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

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


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.


Julien Grall

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