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Re: [PATCH v2 2/2] x86/ucode: Add Kconfig option to remove microcode loading
- To: Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 13 Jan 2026 11:49:42 +0100
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- Cc: Doug Goldstein <cardoe@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 13 Jan 2026 10:50:03 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13.01.2026 11:45, Alejandro Vallejo wrote:
> On Tue Jan 13, 2026 at 9:58 AM CET, Jan Beulich wrote:
>> On 12.01.2026 18:15, Andrew Cooper wrote:
>>> On 12/01/2026 3:02 pm, Alejandro Vallejo wrote:
>>>> --- a/xen/arch/x86/Kconfig
>>>> +++ b/xen/arch/x86/Kconfig
>>>> @@ -331,8 +331,20 @@ config REQUIRE_NX
>>>> was unavailable. However, if enabled, Xen will no longer boot on
>>>> any CPU which is lacking NX support.
>>>>
>>>> -config UCODE_SCAN_DEFAULT
>>>> +config MICROCODE_LOADING
>>>> + bool "Microcode loading"
>>>> + default y
>>>> + help
>>>> + Support updating the microcode revision of available CPUs with a newer
>>>> + vendor-provided microcode blob. Microcode updates address some
>>>> classes of
>>>> + silicon defects. It's a very common delivery mechanism for fixes or
>>>> + workarounds for speculative execution vulnerabilities.
>>>> +
>>>> + If unsure, say Y.
>>>
>>> Please don't re-iterate the default. It's a waste.
>>
>> Well, first of all we should be consistent: Either we always have such a
>> brief
>> sentence in the help texts of boolean options, or we never have. Who knows -
>> cleaning this up thoughout the tree may even address some anomalies (where
>> the
>> sentence and the default setting disagree).
>
> Is that a request to add missing ones while fixing existing mismatches or
> remove
> them? Not as part of this series in any case, but do you have agreement on the
> course of action?
While I agree with Andrew that these statements are redundant, I wouldn't call
this "agreement" across all maintainers, at least not until a little more time
has passed.
Jan
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