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Re: [PATCH v2 2/2] x86/ucode: Add Kconfig option to remove microcode loading
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 13 Jan 2026 09:58:03 +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>, Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 13 Jan 2026 08:58:32 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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).
Jan
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