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Date: Fri, 21 Dec 2012 16:14:18 +0100
From: Borislav Petkov <bp@alien8.de>
To: "Yu, Fenghua" <fenghua.yu@intel.com>
Cc: Michael Tokarev <mjt@tls.msk.ru>, H Peter Anvin <hpa@zytor.com>,
        Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
        "Mallick, Asit K" <asit.k.mallick@intel.com>,
        Tigran Aivazian <tigran@aivazian.fsnet.co.uk>,
        Yinghai Lu <yinghai@kernel.org>,
        Andreas Herrmann <andreas.herrmann3@amd.com>,
        Borislav Petkov <borislav.petkov@amd.com>,
        linux-kernel <linux-kernel@vger.kernel.org>, x86 <x86@kernel.org>
Subject: Re: [PATCH v4 00/11] x86/microcode: Early load microcode
Message-ID: <20121221151418.GC15226@liondog.tnic>
Mail-Followup-To: Borislav Petkov <bp@alien8.de>,
	"Yu, Fenghua" <fenghua.yu@intel.com>,
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	Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
	"Mallick, Asit K" <asit.k.mallick@intel.com>,
	Tigran Aivazian <tigran@aivazian.fsnet.co.uk>,
	Yinghai Lu <yinghai@kernel.org>,
	Andreas Herrmann <andreas.herrmann3@amd.com>,
	Borislav Petkov <borislav.petkov@amd.com>,
	linux-kernel <linux-kernel@vger.kernel.org>, x86 <x86@kernel.org>
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On Fri, Dec 21, 2012 at 03:09:48PM +0000, Yu, Fenghua wrote:
> > Why loading microcode this early is important? Why it is bad to load
> > it at the end of (initial) boot?
> >
> If not loading microcode early, we may hit some issues (e.g. PSE on
> Atom) and disable some CPU features. These issues can not be fixed by
> loading ucode during run time.

This question keeps popping up with this patchset, maybe you could
enlarge the first paragraph of Documentation/x86/early-microcode.txt
with a bit more detail and examples.

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
--