linux-kernel - [PATCH] docs: UML: Mention telnetd for port channel

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Message-ID: <20220310124230.3069354-1-vincent.whitchurch@axis.com>
Date:   Thu, 10 Mar 2022 13:42:30 +0100
From:   Vincent Whitchurch <vincent.whitchurch@...s.com>
To:     Jeff Dike <jdike@...toit.com>, Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Jonathan Corbet <corbet@....net>
CC:     <kernel@...s.com>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        <linux-um@...ts.infradead.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
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@...s.com>
---
 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 2cafd3c3c6cb..d5ad96c795f6 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.
 
-- 
2.34.1