I'm running into live migration failures going from newer kvm to older kvm where guest asks for KVM_ASYNC_PF_DELIVERY_AS_PF_VMEXIT. I wonder if a new kvm param to disable this from cpuid could be a viable option or would it make sense to expand the current kvm_asyncpf flag to disable the feature in qemu? Or other ideas. If there is a pointer to any work on this that would be great. - Mario
