doc: virtio-gpu parameters of acrn-dm
Update parameters of virtio-gpu in acrn-dm-parameters.rst
@@ -474,6 +474,17 @@ arguments used for configuration. Here is a table describing these emulated dev
latter is ignored and the MAC address is set to the ``mac`` value.
``mac_seed`` will only be used when ``mac`` is not set.
+ * - ``virtio-gpu``
+ - Virtio GPU type device, parameters format is:
+ ``virtio-gpu[,geometry=<width>x<height>+<x_off>+<y_off> | fullscreen]``
+
+ * ``<geometry>`` specifies the mode of virtual display, windowed or fullscreen.
+ If it is not set, the virtual display will use 1280x720 resolution in windowed mode.
+ * ``width`` specifies the width of the virtual display window in pixels.
+ * ``height`` specifies the height of the virtual display window in pixels.
+ * ``x_off`` specifies the x offfset of the virtual display window from the upper-left corner of screen.
+ * ``y_off`` specifies the y offfset of the virtual display window from the upper-left corner of screen.
+
* - ``passthru``
- Indicates a passthrough device. Use the parameter with the format
``passthru,<bus>/<device>/<function>,<optional parameter>``
