1# SPDX-License-Identifier: GPL-2.0 2 3menu "UML Character Devices" 4 5config STDERR_CONSOLE 6 bool "stderr console" 7 default y 8 help 9 console driver which dumps all printk messages to stderr. 10 11config SSL 12 bool "Virtual serial line" 13 help 14 The User-Mode Linux environment allows you to create virtual serial 15 lines on the UML that are usually made to show up on the host as 16 ttys or ptys. 17 18 See <http://user-mode-linux.sourceforge.net/old/input.html> for more 19 information and command line examples of how to use this facility. 20 21 Unless you have a specific reason for disabling this, say Y. 22 23config NULL_CHAN 24 bool "null channel support" 25 help 26 This option enables support for attaching UML consoles and serial 27 lines to a device similar to /dev/null. Data written to it disappears 28 and there is never any data to be read. 29 30config PORT_CHAN 31 bool "port channel support" 32 help 33 This option enables support for attaching UML consoles and serial 34 lines to host portals. They may be accessed with 'telnet <host> 35 <port number>'. Any number of consoles and serial lines may be 36 attached to a single portal, although what UML device you get when 37 you telnet to that portal will be unpredictable. 38 It is safe to say 'Y' here. 39 40config PTY_CHAN 41 bool "pty channel support" 42 help 43 This option enables support for attaching UML consoles and serial 44 lines to host pseudo-terminals. Access to both traditional 45 pseudo-terminals (/dev/pty*) and pts pseudo-terminals are controlled 46 with this option. The assignment of UML devices to host devices 47 will be announced in the kernel message log. 48 It is safe to say 'Y' here. 49 50config TTY_CHAN 51 bool "tty channel support" 52 help 53 This option enables support for attaching UML consoles and serial 54 lines to host terminals. Access to both virtual consoles 55 (/dev/tty*) and the slave side of pseudo-terminals (/dev/ttyp* and 56 /dev/pts/*) are controlled by this option. 57 It is safe to say 'Y' here. 58 59config XTERM_CHAN 60 bool "xterm channel support" 61 help 62 This option enables support for attaching UML consoles and serial 63 lines to xterms. Each UML device so assigned will be brought up in 64 its own xterm. 65 It is safe to say 'Y' here. 66 67config NOCONFIG_CHAN 68 bool 69 default !(XTERM_CHAN && TTY_CHAN && PTY_CHAN && PORT_CHAN && NULL_CHAN) 70 71config CON_ZERO_CHAN 72 string "Default main console channel initialization" 73 default "fd:0,fd:1" 74 help 75 This is the string describing the channel to which the main console 76 will be attached by default. This value can be overridden from the 77 command line. The default value is "fd:0,fd:1", which attaches the 78 main console to stdin and stdout. 79 It is safe to leave this unchanged. 80 81config CON_CHAN 82 string "Default console channel initialization" 83 default "xterm" 84 help 85 This is the string describing the channel to which all consoles 86 except the main console will be attached by default. This value can 87 be overridden from the command line. The default value is "xterm", 88 which brings them up in xterms. 89 It is safe to leave this unchanged, although you may wish to change 90 this if you expect the UML that you build to be run in environments 91 which don't have X or xterm available. 92 93config SSL_CHAN 94 string "Default serial line channel initialization" 95 default "pty" 96 help 97 This is the string describing the channel to which the serial lines 98 will be attached by default. This value can be overridden from the 99 command line. The default value is "pty", which attaches them to 100 traditional pseudo-terminals. 101 It is safe to leave this unchanged, although you may wish to change 102 this if you expect the UML that you build to be run in environments 103 which don't have a set of /dev/pty* devices. 104 105config UML_SOUND 106 tristate "Sound support" 107 help 108 This option enables UML sound support. If enabled, it will pull in 109 soundcore and the UML hostaudio relay, which acts as a intermediary 110 between the host's dsp and mixer devices and the UML sound system. 111 It is safe to say 'Y' here. 112 113config SOUND 114 tristate 115 default UML_SOUND 116 117config SOUND_OSS_CORE 118 bool 119 default UML_SOUND 120 121config HOSTAUDIO 122 tristate 123 default UML_SOUND 124 125endmenu 126 127menu "UML Network Devices" 128 depends on NET 129 130# UML virtual driver 131config UML_NET 132 bool "Virtual network device" 133 help 134 While the User-Mode port cannot directly talk to any physical 135 hardware devices, this choice and the following transport options 136 provide one or more virtual network devices through which the UML 137 kernels can talk to each other, the host, and with the host's help, 138 machines on the outside world. 139 140 For more information, including explanations of the networking and 141 sample configurations, see 142 <http://user-mode-linux.sourceforge.net/old/networking.html>. 143 144 If you'd like to be able to enable networking in the User-Mode 145 linux environment, say Y; otherwise say N. Note that you must 146 enable at least one of the following transport options to actually 147 make use of UML networking. 148 149config UML_NET_ETHERTAP 150 bool "Ethertap transport" 151 depends on UML_NET 152 help 153 The Ethertap User-Mode Linux network transport allows a single 154 running UML to exchange packets with its host over one of the 155 host's Ethertap devices, such as /dev/tap0. Additional running 156 UMLs can use additional Ethertap devices, one per running UML. 157 While the UML believes it's on a (multi-device, broadcast) virtual 158 Ethernet network, it's in fact communicating over a point-to-point 159 link with the host. 160 161 To use this, your host kernel must have support for Ethertap 162 devices. Also, if your host kernel is 2.4.x, it must have 163 CONFIG_NETLINK_DEV configured as Y or M. 164 165 For more information, see 166 <http://user-mode-linux.sourceforge.net/old/networking.html> That site 167 has examples of the UML command line to use to enable Ethertap 168 networking. 169 170 If you'd like to set up an IP network with the host and/or the 171 outside world, say Y to this, the Daemon Transport and/or the 172 Slip Transport. You'll need at least one of them, but may choose 173 more than one without conflict. If you don't need UML networking, 174 say N. 175 176config UML_NET_TUNTAP 177 bool "TUN/TAP transport" 178 depends on UML_NET 179 help 180 The UML TUN/TAP network transport allows a UML instance to exchange 181 packets with the host over a TUN/TAP device. This option will only 182 work with a 2.4 host, unless you've applied the TUN/TAP patch to 183 your 2.2 host kernel. 184 185 To use this transport, your host kernel must have support for TUN/TAP 186 devices, either built-in or as a module. 187 188config UML_NET_SLIP 189 bool "SLIP transport" 190 depends on UML_NET 191 help 192 The slip User-Mode Linux network transport allows a running UML to 193 network with its host over a point-to-point link. Unlike Ethertap, 194 which can carry any Ethernet frame (and hence even non-IP packets), 195 the slip transport can only carry IP packets. 196 197 To use this, your host must support slip devices. 198 199 For more information, see 200 <http://user-mode-linux.sourceforge.net/old/networking.html>. 201 has examples of the UML command line to use to enable slip 202 networking, and details of a few quirks with it. 203 204 The Ethertap Transport is preferred over slip because of its 205 limitations. If you prefer slip, however, say Y here. Otherwise 206 choose the Multicast transport (to network multiple UMLs on 207 multiple hosts), Ethertap (to network with the host and the 208 outside world), and/or the Daemon transport (to network multiple 209 UMLs on a single host). You may choose more than one without 210 conflict. If you don't need UML networking, say N. 211 212config UML_NET_DAEMON 213 bool "Daemon transport" 214 depends on UML_NET 215 help 216 This User-Mode Linux network transport allows one or more running 217 UMLs on a single host to communicate with each other, but not to 218 the host. 219 220 To use this form of networking, you'll need to run the UML 221 networking daemon on the host. 222 223 For more information, see 224 <http://user-mode-linux.sourceforge.net/old/networking.html> That site 225 has examples of the UML command line to use to enable Daemon 226 networking. 227 228 If you'd like to set up a network with other UMLs on a single host, 229 say Y. If you need a network between UMLs on multiple physical 230 hosts, choose the Multicast Transport. To set up a network with 231 the host and/or other IP machines, say Y to the Ethertap or Slip 232 transports. You'll need at least one of them, but may choose 233 more than one without conflict. If you don't need UML networking, 234 say N. 235 236config UML_NET_VECTOR 237 bool "Vector I/O high performance network devices" 238 depends on UML_NET 239 help 240 This User-Mode Linux network driver uses multi-message send 241 and receive functions. The host running the UML guest must have 242 a linux kernel version above 3.0 and a libc version > 2.13. 243 This driver provides tap, raw, gre and l2tpv3 network transports 244 with up to 4 times higher network throughput than the UML network 245 drivers. 246 247config UML_NET_VDE 248 bool "VDE transport" 249 depends on UML_NET 250 help 251 This User-Mode Linux network transport allows one or more running 252 UMLs on a single host to communicate with each other and also 253 with the rest of the world using Virtual Distributed Ethernet, 254 an improved fork of uml_switch. 255 256 You must have libvdeplug installed in order to build the vde 257 transport into UML. 258 259 To use this form of networking, you will need to run vde_switch 260 on the host. 261 262 For more information, see <http://wiki.virtualsquare.org/> 263 That site has a good overview of what VDE is and also examples 264 of the UML command line to use to enable VDE networking. 265 266 If you need UML networking with VDE, 267 say Y. 268 269config UML_NET_MCAST 270 bool "Multicast transport" 271 depends on UML_NET 272 help 273 This Multicast User-Mode Linux network transport allows multiple 274 UMLs (even ones running on different host machines!) to talk to 275 each other over a virtual ethernet network. However, it requires 276 at least one UML with one of the other transports to act as a 277 bridge if any of them need to be able to talk to their hosts or any 278 other IP machines. 279 280 To use this, your host kernel(s) must support IP Multicasting. 281 282 For more information, see 283 <http://user-mode-linux.sourceforge.net/old/networking.html> That site 284 has examples of the UML command line to use to enable Multicast 285 networking, and notes about the security of this approach. 286 287 If you need UMLs on multiple physical hosts to communicate as if 288 they shared an Ethernet network, say Y. If you need to communicate 289 with other IP machines, make sure you select one of the other 290 transports (possibly in addition to Multicast; they're not 291 exclusive). If you don't need to network UMLs say N to each of 292 the transports. 293 294config UML_NET_PCAP 295 bool "pcap transport" 296 depends on UML_NET 297 help 298 The pcap transport makes a pcap packet stream on the host look 299 like an ethernet device inside UML. This is useful for making 300 UML act as a network monitor for the host. You must have libcap 301 installed in order to build the pcap transport into UML. 302 303 For more information, see 304 <http://user-mode-linux.sourceforge.net/old/networking.html> That site 305 has examples of the UML command line to use to enable this option. 306 307 If you intend to use UML as a network monitor for the host, say 308 Y here. Otherwise, say N. 309 310config UML_NET_SLIRP 311 bool "SLiRP transport" 312 depends on UML_NET 313 help 314 The SLiRP User-Mode Linux network transport allows a running UML 315 to network by invoking a program that can handle SLIP encapsulated 316 packets. This is commonly (but not limited to) the application 317 known as SLiRP, a program that can re-socket IP packets back onto 318 he host on which it is run. Only IP packets are supported, 319 unlike other network transports that can handle all Ethernet 320 frames. In general, slirp allows the UML the same IP connectivity 321 to the outside world that the host user is permitted, and unlike 322 other transports, SLiRP works without the need of root level 323 privleges, setuid binaries, or SLIP devices on the host. This 324 also means not every type of connection is possible, but most 325 situations can be accommodated with carefully crafted slirp 326 commands that can be passed along as part of the network device's 327 setup string. The effect of this transport on the UML is similar 328 that of a host behind a firewall that masquerades all network 329 connections passing through it (but is less secure). 330 331 To use this you should first have slirp compiled somewhere 332 accessible on the host, and have read its documentation. If you 333 don't need UML networking, say N. 334 335 Startup example: "eth0=slirp,FE:FD:01:02:03:04,/usr/local/bin/slirp" 336 337endmenu 338 339config VIRTIO_UML 340 tristate "UML driver for virtio devices" 341 select VIRTIO 342 help 343 This driver provides support for virtio based paravirtual device 344 drivers over vhost-user sockets. 345