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@xxxxxxxxxxxxxxx>
Cc: Andi Kleen <andi.kleen@xxxxxxxxx>
Signed-off-by: Like Xu <like.xu@xxxxxxxxxxxxxxx>
---
arch/x86/kvm/vmx/capabilities.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
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;
}
--
2.31.1
