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

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 14 Jun 2006, at 13:52, Simon Kagstrom wrote:

> I have a slight problem in my guest port with the WP bit in CR0. The
> original kernel maps certain kernel pages to user-mode read-only and
> relies on the kernel being able to modify these despite the read-only
> bit being set in the pages. This in turn requires that the WP bit is
> unset in CR0.
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.
 -- Keir


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