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

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Message-ID: <CAE9FiQUXyYCe5i8-hTF2rddTihdgTzh4Wg-MeVEZxjkSD2zsBA@mail.gmail.com>
Date:	Fri, 14 Dec 2012 12:08:50 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
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 Fri, Dec 14, 2012 at 12:04 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> On Fri, Dec 14, 2012 at 11:46 AM, H. Peter Anvin <hpa@...or.com> wrote:
>>
>> I suspect we don't need init_level4_pgt at all and should just plan to
>> get rid of it.  Is there any reason we can't just build the proper
>> kernel page table set in pagetable_init() and switch to it there?
>
> then how to pass the info to AP?

also we should merge early_level4_pgt with init_level4_pgt.

and #PE handler could just extend to use BRK ...

but need to make sure BRK get mapped at first, and BRK could cross the
1G, 512G boundary ...

that could make things less impact to all.
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