linux-kernel - Re: [PATCH] x86, microcode, AMD: Add support for family 16h processors

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Message-ID: <20121117153127.GA30471@x1.osrc.amd.com>
Date:	Sat, 17 Nov 2012 16:31:27 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Gene Heskett <gheskett@...v.com>,
	Boris Ostrovsky <boris.ostrovsky@....com>, hpa@...or.com,
	mingo@...e.hu, tglx@...utronix.de,
	herrmann.der.user@...glemail.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86, microcode, AMD: Add support for family 16h
 processors

On Sat, Nov 17, 2012 at 01:29:19PM -0200, Henrique de Moraes Holschuh wrote:
> On Sat, 17 Nov 2012, Borislav Petkov wrote:
> > On Thu, Nov 15, 2012 at 06:35:17PM -0500, Boris Ostrovsky wrote:
> > > One possibility is that BIOS already incorporated all patches (which
> > > typically is the case) and so the driver doesn't have to do anything.
> > 
> > /proc/cpuinfo contains ucode version and the processor's f/m/s, which
> > is enough information to tell us whether your old phenom needs ucode
> > patching.
> 
> Maybe, however F/M/S information is incomplete, not to mention trying to
> rebuild the proper processor signature from it is anything but
> forward-proof.  For Intel, it is also useless, you also need the processor
> flags...
> 
> If /proc/cpuinfo is to be useful for microcode purposes, it should add a
> microcode signature line, with CPUID(1).EAX, and on Intel processors, also a
> second parameter with the processor flags mask (I don't know if AMD needs
> something else other than CPUID(1).EAX).

I was speaking only about that particular case of Gene's AMD CPU.

-- 
Regards/Gruss,
Boris.
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