/* * 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 "qemu/osdep.h" #include "qapi/qmp/qerror.h" #include "sysemu/tpm_backend.h" #include "sysemu/tpm.h" #include "qemu/config-file.h" #include "qemu/error-report.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] = { TPM_MODEL__MAX, }; int tpm_register_model(enum TpmModel model) { int i; for (i = 0; i < TPM_MAX_MODELS; i++) { if (tpm_models[i] == TPM_MODEL__MAX) { 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."); return 1; } id = qemu_opts_id(opts); if (id == NULL) { error_report(QERR_MISSING_PARAMETER, "id"); return 1; } value = qemu_opt_get(opts, "type"); if (!value) { error_report(QERR_MISSING_PARAMETER, "type"); tpm_display_backend_drivers(); return 1; } be = tpm_get_backend_driver(value); if (be == NULL) { error_report(QERR_INVALID_PARAMETER_VALUE, "type", "a TPM backend type"); tpm_display_backend_drivers(); return 1; } /* validate backend specific opts */ qemu_opts_validate(opts, be->opts, &local_err); if (local_err) { error_report_err(local_err); return 1; } drv = be->create(opts, id); if (!drv) { return 1; } tpm_backend_open(drv, &local_err); if (local_err) { error_report_err(local_err); return 1; } QLIST_INSERT_HEAD(&tpm_backends, drv, list); return 0; } static int tpm_init_tpmdev(void *dummy, QemuOpts *opts, Error **errp) { 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, NULL)) { 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_noisily(opts_list, optarg, true); 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->type = TPM_TYPE_OPTIONS_KIND_PASSTHROUGH; tpo = g_new0(TPMPassthroughOptions, 1); res->options->u.passthrough.data = 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; }