1 files changed, 15 insertions, 1 deletions
diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index ad24aa1934..64680d824e 100644
--- a/include/migration/vmstate.h
+++ b/include/migration/vmstate.h
@@ -178,7 +178,21 @@ struct VMStateField {
 
 struct VMStateDescription {
     const char *name;
-    int unmigratable;
+    bool unmigratable;
+    /*
+     * This VMSD describes something that should be sent during setup phase
+     * of migration. It plays similar role as save_setup() for explicitly
+     * registered vmstate entries, so it can be seen as a way to describe
+     * save_setup() in VMSD structures.
+     *
+     * Note that for now, a SaveStateEntry cannot have a VMSD and
+     * operations (e.g., save_setup()) set at the same time. Consequently,
+     * save_setup() and a VMSD with early_setup set to true are mutually
+     * exclusive. For this reason, also early_setup VMSDs are migrated in a
+     * QEMU_VM_SECTION_FULL section, while save_setup() data is migrated in
+     * a QEMU_VM_SECTION_START section.
+     */
+    bool early_setup;
     int version_id;
     int minimum_version_id;
     MigrationPriority priority;