Introduce a special state to indicate when an object doesn't
have anything in its state to migrate.
Suggested-by: Peter Maydell <peter.mayd...@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4...@amsat.org>
---
include/migration/vmstate.h | 1 +
migration/vmstate.c | 7 +++++++
2 files changed, 8 insertions(+)
diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index af7d80cd4e..0922bc8efa 100644
--- a/include/migration/vmstate.h
+++ b/include/migration/vmstate.h
@@ -195,6 +195,7 @@ struct VMStateDescription {
};
extern const VMStateDescription vmstate_dummy; /* Exclusively for linux-user */
+extern const VMStateDescription vmstate_no_state_to_migrate;
extern const VMStateInfo vmstate_info_bool;
diff --git a/migration/vmstate.c b/migration/vmstate.c
index bafa890384..d640cafad3 100644
--- a/migration/vmstate.c
+++ b/migration/vmstate.c
@@ -20,6 +20,13 @@
#include "trace.h"
#include "qjson.h"
+const VMStateDescription vmstate_no_state_to_migrate = {
+ .name = "empty-state",
+ .fields = (VMStateField[]) {
+ VMSTATE_END_OF_LIST()
+ }
+};
+
static int vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
void *opaque, QJSON *vmdesc);
static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
--
2.21.3
