On Wed, Jul 06, 2022, Jim Mattson wrote: > On Tue, Jun 14, 2022 at 1:47 PM Sean Christopherson <seanjc@xxxxxxxxxx> wrote: > > > > Service TSS T-flag #DBs prior to pending MTFs, as such #DBs are higher > > priority than MTF. KVM itself doesn't emulate TSS #DBs, and any such > > Is there a KVM erratum for that? Nope, just this hilarious TODO: /* * TODO: What about debug traps on tss switch? * Are we supposed to inject them and update dr6? */ > > exceptions injected from L1 will be handled by hardware (or morphed to > > a fault-like exception if injection fails), but theoretically userspace > > could pend a TSS T-flag #DB in conjunction with a pending MTF. > > > > Note, there's no known use case this fixes, it's purely to be technically > > correct with respect to Intel's SDM. > > A test would be nice. :-) LOL, yeah, but ensuring userspace-injected TSS T-bit #DBs work isn't exactly on my list of top 100 things to look at.
