Source - http://www.microsoft.com/en-us/download/details.aspx?id=29991&WT.mc_id=rss_alldownloads_all
When installed in a supported Linux virtual machine running on Hyper-V, the Linux Integration Components provide. Driver support: Linux Integration Services supports the network controller and the IDE and SCSI storage controllers that were developed specifically for Hyper-V. Fastpath Boot Support for Hyper-V: Boot devices now take advantage of the block Virtualization Service Client (VSC) to provide enhanced performance. Timesync: The clock inside the virtual machine will remain synchronized with the clock on the virtualization server with the help of the pluggable time source device. Integrated Shutdown: Virtual machines running Linux can be shut down from either Hyper-V Manager or System Center Virtual Machine Manager by using the “Shut Down” command. Symmetric Multi-Processing (SMP) Support: Supported Linux distributions can use up to 4 virtual processors (VP) per virtual machine. Heartbeat: Allows the virtualization server to detect whether the virtual machine is running and responsive. KVP (Key Value Pair) Exchange: Information about the running Linux virtual machine can be obtained by using the Key Value Pair exchange functionality on the Windows Server 2008 virtualization server. Integrated Mouse Support: The cursor is no longer bound to the VMConnect window when used with the Linux Graphical User Interface.
Supported operating systems: Undefined, Windows Server 2008, Windows Server 2008 R2, Windows Server 2008 R2 SP1
Supported operating systems: Windows Server 2008, Windows Server 2008 R2, Windows Server 2008 R2 SP1 Windows Server 2008 with Hyper-V RTM Update (KB950050) applied Microsoft Hyper-V Server 2008 Windows Server 2008 R2 Hyper-V RTM Microsoft Hyper-V Server 2008 R2 RTM