commit b6958ce44a11a9e9425d2b67a653b1ca2a27796f
author Eddie Dong <eddie.dong@intel.com> Wed Jul 18 12:15:21 2007 +0300
committer Avi Kivity <avi@qumranet.com> Sat Oct 13 10:18:25 2007 +0200
tree 503478ef27254df9b6ea21d2a6a279a7dfe2ef04
parent 1fd4f2a5ed8f80cf6e23d2bdf78554f6a1ac7997

KVM: Emulate hlt in the kernel

By sleeping in the kernel when hlt is executed, we simplify the in-kernel
guest interrupt path considerably.

Signed-off-by: Gregory Haskins <ghaskins@novell.com>
Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

drivers/kvm/irq.c

diff --git a/drivers/kvm/irq.c b/drivers/kvm/irq.c
index 5265f82..e09cd65 100644
--- a/drivers/kvm/irq.c
+++ b/drivers/kvm/irq.c
@@ -70,6 +70,10 @@
 {
 	int ipi_pcpu = vcpu->cpu;
 
+	if (waitqueue_active(&vcpu->wq)) {
+		wake_up_interruptible(&vcpu->wq);
+		++vcpu->stat.halt_wakeup;
+	}
 	if (vcpu->guest_mode)
 		smp_call_function_single(ipi_pcpu, vcpu_kick_intr, vcpu, 0, 0);
 }