anchor.diff:            -name ${vmName} \
             -m ${toString config.virtualisation.memorySize} \
             ${optionalString (pkgs.stdenv.system == "x86_64-linux") "-cpu kvm64"} \
  -          ${concatStringsSep " " config.virtualisation.qemuNetworkingOptions} \
  +          ${concatStringsSep " " config.virtualisation.qemu.networkingOptions} \
             -virtfs local,path=/nix/store,security_model=none,mount_tag=store \
             -virtfs local,path=$TMPDIR/xchg,security_model=none,mount_tag=xchg \
             -virtfs local,path=''${SHARED_DIR:-$TMPDIR/xchg},security_model=none,mount_tag=shared \
  
positive.code:           '';
        };
  
      virtualisation.qemuNetworkingOptions =
        mkOption {
          default = [
            "-net nic,vlan=0,model=virtio"
            "-net user,vlan=0\${QEMU_NET_OPTS:+,$QEMU_NET_OPTS}"
          ];
          type = types.listOf types.str;
          description = ''
            Networking-related command-line options that should be passed to qemu.
            The default is to use userspace networking (slirp).
  
            If you override this option, be adviced to keep
            ''${QEMU_NET_OPTS:+,$QEMU_NET_OPTS} (as seen in the default)
            to keep the default runtime behaviour.
          '';
        };
  
      virtualisation.graphics =
        mkOption {
          default = true;
  
negative.code:         description = "Primary IP address used in /etc/hosts.";
        };
  
      virtualisation.qemu = {
        options =
          mkOption {
            default = [];
            example = [ "-vga std" ];
            description = "Options passed to QEMU.";
          };
  
        networkingOptions =
          mkOption {
            default = [
              "-net nic,vlan=0,model=virtio"
              "-net user,vlan=0\${QEMU_NET_OPTS:+,$QEMU_NET_OPTS}"
            ];
            type = types.listOf types.str;
            description = ''
              Networking-related command-line options that should be passed to qemu.
              The default is to use userspace networking (slirp).
  
              If you override this option, be adviced to keep
              ''${QEMU_NET_OPTS:+,$QEMU_NET_OPTS} (as seen in the default)
              to keep the default runtime behaviour.
            '';
          };
      };
  
      virtualisation.useBootLoader =
        mkOption {
  