Re: [PATCH v2 05/15] KVM: vmx/pmu: Emulate MSR_ARCH_LBR_DEPTH for guest Arch LBR

Like Xu
2022-12-22T11:15:48Z

On 25/11/2022 12:05 pm, Yang Weijiang wrote:
> +static bool cpuid_enable_lbr(struct kvm_vcpu *vcpu)
> +{
> + struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
> + struct kvm_cpuid_entry2 *entry;
> + int depth_bit;
> +
> + if (!kvm_cpu_cap_has(X86_FEATURE_ARCH_LBR))
> + return !static_cpu_has(X86_FEATURE_ARCH_LBR) &&
> + cpuid_model_is_consistent(vcpu);

Please add selftests to cover this incompatibility.

And running the SPR vcpu model on a GNR host, the guest arch lbr
should be fully supported as long as both hosts have the same lbr_depth.