int kvm_handle_sie_intercept()

in kvm/intercept.c [541:608]

• 59 lines of code
• 22 McCabe index (conditional complexity)

int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
{
	int rc, per_rc = 0;

	if (kvm_is_ucontrol(vcpu->kvm))
		return -EOPNOTSUPP;

	switch (vcpu->arch.sie_block->icptcode) {
	case ICPT_EXTREQ:
		vcpu->stat.exit_external_request++;
		return 0;
	case ICPT_IOREQ:
		vcpu->stat.exit_io_request++;
		return 0;
	case ICPT_INST:
		rc = handle_instruction(vcpu);
		break;
	case ICPT_PROGI:
		return handle_prog(vcpu);
	case ICPT_EXTINT:
		return handle_external_interrupt(vcpu);
	case ICPT_WAIT:
		return kvm_s390_handle_wait(vcpu);
	case ICPT_VALIDITY:
		return handle_validity(vcpu);
	case ICPT_STOP:
		return handle_stop(vcpu);
	case ICPT_OPEREXC:
		rc = handle_operexc(vcpu);
		break;
	case ICPT_PARTEXEC:
		rc = handle_partial_execution(vcpu);
		break;
	case ICPT_KSS:
		rc = kvm_s390_skey_check_enable(vcpu);
		break;
	case ICPT_MCHKREQ:
	case ICPT_INT_ENABLE:
		/*
		 * PSW bit 13 or a CR (0, 6, 14) changed and we might
		 * now be able to deliver interrupts. The pre-run code
		 * will take care of this.
		 */
		rc = 0;
		break;
	case ICPT_PV_INSTR:
		rc = handle_instruction(vcpu);
		break;
	case ICPT_PV_NOTIFY:
		rc = handle_pv_notification(vcpu);
		break;
	case ICPT_PV_PREF:
		rc = 0;
		gmap_convert_to_secure(vcpu->arch.gmap,
				       kvm_s390_get_prefix(vcpu));
		gmap_convert_to_secure(vcpu->arch.gmap,
				       kvm_s390_get_prefix(vcpu) + PAGE_SIZE);
		break;
	default:
		return -EOPNOTSUPP;
	}

	/* process PER, also if the instrution is processed in user space */
	if (vcpu->arch.sie_block->icptstatus & 0x02 &&
	    (!rc || rc == -EOPNOTSUPP))
		per_rc = kvm_s390_handle_per_ifetch_icpt(vcpu);
	return per_rc ? per_rc : rc;
}