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(parent: b0c4d95) | patch
x86, amd: Check X86_FEATURE_OSVW bit before accessing OSVW MSRs
authorAndreas Herrmann <herrmann.der.user@googlemail.com>
Tue, 27 Apr 2010 10:13:48 +0000 (12:13 +0200)
committerH. Peter Anvin <hpa@linux.intel.com>
Thu, 13 May 2010 23:21:20 +0000 (16:21 -0700)
commitf01487119dda3d9f58c9729c7361ecc50a61c188
treebbd1d01429950207716337fbbd9e9f356560258ctree | snapshot
parentb0c4d952a158a6a2547672cf4fc9d55e415410decommit | diff
x86, amd: Check X86_FEATURE_OSVW bit before accessing OSVW MSRs

If host CPU is exposed to a guest the OSVW MSRs are not guaranteed
to be present and a GP fault occurs. Thus checking the feature flag is
essential.

Cc: <stable@kernel.org> # .32.x .33.x
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
LKML-Reference: <20100427101348.GC4489@alberich.amd.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
arch/x86/kernel/process.c diff | blob | history
Domain: System / Kernel;