int kvm_s390_import_bp_data()

in kvm/guestdbg.c [203:280]

• 72 lines of code
• 15 McCabe index (conditional complexity)

int kvm_s390_import_bp_data(struct kvm_vcpu *vcpu,
			    struct kvm_guest_debug *dbg)
{
	int ret = 0, nr_wp = 0, nr_bp = 0, i;
	struct kvm_hw_breakpoint *bp_data = NULL;
	struct kvm_hw_wp_info_arch *wp_info = NULL;
	struct kvm_hw_bp_info_arch *bp_info = NULL;

	if (dbg->arch.nr_hw_bp <= 0 || !dbg->arch.hw_bp)
		return 0;
	else if (dbg->arch.nr_hw_bp > MAX_BP_COUNT)
		return -EINVAL;

	bp_data = memdup_user(dbg->arch.hw_bp,
			      sizeof(*bp_data) * dbg->arch.nr_hw_bp);
	if (IS_ERR(bp_data))
		return PTR_ERR(bp_data);

	for (i = 0; i < dbg->arch.nr_hw_bp; i++) {
		switch (bp_data[i].type) {
		case KVM_HW_WP_WRITE:
			nr_wp++;
			break;
		case KVM_HW_BP:
			nr_bp++;
			break;
		default:
			break;
		}
	}

	if (nr_wp > 0) {
		wp_info = kmalloc_array(nr_wp,
					sizeof(*wp_info),
					GFP_KERNEL_ACCOUNT);
		if (!wp_info) {
			ret = -ENOMEM;
			goto error;
		}
	}
	if (nr_bp > 0) {
		bp_info = kmalloc_array(nr_bp,
					sizeof(*bp_info),
					GFP_KERNEL_ACCOUNT);
		if (!bp_info) {
			ret = -ENOMEM;
			goto error;
		}
	}

	for (nr_wp = 0, nr_bp = 0, i = 0; i < dbg->arch.nr_hw_bp; i++) {
		switch (bp_data[i].type) {
		case KVM_HW_WP_WRITE:
			ret = __import_wp_info(vcpu, &bp_data[i],
					       &wp_info[nr_wp]);
			if (ret)
				goto error;
			nr_wp++;
			break;
		case KVM_HW_BP:
			bp_info[nr_bp].len = bp_data[i].len;
			bp_info[nr_bp].addr = bp_data[i].addr;
			nr_bp++;
			break;
		}
	}

	vcpu->arch.guestdbg.nr_hw_bp = nr_bp;
	vcpu->arch.guestdbg.hw_bp_info = bp_info;
	vcpu->arch.guestdbg.nr_hw_wp = nr_wp;
	vcpu->arch.guestdbg.hw_wp_info = wp_info;
	return 0;
error:
	kfree(bp_data);
	kfree(wp_info);
	kfree(bp_info);
	return ret;
}