From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Date: Mon, 21 Sep 2009 20:34:06 +0000 (-0700)
Subject: xen: check EFER for NX before setting up GDT mapping
X-Git-Tag: v2.6.32-rc1~17^2~7^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b75fe4e5b869f8dbebd36df64a7fcda0c5b318ed;p=pandora-kernel.git

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>
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