Attaching SR-IOV ports to existing instances is not supported
since the compute service does not perform any kind of PCI
device allocation, so we should fail fast with a clear error
if attempted. Note that the compute RPC API "attach_interface"
method is an RPC call from nova-api to nova-compute so the error
raised here will result in a 400 response to the user.
Blueprint sriov-interface-attach-detach would need to be
implemented to support this use case, and could arguably involve
a microversion to indicate when the feature was made available.
A related neutron docs patch https://review.openstack.org/594325
is posted for mentioning the limitation with SR-IOV port attach
as well.
Change-Id: Ibbf2bd3cdd45bcd61eebff883c30ded525b2495d
Closes-Bug: #1708433
Matt Riedemann
68011c40ae