Unified policy management for extensible virtual switches

1. A method comprising:

configuring, by one or more computing devices, a switch extension associated with a virtual switch with one or more settings;

in response to the configuring, persisting, by the one or more computing devices, the one or more settings in a configuration file on a root virtual machine; and

applying, by the one or more computing devices, the persisted one or more settings to a target switch extension of a target virtual switch.

2. The method of claim 1 , wherein the applying is performed as part of a live migration, back-up, or repair.

3. The method of claim 1 , further comprising receiving the one or more settings via a management interface.

4. The method of claim 3 , wherein the one or more settings are received as a Windows Management Instrumentation (WMI) object identifying a Managed Object Format (MOF) file providing a schema for the one or more settings.

5. The method of claim 1 , wherein the configuring comprises serializing the one or more settings into a binary representation.

6. The method of claim 5 , wherein the serializing comprises serializing the one or more settings based on an association of the one or more settings with a base class.

7. The method of claim 5 , wherein the configuring further comprises providing the binary representation and attributes derived from a schema to a virtual switch driver of the virtual switch via a device input/output control (IOCTL) message.

8. The method of claim 7 , wherein the virtual switch driver packages the binary representation and the attributes in a C structure, a Network Driver Interface Specification (NDIS) structure, or a data structure.

9. The method of claim 8 , wherein the configuring comprises providing the packaged binary representation and attributes to the switch extension via an object identifier (OID) request.

10. The method of claim 1 , wherein the persisting comprises updating a virtual machine configuration file responsive to a notification that the configuring was successful.

11. The method of claim 1 , wherein the switch extensions are filter modules of a virtual stack of the virtual switch utilized in filtering traffic to or from a virtual machine of a host device that implements the virtual switch.

12. The method of claim 1 , further comprising:

receiving a request for information associated with the switch extension;

providing a data structure associated with the request to the switch extension;

receiving the data structure in return from the switch extension, the data structure populated with the requested information; and

providing a response to the request that includes the requested information derived from the data structure.

13. The method of claim 12 , further comprising deserializing a binary representation included in the data structure and generating a WMI object based on the deserialized binary representation.

14. A system comprising:

one or more processors; and

a plurality of components of a virtual machine implemented in the system and operated by the one or more processors, the components including:

a management interface configured to receive a settings object, the management interface enabling specification of the settings object and identification of an schema associated with a switch extension of a virtual switch of the virtual machine;

a serialization component configured to generate a binary representation of the settings object;

a virtual switch driver of a virtual switch configured to package the binary representation and attributes derived from the schema into a C structure and provide the C structure to the switch extension to enable configuration of the switch extension with one or more settings included in the settings object, and

a configuration file configured to persist the one or more settings.

15. The system of claim 14 , wherein the virtual machine is a root virtual machine of a host device that includes at least the root virtual machine and a hypervisor to enable instantiation of additional virtual machines and communication with the additional virtual machines and/or the root virtual machine through the virtual switch.

16. One or more computer storage media comprising computer-executable instructions stored thereon and configured to program a computing device to perform operations including:

receiving, by a root virtual machine, a request for information associated with a switch extension of a virtual switch implemented on the computing device;

providing, by the root virtual machine, a data structure associated with the request to the switch extension;

receiving, by the root virtual machine, the data structure in return from the switch extension, the data structure populated with the requested information; and

providing, by the root virtual machine, a response to the request that includes the requested information derived from the data structure.

17. The one or more computer storage media of claim 16 , wherein the data structure is one of a C structure or an NDIS structure.

18. The one or more computer storage media of claim 16 , wherein the operations further include deserializing a binary representation included in the data structure and generating a WMI object based on the deserialized binary representation.

19. The one or more computer storage media of claim 18 , wherein the operations further include providing the WMI object to a WMI interface to enable the WMI interface to generate and provide the response.

20. The one or more computer storage media of claim 16 , wherein the requested information includes one or more of settings or performance metrics associated with the switch extension.