backends/cryptodev-vhost-user.c

   1 /*
   2  * QEMU Cryptodev backend for QEMU cipher APIs
   3  *
   4  * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
   5  *
   6  * Authors:
   7  *    Gonglei <arei.gonglei@huawei.com>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  21  *
  22  */
  23
  24 #include "qemu/osdep.h"
  25 #include "qapi/error.h"
  26 #include "qapi/qmp/qerror.h"
  27 #include "qemu/error-report.h"
  28 #include "hw/virtio/vhost-user.h"
  29 #include "standard-headers/linux/virtio_crypto.h"
  30 #include "sysemu/cryptodev-vhost.h"
  31 #include "chardev/char-fe.h"
  32 #include "sysemu/cryptodev-vhost-user.h"
  33 #include "qom/object.h"
  34
  35
  36 /**
  37  * @TYPE_CRYPTODEV_BACKEND_VHOST_USER:
  38  * name of backend that uses vhost user server
  39  */
  40 #define TYPE_CRYPTODEV_BACKEND_VHOST_USER "cryptodev-vhost-user"
  41
  42 OBJECT_DECLARE_SIMPLE_TYPE(CryptoDevBackendVhostUser, CRYPTODEV_BACKEND_VHOST_USER)
  43
  44
  45 struct CryptoDevBackendVhostUser {
  46     CryptoDevBackend parent_obj;
  47
  48     VhostUserState vhost_user;
  49     CharBackend chr;
  50     char *chr_name;
  51     bool opened;
  52     CryptoDevBackendVhost *vhost_crypto[MAX_CRYPTO_QUEUE_NUM];
  53 };
  54
  55 static int
  56 cryptodev_vhost_user_running(
  57              CryptoDevBackendVhost *crypto)
  58 {
  59     return crypto ? 1 : 0;
  60 }
  61
  62 CryptoDevBackendVhost *
  63 cryptodev_vhost_user_get_vhost(
  64                          CryptoDevBackendClient *cc,
  65                          CryptoDevBackend *b,
  66                          uint16_t queue)
  67 {
  68     CryptoDevBackendVhostUser *s =
  69                       CRYPTODEV_BACKEND_VHOST_USER(b);
  70     assert(cc->type == CRYPTODEV_BACKEND_TYPE_VHOST_USER);
  71     assert(queue < MAX_CRYPTO_QUEUE_NUM);
  72
  73     return s->vhost_crypto[queue];
  74 }
  75
  76 static void cryptodev_vhost_user_stop(int queues,
  77                           CryptoDevBackendVhostUser *s)
  78 {
  79     size_t i;
  80
  81     for (i = 0; i < queues; i++) {
  82         if (!cryptodev_vhost_user_running(s->vhost_crypto[i])) {
  83             continue;
  84         }
  85
  86         cryptodev_vhost_cleanup(s->vhost_crypto[i]);
  87         s->vhost_crypto[i] = NULL;
  88     }
  89 }
  90
  91 static int
  92 cryptodev_vhost_user_start(int queues,
  93                          CryptoDevBackendVhostUser *s)
  94 {
  95     CryptoDevBackendVhostOptions options;
  96     CryptoDevBackend *b = CRYPTODEV_BACKEND(s);
  97     int max_queues;
  98     size_t i;
  99
 100     for (i = 0; i < queues; i++) {
 101         if (cryptodev_vhost_user_running(s->vhost_crypto[i])) {
 102             continue;
 103         }
 104
 105         options.opaque = &s->vhost_user;
 106         options.backend_type = VHOST_BACKEND_TYPE_USER;
 107         options.cc = b->conf.peers.ccs[i];
 108         s->vhost_crypto[i] = cryptodev_vhost_init(&options);
 109         if (!s->vhost_crypto[i]) {
 110             error_report("failed to init vhost_crypto for queue %zu", i);
 111             goto err;
 112         }
 113
 114         if (i == 0) {
 115             max_queues =
 116               cryptodev_vhost_get_max_queues(s->vhost_crypto[i]);
 117             if (queues > max_queues) {
 118                 error_report("you are asking more queues than supported: %d",
 119                              max_queues);
 120                 goto err;
 121             }
 122         }
 123     }
 124
 125     return 0;
 126
 127 err:
 128     cryptodev_vhost_user_stop(i + 1, s);
 129     return -1;
 130 }
 131
 132 static Chardev *
 133 cryptodev_vhost_claim_chardev(CryptoDevBackendVhostUser *s,
 134                                     Error **errp)
 135 {
 136     Chardev *chr;
 137
 138     if (s->chr_name == NULL) {
 139         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 140                    "chardev", "a valid character device");
 141         return NULL;
 142     }
 143
 144     chr = qemu_chr_find(s->chr_name);
 145     if (chr == NULL) {
 146         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 147                   "Device '%s' not found", s->chr_name);
 148         return NULL;
 149     }
 150
 151     return chr;
 152 }
 153
 154 static void cryptodev_vhost_user_event(void *opaque, QEMUChrEvent event)
 155 {
 156     CryptoDevBackendVhostUser *s = opaque;
 157     CryptoDevBackend *b = CRYPTODEV_BACKEND(s);
 158     int queues = b->conf.peers.queues;
 159
 160     assert(queues < MAX_CRYPTO_QUEUE_NUM);
 161
 162     switch (event) {
 163     case CHR_EVENT_OPENED:
 164         if (cryptodev_vhost_user_start(queues, s) < 0) {
 165             exit(1);
 166         }
 167         b->ready = true;
 168         break;
 169     case CHR_EVENT_CLOSED:
 170         b->ready = false;
 171         cryptodev_vhost_user_stop(queues, s);
 172         break;
 173     case CHR_EVENT_BREAK:
 174     case CHR_EVENT_MUX_IN:
 175     case CHR_EVENT_MUX_OUT:
 176         /* Ignore */
 177         break;
 178     }
 179 }
 180
 181 static void cryptodev_vhost_user_init(
 182              CryptoDevBackend *backend, Error **errp)
 183 {
 184     int queues = backend->conf.peers.queues;
 185     size_t i;
 186     Error *local_err = NULL;
 187     Chardev *chr;
 188     CryptoDevBackendClient *cc;
 189     CryptoDevBackendVhostUser *s =
 190                       CRYPTODEV_BACKEND_VHOST_USER(backend);
 191
 192     chr = cryptodev_vhost_claim_chardev(s, &local_err);
 193     if (local_err) {
 194         error_propagate(errp, local_err);
 195         return;
 196     }
 197
 198     s->opened = true;
 199
 200     for (i = 0; i < queues; i++) {
 201         cc = cryptodev_backend_new_client(
 202                   "cryptodev-vhost-user", NULL);
 203         cc->info_str = g_strdup_printf("cryptodev-vhost-user%zu to %s ",
 204                                        i, chr->label);
 205         cc->queue_index = i;
 206         cc->type = CRYPTODEV_BACKEND_TYPE_VHOST_USER;
 207
 208         backend->conf.peers.ccs[i] = cc;
 209
 210         if (i == 0) {
 211             if (!qemu_chr_fe_init(&s->chr, chr, errp)) {
 212                 return;
 213             }
 214         }
 215     }
 216
 217     if (!vhost_user_init(&s->vhost_user, &s->chr, errp)) {
 218         return;
 219     }
 220
 221     qemu_chr_fe_set_handlers(&s->chr, NULL, NULL,
 222                      cryptodev_vhost_user_event, NULL, s, NULL, true);
 223
 224     backend->conf.crypto_services =
 225                          1u << VIRTIO_CRYPTO_SERVICE_CIPHER |
 226                          1u << VIRTIO_CRYPTO_SERVICE_HASH |
 227                          1u << VIRTIO_CRYPTO_SERVICE_MAC;
 228     backend->conf.cipher_algo_l = 1u << VIRTIO_CRYPTO_CIPHER_AES_CBC;
 229     backend->conf.hash_algo = 1u << VIRTIO_CRYPTO_HASH_SHA1;
 230
 231     backend->conf.max_size = UINT64_MAX;
 232     backend->conf.max_cipher_key_len = VHOST_USER_MAX_CIPHER_KEY_LEN;
 233     backend->conf.max_auth_key_len = VHOST_USER_MAX_AUTH_KEY_LEN;
 234 }
 235
 236 static int64_t cryptodev_vhost_user_sym_create_session(
 237            CryptoDevBackend *backend,
 238            CryptoDevBackendSymSessionInfo *sess_info,
 239            uint32_t queue_index, Error **errp)
 240 {
 241     CryptoDevBackendClient *cc =
 242                    backend->conf.peers.ccs[queue_index];
 243     CryptoDevBackendVhost *vhost_crypto;
 244     uint64_t session_id = 0;
 245     int ret;
 246
 247     vhost_crypto = cryptodev_vhost_user_get_vhost(cc, backend, queue_index);
 248     if (vhost_crypto) {
 249         struct vhost_dev *dev = &(vhost_crypto->dev);
 250         ret = dev->vhost_ops->vhost_crypto_create_session(dev,
 251                                                           sess_info,
 252                                                           &session_id);
 253         if (ret < 0) {
 254             return -1;
 255         } else {
 256             return session_id;
 257         }
 258     }
 259     return -1;
 260 }
 261
 262 static int cryptodev_vhost_user_sym_close_session(
 263            CryptoDevBackend *backend,
 264            uint64_t session_id,
 265            uint32_t queue_index, Error **errp)
 266 {
 267     CryptoDevBackendClient *cc =
 268                   backend->conf.peers.ccs[queue_index];
 269     CryptoDevBackendVhost *vhost_crypto;
 270     int ret;
 271
 272     vhost_crypto = cryptodev_vhost_user_get_vhost(cc, backend, queue_index);
 273     if (vhost_crypto) {
 274         struct vhost_dev *dev = &(vhost_crypto->dev);
 275         ret = dev->vhost_ops->vhost_crypto_close_session(dev,
 276                                                          session_id);
 277         if (ret < 0) {
 278             return -1;
 279         } else {
 280             return 0;
 281         }
 282     }
 283     return -1;
 284 }
 285
 286 static void cryptodev_vhost_user_cleanup(
 287              CryptoDevBackend *backend,
 288              Error **errp)
 289 {
 290     CryptoDevBackendVhostUser *s =
 291                       CRYPTODEV_BACKEND_VHOST_USER(backend);
 292     size_t i;
 293     int queues = backend->conf.peers.queues;
 294     CryptoDevBackendClient *cc;
 295
 296     cryptodev_vhost_user_stop(queues, s);
 297
 298     for (i = 0; i < queues; i++) {
 299         cc = backend->conf.peers.ccs[i];
 300         if (cc) {
 301             cryptodev_backend_free_client(cc);
 302             backend->conf.peers.ccs[i] = NULL;
 303         }
 304     }
 305
 306     vhost_user_cleanup(&s->vhost_user);
 307 }
 308
 309 static void cryptodev_vhost_user_set_chardev(Object *obj,
 310                                     const char *value, Error **errp)
 311 {
 312     CryptoDevBackendVhostUser *s =
 313                       CRYPTODEV_BACKEND_VHOST_USER(obj);
 314
 315     if (s->opened) {
 316         error_setg(errp, QERR_PERMISSION_DENIED);
 317     } else {
 318         g_free(s->chr_name);
 319         s->chr_name = g_strdup(value);
 320     }
 321 }
 322
 323 static char *
 324 cryptodev_vhost_user_get_chardev(Object *obj, Error **errp)
 325 {
 326     CryptoDevBackendVhostUser *s =
 327                       CRYPTODEV_BACKEND_VHOST_USER(obj);
 328     Chardev *chr = qemu_chr_fe_get_driver(&s->chr);
 329
 330     if (chr && chr->label) {
 331         return g_strdup(chr->label);
 332     }
 333
 334     return NULL;
 335 }
 336
 337 static void cryptodev_vhost_user_finalize(Object *obj)
 338 {
 339     CryptoDevBackendVhostUser *s =
 340                       CRYPTODEV_BACKEND_VHOST_USER(obj);
 341
 342     qemu_chr_fe_deinit(&s->chr, false);
 343
 344     g_free(s->chr_name);
 345 }
 346
 347 static void
 348 cryptodev_vhost_user_class_init(ObjectClass *oc, void *data)
 349 {
 350     CryptoDevBackendClass *bc = CRYPTODEV_BACKEND_CLASS(oc);
 351
 352     bc->init = cryptodev_vhost_user_init;
 353     bc->cleanup = cryptodev_vhost_user_cleanup;
 354     bc->create_session = cryptodev_vhost_user_sym_create_session;
 355     bc->close_session = cryptodev_vhost_user_sym_close_session;
 356     bc->do_sym_op = NULL;
 357
 358     object_class_property_add_str(oc, "chardev",
 359                                   cryptodev_vhost_user_get_chardev,
 360                                   cryptodev_vhost_user_set_chardev);
 361
 362 }
 363
 364 static const TypeInfo cryptodev_vhost_user_info = {
 365     .name = TYPE_CRYPTODEV_BACKEND_VHOST_USER,
 366     .parent = TYPE_CRYPTODEV_BACKEND,
 367     .class_init = cryptodev_vhost_user_class_init,
 368     .instance_finalize = cryptodev_vhost_user_finalize,
 369     .instance_size = sizeof(CryptoDevBackendVhostUser),
 370 };
 371
 372 static void
 373 cryptodev_vhost_user_register_types(void)
 374 {
 375     type_register_static(&cryptodev_vhost_user_info);
 376 }
 377
 378 type_init(cryptodev_vhost_user_register_types);