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-rw-r--r--hw/tpm/Makefile.objs2
-rw-r--r--hw/tpm/tpm_int.h6
-rw-r--r--hw/tpm/tpm_passthrough.c59
-rw-r--r--hw/tpm/tpm_util.c126
-rw-r--r--hw/tpm/tpm_util.h28
5 files changed, 167 insertions, 54 deletions
diff --git a/hw/tpm/Makefile.objs b/hw/tpm/Makefile.objs
index 99f5983..64cecc3 100644
--- a/hw/tpm/Makefile.objs
+++ b/hw/tpm/Makefile.objs
@@ -1,2 +1,2 @@
common-obj-$(CONFIG_TPM_TIS) += tpm_tis.o
-common-obj-$(CONFIG_TPM_PASSTHROUGH) += tpm_passthrough.o
+common-obj-$(CONFIG_TPM_PASSTHROUGH) += tpm_passthrough.o tpm_util.o
diff --git a/hw/tpm/tpm_int.h b/hw/tpm/tpm_int.h
index 9866c79..f2f285b 100644
--- a/hw/tpm/tpm_int.h
+++ b/hw/tpm/tpm_int.h
@@ -66,4 +66,10 @@ struct tpm_resp_hdr {
#define TPM_ORD_ContinueSelfTest 0x53
#define TPM_ORD_GetTicks 0xf1
+
+/* TPM2 defines */
+#define TPM2_ST_NO_SESSIONS 0x8001
+
+#define TPM2_CC_ReadClock 0x00000181
+
#endif /* TPM_TPM_INT_H */
diff --git a/hw/tpm/tpm_passthrough.c b/hw/tpm/tpm_passthrough.c
index f1361d2..8d8523a 100644
--- a/hw/tpm/tpm_passthrough.c
+++ b/hw/tpm/tpm_passthrough.c
@@ -33,6 +33,7 @@
#include "hw/i386/pc.h"
#include "sysemu/tpm_backend_int.h"
#include "tpm_tis.h"
+#include "tpm_util.h"
#define DEBUG_TPM 0
@@ -69,6 +70,8 @@ struct TPMPassthruState {
bool tpm_op_canceled;
int cancel_fd;
bool had_startup_error;
+
+ TPMVersion tpm_version;
};
typedef struct TPMPassthruState TPMPassthruState;
@@ -333,59 +336,9 @@ static const char *tpm_passthrough_create_desc(void)
static TPMVersion tpm_passthrough_get_tpm_version(TPMBackend *tb)
{
- return TPM_VERSION_1_2;
-}
-
-/*
- * 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;
- }
+ TPMPassthruState *tpm_pt = TPM_PASSTHROUGH(tb);
- return 0;
+ return tpm_pt->tpm_version;
}
/*
@@ -455,7 +408,7 @@ static int tpm_passthrough_handle_device_opts(QemuOpts *opts, TPMBackend *tb)
goto err_free_parameters;
}
- if (tpm_passthrough_test_tpmdev(tpm_pt->tpm_fd)) {
+ if (tpm_util_test_tpmdev(tpm_pt->tpm_fd, &tpm_pt->tpm_version)) {
error_report("'%s' is not a TPM device.",
tpm_pt->tpm_dev);
goto err_close_tpmdev;
diff --git a/hw/tpm/tpm_util.c b/hw/tpm/tpm_util.c
new file mode 100644
index 0000000..4ace585
--- /dev/null
+++ b/hw/tpm/tpm_util.c
@@ -0,0 +1,126 @@
+/*
+ * TPM utility functions
+ *
+ * Copyright (c) 2010 - 2015 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_util.h"
+#include "tpm_int.h"
+
+/*
+ * A basic test of a TPM device. We expect a well formatted response header
+ * (error response is fine) within one second.
+ */
+static int tpm_util_test(int fd,
+ unsigned char *request,
+ size_t requestlen,
+ uint16_t *return_tag)
+{
+ 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, request, requestlen);
+ if (n < 0) {
+ return errno;
+ }
+ if (n != requestlen) {
+ 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 (be32_to_cpu(resp->len) != n) {
+ return EBADMSG;
+ }
+
+ *return_tag = be16_to_cpu(resp->tag);
+
+ return 0;
+}
+
+/*
+ * Probe for the TPM device in the back
+ * Returns 0 on success with the version of the probed TPM set, 1 on failure.
+ */
+int tpm_util_test_tpmdev(int tpm_fd, TPMVersion *tpm_version)
+{
+ /*
+ * Sending a TPM1.2 command to a TPM2 should return a TPM1.2
+ * header (tag = 0xc4) and error code (TPM_BADTAG = 0x1e)
+ *
+ * Sending a TPM2 command to a TPM 2 will give a TPM 2 tag in the
+ * header.
+ * Sending a TPM2 command to a TPM 1.2 will give a TPM 1.2 tag
+ * in the header and an error code.
+ */
+ const struct tpm_req_hdr test_req = {
+ .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
+ .len = cpu_to_be32(sizeof(test_req)),
+ .ordinal = cpu_to_be32(TPM_ORD_GetTicks),
+ };
+
+ const struct tpm_req_hdr test_req_tpm2 = {
+ .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
+ .len = cpu_to_be32(sizeof(test_req_tpm2)),
+ .ordinal = cpu_to_be32(TPM2_CC_ReadClock),
+ };
+ uint16_t return_tag;
+ int ret;
+
+ /* Send TPM 2 command */
+ ret = tpm_util_test(tpm_fd, (unsigned char *)&test_req_tpm2,
+ sizeof(test_req_tpm2), &return_tag);
+ /* TPM 2 would respond with a tag of TPM2_ST_NO_SESSIONS */
+ if (!ret && return_tag == TPM2_ST_NO_SESSIONS) {
+ *tpm_version = TPM_VERSION_2_0;
+ return 0;
+ }
+
+ /* Send TPM 1.2 command */
+ ret = tpm_util_test(tpm_fd, (unsigned char *)&test_req,
+ sizeof(test_req), &return_tag);
+ if (!ret && return_tag == TPM_TAG_RSP_COMMAND) {
+ *tpm_version = TPM_VERSION_1_2;
+ /* this is a TPM 1.2 */
+ return 0;
+ }
+
+ *tpm_version = TPM_VERSION_UNSPEC;
+
+ return 1;
+}
diff --git a/hw/tpm/tpm_util.h b/hw/tpm/tpm_util.h
new file mode 100644
index 0000000..e7f354a
--- /dev/null
+++ b/hw/tpm/tpm_util.h
@@ -0,0 +1,28 @@
+/*
+ * TPM utility functions
+ *
+ * Copyright (c) 2010 - 2015 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_UTILS_H
+#define TPM_TPM_UTILS_H
+
+#include "sysemu/tpm_backend.h"
+
+int tpm_util_test_tpmdev(int tpm_fd, TPMVersion *tpm_version);
+
+#endif /* TPM_TPM_UTILS_H */
generated by cgit v1.1 at 2024-12-26 01:30:08 +0000