Re: [Xen-devel] [RFC PATCH] xen/arm: Vmap allocator fails to allocate beyond 128M

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Tue, 2015-02-24 at 10:01 +0000, Jan Beulich wrote:
> >>> On 23.02.15 at 18:03, <ian.campbell@xxxxxxxxxx> wrote:
> > Can we along with this fix perhaps rename to something which does
> > indicate this. MAP_NON_LEAF_PTS or something perhaps? (This is really a
> > question for Jan).
> 
> Renaming wouldn't be the right thing - we'd need a second flag.
> Indeed I've been (ab)using behavior of the x86 implementation
> here that's neither documented nor necessarily obvious.

How about a new arch interface like create_mapping_pts or
populate_pt_range or some such which provides the semantics you want?

On x86 it could just be implemented using map_pages_to_xen(...,
MAP_SMALL_PAGES) and on ARM we'd figure it out somehow.

Ian.


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