Re: [Xen-devel] ACPI-Tables corrupted?

To:	Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	Re: [Xen-devel] ACPI-Tables corrupted?
From:	Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date:	Wed, 28 Jul 2010 11:03:36 +0100
Cc:
Delivery-date:	Wed, 28 Jul 2010 03:04:30 -0700
Envelope-to:	www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to:	<4C4FFA97.1000902@xxxxxxxxxxxxxx>
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:	AcsuOMD6UXO5LvuSRcqncqPhBGqi7QAA2PIJ
Thread-topic:	[Xen-devel] ACPI-Tables corrupted?
User-agent:	Microsoft-Entourage/12.24.0.100205

On 28/07/2010 10:38, "Juergen Gross" <juergen.gross@xxxxxxxxxxxxxx> wrote:

> As you can see, the DMAR eye-catcher is replaced by blanks!
> This leads to a programmed panic in the crash kernel later in case of a
> panic in dom0...
> 
> Any ideas?
> BTW: seen in unstable AND 4.0

Look at the tail of xen/drivers/passthrough/vtd/dmar.c: Xen *always*
*unconditionally* trashes the DMAR so that dom0 will not parse it.
Presumably bad stuff would happen if it did.

See for example xen-unstable:20181 changeset comment for something of an
explanation and the patch originator.

 -- Keir

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

WARNING - OLD ARCHIVES

xen-devel

Re: [Xen-devel] ACPI-Tables corrupted?