Hi, Quite a while ago there were a few patches for adding MTRR support to the Xen kernel, and yes, I know they''ve been NAK from the mainline kernel. I''m wondering if they still exist on some branches of some repo that I could possibly get them from? I found a couple of patch series posted onto the mailing list before but it''s not cleared what version or what tree they should be applied to. In particular, patches from Stephen Tweedie and Jeremy Fitzhardinge: http://lists.xen.org/archives/html/xen-devel/2009-05/msg00228.html and http://lists.xen.org/archives/html/xen-devel/2009-05/msg00538.html Thanks! Regards, Howell.