On Wed, May 11, 2022, Arnabjyoti Kalita wrote: > Hello Jim and Sean, > > Thank you for your answers. > > If I re-inject the #BP back into the guest, does it automatically take > care of updating the RIP and continuing execution? Yes, the guest "automatically" handles the #BP. What the appropriate handling may be is up to the guest, i.e. skipping an instruction may or may not be the correct thing to do. Injecting the #BP after VM-Exit is simply emulating what would happen from the guest's perspective if KVM had never intercepted the #BP in the first place. Note, KVM doesn't have to initiate the injection, you can handle that from userspace via KVM_SET_VCPU_EVENTS. But if it's just as easy to hack KVM, that's totally fine too, so long as userspace doesn't double inject.
