Use of VM_IOREMAP in xenbus

[Christoph Hellwig]

Hi Wei,

commit ccc9d90a9a8b5 ("xenbus_client: Extend interface to support
multi-page ring") addes a use of vmap in what is now
xenbus_map_ring_valloc_hvm, and uses the VM_IOREMAP flag that is
only really intended for implementing ioremap.  Do you remember
what the reason is that this flag was used?