On Intel platforms, KVM agent could configure MSR_IA32_PERF_CAPABILITIES (such as unmask some vmx-supported bits in vcpu->arch.perf_capabilities) to adjust the visibility of guest PMU features for vPMU-enabled guests. Once MSR_IA32_PERF_CAPABILITIES is changed via vmx_set_msr() validly, the adjustment in intel_pmu_refresh() will be triggered. To ensure the sustainability of the new value, the default initialization path is moved to intel_pmu_init(). Signed-off-by: Like Xu <like.xu@xxxxxxxxxxxxxxx> Reviewed-by: Andi Kleen <ak@xxxxxxxxxxxxxxx> --- arch/x86/kvm/vmx/pmu_intel.c | 6 +++--- arch/x86/kvm/vmx/vmx.c | 5 +++++ arch/x86/kvm/x86.c | 2 +- 3 files changed, 9 insertions(+), 4 deletions(-) diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c index a886a47daebd..f8083ecf8c7b 100644 --- a/arch/x86/kvm/vmx/pmu_intel.c +++ b/arch/x86/kvm/vmx/pmu_intel.c @@ -327,7 +327,6 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu) pmu->counter_bitmask[KVM_PMC_FIXED] = 0; pmu->version = 0; pmu->reserved_bits = 0xffffffff00200000ull; - vcpu->arch.perf_capabilities = 0; entry = kvm_find_cpuid_entry(vcpu, 0xa, 0); if (!entry) @@ -340,8 +339,6 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu) return; perf_get_x86_pmu_capability(&x86_pmu); - if (guest_cpuid_has(vcpu, X86_FEATURE_PDCM)) - vcpu->arch.perf_capabilities = vmx_get_perf_capabilities(); pmu->nr_arch_gp_counters = min_t(int, eax.split.num_counters, x86_pmu.num_counters_gp); @@ -401,6 +398,9 @@ static void intel_pmu_init(struct kvm_vcpu *vcpu) pmu->fixed_counters[i].idx = i + INTEL_PMC_IDX_FIXED; pmu->fixed_counters[i].current_config = 0; } + + vcpu->arch.perf_capabilities = guest_cpuid_has(vcpu, X86_FEATURE_PDCM) ? + vmx_get_perf_capabilities() : 0; } static void intel_pmu_reset(struct kvm_vcpu *vcpu) diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 035bd6d279a4..085a14579bbe 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -2209,6 +2209,11 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) if ((data >> 32) != 0) return 1; goto find_uret_msr; + case MSR_IA32_PERF_CAPABILITIES: + if (data && !vcpu_to_pmu(vcpu)->version) + return 1; + ret = kvm_set_msr_common(vcpu, msr_info); + break; default: find_uret_msr: diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index c765fd72a66c..a1b251ae648a 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -3037,7 +3037,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) return 1; vcpu->arch.perf_capabilities = data; - + kvm_pmu_refresh(vcpu); return 0; } case MSR_EFER: -- 2.29.2
