Re: [Xen-devel] Fwd: xc_map_foreign_range()

[Mark Williamson <Mark.Williamson@xxxxxxxxxxxx>]

MFN = Machine Frame Number i.e. the frame number in the *real* machine memory, 
rather than the domain pseudophysical address.

> If this assumption is correct,  how do I get a value for mfn?  Say for
> instance, that I wanted to map the kernel running in the guest domain?
> How about a specific process?

It depends what you're doing...

If you're mapping some sort of device channel that talks to a driver in the 
guest, you'd want the guest to pass you the MFN number (obtained using e.g. 
"virt_to_machine() >> PAGE_SHIFT") using a control message or some other 
out-of-band means.

I think the control tools use some kind of hypercall to find out the list of 
pages owned by a domain for operations (e.g. for suspend / resume / domain 
building).

There may be other things you could try but rather than speculating, I'll 
leave it up to others.  What exactly are you trying to achieve?

Cheers,
Mark


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