On 12/22/2022 7:19 PM, Like Xu wrote:
On 25/11/2022 12:05 pm, Yang Weijiang wrote:
@@ -727,12 +772,16 @@ static void intel_pmu_reset(struct kvm_vcpu *vcpu)
*/
static void intel_pmu_legacy_freezing_lbrs_on_pmi(struct kvm_vcpu
*vcpu)
{
- u64 data = vmcs_read64(GUEST_IA32_DEBUGCTL);
+ u32 lbr_ctl_field = GUEST_IA32_DEBUGCTL;
- if (data & DEBUGCTLMSR_FREEZE_LBRS_ON_PMI) {
- data &= ~DEBUGCTLMSR_LBR;
- vmcs_write64(GUEST_IA32_DEBUGCTL, data);
- }
+ if (!(vmcs_read64(GUEST_IA32_DEBUGCTL) &
DEBUGCTLMSR_FREEZE_LBRS_ON_PMI))
+ return;
+
+ if (kvm_cpu_cap_has(X86_FEATURE_ARCH_LBR) &&
+ guest_cpuid_has(vcpu, X86_FEATURE_ARCH_LBR))
+ lbr_ctl_field = GUEST_IA32_LBR_CTL;
+
+ vmcs_write64(lbr_ctl_field, vmcs_read64(lbr_ctl_field) & ~0x1ULL);
}
static void intel_pmu_deliver_pmi(struct kvm_vcpu *vcpu)
The legacy lbr test case in KUT does not cover this scenario, but
arch lbr contributor should take the opportunity to fill this gap.
Thanks.
OK, will try to add this missing part check.
