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     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     Error *local_err = NULL;
 116
 117     if (value == s->opened) {
 118         return;
 119     }
 120
 121     if (!value && s->opened) {
 122         error_set(errp, QERR_PERMISSION_DENIED);
 123         return;
 124     }
 125
 126     if (k->opened) {
 127         k->opened(s, &local_err);
 128         if (local_err) {
 129             error_propagate(errp, local_err);
 130             return;
 131         }
 132     }
 133
 134     s->opened = true;
 135 }
 136
 137 static void tpm_backend_instance_init(Object *obj)
 138 {
 139     object_property_add_bool(obj, "opened",
 140                              tpm_backend_prop_get_opened,
 141                              tpm_backend_prop_set_opened,
 142                              NULL);
 143 }
 144
 145 void tpm_backend_thread_deliver_request(TPMBackendThread *tbt)
 146 {
 147    g_thread_pool_push(tbt->pool, (gpointer)TPM_BACKEND_CMD_PROCESS_CMD, NULL);
 148 }
 149
 150 void tpm_backend_thread_create(TPMBackendThread *tbt,
 151                                GFunc func, gpointer user_data)
 152 {
 153     if (!tbt->pool) {
 154         tbt->pool = g_thread_pool_new(func, user_data, 1, TRUE, NULL);
 155         g_thread_pool_push(tbt->pool, (gpointer)TPM_BACKEND_CMD_INIT, NULL);
 156     }
 157 }
 158
 159 void tpm_backend_thread_end(TPMBackendThread *tbt)
 160 {
 161     if (tbt->pool) {
 162         g_thread_pool_push(tbt->pool, (gpointer)TPM_BACKEND_CMD_END, NULL);
 163         g_thread_pool_free(tbt->pool, FALSE, TRUE);
 164         tbt->pool = NULL;
 165     }
 166 }
 167
 168 void tpm_backend_thread_tpm_reset(TPMBackendThread *tbt,
 169                                   GFunc func, gpointer user_data)
 170 {
 171     if (!tbt->pool) {
 172         tpm_backend_thread_create(tbt, func, user_data);
 173     } else {
 174         g_thread_pool_push(tbt->pool, (gpointer)TPM_BACKEND_CMD_TPM_RESET,
 175                            NULL);
 176     }
 177 }
 178
 179 static const TypeInfo tpm_backend_info = {
 180     .name = TYPE_TPM_BACKEND,
 181     .parent = TYPE_OBJECT,
 182     .instance_size = sizeof(TPMBackend),
 183     .instance_init = tpm_backend_instance_init,
 184     .class_size = sizeof(TPMBackendClass),
 185     .abstract = true,
 186 };
 187
 188 static void register_types(void)
 189 {
 190     type_register_static(&tpm_backend_info);
 191 }
 192
 193 type_init(register_types);