linux-kernel - Re: [PATCH v5 1/2] x86_64: remove not needed clear_page for init_level4

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Date:	Wed, 17 Jun 2015 14:43:13 +0300
From:	Alexander Popov <alpopov@...ecurity.com>
To:	Borislav Petkov <bp@...en8.de>,
	Andrey Ryabinin <a.ryabinin@...sung.com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>,
	Alexander Kuleshov <kuleshovmail@...il.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Kees Cook <keescook@...omium.org>, <x86@...nel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 1/2] x86_64: remove not needed clear_page for init_level4_page

On 16.06.2015 18:46, Borislav Petkov wrote:
> On Tue, Jun 16, 2015 at 02:45:06PM +0300, Andrey Ryabinin wrote:
>> Can't we just move clear_page(init_level4_pgt) higher? Before or right
>> after clear_bss() (iow before kasan_early_init()).
> 
> That sounds much better. And I don't see anything depending on
> init_level4_pgt before we clear it. And it boots here if I move it
> before
> 
> 	kasan_map_early_shadow(early_level4_pgt);

Thanks, Borislav and Andrey.
I'll return with version 6.

Best regards,
Alexander

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