Re: [virtio-dev] Re: [PATCH 1/2] virtio: add dma-buf support for exported objects

[David Stevens <stevensd@chromium.org>]

On Tue, Feb 25, 2020 at 3:10 PM Gerd Hoffmann <kraxel@redhat.com> wrote:
>
> On Wed, Feb 19, 2020 at 05:06:36PM +0900, David Stevens wrote:
> > This change adds a new flavor of dma-bufs that can be used by virtio
> > drivers to share exported objects. A virtio dma-buf can be queried by
> > virtio drivers to obtain the UUID which identifies the underlying
> > exported object.
>
> That duplicates a bunch of code from dma-buf.c in virtio_dma_buf.c.
>
> How about dma_buf_{get,set}_uuid, simliar to dma_buf_set_name?

While I'm not opposed to such an API, I'm also hesitant to make
changes to the dma-buf API for a single use case.

As for the duplicated code around virtio_dma_buf_export_info, it can
be removed by sacrificing a little bit of type safety, if that's
preferable.

-David