linux-kernel - Re: [PATCH v4 1/6] x86/cpu: Use a new feature flag for 5 level paging

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Message-ID: <20250522075553.GG24938@noisy.programming.kicks-ass.net>
Date: Thu, 22 May 2025 09:55:53 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>,
	"Ahmed S. Darwish" <darwi@...utronix.de>,
	Ard Biesheuvel <ardb+git@...gle.com>, linux-kernel@...r.kernel.org,
	x86@...nel.org, Ard Biesheuvel <ardb@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Brian Gerst <brgerst@...il.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>
Subject: Re: [PATCH v4 1/6] x86/cpu: Use a new feature flag for 5 level paging

On Wed, May 21, 2025 at 05:23:37PM +0200, Thomas Gleixner wrote:

>    4) Drivers having access to CPUID is just wrong. We've had issues
>       with that in the past because drivers evaluated CPUID themself and
>       missed that the core code had stuff disabled.

I had this patch that read the module instructions and failed loading if
they used 'fancy' instructions. Do you want me to revive that?