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| author | Like Xu <like.xu@linux.intel.com> | 2021-02-01 08:10:31 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-02-04 13:27:24 +0300 |
| commit | c646236344e9054cc84cd5a9f763163b9654cf7e (patch) | |
| tree | 09df32dacf9da772f2edc8f3896e4d7843a40f28 /arch/x86/kvm/vmx/capabilities.h | |
| parent | 9c9520ce883386dc3794c7d60204487ff1db09cb (diff) | |
| download | linux-c646236344e9054cc84cd5a9f763163b9654cf7e.tar.xz | |
KVM: vmx/pmu: Add PMU_CAP_LBR_FMT check when guest LBR is enabled
Usespace could set the bits [0, 5] of the IA32_PERF_CAPABILITIES
MSR which tells about the record format stored in the LBR records.
The LBR will 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: Like Xu <like.xu@linux.intel.com>
Message-Id: <20210201051039.255478-4-like.xu@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/vmx/capabilities.h')
| -rw-r--r-- | arch/x86/kvm/vmx/capabilities.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86/kvm/vmx/capabilities.h b/arch/x86/kvm/vmx/capabilities.h index da3db1a37b34..787edd8c1fc7 100644 --- a/arch/x86/kvm/vmx/capabilities.h +++ b/arch/x86/kvm/vmx/capabilities.h @@ -387,7 +387,12 @@ static inline u64 vmx_get_perf_capabilities(void) static inline u64 vmx_supported_debugctl(void) { - return 0; + u64 debugctl = 0; + + if (vmx_get_perf_capabilities() & PMU_CAP_LBR_FMT) + debugctl |= DEBUGCTLMSR_LBR; + + return debugctl; } #endif /* __KVM_X86_VMX_CAPS_H */ |