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

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Message-ID: <56DE0F9F.90801@oracle.com>
Date:	Mon, 7 Mar 2016 15:32:47 -0800
From:	Rob Gardner <rob.gardner@...cle.com>
To:	Khalid Aziz <khalid.aziz@...cle.com>,
	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,
	mhocko@...e.cz, chris.hyser@...cle.com, richard@....at,
	vbabka@...e.cz, koct9i@...il.com, oleg@...hat.com,
	gthelen@...gle.com, jack@...e.cz, xiexiuqi@...wei.com,
	Vineet.Gupta1@...opsys.com, luto@...nel.org, ebiederm@...ssion.com,
	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 10:24 AM, Khalid Aziz wrote:
>
> Tags can be cleared by user by setting tag to 0. Tags are 
> automatically cleared by the hardware when the mapping for a virtual 
> address is removed from TSB (which is why swappable pages are a 
> problem), so kernel does not have to do it as part of clean up.
>

I don't understand this. The hardware isn't involved  when a mapping for 
a virtual address is removed from the TSB, so how could it automatically 
clear tags?

Rob