From dfd146fcae8974d40ef6dcfc047d7a1631e064d9 Mon Sep 17 00:00:00 2001
From: Wanpeng Li <wanpengli@tencent.com>
Date: Thu, 21 Nov 2019 11:17:12 +0800
Subject: [PATCH] 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>
---
arch/x86/kvm/irq_comm.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c
index 9d711c2451c79..79afa0bb5f410 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 == 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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