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

Konrad Rzeszutek Wilk wrote:
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.

If we know that the PFNs have to be contiguous (and we're happy having this be a requirement), then completely overwriting the MFNs is probably easier than returning a bit vector (and wouldn't require extra support in libxc).


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