This has just happened to me. For some reason, all my machines had
After an update in yakkety, they stopped working.
$ qemu-system-x86_64 -enable-kvm -machine help | grep wily
So I updated the machine xml to a supported machine as Charles
suggested, and they work again.
Here's the note for my future self about how to do the update:
$ virsh dumpxml $machine-name > /tmp/machine.xml
Edit the xml.
$ virsh define /tmp/machine.xml
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libvirt fails to start VirtualMachines
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