1.\" 2.\" Copyright (c) 2012 Microsoft Corp. 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.Dd September 10, 2013 27.Dt HYPER-V 4 28.Os 29.Sh NAME 30.Nm hv_utils 31.Nd Hyper-V Utilities Driver 32.Sh SYNOPSIS 33To compile this driver into the kernel, place the following lines in 34the system kernel configuration file: 35.Bd -ragged -offset indent 36.Cd "device hyperv" 37.Ed 38.Sh DESCRIPTION 39The 40.Nm 41driver provides time keeping, shutdown and heartbeat 42functionality for 43.Fx 44guest partitions running on Hyper-V. 45Hyper-V is a hypervisor-based virtualization technology from Microsoft. 46The 47.Nm 48driver is one of the core drivers required to be present in guest 49partitions running on Hyper-V. 50This driver provides the following 51functionalities to guest partitions: 52.Pp 53(a) Time Keeping: The clock inside the guest partition will remain accurate by 54synchronizing to the clock on the virtualization server via Timesync service, 55and with the help of the pluggable time source device. 56.Pp 57(b) Integrated shutdown: Guest partitions running 58.Fx 59can be shut down from 60Hyper-V Manager console by using the 61.Qq Shut down 62command. 63.Pp 64(c) Heartbeat: This feature allows the virtualization server to detect whether 65the guest partition is running and responsive. 66.Sh SEE ALSO 67.Xr hv_ata_pci_disengage 4 , 68.Xr hv_netvsc 4 , 69.Xr hv_storvsc 4 , 70.Xr hv_vmbus 4 71.Sh HISTORY 72Support for 73.Nm 74first appeared in 75.Fx 10.0 . 76The driver was developed through a joint effort between Citrix Incorporated, 77Microsoft Corporation, and Network Appliance Incorporated. 78.Sh AUTHORS 79.An -nosplit 80.Fx 81support for 82.Nm 83was first added by 84.An Microsoft BSD Integration Services Team Aq Mt bsdic@microsoft.com . 85