Message-ID: <4892FFC1.4060600@amd.com>
Date: Fri, 1 Aug 2008 14:21:21 +0200
From: Peter Oruba <peter.oruba@amd.com>
Organization: AMD (OSRC)
User-Agent: Thunderbird 2.0.0.16 (X11/20080720)
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To: Dmitry Adamushko <dmitry.adamushko@gmail.com>
CC: Tigran Aivazian <tigran@aivazian.fsnet.co.uk>,
       Max Krasnyansky <maxk@qualcomm.com>, Ingo Molnar <mingo@elte.hu>,
       Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>,
       LKML <linux-kernel@vger.kernel.org>
Subject: Re: [patch 0/4] x86: AMD microcode patch loading v2 fixes
References: <20080729154103.007575982@amd.com>	 <b647ffbd0807290918kaa0a05es3cebf7a6f15fb790@mail.gmail.com>	 <488F581B.7060009@qualcomm.com> <48903431.9060707@amd.com> <b647ffbd0808010425r16db2957i3e7212903a698c19@mail.gmail.com>
In-Reply-To: <b647ffbd0808010425r16db2957i3e7212903a698c19@mail.gmail.com>
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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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