linux-kernel - Re: [regression] microcode files missing in initramfs imgages from dracut (was Re: [PATCH] x86: Clean up remaining references to CONFIG_MICROCODE

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Message-ID: <20231124133303.GBZWCmD71R5dunBLQ3@fat_crate.local>
Date:   Fri, 24 Nov 2023 14:33:03 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Antonio Feijoo <antonio.feijoo@...e.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux regressions mailing list <regressions@...ts.linux.dev>,
        lukas.bulwahn@...il.com, dave.hansen@...ux.intel.com,
        hpa@...or.com, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org, mingo@...hat.com, tglx@...utronix.de,
        x86@...nel.org
Subject: Re: [regression] microcode files missing in initramfs imgages from
 dracut (was Re: [PATCH] x86: Clean up remaining references to
 CONFIG_MICROCODE_AMD)

On Fri, Nov 24, 2023 at 02:15:02PM +0100, Antonio Feijoo wrote:
> The problem I see is having to add a new patch with a new note every
> time a user space application requires new information to query.

Yeah, this is how it should work. The mere addition of the note would
document that userspace uses a certain aspect of the kernel machinery
and then we will know not to break it.

> And also new dracuts will be broken with older kernels that do not
> contain this info.

Yes, the meaning of the absence of the note would be: the kernel doesn't
provide that functionality. If you want it, upgrade your kernel.

> But (from a user space application point of view) if you (the kernel
> devs) are ok with this approach, I don't see why we can at least get
> some info from there.

Yes, my goal is to have some machinery which both sides agree upon and
have that proper contract in place vs you guys using things which are
internal and us breaking them unknowingly.

But Linus isn't that crazy about the note thing so I'd prefer if he
comments on what we should do instead.

> Just follow the Conventional Commit style for the commit messages, but
> that's also specified in the HACKING.md doc.

Thx, lemme get cracking on fancy github workflows. :-P

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette