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[PULL,1/7] migration: set state to post-migrate on failure

Message ID 42da5550d6d44ea0a5e36925deba1e1b13041f42.1469174334.git.amit.shah@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Amit Shah July 22, 2016, 8 a.m. UTC 
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

If a migration fails/is cancelled during the postcopy stage we currently
end up with the runstate as finish-migrate, where it should be post-migrate.
There's a small window in precopy where I think the same thing can
happen, but I've never seen it.

It rarely matters; the only postcopy case is if you restart a migration, which
again is a case that rarely matters in postcopy because it's only
safe to restart the migration if you know the destination hasn't
been running (which you might if you started the destination with -S
and hadn't got around to 'c' ing it before the postcopy failed).
Even then it's a small window but potentially you could hit if
there's a problem loading the devices on the destination.

This corresponds to:
https://bugzilla.redhat.com/show_bug.cgi?id=1355683

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Message-Id: <1468601086-32117-1-git-send-email-dgilbert@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
---
 migration/migration.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox

Patch

diff --git a/migration/migration.c b/migration/migration.c
index c4e0193..955d5ee 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1837,6 +1837,10 @@  static void *migration_thread(void *opaque)
     } else {
         if (old_vm_running && !entered_postcopy) {
             vm_start();
+        } else {
+            if (runstate_check(RUN_STATE_FINISH_MIGRATE)) {
+                runstate_set(RUN_STATE_POSTMIGRATE);
+            }
         }
     }
     qemu_bh_schedule(s->cleanup_bh);