From 4114c27d450bef228be9c7b0c40a888e18a3a636 Mon Sep 17 00:00:00 2001 From: Wei Wang Date: Wed, 5 Nov 2014 10:53:43 +0800 Subject: [PATCH] KVM: x86: reset RVI upon system reset A bug was reported as follows: when running Windows 7 32-bit guests on qemu-kvm, sometimes the guests run into blue screen during reboot. The problem was that a guest's RVI was not cleared when it rebooted. This patch has fixed the problem. Signed-off-by: Wei Wang Signed-off-by: Yang Zhang Tested-by: Rongrong Liu , Da Chun Signed-off-by: Paolo Bonzini --- arch/x86/kvm/lapic.c | 3 +++ arch/x86/kvm/vmx.c | 20 ++++++++++++-------- 2 files changed, 15 insertions(+), 8 deletions(-) diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 5f574b4add9..e7f7fc632a9 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -1714,6 +1714,9 @@ void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu, apic->isr_count = kvm_apic_vid_enabled(vcpu->kvm) ? 1 : count_vectors(apic->regs + APIC_ISR); apic->highest_isr_cache = -1; + if (kvm_x86_ops->hwapic_irr_update) + kvm_x86_ops->hwapic_irr_update(vcpu, + apic_find_highest_irr(apic)); kvm_x86_ops->hwapic_isr_update(vcpu->kvm, apic_find_highest_isr(apic)); kvm_make_request(KVM_REQ_EVENT, vcpu); kvm_rtc_eoi_tracking_restore_one(vcpu); diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index d6e3ddace07..f9d56c1945d 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -7419,6 +7419,9 @@ static void vmx_set_rvi(int vector) u16 status; u8 old; + if (vector == -1) + vector = 0; + status = vmcs_read16(GUEST_INTR_STATUS); old = (u8)status & 0xff; if ((u8)vector != old) { @@ -7430,22 +7433,23 @@ static void vmx_set_rvi(int vector) static void vmx_hwapic_irr_update(struct kvm_vcpu *vcpu, int max_irr) { + if (!is_guest_mode(vcpu)) { + vmx_set_rvi(max_irr); + return; + } + if (max_irr == -1) return; /* - * If a vmexit is needed, vmx_check_nested_events handles it. + * In guest mode. If a vmexit is needed, vmx_check_nested_events + * handles it. */ - if (is_guest_mode(vcpu) && nested_exit_on_intr(vcpu)) + if (nested_exit_on_intr(vcpu)) return; - if (!is_guest_mode(vcpu)) { - vmx_set_rvi(max_irr); - return; - } - /* - * Fall back to pre-APICv interrupt injection since L2 + * Else, fall back to pre-APICv interrupt injection since L2 * is run without virtual interrupt delivery. */ if (!kvm_event_needs_reinjection(vcpu) && -- 2.41.0