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Re: [Xen-devel] WP flag in CR0, setting

from [Keir Fraser] [Permanent Link][Original]
To: "Nakajima, Jun" <jun.nakajima@xxxxxxxxx>
Subject: Re: [Xen-devel] WP flag in CR0, setting
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Sat, 17 Jun 2006 08:21:32 +0100
Cc: Simon Kagstrom <simon.kagstrom@xxxxxx>, xen-devel list <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On 17 Jun 2006, at 01:50, Nakajima, Jun wrote:


It should be working in HVM guest. See, for example:

...
Memory: 3040444k/3071992k available (1918k kernel code, 30156k reserved, 
775k data, 176k init, 2154492k highmem)
Checking if this processor honours the WP bit even in supervisor mode... 
Ok.
Calibrating delay using timer specific routine.. 4803.94 BogoMIPS
(lpj=9607882)
That shows it honours CR0.WP=1, which is all Linux cares about. Linux never sets CR0.WP=0 so that case is probably not tested. 

 -- Keir


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