diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/vmx/capabilities.h | 7 | ||||
| -rw-r--r-- | arch/x86/kvm/vmx/pmu_intel.c | 7 | ||||
| -rw-r--r-- | arch/x86/kvm/vmx/vmx.c | 12 | ||||
| -rw-r--r-- | arch/x86/kvm/vmx/vmx.h | 1 |
4 files changed, 25 insertions, 2 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 */ diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c index d21104e6f9ec..48529dd127bb 100644 --- a/arch/x86/kvm/vmx/pmu_intel.c +++ b/arch/x86/kvm/vmx/pmu_intel.c @@ -183,6 +183,13 @@ bool intel_pmu_lbr_is_compatible(struct kvm_vcpu *vcpu) return boot_cpu_data.x86_model == guest_cpuid_model(vcpu); } +bool intel_pmu_lbr_is_enabled(struct kvm_vcpu *vcpu) +{ + struct x86_pmu_lbr *lbr = vcpu_to_lbr_records(vcpu); + + return lbr->nr && (vcpu_get_perf_capabilities(vcpu) & PMU_CAP_LBR_FMT); +} + static bool intel_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr) { struct kvm_pmu *pmu = vcpu_to_pmu(vcpu); diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 9a978a49721b..c5cbef2402b8 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -1950,6 +1950,16 @@ static u64 nested_vmx_truncate_sysenter_addr(struct kvm_vcpu *vcpu, return (unsigned long)data; } +static u64 vcpu_supported_debugctl(struct kvm_vcpu *vcpu) +{ + u64 debugctl = vmx_supported_debugctl(); + + if (!intel_pmu_lbr_is_enabled(vcpu)) + debugctl &= ~DEBUGCTLMSR_LBR; + + return debugctl; +} + /* * Writes msr value into the appropriate "register". * Returns 0 on success, non-0 otherwise. @@ -2001,7 +2011,7 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) vmcs_writel(GUEST_SYSENTER_ESP, data); break; case MSR_IA32_DEBUGCTLMSR: { - u64 invalid = data & ~vmx_supported_debugctl(); + u64 invalid = data & ~vcpu_supported_debugctl(vcpu); if (invalid & (DEBUGCTLMSR_BTF|DEBUGCTLMSR_LBR)) { if (report_ignored_msrs) vcpu_unimpl(vcpu, "%s: BTF|LBR in IA32_DEBUGCTLMSR 0x%llx, nop\n", diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h index df61b0d09eb7..3836daf7d489 100644 --- a/arch/x86/kvm/vmx/vmx.h +++ b/arch/x86/kvm/vmx/vmx.h @@ -97,6 +97,7 @@ union vmx_exit_reason { #define vcpu_to_lbr_records(vcpu) (&to_vmx(vcpu)->lbr_desc.records) bool intel_pmu_lbr_is_compatible(struct kvm_vcpu *vcpu); +bool intel_pmu_lbr_is_enabled(struct kvm_vcpu *vcpu); struct lbr_desc { /* Basic info about guest LBR records. */ |