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From: Derek Murray <Derek.Murray@cl.cam.ac.uk>
To: Keir Fraser <Keir.Fraser@cl.cam.ac.uk>
Cc: "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>,
	Gerd Hoffmann <kraxel@redhat.com>
Subject: Re: Re: Next steps with pv_ops for Xen
Date: Wed, 05 Dec 2007 17:48:49 +0000	[thread overview]
Message-ID: <4756E481.1060201@cl.cam.ac.uk> (raw)
In-Reply-To: <C37C8EDC.1971B%Keir.Fraser@cl.cam.ac.uk>

Keir Fraser wrote:
> Need to bite the bullet and fix this properly by setting a software flag in
> ptes that are not subject to reference counting.

Could we get away with testing the VM_FOREIGN flag in vm_normal_page()? 
Although I get the impression that this wouldn't be easily justified if 
trying to merge with upstream Linux....

> Unfortunately that also needs a hypervisor interface change, to allow
> setting of those pte flags. Easily done though, and we should definitely get
> that piece in for 3.2.0.

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?

Otherwise, what would the semantics of this new flag be?

Regards,

Derek.

  reply	other threads:[~2007-12-05 17:48 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             ` Gerd Hoffmann
2007-12-21 12:58             ` [Xen-devel] " 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 [this message]
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
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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