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KVM: SVM: Emulate PERF_CNTR_GLOBAL_STATUS_SET for PerfMonV2

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Emulate PERF_CNTR_GLOBAL_STATUS_SET when PerfMonV2 is enumerated to the
guest, as the MSR is supposed to exist in all AMD v2 PMUs.

Fixes: 4a2771895c ("KVM: x86/svm/pmu: Add AMD PerfMonV2 support")
Cc: stable@vger.kernel.org
Cc: Sandipan Das <sandipan.das@amd.com>
Link: https://lore.kernel.org/r/20250711172746.1579423-1-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson
2025-07-11 10:27:46 -07:00
parent e750f85391
commit 68e61f6fd6
4 changed files with 9 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
arch/x86/include/asm/msr-index.h
View File

@@ -733,6 +733,7 @@
#define MSR_AMD64_PERF_CNTR_GLOBAL_STATUS 0xc0000300
#define MSR_AMD64_PERF_CNTR_GLOBAL_CTL 0xc0000301
#define MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_CLR 0xc0000302
#define MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_SET 0xc0000303
/* AMD Hardware Feedback Support MSRs */
#define MSR_AMD_WORKLOAD_CLASS_CONFIG 0xc0000500

5
arch/x86/kvm/pmu.c
View File

@@ -650,6 +650,7 @@ int kvm_pmu_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
msr_info->data = pmu->global_ctrl;
break;
case MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_CLR:
case MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_SET:
case MSR_CORE_PERF_GLOBAL_OVF_CTRL:
msr_info->data = 0;
break;
@@ -711,6 +712,10 @@ int kvm_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
if (!msr_info->host_initiated)
pmu->global_status &= ~data;
break;
case MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_SET:
if (!msr_info->host_initiated)
pmu->global_status |= data & ~pmu->global_status_rsvd;
break;
default:
kvm_pmu_mark_pmc_in_use(vcpu, msr_info->index);
return kvm_pmu_call(set_msr)(vcpu, msr_info);

1
arch/x86/kvm/svm/pmu.c
View File

@@ -113,6 +113,7 @@ static bool amd_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr)
case MSR_AMD64_PERF_CNTR_GLOBAL_STATUS:
case MSR_AMD64_PERF_CNTR_GLOBAL_CTL:
case MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_CLR:
case MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_SET:
return pmu->version > 1;
default:
if (msr > MSR_F15H_PERF_CTR5 &&

2
arch/x86/kvm/x86.c
View File

@@ -367,6 +367,7 @@ static const u32 msrs_to_save_pmu[] = {
MSR_AMD64_PERF_CNTR_GLOBAL_CTL,
MSR_AMD64_PERF_CNTR_GLOBAL_STATUS,
MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_CLR,
MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_SET,
};
static u32 msrs_to_save[ARRAY_SIZE(msrs_to_save_base) +
@@ -7353,6 +7354,7 @@ static void kvm_probe_msr_to_save(u32 msr_index)
case MSR_AMD64_PERF_CNTR_GLOBAL_CTL:
case MSR_AMD64_PERF_CNTR_GLOBAL_STATUS:
case MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_CLR:
case MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_SET:
if (!kvm_cpu_cap_has(X86_FEATURE_PERFMON_V2))
return;
break;