linux-kernel - Re: [PATCH 2/5] mmu_notifier: keep track of active invalidation ranges

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Date:	Thu, 06 Nov 2014 16:03:20 -0500
From:	Rik van Riel <riel@...hat.com>
To:	j.glisse@...il.com, akpm@...ux-foundation.org
CC:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	joro@...tes.org, Mel Gorman <mgorman@...e.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <jweiner@...hat.com>,
	Larry Woodman <lwoodman@...hat.com>,
	Dave Airlie <airlied@...hat.com>,
	Brendan Conoboy <blc@...hat.com>,
	Joe Donohue <jdonohue@...hat.com>,
	Duncan Poole <dpoole@...dia.com>,
	Sherry Cheung <SCheung@...dia.com>,
	Subhash Gutti <sgutti@...dia.com>,
	John Hubbard <jhubbard@...dia.com>,
	Mark Hairgrove <mhairgrove@...dia.com>,
	Lucien Dunning <ldunning@...dia.com>,
	Cameron Buschardt <cabuschardt@...dia.com>,
	Arvind Gopalakrishnan <arvindg@...dia.com>,
	Shachar Raindel <raindel@...lanox.com>,
	Liran Liss <liranl@...lanox.com>,
	Roland Dreier <roland@...estorage.com>,
	Ben Sander <ben.sander@....com>,
	Greg Stoner <Greg.Stoner@....com>,
	John Bridgman <John.Bridgman@....com>,
	Michael Mantor <Michael.Mantor@....com>,
	Paul Blinzer <Paul.Blinzer@....com>,
	Laurent Morichetti <Laurent.Morichetti@....com>,
	Alexander Deucher <Alexander.Deucher@....com>,
	Oded Gabbay <Oded.Gabbay@....com>,
	Jérôme Glisse <jglisse@...hat.com>
Subject: Re: [PATCH 2/5] mmu_notifier: keep track of active invalidation ranges

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On 11/03/2014 03:42 PM, j.glisse@...il.com wrote:
> From: Jérôme Glisse <jglisse@...hat.com>
> 
> The mmu_notifier_invalidate_range_start() and 
> mmu_notifier_invalidate_range_end() can be considered as forming
> an "atomic" section for the cpu page table update point of view. 
> Between this two function the cpu page table content is unreliable
>  for the address range being invalidated.
> 
> Current user such as kvm need to know when they can trust the 
> content of the cpu page table. This becomes even more important to 
> new users of the mmu_notifier api (such as HMM or ODP).
> 
> This patch use a structure define at all call site to 
> invalidate_range_start() that is added to a list for the duration 
> of the invalidation. It adds two new helpers to allow querying if
> a range is being invalidated or to wait for a range to become
> valid.
> 
> For proper synchronization, user must block new range invalidation 
> from inside there invalidate_range_start() callback, before
> calling the helper functions. Otherwise there is no garanty that a
> new range invalidation will not be added after the call to the
> helper function to query for existing range.
> 
> Signed-off-by: Jérôme Glisse <jglisse@...hat.com>

Reviewed-by: Rik van Riel <riel@...hat.com>

- -- 
All rights reversed
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