From: Andi Kleen <ak@linux.intel.com>
To: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: Ingo Molnar <mingo@elte.hu>, Andi Kleen <andi@firstfloor.org>,
x86@kernel.org, linux-kernel@vger.kernel.org,
Borislav Petkov <bp@alien8.de>
Subject: Re: [PATCH 1/3] x86, intel: Output microcode revision
Date: Wed, 25 May 2011 09:58:03 -0700 [thread overview]
Message-ID: <20110525165803.GB14958@tassilo.jf.intel.com> (raw)
In-Reply-To: <20110525160656.GB25225@khazad-dum.debian.net>
> > This can happen if for example the BIOS somehow does not apply the right
> > microcode to all CPUs. It can also happen if physically different microcode
> > version CPUs are mixed. In theory people can mix steppings as well.
>
> In PRACTICE people WILL mix steppings as well.
Yes exactly. I used to have a system with one P3 supporting FXSAVE
and other not :-) I had to fix the kernel back then to support this.
The system worked perfectly fine after the kernel was fixed.
So the check proposed is a bad idea. It would trigger
on real boxes which don't have any obvious problems.
-Andi
next prev parent reply other threads:[~2011-05-25 16:58 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-24 23:03 Andi Kleen
2011-05-24 23:03 ` [PATCH 2/3] x86, intel: Use cpu_update for Atom errata check Andi Kleen
2011-05-25 6:59 ` Ingo Molnar
2011-05-24 23:03 ` [PATCH 3/3] coretemp: Get microcode revision from cpu_data Andi Kleen
2011-05-24 23:58 ` Yu, Fenghua
2011-05-25 0:39 ` [PATCH 1/3] x86, intel: Output microcode revision Fenghua Yu
[not found] ` <BANLkTikoa494-bRWtbbXuE6eqLuH0ZPUTg@mail.gmail.com>
[not found] ` <493994B35A117E4F832F97C4719C4C04011E214EC2@orsmsx505.amr.corp.intel.com>
2011-05-25 0:47 ` Andi Kleen
2011-05-25 6:54 ` Ingo Molnar
2011-05-25 8:00 ` Borislav Petkov
2011-05-25 9:05 ` Ingo Molnar
2011-05-25 10:50 ` Borislav Petkov
2011-05-25 11:28 ` Ingo Molnar
2011-05-25 21:08 ` Borislav Petkov
2011-05-25 11:30 ` Ingo Molnar
2011-05-25 16:54 ` Andi Kleen
2011-05-25 18:59 ` Ingo Molnar
2011-05-25 19:13 ` Andi Kleen
2011-05-25 7:06 ` Ingo Molnar
2011-05-25 16:06 ` Henrique de Moraes Holschuh
2011-05-25 16:58 ` Andi Kleen [this message]
2011-05-25 18:24 ` Ingo Molnar
2011-05-25 19:04 ` Henrique de Moraes Holschuh
2011-05-25 19:36 ` Ingo Molnar
2011-05-25 19:05 ` Andi Kleen
2011-05-25 19:45 ` Ingo Molnar
2011-05-29 10:21 ` Jan Ceuleers
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