From: Borislav Petkov <petkovbb@googlemail.com>
Date: Mon, 31 Aug 2009 07:50:09 +0000 (+0200)
Subject: x86, msr: Add rd/wrmsr interfaces with preset registers
X-Git-Tag: v2.6.32-rc1~711^2~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=132ec92f3f70fe365c1f4b8d46e66cf8a2a16880;p=pandora-kernel.git

x86, msr: Add rd/wrmsr interfaces with preset registers

native_{rdmsr,wrmsr}_safe_regs are two new interfaces which allow
presetting of a subset of eight x86 GPRs before executing the rd/wrmsr
instructions. This is needed at least on AMD K8 for accessing an erratum
workaround MSR.

Originally based on an idea by H. Peter Anvin.

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
LKML-Reference: <1251705011-18636-1-git-send-email-petkovbb@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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