Re: [Xen-devel] Is machine_to_phys_mapping a 4MB 'superpage'?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

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


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