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according to https://qemu.readthedocs.io/en/latest/specs/tpm.html#the-qemu-tpm-emulator-device

"The TPM emulator device uses an external TPM emulator called ‘swtpm’ for sending TPM commands to and receiving responses from. The swtpm program must have been started before trying to access it through the TPM emulator with QEMU."

checkin if swtpm is running on openQA workers :

_openqa+ 52457  0.0  0.0   9904  3724 ?        Ss   11:01   0:00 swtpm socket --tpmstate dir=/tmp/mytpm18 --ctrl type=unixio,path=/tmp/mytpm18/swtpm-sock --log level=20 -d --tpm2
_openqa+ 52458 95.0  0.6 2580112 796960 ?      Sl   11:01   1:33 /usr/bin/qemu-system-aarch64 -device virtio-gpu-pci,edid=on,xres=1024,yres=768 -only-migratable -chardev ringbuf,id=serial0,logfile=serial0,logappend=on -serial chardev:serial0 -audiodev none,id=snd0 -device intel-hda -device hda-output,audiodev=snd0 -m 1024 -machine virt,usb=off,gic-version=3,its=off -cpu host -netdev user,id=qanet0 -device virtio-net,netdev=qanet0,mac=52:54:00:12:34:56 -object rng-random,filename=/dev/urandom,id=rng0 -device virtio-rng-pci,rng=rng0 -chardev socket,id=chrtpm,path=/tmp/mytpm18/swtpm-sock -tpmdev emulator,id=tpm0,chardev=chrtpm -device tpm-tis-device,tpmdev=tpm0 -boot menu=on,splash-time=5000 -device nec-usb-xhci -device usb-tablet -device usb-kbd -smp 2 -enable-kvm -no-shutdown -vnc :108,share=force-shared -device virtio-serial -chardev pipe,id=virtio_console,path=virtio_console,logfile=virtio_console.log,logappend=on -device virtconsole,chardev=virtio_console,name=org.openqa.console.virtio_console -chardev pipe,id=virtio_console_user,path=virtio_console_user,logfile=virtio_console_user.log,logappend=on -device virtconsole,chardev=virtio_console_user,name=org.openqa.console.virtio_console_user -chardev socket,path=qmp_socket,server=on,wait=off,id=qmp_socket,logfile=qmp_socket.log,logappend=on -qmp chardev:qmp_socket -S -device virtio-scsi-pci,id=scsi0 -blockdev driver=file,node-name=hd0-overlay0-file,filename=/var/lib/openqa/pool/18/raid/hd0-overlay0,cache.no-flush=on -blockdev driver=qcow2,node-name=hd0-overlay0,file=hd0-overlay0-file,cache.no-flush=on,discard=unmap -device virtio-blk-device,id=hd0-device,drive=hd0-overlay0,bootindex=0,serial=hd0 -blockdev driver=file,node-name=cd0-overlay0-file,filename=/var/lib/openqa/pool/18/raid/cd0-overlay0,cache.no-flush=on -blockdev driver=qcow2,node-name=cd0-overlay0,file=cd0-overlay0-file,cache.no-flush=on,discard=unmap -device scsi-cd,id=cd0-device,drive=cd0-overlay0,serial=cd0 -drive id=pflash-code-overlay0,if=pflash,file=/var/lib/openqa/pool/18/raid/pflash-code-overlay0,unit=0,readonly=on -drive id=pflash-vars-overlay0,if=pflash,file=/var/lib/openqa/pool/18/raid/pflash-vars-overlay0,unit=1

amanzini@openqaworker-arm-2:~> cd /tmp/mytpm18 
amanzini@openqaworker-arm-2:/tmp/mytpm18> ll
total 4
srwxrwx--- 1 _openqa-worker nogroup    0 Feb  8 11:01 swtpm-sock
-rw-r----- 1 _openqa-worker nogroup 1187 Feb  8 11:02 tpm2-00.permall

from SUT:

# dmesg | grep tpm 
reports
"A TPM error (256) occured attempting the self test"

# lsmod | grep tpm
tpm_tis        16384 0
tpm_tis_core   28672 1 tpm_tis

- on the bios setting there is no TPM device detected/configured