Re: [Xen-devel] [PATCH v3 0/5] QEMU:Xen stubdom vTPM for HVM virtual machine

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

Hi Quan,
thanks for the update: this version is much much better than the
previous one.

I am not familiar enough with QAPI, HMP and TPM to review the first and
the last patches though.

Cheers,

Stefano


On Tue, 30 Dec 2014, Quan Xu wrote:
> *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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