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
  34
  35 /**
  36  * @TYPE_CRYPTODEV_BACKEND_VHOST_USER:
  37  * name of backend that uses vhost user server
  38  */
  39 #define TYPE_CRYPTODEV_BACKEND_VHOST_USER "cryptodev-vhost-user"
  40
  41 #define CRYPTODEV_BACKEND_VHOST_USER(obj) \
  42     OBJECT_CHECK(CryptoDevBackendVhostUser, \
  43                  (obj), TYPE_CRYPTODEV_BACKEND_VHOST_USER)
  44
  45
  46 typedef struct CryptoDevBackendVhostUser {
  47     CryptoDevBackend parent_obj;
  48
  49     VhostUserState vhost_user;
  50     CharBackend chr;
  51     char *chr_name;
  52     bool opened;
  53     CryptoDevBackendVhost *vhost_crypto[MAX_CRYPTO_QUEUE_NUM];
  54 } CryptoDevBackendVhostUser;
  55
  56 static int
  57 cryptodev_vhost_user_running(
  58              CryptoDevBackendVhost *crypto)
  59 {
  60     return crypto ? 1 : 0;
  61 }
  62
  63 CryptoDevBackendVhost *
  64 cryptodev_vhost_user_get_vhost(
  65                          CryptoDevBackendClient *cc,
  66                          CryptoDevBackend *b,
  67                          uint16_t queue)
  68 {
  69     CryptoDevBackendVhostUser *s =
  70                       CRYPTODEV_BACKEND_VHOST_USER(b);
  71     assert(cc->type == CRYPTODEV_BACKEND_TYPE_VHOST_USER);
  72     assert(queue < MAX_CRYPTO_QUEUE_NUM);
  73
  74     return s->vhost_crypto[queue];
  75 }
  76
  77 static void cryptodev_vhost_user_stop(int queues,
  78                           CryptoDevBackendVhostUser *s)
  79 {
  80     size_t i;
  81
  82     for (i = 0; i < queues; i++) {
  83         if (!cryptodev_vhost_user_running(s->vhost_crypto[i])) {
  84             continue;
  85         }
  86
  87         cryptodev_vhost_cleanup(s->vhost_crypto[i]);
  88         s->vhost_crypto[i] = NULL;
  89     }
  90 }
  91
  92 static int
  93 cryptodev_vhost_user_start(int queues,
  94                          CryptoDevBackendVhostUser *s)
  95 {
  96     CryptoDevBackendVhostOptions options;
  97     CryptoDevBackend *b = CRYPTODEV_BACKEND(s);
  98     int max_queues;
  99     size_t i;
 100
 101     for (i = 0; i < queues; i++) {
 102         if (cryptodev_vhost_user_running(s->vhost_crypto[i])) {
 103             continue;
 104         }
 105
 106         options.opaque = &s->vhost_user;
 107         options.backend_type = VHOST_BACKEND_TYPE_USER;
 108         options.cc = b->conf.peers.ccs[i];
 109         s->vhost_crypto[i] = cryptodev_vhost_init(&options);
 110         if (!s->vhost_crypto[i]) {
 111             error_report("failed to init vhost_crypto for queue %zu", i);
 112             goto err;
 113         }
 114
 115         if (i == 0) {
 116             max_queues =
 117               cryptodev_vhost_get_max_queues(s->vhost_crypto[i]);
 118             if (queues > max_queues) {
 119                 error_report("you are asking more queues than supported: %d",
 120                              max_queues);
 121                 goto err;
 122             }
 123         }
 124     }
 125
 126     return 0;
 127
 128 err:
 129     cryptodev_vhost_user_stop(i + 1, s);
 130     return -1;
 131 }
 132
 133 static Chardev *
 134 cryptodev_vhost_claim_chardev(CryptoDevBackendVhostUser *s,
 135                                     Error **errp)
 136 {
 137     Chardev *chr;
 138
 139     if (s->chr_name == NULL) {
 140         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 141                    "chardev", "a valid character device");
 142         return NULL;
 143     }
 144
 145     chr = qemu_chr_find(s->chr_name);
 146     if (chr == NULL) {
 147         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
 148                   "Device '%s' not found", s->chr_name);
 149         return NULL;
 150     }
 151
 152     return chr;
 153 }
 154
 155 static void cryptodev_vhost_user_event(void *opaque, int event)
 156 {
 157     CryptoDevBackendVhostUser *s = opaque;
 158     CryptoDevBackend *b = CRYPTODEV_BACKEND(s);
 159     int queues = b->conf.peers.queues;
 160
 161     assert(queues < MAX_CRYPTO_QUEUE_NUM);
 162
 163     switch (event) {
 164     case CHR_EVENT_OPENED:
 165         if (cryptodev_vhost_user_start(queues, s) < 0) {
 166             exit(1);
 167         }
 168         b->ready = true;
 169         break;
 170     case CHR_EVENT_CLOSED:
 171         b->ready = false;
 172         cryptodev_vhost_user_stop(queues, s);
 173         break;
 174     }
 175 }
 176
 177 static void cryptodev_vhost_user_init(
 178              CryptoDevBackend *backend, Error **errp)
 179 {
 180     int queues = backend->conf.peers.queues;
 181     size_t i;
 182     Error *local_err = NULL;
 183     Chardev *chr;
 184     CryptoDevBackendClient *cc;
 185     CryptoDevBackendVhostUser *s =
 186                       CRYPTODEV_BACKEND_VHOST_USER(backend);
 187
 188     chr = cryptodev_vhost_claim_chardev(s, &local_err);
 189     if (local_err) {
 190         error_propagate(errp, local_err);
 191         return;
 192     }
 193
 194     s->opened = true;
 195
 196     for (i = 0; i < queues; i++) {
 197         cc = cryptodev_backend_new_client(
 198                   "cryptodev-vhost-user", NULL);
 199         cc->info_str = g_strdup_printf("cryptodev-vhost-user%zu to %s ",
 200                                        i, chr->label);
 201         cc->queue_index = i;
 202         cc->type = CRYPTODEV_BACKEND_TYPE_VHOST_USER;
 203
 204         backend->conf.peers.ccs[i] = cc;
 205
 206         if (i == 0) {
 207             if (!qemu_chr_fe_init(&s->chr, chr, &local_err)) {
 208                 error_propagate(errp, local_err);
 209                 return;
 210             }
 211         }
 212     }
 213
 214     if (!vhost_user_init(&s->vhost_user, &s->chr, errp)) {
 215         return;
 216     }
 217
 218     qemu_chr_fe_set_handlers(&s->chr, NULL, NULL,
 219                      cryptodev_vhost_user_event, NULL, s, NULL, true);
 220
 221     backend->conf.crypto_services =
 222                          1u << VIRTIO_CRYPTO_SERVICE_CIPHER |
 223                          1u << VIRTIO_CRYPTO_SERVICE_HASH |
 224                          1u << VIRTIO_CRYPTO_SERVICE_MAC;
 225     backend->conf.cipher_algo_l = 1u << VIRTIO_CRYPTO_CIPHER_AES_CBC;
 226     backend->conf.hash_algo = 1u << VIRTIO_CRYPTO_HASH_SHA1;
 227
 228     backend->conf.max_size = UINT64_MAX;
 229     backend->conf.max_cipher_key_len = VHOST_USER_MAX_CIPHER_KEY_LEN;
 230     backend->conf.max_auth_key_len = VHOST_USER_MAX_AUTH_KEY_LEN;
 231 }
 232
 233 static int64_t cryptodev_vhost_user_sym_create_session(
 234            CryptoDevBackend *backend,
 235            CryptoDevBackendSymSessionInfo *sess_info,
 236            uint32_t queue_index, Error **errp)
 237 {
 238     CryptoDevBackendClient *cc =
 239                    backend->conf.peers.ccs[queue_index];
 240     CryptoDevBackendVhost *vhost_crypto;
 241     uint64_t session_id = 0;
 242     int ret;
 243
 244     vhost_crypto = cryptodev_vhost_user_get_vhost(cc, backend, queue_index);
 245     if (vhost_crypto) {
 246         struct vhost_dev *dev = &(vhost_crypto->dev);
 247         ret = dev->vhost_ops->vhost_crypto_create_session(dev,
 248                                                           sess_info,
 249                                                           &session_id);
 250         if (ret < 0) {
 251             return -1;
 252         } else {
 253             return session_id;
 254         }
 255     }
 256     return -1;
 257 }
 258
 259 static int cryptodev_vhost_user_sym_close_session(
 260            CryptoDevBackend *backend,
 261            uint64_t session_id,
 262            uint32_t queue_index, Error **errp)
 263 {
 264     CryptoDevBackendClient *cc =
 265                   backend->conf.peers.ccs[queue_index];
 266     CryptoDevBackendVhost *vhost_crypto;
 267     int ret;
 268
 269     vhost_crypto = cryptodev_vhost_user_get_vhost(cc, backend, queue_index);
 270     if (vhost_crypto) {
 271         struct vhost_dev *dev = &(vhost_crypto->dev);
 272         ret = dev->vhost_ops->vhost_crypto_close_session(dev,
 273                                                          session_id);
 274         if (ret < 0) {
 275             return -1;
 276         } else {
 277             return 0;
 278         }
 279     }
 280     return -1;
 281 }
 282
 283 static void cryptodev_vhost_user_cleanup(
 284              CryptoDevBackend *backend,
 285              Error **errp)
 286 {
 287     CryptoDevBackendVhostUser *s =
 288                       CRYPTODEV_BACKEND_VHOST_USER(backend);
 289     size_t i;
 290     int queues = backend->conf.peers.queues;
 291     CryptoDevBackendClient *cc;
 292
 293     cryptodev_vhost_user_stop(queues, s);
 294
 295     for (i = 0; i < queues; i++) {
 296         cc = backend->conf.peers.ccs[i];
 297         if (cc) {
 298             cryptodev_backend_free_client(cc);
 299             backend->conf.peers.ccs[i] = NULL;
 300         }
 301     }
 302
 303     vhost_user_cleanup(&s->vhost_user);
 304 }
 305
 306 static void cryptodev_vhost_user_set_chardev(Object *obj,
 307                                     const char *value, Error **errp)
 308 {
 309     CryptoDevBackendVhostUser *s =
 310                       CRYPTODEV_BACKEND_VHOST_USER(obj);
 311
 312     if (s->opened) {
 313         error_setg(errp, QERR_PERMISSION_DENIED);
 314     } else {
 315         g_free(s->chr_name);
 316         s->chr_name = g_strdup(value);
 317     }
 318 }
 319
 320 static char *
 321 cryptodev_vhost_user_get_chardev(Object *obj, Error **errp)
 322 {
 323     CryptoDevBackendVhostUser *s =
 324                       CRYPTODEV_BACKEND_VHOST_USER(obj);
 325     Chardev *chr = qemu_chr_fe_get_driver(&s->chr);
 326
 327     if (chr && chr->label) {
 328         return g_strdup(chr->label);
 329     }
 330
 331     return NULL;
 332 }
 333
 334 static void cryptodev_vhost_user_instance_int(Object *obj)
 335 {
 336     object_property_add_str(obj, "chardev",
 337                             cryptodev_vhost_user_get_chardev,
 338                             cryptodev_vhost_user_set_chardev,
 339                             NULL);
 340 }
 341
 342 static void cryptodev_vhost_user_finalize(Object *obj)
 343 {
 344     CryptoDevBackendVhostUser *s =
 345                       CRYPTODEV_BACKEND_VHOST_USER(obj);
 346
 347     qemu_chr_fe_deinit(&s->chr, false);
 348
 349     g_free(s->chr_name);
 350 }
 351
 352 static void
 353 cryptodev_vhost_user_class_init(ObjectClass *oc, void *data)
 354 {
 355     CryptoDevBackendClass *bc = CRYPTODEV_BACKEND_CLASS(oc);
 356
 357     bc->init = cryptodev_vhost_user_init;
 358     bc->cleanup = cryptodev_vhost_user_cleanup;
 359     bc->create_session = cryptodev_vhost_user_sym_create_session;
 360     bc->close_session = cryptodev_vhost_user_sym_close_session;
 361     bc->do_sym_op = NULL;
 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_init = cryptodev_vhost_user_instance_int,
 369     .instance_finalize = cryptodev_vhost_user_finalize,
 370     .instance_size = sizeof(CryptoDevBackendVhostUser),
 371 };
 372
 373 static void
 374 cryptodev_vhost_user_register_types(void)
 375 {
 376     type_register_static(&cryptodev_vhost_user_info);
 377 }
 378
 379 type_init(cryptodev_vhost_user_register_types);