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authorAvi Kivity <avi@redhat.com>2009-12-28 14:08:30 +0200
committerMarcelo Tosatti <mtosatti@redhat.com>2010-03-01 12:35:46 -0300
commit46a929bc15fcd48e1e0e770a44040a6949cae133 (patch)
tree5351d75586821e74d82c59f1e1cde10806a25237
parentf4c9e87c83a9f5bc1800db27dbb39e5cd1254c0a (diff)
KVM: avoid taking ioapic mutex for non-ioapic EOIs
When the guest acknowledges an interrupt, it sends an EOI message to the local apic, which broadcasts it to the ioapic. To handle the EOI, we need to take the ioapic mutex. On large guests, this causes a lot of contention on this mutex. Since large guests usually don't route interrupts via the ioapic (they use msi instead), this is completely unnecessary. Avoid taking the mutex by introducing a handled_vectors bitmap. Before taking the mutex, check if the ioapic was actually responsible for the acked vector. If not, we can return early. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
-rw-r--r--virt/kvm/ioapic.c19
-rw-r--r--virt/kvm/ioapic.h1
2 files changed, 20 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;
}
diff --git a/virt/kvm/ioapic.h b/virt/kvm/ioapic.h
index 419c43b667a..a505ce9054f 100644
--- a/virt/kvm/ioapic.h
+++ b/virt/kvm/ioapic.h
@@ -46,6 +46,7 @@ struct kvm_ioapic {
struct kvm *kvm;
void (*ack_notifier)(void *opaque, int irq);
struct mutex lock;
+ DECLARE_BITMAP(handled_vectors, 256);
};
#ifdef DEBUG