07-28-2014
KVM guests unique ID
Hi,
I wanted to know if there was a way to get a unique UUID for KVM guest from the guest OS which isn't easily modifiable. I have a software that I would like to run inside a KVM guest and want to do some license protection on it using a unique UUID. Does KVM allow multiple VMs on the same machine with same UUID. I mean if someone edits the configuration file of the VM manually from the host, would it still bring up the VM if the uuid was duplicated ? Also how can I get the uuid of a guest VM from the guest ?
Also if someone could throw some light on guest host communication channel. Is there an equivalent of Xenstore or guest property store in KVM ? Some mechanism to share small messages between the guest and the host.
Thanks
Shivani
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LEARN ABOUT FREEBSD
hv_kvp_daemon
HV_KVP_DAEMON(8) BSD System Manager's Manual HV_KVP_DAEMON(8)
NAME
hv_kvp_daemon -- Hyper-V Key Value Pair Daemon
SYNOPSIS
hv_kvp_daemon [-dn]
DESCRIPTION
The hv_kvp_daemon daemon 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 hv_kvp_daemon accepts Key Value pair management requests from the hv_utils(4) driver and performs the actual metadata management on the
file-system.
The same daemon and driver combination is 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.
The options are as follows:
-d Run as regular process instead of a daemon for debugging purpose.
-n Generate debugging output.
SEE ALSO
hv_vmbus(4), hv_utils(4), hv_netvsc(4), hv_storvsc(4), hv_ata_pci_disengage(4), hv_kvp(4)
HISTORY
Support for Hyper-V in the form of ports was first released in September 2013. The daemon was developed through a joint effort between Cit-
rix Inc., Microsoft Corp. and Network Appliance Inc..
AUTHORS
FreeBSD support for hv_kvp_daemon was first added by Microsoft BSD Integration Services Team <bsdic@microsoft.com>.
BSD
October 27, 2014 BSD