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Subject: Re: [RFC/PATCH v2 02/10] x86_64: add KASan support
From: "H. Peter Anvin" <hpa@zytor.com>
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Date: Wed, 10 Sep 2014 21:26:46 -0700
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>,
        Andrey Ryabinin <a.ryabinin@samsung.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Dmitry Vyukov <dvyukov@google.com>,
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        Dmitry Chernenkov <dmitryc@google.com>,
        Andrey Konovalov <adech.fo@gmail.com>,
        Yuri Gribov <tetra2005@gmail.com>,
        Konstantin Khlebnikov <koct9i@gmail.com>,
        Sasha Levin <sasha.levin@oracle.com>, Christoph Lameter <cl@linux.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
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To: Dave Hansen <dave.hansen@intel.com>
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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@intel.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.