> Hello, > > On Wed, Jan 10, 2018 at 02:46:22PM +0100, Thomas Gleixner wrote: > > So here is the simple list of questions all to be answered with YES or > > NO. I don't want to see any of the 'but, though ...'. We all know by now > > that it's CPU dependent and slow and whatever and that IBRS_ATT will be in > > future CPUs. So get your act together and tell a clear YES or NO. > > Other comments/code from Tim Chen, and Dave Hansen and most important > the ibrs_enabled 2 description and implementation on lkml, makes me > still wonder if even Arjan may have misunderstood some detail about > IBRS semantics too.
I spent the better part of the last 6 months in dungeons with CPU designers trying to to figure out what we could and could not do. I'm pretty darn sure I know the details.
