RE: [Xen-devel] Changeset 15035 causes x86-32 to hang

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Keir Fraser
> Sent: 05 June 2007 10:31
> To: Stefan Berger
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] Changeset 15035 causes x86-32 to hang
> 
> On 4/6/07 17:58, "Stefan Berger" <stefanb@xxxxxxxxxx> wrote:
> 
> 
> 
>       The rdmsr is causing the crash on my machines. 
>       This patch fixes the problem: 
>       
> 
> 
> Thanks for tracking it down. I fixed the patch to handle the 
> (possibly non-existent) case of a machine that supports Long 
> Mode but not NX, and checked in as 15222:0feaf2fc75d3.

Some early 64-bit Intel processors have this combo of LM but no NX -
apparently, we kept NX sufficiently hidden that Intel didn't manage to
get it fully working for the first public release of the processor. So
whilst those processors are most likely quite rare, they do exist. All
AMD processors that reached the public have NX capability if they have
long-mode. 

--
Mats
> 
>  -- Keir
> 
> 



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