hv_ata_pci_disengage(4) [freebsd man page]

HYPER-V(4)						   BSD Kernel Interfaces Manual 						HYPER-V(4)

NAME

     hv_ata_pci_disengage -- Hyper-V ATA PCI Disengage driver

SYNOPSIS

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

	   device hyperv

DESCRIPTION

     The hv_ata_pci_disengage driver prevents the native FreeBSD ATA driver from loading in the presence of Hyper-V.  FreeBSD guests running on
     Hyper-V can take advantage of the Hyper-V Storage Virtual Consumer (hv_storvsc(4)) for using their IDE devices.  Since the ATA driver serves
     IDE devices as well, there is a chance that the ATA driver may interfere with the operations of hv_storvsc(4).  The hv_ata_pci_disengage
     driver avoids conflicts between the ATA driver and hv_storvsc(4) by disabling the ATA driver when the FreeBSD guest is booting.

     A side effect of disabling the ATA driver is that CDROM may become inoperational on FreeBSD guest partitions.  If CDROM access is a must then
     users may use "set hw.ata.disk_enable=1" at boot time to prevent the ATA driver from being disabled.

SEE ALSO

     hv_netvsc(4), hv_storvsc(4), hv_utils(4), hv_vmbus(4)

HISTORY

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

AUTHORS

     FreeBSD support for hv_ata_pci_disengage was first added by Microsoft BSD Integration Services Team <bsdic@microsoft.com>.

BSD
								September 10, 2013							       BSD

HYPER-V(4)						   BSD Kernel Interfaces Manual 						HYPER-V(4)

NAME

     hv_vmbus -- Hyper-V Virtual Machine Bus (VMBus) Driver

SYNOPSIS

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

	   device hyperv

DESCRIPTION

     The hv_vmbus provides a high performance communication interface between guest and root partitions in Hyper-V.  Hyper-V is a hypervisor-based
     virtualization technology from Microsoft.	Hyper-V supports isolation in terms of a partition.  A partition is a logical unit of isolation,
     supported by the hypervisor, in which operating systems execute.

     The Microsoft hypervisor must have at least one parent, or root, partition, running Windows Server operating system.  The virtualization
     stack runs in the parent partition and has direct access to the hardware devices.	The root partition then creates the child partitions which
     host the guest operating systems.

     Child partitions do not have direct access to other hardware resources and are presented a virtual view of the resources, as virtual devices
     (VDevs).  Requests to the virtual devices are redirected either via the VMBus or the hypervisor to the devices in the parent partition, which
     handles the requests.

     The VMBus is a logical inter-partition communication channel.  The parent partition hosts Virtualization Service Providers (VSPs) which com-
     municate over the VMBus to handle device access requests from child partitions.  Child partitions host Virtualization Service Consumers
     (VSCs) which redirect device requests to VSPs in the parent partition via the VMBus.  The Hyper-V VMBus driver defines and implements the
     interface that facilitate high performance bi-directional communication between the VSCs and VSPs.  All VSCs utilize the VMBus driver.

SEE ALSO

     hv_ata_pci_disengage(4), hv_netvsc(4), hv_storvsc(4), hv_utils(4)

HISTORY

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

AUTHORS

     FreeBSD support for hv_vmbus was first added by Microsoft BSD Integration Services Team <bsdic@microsoft.com>.

BSD
								September 10, 2013							       BSD