# virsh qemu-monitor-command --hmp vmname 039;info kvm039; kvm support: enabled # virsh qemu-monitor-command --hmp vmname 039;info balloon039; balloon: actual=1024
# virsh qemu-monitor-command --hmp one-300 039;info balloon039; balloon: actual=2048 # virsh qemu-monitor-command --hmp one-300 039;balloon 1024039; # virsh qemu-monitor-command --hmp one-300 039;info balloon039; balloon: actual=1024