Re: [PATCH v4 2/5] cpu/speculation: Fix CPU mitigation defaults for !x86

[Sean Christopherson <seanjc@google.com>]

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 :-)