KVM: Move apic timer interrupt backlog processing to common code

Beside the obvious goodness of making code more common, this prevents
a livelock with the next patch which moves interrupt injection out of the
critical section.
Signed-off-by: Avi Kivity <avi@qumranet.com>

drivers/kvm/kvm_main.c

@@ -2144,6 +2144,8 @@ again:
 	if (unlikely(r))
 		goto out;
 
+	kvm_inject_pending_timer_irqs(vcpu);
+
 	preempt_disable();
 
 	kvm_x86_ops->prepare_guest_switch(vcpu);

drivers/kvm/svm.c

@@ -1355,7 +1355,6 @@ static void svm_intr_assist(struct kvm_vcpu *vcpu)
 	struct vmcb *vmcb = svm->vmcb;
 	int intr_vector = -1;
 
-	kvm_inject_pending_timer_irqs(vcpu);
 	if ((vmcb->control.exit_int_info & SVM_EVTINJ_VALID) &&
 	    ((vmcb->control.exit_int_info & SVM_EVTINJ_TYPE_MASK) == 0)) {
 		intr_vector = vmcb->control.exit_int_info &

drivers/kvm/vmx.c

@@ -2191,7 +2191,6 @@ static void vmx_intr_assist(struct kvm_vcpu *vcpu)
 	int has_ext_irq, interrupt_window_open;
 	int vector;
 
-	kvm_inject_pending_timer_irqs(vcpu);
 	update_tpr_threshold(vcpu);
 
 	has_ext_irq = kvm_cpu_has_interrupt(vcpu);