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author | Stefan Berger <stefanb@linux.vnet.ibm.com> | 2013-02-27 12:47:53 -0500 |
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committer | Anthony Liguori <aliguori@us.ibm.com> | 2013-03-12 13:40:55 -0500 |
commit | 4549a8b7ee3c47155c09582f31086f7d0ba61fc4 (patch) | |
tree | d538e99d507a004b8fcc10e1af38b78d10595190 /tpm/tpm_backend.c | |
parent | ab214c2960e3a6d2a86b1ff53e9ba2505d173f93 (diff) | |
download | hqemu-4549a8b7ee3c47155c09582f31086f7d0ba61fc4.zip hqemu-4549a8b7ee3c47155c09582f31086f7d0ba61fc4.tar.gz |
Add a TPM Passthrough backend driver implementation
This patch is based of off version 9 of Stefan Berger's patch series
"QEMU Trusted Platform Module (TPM) integration"
and adds a new backend driver for it.
This patch adds a passthrough backend driver for passing commands sent to the
emulated TPM device directly to a TPM device opened on the host machine.
Thus it is possible to use a hardware TPM device in a system running on QEMU,
providing the ability to access a TPM in a special state (e.g. after a Trusted
Boot).
This functionality is being used in the acTvSM Trusted Virtualization Platform
which is available on [1].
Usage example:
qemu-system-x86_64 -tpmdev passthrough,id=tpm0,path=/dev/tpm0 \
-device tpm-tis,tpmdev=tpm0 \
-cdrom test.iso -boot d
Some notes about the host TPM:
The TPM needs to be enabled and activated. If that's not the case one
has to go through the BIOS/UEFI and enable and activate that TPM for TPM
commands to work as expected.
It may be necessary to boot the kernel using tpm_tis.force=1 in the boot
command line or 'modprobe tpm_tis force=1' in case of using it as a module.
Regards,
Andreas Niederl, Stefan Berger
[1] http://trustedjava.sourceforge.net/
Signed-off-by: Andreas Niederl <andreas.niederl@iaik.tugraz.at>
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: Corey Bryant <coreyb@linux.vnet.ibm.com>
Reviewed-by: Joel Schopp <jschopp@linux.vnet.ibm.com>
Message-id: 1361987275-26289-6-git-send-email-stefanb@linux.vnet.ibm.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'tpm/tpm_backend.c')
-rw-r--r-- | tpm/tpm_backend.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/tpm/tpm_backend.c b/tpm/tpm_backend.c new file mode 100644 index 0000000..4144ef7 --- /dev/null +++ b/tpm/tpm_backend.c @@ -0,0 +1,58 @@ +/* + * common TPM backend driver functions + * + * Copyright (c) 2012-2013 IBM Corporation + * Authors: + * Stefan Berger <stefanb@us.ibm.com> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/> + */ + +#include "tpm/tpm.h" +#include "qemu/thread.h" +#include "tpm_backend.h" + +void tpm_backend_thread_deliver_request(TPMBackendThread *tbt) +{ + g_thread_pool_push(tbt->pool, (gpointer)TPM_BACKEND_CMD_PROCESS_CMD, NULL); +} + +void tpm_backend_thread_create(TPMBackendThread *tbt, + GFunc func, gpointer user_data) +{ + if (!tbt->pool) { + tbt->pool = g_thread_pool_new(func, user_data, 1, TRUE, NULL); + g_thread_pool_push(tbt->pool, (gpointer)TPM_BACKEND_CMD_INIT, NULL); + } +} + +void tpm_backend_thread_end(TPMBackendThread *tbt) +{ + if (tbt->pool) { + g_thread_pool_push(tbt->pool, (gpointer)TPM_BACKEND_CMD_END, NULL); + g_thread_pool_free(tbt->pool, FALSE, TRUE); + tbt->pool = NULL; + } +} + +void tpm_backend_thread_tpm_reset(TPMBackendThread *tbt, + GFunc func, gpointer user_data) +{ + if (!tbt->pool) { + tpm_backend_thread_create(tbt, func, user_data); + } else { + g_thread_pool_push(tbt->pool, (gpointer)TPM_BACKEND_CMD_TPM_RESET, + NULL); + } +} |