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 "sysemu/tpm_backend.h"
  16 #include "qapi/qmp/qerror.h"
  17 #include "sysemu/tpm.h"
  18 #include "qemu/thread.h"
  19 #include "sysemu/tpm_backend_int.h"
  20
  21 enum TpmType tpm_backend_get_type(TPMBackend *s)
  22 {
  23     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
  24
  25     return k->ops->type;
  26 }
  27
  28 const char *tpm_backend_get_desc(TPMBackend *s)
  29 {
  30     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
  31
  32     return k->ops->desc();
  33 }
  34
  35 void tpm_backend_destroy(TPMBackend *s)
  36 {
  37     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
  38
  39     return k->ops->destroy(s);
  40 }
  41
  42 int tpm_backend_init(TPMBackend *s, TPMState *state,
  43                      TPMRecvDataCB *datacb)
  44 {
  45     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
  46
  47     return k->ops->init(s, state, datacb);
  48 }
  49
  50 int tpm_backend_startup_tpm(TPMBackend *s)
  51 {
  52     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
  53
  54     return k->ops->startup_tpm(s);
  55 }
  56
  57 bool tpm_backend_had_startup_error(TPMBackend *s)
  58 {
  59     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
  60
  61     return k->ops->had_startup_error(s);
  62 }
  63
  64 size_t tpm_backend_realloc_buffer(TPMBackend *s, TPMSizedBuffer *sb)
  65 {
  66     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
  67
  68     return k->ops->realloc_buffer(sb);
  69 }
  70
  71 void tpm_backend_deliver_request(TPMBackend *s)
  72 {
  73     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
  74
  75     k->ops->deliver_request(s);
  76 }
  77
  78 void tpm_backend_reset(TPMBackend *s)
  79 {
  80     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
  81
  82     k->ops->reset(s);
  83 }
  84
  85 void tpm_backend_cancel_cmd(TPMBackend *s)
  86 {
  87     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
  88
  89     k->ops->cancel_cmd(s);
  90 }
  91
  92 bool tpm_backend_get_tpm_established_flag(TPMBackend *s)
  93 {
  94     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
  95
  96     return k->ops->get_tpm_established_flag(s);
  97 }
  98
  99 static bool tpm_backend_prop_get_opened(Object *obj, Error **errp)
 100 {
 101     TPMBackend *s = TPM_BACKEND(obj);
 102
 103     return s->opened;
 104 }
 105
 106 void tpm_backend_open(TPMBackend *s, Error **errp)
 107 {
 108     object_property_set_bool(OBJECT(s), true, "opened", errp);
 109 }
 110
 111 static void tpm_backend_prop_set_opened(Object *obj, bool value, Error **errp)
 112 {
 113     TPMBackend *s = TPM_BACKEND(obj);
 114     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
 115
 116     if (value == s->opened) {
 117         return;
 118     }
 119
 120     if (!value && s->opened) {
 121         error_set(errp, QERR_PERMISSION_DENIED);
 122         return;
 123     }
 124
 125     if (k->opened) {
 126         k->opened(s, errp);
 127     }
 128
 129     if (!error_is_set(errp)) {
 130         s->opened = value;
 131     }
 132 }
 133
 134 static void tpm_backend_instance_init(Object *obj)
 135 {
 136     object_property_add_bool(obj, "opened",
 137                              tpm_backend_prop_get_opened,
 138                              tpm_backend_prop_set_opened,
 139                              NULL);
 140 }
 141
 142 void tpm_backend_thread_deliver_request(TPMBackendThread *tbt)
 143 {
 144    g_thread_pool_push(tbt->pool, (gpointer)TPM_BACKEND_CMD_PROCESS_CMD, NULL);
 145 }
 146
 147 void tpm_backend_thread_create(TPMBackendThread *tbt,
 148                                GFunc func, gpointer user_data)
 149 {
 150     if (!tbt->pool) {
 151         tbt->pool = g_thread_pool_new(func, user_data, 1, TRUE, NULL);
 152         g_thread_pool_push(tbt->pool, (gpointer)TPM_BACKEND_CMD_INIT, NULL);
 153     }
 154 }
 155
 156 void tpm_backend_thread_end(TPMBackendThread *tbt)
 157 {
 158     if (tbt->pool) {
 159         g_thread_pool_push(tbt->pool, (gpointer)TPM_BACKEND_CMD_END, NULL);
 160         g_thread_pool_free(tbt->pool, FALSE, TRUE);
 161         tbt->pool = NULL;
 162     }
 163 }
 164
 165 void tpm_backend_thread_tpm_reset(TPMBackendThread *tbt,
 166                                   GFunc func, gpointer user_data)
 167 {
 168     if (!tbt->pool) {
 169         tpm_backend_thread_create(tbt, func, user_data);
 170     } else {
 171         g_thread_pool_push(tbt->pool, (gpointer)TPM_BACKEND_CMD_TPM_RESET,
 172                            NULL);
 173     }
 174 }
 175
 176 static const TypeInfo tpm_backend_info = {
 177     .name = TYPE_TPM_BACKEND,
 178     .parent = TYPE_OBJECT,
 179     .instance_size = sizeof(TPMBackend),
 180     .instance_init = tpm_backend_instance_init,
 181     .class_size = sizeof(TPMBackendClass),
 182     .abstract = true,
 183 };
 184
 185 static void register_types(void)
 186 {
 187     type_register_static(&tpm_backend_info);
 188 }
 189
 190 type_init(register_types);