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

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Message-ID: <479750CA.4070101@redhat.com>
Date:	Wed, 23 Jan 2008 15:35:54 +0100
From:	Gerd Hoffmann <kraxel@...hat.com>
To:	Robin Holt <holt@....com>
CC:	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

Robin Holt wrote:
> 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).

i.e. page tables used by hardware != cpu, right?

In the Xen guest case the normal processor page tables are modified, but
in a special way to make the Xen hypervisor also release the grant.

cheers,
  Gerd
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