linux-kernel - Re: [PATCH v4] x86/bugs: Add a separate config for each mitigation

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Message-ID: <20231011190317.GDZSbxdd5TuCIp5+JN@fat_crate.local>
Date:   Wed, 11 Oct 2023 21:03:17 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Josh Poimboeuf <jpoimboe@...nel.org>
Cc:     Breno Leitao <leitao@...ian.org>, tglx@...utronix.de,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>, leit@...a.com,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] x86/bugs: Add a separate config for each mitigation

On Tue, Oct 10, 2023 at 09:42:52PM -0700, Josh Poimboeuf wrote:
>   MITIGATION_PAGE_TABLE_ISOLATION
>   MITIGATION_RETPOLINE
>   MITIGATION_UNRET_ENTRY
>   MITIGATION_CALL_DEPTH_TRACKING
>   MITIGATION_IBPB_ENTRY
>   MITIGATION_IBRS_ENTRY
>   MITIGATION_SRSO
>   MITIGATION_SLS

The train has already left the station on those. The other mitigations
don't have "MITIGAT*" at all in front of the name. I.e.:

config RETHUNK
config CALL_DEPTH_TRACKING
...

and prepending them all with MITIGATION_ is going to cause too much
senseless churn for a reason which I don't think is worth the effort.

So let's stick with the current naming scheme and do

config MDS
config TAA
...

and so on.

Thx.

-- 
Regards/Gruss,
    Boris.

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