linux-kernel - [PATCH 0/2] x86/microcode/amd: Do not overwrite specific patch levels

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Date:	Wed,  1 Jul 2015 22:14:14 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>,
	X86 ML <x86@...nel.org>
Subject: [PATCH 0/2] x86/microcode/amd: Do not overwrite specific patch levels

From: Borislav Petkov <bp@...e.de>

Certain patch levels supplied by the BIOS should not be upgraded and
overwritten by the microcode loader because doing so leaves the system
dead in the water.

The two below provide for filtering out those levels and avoiding the
update, thereby making those patch levels final.

Borislav Petkov (2):
  x86/microcode/amd: Extract current patch level read to a function
  x86/microcode/amd: Do not overwrite final patch levels

 arch/x86/include/asm/microcode_amd.h      |  1 +
 arch/x86/kernel/cpu/microcode/amd.c       | 52 +++++++++++++++++++++++++++++--
 arch/x86/kernel/cpu/microcode/amd_early.c | 24 ++++++++------
 3 files changed, 65 insertions(+), 12 deletions(-)

-- 
2.3.5

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