E.g.
virt-install \
... \
--tpm model=tpm-tis,backend.type=emulator,backend.version=2.0,backend.debug=3
It results in the following domain xml:
<tpm model="tpm-tis">
<backend type="emulator" version="2.0" debug="3"/>
</tpm>
Signed-off-by: Lin Ma <lma@suse.de>