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

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 3 Jul 2006, at 12:50, Simon Kagstrom wrote:

> Causes an assertion to trigger when booting the Linux dom0:
>
> (XEN) Assertion '(x & PGT_count_mask) != 0' failed, line 1430, file 
> mm.c
> Is this due to how Xen works or is it because Linux uses writable page
> tables (I have not checked the Linux sources other than the
> __xen_guest_section).
This occurs because the pagetable protection no longer works. When 
Linux writes directly to a pagetable it succeeds rather than trapping 
into Xen where appropriate reference counting and validation would 
occur.
 -- Keir


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