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authorGleb Natapov <gleb@redhat.com>2012-09-13 10:19:24 -0400
committerAvi Kivity <avi@redhat.com>2012-09-20 08:05:26 -0400
commit1e08ec4a130e2745d96df169e67c58df98a07311 (patch)
tree362647f5b0bac59e7fe93ce66775afac2cd7da79 /virt/kvm
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/kvm')
-rw-r--r--virt/kvm/irq_comm.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index 7118be0f2f2c..3ca89c451d6b 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,
68 struct kvm_vcpu *vcpu, *lowest = NULL; 68 struct kvm_vcpu *vcpu, *lowest = NULL;
69 69
70 if (irq->dest_mode == 0 && irq->dest_id == 0xff && 70 if (irq->dest_mode == 0 && irq->dest_id == 0xff &&
71 kvm_is_dm_lowest_prio(irq)) 71 kvm_is_dm_lowest_prio(irq)) {
72 printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n"); 72 printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
73 irq->delivery_mode = APIC_DM_FIXED;
74 }
75
76 if (kvm_irq_delivery_to_apic_fast(kvm, src, irq, &r))
77 return r;
73 78
74 kvm_for_each_vcpu(i, vcpu, kvm) { 79 kvm_for_each_vcpu(i, vcpu, kvm) {
75 if (!kvm_apic_present(vcpu)) 80 if (!kvm_apic_present(vcpu))