KVM: LAPIC: micro-optimize fixed mode ipi delivery (dfd146fc) · Commits · 戴 / test

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>

arch/x86/kvm/irq_comm.c

+3 −3

Original line number	Diff line number	Diff line
		@@ -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) {

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