nix-config/modules/nixos/virtualisation/qemu.nix

{
  flake.modules.nixos.virtualisation = {
    config,
    lib,
    pkgs,
    userName,
    ...
  }: let
    cfg = config.tnix.virtualisation;
  in {
    options.tnix.virtualisation.qemu = {
      enable = lib.mkEnableOption "QEMU/KVM virtualization with libvirtd";
    };

    config = lib.mkIf cfg.qemu.enable {
      virtualisation = {
        libvirtd = {
          enable = true;
          qemu = {
            swtpm.enable = true;
          };
        };
        spiceUSBRedirection.enable = true;
      };

      users.users.${userName}.extraGroups = ["libvirtd"];

      environment.systemPackages = with pkgs; [
        virt-manager
        virt-viewer
      ];
    };
  };
}