HYPER-V(4) Kernel Interfaces Manual HYPER-V(4) NAME hv_kvp -- Hyper-V Key Value Pair Driver SYNOPSIS To compile this driver into the kernel, place the following lines in the system kernel configuration file: device hyperv DESCRIPTION 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 ad- dresses from a FreeBSD guest. The set functionality is particularly useful when the FreeBSD guest is as- signed a static IP address and is failed over from one Hyper-V host to an- other. After failover, Hyper-V uses the set IP functionality to automati- cally 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. SEE ALSO hv_ata_pci_disengage(4), hv_netvsc(4), hv_storvsc(4), hv_utils(4), hv_vm- bus(4), hv_kvp_daemon(8) HISTORY Support for hv_kvp first appeared in FreeBSD 10.0. The driver was devel- oped through a joint effort between Citrix Incorporated, Microsoft Corpora- tion and Network Appliance Incorporated. AUTHORS FreeBSD support for hv_kvp was first added by Microsoft BSD Integration Services Team <bsdic@microsoft.com>. FreeBSD 15.1 September 10, 2013 HYPER-V(4)
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