Re: [Qemu-devel] [PATCH V4 01/10] Support for TPM command line options

[Stefan Berger]

On 05/17/2011 04:58 PM, Serge E. Hallyn wrote:
> Quoting Stefan Berger (address@hidden):
> > This patch adds support for TPM command line options.
> > The command line supported here (considering the libtpms based
> > backend) are
> >
> > ./qemu-... -tpm type=<type>,path=<path to blockstorage file>,
> Hm, I did
>
> kvm -tpm type=builtin,path=tpm.img -m 1G disk.img -vnc :1
>
> with disk.img being a newly installed VM.  I installed trousers
> and tpm-tools, tried loading the tpm, tpm_tis, tpm_infineon, and
> some other modules, /dev/tpm was never created, and
>
>    tpm_takeownership
>
> continued to give me:
>
> Tspi_Context_Connect failed: 0x00003011 - layer=tsp, code=0011 (17), 
> Communication failure
>
> Which kernel module should work with builtin?
The device model is a tpm-tis. So modprobe tpm_tis should create a 
/dev/tpm0. If nothing else helps enable the DEBUG_TIS in hw/tpm_tis and 
recompile.

Did you start it with SeaBIOS and the TPM-related patches applied to it? 
If not, you'll have to initialize the TPM that otherwise the BIOS would 
do. Otherwise the debugging output from the tpm-tis should begin very 
early once the BIOS sends commands to the TIS/TPM.

Regards,
  Stefan
> thanks,
> -serge