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

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Message-ID: <50CB9172.8060801@zytor.com>
Date:	Fri, 14 Dec 2012 12:52:02 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Borislav Petkov <bp@...en8.de>,
	"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>,
	"hpa@...ux.intel.com" <hpa@...ux.intel.com>,
	"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 12/14/2012 12:17 PM, Yinghai Lu wrote:
> On Fri, Dec 14, 2012 at 12:10 PM, H. Peter Anvin <hpa@...or.com> wrote:
>> What info are you referring to?
> 
> pointer to init_level4_pgt page.
> 

We point the trampoline at the proper page tables in swapper_pg_dir;
this means pushing realmode initialization (but not reservation!) after
pagetable_init(), but that should be fine I *believe*... the big
question is if we have something that wants to invoke EFI before then,
if so it could get tricky.

	-hpa

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