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---
features:
- |
In this release SR-IOV live migration support is added to the libvirt
virt driver for Neutron interfaces. Neutron SR-IOV interfaces can be
grouped into two categories, direct mode interfaces and indirect.
Direct mode SR-IOV interfaces are directly attached to the guest and
exposed to the guest OS. Indirect mode SR-IOV interfaces have a software
interface such as a macvtap between the guest and the SR-IOV device.
This feature enables transparent live migration for instances with
indirect mode SR-IOV devices. As there is no generic way to copy
hardware state during a live migration, direct mode migration is not
transparent to the guest. For direct mode interfaces, we mimic the
workflow already in place for suspend and resume. For instance with
SR-IOV devices, we detach the direct mode interfaces before migration
and re-attach them after the migration. As a result, instances
with direct mode SR-IOV port will lose network connectivity during a
migration unless a bond with a live migratable interface is created
within the guest.
upgrade:
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The Libvirt SR-IOV migration feature intoduced in this release requires
both the source and destination node to support the feature. As a result
it will be automatically disabled until the conductor and compute nodes
have been upgraded.
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