Re: [RFC 0/1] Use dmabufs for display updates instead of pixman

[Gerd Hoffmann]

> Hi,

> According to
> https://lore.kernel.org/dri-devel/20210212110140.gdpu7kapnr7ovdcn@sirius.home.kraxel.org/
> proposal, we made some progress on making a 'virtio-gpu (display) +
> pass-through GPU' prototype. We leverage the kmsro framework provided
> by mesa to let the virtio-gpu display work with a passed-through GPU
> in headless mode. And the MR is here:
> https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9592

Cool.

> Although our work is different from this on-going discussion which is
> about enabling a general way to share buffers between guest and host,
> we'd like to leverage this patch. So, is there any plan to refine this
> patch?

Item (1) on Vivek's new TODO list should provide that.  Once we have
shared blob resources we can create udmabufs on the host side, which
in turn allows to drop extra copies in the display path and speed up
this use case as well (both with and without opengl).

take care,
  Gerd