migration/savevm: split qemu_savevm_state_complete_precopy() into two parts

This is a preparation patch for further cleanup.

No functional change, just wrap two major part of
qemu_savevm_state_complete_precopy() into function.
Signed-off-by: NWei Yang <richardw.yang@linux.intel.com>
Message-Id: <20190709140924.13291-3-richardw.yang@linux.intel.com>
Reviewed-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com>

migration/savevm.c

@@ -1246,23 +1246,12 @@ void qemu_savevm_state_complete_postcopy(QEMUFile *f)
     qemu_fflush(f);
 }
 
-int qemu_savevm_state_complete_precopy(QEMUFile *f, bool iterable_only,
-                                       bool inactivate_disks)
+static
+int qemu_savevm_state_complete_precopy_iterable(QEMUFile *f, bool in_postcopy,
+                                                bool iterable_only)
 {
-    QJSON *vmdesc;
-    int vmdesc_len;
     SaveStateEntry *se;
     int ret;
-    bool in_postcopy = migration_in_postcopy();
-    Error *local_err = NULL;
-
-    if (precopy_notify(PRECOPY_NOTIFY_COMPLETE, &local_err)) {
-        error_report_err(local_err);
-    }
-
-    trace_savevm_state_complete_precopy();
-
-    cpu_synchronize_all_states();
 
     QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
         if (!se->ops ||
@@ -1291,9 +1280,18 @@ int qemu_savevm_state_complete_precopy(QEMUFile *f, bool iterable_only,
         }
     }
 
-    if (iterable_only) {
-        goto flush;
-    }
+    return 0;
+}
+
+static
+int qemu_savevm_state_complete_precopy_non_iterable(QEMUFile *f,
+                                                    bool in_postcopy,
+                                                    bool inactivate_disks)
+{
+    QJSON *vmdesc;
+    int vmdesc_len;
+    SaveStateEntry *se;
+    int ret;
 
     vmdesc = qjson_new();
     json_prop_int(vmdesc, "page_size", qemu_target_page_size());
@@ -1353,6 +1351,40 @@ int qemu_savevm_state_complete_precopy(QEMUFile *f, bool iterable_only,
     }
     qjson_destroy(vmdesc);
 
+    return 0;
+}
+
+int qemu_savevm_state_complete_precopy(QEMUFile *f, bool iterable_only,
+                                       bool inactivate_disks)
+{
+    int ret;
+    Error *local_err = NULL;
+    bool in_postcopy = migration_in_postcopy();
+
+    if (precopy_notify(PRECOPY_NOTIFY_COMPLETE, &local_err)) {
+        error_report_err(local_err);
+    }
+
+    trace_savevm_state_complete_precopy();
+
+    cpu_synchronize_all_states();
+
+    ret = qemu_savevm_state_complete_precopy_iterable(f, in_postcopy,
+                                                      iterable_only);
+    if (ret) {
+        return ret;
+    }
+
+    if (iterable_only) {
+        goto flush;
+    }
+
+    ret = qemu_savevm_state_complete_precopy_non_iterable(f, in_postcopy,
+                                                          inactivate_disks);
+    if (ret) {
+        return ret;
+    }
+
 flush:
     qemu_fflush(f);
     return 0;