Document URL: 

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Virtualization_Deployment_and_Administration_Guide/sect-Manipulating_the_domain_xml-Devices.html#sect-Devices-TPM_devices

Section Number and Name: 

24.18.22 TPM devices

Describe the issue: 

In the XML example (Figure 26.82. TPM devices) there's a 'path' variable 
configuration which is precede by the word 'backend' while it should be 'device'

Suggestions for improvement: 

Change the XML example to be

~~~
  <devices>
    <tpm model='tpm-tis'>
      <backend type='passthrough'>
        <device path='/dev/tpm0'/>
      </backend>
    </tpm>
  </devices>
~~~

Or even remove that section till downstream QEMU version contains support to 
configure TPM devices since currently only QEMU upstream version contains 
support to configure TPM devices

Additional information: