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Date: Thu, 6 Oct 2022 00:03:14 +0000 From: Sean Christopherson <seanjc@...gle.com> To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com> Cc: Mark Rutland <mark.rutland@....com>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>, linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org, Like Xu <like.xu.linux@...il.com> Subject: [PATCH v5 8/8] KVM: x86: Directly query supported PERF_CAPABILITIES for WRMSR checks Use kvm_caps.supported_perf_cap directly instead of bouncing through kvm_get_msr_feature() when checking the incoming value for writes to PERF_CAPABILITIES. Note, kvm_get_msr_feature() is guaranteed to succeed when getting PERF_CAPABILITIES, i.e. dropping that check is a nop. No functional change intended. Signed-off-by: Sean Christopherson <seanjc@...gle.com> --- arch/x86/kvm/x86.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 9443ddb358e6..3afe5f4b1a40 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -3568,20 +3568,15 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) return 1; vcpu->arch.arch_capabilities = data; break; - case MSR_IA32_PERF_CAPABILITIES: { - struct kvm_msr_entry msr_ent = {.index = msr, .data = 0}; - + case MSR_IA32_PERF_CAPABILITIES: if (!msr_info->host_initiated) return 1; - if (kvm_get_msr_feature(&msr_ent)) - return 1; - if (data & ~msr_ent.data) + if (data & ~kvm_caps.supported_perf_cap) 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: -- 2.38.0.rc1.362.ged0d419d3c-goog
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