     </channel>
     <input type="mouse" bus="ps2"/>
     <tpm model="tpm-tis">
-      <backend type="passthrough">
-        <device path="/dev/tzz"/>
-      </backend>
+      <backend type="emulator" version="2.0"/>
     </tpm>
     <graphics type="vnc" port="-1" autoport="yes">
       <listen type="address"/>

Domain 'test-for-virtxml' defined successfully.
Changes will take effect after the domain is fully powered off.