minios: Fix lost events

evtchn_bind_interdomain used to clear any already pending event before
binding a handler, because else the handler may be called before it is
ready. That however leads to missed events, which I had to workaround
for the HVM case.

This changes the semantics of bind_evtchn, and thus of all the
event channel binding functions (bind_virq, evtchn_alloc_unbound,
evtchn_bind_interdomain) into not unmasking the event itself, hence
letting the caller initialize properly before unmasking the port (e.g.
record the port number in an appropriate place).

Signed-off-by: Samuel Thibault <samuel.thibault@eu.citrix.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/extras/mini-os/console/xencons_ring.c b/extras/mini-os/console/xencons_ring.c
index f0cf9203ae..583e4bcb92 100644
--- a/extras/mini-os/console/xencons_ring.c
+++ b/extras/mini-os/console/xencons_ring.c
@@ -86,6 +86,7 @@ int xencons_ring_init(void)
 		printk("XEN console request chn bind failed %i\n", err);
 		return err;
 	}
+        unmask_evtchn(start_info.console.domU.evtchn);
 
 	/* In case we have in-flight data after save/restore... */
 	notify_daemon();