diff options
| author | Like Xu <likexu@tencent.com> | 2022-04-11 18:19:33 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-06-08 04:47:47 -0400 |
| commit | bef6ecca46ac938ffb352d7fa2f6eafd1b6a41be (patch) | |
| tree | 1575442eff2ef699248c9de76598ea920703ea7f /arch/x86/kvm/vmx/pmu_intel.c | |
| parent | 39a4d779546a993c53cea28e659e8edc9f868af0 (diff) | |
KVM: x86/pmu: Set MSR_IA32_MISC_ENABLE_EMON bit when vPMU is enabled
On Intel platforms, the software can use the IA32_MISC_ENABLE[7] bit to
detect whether the processor supports performance monitoring facility.
It depends on the PMU is enabled for the guest, and a software write
operation to this available bit will be ignored. The proposal to ignore
the toggle in KVM is the way to go and that behavior matches bare metal.
Signed-off-by: Like Xu <likexu@tencent.com>
Message-Id: <20220411101946.20262-5-likexu@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/vmx/pmu_intel.c')
| -rw-r--r-- | arch/x86/kvm/vmx/pmu_intel.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c index 37e9eb32e3d9..b7dd24476b52 100644 --- a/arch/x86/kvm/vmx/pmu_intel.c +++ b/arch/x86/kvm/vmx/pmu_intel.c @@ -498,6 +498,7 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu) if (!pmu->version) return; + vcpu->arch.ia32_misc_enable_msr |= MSR_IA32_MISC_ENABLE_EMON; perf_get_x86_pmu_capability(&x86_pmu); pmu->nr_arch_gp_counters = min_t(int, eax.split.num_counters, |