Re: [PATCH v3] xen: EXPERT clean-up and introduce UNSUPPORTED

[Jan Beulich <jbeulich@xxxxxxxx>]

On 23.01.2021 03:19, Stefano Stabellini wrote:
> --- a/xen/Kconfig
> +++ b/xen/Kconfig
> @@ -34,8 +34,15 @@ config DEFCONFIG_LIST
>       option defconfig_list
>       default ARCH_DEFCONFIG
>  
> +config UNSUPPORTED
> +     bool "Configure UNSUPPORTED features"
> +     help
> +       This option allows certain unsupported Xen options to be changed,
> +       which includes non-security-supported, experimental, and tech
> +       preview features as defined by SUPPORT.md.

And by implication anything not depending on UNSUPPORTED is
supported? I didn't think this was the case (some unsupported
code can't even be turned off via Kconfig), so I think this
needs clarifying here, so we won't end up with people
considering some feature supported which really isn't. That's
irrespective of the reference to SUPPORT.md.

>  config EXPERT
> -     bool "Configure standard Xen features (expert users)"
> +     bool "Configure EXPERT features"
>       help
>         This option allows certain base Xen options and settings
>         to be disabled or tweaked. This is for specialized environments

I'd like to suggest to move UNSUPPORTED past this one, to
then have that have "default EXPERT".

Jan