diff mbox series

[v2,2/2] KVM: LAPIC: micro-optimize fixed mode ipi delivery

Message ID 1574145505-12273-1-git-send-email-wanpengli@tencent.com (mailing list archive)
State New, archived
Headers show
Series [v2,1/2] KVM: VMX: FIXED+PHYSICAL mode single target IPI fastpath | expand

Commit Message

Wanpeng Li Nov. 19, 2019, 6:38 a.m. UTC 
From: Wanpeng Li <wanpengli@tencent.com>

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>
---
v1 -> v2:
 * don't touch the irq->shorthand check

 arch/x86/kvm/irq_comm.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c
index 8ecd48d..aa88156 100644
--- a/arch/x86/kvm/irq_comm.c
+++ b/arch/x86/kvm/irq_comm.c
@@ -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 == 0 && 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) {