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authorPaolo Bonzini <pbonzini@redhat.com>2013-04-02 18:28:41 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2013-04-15 18:19:25 +0200
commitbdee56f5466a724f043e6cfcfcf69866cc48cc94 (patch)
tree342c4de4d6e553b4116860489f671fdba7fd950c /tpm.c
parent3b8acc11d3f60792f9f716f2a93c258e729af980 (diff)
downloadqemu-arm-bdee56f5466a724f043e6cfcfcf69866cc48cc94.tar.gz
tpm: reorganize headers and split hardware part
The TPM subsystem does not have a full front-end/back-end separation. The sole available backend, tpm_passthrough, depends on the data structures of the sole available frontend, tpm_tis. However, we can at least try to split the user interface (tpm.c) from the implementation (hw/tpm). The patches makes tpm.c not include tpm_int.h, which is shared between tpm_tis.c and tpm_passthrough.c; instead it moves more stuff to tpm_backend.h. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'tpm.c')
-rw-r--r--tpm.c350
1 files changed, 350 insertions, 0 deletions
diff --git a/tpm.c b/tpm.c
new file mode 100644
index 0000000000..1e943148d2
--- /dev/null
+++ b/tpm.c
@@ -0,0 +1,350 @@
+/*
+ * TPM configuration
+ *
+ * Copyright (C) 2011-2013 IBM Corporation
+ *
+ * Authors:
+ * Stefan Berger <stefanb@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ * Based on net.c
+ */
+#include "config-host.h"
+
+#include "monitor/monitor.h"
+#include "qapi/qmp/qerror.h"
+#include "backends/tpm.h"
+#include "sysemu/tpm.h"
+#include "qemu/config-file.h"
+#include "qmp-commands.h"
+
+static QLIST_HEAD(, TPMBackend) tpm_backends =
+ QLIST_HEAD_INITIALIZER(tpm_backends);
+
+
+#define TPM_MAX_MODELS 1
+#define TPM_MAX_DRIVERS 1
+
+static TPMDriverOps const *be_drivers[TPM_MAX_DRIVERS] = {
+ NULL,
+};
+
+static enum TpmModel tpm_models[TPM_MAX_MODELS] = {
+ -1,
+};
+
+int tpm_register_model(enum TpmModel model)
+{
+ int i;
+
+ for (i = 0; i < TPM_MAX_MODELS; i++) {
+ if (tpm_models[i] == -1) {
+ tpm_models[i] = model;
+ return 0;
+ }
+ }
+ error_report("Could not register TPM model");
+ return 1;
+}
+
+static bool tpm_model_is_registered(enum TpmModel model)
+{
+ int i;
+
+ for (i = 0; i < TPM_MAX_MODELS; i++) {
+ if (tpm_models[i] == model) {
+ return true;
+ }
+ }
+ return false;
+}
+
+const TPMDriverOps *tpm_get_backend_driver(const char *type)
+{
+ int i;
+
+ for (i = 0; i < TPM_MAX_DRIVERS && be_drivers[i] != NULL; i++) {
+ if (!strcmp(TpmType_lookup[be_drivers[i]->type], type)) {
+ return be_drivers[i];
+ }
+ }
+
+ return NULL;
+}
+
+#ifdef CONFIG_TPM
+
+int tpm_register_driver(const TPMDriverOps *tdo)
+{
+ int i;
+
+ for (i = 0; i < TPM_MAX_DRIVERS; i++) {
+ if (!be_drivers[i]) {
+ be_drivers[i] = tdo;
+ return 0;
+ }
+ }
+ error_report("Could not register TPM driver");
+ return 1;
+}
+
+/*
+ * Walk the list of available TPM backend drivers and display them on the
+ * screen.
+ */
+static void tpm_display_backend_drivers(void)
+{
+ int i;
+
+ fprintf(stderr, "Supported TPM types (choose only one):\n");
+
+ for (i = 0; i < TPM_MAX_DRIVERS && be_drivers[i] != NULL; i++) {
+ fprintf(stderr, "%12s %s\n",
+ TpmType_lookup[be_drivers[i]->type], be_drivers[i]->desc());
+ }
+ fprintf(stderr, "\n");
+}
+
+/*
+ * Find the TPM with the given Id
+ */
+TPMBackend *qemu_find_tpm(const char *id)
+{
+ TPMBackend *drv;
+
+ if (id) {
+ QLIST_FOREACH(drv, &tpm_backends, list) {
+ if (!strcmp(drv->id, id)) {
+ return drv;
+ }
+ }
+ }
+
+ return NULL;
+}
+
+static int configure_tpm(QemuOpts *opts)
+{
+ const char *value;
+ const char *id;
+ const TPMDriverOps *be;
+ TPMBackend *drv;
+ Error *local_err = NULL;
+
+ if (!QLIST_EMPTY(&tpm_backends)) {
+ error_report("Only one TPM is allowed.\n");
+ return 1;
+ }
+
+ id = qemu_opts_id(opts);
+ if (id == NULL) {
+ qerror_report(QERR_MISSING_PARAMETER, "id");
+ return 1;
+ }
+
+ value = qemu_opt_get(opts, "type");
+ if (!value) {
+ qerror_report(QERR_MISSING_PARAMETER, "type");
+ tpm_display_backend_drivers();
+ return 1;
+ }
+
+ be = tpm_get_backend_driver(value);
+ if (be == NULL) {
+ qerror_report(QERR_INVALID_PARAMETER_VALUE, "type",
+ "a TPM backend type");
+ tpm_display_backend_drivers();
+ return 1;
+ }
+
+ drv = be->create(opts, id);
+ if (!drv) {
+ return 1;
+ }
+
+ tpm_backend_open(drv, &local_err);
+ if (local_err) {
+ qerror_report_err(local_err);
+ error_free(local_err);
+ return 1;
+ }
+
+ QLIST_INSERT_HEAD(&tpm_backends, drv, list);
+
+ return 0;
+}
+
+static int tpm_init_tpmdev(QemuOpts *opts, void *dummy)
+{
+ return configure_tpm(opts);
+}
+
+/*
+ * Walk the list of TPM backend drivers that are in use and call their
+ * destroy function to have them cleaned up.
+ */
+void tpm_cleanup(void)
+{
+ TPMBackend *drv, *next;
+
+ QLIST_FOREACH_SAFE(drv, &tpm_backends, list, next) {
+ QLIST_REMOVE(drv, list);
+ tpm_backend_destroy(drv);
+ }
+}
+
+/*
+ * Initialize the TPM. Process the tpmdev command line options describing the
+ * TPM backend.
+ */
+int tpm_init(void)
+{
+ if (qemu_opts_foreach(qemu_find_opts("tpmdev"),
+ tpm_init_tpmdev, NULL, 1) != 0) {
+ return -1;
+ }
+
+ atexit(tpm_cleanup);
+
+ return 0;
+}
+
+/*
+ * Parse the TPM configuration options.
+ * To display all available TPM backends the user may use '-tpmdev help'
+ */
+int tpm_config_parse(QemuOptsList *opts_list, const char *optarg)
+{
+ QemuOpts *opts;
+
+ if (!strcmp(optarg, "help")) {
+ tpm_display_backend_drivers();
+ return -1;
+ }
+ opts = qemu_opts_parse(opts_list, optarg, 1);
+ if (!opts) {
+ return -1;
+ }
+ return 0;
+}
+
+#endif /* CONFIG_TPM */
+
+static const TPMDriverOps *tpm_driver_find_by_type(enum TpmType type)
+{
+ int i;
+
+ for (i = 0; i < TPM_MAX_DRIVERS && be_drivers[i] != NULL; i++) {
+ if (be_drivers[i]->type == type) {
+ return be_drivers[i];
+ }
+ }
+ return NULL;
+}
+
+static TPMInfo *qmp_query_tpm_inst(TPMBackend *drv)
+{
+ TPMInfo *res = g_new0(TPMInfo, 1);
+ TPMPassthroughOptions *tpo;
+
+ res->id = g_strdup(drv->id);
+ res->model = drv->fe_model;
+ res->options = g_new0(TpmTypeOptions, 1);
+
+ switch (drv->ops->type) {
+ case TPM_TYPE_PASSTHROUGH:
+ res->options->kind = TPM_TYPE_OPTIONS_KIND_PASSTHROUGH;
+ tpo = g_new0(TPMPassthroughOptions, 1);
+ res->options->passthrough = tpo;
+ if (drv->path) {
+ tpo->path = g_strdup(drv->path);
+ tpo->has_path = true;
+ }
+ if (drv->cancel_path) {
+ tpo->cancel_path = g_strdup(drv->cancel_path);
+ tpo->has_cancel_path = true;
+ }
+ break;
+ case TPM_TYPE_MAX:
+ break;
+ }
+
+ return res;
+}
+
+/*
+ * Walk the list of active TPM backends and collect information about them
+ * following the schema description in qapi-schema.json.
+ */
+TPMInfoList *qmp_query_tpm(Error **errp)
+{
+ TPMBackend *drv;
+ TPMInfoList *info, *head = NULL, *cur_item = NULL;
+
+ QLIST_FOREACH(drv, &tpm_backends, list) {
+ if (!tpm_model_is_registered(drv->fe_model)) {
+ continue;
+ }
+ info = g_new0(TPMInfoList, 1);
+ info->value = qmp_query_tpm_inst(drv);
+
+ if (!cur_item) {
+ head = cur_item = info;
+ } else {
+ cur_item->next = info;
+ cur_item = info;
+ }
+ }
+
+ return head;
+}
+
+TpmTypeList *qmp_query_tpm_types(Error **errp)
+{
+ unsigned int i = 0;
+ TpmTypeList *head = NULL, *prev = NULL, *cur_item;
+
+ for (i = 0; i < TPM_TYPE_MAX; i++) {
+ if (!tpm_driver_find_by_type(i)) {
+ continue;
+ }
+ cur_item = g_new0(TpmTypeList, 1);
+ cur_item->value = i;
+
+ if (prev) {
+ prev->next = cur_item;
+ }
+ if (!head) {
+ head = cur_item;
+ }
+ prev = cur_item;
+ }
+
+ return head;
+}
+
+TpmModelList *qmp_query_tpm_models(Error **errp)
+{
+ unsigned int i = 0;
+ TpmModelList *head = NULL, *prev = NULL, *cur_item;
+
+ for (i = 0; i < TPM_MODEL_MAX; i++) {
+ if (!tpm_model_is_registered(i)) {
+ continue;
+ }
+ cur_item = g_new0(TpmModelList, 1);
+ cur_item->value = i;
+
+ if (prev) {
+ prev->next = cur_item;
+ }
+ if (!head) {
+ head = cur_item;
+ }
+ prev = cur_item;
+ }
+
+ return head;
+}