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

[Will Deacon]

On Fri, Apr 19, 2024 at 07:06:00AM -0700, Sean Christopherson wrote:
> 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

Ah, thanks. I'll go Ack that...

Will