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KVM: PPC: Book3S HV: Save/restore SIAR and SDAR along with other PMU registers 

Currently we are not saving and restoring the SIAR and SDAR registers in
the PMU (performance monitor unit) on guest entry and exit.  The result
is that performance monitoring tools in the guest could get false
information about where a program was executing and what data it was
accessing at the time of a performance monitor interrupt.  This fixes
it by saving and restoring these registers along with the other PMU
registers on guest entry/exit.

This also provides a way for userspace to access these values for a
vcpu via the one_reg interface.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Paul Mackerras 2013-09-06 13:11:18 +10:00 committed by Alexander Graf
parent 3b7834743f
commit 14941789f2
4 changed files with 24 additions and 0 deletions
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2
arch/powerpc/include/asm/kvm_host.h
View File

@ -493,6 +493,8 @@ struct kvm_vcpu_arch {
u64 mmcr[3];
u32 pmc[8];
u64 siar;
u64 sdar;
#ifdef CONFIG_KVM_EXIT_TIMING
struct mutex exit_timing_lock;

2
arch/powerpc/kernel/asm-offsets.c
View File

@ -508,6 +508,8 @@ int main(void)
DEFINE(VCPU_PRODDED, offsetof(struct kvm_vcpu, arch.prodded));
DEFINE(VCPU_MMCR, offsetof(struct kvm_vcpu, arch.mmcr));
DEFINE(VCPU_PMC, offsetof(struct kvm_vcpu, arch.pmc));
DEFINE(VCPU_SIAR, offsetof(struct kvm_vcpu, arch.siar));
DEFINE(VCPU_SDAR, offsetof(struct kvm_vcpu, arch.sdar));
DEFINE(VCPU_SLB, offsetof(struct kvm_vcpu, arch.slb));
DEFINE(VCPU_SLB_MAX, offsetof(struct kvm_vcpu, arch.slb_max));
DEFINE(VCPU_SLB_NR, offsetof(struct kvm_vcpu, arch.slb_nr));

12
arch/powerpc/kvm/book3s_hv.c
View File

@ -749,6 +749,12 @@ int kvmppc_get_one_reg(struct kvm_vcpu *vcpu, u64 id, union kvmppc_one_reg *val)
i = id - KVM_REG_PPC_PMC1;
*val = get_reg_val(id, vcpu->arch.pmc[i]);
break;
case KVM_REG_PPC_SIAR:
*val = get_reg_val(id, vcpu->arch.siar);
break;
case KVM_REG_PPC_SDAR:
*val = get_reg_val(id, vcpu->arch.sdar);
break;
#ifdef CONFIG_VSX
case KVM_REG_PPC_FPR0 ... KVM_REG_PPC_FPR31:
if (cpu_has_feature(CPU_FTR_VSX)) {
@ -833,6 +839,12 @@ int kvmppc_set_one_reg(struct kvm_vcpu *vcpu, u64 id, union kvmppc_one_reg *val)
i = id - KVM_REG_PPC_PMC1;
vcpu->arch.pmc[i] = set_reg_val(id, *val);
break;
case KVM_REG_PPC_SIAR:
vcpu->arch.siar = set_reg_val(id, *val);
break;
case KVM_REG_PPC_SDAR:
vcpu->arch.sdar = set_reg_val(id, *val);
break;
#ifdef CONFIG_VSX
case KVM_REG_PPC_FPR0 ... KVM_REG_PPC_FPR31:
if (cpu_has_feature(CPU_FTR_VSX)) {

8
arch/powerpc/kvm/book3s_hv_rmhandlers.S
View File

@ -200,8 +200,12 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
ld r3, VCPU_MMCR(r4)
ld r5, VCPU_MMCR + 8(r4)
ld r6, VCPU_MMCR + 16(r4)
ld r7, VCPU_SIAR(r4)
ld r8, VCPU_SDAR(r4)
mtspr SPRN_MMCR1, r5
mtspr SPRN_MMCRA, r6
mtspr SPRN_SIAR, r7
mtspr SPRN_SDAR, r8
mtspr SPRN_MMCR0, r3
isync
@ -1134,9 +1138,13 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
std r3, VCPU_MMCR(r9) /* if not, set saved MMCR0 to FC */
b 22f
21: mfspr r5, SPRN_MMCR1
mfspr r7, SPRN_SIAR
mfspr r8, SPRN_SDAR
std r4, VCPU_MMCR(r9)
std r5, VCPU_MMCR + 8(r9)
std r6, VCPU_MMCR + 16(r9)
std r7, VCPU_SIAR(r9)
std r8, VCPU_SDAR(r9)
mfspr r3, SPRN_PMC1
mfspr r4, SPRN_PMC2
mfspr r5, SPRN_PMC3