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Hi, I''m trying to get PaX (http://pax.grsecurity.net) working on a 64-bit paravirt_ops guest under xen. One of the features that PaX uses under a 64-bit kernel is the NX bit. I''m using the paxtest utility (available at http://paxgrsecurity.net) to test whether the NX bit is working. On a host with NX support, a 64-bit 2.6.18 xen kernel has a working NX bit. Under a vanilla 2.6.27.4 paravirt_ops kernel with HIGHMEM64 and PAE enabled however, the nx bit doesn''t seem to work. The nx flag is listed in /proc/cpuinfo on both t...