linux-kernel - Re: [Intel-gfx] [PATCH v9 5/7] vfio: Define vfio based dma-buf operations

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Date:   Thu, 29 Jun 2017 08:41:53 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     "Zhang, Tina" <tina.zhang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>
Cc:     "Wang, Zhenyu Z" <zhenyu.z.wang@...el.com>,
        "intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Chen, Xiaoguang" <xiaoguang.chen@...el.com>,
        Kirti Wankhede <kwankhede@...dia.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: [Intel-gfx] [PATCH v9 5/7] vfio: Define vfio based dma-buf
 operations

  Hi,

> > Does gvt track the live cycle of all dma-bufs it has handed out?
> 
> The V9 implementation does track the dma-bufs' live cycle. The
> original idea was that leaving the dma-bufs' live cycle management to
> user mode.

That is still the case, user space decides which dma-bufs it'll go keep
cached.  But kernel space can see what user space is doing, so there is
no need to explicitly tell the kernel whenever a cached dma-buf exists
or not.

cheers,
  Gerd