nixos-config/modules/system/vm.nix

{
    config,
    pkgs,
    lib,
    ...
}: {
    options.myConfig.vm.qemu.enable = lib.mkEnableOption "";

    config = lib.mkIf config.myConfig.vm.qemu.enable {
        virtualisation.libvirtd.enable = true;

        programs.virt-manager.enable = true;

        environment.systemPackages = [
            pkgs.quickemu
            pkgs.quickgui
        ];

        home-manager.sharedModules = [
            {
                dconf.settings."org/virt-manager/virt-manager/connections" = {
                    autoconnect = ["qemu:///system"];
                    uris = ["qemu:///system"];
                };
            }
        ];
    };
}