Re: [Xen-devel] [PATCH v2 9/9] xen/gntdev: Expose gntdev's dma-buf API for in-kernel use

[Oleksandr Andrushchenko]

On 06/07/2018 01:05 AM, Dongwon Kim wrote:
> On Wed, Jun 06, 2018 at 05:51:38PM -0400, Boris Ostrovsky wrote:
> > On 06/06/2018 08:46 AM, Oleksandr Andrushchenko wrote:
> > > On 06/05/2018 01:36 AM, Boris Ostrovsky wrote:
> > > > On 06/01/2018 07:41 AM, Oleksandr Andrushchenko wrote:
> > > > > From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
> > > > >
> > > > > Allow creating grant device context for use by kernel modules which
> > > > > require functionality, provided by gntdev. Export symbols for dma-buf
> > > > > API provided by the module.
> > > > Can you give an example of who'd be using these interfaces?
> > > There is no use-case at the moment I can think of, but hyper dma-buf
> > > [1], [2]
> > > I let Intel folks (CCed) to defend this patch as it was done primarily
> > > for them
> > > and I don't use it in any of my use-cases. So, from this POV it can be
> > > dropped,
> > > at least from this series.
> >
> > Yes, let's drop this until someone actually needs it.
> >
> > -boris
> I agree. We are working on re-architecturing hyper_dmabuf. We would use zcopy
> apis however, not sure if we are going to do it from kernel or from userspace.
> So please do not expose those for now.
Ok, as we are all on the same page for that then I'll drop this patch 
for now
> > > > -boris
> > > [1] https://patchwork.freedesktop.org/series/38207/
> > > [2] https://patchwork.freedesktop.org/patch/204447/
> > >
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