vdpa: Adapt vhost_vdpa_get_vring_base to SVQ
This is needed to achieve migration, so the destination can restore its index. Setting base as last used idx, so destination will see as available all the entries that the device did not use, including the in-flight processing ones. This is ok for networking, but other kinds of devices might have problems with these retransmissions. Signed-off-by: NEugenio Pérez <eperezma@redhat.com> Acked-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NJason Wang <jasowang@redhat.com>
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