linux-kernel - Re: [PATCH 0/3] mmu_notifier: Allow to manage CPU external TLBs

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Message-ID: <20140724144449.GC27715@redhat.com>
Date:	Thu, 24 Jul 2014 16:44:49 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Joerg Roedel <joro@...tes.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Rik van Riel <riel@...hat.com>,
	Hugh Dickins <hughd@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <jweiner@...hat.com>,
	Jerome Glisse <jglisse@...hat.com>, jroedel@...e.de,
	Jay.Cornwall@....com, Oded.Gabbay@....com, John.Bridgman@....com,
	Suravee.Suthikulpanit@....com, ben.sander@....com,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	iommu@...ts.linux-foundation.org
Subject: Re: [PATCH 0/3] mmu_notifier: Allow to manage CPU external TLBs

On Thu, Jul 24, 2014 at 04:35:38PM +0200, Joerg Roedel wrote:
> To solve this situation I wrote a patch-set to introduce a
> new notifier call-back: mmu_notifer_invalidate_range(). This
> notifier lifts the strict requirements that no new
> references are taken in the range between _start() and
> _end(). When the subsystem can't guarantee that any new
> references are taken is has to provide the
> invalidate_range() call-back to clear any new references in
> there.
> 
> It is called between invalidate_range_start() and _end()
> every time the VMM has to wipe out any references to a
> couple of pages. This are usually the places where the CPU
> TLBs are flushed too and where its important that this
> happens before invalidate_range_end() is called.
> 
> Any comments and review appreciated!

Reviewed-by: Andrea Arcangeli <aarcange@...hat.com>
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