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Scenario 2: check default choose
1. Try to edit guest with:
<tpm>
<backend type='passthrough'>
</backend>
</tpm>
2. Check guest xml again, the default choose for model is tpm-tis, and device path is /dev/tpm0.
# virsh dumpxml rhel8.0-yqz |grep 'tpm model' -A6
<tpm model='tpm-tis'>
<backend type='passthrough'>
<device path='/dev/tpm0'/>
</backend>
</tpm>
Scenario 3: 'tpm-crb' model when backend is tpm 1.2
From libvirt.org, "model: ... Since 4.4.0, another available choice is the tpm-crb, which should only be used when the backend device is a TPM 2.0."
1. If start guest with 'tpm-crb' model when host tpm version is 1.2:
<tpm model='tpm-crb'>
<backend type='passthrough'>
<device path='/dev/tpm0'/>
</backend>
<alias name='tpm0'/>
</tpm>
# ps aux|grep qemu-kvm|grep tpm
... -tpmdev passthrough,id=tpm-tpm0,path=/dev/fdset/4,cancel-path=/dev/fdset/5 -add-fd set=4,fd=35 -add-fd set=5,fd=36 -device tpm-crb,tpmdev=tpm-tpm0,id=tpm0 ...
2.Guest can be started but tpm can not be used in guest os:
# tcsd -f
TCSD TDDL ERROR: Could not find a device to open!
# dmesg|grep tpm
[ 0.796479] tpm_tis MSFT0101:00: [Firmware Bug]: failed to get TPM2 ACPI table
[ 0.798589] tpm_tis: probe of MSFT0101:00 failed with error -22
[ 0.800107] tpm_crb MSFT0101:00: [Firmware Bug]: failed to get TPM2 ACPI table
[ 0.802184] tpm_crb: probe of MSFT0101:00 failed with error -22
Try to verify this bug on rhel8.0 with: libvirt-daemon-4.5.0-16.module+el8+2586+bf759444.x86_64 qemu-kvm-2.12.0-51.module+el8+2608+a17c4bfe.x86_64 Steps to verify: 1. Prepare a host with tpm chip and it's enabled in bios. # modprobe -r tpm_tis (we can see tpm_tis is builtin) modprobe: FATAL: Module tpm_tis is builtin. # systemctl start tcsd # yum install tpm_tools # tpm_version TPM 1.2 Version Info: Chip Version: 1.2.13.12 Spec Level: 2 Errata Revision: 3 TPM Vendor ID: STM Vendor Specific data: 50 TPM Version: 01010000 Manufacturer Info: 53544d20 # ls /dev/tpm0 /dev/tpm0 2. Start a guest without tpm, check in guest os: # tcsd -f TCSD TDDL ERROR: Could not find a device to open! 3.Edit guest with tpm passthrough, and try to start it: <tpm model='tpm-tis'> <backend type='passthrough'> <device path='/dev/tpm0'/> </backend> </tpm> # virsh start rhel8.0-yqz error: Failed to start domain rhel8.0-yqz error: Could not open TPM device /dev/tpm0: Device or resource busy 4. Stop host use for the tpm, then start guest again: # systemctl stop tcsd # tpm_version Tspi_Context_Connect failed: 0x00003011 - layer=tsp, code=0011 (17), Communication failure # virsh start rhel8.0-yqz Domain rhel8.0-yqz started # ps aux|grep qemu-kvm|grep tpm qemu 9452 29.8 6.8 3817080 537588 ? Sl 17:06 0:14 /usr/libexec/qemu-kvm -name guest=rhel8.0-yqz,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-2-rhel8.0-yqz/master-key.aes -machine pc-q35-rhel7.6.0,accel=kvm,usb=off,vmport=off,dump-guest-core=off -cpu Haswell-noTSX-IBRS,vme=on,ss=on,f16c=on,rdrand=on,hypervisor=on,arat=on,tsc_adjust=on,umip=on,stibp=on,ssbd=on,xsaveopt=on,pdpe1gb=on,abm=on -m 1024 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid 74e8cfa0-0beb-40ac-9662-17d5da05c52d -no-user-config -nodefaults -chardev socket,id=charmonitor,fd=30,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet -no-shutdown -global ICH9-LPC.disable_s3=1 -global ICH9-LPC.disable_s4=1 -boot strict=on -device pcie-root-port,port=0x10,chassis=1,id=pci.1,bus=pcie.0,multifunction=on,addr=0x2 -device pcie-root-port,port=0x11,chassis=2,id=pci.2,bus=pcie.0,addr=0x2.0x1 -device pcie-root-port,port=0x12,chassis=3,id=pci.3,bus=pcie.0,addr=0x2.0x2 -device pcie-root-port,port=0x13,chassis=4,id=pci.4,bus=pcie.0,addr=0x2.0x3 -device pcie-root-port,port=0x14,chassis=5,id=pci.5,bus=pcie.0,addr=0x2.0x4 -device pcie-root-port,port=0x15,chassis=6,id=pci.6,bus=pcie.0,addr=0x2.0x5 -device pcie-root-port,port=0x16,chassis=7,id=pci.7,bus=pcie.0,addr=0x2.0x6 -device qemu-xhci,p2=15,p3=15,id=usb,bus=pci.2,addr=0x0 -device virtio-serial-pci,id=virtio-serial0,bus=pci.3,addr=0x0 -drive file=/var/lib/libvirt/images/rhel8.0-yqz.qcow2,format=qcow2,if=none,id=drive-virtio-disk0 -device virtio-blk-pci,scsi=off,bus=pci.4,addr=0x0,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -netdev tap,fd=32,id=hostnet0,vhost=on,vhostfd=33 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:3a:3d:9f,bus=pci.1,addr=0x0 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -chardev socket,id=charchannel0,fd=34,server,nowait -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0 -chardev spicevmc,id=charchannel1,name=vdagent -device virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel1,id=channel1,name=com.redhat.spice.0 ********-tpmdev passthrough,id=tpm-tpm0,path=/dev/fdset/4,cancel-path=/dev/fdset/5 -add-fd set=4,fd=35 -add-fd set=5,fd=36 -device tpm-tis,tpmdev=tpm-tpm0,id=tpm0******** -device usb-tablet,id=input0,bus=usb.0,port=1 -spice port=5900,addr=127.0.0.1,disable-ticketing,seamless-migration=on -device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vram64_size_mb=0,vgamem_mb=16,max_outputs=1,bus=pcie.0,addr=0x1 -device ich9-intel-hda,id=sound0,bus=pcie.0,addr=0x1b -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -chardev spicevmc,id=charredir0,name=usbredir -device usb-redir,chardev=charredir0,id=redir0,bus=usb.0,port=2 -chardev spicevmc,id=charredir1,name=usbredir -device usb-redir,chardev=charredir1,id=redir1,bus=usb.0,port=3 -device virtio-balloon-pci,id=balloon0,bus=pci.5,addr=0x0 -object rng-random,id=objrng0,filename=/dev/urandom -device virtio-rng-pci,rng=objrng0,id=rng0,bus=pci.6,addr=0x0 -sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny -msg timestamp=on 5. Check tpm in guest os: # systemctl start tcsd # ls /dev/tpm0 /dev/tpm0 # yum install tpm-tools # tpm_version host6 localhost6.localdo�� TPM 1.2 Version Info: Chip Version: 1.2.13.12 Spec Level: 2 Errata Revision: 3 TPM Vendor ID: STM Vendor Specific data: 50 TPM Version: 01010000 Manufacturer Info: 53544d20 6. Try to use tpm on host again: # tcsd -f TCSD TDDL ERROR: Could not find a device to open!