[Qemu-trivial] [PATCH 1/1] arm: virt: change GPIO trigger interrupt to pulse

[Wei Huang <wei@redhat.com>]

When QEMU is hook'ed up with libvirt/virsh, the first ACPI reboot
request will succeed; but the following shutdown/reboot requests
fail to trigger VMs to react. Notice that in mach-virt machine
model GPIO is defined as edge-triggered and active-high in ACPI.
This patch changes the behavior of powerdown notifier from PULLUP
to PULSE. It solves the problem described above (i.e. reboot
continues to work).

Signed-off-by: Wei Huang <wei@redhat.com>
---
 hw/arm/virt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 05f9087..b5468a9 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -546,7 +546,7 @@ static DeviceState *pl061_dev;
 static void virt_powerdown_req(Notifier *n, void *opaque)
 {
     /* use gpio Pin 3 for power button event */
-    qemu_set_irq(qdev_get_gpio_in(pl061_dev, 3), 1);
+    qemu_irq_pulse(qdev_get_gpio_in(pl061_dev, 3));
 }
 
 static Notifier virt_system_powerdown_notifier = {
-- 
1.8.3.1