Re: [PATCH v2 06/21] KVM: x86: Treat #DBs from the emulator as fault-like (code and DR7.GD=1)

[Jim Mattson]

On Tue, Jun 14, 2022 at 1:47 PM Sean Christopherson <seanjc@xxxxxxxxxx> wrote:
>
> Add a dedicated "exception type" for #DBs, as #DBs can be fault-like or
> trap-like depending the sub-type of #DB, and effectively defer the
> decision of what to do with the #DB to the caller.
>
> For the emulator's two calls to exception_type(), treat the #DB as
> fault-like, as the emulator handles only code breakpoint and general
> detect #DBs, both of which are fault-like.

Does this mean that data and I/O breakpoint traps are just dropped?
Are there KVM errata for those misbehaviors?
What about single-stepping? Is that handled outwith the emulator?