vfio: Check that IOMMU MR translates to system address space
At the moment IOMMU MR only translate to the system memory. However if some new code changes this, we will need clear indication why it is not working so here is the check. Signed-off-by: NAlexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au> Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>
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