path: root/virt
diff options
authorGleb Natapov <gleb@redhat.com>2012-09-13 17:19:24 +0300
committerAvi Kivity <avi@redhat.com>2012-09-20 15:05:26 +0300
commit1e08ec4a130e2745d96df169e67c58df98a07311 (patch)
tree362647f5b0bac59e7fe93ce66775afac2cd7da79 /virt
parent1d86b5cc4c6d9a1be1458be3701ac9c915a9706f (diff)
KVM: optimize apic interrupt delivery
Most interrupt are delivered to only one vcpu. Use pre-build tables to find interrupt destination instead of looping through all vcpus. In case of logical mode loop only through vcpus in a logical cluster irq is sent to. Signed-off-by: Gleb Natapov <gleb@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'virt')
1 files changed, 6 insertions, 1 deletions
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index 7118be0f2f2..3ca89c451d6 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -68,8 +68,13 @@ int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
struct kvm_vcpu *vcpu, *lowest = NULL;
if (irq->dest_mode == 0 && irq->dest_id == 0xff &&
- kvm_is_dm_lowest_prio(irq))
+ kvm_is_dm_lowest_prio(irq)) {
printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
+ irq->delivery_mode = APIC_DM_FIXED;
+ }
+ if (kvm_irq_delivery_to_apic_fast(kvm, src, irq, &r))
+ return r;
kvm_for_each_vcpu(i, vcpu, kvm) {
if (!kvm_apic_present(vcpu))