diff options
| -rw-r--r-- | arch/x86/kvm/svm/nested.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c index a0a525758ed9..8300fd31878d 100644 --- a/arch/x86/kvm/svm/nested.c +++ b/arch/x86/kvm/svm/nested.c @@ -1025,6 +1025,28 @@ int nested_svm_vmexit(struct vcpu_svm *svm) svm_switch_vmcb(svm, &svm->vmcb01); + /* + * Rules for synchronizing int_ctl bits from vmcb02 to vmcb01: + * + * V_IRQ, V_IRQ_VECTOR, V_INTR_PRIO_MASK, V_IGN_TPR: If L1 doesn't + * intercept interrupts, then KVM will use vmcb02's V_IRQ (and related + * flags) to detect interrupt windows for L1 IRQs (even if L1 uses + * virtual interrupt masking). Raise KVM_REQ_EVENT to ensure that + * KVM re-requests an interrupt window if necessary, which implicitly + * copies this bits from vmcb02 to vmcb01. + * + * V_TPR: If L1 doesn't use virtual interrupt masking, then L1's vTPR + * is stored in vmcb02, but its value doesn't need to be copied from/to + * vmcb01 because it is copied from/to the virtual APIC's TPR register + * on each VM entry/exit. + * + * V_GIF: If nested vGIF is not used, KVM uses vmcb02's V_GIF for L1's + * V_GIF. However, GIF is architecturally clear on each VM exit, thus + * there is no need to copy V_GIF from vmcb02 to vmcb01. + */ + if (!nested_exit_on_intr(svm)) + kvm_make_request(KVM_REQ_EVENT, &svm->vcpu); + if (unlikely(svm->lbrv_enabled && (svm->nested.ctl.virt_ext & LBR_CTL_ENABLE_MASK))) { svm_copy_lbrs(vmcb12, vmcb02); svm_update_lbrv(vcpu); |