Briefly, Theses set of patches introduces: - new TPM backend driver to support software TPM emulators(swtpm(1)). - and few supported fixes/enhancements/cleanup to existing tpm backend code.
The similar idea was initiated earliar(2) by Stefan Berger(CCed) with slightly different approach, using CUSE. As swtpm has excellent support for unix domain sockets, hence this implementation uses unix domain sockets to communicate with swtpm. When Qemu is configured with 'emulator' tpm backend, it spawns 'swtpm' and communicates its via Unix domain sockets. 1) https://github.com/stefanberger/swtpm 2) https://lists.nongnu.org/archive/html/qemu-devel/2016-01/msg00089.html Amarnath Valluri (7): tpm-backend: Remove unneeded member variable from backend class tpm-backend: Move thread handling inside TPMBackend tpm-backend: Initialize and free data members in it's own methods tpm-backend: Call interface methods only if backend implements them tmp backend: Add new api to read backend tpm options tpm-passthrough: move reusable code to utils tpm: New backend driver to support TPM emulator backends/tpm.c | 102 ++++-- configure | 6 + hmp.c | 14 + hw/tpm/Makefile.objs | 1 + hw/tpm/tpm_emulator.c | 740 +++++++++++++++++++++++++++++++++++++++ hw/tpm/tpm_ioctl.h | 243 +++++++++++++ hw/tpm/tpm_passthrough.c | 213 +++-------- hw/tpm/tpm_util.c | 94 +++++ hw/tpm/tpm_util.h | 11 + include/sysemu/tpm_backend.h | 35 +- include/sysemu/tpm_backend_int.h | 19 +- qapi-schema.json | 34 +- qemu-options.hx | 25 +- tpm.c | 22 +- 14 files changed, 1326 insertions(+), 233 deletions(-) create mode 100644 hw/tpm/tpm_emulator.c create mode 100644 hw/tpm/tpm_ioctl.h -- 2.7.4
