[Qemu-devel] [PATCH V9 0/5] Qemu Trusted Platform Module (TPM) integration

[Stefan Berger]

The following series of patches adds TPM (Trusted Platform Module) support
to Qemu. An emulator for the TIS (TPM Interface Spec) interface is
added that provides the basis for accessing a 'backend' implementing the actual
TPM functionality. The TIS emulator serves as a 'frontend' enabling for
example Linux's TPM TIS (tpm_tis) driver.

In this series I am posting a backend implementation that makes use of the
host's TPM through a passthrough driver, which on Linux is accessed
using /dev/tpm0.

v9:
 - addressed Michael Tsirkin's and other reviewers' comments
 - only posting Andreas Niederl's passthrough driver as the backend driver

v8:
 - applies to checkout of f0fb8b7 (Aug 30)
 - fixing compilation error pointed out by Andreas Niederl
 - adding patch that allows to feed an initial state into the libtpms TPM
 - following memory API changes (glib) where necessary

v7:
 - applies to checkout of b9c6cbf (Aug 9)
 - measuring the modules if multiboot is used
 - coding style fixes

v6:
 - applies to checkout of 75ef849 (July 2nd)
 - some fixes and improvements to existing patches; see individual patches
 - added a patch with a null driver responding to all TPM requests with
   a response indicating failure; this backend has no dependencies and
   can alwayy be built;
 - added a patch to support the hashing of kernel, ramfs and command line
   if those were passed to Qemu using -kernel, -initrd and -append
   respectively. Measurements are taken, logged, and passed to SeaBIOS using
   the firmware interface.
 - libtpms revision 7 now requires 83kb of block storage due to having more
   NVRAM space

v5:
 - applies to checkout of 1fddfba1
 - adding support for split command line using the -tpmdev ... -device ...
   options while keeping the -tpm option
 - support for querying the device models using -tpm model=?
 - support for monitor 'info tpm'
 - adding documentation of command line options for man page and web page
 - increasing room for ACPI tables that qemu reserves to 128kb (from 64kb)
 - adding (experimental) support for block migration
 - adding (experimental) support for taking measurements when kernel,
   initrd and kernel command line are directly passed to Qemu

v4:
 - applies to checkout of d2d979c6
 - more coding style fixes
 - adding patch for supporting blob encryption (in addition to the existing
   QCoW2-level encryption)
   - this allows for graceful termination of a migration if the target
     is detected to have a wrong key
   - tested with big and little endian hosts
 - main thread releases mutex while checking for work to do on behalf of
   backend
 - introducing file locking (fcntl) on the block layer for serializing access
   to shared (QCoW2) files (used during migration)

v3:
 - Building a null driver at patch 5/8 that responds to all requests
   with an error response; subsequently this driver is transformed to the
   libtpms-based driver for real TPM functionality
 - Reworked the threading; dropped the patch for qemu_thread_join; the
   main thread synchronizing with the TPM thread termination may need
   to write data to the block storage while waiting for the thread to 
   terminate; did not previously show a problem but is safer
 - A lot of testing based on recent git checkout 4b4a72e5 (4/10):
   - migration of i686 VM from x86_64 host to i686 host to ppc64 host while
     running tests inside the VM
   - tests with S3 suspend/resume
   - tests with snapshots
   - multiple-hour tests with VM suspend/resume (using virsh save/restore)
     while running a TPM test suite inside the VM
   All tests passed; [not all of them were done on the ppc64 host]

v2:
 - splitting some of the patches into smaller ones for easier review
 - fixes in individual patches

Regards,
    Stefan