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>
---
 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

On 10/03/2022 12:42, Vincent Whitchurch wrote:
> 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>
> ---
>   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.
>   
> 

Acked-by: Anton Ivanov <anton.ivanov@cambridgegreys.com>

-- 
Anton R. Ivanov
Cambridgegreys Limited. Registered in England. Company Number 10273661
https://www.cambridgegreys.com/

Vincent Whitchurch <vincent.whitchurch@axis.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@axis.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