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Re: [PATCH v4 1/2] xen: EXPERT clean-up and introduce UNSUPPORTED
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
- Date: Tue, 26 Jan 2021 13:20:14 +0000
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- Cc: Ian Jackson <iwj@xxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>, "andrew.cooper3@xxxxxxxxxx" <andrew.cooper3@xxxxxxxxxx>, "george.dunlap@xxxxxxxxxx" <george.dunlap@xxxxxxxxxx>, "julien@xxxxxxx" <julien@xxxxxxx>, "wl@xxxxxxx" <wl@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 26 Jan 2021 13:20:30 +0000
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- Thread-topic: [PATCH v4 1/2] xen: EXPERT clean-up and introduce UNSUPPORTED
> On 26 Jan 2021, at 13:19, Jan Beulich <jbeulich@xxxxxxxx> wrote:
>
> On 26.01.2021 14:17, Ian Jackson wrote:
>> Jan Beulich writes ("Re: [PATCH v4 1/2] xen: EXPERT clean-up and introduce
>> UNSUPPORTED"):
>>> On 26.01.2021 12:17, Bertrand Marquis wrote:
>>>> Maybe something we could explain more clearly in the UNSUPPORTED/EXPERT
>>>> config parameters instead ?
>>>> We could also make that more clear in the help of such parameters directly.
>>>>
>>>> I do not see how we could make that more clear directly in the prompt (as
>>>> making it too long is not a good solution).
>>>
>>> My main request is that such tags be added only if there's
>>> absolutely no ambiguity. Anything else (requiring longer
>>> explanations in many cases) should be expressed in the help
>>> text of the option, or in yet other ways (a referral to
>>> SUPPORT.md comes to mind).
>>
>> Is
>>
>>>>>>> + bool "Harden the branch predictor against aliasing attacks
>>>>>>> (disabling UNSUPPORTED)" if UNSUPPORTED
>>
>> too long ?
>
> It may be tolerable, but it is getting longish imo.
I am also not quite sure this is making things clearer.
Bertrand
>
> Jan
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