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Date:   Wed, 6 Jun 2018 15:05:21 -0700
From:   Dongwon Kim <dongwon.kim@intel.com>
To:     Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc:     Oleksandr Andrushchenko <andr2000@gmail.com>,
        matthew.d.roper@intel.com, jgross@suse.com,
        Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>,
        linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
        daniel.vetter@intel.com, xen-devel@lists.xenproject.org,
        linux-media@vger.kernel.org
Subject: Re: [Xen-devel] [PATCH v2 9/9] xen/gntdev: Expose gntdev's dma-buf
 API for in-kernel use
Message-ID: <20180606220521.GA7054@downor-Z87X-UD5H>
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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@epam.com>
> >>>
> >>> 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.

> 
> 
> >>
> >> -boris
> >>
> > [1] https://patchwork.freedesktop.org/series/38207/
> > [2] https://patchwork.freedesktop.org/patch/204447/
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@lists.xenproject.org
> > https://lists.xenproject.org/mailman/listinfo/xen-devel
>