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# negotiatedFeatures

The set of features that the driver and the device have successfully negotiated, or `nil` if no feature negotiation has taken place.

```
var negotiatedFeatures: VZNegotiatedVirtioFeatureSet? { get }
```

## Discussion

The value is only valid after the framework calls [`customVirtioDeviceDidAcceptDriverOk(_:)`](/documentation/Virtualization/VZCustomVirtioDeviceDelegate/customVirtioDeviceDidAcceptDriverOk(_:)). The framework calls this method when the guest driver sets `DRIVER_OK`.

---

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