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KVM: LAPIC: micro-optimize fixed mode ipi delivery 

This patch optimizes redundancy logic before fixed mode ipi is delivered
in the fast path, broadcast handling needs to go slow path, so the delivery
mode repair can be delayed to before slow path.

Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Wanpeng Li 2019-11-21 11:17:12 +08:00 committed by Paolo Bonzini
parent 1e9e2622a1
commit dfd146fcae
1 changed files with 3 additions and 3 deletions
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6
arch/x86/kvm/irq_comm.c
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@ -52,15 +52,15 @@ int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
unsigned long dest_vcpu_bitmap[BITS_TO_LONGS(KVM_MAX_VCPUS)];
unsigned int dest_vcpus = 0;
if (kvm_irq_delivery_to_apic_fast(kvm, src, irq, &r, dest_map))
return r;
if (irq->dest_mode == APIC_DEST_PHYSICAL &&
irq->dest_id == 0xff && kvm_lowest_prio_delivery(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, dest_map))
return r;
memset(dest_vcpu_bitmap, 0, sizeof(dest_vcpu_bitmap));
kvm_for_each_vcpu(i, vcpu, kvm) {