do_keyop
k = do_keyop(vcpu, KVM_S390_KEYOP_RRBE, i, 0xff);
tmp[i] = do_keyop(vcpu, KVM_S390_KEYOP_ISKE, i, 0xff);
old[i] = do_keyop(vcpu, KVM_S390_KEYOP_SSKE, i, expected[i] | 1);