Currently the IOMMU code allocates one page for the segment table, that
isn't safe if we have more than 132 GB of RAM.
Signed-off-by: NMichael Ellerman <michael@ellerman.id.au>
Acked-by: NJeremy Kerr <jk@ozlabs.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>