Xen and xkbcomp: (EE) XKB: Could not invoke xkbcomp

Ever since I got my MK802, I stopped using X on my Xen server.  I recently tried to start X for someone and discovered that it wouldn't start.  I got some weird error about xkbcomp being unable to be executed.  I tried looking for Gentoo-specific pages but nothing turned up.  I stumbled upon a Debian bug page and noticed that it was flagged as a kernel defect related to hypervisors.  I decided to google for Xen-specific information and found these blog posts.  It turns out the kernel has a bug related to Page Attribute Table.  When I added 'nopat' to my grub.conf and rebooted, X started up.