linux-kernel - Re: [PATCH 2/6] x86/bugs: Remove MDS command line

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Message-ID: <d0a71676-f782-44ea-9c66-60658b9d9330@linux.intel.com>
Date: Tue, 24 Sep 2024 15:41:19 -0700
From: Daniel Sneddon <daniel.sneddon@...ux.intel.com>
To: Dave Hansen <dave.hansen@...el.com>, Jonathan Corbet <corbet@....net>,
 Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...en8.de>,
 Peter Zijlstra <peterz@...radead.org>, Josh Poimboeuf <jpoimboe@...nel.org>,
 Ingo Molnar <mingo@...hat.com>, Dave Hansen <dave.hansen@...ux.intel.com>,
 x86@...nel.org
Cc: hpa@...or.com, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
 pawan.kumar.gupta@...ux.intel.com
Subject: Re: [PATCH 2/6] x86/bugs: Remove MDS command line

On 9/24/24 15:34, Dave Hansen wrote:
> On 9/24/24 15:31, Daniel Sneddon wrote:
>> -	mds=		[X86,INTEL,EARLY]
>> -			Control mitigation for the Micro-architectural Data
>> -			Sampling (MDS) vulnerability.
> 
> As much as I'd love to remove old code, won't this surprise users if we
> just take this away?
> 
> I suspect the _least_ we can do is warn folks if they use something that
> we recently ripped out.  But the right thing is probably to keep the old
> one around for at least a while. <sigh>

True. I can leave the functionality but print a message basically saying "Don't
use this use the new one".

Thanks,
Dan