stefanberger/swtpm

Can't boot qemu-system-riscv64 with swtpm

czz19981215 opened this issue · 2 comments

czz19981215 commented

Dear Sir:

I would like to mount the tpm device to my riscv64 qemu virtual machine.
The command are:
swtpm socket --tpmstate dir=/tmp/mytpm1 --tpm2 \ --ctrl type=unixio,path=/tmp/mytpm1/swtpm-sock \ --log level=20 -d

qemu-system-riscv64 -nographic -machine virt -m 4G -bios /usr/lib/riscv64-linux-gnu/opensbi/generic/fw_jump.elf -kernel /usr/lib/u-boot/qemu-riscv64_smode/uboot.elf -object rng-random,filename=/dev/urandom,id=rng0 -device virtio-rng-device,rng=rng0 -append "console=ttyS0 rw root=/dev/vda1" -device virtio-blk-device,drive=hd0 -drive file=rootfs.img,format=raw,id=hd0 -device virtio-net-device,netdev=usernet -netdev user,id=usernet,hostfwd=tcp::22222-:22 \ -chardev socket,id=chrtpm,path=/tmp/mytpm1/swtpm-sock -tpmdev emulator,id=tpm0,chardev=chrtpm -device tpm-tis,tpmdev=tpm0

And the response is:
qemu-system-riscv64: -tpmdev emulator,id=tpm0,chardev=chrtpm: Parameter 'type' expects a TPM backend type No TPM backend types are available
For for some version, the response is:
Failed to connect to '/tmp/mytpm1/swtpm-sock' : Connection refused

I've tested the qemu-system-x86 which can boot successfully but riscv64.

Desktop

  • OS: Ubuntu 20.04 in Vmware Workstation
  • Linux Version 5.13.0-37-generic

Versions of relevant components

  • swtpm: 0.7.0
  • QEMU: version 6.2.50 (v6.1.0-rc1-3124-g8d29feca83)
  • PS: I've tested various version of swtpm and qemu but the problem still.

Appreciate for your noticing and considering.

stefanberger commented

The problem is that there's no TPM support for riscv64 in qemu:

$ qemu-system-riscv64 -tpmdev help
No TPM backend types are available
$ qemu-system-x86_64 -tpmdev help
Supported TPM types (choose only one):
 passthrough   Passthrough TPM backend driver
    emulator   TPM emulator backend driver

To get this right it would likely require figuring out which TPM device (TIS or CRB) is suitable for RISC-V and on what bus. Then likely TPM ACPI tables need to be created on QEMU, followed by extensions to firmware (EDK2?) and then possibly Linux. I am not familiar with this architecture to know whether for example Linux TPM drivers are already working as-is and it's just a matter of enabling the hardware emulation in QEMU.

czz19981215 commented

Dear Sir,

Thanks for your replying.

The difficulty of solving this problem is beyond my ability, and I am considering opening an issue to QEMU. I'll close this issue, thanks again.