| commit | b75fe4e5b869f8dbebd36df64a7fcda0c5b318ed | |
| author | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | |
| Mon, 21 Sep 2009 20:34:06 +0000 (21 13:34 -0700) | ||
| committer | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | |
| Mon, 21 Sep 2009 20:49:43 +0000 (21 13:49 -0700) | ||
| tree | cba533110e8514184ddc63ab2ea37c38dc8a1861 | treesnapshot (tar.gz zip) |
| parent | 79b520e87e1214cfa107bdc8528b5d6c055a8b82 | commitdiff |
xen: check EFER for NX before setting up GDT mapping
x86-64 assumes NX is available by default, so we need to
explicitly check for it before using NX. Some first-generation
Intel x86-64 processors didn't support NX, and even recent systems
allow it to be disabled in BIOS.
[ Impact: prevent Xen crash on NX-less 64-bit machines ]
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stable Kernel <stable@kernel.org>
x86-64 assumes NX is available by default, so we need to
explicitly check for it before using NX. Some first-generation
Intel x86-64 processors didn't support NX, and even recent systems
allow it to be disabled in BIOS.
[ Impact: prevent Xen crash on NX-less 64-bit machines ]
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stable Kernel <stable@kernel.org>
| arch/x86/mm/Makefile | diffblobblamehistory | |
| arch/x86/xen/enlighten.c | diffblobblamehistory |