nova/releasenotes/notes/libvirt-cpu-model-extra-fla...

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---
security:
- |
The 'SSBD' and 'VIRT-SSBD' cpu flags have been added to the list
of available choices for the ``[libvirt]/cpu_model_extra_flags``
config option. These are important for proper mitigation of the
Spectre 3a and 4 CVEs. Note that the use of either of these flags
require updated packages below nova, including libvirt, qemu
(specifically >=2.9.0 for virt-ssbd), linux, and system
firmware. For more information see
https://www.us-cert.gov/ncas/alerts/TA18-141A