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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 |
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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 |
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