Description of problem:
Downstream qemu-kvm does not support the TPM configuration for pass-through devices.

Version-Release number of selected component (if applicable):
qemu-kvm-1.5.3-105.el7_2.3.x86_64

How reproducible:

Steps to Reproduce:
On RHEL 7.2

1. For KVM guest define a TPM passthrough device as per 
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Virtualization_Deployment_and_Administration_Guide/sect-Manipulating_the_domain_xml-Devices.html#sect-Devices-TPM_devices

2. Snip of gues XML definition
---
<tpm model='tpm-tis'>
<backend type='passthrough'>
<device path='/dev/tpm0'/>
</backend> </tpm>
---

3. Start the guest.

Actual results:
Guest fails to start with bellow error:
...
Error starting domain: unsupported configuration: The QEMU executable /usr/libexec/qemu-kvm does not support TPM backend type passthrough
Traceback (most recent call last):
File "/usr/share/virt-manager/virtManager/asyncjob.py", line 89, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
File "/usr/share/virt-manager/virtManager/asyncjob.py", line 125, in tmpcb
    callback(*args, **kwargs)
File "/usr/share/virt-manager/virtManager/libvirtobject.py", line 83, in newfn
    ret = fn(self, *args, **kwargs)
File "/usr/share/virt-manager/virtManager/domain.py", line 1433, in startup
    self._backend.create()
File "/usr/lib64/python2.7/site-packages/libvirt.py", line 1029, in create
    if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
libvirtError: unsupported configuration: The QEMU executable /usr/libexec/qemu-kvm does not support TPM backend type passthrough
...

Expected results:
Guest should start normally.


Additional info:

On RHEL 7.2

# rpm -q qemu-kvm
qemu-kvm-1.5.3-105.el7_2.3.x86_64
# /usr/libexec/qemu-kvm --help | grep -i tpm
<no output>

On Fedora 23

# rpm -q qemu-kvm
qemu-kvm-2.4.1-8.fc23.x86_64
# /usr/bin/qemu-kvm --help | grep -i tpm
TPM device options: -tpmdev passthrough,id=id[,path=path][,cancel-path=path]
            use path to provide path to a character device; default is /dev/tpm0
            use cancel-path to provide path to TPM's cancel sysfs entry;
            if not provided it will be searched for in /sys/class/misc/tpm?/device

Installed tpl-tools package.

# ls -al /lib/modules/$(uname -r)/kernel/drivers/char/tpm
total 128
drwxr-xr-x. 2 root root 4096 Apr 2 16:08 .
drwxr-xr-x. 5 root root 4096 Apr 2 16:08 ..
-rw-r--r--. 1 root root 11241 Mar 1 03:55 tpm_atmel.ko
-rw-r--r--. 1 root root 12097 Mar 1 03:55 tpm_crb.ko
-rw-r--r--. 1 root root 11793 Mar 1 03:55 tpm_i2c_atmel.ko
-rw-r--r--. 1 root root 16121 Mar 1 03:55 tpm_i2c_infineon.ko
-rw-r--r--. 1 root root 21857 Mar 1 03:55 tpm_i2c_nuvoton.ko
-rw-r--r--. 1 root root 25225 Mar 1 03:55 tpm_infineon.ko
-rw-r--r--. 1 root root 15969 Mar 1 03:55 tpm_nsc.ko

# tpm_version
TPM 1.2 Version Info:
Chip Version: 1.2.6.40
Spec Level: 2
Errata Revision: 3
TPM Vendor ID: IFX
Vendor Specific data: 062800be 0074706d 733038ff ff
TPM Version: 01010000
Manufacturer Info: 49465800