Re: [RFC PATCH 2/2] virtio-gpu: Add an option to connect all outputs on startup

[Damian Hobson-Garcia]

On 2023/03/08 11:25, Damian Hobson-Garcia wrote:
> When multiple outputs are enabled using the "max_outputs" attribute,
> only the first connector appears as "Connected" in the guest DRM
> device.  Additional connectors must be enabled from the host side
> UI frontend before they are usable by the guest.  However, multiple
> outputs can still be of use on a headless configuration, if for example,
> the display will only be used for taking periodic screenshots in the
> guest or integration into a CI pipeline, etc.
>
> Add an option to start all of the outputs in the "Connected" state,
> so that they are immediately available to the guest.

I was also thinking that since the main application for this is headless 
configurations, it could be possible to implement this in
ui/egl-headless.c.

Calling dpy_set_ui_info() for each console during initialization is 
enough to enable the outputs, but then there is the question of what 
resolution to pass in the ui_info. Hardcoded? Add a new option to the 
`egl-headless` display property?

Are there any thoughts on this approach vs. addressing this at the 
display driver (virtio-gpu) level?

Thank you,
Damian