[RFC V2 2/8] migration: cpr setup notifier

[Steve Sistare <steven.sistare@oracle.com>]

Call MIG_EVENT_PRECOPY_SETUP earlier, before CPR starts.  An early notifier
is needed for resetting vhost devices, as explained in the next patch.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
---
 migration/migration.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/migration/migration.c b/migration/migration.c
index 2efe60a..49d1e7d 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -2259,7 +2259,14 @@ void qmp_migrate(const char *uri, bool has_channels,
         stopped = true;
     }
 
+    /* Notify before starting migration thread, and before starting cpr */
+    if (!resume_requested &&
+        migration_call_notifiers(s, MIG_EVENT_PRECOPY_SETUP, &local_err)) {
+        goto out;
+    }
+
     if (cpr_state_save(cpr_channel, &local_err)) {
+        migration_call_notifiers(s, MIG_EVENT_PRECOPY_FAILED, NULL);
         goto out;
     }
 
@@ -4010,11 +4017,6 @@ void migration_connect(MigrationState *s, Error *error_in)
     } else {
         /* This is a fresh new migration */
         rate_limit = migrate_max_bandwidth();
-
-        /* Notify before starting migration thread */
-        if (migration_call_notifiers(s, MIG_EVENT_PRECOPY_SETUP, &local_err)) {
-            goto fail;
-        }
     }
 
     migration_rate_set(rate_limit);
-- 
1.8.3.1