wip: migrate client modules

modules-clone/nixos/optional/virtualbox.nix

@@ -0,0 +1,35 @@
+{ lib, config, pkgs, ... }:
+{
+  config = {
+    # specialisation = {
+    #   VBox.configuration = {
+    virtualisation.virtualbox = {
+      host = {
+        enable = true;
+        enableKvm = true;
+        addNetworkInterface = lib.mkIf config.virtualisation.virtualbox.host.enableKvm false;
+        package = pkgs.virtualbox;
+        enableExtensionPack = true;
+      };
+      # leaving this here for future notice. setting guest.enable = true will make 'restarting sysinit-reactivation.target' take till timeout on nixos-rebuild switch
+      guest = {
+        enable = false;
+      };
+    };
+    # run an older kernel to provide compatibility with windows vm
+    # boot = {
+    #   kernelPackages = lib.mkForce pkgs.stable24_05.linuxPackages;
+    #   # kernelParams = [
+    #   #   "amd_iommu=on"
+    #   # ];
+    # };
+
+
+    # fixes the issue of running together with QEMU
+    # NOTE: once you start a QEMU VM (use kvm) VirtualBox will fail to start VMs
+    # boot.kernelParams = [ "kvm.enable_virt_at_load=0" ];
+    #   };
+    # };
+  };
+
+}