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Re: [PATCH RESEND 2/2] xen: Allow EXPERT mode to be selected from the menuconfig directly

Hi Jan,

On 12/05/2020 11:15, Jan Beulich wrote:
On 12.05.2020 12:08, Julien Grall wrote:
On 12/05/2020 08:18, Jan Beulich wrote:
On 11.05.2020 19:14, Ian Jackson wrote:
Jan Beulich writes ("Re: [PATCH RESEND 2/2] xen: Allow EXPERT mode to be selected 
from the menuconfig directly"):
I'm trying to make the point that your patch, to me, looks to be
trying to overcome a problem for which we have had a solution all
the time.

Thanks for this clear statement of your objection.  I'm afraid I don't
agree.  Even though .config exists (and is even used by osstest, so I
know about it) I don't think it is as good as having it in

But you realize that my objection is (was) more towards the reasoning
behind the change, than towards the change itself. If, as a community,
we decide to undo what we might now call a mistake, and if we're ready
to deal with the consequences, so be it.

Would you mind to explain the fall out you expect from this patch? Are
you worry more people may contact security@xxxxxxx for non-security issue?

That's one possible thing that might happen. But even more generally
the likelihood will increase that people report issues without paying
attention that they depend on their choice of configuration.
I agree that you are going to get more report because there are more users to try new things. So inevitently, you will get more incomplete report. This is always the downside of allowing more flexibility.

But we also need to look at the upside. I can see 2 advantages:
1) It will be easier to try upcoming features (e.g Argo). The more testing and input, the more chance a feature will be a success.
    2) It will be easier to tailor Xen (such as built-in command line).

In both cases, you make Xen more compelling because you allow to experiment and make it more flexible. IHMO, this is one of the best way to attract users and possible new contributors/reviewers to Xen community.

have to both take this into consideration and ask back for the
specific .config they've used.
Correct me if I am wrong, but this is not very specific to EXPERT mode. You can already select different options that will affect the behavior of the hypervisor. For instance, on x86, you can disable PV guest support. How do you figure that out today without asking the .config?


Julien Grall



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