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 "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);