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     hv_kvp — Hyper-V Key Value Pair Driver


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

           device hyperv


     The hv_kvp driver provides the ability to store, retrieve, modify and delete key value pairs
     for FreeBSD guest partitions running on Hyper-V.  Hyper-V allows administrators to store
     custom metadata in the form of key value pairs inside the FreeBSD guest partition.
     Administrators can use Windows Powershell scripts to add, read, modify and delete such key
     value pairs.

     The driver is bare bones and merely forwards requests to its counterpart user mode daemon,
     hv_kvp_daemon(8).  The daemon maintains pools of key value pairs and does the actual
     metadata management.

     The same driver and daemon combination are also used to set and get IP addresses from a
     FreeBSD guest.

     The set functionality is particularly useful when the FreeBSD guest is assigned a static IP
     address and is failed over from one Hyper-V host to another.  After failover, Hyper-V uses
     the set IP functionality to automatically update the FreeBSD guest's IP address to its
     original static value.

     On the other hand, the get IP functionality is used to update the guest IP address in the
     Hyper-V management console window.


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


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


     FreeBSD support for hv_kvp was first added by Microsoft BSD Integration Services Team