linux-kernel - Re: [PATCH] mmu notifiers #v8

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Message-ID: <20080305003722.GG1510@wotan.suse.de>
Date:	Wed, 5 Mar 2008 01:37:22 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Christoph Lameter <clameter@....com>
Cc:	Andrea Arcangeli <andrea@...ranet.com>,
	Jack Steiner <steiner@....com>, akpm@...ux-foundation.org,
	Robin Holt <holt@....com>, Avi Kivity <avi@...ranet.com>,
	Izik Eidus <izike@...ranet.com>,
	kvm-devel@...ts.sourceforge.net,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	general@...ts.openfabrics.org,
	Steve Wise <swise@...ngridcomputing.com>,
	Roland Dreier <rdreier@...co.com>,
	Kanoj Sarcar <kanojsarcar@...oo.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	daniel.blueman@...drics.com
Subject: Re: [PATCH] mmu notifiers #v8

On Mon, Mar 03, 2008 at 11:01:22AM -0800, Christoph Lameter wrote:
> On Mon, 3 Mar 2008, Nick Piggin wrote:
> 
> > I'm still not completely happy with this. I had a very quick look
> > at the GRU driver, but I don't see why it can't be implemented
> > more like the regular TLB model, and have TLB insertions depend on
> > the linux pte, and do invalidates _after_ restricting permissions
> > to the pte.
> > 
> > Ie. I'd still like to get rid of invalidate_range_begin, and get
> > rid of invalidate calls from places where permissions are relaxed.
> 
> Isnt this more a job for paravirt ops if it is so tightly bound to page 
> tables? Are we not adding another similar API?

Um, it's bound to the *Linux page tables*, yes. And I have no idea why
you would use the paravirt ops for this.

 
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