From: Yong He <alexyonghe@xxxxxxxxxxx> Try to enable irr_pending when set APIC state, if there is pending interrupt in IRR with disabled APICv. In save/restore VM scenery with disabled APICv. Qemu/CloudHypervisor always send signals to stop running vcpu threads, then save entire VM state, including APIC state. There may be a pending timer interrupt in the saved APIC IRR that is injected before vcpu_run return. But when restoring the VM, since APICv is disabled, irr_pending is disabled by default, so this may cause the timer interrupt in the IRR to be suspended for a long time, until the next interrupt comes. Signed-off-by: Yong He <alexyonghe@xxxxxxxxxxx> --- arch/x86/kvm/lapic.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 2098dc689088..7373f649958b 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -3099,6 +3099,10 @@ int kvm_apic_set_state(struct kvm_vcpu *vcpu, struct kvm_lapic_state *s) apic_find_highest_irr(apic)); kvm_x86_call(hwapic_isr_update)(apic_find_highest_isr(apic)); } + + /* Search the IRR and enable irr_pending state with disabled APICv*/ + if (!enable_apicv && apic_search_irr(apic) != -1) + apic->irr_pending = true; kvm_make_request(KVM_REQ_EVENT, vcpu); if (ioapic_in_kernel(vcpu->kvm)) kvm_rtc_eoi_tracking_restore_one(vcpu); -- 2.43.5
