linux-kernel - Re: [PATCH 10/26] x86, pkeys: notify userspace about protection key faults

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Date:	Mon, 28 Sep 2015 12:32:26 -0700
From:	Dave Hansen <dave@...1.net>
To:	Christian Borntraeger <borntraeger@...ibm.com>,
	Ingo Molnar <mingo@...nel.org>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 10/26] x86, pkeys: notify userspace about protection key
 faults

On 09/28/2015 12:25 PM, Christian Borntraeger wrote:
> We do not have the storage keys per page table, but for the page frame instead 
> (shared among all mappers) so I am not sure if the whole thing will fit for s390.
> Having a signal for page protection errors might be useful for us - not sure yet.

Ugh, yeah, that's a pretty different architecture.  The stuff we have
here (syscall, VMA flags, etc...) is probably useful to you only for
controlling access to non-shared memory.


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