This stencils can use for the Hyper-v diagram drawing with visio 2010/2007.This includes all the components like vm,hyper-v hosts,scvmm and more.I found this stencil from visiocafe.com.To find more visio components you can use the belo link

http://office.microsoft.com/en-us/visio-help/find-more-shapes-and-stencils-HA010199678.aspx