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authorStefan Berger <stefanb@linux.vnet.ibm.com>2013-02-27 12:47:53 -0500
committerAnthony Liguori <aliguori@us.ibm.com>2013-03-12 13:40:55 -0500
commit4549a8b7ee3c47155c09582f31086f7d0ba61fc4 (patch)
treed538e99d507a004b8fcc10e1af38b78d10595190
parentab214c2960e3a6d2a86b1ff53e9ba2505d173f93 (diff)
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>
-rw-r--r--include/qemu/sockets.h1
-rw-r--r--qemu-char.c24
-rw-r--r--qemu-options.hx36
-rw-r--r--tpm/Makefile.objs2
-rw-r--r--tpm/tpm.c14
-rw-r--r--tpm/tpm_backend.c58
-rw-r--r--tpm/tpm_backend.h45
-rw-r--r--tpm/tpm_int.h33
-rw-r--r--tpm/tpm_passthrough.c387
9 files changed, 599 insertions, 1 deletions
diff --git a/include/qemu/sockets.h b/include/qemu/sockets.h
index 6125bf7bdf..c5cee4bf2f 100644
--- a/include/qemu/sockets.h
+++ b/include/qemu/sockets.h
@@ -38,6 +38,7 @@ int socket_set_nodelay(int fd);
void socket_set_block(int fd);
void socket_set_nonblock(int fd);
int send_all(int fd, const void *buf, int len1);
+int recv_all(int fd, void *buf, int len1, bool single_read);
/* callback function for nonblocking connect
* valid fd on success, negative error code on failure
diff --git a/qemu-char.c b/qemu-char.c
index 04aa589c7e..83787c74c4 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -533,6 +533,30 @@ int send_all(int fd, const void *_buf, int len1)
}
return len1 - len;
}
+
+int recv_all(int fd, void *_buf, int len1, bool single_read)
+{
+ int ret, len;
+ uint8_t *buf = _buf;
+
+ len = len1;
+ while ((len > 0) && (ret = read(fd, buf, len)) != 0) {
+ if (ret < 0) {
+ if (errno != EINTR && errno != EAGAIN) {
+ return -1;
+ }
+ continue;
+ } else {
+ if (single_read) {
+ return ret;
+ }
+ buf += ret;
+ len -= ret;
+ }
+ }
+ return len1 - len;
+}
+
#endif /* !_WIN32 */
typedef struct IOWatchPoll
diff --git a/qemu-options.hx b/qemu-options.hx
index 291932faae..0be16b4d76 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -2221,7 +2221,8 @@ DEFHEADING()
DEFHEADING(TPM device options:)
DEF("tpmdev", HAS_ARG, QEMU_OPTION_tpmdev, \
- "-tpmdev [<type>],id=str[,option][,option][,...]\n",
+ "-tpmdev passthrough,id=id[,path=path]\n"
+ " use path to provide path to a character device; default is /dev/tpm0\n",
QEMU_ARCH_ALL)
STEXI
@@ -2231,6 +2232,7 @@ The general form of a TPM device option is:
@item -tpmdev @var{backend} ,id=@var{id} [,@var{options}]
@findex -tpmdev
Backend type must be:
+@option{passthrough}.
The specific backend type will determine the applicable options.
The @code{-tpmdev} option requires a @code{-device} option.
@@ -2242,6 +2244,38 @@ Use 'help' to print all available TPM backend types.
qemu -tpmdev help
@end example
+@item -tpmdev passthrough, id=@var{id}, path=@var{path}
+
+(Linux-host only) Enable access to the host's TPM using the passthrough
+driver.
+
+@option{path} specifies the path to the host's TPM device, i.e., on
+a Linux host this would be @code{/dev/tpm0}.
+@option{path} is optional and by default @code{/dev/tpm0} is used.
+
+Some notes about using the host's TPM with the passthrough driver:
+
+The TPM device accessed by the passthrough driver must not be
+used by any other application on the host.
+
+Since the host's firmware (BIOS/UEFI) has already initialized the TPM,
+the VM's firmware (BIOS/UEFI) will not be able to initialize the
+TPM again and may therefore not show a TPM-specific menu that would
+otherwise allow the user to configure the TPM, e.g., allow the user to
+enable/disable or activate/deactivate the TPM.
+Further, if TPM ownership is released from within a VM then the host's TPM
+will get disabled and deactivated. To enable and activate the
+TPM again afterwards, the host has to be rebooted and the user is
+required to enter the firmware's menu to enable and activate the TPM.
+If the TPM is left disabled and/or deactivated most TPM commands will fail.
+
+To create a passthrough TPM use the following two options:
+@example
+-tpmdev passthrough,id=tpm0 -device tpm-tis,tpmdev=tpm0
+@end example
+Note that the @code{-tpmdev} id is @code{tpm0} and is referenced by
+@code{tpmdev=tpm0} in the device option.
+
@end table
ETEXI
diff --git a/tpm/Makefile.objs b/tpm/Makefile.objs
index 94ad2e700b..86768244e4 100644
--- a/tpm/Makefile.objs
+++ b/tpm/Makefile.objs
@@ -1,4 +1,6 @@
common-obj-y = tpm.o
ifeq ($(CONFIG_TPM),y)
+common-obj-y += tpm_backend.o
common-obj-$(CONFIG_TPM_TIS) += tpm_tis.o
+common-obj-$(CONFIG_TPM_PASSTHROUGH) += tpm_passthrough.o
endif
diff --git a/tpm/tpm.c b/tpm/tpm.c
index 02735493c5..ffd24956d7 100644
--- a/tpm/tpm.c
+++ b/tpm/tpm.c
@@ -61,6 +61,20 @@ static bool tpm_model_is_registered(enum TpmModel model)
return false;
}
+/*
+ * Write an error message in the given output buffer.
+ */
+void tpm_write_fatal_error_response(uint8_t *out, uint32_t out_len)
+{
+ if (out_len >= sizeof(struct tpm_resp_hdr)) {
+ struct tpm_resp_hdr *resp = (struct tpm_resp_hdr *)out;
+
+ resp->tag = cpu_to_be16(TPM_TAG_RSP_COMMAND);
+ resp->len = cpu_to_be32(sizeof(struct tpm_resp_hdr));
+ resp->errcode = cpu_to_be32(TPM_FAIL);
+ }
+}
+
const TPMDriverOps *tpm_get_backend_driver(const char *type)
{
int i;
diff --git a/tpm/tpm_backend.c b/tpm/tpm_backend.c
new file mode 100644
index 0000000000..4144ef7d76
--- /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);
+ }
+}
diff --git a/tpm/tpm_backend.h b/tpm/tpm_backend.h
new file mode 100644
index 0000000000..05d94d0f5b
--- /dev/null
+++ b/tpm/tpm_backend.h
@@ -0,0 +1,45 @@
+/*
+ * 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/>
+ */
+
+#ifndef TPM_TPM_BACKEND_H
+#define TPM_TPM_BACKEND_H
+
+#include <glib.h>
+
+typedef struct TPMBackendThread {
+ GThreadPool *pool;
+} TPMBackendThread;
+
+void tpm_backend_thread_deliver_request(TPMBackendThread *tbt);
+void tpm_backend_thread_create(TPMBackendThread *tbt,
+ GFunc func, gpointer user_data);
+void tpm_backend_thread_end(TPMBackendThread *tbt);
+void tpm_backend_thread_tpm_reset(TPMBackendThread *tbt,
+ GFunc func, gpointer user_data);
+
+typedef enum TPMBackendCmd {
+ TPM_BACKEND_CMD_INIT = 1,
+ TPM_BACKEND_CMD_PROCESS_CMD,
+ TPM_BACKEND_CMD_END,
+ TPM_BACKEND_CMD_TPM_RESET,
+} TPMBackendCmd;
+
+#endif /* TPM_TPM_BACKEND_H */
diff --git a/tpm/tpm_int.h b/tpm/tpm_int.h
index d5358adf83..f7056436cc 100644
--- a/tpm/tpm_int.h
+++ b/tpm/tpm_int.h
@@ -18,6 +18,8 @@
struct TPMDriverOps;
typedef struct TPMDriverOps TPMDriverOps;
+typedef struct TPMPassthruState TPMPassthruState;
+
typedef struct TPMBackend {
char *id;
enum TpmModel fe_model;
@@ -25,6 +27,10 @@ typedef struct TPMBackend {
char *cancel_path;
const TPMDriverOps *ops;
+ union {
+ TPMPassthruState *tpm_pt;
+ } s;
+
QLIST_ENTRY(TPMBackend) list;
} TPMBackend;
@@ -74,10 +80,37 @@ struct TPMDriverOps {
bool (*get_tpm_established_flag)(TPMBackend *t);
};
+struct tpm_req_hdr {
+ uint16_t tag;
+ uint32_t len;
+ uint32_t ordinal;
+} QEMU_PACKED;
+
+struct tpm_resp_hdr {
+ uint16_t tag;
+ uint32_t len;
+ uint32_t errcode;
+} QEMU_PACKED;
+
+#define TPM_TAG_RQU_COMMAND 0xc1
+#define TPM_TAG_RQU_AUTH1_COMMAND 0xc2
+#define TPM_TAG_RQU_AUTH2_COMMAND 0xc3
+
+#define TPM_TAG_RSP_COMMAND 0xc4
+#define TPM_TAG_RSP_AUTH1_COMMAND 0xc5
+#define TPM_TAG_RSP_AUTH2_COMMAND 0xc6
+
+#define TPM_FAIL 9
+
+#define TPM_ORD_GetTicks 0xf1
+
TPMBackend *qemu_find_tpm(const char *id);
int tpm_register_model(enum TpmModel model);
int tpm_register_driver(const TPMDriverOps *tdo);
void tpm_display_backend_drivers(void);
const TPMDriverOps *tpm_get_backend_driver(const char *type);
+void tpm_write_fatal_error_response(uint8_t *out, uint32_t out_len);
+
+extern const TPMDriverOps tpm_passthrough_driver;
#endif /* TPM_TPM_INT_H */
diff --git a/tpm/tpm_passthrough.c b/tpm/tpm_passthrough.c
new file mode 100644
index 0000000000..760e18f034
--- /dev/null
+++ b/tpm/tpm_passthrough.c
@@ -0,0 +1,387 @@
+/*
+ * passthrough TPM driver
+ *
+ * Copyright (c) 2010 - 2013 IBM Corporation
+ * Authors:
+ * Stefan Berger <stefanb@us.ibm.com>
+ *
+ * Copyright (C) 2011 IAIK, Graz University of Technology
+ * Author: Andreas Niederl
+ *
+ * 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 "qemu-common.h"
+#include "qapi/error.h"
+#include "qemu/sockets.h"
+#include "tpm_int.h"
+#include "hw/hw.h"
+#include "hw/pc.h"
+#include "tpm_tis.h"
+#include "tpm_backend.h"
+
+/* #define DEBUG_TPM */
+
+#ifdef DEBUG_TPM
+#define DPRINTF(fmt, ...) \
+ do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, ...) \
+ do { } while (0)
+#endif
+
+/* data structures */
+
+typedef struct TPMPassthruThreadParams {
+ TPMState *tpm_state;
+
+ TPMRecvDataCB *recv_data_callback;
+ TPMBackend *tb;
+} TPMPassthruThreadParams;
+
+struct TPMPassthruState {
+ TPMBackendThread tbt;
+
+ TPMPassthruThreadParams tpm_thread_params;
+
+ char *tpm_dev;
+ int tpm_fd;
+ bool had_startup_error;
+};
+
+#define TPM_PASSTHROUGH_DEFAULT_DEVICE "/dev/tpm0"
+
+static int tpm_passthrough_unix_write(int fd, const uint8_t *buf, uint32_t len)
+{
+ return send_all(fd, buf, len);
+}
+
+static int tpm_passthrough_unix_read(int fd, uint8_t *buf, uint32_t len)
+{
+ return recv_all(fd, buf, len, true);
+}
+
+static uint32_t tpm_passthrough_get_size_from_buffer(const uint8_t *buf)
+{
+ struct tpm_resp_hdr *resp = (struct tpm_resp_hdr *)buf;
+
+ return be32_to_cpu(resp->len);
+}
+
+static int tpm_passthrough_unix_tx_bufs(int tpm_fd,
+ const uint8_t *in, uint32_t in_len,
+ uint8_t *out, uint32_t out_len)
+{
+ int ret;
+
+ ret = tpm_passthrough_unix_write(tpm_fd, in, in_len);
+ if (ret != in_len) {
+ error_report("tpm_passthrough: error while transmitting data "
+ "to TPM: %s (%i)\n",
+ strerror(errno), errno);
+ goto err_exit;
+ }
+
+ ret = tpm_passthrough_unix_read(tpm_fd, out, out_len);
+ if (ret < 0) {
+ error_report("tpm_passthrough: error while reading data from "
+ "TPM: %s (%i)\n",
+ strerror(errno), errno);
+ } else if (ret < sizeof(struct tpm_resp_hdr) ||
+ tpm_passthrough_get_size_from_buffer(out) != ret) {
+ ret = -1;
+ error_report("tpm_passthrough: received invalid response "
+ "packet from TPM\n");
+ }
+
+err_exit:
+ if (ret < 0) {
+ tpm_write_fatal_error_response(out, out_len);
+ }
+
+ return ret;
+}
+
+static int tpm_passthrough_unix_transfer(int tpm_fd,
+ const TPMLocality *locty_data)
+{
+ return tpm_passthrough_unix_tx_bufs(tpm_fd,
+ locty_data->w_buffer.buffer,
+ locty_data->w_offset,
+ locty_data->r_buffer.buffer,
+ locty_data->r_buffer.size);
+}
+
+static void tpm_passthrough_worker_thread(gpointer data,
+ gpointer user_data)
+{
+ TPMPassthruThreadParams *thr_parms = user_data;
+ TPMPassthruState *tpm_pt = thr_parms->tb->s.tpm_pt;
+ TPMBackendCmd cmd = (TPMBackendCmd)data;
+
+ DPRINTF("tpm_passthrough: processing command type %d\n", cmd);
+
+ switch (cmd) {
+ case TPM_BACKEND_CMD_PROCESS_CMD:
+ tpm_passthrough_unix_transfer(tpm_pt->tpm_fd,
+ thr_parms->tpm_state->locty_data);
+
+ thr_parms->recv_data_callback(thr_parms->tpm_state,
+ thr_parms->tpm_state->locty_number);
+ break;
+ case TPM_BACKEND_CMD_INIT:
+ case TPM_BACKEND_CMD_END:
+ case TPM_BACKEND_CMD_TPM_RESET:
+ /* nothing to do */
+ break;
+ }
+}
+
+/*
+ * Start the TPM (thread). If it had been started before, then terminate
+ * and start it again.
+ */
+static int tpm_passthrough_startup_tpm(TPMBackend *tb)
+{
+ TPMPassthruState *tpm_pt = tb->s.tpm_pt;
+
+ /* terminate a running TPM */
+ tpm_backend_thread_end(&tpm_pt->tbt);
+
+ tpm_backend_thread_create(&tpm_pt->tbt,
+ tpm_passthrough_worker_thread,
+ &tb->s.tpm_pt->tpm_thread_params);
+
+ return 0;
+}
+
+static void tpm_passthrough_reset(TPMBackend *tb)
+{
+ TPMPassthruState *tpm_pt = tb->s.tpm_pt;
+
+ DPRINTF("tpm_passthrough: CALL TO TPM_RESET!\n");
+
+ tpm_backend_thread_end(&tpm_pt->tbt);
+
+ tpm_pt->had_startup_error = false;
+}
+
+static int tpm_passthrough_init(TPMBackend *tb, TPMState *s,
+ TPMRecvDataCB *recv_data_cb)
+{
+ TPMPassthruState *tpm_pt = tb->s.tpm_pt;
+
+ tpm_pt->tpm_thread_params.tpm_state = s;
+ tpm_pt->tpm_thread_params.recv_data_callback = recv_data_cb;
+ tpm_pt->tpm_thread_params.tb = tb;
+
+ return 0;
+}
+
+static bool tpm_passthrough_get_tpm_established_flag(TPMBackend *tb)
+{
+ return false;
+}
+
+static bool tpm_passthrough_get_startup_error(TPMBackend *tb)
+{
+ TPMPassthruState *tpm_pt = tb->s.tpm_pt;
+
+ return tpm_pt->had_startup_error;
+}
+
+static size_t tpm_passthrough_realloc_buffer(TPMSizedBuffer *sb)
+{
+ size_t wanted_size = 4096; /* Linux tpm.c buffer size */
+
+ if (sb->size != wanted_size) {
+ sb->buffer = g_realloc(sb->buffer, wanted_size);
+ sb->size = wanted_size;
+ }
+ return sb->size;
+}
+
+static void tpm_passthrough_deliver_request(TPMBackend *tb)
+{
+ TPMPassthruState *tpm_pt = tb->s.tpm_pt;
+
+ tpm_backend_thread_deliver_request(&tpm_pt->tbt);
+}
+
+static void tpm_passthrough_cancel_cmd(TPMBackend *tb)
+{
+ /* cancelling an ongoing command is known not to work with some TPMs */
+}
+
+static const char *tpm_passthrough_create_desc(void)
+{
+ return "Passthrough TPM backend driver";
+}
+
+/*
+ * A basic test of a TPM device. We expect a well formatted response header
+ * (error response is fine) within one second.
+ */
+static int tpm_passthrough_test_tpmdev(int fd)
+{
+ struct tpm_req_hdr req = {
+ .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
+ .len = cpu_to_be32(sizeof(req)),
+ .ordinal = cpu_to_be32(TPM_ORD_GetTicks),
+ };
+ struct tpm_resp_hdr *resp;
+ fd_set readfds;
+ int n;
+ struct timeval tv = {
+ .tv_sec = 1,
+ .tv_usec = 0,
+ };
+ unsigned char buf[1024];
+
+ n = write(fd, &req, sizeof(req));
+ if (n < 0) {
+ return errno;
+ }
+ if (n != sizeof(req)) {
+ return EFAULT;
+ }
+
+ FD_ZERO(&readfds);
+ FD_SET(fd, &readfds);
+
+ /* wait for a second */
+ n = select(fd + 1, &readfds, NULL, NULL, &tv);
+ if (n != 1) {
+ return errno;
+ }
+
+ n = read(fd, &buf, sizeof(buf));
+ if (n < sizeof(struct tpm_resp_hdr)) {
+ return EFAULT;
+ }
+
+ resp = (struct tpm_resp_hdr *)buf;
+ /* check the header */
+ if (be16_to_cpu(resp->tag) != TPM_TAG_RSP_COMMAND ||
+ be32_to_cpu(resp->len) != n) {
+ return EBADMSG;
+ }
+
+ return 0;
+}
+
+static int tpm_passthrough_handle_device_opts(QemuOpts *opts, TPMBackend *tb)
+{
+ const char *value;
+
+ value = qemu_opt_get(opts, "path");
+ if (!value) {
+ value = TPM_PASSTHROUGH_DEFAULT_DEVICE;
+ }
+
+ tb->s.tpm_pt->tpm_dev = g_strdup(value);
+
+ tb->path = g_strdup(tb->s.tpm_pt->tpm_dev);
+
+ tb->s.tpm_pt->tpm_fd = qemu_open(tb->s.tpm_pt->tpm_dev, O_RDWR);
+ if (tb->s.tpm_pt->tpm_fd < 0) {
+ error_report("Cannot access TPM device using '%s': %s\n",
+ tb->s.tpm_pt->tpm_dev, strerror(errno));
+ goto err_free_parameters;
+ }
+
+ if (tpm_passthrough_test_tpmdev(tb->s.tpm_pt->tpm_fd)) {
+ error_report("'%s' is not a TPM device.\n",
+ tb->s.tpm_pt->tpm_dev);
+ goto err_close_tpmdev;
+ }
+
+ return 0;
+
+ err_close_tpmdev:
+ qemu_close(tb->s.tpm_pt->tpm_fd);
+ tb->s.tpm_pt->tpm_fd = -1;
+
+ err_free_parameters:
+ g_free(tb->path);
+ tb->path = NULL;
+
+ g_free(tb->s.tpm_pt->tpm_dev);
+ tb->s.tpm_pt->tpm_dev = NULL;
+
+ return 1;
+}
+
+static TPMBackend *tpm_passthrough_create(QemuOpts *opts, const char *id)
+{
+ TPMBackend *tb;
+
+ tb = g_new0(TPMBackend, 1);
+ tb->s.tpm_pt = g_new0(TPMPassthruState, 1);
+ tb->id = g_strdup(id);
+ /* let frontend set the fe_model to proper value */
+ tb->fe_model = -1;
+
+ tb->ops = &tpm_passthrough_driver;
+
+ if (tpm_passthrough_handle_device_opts(opts, tb)) {
+ goto err_exit;
+ }
+
+ return tb;
+
+err_exit:
+ g_free(tb->id);
+ g_free(tb->s.tpm_pt);
+ g_free(tb);
+
+ return NULL;
+}
+
+static void tpm_passthrough_destroy(TPMBackend *tb)
+{
+ TPMPassthruState *tpm_pt = tb->s.tpm_pt;
+
+ tpm_backend_thread_end(&tpm_pt->tbt);
+
+ qemu_close(tpm_pt->tpm_fd);
+
+ g_free(tb->id);
+ g_free(tb->path);
+ g_free(tb->s.tpm_pt->tpm_dev);
+ g_free(tb->s.tpm_pt);
+ g_free(tb);
+}
+
+const TPMDriverOps tpm_passthrough_driver = {
+ .type = TPM_TYPE_PASSTHROUGH,
+ .desc = tpm_passthrough_create_desc,
+ .create = tpm_passthrough_create,
+ .destroy = tpm_passthrough_destroy,
+ .init = tpm_passthrough_init,
+ .startup_tpm = tpm_passthrough_startup_tpm,
+ .realloc_buffer = tpm_passthrough_realloc_buffer,
+ .reset = tpm_passthrough_reset,
+ .had_startup_error = tpm_passthrough_get_startup_error,
+ .deliver_request = tpm_passthrough_deliver_request,
+ .cancel_cmd = tpm_passthrough_cancel_cmd,
+ .get_tpm_established_flag = tpm_passthrough_get_tpm_established_flag,
+};
+
+static void tpm_passthrough_register(void)
+{
+ tpm_register_driver(&tpm_passthrough_driver);
+}
+
+type_init(tpm_passthrough_register)