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This module allows presenting the kernel TPM interface while proxying the TPM commands into a file descriptor. The module was originally implemented to support running a TPM simulator on the same host system and exposing a kernel TPM interface to a Linux container, but it is also a convenient incremental step while we figure out our long-term strategy with crosvm, which does not have TPM support following the same standards as qemu. CONFIG_TCG_TPM, the base config for the various TPM drivers, required CONFIG_SECURITYFS. CONFIG_SECURITYFS exists only as a boolean and not a tristate, so we can't install it as a module. Bug: 148102533 Test: Build and run locally with cuttlefish, check for /dev/vtpmx Change-Id: I568a50c2ecb7899aae70e7a20efaedc84443511d Signed-off-by: A. Cody Schuffelen <schuffelen@google.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.