Messages in this thread |  | | Date | Sun, 25 Dec 2022 12:12:21 +0800 | Subject | Re: [PATCH v2 12/15] KVM: x86/vmx: Disable Arch LBREn bit in #DB and warm reset | From | "Yang, Weijiang" <> |
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On 12/22/2022 7:22 PM, Like Xu wrote: > On 25/11/2022 12:06 pm, Yang Weijiang wrote: >> +static void disable_arch_lbr_ctl(struct kvm_vcpu *vcpu) >> +{ >> + struct lbr_desc *lbr_desc = vcpu_to_lbr_desc(vcpu); >> + struct kvm_pmu *pmu = vcpu_to_pmu(vcpu); >> + >> + if (kvm_cpu_cap_has(X86_FEATURE_ARCH_LBR) && >> + test_bit(INTEL_PMC_IDX_FIXED_VLBR, pmu->pmc_in_use) && >> + lbr_desc->event) { >> + u64 ctl = vmcs_read64(GUEST_IA32_LBR_CTL); >> + >> + vmcs_write64(GUEST_IA32_LBR_CTL, ctl & ~ARCH_LBR_CTL_LBREN); >> + } >> +} >> + >> static void vmx_inject_exception(struct kvm_vcpu *vcpu) >> { >> struct kvm_queued_exception *ex = &vcpu->arch.exception; >> @@ -1738,6 +1752,9 @@ static void vmx_inject_exception(struct >> kvm_vcpu *vcpu) >> vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info); >> vmx_clear_hlt(vcpu); >> + >> + if (ex->vector == DB_VECTOR) >> + disable_arch_lbr_ctl(vcpu); > > Please verify this with KUT testcase, once I failed and did not confirm > if it is a hardware issue. Good Luck.
Can you detail what you want to verify with?
> >> }
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