> 5) & 0x0c; args[i * 2] = ((0x80 | flags) << 56) + pte_index; - tlbrb[n_inval++] = compute_tlbie_rb(hp[0], hp[1], pte_index); - remove_revmap_chain(kvm, pte_index, hp[0]); + if (hp[0] & HPTE_V_VALID) { + tlbrb[n_inval++] = compute_tlbie_rb(hp[0], hp[1], pte_index); + remove_revmap_chain(kvm, pte_index, hp[0]); + } smp_wmb(); hp[0] = 0; } @@ -409,14 +428,16 @@ long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags, if (pte_index >= HPT_NPTE) return H_PARAMETER; + hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) cpu_relax(); - if ((hpte[0] & HPTE_V_VALID) == 0 || + if ((hpte[0] & (HPTE_V_ABSENT | HPTE_V_VALID)) == 0 || ((flags & H_AVPN) && (hpte[0] & ~0x7fUL) != avpn)) { hpte[0] &= ~HPTE_V_HVLOCK; return H_NOT_FOUND; } + if (atomic_read(&kvm->online_vcpus) == 1) flags |= H_LOCAL; v = hpte[0]; @@ -435,20 +456,22 @@ long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags, r = (hpte[1] & ~mask) | bits; /* Update HPTE */ - rb = compute_tlbie_rb(v, r, pte_index); - hpte[0] = v & ~HPTE_V_VALID; - if (!(flags & H_LOCAL)) { - while(!try_lock_tlbie(&kvm->arch.tlbie_lock)) - cpu_relax(); - asm volatile("ptesync" : : : "memory"); - asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync" - : : "r" (rb), "r" (kvm->arch.lpid)); - asm volatile("ptesync" : : : "memory"); - kvm->arch.tlbie_lock = 0; - } else { - asm volatile("ptesync" : : : "memory"); - asm volatile("tlbiel %0" : : "r" (rb)); - asm volatile("ptesync" : : : "memory"); + if (v & HPTE_V_VALID) { + rb = compute_tlbie_rb(v, r, pte_index); + hpte[0] = v & ~HPTE_V_VALID; + if (!(flags & H_LOCAL)) { + while(!try_lock_tlbie(&kvm->arch.tlbie_lock)) + cpu_relax(); + asm volatile("ptesync" : : : "memory"); + asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync" + : : "r" (rb), "r" (kvm->arch.lpid)); + asm volatile("ptesync" : : : "memory"); + kvm->arch.tlbie_lock = 0; + } else { + asm volatile("ptesync" : : : "memory"); + asm volatile("tlbiel %0" : : "r" (rb)); + asm volatile("ptesync" : : : "memory"); + } } hpte[1] = r; eieio(); @@ -461,7 +484,7 @@ long kvmppc_h_read(struct kvm_vcpu *vcpu, unsigned long flags, unsigned long pte_index) { struct kvm *kvm = vcpu->kvm; - unsigned long *hpte, r; + unsigned long *hpte, v, r; int i, n = 1; struct revmap_entry *rev = NULL; @@ -475,15 +498,182 @@ long kvmppc_h_read(struct kvm_vcpu *vcpu, unsigned long flags, rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); for (i = 0; i < n; ++i, ++pte_index) { hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); + v = hpte[0] & ~HPTE_V_HVLOCK; r = hpte[1]; - if (hpte[0] & HPTE_V_VALID) { + if (v & HPTE_V_ABSENT) { + v &= ~HPTE_V_ABSENT; + v |= HPTE_V_VALID; + } + if (v & HPTE_V_VALID) { if (rev) r = rev[i].guest_rpte; else r = hpte[1] | HPTE_R_RPN; } - vcpu->arch.gpr[4 + i * 2] = hpte[0]; + vcpu->arch.gpr[4 + i * 2] = v; vcpu->arch.gpr[5 + i * 2] = r; } return H_SUCCESS; } + +static int slb_base_page_shift[4] = { + 24, /* 16M */ + 16, /* 64k */ + 34, /* 16G */ + 20, /* 1M, unsupported */ +}; + +long kvmppc_hv_find_lock_hpte(struct kvm *kvm, gva_t eaddr, unsigned long slb_v, + unsigned long valid) +{ + unsigned int i; + unsigned int pshift; + unsigned long somask; + unsigned long vsid, hash; + unsigned long avpn; + unsigned long *hpte; + unsigned long mask, val; + unsigned long v, r; + + /* Get page shift, work out hash and AVPN etc. */ + mask = SLB_VSID_B | HPTE_V_AVPN | HPTE_V_SECONDARY; + val = 0; + pshift = 12; + if (slb_v & SLB_VSID_L) { + mask |= HPTE_V_LARGE; + val |= HPTE_V_LARGE; + pshift = slb_base_page_shift[(slb_v & SLB_VSID_LP) >> 4]; + } + if (slb_v & SLB_VSID_B_1T) { + somask = (1UL << 40) - 1; + vsid = (slb_v & ~SLB_VSID_B) >> SLB_VSID_SHIFT_1T; + vsid ^= vsid << 25; + } else { + somask = (1UL << 28) - 1; + vsid = (slb_v & ~SLB_VSID_B) >> SLB_VSID_SHIFT; + } + hash = (vsid ^ ((eaddr & somask) >> pshift)) & HPT_HASH_MASK; + avpn = slb_v & ~(somask >> 16); /* also includes B */ + avpn |= (eaddr & somask) >> 16; + + if (pshift >= 24) + avpn &= ~((1UL << (pshift - 16)) - 1); + else + avpn &= ~0x7fUL; + val |= avpn; + + for (;;) { + hpte = (unsigned long *)(kvm->arch.hpt_virt + (hash << 7)); + + for (i = 0; i < 16; i += 2) { + /* Read the PTE racily */ + v = hpte[i] & ~HPTE_V_HVLOCK; + + /* Check valid/absent, hash, segment size and AVPN */ + if (!(v & valid) || (v & mask) != val) + continue; + + /* Lock the PTE and read it under the lock */ + while (!try_lock_hpte(&hpte[i], HPTE_V_HVLOCK)) + cpu_relax(); + v = hpte[i] & ~HPTE_V_HVLOCK; + r = hpte[i+1]; + + /* + * Check the HPTE again, including large page size + * Since we don't currently allow any MPSS (mixed + * page-size segment) page sizes, it is sufficient + * to check against the actual page size. + */ + if ((v & valid) && (v & mask) == val && + hpte_page_size(v, r) == (1ul << pshift)) + /* Return with the HPTE still locked */ + return (hash << 3) + (i >> 1); + + /* Unlock and move on */ + hpte[i] = v; + } + + if (val & HPTE_V_SECONDARY) + break; + val |= HPTE_V_SECONDARY; + hash = hash ^ HPT_HASH_MASK; + } + return -1; +} +EXPORT_SYMBOL(kvmppc_hv_find_lock_hpte); + +/* + * Called in real mode to check whether an HPTE not found fault + * is due to accessing an emulated MMIO page. + * Returns a possibly modified status (DSISR) value if not + * (i.e. pass the interrupt to the guest), + * -1 to pass the fault up to host kernel mode code, -2 to do that + * and also load the instruction word, + * or 0 if we should make the guest retry the access. + */ +long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr, + unsigned long slb_v, unsigned int status) +{ + struct kvm *kvm = vcpu->kvm; + long int index; + unsigned long v, r, gr; + unsigned long *hpte; + unsigned long valid; + struct revmap_entry *rev; + unsigned long pp, key; + + valid = HPTE_V_VALID | HPTE_V_ABSENT; + index = kvmppc_hv_find_lock_hpte(kvm, addr, slb_v, valid); + if (index < 0) + return status; /* there really was no HPTE */ + + hpte = (unsigned long *)(kvm->arch.hpt_virt + (index << 4)); + v = hpte[0] & ~HPTE_V_HVLOCK; + r = hpte[1]; + rev = real_vmalloc_addr(&kvm->arch.revmap[index]); + gr = rev->guest_rpte; + + /* Unlock the HPTE */ + asm volatile("lwsync" : : : "memory"); + hpte[0] = v; + + /* If the HPTE is valid by now, retry the instruction */ + if (v & HPTE_V_VALID) + return 0; + + /* Check access permissions to the page */ + pp = gr & (HPTE_R_PP0 | HPTE_R_PP); + key = (vcpu->arch.shregs.msr & MSR_PR) ? SLB_VSID_KP : SLB_VSID_KS; + if (status & DSISR_ISSTORE) { + /* check write permission */ + if (!hpte_write_permission(pp, slb_v & key)) + goto protfault; + } else { + if (!hpte_read_permission(pp, slb_v & key)) + goto protfault; + } + + /* Check storage key, if applicable */ + if (vcpu->arch.shregs.msr & MSR_DR) { + unsigned int perm = hpte_get_skey_perm(gr, vcpu->arch.amr); + if (status & DSISR_ISSTORE) + perm >>= 1; + if (perm & 1) + return (status & ~DSISR_NOHPTE) | DSISR_KEYFAULT; + } + + /* Save HPTE info for virtual-mode handler */ + vcpu->arch.pgfault_addr = addr; + vcpu->arch.pgfault_index = index; + vcpu->arch.pgfault_hpte[0] = v; + vcpu->arch.pgfault_hpte[1] = r; + + if (vcpu->arch.shregs.msr & MSR_IR) + return -2; /* MMIO emulation - load instr word */ + + return -1; /* send fault up to host kernel mode */ + + protfault: + return (status & ~DSISR_NOHPTE) | DSISR_PROTFAULT; +} diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S index 5c8b26183f5..d07b64d5f37 100644 --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -601,6 +601,28 @@ kvmppc_interrupt: stw r12,VCPU_TRAP(r9) + /* Save HEIR (HV emulation assist reg) in last_inst + if this is an HEI (HV emulation interrupt, e40) */ + li r3,KVM_INST_FETCH_FAILED +BEGIN_FTR_SECTION + cmpwi r12,BOOK3S_INTERRUPT_H_EMUL_ASSIST + bne 11f + mfspr r3,SPRN_HEIR +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) +11: stw r3,VCPU_LAST_INST(r9) + + /* these are volatile across C function calls */ + mfctr r3 + mfxer r4 + std r3, VCPU_CTR(r9) + stw r4, VCPU_XER(r9) + +BEGIN_FTR_SECTION + /* If this is a page table miss then see if it's theirs or ours */ + cmpwi r12, BOOK3S_INTERRUPT_H_DATA_STORAGE + beq kvmppc_hdsi +END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) + /* See if this is a leftover HDEC interrupt */ cmpwi r12,BOOK3S_INTERRUPT_HV_DECREMENTER bne 2f @@ -608,7 +630,7 @@ kvmppc_interrupt: cmpwi r3,0 bge ignore_hdec 2: - /* See if this is something we can handle in real mode */ + /* See if this is an hcall we can handle in real mode */ cmpwi r12,BOOK3S_INTERRUPT_SYSCALL beq hcall_try_real_mode @@ -624,6 +646,7 @@ BEGIN_FTR_SECTION 1: END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) +nohpte_cont: hcall_real_cont: /* r9 = vcpu, r12 = trap, r13 = paca */ /* Save DEC */ mfspr r5,SPRN_DEC @@ -632,36 +655,21 @@ hcall_real_cont: /* r9 = vcpu, r12 = trap, r13 = paca */ add r5,r5,r6 std r5,VCPU_DEC_EXPIRES(r9) - /* Save HEIR (HV emulation assist reg) in last_inst - if this is an HEI (HV emulation interrupt, e40) */ - li r3,-1 -BEGIN_FTR_SECTION - cmpwi r12,BOOK3S_INTERRUPT_H_EMUL_ASSIST - bne 11f - mfspr r3,SPRN_HEIR -END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) -11: stw r3,VCPU_LAST_INST(r9) - /* Save more register state */ - mfxer r5 mfdar r6 mfdsisr r7 - mfctr r8 - - stw r5, VCPU_XER(r9) std r6, VCPU_DAR(r9) stw r7, VCPU_DSISR(r9) - std r8, VCPU_CTR(r9) - /* grab HDAR & HDSISR if HV data storage interrupt (HDSI) */ BEGIN_FTR_SECTION + /* don't overwrite fault_dar/fault_dsisr if HDSI */ cmpwi r12,BOOK3S_INTERRUPT_H_DATA_STORAGE beq 6f END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) -7: std r6, VCPU_FAULT_DAR(r9) + std r6, VCPU_FAULT_DAR(r9) stw r7, VCPU_FAULT_DSISR(r9) /* Save guest CTRL register, set runlatch to 1 */ - mfspr r6,SPRN_CTRLF +6: mfspr r6,SPRN_CTRLF stw r6,VCPU_CTRL(r9) andi. r0,r6,1 bne 4f @@ -1094,9 +1102,84 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) mtspr SPRN_HSRR1, r7 ba 0x500 -6: mfspr r6,SPRN_HDAR - mfspr r7,SPRN_HDSISR - b 7b +/* + * Check whether an HDSI is an HPTE not found fault or something else. + * If it is an HPTE not found fault that is due to the guest accessing + * a page that they have mapped but which we have paged out, then + * we continue on with the guest exit path. In all other cases, + * reflect the HDSI to the guest as a DSI. + */ +kvmppc_hdsi: + mfspr r4, SPRN_HDAR + mfspr r6, SPRN_HDSISR + /* HPTE not found fault? */ + andis. r0, r6, DSISR_NOHPTE@h + beq 1f /* if not, send it to the guest */ + andi. r0, r11, MSR_DR /* data relocation enabled? */ + beq 3f + clrrdi r0, r4, 28 + PPC_SLBFEE_DOT(r5, r0) /* if so, look up SLB */ + bne 1f /* if no SLB entry found */ +4: std r4, VCPU_FAULT_DAR(r9) + stw r6, VCPU_FAULT_DSISR(r9) + + /* Search the hash table. */ + mr r3, r9 /* vcpu pointer */ + bl .kvmppc_hpte_hv_fault + ld r9, HSTATE_KVM_VCPU(r13) + ld r10, VCPU_PC(r9) + ld r11, VCPU_MSR(r9) + li r12, BOOK3S_INTERRUPT_H_DATA_STORAGE + cmpdi r3, 0 /* retry the instruction */ + beq 6f + cmpdi r3, -1 /* handle in kernel mode */ + beq nohpte_cont + cmpdi r3, -2 /* MMIO emulation; need instr word */ + beq 2f + + /* Synthesize a DSI for the guest */ + ld r4, VCPU_FAULT_DAR(r9) + mr r6, r3 +1: mtspr SPRN_DAR, r4 + mtspr SPRN_DSISR, r6 + mtspr SPRN_SRR0, r10 + mtspr SPRN_SRR1, r11 + li r10, BOOK3S_INTERRUPT_DATA_STORAGE + li r11, (MSR_ME << 1) | 1 /* synthesize MSR_SF | MSR_ME */ + rotldi r11, r11, 63 +6: ld r7, VCPU_CTR(r9) + lwz r8, VCPU_XER(r9) + mtctr r7 + mtxer r8 + mr r4, r9 + b fast_guest_return + +3: ld r5, VCPU_KVM(r9) /* not relocated, use VRMA */ + ld r5, KVM_VRMA_SLB_V(r5) + b 4b + + /* If this is for emulated MMIO, load the instruction word */ +2: li r8, KVM_INST_FETCH_FAILED /* In case lwz faults */ + + /* Set guest mode to 'jump over instruction' so if lwz faults + * we'll just continue at the next IP. */ + li r0, KVM_GUEST_MODE_SKIP + stb r0, HSTATE_IN_GUEST(r13) + + /* Do the access with MSR:DR enabled */ + mfmsr r3 + ori r4, r3, MSR_DR /* Enable paging for data */ + mtmsrd r4 + lwz r8, 0(r10) + mtmsrd r3 + + /* Store the result */ + stw r8, VCPU_LAST_INST(r9) + + /* Unset guest mode. */ + li r0, KVM_GUEST_MODE_NONE + stb r0, HSTATE_IN_GUEST(r13) + b nohpte_cont /* * Try to handle an hcall in real mode. -- cgit v1.2.3 From 342d3db763f2621ed4546ebf8f6c61cb29d7fbdb Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Mon, 12 Dec 2011 12:38:05 +0000 Subject: KVM: PPC: Implement MMU notifiers for Book3S HV guests This adds the infrastructure to enable us to page out pages underneath a Book3S HV guest, on processors that support virtualized partition memory, that is, POWER7. Instead of pinning all the guest's pages, we now look in the host userspace Linux page tables to find the mapping for a given guest page. Then, if the userspace Linux PTE gets invalidated, kvm_unmap_hva() gets called for that address, and we replace all the guest HPTEs that refer to that page with absent HPTEs, i.e. ones with the valid bit clear and the HPTE_V_ABSENT bit set, which will cause an HDSI when the guest tries to access them. Finally, the page fault handler is extended to reinstantiate the guest HPTE when the guest tries to access a page which has been paged out. Since we can't intercept the guest DSI and ISI interrupts on PPC970, we still have to pin all the guest pages on PPC970. We have a new flag, kvm->arch.using_mmu_notifiers, that indicates whether we can page guest pages out. If it is not set, the MMU notifier callbacks do nothing and everything operates as before. Signed-off-by: Paul Mackerras Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_book3s.h | 4 + arch/powerpc/include/asm/kvm_book3s_64.h | 31 ++++ arch/powerpc/include/asm/kvm_host.h | 16 ++ arch/powerpc/include/asm/reg.h | 3 + arch/powerpc/kvm/Kconfig | 1 + arch/powerpc/kvm/book3s_64_mmu_hv.c | 290 ++++++++++++++++++++++++++++--- arch/powerpc/kvm/book3s_hv.c | 25 +-- arch/powerpc/kvm/book3s_hv_rm_mmu.c | 140 +++++++++++---- arch/powerpc/kvm/book3s_hv_rmhandlers.S | 49 ++++++ arch/powerpc/kvm/powerpc.c | 3 + arch/powerpc/mm/hugetlbpage.c | 2 + 11 files changed, 499 insertions(+), 65 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h index 3a9e51f4339..9240cebf8ba 100644 --- a/arch/powerpc/include/asm/kvm_book3s.h +++ b/arch/powerpc/include/asm/kvm_book3s.h @@ -143,6 +143,10 @@ extern void kvmppc_set_bat(struct kvm_vcpu *vcpu, struct kvmppc_bat *bat, extern void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr); extern int kvmppc_emulate_paired_single(struct kvm_run *run, struct kvm_vcpu *vcpu); extern pfn_t kvmppc_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn); +extern void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev, + unsigned long *rmap, long pte_index, int realmode); +extern void kvmppc_invalidate_hpte(struct kvm *kvm, unsigned long *hptep, + unsigned long pte_index); extern void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long addr, unsigned long *nb_ret); extern void kvmppc_unpin_guest_page(struct kvm *kvm, void *addr); diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h index 79dc37fb86b..c21e46da4a3 100644 --- a/arch/powerpc/include/asm/kvm_book3s_64.h +++ b/arch/powerpc/include/asm/kvm_book3s_64.h @@ -136,6 +136,37 @@ static inline int hpte_cache_flags_ok(unsigned long ptel, unsigned long io_type) return (wimg & (HPTE_R_W | HPTE_R_I)) == io_type; } +/* + * Lock and read a linux PTE. If it's present and writable, atomically + * set dirty and referenced bits and return the PTE, otherwise return 0. + */ +static inline pte_t kvmppc_read_update_linux_pte(pte_t *p) +{ + pte_t pte, tmp; + + /* wait until _PAGE_BUSY is clear then set it atomically */ + __asm__ __volatile__ ( + "1: ldarx %0,0,%3\n" + " andi. %1,%0,%4\n" + " bne- 1b\n" + " ori %1,%0,%4\n" + " stdcx. %1,0,%3\n" + " bne- 1b" + : "=&r" (pte), "=&r" (tmp), "=m" (*p) + : "r" (p), "i" (_PAGE_BUSY) + : "cc"); + + if (pte_present(pte)) { + pte = pte_mkyoung(pte); + if (pte_write(pte)) + pte = pte_mkdirty(pte); + } + + *p = pte; /* clears _PAGE_BUSY */ + + return pte; +} + /* Return HPTE cache control bits corresponding to Linux pte bits */ static inline unsigned long hpte_cache_bits(unsigned long pte_val) { diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 937cacaaf23..968f3aa61cd 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -32,6 +32,7 @@ #include #include #include +#include #define KVM_MAX_VCPUS NR_CPUS #define KVM_MAX_VCORES NR_CPUS @@ -44,6 +45,19 @@ #define KVM_COALESCED_MMIO_PAGE_OFFSET 1 #endif +#ifdef CONFIG_KVM_BOOK3S_64_HV +#include + +#define KVM_ARCH_WANT_MMU_NOTIFIER + +struct kvm; +extern int kvm_unmap_hva(struct kvm *kvm, unsigned long hva); +extern int kvm_age_hva(struct kvm *kvm, unsigned long hva); +extern int kvm_test_age_hva(struct kvm *kvm, unsigned long hva); +extern void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte); + +#endif + /* We don't currently support large pages. */ #define KVM_HPAGE_GFN_SHIFT(x) 0 #define KVM_NR_PAGE_SIZES 1 @@ -212,6 +226,7 @@ struct kvm_arch { struct kvmppc_rma_info *rma; unsigned long vrma_slb_v; int rma_setup_done; + int using_mmu_notifiers; struct list_head spapr_tce_tables; spinlock_t slot_phys_lock; unsigned long *slot_phys[KVM_MEM_SLOTS_NUM]; @@ -460,6 +475,7 @@ struct kvm_vcpu_arch { struct list_head run_list; struct task_struct *run_task; struct kvm_run *kvm_run; + pgd_t *pgdir; #endif }; diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h index 16efb3151c2..35c9309bf03 100644 --- a/arch/powerpc/include/asm/reg.h +++ b/arch/powerpc/include/asm/reg.h @@ -495,6 +495,9 @@ #define SPRN_SPRG7 0x117 /* Special Purpose Register General 7 */ #define SPRN_SRR0 0x01A /* Save/Restore Register 0 */ #define SPRN_SRR1 0x01B /* Save/Restore Register 1 */ +#define SRR1_ISI_NOPT 0x40000000 /* ISI: Not found in hash */ +#define SRR1_ISI_N_OR_G 0x10000000 /* ISI: Access is no-exec or G */ +#define SRR1_ISI_PROT 0x08000000 /* ISI: Other protection fault */ #define SRR1_WAKEMASK 0x00380000 /* reason for wakeup */ #define SRR1_WAKESYSERR 0x00300000 /* System error */ #define SRR1_WAKEEE 0x00200000 /* External interrupt */ diff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig index 78133deb4b6..8f64709ae33 100644 --- a/arch/powerpc/kvm/Kconfig +++ b/arch/powerpc/kvm/Kconfig @@ -69,6 +69,7 @@ config KVM_BOOK3S_64 config KVM_BOOK3S_64_HV bool "KVM support for POWER7 and PPC970 using hypervisor mode in host" depends on KVM_BOOK3S_64 + select MMU_NOTIFIER ---help--- Support running unmodified book3s_64 guest kernels in virtual machines on POWER7 and PPC970 processors that have diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index 2d31519b863..83761dd8a92 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -281,8 +281,9 @@ static long kvmppc_get_guest_page(struct kvm *kvm, unsigned long gfn, } /* - * We come here on a H_ENTER call from the guest when - * we don't have the requested page pinned already. + * We come here on a H_ENTER call from the guest when we are not + * using mmu notifiers and we don't have the requested page pinned + * already. */ long kvmppc_virtmode_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, long pte_index, unsigned long pteh, unsigned long ptel) @@ -292,6 +293,9 @@ long kvmppc_virtmode_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, struct kvm_memory_slot *memslot; long ret; + if (kvm->arch.using_mmu_notifiers) + goto do_insert; + psize = hpte_page_size(pteh, ptel); if (!psize) return H_PARAMETER; @@ -309,9 +313,12 @@ long kvmppc_virtmode_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, return H_PARAMETER; } - preempt_disable(); + do_insert: + /* Protect linux PTE lookup from page table destruction */ + rcu_read_lock_sched(); /* this disables preemption too */ + vcpu->arch.pgdir = current->mm->pgd; ret = kvmppc_h_enter(vcpu, flags, pte_index, pteh, ptel); - preempt_enable(); + rcu_read_unlock_sched(); if (ret == H_TOO_HARD) { /* this can't happen */ pr_err("KVM: Oops, kvmppc_h_enter returned too hard!\n"); @@ -487,12 +494,16 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, unsigned long ea, unsigned long dsisr) { struct kvm *kvm = vcpu->kvm; - unsigned long *hptep, hpte[3]; - unsigned long psize; - unsigned long gfn; + unsigned long *hptep, hpte[3], r; + unsigned long mmu_seq, psize, pte_size; + unsigned long gfn, hva, pfn; struct kvm_memory_slot *memslot; + unsigned long *rmap; struct revmap_entry *rev; - long index; + struct page *page, *pages[1]; + long index, ret, npages; + unsigned long is_io; + struct vm_area_struct *vma; /* * Real-mode code has already searched the HPT and found the @@ -510,7 +521,7 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, cpu_relax(); hpte[0] = hptep[0] & ~HPTE_V_HVLOCK; hpte[1] = hptep[1]; - hpte[2] = rev->guest_rpte; + hpte[2] = r = rev->guest_rpte; asm volatile("lwsync" : : : "memory"); hptep[0] = hpte[0]; preempt_enable(); @@ -520,8 +531,8 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, return RESUME_GUEST; /* Translate the logical address and get the page */ - psize = hpte_page_size(hpte[0], hpte[1]); - gfn = hpte_rpn(hpte[2], psize); + psize = hpte_page_size(hpte[0], r); + gfn = hpte_rpn(r, psize); memslot = gfn_to_memslot(kvm, gfn); /* No memslot means it's an emulated MMIO region */ @@ -531,8 +542,228 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, dsisr & DSISR_ISSTORE); } - /* should never get here otherwise */ - return -EFAULT; + if (!kvm->arch.using_mmu_notifiers) + return -EFAULT; /* should never get here */ + + /* used to check for invalidations in progress */ + mmu_seq = kvm->mmu_notifier_seq; + smp_rmb(); + + is_io = 0; + pfn = 0; + page = NULL; + pte_size = PAGE_SIZE; + hva = gfn_to_hva_memslot(memslot, gfn); + npages = get_user_pages_fast(hva, 1, 1, pages); + if (npages < 1) { + /* Check if it's an I/O mapping */ + down_read(¤t->mm->mmap_sem); + vma = find_vma(current->mm, hva); + if (vma && vma->vm_start <= hva && hva + psize <= vma->vm_end && + (vma->vm_flags & VM_PFNMAP)) { + pfn = vma->vm_pgoff + + ((hva - vma->vm_start) >> PAGE_SHIFT); + pte_size = psize; + is_io = hpte_cache_bits(pgprot_val(vma->vm_page_prot)); + } + up_read(¤t->mm->mmap_sem); + if (!pfn) + return -EFAULT; + } else { + page = pages[0]; + if (PageHuge(page)) { + page = compound_head(page); + pte_size <<= compound_order(page); + } + pfn = page_to_pfn(page); + } + + ret = -EFAULT; + if (psize > pte_size) + goto out_put; + + /* Check WIMG vs. the actual page we're accessing */ + if (!hpte_cache_flags_ok(r, is_io)) { + if (is_io) + return -EFAULT; + /* + * Allow guest to map emulated device memory as + * uncacheable, but actually make it cacheable. + */ + r = (r & ~(HPTE_R_W|HPTE_R_I|HPTE_R_G)) | HPTE_R_M; + } + + /* Set the HPTE to point to pfn */ + r = (r & ~(HPTE_R_PP0 - pte_size)) | (pfn << PAGE_SHIFT); + ret = RESUME_GUEST; + preempt_disable(); + while (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) + cpu_relax(); + if ((hptep[0] & ~HPTE_V_HVLOCK) != hpte[0] || hptep[1] != hpte[1] || + rev->guest_rpte != hpte[2]) + /* HPTE has been changed under us; let the guest retry */ + goto out_unlock; + hpte[0] = (hpte[0] & ~HPTE_V_ABSENT) | HPTE_V_VALID; + + rmap = &memslot->rmap[gfn - memslot->base_gfn]; + lock_rmap(rmap); + + /* Check if we might have been invalidated; let the guest retry if so */ + ret = RESUME_GUEST; + if (mmu_notifier_retry(vcpu, mmu_seq)) { + unlock_rmap(rmap); + goto out_unlock; + } + kvmppc_add_revmap_chain(kvm, rev, rmap, index, 0); + + hptep[1] = r; + eieio(); + hptep[0] = hpte[0]; + asm volatile("ptesync" : : : "memory"); + preempt_enable(); + if (page) + SetPageDirty(page); + + out_put: + if (page) + put_page(page); + return ret; + + out_unlock: + hptep[0] &= ~HPTE_V_HVLOCK; + preempt_enable(); + goto out_put; +} + +static int kvm_handle_hva(struct kvm *kvm, unsigned long hva, + int (*handler)(struct kvm *kvm, unsigned long *rmapp, + unsigned long gfn)) +{ + int ret; + int retval = 0; + struct kvm_memslots *slots; + struct kvm_memory_slot *memslot; + + slots = kvm_memslots(kvm); + kvm_for_each_memslot(memslot, slots) { + unsigned long start = memslot->userspace_addr; + unsigned long end; + + end = start + (memslot->npages << PAGE_SHIFT); + if (hva >= start && hva < end) { + gfn_t gfn_offset = (hva - start) >> PAGE_SHIFT; + + ret = handler(kvm, &memslot->rmap[gfn_offset], + memslot->base_gfn + gfn_offset); + retval |= ret; + } + } + + return retval; +} + +static int kvm_unmap_rmapp(struct kvm *kvm, unsigned long *rmapp, + unsigned long gfn) +{ + struct revmap_entry *rev = kvm->arch.revmap; + unsigned long h, i, j; + unsigned long *hptep; + unsigned long ptel, psize; + + for (;;) { + while (test_and_set_bit_lock(KVMPPC_RMAP_LOCK_BIT, rmapp)) + cpu_relax(); + if (!(*rmapp & KVMPPC_RMAP_PRESENT)) { + __clear_bit_unlock(KVMPPC_RMAP_LOCK_BIT, rmapp); + break; + } + + /* + * To avoid an ABBA deadlock with the HPTE lock bit, + * we have to unlock the rmap chain before locking the HPTE. + * Thus we remove the first entry, unlock the rmap chain, + * lock the HPTE and then check that it is for the + * page we're unmapping before changing it to non-present. + */ + i = *rmapp & KVMPPC_RMAP_INDEX; + j = rev[i].forw; + if (j == i) { + /* chain is now empty */ + j = 0; + } else { + /* remove i from chain */ + h = rev[i].back; + rev[h].forw = j; + rev[j].back = h; + rev[i].forw = rev[i].back = i; + j |= KVMPPC_RMAP_PRESENT; + } + smp_wmb(); + *rmapp = j | (1ul << KVMPPC_RMAP_REF_BIT); + + /* Now lock, check and modify the HPTE */ + hptep = (unsigned long *) (kvm->arch.hpt_virt + (i << 4)); + while (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) + cpu_relax(); + ptel = rev[i].guest_rpte; + psize = hpte_page_size(hptep[0], ptel); + if ((hptep[0] & HPTE_V_VALID) && + hpte_rpn(ptel, psize) == gfn) { + kvmppc_invalidate_hpte(kvm, hptep, i); + hptep[0] |= HPTE_V_ABSENT; + } + hptep[0] &= ~HPTE_V_HVLOCK; + } + return 0; +} + +int kvm_unmap_hva(struct kvm *kvm, unsigned long hva) +{ + if (kvm->arch.using_mmu_notifiers) + kvm_handle_hva(kvm, hva, kvm_unmap_rmapp); + return 0; +} + +static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp, + unsigned long gfn) +{ + if (!kvm->arch.using_mmu_notifiers) + return 0; + if (!(*rmapp & KVMPPC_RMAP_REFERENCED)) + return 0; + kvm_unmap_rmapp(kvm, rmapp, gfn); + while (test_and_set_bit_lock(KVMPPC_RMAP_LOCK_BIT, rmapp)) + cpu_relax(); + __clear_bit(KVMPPC_RMAP_REF_BIT, rmapp); + __clear_bit_unlock(KVMPPC_RMAP_LOCK_BIT, rmapp); + return 1; +} + +int kvm_age_hva(struct kvm *kvm, unsigned long hva) +{ + if (!kvm->arch.using_mmu_notifiers) + return 0; + return kvm_handle_hva(kvm, hva, kvm_age_rmapp); +} + +static int kvm_test_age_rmapp(struct kvm *kvm, unsigned long *rmapp, + unsigned long gfn) +{ + return !!(*rmapp & KVMPPC_RMAP_REFERENCED); +} + +int kvm_test_age_hva(struct kvm *kvm, unsigned long hva) +{ + if (!kvm->arch.using_mmu_notifiers) + return 0; + return kvm_handle_hva(kvm, hva, kvm_test_age_rmapp); +} + +void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte) +{ + if (!kvm->arch.using_mmu_notifiers) + return; + kvm_handle_hva(kvm, hva, kvm_unmap_rmapp); } void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa, @@ -540,31 +771,42 @@ void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa, { struct kvm_memory_slot *memslot; unsigned long gfn = gpa >> PAGE_SHIFT; - struct page *page; - unsigned long psize, offset; + struct page *page, *pages[1]; + int npages; + unsigned long hva, psize, offset; unsigned long pa; unsigned long *physp; memslot = gfn_to_memslot(kvm, gfn); if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) return NULL; - physp = kvm->arch.slot_phys[memslot->id]; - if (!physp) - return NULL; - physp += gfn - memslot->base_gfn; - pa = *physp; - if (!pa) { - if (kvmppc_get_guest_page(kvm, gfn, memslot, PAGE_SIZE) < 0) + if (!kvm->arch.using_mmu_notifiers) { + physp = kvm->arch.slot_phys[memslot->id]; + if (!physp) return NULL; + physp += gfn - memslot->base_gfn; pa = *physp; + if (!pa) { + if (kvmppc_get_guest_page(kvm, gfn, memslot, + PAGE_SIZE) < 0) + return NULL; + pa = *physp; + } + page = pfn_to_page(pa >> PAGE_SHIFT); + } else { + hva = gfn_to_hva_memslot(memslot, gfn); + npages = get_user_pages_fast(hva, 1, 1, pages); + if (npages < 1) + return NULL; + page = pages[0]; } - page = pfn_to_page(pa >> PAGE_SHIFT); psize = PAGE_SIZE; if (PageHuge(page)) { page = compound_head(page); psize <<= compound_order(page); } - get_page(page); + if (!kvm->arch.using_mmu_notifiers) + get_page(page); offset = gpa & (psize - 1); if (nb_ret) *nb_ret = psize - offset; diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 45aabb9a527..86c4191cb75 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -326,19 +326,19 @@ static int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu, break; } /* - * We get this if the guest accesses a page which it thinks - * it has mapped but which is not actually present, because - * it is for an emulated I/O device. - * Any other HDSI interrupt has been handled already. + * We get these next two if the guest accesses a page which it thinks + * it has mapped but which is not actually present, either because + * it is for an emulated I/O device or because the corresonding + * host page has been paged out. Any other HDSI/HISI interrupts + * have been handled already. */ case BOOK3S_INTERRUPT_H_DATA_STORAGE: r = kvmppc_book3s_hv_page_fault(run, vcpu, vcpu->arch.fault_dar, vcpu->arch.fault_dsisr); break; case BOOK3S_INTERRUPT_H_INST_STORAGE: - kvmppc_inject_interrupt(vcpu, BOOK3S_INTERRUPT_INST_STORAGE, - vcpu->arch.shregs.msr & 0x58000000); - r = RESUME_GUEST; + r = kvmppc_book3s_hv_page_fault(run, vcpu, + kvmppc_get_pc(vcpu), 0); break; /* * This occurs if the guest executes an illegal instruction. @@ -867,6 +867,7 @@ int kvmppc_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu) flush_altivec_to_thread(current); flush_vsx_to_thread(current); vcpu->arch.wqp = &vcpu->arch.vcore->wq; + vcpu->arch.pgdir = current->mm->pgd; do { r = kvmppc_run_vcpu(run, vcpu); @@ -1090,9 +1091,9 @@ int kvmppc_core_prepare_memory_region(struct kvm *kvm, unsigned long *phys; /* Allocate a slot_phys array */ - npages = mem->memory_size >> PAGE_SHIFT; phys = kvm->arch.slot_phys[mem->slot]; - if (!phys) { + if (!kvm->arch.using_mmu_notifiers && !phys) { + npages = mem->memory_size >> PAGE_SHIFT; phys = vzalloc(npages * sizeof(unsigned long)); if (!phys) return -ENOMEM; @@ -1298,6 +1299,7 @@ int kvmppc_core_init_vm(struct kvm *kvm) } kvm->arch.lpcr = lpcr; + kvm->arch.using_mmu_notifiers = !!cpu_has_feature(CPU_FTR_ARCH_206); spin_lock_init(&kvm->arch.slot_phys_lock); return 0; } @@ -1306,8 +1308,9 @@ void kvmppc_core_destroy_vm(struct kvm *kvm) { unsigned long i; - for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) - unpin_slot(kvm, i); + if (!kvm->arch.using_mmu_notifiers) + for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) + unpin_slot(kvm, i); if (kvm->arch.rma) { kvm_release_rma(kvm->arch.rma); diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c index a5176dc37e7..81d16ed9767 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c @@ -58,7 +58,7 @@ static void *real_vmalloc_addr(void *x) * Add this HPTE into the chain for the real page. * Must be called with the chain locked; it unlocks the chain. */ -static void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev, +void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev, unsigned long *rmap, long pte_index, int realmode) { struct revmap_entry *head, *tail; @@ -83,6 +83,7 @@ static void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev, smp_wmb(); *rmap = i | KVMPPC_RMAP_REFERENCED | KVMPPC_RMAP_PRESENT; /* unlock */ } +EXPORT_SYMBOL_GPL(kvmppc_add_revmap_chain); /* Remove this HPTE from the chain for a real page */ static void remove_revmap_chain(struct kvm *kvm, long pte_index, @@ -118,12 +119,33 @@ static void remove_revmap_chain(struct kvm *kvm, long pte_index, unlock_rmap(rmap); } +static pte_t lookup_linux_pte(struct kvm_vcpu *vcpu, unsigned long hva, + unsigned long *pte_sizep) +{ + pte_t *ptep; + unsigned long ps = *pte_sizep; + unsigned int shift; + + ptep = find_linux_pte_or_hugepte(vcpu->arch.pgdir, hva, &shift); + if (!ptep) + return __pte(0); + if (shift) + *pte_sizep = 1ul << shift; + else + *pte_sizep = PAGE_SIZE; + if (ps > *pte_sizep) + return __pte(0); + if (!pte_present(*ptep)) + return __pte(0); + return kvmppc_read_update_linux_pte(ptep); +} + long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, long pte_index, unsigned long pteh, unsigned long ptel) { struct kvm *kvm = vcpu->kvm; unsigned long i, pa, gpa, gfn, psize; - unsigned long slot_fn; + unsigned long slot_fn, hva; unsigned long *hpte; struct revmap_entry *rev; unsigned long g_ptel = ptel; @@ -131,6 +153,8 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, unsigned long *physp, pte_size; unsigned long is_io; unsigned long *rmap; + pte_t pte; + unsigned long mmu_seq; bool realmode = vcpu->arch.vcore->vcore_state == VCORE_RUNNING; psize = hpte_page_size(pteh, ptel); @@ -138,11 +162,16 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, return H_PARAMETER; pteh &= ~(HPTE_V_HVLOCK | HPTE_V_ABSENT | HPTE_V_VALID); + /* used later to detect if we might have been invalidated */ + mmu_seq = kvm->mmu_notifier_seq; + smp_rmb(); + /* Find the memslot (if any) for this address */ gpa = (ptel & HPTE_R_RPN) & ~(psize - 1); gfn = gpa >> PAGE_SHIFT; memslot = builtin_gfn_to_memslot(kvm, gfn); pa = 0; + is_io = ~0ul; rmap = NULL; if (!(memslot && !(memslot->flags & KVM_MEMSLOT_INVALID))) { /* PPC970 can't do emulated MMIO */ @@ -160,19 +189,31 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, slot_fn = gfn - memslot->base_gfn; rmap = &memslot->rmap[slot_fn]; - physp = kvm->arch.slot_phys[memslot->id]; - if (!physp) - return H_PARAMETER; - physp += slot_fn; - if (realmode) - physp = real_vmalloc_addr(physp); - pa = *physp; - if (!pa) - return H_TOO_HARD; - is_io = pa & (HPTE_R_I | HPTE_R_W); - pte_size = PAGE_SIZE << (pa & KVMPPC_PAGE_ORDER_MASK); - pa &= PAGE_MASK; - + if (!kvm->arch.using_mmu_notifiers) { + physp = kvm->arch.slot_phys[memslot->id]; + if (!physp) + return H_PARAMETER; + physp += slot_fn; + if (realmode) + physp = real_vmalloc_addr(physp); + pa = *physp; + if (!pa) + return H_TOO_HARD; + is_io = pa & (HPTE_R_I | HPTE_R_W); + pte_size = PAGE_SIZE << (pa & KVMPPC_PAGE_ORDER_MASK); + pa &= PAGE_MASK; + } else { + /* Translate to host virtual address */ + hva = gfn_to_hva_memslot(memslot, gfn); + + /* Look up the Linux PTE for the backing page */ + pte_size = psize; + pte = lookup_linux_pte(vcpu, hva, &pte_size); + if (pte_present(pte)) { + is_io = hpte_cache_bits(pte_val(pte)); + pa = pte_pfn(pte) << PAGE_SHIFT; + } + } if (pte_size < psize) return H_PARAMETER; if (pa && pte_size > psize) @@ -180,10 +221,14 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, ptel &= ~(HPTE_R_PP0 - psize); ptel |= pa; - pteh |= HPTE_V_VALID; + + if (pa) + pteh |= HPTE_V_VALID; + else + pteh |= HPTE_V_ABSENT; /* Check WIMG */ - if (!hpte_cache_flags_ok(ptel, is_io)) { + if (is_io != ~0ul && !hpte_cache_flags_ok(ptel, is_io)) { if (is_io) return H_PARAMETER; /* @@ -194,6 +239,7 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, ptel |= HPTE_R_M; } + /* Find and lock the HPTEG slot to use */ do_insert: if (pte_index >= HPT_NPTE) return H_PARAMETER; @@ -253,7 +299,17 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, if (realmode) rmap = real_vmalloc_addr(rmap); lock_rmap(rmap); - kvmppc_add_revmap_chain(kvm, rev, rmap, pte_index, realmode); + /* Check for pending invalidations under the rmap chain lock */ + if (kvm->arch.using_mmu_notifiers && + mmu_notifier_retry(vcpu, mmu_seq)) { + /* inval in progress, write a non-present HPTE */ + pteh |= HPTE_V_ABSENT; + pteh &= ~HPTE_V_VALID; + unlock_rmap(rmap); + } else { + kvmppc_add_revmap_chain(kvm, rev, rmap, pte_index, + realmode); + } } hpte[1] = ptel; @@ -516,6 +572,23 @@ long kvmppc_h_read(struct kvm_vcpu *vcpu, unsigned long flags, return H_SUCCESS; } +void kvmppc_invalidate_hpte(struct kvm *kvm, unsigned long *hptep, + unsigned long pte_index) +{ + unsigned long rb; + + hptep[0] &= ~HPTE_V_VALID; + rb = compute_tlbie_rb(hptep[0], hptep[1], pte_index); + while (!try_lock_tlbie(&kvm->arch.tlbie_lock)) + cpu_relax(); + asm volatile("ptesync" : : : "memory"); + asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync" + : : "r" (rb), "r" (kvm->arch.lpid)); + asm volatile("ptesync" : : : "memory"); + kvm->arch.tlbie_lock = 0; +} +EXPORT_SYMBOL_GPL(kvmppc_invalidate_hpte); + static int slb_base_page_shift[4] = { 24, /* 16M */ 16, /* 64k */ @@ -605,15 +678,15 @@ EXPORT_SYMBOL(kvmppc_hv_find_lock_hpte); /* * Called in real mode to check whether an HPTE not found fault - * is due to accessing an emulated MMIO page. + * is due to accessing a paged-out page or an emulated MMIO page. * Returns a possibly modified status (DSISR) value if not * (i.e. pass the interrupt to the guest), * -1 to pass the fault up to host kernel mode code, -2 to do that - * and also load the instruction word, + * and also load the instruction word (for MMIO emulation), * or 0 if we should make the guest retry the access. */ long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr, - unsigned long slb_v, unsigned int status) + unsigned long slb_v, unsigned int status, bool data) { struct kvm *kvm = vcpu->kvm; long int index; @@ -624,6 +697,7 @@ long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr, unsigned long pp, key; valid = HPTE_V_VALID | HPTE_V_ABSENT; + index = kvmppc_hv_find_lock_hpte(kvm, addr, slb_v, valid); if (index < 0) return status; /* there really was no HPTE */ @@ -645,22 +719,28 @@ long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr, /* Check access permissions to the page */ pp = gr & (HPTE_R_PP0 | HPTE_R_PP); key = (vcpu->arch.shregs.msr & MSR_PR) ? SLB_VSID_KP : SLB_VSID_KS; - if (status & DSISR_ISSTORE) { + status &= ~DSISR_NOHPTE; /* DSISR_NOHPTE == SRR1_ISI_NOPT */ + if (!data) { + if (gr & (HPTE_R_N | HPTE_R_G)) + return status | SRR1_ISI_N_OR_G; + if (!hpte_read_permission(pp, slb_v & key)) + return status | SRR1_ISI_PROT; + } else if (status & DSISR_ISSTORE) { /* check write permission */ if (!hpte_write_permission(pp, slb_v & key)) - goto protfault; + return status | DSISR_PROTFAULT; } else { if (!hpte_read_permission(pp, slb_v & key)) - goto protfault; + return status | DSISR_PROTFAULT; } /* Check storage key, if applicable */ - if (vcpu->arch.shregs.msr & MSR_DR) { + if (data && (vcpu->arch.shregs.msr & MSR_DR)) { unsigned int perm = hpte_get_skey_perm(gr, vcpu->arch.amr); if (status & DSISR_ISSTORE) perm >>= 1; if (perm & 1) - return (status & ~DSISR_NOHPTE) | DSISR_KEYFAULT; + return status | DSISR_KEYFAULT; } /* Save HPTE info for virtual-mode handler */ @@ -669,11 +749,11 @@ long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr, vcpu->arch.pgfault_hpte[0] = v; vcpu->arch.pgfault_hpte[1] = r; - if (vcpu->arch.shregs.msr & MSR_IR) + /* Check the storage key to see if it is possibly emulated MMIO */ + if (data && (vcpu->arch.shregs.msr & MSR_IR) && + (r & (HPTE_R_KEY_HI | HPTE_R_KEY_LO)) == + (HPTE_R_KEY_HI | HPTE_R_KEY_LO)) return -2; /* MMIO emulation - load instr word */ return -1; /* send fault up to host kernel mode */ - - protfault: - return (status & ~DSISR_NOHPTE) | DSISR_PROTFAULT; } diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S index d07b64d5f37..7d4990665d0 100644 --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -621,6 +621,8 @@ BEGIN_FTR_SECTION /* If this is a page table miss then see if it's theirs or ours */ cmpwi r12, BOOK3S_INTERRUPT_H_DATA_STORAGE beq kvmppc_hdsi + cmpwi r12, BOOK3S_INTERRUPT_H_INST_STORAGE + beq kvmppc_hisi END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206) /* See if this is a leftover HDEC interrupt */ @@ -1125,6 +1127,7 @@ kvmppc_hdsi: /* Search the hash table. */ mr r3, r9 /* vcpu pointer */ + li r7, 1 /* data fault */ bl .kvmppc_hpte_hv_fault ld r9, HSTATE_KVM_VCPU(r13) ld r10, VCPU_PC(r9) @@ -1181,6 +1184,52 @@ kvmppc_hdsi: stb r0, HSTATE_IN_GUEST(r13) b nohpte_cont +/* + * Similarly for an HISI, reflect it to the guest as an ISI unless + * it is an HPTE not found fault for a page that we have paged out. + */ +kvmppc_hisi: + andis. r0, r11, SRR1_ISI_NOPT@h + beq 1f + andi. r0, r11, MSR_IR /* instruction relocation enabled? */ + beq 3f + clrrdi r0, r10, 28 + PPC_SLBFEE_DOT(r5, r0) /* if so, look up SLB */ + bne 1f /* if no SLB entry found */ +4: + /* Search the hash table. */ + mr r3, r9 /* vcpu pointer */ + mr r4, r10 + mr r6, r11 + li r7, 0 /* instruction fault */ + bl .kvmppc_hpte_hv_fault + ld r9, HSTATE_KVM_VCPU(r13) + ld r10, VCPU_PC(r9) + ld r11, VCPU_MSR(r9) + li r12, BOOK3S_INTERRUPT_H_INST_STORAGE + cmpdi r3, 0 /* retry the instruction */ + beq 6f + cmpdi r3, -1 /* handle in kernel mode */ + beq nohpte_cont + + /* Synthesize an ISI for the guest */ + mr r11, r3 +1: mtspr SPRN_SRR0, r10 + mtspr SPRN_SRR1, r11 + li r10, BOOK3S_INTERRUPT_INST_STORAGE + li r11, (MSR_ME << 1) | 1 /* synthesize MSR_SF | MSR_ME */ + rotldi r11, r11, 63 +6: ld r7, VCPU_CTR(r9) + lwz r8, VCPU_XER(r9) + mtctr r7 + mtxer r8 + mr r4, r9 + b fast_guest_return + +3: ld r6, VCPU_KVM(r9) /* not relocated, use VRMA */ + ld r5, KVM_VRMA_SLB_V(r6) + b 4b + /* * Try to handle an hcall in real mode. * Returns to the guest if we handle it, or continues on up to diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 4f85ac32258..06e955b5837 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -245,6 +245,9 @@ int kvm_dev_ioctl_check_extension(long ext) if (cpu_has_feature(CPU_FTR_ARCH_201)) r = 2; break; + case KVM_CAP_SYNC_MMU: + r = cpu_has_feature(CPU_FTR_ARCH_206) ? 1 : 0; + break; #endif default: r = 0; diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c index a8b3cc7d90f..f348c3d9040 100644 --- a/arch/powerpc/mm/hugetlbpage.c +++ b/arch/powerpc/mm/hugetlbpage.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #include #include @@ -103,6 +104,7 @@ pte_t *find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea, unsigned *shift *shift = hugepd_shift(*hpdp); return hugepte_offset(hpdp, ea, pdshift); } +EXPORT_SYMBOL_GPL(find_linux_pte_or_hugepte); pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) { -- cgit v1.2.3 From 4cf302bc106566c5bad523337296ea8b72df63f5 Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Mon, 12 Dec 2011 12:38:51 +0000 Subject: KVM: PPC: Allow for read-only pages backing a Book3S HV guest With this, if a guest does an H_ENTER with a read/write HPTE on a page which is currently read-only, we make the actual HPTE inserted be a read-only version of the HPTE. We now intercept protection faults as well as HPTE not found faults, and for a protection fault we work out whether it should be reflected to the guest (e.g. because the guest HPTE didn't allow write access to usermode) or handled by switching to kernel context and calling kvmppc_book3s_hv_page_fault, which will then request write access to the page and update the actual HPTE. Signed-off-by: Paul Mackerras Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_book3s_64.h | 20 ++++++++++++++-- arch/powerpc/kvm/book3s_64_mmu_hv.c | 39 +++++++++++++++++++++++++++++--- arch/powerpc/kvm/book3s_hv_rm_mmu.c | 32 ++++++++++++++++++-------- arch/powerpc/kvm/book3s_hv_rmhandlers.S | 4 ++-- 4 files changed, 78 insertions(+), 17 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h index c21e46da4a3..b0c08b14277 100644 --- a/arch/powerpc/include/asm/kvm_book3s_64.h +++ b/arch/powerpc/include/asm/kvm_book3s_64.h @@ -121,6 +121,22 @@ static inline unsigned long hpte_rpn(unsigned long ptel, unsigned long psize) return ((ptel & HPTE_R_RPN) & ~(psize - 1)) >> PAGE_SHIFT; } +static inline int hpte_is_writable(unsigned long ptel) +{ + unsigned long pp = ptel & (HPTE_R_PP0 | HPTE_R_PP); + + return pp != PP_RXRX && pp != PP_RXXX; +} + +static inline unsigned long hpte_make_readonly(unsigned long ptel) +{ + if ((ptel & HPTE_R_PP0) || (ptel & HPTE_R_PP) == PP_RWXX) + ptel = (ptel & ~HPTE_R_PP) | PP_RXXX; + else + ptel |= PP_RXRX; + return ptel; +} + static inline int hpte_cache_flags_ok(unsigned long ptel, unsigned long io_type) { unsigned int wimg = ptel & HPTE_R_WIMG; @@ -140,7 +156,7 @@ static inline int hpte_cache_flags_ok(unsigned long ptel, unsigned long io_type) * Lock and read a linux PTE. If it's present and writable, atomically * set dirty and referenced bits and return the PTE, otherwise return 0. */ -static inline pte_t kvmppc_read_update_linux_pte(pte_t *p) +static inline pte_t kvmppc_read_update_linux_pte(pte_t *p, int writing) { pte_t pte, tmp; @@ -158,7 +174,7 @@ static inline pte_t kvmppc_read_update_linux_pte(pte_t *p) if (pte_present(pte)) { pte = pte_mkyoung(pte); - if (pte_write(pte)) + if (writing && pte_write(pte)) pte = pte_mkdirty(pte); } diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index 83761dd8a92..66d6452c108 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -503,6 +503,7 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, struct page *page, *pages[1]; long index, ret, npages; unsigned long is_io; + unsigned int writing, write_ok; struct vm_area_struct *vma; /* @@ -553,8 +554,11 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, pfn = 0; page = NULL; pte_size = PAGE_SIZE; + writing = (dsisr & DSISR_ISSTORE) != 0; + /* If writing != 0, then the HPTE must allow writing, if we get here */ + write_ok = writing; hva = gfn_to_hva_memslot(memslot, gfn); - npages = get_user_pages_fast(hva, 1, 1, pages); + npages = get_user_pages_fast(hva, 1, writing, pages); if (npages < 1) { /* Check if it's an I/O mapping */ down_read(¤t->mm->mmap_sem); @@ -565,6 +569,7 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, ((hva - vma->vm_start) >> PAGE_SHIFT); pte_size = psize; is_io = hpte_cache_bits(pgprot_val(vma->vm_page_prot)); + write_ok = vma->vm_flags & VM_WRITE; } up_read(¤t->mm->mmap_sem); if (!pfn) @@ -575,6 +580,24 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, page = compound_head(page); pte_size <<= compound_order(page); } + /* if the guest wants write access, see if that is OK */ + if (!writing && hpte_is_writable(r)) { + pte_t *ptep, pte; + + /* + * We need to protect against page table destruction + * while looking up and updating the pte. + */ + rcu_read_lock_sched(); + ptep = find_linux_pte_or_hugepte(current->mm->pgd, + hva, NULL); + if (ptep && pte_present(*ptep)) { + pte = kvmppc_read_update_linux_pte(ptep, 1); + if (pte_write(pte)) + write_ok = 1; + } + rcu_read_unlock_sched(); + } pfn = page_to_pfn(page); } @@ -595,6 +618,8 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, /* Set the HPTE to point to pfn */ r = (r & ~(HPTE_R_PP0 - pte_size)) | (pfn << PAGE_SHIFT); + if (hpte_is_writable(r) && !write_ok) + r = hpte_make_readonly(r); ret = RESUME_GUEST; preempt_disable(); while (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) @@ -614,14 +639,22 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, unlock_rmap(rmap); goto out_unlock; } - kvmppc_add_revmap_chain(kvm, rev, rmap, index, 0); + + if (hptep[0] & HPTE_V_VALID) { + /* HPTE was previously valid, so we need to invalidate it */ + unlock_rmap(rmap); + hptep[0] |= HPTE_V_ABSENT; + kvmppc_invalidate_hpte(kvm, hptep, index); + } else { + kvmppc_add_revmap_chain(kvm, rev, rmap, index, 0); + } hptep[1] = r; eieio(); hptep[0] = hpte[0]; asm volatile("ptesync" : : : "memory"); preempt_enable(); - if (page) + if (page && hpte_is_writable(r)) SetPageDirty(page); out_put: diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c index 81d16ed9767..d3e36fc77e2 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c @@ -120,7 +120,7 @@ static void remove_revmap_chain(struct kvm *kvm, long pte_index, } static pte_t lookup_linux_pte(struct kvm_vcpu *vcpu, unsigned long hva, - unsigned long *pte_sizep) + int writing, unsigned long *pte_sizep) { pte_t *ptep; unsigned long ps = *pte_sizep; @@ -137,7 +137,7 @@ static pte_t lookup_linux_pte(struct kvm_vcpu *vcpu, unsigned long hva, return __pte(0); if (!pte_present(*ptep)) return __pte(0); - return kvmppc_read_update_linux_pte(ptep); + return kvmppc_read_update_linux_pte(ptep, writing); } long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, @@ -154,12 +154,14 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, unsigned long is_io; unsigned long *rmap; pte_t pte; + unsigned int writing; unsigned long mmu_seq; bool realmode = vcpu->arch.vcore->vcore_state == VCORE_RUNNING; psize = hpte_page_size(pteh, ptel); if (!psize) return H_PARAMETER; + writing = hpte_is_writable(ptel); pteh &= ~(HPTE_V_HVLOCK | HPTE_V_ABSENT | HPTE_V_VALID); /* used later to detect if we might have been invalidated */ @@ -208,8 +210,11 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, /* Look up the Linux PTE for the backing page */ pte_size = psize; - pte = lookup_linux_pte(vcpu, hva, &pte_size); + pte = lookup_linux_pte(vcpu, hva, writing, &pte_size); if (pte_present(pte)) { + if (writing && !pte_write(pte)) + /* make the actual HPTE be read-only */ + ptel = hpte_make_readonly(ptel); is_io = hpte_cache_bits(pte_val(pte)); pa = pte_pfn(pte) << PAGE_SHIFT; } @@ -678,7 +683,9 @@ EXPORT_SYMBOL(kvmppc_hv_find_lock_hpte); /* * Called in real mode to check whether an HPTE not found fault - * is due to accessing a paged-out page or an emulated MMIO page. + * is due to accessing a paged-out page or an emulated MMIO page, + * or if a protection fault is due to accessing a page that the + * guest wanted read/write access to but which we made read-only. * Returns a possibly modified status (DSISR) value if not * (i.e. pass the interrupt to the guest), * -1 to pass the fault up to host kernel mode code, -2 to do that @@ -696,12 +703,17 @@ long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr, struct revmap_entry *rev; unsigned long pp, key; - valid = HPTE_V_VALID | HPTE_V_ABSENT; + /* For protection fault, expect to find a valid HPTE */ + valid = HPTE_V_VALID; + if (status & DSISR_NOHPTE) + valid |= HPTE_V_ABSENT; index = kvmppc_hv_find_lock_hpte(kvm, addr, slb_v, valid); - if (index < 0) - return status; /* there really was no HPTE */ - + if (index < 0) { + if (status & DSISR_NOHPTE) + return status; /* there really was no HPTE */ + return 0; /* for prot fault, HPTE disappeared */ + } hpte = (unsigned long *)(kvm->arch.hpt_virt + (index << 4)); v = hpte[0] & ~HPTE_V_HVLOCK; r = hpte[1]; @@ -712,8 +724,8 @@ long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr, asm volatile("lwsync" : : : "memory"); hpte[0] = v; - /* If the HPTE is valid by now, retry the instruction */ - if (v & HPTE_V_VALID) + /* For not found, if the HPTE is valid by now, retry the instruction */ + if ((status & DSISR_NOHPTE) && (v & HPTE_V_VALID)) return 0; /* Check access permissions to the page */ diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S index 7d4990665d0..b70bf22a3ff 100644 --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -1114,8 +1114,8 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201) kvmppc_hdsi: mfspr r4, SPRN_HDAR mfspr r6, SPRN_HDSISR - /* HPTE not found fault? */ - andis. r0, r6, DSISR_NOHPTE@h + /* HPTE not found fault or protection fault? */ + andis. r0, r6, (DSISR_NOHPTE | DSISR_PROTFAULT)@h beq 1f /* if not, send it to the guest */ andi. r0, r11, MSR_DR /* data relocation enabled? */ beq 3f -- cgit v1.2.3 From 03cdab5340b423ec88fc18eb158a62a8a7b94d7f Mon Sep 17 00:00:00 2001 From: Matt Evans Date: Tue, 6 Dec 2011 21:19:42 +0000 Subject: KVM: PPC: Fix vcpu_create dereference before validity check. Fix usage of vcpu struct before check that it's actually valid. Signed-off-by: Matt Evans Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/powerpc.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 06e955b5837..25171037a36 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -289,9 +289,10 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) { struct kvm_vcpu *vcpu; vcpu = kvmppc_core_vcpu_create(kvm, id); - vcpu->arch.wqp = &vcpu->wq; - if (!IS_ERR(vcpu)) + if (!IS_ERR(vcpu)) { + vcpu->arch.wqp = &vcpu->wq; kvmppc_create_vcpu_debugfs(vcpu, id); + } return vcpu; } -- cgit v1.2.3 From b5434032fcfd7490c6453feb397fb781762b6f09 Mon Sep 17 00:00:00 2001 From: Matt Evans Date: Wed, 7 Dec 2011 16:55:57 +0000 Subject: KVM: PPC: Add KVM_CAP_NR_VCPUS and KVM_CAP_MAX_VCPUS PPC KVM lacks these two capabilities, and as such a userland system must assume a max of 4 VCPUs (following api.txt). With these, a userland can determine a more realistic limit. Signed-off-by: Matt Evans Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/powerpc.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 25171037a36..f4380cb264e 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -249,6 +249,22 @@ int kvm_dev_ioctl_check_extension(long ext) r = cpu_has_feature(CPU_FTR_ARCH_206) ? 1 : 0; break; #endif + case KVM_CAP_NR_VCPUS: + /* + * Recommending a number of CPUs is somewhat arbitrary; we + * return the number of present CPUs for -HV (since a host + * will have secondary threads "offline"), and for other KVM + * implementations just count online CPUs. + */ +#ifdef CONFIG_KVM_BOOK3S_64_HV + r = num_present_cpus(); +#else + r = num_online_cpus(); +#endif + break; + case KVM_CAP_MAX_VCPUS: + r = KVM_MAX_VCPUS; + break; default: r = 0; break; -- cgit v1.2.3 From a92bce95f0f967dfa6205527d7143d276b0be6a7 Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Thu, 15 Dec 2011 02:01:10 +0000 Subject: KVM: PPC: Book3S HV: Keep HPTE locked when invalidating This reworks the implementations of the H_REMOVE and H_BULK_REMOVE hcalls to make sure that we keep the HPTE locked and in the reverse- mapping chain until we have finished invalidating it. Previously we would remove it from the chain and unlock it before invalidating it, leaving a tiny window when the guest could access the page even though we believe we have removed it from the guest (e.g., kvm_unmap_hva() has been called for the page and has found no HPTEs in the chain). In addition, we'll need this for future patches where we will need to read the R and C bits in the HPTE after invalidating it. Doing this required restructuring kvmppc_h_bulk_remove() substantially. Since we want to batch up the tlbies, we now need to keep several HPTEs locked simultaneously. In order to avoid possible deadlocks, we don't spin on the HPTE bitlock for any except the first HPTE in a batch. If we can't acquire the HPTE bitlock for the second or subsequent HPTE, we terminate the batch at that point, do the tlbies that we have accumulated so far, unlock those HPTEs, and then start a new batch to do the remaining invalidations. Signed-off-by: Paul Mackerras Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/book3s_hv_rm_mmu.c | 212 +++++++++++++++++++++--------------- 1 file changed, 125 insertions(+), 87 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c index d3e36fc77e2..ba4a1376b33 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c @@ -140,6 +140,12 @@ static pte_t lookup_linux_pte(struct kvm_vcpu *vcpu, unsigned long hva, return kvmppc_read_update_linux_pte(ptep, writing); } +static inline void unlock_hpte(unsigned long *hpte, unsigned long hpte_v) +{ + asm volatile(PPC_RELEASE_BARRIER "" : : : "memory"); + hpte[0] = hpte_v; +} + long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, long pte_index, unsigned long pteh, unsigned long ptel) { @@ -356,6 +362,7 @@ long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags, struct kvm *kvm = vcpu->kvm; unsigned long *hpte; unsigned long v, r, rb; + struct revmap_entry *rev; if (pte_index >= HPT_NPTE) return H_PARAMETER; @@ -368,30 +375,32 @@ long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags, hpte[0] &= ~HPTE_V_HVLOCK; return H_NOT_FOUND; } - if (atomic_read(&kvm->online_vcpus) == 1) - flags |= H_LOCAL; - vcpu->arch.gpr[4] = v = hpte[0] & ~HPTE_V_HVLOCK; - vcpu->arch.gpr[5] = r = hpte[1]; - rb = compute_tlbie_rb(v, r, pte_index); - if (v & HPTE_V_VALID) + + rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); + v = hpte[0] & ~HPTE_V_HVLOCK; + if (v & HPTE_V_VALID) { + hpte[0] &= ~HPTE_V_VALID; + rb = compute_tlbie_rb(v, hpte[1], pte_index); + if (!(flags & H_LOCAL) && atomic_read(&kvm->online_vcpus) > 1) { + while (!try_lock_tlbie(&kvm->arch.tlbie_lock)) + cpu_relax(); + asm volatile("ptesync" : : : "memory"); + asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync" + : : "r" (rb), "r" (kvm->arch.lpid)); + asm volatile("ptesync" : : : "memory"); + kvm->arch.tlbie_lock = 0; + } else { + asm volatile("ptesync" : : : "memory"); + asm volatile("tlbiel %0" : : "r" (rb)); + asm volatile("ptesync" : : : "memory"); + } remove_revmap_chain(kvm, pte_index, v); - smp_wmb(); - hpte[0] = 0; - if (!(v & HPTE_V_VALID)) - return H_SUCCESS; - if (!(flags & H_LOCAL)) { - while (!try_lock_tlbie(&kvm->arch.tlbie_lock)) - cpu_relax(); - asm volatile("ptesync" : : : "memory"); - asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync" - : : "r" (rb), "r" (kvm->arch.lpid)); - asm volatile("ptesync" : : : "memory"); - kvm->arch.tlbie_lock = 0; - } else { - asm volatile("ptesync" : : : "memory"); - asm volatile("tlbiel %0" : : "r" (rb)); - asm volatile("ptesync" : : : "memory"); } + r = rev->guest_rpte; + unlock_hpte(hpte, 0); + + vcpu->arch.gpr[4] = v; + vcpu->arch.gpr[5] = r; return H_SUCCESS; } @@ -399,82 +408,113 @@ long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu) { struct kvm *kvm = vcpu->kvm; unsigned long *args = &vcpu->arch.gpr[4]; - unsigned long *hp, tlbrb[4]; - long int i, found; - long int n_inval = 0; - unsigned long flags, req, pte_index; + unsigned long *hp, *hptes[4], tlbrb[4]; + long int i, j, k, n, found, indexes[4]; + unsigned long flags, req, pte_index, rcbits; long int local = 0; long int ret = H_SUCCESS; + struct revmap_entry *rev, *revs[4]; if (atomic_read(&kvm->online_vcpus) == 1) local = 1; - for (i = 0; i < 4; ++i) { - pte_index = args[i * 2]; - flags = pte_index >> 56; - pte_index &= ((1ul << 56) - 1); - req = flags >> 6; - flags &= 3; - if (req == 3) - break; - if (req != 1 || flags == 3 || - pte_index >= HPT_NPTE) { - /* parameter error */ - args[i * 2] = ((0xa0 | flags) << 56) + pte_index; - ret = H_PARAMETER; - break; - } - hp = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); - while (!try_lock_hpte(hp, HPTE_V_HVLOCK)) - cpu_relax(); - found = 0; - if (hp[0] & (HPTE_V_ABSENT | HPTE_V_VALID)) { - switch (flags & 3) { - case 0: /* absolute */ - found = 1; + for (i = 0; i < 4 && ret == H_SUCCESS; ) { + n = 0; + for (; i < 4; ++i) { + j = i * 2; + pte_index = args[j]; + flags = pte_index >> 56; + pte_index &= ((1ul << 56) - 1); + req = flags >> 6; + flags &= 3; + if (req == 3) { /* no more requests */ + i = 4; break; - case 1: /* andcond */ - if (!(hp[0] & args[i * 2 + 1])) - found = 1; + } + if (req != 1 || flags == 3 || pte_index >= HPT_NPTE) { + /* parameter error */ + args[j] = ((0xa0 | flags) << 56) + pte_index; + ret = H_PARAMETER; break; - case 2: /* AVPN */ - if ((hp[0] & ~0x7fUL) == args[i * 2 + 1]) + } + hp = (unsigned long *) + (kvm->arch.hpt_virt + (pte_index << 4)); + /* to avoid deadlock, don't spin except for first */ + if (!try_lock_hpte(hp, HPTE_V_HVLOCK)) { + if (n) + break; + while (!try_lock_hpte(hp, HPTE_V_HVLOCK)) + cpu_relax(); + } + found = 0; + if (hp[0] & (HPTE_V_ABSENT | HPTE_V_VALID)) { + switch (flags & 3) { + case 0: /* absolute */ found = 1; - break; + break; + case 1: /* andcond */ + if (!(hp[0] & args[j + 1])) + found = 1; + break; + case 2: /* AVPN */ + if ((hp[0] & ~0x7fUL) == args[j + 1]) + found = 1; + break; + } + } + if (!found) { + hp[0] &= ~HPTE_V_HVLOCK; + args[j] = ((0x90 | flags) << 56) + pte_index; + continue; } + + args[j] = ((0x80 | flags) << 56) + pte_index; + rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); + /* insert R and C bits from guest PTE */ + rcbits = rev->guest_rpte & (HPTE_R_R|HPTE_R_C); + args[j] |= rcbits << (56 - 5); + + if (!(hp[0] & HPTE_V_VALID)) + continue; + + hp[0] &= ~HPTE_V_VALID; /* leave it locked */ + tlbrb[n] = compute_tlbie_rb(hp[0], hp[1], pte_index); + indexes[n] = j; + hptes[n] = hp; + revs[n] = rev; + ++n; } - if (!found) { - hp[0] &= ~HPTE_V_HVLOCK; - args[i * 2] = ((0x90 | flags) << 56) + pte_index; - continue; + + if (!n) + break; + + /* Now that we've collected a batch, do the tlbies */ + if (!local) { + while(!try_lock_tlbie(&kvm->arch.tlbie_lock)) + cpu_relax(); + asm volatile("ptesync" : : : "memory"); + for (k = 0; k < n; ++k) + asm volatile(PPC_TLBIE(%1,%0) : : + "r" (tlbrb[k]), + "r" (kvm->arch.lpid)); + asm volatile("eieio; tlbsync; ptesync" : : : "memory"); + kvm->arch.tlbie_lock = 0; + } else { + asm volatile("ptesync" : : : "memory"); + for (k = 0; k < n; ++k) + asm volatile("tlbiel %0" : : "r" (tlbrb[k])); + asm volatile("ptesync" : : : "memory"); } - /* insert R and C bits from PTE */ - flags |= (hp[1] >> 5) & 0x0c; - args[i * 2] = ((0x80 | flags) << 56) + pte_index; - if (hp[0] & HPTE_V_VALID) { - tlbrb[n_inval++] = compute_tlbie_rb(hp[0], hp[1], pte_index); + + for (k = 0; k < n; ++k) { + j = indexes[k]; + pte_index = args[j] & ((1ul << 56) - 1); + hp = hptes[k]; + rev = revs[k]; remove_revmap_chain(kvm, pte_index, hp[0]); + unlock_hpte(hp, 0); } - smp_wmb(); - hp[0] = 0; - } - if (n_inval == 0) - return ret; - - if (!local) { - while(!try_lock_tlbie(&kvm->arch.tlbie_lock)) - cpu_relax(); - asm volatile("ptesync" : : : "memory"); - for (i = 0; i < n_inval; ++i) - asm volatile(PPC_TLBIE(%1,%0) - : : "r" (tlbrb[i]), "r" (kvm->arch.lpid)); - asm volatile("eieio; tlbsync; ptesync" : : : "memory"); - kvm->arch.tlbie_lock = 0; - } else { - asm volatile("ptesync" : : : "memory"); - for (i = 0; i < n_inval; ++i) - asm volatile("tlbiel %0" : : "r" (tlbrb[i])); - asm volatile("ptesync" : : : "memory"); } + return ret; } @@ -720,9 +760,7 @@ long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr, rev = real_vmalloc_addr(&kvm->arch.revmap[index]); gr = rev->guest_rpte; - /* Unlock the HPTE */ - asm volatile("lwsync" : : : "memory"); - hpte[0] = v; + unlock_hpte(hpte, v); /* For not found, if the HPTE is valid by now, retry the instruction */ if ((status & DSISR_NOHPTE) && (v & HPTE_V_VALID)) -- cgit v1.2.3 From bad3b5075eeb18cb1641b4171618add638bc0fa7 Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Thu, 15 Dec 2011 02:02:02 +0000 Subject: KVM: PPC: Book3s HV: Maintain separate guest and host views of R and C bits This allows both the guest and the host to use the referenced (R) and changed (C) bits in the guest hashed page table. The guest has a view of R and C that is maintained in the guest_rpte field of the revmap entry for the HPTE, and the host has a view that is maintained in the rmap entry for the associated gfn. Both view are updated from the guest HPT. If a bit (R or C) is zero in either view, it will be initially set to zero in the HPTE (or HPTEs), until set to 1 by hardware. When an HPTE is removed for any reason, the R and C bits from the HPTE are ORed into both views. We have to be careful to read the R and C bits from the HPTE after invalidating it, but before unlocking it, in case of any late updates by the hardware. Signed-off-by: Paul Mackerras Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_host.h | 5 ++-- arch/powerpc/kvm/book3s_64_mmu_hv.c | 48 +++++++++++++++++++++++-------------- arch/powerpc/kvm/book3s_hv_rm_mmu.c | 45 +++++++++++++++++++--------------- 3 files changed, 59 insertions(+), 39 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 968f3aa61cd..1cb6e522485 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -200,8 +200,9 @@ struct revmap_entry { * index in the guest HPT of a HPTE that points to the page. */ #define KVMPPC_RMAP_LOCK_BIT 63 -#define KVMPPC_RMAP_REF_BIT 33 -#define KVMPPC_RMAP_REFERENCED (1ul << KVMPPC_RMAP_REF_BIT) +#define KVMPPC_RMAP_RC_SHIFT 32 +#define KVMPPC_RMAP_REFERENCED (HPTE_R_R << KVMPPC_RMAP_RC_SHIFT) +#define KVMPPC_RMAP_CHANGED (HPTE_R_C << KVMPPC_RMAP_RC_SHIFT) #define KVMPPC_RMAP_PRESENT 0x100000000ul #define KVMPPC_RMAP_INDEX 0xfffffffful diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index 66d6452c108..aa51ddef468 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -505,6 +505,7 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, unsigned long is_io; unsigned int writing, write_ok; struct vm_area_struct *vma; + unsigned long rcbits; /* * Real-mode code has already searched the HPT and found the @@ -640,11 +641,17 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, goto out_unlock; } + /* Only set R/C in real HPTE if set in both *rmap and guest_rpte */ + rcbits = *rmap >> KVMPPC_RMAP_RC_SHIFT; + r &= rcbits | ~(HPTE_R_R | HPTE_R_C); + if (hptep[0] & HPTE_V_VALID) { /* HPTE was previously valid, so we need to invalidate it */ unlock_rmap(rmap); hptep[0] |= HPTE_V_ABSENT; kvmppc_invalidate_hpte(kvm, hptep, index); + /* don't lose previous R and C bits */ + r |= hptep[1] & (HPTE_R_R | HPTE_R_C); } else { kvmppc_add_revmap_chain(kvm, rev, rmap, index, 0); } @@ -701,50 +708,55 @@ static int kvm_unmap_rmapp(struct kvm *kvm, unsigned long *rmapp, struct revmap_entry *rev = kvm->arch.revmap; unsigned long h, i, j; unsigned long *hptep; - unsigned long ptel, psize; + unsigned long ptel, psize, rcbits; for (;;) { - while (test_and_set_bit_lock(KVMPPC_RMAP_LOCK_BIT, rmapp)) - cpu_relax(); + lock_rmap(rmapp); if (!(*rmapp & KVMPPC_RMAP_PRESENT)) { - __clear_bit_unlock(KVMPPC_RMAP_LOCK_BIT, rmapp); + unlock_rmap(rmapp); break; } /* * To avoid an ABBA deadlock with the HPTE lock bit, - * we have to unlock the rmap chain before locking the HPTE. - * Thus we remove the first entry, unlock the rmap chain, - * lock the HPTE and then check that it is for the - * page we're unmapping before changing it to non-present. + * we can't spin on the HPTE lock while holding the + * rmap chain lock. */ i = *rmapp & KVMPPC_RMAP_INDEX; + hptep = (unsigned long *) (kvm->arch.hpt_virt + (i << 4)); + if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) { + /* unlock rmap before spinning on the HPTE lock */ + unlock_rmap(rmapp); + while (hptep[0] & HPTE_V_HVLOCK) + cpu_relax(); + continue; + } j = rev[i].forw; if (j == i) { /* chain is now empty */ - j = 0; + *rmapp &= ~(KVMPPC_RMAP_PRESENT | KVMPPC_RMAP_INDEX); } else { /* remove i from chain */ h = rev[i].back; rev[h].forw = j; rev[j].back = h; rev[i].forw = rev[i].back = i; - j |= KVMPPC_RMAP_PRESENT; + *rmapp = (*rmapp & ~KVMPPC_RMAP_INDEX) | j; } - smp_wmb(); - *rmapp = j | (1ul << KVMPPC_RMAP_REF_BIT); - /* Now lock, check and modify the HPTE */ - hptep = (unsigned long *) (kvm->arch.hpt_virt + (i << 4)); - while (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) - cpu_relax(); + /* Now check and modify the HPTE */ ptel = rev[i].guest_rpte; psize = hpte_page_size(hptep[0], ptel); if ((hptep[0] & HPTE_V_VALID) && hpte_rpn(ptel, psize) == gfn) { - kvmppc_invalidate_hpte(kvm, hptep, i); hptep[0] |= HPTE_V_ABSENT; + kvmppc_invalidate_hpte(kvm, hptep, i); + /* Harvest R and C */ + rcbits = hptep[1] & (HPTE_R_R | HPTE_R_C); + *rmapp |= rcbits << KVMPPC_RMAP_RC_SHIFT; + rev[i].guest_rpte = ptel | rcbits; } + unlock_rmap(rmapp); hptep[0] &= ~HPTE_V_HVLOCK; } return 0; @@ -767,7 +779,7 @@ static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp, kvm_unmap_rmapp(kvm, rmapp, gfn); while (test_and_set_bit_lock(KVMPPC_RMAP_LOCK_BIT, rmapp)) cpu_relax(); - __clear_bit(KVMPPC_RMAP_REF_BIT, rmapp); + *rmapp &= ~KVMPPC_RMAP_REFERENCED; __clear_bit_unlock(KVMPPC_RMAP_LOCK_BIT, rmapp); return 1; } diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c index ba4a1376b33..91b45a03f43 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c @@ -87,15 +87,17 @@ EXPORT_SYMBOL_GPL(kvmppc_add_revmap_chain); /* Remove this HPTE from the chain for a real page */ static void remove_revmap_chain(struct kvm *kvm, long pte_index, - unsigned long hpte_v) + struct revmap_entry *rev, + unsigned long hpte_v, unsigned long hpte_r) { - struct revmap_entry *rev, *next, *prev; + struct revmap_entry *next, *prev; unsigned long gfn, ptel, head; struct kvm_memory_slot *memslot; unsigned long *rmap; + unsigned long rcbits; - rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); - ptel = rev->guest_rpte; + rcbits = hpte_r & (HPTE_R_R | HPTE_R_C); + ptel = rev->guest_rpte |= rcbits; gfn = hpte_rpn(ptel, hpte_page_size(hpte_v, ptel)); memslot = builtin_gfn_to_memslot(kvm, gfn); if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) @@ -116,6 +118,7 @@ static void remove_revmap_chain(struct kvm *kvm, long pte_index, else *rmap = (*rmap & ~KVMPPC_RMAP_INDEX) | head; } + *rmap |= rcbits << KVMPPC_RMAP_RC_SHIFT; unlock_rmap(rmap); } @@ -162,6 +165,7 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, pte_t pte; unsigned int writing; unsigned long mmu_seq; + unsigned long rcbits; bool realmode = vcpu->arch.vcore->vcore_state == VCORE_RUNNING; psize = hpte_page_size(pteh, ptel); @@ -320,6 +324,9 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, } else { kvmppc_add_revmap_chain(kvm, rev, rmap, pte_index, realmode); + /* Only set R/C in real HPTE if already set in *rmap */ + rcbits = *rmap >> KVMPPC_RMAP_RC_SHIFT; + ptel &= rcbits | ~(HPTE_R_R | HPTE_R_C); } } @@ -394,7 +401,8 @@ long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags, asm volatile("tlbiel %0" : : "r" (rb)); asm volatile("ptesync" : : : "memory"); } - remove_revmap_chain(kvm, pte_index, v); + /* Read PTE low word after tlbie to get final R/C values */ + remove_revmap_chain(kvm, pte_index, rev, v, hpte[1]); } r = rev->guest_rpte; unlock_hpte(hpte, 0); @@ -469,12 +477,13 @@ long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu) args[j] = ((0x80 | flags) << 56) + pte_index; rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); - /* insert R and C bits from guest PTE */ - rcbits = rev->guest_rpte & (HPTE_R_R|HPTE_R_C); - args[j] |= rcbits << (56 - 5); - if (!(hp[0] & HPTE_V_VALID)) + if (!(hp[0] & HPTE_V_VALID)) { + /* insert R and C bits from PTE */ + rcbits = rev->guest_rpte & (HPTE_R_R|HPTE_R_C); + args[j] |= rcbits << (56 - 5); continue; + } hp[0] &= ~HPTE_V_VALID; /* leave it locked */ tlbrb[n] = compute_tlbie_rb(hp[0], hp[1], pte_index); @@ -505,13 +514,16 @@ long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu) asm volatile("ptesync" : : : "memory"); } + /* Read PTE low words after tlbie to get final R/C values */ for (k = 0; k < n; ++k) { j = indexes[k]; pte_index = args[j] & ((1ul << 56) - 1); hp = hptes[k]; rev = revs[k]; - remove_revmap_chain(kvm, pte_index, hp[0]); - unlock_hpte(hp, 0); + remove_revmap_chain(kvm, pte_index, rev, hp[0], hp[1]); + rcbits = rev->guest_rpte & (HPTE_R_R|HPTE_R_C); + args[j] |= rcbits << (56 - 5); + hp[0] = 0; } } @@ -595,8 +607,7 @@ long kvmppc_h_read(struct kvm_vcpu *vcpu, unsigned long flags, pte_index &= ~3; n = 4; } - if (flags & H_R_XLATE) - rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); + rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); for (i = 0; i < n; ++i, ++pte_index) { hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); v = hpte[0] & ~HPTE_V_HVLOCK; @@ -605,12 +616,8 @@ long kvmppc_h_read(struct kvm_vcpu *vcpu, unsigned long flags, v &= ~HPTE_V_ABSENT; v |= HPTE_V_VALID; } - if (v & HPTE_V_VALID) { - if (rev) - r = rev[i].guest_rpte; - else - r = hpte[1] | HPTE_R_RPN; - } + if (v & HPTE_V_VALID) + r = rev[i].guest_rpte | (r & (HPTE_R_R | HPTE_R_C)); vcpu->arch.gpr[4 + i * 2] = v; vcpu->arch.gpr[5 + i * 2] = r; } -- cgit v1.2.3 From 55514893739d28f095f19b012133eea4cb4a9390 Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Thu, 15 Dec 2011 02:02:47 +0000 Subject: KVM: PPC: Book3S HV: Use the hardware referenced bit for kvm_age_hva This uses the host view of the hardware R (referenced) bit to speed up kvm_age_hva() and kvm_test_age_hva(). Instead of removing all the relevant HPTEs in kvm_age_hva(), we now just reset their R bits if set. Also, kvm_test_age_hva() now scans the relevant HPTEs to see if any of them have R set. Signed-off-by: Paul Mackerras Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_book3s.h | 2 + arch/powerpc/kvm/book3s_64_mmu_hv.c | 81 ++++++++++++++++++++++++++++++----- arch/powerpc/kvm/book3s_hv_rm_mmu.c | 19 ++++++++ 3 files changed, 91 insertions(+), 11 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h index 9240cebf8ba..33fdc09508a 100644 --- a/arch/powerpc/include/asm/kvm_book3s.h +++ b/arch/powerpc/include/asm/kvm_book3s.h @@ -147,6 +147,8 @@ extern void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev, unsigned long *rmap, long pte_index, int realmode); extern void kvmppc_invalidate_hpte(struct kvm *kvm, unsigned long *hptep, unsigned long pte_index); +void kvmppc_clear_ref_hpte(struct kvm *kvm, unsigned long *hptep, + unsigned long pte_index); extern void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long addr, unsigned long *nb_ret); extern void kvmppc_unpin_guest_page(struct kvm *kvm, void *addr); diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index aa51ddef468..926e2b92bda 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -772,16 +772,50 @@ int kvm_unmap_hva(struct kvm *kvm, unsigned long hva) static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp, unsigned long gfn) { - if (!kvm->arch.using_mmu_notifiers) - return 0; - if (!(*rmapp & KVMPPC_RMAP_REFERENCED)) - return 0; - kvm_unmap_rmapp(kvm, rmapp, gfn); - while (test_and_set_bit_lock(KVMPPC_RMAP_LOCK_BIT, rmapp)) - cpu_relax(); - *rmapp &= ~KVMPPC_RMAP_REFERENCED; - __clear_bit_unlock(KVMPPC_RMAP_LOCK_BIT, rmapp); - return 1; + struct revmap_entry *rev = kvm->arch.revmap; + unsigned long head, i, j; + unsigned long *hptep; + int ret = 0; + + retry: + lock_rmap(rmapp); + if (*rmapp & KVMPPC_RMAP_REFERENCED) { + *rmapp &= ~KVMPPC_RMAP_REFERENCED; + ret = 1; + } + if (!(*rmapp & KVMPPC_RMAP_PRESENT)) { + unlock_rmap(rmapp); + return ret; + } + + i = head = *rmapp & KVMPPC_RMAP_INDEX; + do { + hptep = (unsigned long *) (kvm->arch.hpt_virt + (i << 4)); + j = rev[i].forw; + + /* If this HPTE isn't referenced, ignore it */ + if (!(hptep[1] & HPTE_R_R)) + continue; + + if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) { + /* unlock rmap before spinning on the HPTE lock */ + unlock_rmap(rmapp); + while (hptep[0] & HPTE_V_HVLOCK) + cpu_relax(); + goto retry; + } + + /* Now check and modify the HPTE */ + if ((hptep[0] & HPTE_V_VALID) && (hptep[1] & HPTE_R_R)) { + kvmppc_clear_ref_hpte(kvm, hptep, i); + rev[i].guest_rpte |= HPTE_R_R; + ret = 1; + } + hptep[0] &= ~HPTE_V_HVLOCK; + } while ((i = j) != head); + + unlock_rmap(rmapp); + return ret; } int kvm_age_hva(struct kvm *kvm, unsigned long hva) @@ -794,7 +828,32 @@ int kvm_age_hva(struct kvm *kvm, unsigned long hva) static int kvm_test_age_rmapp(struct kvm *kvm, unsigned long *rmapp, unsigned long gfn) { - return !!(*rmapp & KVMPPC_RMAP_REFERENCED); + struct revmap_entry *rev = kvm->arch.revmap; + unsigned long head, i, j; + unsigned long *hp; + int ret = 1; + + if (*rmapp & KVMPPC_RMAP_REFERENCED) + return 1; + + lock_rmap(rmapp); + if (*rmapp & KVMPPC_RMAP_REFERENCED) + goto out; + + if (*rmapp & KVMPPC_RMAP_PRESENT) { + i = head = *rmapp & KVMPPC_RMAP_INDEX; + do { + hp = (unsigned long *)(kvm->arch.hpt_virt + (i << 4)); + j = rev[i].forw; + if (hp[1] & HPTE_R_R) + goto out; + } while ((i = j) != head); + } + ret = 0; + + out: + unlock_rmap(rmapp); + return ret; } int kvm_test_age_hva(struct kvm *kvm, unsigned long hva) diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c index 91b45a03f43..5f3c60b89fa 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c @@ -641,6 +641,25 @@ void kvmppc_invalidate_hpte(struct kvm *kvm, unsigned long *hptep, } EXPORT_SYMBOL_GPL(kvmppc_invalidate_hpte); +void kvmppc_clear_ref_hpte(struct kvm *kvm, unsigned long *hptep, + unsigned long pte_index) +{ + unsigned long rb; + unsigned char rbyte; + + rb = compute_tlbie_rb(hptep[0], hptep[1], pte_index); + rbyte = (hptep[1] & ~HPTE_R_R) >> 8; + /* modify only the second-last byte, which contains the ref bit */ + *((char *)hptep + 14) = rbyte; + while (!try_lock_tlbie(&kvm->arch.tlbie_lock)) + cpu_relax(); + asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync" + : : "r" (rb), "r" (kvm->arch.lpid)); + asm volatile("ptesync" : : : "memory"); + kvm->arch.tlbie_lock = 0; +} +EXPORT_SYMBOL_GPL(kvmppc_clear_ref_hpte); + static int slb_base_page_shift[4] = { 24, /* 16M */ 16, /* 64k */ -- cgit v1.2.3 From 82ed36164c8a8ee685ea3fb3c4f741214ac070ca Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Thu, 15 Dec 2011 02:03:22 +0000 Subject: KVM: PPC: Book3s HV: Implement get_dirty_log using hardware changed bit This changes the implementation of kvm_vm_ioctl_get_dirty_log() for Book3s HV guests to use the hardware C (changed) bits in the guest hashed page table. Since this makes the implementation quite different from the Book3s PR case, this moves the existing implementation from book3s.c to book3s_pr.c and creates a new implementation in book3s_hv.c. That implementation calls kvmppc_hv_get_dirty_log() to do the actual work by calling kvm_test_clear_dirty on each page. It iterates over the HPTEs, clearing the C bit if set, and returns 1 if any C bit was set (including the saved C bit in the rmap entry). Signed-off-by: Paul Mackerras Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_book3s.h | 2 + arch/powerpc/kvm/book3s.c | 39 -------------------- arch/powerpc/kvm/book3s_64_mmu_hv.c | 69 +++++++++++++++++++++++++++++++++++ arch/powerpc/kvm/book3s_hv.c | 37 +++++++++++++++++++ arch/powerpc/kvm/book3s_pr.c | 39 ++++++++++++++++++++ 5 files changed, 147 insertions(+), 39 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h index 33fdc09508a..3c3edee672a 100644 --- a/arch/powerpc/include/asm/kvm_book3s.h +++ b/arch/powerpc/include/asm/kvm_book3s.h @@ -156,6 +156,8 @@ extern long kvmppc_virtmode_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, long pte_index, unsigned long pteh, unsigned long ptel); extern long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, long pte_index, unsigned long pteh, unsigned long ptel); +extern long kvmppc_hv_get_dirty_log(struct kvm *kvm, + struct kvm_memory_slot *memslot); extern void kvmppc_entry_trampoline(void); extern void kvmppc_hv_entry_trampoline(void); diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c index 6bf7e0582c5..7d54f4ed6d9 100644 --- a/arch/powerpc/kvm/book3s.c +++ b/arch/powerpc/kvm/book3s.c @@ -477,45 +477,6 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, return 0; } -/* - * Get (and clear) the dirty memory log for a memory slot. - */ -int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, - struct kvm_dirty_log *log) -{ - struct kvm_memory_slot *memslot; - struct kvm_vcpu *vcpu; - ulong ga, ga_end; - int is_dirty = 0; - int r; - unsigned long n; - - mutex_lock(&kvm->slots_lock); - - r = kvm_get_dirty_log(kvm, log, &is_dirty); - if (r) - goto out; - - /* If nothing is dirty, don't bother messing with page tables. */ - if (is_dirty) { - memslot = id_to_memslot(kvm->memslots, log->slot); - - ga = memslot->base_gfn << PAGE_SHIFT; - ga_end = ga + (memslot->npages << PAGE_SHIFT); - - kvm_for_each_vcpu(n, vcpu, kvm) - kvmppc_mmu_pte_pflush(vcpu, ga, ga_end); - - n = kvm_dirty_bitmap_bytes(memslot); - memset(memslot->dirty_bitmap, 0, n); - } - - r = 0; -out: - mutex_unlock(&kvm->slots_lock); - return r; -} - void kvmppc_decrementer_func(unsigned long data) { struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data; diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index 926e2b92bda..783cd3510c9 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -870,6 +870,75 @@ void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte) kvm_handle_hva(kvm, hva, kvm_unmap_rmapp); } +static int kvm_test_clear_dirty(struct kvm *kvm, unsigned long *rmapp) +{ + struct revmap_entry *rev = kvm->arch.revmap; + unsigned long head, i, j; + unsigned long *hptep; + int ret = 0; + + retry: + lock_rmap(rmapp); + if (*rmapp & KVMPPC_RMAP_CHANGED) { + *rmapp &= ~KVMPPC_RMAP_CHANGED; + ret = 1; + } + if (!(*rmapp & KVMPPC_RMAP_PRESENT)) { + unlock_rmap(rmapp); + return ret; + } + + i = head = *rmapp & KVMPPC_RMAP_INDEX; + do { + hptep = (unsigned long *) (kvm->arch.hpt_virt + (i << 4)); + j = rev[i].forw; + + if (!(hptep[1] & HPTE_R_C)) + continue; + + if (!try_lock_hpte(hptep, HPTE_V_HVLOCK)) { + /* unlock rmap before spinning on the HPTE lock */ + unlock_rmap(rmapp); + while (hptep[0] & HPTE_V_HVLOCK) + cpu_relax(); + goto retry; + } + + /* Now check and modify the HPTE */ + if ((hptep[0] & HPTE_V_VALID) && (hptep[1] & HPTE_R_C)) { + /* need to make it temporarily absent to clear C */ + hptep[0] |= HPTE_V_ABSENT; + kvmppc_invalidate_hpte(kvm, hptep, i); + hptep[1] &= ~HPTE_R_C; + eieio(); + hptep[0] = (hptep[0] & ~HPTE_V_ABSENT) | HPTE_V_VALID; + rev[i].guest_rpte |= HPTE_R_C; + ret = 1; + } + hptep[0] &= ~HPTE_V_HVLOCK; + } while ((i = j) != head); + + unlock_rmap(rmapp); + return ret; +} + +long kvmppc_hv_get_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot) +{ + unsigned long i; + unsigned long *rmapp, *map; + + preempt_disable(); + rmapp = memslot->rmap; + map = memslot->dirty_bitmap; + for (i = 0; i < memslot->npages; ++i) { + if (kvm_test_clear_dirty(kvm, rmapp)) + __set_bit_le(i, map); + ++rmapp; + } + preempt_enable(); + return 0; +} + void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa, unsigned long *nb_ret) { diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 86c4191cb75..0f1ddf0ec03 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -1072,6 +1072,43 @@ long kvm_vm_ioctl_allocate_rma(struct kvm *kvm, struct kvm_allocate_rma *ret) return fd; } +/* + * Get (and clear) the dirty memory log for a memory slot. + */ +int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) +{ + struct kvm_memory_slot *memslot; + int r; + unsigned long n; + + mutex_lock(&kvm->slots_lock); + + r = -EINVAL; + if (log->slot >= KVM_MEMORY_SLOTS) + goto out; + + memslot = id_to_memslot(kvm->memslots, log->slot); + r = -ENOENT; + if (!memslot->dirty_bitmap) + goto out; + + n = kvm_dirty_bitmap_bytes(memslot); + memset(memslot->dirty_bitmap, 0, n); + + r = kvmppc_hv_get_dirty_log(kvm, memslot); + if (r) + goto out; + + r = -EFAULT; + if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) + goto out; + + r = 0; +out: + mutex_unlock(&kvm->slots_lock); + return r; +} + static unsigned long slb_pgsize_encoding(unsigned long psize) { unsigned long senc = 0; diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index 2da67040572..c193625d528 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -1056,6 +1056,45 @@ out: return ret; } +/* + * Get (and clear) the dirty memory log for a memory slot. + */ +int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, + struct kvm_dirty_log *log) +{ + struct kvm_memory_slot *memslot; + struct kvm_vcpu *vcpu; + ulong ga, ga_end; + int is_dirty = 0; + int r; + unsigned long n; + + mutex_lock(&kvm->slots_lock); + + r = kvm_get_dirty_log(kvm, log, &is_dirty); + if (r) + goto out; + + /* If nothing is dirty, don't bother messing with page tables. */ + if (is_dirty) { + memslot = id_to_memslot(kvm->memslots, log->slot); + + ga = memslot->base_gfn << PAGE_SHIFT; + ga_end = ga + (memslot->npages << PAGE_SHIFT); + + kvm_for_each_vcpu(n, vcpu, kvm) + kvmppc_mmu_pte_pflush(vcpu, ga, ga_end); + + n = kvm_dirty_bitmap_bytes(memslot); + memset(memslot->dirty_bitmap, 0, n); + } + + r = 0; +out: + mutex_unlock(&kvm->slots_lock); + return r; +} + int kvmppc_core_prepare_memory_region(struct kvm *kvm, struct kvm_userspace_memory_region *mem) { -- cgit v1.2.3 From d37b1a037cae725e69e5bf96f58544b69d7c93a6 Mon Sep 17 00:00:00 2001 From: Liu Yu Date: Tue, 20 Dec 2011 14:42:56 +0000 Subject: KVM: PPC: booke: Add booke206 TLB trace The existing kvm_stlb_write/kvm_gtlb_write were a poor match for the e500/book3e MMU -- mas1 was passed as "tid", mas2 was limited to "unsigned int" which will be a problem on 64-bit, mas3/7 got split up rather than treated as a single 64-bit word, etc. Signed-off-by: Liu Yu [scottwood@freescale.com: made mas2 64-bit, and added mas8 init] Signed-off-by: Scott Wood Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/e500_tlb.c | 10 ++++---- arch/powerpc/kvm/trace.h | 57 +++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 63 insertions(+), 4 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/e500_tlb.c b/arch/powerpc/kvm/e500_tlb.c index 1746e677bf3..6e53e4164de 100644 --- a/arch/powerpc/kvm/e500_tlb.c +++ b/arch/powerpc/kvm/e500_tlb.c @@ -294,6 +294,9 @@ static inline void __write_host_tlbe(struct kvm_book3e_206_tlb_entry *stlbe, mtspr(SPRN_MAS7, (u32)(stlbe->mas7_3 >> 32)); asm volatile("isync; tlbwe" : : : "memory"); local_irq_restore(flags); + + trace_kvm_booke206_stlb_write(mas0, stlbe->mas8, stlbe->mas1, + stlbe->mas2, stlbe->mas7_3); } /* @@ -332,8 +335,6 @@ static inline void write_host_tlbe(struct kvmppc_vcpu_e500 *vcpu_e500, MAS0_TLBSEL(1) | MAS0_ESEL(to_htlb1_esel(sesel))); } - trace_kvm_stlb_write(index_of(tlbsel, esel), stlbe->mas1, stlbe->mas2, - (u32)stlbe->mas7_3, (u32)(stlbe->mas7_3 >> 32)); } void kvmppc_map_magic(struct kvm_vcpu *vcpu) @@ -355,6 +356,7 @@ void kvmppc_map_magic(struct kvm_vcpu *vcpu) magic.mas2 = vcpu->arch.magic_page_ea | MAS2_M; magic.mas7_3 = ((u64)pfn << PAGE_SHIFT) | MAS3_SW | MAS3_SR | MAS3_UW | MAS3_UR; + magic.mas8 = 0; __write_host_tlbe(&magic, MAS0_TLBSEL(1) | MAS0_ESEL(tlbcam_index)); preempt_enable(); @@ -954,8 +956,8 @@ int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu) gtlbe->mas2 = vcpu->arch.shared->mas2; gtlbe->mas7_3 = vcpu->arch.shared->mas7_3; - trace_kvm_gtlb_write(vcpu->arch.shared->mas0, gtlbe->mas1, gtlbe->mas2, - (u32)gtlbe->mas7_3, (u32)(gtlbe->mas7_3 >> 32)); + trace_kvm_booke206_gtlb_write(vcpu->arch.shared->mas0, gtlbe->mas1, + gtlbe->mas2, gtlbe->mas7_3); /* Invalidate shadow mappings for the about-to-be-clobbered TLBE. */ if (tlbe_is_host_safe(vcpu, gtlbe)) { diff --git a/arch/powerpc/kvm/trace.h b/arch/powerpc/kvm/trace.h index 609d8bfb54e..877186b7b1c 100644 --- a/arch/powerpc/kvm/trace.h +++ b/arch/powerpc/kvm/trace.h @@ -340,6 +340,63 @@ TRACE_EVENT(kvm_book3s_slbmte, #endif /* CONFIG_PPC_BOOK3S */ + +/************************************************************************* + * Book3E trace points * + *************************************************************************/ + +#ifdef CONFIG_BOOKE + +TRACE_EVENT(kvm_booke206_stlb_write, + TP_PROTO(__u32 mas0, __u32 mas8, __u32 mas1, __u64 mas2, __u64 mas7_3), + TP_ARGS(mas0, mas8, mas1, mas2, mas7_3), + + TP_STRUCT__entry( + __field( __u32, mas0 ) + __field( __u32, mas8 ) + __field( __u32, mas1 ) + __field( __u64, mas2 ) + __field( __u64, mas7_3 ) + ), + + TP_fast_assign( + __entry->mas0 = mas0; + __entry->mas8 = mas8; + __entry->mas1 = mas1; + __entry->mas2 = mas2; + __entry->mas7_3 = mas7_3; + ), + + TP_printk("mas0=%x mas8=%x mas1=%x mas2=%llx mas7_3=%llx", + __entry->mas0, __entry->mas8, __entry->mas1, + __entry->mas2, __entry->mas7_3) +); + +TRACE_EVENT(kvm_booke206_gtlb_write, + TP_PROTO(__u32 mas0, __u32 mas1, __u64 mas2, __u64 mas7_3), + TP_ARGS(mas0, mas1, mas2, mas7_3), + + TP_STRUCT__entry( + __field( __u32, mas0 ) + __field( __u32, mas1 ) + __field( __u64, mas2 ) + __field( __u64, mas7_3 ) + ), + + TP_fast_assign( + __entry->mas0 = mas0; + __entry->mas1 = mas1; + __entry->mas2 = mas2; + __entry->mas7_3 = mas7_3; + ), + + TP_printk("mas0=%x mas1=%x mas2=%llx mas7_3=%llx", + __entry->mas0, __entry->mas1, + __entry->mas2, __entry->mas7_3) +); + +#endif + #endif /* _TRACE_KVM_H */ /* This part must be outside protection */ -- cgit v1.2.3 From 6b75e6bfef7ba108ac3df0d430d80dea68fde4bf Mon Sep 17 00:00:00 2001 From: Sasha Levin Date: Wed, 7 Dec 2011 10:24:56 +0200 Subject: KVM: PPC: Use the vcpu kmem_cache when allocating new VCPUs Currently the code kzalloc()s new VCPUs instead of using the kmem_cache which is created when KVM is initialized. Modify it to allocate VCPUs from that kmem_cache. Signed-off-by: Sasha Levin Acked-by: Paul Mackerras Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/book3s_hv.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 0f1ddf0ec03..fdc804c8393 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -417,7 +417,7 @@ struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id) goto out; err = -ENOMEM; - vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL); + vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); if (!vcpu) goto out; @@ -469,7 +469,7 @@ struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id) return vcpu; free_vcpu: - kfree(vcpu); + kmem_cache_free(kvm_vcpu_cache, vcpu); out: return ERR_PTR(err); } @@ -483,7 +483,7 @@ void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu) if (vcpu->arch.vpa) kvmppc_unpin_guest_page(vcpu->kvm, vcpu->arch.vpa); kvm_vcpu_uninit(vcpu); - kfree(vcpu); + kmem_cache_free(kvm_vcpu_cache, vcpu); } static void kvmppc_set_timer(struct kvm_vcpu *vcpu) -- cgit v1.2.3 From e24ed81fedd551e80378be62fa0b0532480ea7d4 Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Wed, 14 Sep 2011 10:02:41 +0200 Subject: KVM: PPC: Add generic single register ioctls Right now we transfer a static struct every time we want to get or set registers. Unfortunately, over time we realize that there are more of these than we thought of before and the extensibility and flexibility of transferring a full struct every time is limited. So this is a new approach to the problem. With these new ioctls, we can get and set a single register that is identified by an ID. This allows for very precise and limited transmittal of data. When we later realize that it's a better idea to shove over multiple registers at once, we can reuse most of the infrastructure and simply implement a GET_MANY_REGS / SET_MANY_REGS interface. Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/powerpc.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index f4380cb264e..089c61bf0e1 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -217,6 +217,7 @@ int kvm_dev_ioctl_check_extension(long ext) case KVM_CAP_PPC_UNSET_IRQ: case KVM_CAP_PPC_IRQ_LEVEL: case KVM_CAP_ENABLE_CAP: + case KVM_CAP_ONE_REG: r = 1; break; #ifndef CONFIG_KVM_BOOK3S_64_HV @@ -645,6 +646,32 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, return r; } +static int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, + struct kvm_one_reg *reg) +{ + int r = -EINVAL; + + switch (reg->id) { + default: + break; + } + + return r; +} + +static int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, + struct kvm_one_reg *reg) +{ + int r = -EINVAL; + + switch (reg->id) { + default: + break; + } + + return r; +} + int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, struct kvm_mp_state *mp_state) { @@ -684,6 +711,20 @@ long kvm_arch_vcpu_ioctl(struct file *filp, break; } + case KVM_SET_ONE_REG: + case KVM_GET_ONE_REG: + { + struct kvm_one_reg reg; + r = -EFAULT; + if (copy_from_user(®, argp, sizeof(reg))) + goto out; + if (ioctl == KVM_SET_ONE_REG) + r = kvm_vcpu_ioctl_set_one_reg(vcpu, ®); + else + r = kvm_vcpu_ioctl_get_one_reg(vcpu, ®); + break; + } + #ifdef CONFIG_KVM_E500 case KVM_DIRTY_TLB: { struct kvm_dirty_tlb dirty; -- cgit v1.2.3 From 1022fc3d3bfaca09d5d6bfcc93a168de16840814 Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Wed, 14 Sep 2011 21:45:23 +0200 Subject: KVM: PPC: Add support for explicit HIOR setting Until now, we always set HIOR based on the PVR, but this is just wrong. Instead, we should be setting HIOR explicitly, so user space can decide what the initial HIOR value is - just like on real hardware. We keep the old PVR based way around for backwards compatibility, but once user space uses the SET_ONE_REG based method, we drop the PVR logic. Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm.h | 2 ++ arch/powerpc/include/asm/kvm_book3s.h | 2 ++ arch/powerpc/kvm/book3s_pr.c | 6 ++++-- arch/powerpc/kvm/powerpc.c | 13 +++++++++++++ 4 files changed, 21 insertions(+), 2 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm.h b/arch/powerpc/include/asm/kvm.h index 663c57f8716..f41adcda146 100644 --- a/arch/powerpc/include/asm/kvm.h +++ b/arch/powerpc/include/asm/kvm.h @@ -331,4 +331,6 @@ struct kvm_book3e_206_tlb_params { __u32 reserved[8]; }; +#define KVM_REG_PPC_HIOR (KVM_REG_PPC | KVM_REG_SIZE_U64 | 0x1) + #endif /* __LINUX_KVM_POWERPC_H */ diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h index 3c3edee672a..aa795ccef29 100644 --- a/arch/powerpc/include/asm/kvm_book3s.h +++ b/arch/powerpc/include/asm/kvm_book3s.h @@ -90,6 +90,8 @@ struct kvmppc_vcpu_book3s { #endif int context_id[SID_CONTEXTS]; + bool hior_explicit; /* HIOR is set by ioctl, not PVR */ + struct hlist_head hpte_hash_pte[HPTEG_HASH_NUM_PTE]; struct hlist_head hpte_hash_pte_long[HPTEG_HASH_NUM_PTE_LONG]; struct hlist_head hpte_hash_vpte[HPTEG_HASH_NUM_VPTE]; diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index c193625d528..00efda6dc0e 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -157,14 +157,16 @@ void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr) #ifdef CONFIG_PPC_BOOK3S_64 if ((pvr >= 0x330000) && (pvr < 0x70330000)) { kvmppc_mmu_book3s_64_init(vcpu); - to_book3s(vcpu)->hior = 0xfff00000; + if (!to_book3s(vcpu)->hior_explicit) + to_book3s(vcpu)->hior = 0xfff00000; to_book3s(vcpu)->msr_mask = 0xffffffffffffffffULL; vcpu->arch.cpu_type = KVM_CPU_3S_64; } else #endif { kvmppc_mmu_book3s_32_init(vcpu); - to_book3s(vcpu)->hior = 0; + if (!to_book3s(vcpu)->hior_explicit) + to_book3s(vcpu)->hior = 0; to_book3s(vcpu)->msr_mask = 0xffffffffULL; vcpu->arch.cpu_type = KVM_CPU_3S_32; } diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 089c61bf0e1..59852091b38 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -212,6 +212,7 @@ int kvm_dev_ioctl_check_extension(long ext) case KVM_CAP_PPC_BOOKE_SREGS: #else case KVM_CAP_PPC_SEGSTATE: + case KVM_CAP_PPC_HIOR: case KVM_CAP_PPC_PAPR: #endif case KVM_CAP_PPC_UNSET_IRQ: @@ -652,6 +653,11 @@ static int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, int r = -EINVAL; switch (reg->id) { +#ifdef CONFIG_PPC_BOOK3S + case KVM_REG_PPC_HIOR: + r = put_user(to_book3s(vcpu)->hior, (u64 __user *)reg->addr); + break; +#endif default: break; } @@ -665,6 +671,13 @@ static int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, int r = -EINVAL; switch (reg->id) { +#ifdef CONFIG_PPC_BOOK3S + case KVM_ONE_REG_PPC_HIOR: + r = get_user(to_book3s(vcpu)->hior, (u64 __user *)reg->addr); + if (!r) + to_book3s(vcpu)->hior_explicit = true; + break; +#endif default: break; } -- cgit v1.2.3 From 31f3438eca2fc90dc892e0e9963ba4b93a2c8383 Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Mon, 12 Dec 2011 12:26:50 +0000 Subject: KVM: PPC: Move kvm_vcpu_ioctl_[gs]et_one_reg down to platform-specific code This moves the get/set_one_reg implementation down from powerpc.c into booke.c, book3s_pr.c and book3s_hv.c. This avoids #ifdefs in C code, but more importantly, it fixes a bug on Book3s HV where we were accessing beyond the end of the kvm_vcpu struct (via the to_book3s() macro) and corrupting memory, causing random crashes and file corruption. On Book3s HV we only accept setting the HIOR to zero, since the guest runs in supervisor mode and its vectors are never offset from zero. Signed-off-by: Paul Mackerras Signed-off-by: Alexander Graf [agraf update to apply on top of changed ONE_REG patches] Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_ppc.h | 3 +++ arch/powerpc/kvm/book3s_hv.c | 36 ++++++++++++++++++++++++++++++++++++ arch/powerpc/kvm/book3s_pr.c | 32 ++++++++++++++++++++++++++++++++ arch/powerpc/kvm/booke.c | 10 ++++++++++ arch/powerpc/kvm/powerpc.c | 38 -------------------------------------- 5 files changed, 81 insertions(+), 38 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h index fb70414db90..a61b5b5047d 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -176,6 +176,9 @@ int kvmppc_core_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs); void kvmppc_get_sregs_ivor(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs); int kvmppc_set_sregs_ivor(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs); +int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg); +int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg); + void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 pid); #ifdef CONFIG_KVM_BOOK3S_64_HV diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index fdc804c8393..3580db8a232 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -398,6 +398,42 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, return 0; } +int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg) +{ + int r = -EINVAL; + + switch (reg->id) { + case KVM_REG_PPC_HIOR: + r = put_user(0, (u64 __user *)reg->addr); + break; + default: + break; + } + + return r; +} + +int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg) +{ + int r = -EINVAL; + + switch (reg->id) { + case KVM_REG_PPC_HIOR: + { + u64 hior; + /* Only allow this to be set to zero */ + r = get_user(hior, (u64 __user *)reg->addr); + if (!r && (hior != 0)) + r = -EINVAL; + break; + } + default: + break; + } + + return r; +} + int kvmppc_core_check_processor_compat(void) { if (cpu_has_feature(CPU_FTR_HVMODE)) diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index 00efda6dc0e..ee222ec7c95 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -874,6 +874,38 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, return 0; } +int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg) +{ + int r = -EINVAL; + + switch (reg->id) { + case KVM_REG_PPC_HIOR: + r = put_user(to_book3s(vcpu)->hior, (u64 __user *)reg->addr); + break; + default: + break; + } + + return r; +} + +int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg) +{ + int r = -EINVAL; + + switch (reg->id) { + case KVM_REG_PPC_HIOR: + r = get_user(to_book3s(vcpu)->hior, (u64 __user *)reg->addr); + if (!r) + to_book3s(vcpu)->hior_explicit = true; + break; + default: + break; + } + + return r; +} + int kvmppc_core_check_processor_compat(void) { return 0; diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index 9e41f45d07e..ee9e1ee9c85 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -887,6 +887,16 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, return kvmppc_core_set_sregs(vcpu, sregs); } +int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg) +{ + return -EINVAL; +} + +int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg) +{ + return -EINVAL; +} + int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) { return -ENOTSUPP; diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 59852091b38..e23270779ff 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -647,44 +647,6 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, return r; } -static int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, - struct kvm_one_reg *reg) -{ - int r = -EINVAL; - - switch (reg->id) { -#ifdef CONFIG_PPC_BOOK3S - case KVM_REG_PPC_HIOR: - r = put_user(to_book3s(vcpu)->hior, (u64 __user *)reg->addr); - break; -#endif - default: - break; - } - - return r; -} - -static int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, - struct kvm_one_reg *reg) -{ - int r = -EINVAL; - - switch (reg->id) { -#ifdef CONFIG_PPC_BOOK3S - case KVM_ONE_REG_PPC_HIOR: - r = get_user(to_book3s(vcpu)->hior, (u64 __user *)reg->addr); - if (!r) - to_book3s(vcpu)->hior_explicit = true; - break; -#endif - default: - break; - } - - return r; -} - int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, struct kvm_mp_state *mp_state) { -- cgit v1.2.3 From b3c5d3c2a49602c370de6d02fdb923bc48cd1abc Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Sat, 7 Jan 2012 02:07:38 +0100 Subject: KVM: PPC: Rename MMIO register identifiers We need the KVM_REG namespace for generic register settings now, so let's rename the existing users to something different, enabling us to reuse the namespace for more visible interfaces. While at it, also move these private constants to a private header. Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm.h | 7 ------- arch/powerpc/include/asm/kvm_host.h | 8 ++++++++ arch/powerpc/kvm/book3s_paired_singles.c | 9 ++++++--- arch/powerpc/kvm/powerpc.c | 18 +++++++++--------- 4 files changed, 23 insertions(+), 19 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm.h b/arch/powerpc/include/asm/kvm.h index f41adcda146..b921c3f4892 100644 --- a/arch/powerpc/include/asm/kvm.h +++ b/arch/powerpc/include/asm/kvm.h @@ -269,13 +269,6 @@ struct kvm_guest_debug_arch { struct kvm_sync_regs { }; -#define KVM_REG_MASK 0x001f -#define KVM_REG_EXT_MASK 0xffe0 -#define KVM_REG_GPR 0x0000 -#define KVM_REG_FPR 0x0020 -#define KVM_REG_QPR 0x0040 -#define KVM_REG_FQPR 0x0060 - #define KVM_INTERRUPT_SET -1U #define KVM_INTERRUPT_UNSET -2U #define KVM_INTERRUPT_SET_LEVEL -3U diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 1cb6e522485..af438b1e8a3 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -485,4 +485,12 @@ struct kvm_vcpu_arch { #define KVMPPC_VCPU_BUSY_IN_HOST 1 #define KVMPPC_VCPU_RUNNABLE 2 +/* Values for vcpu->arch.io_gpr */ +#define KVM_MMIO_REG_MASK 0x001f +#define KVM_MMIO_REG_EXT_MASK 0xffe0 +#define KVM_MMIO_REG_GPR 0x0000 +#define KVM_MMIO_REG_FPR 0x0020 +#define KVM_MMIO_REG_QPR 0x0040 +#define KVM_MMIO_REG_FQPR 0x0060 + #endif /* __POWERPC_KVM_HOST_H__ */ diff --git a/arch/powerpc/kvm/book3s_paired_singles.c b/arch/powerpc/kvm/book3s_paired_singles.c index 7b0ee96c1be..e70ef2d8643 100644 --- a/arch/powerpc/kvm/book3s_paired_singles.c +++ b/arch/powerpc/kvm/book3s_paired_singles.c @@ -196,7 +196,8 @@ static int kvmppc_emulate_fpr_load(struct kvm_run *run, struct kvm_vcpu *vcpu, kvmppc_inject_pf(vcpu, addr, false); goto done_load; } else if (r == EMULATE_DO_MMIO) { - emulated = kvmppc_handle_load(run, vcpu, KVM_REG_FPR | rs, len, 1); + emulated = kvmppc_handle_load(run, vcpu, KVM_MMIO_REG_FPR | rs, + len, 1); goto done_load; } @@ -286,11 +287,13 @@ static int kvmppc_emulate_psq_load(struct kvm_run *run, struct kvm_vcpu *vcpu, kvmppc_inject_pf(vcpu, addr, false); goto done_load; } else if ((r == EMULATE_DO_MMIO) && w) { - emulated = kvmppc_handle_load(run, vcpu, KVM_REG_FPR | rs, 4, 1); + emulated = kvmppc_handle_load(run, vcpu, KVM_MMIO_REG_FPR | rs, + 4, 1); vcpu->arch.qpr[rs] = tmp[1]; goto done_load; } else if (r == EMULATE_DO_MMIO) { - emulated = kvmppc_handle_load(run, vcpu, KVM_REG_FQPR | rs, 8, 1); + emulated = kvmppc_handle_load(run, vcpu, KVM_MMIO_REG_FQPR | rs, + 8, 1); goto done_load; } diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index e23270779ff..0e21d155eea 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -448,20 +448,20 @@ static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu, kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr); - switch (vcpu->arch.io_gpr & KVM_REG_EXT_MASK) { - case KVM_REG_GPR: + switch (vcpu->arch.io_gpr & KVM_MMIO_REG_EXT_MASK) { + case KVM_MMIO_REG_GPR: kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr); break; - case KVM_REG_FPR: - vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr; + case KVM_MMIO_REG_FPR: + vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr; break; #ifdef CONFIG_PPC_BOOK3S - case KVM_REG_QPR: - vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr; + case KVM_MMIO_REG_QPR: + vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr; break; - case KVM_REG_FQPR: - vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr; - vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr; + case KVM_MMIO_REG_FQPR: + vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr; + vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr; break; #endif default: -- cgit v1.2.3 From 54f65795c8f6e192540756085d738e66ab0917a0 Mon Sep 17 00:00:00 2001 From: Scott Wood Date: Wed, 11 Jan 2012 13:37:35 +0000 Subject: KVM: PPC: refer to paravirt docs in header file Instead of keeping separate copies of struct kvm_vcpu_arch_shared (one in the code, one in the docs) that inevitably fail to be kept in sync (already sr[] is missing from the doc version), just point to the header file as the source of documentation on the contents of the magic page. Signed-off-by: Scott Wood Acked-by: Avi Kivity Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_para.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_para.h b/arch/powerpc/include/asm/kvm_para.h index ece70fb3651..7b754e74300 100644 --- a/arch/powerpc/include/asm/kvm_para.h +++ b/arch/powerpc/include/asm/kvm_para.h @@ -22,6 +22,16 @@ #include +/* + * Additions to this struct must only occur at the end, and should be + * accompanied by a KVM_MAGIC_FEAT flag to advertise that they are present + * (albeit not necessarily relevant to the current target hardware platform). + * + * Struct fields are always 32 or 64 bit aligned, depending on them being 32 + * or 64 bit wide respectively. + * + * See Documentation/virtual/kvm/ppc-pv.txt + */ struct kvm_vcpu_arch_shared { __u64 scratch1; __u64 scratch2; -- cgit v1.2.3 From 9d4cba7f93c52d4121ab9c6f289e582d368a6979 Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Thu, 12 Jan 2012 20:09:51 +0000 Subject: KVM: Move gfn_to_memslot() to kvm_host.h This moves __gfn_to_memslot() and search_memslots() from kvm_main.c to kvm_host.h to reduce the code duplication caused by the need for non-modular code in arch/powerpc/kvm/book3s_hv_rm_mmu.c to call gfn_to_memslot() in real mode. Rather than putting gfn_to_memslot() itself in a header, which would lead to increased code size, this puts __gfn_to_memslot() in a header. Then, the non-modular uses of gfn_to_memslot() are changed to call __gfn_to_memslot() instead. This way there is only one place in the source code that needs to be changed should the gfn_to_memslot() implementation need to be modified. On powerpc, the Book3S HV style of KVM has code that is called from real mode which needs to call gfn_to_memslot() and thus needs this. (Module code is allocated in the vmalloc region, which can't be accessed in real mode.) With this, we can remove builtin_gfn_to_memslot() from book3s_hv_rm_mmu.c. Signed-off-by: Paul Mackerras Acked-by: Avi Kivity Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/book3s_hv_rm_mmu.c | 23 ++--------------------- 1 file changed, 2 insertions(+), 21 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c index 5f3c60b89fa..def880aea63 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c @@ -21,25 +21,6 @@ #include #include -/* - * Since this file is built in even if KVM is a module, we need - * a local copy of this function for the case where kvm_main.c is - * modular. - */ -static struct kvm_memory_slot *builtin_gfn_to_memslot(struct kvm *kvm, - gfn_t gfn) -{ - struct kvm_memslots *slots; - struct kvm_memory_slot *memslot; - - slots = kvm_memslots(kvm); - kvm_for_each_memslot(memslot, slots) - if (gfn >= memslot->base_gfn && - gfn < memslot->base_gfn + memslot->npages) - return memslot; - return NULL; -} - /* Translate address of a vmalloc'd thing to a linear map address */ static void *real_vmalloc_addr(void *x) { @@ -99,7 +80,7 @@ static void remove_revmap_chain(struct kvm *kvm, long pte_index, rcbits = hpte_r & (HPTE_R_R | HPTE_R_C); ptel = rev->guest_rpte |= rcbits; gfn = hpte_rpn(ptel, hpte_page_size(hpte_v, ptel)); - memslot = builtin_gfn_to_memslot(kvm, gfn); + memslot = __gfn_to_memslot(kvm_memslots(kvm), gfn); if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) return; @@ -181,7 +162,7 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, /* Find the memslot (if any) for this address */ gpa = (ptel & HPTE_R_RPN) & ~(psize - 1); gfn = gpa >> PAGE_SHIFT; - memslot = builtin_gfn_to_memslot(kvm, gfn); + memslot = __gfn_to_memslot(kvm_memslots(kvm), gfn); pa = 0; is_io = ~0ul; rmap = NULL; -- cgit v1.2.3 From 9cf7c0e465197fa97972428e93162318e917f8ed Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Thu, 19 Jan 2012 00:23:46 +0100 Subject: KVM: PPC: E500: Fail init when not on e500v2 When enabling the current KVM code on e500mc, I get the following oops: Oops: Exception in kernel mode, sig: 4 [#1] SMP NR_CPUS=8 P2041 RDB Modules linked in: NIP: c067df4c LR: c067df44 CTR: 00000000 REGS: ee055ed0 TRAP: 0700 Not tainted (3.2.0-10391-g36c5afe) MSR: 00029002 CR: 24042022 XER: 00000000 TASK = ee0429b0[1] 'swapper/0' THREAD: ee054000 CPU: 2 GPR00: c067df44 ee055f80 ee0429b0 00000000 00000058 0000003f ee211600 60c6b864 GPR08: 7cc903a6 0000002c 00000000 00000001 44042082 2d180088 00000000 00000000 GPR16: c0000a00 00000014 3fffffff 03fe9000 00000015 7ff3be68 c06e0000 00000000 GPR24: 00000000 00000000 00001720 c067df1c c06e0000 00000000 ee054000 c06ab51c NIP [c067df4c] kvmppc_e500_init+0x30/0xf8 LR [c067df44] kvmppc_e500_init+0x28/0xf8 Call Trace: [ee055f80] [c067df44] kvmppc_e500_init+0x28/0xf8 (unreliable) [ee055fb0] [c0001d30] do_one_initcall+0x50/0x1f0 [ee055fe0] [c06721dc] kernel_init+0xa4/0x14c [ee055ff0] [c000e910] kernel_thread+0x4c/0x68 Instruction dump: 9421ffd0 7c0802a6 93410018 9361001c 90010034 93810020 93a10024 93c10028 93e1002c 4bfffe7d 2c030000 408200a4 <7c1082a6> 90010008 7c1182a6 9001000c ---[ end trace b8ef4903fcbf9dd3 ]--- Since it doesn't make sense to run the init function on any non-supported platform, we can just call our "is this platform supported?" function and bail out of init() if it's not. Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/e500.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/e500.c b/arch/powerpc/kvm/e500.c index 709d82f956e..ddcd896fa2f 100644 --- a/arch/powerpc/kvm/e500.c +++ b/arch/powerpc/kvm/e500.c @@ -229,6 +229,10 @@ static int __init kvmppc_e500_init(void) unsigned long ivor[3]; unsigned long max_ivor = 0; + r = kvmppc_core_check_processor_compat(); + if (r) + return r; + r = kvmppc_booke_init(); if (r) return r; -- cgit v1.2.3 From b4e706111d501991c59d2af23a299ab52a06b03d Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Mon, 16 Jan 2012 16:50:10 +0100 Subject: KVM: PPC: Convert RMA allocation into generic code We have code to allocate big chunks of linear memory on bootup for later use. This code is currently used for RMA allocation, but can be useful beyond that extent. Make it generic so we can reuse it for other stuff later. Signed-off-by: Alexander Graf Acked-by: Paul Mackerras Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_host.h | 7 +- arch/powerpc/include/asm/kvm_ppc.h | 8 +- arch/powerpc/kernel/setup_64.c | 2 +- arch/powerpc/kvm/book3s_hv.c | 8 +- arch/powerpc/kvm/book3s_hv_builtin.c | 175 +++++++++++++++++++++-------------- 5 files changed, 118 insertions(+), 82 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index af438b1e8a3..8221e717bbc 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -173,12 +173,13 @@ struct kvmppc_spapr_tce_table { struct page *pages[0]; }; -struct kvmppc_rma_info { +struct kvmppc_linear_info { void *base_virt; unsigned long base_pfn; unsigned long npages; struct list_head list; - atomic_t use_count; + atomic_t use_count; + int type; }; /* @@ -224,7 +225,7 @@ struct kvm_arch { int tlbie_lock; unsigned long lpcr; unsigned long rmor; - struct kvmppc_rma_info *rma; + struct kvmppc_linear_info *rma; unsigned long vrma_slb_v; int rma_setup_done; int using_mmu_notifiers; diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h index a61b5b5047d..1c37a2f8d0f 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -128,8 +128,8 @@ extern long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm, struct kvm_create_spapr_tce *args); extern long kvm_vm_ioctl_allocate_rma(struct kvm *kvm, struct kvm_allocate_rma *rma); -extern struct kvmppc_rma_info *kvm_alloc_rma(void); -extern void kvm_release_rma(struct kvmppc_rma_info *ri); +extern struct kvmppc_linear_info *kvm_alloc_rma(void); +extern void kvm_release_rma(struct kvmppc_linear_info *ri); extern int kvmppc_core_init_vm(struct kvm *kvm); extern void kvmppc_core_destroy_vm(struct kvm *kvm); extern int kvmppc_core_prepare_memory_region(struct kvm *kvm, @@ -187,13 +187,13 @@ static inline void kvmppc_set_xics_phys(int cpu, unsigned long addr) paca[cpu].kvm_hstate.xics_phys = addr; } -extern void kvm_rma_init(void); +extern void kvm_linear_init(void); #else static inline void kvmppc_set_xics_phys(int cpu, unsigned long addr) {} -static inline void kvm_rma_init(void) +static inline void kvm_linear_init(void) {} #endif diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index 4cb8f1e9d04..4721b0c8d7b 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c @@ -598,7 +598,7 @@ void __init setup_arch(char **cmdline_p) /* Initialize the MMU context management stuff */ mmu_context_init(); - kvm_rma_init(); + kvm_linear_init(); ppc64_boot_msg(0x15, "Setup Done"); } diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 3580db8a232..ce1cac76519 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -1055,7 +1055,7 @@ static inline int lpcr_rmls(unsigned long rma_size) static int kvm_rma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) { - struct kvmppc_rma_info *ri = vma->vm_file->private_data; + struct kvmppc_linear_info *ri = vma->vm_file->private_data; struct page *page; if (vmf->pgoff >= ri->npages) @@ -1080,7 +1080,7 @@ static int kvm_rma_mmap(struct file *file, struct vm_area_struct *vma) static int kvm_rma_release(struct inode *inode, struct file *filp) { - struct kvmppc_rma_info *ri = filp->private_data; + struct kvmppc_linear_info *ri = filp->private_data; kvm_release_rma(ri); return 0; @@ -1093,7 +1093,7 @@ static struct file_operations kvm_rma_fops = { long kvm_vm_ioctl_allocate_rma(struct kvm *kvm, struct kvm_allocate_rma *ret) { - struct kvmppc_rma_info *ri; + struct kvmppc_linear_info *ri; long fd; ri = kvm_alloc_rma(); @@ -1212,7 +1212,7 @@ static int kvmppc_hv_setup_rma(struct kvm_vcpu *vcpu) { int err = 0; struct kvm *kvm = vcpu->kvm; - struct kvmppc_rma_info *ri = NULL; + struct kvmppc_linear_info *ri = NULL; unsigned long hva; struct kvm_memory_slot *memslot; struct vm_area_struct *vma; diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c index a795a13f4a7..1c7e6ab5f9d 100644 --- a/arch/powerpc/kvm/book3s_hv_builtin.c +++ b/arch/powerpc/kvm/book3s_hv_builtin.c @@ -18,6 +18,14 @@ #include #include +#define KVM_LINEAR_RMA 0 + +static void __init kvm_linear_init_one(ulong size, int count, int type); +static struct kvmppc_linear_info *kvm_alloc_linear(int type); +static void kvm_release_linear(struct kvmppc_linear_info *ri); + +/*************** RMA *************/ + /* * This maintains a list of RMAs (real mode areas) for KVM guests to use. * Each RMA has to be physically contiguous and of a size that the @@ -29,32 +37,6 @@ static unsigned long kvm_rma_size = 64 << 20; /* 64MB */ static unsigned long kvm_rma_count; -static int __init early_parse_rma_size(char *p) -{ - if (!p) - return 1; - - kvm_rma_size = memparse(p, &p); - - return 0; -} -early_param("kvm_rma_size", early_parse_rma_size); - -static int __init early_parse_rma_count(char *p) -{ - if (!p) - return 1; - - kvm_rma_count = simple_strtoul(p, NULL, 0); - - return 0; -} -early_param("kvm_rma_count", early_parse_rma_count); - -static struct kvmppc_rma_info *rma_info; -static LIST_HEAD(free_rmas); -static DEFINE_SPINLOCK(rma_lock); - /* Work out RMLS (real mode limit selector) field value for a given RMA size. Assumes POWER7 or PPC970. */ static inline int lpcr_rmls(unsigned long rma_size) @@ -81,45 +63,73 @@ static inline int lpcr_rmls(unsigned long rma_size) } } -/* - * Called at boot time while the bootmem allocator is active, - * to allocate contiguous physical memory for the real memory - * areas for guests. - */ -void __init kvm_rma_init(void) +static int __init early_parse_rma_size(char *p) +{ + if (!p) + return 1; + + kvm_rma_size = memparse(p, &p); + + return 0; +} +early_param("kvm_rma_size", early_parse_rma_size); + +static int __init early_parse_rma_count(char *p) +{ + if (!p) + return 1; + + kvm_rma_count = simple_strtoul(p, NULL, 0); + + return 0; +} +early_param("kvm_rma_count", early_parse_rma_count); + +struct kvmppc_linear_info *kvm_alloc_rma(void) +{ + return kvm_alloc_linear(KVM_LINEAR_RMA); +} +EXPORT_SYMBOL_GPL(kvm_alloc_rma); + +void kvm_release_rma(struct kvmppc_linear_info *ri) +{ + kvm_release_linear(ri); +} +EXPORT_SYMBOL_GPL(kvm_release_rma); + +/*************** generic *************/ + +static LIST_HEAD(free_linears); +static DEFINE_SPINLOCK(linear_lock); + +static void __init kvm_linear_init_one(ulong size, int count, int type) { unsigned long i; unsigned long j, npages; - void *rma; + void *linear; struct page *pg; + const char *typestr; + struct kvmppc_linear_info *linear_info; - /* Only do this on PPC970 in HV mode */ - if (!cpu_has_feature(CPU_FTR_HVMODE) || - !cpu_has_feature(CPU_FTR_ARCH_201)) - return; - - if (!kvm_rma_size || !kvm_rma_count) + if (!count) return; - /* Check that the requested size is one supported in hardware */ - if (lpcr_rmls(kvm_rma_size) < 0) { - pr_err("RMA size of 0x%lx not supported\n", kvm_rma_size); - return; - } - - npages = kvm_rma_size >> PAGE_SHIFT; - rma_info = alloc_bootmem(kvm_rma_count * sizeof(struct kvmppc_rma_info)); - for (i = 0; i < kvm_rma_count; ++i) { - rma = alloc_bootmem_align(kvm_rma_size, kvm_rma_size); - pr_info("Allocated KVM RMA at %p (%ld MB)\n", rma, - kvm_rma_size >> 20); - rma_info[i].base_virt = rma; - rma_info[i].base_pfn = __pa(rma) >> PAGE_SHIFT; - rma_info[i].npages = npages; - list_add_tail(&rma_info[i].list, &free_rmas); - atomic_set(&rma_info[i].use_count, 0); - - pg = pfn_to_page(rma_info[i].base_pfn); + typestr = (type == KVM_LINEAR_RMA) ? "RMA" : ""; + + npages = size >> PAGE_SHIFT; + linear_info = alloc_bootmem(count * sizeof(struct kvmppc_linear_info)); + for (i = 0; i < count; ++i) { + linear = alloc_bootmem_align(size, size); + pr_info("Allocated KVM %s at %p (%ld MB)\n", typestr, linear, + size >> 20); + linear_info[i].base_virt = linear; + linear_info[i].base_pfn = __pa(linear) >> PAGE_SHIFT; + linear_info[i].npages = npages; + linear_info[i].type = type; + list_add_tail(&linear_info[i].list, &free_linears); + atomic_set(&linear_info[i].use_count, 0); + + pg = pfn_to_page(linear_info[i].base_pfn); for (j = 0; j < npages; ++j) { atomic_inc(&pg->_count); ++pg; @@ -127,30 +137,55 @@ void __init kvm_rma_init(void) } } -struct kvmppc_rma_info *kvm_alloc_rma(void) +static struct kvmppc_linear_info *kvm_alloc_linear(int type) { - struct kvmppc_rma_info *ri; + struct kvmppc_linear_info *ri; ri = NULL; - spin_lock(&rma_lock); - if (!list_empty(&free_rmas)) { - ri = list_first_entry(&free_rmas, struct kvmppc_rma_info, list); + spin_lock(&linear_lock); + list_for_each_entry(ri, &free_linears, list) { + if (ri->type != type) + continue; + list_del(&ri->list); atomic_inc(&ri->use_count); + break; } - spin_unlock(&rma_lock); + spin_unlock(&linear_lock); return ri; } -EXPORT_SYMBOL_GPL(kvm_alloc_rma); -void kvm_release_rma(struct kvmppc_rma_info *ri) +static void kvm_release_linear(struct kvmppc_linear_info *ri) { if (atomic_dec_and_test(&ri->use_count)) { - spin_lock(&rma_lock); - list_add_tail(&ri->list, &free_rmas); - spin_unlock(&rma_lock); + spin_lock(&linear_lock); + list_add_tail(&ri->list, &free_linears); + spin_unlock(&linear_lock); } } -EXPORT_SYMBOL_GPL(kvm_release_rma); +/* + * Called at boot time while the bootmem allocator is active, + * to allocate contiguous physical memory for the hash page + * tables for guests. + */ +void __init kvm_linear_init(void) +{ + /* RMA */ + /* Only do this on PPC970 in HV mode */ + if (!cpu_has_feature(CPU_FTR_HVMODE) || + !cpu_has_feature(CPU_FTR_ARCH_201)) + return; + + if (!kvm_rma_size || !kvm_rma_count) + return; + + /* Check that the requested size is one supported in hardware */ + if (lpcr_rmls(kvm_rma_size) < 0) { + pr_err("RMA size of 0x%lx not supported\n", kvm_rma_size); + return; + } + + kvm_linear_init_one(kvm_rma_size, kvm_rma_count, KVM_LINEAR_RMA); +} -- cgit v1.2.3 From b7f5d0114c708d6efd264a2c5e5a31cf292a9cec Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Tue, 17 Jan 2012 15:11:28 +0100 Subject: KVM: PPC: Initialize linears with zeros RMAs and HPT preallocated spaces should be zeroed, so we don't accidently leak information from previous VM executions. Signed-off-by: Alexander Graf Acked-by: Paul Mackerras Signed-off-by: Avi Kivity --- arch/powerpc/kvm/book3s_hv_builtin.c | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c index 1c7e6ab5f9d..7caed1dfd7a 100644 --- a/arch/powerpc/kvm/book3s_hv_builtin.c +++ b/arch/powerpc/kvm/book3s_hv_builtin.c @@ -152,6 +152,7 @@ static struct kvmppc_linear_info *kvm_alloc_linear(int type) break; } spin_unlock(&linear_lock); + memset(ri->base_virt, 0, ri->npages << PAGE_SHIFT); return ri; } -- cgit v1.2.3 From d2a1b483a4a3f4bbb5fec1877f716c15ac7fa405 Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Mon, 16 Jan 2012 19:12:11 +0100 Subject: KVM: PPC: Add HPT preallocator We're currently allocating 16MB of linear memory on demand when creating a guest. That does work some times, but finding 16MB of linear memory available in the system at runtime is definitely not a given. So let's add another command line option similar to the RMA preallocator, that we can use to keep a pool of page tables around. Now, when a guest gets created it has a pretty low chance of receiving an OOM. Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_host.h | 1 + arch/powerpc/include/asm/kvm_ppc.h | 2 ++ arch/powerpc/kvm/book3s_64_mmu_hv.c | 19 +++++++++++++++--- arch/powerpc/kvm/book3s_hv_builtin.c | 39 +++++++++++++++++++++++++++++++++++- 4 files changed, 57 insertions(+), 4 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 8221e717bbc..1843d5d2a3b 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -235,6 +235,7 @@ struct kvm_arch { int slot_npages[KVM_MEM_SLOTS_NUM]; unsigned short last_vcpu[NR_CPUS]; struct kvmppc_vcore *vcores[KVM_MAX_VCORES]; + struct kvmppc_linear_info *hpt_li; #endif /* CONFIG_KVM_BOOK3S_64_HV */ }; diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h index 1c37a2f8d0f..9d6dee0f7d4 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -130,6 +130,8 @@ extern long kvm_vm_ioctl_allocate_rma(struct kvm *kvm, struct kvm_allocate_rma *rma); extern struct kvmppc_linear_info *kvm_alloc_rma(void); extern void kvm_release_rma(struct kvmppc_linear_info *ri); +extern struct kvmppc_linear_info *kvm_alloc_hpt(void); +extern void kvm_release_hpt(struct kvmppc_linear_info *li); extern int kvmppc_core_init_vm(struct kvm *kvm); extern void kvmppc_core_destroy_vm(struct kvm *kvm); extern int kvmppc_core_prepare_memory_region(struct kvm *kvm, diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index 783cd3510c9..ddc485a529f 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -44,10 +44,20 @@ long kvmppc_alloc_hpt(struct kvm *kvm) unsigned long hpt; unsigned long lpid; struct revmap_entry *rev; + struct kvmppc_linear_info *li; /* Allocate guest's hashed page table */ - hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_REPEAT|__GFP_NOWARN, - HPT_ORDER - PAGE_SHIFT); + li = kvm_alloc_hpt(); + if (li) { + /* using preallocated memory */ + hpt = (ulong)li->base_virt; + kvm->arch.hpt_li = li; + } else { + /* using dynamic memory */ + hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_REPEAT| + __GFP_NOWARN, HPT_ORDER - PAGE_SHIFT); + } + if (!hpt) { pr_err("kvm_alloc_hpt: Couldn't alloc HPT\n"); return -ENOMEM; @@ -88,7 +98,10 @@ void kvmppc_free_hpt(struct kvm *kvm) { clear_bit(kvm->arch.lpid, lpid_inuse); vfree(kvm->arch.revmap); - free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT); + if (kvm->arch.hpt_li) + kvm_release_hpt(kvm->arch.hpt_li); + else + free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT); } /* Bits in first HPTE dword for pagesize 4k, 64k or 16M */ diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c index 7caed1dfd7a..bed1279aa6a 100644 --- a/arch/powerpc/kvm/book3s_hv_builtin.c +++ b/arch/powerpc/kvm/book3s_hv_builtin.c @@ -19,6 +19,7 @@ #include #define KVM_LINEAR_RMA 0 +#define KVM_LINEAR_HPT 1 static void __init kvm_linear_init_one(ulong size, int count, int type); static struct kvmppc_linear_info *kvm_alloc_linear(int type); @@ -97,6 +98,39 @@ void kvm_release_rma(struct kvmppc_linear_info *ri) } EXPORT_SYMBOL_GPL(kvm_release_rma); +/*************** HPT *************/ + +/* + * This maintains a list of big linear HPT tables that contain the GVA->HPA + * memory mappings. If we don't reserve those early on, we might not be able + * to get a big (usually 16MB) linear memory region from the kernel anymore. + */ + +static unsigned long kvm_hpt_count; + +static int __init early_parse_hpt_count(char *p) +{ + if (!p) + return 1; + + kvm_hpt_count = simple_strtoul(p, NULL, 0); + + return 0; +} +early_param("kvm_hpt_count", early_parse_hpt_count); + +struct kvmppc_linear_info *kvm_alloc_hpt(void) +{ + return kvm_alloc_linear(KVM_LINEAR_HPT); +} +EXPORT_SYMBOL_GPL(kvm_alloc_hpt); + +void kvm_release_hpt(struct kvmppc_linear_info *li) +{ + kvm_release_linear(li); +} +EXPORT_SYMBOL_GPL(kvm_release_hpt); + /*************** generic *************/ static LIST_HEAD(free_linears); @@ -114,7 +148,7 @@ static void __init kvm_linear_init_one(ulong size, int count, int type) if (!count) return; - typestr = (type == KVM_LINEAR_RMA) ? "RMA" : ""; + typestr = (type == KVM_LINEAR_RMA) ? "RMA" : "HPT"; npages = size >> PAGE_SHIFT; linear_info = alloc_bootmem(count * sizeof(struct kvmppc_linear_info)); @@ -173,6 +207,9 @@ static void kvm_release_linear(struct kvmppc_linear_info *ri) */ void __init kvm_linear_init(void) { + /* HPT */ + kvm_linear_init_one(1 << HPT_ORDER, kvm_hpt_count, KVM_LINEAR_HPT); + /* RMA */ /* Only do this on PPC970 in HV mode */ if (!cpu_has_feature(CPU_FTR_HVMODE) || -- cgit v1.2.3 From db3fe4eb45f3555d91a7124e18cf3a2f2a30eb90 Mon Sep 17 00:00:00 2001 From: Takuya Yoshikawa Date: Wed, 8 Feb 2012 13:02:18 +0900 Subject: KVM: Introduce kvm_memory_slot::arch and move lpage_info into it Some members of kvm_memory_slot are not used by every architecture. This patch is the first step to make this difference clear by introducing kvm_memory_slot::arch; lpage_info is moved into it. Signed-off-by: Takuya Yoshikawa Signed-off-by: Marcelo Tosatti Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_host.h | 3 +++ arch/powerpc/kvm/powerpc.c | 10 ++++++++++ 2 files changed, 13 insertions(+) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 1843d5d2a3b..52eb9c1f4fe 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -213,6 +213,9 @@ struct revmap_entry { #define KVMPPC_PAGE_WRITETHRU HPTE_R_W /* 0x40 */ #define KVMPPC_GOT_PAGE 0x80 +struct kvm_arch_memory_slot { +}; + struct kvm_arch { #ifdef CONFIG_KVM_BOOK3S_64_HV unsigned long hpt_virt; diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 0e21d155eea..00d7e345b3f 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -281,6 +281,16 @@ long kvm_arch_dev_ioctl(struct file *filp, return -EINVAL; } +void kvm_arch_free_memslot(struct kvm_memory_slot *free, + struct kvm_memory_slot *dont) +{ +} + +int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages) +{ + return 0; +} + int kvm_arch_prepare_memory_region(struct kvm *kvm, struct kvm_memory_slot *memslot, struct kvm_memory_slot old, -- cgit v1.2.3 From 9cc815e46911486f52bec60517d0f7b40d323bbc Mon Sep 17 00:00:00 2001 From: Danny Kukawka Date: Thu, 16 Feb 2012 14:55:54 +0100 Subject: arch/powerpc/kvm/book3s_hv.c: included linux/sched.h twice arch/powerpc/kvm/book3s_hv.c: included 'linux/sched.h' twice, remove the duplicate. Signed-off-by: Danny Kukawka Signed-off-by: Avi Kivity --- arch/powerpc/kvm/book3s_hv.c | 1 - 1 file changed, 1 deletion(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index ce1cac76519..d386b6198bc 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -46,7 +46,6 @@ #include #include #include -#include #include #include #include -- cgit v1.2.3