Comment 5 for bug 1857245

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Dincer Celik (dincercelik) wrote : Re: New host live migration

Live Migration failure: operation failed: guest CPU doesn't match specification: missing features: vmx: libvirtError: operation failed: guest CPU doesn't match specification: missing features: vmx

I think you are using mixed type of cpus on your compute nodes so you cannot do live migration between them with passthrough cpu mode. You may try overriding cpu types, see https://docs.openstack.org/nova/stein/configuration/config.html#libvirt.cpu_mode