From KVM

My lab setup is: 3 HP Servers each of 4 GB RAM. Server 1 and Server 2: installed with Virtualization using KVM on Redhat 6.5 System. On top of this I am using libvirtd for managing virtual machines. NFS server is installed on Server 3 for shared disk image. VM migration is working correctly. Now i need to do some changes in "migration.c" but did not find any source code of KVM-QEMU migration.

Where I can find the migration source code for KVM-QEMU. All are requested to help me for this issue.