linux-kernel - Re: [patch 0/4] x86: AMD microcode patch loading v2 fixes

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Message-ID: <4892FFC1.4060600@amd.com>
Date:	Fri, 1 Aug 2008 14:21:21 +0200
From:	Peter Oruba <peter.oruba@....com>
To:	Dmitry Adamushko <dmitry.adamushko@...il.com>
CC:	Tigran Aivazian <tigran@...azian.fsnet.co.uk>,
	Max Krasnyansky <maxk@...lcomm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch 0/4] x86: AMD microcode patch loading v2 fixes

Dmitry Adamushko schrieb:
> Tigran, Peter,
> 
> 
> may a firmware package contain a few 'microcode' updates for a specific cpu?
> 
> And if so, does each of them provide independent 'errata' fixes? [*]
> 
> (or they are just different versions of the same self-consistent/full
> 'microcode' update and we may need to apply each of them just e.g.
> because we can't jump from stepping X.1 to X.3 without applying X.2 in
> between?
> 
> if it's [1], then I wonder why only a single 'microcode' update (which
> has been previously cached in 'uci->mc') is being applied for the case
> of system-wide resume (apply_microcode_check_cpu()). Don't we need to
> go through the full cpu_request_microcode() cycle to consider all
> updates?
> 
> 
> TIA,
> 

Dmitry,

to answer your question for the AMD part: ucode patches are always 
combo-patches. A ucode patch for a particular CPU revision solves all targeted 
issues at once. There is no case in which two or more ucode patches would be 
applied to a CPU.

Peter

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