[Xen-devel] [PATCH 15/18] xenpaging: handle dying guest in notify_via_xen_event_channel

[Olaf Hering <olaf@xxxxxxxxx>]

Avoid crash of Xen if a xenpaging enabled guest crashes and there are still
memevents in flight, as reported here:

http://lists.xensource.com/archives/html/xen-devel/2010-08/msg00516.html

Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
Already-Acked-by: Patrick Colp <pjcolp@xxxxxxxxx>
Already-Acked-by: Keir Fraser <keir.fraser@xxxxxxxxxx>

---
 xen/common/event_channel.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- xen-4.0.1-testing.orig/xen/common/event_channel.c
+++ xen-4.0.1-testing/xen/common/event_channel.c
@@ -994,6 +994,12 @@ void notify_via_xen_event_channel(struct
 
     spin_lock(&ld->event_lock);
 
+    if ( unlikely(ld->is_dying) )
+    {
+        spin_unlock(&ld->event_lock);
+        return;
+    }
+
     ASSERT(port_is_valid(ld, lport));
     lchn = evtchn_from_port(ld, lport);
     ASSERT(lchn->consumer_is_xen);


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