diff options
| author | Like Xu <likexu@tencent.com> | 2023-06-03 04:10:58 +0300 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2023-06-07 03:31:44 +0300 |
| commit | 94cdeebd82111d7b7da5bd4da053eed9e0f65d72 (patch) | |
| tree | 9f0e16b425b08d67da8cded4c36428d6fe90c61f /arch/x86/kvm/svm/svm.c | |
| parent | 4a2771895ca63a055df815be5e307cce8e85308c (diff) | |
| download | linux-94cdeebd82111d7b7da5bd4da053eed9e0f65d72.tar.xz | |
KVM: x86/cpuid: Add AMD CPUID ExtPerfMonAndDbg leaf 0x80000022
CPUID leaf 0x80000022 i.e. ExtPerfMonAndDbg advertises some new
performance monitoring features for AMD processors.
Bit 0 of EAX indicates support for Performance Monitoring Version 2
(PerfMonV2) features. If found to be set during PMU initialization,
the EBX bits of the same CPUID function can be used to determine
the number of available PMCs for different PMU types.
Expose the relevant bits via KVM_GET_SUPPORTED_CPUID so that
guests can make use of the PerfMonV2 features.
Co-developed-by: Sandipan Das <sandipan.das@amd.com>
Signed-off-by: Sandipan Das <sandipan.das@amd.com>
Signed-off-by: Like Xu <likexu@tencent.com>
Link: https://lore.kernel.org/r/20230603011058.1038821-13-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/kvm/svm/svm.c')
| -rw-r--r-- | arch/x86/kvm/svm/svm.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index d9669e3cc00a..ff48cdea1fbf 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -5036,6 +5036,10 @@ static __init void svm_set_cpu_caps(void) kvm_pmu_cap.num_counters_gp); else kvm_cpu_cap_check_and_set(X86_FEATURE_PERFCTR_CORE); + + if (kvm_pmu_cap.version != 2 || + !kvm_cpu_cap_has(X86_FEATURE_PERFCTR_CORE)) + kvm_cpu_cap_clear(X86_FEATURE_PERFMON_V2); } /* CPUID 0x8000001F (SME/SEV features) */ |