backends/tpm.c

   1 /*
   2  * QEMU TPM Backend
   3  *
   4  * Copyright IBM, Corp. 2013
   5  *
   6  * Authors:
   7  *  Stefan Berger   <[email protected]>
   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_free(s->thread_pool, FALSE, TRUE);
  35         s->thread_pool = NULL;
  36     }
  37 }
  38
  39 enum TpmType tpm_backend_get_type(TPMBackend *s)
  40 {
  41     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
  42
  43     return k->type;
  44 }
  45
  46 int tpm_backend_init(TPMBackend *s, TPMState *state)
  47 {
  48     s->tpm_state = state;
  49     s->had_startup_error = false;
  50
  51     return 0;
  52 }
  53
  54 int tpm_backend_startup_tpm(TPMBackend *s)
  55 {
  56     int res = 0;
  57     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
  58
  59     /* terminate a running TPM */
  60     tpm_backend_thread_end(s);
  61
  62     s->thread_pool = g_thread_pool_new(tpm_backend_worker_thread, s, 1, TRUE,
  63                                        NULL);
  64
  65     res = k->startup_tpm ? k->startup_tpm(s) : 0;
  66
  67     s->had_startup_error = (res != 0);
  68
  69     return res;
  70 }
  71
  72 bool tpm_backend_had_startup_error(TPMBackend *s)
  73 {
  74     return s->had_startup_error;
  75 }
  76
  77 void tpm_backend_deliver_request(TPMBackend *s, TPMBackendCmd *cmd)
  78 {
  79     g_thread_pool_push(s->thread_pool, cmd, NULL);
  80 }
  81
  82 void tpm_backend_reset(TPMBackend *s)
  83 {
  84     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
  85
  86     if (k->reset) {
  87         k->reset(s);
  88     }
  89
  90     tpm_backend_thread_end(s);
  91
  92     s->had_startup_error = false;
  93 }
  94
  95 void tpm_backend_cancel_cmd(TPMBackend *s)
  96 {
  97     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
  98
  99     assert(k->cancel_cmd);
 100
 101     k->cancel_cmd(s);
 102 }
 103
 104 bool tpm_backend_get_tpm_established_flag(TPMBackend *s)
 105 {
 106     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
 107
 108     return k->get_tpm_established_flag ?
 109            k->get_tpm_established_flag(s) : false;
 110 }
 111
 112 int tpm_backend_reset_tpm_established_flag(TPMBackend *s, uint8_t locty)
 113 {
 114     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
 115
 116     return k->reset_tpm_established_flag ?
 117            k->reset_tpm_established_flag(s, locty) : 0;
 118 }
 119
 120 TPMVersion tpm_backend_get_tpm_version(TPMBackend *s)
 121 {
 122     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
 123
 124     assert(k->get_tpm_version);
 125
 126     return k->get_tpm_version(s);
 127 }
 128
 129 TPMInfo *tpm_backend_query_tpm(TPMBackend *s)
 130 {
 131     TPMInfo *info = g_new0(TPMInfo, 1);
 132     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
 133
 134     info->id = g_strdup(s->id);
 135     info->model = s->fe_model;
 136     if (k->get_tpm_options) {
 137         info->options = k->get_tpm_options(s);
 138     }
 139
 140     return info;
 141 }
 142
 143 static bool tpm_backend_prop_get_opened(Object *obj, Error **errp)
 144 {
 145     TPMBackend *s = TPM_BACKEND(obj);
 146
 147     return s->opened;
 148 }
 149
 150 void tpm_backend_open(TPMBackend *s, Error **errp)
 151 {
 152     object_property_set_bool(OBJECT(s), true, "opened", errp);
 153 }
 154
 155 static void tpm_backend_prop_set_opened(Object *obj, bool value, Error **errp)
 156 {
 157     TPMBackend *s = TPM_BACKEND(obj);
 158     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
 159     Error *local_err = NULL;
 160
 161     if (value == s->opened) {
 162         return;
 163     }
 164
 165     if (!value && s->opened) {
 166         error_setg(errp, QERR_PERMISSION_DENIED);
 167         return;
 168     }
 169
 170     if (k->opened) {
 171         k->opened(s, &local_err);
 172         if (local_err) {
 173             error_propagate(errp, local_err);
 174             return;
 175         }
 176     }
 177
 178     s->opened = true;
 179 }
 180
 181 static void tpm_backend_instance_init(Object *obj)
 182 {
 183     TPMBackend *s = TPM_BACKEND(obj);
 184
 185     object_property_add_bool(obj, "opened",
 186                              tpm_backend_prop_get_opened,
 187                              tpm_backend_prop_set_opened,
 188                              NULL);
 189     s->fe_model = -1;
 190 }
 191
 192 static void tpm_backend_instance_finalize(Object *obj)
 193 {
 194     TPMBackend *s = TPM_BACKEND(obj);
 195
 196     g_free(s->id);
 197     tpm_backend_thread_end(s);
 198 }
 199
 200 static const TypeInfo tpm_backend_info = {
 201     .name = TYPE_TPM_BACKEND,
 202     .parent = TYPE_OBJECT,
 203     .instance_size = sizeof(TPMBackend),
 204     .instance_init = tpm_backend_instance_init,
 205     .instance_finalize = tpm_backend_instance_finalize,
 206     .class_size = sizeof(TPMBackendClass),
 207     .abstract = true,
 208 };
 209
 210 static const TypeInfo tpm_if_info = {
 211     .name = TYPE_TPM_IF,
 212     .parent = TYPE_INTERFACE,
 213     .class_size = sizeof(TPMIfClass),
 214 };
 215
 216 static void register_types(void)
 217 {
 218     type_register_static(&tpm_backend_info);
 219     type_register_static(&tpm_if_info);
 220 }
 221
 222 type_init(register_types);