[Qemu-devel] [v9 00/19] QEMU:Xen stubdom vTPM for HVM virtual machine(QEMU Part)

[Emil Condrea]

*INTRODUCTION*
The goal of virtual Trusted Platform Module (vTPM) is to provide a TPM
functionality to virtual machines (Fedora, Ubuntu, Redhat, Windows .etc).
This allows programs to interact with a TPM in a virtual machine the same
way they interact with a TPM on the physical system. Each virtual machine
gets its own unique, emulated, software TPM. Each major component of vTPM
is implemented as a stubdom, providing secure separation guaranteed by the
hypervisor.

The vTPM stubdom is a Xen mini-OS domain that emulates a TPM for the virtual
machine to use. It is a small wrapper around the Berlios TPM emulator. TPM
commands are passed from mini-os TPM backend driver.

*ARCHITECTURE*
The architecture of stubdom vTPM for HVM virtual machine:

            +--------------------+
            | Windows/Linux DomU | ...
            |        |  ^        |
            |        v  |        |
            |  Qemu tpm1.2 Tis   |
            |        |  ^        |
            |        v  |        |
            | XenStubdoms backend|
            +--------------------+
                     |  ^
                     v  |
            +--------------------+
            |      XenDevOps     |
            +--------------------+
                     |  ^
                     v  |
            +--------------------+
            |  mini-os/tpmback   |
            |        |  ^        |
            |        v  |        |
            |   vtpm-stubdom     | ...
            |        |  ^        |
            |        v  |        |
            |  mini-os/tpmfront  |
            +--------------------+
                     |  ^
                     v  |
            +--------------------+
            |  mini-os/tpmback   |
            |        |  ^        |
            |        v  |        |
            |  vtpmmgr-stubdom   |
            |        |  ^        |
            |        v  |        |
            |  mini-os/tpm_tis   |
            +--------------------+
                     |  ^
                     v  |
            +--------------------+
            |    Hardware TPM    |
            +--------------------+

 * Windows/Linux DomU:
    The HVM based guest that wants to use a vTPM. There may be
    more than one of these.

 * Qemu tpm1.2 Tis:
    Implementation of the tpm1.2 Tis interface for HVM virtual
    machines. It is Qemu emulation device.

 * vTPM xenstubdoms driver:
    Qemu vTPM driver. This driver provides vtpm initialization
    and sending data and commends to a para-virtualized vtpm
    stubdom.

 * XenDevOps:
    Register Xen stubdom vTPM frontend driver, and transfer any
    request/repond between TPM xenstubdoms driver and Xen vTPM
    stubdom. Facilitate communications between Xen vTPM stubdom
    and vTPM xenstubdoms driver.

 * mini-os/tpmback:
    Mini-os TPM backend driver. The Linux frontend driver connects
    to this backend driver to facilitate communications between the
    Linux DomU and its vTPM. This driver is also used by vtpmmgr
    stubdom to communicate with vtpm-stubdom.

 * vtpm-stubdom:
    A mini-os stub domain that implements a vTPM. There is a
    one to one mapping between running vtpm-stubdom instances and
    logical vtpms on the system. The vTPM Platform Configuration
    Registers (PCRs) are all initialized to zero.

 * mini-os/tpmfront:
    Mini-os TPM frontend driver. The vTPM mini-os domain vtpm
    stubdom uses this driver to communicate with vtpmmgr-stubdom.
    This driver could also be used separately to implement a mini-os
    domain that wishes to use a vTPM of its own.

 * vtpmmgr-stubdom:
    A mini-os domain that implements the vTPM manager. There is only
    one vTPM manager and it should be running during the entire lifetime
    of the machine. vtpmmgr domain securely stores encryption keys for
    each of the vtpms and accesses to the hardware TPM to get the root of
    trust for the entire system.

 * mini-os/tpm_tis:
    Mini-os TPM version 1.2 TPM Interface Specification (TIS) driver.
    This driver used by vtpmmgr-stubdom to talk directly to the hardware
    TPM. Communication is facilitated by mapping hardware memory pages
    into vtpmmgr stubdom.

 * Hardware TPM: The physical TPM 1.2 that is soldered onto the motherboard.

---
Changes in v9
High level changes: (each patch has a detailed history versioning)
 * rebase on upstream qemu
 * refactor qemu xendevs, xenstore functions in order to be shared with both 
backend and frontends
 * convert tpm stubdoms to new qapi layout
 * use libxengnttab, libxenevtchn stable API instead of xc_* calls
 * added reset_tpm_established_flag and get_tpm_version for TPMDriverOps
 * instead of xen_frontend.c global variable xenstore_dev, use vtpm specific
xenstore_vtpm_dev (since it will be needed just for tpm_xenstubdoms qemu driver)


Emil Condrea (19):
  xen: Create a new file xen_pvdev.c
  xen: Create a new file xen_frontend.c
  xen: Move xenstore_update to xen_pvdev.c
  xen: Move evtchn functions to xen_pvdev.c
  xen: Prepare xendev qtail to be shared with frontends
  xen: Rename xen_be_printf to xen_pv_printf
  xen: Rename xen_be_unbind_evtchn
  xen: Rename xen_be_send_notify
  xen: Rename xen_be_evtchn_event
  xen: Rename xen_be_find_xendev
  xen: Rename xen_be_del_xendev
  xen: Rename xen_be_frontend_changed
  xen: Distinguish between frontend and backend devops
  Qemu-Xen-vTPM: Support for Xen stubdom vTPM command line options
  Qemu-Xen-vTPM: Xen frontend driver infrastructure
  Qemu-Xen-vTPM: Register Xen stubdom vTPM frontend driver
  Qemu-Xen-vTPM: Move tpm_passthrough_is_selftest() into tpm_util.c
  Qemu-Xen-vTPM: Qemu vTPM xenstubdoms backend
  Qemu-Xen-vTPM: QEMU machine class is initialized before tpm_init()

 backends/tpm.c                   |  11 ++
 configure                        |  14 ++
 hmp.c                            |   2 +
 hw/block/xen_disk.c              |  59 +++---
 hw/char/xen_console.c            |  16 +-
 hw/display/xenfb.c               |  57 +++---
 hw/net/xen_nic.c                 |  29 +--
 hw/tpm/Makefile.objs             |   3 +-
 hw/tpm/tpm_passthrough.c         |  13 +-
 hw/tpm/tpm_util.c                |  11 ++
 hw/tpm/tpm_util.h                |   1 +
 hw/tpm/tpm_xenstubdoms.c         | 284 ++++++++++++++++++++++++++
 hw/tpm/xen_vtpm_frontend.c       | 303 ++++++++++++++++++++++++++++
 hw/tpm/xen_vtpm_frontend.h       |  10 +
 hw/usb/xen-usb.c                 |  38 ++--
 hw/xen/Makefile.objs             |   2 +-
 hw/xen/xen_backend.c             | 378 ++++-------------------------------
 hw/xen/xen_devconfig.c           |   4 +-
 hw/xen/xen_frontend.c            | 416 +++++++++++++++++++++++++++++++++++++++
 hw/xen/xen_pvdev.c               | 298 ++++++++++++++++++++++++++++
 include/hw/xen/xen_backend.h     |  71 +------
 include/hw/xen/xen_frontend.h    |  20 ++
 include/hw/xen/xen_pvdev.h       |  83 ++++++++
 include/sysemu/tpm_backend_int.h |   2 +
 qapi-schema.json                 |  16 +-
 qemu-options.hx                  |  13 +-
 tpm.c                            |   7 +-
 vl.c                             |  17 +-
 xen-common.c                     |   4 +-
 xen-hvm.c                        |   6 +
 30 files changed, 1649 insertions(+), 539 deletions(-)
 create mode 100644 hw/tpm/tpm_xenstubdoms.c
 create mode 100644 hw/tpm/xen_vtpm_frontend.c
 create mode 100644 hw/tpm/xen_vtpm_frontend.h
 create mode 100644 hw/xen/xen_frontend.c
 create mode 100644 hw/xen/xen_pvdev.c
 create mode 100644 include/hw/xen/xen_frontend.h
 create mode 100644 include/hw/xen/xen_pvdev.h

-- 
1.9.1