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 const char *tpm_backend_get_desc(TPMBackend *s)
  48 {
  49     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
  50
  51     return k->ops->desc();
  52 }
  53
  54 int tpm_backend_init(TPMBackend *s, TPMState *state,
  55                      TPMRecvDataCB *datacb)
  56 {
  57     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
  58
  59     s->tpm_state = state;
  60     s->recv_data_callback = datacb;
  61
  62     return k->ops->init(s);
  63 }
  64
  65 int tpm_backend_startup_tpm(TPMBackend *s)
  66 {
  67     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
  68
  69     /* terminate a running TPM */
  70     tpm_backend_thread_end(s);
  71
  72     s->thread_pool = g_thread_pool_new(tpm_backend_worker_thread, s, 1, TRUE,
  73                                        NULL);
  74     g_thread_pool_push(s->thread_pool, (gpointer)TPM_BACKEND_CMD_INIT, NULL);
  75
  76     return k->ops->startup_tpm(s);
  77 }
  78
  79 bool tpm_backend_had_startup_error(TPMBackend *s)
  80 {
  81     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
  82
  83     return k->ops->had_startup_error(s);
  84 }
  85
  86 size_t tpm_backend_realloc_buffer(TPMBackend *s, TPMSizedBuffer *sb)
  87 {
  88     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
  89
  90     return k->ops->realloc_buffer(sb);
  91 }
  92
  93 void tpm_backend_deliver_request(TPMBackend *s)
  94 {
  95     g_thread_pool_push(s->thread_pool, (gpointer)TPM_BACKEND_CMD_PROCESS_CMD,
  96                        NULL);
  97 }
  98
  99 void tpm_backend_reset(TPMBackend *s)
 100 {
 101     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
 102
 103     k->ops->reset(s);
 104
 105     tpm_backend_thread_end(s);
 106 }
 107
 108 void tpm_backend_cancel_cmd(TPMBackend *s)
 109 {
 110     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
 111
 112     k->ops->cancel_cmd(s);
 113 }
 114
 115 bool tpm_backend_get_tpm_established_flag(TPMBackend *s)
 116 {
 117     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
 118
 119     return k->ops->get_tpm_established_flag(s);
 120 }
 121
 122 int tpm_backend_reset_tpm_established_flag(TPMBackend *s, uint8_t locty)
 123 {
 124     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
 125
 126     return k->ops->reset_tpm_established_flag(s, locty);
 127 }
 128
 129 TPMVersion tpm_backend_get_tpm_version(TPMBackend *s)
 130 {
 131     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
 132
 133     return k->ops->get_tpm_version(s);
 134 }
 135
 136 static bool tpm_backend_prop_get_opened(Object *obj, Error **errp)
 137 {
 138     TPMBackend *s = TPM_BACKEND(obj);
 139
 140     return s->opened;
 141 }
 142
 143 void tpm_backend_open(TPMBackend *s, Error **errp)
 144 {
 145     object_property_set_bool(OBJECT(s), true, "opened", errp);
 146 }
 147
 148 static void tpm_backend_prop_set_opened(Object *obj, bool value, Error **errp)
 149 {
 150     TPMBackend *s = TPM_BACKEND(obj);
 151     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
 152     Error *local_err = NULL;
 153
 154     if (value == s->opened) {
 155         return;
 156     }
 157
 158     if (!value && s->opened) {
 159         error_setg(errp, QERR_PERMISSION_DENIED);
 160         return;
 161     }
 162
 163     if (k->opened) {
 164         k->opened(s, &local_err);
 165         if (local_err) {
 166             error_propagate(errp, local_err);
 167             return;
 168         }
 169     }
 170
 171     s->opened = true;
 172 }
 173
 174 static void tpm_backend_instance_init(Object *obj)
 175 {
 176     TPMBackend *s = TPM_BACKEND(obj);
 177
 178     object_property_add_bool(obj, "opened",
 179                              tpm_backend_prop_get_opened,
 180                              tpm_backend_prop_set_opened,
 181                              NULL);
 182     s->fe_model = -1;
 183 }
 184
 185 static void tpm_backend_instance_finalize(Object *obj)
 186 {
 187     TPMBackend *s = TPM_BACKEND(obj);
 188
 189     g_free(s->id);
 190     g_free(s->path);
 191     g_free(s->cancel_path);
 192     tpm_backend_thread_end(s);
 193 }
 194
 195 static const TypeInfo tpm_backend_info = {
 196     .name = TYPE_TPM_BACKEND,
 197     .parent = TYPE_OBJECT,
 198     .instance_size = sizeof(TPMBackend),
 199     .instance_init = tpm_backend_instance_init,
 200     .instance_finalize = tpm_backend_instance_finalize,
 201     .class_size = sizeof(TPMBackendClass),
 202     .abstract = true,
 203 };
 204
 205 static void register_types(void)
 206 {
 207     type_register_static(&tpm_backend_info);
 208 }
 209
 210 type_init(register_types);