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SubjectRe: [PATCH v4 2/5] cpu/speculation: Fix CPU mitigation defaults for !x86
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On Fri, Apr 19, 2024, Sean Christopherson wrote:
> On Fri, Apr 19, 2024, Josh Poimboeuf wrote:
> > CPU speculative execution mitigations were inadvertently disabled on
> > non-x86 arches by the following commit:
> >
> > f337a6a21e2f ("x86/cpu: Actually turn off mitigations by default for SPECULATION_MITIGATIONS=n")
> >
> > Fix it by replacing CONFIG_SPECULATION_MITIGATIONS with a new generic
> > CONFIG_CPU_MITIGATIONS option and moving the x86-specific mitigations to
> > a separate menu which depends on CONFIG_CPU_MITIGATIONS.
>
> Ah drat, I didn't check my mailbox until after Cc'ing Linus my own version[*].
>
> I don't have a strong preference between the two, though I do think it's worth
> nothing that this will (obvioulsy) allow disabling mitigations at compile time
> on all architectures, which may or may not be desirable.
>
> [*] https://lore.kernel.org/all/20240420000556.2645001-2-seanjc@google.com

Josh, when you get a chance, can you weigh in on my menu-preserving approach?

I want to get this resolved asap so that we're not scrambing on Friday again :-)

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