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

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Message-Id: <9E98939B-E2C6-4530-A822-ED550FC3B9D2@zytor.com>
Date:	Wed, 10 Sep 2014 21:26:46 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Dave Hansen <dave.hansen@...el.com>
Cc:	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Andrey Ryabinin <a.ryabinin@...sung.com>,
	LKML <linux-kernel@...r.kernel.org>,
	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>,
	Andi Kleen <andi@...stfloor.org>,
	Vegard Nossum <vegard.nossum@...il.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-mm@...ck.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

Except you just broke PVop kernels.

Sent from my tablet, pardon any formatting problems.

> On Sep 10, 2014, at 15:45, Dave Hansen <dave.hansen@...el.com> wrote:
> 
>> On 09/10/2014 01:30 PM, Andrey Ryabinin wrote:
>> Yes, there is a reason for this. For inline instrumentation we need to
>> catch access to userspace without any additional check.
>> This means that we need shadow of 1 << 61 bytes and we don't have so
>> many addresses available.
> 
> That sounds reasonable.
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