nixos/vm: init

lib/flake-helpers.nix

@@ -77,10 +77,8 @@ in
         };
 
         "nixosVMs/${hostname}" = mkApp {
-          drv = pkgs.writeShellScriptBin "run-${hostname}-vm" ''
-            env QEMU_OPTS="''${QEMU_OPTS:--cpu max -smp 4 -m 4096M -machine type=q35}" \
-              ${config.system.build.vm}/bin/run-${hostname}-vm
-          '';
+          drv = config.system.build.vm;
+          exePath = "/bin/run-${hostname}-vm";
         };
       };
     };

nixos/system/default.nix

@@ -8,6 +8,7 @@ in
     ./cli.nix
     ./btrfs.nix
     ./smart.nix
+    ./vm.nix
   ];
 
   options.nixos.system = {

nixos/system/vm.nix

@@ -0,0 +1,25 @@
+{ config, lib, ... }:
+
+let
+  cfg = config.nixos.system.vm;
+in
+{
+  options.nixos.system.vm = {
+    enable = lib.mkEnableOption "Virtual Machine config" // { default = true; };
+    vmConfig = lib.mkOption {
+      type = lib.types.attrs;
+      description = "Virtualisation options";
+      default = {
+        memorySize = 4096;
+        cores = 4;
+      };
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    virtualisation = {
+      vmVariant = { virtualisation = cfg.vmConfig; };
+      vmVariantWithBootLoader = { virtualisation = cfg.vmConfig; };
+    };
+  };
+}