linux-kernel - RE: [RFC PATCH 6/6] drm/i915/gvt: support QEMU getting the dmabuf

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Message-ID: <DD379D741F77464281CE7ED1CD7C12DE7065DE73@SHSMSX101.ccr.corp.intel.com>
Date:   Fri, 19 May 2017 09:14:58 +0000
From:   "Chen, Xiaoguang" <xiaoguang.chen@...el.com>
To:     Gerd Hoffmann <kraxel@...hat.com>
CC:     "Tian, Kevin" <kevin.tian@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "zhenyuw@...ux.intel.com" <zhenyuw@...ux.intel.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        "Lv, Zhiyuan" <zhiyuan.lv@...el.com>,
        "intel-gvt-dev@...ts.freedesktop.org" 
        <intel-gvt-dev@...ts.freedesktop.org>,
        "Wang, Zhi A" <zhi.a.wang@...el.com>
Subject: RE: [RFC PATCH 6/6] drm/i915/gvt: support QEMU getting the dmabuf

Hi Gerd,

>-----Original Message-----
>From: intel-gvt-dev [mailto:intel-gvt-dev-bounces@...ts.freedesktop.org] On
>Behalf Of Gerd Hoffmann
>Sent: Friday, May 19, 2017 4:57 PM
>To: Chen, Xiaoguang <xiaoguang.chen@...el.com>
>Cc: Tian, Kevin <kevin.tian@...el.com>; linux-kernel@...r.kernel.org;
>zhenyuw@...ux.intel.com; Alex Williamson <alex.williamson@...hat.com>; Lv,
>Zhiyuan <zhiyuan.lv@...el.com>; intel-gvt-dev@...ts.freedesktop.org; Wang, Zhi
>A <zhi.a.wang@...el.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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