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# SPDX-License-Identifier: GPL-2.0
menu "UML Character Devices"
config STDERR_CONSOLE
bool "stderr console"
default y
help
console driver which dumps all printk messages to stderr.
config SSL
bool "Virtual serial line"
help
The User-Mode Linux environment allows you to create virtual serial
lines on the UML that are usually made to show up on the host as
ttys or ptys.
See <http://user-mode-linux.sourceforge.net/old/input.html> for more
information and command line examples of how to use this facility.
Unless you have a specific reason for disabling this, say Y.
config NULL_CHAN
bool "null channel support"
help
This option enables support for attaching UML consoles and serial
lines to a device similar to /dev/null. Data written to it disappears
and there is never any data to be read.
config PORT_CHAN
bool "port channel support"
help
This option enables support for attaching UML consoles and serial
lines to host portals. They may be accessed with 'telnet <host>
<port number>'. Any number of consoles and serial lines may be
attached to a single portal, although what UML device you get when
you telnet to that portal will be unpredictable.
It is safe to say 'Y' here.
config PTY_CHAN
bool "pty channel support"
help
This option enables support for attaching UML consoles and serial
lines to host pseudo-terminals. Access to both traditional
pseudo-terminals (/dev/pty*) and pts pseudo-terminals are controlled
with this option. The assignment of UML devices to host devices
will be announced in the kernel message log.
It is safe to say 'Y' here.
config TTY_CHAN
bool "tty channel support"
help
This option enables support for attaching UML consoles and serial
lines to host terminals. Access to both virtual consoles
(/dev/tty*) and the slave side of pseudo-terminals (/dev/ttyp* and
/dev/pts/*) are controlled by this option.
It is safe to say 'Y' here.
config XTERM_CHAN
bool "xterm channel support"
help
This option enables support for attaching UML consoles and serial
lines to xterms. Each UML device so assigned will be brought up in
its own xterm.
It is safe to say 'Y' here.
config XTERM_CHAN_DEFAULT_EMULATOR
string "xterm channel default terminal emulator"
depends on XTERM_CHAN
default "xterm"
help
This option allows changing the default terminal emulator.
config NOCONFIG_CHAN
bool
default !(XTERM_CHAN && TTY_CHAN && PTY_CHAN && PORT_CHAN && NULL_CHAN)
config CON_ZERO_CHAN
string "Default main console channel initialization"
default "fd:0,fd:1"
help
This is the string describing the channel to which the main console
will be attached by default. This value can be overridden from the
command line. The default value is "fd:0,fd:1", which attaches the
main console to stdin and stdout.
It is safe to leave this unchanged.
config CON_CHAN
string "Default console channel initialization"
default "xterm"
help
This is the string describing the channel to which all consoles
except the main console will be attached by default. This value can
be overridden from the command line. The default value is "xterm",
which brings them up in xterms.
It is safe to leave this unchanged, although you may wish to change
this if you expect the UML that you build to be run in environments
which don't have X or xterm available.
config SSL_CHAN
string "Default serial line channel initialization"
default "pty"
help
This is the string describing the channel to which the serial lines
will be attached by default. This value can be overridden from the
command line. The default value is "pty", which attaches them to
traditional pseudo-terminals.
It is safe to leave this unchanged, although you may wish to change
this if you expect the UML that you build to be run in environments
which don't have a set of /dev/pty* devices.
config UML_SOUND
tristate "Sound support"
depends on SOUND
select SOUND_OSS_CORE
help
This option enables UML sound support. If enabled, it will pull in
the UML hostaudio relay, which acts as a intermediary
between the host's dsp and mixer devices and the UML sound system.
It is safe to say 'Y' here.
endmenu
menu "UML Network Devices"
depends on NET
config UML_NET_VECTOR
bool "Vector I/O high performance network devices"
select MAY_HAVE_RUNTIME_DEPS
help
This User-Mode Linux network driver uses multi-message send
and receive functions. The host running the UML guest must have
a linux kernel version above 3.0 and a libc version > 2.13.
This driver provides tap, raw, gre and l2tpv3 network transports.
For more information, including explanations of the networking
and sample configurations, see
<file:Documentation/virt/uml/user_mode_linux_howto_v2.rst>.
endmenu
config VIRTIO_UML
bool "UML driver for virtio devices"
select VIRTIO
help
This driver provides support for virtio based paravirtual device
drivers over vhost-user sockets.
config UML_RTC
bool "UML RTC driver"
depends on RTC_CLASS
# there's no use in this if PM_SLEEP isn't enabled ...
depends on PM_SLEEP
help
When PM_SLEEP is configured, it may be desirable to wake up using
rtcwake, especially in time-travel mode. This driver enables that
by providing a fake RTC clock that causes a wakeup at the right
time.
config UML_PCI
bool
select FORCE_PCI
select UML_IOMEM_EMULATION
select UML_DMA_EMULATION
select PCI_MSI
select PCI_LOCKLESS_CONFIG
config UML_PCI_OVER_VIRTIO
bool "Enable PCI over VIRTIO device simulation"
# in theory, just VIRTIO is enough, but that causes recursion
depends on VIRTIO_UML
select UML_PCI
config UML_PCI_OVER_VIRTIO_DEVICE_ID
int "set the virtio device ID for PCI emulation"
default -1
depends on UML_PCI_OVER_VIRTIO
help
There's no official device ID assigned (yet), set the one you
wish to use for experimentation here. The default of -1 is
not valid and will cause the driver to fail at probe.
config UML_PCI_OVER_VFIO
bool "Enable VFIO-based PCI passthrough"
select UML_PCI
help
This driver provides support for VFIO-based PCI passthrough.
Currently, only MSI-X capable devices are supported, and it
is assumed that drivers will use MSI-X.
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