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.Dd September 10, 2013 .Dt HYPER-V 4 .Os .Sh NAME .Nm hv_utils .Nd Hyper-V Utilities Driver .Sh SYNOPSIS To compile this driver into the kernel, place the following lines in the system kernel configuration file: d -ragged -offset indent .Cd "device hyperv" .Ed .Sh DESCRIPTION The .Nm 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 .Nm 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:
p (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.
p (b) Integrated shutdown: Guest partitions running .Fx can be shut down from Hyper-V Manager console by using the .Qq Shut down command.
p (c) Heartbeat: This feature allows the virtualization server to detect whether the guest partition is running and responsive. .Sh SEE ALSO .Xr hv_vmbus 4 , .Xr hv_netvsc 4 , .Xr hv_storvsc 4 , .Xr hv_ata_pci_disengage 4 .Sh HISTORY Support for .Nm first appeared in .Fx 10.0 . The driver was developed through a joint effort between Citrix Incorporated, Microsoft Corporation, and Network Appliance Incorporated. .Sh AUTHORS .An -nosplit .Fx support for .Nm was first added by .An Microsoft BSD Integration Services Team Aq bsdic@microsoft.com .