* $out/bin/qemu-kvm should point to qemu-system-aarch64 on aarch64, libvirt expect it
* makeWrapper codes are separated as some architectures might require additional command flags (https://github.com/NixOS/nixpkgs/issues/31606#issuecomment-349675127)
* x86_64-on-i686 is not a native emulation and not supported by KVM, so it is removed from the list