CPUSTAT_IBS
return kvm_s390_test_cpuflags(vcpu, CPUSTAT_IBS);
kvm_s390_set_cpuflags(vcpu, CPUSTAT_IBS);
kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IBS);
newflags |= cpuflags & CPUSTAT_IBS;