Comment 10 for bug 1618473

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Alexei Sheplyakov (asheplyakov) wrote : Re: It is not possible to boot Ubuntu 16.04 xenial on hardware host with Ubuntu 14.04

By the way, the "host-model" mode is documented to be dangerous [1]:

"Beware, due to the way libvirt detects host CPU and due to the fact libvirt does not talk to QEMU/KVM when creating the CPU model, CPU configuration created using host-model may not work as expected. The guest CPU may differ from the configuration and it may also confuse guest OS by using a combination of CPU features and other parameters (such as CPUID level) that don't work. Until these issues are fixed, it's a good idea to avoid using host-model and use custom mode with just the CPU model from host capabilities XML."

http://libvirt.org/formatdomain.html#elementsCPU