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[qemu/cris-port.git] / tpm.c
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1 /*
2 * TPM configuration
4 * Copyright (C) 2011-2013 IBM Corporation
6 * Authors:
7 * Stefan Berger <stefanb@us.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2 or later.
10 * See the COPYING file in the top-level directory.
12 * Based on net.c
14 #include "config-host.h"
16 #include "monitor/monitor.h"
17 #include "qapi/qmp/qerror.h"
18 #include "sysemu/tpm_backend.h"
19 #include "sysemu/tpm.h"
20 #include "qemu/config-file.h"
21 #include "qmp-commands.h"
23 static QLIST_HEAD(, TPMBackend) tpm_backends =
24 QLIST_HEAD_INITIALIZER(tpm_backends);
27 #define TPM_MAX_MODELS 1
28 #define TPM_MAX_DRIVERS 1
30 static TPMDriverOps const *be_drivers[TPM_MAX_DRIVERS] = {
31 NULL,
34 static enum TpmModel tpm_models[TPM_MAX_MODELS] = {
35 TPM_MODEL_MAX,
38 int tpm_register_model(enum TpmModel model)
40 int i;
42 for (i = 0; i < TPM_MAX_MODELS; i++) {
43 if (tpm_models[i] == TPM_MODEL_MAX) {
44 tpm_models[i] = model;
45 return 0;
48 error_report("Could not register TPM model");
49 return 1;
52 static bool tpm_model_is_registered(enum TpmModel model)
54 int i;
56 for (i = 0; i < TPM_MAX_MODELS; i++) {
57 if (tpm_models[i] == model) {
58 return true;
61 return false;
64 const TPMDriverOps *tpm_get_backend_driver(const char *type)
66 int i;
68 for (i = 0; i < TPM_MAX_DRIVERS && be_drivers[i] != NULL; i++) {
69 if (!strcmp(TpmType_lookup[be_drivers[i]->type], type)) {
70 return be_drivers[i];
74 return NULL;
77 #ifdef CONFIG_TPM
79 int tpm_register_driver(const TPMDriverOps *tdo)
81 int i;
83 for (i = 0; i < TPM_MAX_DRIVERS; i++) {
84 if (!be_drivers[i]) {
85 be_drivers[i] = tdo;
86 return 0;
89 error_report("Could not register TPM driver");
90 return 1;
94 * Walk the list of available TPM backend drivers and display them on the
95 * screen.
97 static void tpm_display_backend_drivers(void)
99 int i;
101 fprintf(stderr, "Supported TPM types (choose only one):\n");
103 for (i = 0; i < TPM_MAX_DRIVERS && be_drivers[i] != NULL; i++) {
104 fprintf(stderr, "%12s %s\n",
105 TpmType_lookup[be_drivers[i]->type], be_drivers[i]->desc());
107 fprintf(stderr, "\n");
111 * Find the TPM with the given Id
113 TPMBackend *qemu_find_tpm(const char *id)
115 TPMBackend *drv;
117 if (id) {
118 QLIST_FOREACH(drv, &tpm_backends, list) {
119 if (!strcmp(drv->id, id)) {
120 return drv;
125 return NULL;
128 static int configure_tpm(QemuOpts *opts)
130 const char *value;
131 const char *id;
132 const TPMDriverOps *be;
133 TPMBackend *drv;
134 Error *local_err = NULL;
136 if (!QLIST_EMPTY(&tpm_backends)) {
137 error_report("Only one TPM is allowed.\n");
138 return 1;
141 id = qemu_opts_id(opts);
142 if (id == NULL) {
143 qerror_report(QERR_MISSING_PARAMETER, "id");
144 return 1;
147 value = qemu_opt_get(opts, "type");
148 if (!value) {
149 qerror_report(QERR_MISSING_PARAMETER, "type");
150 tpm_display_backend_drivers();
151 return 1;
154 be = tpm_get_backend_driver(value);
155 if (be == NULL) {
156 qerror_report(QERR_INVALID_PARAMETER_VALUE, "type",
157 "a TPM backend type");
158 tpm_display_backend_drivers();
159 return 1;
162 /* validate backend specific opts */
163 qemu_opts_validate(opts, be->opts, &local_err);
164 if (local_err) {
165 error_report_err(local_err);
166 return 1;
169 drv = be->create(opts, id);
170 if (!drv) {
171 return 1;
174 tpm_backend_open(drv, &local_err);
175 if (local_err) {
176 error_report_err(local_err);
177 return 1;
180 QLIST_INSERT_HEAD(&tpm_backends, drv, list);
182 return 0;
185 static int tpm_init_tpmdev(QemuOpts *opts, void *dummy)
187 return configure_tpm(opts);
191 * Walk the list of TPM backend drivers that are in use and call their
192 * destroy function to have them cleaned up.
194 void tpm_cleanup(void)
196 TPMBackend *drv, *next;
198 QLIST_FOREACH_SAFE(drv, &tpm_backends, list, next) {
199 QLIST_REMOVE(drv, list);
200 tpm_backend_destroy(drv);
205 * Initialize the TPM. Process the tpmdev command line options describing the
206 * TPM backend.
208 int tpm_init(void)
210 if (qemu_opts_foreach(qemu_find_opts("tpmdev"),
211 tpm_init_tpmdev, NULL, 1) != 0) {
212 return -1;
215 atexit(tpm_cleanup);
217 return 0;
221 * Parse the TPM configuration options.
222 * To display all available TPM backends the user may use '-tpmdev help'
224 int tpm_config_parse(QemuOptsList *opts_list, const char *optarg)
226 QemuOpts *opts;
228 if (!strcmp(optarg, "help")) {
229 tpm_display_backend_drivers();
230 return -1;
232 opts = qemu_opts_parse(opts_list, optarg, 1);
233 if (!opts) {
234 return -1;
236 return 0;
239 #endif /* CONFIG_TPM */
241 static const TPMDriverOps *tpm_driver_find_by_type(enum TpmType type)
243 int i;
245 for (i = 0; i < TPM_MAX_DRIVERS && be_drivers[i] != NULL; i++) {
246 if (be_drivers[i]->type == type) {
247 return be_drivers[i];
250 return NULL;
253 static TPMInfo *qmp_query_tpm_inst(TPMBackend *drv)
255 TPMInfo *res = g_new0(TPMInfo, 1);
256 TPMPassthroughOptions *tpo;
258 res->id = g_strdup(drv->id);
259 res->model = drv->fe_model;
260 res->options = g_new0(TpmTypeOptions, 1);
262 switch (drv->ops->type) {
263 case TPM_TYPE_PASSTHROUGH:
264 res->options->kind = TPM_TYPE_OPTIONS_KIND_PASSTHROUGH;
265 tpo = g_new0(TPMPassthroughOptions, 1);
266 res->options->passthrough = tpo;
267 if (drv->path) {
268 tpo->path = g_strdup(drv->path);
269 tpo->has_path = true;
271 if (drv->cancel_path) {
272 tpo->cancel_path = g_strdup(drv->cancel_path);
273 tpo->has_cancel_path = true;
275 break;
276 case TPM_TYPE_MAX:
277 break;
280 return res;
284 * Walk the list of active TPM backends and collect information about them
285 * following the schema description in qapi-schema.json.
287 TPMInfoList *qmp_query_tpm(Error **errp)
289 TPMBackend *drv;
290 TPMInfoList *info, *head = NULL, *cur_item = NULL;
292 QLIST_FOREACH(drv, &tpm_backends, list) {
293 if (!tpm_model_is_registered(drv->fe_model)) {
294 continue;
296 info = g_new0(TPMInfoList, 1);
297 info->value = qmp_query_tpm_inst(drv);
299 if (!cur_item) {
300 head = cur_item = info;
301 } else {
302 cur_item->next = info;
303 cur_item = info;
307 return head;
310 TpmTypeList *qmp_query_tpm_types(Error **errp)
312 unsigned int i = 0;
313 TpmTypeList *head = NULL, *prev = NULL, *cur_item;
315 for (i = 0; i < TPM_TYPE_MAX; i++) {
316 if (!tpm_driver_find_by_type(i)) {
317 continue;
319 cur_item = g_new0(TpmTypeList, 1);
320 cur_item->value = i;
322 if (prev) {
323 prev->next = cur_item;
325 if (!head) {
326 head = cur_item;
328 prev = cur_item;
331 return head;
334 TpmModelList *qmp_query_tpm_models(Error **errp)
336 unsigned int i = 0;
337 TpmModelList *head = NULL, *prev = NULL, *cur_item;
339 for (i = 0; i < TPM_MODEL_MAX; i++) {
340 if (!tpm_model_is_registered(i)) {
341 continue;
343 cur_item = g_new0(TpmModelList, 1);
344 cur_item->value = i;
346 if (prev) {
347 prev->next = cur_item;
349 if (!head) {
350 head = cur_item;
352 prev = cur_item;
355 return head;