Finish non-postcopiable iterative devices before package

Where we have iterable, but non-postcopiable devices (e.g. htab
or block migration), complete them before forming the 'package'
but with the CPUs stopped.  This stops them filling up the package.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/migration/savevm.c b/migration/savevm.c
index be52314a12..d90e228568 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -1026,7 +1026,7 @@ void qemu_savevm_state_complete_postcopy(QEMUFile *f)
     qemu_fflush(f);
 }
 
-void qemu_savevm_state_complete_precopy(QEMUFile *f)
+void qemu_savevm_state_complete_precopy(QEMUFile *f, bool iterable_only)
 {
     QJSON *vmdesc;
     int vmdesc_len;
@@ -1041,9 +1041,11 @@ void qemu_savevm_state_complete_precopy(QEMUFile *f)
     QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
         if (!se->ops ||
             (in_postcopy && se->ops->save_live_complete_postcopy) ||
+            (in_postcopy && !iterable_only) ||
             !se->ops->save_live_complete_precopy) {
             continue;
         }
+
         if (se->ops && se->ops->is_active) {
             if (!se->ops->is_active(se->opaque)) {
                 continue;
@@ -1062,6 +1064,10 @@ void qemu_savevm_state_complete_precopy(QEMUFile *f)
         }
     }
 
+    if (iterable_only) {
+        return;
+    }
+
     vmdesc = qjson_new();
     json_prop_int(vmdesc, "page_size", TARGET_PAGE_SIZE);
     json_start_array(vmdesc, "devices");
@@ -1176,7 +1182,7 @@ static int qemu_savevm_state(QEMUFile *f, Error **errp)
 
     ret = qemu_file_get_error(f);
     if (ret == 0) {
-        qemu_savevm_state_complete_precopy(f);
+        qemu_savevm_state_complete_precopy(f, false);
         ret = qemu_file_get_error(f);
     }
     qemu_savevm_state_cleanup();