[libvirt] How can I tell if I'm using qemu-kvm or qemu-kvm-ev from libvirt Python binding?

[Yaniv Kaul]

I'm trying to (optionally) use iothreads, which only exist on qemu-kvm-ev.
I was hoping to see it in the domcapabilities, but I don't see it there.
How do I know if it's supported or not?

TIA,
Y.
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