Re: [Xen-devel] [PATCH 0/6] arm: more kconfig configurability and small default configs

[Julien Grall <julien.grall@xxxxxxx>]

On 18/04/18 23:15, Stefano Stabellini wrote:
> Hi all,
Hi,

> This patch series is the first step toward building a small certifiable
> Xen hypervisor for ARM boards.
>
> First, the series makes a few changes to allow disabling more kconfig
> options: most of them already exist but cannot be disabled.
>
> Then, it introduces a reference kconfig for Renesas RCar (due to popular
> demand, candidate for certifications) and for QEMU aarch64 (not for
> certifications, but useful for debugging).
While I could be tempt by more option to be configurable in Kconfig with 
some caveats (see below), I quite dislike the idea of providing a config 
per board. A few reasons:
        - Where do we draw the line on config we accept for a given board?
        - Do we have to test them every release?
        - What if we add a new option?
        - What does it mean in term of security support?

Regarding the Kconfig, allowing more option to be selected by the user 
means that it will increasingly be more difficult for the community to 
help user in debug. More that we today don't provide a way to embed the 
.config in Xen binary. So if you happen to clean you repo, then you are 
screw to reproduce it.
Furthermore, if we decide to impose CONFIG_XEN_EXPERT=y when using those 
.config, then you happen to drop one by mistake you end up rewrite you 
.config which is not really nice.
Cheers,

--
Julien Grall

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