Re: [QEMU PATCH v4 10/13] virtio-gpu: Resource UUID

[Albert Esteve <aesteve@xxxxxxxxxx>]

On Wed, Sep 13, 2023 at 12:34 PM Akihiko Odaki <akihiko.odaki@xxxxxxxxxx> wrote:

On 2023/09/13 16:55, Albert Esteve wrote:
> Hi Antonio,
>
> If I'm not mistaken, this patch is related with:
> https://lists.gnu.org/archive/html/qemu-devel/2023-09/msg01853.html
> <https://lists.gnu.org/archive/html/qemu-devel/2023-09/msg01853.html>
> IMHO, ideally, virtio-gpu and vhost-user-gpu both, would use the
> infrastructure from the patch I linked to store the
> virtio objects, so that they can be later shared with other devices.

I don't think such sharing is possible because the resources are
identified by IDs that are local to the device. That also complicates
migration.

Regards,
Akihiko Odaki

Hi Akihiko,

As far as I understand, the feature to export dma-bufs from the

virtgpu was introduced as part of the virtio cross-device sharing

proposal [1]. Thus, it shall be posible. When virtgpu ASSING_UUID,

it exports and identifies the dmabuf resource, so that when the dmabuf gets

shared inside the guest (e.g., with virtio-video), we can use the assigned

UUID to find the dmabuf in the host (using the patch that I linked above),

and import it.

[1] - https://lwn.net/Articles/828988/