linux-kernel - Re: [PATCH] x86: add hintable NOPs emulation

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Message-ID: <20250820095556.GEaKWbrMh24T7jTfBg@fat_crate.local>
Date: Wed, 20 Aug 2025 11:55:56 +0200
From: Borislav Petkov <bp@...en8.de>
To: Marcos Del Sol Vives <marcos@...a.pet>
Cc: "Ahmed S. Darwish" <darwi@...utronix.de>, linux-kernel@...r.kernel.org,
	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>, Brian Gerst <brgerst@...il.com>,
	Uros Bizjak <ubizjak@...il.com>, Ard Biesheuvel <ardb@...nel.org>,
	David Kaplan <david.kaplan@....com>, Kees Cook <kees@...nel.org>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	Oleg Nesterov <oleg@...hat.com>, "Xin Li (Intel)" <xin@...or.com>,
	Sabyrzhan Tasbolatov <snovitoll@...il.com>
Subject: Re: [PATCH] x86: add hintable NOPs emulation

On Wed, Aug 20, 2025 at 11:51:27AM +0200, Marcos Del Sol Vives wrote:
> I mean, they should know what they need to recompile if they want to, not
> just that their machine is having a bug triggered by some binary.

And what's stopping you from writing a proper error message explaining that?

And issuing that error message *exactly once* instead of flooding dmesg for no
good reason?

-- 
Regards/Gruss,
    Boris.

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