hv_utils(4) Hyper-V Utilities Driver


To compile this driver into the kernel, place the following lines in the system kernel configuration file:
device hyperv


The driver provides time keeping, shutdown and heartbeat functionality for Fx guest partitions running on Hyper-V. Hyper-V is a hypervisor-based virtualization technology from Microsoft. The driver is one of the core drivers required to be present in guest partitions running on Hyper-V. This driver provides the following functionalities to guest partitions:

(a) Time Keeping: The clock inside the guest partition will remain accurate by synchronizing to the clock on the virtualization server via Timesync service, and with the help of the pluggable time source device.

(b) Integrated shutdown: Guest partitions running Fx can be shut down from Hyper-V Manager console by using the Qq Shut down command.

(c) Heartbeat: This feature allows the virtualization server to detect whether the guest partition is running and responsive.


Support for first appeared in Fx 10.0 . The driver was developed through a joint effort between Citrix Incorporated, Microsoft Corporation, and Network Appliance Incorporated.


An -nosplit Fx support for was first added by An Microsoft BSD Integration Services Team Aq [email protected] .