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-rw-r--r--migration/savevm.c18
1 files changed, 12 insertions, 6 deletions
diff --git a/migration/savevm.c b/migration/savevm.c
index 3e3631652e..28f88b5521 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -42,7 +42,6 @@
 #include "postcopy-ram.h"
 #include "qapi/error.h"
 #include "qapi/qapi-commands-migration.h"
-#include "qapi/qmp/json-writer.h"
 #include "qapi/clone-visitor.h"
 #include "qapi/qapi-builtin-visit.h"
 #include "qapi/qmp/qerror.h"
@@ -1190,10 +1189,16 @@ bool qemu_savevm_state_guest_unplug_pending(void)
 
 void qemu_savevm_state_setup(QEMUFile *f)
 {
+    MigrationState *ms = migrate_get_current();
     SaveStateEntry *se;
     Error *local_err = NULL;
     int ret;
 
+    ms->vmdesc = json_writer_new(false);
+    json_writer_start_object(ms->vmdesc, NULL);
+    json_writer_int64(ms->vmdesc, "page_size", qemu_target_page_size());
+    json_writer_start_array(ms->vmdesc, "devices");
+
     trace_savevm_state_setup();
     QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
         if (!se->ops || !se->ops->save_setup) {
@@ -1391,15 +1396,12 @@ int qemu_savevm_state_complete_precopy_non_iterable(QEMUFile *f,
                                                     bool in_postcopy,
                                                     bool inactivate_disks)
 {
-    g_autoptr(JSONWriter) vmdesc = NULL;
+    MigrationState *ms = migrate_get_current();
+    JSONWriter *vmdesc = ms->vmdesc;
     int vmdesc_len;
     SaveStateEntry *se;
     int ret;
 
-    vmdesc = json_writer_new(false);
-    json_writer_start_object(vmdesc, NULL);
-    json_writer_int64(vmdesc, "page_size", qemu_target_page_size());
-    json_writer_start_array(vmdesc, "devices");
     QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
         ret = vmstate_save(f, se, vmdesc);
         if (ret) {
@@ -1434,6 +1436,10 @@ int qemu_savevm_state_complete_precopy_non_iterable(QEMUFile *f,
         qemu_put_buffer(f, (uint8_t *)json_writer_get(vmdesc), vmdesc_len);
     }
 
+    /* Free it now to detect any inconsistencies. */
+    json_writer_free(vmdesc);
+    ms->vmdesc = NULL;
+
     return 0;
 }