2013/1/10 Matthew Fioravante
<matthew.fioravante@xxxxxxxxxx>
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?
When I run "insmod tpm_xenu.ko" at the first time in DomU, there is no special message in dmesg except for this "xen_tpm_fr: Initialising the vTPM driver."
Then, I reload the tpm_xenu module after removing it using "rmmod tpm_xenu.ko -f". I get the following message in dmesg.
...
xen_tpm_fr: Initialising the vTPM driver.
kobject_add failed for vtpm with -EEXIST, don't try to register things with the same
name in the same directory.
[<c01ea4ea>] kobject_add+0x11a/0x1a0
[<c01ea691>] kobject_register+0x21/0x50
[<c02400fd>] bus_add_driver+0x7d/0x140
[<c02856f9>] xenbus_register_driver_common+0x39/0x60
[<c0285740>] xenbus_register_frontend+0x20/0x40
[<e1227050>] tpmif_init+0x50/0x62 [tpm_xenu]
[<c0143b08>] sys_init_module+0x148/0x1b40
[<c01187fc>] do_page_fault+0x10c/0xc6f
[<c010845e>] do_syscall_trace+0x1ee/0x205
[<c01059bf>] syscall_call+0x7/0xb
In the DomUconfig file, I use vtpm = ['backend=0'].
But there is no vtpm device in Dom0 and DomU. See the following info.
Dom0:
[root@localhost fc8_new]# ls /sys/devices/xen-backend/
console-3-0 power uevent vbd-3-2049 vfb-3-0 vif-3-0 vkbd-3-0
DomU:
[root@gavin-pv tpm]# ls /sys/devices/xen
power uevent vbd-2049 vfb-0 vif-0 vkbd-0
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?
Yes, I try to use TPM emulator right now.
In fact, there is a physical TPM chip in my laptop. But I'm not sure how to make it work in fedora8. So, when the vTPM works well on emulator, I will try to abandon the emulator and use the 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?
Yes. When modprobe the tpmd_dev module, these two devices are created.
Thanks again.
[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.
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