Hi,
To monitor Hyper-v and VMs, we should import Hyper-v management pack.
http://www.microsoft.com/en-us/download/details.aspx?id=36438
This management pack is for Hyper-v 2012, it provides the following functionality:
Management of critical Hyper-V services that affect virtual machines and host server functionality
Management of host server logical disks that affect virtual machine health
Full representation of virtualization in a single Hyper-V host server, including virtual networks, and virtual machines
Monitoring of virtual machine hardware components that affect availability
In addition, here is a smilar thread, please go through it:
http://social.technet.microsoft.com/Forums/systemcenter/en-US/fb362d76-4955-417a-8ba8-6f88655f6e81/scom-monitoring-virtual-machine-in-vmm
Regards,
Yan Li