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-'only emulated cpus are available performance will be significantly limited' is caused by fact that virtualization such as VT-x is not enabled in BIOS (or you are running your Compute Host in VM, but that's less likely). So you are not using KVM, while nova.conf contains 'kvm' as virt_type most probably. So options are - to enable VT-x or, that's worse, change to QEMU as virt_type

That is likely causing ''no valid host host found' .

But note that this error has a number of reasons. To check what are those - check logs for nova-scheduler on controller, nova compute on Compute Hosts and possibly Neutron logs. Turn on debug in Nova in case not clear.