linux-kernel - Re: [PATCH] x86/ACPI: invalidate all cache lines on ACPI C-state transitions

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Message-ID: <20250526160753.GS39944@noisy.programming.kicks-ass.net>
Date: Mon, 26 May 2025 18:07:53 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Khalid Ali <khaliidcaliy@...il.com>
Cc: bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com,
	lenb@...nel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, mingo@...hat.com, rafael@...nel.org,
	tglx@...utronix.de, x86@...nel.org
Subject: Re: [PATCH] x86/ACPI: invalidate all cache lines on ACPI C-state
 transitions

On Mon, May 26, 2025 at 01:45:33PM +0000, Khalid Ali wrote:
> > This is absolutely insane. This day and age, nobody should use WBINVD
> > ever. We've managed to not do this for decades, and I'm thinking that
> > either the SPEC is 'mistaken' or otherwise out of line with reality.
> 
> > If you hate performance, and you want to break things like CAT, feel
> > free to put this in your own kernel.
> Sorry, i made a mistake, i meant ACPI 6.4 and 6.5. I already resent this patch
> please check the resended one.

Doesn't matter. We're categorically not going to be doing this. Rafael,
who do we kick to get the ACPI SPEC fixed?