tpm.c

   1 /*
   2  * TPM configuration
   3  *
   4  * Copyright (C) 2011-2013 IBM Corporation
   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 net.c
  13  */
  14
  15 #include "qemu/osdep.h"
  16
  17 #include "qapi/error.h"
  18 #include "qapi/qapi-commands-tpm.h"
  19 #include "qapi/qmp/qerror.h"
  20 #include "sysemu/tpm_backend.h"
  21 #include "sysemu/tpm.h"
  22 #include "qemu/config-file.h"
  23 #include "qemu/error-report.h"
  24
  25 static QLIST_HEAD(, TPMBackend) tpm_backends =
  26     QLIST_HEAD_INITIALIZER(tpm_backends);
  27
  28 static const TPMBackendClass *
  29 tpm_be_find_by_type(enum TpmType type)
  30 {
  31     ObjectClass *oc;
  32     char *typename = g_strdup_printf("tpm-%s", TpmType_str(type));
  33
  34     oc = object_class_by_name(typename);
  35     g_free(typename);
  36
  37     if (!object_class_dynamic_cast(oc, TYPE_TPM_BACKEND)) {
  38         return NULL;
  39     }
  40
  41     return TPM_BACKEND_CLASS(oc);
  42 }
  43
  44 /*
  45  * Walk the list of available TPM backend drivers and display them on the
  46  * screen.
  47  */
  48 static void tpm_display_backend_drivers(void)
  49 {
  50     int i;
  51
  52     fprintf(stderr, "Supported TPM types (choose only one):\n");
  53
  54     for (i = 0; i < TPM_TYPE__MAX; i++) {
  55         const TPMBackendClass *bc = tpm_be_find_by_type(i);
  56         if (!bc) {
  57             continue;
  58         }
  59         fprintf(stderr, "%12s   %s\n", TpmType_str(i), bc->desc);
  60     }
  61     fprintf(stderr, "\n");
  62 }
  63
  64 /*
  65  * Find the TPM with the given Id
  66  */
  67 TPMBackend *qemu_find_tpm_be(const char *id)
  68 {
  69     TPMBackend *drv;
  70
  71     if (id) {
  72         QLIST_FOREACH(drv, &tpm_backends, list) {
  73             if (!strcmp(drv->id, id)) {
  74                 return drv;
  75             }
  76         }
  77     }
  78
  79     return NULL;
  80 }
  81
  82 static int tpm_init_tpmdev(void *dummy, QemuOpts *opts, Error **errp)
  83 {
  84     const char *value;
  85     const char *id;
  86     const TPMBackendClass *be;
  87     TPMBackend *drv;
  88     int i;
  89
  90     if (!QLIST_EMPTY(&tpm_backends)) {
  91         error_setg(errp, "Only one TPM is allowed.");
  92         return 1;
  93     }
  94
  95     id = qemu_opts_id(opts);
  96     if (id == NULL) {
  97         error_setg(errp, QERR_MISSING_PARAMETER, "id");
  98         return 1;
  99     }
 100
 101     value = qemu_opt_get(opts, "type");
 102     if (!value) {
 103         error_setg(errp, QERR_MISSING_PARAMETER, "type");
 104         tpm_display_backend_drivers();
 105         return 1;
 106     }
 107
 108     i = qapi_enum_parse(&TpmType_lookup, value, -1, NULL);
 109     be = i >= 0 ? tpm_be_find_by_type(i) : NULL;
 110     if (be == NULL) {
 111         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 112                    "a TPM backend type");
 113         tpm_display_backend_drivers();
 114         return 1;
 115     }
 116
 117     /* validate backend specific opts */
 118     if (!qemu_opts_validate(opts, be->opts, errp)) {
 119         return 1;
 120     }
 121
 122     drv = be->create(opts);
 123     if (!drv) {
 124         return 1;
 125     }
 126
 127     drv->id = g_strdup(id);
 128     QLIST_INSERT_HEAD(&tpm_backends, drv, list);
 129
 130     return 0;
 131 }
 132
 133 /*
 134  * Walk the list of TPM backend drivers that are in use and call their
 135  * destroy function to have them cleaned up.
 136  */
 137 void tpm_cleanup(void)
 138 {
 139     TPMBackend *drv, *next;
 140
 141     QLIST_FOREACH_SAFE(drv, &tpm_backends, list, next) {
 142         QLIST_REMOVE(drv, list);
 143         object_unref(OBJECT(drv));
 144     }
 145 }
 146
 147 /*
 148  * Initialize the TPM. Process the tpmdev command line options describing the
 149  * TPM backend.
 150  */
 151 void tpm_init(void)
 152 {
 153     qemu_opts_foreach(qemu_find_opts("tpmdev"),
 154                       tpm_init_tpmdev, NULL, &error_fatal);
 155 }
 156
 157 /*
 158  * Parse the TPM configuration options.
 159  * To display all available TPM backends the user may use '-tpmdev help'
 160  */
 161 int tpm_config_parse(QemuOptsList *opts_list, const char *optarg)
 162 {
 163     QemuOpts *opts;
 164
 165     if (!strcmp(optarg, "help")) {
 166         tpm_display_backend_drivers();
 167         return -1;
 168     }
 169     opts = qemu_opts_parse_noisily(opts_list, optarg, true);
 170     if (!opts) {
 171         return -1;
 172     }
 173     return 0;
 174 }
 175
 176 /*
 177  * Walk the list of active TPM backends and collect information about them.
 178  */
 179 TPMInfoList *qmp_query_tpm(Error **errp)
 180 {
 181     TPMBackend *drv;
 182     TPMInfoList *info, *head = NULL, *cur_item = NULL;
 183
 184     QLIST_FOREACH(drv, &tpm_backends, list) {
 185         if (!drv->tpmif) {
 186             continue;
 187         }
 188
 189         info = g_new0(TPMInfoList, 1);
 190         info->value = tpm_backend_query_tpm(drv);
 191
 192         if (!cur_item) {
 193             head = cur_item = info;
 194         } else {
 195             cur_item->next = info;
 196             cur_item = info;
 197         }
 198     }
 199
 200     return head;
 201 }
 202
 203 TpmTypeList *qmp_query_tpm_types(Error **errp)
 204 {
 205     unsigned int i = 0;
 206     TpmTypeList *head = NULL, *prev = NULL, *cur_item;
 207
 208     for (i = 0; i < TPM_TYPE__MAX; i++) {
 209         if (!tpm_be_find_by_type(i)) {
 210             continue;
 211         }
 212         cur_item = g_new0(TpmTypeList, 1);
 213         cur_item->value = i;
 214
 215         if (prev) {
 216             prev->next = cur_item;
 217         }
 218         if (!head) {
 219             head = cur_item;
 220         }
 221         prev = cur_item;
 222     }
 223
 224     return head;
 225 }
 226 TpmModelList *qmp_query_tpm_models(Error **errp)
 227 {
 228     TpmModelList *head = NULL, *prev = NULL, *cur_item;
 229     GSList *e, *l = object_class_get_list(TYPE_TPM_IF, false);
 230
 231     for (e = l; e; e = e->next) {
 232         TPMIfClass *c = TPM_IF_CLASS(e->data);
 233
 234         cur_item = g_new0(TpmModelList, 1);
 235         cur_item->value = c->model;
 236
 237         if (prev) {
 238             prev->next = cur_item;
 239         }
 240         if (!head) {
 241             head = cur_item;
 242         }
 243         prev = cur_item;
 244     }
 245     g_slist_free(l);
 246
 247     return head;
 248 }