diff options
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/devel/migration.rst | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/docs/devel/migration.rst b/docs/devel/migration.rst index be913630c3..240eb16d90 100644 --- a/docs/devel/migration.rst +++ b/docs/devel/migration.rst @@ -167,13 +167,17 @@ 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 there are 4 uint8_t fields in the KBDState structure. We +registered this ``VMSTATEDescription`` with one of the following +functions. The first one will generate a device ``instance_id`` +different for each registration. Use the second one if you already +have an id that is 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: |