live migration: Allow cleanup after cancellation or error

Introduce qemu_savevm_state_cancel and inject a stage -1 to cancel a
live migration. This gives the involved subsystems a chance to clean up
dynamically allocated resources. Namely, the block migration layer can
now free its device descriptors and pending blocks.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/migration.c b/migration.c
index d7fb75676..f8a15fb48 100644
--- a/migration.c
+++ b/migration.c
@@ -324,6 +324,7 @@ void migrate_fd_cancel(MigrationState *mig_state)
     dprintf("cancelling migration\n");
 
     s->state = MIG_STATE_CANCELLED;
+    qemu_savevm_state_cancel(s->file);
 
     migrate_fd_cleanup(s);
 }