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KVM: Report IRQ injection status to userspace.

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IRQ injection status is either -1 (if there was no CPU found
that should except the interrupt because IRQ was masked or
ioapic was misconfigured or ...) or >= 0 in that case the
number indicates to how many CPUs interrupt was injected.
If the value is 0 it means that the interrupt was coalesced
and probably should be reinjected.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov
2009-02-04 17:28:14 +02:00
committed by Avi Kivity
parent 452425dbaa
commit 4925663a07
9 changed files with 88 additions and 34 deletions
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23
virt/kvm/ioapic.c
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@ -83,19 +83,22 @@ static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
return result;
}
static void ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx)
static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx)
{
union ioapic_redir_entry *pent;
int injected = -1;
pent = &ioapic->redirtbl[idx];
if (!pent->fields.mask) {
int injected = ioapic_deliver(ioapic, idx);
injected = ioapic_deliver(ioapic, idx);
if (injected && pent->fields.trig_mode == IOAPIC_LEVEL_TRIG)
pent->fields.remote_irr = 1;
}
if (!pent->fields.trig_mode)
ioapic->irr &= ~(1 << idx);
return injected;
}
static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
@ -207,7 +210,7 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
u8 trig_mode = ioapic->redirtbl[irq].fields.trig_mode;
u32 deliver_bitmask;
struct kvm_vcpu *vcpu;
int vcpu_id, r = 0;
int vcpu_id, r = -1;
ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
"vector=%x trig_mode=%x\n",
@ -247,7 +250,9 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
deliver_bitmask &= ~(1 << vcpu_id);
vcpu = ioapic->kvm->vcpus[vcpu_id];
if (vcpu) {
r = ioapic_inj_irq(ioapic, vcpu, vector,
if (r < 0)
r = 0;
r += ioapic_inj_irq(ioapic, vcpu, vector,
trig_mode, delivery_mode);
}
}
@ -258,8 +263,10 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
continue;
deliver_bitmask &= ~(1 << vcpu_id);
vcpu = ioapic->kvm->vcpus[vcpu_id];
if (vcpu)
if (vcpu) {
ioapic_inj_nmi(vcpu);
r = 1;
}
else
ioapic_debug("NMI to vcpu %d failed\n",
vcpu->vcpu_id);
@ -273,11 +280,12 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
return r;
}
void kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
{
u32 old_irr = ioapic->irr;
u32 mask = 1 << irq;
union ioapic_redir_entry entry;
int ret = 1;
if (irq >= 0 && irq < IOAPIC_NUM_PINS) {
entry = ioapic->redirtbl[irq];
@ -288,9 +296,10 @@ void kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
ioapic->irr |= mask;
if ((!entry.fields.trig_mode && old_irr != ioapic->irr)
|| !entry.fields.remote_irr)
ioapic_service(ioapic, irq);
ret = ioapic_service(ioapic, irq);
}
}
return ret;
}
static void __kvm_ioapic_update_eoi(struct kvm_ioapic *ioapic, int pin,