Re: [PATCH v2] INSTALL: remove unsupported XEN_CONFIG_EXPERT from documentation

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Fri, 16 Jan 2026, Jan Beulich wrote:
> On 16.01.2026 04:08, dmukhin@xxxxxxx wrote:
> > --- a/INSTALL
> > +++ b/INSTALL
> > @@ -33,11 +33,11 @@ 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.
> 
> I fear this earlier paragraph needs editing as well, which will then
> make more clear that ...
> 
> > -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.
> > +This behavior can be overridden by enabling "Configure EXPERT features"
> > +in Kconfig (CONFIG_EXPERT).
> 
> ... this may not be quite adequate.
> 

I am not sure how you would like to change the earlier paragraph or this
paragraph. I gave it a try and removed both paragraphs, replacing it
with this:

"""
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
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.
"""

What do you think?


> > However, resulting configurations do not
> > +receive security support. In addition, CONFIG_EXPERT permits the
> > +selection of experimental and potentially unsafe feature combinations
> > +without generating configuration warnings.