diff options
author | Stephen Rothwell <sfr@canb.auug.org.au> | 2023-01-16 13:40:55 +1100 |
---|---|---|
committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2023-01-16 13:40:55 +1100 |
commit | 2e74e89ceb9082adf6bc96a9007266a6169154a8 (patch) | |
tree | 6b7993c611d71280216540bb97713c6f0f30e245 | |
parent | 953fed8c1715f20c175ea63a0a3d61b5cdbb951d (diff) | |
parent | 26520c34e621aac035c2926a44226714cec02c7d (diff) |
Merge branch 'hyperv-next' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git
-rw-r--r-- | arch/x86/include/asm/hyperv-tlfs.h | 17 | ||||
-rw-r--r-- | arch/x86/include/asm/mshyperv.h | 72 | ||||
-rw-r--r-- | arch/x86/kernel/cpu/mshyperv.c | 72 | ||||
-rw-r--r-- | drivers/hv/hv.c | 18 | ||||
-rw-r--r-- | drivers/hv/hv_common.c | 9 | ||||
-rw-r--r-- | drivers/hv/vmbus_drv.c | 2 | ||||
-rw-r--r-- | include/asm-generic/hyperv-tlfs.h | 1 | ||||
-rw-r--r-- | include/asm-generic/mshyperv.h | 1 |
8 files changed, 152 insertions, 40 deletions
diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h index 1e2fe398b66d..0b73a809e9e1 100644 --- a/arch/x86/include/asm/hyperv-tlfs.h +++ b/arch/x86/include/asm/hyperv-tlfs.h @@ -116,6 +116,9 @@ /* Recommend using the newer ExProcessorMasks interface */ #define HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED BIT(11) +/* Indicates that the hypervisor is nested within a Hyper-V partition. */ +#define HV_X64_HYPERV_NESTED BIT(12) + /* Recommend using enlightened VMCS */ #define HV_X64_ENLIGHTENED_VMCS_RECOMMENDED BIT(14) @@ -225,6 +228,17 @@ enum hv_isolation_type { #define HV_REGISTER_SINT15 0x4000009F /* + * Define synthetic interrupt controller model specific registers for + * nested hypervisor. + */ +#define HV_REGISTER_NESTED_SCONTROL 0x40001080 +#define HV_REGISTER_NESTED_SVERSION 0x40001081 +#define HV_REGISTER_NESTED_SIEFP 0x40001082 +#define HV_REGISTER_NESTED_SIMP 0x40001083 +#define HV_REGISTER_NESTED_EOM 0x40001084 +#define HV_REGISTER_NESTED_SINT0 0x40001090 + +/* * Synthetic Timer MSRs. Four timers per vcpu. */ #define HV_REGISTER_STIMER0_CONFIG 0x400000B0 @@ -371,7 +385,8 @@ struct hv_nested_enlightenments_control { __u32 reserved:31; } features; struct { - __u32 reserved; + __u32 inter_partition_comm:1; + __u32 reserved:31; } hypercallControls; } __packed; diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 6d502f3efb0f..15ac2d03ac59 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -72,10 +72,16 @@ static inline u64 hv_do_hypercall(u64 control, void *input, void *output) return hv_status; } +/* Hypercall to the L0 hypervisor */ +static inline u64 hv_do_nested_hypercall(u64 control, void *input, void *output) +{ + return hv_do_hypercall(control | HV_HYPERCALL_NESTED, input, output); +} + /* Fast hypercall with 8 bytes of input and no output */ -static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1) +static inline u64 _hv_do_fast_hypercall8(u64 control, u64 input1) { - u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT; + u64 hv_status; #ifdef CONFIG_X86_64 { @@ -103,10 +109,24 @@ static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1) return hv_status; } +static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1) +{ + u64 control = (u64)code | HV_HYPERCALL_FAST_BIT; + + return _hv_do_fast_hypercall8(control, input1); +} + +static inline u64 hv_do_fast_nested_hypercall8(u16 code, u64 input1) +{ + u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED; + + return _hv_do_fast_hypercall8(control, input1); +} + /* Fast hypercall with 16 bytes of input */ -static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2) +static inline u64 _hv_do_fast_hypercall16(u64 control, u64 input1, u64 input2) { - u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT; + u64 hv_status; #ifdef CONFIG_X86_64 { @@ -137,6 +157,20 @@ static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2) return hv_status; } +static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2) +{ + u64 control = (u64)code | HV_HYPERCALL_FAST_BIT; + + return _hv_do_fast_hypercall16(control, input1, input2); +} + +static inline u64 hv_do_fast_nested_hypercall16(u16 code, u64 input1, u64 input2) +{ + u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED; + + return _hv_do_fast_hypercall16(control, input1, input2); +} + extern struct hv_vp_assist_page **hv_vp_assist_page; static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu) @@ -196,30 +230,10 @@ static inline bool hv_is_synic_reg(unsigned int reg) return false; } -static inline u64 hv_get_register(unsigned int reg) -{ - u64 value; - - if (hv_is_synic_reg(reg) && hv_isolation_type_snp()) - hv_ghcb_msr_read(reg, &value); - else - rdmsrl(reg, value); - return value; -} - -static inline void hv_set_register(unsigned int reg, u64 value) -{ - if (hv_is_synic_reg(reg) && hv_isolation_type_snp()) { - hv_ghcb_msr_write(reg, value); - - /* Write proxy bit via wrmsl instruction */ - if (reg >= HV_REGISTER_SINT0 && - reg <= HV_REGISTER_SINT15) - wrmsrl(reg, value | 1 << 20); - } else { - wrmsrl(reg, value); - } -} +u64 hv_get_register(unsigned int reg); +void hv_set_register(unsigned int reg, u64 value); +u64 hv_get_non_nested_register(unsigned int reg); +void hv_set_non_nested_register(unsigned int reg, u64 value); #else /* CONFIG_HYPERV */ static inline void hyperv_init(void) {} @@ -239,6 +253,8 @@ static inline int hyperv_flush_guest_mapping_range(u64 as, } static inline void hv_set_register(unsigned int reg, u64 value) { } static inline u64 hv_get_register(unsigned int reg) { return 0; } +static inline void hv_set_non_nested_register(unsigned int reg, u64 value) { } +static inline u64 hv_get_non_nested_register(unsigned int reg) { return 0; } static inline int hv_set_mem_host_visibility(unsigned long addr, int numpages, bool visible) { diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index bfbdc072017d..b8bb13daacf7 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -37,9 +37,76 @@ /* Is Linux running as the root partition? */ bool hv_root_partition; +/* Is Linux running on nested Microsoft Hypervisor */ +bool hv_nested; struct ms_hyperv_info ms_hyperv; +static inline unsigned int hv_get_nested_reg(unsigned int reg) +{ + switch (reg) { + case HV_REGISTER_SIMP: + return HV_REGISTER_NESTED_SIMP; + case HV_REGISTER_SIEFP: + return HV_REGISTER_NESTED_SIEFP; + case HV_REGISTER_SVERSION: + return HV_REGISTER_NESTED_SVERSION; + case HV_REGISTER_SCONTROL: + return HV_REGISTER_NESTED_SCONTROL; + case HV_REGISTER_SINT0: + return HV_REGISTER_NESTED_SINT0; + case HV_REGISTER_EOM: + return HV_REGISTER_NESTED_EOM; + default: + return reg; + } +} + #if IS_ENABLED(CONFIG_HYPERV) +u64 hv_get_non_nested_register(unsigned int reg) +{ + u64 value; + + if (hv_is_synic_reg(reg) && hv_isolation_type_snp()) + hv_ghcb_msr_read(reg, &value); + else + rdmsrl(reg, value); + return value; +} +EXPORT_SYMBOL_GPL(hv_get_non_nested_register); + +void hv_set_non_nested_register(unsigned int reg, u64 value) +{ + if (hv_is_synic_reg(reg) && hv_isolation_type_snp()) { + hv_ghcb_msr_write(reg, value); + + /* Write proxy bit via wrmsl instruction */ + if (reg >= HV_REGISTER_SINT0 && + reg <= HV_REGISTER_SINT15) + wrmsrl(reg, value | 1 << 20); + } else { + wrmsrl(reg, value); + } +} +EXPORT_SYMBOL_GPL(hv_set_non_nested_register); + +u64 hv_get_register(unsigned int reg) +{ + if (hv_nested) + reg = hv_get_nested_reg(reg); + + return hv_get_non_nested_register(reg); +} +EXPORT_SYMBOL_GPL(hv_get_register); + +void hv_set_register(unsigned int reg, u64 value) +{ + if (hv_nested) + reg = hv_get_nested_reg(reg); + + hv_set_non_nested_register(reg, value); +} +EXPORT_SYMBOL_GPL(hv_set_register); + static void (*vmbus_handler)(void); static void (*hv_stimer0_handler)(void); static void (*hv_kexec_handler)(void); @@ -301,6 +368,11 @@ static void __init ms_hyperv_init_platform(void) pr_info("Hyper-V: running as root partition\n"); } + if (ms_hyperv.hints & HV_X64_HYPERV_NESTED) { + hv_nested = true; + pr_info("Hyper-V: running on a nested hypervisor\n"); + } + /* * Extract host information. */ diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c index 4d6480d57546..8b0dd8e5244d 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -147,7 +147,7 @@ int hv_synic_alloc(void) * Synic message and event pages are allocated by paravisor. * Skip these pages allocation here. */ - if (!hv_isolation_type_snp()) { + if (!hv_isolation_type_snp() && !hv_root_partition) { hv_cpu->synic_message_page = (void *)get_zeroed_page(GFP_ATOMIC); if (hv_cpu->synic_message_page == NULL) { @@ -216,7 +216,7 @@ void hv_synic_enable_regs(unsigned int cpu) simp.as_uint64 = hv_get_register(HV_REGISTER_SIMP); simp.simp_enabled = 1; - if (hv_isolation_type_snp()) { + if (hv_isolation_type_snp() || hv_root_partition) { hv_cpu->synic_message_page = memremap(simp.base_simp_gpa << HV_HYP_PAGE_SHIFT, HV_HYP_PAGE_SIZE, MEMREMAP_WB); @@ -233,7 +233,7 @@ void hv_synic_enable_regs(unsigned int cpu) siefp.as_uint64 = hv_get_register(HV_REGISTER_SIEFP); siefp.siefp_enabled = 1; - if (hv_isolation_type_snp()) { + if (hv_isolation_type_snp() || hv_root_partition) { hv_cpu->synic_event_page = memremap(siefp.base_siefp_gpa << HV_HYP_PAGE_SHIFT, HV_HYP_PAGE_SIZE, MEMREMAP_WB); @@ -315,20 +315,24 @@ void hv_synic_disable_regs(unsigned int cpu) * addresses. */ simp.simp_enabled = 0; - if (hv_isolation_type_snp()) + if (hv_isolation_type_snp() || hv_root_partition) { memunmap(hv_cpu->synic_message_page); - else + hv_cpu->synic_message_page = NULL; + } else { simp.base_simp_gpa = 0; + } hv_set_register(HV_REGISTER_SIMP, simp.as_uint64); siefp.as_uint64 = hv_get_register(HV_REGISTER_SIEFP); siefp.siefp_enabled = 0; - if (hv_isolation_type_snp()) + if (hv_isolation_type_snp() || hv_root_partition) { memunmap(hv_cpu->synic_event_page); - else + hv_cpu->synic_event_page = NULL; + } else { siefp.base_siefp_gpa = 0; + } hv_set_register(HV_REGISTER_SIEFP, siefp.as_uint64); diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c index ae68298c0dca..52a6f89ccdbd 100644 --- a/drivers/hv/hv_common.c +++ b/drivers/hv/hv_common.c @@ -25,17 +25,20 @@ #include <asm/mshyperv.h> /* - * hv_root_partition and ms_hyperv are defined here with other Hyper-V - * specific globals so they are shared across all architectures and are + * hv_root_partition, ms_hyperv and hv_nested are defined here with other + * Hyper-V specific globals so they are shared across all architectures and are * built only when CONFIG_HYPERV is defined. But on x86, * ms_hyperv_init_platform() is built even when CONFIG_HYPERV is not - * defined, and it uses these two variables. So mark them as __weak + * defined, and it uses these three variables. So mark them as __weak * here, allowing for an overriding definition in the module containing * ms_hyperv_init_platform(). */ bool __weak hv_root_partition; EXPORT_SYMBOL_GPL(hv_root_partition); +bool __weak hv_nested; +EXPORT_SYMBOL_GPL(hv_nested); + struct ms_hyperv_info __weak ms_hyperv; EXPORT_SYMBOL_GPL(ms_hyperv); diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 3146710d4ac6..1901556efe79 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -2744,7 +2744,7 @@ static int __init hv_acpi_init(void) if (!hv_is_hyperv_initialized()) return -ENODEV; - if (hv_root_partition) + if (hv_root_partition && !hv_nested) return 0; /* diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h index e29ccabf2e09..b870983596b9 100644 --- a/include/asm-generic/hyperv-tlfs.h +++ b/include/asm-generic/hyperv-tlfs.h @@ -194,6 +194,7 @@ enum HV_GENERIC_SET_FORMAT { #define HV_HYPERCALL_VARHEAD_OFFSET 17 #define HV_HYPERCALL_VARHEAD_MASK GENMASK_ULL(26, 17) #define HV_HYPERCALL_RSVD0_MASK GENMASK_ULL(31, 27) +#define HV_HYPERCALL_NESTED BIT_ULL(31) #define HV_HYPERCALL_REP_COMP_OFFSET 32 #define HV_HYPERCALL_REP_COMP_1 BIT_ULL(32) #define HV_HYPERCALL_REP_COMP_MASK GENMASK_ULL(43, 32) diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h index d55d2833a37b..8845a2eca339 100644 --- a/include/asm-generic/mshyperv.h +++ b/include/asm-generic/mshyperv.h @@ -48,6 +48,7 @@ struct ms_hyperv_info { u64 shared_gpa_boundary; }; extern struct ms_hyperv_info ms_hyperv; +extern bool hv_nested; extern void * __percpu *hyperv_pcpu_input_arg; extern void * __percpu *hyperv_pcpu_output_arg; |