Hi,Note that this one isn't related to this one but to "Add NX protection for kernel data".
I was just shown this[1] on Xen from an Ubuntu bug report[2].
[ 1.230382] NX-protecting the kernel data: 3884k
[ 1.231002] BUG: unable to handle kernel paging request at c1782ae0
...
[ 1.231145] Call Trace:
[ 1.231152] [<c0138481>] ? __change_page_attr+0x2c1/0x370
[ 1.231161] [<c02163a1>] ? __purge_vmap_area_lazy+0xc1/0x180
[ 1.231169] [<c013857c>] ? __change_page_attr_set_clr+0x4c/0xb0
[ 1.231176] [<c0138838>] ? change_page_attr_set_clr+0x128/0x300
[ 1.231183] [<c010798e>] ? __raw_callee_save_xen_restore_fl+0x6/0x8
[ 1.231192] [<c0159ca1>] ? vprintk+0x171/0x3f0
[ 1.231198] [<c0138bdf>] ? set_memory_nx+0x5f/0x70
Does Xen have different size page table allocations or something weird?