[PATCH] drm/virtio: Create Dumb BOs as guest Blobs (v3)

[Gerd Hoffmann]

On Wed, Apr 14, 2021 at 06:36:55AM +0000, Zhang, Tina wrote:
> Hi Gerd,
> 
> Speaking of the modifier, we notice that the virtio-gpu driver's
> mode_config.allow_fb_modifiers = false, which means virtio-gpu doesn't
> support modifier. With mode_config.allow_fb_modifiers=false, the DRM
> Modifier API would fail. 
> 
> So, do you know if there is any concern about letting virito-gpu allow
> modifiers? Thanks.

Well, virtio-gpu must also provide a list of modifiers then.  We need
some way for virtio-gpu to figure which modifiers are supported by the
host and which are not.  Otherwise we could list LINEAR only which
doesn't buy us much ;)

Not sure whenever virglrenderer allows that already (via
VIRGL_CCMD*QUERY* or via virgl caps).  If not we could define a new
modifiers capability for that, which could then be used for both virgl
and non-virgl mode.

take care,
  Gerd