linux-kernel - Re: [Intel-gfx] [Announcement] 2015-Q3 release of XenGT - a Mediated Graphics Passthrough Solution from Intel

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Date:	Tue, 24 Nov 2015 11:49:39 +0000
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Alex Williamson <alex.williamson@...hat.com>,
	"Tian, Kevin" <kevin.tian@...el.com>,
	"igvt-g@...1.01.org" <igvt-g@...1.01.org>,
	"Reddy, Raghuveer" <raghuveer.reddy@...el.com>,
	"White, Michael L" <michael.l.white@...el.com>,
	"Cowperthwaite, David J" <david.j.cowperthwaite@...el.com>,
	"intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
	"Li, Susie" <susie.li@...el.com>,
	"Dong, Eddie" <eddie.dong@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	qemu-devel <qemu-devel@...gnu.org>,
	"Zhou, Chao" <chao.zhou@...el.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	"Zhu, Libo" <libo.zhu@...el.com>,
	"Wang, Hongbo" <hongbo.wang@...el.com>
Subject: Re: [Intel-gfx] [Announcement] 2015-Q3 release of XenGT - a Mediated
 Graphics Passthrough Solution from Intel

On Tue, Nov 24, 2015 at 12:19:18PM +0100, Daniel Vetter wrote:
> Downside: Tracking mapping changes on the guest side won't be any easier.
> This is mostly a problem for integrated gpus, since discrete ones usually
> require contiguous vram for scanout. I think saying "don't do that" is a
> valid option though, i.e. we're assuming that page mappings for a in-use
> scanout range never changes on the guest side. That is true for at least
> all the current linux drivers.

Apart from we already suffer limitations of fixed mappings and have patches
that want to change the page mapping of active scanouts.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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