Re: [Qemu-devel] TPM does not seem to work under QEMU with TPM patches

[Jordi Cucurull Juan]

Hi Kent,

I have solved the issue. The problem was that in CentOS the tpm_dis 
driver is integrated into the kernel and it was not loaded by default. I 
have added the following keywords to the kernel load line in the bootloader:

tpm_tis.force=1

Now the /dev/tpm0 device appears in the virtual machine and the TSS 
library loads correctly.

Thanks!
Jordi.


On 08/20/2012 10:14 PM, Kent Yoder wrote:
> Hi Jordi,
>
> On Mon, Aug 20, 2012 at 06:12:44PM -0400, Jordi Cucurull Juan wrote:
> > Dear all,
> >
> > I am testing the TPM patches of Stefan Berger to provide TPM support
> > to QEMU. Nevertheless I have not managed to run them successfully.
> > During the compilation of QEMU with his patches (V18 for revision
> > 563987d) I have not had any issue. But, I have a virtual machine
> > based on CentOS 6.2 and the TPM does not seem to be present. I run
> > the machine with the following command line (as a root user):
> >
> > # /usr/local/bin/qemu-system-x86_64 -hda qemu-disk-centos.img -m
> > 1024 -boot d -enable-kvm -usbdevice tablet -k es -tpmdev
> > passthrough,id=tpm0,path=/dev/tpm0 -device tpm-tis,tpmdev=tpm0
> >
> > My real machine has an Infineon TPM v1.2. When I try to load the TSS
> > library (Trousers) inside the client machine (the CentOS 6.2) it
> > throws the following error:
> >
> > insmod: error inserting 
> > '/lib/modules/2.6.32-279.5.1.el6.x86_64/kernel/drivers/char/tpm/tpm_atmel.ko':
> > -1 no such device
>    This should be fine - the tpm_tis driver should be driving the vtpm.
>
> > Apart from this, QEMU does not throw any error. Should I enable
> > something else to have access to the TPM? In addition, I do not see
> > any /dev/vtpm0 device in my real machine.
>    As I understand them, the qemu patches allow direct writing from the
> guest to the host's /dev/tpm0, so you wouldn't see a new device node.
>
> Kent
>
> > Best regards,
> > Jordi.
> >
> >
> > --
> > Jordi Cucurull Juan
> > Researcher
> > Scytl Secure Electronic Voting
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