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

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Message-ID: <20160326233157.GA11398@khazad-dum.debian.net>
Date:	Sat, 26 Mar 2016 20:31:57 -0300
From:	Henrique de Moraes Holschuh <hmh@....eng.br>
To:	Borislav Petkov <bp@...en8.de>
Cc:	LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>
Subject: Re: [PATCH 0/2] x86/microcode/amd: Do not overwrite specific patch
 levels

On Wed, 01 Jul 2015, Borislav Petkov wrote:
> 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

This patchset looks like it is pretty much a requirement for any distro that
ships AMD microcode updates...  Maybe the two commits should be sent to
-stable, now that they have seen lots of testing in mainline 4.4.x as well
as SuSE kernels?

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh