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

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Message-Id: <20160307.163401.1082539079648850099.davem@davemloft.net>
Date:	Mon, 07 Mar 2016 16:34:01 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	khalid.aziz@...cle.com
Cc:	corbet@....net, akpm@...ux-foundation.org,
	dingel@...ux.vnet.ibm.com, bob.picco@...cle.com,
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	linux-arch@...r.kernel.org, linux-api@...r.kernel.org
Subject: Re: [PATCH v2] sparc64: Add support for Application Data Integrity
 (ADI)

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.