linux-kernel - Re: [kvm-devel] [PATCH] export notifier #1

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Message-ID: <20080123141814.GE3058@sgi.com>
Date:	Wed, 23 Jan 2008 08:18:14 -0600
From:	Robin Holt <holt@....com>
To:	Gerd Hoffmann <kraxel@...hat.com>
Cc:	Robin Holt <holt@....com>, Christoph Lameter <clameter@....com>,
	Andrea Arcangeli <andrea@...ranet.com>,
	Andrew Morton <akpm@...l.org>, Nick Piggin <npiggin@...e.de>,
	linux-mm@...ck.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	steiner@....com, linux-kernel@...r.kernel.org,
	Avi Kivity <avi@...ranet.com>, kvm-devel@...ts.sourceforge.net,
	daniel.blueman@...drics.com, Hugh Dickins <hugh@...itas.com>
Subject: Re: [kvm-devel] [PATCH] export notifier #1

On Wed, Jan 23, 2008 at 03:12:36PM +0100, Gerd Hoffmann wrote:
>   Hi,
> 
> >> That would render the notifies useless for Xen too.  Xen needs to
> >> intercept the actual pte clear and instead of just zapping it use the
> >> hypercall to do the unmap and release the grant.
> > 
> > We are tackling that by having our own page table hanging off the
> > structure representing our seg (thing created when we do the equiv of
> > your grant call).
> 
> --verbose please.  I don't understand that "own page table" trick.  Is
> that page table actually used by the processor or is it just used to
> maintain some sort of page list?

We have a seg structure which is similar to some structure you probably
have which describes the grant.  One of the things hanging off that
seg structure is essentially a page table containing PFNs with their
respective flags (XPMEM specific and not the same as the pfn flags in
the processor page tables).

Thanks,
Robin
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