From: Jason Wang <jasowang@redhat.com>
Date: Fri, 27 Aug 2010 09:15:06 +0000 (+0800)
Subject: KVM: pit: Do not check pending pit timer in vcpu thread
X-Git-Tag: firefly_0821_release~7613^2~3665^2~131
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=23e7a7944f3779155e2f6bbc831b544eb925f387;p=firefly-linux-kernel-4.4.55.git

KVM: pit: Do not check pending pit timer in vcpu thread

Pit interrupt injection was done by workqueue, so no need to check
pending pit timer in vcpu thread which could lead unnecessary
unblocking of vcpu.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
---

diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c
index ddeb2314b522..2ad40a4ddc34 100644
--- a/arch/x86/kvm/i8254.c
+++ b/arch/x86/kvm/i8254.c
@@ -232,15 +232,6 @@ static void pit_latch_status(struct kvm *kvm, int channel)
 	}
 }
 
-int pit_has_pending_timer(struct kvm_vcpu *vcpu)
-{
-	struct kvm_pit *pit = vcpu->kvm->arch.vpit;
-
-	if (pit && kvm_vcpu_is_bsp(vcpu) && pit->pit_state.irq_ack)
-		return atomic_read(&pit->pit_state.pit_timer.pending);
-	return 0;
-}
-
 static void kvm_pit_ack_irq(struct kvm_irq_ack_notifier *kian)
 {
 	struct kvm_kpit_state *ps = container_of(kian, struct kvm_kpit_state,
diff --git a/arch/x86/kvm/irq.c b/arch/x86/kvm/irq.c
index 2095a049835e..f994da40ad94 100644
--- a/arch/x86/kvm/irq.c
+++ b/arch/x86/kvm/irq.c
@@ -33,12 +33,7 @@
  */
 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 {
-	int ret;
-
-	ret = pit_has_pending_timer(vcpu);
-	ret |= apic_has_pending_timer(vcpu);
-
-	return ret;
+	return apic_has_pending_timer(vcpu);
 }
 EXPORT_SYMBOL(kvm_cpu_has_pending_timer);