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authorStefan Berger <stefanb@linux.vnet.ibm.com>2020-01-21 10:29:32 -0500
committerDavid Gibson <david@gibson.dropbear.id.au>2020-02-02 14:07:57 +1100
commit3676bc69b358d84a6b32d9cd44325048659a32a2 (patch)
tree0116c4e50ee6e48cbafe9cd07d3ba2e6b66d9d9b /hw
parent864674fa29ab61681b8c72c3c41251e985daabed (diff)
tpm_spapr: Support TPM for ppc64 using CRQ based interface
Implement support for TPM on ppc64 by implementing the vTPM CRQ interface as a frontend. It can use the tpm_emulator driver backend with the external swtpm. The Linux vTPM driver for ppc64 works with this emulation. This TPM emulator also handles the TPM 2 case. Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Message-Id: <20200121152935.649898-4-stefanb@linux.ibm.com> [dwg: Use device_class_set_props(), tweak Kconfig] Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'hw')
-rw-r--r--hw/tpm/Kconfig6
-rw-r--r--hw/tpm/Makefile.objs1
-rw-r--r--hw/tpm/tpm_spapr.c379
-rw-r--r--hw/tpm/trace-events12
4 files changed, 398 insertions, 0 deletions
diff --git a/hw/tpm/Kconfig b/hw/tpm/Kconfig
index 4c8ee87d67..4d4ab0855c 100644
--- a/hw/tpm/Kconfig
+++ b/hw/tpm/Kconfig
@@ -22,3 +22,9 @@ config TPM_EMULATOR
bool
default y
depends on TPMDEV
+
+config TPM_SPAPR
+ bool
+ default n
+ depends on TPM && PSERIES
+ select TPMDEV
diff --git a/hw/tpm/Makefile.objs b/hw/tpm/Makefile.objs
index de0b85d02a..85eb99ae05 100644
--- a/hw/tpm/Makefile.objs
+++ b/hw/tpm/Makefile.objs
@@ -4,3 +4,4 @@ common-obj-$(CONFIG_TPM_TIS) += tpm_tis.o
common-obj-$(CONFIG_TPM_CRB) += tpm_crb.o
common-obj-$(CONFIG_TPM_PASSTHROUGH) += tpm_passthrough.o
common-obj-$(CONFIG_TPM_EMULATOR) += tpm_emulator.o
+obj-$(CONFIG_TPM_SPAPR) += tpm_spapr.o
diff --git a/hw/tpm/tpm_spapr.c b/hw/tpm/tpm_spapr.c
new file mode 100644
index 0000000000..2ac4cb061c
--- /dev/null
+++ b/hw/tpm/tpm_spapr.c
@@ -0,0 +1,379 @@
+/*
+ * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
+ *
+ * PAPR Virtual TPM
+ *
+ * Copyright (c) 2015, 2017, 2019 IBM Corporation.
+ *
+ * Authors:
+ * Stefan Berger <stefanb@linux.vnet.ibm.com>
+ *
+ * This code is licensed under the GPL version 2 or later. See the
+ * COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/error-report.h"
+#include "qapi/error.h"
+#include "hw/qdev-properties.h"
+#include "migration/vmstate.h"
+
+#include "sysemu/tpm_backend.h"
+#include "tpm_int.h"
+#include "tpm_util.h"
+
+#include "hw/ppc/spapr.h"
+#include "hw/ppc/spapr_vio.h"
+#include "trace.h"
+
+#define DEBUG_SPAPR 0
+
+#define VIO_SPAPR_VTPM(obj) \
+ OBJECT_CHECK(SpaprTpmState, (obj), TYPE_TPM_SPAPR)
+
+typedef struct TpmCrq {
+ uint8_t valid; /* 0x80: cmd; 0xc0: init crq */
+ /* 0x81-0x83: CRQ message response */
+ uint8_t msg; /* see below */
+ uint16_t len; /* len of TPM request; len of TPM response */
+ uint32_t data; /* rtce_dma_handle when sending TPM request */
+ uint64_t reserved;
+} TpmCrq;
+
+#define SPAPR_VTPM_VALID_INIT_CRQ_COMMAND 0xC0
+#define SPAPR_VTPM_VALID_COMMAND 0x80
+#define SPAPR_VTPM_MSG_RESULT 0x80
+
+/* msg types for valid = SPAPR_VTPM_VALID_INIT_CRQ */
+#define SPAPR_VTPM_INIT_CRQ_RESULT 0x1
+#define SPAPR_VTPM_INIT_CRQ_COMPLETE_RESULT 0x2
+
+/* msg types for valid = SPAPR_VTPM_VALID_CMD */
+#define SPAPR_VTPM_GET_VERSION 0x1
+#define SPAPR_VTPM_TPM_COMMAND 0x2
+#define SPAPR_VTPM_GET_RTCE_BUFFER_SIZE 0x3
+#define SPAPR_VTPM_PREPARE_TO_SUSPEND 0x4
+
+/* response error messages */
+#define SPAPR_VTPM_VTPM_ERROR 0xff
+
+/* error codes */
+#define SPAPR_VTPM_ERR_COPY_IN_FAILED 0x3
+#define SPAPR_VTPM_ERR_COPY_OUT_FAILED 0x4
+
+#define TPM_SPAPR_BUFFER_MAX 4096
+
+typedef struct {
+ SpaprVioDevice vdev;
+
+ TpmCrq crq; /* track single TPM command */
+
+ uint8_t state;
+#define SPAPR_VTPM_STATE_NONE 0
+#define SPAPR_VTPM_STATE_EXECUTION 1
+#define SPAPR_VTPM_STATE_COMPLETION 2
+
+ unsigned char *buffer;
+
+ TPMBackendCmd cmd;
+
+ TPMBackend *be_driver;
+ TPMVersion be_tpm_version;
+
+ size_t be_buffer_size;
+} SpaprTpmState;
+
+/*
+ * Send a request to the TPM.
+ */
+static void tpm_spapr_tpm_send(SpaprTpmState *s)
+{
+ if (trace_event_get_state_backends(TRACE_TPM_SPAPR_SHOW_BUFFER)) {
+ tpm_util_show_buffer(s->buffer, s->be_buffer_size, "To TPM");
+ }
+
+ s->state = SPAPR_VTPM_STATE_EXECUTION;
+ s->cmd = (TPMBackendCmd) {
+ .locty = 0,
+ .in = s->buffer,
+ .in_len = MIN(tpm_cmd_get_size(s->buffer), s->be_buffer_size),
+ .out = s->buffer,
+ .out_len = s->be_buffer_size,
+ };
+
+ tpm_backend_deliver_request(s->be_driver, &s->cmd);
+}
+
+static int tpm_spapr_process_cmd(SpaprTpmState *s, uint64_t dataptr)
+{
+ long rc;
+
+ /* a max. of be_buffer_size bytes can be transported */
+ rc = spapr_vio_dma_read(&s->vdev, dataptr,
+ s->buffer, s->be_buffer_size);
+ if (rc) {
+ error_report("tpm_spapr_got_payload: DMA read failure");
+ }
+ /* let vTPM handle any malformed request */
+ tpm_spapr_tpm_send(s);
+
+ return rc;
+}
+
+static inline int spapr_tpm_send_crq(struct SpaprVioDevice *dev, TpmCrq *crq)
+{
+ return spapr_vio_send_crq(dev, (uint8_t *)crq);
+}
+
+static int tpm_spapr_do_crq(struct SpaprVioDevice *dev, uint8_t *crq_data)
+{
+ SpaprTpmState *s = VIO_SPAPR_VTPM(dev);
+ TpmCrq local_crq;
+ TpmCrq *crq = &s->crq; /* requests only */
+ int rc;
+ uint8_t valid = crq_data[0];
+ uint8_t msg = crq_data[1];
+
+ trace_tpm_spapr_do_crq(valid, msg);
+
+ switch (valid) {
+ case SPAPR_VTPM_VALID_INIT_CRQ_COMMAND: /* Init command/response */
+
+ /* Respond to initialization request */
+ switch (msg) {
+ case SPAPR_VTPM_INIT_CRQ_RESULT:
+ trace_tpm_spapr_do_crq_crq_result();
+ memset(&local_crq, 0, sizeof(local_crq));
+ local_crq.valid = SPAPR_VTPM_VALID_INIT_CRQ_COMMAND;
+ local_crq.msg = SPAPR_VTPM_INIT_CRQ_RESULT;
+ spapr_tpm_send_crq(dev, &local_crq);
+ break;
+
+ case SPAPR_VTPM_INIT_CRQ_COMPLETE_RESULT:
+ trace_tpm_spapr_do_crq_crq_complete_result();
+ memset(&local_crq, 0, sizeof(local_crq));
+ local_crq.valid = SPAPR_VTPM_VALID_INIT_CRQ_COMMAND;
+ local_crq.msg = SPAPR_VTPM_INIT_CRQ_COMPLETE_RESULT;
+ spapr_tpm_send_crq(dev, &local_crq);
+ break;
+ }
+
+ break;
+ case SPAPR_VTPM_VALID_COMMAND: /* Payloads */
+ switch (msg) {
+ case SPAPR_VTPM_TPM_COMMAND:
+ trace_tpm_spapr_do_crq_tpm_command();
+ if (s->state == SPAPR_VTPM_STATE_EXECUTION) {
+ return H_BUSY;
+ }
+ memcpy(crq, crq_data, sizeof(*crq));
+
+ rc = tpm_spapr_process_cmd(s, be32_to_cpu(crq->data));
+
+ if (rc == H_SUCCESS) {
+ crq->valid = be16_to_cpu(0);
+ } else {
+ local_crq.valid = SPAPR_VTPM_MSG_RESULT;
+ local_crq.msg = SPAPR_VTPM_VTPM_ERROR;
+ local_crq.len = cpu_to_be16(0);
+ local_crq.data = cpu_to_be32(SPAPR_VTPM_ERR_COPY_IN_FAILED);
+ spapr_tpm_send_crq(dev, &local_crq);
+ }
+ break;
+
+ case SPAPR_VTPM_GET_RTCE_BUFFER_SIZE:
+ trace_tpm_spapr_do_crq_tpm_get_rtce_buffer_size(s->be_buffer_size);
+ local_crq.valid = SPAPR_VTPM_VALID_COMMAND;
+ local_crq.msg = SPAPR_VTPM_GET_RTCE_BUFFER_SIZE |
+ SPAPR_VTPM_MSG_RESULT;
+ local_crq.len = cpu_to_be16(s->be_buffer_size);
+ spapr_tpm_send_crq(dev, &local_crq);
+ break;
+
+ case SPAPR_VTPM_GET_VERSION:
+ local_crq.valid = SPAPR_VTPM_VALID_COMMAND;
+ local_crq.msg = SPAPR_VTPM_GET_VERSION | SPAPR_VTPM_MSG_RESULT;
+ local_crq.len = cpu_to_be16(0);
+ switch (s->be_tpm_version) {
+ case TPM_VERSION_1_2:
+ local_crq.data = cpu_to_be32(1);
+ break;
+ case TPM_VERSION_2_0:
+ local_crq.data = cpu_to_be32(2);
+ break;
+ default:
+ g_assert_not_reached();
+ break;
+ }
+ trace_tpm_spapr_do_crq_get_version(be32_to_cpu(local_crq.data));
+ spapr_tpm_send_crq(dev, &local_crq);
+ break;
+
+ case SPAPR_VTPM_PREPARE_TO_SUSPEND:
+ trace_tpm_spapr_do_crq_prepare_to_suspend();
+ local_crq.valid = SPAPR_VTPM_VALID_COMMAND;
+ local_crq.msg = SPAPR_VTPM_PREPARE_TO_SUSPEND |
+ SPAPR_VTPM_MSG_RESULT;
+ spapr_tpm_send_crq(dev, &local_crq);
+ break;
+
+ default:
+ trace_tpm_spapr_do_crq_unknown_msg_type(crq->msg);
+ }
+ break;
+ default:
+ trace_tpm_spapr_do_crq_unknown_crq(valid, msg);
+ };
+
+ return H_SUCCESS;
+}
+
+static void tpm_spapr_request_completed(TPMIf *ti, int ret)
+{
+ SpaprTpmState *s = VIO_SPAPR_VTPM(ti);
+ TpmCrq *crq = &s->crq;
+ uint32_t len;
+ int rc;
+
+ s->state = SPAPR_VTPM_STATE_COMPLETION;
+
+ /* a max. of be_buffer_size bytes can be transported */
+ len = MIN(tpm_cmd_get_size(s->buffer), s->be_buffer_size);
+ rc = spapr_vio_dma_write(&s->vdev, be32_to_cpu(crq->data),
+ s->buffer, len);
+
+ if (trace_event_get_state_backends(TRACE_TPM_SPAPR_SHOW_BUFFER)) {
+ tpm_util_show_buffer(s->buffer, len, "From TPM");
+ }
+
+ crq->valid = SPAPR_VTPM_MSG_RESULT;
+ if (rc == H_SUCCESS) {
+ crq->msg = SPAPR_VTPM_TPM_COMMAND | SPAPR_VTPM_MSG_RESULT;
+ crq->len = cpu_to_be16(len);
+ } else {
+ error_report("%s: DMA write failure", __func__);
+ crq->msg = SPAPR_VTPM_VTPM_ERROR;
+ crq->len = cpu_to_be16(0);
+ crq->data = cpu_to_be32(SPAPR_VTPM_ERR_COPY_OUT_FAILED);
+ }
+
+ rc = spapr_tpm_send_crq(&s->vdev, crq);
+ if (rc) {
+ error_report("%s: Error sending response", __func__);
+ }
+}
+
+static int tpm_spapr_do_startup_tpm(SpaprTpmState *s, size_t buffersize)
+{
+ return tpm_backend_startup_tpm(s->be_driver, buffersize);
+}
+
+static const char *tpm_spapr_get_dt_compatible(SpaprVioDevice *dev)
+{
+ SpaprTpmState *s = VIO_SPAPR_VTPM(dev);
+
+ switch (s->be_tpm_version) {
+ case TPM_VERSION_1_2:
+ return "IBM,vtpm";
+ case TPM_VERSION_2_0:
+ return "IBM,vtpm20";
+ default:
+ g_assert_not_reached();
+ }
+}
+
+static void tpm_spapr_reset(SpaprVioDevice *dev)
+{
+ SpaprTpmState *s = VIO_SPAPR_VTPM(dev);
+
+ s->state = SPAPR_VTPM_STATE_NONE;
+
+ s->be_tpm_version = tpm_backend_get_tpm_version(s->be_driver);
+
+ s->be_buffer_size = MIN(tpm_backend_get_buffer_size(s->be_driver),
+ TPM_SPAPR_BUFFER_MAX);
+
+ tpm_backend_reset(s->be_driver);
+ tpm_spapr_do_startup_tpm(s, s->be_buffer_size);
+}
+
+static enum TPMVersion tpm_spapr_get_version(TPMIf *ti)
+{
+ SpaprTpmState *s = VIO_SPAPR_VTPM(ti);
+
+ if (tpm_backend_had_startup_error(s->be_driver)) {
+ return TPM_VERSION_UNSPEC;
+ }
+
+ return tpm_backend_get_tpm_version(s->be_driver);
+}
+
+static const VMStateDescription vmstate_spapr_vtpm = {
+ .name = "tpm-spapr",
+ .unmigratable = 1,
+};
+
+static Property tpm_spapr_properties[] = {
+ DEFINE_SPAPR_PROPERTIES(SpaprTpmState, vdev),
+ DEFINE_PROP_TPMBE("tpmdev", SpaprTpmState, be_driver),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void tpm_spapr_realizefn(SpaprVioDevice *dev, Error **errp)
+{
+ SpaprTpmState *s = VIO_SPAPR_VTPM(dev);
+
+ if (!tpm_find()) {
+ error_setg(errp, "at most one TPM device is permitted");
+ return;
+ }
+
+ dev->crq.SendFunc = tpm_spapr_do_crq;
+
+ if (!s->be_driver) {
+ error_setg(errp, "'tpmdev' property is required");
+ return;
+ }
+ s->buffer = g_malloc(TPM_SPAPR_BUFFER_MAX);
+}
+
+static void tpm_spapr_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ SpaprVioDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass);
+ TPMIfClass *tc = TPM_IF_CLASS(klass);
+
+ k->realize = tpm_spapr_realizefn;
+ k->reset = tpm_spapr_reset;
+ k->dt_name = "vtpm";
+ k->dt_type = "IBM,vtpm";
+ k->get_dt_compatible = tpm_spapr_get_dt_compatible;
+ k->signal_mask = 0x00000001;
+ set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+ device_class_set_props(dc, tpm_spapr_properties);
+ k->rtce_window_size = 0x10000000;
+ dc->vmsd = &vmstate_spapr_vtpm;
+
+ tc->model = TPM_MODEL_TPM_SPAPR;
+ tc->get_version = tpm_spapr_get_version;
+ tc->request_completed = tpm_spapr_request_completed;
+}
+
+static const TypeInfo tpm_spapr_info = {
+ .name = TYPE_TPM_SPAPR,
+ .parent = TYPE_VIO_SPAPR_DEVICE,
+ .instance_size = sizeof(SpaprTpmState),
+ .class_init = tpm_spapr_class_init,
+ .interfaces = (InterfaceInfo[]) {
+ { TYPE_TPM_IF },
+ { }
+ }
+};
+
+static void tpm_spapr_register_types(void)
+{
+ type_register_static(&tpm_spapr_info);
+}
+
+type_init(tpm_spapr_register_types)
diff --git a/hw/tpm/trace-events b/hw/tpm/trace-events
index 357c9e9a84..9143a8eaa3 100644
--- a/hw/tpm/trace-events
+++ b/hw/tpm/trace-events
@@ -55,3 +55,15 @@ tpm_tis_pre_save(uint8_t locty, uint32_t rw_offset) "locty: %d, rw_offset = %u"
# tpm_ppi.c
tpm_ppi_memset(uint8_t *ptr, size_t size) "memset: %p %zu"
+
+# hw/tpm/tpm_spapr.c
+tpm_spapr_show_buffer(const char *direction, size_t len, const char *buf) "direction: %s len: %zu\n%s"
+tpm_spapr_do_crq(uint8_t raw1, uint8_t raw2) "1st 2 bytes in CRQ: 0x%02x 0x%02x"
+tpm_spapr_do_crq_crq_result(void) "SPAPR_VTPM_INIT_CRQ_RESULT"
+tpm_spapr_do_crq_crq_complete_result(void) "SPAPR_VTPM_INIT_CRQ_COMP_RESULT"
+tpm_spapr_do_crq_tpm_command(void) "got TPM command payload"
+tpm_spapr_do_crq_tpm_get_rtce_buffer_size(size_t buffersize) "response: buffer size is %zu"
+tpm_spapr_do_crq_get_version(uint32_t version) "response: version %u"
+tpm_spapr_do_crq_prepare_to_suspend(void) "response: preparing to suspend"
+tpm_spapr_do_crq_unknown_msg_type(uint8_t type) "Unknown message type 0x%02x"
+tpm_spapr_do_crq_unknown_crq(uint8_t raw1, uint8_t raw2) "unknown CRQ 0x%02x 0x%02x ..."