From: Andi Kleen <andi@firstfloor.org>
To: Borislav Petkov <bp@alien8.de>, "H. Peter Anvin" <hpa@zytor.com>,
Andi Kleen <andi@firstfloor.org>,
x86@kernel.org, eranian@google.com, linux-kernel@vger.kernel.org,
a.p.zijlstra@chello.nl, Andi Kleen <ak@linux.intel.com>
Subject: Re: [PATCH 1/2] x86: Track minimum microcode revision globally
Date: Tue, 12 Jun 2012 23:03:29 +0200 [thread overview]
Message-ID: <20120612210329.GD11413@one.firstfloor.org> (raw)
In-Reply-To: <20120612205956.GB26817@liondog.tnic>
On Tue, Jun 12, 2012 at 10:59:56PM +0200, Borislav Petkov wrote:
> On Tue, Jun 12, 2012 at 01:52:14PM -0700, H. Peter Anvin wrote:
> > Different CPUs in a multisocket system may have different compatible
> > ucode versions.
>
> Ah, so you need the different ucode for the different steppings of the
> cpus on the board, right? Assuming ucode versions are incremented per
> F:M:S tuple, of course, then you can have different compatible microcode
> versions.
I believe just for different models. Different models in a single system
may be possible, but are quite unsupported. The code doesn't
handle that, but I don't really worry about that.
> > Of course, I am not even sure if it makes any sense at all to compare
> > microcode versions without qualifying them with F:M:S.
It doesn't.
But I think this model handles 99.999% of all sane configs, don't
really want to complicate it more.
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
prev parent reply other threads:[~2012-06-12 21:03 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-12 20:33 [PATCH 1/2] x86: Track minimum microcode revision globally Andi Kleen
2012-06-12 20:33 ` [PATCH 2/2] perf/x86: check ucode before disabling PEBS on SandyBridge Andi Kleen
2012-06-12 20:36 ` [PATCH 1/2] x86: Track minimum microcode revision globally H. Peter Anvin
2012-06-12 20:39 ` Andi Kleen
2012-06-12 20:49 ` Borislav Petkov
2012-06-12 20:52 ` H. Peter Anvin
2012-06-12 20:59 ` Borislav Petkov
2012-06-12 21:03 ` Andi Kleen [this message]
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