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Diffstat (limited to 'virt/kvm/ioapic.c')
-rw-r--r--virt/kvm/ioapic.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index f01392f51e8..a2edfd177fa 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -100,6 +100,19 @@ static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx)
return injected;
}
+static void update_handled_vectors(struct kvm_ioapic *ioapic)
+{
+ DECLARE_BITMAP(handled_vectors, 256);
+ int i;
+
+ memset(handled_vectors, 0, sizeof(handled_vectors));
+ for (i = 0; i < IOAPIC_NUM_PINS; ++i)
+ __set_bit(ioapic->redirtbl[i].fields.vector, handled_vectors);
+ memcpy(ioapic->handled_vectors, handled_vectors,
+ sizeof(handled_vectors));
+ smp_wmb();
+}
+
static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
{
unsigned index;
@@ -134,6 +147,7 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
e->bits |= (u32) val;
e->fields.remote_irr = 0;
}
+ update_handled_vectors(ioapic);
mask_after = e->fields.mask;
if (mask_before != mask_after)
kvm_fire_mask_notifiers(ioapic->kvm, index, mask_after);
@@ -241,6 +255,9 @@ void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode)
{
struct kvm_ioapic *ioapic = kvm->arch.vioapic;
+ smp_rmb();
+ if (!test_bit(vector, ioapic->handled_vectors))
+ return;
mutex_lock(&ioapic->lock);
__kvm_ioapic_update_eoi(ioapic, vector, trigger_mode);
mutex_unlock(&ioapic->lock);
@@ -352,6 +369,7 @@ void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
ioapic->ioregsel = 0;
ioapic->irr = 0;
ioapic->id = 0;
+ update_handled_vectors(ioapic);
}
static const struct kvm_io_device_ops ioapic_mmio_ops = {
@@ -401,6 +419,7 @@ int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
mutex_lock(&ioapic->lock);
memcpy(ioapic, state, sizeof(struct kvm_ioapic_state));
+ update_handled_vectors(ioapic);
mutex_unlock(&ioapic->lock);
return 0;
}