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20.19. Memory Balloon Device
			A virtual memory balloon device is added to all Xen and KVM/QEMU guest virtual machines. It will be seen as 
<memballoon> element. It will be automatically added when appropriate, so there is no need to explicitly add this element in the guest virtual machine XML unless a specific PCI slot needs to be assigned. Note that if the memballoon device needs to be explicitly disabled, model='none' may be used.
		
			The following example automatically added device with KVM
		
  ...
  <devices>
    <memballoon model='virtio'/>
  </devices>
  ...
  ...
  <devices>
    <memballoon model='virtio'/>
  </devices>
  ...
Figure 20.67. Memory balloon device
			Here is an example where the device is added manually with static PCI slot 2 requested
		
Figure 20.68. Memory balloon device added manually
			The required 
model attribute specifies what type of balloon device is provided. Valid values are specific to the virtualization platform are: 'virtio' which is the default setting with the KVM hypervisor or 'xen' which is the default setting with the Xen hypervisor.