This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


Re: [Xen-devel] feature suggestion: DMAR table emulation for Xen

To: Joanna Rutkowska <joanna@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] feature suggestion: DMAR table emulation for Xen
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Fri, 14 May 2010 12:29:53 +0100
Cc: "Han, Weidong" <weidong.han@xxxxxxxxx>, "Cihula, Joseph" <joseph.cihula@xxxxxxxxx>, "Kay, Allen M" <allen.m.kay@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Delivery-date: Fri, 14 May 2010 04:31:00 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <4BED2CD5.4060900@xxxxxxxxxxxxxxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: AcrzVAbwLnVnUvtATJ64y4iWllm38QABL6UD
Thread-topic: [Xen-devel] feature suggestion: DMAR table emulation for Xen
User-agent: Microsoft-Entourage/
On 14/05/2010 11:58, "Joanna Rutkowska" <joanna@xxxxxxxxxxxxxxxxxxxxxx>

> Well, we don't do graphics passthrough in Qubes, mostly for two reasons:
> 1) We believe users prefer seamless integration of all apps onto one
> desktop (and that requires only one domain, e.g. Dom0, to have access to
> the graphics card),
> 2) Giving a potentially untrusted domain full access to the graphics
> device creates a potential security risk. In fact, you cannot make such
> an architecture secure without using TXT (yes, TXT in addition to VT-d).
> Do you do IGD passthrough in Xen Client?

Yes, particularly necessary to get decent 3D performance (e.g., Windows
Aero). There are tricks to get security and performance (doing a mix of
emulation and passthrough).

 -- Keir

Xen-devel mailing list

<Prev in Thread] Current Thread [Next in Thread>