WARNING - OLD ARCHIVES

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/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

Re: [Xen-devel] Xen hypervisor hangs on booting against c/s 16925

To: Jan Beulich <jbeulich@xxxxxxxxxx>
Subject: Re: [Xen-devel] Xen hypervisor hangs on booting against c/s 16925
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Tue, 29 Jan 2008 10:45:23 +0000
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date: Tue, 29 Jan 2008 02:47:29 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
In-reply-to: <479F0F62.76E4.0078.0@xxxxxxxxxx>
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/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: AchiZAy8Sw66r85XEdyyYwAX8io7RQ==
Thread-topic: [Xen-devel] Xen hypervisor hangs on booting against c/s 16925
User-agent: Microsoft-Entourage/11.3.6.070618
On 29/1/08 10:34, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

> Otoh, with
> PAGE_HYPERVISOR_NOCACHE encoding UC- rather than UC, mapping
> WP MTRR regions this way would yield (model specific) WC, which again
> seems suspicious, so maybe the VGA hole should simply be kept (from
> boot, at UC-), but everything else should be forced to UC (or MTRRs
> should be inquired so that at least WP regions can be kept WP).

If we don't write to a MTRR WP region, then actually mapping as WC does not
matter. We never write to the range 0xc0000-0xfffff. Anything we write to
below 0xa0000 had better be RAM, or we've got bigger problems than the WP
attribute!

 -- Keir



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