diff options
| author | Like Xu <like.xu@linux.intel.com> | 2021-02-01 08:10:33 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-02-04 13:27:24 +0300 |
| commit | 8e12911b243e485f5e4c7c5fbc79cdf185728700 (patch) | |
| tree | 4b745be0241532484eabaaae51cf0aa59adc7d87 /arch/x86/kvm/vmx/vmx.h | |
| parent | c646236344e9054cc84cd5a9f763163b9654cf7e (diff) | |
| download | linux-8e12911b243e485f5e4c7c5fbc79cdf185728700.tar.xz | |
KVM: vmx/pmu: Create a guest LBR event when vcpu sets DEBUGCTLMSR_LBR
When vcpu sets DEBUGCTLMSR_LBR in the MSR_IA32_DEBUGCTLMSR, the KVM handler
would create a guest LBR event which enables the callstack mode and none of
hardware counter is assigned. The host perf would schedule and enable this
event as usual but in an exclusive way.
The guest LBR event will be released when the vPMU is reset but soon,
the lazy release mechanism would be applied to this event like a vPMC.
Suggested-by: Andi Kleen <ak@linux.intel.com>
Co-developed-by: Wei Wang <wei.w.wang@intel.com>
Signed-off-by: Wei Wang <wei.w.wang@intel.com>
Signed-off-by: Like Xu <like.xu@linux.intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Message-Id: <20210201051039.255478-6-like.xu@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/vmx/vmx.h')
| -rw-r--r-- | arch/x86/kvm/vmx/vmx.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h index 3836daf7d489..8f33832db044 100644 --- a/arch/x86/kvm/vmx/vmx.h +++ b/arch/x86/kvm/vmx/vmx.h @@ -99,9 +99,19 @@ union vmx_exit_reason { bool intel_pmu_lbr_is_compatible(struct kvm_vcpu *vcpu); bool intel_pmu_lbr_is_enabled(struct kvm_vcpu *vcpu); +int intel_pmu_create_guest_lbr_event(struct kvm_vcpu *vcpu); + struct lbr_desc { /* Basic info about guest LBR records. */ struct x86_pmu_lbr records; + + /* + * Emulate LBR feature via passthrough LBR registers when the + * per-vcpu guest LBR event is scheduled on the current pcpu. + * + * The records may be inaccurate if the host reclaims the LBR. + */ + struct perf_event *event; }; /* |