Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into staging
[qemu.git] / tpm.c
1 /*
2 * TPM configuration
3 *
4 * Copyright (C) 2011-2013 IBM Corporation
5 *
6 * Authors:
7 * Stefan Berger <stefanb@us.ibm.com>
8 *
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.
11 *
12 * Based on net.c
13 */
14
15 #include "qemu/osdep.h"
16
17 #include "qapi/error.h"
18 #include "qapi/qapi-commands-tpm.h"
19 #include "qapi/qmp/qerror.h"
20 #include "sysemu/tpm_backend.h"
21 #include "sysemu/tpm.h"
22 #include "qemu/config-file.h"
23 #include "qemu/error-report.h"
24
25 static QLIST_HEAD(, TPMBackend) tpm_backends =
26 QLIST_HEAD_INITIALIZER(tpm_backends);
27
28 static const TPMBackendClass *
29 tpm_be_find_by_type(enum TpmType type)
30 {
31 ObjectClass *oc;
32 char *typename = g_strdup_printf("tpm-%s", TpmType_str(type));
33
34 oc = object_class_by_name(typename);
35 g_free(typename);
36
37 if (!object_class_dynamic_cast(oc, TYPE_TPM_BACKEND)) {
38 return NULL;
39 }
40
41 return TPM_BACKEND_CLASS(oc);
42 }
43
44 /*
45 * Walk the list of available TPM backend drivers and display them on the
46 * screen.
47 */
48 static void tpm_display_backend_drivers(void)
49 {
50 int i;
51
52 fprintf(stderr, "Supported TPM types (choose only one):\n");
53
54 for (i = 0; i < TPM_TYPE__MAX; i++) {
55 const TPMBackendClass *bc = tpm_be_find_by_type(i);
56 if (!bc) {
57 continue;
58 }
59 fprintf(stderr, "%12s %s\n", TpmType_str(i), bc->desc);
60 }
61 fprintf(stderr, "\n");
62 }
63
64 /*
65 * Find the TPM with the given Id
66 */
67 TPMBackend *qemu_find_tpm_be(const char *id)
68 {
69 TPMBackend *drv;
70
71 if (id) {
72 QLIST_FOREACH(drv, &tpm_backends, list) {
73 if (!strcmp(drv->id, id)) {
74 return drv;
75 }
76 }
77 }
78
79 return NULL;
80 }
81
82 static int tpm_init_tpmdev(void *dummy, QemuOpts *opts, Error **errp)
83 {
84 const char *value;
85 const char *id;
86 const TPMBackendClass *be;
87 TPMBackend *drv;
88 Error *local_err = NULL;
89 int i;
90
91 if (!QLIST_EMPTY(&tpm_backends)) {
92 error_setg(errp, "Only one TPM is allowed.");
93 return 1;
94 }
95
96 id = qemu_opts_id(opts);
97 if (id == NULL) {
98 error_setg(errp, QERR_MISSING_PARAMETER, "id");
99 return 1;
100 }
101
102 value = qemu_opt_get(opts, "type");
103 if (!value) {
104 error_setg(errp, QERR_MISSING_PARAMETER, "type");
105 tpm_display_backend_drivers();
106 return 1;
107 }
108
109 i = qapi_enum_parse(&TpmType_lookup, value, -1, NULL);
110 be = i >= 0 ? tpm_be_find_by_type(i) : NULL;
111 if (be == NULL) {
112 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
113 "a TPM backend type");
114 tpm_display_backend_drivers();
115 return 1;
116 }
117
118 /* validate backend specific opts */
119 qemu_opts_validate(opts, be->opts, &local_err);
120 if (local_err) {
121 error_propagate(errp, local_err);
122 return 1;
123 }
124
125 drv = be->create(opts);
126 if (!drv) {
127 return 1;
128 }
129
130 drv->id = g_strdup(id);
131 QLIST_INSERT_HEAD(&tpm_backends, drv, list);
132
133 return 0;
134 }
135
136 /*
137 * Walk the list of TPM backend drivers that are in use and call their
138 * destroy function to have them cleaned up.
139 */
140 void tpm_cleanup(void)
141 {
142 TPMBackend *drv, *next;
143
144 QLIST_FOREACH_SAFE(drv, &tpm_backends, list, next) {
145 QLIST_REMOVE(drv, list);
146 object_unref(OBJECT(drv));
147 }
148 }
149
150 /*
151 * Initialize the TPM. Process the tpmdev command line options describing the
152 * TPM backend.
153 */
154 void tpm_init(void)
155 {
156 qemu_opts_foreach(qemu_find_opts("tpmdev"),
157 tpm_init_tpmdev, NULL, &error_fatal);
158 }
159
160 /*
161 * Parse the TPM configuration options.
162 * To display all available TPM backends the user may use '-tpmdev help'
163 */
164 int tpm_config_parse(QemuOptsList *opts_list, const char *optarg)
165 {
166 QemuOpts *opts;
167
168 if (!strcmp(optarg, "help")) {
169 tpm_display_backend_drivers();
170 return -1;
171 }
172 opts = qemu_opts_parse_noisily(opts_list, optarg, true);
173 if (!opts) {
174 return -1;
175 }
176 return 0;
177 }
178
179 /*
180 * Walk the list of active TPM backends and collect information about them.
181 */
182 TPMInfoList *qmp_query_tpm(Error **errp)
183 {
184 TPMBackend *drv;
185 TPMInfoList *info, *head = NULL, *cur_item = NULL;
186
187 QLIST_FOREACH(drv, &tpm_backends, list) {
188 if (!drv->tpmif) {
189 continue;
190 }
191
192 info = g_new0(TPMInfoList, 1);
193 info->value = tpm_backend_query_tpm(drv);
194
195 if (!cur_item) {
196 head = cur_item = info;
197 } else {
198 cur_item->next = info;
199 cur_item = info;
200 }
201 }
202
203 return head;
204 }
205
206 TpmTypeList *qmp_query_tpm_types(Error **errp)
207 {
208 unsigned int i = 0;
209 TpmTypeList *head = NULL, *prev = NULL, *cur_item;
210
211 for (i = 0; i < TPM_TYPE__MAX; i++) {
212 if (!tpm_be_find_by_type(i)) {
213 continue;
214 }
215 cur_item = g_new0(TpmTypeList, 1);
216 cur_item->value = i;
217
218 if (prev) {
219 prev->next = cur_item;
220 }
221 if (!head) {
222 head = cur_item;
223 }
224 prev = cur_item;
225 }
226
227 return head;
228 }
229 TpmModelList *qmp_query_tpm_models(Error **errp)
230 {
231 TpmModelList *head = NULL, *prev = NULL, *cur_item;
232 GSList *e, *l = object_class_get_list(TYPE_TPM_IF, false);
233
234 for (e = l; e; e = e->next) {
235 TPMIfClass *c = TPM_IF_CLASS(e->data);
236
237 cur_item = g_new0(TpmModelList, 1);
238 cur_item->value = c->model;
239
240 if (prev) {
241 prev->next = cur_item;
242 }
243 if (!head) {
244 head = cur_item;
245 }
246 prev = cur_item;
247 }
248 g_slist_free(l);
249
250 return head;
251 }