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