What about re-adding minimal QEMU support? Would be useful during development. Then one could try Whonix-Host inside VirtualBox or any other virtualizer.
Only two changes required looks like. Changing domain type from kvm to qemu and disabling host cpu passthrough.
virsh -c qemu:///system net-start "Whonix-External"
shows
error: failed to start network Whonix-External
error: internal error: Network is already in use by interface eth0
Any idea how to fix that one?
Could be because I am testing inside VirtualBox but would be useful to fix this nonetheless.