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

["Nakajima, Jun" <jun.nakajima@xxxxxxxxx>]

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)
...

Jun
---
Intel Open Source Technology Center 

-----Original Message-----
From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Keir Fraser
Sent: Thursday, June 15, 2006 1:09 AM
To: Simon Kagstrom
Cc: xen-devel list
Subject: Re: [Xen-devel] WP flag in CR0, setting


On 15 Jun 2006, at 09:00, Simon Kagstrom wrote:

>> We can't support this. We rely on write protection for all sorts of
>> things (e.g., prevent guest write access to page tables). You'll have
>> to temporarily make the mapping writable, or make a kernel-private
>> writable mapping.
>
> Thanks for the explanation. Would the WP flag work in a HVM setting?

It may not be supported right now, but it would be easy to do so if not.

  -- Keir


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