Windows Server 2012 R2 HyperV Migration Query

Hi All,

I have 100 VMs of Windows XP SP3 & Windows Server 2003, spread on Windows Server 2008 SP1 HyperV and Windows Server 2008 R2 HyperV host Servers (Standalone). I need to migrate these all VMs from these host servers to Windows Server 2012 R2 HyperV Cluster? I have SCVMM 2012 SP1 installed in my environment.

How can I achieve this?

From TechNet I could not find the possible way to address this migration.

Thanks & Regards, Kedar