static void __kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu,
struct kvm_ioapic *ioapic, int vector, int trigger_mode)
{
int i;
for (i = 0; i < IOAPIC_NUM_PINS; i++) {
union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i];
if (ent->fields.vector != vector)
continue;
if (i == RTC_GSI)
rtc_irq_eoi(ioapic, vcpu);
/*
* We are dropping lock while calling ack notifiers because ack
* notifier callbacks for assigned devices call into IOAPIC
* recursively. Since remote_irr is cleared only after call
* to notifiers if the same vector will be delivered while lock
* is dropped it will be put into irr and will be delivered
* after ack notifier returns.
*/
spin_unlock(&ioapic->lock);
kvm_notify_acked_irq(ioapic->kvm, KVM_IRQCHIP_IOAPIC, i);
spin_lock(&ioapic->lock);
if (trigger_mode != IOAPIC_LEVEL_TRIG)
continue;
ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
ent->fields.remote_irr = 0;
if (!ent->fields.mask && (ioapic->irr & (1 << i)))
ioapic_service(ioapic, i, false);
}
}
static void __kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu,
struct kvm_ioapic *ioapic, int vector, int trigger_mode)
{
struct dest_map *dest_map = &ioapic->rtc_status.dest_map;
struct kvm_lapic *apic = vcpu->arch.apic;
int i;
/* RTC special handling */
if (test_bit(vcpu->vcpu_id, dest_map->map) &&
vector == dest_map->vectors[vcpu->vcpu_id])
rtc_irq_eoi(ioapic, vcpu);
for (i = 0; i < IOAPIC_NUM_PINS; i++) {
union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i];
if (ent->fields.vector != vector)
continue;
/*
* We are dropping lock while calling ack notifiers because ack
* notifier callbacks for assigned devices call into IOAPIC
* recursively. Since remote_irr is cleared only after call
* to notifiers if the same vector will be delivered while lock
* is dropped it will be put into irr and will be delivered
* after ack notifier returns.
*/
spin_unlock(&ioapic->lock);
kvm_notify_acked_irq(ioapic->kvm, KVM_IRQCHIP_IOAPIC, i);
spin_lock(&ioapic->lock);
if (trigger_mode != IOAPIC_LEVEL_TRIG ||
kvm_lapic_get_reg(apic, APIC_SPIV) & APIC_SPIV_DIRECTED_EOI)
continue;
ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
ent->fields.remote_irr = 0;
if (!ent->fields.mask && (ioapic->irr & (1 << i))) {
++ioapic->irq_eoi[i];
if (ioapic->irq_eoi[i] == IOAPIC_SUCCESSIVE_IRQ_MAX_COUNT) {
/*
* Real hardware does not deliver the interrupt
* immediately during eoi broadcast, and this
* lets a buggy guest make slow progress
* even if it does not correctly handle a
* level-triggered interrupt. Emulate this
* behavior if we detect an interrupt storm.
*/
schedule_delayed_work(&ioapic->eoi_inject, HZ / 100);
ioapic->irq_eoi[i] = 0;
trace_kvm_ioapic_delayed_eoi_inj(ent->bits);
} else {
ioapic_service(ioapic, i, false);
}
} else {
ioapic->irq_eoi[i] = 0;
}
}
}
