rework modules

Signed-off-by: unexplrd <unexplrd@linerds.us>

modules/nixos/system/virt/libvirt.nix

@@ -0,0 +1,35 @@
+{
+  pkgs,
+  config,
+  lib,
+  ...
+}:
+with lib; let
+  cfg = config.module.virt.libvirt;
+in {
+  options = {
+    module.virt.libvirt.enable =
+      mkEnableOption "enables virtualisation";
+  };
+  config = mkIf cfg.enable {
+    virtualisation.libvirtd = {
+      enable = true;
+      qemu = {
+        package = pkgs.qemu_kvm;
+        runAsRoot = false;
+        swtpm.enable = true;
+        vhostUserPackages = [pkgs.virtiofsd];
+        ovmf = {
+          enable = true;
+          packages = [
+            (pkgs.OVMF.override {
+              secureBoot = true;
+              tpmSupport = true;
+            })
+            .fd
+          ];
+        };
+      };
+    };
+  };
+}