tpm-backend: Move realloc_buffer() implementation to tpm-tis model
[qemu.git] / backends / tpm.c
1 /*
2 * QEMU TPM Backend
3 *
4 * Copyright IBM, Corp. 2013
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 backends/rng.c by Anthony Liguori
13 */
14
15 #include "qemu/osdep.h"
16 #include "sysemu/tpm_backend.h"
17 #include "qapi/error.h"
18 #include "qapi/qmp/qerror.h"
19 #include "sysemu/tpm.h"
20 #include "qemu/thread.h"
21
22 static void tpm_backend_worker_thread(gpointer data, gpointer user_data)
23 {
24 TPMBackend *s = TPM_BACKEND(user_data);
25 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
26
27 assert(k->handle_request != NULL);
28 k->handle_request(s, (TPMBackendCmd)data);
29 }
30
31 static void tpm_backend_thread_end(TPMBackend *s)
32 {
33 if (s->thread_pool) {
34 g_thread_pool_push(s->thread_pool, (gpointer)TPM_BACKEND_CMD_END, NULL);
35 g_thread_pool_free(s->thread_pool, FALSE, TRUE);
36 s->thread_pool = NULL;
37 }
38 }
39
40 enum TpmType tpm_backend_get_type(TPMBackend *s)
41 {
42 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
43
44 return k->ops->type;
45 }
46
47 int tpm_backend_init(TPMBackend *s, TPMState *state,
48 TPMRecvDataCB *datacb)
49 {
50 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
51
52 s->tpm_state = state;
53 s->recv_data_callback = datacb;
54 s->had_startup_error = false;
55
56 return k->ops->init ? k->ops->init(s) : 0;
57 }
58
59 int tpm_backend_startup_tpm(TPMBackend *s)
60 {
61 int res = 0;
62 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
63
64 /* terminate a running TPM */
65 tpm_backend_thread_end(s);
66
67 s->thread_pool = g_thread_pool_new(tpm_backend_worker_thread, s, 1, TRUE,
68 NULL);
69 g_thread_pool_push(s->thread_pool, (gpointer)TPM_BACKEND_CMD_INIT, NULL);
70
71 res = k->ops->startup_tpm ? k->ops->startup_tpm(s) : 0;
72
73 s->had_startup_error = (res != 0);
74
75 return res;
76 }
77
78 bool tpm_backend_had_startup_error(TPMBackend *s)
79 {
80 return s->had_startup_error;
81 }
82
83 void tpm_backend_deliver_request(TPMBackend *s)
84 {
85 g_thread_pool_push(s->thread_pool, (gpointer)TPM_BACKEND_CMD_PROCESS_CMD,
86 NULL);
87 }
88
89 void tpm_backend_reset(TPMBackend *s)
90 {
91 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
92
93 if (k->ops->reset) {
94 k->ops->reset(s);
95 }
96
97 tpm_backend_thread_end(s);
98
99 s->had_startup_error = false;
100 }
101
102 void tpm_backend_cancel_cmd(TPMBackend *s)
103 {
104 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
105
106 assert(k->ops->cancel_cmd);
107
108 k->ops->cancel_cmd(s);
109 }
110
111 bool tpm_backend_get_tpm_established_flag(TPMBackend *s)
112 {
113 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
114
115 return k->ops->get_tpm_established_flag ?
116 k->ops->get_tpm_established_flag(s) : false;
117 }
118
119 int tpm_backend_reset_tpm_established_flag(TPMBackend *s, uint8_t locty)
120 {
121 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
122
123 return k->ops->reset_tpm_established_flag ?
124 k->ops->reset_tpm_established_flag(s, locty) : 0;
125 }
126
127 TPMVersion tpm_backend_get_tpm_version(TPMBackend *s)
128 {
129 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
130
131 assert(k->ops->get_tpm_version);
132
133 return k->ops->get_tpm_version(s);
134 }
135
136 TPMInfo *tpm_backend_query_tpm(TPMBackend *s)
137 {
138 TPMInfo *info = g_new0(TPMInfo, 1);
139 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
140
141 info->id = g_strdup(s->id);
142 info->model = s->fe_model;
143 info->options = k->ops->get_tpm_options ?
144 k->ops->get_tpm_options(s) : NULL;
145
146 return info;
147 }
148
149 static bool tpm_backend_prop_get_opened(Object *obj, Error **errp)
150 {
151 TPMBackend *s = TPM_BACKEND(obj);
152
153 return s->opened;
154 }
155
156 void tpm_backend_open(TPMBackend *s, Error **errp)
157 {
158 object_property_set_bool(OBJECT(s), true, "opened", errp);
159 }
160
161 static void tpm_backend_prop_set_opened(Object *obj, bool value, Error **errp)
162 {
163 TPMBackend *s = TPM_BACKEND(obj);
164 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
165 Error *local_err = NULL;
166
167 if (value == s->opened) {
168 return;
169 }
170
171 if (!value && s->opened) {
172 error_setg(errp, QERR_PERMISSION_DENIED);
173 return;
174 }
175
176 if (k->opened) {
177 k->opened(s, &local_err);
178 if (local_err) {
179 error_propagate(errp, local_err);
180 return;
181 }
182 }
183
184 s->opened = true;
185 }
186
187 static void tpm_backend_instance_init(Object *obj)
188 {
189 TPMBackend *s = TPM_BACKEND(obj);
190
191 object_property_add_bool(obj, "opened",
192 tpm_backend_prop_get_opened,
193 tpm_backend_prop_set_opened,
194 NULL);
195 s->fe_model = -1;
196 }
197
198 static void tpm_backend_instance_finalize(Object *obj)
199 {
200 TPMBackend *s = TPM_BACKEND(obj);
201
202 g_free(s->id);
203 tpm_backend_thread_end(s);
204 }
205
206 static const TypeInfo tpm_backend_info = {
207 .name = TYPE_TPM_BACKEND,
208 .parent = TYPE_OBJECT,
209 .instance_size = sizeof(TPMBackend),
210 .instance_init = tpm_backend_instance_init,
211 .instance_finalize = tpm_backend_instance_finalize,
212 .class_size = sizeof(TPMBackendClass),
213 .abstract = true,
214 };
215
216 static void register_types(void)
217 {
218 type_register_static(&tpm_backend_info);
219 }
220
221 type_init(register_types);