Below you can find a error message :
virsh -c qemu:///system migrate --live kayobe3 qemu+ssh://r2virt1/system --copy-storage-all --verbose --persistent --undefinesource
error: internal error: qemu unexpectedly closed the monitor: 2019-11-07T12:39:10.856943Z qemu-system-x86_64: can't apply global SandyBridge-x86_64-cpu.osxsave=on: Property '.osxsave' not found