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 #include "qemu/main-loop.h" 22 23 static void tpm_backend_request_completed_bh(void *opaque) 24 { 25 TPMBackend *s = TPM_BACKEND(opaque); 26 TPMIfClass *tic = TPM_IF_GET_CLASS(s->tpmif); 27 28 tic->request_completed(s->tpmif); 29 } 30 31 static void tpm_backend_worker_thread(gpointer data, gpointer user_data) 32 { 33 TPMBackend *s = TPM_BACKEND(user_data); 34 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); 35 36 assert(k->handle_request != NULL); 37 k->handle_request(s, (TPMBackendCmd *)data); 38 39 qemu_bh_schedule(s->bh); 40 } 41 42 static void tpm_backend_thread_end(TPMBackend *s) 43 { 44 if (s->thread_pool) { 45 g_thread_pool_free(s->thread_pool, FALSE, TRUE); 46 s->thread_pool = NULL; 47 } 48 } 49 50 enum TpmType tpm_backend_get_type(TPMBackend *s) 51 { 52 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); 53 54 return k->type; 55 } 56 57 int tpm_backend_init(TPMBackend *s, TPMIf *tpmif, Error **errp) 58 { 59 if (s->tpmif) { 60 error_setg(errp, "TPM backend '%s' is already initialized", s->id); 61 return -1; 62 } 63 64 s->tpmif = tpmif; 65 object_ref(OBJECT(tpmif)); 66 67 s->had_startup_error = false; 68 69 return 0; 70 } 71 72 int tpm_backend_startup_tpm(TPMBackend *s) 73 { 74 int res = 0; 75 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); 76 77 /* terminate a running TPM */ 78 tpm_backend_thread_end(s); 79 80 s->thread_pool = g_thread_pool_new(tpm_backend_worker_thread, s, 1, TRUE, 81 NULL); 82 83 res = k->startup_tpm ? k->startup_tpm(s) : 0; 84 85 s->had_startup_error = (res != 0); 86 87 return res; 88 } 89 90 bool tpm_backend_had_startup_error(TPMBackend *s) 91 { 92 return s->had_startup_error; 93 } 94 95 void tpm_backend_deliver_request(TPMBackend *s, TPMBackendCmd *cmd) 96 { 97 g_thread_pool_push(s->thread_pool, cmd, NULL); 98 } 99 100 void tpm_backend_reset(TPMBackend *s) 101 { 102 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); 103 104 if (k->reset) { 105 k->reset(s); 106 } 107 108 tpm_backend_thread_end(s); 109 110 s->had_startup_error = false; 111 } 112 113 void tpm_backend_cancel_cmd(TPMBackend *s) 114 { 115 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); 116 117 assert(k->cancel_cmd); 118 119 k->cancel_cmd(s); 120 } 121 122 bool tpm_backend_get_tpm_established_flag(TPMBackend *s) 123 { 124 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); 125 126 return k->get_tpm_established_flag ? 127 k->get_tpm_established_flag(s) : false; 128 } 129 130 int tpm_backend_reset_tpm_established_flag(TPMBackend *s, uint8_t locty) 131 { 132 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); 133 134 return k->reset_tpm_established_flag ? 135 k->reset_tpm_established_flag(s, locty) : 0; 136 } 137 138 TPMVersion tpm_backend_get_tpm_version(TPMBackend *s) 139 { 140 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); 141 142 assert(k->get_tpm_version); 143 144 return k->get_tpm_version(s); 145 } 146 147 TPMInfo *tpm_backend_query_tpm(TPMBackend *s) 148 { 149 TPMInfo *info = g_new0(TPMInfo, 1); 150 TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s); 151 TPMIfClass *tic = TPM_IF_GET_CLASS(s->tpmif); 152 153 info->id = g_strdup(s->id); 154 info->model = tic->model; 155 if (k->get_tpm_options) { 156 info->options = k->get_tpm_options(s); 157 } 158 159 return info; 160 } 161 162 static void tpm_backend_instance_init(Object *obj) 163 { 164 TPMBackend *s = TPM_BACKEND(obj); 165 166 s->bh = qemu_bh_new(tpm_backend_request_completed_bh, s); 167 } 168 169 static void tpm_backend_instance_finalize(Object *obj) 170 { 171 TPMBackend *s = TPM_BACKEND(obj); 172 173 object_unref(OBJECT(s->tpmif)); 174 g_free(s->id); 175 tpm_backend_thread_end(s); 176 qemu_bh_delete(s->bh); 177 } 178 179 static const TypeInfo tpm_backend_info = { 180 .name = TYPE_TPM_BACKEND, 181 .parent = TYPE_OBJECT, 182 .instance_size = sizeof(TPMBackend), 183 .instance_init = tpm_backend_instance_init, 184 .instance_finalize = tpm_backend_instance_finalize, 185 .class_size = sizeof(TPMBackendClass), 186 .abstract = true, 187 }; 188 189 static const TypeInfo tpm_if_info = { 190 .name = TYPE_TPM_IF, 191 .parent = TYPE_INTERFACE, 192 .class_size = sizeof(TPMIfClass), 193 }; 194 195 static void register_types(void) 196 { 197 type_register_static(&tpm_backend_info); 198 type_register_static(&tpm_if_info); 199 } 200 201 type_init(register_types); 202