$ grep -i "Send command" /var/log/libvirt/libvirtd.log
2015-09-29 18:47:43.571+0000: 22665: debug : qemuMonitorJSONCommandWithFd:290 : Send command '{"execute":"qmp_capabilities","id":"libvirt-1"}' for write with FD -1
2015-09-29 18:47:43.573+0000: 22665: debug : qemuMonitorJSONCommandWithFd:290 : Send command '{"execute":"query-chardev","id":"libvirt-2"}' for write with FD -1
2015-09-29 18:47:43.575+0000: 22665: debug : qemuMonitorJSONCommandWithFd:290 : Send command '{"execute":"qom-list","arguments":{"path":"/machine/unattached/device[0]"},"id":"libvirt-3"}' for write with FD -1
2015-09-29 18:47:43.579+0000: 22665: debug : qemuMonitorJSONCommandWithFd:290 : Send command '{"execute":"qom-get","arguments":{"path":"/machine/unattached/device[0]","property":"feature-words"},"id":"libvirt-4"}' for write with FD -1
2015-09-29 18:47:43.583+0000: 22665: debug : qemuMonitorJSONCommandWithFd:290 : Send command '{"execute":"query-cpus","id":"libvirt-5"}' for write with FD -1
2015-09-29 18:47:43.585+0000: 22665: debug : qemuMonitorJSONCommandWithFd:290 : Send command '{"execute":"query-iothreads","id":"libvirt-6"}' for write with FD -1
2015-09-29 18:47:43.588+0000: 22665: debug : qemuMonitorJSONCommandWithFd:290 : Send command '{"execute":"qom-list","arguments":{"path":"/machine/peripheral"},"id":"libvirt-7"}' for write with FD -1
2015-09-29 18:47:43.592+0000: 22665: debug : qemuMonitorJSONCommandWithFd:290 : Send command '{"execute":"balloon","arguments":{"value":1073741824},"id":"libvirt-8"}' for write with FD -1
2015-09-29 18:47:43.595+0000: 22665: debug : qemuMonitorJSONCommandWithFd:290 : Send command '{"execute":"query-migrate-capabilities","id":"libvirt-9"}' for write with FD -1
2015-09-29 18:47:43.597+0000: 22665: debug : qemuMonitorJSONCommandWithFd:290 : Send command '{"execute":"migrate-set-capabilities","arguments":{"capabilities":[{"capability":"xbzrle","state":false}]},"id":"libvirt-10"}' for write with FD -1
2015-09-29 18:47:43.600+0000: 22665: debug : qemuMonitorJSONCommandWithFd:290 : Send command '{"execute":"query-migrate-capabilities","id":"libvirt-11"}' for write with FD -1
2015-09-29 18:47:43.601+0000: 22665: debug : qemuMonitorJSONCommandWithFd:290 : Send command '{"execute":"migrate-set-capabilities","arguments":{"capabilities":[{"capability":"rdma-pin-all","state":false}]},"id":"libvirt-12"}' for write with FD -1
2015-09-29 18:47:43.603+0000: 22665: debug : qemuMonitorJSONCommandWithFd:290 : Send command '{"execute":"nbd-server-start","arguments":{"addr":{"type":"inet","data":{"host":"::","port":"49153"}}},"id":"libvirt-13"}' for write with FD -1
2015-09-29 18:47:43.605+0000: 22665: debug : qemuMonitorJSONCommandWithFd:290 : Send command '{"execute":"nbd-server-add","arguments":{"device":"drive-virtio-disk0","writable":true},"id":"libvirt-14"}' for write with FD -1
2015-09-29 18:47:43.618+0000: 22665: debug : qemuMonitorJSONCommandWithFd:290 : Send command '{"execute":"query-block","id":"libvirt-15"}' for write with FD -1
2015-09-29 18:47:45.049+0000: 22661: debug : qemuMonitorJSONCommandWithFd:290 : Send command '{"execute":"nbd-server-stop","id":"libvirt-16"}' for write with FD -1
2015-09-29 18:47:45.103+0000: 22661: debug : qemuMonitorJSONCommandWithFd:290 : Send command '{"execute":"cont","id":"libvirt-17"}' for write with FD -1