diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index af6f6606..db757f2e 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -16,7 +16,7 @@ jobs:
           *.opam
           !ocaml-solo5-cross-aarch64.opam
     - name: Install ocaml-solo5 and dune
-      run: opam install ocaml-solo5 conf-libseccomp dune
+      run: opam install ocaml-solo5 conf-libseccomp dune fmt
     - name: Show the toolchain configuration
       run: |
         set -x
@@ -35,3 +35,17 @@ jobs:
       run: MODE=muen opam exec -- dune build --root example
     - name: Compile examples with xen
       run: MODE=xen opam exec -- dune build --root example
+    - name: Enable KVM group perms
+      run: |
+        echo 'KERNEL=="kvm", GROUP="kvm", MODE="0666", OPTIONS+="static_node=kvm"' | sudo tee /etc/udev/rules.d/99-kvm4all.rules
+        sudo udevadm control --reload-rules
+        sudo udevadm trigger --name-match=kvm
+        sudo apt-get update
+        sudo apt-get install -y libvirt-clients libvirt-daemon-system libvirt-daemon virtinst bridge-utils qemu-kvm qemu-system-x86
+        sudo usermod -a -G kvm,libvirt $USER
+    - name: Run a Solo5 unikernel (hvt)
+      run: |
+        opam exec -- dune describe location --root example --context solo5 --no-print-directory ./hello.exe &> unikernel.tmp
+        echo "UNIKERNEL=$(cat unikernel.tmp)" >> $GITHUB_ENV
+    - name: Run a simple Hello World!
+      run: opam exec -- solo5-hvt -- "example/$UNIKERNEL"
diff --git a/example/dune.inc b/example/dune.inc
index b885dfbd..5cfc9a76 100644
--- a/example/dune.inc
+++ b/example/dune.inc
@@ -10,7 +10,7 @@
   ; Force linking the manifest in
   -cclib
   "-u __solo5_mft1_note")
- (libraries solo5os)
+ (libraries solo5os fmt)
  (modes native))
 
 (rule
diff --git a/example/dune_gen.ml b/example/dune_gen.ml
index 508ad818..b5581cf2 100644
--- a/example/dune_gen.ml
+++ b/example/dune_gen.ml
@@ -52,7 +52,7 @@ let print_rule test exitcode extraifs extralibs =
     exitcode
 
 let _ =
-  print_rule "hello" None [] [];
+  print_rule "hello" None [] ["fmt"];
   print_rule "sysfail" (Some 2) [] [];
   print_rule "config" None [] [];
   print_rule "compilerlibsx86" None
diff --git a/example/hello.ml b/example/hello.ml
index ef16b82d..92c8f033 100644
--- a/example/hello.ml
+++ b/example/hello.ml
@@ -1 +1 @@
-let () = Printf.printf "Hello from OCaml on Solo5!\n%!";;
+let () = Fmt.pr "Hello from OCaml on Solo5!\n%!";;