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Message-ID: <1498718513.31562.3.camel@redhat.com>
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
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