diff options
Diffstat (limited to 'tpm.c')
| -rw-r--r-- | tpm.c | 350 |
1 files changed, 350 insertions, 0 deletions
@@ -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; +} |