[Qemu-devel] [PULL 01/15] migration: delay postcopy paused state

["Dr. David Alan Gilbert (git)" <dgilbert@redhat.com>]

From: Peter Xu <peterx@redhat.com>

Before this patch we firstly setup the postcopy-paused state then we
clean up the QEMUFile handles.  That can be racy if there is a very fast
"migrate-recover" command running in parallel.  Fix that up.

Reported-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20180627132246.5576-2-peterx@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
 migration/savevm.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/migration/savevm.c b/migration/savevm.c
index c2f34ffc7c..851d74e8b6 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -2194,9 +2194,6 @@ static bool postcopy_pause_incoming(MigrationIncomingState *mis)
     /* Clear the triggered bit to allow one recovery */
     mis->postcopy_recover_triggered = false;
 
-    migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
-                      MIGRATION_STATUS_POSTCOPY_PAUSED);
-
     assert(mis->from_src_file);
     qemu_file_shutdown(mis->from_src_file);
     qemu_fclose(mis->from_src_file);
@@ -2209,6 +2206,9 @@ static bool postcopy_pause_incoming(MigrationIncomingState *mis)
     mis->to_src_file = NULL;
     qemu_mutex_unlock(&mis->rp_mutex);
 
+    migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
+                      MIGRATION_STATUS_POSTCOPY_PAUSED);
+
     /* Notify the fault thread for the invalidated file handle */
     postcopy_fault_thread_notify(mis);
 
-- 
2.17.1