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SubjectRE: [RFC PATCH 6/6] drm/i915/gvt: support QEMU getting the dmabuf
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Hi Gerd,

>-----Original Message-----
>From: intel-gvt-dev [mailto:intel-gvt-dev-bounces@lists.freedesktop.org] On
>Behalf Of Gerd Hoffmann
>Sent: Friday, May 19, 2017 4:57 PM
>To: Chen, Xiaoguang <xiaoguang.chen@intel.com>
>Cc: Tian, Kevin <kevin.tian@intel.com>; linux-kernel@vger.kernel.org;
>zhenyuw@linux.intel.com; Alex Williamson <alex.williamson@redhat.com>; Lv,
>Zhiyuan <zhiyuan.lv@intel.com>; intel-gvt-dev@lists.freedesktop.org; Wang, Zhi
>A <zhi.a.wang@intel.com>
>Subject: Re: [RFC PATCH 6/6] drm/i915/gvt: support QEMU getting the dmabuf
>
> Hi,
>
>> >We could also do it the other way around: Instead of having the
>> >kernel returning
>>
>> >the plane description userspace could pass it in, and the kernel
>> >throws -EINVAL in
>>
>> >case it doesn't match due to things having changed meanwhile.
>>
>> Or just return a dmabuf based on the current plane ?
>
>If gvt is able to hand out dma-bufs for inactive planes, then yes, we can do this.
>Have one ioctl where we pass in the plane id, get back a plane description struct,
>and another where we pass in the plane description struct and get back a dma-
>buf fd.
Or more simply just pass the plane id, because even the plane description did not match the current one we will eventually create a dmabuf based on current plane.

>
>cheers,
> Gerd
>
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>intel-gvt-dev@lists.freedesktop.org
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