kvm_share_hyp
int kvm_share_hyp(void *from, void *to);
ret = kvm_share_hyp(kvm, kvm + 1);
err = kvm_share_hyp(vcpu, vcpu + 1);
return kvm_share_hyp((void *)va, (void *)va + 1);
ret = kvm_share_hyp(buf, buf + reg_sz);