[Xen-users] Unable to communicate with TPM on domU

[Nicolas Muñoz <nicolas.munoz.zz@xxxxxxxxx>]

Hi,

I am currently running a Debian lenny on top of a Ubuntu 9.04 dom0. (Xen version is 3.4)
Now I want to test some tpm functions in the domU, but I am having troubles reaching the TPM. To do so, I am following the tutorial here : 

https://www.grounation.org/index.php?post/2008/07/04/8-how-to-use-a-tpm-with-linux

I have already used this tutorial on a non-virtualised machine, and even on my dom0, and I managed to communicate with the TPM without any problem. So here is what I do, and what goes wrong : 


- apt-get install tpm-tools trousers
- modprobe tpm_bios
- modprobe tpm

So far, no problem. Here, if I follow exactly the tutorial and type 

- modprobe tpm_tis force=1 interrupts=0

I get the following error message : 

FATAL: Error inserting tpm_tis (/lib/modules/2.6.18.8-xen/kernel/drivers/char/tpm/tpm_tis.ko): Input/output error

When I look at dmesg, the displayed message is not the one expected :

pnp: the driver 'tpm_tis' has been registered

If I just run

- modprobe tpm_tis

I do not get any error message, but when I run dmesg, I get the same disappointing message (According to the tutorial, the message should be something like  

 [xxx.yyy] tpm_tis tpm_tis: 1.2 TPM (device-id 0x4A10, rev-id 78)

 which is what I get when I follow the tutorial anywhere but on my domU.

Anyway, after having done this, if I try to communicate with the TPM, I get the following error message :

lenny-guest:/home/nicolas# tpm_version
Tspi_Context_Connect failed: 0x00003011 - layer=tsp, code=0011 (17), Communication failure

which seems to confirm that the modules are not loaded...

Yes, I checked if tcsd was started, first with

/etc/init.d/trousers status
tcsd is not running

Then I ran

/usr/sbin/tcsd start

which does not return any error message

But /etc/init.d/trousers status keeps saying tcsd is not started.

Indeed, I wanted to disassemble the ACPI table to see if something was wrong, but it seems that there is no 'acpi' folder in /proc. But actually, as it works on the dom0, there should be no problem, because it proves that my TPM is supported by tpm_tis...


I think I detailed all I know about it, do you have any idea..?
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