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-rw-r--r--arch/powerpc/include/asm/mmu-hash64.h10
-rw-r--r--arch/powerpc/kvm/Makefile1
-rw-r--r--arch/powerpc/kvm/book3s_hv.c11
-rw-r--r--arch/powerpc/kvm/book3s_hv_ras.c144
-rw-r--r--arch/powerpc/kvm/book3s_hv_rmhandlers.S75
5 files changed, 213 insertions, 28 deletions
diff --git a/arch/powerpc/include/asm/mmu-hash64.h b/arch/powerpc/include/asm/mmu-hash64.h
index 9673f73eb8d..2fdb47a19ef 100644
--- a/arch/powerpc/include/asm/mmu-hash64.h
+++ b/arch/powerpc/include/asm/mmu-hash64.h
@@ -121,6 +121,16 @@ extern char initial_stab[];
#define PP_RXRX 3 /* Supervisor read, User read */
#define PP_RXXX (HPTE_R_PP0 | 2) /* Supervisor read, user none */
+/* Fields for tlbiel instruction in architecture 2.06 */
+#define TLBIEL_INVAL_SEL_MASK 0xc00 /* invalidation selector */
+#define TLBIEL_INVAL_PAGE 0x000 /* invalidate a single page */
+#define TLBIEL_INVAL_SET_LPID 0x800 /* invalidate a set for current LPID */
+#define TLBIEL_INVAL_SET 0xc00 /* invalidate a set for all LPIDs */
+#define TLBIEL_INVAL_SET_MASK 0xfff000 /* set number to inval. */
+#define TLBIEL_INVAL_SET_SHIFT 12
+
+#define POWER7_TLB_SETS 128 /* # sets in POWER7 TLB */
+
#ifndef __ASSEMBLY__
struct hash_pte {
diff --git a/arch/powerpc/kvm/Makefile b/arch/powerpc/kvm/Makefile
index cd896582867..1e473d46322 100644
--- a/arch/powerpc/kvm/Makefile
+++ b/arch/powerpc/kvm/Makefile
@@ -73,6 +73,7 @@ kvm-book3s_64-builtin-objs-$(CONFIG_KVM_BOOK3S_64_HV) := \
book3s_hv_rmhandlers.o \
book3s_hv_rm_mmu.o \
book3s_64_vio_hv.o \
+ book3s_hv_ras.o \
book3s_hv_builtin.o
kvm-book3s_64-module-objs := \
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index ddbec60cb0d..71d0c90b62b 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -545,6 +545,17 @@ static int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
case BOOK3S_INTERRUPT_PERFMON:
r = RESUME_GUEST;
break;
+ case BOOK3S_INTERRUPT_MACHINE_CHECK:
+ /*
+ * Deliver a machine check interrupt to the guest.
+ * We have to do this, even if the host has handled the
+ * machine check, because machine checks use SRR0/1 and
+ * the interrupt might have trashed guest state in them.
+ */
+ kvmppc_book3s_queue_irqprio(vcpu,
+ BOOK3S_INTERRUPT_MACHINE_CHECK);
+ r = RESUME_GUEST;
+ break;
case BOOK3S_INTERRUPT_PROGRAM:
{
ulong flags;
diff --git a/arch/powerpc/kvm/book3s_hv_ras.c b/arch/powerpc/kvm/book3s_hv_ras.c
new file mode 100644
index 00000000000..35f3cf0269b
--- /dev/null
+++ b/arch/powerpc/kvm/book3s_hv_ras.c
@@ -0,0 +1,144 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * Copyright 2012 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
+ */
+
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <linux/kernel.h>
+#include <asm/opal.h>
+
+/* SRR1 bits for machine check on POWER7 */
+#define SRR1_MC_LDSTERR (1ul << (63-42))
+#define SRR1_MC_IFETCH_SH (63-45)
+#define SRR1_MC_IFETCH_MASK 0x7
+#define SRR1_MC_IFETCH_SLBPAR 2 /* SLB parity error */
+#define SRR1_MC_IFETCH_SLBMULTI 3 /* SLB multi-hit */
+#define SRR1_MC_IFETCH_SLBPARMULTI 4 /* SLB parity + multi-hit */
+#define SRR1_MC_IFETCH_TLBMULTI 5 /* I-TLB multi-hit */
+
+/* DSISR bits for machine check on POWER7 */
+#define DSISR_MC_DERAT_MULTI 0x800 /* D-ERAT multi-hit */
+#define DSISR_MC_TLB_MULTI 0x400 /* D-TLB multi-hit */
+#define DSISR_MC_SLB_PARITY 0x100 /* SLB parity error */
+#define DSISR_MC_SLB_MULTI 0x080 /* SLB multi-hit */
+#define DSISR_MC_SLB_PARMULTI 0x040 /* SLB parity + multi-hit */
+
+/* POWER7 SLB flush and reload */
+static void reload_slb(struct kvm_vcpu *vcpu)
+{
+ struct slb_shadow *slb;
+ unsigned long i, n;
+
+ /* First clear out SLB */
+ asm volatile("slbmte %0,%0; slbia" : : "r" (0));
+
+ /* Do they have an SLB shadow buffer registered? */
+ slb = vcpu->arch.slb_shadow.pinned_addr;
+ if (!slb)
+ return;
+
+ /* Sanity check */
+ n = min_t(u32, slb->persistent, SLB_MIN_SIZE);
+ if ((void *) &slb->save_area[n] > vcpu->arch.slb_shadow.pinned_end)
+ return;
+
+ /* Load up the SLB from that */
+ for (i = 0; i < n; ++i) {
+ unsigned long rb = slb->save_area[i].esid;
+ unsigned long rs = slb->save_area[i].vsid;
+
+ rb = (rb & ~0xFFFul) | i; /* insert entry number */
+ asm volatile("slbmte %0,%1" : : "r" (rs), "r" (rb));
+ }
+}
+
+/* POWER7 TLB flush */
+static void flush_tlb_power7(struct kvm_vcpu *vcpu)
+{
+ unsigned long i, rb;
+
+ rb = TLBIEL_INVAL_SET_LPID;
+ for (i = 0; i < POWER7_TLB_SETS; ++i) {
+ asm volatile("tlbiel %0" : : "r" (rb));
+ rb += 1 << TLBIEL_INVAL_SET_SHIFT;
+ }
+}
+
+/*
+ * On POWER7, see if we can handle a machine check that occurred inside
+ * the guest in real mode, without switching to the host partition.
+ *
+ * Returns: 0 => exit guest, 1 => deliver machine check to guest
+ */
+static long kvmppc_realmode_mc_power7(struct kvm_vcpu *vcpu)
+{
+ unsigned long srr1 = vcpu->arch.shregs.msr;
+ struct opal_machine_check_event *opal_evt;
+ long handled = 1;
+
+ if (srr1 & SRR1_MC_LDSTERR) {
+ /* error on load/store */
+ unsigned long dsisr = vcpu->arch.shregs.dsisr;
+
+ if (dsisr & (DSISR_MC_SLB_PARMULTI | DSISR_MC_SLB_MULTI |
+ DSISR_MC_SLB_PARITY | DSISR_MC_DERAT_MULTI)) {
+ /* flush and reload SLB; flushes D-ERAT too */
+ reload_slb(vcpu);
+ dsisr &= ~(DSISR_MC_SLB_PARMULTI | DSISR_MC_SLB_MULTI |
+ DSISR_MC_SLB_PARITY | DSISR_MC_DERAT_MULTI);
+ }
+ if (dsisr & DSISR_MC_TLB_MULTI) {
+ flush_tlb_power7(vcpu);
+ dsisr &= ~DSISR_MC_TLB_MULTI;
+ }
+ /* Any other errors we don't understand? */
+ if (dsisr & 0xffffffffUL)
+ handled = 0;
+ }
+
+ switch ((srr1 >> SRR1_MC_IFETCH_SH) & SRR1_MC_IFETCH_MASK) {
+ case 0:
+ break;
+ case SRR1_MC_IFETCH_SLBPAR:
+ case SRR1_MC_IFETCH_SLBMULTI:
+ case SRR1_MC_IFETCH_SLBPARMULTI:
+ reload_slb(vcpu);
+ break;
+ case SRR1_MC_IFETCH_TLBMULTI:
+ flush_tlb_power7(vcpu);
+ break;
+ default:
+ handled = 0;
+ }
+
+ /*
+ * See if OPAL has already handled the condition.
+ * We assume that if the condition is recovered then OPAL
+ * will have generated an error log event that we will pick
+ * up and log later.
+ */
+ opal_evt = local_paca->opal_mc_evt;
+ if (opal_evt->version == OpalMCE_V1 &&
+ (opal_evt->severity == OpalMCE_SEV_NO_ERROR ||
+ opal_evt->disposition == OpalMCE_DISPOSITION_RECOVERED))
+ handled = 1;
+
+ if (handled)
+ opal_evt->in_use = 0;
+
+ return handled;
+}
+
+long kvmppc_realmode_machine_check(struct kvm_vcpu *vcpu)
+{
+ if (cpu_has_feature(CPU_FTR_ARCH_206))
+ return kvmppc_realmode_mc_power7(vcpu);
+
+ return 0;
+}
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index b48bd53dd77..10b6c358dd7 100644
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -27,6 +27,7 @@
#include <asm/asm-offsets.h>
#include <asm/exception-64s.h>
#include <asm/kvm_book3s_asm.h>
+#include <asm/mmu-hash64.h>
/*****************************************************************************
* *
@@ -678,8 +679,7 @@ BEGIN_FTR_SECTION
1:
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
-nohpte_cont:
-hcall_real_cont: /* r9 = vcpu, r12 = trap, r13 = paca */
+guest_exit_cont: /* r9 = vcpu, r12 = trap, r13 = paca */
/* Save DEC */
mfspr r5,SPRN_DEC
mftb r6
@@ -700,6 +700,11 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
std r6, VCPU_FAULT_DAR(r9)
stw r7, VCPU_FAULT_DSISR(r9)
+ /* See if it is a machine check */
+ cmpwi r12, BOOK3S_INTERRUPT_MACHINE_CHECK
+ beq machine_check_realmode
+mc_cont:
+
/* Save guest CTRL register, set runlatch to 1 */
6: mfspr r6,SPRN_CTRLF
stw r6,VCPU_CTRL(r9)
@@ -1112,38 +1117,41 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
/*
* For external and machine check interrupts, we need
* to call the Linux handler to process the interrupt.
- * We do that by jumping to the interrupt vector address
- * which we have in r12. The [h]rfid at the end of the
+ * We do that by jumping to absolute address 0x500 for
+ * external interrupts, or the machine_check_fwnmi label
+ * for machine checks (since firmware might have patched
+ * the vector area at 0x200). The [h]rfid at the end of the
* handler will return to the book3s_hv_interrupts.S code.
* For other interrupts we do the rfid to get back
- * to the book3s_interrupts.S code here.
+ * to the book3s_hv_interrupts.S code here.
*/
ld r8, HSTATE_VMHANDLER(r13)
ld r7, HSTATE_HOST_MSR(r13)
+ cmpwi cr1, r12, BOOK3S_INTERRUPT_MACHINE_CHECK
cmpwi r12, BOOK3S_INTERRUPT_EXTERNAL
+BEGIN_FTR_SECTION
beq 11f
- cmpwi r12, BOOK3S_INTERRUPT_MACHINE_CHECK
+END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
/* RFI into the highmem handler, or branch to interrupt handler */
-12: mfmsr r6
- mtctr r12
+ mfmsr r6
li r0, MSR_RI
andc r6, r6, r0
mtmsrd r6, 1 /* Clear RI in MSR */
mtsrr0 r8
mtsrr1 r7
- beqctr
+ beqa 0x500 /* external interrupt (PPC970) */
+ beq cr1, 13f /* machine check */
RFI
-11:
-BEGIN_FTR_SECTION
- b 12b
-END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
- mtspr SPRN_HSRR0, r8
+ /* On POWER7, we have external interrupts set to use HSRR0/1 */
+11: mtspr SPRN_HSRR0, r8
mtspr SPRN_HSRR1, r7
ba 0x500
+13: b machine_check_fwnmi
+
/*
* 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
@@ -1176,7 +1184,7 @@ kvmppc_hdsi:
cmpdi r3, 0 /* retry the instruction */
beq 6f
cmpdi r3, -1 /* handle in kernel mode */
- beq nohpte_cont
+ beq guest_exit_cont
cmpdi r3, -2 /* MMIO emulation; need instr word */
beq 2f
@@ -1190,6 +1198,7 @@ kvmppc_hdsi:
li r10, BOOK3S_INTERRUPT_DATA_STORAGE
li r11, (MSR_ME << 1) | 1 /* synthesize MSR_SF | MSR_ME */
rotldi r11, r11, 63
+fast_interrupt_c_return:
6: ld r7, VCPU_CTR(r9)
lwz r8, VCPU_XER(r9)
mtctr r7
@@ -1222,7 +1231,7 @@ kvmppc_hdsi:
/* Unset guest mode. */
li r0, KVM_GUEST_MODE_NONE
stb r0, HSTATE_IN_GUEST(r13)
- b nohpte_cont
+ b guest_exit_cont
/*
* Similarly for an HISI, reflect it to the guest as an ISI unless
@@ -1248,9 +1257,9 @@ kvmppc_hisi:
ld r11, VCPU_MSR(r9)
li r12, BOOK3S_INTERRUPT_H_INST_STORAGE
cmpdi r3, 0 /* retry the instruction */
- beq 6f
+ beq fast_interrupt_c_return
cmpdi r3, -1 /* handle in kernel mode */
- beq nohpte_cont
+ beq guest_exit_cont
/* Synthesize an ISI for the guest */
mr r11, r3
@@ -1259,12 +1268,7 @@ kvmppc_hisi:
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
+ b fast_interrupt_c_return
3: ld r6, VCPU_KVM(r9) /* not relocated, use VRMA */
ld r5, KVM_VRMA_SLB_V(r6)
@@ -1280,14 +1284,14 @@ kvmppc_hisi:
hcall_try_real_mode:
ld r3,VCPU_GPR(R3)(r9)
andi. r0,r11,MSR_PR
- bne hcall_real_cont
+ bne guest_exit_cont
clrrdi r3,r3,2
cmpldi r3,hcall_real_table_end - hcall_real_table
- bge hcall_real_cont
+ bge guest_exit_cont
LOAD_REG_ADDR(r4, hcall_real_table)
lwzx r3,r3,r4
cmpwi r3,0
- beq hcall_real_cont
+ beq guest_exit_cont
add r3,r3,r4
mtctr r3
mr r3,r9 /* get vcpu pointer */
@@ -1308,7 +1312,7 @@ hcall_real_fallback:
li r12,BOOK3S_INTERRUPT_SYSCALL
ld r9, HSTATE_KVM_VCPU(r13)
- b hcall_real_cont
+ b guest_exit_cont
.globl hcall_real_table
hcall_real_table:
@@ -1567,6 +1571,21 @@ kvm_cede_exit:
li r3,H_TOO_HARD
blr
+ /* Try to handle a machine check in real mode */
+machine_check_realmode:
+ mr r3, r9 /* get vcpu pointer */
+ bl .kvmppc_realmode_machine_check
+ nop
+ cmpdi r3, 0 /* continue exiting from guest? */
+ ld r9, HSTATE_KVM_VCPU(r13)
+ li r12, BOOK3S_INTERRUPT_MACHINE_CHECK
+ beq mc_cont
+ /* If not, deliver a machine check. SRR0/1 are already set */
+ li r10, BOOK3S_INTERRUPT_MACHINE_CHECK
+ li r11, (MSR_ME << 1) | 1 /* synthesize MSR_SF | MSR_ME */
+ rotldi r11, r11, 63
+ b fast_interrupt_c_return
+
secondary_too_late:
ld r5,HSTATE_KVM_VCORE(r13)
HMT_LOW
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-19 05:26:11 +0000