Re: [Patch v5 11/16] x86/speculation: Add Spectre v2 app to app protection modes

[Dave Hansen]

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.