linux-kernel - Re: [PATCH v2] x86/bugs: Break down mitigations configurations

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Message-ID: <0c908258-2b03-ebb3-bc7d-af5ea66479d4@intel.com>
Date:   Wed, 21 Jun 2023 15:58:10 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Breno Leitao <leitao@...ian.org>
Cc:     Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>, leit@...com,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] x86/bugs: Break down mitigations configurations

On 6/21/23 15:52, Breno Leitao wrote:
> On Wed, Jun 21, 2023 at 03:35:45PM -0700, Dave Hansen wrote:
>> On 6/21/23 12:41, Pawan Gupta wrote:
>>> Yes, a single series (or a patch) that adds config for each mitigation
>>> would be good.
>> Do people _really_ want per-mitigation compile-time controls?  That
>> seems like kinda a pain.
>>
>> I Boris suggested it, but it seems like a _bit_ of overkill to me.
>>
>> Would a compile-time option that just defaulted _everything_ to
>> mitigations=off behavior work instead?  That way we don't end up with a
>> billion new config options.
> This is exactly what my original patch proposed. It solves the problem with
> a few lines of changes.
> 
> https://lore.kernel.org/lkml/20230203120615.1121272-1-leitao@debian.org/

Hey Boris,

I like this simple thingy better.  If for no other reason than it
reduces the burden of what we have to do for every _new_ mitigation
going forward.

Do you like the direction this is going?  Maybe I'm missing something.