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
** Changes in V2:
- Made spawnning swtpm optional
- used QIOChannel instead of plain unix sockets
- incorporated other fixes pointed in v1 review
** Changes in v3:
- Addressed review comments made by Stefan Berger and Deniel P Berrange
Amarnath Valluri (8):
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: Made few interface methods optional
tmp backend: Add new api to read backend TpmInfo
tpm-backend: Move realloc_buffer() implementation to base class
tpm-passthrough: move reusable code to utils
tpm: Added support for TPM emulator
backends/tpm.c | 121 +++--
configure | 15 +-
hmp.c | 31 +-
hw/tpm/Makefile.objs | 1 +
hw/tpm/tpm_emulator.c | 943 +++++++++++++++++++++++++++++++++++++++
hw/tpm/tpm_ioctl.h | 243 ++++++++++
hw/tpm/tpm_passthrough.c | 221 +++------
hw/tpm/tpm_util.c | 25 ++
hw/tpm/tpm_util.h | 4 +
include/sysemu/tpm_backend.h | 65 ++-
include/sysemu/tpm_backend_int.h | 41 --
qapi-schema.json | 67 ++-
qemu-options.hx | 53 ++-
tpm.c | 36 +-
14 files changed, 1545 insertions(+), 321 deletions(-)
create mode 100644 hw/tpm/tpm_emulator.c
create mode 100644 hw/tpm/tpm_ioctl.h
delete mode 100644 include/sysemu/tpm_backend_int.h