Signed-off-by: Juan Quintela <[email protected]>
---
docs/devel/migration.rst | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/docs/devel/migration.rst b/docs/devel/migration.rst
index c3e1400c0c..a9fde75862 100644
--- a/docs/devel/migration.rst
+++ b/docs/devel/migration.rst
@@ -165,13 +165,17 @@ An example (from hw/input/pckbd.c)
}
};
-We are declaring the state with name "pckbd".
-The ``version_id`` is 3, and the fields are 4 uint8_t in a KBDState structure.
-We registered this with:
+We are declaring the state with name "pckbd". The ``version_id`` is
+3, and the fields are 4 uint8_t in a KBDState structure. We
+registered this with one of those. The first one will generate a
+device ``instance_id`` different for each registration. Use the
+second one if you already have an id different for each instance of
+the device:
.. code:: c
- vmstate_register(NULL, 0, &vmstate_kbd, s);
+ vmstate_register_any(NULL, &vmstate_kbd, s);
+ vmstate_register(NULL, instance_id, &vmstate_kbd, s);
For devices that are ``qdev`` based, we can register the device in the class
init function:
--
2.41.0
