Hello Mauricio,
thanks for providing the nova patch. It worked as expected.
I installed on a node with xsaves enabled and updated nova.conf
# dpkg -l | grep nova
ii nova-api-metadata 2:21.2.4-0ubuntu2.7~ppa3
all OpenStack Compute - metadata API frontend
ii nova-common 2:21.2.4-0ubuntu2.7~ppa3
all OpenStack Compute - common files
ii nova-compute 2:21.2.4-0ubuntu2.7~ppa3
all OpenStack Compute - compute node base
ii nova-compute-kvm 2:21.2.4-0ubuntu2.7~ppa3
all OpenStack Compute - compute node (KVM)
ii nova-compute-libvirt 2:21.2.4-0ubuntu2.7~ppa3
all OpenStack Compute - compute node libvirt support
ii python3-nova 2:21.2.4-0ubuntu2.7~ppa3
all OpenStack Compute Python 3 libraries
# grep cpu_model /etc/nova/nova.conf
cpu_model = EPYC-Rome
cpu_model_extra_flags = -xsaves
Then I restarted nova-compute.
I had the following VM running which was using xsaves:
# virsh dumpxml instance-001499b6 | grep xsaves
<feature policy='require' name='xsaves'/>
I stopped/started the VM and the xsaves feature was disabled after that
# virsh dumpxml instance-001499b6 | grep xsaves
<feature policy='disable' name='xsaves'/>
and that allowed me to migrate the VM to a node with xsaves disabled (newer
kernel)
I think next step should be to start SRU process for this patch,
correct?
Thanks,
Giuseppe
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https://bugs.launchpad.net/bugs/2048517
Title:
EPYC-Rome model without XSAVES may break live migration since the
removal of the flag on the physical CPU
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