* [Qemu-devel] [PATCH v2 1/3] Extend TPM TIS interface to support TPM 2
2015-04-15 22:22 [Qemu-devel] [PATCH v2 0/3] tpm: Upgrade TPM TIS for support of a TPM 2 Stefan Berger
@ 2015-04-15 22:22 ` Stefan Berger
2015-04-15 22:22 ` [Qemu-devel] [PATCH v2 2/3] tpm: Probe for connected TPM 1.2 or " Stefan Berger
2015-04-15 22:22 ` [Qemu-devel] [PATCH v2 3/3] TPM2 ACPI table support Stefan Berger
2 siblings, 0 replies; 5+ messages in thread
From: Stefan Berger @ 2015-04-15 22:22 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Berger, quan.xu, mst
Following the recent upgrade to version 1.3, extend the TPM TIS
interface with capabilities introduced for support of a TPM 2.
TPM TIS for TPM 2 introduced the following extensions beyond the
TPM TIS 1.3 (used for TPM 1.2):
- A new 32bit interface Id register was introduced.
- New flags for the status (STS) register were defined.
- New flags for the capability flags were defined.
Support the above if a TPM TIS 1.3 for TPM 2 is used with a TPM 2
on the backend side. Support the old TPM TIS 1.3 configuration if a
TPM 1.2 is being used. A subsequent patch will then determine which
TPM version is being used in the backend.
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
---
v1->v2:
- fixed enums to be all upper case
- enum TPMVersion converted to typedef
---
backends/tpm.c | 14 ++++++
hw/tpm/tpm_int.h | 1 +
hw/tpm/tpm_passthrough.c | 14 ++++++
hw/tpm/tpm_tis.c | 109 +++++++++++++++++++++++++++++++++++++++----
hw/tpm/tpm_tis.h | 1 +
include/sysemu/tpm.h | 6 +++
include/sysemu/tpm_backend.h | 23 +++++++++
7 files changed, 159 insertions(+), 9 deletions(-)
diff --git a/backends/tpm.c b/backends/tpm.c
index 4efe367..9b0d0a5 100644
--- a/backends/tpm.c
+++ b/backends/tpm.c
@@ -96,6 +96,20 @@ bool tpm_backend_get_tpm_established_flag(TPMBackend *s)
return k->ops->get_tpm_established_flag(s);
}
+int tpm_backend_reset_tpm_established_flag(TPMBackend *s, uint8_t locty)
+{
+ TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
+
+ return k->ops->reset_tpm_established_flag(s, locty);
+}
+
+TPMVersion tpm_backend_get_tpm_version(TPMBackend *s)
+{
+ TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
+
+ return k->ops->get_tpm_version(s);
+}
+
static bool tpm_backend_prop_get_opened(Object *obj, Error **errp)
{
TPMBackend *s = TPM_BACKEND(obj);
diff --git a/hw/tpm/tpm_int.h b/hw/tpm/tpm_int.h
index 2b35fe2..9866c79 100644
--- a/hw/tpm/tpm_int.h
+++ b/hw/tpm/tpm_int.h
@@ -29,6 +29,7 @@ struct TPMState {
char *backend;
TPMBackend *be_driver;
+ TPMVersion be_tpm_version;
};
#define TPM(obj) OBJECT_CHECK(TPMState, (obj), TYPE_TPM_TIS)
diff --git a/hw/tpm/tpm_passthrough.c b/hw/tpm/tpm_passthrough.c
index 73ca906..f1361d2 100644
--- a/hw/tpm/tpm_passthrough.c
+++ b/hw/tpm/tpm_passthrough.c
@@ -267,6 +267,13 @@ static bool tpm_passthrough_get_tpm_established_flag(TPMBackend *tb)
return false;
}
+static int tpm_passthrough_reset_tpm_established_flag(TPMBackend *tb,
+ uint8_t locty)
+{
+ /* only a TPM 2.0 will support this */
+ return 0;
+}
+
static bool tpm_passthrough_get_startup_error(TPMBackend *tb)
{
TPMPassthruState *tpm_pt = TPM_PASSTHROUGH(tb);
@@ -324,6 +331,11 @@ static const char *tpm_passthrough_create_desc(void)
return "Passthrough TPM backend driver";
}
+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.
@@ -540,6 +552,8 @@ static const TPMDriverOps tpm_passthrough_driver = {
.deliver_request = tpm_passthrough_deliver_request,
.cancel_cmd = tpm_passthrough_cancel_cmd,
.get_tpm_established_flag = tpm_passthrough_get_tpm_established_flag,
+ .reset_tpm_established_flag = tpm_passthrough_reset_tpm_established_flag,
+ .get_tpm_version = tpm_passthrough_get_tpm_version,
};
static void tpm_passthrough_inst_init(Object *obj)
diff --git a/hw/tpm/tpm_tis.c b/hw/tpm/tpm_tis.c
index b8235d5..636e6d3 100644
--- a/hw/tpm/tpm_tis.c
+++ b/hw/tpm/tpm_tis.c
@@ -17,6 +17,9 @@
* supports version 1.3, 21 March 2013
* In the developers menu choose the PC Client section then find the TIS
* specification.
+ *
+ * TPM TIS for TPM 2 implementation following TCG PC Client Platform
+ * TPM Profile (PTP) Specification, Familiy 2.0, Revision 00.43
*/
#include "sysemu/tpm_backend.h"
@@ -49,6 +52,7 @@
#define TPM_TIS_REG_INTF_CAPABILITY 0x14
#define TPM_TIS_REG_STS 0x18
#define TPM_TIS_REG_DATA_FIFO 0x24
+#define TPM_TIS_REG_INTERFACE_ID 0x30
#define TPM_TIS_REG_DATA_XFIFO 0x80
#define TPM_TIS_REG_DATA_XFIFO_END 0xbc
#define TPM_TIS_REG_DID_VID 0xf00
@@ -57,6 +61,12 @@
/* vendor-specific registers */
#define TPM_TIS_REG_DEBUG 0xf90
+#define TPM_TIS_STS_TPM_FAMILY_MASK (0x3 << 26)/* TPM 2.0 */
+#define TPM_TIS_STS_TPM_FAMILY1_2 (0 << 26) /* TPM 2.0 */
+#define TPM_TIS_STS_TPM_FAMILY2_0 (1 << 26) /* TPM 2.0 */
+#define TPM_TIS_STS_RESET_ESTABLISHMENT_BIT (1 << 25) /* TPM 2.0 */
+#define TPM_TIS_STS_COMMAND_CANCEL (1 << 24) /* TPM 2.0 */
+
#define TPM_TIS_STS_VALID (1 << 7)
#define TPM_TIS_STS_COMMAND_READY (1 << 6)
#define TPM_TIS_STS_TPM_GO (1 << 5)
@@ -102,15 +112,42 @@
#endif
#define TPM_TIS_CAP_INTERFACE_VERSION1_3 (2 << 28)
+#define TPM_TIS_CAP_INTERFACE_VERSION1_3_FOR_TPM2_0 (3 << 28)
#define TPM_TIS_CAP_DATA_TRANSFER_64B (3 << 9)
#define TPM_TIS_CAP_DATA_TRANSFER_LEGACY (0 << 9)
#define TPM_TIS_CAP_BURST_COUNT_DYNAMIC (0 << 8)
#define TPM_TIS_CAP_INTERRUPT_LOW_LEVEL (1 << 4) /* support is mandatory */
-#define TPM_TIS_CAPABILITIES_SUPPORTED (TPM_TIS_CAP_INTERRUPT_LOW_LEVEL | \
- TPM_TIS_CAP_BURST_COUNT_DYNAMIC | \
- TPM_TIS_CAP_DATA_TRANSFER_64B | \
- TPM_TIS_CAP_INTERFACE_VERSION1_3 | \
- TPM_TIS_INTERRUPTS_SUPPORTED)
+#define TPM_TIS_CAPABILITIES_SUPPORTED1_3 \
+ (TPM_TIS_CAP_INTERRUPT_LOW_LEVEL | \
+ TPM_TIS_CAP_BURST_COUNT_DYNAMIC | \
+ TPM_TIS_CAP_DATA_TRANSFER_64B | \
+ TPM_TIS_CAP_INTERFACE_VERSION1_3 | \
+ TPM_TIS_INTERRUPTS_SUPPORTED)
+
+#define TPM_TIS_CAPABILITIES_SUPPORTED2_0 \
+ (TPM_TIS_CAP_INTERRUPT_LOW_LEVEL | \
+ TPM_TIS_CAP_BURST_COUNT_DYNAMIC | \
+ TPM_TIS_CAP_DATA_TRANSFER_64B | \
+ TPM_TIS_CAP_INTERFACE_VERSION1_3_FOR_TPM2_0 | \
+ TPM_TIS_INTERRUPTS_SUPPORTED)
+
+#define TPM_TIS_IFACE_ID_INTERFACE_TIS1_3 (0xf) /* TPM 2.0 */
+#define TPM_TIS_IFACE_ID_INTERFACE_FIFO (0x0) /* TPM 2.0 */
+#define TPM_TIS_IFACE_ID_INTERFACE_VER_FIFO (0 << 4) /* TPM 2.0 */
+#define TPM_TIS_IFACE_ID_CAP_5_LOCALITIES (1 << 8) /* TPM 2.0 */
+#define TPM_TIS_IFACE_ID_CAP_TIS_SUPPORTED (1 << 13) /* TPM 2.0 */
+#define TPM_TIS_IFACE_ID_INT_SEL_LOCK (1 << 19) /* TPM 2.0 */
+
+#define TPM_TIS_IFACE_ID_SUPPORTED_FLAGS1_3 \
+ (TPM_TIS_IFACE_ID_INTERFACE_TIS1_3 | \
+ (~0 << 4)/* all of it is don't care */)
+
+/* if backend was a TPM 2.0: */
+#define TPM_TIS_IFACE_ID_SUPPORTED_FLAGS2_0 \
+ (TPM_TIS_IFACE_ID_INTERFACE_FIFO | \
+ TPM_TIS_IFACE_ID_INTERFACE_VER_FIFO | \
+ TPM_TIS_IFACE_ID_CAP_5_LOCALITIES | \
+ TPM_TIS_IFACE_ID_CAP_TIS_SUPPORTED)
#define TPM_TIS_TPM_DID 0x0001
#define TPM_TIS_TPM_VID PCI_VENDOR_ID_IBM
@@ -154,7 +191,8 @@ static void tpm_tis_show_buffer(const TPMSizedBuffer *sb, const char *string)
/*
* Set the given flags in the STS register by clearing the register but
- * preserving the SELFTEST_DONE flag and then setting the new flags.
+ * preserving the SELFTEST_DONE and TPM_FAMILY_MASK flags and then setting
+ * the new flags.
*
* The SELFTEST_DONE flag is acquired from the backend that determines it by
* peeking into TPM commands.
@@ -166,7 +204,7 @@ static void tpm_tis_show_buffer(const TPMSizedBuffer *sb, const char *string)
*/
static void tpm_tis_sts_set(TPMLocality *l, uint32_t flags)
{
- l->sts &= TPM_TIS_STS_SELFTEST_DONE;
+ l->sts &= TPM_TIS_STS_SELFTEST_DONE | TPM_TIS_STS_TPM_FAMILY_MASK;
l->sts |= flags;
}
@@ -489,7 +527,17 @@ static uint64_t tpm_tis_mmio_read(void *opaque, hwaddr addr,
val = tis->loc[locty].ints;
break;
case TPM_TIS_REG_INTF_CAPABILITY:
- val = TPM_TIS_CAPABILITIES_SUPPORTED;
+ switch (s->be_tpm_version) {
+ case TPM_VERSION_UNSPEC:
+ val = 0;
+ break;
+ case TPM_VERSION_1_2:
+ val = TPM_TIS_CAPABILITIES_SUPPORTED1_3;
+ break;
+ case TPM_VERSION_2_0:
+ val = TPM_TIS_CAPABILITIES_SUPPORTED2_0;
+ break;
+ }
break;
case TPM_TIS_REG_STS:
if (tis->active_locty == locty) {
@@ -536,6 +584,9 @@ static uint64_t tpm_tis_mmio_read(void *opaque, hwaddr addr,
shift = 0; /* no more adjustments */
}
break;
+ case TPM_TIS_REG_INTERFACE_ID:
+ val = tis->loc[locty].iface_id;
+ break;
case TPM_TIS_REG_DID_VID:
val = (TPM_TIS_TPM_DID << 16) | TPM_TIS_TPM_VID;
break;
@@ -736,6 +787,25 @@ static void tpm_tis_mmio_write_intern(void *opaque, hwaddr addr,
break;
}
+ if (s->be_tpm_version == TPM_VERSION_2_0) {
+ /* some flags that are only supported for TPM 2 */
+ if (val & TPM_TIS_STS_COMMAND_CANCEL) {
+ if (tis->loc[locty].state == TPM_TIS_STATE_EXECUTION) {
+ /*
+ * request the backend to cancel. Some backends may not
+ * support it
+ */
+ tpm_backend_cancel_cmd(s->be_driver);
+ }
+ }
+
+ if (val & TPM_TIS_STS_RESET_ESTABLISHMENT_BIT) {
+ if (locty == 3 || locty == 4) {
+ tpm_backend_reset_tpm_established_flag(s->be_driver, locty);
+ }
+ }
+ }
+
val &= (TPM_TIS_STS_COMMAND_READY | TPM_TIS_STS_TPM_GO |
TPM_TIS_STS_RESPONSE_RETRY);
@@ -860,6 +930,14 @@ static void tpm_tis_mmio_write_intern(void *opaque, hwaddr addr,
}
}
break;
+ case TPM_TIS_REG_INTERFACE_ID:
+ if (val & TPM_TIS_IFACE_ID_INT_SEL_LOCK) {
+ for (l = 0; l < TPM_TIS_NUM_LOCALITIES; l++) {
+ tis->loc[l].iface_id |= TPM_TIS_IFACE_ID_INT_SEL_LOCK;
+ }
+ }
+
+ break;
}
}
@@ -894,6 +972,8 @@ static void tpm_tis_reset(DeviceState *dev)
TPMTISEmuState *tis = &s->s.tis;
int c;
+ s->be_tpm_version = tpm_backend_get_tpm_version(s->be_driver);
+
tpm_backend_reset(s->be_driver);
tis->active_locty = TPM_TIS_NO_LOCALITY;
@@ -902,7 +982,18 @@ static void tpm_tis_reset(DeviceState *dev)
for (c = 0; c < TPM_TIS_NUM_LOCALITIES; c++) {
tis->loc[c].access = TPM_TIS_ACCESS_TPM_REG_VALID_STS;
- tis->loc[c].sts = 0;
+ switch (s->be_tpm_version) {
+ case TPM_VERSION_UNSPEC:
+ break;
+ case TPM_VERSION_1_2:
+ tis->loc[c].sts = TPM_TIS_STS_TPM_FAMILY1_2;
+ tis->loc[c].iface_id = TPM_TIS_IFACE_ID_SUPPORTED_FLAGS1_3;
+ break;
+ case TPM_VERSION_2_0:
+ tis->loc[c].sts = TPM_TIS_STS_TPM_FAMILY2_0;
+ tis->loc[c].iface_id = TPM_TIS_IFACE_ID_SUPPORTED_FLAGS2_0;
+ break;
+ }
tis->loc[c].inte = TPM_TIS_INT_POLARITY_LOW_LEVEL;
tis->loc[c].ints = 0;
tis->loc[c].state = TPM_TIS_STATE_IDLE;
diff --git a/hw/tpm/tpm_tis.h b/hw/tpm/tpm_tis.h
index db78d51..a1df41f 100644
--- a/hw/tpm/tpm_tis.h
+++ b/hw/tpm/tpm_tis.h
@@ -42,6 +42,7 @@ typedef struct TPMLocality {
TPMTISState state;
uint8_t access;
uint32_t sts;
+ uint32_t iface_id;
uint32_t inte;
uint32_t ints;
diff --git a/include/sysemu/tpm.h b/include/sysemu/tpm.h
index 9b81ce9..848df41 100644
--- a/include/sysemu/tpm.h
+++ b/include/sysemu/tpm.h
@@ -20,6 +20,12 @@ int tpm_config_parse(QemuOptsList *opts_list, const char *optarg);
int tpm_init(void);
void tpm_cleanup(void);
+typedef enum TPMVersion {
+ TPM_VERSION_UNSPEC = 0,
+ TPM_VERSION_1_2 = 1,
+ TPM_VERSION_2_0 = 2,
+} TPMVersion;
+
#define TYPE_TPM_TIS "tpm-tis"
static inline bool tpm_find(void)
diff --git a/include/sysemu/tpm_backend.h b/include/sysemu/tpm_backend.h
index 540ee25..0a366be 100644
--- a/include/sysemu/tpm_backend.h
+++ b/include/sysemu/tpm_backend.h
@@ -88,6 +88,10 @@ struct TPMDriverOps {
void (*cancel_cmd)(TPMBackend *t);
bool (*get_tpm_established_flag)(TPMBackend *t);
+
+ int (*reset_tpm_established_flag)(TPMBackend *t, uint8_t locty);
+
+ TPMVersion (*get_tpm_version)(TPMBackend *t);
};
@@ -192,6 +196,15 @@ void tpm_backend_cancel_cmd(TPMBackend *s);
bool tpm_backend_get_tpm_established_flag(TPMBackend *s);
/**
+ * tpm_backend_reset_tpm_established_flag:
+ * @s: the backend
+ * @locty: the locality number
+ *
+ * Reset the TPM establishment flag.
+ */
+int tpm_backend_reset_tpm_established_flag(TPMBackend *s, uint8_t locty);
+
+/**
* tpm_backend_open:
* @s: the backend to open
* @errp: a pointer to return the #Error object if an error occurs.
@@ -201,6 +214,16 @@ bool tpm_backend_get_tpm_established_flag(TPMBackend *s);
*/
void tpm_backend_open(TPMBackend *s, Error **errp);
+/**
+ * tpm_backend_get_tpm_version:
+ * @s: the backend to call into
+ *
+ * Get the TPM Version that is emulated at the backend.
+ *
+ * Returns TPMVersion.
+ */
+TPMVersion tpm_backend_get_tpm_version(TPMBackend *s);
+
TPMBackend *qemu_find_tpm(const char *id);
const TPMDriverOps *tpm_get_backend_driver(const char *type);
--
1.9.3
^ permalink raw reply related [flat|nested] 5+ messages in thread* [Qemu-devel] [PATCH v2 2/3] tpm: Probe for connected TPM 1.2 or TPM 2
2015-04-15 22:22 [Qemu-devel] [PATCH v2 0/3] tpm: Upgrade TPM TIS for support of a TPM 2 Stefan Berger
2015-04-15 22:22 ` [Qemu-devel] [PATCH v2 1/3] Extend TPM TIS interface to support " Stefan Berger
@ 2015-04-15 22:22 ` Stefan Berger
2015-04-15 22:22 ` [Qemu-devel] [PATCH v2 3/3] TPM2 ACPI table support Stefan Berger
2 siblings, 0 replies; 5+ messages in thread
From: Stefan Berger @ 2015-04-15 22:22 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Berger, quan.xu, mst
In the TPM passthrough backend driver, modify the probing code so
that we can check whether a TPM 1.2 or TPM 2 is being used
and adapt the behavior of the TPM TIS accordingly.
Move the code that tested for a TPM 1.2 into tpm_utils.c
and extend it with test for probing for TPM 2. Have the
function return the version of TPM found.
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
---
v1->v2:
- prefixed TPM 2 #define's with TPM2
---
hw/tpm/Makefile.objs | 2 +-
hw/tpm/tpm_int.h | 6 +++
hw/tpm/tpm_passthrough.c | 59 +++-------------------
hw/tpm/tpm_util.c | 126 +++++++++++++++++++++++++++++++++++++++++++++++
hw/tpm/tpm_util.h | 28 +++++++++++
5 files changed, 167 insertions(+), 54 deletions(-)
create mode 100644 hw/tpm/tpm_util.c
create mode 100644 hw/tpm/tpm_util.h
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 */
--
1.9.3
^ permalink raw reply related [flat|nested] 5+ messages in thread* [Qemu-devel] [PATCH v2 3/3] TPM2 ACPI table support
2015-04-15 22:22 [Qemu-devel] [PATCH v2 0/3] tpm: Upgrade TPM TIS for support of a TPM 2 Stefan Berger
2015-04-15 22:22 ` [Qemu-devel] [PATCH v2 1/3] Extend TPM TIS interface to support " Stefan Berger
2015-04-15 22:22 ` [Qemu-devel] [PATCH v2 2/3] tpm: Probe for connected TPM 1.2 or " Stefan Berger
@ 2015-04-15 22:22 ` Stefan Berger
2 siblings, 0 replies; 5+ messages in thread
From: Stefan Berger @ 2015-04-15 22:22 UTC (permalink / raw)
To: qemu-devel; +Cc: Stefan Berger, quan.xu, mst
Add a TPM2 ACPI table if a TPM 2 is used in the backend.
Rename tpm_find() to tpm_get_version() and have this function
return the version of the TPM found, TPMVersion_Unspec if
no TPM is found. Use the version number to build version
specific ACPI tables.
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
---
hw/i386/acpi-build.c | 34 ++++++++++++++++++++++++++++++----
hw/i386/acpi-defs.h | 18 ++++++++++++++++++
hw/tpm/tpm_tis.c | 11 +++++++++++
include/hw/acpi/tpm.h | 5 +++++
include/sysemu/tpm.h | 11 +++++++++--
5 files changed, 73 insertions(+), 6 deletions(-)
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index e761005..fa64646 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -42,6 +42,7 @@
#include "hw/acpi/memory_hotplug.h"
#include "sysemu/tpm.h"
#include "hw/acpi/tpm.h"
+#include "sysemu/tpm_backend.h"
/* Supported chipsets: */
#include "hw/acpi/piix4.h"
@@ -111,7 +112,7 @@ typedef struct AcpiPmInfo {
typedef struct AcpiMiscInfo {
bool has_hpet;
- bool has_tpm;
+ TPMVersion tpm_version;
const unsigned char *dsdt_code;
unsigned dsdt_size;
uint16_t pvpanic_port;
@@ -239,7 +240,7 @@ static void acpi_get_pm_info(AcpiPmInfo *pm)
static void acpi_get_misc_info(AcpiMiscInfo *info)
{
info->has_hpet = hpet_find();
- info->has_tpm = tpm_find();
+ info->tpm_version = tpm_get_version();
info->pvpanic_port = pvpanic_port();
info->applesmc_io_base = applesmc_port();
}
@@ -1065,6 +1066,21 @@ build_tpm_ssdt(GArray *table_data, GArray *linker)
memcpy(tpm_ptr, ssdt_tpm_aml, sizeof(ssdt_tpm_aml));
}
+static void
+build_tpm2(GArray *table_data, GArray *linker)
+{
+ Acpi20TPM2 *tpm2_ptr;
+
+ tpm2_ptr = acpi_data_push(table_data, sizeof *tpm2_ptr);
+
+ tpm2_ptr->platform_class = cpu_to_le16(TPM2_ACPI_CLASS_CLIENT);
+ tpm2_ptr->control_area_address = cpu_to_le64(0);
+ tpm2_ptr->start_method = cpu_to_le32(TPM2_START_METHOD_MMIO);
+
+ build_header(linker, table_data,
+ (void *)tpm2_ptr, "TPM2", sizeof(*tpm2_ptr), 4);
+}
+
typedef enum {
MEM_AFFINITY_NOFLAGS = 0,
MEM_AFFINITY_ENABLED = (1 << 0),
@@ -1428,12 +1444,22 @@ void acpi_build(PcGuestInfo *guest_info, AcpiBuildTables *tables)
acpi_add_table(table_offsets, tables_blob);
build_hpet(tables_blob, tables->linker);
}
- if (misc.has_tpm) {
+ if (misc.tpm_version != TPM_VERSION_UNSPEC) {
acpi_add_table(table_offsets, tables_blob);
build_tpm_tcpa(tables_blob, tables->linker, tables->tcpalog);
acpi_add_table(table_offsets, tables_blob);
- build_tpm_ssdt(tables_blob, tables->linker);
+ switch (misc.tpm_version) {
+ case TPM_VERSION_1_2:
+ build_tpm_ssdt(tables_blob, tables->linker);
+ break;
+ case TPM_VERSION_2_0:
+ build_tpm2(tables_blob, tables->linker);
+ break;
+ case TPM_VERSION_UNSPEC:
+ /* not possible */
+ break;
+ }
}
if (guest_info->numa_nodes) {
acpi_add_table(table_offsets, tables_blob);
diff --git a/hw/i386/acpi-defs.h b/hw/i386/acpi-defs.h
index c4468f8..79ee9b1 100644
--- a/hw/i386/acpi-defs.h
+++ b/hw/i386/acpi-defs.h
@@ -316,6 +316,9 @@ typedef struct AcpiTableMcfg AcpiTableMcfg;
/*
* TCPA Description Table
+ *
+ * Following Level 00, Rev 00.37 of specs:
+ * http://www.trustedcomputinggroup.org/resources/tcg_acpi_specification
*/
struct Acpi20Tcpa {
ACPI_TABLE_HEADER_DEF /* ACPI common table header */
@@ -325,6 +328,21 @@ struct Acpi20Tcpa {
} QEMU_PACKED;
typedef struct Acpi20Tcpa Acpi20Tcpa;
+/*
+ * TPM2
+ *
+ * Following Level 00, Rev 00.37 of specs:
+ * http://www.trustedcomputinggroup.org/resources/tcg_acpi_specification
+ */
+struct Acpi20TPM2 {
+ ACPI_TABLE_HEADER_DEF
+ uint16_t platform_class;
+ uint16_t reserved;
+ uint64_t control_area_address;
+ uint32_t start_method;
+} QEMU_PACKED;
+typedef struct Acpi20TPM2 Acpi20TPM2;
+
/* DMAR - DMA Remapping table r2.2 */
struct AcpiTableDmar {
ACPI_TABLE_HEADER_DEF
diff --git a/hw/tpm/tpm_tis.c b/hw/tpm/tpm_tis.c
index 636e6d3..be7e61f 100644
--- a/hw/tpm/tpm_tis.c
+++ b/hw/tpm/tpm_tis.c
@@ -32,6 +32,7 @@
#include "tpm_tis.h"
#include "qemu-common.h"
#include "qemu/main-loop.h"
+#include "sysemu/tpm_backend.h"
#define DEBUG_TIS 0
@@ -963,6 +964,16 @@ static int tpm_tis_do_startup_tpm(TPMState *s)
}
/*
+ * Get the TPMVersion of the backend device being used
+ */
+TPMVersion tpm_tis_get_tpm_version(Object *obj)
+{
+ TPMState *s = TPM(obj);
+
+ return tpm_backend_get_tpm_version(s->be_driver);
+}
+
+/*
* This function is called when the machine starts, resets or due to
* S3 resume.
*/
diff --git a/include/hw/acpi/tpm.h b/include/hw/acpi/tpm.h
index 792fcbf..6d516c6 100644
--- a/include/hw/acpi/tpm.h
+++ b/include/hw/acpi/tpm.h
@@ -26,4 +26,9 @@
#define TPM_TCPA_ACPI_CLASS_CLIENT 0
#define TPM_TCPA_ACPI_CLASS_SERVER 1
+#define TPM2_ACPI_CLASS_CLIENT 0
+#define TPM2_ACPI_CLASS_SERVER 1
+
+#define TPM2_START_METHOD_MMIO 6
+
#endif /* HW_ACPI_TPM_H */
diff --git a/include/sysemu/tpm.h b/include/sysemu/tpm.h
index 848df41..c143890 100644
--- a/include/sysemu/tpm.h
+++ b/include/sysemu/tpm.h
@@ -26,11 +26,18 @@ typedef enum TPMVersion {
TPM_VERSION_2_0 = 2,
} TPMVersion;
+TPMVersion tpm_tis_get_tpm_version(Object *obj);
+
#define TYPE_TPM_TIS "tpm-tis"
-static inline bool tpm_find(void)
+static inline TPMVersion tpm_get_version(void)
{
- return object_resolve_path_type("", TYPE_TPM_TIS, NULL);
+ Object *obj = object_resolve_path_type("", TYPE_TPM_TIS, NULL);
+
+ if (obj) {
+ return tpm_tis_get_tpm_version(obj);
+ }
+ return TPM_VERSION_UNSPEC;
}
#endif /* QEMU_TPM_H */
--
1.9.3
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [Qemu-devel] [PATCH v2 2/3] tpm: Probe for connected TPM 1.2 or TPM 2
2015-05-01 2:44 [Qemu-devel] [PATCH v2 0/3] tpm: Upgrade TPM TIS for support of a TPM 2 Stefan Berger
@ 2015-05-01 2:44 ` Stefan Berger
0 siblings, 0 replies; 5+ messages in thread
From: Stefan Berger @ 2015-05-01 2:44 UTC (permalink / raw)
To: mst, qemu-devel; +Cc: quan.xu, Stefan Berger
In the TPM passthrough backend driver, modify the probing code so
that we can check whether a TPM 1.2 or TPM 2 is being used
and adapt the behavior of the TPM TIS accordingly.
Move the code that tested for a TPM 1.2 into tpm_utils.c
and extend it with test for probing for TPM 2. Have the
function return the version of TPM found.
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
---
v1->v2:
- prefixed TPM 2 #define's with TPM2
---
hw/tpm/Makefile.objs | 2 +-
hw/tpm/tpm_int.h | 6 +++
hw/tpm/tpm_passthrough.c | 59 +++-------------------
hw/tpm/tpm_util.c | 126 +++++++++++++++++++++++++++++++++++++++++++++++
hw/tpm/tpm_util.h | 28 +++++++++++
5 files changed, 167 insertions(+), 54 deletions(-)
create mode 100644 hw/tpm/tpm_util.c
create mode 100644 hw/tpm/tpm_util.h
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 */
--
1.9.3
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