[PATCH 1/3] x86/cpu: Actually turn off mitigations by default for SPECULATION_MITIGATIONS=n

[Sean Christopherson]

On Fri, Apr 19, 2024, Will Deacon wrote:
> On Mon, Apr 15, 2024 at 07:31:23AM -0700, Sean Christopherson wrote:
> > On Mon, Apr 15, 2024, Geert Uytterhoeven wrote:
> > Oof.  I completely missed that "cpu_mitigations" wasn't x86-only.  I can't think
> > of better solution than an on-by-default generic Kconfig, though can't that it
> > more simply be:
> > 
> > diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
> > index 2b8fd6bb7da0..5930cb56ee29 100644
> > --- a/drivers/base/Kconfig
> > +++ b/drivers/base/Kconfig
> > @@ -191,6 +191,9 @@ config GENERIC_CPU_AUTOPROBE
> >  config GENERIC_CPU_VULNERABILITIES
> >         bool
> >  
> > +config SPECULATION_MITIGATIONS
> > +       def_bool !X86
> > +
> >  config SOC_BUS
> >         bool
> >         select GLOB
> 
> I can't see this in -next yet. Do you plan to post it as a proper patch
> to collect acks etc?

Sorry, I neglected to Cc everyone.

https://lore.kernel.org/all/20240417001507.2264512-2-seanjc@google.com