linux-kernel - Re: [PATCH v8 07/10] x86, mpx: decode MPX instruction to get bound violation information

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Date:	Thu, 11 Sep 2014 15:32:42 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Qiaowei Ren <qiaowei.ren@...el.com>
CC:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	x86@...nel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 07/10] x86, mpx: decode MPX instruction to get bound
 violation information

On 09/11/2014 03:18 PM, Thomas Gleixner wrote:
> On Thu, 11 Sep 2014, Qiaowei Ren wrote:
>> This patch sets bound violation fields of siginfo struct in #BR
>> exception handler by decoding the user instruction and constructing
>> the faulting pointer.
>>
>> This patch does't use the generic decoder, and implements a limited
>> special-purpose decoder to decode MPX instructions, simply because the
>> generic decoder is very heavyweight not just in terms of performance
>> but in terms of interface -- because it has to.
> 
> And why is that an argument to add another special purpose decoder?

Peter asked for it to be done this way specifically:

	https://lkml.org/lkml/2014/6/19/411

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