[PATCH qemu-server] fix vm shutdown when agent conf is enabled but is not running in the vm

[Fabio Fantoni]

Checking only vm configuration for choose the shutdown method causes it
to always fail, after reaching the timeout, if the qemu agent option in
the vm configuration is enabled but the agent is not installed and
active in the guest.
As I seen in the windows vm the agent also crashes in some cases, so
shutdown don't fail only if qemu guest agent is not installed or not
started.

Added check that agent is active when choosing agent shutdown method to
avoid certain shutdown failure in those cases.

Signed-off-by: Fabio Fantoni <fabio.fantoni at m2r.biz>
---
 PVE/QemuServer.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index 2046a7c..4b6aac7 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -6341,7 +6341,7 @@ sub _do_vm_stop {
 
     eval {
 	if ($shutdown) {
-	    if (defined($conf) && get_qga_key($conf, 'enabled')) {
+	    if (defined($conf) && get_qga_key($conf, 'enabled') && qga_check_running($vmid, 1)) {
 		mon_cmd($vmid, "guest-shutdown", timeout => $timeout);
 	    } else {
 		mon_cmd($vmid, "system_powerdown");
-- 
2.25.1