2 Matching Annotations
  1. Aug 2022
    1. IBPB command event, or (on processors which support enhanced IBRS) either a VM exit with IBRS set to 1 or setting IBRS to 1 after a VM exit.

      So either a barrier via IBPB or IBRS=any?

      after case: the IBRS, presumably walks and cleans up context specific state? already set: checks for it on control change?

    2. IA32_SPEC_CTRL.IBRS is set either at or after a VM exit.

      What if the guest resets it? Where do we handle that?