puppet-nova/releasenotes/notes/cpu_mode-for-virt_type=qemu...

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---
upgrade:
- The default value for nova::compute::libvirt::libvirt_cpu_mode
when nova::compute::libvirt::libvirt_virt_type is set to 'qemu'
has been changed from 'host-model' to 'none'. The Nova gate
does not really test the 'host-model' option in their CI, but
'none' due to Devstack configuration, and it is known to create
issues with QEMU 2.6 (see
https://bugzilla.redhat.com/show_bug.cgi?id=1404627).