From: Andre Przywara <andre.przywara@amd.com>
Date: Fri, 1 Jun 2012 14:52:37 +0000 (+0200)
Subject: x86, cpu, amd: Fix crash as Xen Dom0 on AMD Trinity systems
X-Git-Tag: v3.6-rc1~167^2~19^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=169e9cbd77db23fe50bc8ba68bf081adb67b4220;p=pandora-kernel.git

x86, cpu, amd: Fix crash as Xen Dom0 on AMD Trinity systems

f7f286a910221 ("x86/amd: Re-enable CPU topology extensions in case BIOS
has disabled it") wrongfully added code which used the AMD-specific
{rd,wr}msr variants for no real reason.

This caused boot panics on xen which wasn't initializing the
{rd,wr}msr_safe_regs pv_ops members properly.

This, in turn, caused a heated discussion leading to us reviewing all
uses of the AMD-specific variants and removing them where unneeded
(almost everywhere except an obscure K8 BIOS fix, see 6b0f43ddfa358).

Finally, this patch switches to the standard {rd,wr}msr*_safe* variants
which should've been used in the first place anyway and avoided unneeded
excitation with xen.

Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Link: http://lkml.kernel.org/r/1338562358-28182-4-git-send-email-bp@amd64.org
Cc: Andreas Herrmann <andreas.herrmann3@amd.com>
Link: <http://lkml.kernel.org/r/1338383402-3838-1-git-send-email-andre.przywara@amd.com>
[Boris: correct and expand commit message]
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
---

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