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 "hw/tpm/tpm_int.h" 21 #include "qemu/thread.h" 22 23 static void tpm_backend_worker_thread(gpointer data, gpointer user_data) 24 { 25 TPMBackend *s = TPM_BACKEND(user_data); 26 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); 27 28 assert(k->handle_request != NULL); 29 k->handle_request(s, (TPMBackendCmd *)data); 30 } 31 32 static void tpm_backend_thread_end(TPMBackend *s) 33 { 34 if (s->thread_pool) { 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->type; 45 } 46 47 int tpm_backend_init(TPMBackend *s, TPMState *state, 48 TPMRecvDataCB *datacb) 49 { 50 s->tpm_state = state; 51 s->recv_data_callback = datacb; 52 s->had_startup_error = false; 53 54 return 0; 55 } 56 57 int tpm_backend_startup_tpm(TPMBackend *s) 58 { 59 int res = 0; 60 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); 61 62 /* terminate a running TPM */ 63 tpm_backend_thread_end(s); 64 65 s->thread_pool = g_thread_pool_new(tpm_backend_worker_thread, s, 1, TRUE, 66 NULL); 67 68 res = k->startup_tpm ? k->startup_tpm(s) : 0; 69 70 s->had_startup_error = (res != 0); 71 72 return res; 73 } 74 75 bool tpm_backend_had_startup_error(TPMBackend *s) 76 { 77 return s->had_startup_error; 78 } 79 80 void tpm_backend_deliver_request(TPMBackend *s, TPMBackendCmd *cmd) 81 { 82 g_thread_pool_push(s->thread_pool, cmd, NULL); 83 } 84 85 void tpm_backend_reset(TPMBackend *s) 86 { 87 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); 88 89 if (k->reset) { 90 k->reset(s); 91 } 92 93 tpm_backend_thread_end(s); 94 95 s->had_startup_error = false; 96 } 97 98 void tpm_backend_cancel_cmd(TPMBackend *s) 99 { 100 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); 101 102 assert(k->cancel_cmd); 103 104 k->cancel_cmd(s); 105 } 106 107 bool tpm_backend_get_tpm_established_flag(TPMBackend *s) 108 { 109 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); 110 111 return k->get_tpm_established_flag ? 112 k->get_tpm_established_flag(s) : false; 113 } 114 115 int tpm_backend_reset_tpm_established_flag(TPMBackend *s, uint8_t locty) 116 { 117 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); 118 119 return k->reset_tpm_established_flag ? 120 k->reset_tpm_established_flag(s, locty) : 0; 121 } 122 123 TPMVersion tpm_backend_get_tpm_version(TPMBackend *s) 124 { 125 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); 126 127 assert(k->get_tpm_version); 128 129 return k->get_tpm_version(s); 130 } 131 132 TPMInfo *tpm_backend_query_tpm(TPMBackend *s) 133 { 134 TPMInfo *info = g_new0(TPMInfo, 1); 135 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); 136 137 info->id = g_strdup(s->id); 138 info->model = s->fe_model; 139 if (k->get_tpm_options) { 140 info->options = k->get_tpm_options(s); 141 } 142 143 return info; 144 } 145 146 static bool tpm_backend_prop_get_opened(Object *obj, Error **errp) 147 { 148 TPMBackend *s = TPM_BACKEND(obj); 149 150 return s->opened; 151 } 152 153 void tpm_backend_open(TPMBackend *s, Error **errp) 154 { 155 object_property_set_bool(OBJECT(s), true, "opened", errp); 156 } 157 158 static void tpm_backend_prop_set_opened(Object *obj, bool value, Error **errp) 159 { 160 TPMBackend *s = TPM_BACKEND(obj); 161 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); 162 Error *local_err = NULL; 163 164 if (value == s->opened) { 165 return; 166 } 167 168 if (!value && s->opened) { 169 error_setg(errp, QERR_PERMISSION_DENIED); 170 return; 171 } 172 173 if (k->opened) { 174 k->opened(s, &local_err); 175 if (local_err) { 176 error_propagate(errp, local_err); 177 return; 178 } 179 } 180 181 s->opened = true; 182 } 183 184 static void tpm_backend_instance_init(Object *obj) 185 { 186 TPMBackend *s = TPM_BACKEND(obj); 187 188 object_property_add_bool(obj, "opened", 189 tpm_backend_prop_get_opened, 190 tpm_backend_prop_set_opened, 191 NULL); 192 s->fe_model = -1; 193 } 194 195 static void tpm_backend_instance_finalize(Object *obj) 196 { 197 TPMBackend *s = TPM_BACKEND(obj); 198 199 g_free(s->id); 200 tpm_backend_thread_end(s); 201 } 202 203 static const TypeInfo tpm_backend_info = { 204 .name = TYPE_TPM_BACKEND, 205 .parent = TYPE_OBJECT, 206 .instance_size = sizeof(TPMBackend), 207 .instance_init = tpm_backend_instance_init, 208 .instance_finalize = tpm_backend_instance_finalize, 209 .class_size = sizeof(TPMBackendClass), 210 .abstract = true, 211 }; 212 213 static const TypeInfo tpm_if_info = { 214 .name = TYPE_TPM_IF, 215 .parent = TYPE_INTERFACE, 216 .class_size = sizeof(TPMIfClass), 217 }; 218 219 static void register_types(void) 220 { 221 type_register_static(&tpm_backend_info); 222 type_register_static(&tpm_if_info); 223 } 224 225 type_init(register_types); 226