Merge tag 'vfio-v6.18-rc6' of https://github.com/awilliam/linux-vfio

Pull VFIO seftest fixes from Alex Williamson:

 - Fix vfio selftests to remove the expectation that the IOMMU supports
   a 64-bit IOVA space.

   These manifest both in the original set of tests introduced this
   development cycle in identity mapping the IOVA to buffer virtual
   address space, as well as the more recent boundary testing.

   Implement facilities for collecting the valid IOVA ranges from the
   backend, implement a simple IOVA allocator, and use the information
   for determining extents (Alex Mastro)

* tag 'vfio-v6.18-rc6' of https://github.com/awilliam/linux-vfio:
  vfio: selftests: replace iova=vaddr with allocated iovas
  vfio: selftests: add iova allocator
  vfio: selftests: fix map limit tests to use last available iova
  vfio: selftests: add iova range query helpers