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  1. Bug #1570400
  2. Comment #1

Comment 1 for bug 1570400

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Elena Ezhova (eezhova) wrote : Re: SR-IOV port cannot be added to a VM if it is already has one

It is currently impossible to attach direct or macvtap type ports to an instance as it requires additional pci device allocation which nova doesn't support. There is a similar bug in nova [1] and a spec [2] which is still on review, so the feature would land in Newton in the best-case scenario.

[1] https://bugs.launchpad.net/nova/+bug/1499269
[2] https://review.openstack.org/#/c/139910