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This document describes the virtual Trusted Platform Module (vTPM)proxy device driver for Linux containers.

Introduction¶

The goal of this work is to provide TPM functionality to each Linuxcontainer. This allows programs to interact with a TPM in a containerthe same way they interact with a TPM on the physical system. Eachcontainer gets its own unique, emulated, software TPM.

Design¶

To make an emulated software TPM available to each container, the containermanagement stack needs to create a device pair consisting of a client TPMcharacter device /dev/tpmX (with X=0,1,2…) and a ‘server side’ filedescriptor. The former is moved into the container by creating a characterdevice with the appropriate major and minor numbers while the file descriptoris passed to the TPM emulator. Software inside the container can then sendTPM commands using the character device and the emulator will receive thecommands via the file descriptor and use it for sending back responses.

To support this, the virtual TPM proxy driver provides a device /dev/vtpmxthat is used to create device pairs using an ioctl. The ioctl takes asan input flags for configuring the device. The flags for example indicatewhether TPM 1.2 or TPM 2 functionality is supported by the TPM emulator.The result of the ioctl are the file descriptor for the ‘server side’as well as the major and minor numbers of the character device that was created.Besides that the number of the TPM character device is returned. If forexample /dev/tpm10 was created, the number (dev_num) 10 is returned.

Once the device has been created, the driver will immediately try to talkto the TPM. All commands from the driver can be read from the file descriptorreturned by the ioctl. The commands should be responded to immediately.

UAPI¶

flags for the proxy TPM

Constants

VTPM_PROXY_FLAG_TPM2

the proxy TPM uses TPM 2.0 protocol

parameter structure for the VTPM_PROXY_IOC_NEW_DEV ioctl

Definition

Members

flags

flags for the proxy TPM

tpm_num

index of the TPM device

fd

the file descriptor used by the proxy TPM

major

the major number of the TPM device

minor

the minor number of the TPM device

handler for the VTPM_PROXY_IOC_NEW_DEV ioctl

Parameters

structfile*file

/dev/vtpmx

unsignedintioctl

the ioctl number

unsignedlongarg

pointer to the struct vtpmx_proxy_new_dev

Description

Creates an anonymous file that is used by the process acting as a TPM tocommunicate with the client processes. The function will also add a new TPMdevice through which data is proxied to this TPM acting process. The callerwill be provided with a file descriptor to communicate with the clients andmajor and minor numbers for the TPM device.

If you see a yellow exclamation mark next to one of your PCI drivers listed under Other devices or Unknown devices in the Device Manager, and you have no idea what to do, you’re not alone. Many Windows users are reporting about this problem. But no worries, it’s possible to fix, however horrifying the scene looks.

Here are 3 solutions for you to choose.You may not have to try them all; just work your way down until you find the one works for you.

What is PCI device driver?

PCI stands for Peripheral Component Interconnect. The PCI device you see in Device Manager indicates the piece of hardware that plugs into your computer’s motherboard, such as PCI Simple Communications Controllers and PCI data Acquisition and Signal Processing Controller as shown in the above screen shot. These are the hardware devices that keep your PC running smoothly.

If these device drivers fail to work properly, your PC suffers.

How do I fix it?

Note: The screen shots below are shown on Windows 7, but all fixes apply to Windows 10 and Windows 8 as well.

Method 1: Update PCI device driver via Device Manager
Method 2: Update PCI device driver Manually
Method 3: Update PCI device driver Automatically (Recommended)

Method 1. Update PCI device driver via Device Manager

The yellow exclamation mark next to certain device problem can usually be fixed with an appropriate and matched device driver.

Tpmx Input Devices Driver Download Mac

1) On your keyboard, press the Windows logo key and R at the same time, type devmgmt.msc and press Enter.

2) If you can see clearly the name of the PCI device as the screen shot shown below (PCI Simple Communications Controller), just go to the manufacturer website of your computer and search for the exact driver from there.

If the computer is assembled by yourself, which means that there is not a definite manufacturer that you can turn to, you can use Driver Easy to help you download the drivers needed for free.

Method 2. Update PCI device driver Manually

If you are not sure which manufacturer website to turn to, you can use the hardware ID to search for the correct driver for you:

1) On your keyboard, press the Windows logo key and R at the same time, type devmgmt.msc and press Enter.

2) Expand Other devices. Double-click PCI Device.

3) Go to Details, select Hardware Ids from the drop-down box.

4) Now, let’s try the first ID listed here first. Copy the first hardware ID listed.

5) Paste it to the search box of the searching engine. Please also add key words such driver or your operating system.

Tpmx Input Devices Driver Download Windows 7

6) Download the correct driver from the list provided. Then you need to install them as instructed by the driver provider.

Method 3. Update PCI Driver Automatically (Recommended)

If you don’t have the time, patience or computer skills to update your drivers manually, you can do it automatically with Driver Easy.

Driver Easy will automatically recognize your system and find the correct drivers for it. You don’t need to know exactly what system your computer is running, you don’t need to risk downloading and installing the wrong driver, and you don’t need to worry about making a mistake when installing.

You can update your drivers automatically with either the FREE or the Pro version of Driver Easy. But with the Pro version it takes just 2 clicks (and you get full support and a 30-day money back guarantee):

1) Downloadand install Driver Easy.

2) Run Driver Easy and click the Scan Now button. Driver Easy will then scan your computer and detect any problem drivers.

3) Click the Update button next to the flagged PCI device to automatically download and install the correct version of its driver (you can do this with the FREE version).

Or click Update All to automatically download and install the correct version of all the drivers that are missing or out of date on your system (this requires the Pro version– you’ll be prompted to upgrade when you click Update All).

We hope this post can meet your needs. If you have any questions or suggestions, feel free to leave comments below. It would be very nice of you if you are willing to click the thumb button below.