On Thu, Sep 09, 2021 at 07:55:23PM +0800, Hou Wenlong wrote: > Per Intel's SDM, use vmcall instruction in non VMX operation for cpl3 > it should trigger a #UD. And in VMX root operation, it should Are you sure? IIRC, vmcall will always cause VM exit as long as CPU is in non-root mode(regardless the CPL). Also, could you please explain why skipping the vmcall would cause exception in the host? Thanks! B.R. Yu
