Instead of having the same error checks in vtd_realize()
and amdvi_realize(), move that over to the generic
x86_iommu_realize().
Reviewed-by: NPeter Xu <peterx@redhat.com>
Reviewed-by: NEduardo Habkost <ehabkost@redhat.com>
Signed-off-by: NMohammed Gamal <mgamal@redhat.com>
Reviewed-by: NThomas Huth <thuth@redhat.com>