linux-kernel - Re: [PATCH 1/3] x86, ucode-amd: Load ucode-patches once and not separately fo each CPU

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Message-ID: <4AFA6CEB.6020202@ladisch.de>
Date:	Wed, 11 Nov 2009 08:51:07 +0100
From:	Clemens Ladisch <clemens@...isch.de>
To:	Dmitry Adamushko <dmitry.adamushko@...il.com>
CC:	Andreas Herrmann <herrmann.der.user@...glemail.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] x86, ucode-amd: Load ucode-patches once and not separately
 fo each CPU

Dmitry Adamushko wrote:
> btw., if we could safely assume that all the cpus after the ucode
> upgrade share the same version/patch-level of ucode, we would be able
> to cache a single ucode instance once and use it for all. I don't
> recall anyone clearly stating that such multi-cpu-type systems can't
> really exist.
> 
> e.g. is it possible to have AMD systems with cpus which differ from
> each other not only by their revisions (patch_level)?

The Revision Guide for AMD Family 10h Processors (#41322) says, in
section "Mixed Silicon Support", that the Opteron B steppings can be
used with each other (DR-BA, DR-B2, DR-B3; CPUID 00100F2xh).  Are
different steppings considered equivalent?


Clemens
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