vfio: Remove unneeded union from VFIOContainer
Currently the VFIOContainer iommu_data field contains a union with different information for different host iommu types. However: * It only actually contains information for the x86-like "Type1" iommu * Because we have a common listener the Type1 fields are actually used on all IOMMU types, including the SPAPR TCE type as well In fact we now have a general structure for the listener which is unlikely to ever need per-iommu-type information, so this patch removes the union. In a similar way we can unify the setup of the vfio memory listener in vfio_connect_container() that is currently split across a switch on iommu type, but is effectively the same in both cases. The iommu_data.release pointer was only needed as a cleanup function which would handle potentially different data in the union. With the union gone, it too can be removed. Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au> Reviewed-by: NLaurent Vivier <lvivier@redhat.com> Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>
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