xen: check EFER for NX before setting up GDT mapping

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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>

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This commit is contained in:

Jeremy Fitzhardinge 2009-09-21 13:34:06 -07:00

parent 79b520e87e

commit b75fe4e5b8

2 changed files with 6 additions and 5 deletions

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1

arch/x86/mm/Makefile

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10

arch/x86/xen/enlighten.c

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