[RFC PATCH 0/2] Blob resources + host visible memory

[Gurchetan Singh <gurchetansingh@chromium.org>]

Dear all,

I'm excited to share with you an exciting development in the field
of virtualized graphics: blob resources. Blob resources represent
the evolution of virtio-gpu from the OpenGL resource model to the
VK resource model. Details are in the spec.

Proof of concept kernel[1] and virglrenderer[2] implementations exist,
so it's a good time to formalize the spec, so we can parallelize the
efforts.

Enumerations follow the current virtio-gpu trend and start at 1, where
0 is an invalid value.

Blob resources were developed in collaboration by Gerd Hoffman,
Chia-I-Wu and Gurchetan Singh.

Open questions:
   - TRANSFER_BLOB along with reusing previously hypercalls for
     convenience?
   - Anything else people want?

Possible required changes:
   - Refactoring Pixman dependency in QEMU for blob resources in
     2D hosts?

Possible future work:
   - Emulated coherent `blob_mem` type for QEMU/vhost-user
   - A `blob_mem` type for guest-only resources imported in
     cache-coherent FOSS GPU/display drivers using udmabuf-like
     mechanisms.
   - Display integration involving the blob model.

These spec patches are based on David Steven's UUID patches (hopefully
those will land soon?).

[1] https://gitlab.freedesktop.org/virgl/drm-misc-next/-/commits/resource-blob
[2] https://gitlab.freedesktop.org/virgl/virglrenderer/-/merge_requests/374

Gurchetan Singh (2):
  virtio-gpu: add resource create blob
  virtio-gpu: add support for mapping/unmapping blob resources

 virtio-gpu.tex | 172 +++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 168 insertions(+), 4 deletions(-)

-- 
2.24.1