Commit by "Huang2, Wei" <Wei.Huang2@amd.com> on default :: 14778:fb0463b6094d /xen/arch/x86/mm/hap/hap.c: (link)
http://xenbits.xensource.com/xen-unstable.hg/rev/fb0463b6094d [HAP] Install P2M entries in monitor table under PAE mode This patch installs P2M table entries in monitor table when Xen is running under PAE mode. Without it, hypervisor might have trouble of accessing guests' high memory.