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KVM: irq ack notification

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Based on a patch from: Ben-Ami Yassour <benami@il.ibm.com>
which was based on a patch from: Amit Shah <amit.shah@qumranet.com>

Notify IRQ acking on PIC/APIC emulation. The previous patch missed two things:

- Edge triggered interrupts on IOAPIC
- PIC reset with IRR/ISR set should be equivalent to ack (LAPIC probably
needs something similar).

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
CC: Amit Shah <amit.shah@qumranet.com>
CC: Ben-Ami Yassour <benami@il.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Marcelo Tosatti
2008-07-26 17:01:00 -03:00
committed by Avi Kivity
parent 564f15378f
commit f52447261b
6 changed files with 34 additions and 13 deletions
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20
virt/kvm/ioapic.c
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@@ -39,6 +39,7 @@
#include "ioapic.h"
#include "lapic.h"
#include "irq.h"
#if 0
#define ioapic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg)
@@ -285,26 +286,31 @@ void kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
}
}
static void __kvm_ioapic_update_eoi(struct kvm_ioapic *ioapic, int gsi)
static void __kvm_ioapic_update_eoi(struct kvm_ioapic *ioapic, int gsi,
int trigger_mode)
{
union ioapic_redir_entry *ent;
ent = &ioapic->redirtbl[gsi];
ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
ent->fields.remote_irr = 0;
if (!ent->fields.mask && (ioapic->irr & (1 << gsi)))
ioapic_service(ioapic, gsi);
kvm_notify_acked_irq(ioapic->kvm, gsi);
if (trigger_mode == IOAPIC_LEVEL_TRIG) {
ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
ent->fields.remote_irr = 0;
if (!ent->fields.mask && (ioapic->irr & (1 << gsi)))
ioapic_service(ioapic, gsi);
}
}
void kvm_ioapic_update_eoi(struct kvm *kvm, int vector)
void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode)
{
struct kvm_ioapic *ioapic = kvm->arch.vioapic;
int i;
for (i = 0; i < IOAPIC_NUM_PINS; i++)
if (ioapic->redirtbl[i].fields.vector == vector)
__kvm_ioapic_update_eoi(ioapic, i);
__kvm_ioapic_update_eoi(ioapic, i, trigger_mode);
}
static int ioapic_in_range(struct kvm_io_device *this, gpa_t addr,