[PATCH v3 2/8] migration/savevm: Prepare vmdesc json writer in qemu_savevm_state_setup()

[David Hildenbrand <david@redhat.com>]

... and store it in the migration state. This is a preparation for
storing selected vmds's already in qemu_savevm_state_setup().

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 migration/migration.c |  4 ++++
 migration/migration.h |  4 ++++
 migration/savevm.c    | 18 ++++++++++++------
 3 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/migration/migration.c b/migration/migration.c
index 52b5d39244..1d33a7efa0 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -2170,6 +2170,9 @@ void migrate_init(MigrationState *s)
     s->vm_was_running = false;
     s->iteration_initial_bytes = 0;
     s->threshold_size = 0;
+
+    json_writer_free(s->vmdesc);
+    s->vmdesc = NULL;
 }
 
 int migrate_add_blocker_internal(Error *reason, Error **errp)
@@ -4445,6 +4448,7 @@ static void migration_instance_finalize(Object *obj)
     qemu_sem_destroy(&ms->rp_state.rp_sem);
     qemu_sem_destroy(&ms->postcopy_qemufile_src_sem);
     error_free(ms->error);
+    json_writer_free(ms->vmdesc);
 }
 
 static void migration_instance_init(Object *obj)
diff --git a/migration/migration.h b/migration/migration.h
index ae4ffd3454..66511ce532 100644
--- a/migration/migration.h
+++ b/migration/migration.h
@@ -17,6 +17,7 @@
 #include "exec/cpu-common.h"
 #include "hw/qdev-core.h"
 #include "qapi/qapi-types-migration.h"
+#include "qapi/qmp/json-writer.h"
 #include "qemu/thread.h"
 #include "qemu/coroutine_int.h"
 #include "io/channel.h"
@@ -366,6 +367,9 @@ struct MigrationState {
      * This save hostname when out-going migration starts
      */
     char *hostname;
+
+    /* QEMU_VM_VMDESCRIPTION content filled for all non-iterable devices. */
+    JSONWriter *vmdesc;
 };
 
 void migrate_set_state(int *state, int old_state, int new_state);
diff --git a/migration/savevm.c b/migration/savevm.c
index d8830297e4..ff2b8d0064 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"
@@ -1189,10 +1188,16 @@ 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) {
@@ -1390,15 +1395,12 @@ 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) {
@@ -1433,6 +1435,10 @@ 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;
 }
 
-- 
2.39.0