Re: [PATCH v2 05/21] KVM: nVMX: Prioritize TSS T-flag #DBs over Monitor Trap Flag

[Jim Mattson]

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?

> 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. :-)