Re: [Qemu-devel] [PATCH v3 0/8] Provide support for the software TPM emulator

[Stefan Berger <stefanb@linux.vnet.ibm.com>]

On 05/02/2017 07:52 AM, Amarnath Valluri wrote:
> 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.

I think you would need something like this as well:

https://github.com/stefanberger/qemu-tpm/commit/9d8c9c3f0df288242d03f78d3b103099c1910574
https://github.com/stefanberger/qemu-tpm/commit/b9ea09d2e26eac92b4a1604a7afa695c4fc2735e



>
>    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
>