From 1e08ec4a130e2745d96df169e67c58df98a07311 Mon Sep 17 00:00:00 2001 From: Gleb Natapov Date: Thu, 13 Sep 2012 17:19:24 +0300 Subject: 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 Acked-by: Michael S. Tsirkin Signed-off-by: Avi Kivity --- virt/kvm/irq_comm.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'virt/kvm/irq_comm.c') 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)) -- cgit v1.2.3