*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 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 | 7 +
hw/tpm/Makefile.objs | 1 +
hw/tpm/tpm_xenstubdoms.c | 245 ++++++++++++++++++++++++++++++++
hw/tpm/xen_vtpm_frontend.c | 264 +++++++++++++++++++++++++++++++++++
hw/xen/Makefile.objs | 2 +-
hw/xen/xen_backend.c | 45 +++++-
hw/xen/xen_frontend.c | 323 +++++++++++++++++++++++++++++++++++++++++++
include/hw/xen/xen_backend.h | 19 +++
include/hw/xen/xen_common.h | 6 +
qapi-schema.json | 19 ++-
qemu-options.hx | 13 +-
tpm.c | 7 +-
vl.c | 16 ++-
xen-hvm.c | 16 +++
15 files changed, 983 insertions(+), 14 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
--
1.8.3.2
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