First download the guix qcow image here:

https://guix.gnu.org/manual/en/html_node/Running-Guix-in-a-VM.html

Then in the same dir put the following in a bash script:

#+begin_src sh
  #!/usr/bin/env bash

  qemu-system-x86_64 \
     -nic user,model=virtio-net-pci \
     -enable-kvm -m 2048 \
     -device virtio-blk,drive=myhd \
     -drive if=none,file=guix-system-vm-image-1.4.0.x86_64-linux.qcow2,id=myhd \
     -device virtio-serial \
     -chardev socket,path=/tmp/foo,server=on,wait=off,id=foo \
     -device virtserialport,chardev=foo,name=org.fedoraproject.port.0
#+end_src

And then do :

#+begin_src sh
  ls -alh /sys/class/virtio-ports/
#+end_src

According to this link there should be something but I'dont see anything on my end