[Xen-devel] [PATCH 2/2] xl: disable events earlier for shutdown event

[Wei Liu <wei.liu2@xxxxxxxxxx>]

We need to disable event machinery when the guest shuts down.  It
doesn't really matter where we disable it as long as it is within the
branch for shutdown event.

Move the code snippet before handle_domain_death, so that d_config is
not yet updated and we have the correct ->num_disks. And the free diskws
and set it to NULL, so that diskws gets automatically set up again when
xl goes over the domain creation code path.

Reported-by: Fatih Acar <fatih.acar@xxxxxxxxx>
Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Fatih Acar <fatih.acar@xxxxxxxxx>

Fatih, please test this series to see if it fixes your issue.

Ian, backport candidate?
---
 tools/libxl/xl_cmdimpl.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index 9bf10dfcb2..7df6db1ec9 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -3137,6 +3137,11 @@ start:
             LOG("Domain %u has shut down, reason code %d 0x%x", domid,
                 event->u.domain_shutdown.shutdown_reason,
                 event->u.domain_shutdown.shutdown_reason);
+            libxl_evdisable_domain_death(ctx, deathw);
+            deathw = NULL;
+            evdisable_disk_ejects(diskws, d_config.num_disks);
+            free(diskws);
+            diskws = NULL;
             switch (handle_domain_death(&domid, event, &d_config)) {
             case DOMAIN_RESTART_SOFT_RESET:
                 domid_soft_reset = domid;
@@ -3154,9 +3159,6 @@ start:
                 /* Otherwise fall through and restart. */
             case DOMAIN_RESTART_NORMAL:
                 libxl_event_free(ctx, event);
-                libxl_evdisable_domain_death(ctx, deathw);
-                deathw = NULL;
-                evdisable_disk_ejects(diskws, d_config.num_disks);
                 /* discard any other events which may have been generated */
                 while (!(ret = libxl_event_check(ctx, &event,
                                                  LIBXL_EVENTMASK_ALL, 0,0))) {
-- 
2.11.0


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