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| author | Gleb Natapov <gleb@redhat.com> | 2012-09-13 17:19:24 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2012-09-20 15:05:26 +0300 |
| commit | 1e08ec4a130e2745d96df169e67c58df98a07311 (patch) | |
| tree | 362647f5b0bac59e7fe93ce66775afac2cd7da79 /virt | |
| parent | 1d86b5cc4c6d9a1be1458be3701ac9c915a9706f (diff) | |
| download | lwn-1e08ec4a130e2745d96df169e67c58df98a07311.tar.gz lwn-1e08ec4a130e2745d96df169e67c58df98a07311.zip | |
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')
| -rw-r--r-- | virt/kvm/irq_comm.c | 7 |
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, 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)) |