kvm_s390_pv_set_cpu_state
rc = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR_LOAD);
r = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR);
r = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_STP);
int kvm_s390_pv_set_cpu_state(struct kvm_vcpu *vcpu, u8 state);