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KVM: x86: Refresh PMU after writes to MSR_IA32_PERF_CAPABILITIES 

Refresh the PMU if userspace modifies MSR_IA32_PERF_CAPABILITIES.  KVM
consumes the vCPU's PERF_CAPABILITIES when enumerating PEBS support, but
relies on CPUID updates to refresh the PMU.  I.e. KVM will do the wrong
thing if userspace stuffs PERF_CAPABILITIES _after_ setting guest CPUID.

Opportunistically fix a curly-brace indentation.

Fixes: c59a1f106f ("KVM: x86/pmu: Add IA32_PEBS_ENABLE MSR emulation for extended PEBS")
Cc: Like Xu <like.xu.linux@gmail.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220727233424.2968356-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2022-07-27 23:34:22 +00:00 committed by Paolo Bonzini
parent 9d27d46160
commit 17a024a8b9
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kvm/x86.c
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@ -3546,9 +3546,9 @@ 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:
return set_efer(vcpu, msr_info);
case MSR_K7_HWCR: