Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754500AbYAWOS0 (ORCPT ); Wed, 23 Jan 2008 09:18:26 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752472AbYAWOSR (ORCPT ); Wed, 23 Jan 2008 09:18:17 -0500 Received: from netops-testserver-3-out.sgi.com ([192.48.171.28]:45824 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751824AbYAWOSQ (ORCPT ); Wed, 23 Jan 2008 09:18:16 -0500 Date: Wed, 23 Jan 2008 08:18:14 -0600 From: Robin Holt To: Gerd Hoffmann Cc: Robin Holt , Christoph Lameter , Andrea Arcangeli , Andrew Morton , Nick Piggin , linux-mm@kvack.org, Benjamin Herrenschmidt , steiner@sgi.com, linux-kernel@vger.kernel.org, Avi Kivity , kvm-devel@lists.sourceforge.net, daniel.blueman@quadrics.com, Hugh Dickins Subject: Re: [kvm-devel] [PATCH] export notifier #1 Message-ID: <20080123141814.GE3058@sgi.com> References: <478F9C9C.7070500@qumranet.com> <20080117193252.GC24131@v2.random> <20080121125204.GJ6970@v2.random> <4795F9D2.1050503@qumranet.com> <20080122144332.GE7331@v2.random> <20080122200858.GB15848@v2.random> <4797384B.7080200@redhat.com> <20080123131939.GJ26420@sgi.com> <47974B54.30407@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <47974B54.30407@redhat.com> User-Agent: Mutt/1.5.15+20070412 (2007-04-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1195 Lines: 28 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/