Re: [Xen-devel] [PATCH] Paging and memory sharing for HVM guests

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

> A new ioctl seems like the reasonable approach. And as you, say if we're  
> going to have a new ioctl, then let's do it right. When calling  
> xc_map_foreign_batch(), is there any requirement that the pfns you pass 
> in are contiguous (ordering incrementally)? If not, then I think 
> completely over-writing the MFNs is probably the wrong thing to do, as it 
> requires callers to keep two copies of the array to find out which pages 
> didn't map. I would be more in favour of returning a bit vector. As far 

I would suggest you look in xen_exchange_memory in the linux kernel. One
of its customers is xen_create_contiguous_region which replaces MFNs
with ones underneath the 4GB.

There is a requirement in making the PFNs contigous but that is b/c
the Xen side loops over it assuming incremental order.

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