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

Oleksandr Andrushchenko
2018-06-07T07:33:45Z

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@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.
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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>>> Xen-devel@lists.xenproject.org
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