Messages in this thread | | | Date | Thu, 22 Dec 2022 19:09:45 +0800 | Subject | Re: [PATCH v2 06/15] KVM: vmx/pmu: Emulate MSR_ARCH_LBR_CTL for guest Arch LBR | From | Like Xu <> |
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On 25/11/2022 12:05 pm, Yang Weijiang wrote: > static int intel_pmu_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) > { > struct kvm_pmu *pmu = vcpu_to_pmu(vcpu); > @@ -377,6 +402,14 @@ static int intel_pmu_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) > case MSR_ARCH_LBR_DEPTH: > msr_info->data = lbr_desc->records.nr; > return 0; > + case MSR_ARCH_LBR_CTL: > + if (!kvm_cpu_cap_has(X86_FEATURE_ARCH_LBR)) { > + WARN_ON_ONCE(!msr_info->host_initiated);
Why we need this warning even in the format of WARN_ON_ONCE() ? And why not for MSR_ARCH_LBR_DEPTH msr ?
> + msr_info->data = 0; > + } else { > + msr_info->data = vmcs_read64(GUEST_IA32_LBR_CTL); > + } > + return 0;
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