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

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

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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