| Message ID | 20210512084446.342526-6-like.xu@linux.intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | KVM: x86/pmu: Add support to enable guest PEBS via PT | expand |
diff --git a/arch/x86/kvm/vmx/capabilities.h b/arch/x86/kvm/vmx/capabilities.h index fd8c9822db9e..e04b50174dd5 100644 --- a/arch/x86/kvm/vmx/capabilities.h +++ b/arch/x86/kvm/vmx/capabilities.h @@ -398,8 +398,11 @@ static inline u64 vmx_get_perf_capabilities(void) perf_cap |= host_perf_cap & PMU_CAP_LBR_FMT; - if (vmx_pebs_supported()) + if (vmx_pebs_supported()) { perf_cap |= host_perf_cap & PERF_CAP_PEBS_MASK; + if (vmx_pt_mode_is_host_guest()) + perf_cap |= host_perf_cap & PERF_CAP_PEBS_OUTPUT_PT; + } return perf_cap; }
The hypervisor userspace can dis/enable it via the MSR-based feature "MSR_IA32_PERF_CAPABILITIES [bit 16]". If guest also has basic PT support, it can output the PEBS records to the PT buffer. Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andi Kleen <andi.kleen@intel.com> Signed-off-by: Like Xu <like.xu@linux.intel.com> --- arch/x86/kvm/vmx/capabilities.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)