KVM: vmx/pmu: Expose LBR_FMT in the MSR_IA32_PERF_CAPABILITIES
Userspace could enable guest LBR feature when the exactly supported LBR format value is initialized to the MSR_IA32_PERF_CAPABILITIES and the LBR is also compatible with vPMU version and host cpu model. The LBR could be enabled on the guest if host perf supports LBR (checked via x86_perf_get_lbr()) and the vcpu model is compatible with the host one. Signed-off-by: NLike Xu <like.xu@linux.intel.com> Message-Id: <20210201051039.255478-11-like.xu@linux.intel.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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