On 2014-12-24 04:14, Wincy Van wrote: > This patch fixes the bug discussed in > https://www.mail-archive.com/kvm@vger.kernel.org/msg109813.html > > This patch uses a new field named irr_delivered to record the > delivery status of edge-triggered interrupts, and clears the > delivered interrupts in kvm_get_ioapic. So it has the same effect > of commit 0bc830b05c667218d703f2026ec866c49df974fc > ("KVM: ioapic: clear IRR for edge-triggered interrupts at delivery") > while avoids the bug of Windows guests. > > Signed-off-by: Wincy Van <fanwenyi0...@gmail.com> > --- > arch/x86/kvm/ioapic.c | 7 ++++++- > arch/x86/kvm/ioapic.h | 1 + > 2 files changed, 7 insertions(+), 1 deletions(-) > > diff --git a/arch/x86/kvm/ioapic.c b/arch/x86/kvm/ioapic.c > index b1947e0..a2e9d96 100644 > --- a/arch/x86/kvm/ioapic.c > +++ b/arch/x86/kvm/ioapic.c > @@ -206,6 +206,8 @@ static int ioapic_set_irq(struct kvm_ioapic *ioapic, > unsigned int irq, > > old_irr = ioapic->irr; > ioapic->irr |= mask; > + if (edge) > + ioapic->irr_delivered &= ~mask; > if ((edge && old_irr == ioapic->irr) || > (!edge && entry.fields.remote_irr)) { > ret = 0; > @@ -349,7 +351,7 @@ static int ioapic_service(struct kvm_ioapic *ioapic, int > irq, bool line_status) > irqe.shorthand = 0; > > if (irqe.trig_mode == IOAPIC_EDGE_TRIG) > - ioapic->irr &= ~(1 << irq); > + ioapic->irr_delivered |= 1 << irq; > > if (irq == RTC_GSI && line_status) { > /* > @@ -597,6 +599,7 @@ static void kvm_ioapic_reset(struct kvm_ioapic *ioapic) > ioapic->base_address = IOAPIC_DEFAULT_BASE_ADDRESS; > ioapic->ioregsel = 0; > ioapic->irr = 0; > + ioapic->irr_delivered = 0; > ioapic->id = 0; > memset(ioapic->irq_eoi, 0x00, IOAPIC_NUM_PINS); > rtc_irq_eoi_tracking_reset(ioapic); > @@ -654,6 +657,7 @@ int kvm_get_ioapic(struct kvm *kvm, struct > kvm_ioapic_state *state) > > spin_lock(&ioapic->lock); > memcpy(state, ioapic, sizeof(struct kvm_ioapic_state)); > + state->irr &= ~ioapic->irr_delivered; > spin_unlock(&ioapic->lock); > return 0; > } > @@ -667,6 +671,7 @@ int kvm_set_ioapic(struct kvm *kvm, struct > kvm_ioapic_state *state) > spin_lock(&ioapic->lock); > memcpy(ioapic, state, sizeof(struct kvm_ioapic_state)); > ioapic->irr = 0; > + ioapic->irr_delivered = 0; > update_handled_vectors(ioapic); > kvm_vcpu_request_scan_ioapic(kvm); > kvm_ioapic_inject_all(ioapic, state->irr); > diff --git a/arch/x86/kvm/ioapic.h b/arch/x86/kvm/ioapic.h > index 3c91955..a5cdfc0 100644 > --- a/arch/x86/kvm/ioapic.h > +++ b/arch/x86/kvm/ioapic.h > @@ -77,6 +77,7 @@ struct kvm_ioapic { > struct rtc_status rtc_status; > struct delayed_work eoi_inject; > u32 irq_eoi[IOAPIC_NUM_PINS]; > + u32 irr_delivered; > }; > > #ifdef DEBUG >
Does this introduce a state which requires save/restore on migration? If so, then you need to extend the existing interface - in a backward-compatible way. If not, please leave a remark on the reason. Jan
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