The following series of patches implements a multi-instance vTPM proxy driver that can dynamically create TPM 'server' and client device pairs.
Using an ioctl on the provided /dev/vtpmx, a client-side vTPM device and a server side file descriptor is created. The file descriptor must be passed to a TPM emulator. The device driver will initialize the emulated TPM using TPM 1.2 or TPM 2 startup commands and it will read the command durations from the device in case of a TPM 1.2. The choice of emulated TPM device (1.2 or 2) must be provided with a flag in the ioctl. The patches are based on a recent checkout of Jarkko's tree (master branch). Stefan v8->v9: - move constant from public header into tpm_vtpm_proxy.c - Replaced VTPM_PROXY_MAGIC in ioctl definition with its value (0xa1) - Check for the STATE_OPEN_FLAG in wait_event_interruptable and after returning from it v7->v8: - minor tweaks on the documentation - Reordered function calls in the VTPM proxy driver's server side release function so that a client holding the 'ops' lock releases it before the driver tries to grab the lock when unregistering the device. v6->v7: - Adjusted name of driver to tpm_vtpm_proxy from tpm_vtpm. Adjust function names, names of structures, and names of constants. - Adjusted IOCTL to use magic 0xa1 rather than the completely used 0xa0. - Extended driver documentation and added documentation of ioctl. - Moved test program to own project (dropped patch 11). v5->v6: - Adapted errno's for unsupported flags and ioctls following Jason's comments v4->v5: - Introduced different error codes for unsupported flags and ioctls - Added documentation patch Stefan Berger (4): tpm: Introduce TPM_CHIP_FLAG_VIRTUAL tpm: Proxy driver for supporting multiple emulated TPMs tpm: Initialize TPM and get durations and timeouts tpm: Add documentation for the tpm_vtpm device driver Documentation/ioctl/ioctl-number.txt | 1 + Documentation/tpm/tpm_vtpm_proxy.txt | 71 ++++ drivers/char/tpm/Kconfig | 10 + drivers/char/tpm/Makefile | 1 + drivers/char/tpm/tpm-chip.c | 9 +- drivers/char/tpm/tpm-sysfs.c | 15 +- drivers/char/tpm/tpm.h | 5 +- drivers/char/tpm/tpm_vtpm_proxy.c | 650 +++++++++++++++++++++++++++++++++++ include/uapi/linux/Kbuild | 1 + include/uapi/linux/vtpm_proxy.h | 36 ++ 10 files changed, 789 insertions(+), 10 deletions(-) create mode 100644 Documentation/tpm/tpm_vtpm_proxy.txt create mode 100644 drivers/char/tpm/tpm_vtpm_proxy.c create mode 100644 include/uapi/linux/vtpm_proxy.h -- 2.4.3
