1.\" $FreeBSD$ 2.\" 3.\" Copyright (c) 2012 Microsoft Corp. 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25.\" SUCH DAMAGE. 26.\" 27.Dd September 10, 2013 28.Dt HYPER-V 4 29.Os 30.Sh NAME 31.Nm hv_utils 32.Nd Hyper-V Utilities Driver 33.Sh SYNOPSIS 34To compile this driver into the kernel, place the following lines in 35the system kernel configuration file: 36.Bd -ragged -offset indent 37.Cd "device hyperv" 38.Ed 39.Sh DESCRIPTION 40The 41.Nm 42driver provides time keeping, shutdown and heartbeat 43functionality for 44.Fx 45guest partitions running on Hyper-V. 46Hyper-V is a hypervisor-based virtualization technology from Microsoft. 47The 48.Nm 49driver is one of the core drivers required to be present in guest 50partitions running on Hyper-V. 51This driver provides the following 52functionalities to guest partitions: 53.Pp 54(a) Time Keeping: The clock inside the guest partition will remain accurate by 55synchronizing to the clock on the virtualization server via Timesync service, 56and with the help of the pluggable time source device. 57.Pp 58(b) Integrated shutdown: Guest partitions running 59.Fx 60can be shut down from 61Hyper-V Manager console by using the 62.Qq Shut down 63command. 64.Pp 65(c) Heartbeat: This feature allows the virtualization server to detect whether 66the guest partition is running and responsive. 67.Sh SEE ALSO 68.Xr hv_ata_pci_disengage 4 , 69.Xr hv_netvsc 4 , 70.Xr hv_storvsc 4 , 71.Xr hv_vmbus 4 72.Sh HISTORY 73Support for 74.Nm 75first appeared in 76.Fx 10.0 . 77The driver was developed through a joint effort between Citrix Incorporated, 78Microsoft Corporation, and Network Appliance Incorporated. 79.Sh AUTHORS 80.An -nosplit 81.Fx 82support for 83.Nm 84was first added by 85.An Microsoft BSD Integration Services Team Aq Mt bsdic@microsoft.com . 86