[PATCH v2 0/2] xen/grant-table: Avoid m2p_override during mapping

[Zoltan Kiss]

The grant mapping API does m2p_override unnecessarily: only gntdev needs it,
for blkback and future netback patches it just cause a lock contention, as
those pages never go to userspace. Therefore this series does the following:
- move the m2p_override part from grant_[un]map_refs to gntdev, where it is
  needed after mapping operations
- but move set_phys_to_machine from m2p_override to gnttab_[un]map_refs,
  because it is needed always
- update the function prototypes as kmap_ops are no longer needed

v2:
- move the storing of the old mfn in page->index to gnttab_map_refs
- move the function header update to a separate patch

Signed-off-by: Zoltan Kiss <zoltan.kiss@xxxxxxxxxx>
Suggested-by: David Vrabel <david.vrabel@xxxxxxxxxx>

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