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