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: c59a1f106f5c ("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>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 924016d54fbf28ee99414634161492a27ba294b5..132d662d9713f512070532ec8cef31529dc569ec 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -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: