linux-kernel - Re: [RFC/PATCH v2 02/10] x86

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Message-ID: <54111E99.9010408@zytor.com>
Date:	Wed, 10 Sep 2014 21:01:29 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andrey Ryabinin <a.ryabinin@...sung.com>,
	linux-kernel@...r.kernel.org
CC:	Dmitry Vyukov <dvyukov@...gle.com>,
	Konstantin Serebryany <kcc@...gle.com>,
	Dmitry Chernenkov <dmitryc@...gle.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Yuri Gribov <tetra2005@...il.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Christoph Lameter <cl@...ux.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Hansen <dave.hansen@...el.com>,
	Andi Kleen <andi@...stfloor.org>,
	Vegard Nossum <vegard.nossum@...il.com>, x86@...nel.org,
	linux-mm@...ck.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [RFC/PATCH v2 02/10] x86_64: add KASan support

On 09/10/2014 07:31 AM, Andrey Ryabinin wrote:
> This patch add arch specific code for kernel address sanitizer.
> 
> 16TB of virtual addressed used for shadow memory.
> It's located in range [0xffff800000000000 - 0xffff900000000000]
> Therefore PAGE_OFFSET has to be changed from 0xffff880000000000
> to 0xffff900000000000.

NAK on this.

0xffff880000000000 is the lowest usable address because we have agreed
to leave 0xffff800000000000-0xffff880000000000 for the hypervisor or
other non-OS uses.

Bumping PAGE_OFFSET seems needlessly messy, why not just designate a
zone higher up in memory?

	-hpa

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