linux-kernel - Re: [PATCH v2] sparc64: Add support for Application Data Integrity (ADI)

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Date:	Mon, 7 Mar 2016 15:30:23 -0700
From:	Khalid Aziz <khalid.aziz@...cle.com>
To:	David Miller <davem@...emloft.net>
Cc:	corbet@....net, akpm@...ux-foundation.org,
	dingel@...ux.vnet.ibm.com, bob.picco@...cle.com,
	kirill.shutemov@...ux.intel.com, aneesh.kumar@...ux.vnet.ibm.com,
	aarcange@...hat.com, arnd@...db.de, sparclinux@...r.kernel.org,
	rob.gardner@...cle.com, mhocko@...e.cz, chris.hyser@...cle.com,
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	bsegall@...gle.com, geert@...ux-m68k.org, dave@...olabs.net,
	adobriyan@...il.com, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-arch@...r.kernel.org, linux-api@...r.kernel.org
Subject: Re: [PATCH v2] sparc64: Add support for Application Data Integrity
 (ADI)

On 03/07/2016 02:34 PM, David Miller wrote:
> From: Khalid Aziz <khalid.aziz@...cle.com>
> Date: Mon, 7 Mar 2016 14:27:09 -0700
>
>> I agree with your point of view. PSTATE.mcde and TTE.mcd are set in
>> response to request from userspace. If userspace asked for them to be
>> set, they already know but it was the database guys that asked for
>> these two functions and they are the primary customers for the ADI
>> feature. I am not crazy about this idea since this extends the
>> mprotect API even further but would you consider using the return
>> value from mprotect to indicate if PSTATE.mcde or TTE.mcd were already
>> set on the given address?
>
> Well, that's the idea.
>
> If the mprotect using MAP_ADI or whatever succeeds, then ADI is
> enabled.
>
> Users can thus also pass MAP_ADI as a flag to mmap() to get ADI
> protection from the very beginning.
>

MAP_ADI has been sitting in my backlog for some time. Looks like you 
just raised its priority ;)

--
Khalid