Re: [PATCH v3] INSTALL: remove unsupported XEN_CONFIG_EXPERT from documentation

[Jan Beulich <jbeulich@xxxxxxxx>]

On 20.01.2026 08:16, dmukhin@xxxxxxx wrote:
> From: Denis Mukhin <dmukhin@xxxxxxxx> 
> 
> Remove XEN_CONFIG_EXPERT explanation and also correct information in
> the entire "Xen Hypervisor" section.
> 
> Amends: 37339ba9ef46 ("automation: Remove XEN_CONFIG_EXPERT leftovers")
> Suggested-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> Signed-off-by: Denis Mukhin <dmukhin@xxxxxxxx>

Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
preferably with ...

> --- a/INSTALL
> +++ b/INSTALL
> @@ -25,19 +25,12 @@ Xen Hypervisor
>  Xen itself is configured via a `kconfig' system borrowed from Linux.
>  See https://www.kernel.org/doc/html/v5.4/kbuild/.
>  
> -Note that unlike with Linux, and contrary to that document, you cannot
> -look at Kconfig files, or the default or generated config files etc.,
> -to find available configuration options.  This is because it is only
> -supported (and security supported) by the Xen Project, to change a
> -small subset of the options.  Attempts to change other options will be
> -silently overridden.  The only way to find which configuration options
> -are available is to run `make menuconfig' or the like.
> -
> -You can counter-override this behaviour by setting XEN_CONFIG_EXPERT=y
> -in your environment.  However, doing this is not supported and the
> -resulting configurations do not receive security support.  If you set
> -this variable there is nothing stopping you setting dangerously
> -experimental combinations of features - not even any warnings.
> +Only a subset of options is supported or security-supported by Xen
> +Project. You can explore all available options, including unsupported
> +ones and those recommended only for expert users, by using `make

"..., e.g. by using ..."

> +menuconfig` and enabling `CONFIG_UNSUPPORTED` and/or `CONFIG_EXPERT`.
> +However, enabling these options is not supported, and configurations
> +resulting from them do not receive security support.
>  
>  Options recognized by configure
>  ===============================

Jan