From: Gerd Hoffmann <kraxel@redhat.com>
To: Keir Fraser <Keir.Fraser@cl.cam.ac.uk>
Cc: Derek Murray <Derek.Murray@cl.cam.ac.uk>,
"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
Eduardo Habkost <ehabkost@redhat.com>,
Juan Quintela <quintela@redhat.com>,
"Stephen C. Tweedie" <sct@redhat.com>,
Jan Beulich <jbeulich@novell.com>,
Glauber de Oliveira Costa <gcosta@redhat.com>,
Chris Wright <chrisw@sous-sol.org>,
"virtualization@lists.osdl.org" <virtualization@lists.osdl.org>
Subject: Re: Re: Next steps with pv_ops for Xen
Date: Wed, 05 Dec 2007 21:06:08 +0100 [thread overview]
Message-ID: <475704B0.1000701@redhat.com> (raw)
In-Reply-To: <C37C979D.19732%Keir.Fraser@cl.cam.ac.uk>
>> Alternatively, could we use the _PAGE_GNTTAB PTE flag that is used for
>> debugging? Indeed, if we did this, could be obviate the need for the
>> PTE-zapping hook, by instead catching the case where this flag is set,
>> and unmapping the grant implicitly?
>
> Well, in the general case you don't have enough info to know which grant to
> release (a single page can be granted multiple times).
You'll also get the mm and the addr which should make it sufficiently
unique, so this looks like a doable approach to me.
ptep_get_and_clear_full() in include/asm-x86/pgtable_32.h needs to be
changed take care, but that should be possible to do and the change is
local to x86 paravirt_ops, which looks much better to me than touching
generic mm code.
cheers,
Gerd
next prev parent reply other threads:[~2007-12-05 20:06 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-21 22:05 Next steps with pv_ops for Xen Stephen C. Tweedie
2007-11-21 23:12 ` Jeremy Fitzhardinge
2007-11-26 14:02 ` Juan Quintela
2007-11-26 18:52 ` Jeremy Fitzhardinge
2007-11-27 8:30 ` Jan Beulich
2007-11-27 17:00 ` Jeremy Fitzhardinge
2007-11-27 17:14 ` Jan Beulich
2007-11-27 17:15 ` Stephen C. Tweedie
2007-12-03 12:54 ` Gerd Hoffmann
2007-12-03 13:19 ` Derek Murray
2007-12-03 14:16 ` Gerd Hoffmann
2007-12-03 14:51 ` Derek Murray
2007-12-03 17:18 ` Mark Williamson
2007-12-03 18:36 ` D.G. Murray
2007-12-03 19:08 ` Mark Williamson
2007-12-04 9:35 ` tgh
2007-12-05 3:42 ` Mark Williamson
2007-12-06 15:21 ` Gerd Hoffmann
2007-12-06 15:32 ` Derek Murray
2007-12-06 15:55 ` Gerd Hoffmann
2007-12-21 12:58 ` [Xen-devel] " Gerd Hoffmann
2007-12-21 12:58 ` Gerd Hoffmann
2007-12-03 20:38 ` Gerd Hoffmann
2007-12-04 9:40 ` Derek Murray
2007-12-04 12:01 ` Gerd Hoffmann
2007-12-04 12:39 ` Stephen C. Tweedie
2007-12-04 19:58 ` Gerd Hoffmann
2007-12-05 11:48 ` [Xen-devel] " Derek Murray
2007-12-05 11:48 ` Derek Murray
2007-12-05 14:12 ` Gerd Hoffmann
2007-12-05 14:22 ` Keir Fraser
2007-12-05 14:30 ` Derek Murray
2007-12-05 16:58 ` Keir Fraser
2007-12-05 17:17 ` Derek Murray
2007-12-05 17:22 ` Keir Fraser
2007-12-05 17:48 ` Derek Murray
2007-12-05 17:59 ` Keir Fraser
2007-12-05 18:15 ` Derek Murray
2007-12-12 8:27 ` Isaku Yamahata
2007-12-12 8:39 ` Keir Fraser
2007-12-12 8:44 ` Isaku Yamahata
2007-12-05 20:06 ` Gerd Hoffmann [this message]
2007-12-05 18:12 ` Jeremy Fitzhardinge
2007-12-05 18:29 ` Derek Murray
2007-12-05 20:15 ` Jeremy Fitzhardinge
2007-12-05 20:35 ` Geoffrey Lefebvre
2007-12-06 10:15 ` Gerd Hoffmann
2007-12-05 20:44 ` Keir Fraser
2007-12-06 10:00 ` Derek Murray
2007-12-06 19:55 ` [Xen-devel] " Jeremy Fitzhardinge
2007-12-05 13:19 ` Derek Murray
2007-12-04 21:08 ` Ian Main
2007-12-05 10:03 ` Gerd Hoffmann
2007-12-05 12:51 ` Gerd Hoffmann
2007-12-05 10:11 ` Derek Murray
2007-12-04 20:59 ` Ian Main
2007-12-05 11:54 ` Derek Murray
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