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Re: [Xen-devel] [hybrid] : mmap pfn space...

On Mon, 16 Apr 2012, Ian Campbell wrote:
> > In a nutshell, I am still trying to figure how to allocate rsvd pfn's 
> > for privcmd without writing a slab allocator.
> Can't you just use the core get_page function (or
> alloc_xenballooned_pages) and move the associated mfn aside temporarily
> (or not if using alloc_xenballooned_pages)?

I think that is a good suggestion: if we are trying to get in something
that works but might not be the best solution, then using
alloc_xenballooned_pages to get some pages and then changing the p2m is
the best option: it wastes a non-trivial amount of memory in dom0 but at
least it is known to work well and it wouldn't be an "hack".

Give a look at gntdev_alloc_map, gnttab_map_refs and m2p_add_override
for an example.

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