linux-kernel - Re: [PATCH RESEND v2 3/3] x86/cpu: Enable modifying bug flags with {clear,set}puid

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Message-ID: <20250217192221.GHZ7OMbf-bgNWZ8coq@fat_crate.local>
Date: Mon, 17 Feb 2025 20:22:21 +0100
From: Borislav Petkov <bp@...en8.de>
To: Brendan Jackman <jackmanb@...gle.com>
Cc: Jonathan Corbet <corbet@....net>, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v2 3/3] x86/cpu: Enable modifying bug flags with
 {clear,set}puid

On Mon, Feb 17, 2025 at 06:20:33PM +0100, Brendan Jackman wrote:
> But for bugs, they all have a name. I was thinking that this was
> because they are defined by the kernel, that's what I meant by "It t
> doesn't make sense for a bug not to have a name", although now I think
> about it we could totally have a bug and not give it a user-visible
> name if we wanted to.

Right.

> Anyway, still think the current logic is what we want here:
> 
> - The new setcpuid should be consistent with the existing clearcpuid,
> i.e. accept numbers for the same things clearcpuid does.
> 
> - There are currently no bugs without names so for those, require the
> string for both setcpuid and clearcpuid. If we wanted to we could add
> number support later.

Right, let's not make this more than it is - a hacky interface for hacks - not
to be used in production anyway. :-)

Thx.

-- 
Regards/Gruss,
    Boris.

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