Re: [QEMU PATCH v5 00/13] Support blob memory and venus on qemu

[Dmitry Osipenko]

On 9/15/23 14:11, Huang Rui wrote:
> Hi all,
> 
> Antonio Caggiano made the venus with QEMU on KVM platform last
> September[1]. This series are inherited from his original work to support
> the features of context init, hostmem, resource uuid, and blob resources
> for venus.
> At March of this year, we sent out the V1 version[2] for the review. But
> those series are included both xen and virtio gpu. Right now, we would like
> to divide into two parts, one is to continue the Antonio's work to upstream
> virtio-gpu support for blob memory and venus, and another is to upstream
> xen specific patches. This series is focusing on virtio-gpu, so we are
> marking as V4 version here to continue Antonio's patches[1]. And we will
> send xen specific patches separately, because they are hypervisor specific.
> Besides of QEMU, these supports also included virglrenderer[3][4] and
> mesa[5][6] as well. Right now, virglrenderer and mesa parts are all
> accepted by upstream. In this qemu version, we try to address the concerns
> around not proper cleanup during blob resource unmap and unref. Appreciate
> it if you have any commments.

Venus uses blob buffers. In order to display Venus/VK application using
GL display server, the VIRTIO_GPU_CMD_SET_SCANOUT_BLOB must be
supported. Otherwise Venus itself isn't practically useful because you
can't run VK application with a usual Linux DE because Venus will error
out due to the unsupported command.

The VIRTIO_GPU_CMD_SET_SCANOUT_BLOB support needs to be a part of this
series, IMO. Can we add it to the next patchset version?

-- 
Best regards,
Dmitry