On 11/19/18 3:01 PM, Thomas Gleixner wrote: >> Yes, it wouldn't make sense for having just one of those if a task >> is worried about attack from user space. >> >> I'll document it. > What? IBPB makes tons of sense even without STIBP.
I'm lost. :) I don't think anyone is talking about using STIBP *everywhere* that IBPB is in-use. We're just guessing that, if anybody is paranoid enough to ask for IBPB, *and* they have SMT, they almost certainly want STIBP too.