qemu-img resize disk.qcow2 +10G

qemu-img convert -f vdi -O qcow2 VIRTUALBOX.vdi KVM.qcow2

<disk type="file" device="disk">
  <driver name="qemu" type="raw"/>
  <source file="/dir/of/file/file.img"/>
  <target dev="sdc" bus="sata"/>
  <address type="drive" controller="0" bus="0" target="0" unit="2"/>
</disk>

<disk type="block" device="disk">
  <driver name="qemu" type="raw"/>
  <source dev="/dev/sdh"/>
  <target dev="vda" bus="virtio"/>
  <address type="pci" domain="0x0000" bus="0x04" slot="0x00" function="0x0"/>
</disk>

Запускаем VM

virsh attach-disk dmitriev-recover /dev/sdc vdc

Или одного раздела

virsh attach-disk dmitriev-recover /dev/sdc1 vdc