add xen-vm config

common/proxmox-vm/default.nix

 { ... }:
 
 {
-  services.qemuGuest.enable = true;
+    services.qemuGuest.enable = true;
 }

common/xen-vm/default.nix

+{ modulesPath, pkgs, ... }:
+
+{
+    imports = [
+        (modulesPath + "/virtualisation/xen-domU.nix")
+    ];
+    boot.kernelPackages = pkgs.linuxPackages_5_4;
+}