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

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Date:   Fri, 19 May 2017 10:57:02 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     "Chen, Xiaoguang" <xiaoguang.chen@...el.com>
Cc:     Alex Williamson <alex.williamson@...hat.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "zhenyuw@...ux.intel.com" <zhenyuw@...ux.intel.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,

> >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.

cheers,
  Gerd