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[Xen-devel] [PATCH 15/18] xenpaging: handle dying guest in notify_via_xe
| To: | xen-devel@xxxxxxxxxxxxxxxxxxx |
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| Subject: | [Xen-devel] [PATCH 15/18] xenpaging: handle dying guest in notify_via_xen_event_channel |
| From: | Olaf Hering <olaf@xxxxxxxxx> |
| Date: | Fri, 15 Oct 2010 16:12:17 +0200 |
| Delivery-date: | Fri, 15 Oct 2010 07:28:19 -0700 |
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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); _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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