linux-kernel - Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early update ucode on Intel's CPU

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Message-ID: <20121219230329.GM24895@liondog.tnic>
Date:	Thu, 20 Dec 2012 00:03:29 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Jacob Shin <jacob.shin@....com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Yinghai Lu <yinghai@...nel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	"Yu, Fenghua" <fenghua.yu@...el.com>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>
Subject: Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early update
 ucode on Intel's CPU

On Wed, Dec 19, 2012 at 04:59:41PM -0600, Jacob Shin wrote:
> I can check but right, they might be used up. But even if we had slots
> available, the memory range that needs to be covered is in large
> enough address and aligned in such a way that you cannot cover it with
> variable range MTRRs.

Actually, if I'm not mistaken, you only need to cover the HT hole with
one MTRR - the rest remains WB. And in order the mask bits to work, we
could make it a little bigger - we waste some memory but that's nothing
in comparison to the MCE.

You might need to talk to hw guys about the feasibility of this deal
though.

Thanks.

-- 
Regards/Gruss,
    Boris.

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