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

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Message-ID: <CAE9FiQXOrH4POQESnGycSrf-7e5MhO9y1wfa7ZSEVr9TO_45ZA@mail.gmail.com>
Date:	Tue, 11 Dec 2012 09:15:30 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Borislav Petkov <bp@...en8.de>, Yinghai Lu <yinghai@...nel.org>,
	"H. Peter Anvin" <hpa@...or.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>,
	"hpa@...ux.intel.com" <hpa@...ux.intel.com>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>
Subject: Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early update
 ucode on Intel's CPU

On Tue, Dec 11, 2012 at 9:06 AM, Borislav Petkov <bp@...en8.de> wrote:
> On Tue, Dec 11, 2012 at 09:00:55AM -0800, Yinghai Lu wrote:
>> ok, then next question is how early it should be.
>>
>> before early_cpu_init/early_identify_cpu
>>
>> or just before check_bugs/identify_cpu
>
> Read the code. It's in x86_64_start_kernel on 64-bit.
>

No, that is not right place. initrd could be loaded anywhere like way
high by bootloader.

to make code simple, we should have following sequence in setup_arch

early_ioremap_init()
early_update_microcode()...
early_cpu_init()

early_update_microcode could use early_ioremap to access initrd ramdisk area.

Yinghai
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