force software emulation. C<kvm>, which means to force KVM and fail
if KVM is unavailable.
+=item B<--cpu>=CPU
+
+Set the qemu I<--cpu> option. If not set then a suitable default is
+picked depending on the architecture and whether KVM is available.
+You can also use I<--cpu=> to let qemu pick the default.
+
=item B<-i> INITRD
=item B<--initrd>=INITRD