Ah, I finally see what I'm being beaten over the head with- the kvm_prepare_memory_fault_exit() is a feature of KVM_CAP_MEMORY_FAULT_INFO, not EXIT_ON_MISSING. You're right of course Ok, so for this commit in the next version of the series I'm thinking the following description > KVM: arm64: Enable KVM_CAP_MEMORY_FAULT_INFO and annotate fault in the > stage-2 fault handler > > At the moment the only intended use case for KVM_CAP_MEMORY_FAULT_INFO > on arm64 is to annotate EFAULTs from the stage-2 fault handler, so > add that annotation now.