| 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 "system/tpm_backend.h" |
| 21 | #include "system/tpm.h" |
| 22 | #include "qemu/config-file.h" |
| 23 | #include "qemu/error-report.h" |
| 24 | #include "qemu/help_option.h" |
| 25 | |
| 26 | static QLIST_HEAD(, TPMBackend) tpm_backends = |
| 27 | QLIST_HEAD_INITIALIZER(tpm_backends); |
| 28 | |
| 29 | static const TPMBackendClass * |
| 30 | tpm_be_find_by_type(enum TpmType type) |
| 31 | { |
| 32 | ObjectClass *oc; |
| 33 | char *typename = g_strdup_printf("tpm-%s", TpmType_str(type)); |
| 34 | |
| 35 | oc = object_class_by_name(typename); |
| 36 | g_free(typename); |
| 37 | |
| 38 | if (!object_class_dynamic_cast(oc, TYPE_TPM_BACKEND)) { |
| 39 | return NULL; |
| 40 | } |
| 41 | |
| 42 | return TPM_BACKEND_CLASS(oc); |
| 43 | } |
| 44 | |
| 45 | /* |
| 46 | * Walk the list of available TPM backend drivers and display them on the |
| 47 | * screen. |
| 48 | */ |
| 49 | static void tpm_display_backend_drivers(void) |
| 50 | { |
| 51 | bool got_one = false; |
| 52 | int i; |
| 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 | if (!got_one) { |
| 60 | error_printf("Supported TPM types (choose only one):\n"); |
| 61 | got_one = true; |
| 62 | } |
| 63 | error_printf("%12s %s\n", TpmType_str(i), bc->desc); |
| 64 | } |
| 65 | if (!got_one) { |
| 66 | error_printf("No TPM backend types are available\n"); |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | /* |
| 71 | * Find the TPM with the given Id |
| 72 | */ |
| 73 | TPMBackend *qemu_find_tpm_be(const char *id) |
| 74 | { |
| 75 | TPMBackend *drv; |
| 76 | |
| 77 | if (id) { |
| 78 | QLIST_FOREACH(drv, &tpm_backends, list) { |
| 79 | if (!strcmp(drv->id, id)) { |
| 80 | return drv; |
| 81 | } |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | return NULL; |
| 86 | } |
| 87 | |
| 88 | static int tpm_init_tpmdev(void *dummy, QemuOpts *opts, Error **errp) |
| 89 | { |
| 90 | /* |
| 91 | * Use of error_report() in a function with an Error ** parameter |
| 92 | * is suspicious. It is okay here. The parameter only exists to |
| 93 | * make the function usable with qemu_opts_foreach(). It is not |
| 94 | * actually used. |
| 95 | */ |
| 96 | const char *value; |
| 97 | const char *id; |
| 98 | const TPMBackendClass *be; |
| 99 | TPMBackend *drv; |
| 100 | Error *local_err = NULL; |
| 101 | int i; |
| 102 | |
| 103 | if (!QLIST_EMPTY(&tpm_backends)) { |
| 104 | error_report("Only one TPM is allowed."); |
| 105 | return 1; |
| 106 | } |
| 107 | |
| 108 | id = qemu_opts_id(opts); |
| 109 | if (id == NULL) { |
| 110 | error_report(QERR_MISSING_PARAMETER, "id"); |
| 111 | return 1; |
| 112 | } |
| 113 | |
| 114 | value = qemu_opt_get(opts, "type"); |
| 115 | if (!value) { |
| 116 | error_report(QERR_MISSING_PARAMETER, "type"); |
| 117 | tpm_display_backend_drivers(); |
| 118 | return 1; |
| 119 | } |
| 120 | |
| 121 | i = qapi_enum_parse(&TpmType_lookup, value, -1, NULL); |
| 122 | be = i >= 0 ? tpm_be_find_by_type(i) : NULL; |
| 123 | if (be == NULL) { |
| 124 | error_report(QERR_INVALID_PARAMETER_VALUE, |
| 125 | "type", "a TPM backend type"); |
| 126 | tpm_display_backend_drivers(); |
| 127 | return 1; |
| 128 | } |
| 129 | |
| 130 | /* validate backend specific opts */ |
| 131 | if (!qemu_opts_validate(opts, be->opts, &local_err)) { |
| 132 | error_report_err(local_err); |
| 133 | return 1; |
| 134 | } |
| 135 | |
| 136 | drv = be->create(opts); |
| 137 | if (!drv) { |
| 138 | return 1; |
| 139 | } |
| 140 | |
| 141 | drv->id = g_strdup(id); |
| 142 | QLIST_INSERT_HEAD(&tpm_backends, drv, list); |
| 143 | |
| 144 | return 0; |
| 145 | } |
| 146 | |
| 147 | /* |
| 148 | * Walk the list of TPM backend drivers that are in use and call their |
| 149 | * destroy function to have them cleaned up. |
| 150 | */ |
| 151 | void tpm_cleanup(void) |
| 152 | { |
| 153 | TPMBackend *drv, *next; |
| 154 | |
| 155 | QLIST_FOREACH_SAFE(drv, &tpm_backends, list, next) { |
| 156 | QLIST_REMOVE(drv, list); |
| 157 | object_unref(OBJECT(drv)); |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | /* |
| 162 | * Initialize the TPM. Process the tpmdev command line options describing the |
| 163 | * TPM backend. |
| 164 | */ |
| 165 | int tpm_init(void) |
| 166 | { |
| 167 | if (qemu_opts_foreach(qemu_find_opts("tpmdev"), |
| 168 | tpm_init_tpmdev, NULL, NULL)) { |
| 169 | return -1; |
| 170 | } |
| 171 | |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | /* |
| 176 | * Parse the TPM configuration options. |
| 177 | * To display all available TPM backends the user may use '-tpmdev help' |
| 178 | */ |
| 179 | int tpm_config_parse(QemuOptsList *opts_list, const char *optstr) |
| 180 | { |
| 181 | QemuOpts *opts; |
| 182 | |
| 183 | if (is_help_option(optstr)) { |
| 184 | tpm_display_backend_drivers(); |
| 185 | exit(EXIT_SUCCESS); |
| 186 | } |
| 187 | opts = qemu_opts_parse_noisily(opts_list, optstr, true); |
| 188 | if (!opts) { |
| 189 | return -1; |
| 190 | } |
| 191 | return 0; |
| 192 | } |
| 193 | |
| 194 | /* |
| 195 | * Walk the list of active TPM backends and collect information about them. |
| 196 | */ |
| 197 | TPMInfoList *qmp_query_tpm(Error **errp) |
| 198 | { |
| 199 | TPMBackend *drv; |
| 200 | TPMInfoList *head = NULL, **tail = &head; |
| 201 | |
| 202 | QLIST_FOREACH(drv, &tpm_backends, list) { |
| 203 | if (!drv->tpmif) { |
| 204 | continue; |
| 205 | } |
| 206 | |
| 207 | QAPI_LIST_APPEND(tail, tpm_backend_query_tpm(drv)); |
| 208 | } |
| 209 | |
| 210 | return head; |
| 211 | } |
| 212 | |
| 213 | TpmTypeList *qmp_query_tpm_types(Error **errp) |
| 214 | { |
| 215 | unsigned int i = 0; |
| 216 | TpmTypeList *head = NULL, **tail = &head; |
| 217 | |
| 218 | for (i = 0; i < TPM_TYPE__MAX; i++) { |
| 219 | if (!tpm_be_find_by_type(i)) { |
| 220 | continue; |
| 221 | } |
| 222 | QAPI_LIST_APPEND(tail, i); |
| 223 | } |
| 224 | |
| 225 | return head; |
| 226 | } |
| 227 | TpmModelList *qmp_query_tpm_models(Error **errp) |
| 228 | { |
| 229 | TpmModelList *head = NULL, **tail = &head; |
| 230 | GSList *e, *l = object_class_get_list(TYPE_TPM_IF, false); |
| 231 | |
| 232 | for (e = l; e; e = e->next) { |
| 233 | TPMIfClass *c = TPM_IF_CLASS(e->data); |
| 234 | |
| 235 | QAPI_LIST_APPEND(tail, c->model); |
| 236 | } |
| 237 | g_slist_free(l); |
| 238 | |
| 239 | return head; |
| 240 | } |