On 01/11/19 23:41, Suthikulpanit, Suravee wrote: > + /* > + * IRQ window is not needed when AVIC is enabled, > + * unless we have pending ExtINT since it cannot be injected > + * via AVIC. In such case, we need to temporarily disable AVIC, > + * and fallback to injecting IRQ via V_IRQ. > + */ > + if (kvm_vcpu_apicv_active(vcpu)) > + svm_request_update_avic(vcpu, false); This must be pretty heavy-weight on SMP VMs, even if most ExtINT guests do not need SMP in the guest. One alternative is to enable/disable APICv when LVT or IOAPIC registers are written with ExtINT mode. Not a blocker, just an idea to consider. Paolo
