94 lines
3.5 KiB
Groff
94 lines
3.5 KiB
Groff
.\" $FreeBSD$
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.\"
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.\" Copyright (c) 2012 Microsoft Corp.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd September 10, 2013
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.Dt HYPER-V 4
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.Os
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.Sh NAME
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.Nm hv_vmbus
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.Nd Hyper-V Virtual Machine Bus (VMBus) Driver
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.Sh SYNOPSIS
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To compile this driver into the kernel, place the following lines in
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the system kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device hyperv"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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provides a high performance communication interface between
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guest and root partitions in Hyper-V.
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Hyper-V is a hypervisor-based virtualization technology from Microsoft.
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Hyper-V supports isolation in terms of a partition.
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A partition is a
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logical unit of isolation, supported by the hypervisor, in which
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operating systems execute.
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.Pp
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The Microsoft hypervisor must have at least one parent, or root,
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partition, running Windows Server operating system.
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The virtualization stack runs in the parent partition and has
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direct access to the hardware devices.
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The root partition then creates the child partitions which host
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the guest operating systems.
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.Pp
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Child partitions do not have direct access to other hardware resources
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and are presented
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a virtual view of the resources, as virtual devices (VDevs).
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Requests to the virtual devices are
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redirected either via the VMBus or the hypervisor to the devices in
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the parent partition, which handles the requests.
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.Pp
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The VMBus is a logical inter-partition communication channel.
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The parent partition hosts Virtualization Service Providers (VSPs)
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which communicate over the VMBus to handle device access requests from
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child partitions.
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Child partitions host Virtualization Service
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Consumers (VSCs) which redirect device requests to VSPs in the parent
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partition via the VMBus.
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The Hyper-V VMBus driver defines and implements
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the interface that facilitate high performance bi-directional communication
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between the VSCs and VSPs.
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All VSCs utilize the VMBus driver.
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.Sh SEE ALSO
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.Xr hv_utils 4 ,
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.Xr hv_netvsc 4 ,
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.Xr hv_storvsc 4 ,
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.Xr hv_ata_pci_disengage 4
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.Sh HISTORY
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Support for
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.Nm
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first appeared in
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.Fx 10.0 .
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The driver was developed through a joint effort between Citrix Incorporated,
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Microsoft Corporation, and Network Appliance Incorporated.
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.Sh AUTHORS
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.An -nosplit
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.Fx
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support for
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.Nm
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was first added by
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.An Microsoft BSD Integration Services Team Aq Mt bsdic@microsoft.com .
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