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

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Date:   Fri, 11 Mar 2022 13:51:38 -0700
From:   Jonathan Corbet <corbet@....net>
To:     Vincent Whitchurch <vincent.whitchurch@...s.com>,
        Jeff Dike <jdike@...toit.com>,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>
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: Re: [PATCH] docs: UML: Mention telnetd for port channel

Vincent Whitchurch <vincent.whitchurch@...s.com> writes:

> 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.

Applied, thanks.

jon