linux-kernel - Re: [PATCH] x86/bugs: Remove X86_BUG_MMIO

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Message-ID: <20250414165104.2ivcicu32vfxk5qv@desk>
Date: Mon, 14 Apr 2025 09:51:04 -0700
From: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
To: Borislav Petkov <bp@...nel.org>
Cc: Andrew Cooper <andrew.cooper3@...rix.com>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	David Kaplan <david.kaplan@....com>, X86 ML <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Borislav Petkov (AMD)" <bp@...en8.de>
Subject: Re: [PATCH] x86/bugs: Remove X86_BUG_MMIO_UNKNOWN

On Mon, Apr 14, 2025 at 05:09:51PM +0200, Borislav Petkov wrote:
> From: "Borislav Petkov (AMD)" <bp@...en8.de>
> 
> Whack this thing because:
> 
> - the "unknown" handling is done only for this vuln and not for the
>   others
> 
> - it doesn't do anything besides reporting things differently. It
>   doesn't apply any mitigations - it is simply causing unnecessary
>   complications to the code which don't bring anything besides
>   maintenance overhead to what is already a very nasty spaghetti pile
> 
> - all the currently unaffected CPUs can also be in "unknown" status so
>   there's no need for special handling here
> 
> so get rid of it.
> 
> Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>

Reviewed-by: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>