On Thu, Jun 04, 2020 at 03:29:26PM +0200, Paolo Bonzini wrote: > On 04/06/20 15:25, Peter Zijlstra wrote: > > It being enabled through IA32_DEBUGCTL instead of through DR7 means that > > the current code doesn't disable it and this then means we can have > > nested #DB again. > > /me bangs head on door > > > Who sodding throught this was a good idea ?! What happened to #AC that > > SLD currently uses? > > It was per-core and (presumably) considered unfixable?
Yeah, but I don't see how changing the exception vector helps with that. #DB is an IST, and it must be, because of that lovely MOV SS thing. #AC has none of that, _please_ use #AC.
