Re: vTPM setup problem on the emulator

[Matthew Fioravante <matthew.fioravante@jhuapl.edu>]

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On 01/09/2013 03:58 AM, gavin wrote:
> Hi,
>
> I tried to install the vTPM in Xen-4.1.0 + Dom0 kernel 2.6.18.8 + DomU 
> kernel 2.6.18.8. The device is TPM emulator.
> However, I encountered several problems.
>
> 1. In DomU, I run "modprobe tpm_xenu" successfully. But it doesn't 
> creates the /dev/tpm0 device as our had expected. So, the trousers 
> cannot be started. An old thread in Xen mail-list can do 
> this,(http://old-list-archives.xen.org/xense-devel/2006-12/msg00002.html) 
> but it helps little to me.
> Is there any problem with my vTPM front driver? The tpm related 
> modules and other info in DomU is list here.
> *[root@gavin-pv ~]# lsmod | grep tpm*
> tpm_xenu               15752  0 [permanent]
> tpm                        17952  1 tpm_xenu
> tpm_bios               10112  1 tpm
> *[root@gavin-pv ~]# tcsd -f*
> TCSD TDDL ERROR: Could not find a device to open!
Any relevant output in dmesg? Also does your domu config file have a 
vtpm device specified?
> 2. In Dom0, I run "modprobe tpmd_dev" and "modprobe tpmbk" also 
> successfully and I can get the devices /dev/tpm, /dev/tpm0, and 
> /dev/vtpm. However, I cannot start the tpm emulator (# ./tpmd -f clear 
> pvm 1) and vtpm manager (# vtpm_managerd). The related info and output 
> error from Dom0 is also list here.
So you want to use the TPM emulator on dom0 instead of a physical TPM?

I see you listed /dev/tpm and /dev/tpm0. I believe the old manager is 
hard coded to use the second one. Is tpmd creating both?


> *[root@localhost tpmd]# lsmod | grep tpm*
> tpmd_dev               10416  0
> tpmbk                     19516  0 [permanent]
> *[root@localhost tpmd]# ./tpmd -f clear pvm 1*
> VTPMD[0]: tpmd.c:766: Info: starting TPM Emulator daemon
> VTPMD[0]: tpmd.c:369: Info: parsing options
> VTPMD[1]: tpmd.c:478: Info: openening random device /dev/urandom
> VTPMD[1]: tpmd.c:621: Info: staring main loop
> Loading NVM.
> Error in read_from_file:301
> VTPMD[1]: ../tpm/tpm_data.c:83: Info: initializing TPM data to default 
> values
> VTPMD[1]: ../tpm/tpm_startup.c:30: Info: TPM_Init()
> VTPMD[1]: ../tpm/tpm_testing.c:242: Info: TPM_SelfTestFull()
> VTPMD[1]: ../tpm/tpm_testing.c:260: Info: Self-Test succeeded
> VTPMD[1]: ../tpm/tpm_startup.c:44: Info: TPM_Startup(1)
> VTPMD[1]: tpmd.c:661: Error: Failed to open devices to listen to guest.


>
> *[root@localhost vtpm]# vtpm_managerd*
> INFO[VTPM]: Starting VTPM.
> INFO[TCS]: Constructing new TCS:
> ERROR[TXDATA]: TPM open failedERROR in VTPM_Init_Manager at 
> vtpm_manager.c:205 code:
> TPM_IOERROR.
> ERROR[VTPM]: Closing vtpmd due to error during startup.
>
>
> Thanks in advance for your any reply.
>
> --
> Best Regards,
> Gavin
>
>


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