From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1752739AbbKXLuM (ORCPT <rfc822;w@1wt.eu>);
	Tue, 24 Nov 2015 06:50:12 -0500
Received: from mail.fireflyinternet.com ([87.106.93.118]:56206 "EHLO
	fireflyinternet.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org
	with ESMTP id S1752515AbbKXLuK (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Tue, 24 Nov 2015 06:50:10 -0500
X-Default-Received-SPF: pass (skip=forwardok (res=PASS)) x-ip-name=78.156.65.138;
Date: Tue, 24 Nov 2015 11:49:39 +0000
From: Chris Wilson <chris@chris-wilson.co.uk>
To: Alex Williamson <alex.williamson@redhat.com>,
        "Tian, Kevin" <kevin.tian@intel.com>,
        "igvt-g@ml01.01.org" <igvt-g@ml01.01.org>,
        "Reddy, Raghuveer" <raghuveer.reddy@intel.com>,
        "White, Michael L" <michael.l.white@intel.com>,
        "Cowperthwaite, David J" <david.j.cowperthwaite@intel.com>,
        "intel-gfx@lists.freedesktop.org" <intel-gfx@lists.freedesktop.org>,
        "Li, Susie" <susie.li@intel.com>, "Dong, Eddie" <eddie.dong@intel.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>,
        qemu-devel <qemu-devel@nongnu.org>, "Zhou, Chao" <chao.zhou@intel.com>,
        Paolo Bonzini <pbonzini@redhat.com>, "Zhu, Libo" <libo.zhu@intel.com>,
        "Wang, Hongbo" <hongbo.wang@intel.com>
Subject: Re: [Intel-gfx] [Announcement] 2015-Q3 release of XenGT - a Mediated
 Graphics Passthrough Solution from Intel
Message-ID: <20151124114939.GI22980@nuc-i3427.alporthouse.com>
Mail-Followup-To: Chris Wilson <chris@chris-wilson.co.uk>,
	Alex Williamson <alex.williamson@redhat.com>,
	"Tian, Kevin" <kevin.tian@intel.com>,
	"igvt-g@ml01.01.org" <igvt-g@ml01.01.org>,
	"Reddy, Raghuveer" <raghuveer.reddy@intel.com>,
	"White, Michael L" <michael.l.white@intel.com>,
	"Cowperthwaite, David J" <david.j.cowperthwaite@intel.com>,
	"intel-gfx@lists.freedesktop.org" <intel-gfx@lists.freedesktop.org>,
	"Li, Susie" <susie.li@intel.com>,
	"Dong, Eddie" <eddie.dong@intel.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>,
	qemu-devel <qemu-devel@nongnu.org>,
	"Zhou, Chao" <chao.zhou@intel.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	"Zhu, Libo" <libo.zhu@intel.com>,
	"Wang, Hongbo" <hongbo.wang@intel.com>
References: <53D215D3.50608@intel.com>
 <547FCAAD.2060406@intel.com>
 <54AF967B.3060503@intel.com>
 <5527CEC4.9080700@intel.com>
 <559B3E38.1080707@intel.com>
 <562F4311.9@intel.com>
 <1447870341.4697.92.camel@redhat.com>
 <AADFC41AFE54684AB9EE6CBC0274A5D15F7152DB@SHSMSX101.ccr.corp.intel.com>
 <1447963356.4697.184.camel@redhat.com>
 <20151124111917.GO17050@phenom.ffwll.local>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20151124111917.GO17050@phenom.ffwll.local>
User-Agent: Mutt/1.5.21 (2010-09-15)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

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