Re: [PATCH] device-tree: Move Arm's static-evtchn feature to common

[Jan Beulich <jbeulich@suse.com>]

On 27.05.2025 10:21, Michal Orzel wrote:
> There's nothing Arm specific about this feature. Move it to common as
> part of a larger activity to commonalize device tree related features.
> For now, select it only for ARM until others (e.g. RISC-V) verify it
> works for them too.
> 
> Signed-off-by: Michal Orzel <michal.orzel@amd.com>

I realize this was already committed, but ...

> --- a/xen/common/Kconfig
> +++ b/xen/common/Kconfig
> @@ -162,6 +162,14 @@ config STATIC_MEMORY
>  
>  	  If unsure, say N.
>  
> +config STATIC_EVTCHN
> +	bool "Static event channel support on a dom0less system"
> +	depends on DOM0LESS_BOOT && ARM

... I think we should strive to avoid such arch dependencies; they simply
don't scale very well. Instead (if needed) HAS_* should be introduced, which
each interested arch can select. In the case here, however, perhaps
DOM0LESS_BOOT alone would have been sufficient as a dependency?

Jan