 Home |
Products |
Support |
Community |
News |
xen-devel
Re: [Xen-devel] Is machine_to_phys_mapping a 4MB 'superpage'?
| To: | Jacob Gorm Hansen <jacobg@xxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Is machine_to_phys_mapping a 4MB 'superpage'? |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Thu, 31 Mar 2005 08:52:29 +0100 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Thu, 31 Mar 2005 07:49:20 +0000 |
| Envelope-to: | www-data@xxxxxxxxxxxxxxxxxxx |
| In-reply-to: | <424B6D94.1080900@xxxxxxx> |
| List-help: | <mailto:xen-devel-request@lists.xensource.com?subject=help> |
| List-id: | Xen developer discussion <xen-devel.lists.xensource.com> |
| List-post: | <mailto:xen-devel@lists.xensource.com> |
| List-subscribe: | <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe> |
| List-unsubscribe: | <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe> |
| References: | <424B6D94.1080900@xxxxxxx> |
| Sender: | xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
On 31 Mar 2005, at 04:25, Jacob Gorm Hansen wrote: The machine_to_phys_mapping table is mapped permanently at 0xFC000000 (on x86-32). I would like to experiment with letting the domU map it at other locations in its virtual address space, but I suppose that for performance it is mapped as a 4MB 'super' page, and as such needs special treatment, is this correct? It doesn't *have* to be mapped as a superpage -- control tools don't when doing suspend/resume, for example. Fixing the permission checking so that other than domain0 can remap the m2p table shouldn't be very hard, but I'm not sure what the cleanest method would be. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
| <Prev in Thread] | Current Thread | [Next in Thread> |
|---|---|---|
| ||
| Previous by Date: | Re: RE: RE: [Xen-devel] poor domU VBD performance., Jens Axboe |
|---|---|
| Next by Date: | Re: [Xen-devel] poor domU VBD performance., Keir Fraser |
| Previous by Thread: | [Xen-devel] Is machine_to_phys_mapping a 4MB 'superpage'?, Jacob Gorm Hansen |
| Next by Thread: | Re: [Xen-devel] Is machine_to_phys_mapping a 4MB 'superpage'?, Jacob Gorm Hansen |
| Indexes: | [Date] [Thread] [Top] [All Lists] |
