WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

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
__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


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

<Prev in Thread] Current Thread [Next in Thread>