[PATCH] KVM: pit: Do not check pending pit timer in vcpu thread

[Jason Wang <jasowang@redhat.com>]

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>
---
 arch/x86/kvm/i8254.c |    9 ---------
 arch/x86/kvm/irq.c   |    7 +------
 2 files changed, 1 insertions(+), 15 deletions(-)

diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c
index ddeb231..2ad40a4 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 2095a04..f994da4 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);