[PATCH v2 07/11] video/aperture: Disable and unregister sysfb devices via aperture helpers

[Javier Martinez Canillas]

Samuel Čavoj <samuel at cavoj.net> writes:

[...]

>>>> This call to sysfb_disable() has been causing trouble with regard to
>>>> VFIO. VFIO has been calling aperture_remove_conflicting_pci_devices 
>>>> to
>>>> get rid of any console drivers (d173780620792c) using the device in
>>>> question, but now even unrelated drivers are getting killed. Example
>>>> situation:
>>> 
>>> Which drivers do you use?
>
> This happens with either no drivers loaded or the proprietary nvidia
> driver. Nouveau is fine as it doesn't rely on efifb but brings its own.
>

Which is what all DRM drivers should do. If they want to make sure that a
fbdev will be present after the DRM driver probes, then should register an
emulated fbdev.

There was an attempt to workaround that in [0], in particular patch [1]
but that effort was not continued since the only DRM driver that would be
affected is the Nvidia proprietary driver that relies on efifb/simpledrm
to have a VT.

[0]: https://patchwork.kernel.org/project/dri-devel/list/?series=711019&archive=both
[1]: https://patchwork.kernel.org/project/dri-devel/patch/20230111154112.90575-11-daniel.vetter@ffwll.ch/

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat