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# customVirtioConfiguration(_:didCreateDevice:)

A method the framework calls when it creates a custom Virtio device from a custom Virtio device configuration.

```
optional func customVirtioConfiguration(_ deviceConfiguration: VZCustomVirtioDeviceConfiguration, didCreateDevice device: VZCustomVirtioDevice)
```

## Parameters

`deviceConfiguration`

The configuration calling the delegate method.

`device`

The [`VZCustomVirtioDevice`](/documentation/Virtualization/VZCustomVirtioDevice) that the framework created.

## Discussion

The Virtualization framework creates a [`VZCustomVirtioDevice`](/documentation/Virtualization/VZCustomVirtioDevice) when you call [`init(configuration:)`](/documentation/Virtualization/VZVirtualMachine/init(configuration:))
and calls this method on the serial queue of the guest’s [`VZVirtualMachine`](/documentation/Virtualization/VZVirtualMachine) instance.

---

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