long kvm_arch_vcpu_ioctl()

in kvm/arm.c [1242:1369]

• 104 lines of code
• 29 McCabe index (conditional complexity)

long kvm_arch_vcpu_ioctl(struct file *filp,
			 unsigned int ioctl, unsigned long arg)
{
	struct kvm_vcpu *vcpu = filp->private_data;
	void __user *argp = (void __user *)arg;
	struct kvm_device_attr attr;
	long r;

	switch (ioctl) {
	case KVM_ARM_VCPU_INIT: {
		struct kvm_vcpu_init init;

		r = -EFAULT;
		if (copy_from_user(&init, argp, sizeof(init)))
			break;

		r = kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
		break;
	}
	case KVM_SET_ONE_REG:
	case KVM_GET_ONE_REG: {
		struct kvm_one_reg reg;

		r = -ENOEXEC;
		if (unlikely(!kvm_vcpu_initialized(vcpu)))
			break;

		r = -EFAULT;
		if (copy_from_user(&reg, argp, sizeof(reg)))
			break;

		/*
		 * We could owe a reset due to PSCI. Handle the pending reset
		 * here to ensure userspace register accesses are ordered after
		 * the reset.
		 */
		if (kvm_check_request(KVM_REQ_VCPU_RESET, vcpu))
			kvm_reset_vcpu(vcpu);

		if (ioctl == KVM_SET_ONE_REG)
			r = kvm_arm_set_reg(vcpu, &reg);
		else
			r = kvm_arm_get_reg(vcpu, &reg);
		break;
	}
	case KVM_GET_REG_LIST: {
		struct kvm_reg_list __user *user_list = argp;
		struct kvm_reg_list reg_list;
		unsigned n;

		r = -ENOEXEC;
		if (unlikely(!kvm_vcpu_initialized(vcpu)))
			break;

		r = -EPERM;
		if (!kvm_arm_vcpu_is_finalized(vcpu))
			break;

		r = -EFAULT;
		if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
			break;
		n = reg_list.n;
		reg_list.n = kvm_arm_num_regs(vcpu);
		if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
			break;
		r = -E2BIG;
		if (n < reg_list.n)
			break;
		r = kvm_arm_copy_reg_indices(vcpu, user_list->reg);
		break;
	}
	case KVM_SET_DEVICE_ATTR: {
		r = -EFAULT;
		if (copy_from_user(&attr, argp, sizeof(attr)))
			break;
		r = kvm_arm_vcpu_set_attr(vcpu, &attr);
		break;
	}
	case KVM_GET_DEVICE_ATTR: {
		r = -EFAULT;
		if (copy_from_user(&attr, argp, sizeof(attr)))
			break;
		r = kvm_arm_vcpu_get_attr(vcpu, &attr);
		break;
	}
	case KVM_HAS_DEVICE_ATTR: {
		r = -EFAULT;
		if (copy_from_user(&attr, argp, sizeof(attr)))
			break;
		r = kvm_arm_vcpu_has_attr(vcpu, &attr);
		break;
	}
	case KVM_GET_VCPU_EVENTS: {
		struct kvm_vcpu_events events;

		if (kvm_arm_vcpu_get_events(vcpu, &events))
			return -EINVAL;

		if (copy_to_user(argp, &events, sizeof(events)))
			return -EFAULT;

		return 0;
	}
	case KVM_SET_VCPU_EVENTS: {
		struct kvm_vcpu_events events;

		if (copy_from_user(&events, argp, sizeof(events)))
			return -EFAULT;

		return kvm_arm_vcpu_set_events(vcpu, &events);
	}
	case KVM_ARM_VCPU_FINALIZE: {
		int what;

		if (!kvm_vcpu_initialized(vcpu))
			return -ENOEXEC;

		if (get_user(what, (const int __user *)argp))
			return -EFAULT;

		return kvm_arm_vcpu_finalize(vcpu, what);
	}
	default:
		r = -EINVAL;
	}

	return r;
}