[libvirt] KVM migration with uri = NULL

What is the meaning of using virDomainMigrate () with NULL uri. Looking at the code of qemudDomainMigratePrepare2 ()/ qemu_driver.c, I understand that it tries to perform a migration to another VM on the same node . Is that correct ? Anyhow the code gets stuck while doing this with KVM-84 driver which does ok a live migration between 2 different nodes via QEMU monitor thanks Zvi Dubitzky Virtualization and System Architecture Email:dubi@il.ibm.com IBM Haifa Research Laboratory Phone: +972-4-8296182 Haifa, 31905, ISRAEL