Re: [PATCH v2 3/4] arch/x86: Optionally flush L1D on context switch

[Benjamin Herrenschmidt]

On Tue, 2020-04-07 at 11:26 -0700, Kees Cook wrote:
> > Add arch specific prctl()'s to opt-in to the L1D cache on context
> > switch
> > out, the existing mechanisms of tracking prev_mm via cpu_tlbstate
> > is
> > reused. cond_ibpb() is refactored and renamed into
> > cond_mitigation().
> 
> I still think this should be a generic prctl(). If there is a strong
> reason not to do this, can it be described in the commit log here?

Agreed.

Cheers,
Ben.