[PATCH V3 10/16] migration: split qmp_migrate

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

Split qmp_migrate into start and finish functions.  Finish will be
called asynchronously in a subsequent patch, but for now, call it
immediately.  No functional change.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
---
 migration/migration.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/migration/migration.c b/migration/migration.c
index 6dc7c09..86b3f39 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1521,6 +1521,7 @@ static void migrate_fd_error(MigrationState *s, const Error *error)
 static void migrate_fd_cancel(MigrationState *s)
 {
     int old_state ;
+    bool setup = (s->state == MIGRATION_STATUS_SETUP);
 
     trace_migrate_fd_cancel();
 
@@ -1565,6 +1566,15 @@ static void migrate_fd_cancel(MigrationState *s)
             s->block_inactive = false;
         }
     }
+
+    /*
+     * If qmp_migrate_finish has not been called, then there is no path that
+     * will complete the cancellation.  Do it now.
+     */
+    if (setup && !s->to_dst_file) {
+        migrate_set_state(&s->state, s->state, MIGRATION_STATUS_CANCELLED);
+        vm_resume(s->vm_old_state);
+    }
 }
 
 void migration_add_notifier_mode(NotifierWithReturn *notify,
@@ -2072,6 +2082,9 @@ static bool migrate_prepare(MigrationState *s, bool resume, Error **errp)
     return true;
 }
 
+static void qmp_migrate_finish(MigrationAddress *addr, bool resume_requested,
+                               Error **errp);
+
 void qmp_migrate(const char *uri, bool has_channels,
                  MigrationChannelList *channels, bool has_detach, bool detach,
                  bool has_resume, bool resume, Error **errp)
@@ -2118,6 +2131,20 @@ void qmp_migrate(const char *uri, bool has_channels,
         return;
     }
 
+    qmp_migrate_finish(addr, resume_requested, errp);
+
+    if (local_err) {
+        migrate_fd_error(s, local_err);
+        error_propagate(errp, local_err);
+    }
+}
+
+static void qmp_migrate_finish(MigrationAddress *addr, bool resume_requested,
+                               Error **errp)
+{
+    MigrationState *s = migrate_get_current();
+    Error *local_err = NULL;
+
     if (!resume_requested) {
         if (!yank_register_instance(MIGRATION_YANK_INSTANCE, errp)) {
             return;
-- 
1.8.3.1