Just posting a "me too" ;-)

Running into the same issue:

2018-04-05 17:39:46.933 237964 DEBUG nova.network.os_vif_util [req-36b544f4-91a6-442e-a30d-6148220d1449 d7530d1d970f48b2b19cf1f2a5289a4a 5516f95420f14e1885fde8449654a412 - - -] No conversion for VIF type hw_veb yet nova_to_osvif_vif /usr/lib/python2.7/site-packages/nova/network/os_vif_util.py:416

2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server [req-36b544f4-91a6-442e-a30d-6148220d1449 d7530d1d970f48b2b19cf1f2a5289a4a 5516f95420f14e1885fde8449654a412 - - -] Exception during message handling
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/server.py", line 133, in _process_incoming
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server     res = self.dispatcher.dispatch(message)
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 150, in dispatch
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server     return self._do_dispatch(endpoint, method, ctxt, args)
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 121, in _do_dispatch
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server     result = func(ctxt, **new_args)
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/exception_wrapper.py", line 75, in wrapped
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server     function_name, call_dict, binary)
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server     self.force_reraise()
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/exception_wrapper.py", line 66, in wrapped
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server     return f(self, context, *args, **kw)
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 216, in decorated_function
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server     kwargs['instance'], e, sys.exc_info())
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server     self.force_reraise()
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 204, in decorated_function
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 5047, in attach_interface
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server     self.driver.attach_interface(instance, image_meta, network_info[0])
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 1372, in attach_interface
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server     self._host)
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/vif.py", line 539, in get_config
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server     inst_type, virt_type, host)
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/vif.py", line 320, in get_config_hw_veb
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server     conf, net_type, profile['pci_slot'],
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server KeyError: 'pci_slot'
2018-04-05 17:39:46.950 237964 ERROR oslo_messaging.rpc.server 


So according to
https://blueprints.launchpad.net/nova/+spec/sriov-interface-attach-detach
it seems that attaching / detaching SR-IOV ports is not possible.

Can we convert this bug report to make the ERROR message more verbose?