weizhouapache commented on issue #11842:
URL: https://github.com/apache/cloudstack/issues/11842#issuecomment-3406398762
if vm runs on local storage, this might work
```
@@ -123,7 +123,7 @@
<alias name='input2'/>
</input>
<tpm model='tpm-tis'>
- <backend type='emulator' version='2.0'/>
+ <backend type='emulator' version='2.0' persistent_state='yes'/>
<alias name='tpm0'/>
</tpm>
```
however, if vm runs on shared storage, when vm is migrated, or started on
another host, it will not work, as the tpm file is saved on the original host,
for example `/var/lib/libvirt/swtpm/<vm uuid>/tpm2/tpm2-00.permall`
we could save the tpm file on the same primary pool as ROOT disk, for
example `<path of ROOT disk>.tpm2`, add then create a vm with tpm device (it is
supported since libivrt v10.10.0, so it does not work on RHEL 8/9 and ubuntu
22/24, it only works with RHEL 10)
```
<alias name='input2'/>
</input>
<tpm model='tpm-tis'>
- <backend type='emulator' version='2.0'/>
+ <backend type='emulator' version='2.0' persistent_state='yes'>
+ <source type='file' path='<path of ROOT disk>.tpm2'/>
+ </backend>
<alias name='tpm0'/>
</tpm>
```
then we need to handle the migration of the tpm2 file when migrate ROOT disk
to another storage pool.
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