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KVM: x86: set TMR when the interrupt is accepted

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Do not compute TMR in advance.  Instead, set the TMR just before the interrupt
is accepted into the IRR.  This limits the coupling between IOAPIC and LAPIC.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini
2015-07-29 15:03:06 +02:00
parent 58219c1ab3
commit bdaffe1d93
5 changed files with 14 additions and 23 deletions
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19
arch/x86/kvm/lapic.c
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@@ -551,15 +551,6 @@ static void pv_eoi_clr_pending(struct kvm_vcpu *vcpu)
__clear_bit(KVM_APIC_PV_EOI_PENDING, &vcpu->arch.apic_attention);
}
void kvm_apic_update_tmr(struct kvm_vcpu *vcpu, u32 *tmr)
{
struct kvm_lapic *apic = vcpu->arch.apic;
int i;
for (i = 0; i < 8; i++)
apic_set_reg(apic, APIC_TMR + 0x10 * i, tmr[i]);
}
static void apic_update_ppr(struct kvm_lapic *apic)
{
u32 tpr, isrv, ppr, old_ppr;
@@ -781,6 +772,9 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
case APIC_DM_LOWEST:
vcpu->arch.apic_arb_prio++;
case APIC_DM_FIXED:
if (unlikely(trig_mode && !level))
break;
/* FIXME add logic for vcpu on reset */
if (unlikely(!apic_enabled(apic)))
break;
@@ -790,6 +784,13 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
if (dest_map)
__set_bit(vcpu->vcpu_id, dest_map);
if (apic_test_vector(vector, apic->regs + APIC_TMR) != !!trig_mode) {
if (trig_mode)
apic_set_vector(vector, apic->regs + APIC_TMR);
else
apic_clear_vector(vector, apic->regs + APIC_TMR);
}
if (kvm_x86_ops->deliver_posted_interrupt)
kvm_x86_ops->deliver_posted_interrupt(vcpu, vector);
else {