linux-kernel - Re: [PATCH 0/2] x86/bugs: Break down mitigations configurations

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Date:   Thu, 15 Jun 2023 10:21:55 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Breno Leitao <leitao@...ian.org>
Cc:     pawan.kumar.gupta@...ux.intel.com, jpoimboe@...nel.org,
        peterz@...radead.org, tglx@...utronix.de, bp@...en8.de,
        leit@...com, hpa@...or.com, x86@...nel.org, mingo@...hat.com,
        dave.hansen@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] x86/bugs: Break down mitigations configurations

Breno Leitao <leitao@...ian.org> writes:

> There is no way to compile a kernel today with some of the speculative
> mitigations disabled. Even if the kernel has
> CONFIG_SPECULATION_MITIGATIONS=n, some Intel mitigations, such as MDS, TAA,
> MMIO are still enabled and can only be disabled using a kernel parameter.
>
> This patchset creates a way to choose what to enable or disable, and,
> get the mitigations disable if CONFIG_SPECULATION_MITIGATIONS is not
> set, as the rest of other mitigations.
>
> Also, we want to print a warning message letting users know that these
> mitigations are disabled.
>
> This is a follow up to this discussion: https://lkml.org/lkml/2023/6/12/798
>

Isn't this all roughly equivalent to CONFIG_CMDLINE="mitigations=..." ?

-Andi