On 23/07/2017 03:11, Jim Mattson wrote: >>> In the situation you describe, the #PF causes a synthesized VM-exit >>> from L2 to L1 directly, not indirectly. From the SDM: >>> >>> An exception causes a VM exit directly if the bit corresponding to >>> that exception is set in the exception bitmap. >>> >>> Hence, CR2 should not be set yet. >> >> Any idea how to synthesize exit qualification for page fault and debug >> exception? > > I think the ancillary data for #DB and #PF should be added to > kvm_queued_exception and plumbed through to where it's needed. Vector > number and error code are not sufficient to describe a #DB or #PF. It's more complicated than that, because you'd have to copy it out to userspace in KVM_GET_VCPU_EVENTS. But I agree it's the way to go: CR2 and DR6 should be only by inject_pending_event. Paolo
