From aea218f3cbbcaac249b6b2c98930a00d6d931f1e Mon Sep 17 00:00:00 2001 From: Gleb Natapov Date: Thu, 26 Jul 2012 10:00:45 +0300 Subject: [PATCH] KVM: PIC: call ack notifiers for irqs that are dropped form irr After commit 242ec97c358256 PIT interrupts are no longer delivered after PIC reset. It happens because PIT injects interrupt only if previous one was acked, but since on PIC reset it is dropped from irr it will never be delivered and hence acknowledged. Fix that by calling ack notifier on PIC reset. Signed-off-by: Gleb Natapov Signed-off-by: Avi Kivity --- arch/x86/kvm/i8259.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c index 1df8fb9e1d5..e498b18f010 100644 --- a/arch/x86/kvm/i8259.c +++ b/arch/x86/kvm/i8259.c @@ -316,6 +316,11 @@ static void pic_ioport_write(void *opaque, u32 addr, u32 val) addr &= 1; if (addr == 0) { if (val & 0x10) { + u8 edge_irr = s->irr & ~s->elcr; + int i; + bool found; + struct kvm_vcpu *vcpu; + s->init4 = val & 1; s->last_irr = 0; s->irr &= s->elcr; @@ -333,6 +338,18 @@ static void pic_ioport_write(void *opaque, u32 addr, u32 val) if (val & 0x08) pr_pic_unimpl( "level sensitive irq not supported"); + + kvm_for_each_vcpu(i, vcpu, s->pics_state->kvm) + if (kvm_apic_accept_pic_intr(vcpu)) { + found = true; + break; + } + + + if (found) + for (irq = 0; irq < PIC_NUM_PINS/2; irq++) + if (edge_irr & (1 << irq)) + pic_clear_isr(s, irq); } else if (val & 0x08) { if (val & 0x04) s->poll = 1; -- 2.46.0