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[Qemu-devel] [PATCH v4 0/5] QEMU:Xen stubdom vTPM for HVM virtual machin

From: Quan Xu
Subject: [Qemu-devel] [PATCH v4 0/5] QEMU:Xen stubdom vTPM for HVM virtual machine
Date: Tue, 10 Mar 2015 08:14:28 -0400

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.

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

 * 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 v4:
    -Fix the comment style
    -Redesign vTPM xenstore architecture for HVM virtual machine.
    -Remove unnecessary busy loop.
    -Call xen_fe_register(vtpm ...) directly and move some initialzation
     chunk in the xen_vtpmdev_ops .init function.
    -New xen_pvdev.c file
    -Move xendevs queue to xen_pvdev.c
    -Move xenstore functions to xen_pvdev.c
    -Check status before setting the frontend to connect
    -qapi schema enhancement.
    -remove no need code.

--Changes in v3:
    -New xen_frontend.c file
    -Adjust the format of command line options
    -Move xenbus_switch_state() to xen_frontend.c
    -Move xen_stubdom_be() to xenstore_fe_read_be_str()
    -Move *_stubdom_*() to *_fe_*()
    -Move xen_stubdom_vtpm.c to xen_vtpm_frontend.c
    -Read Xen vTPM status via XenStore
    -Call vtpm_send() and vtpm_recv() directly.

--Changes in v2:
    -adding xen_fe_register() that handle any Xen PV frontend registration
    -remove a private structure 'QEMUBH'
    -change version number to 2.3 in qapi-schema.json
    -move hw/xen/xen_stubdom_vtpm.c to hw/tpm/xen_stubdom_vtpm.c

Quan Xu (5):
  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: Qemu vTPM xenstubdoms backen.
  Qemu-Xen-vTPM: QEMU machine class is initialized before tpm_init()

 configure                    |  14 ++
 hmp.c                        |   2 +
 hw/display/xenfb.c           |   4 +-
 hw/tpm/Makefile.objs         |   1 +
 hw/tpm/tpm_xenstubdoms.c     | 247 ++++++++++++++++++++++
 hw/tpm/xen_vtpm_frontend.c   | 278 +++++++++++++++++++++++++
 hw/xen/Makefile.objs         |   2 +-
 hw/xen/xen_backend.c         | 353 -------------------------------
 hw/xen/xen_frontend.c        | 365 ++++++++++++++++++++++++++++++++
 hw/xen/xen_pvdev.c           | 481 +++++++++++++++++++++++++++++++++++++++++++
 include/hw/xen/xen_backend.h |  27 ++-
 include/hw/xen/xen_common.h  |   6 +
 qapi-schema.json             |  18 +-
 qemu-options.hx              |  13 +-
 tpm.c                        |   7 +-
 vl.c                         |  17 +-
 xen-hvm.c                    |   5 +
 17 files changed, 1472 insertions(+), 368 deletions(-)
 create mode 100644 hw/tpm/tpm_xenstubdoms.c
 create mode 100644 hw/tpm/xen_vtpm_frontend.c
 create mode 100644 hw/xen/xen_frontend.c
 create mode 100644 hw/xen/xen_pvdev.c


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