From 4ef5a0b2e1b806203831b0a7a044539f6627116a Mon Sep 17 00:00:00 2001 From: Vincent Whitchurch <vincent.whitchurch@axis.com> Date: Thu, 10 Mar 2022 13:42:30 +0100 Subject: [PATCH] docs: UML: Mention telnetd for port channel It is not obvious from the documentation that using the "port" channel for the console requires telnetd to be installed (see port_connection() in arch/um/drivers/port_user.c). Mention this, and the fact that UML will not boot until a client connects. Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com> Acked-by: Anton Ivanov <anton.ivanov@cambridgegreys.com> Signed-off-by: Richard Weinberger <richard@nod.at> --- Documentation/virt/uml/user_mode_linux_howto_v2.rst | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/Documentation/virt/uml/user_mode_linux_howto_v2.rst b/Documentation/virt/uml/user_mode_linux_howto_v2.rst index 81986fe014d4b..863f67b72c05d 100644 --- a/Documentation/virt/uml/user_mode_linux_howto_v2.rst +++ b/Documentation/virt/uml/user_mode_linux_howto_v2.rst @@ -664,7 +664,11 @@ one is input, the second one output. * The fd channel - use file descriptor numbers for input/output. Example: ``con1=fd:0,fd:1.`` -* The port channel - listen on TCP port number. Example: ``con1=port:4321`` +* The port channel - start a telnet server on TCP port number. Example: + ``con1=port:4321``. The host must have /usr/sbin/in.telnetd (usually part of + a telnetd package) and the port-helper from the UML utilities (see the + information for the xterm channel below). UML will not boot until a client + connects. * The pty and pts channels - use system pty/pts.