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, QEMUChrEvent 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     case CHR_EVENT_BREAK:
 175     case CHR_EVENT_MUX_IN:
 176     case CHR_EVENT_MUX_OUT:
 177         /* Ignore */
 178         break;
 179     }
 180 }
 181
 182 static void cryptodev_vhost_user_init(
 183              CryptoDevBackend *backend, Error **errp)
 184 {
 185     int queues = backend->conf.peers.queues;
 186     size_t i;
 187     Error *local_err = NULL;
 188     Chardev *chr;
 189     CryptoDevBackendClient *cc;
 190     CryptoDevBackendVhostUser *s =
 191                       CRYPTODEV_BACKEND_VHOST_USER(backend);
 192
 193     chr = cryptodev_vhost_claim_chardev(s, &local_err);
 194     if (local_err) {
 195         error_propagate(errp, local_err);
 196         return;
 197     }
 198
 199     s->opened = true;
 200
 201     for (i = 0; i < queues; i++) {
 202         cc = cryptodev_backend_new_client(
 203                   "cryptodev-vhost-user", NULL);
 204         cc->info_str = g_strdup_printf("cryptodev-vhost-user%zu to %s ",
 205                                        i, chr->label);
 206         cc->queue_index = i;
 207         cc->type = CRYPTODEV_BACKEND_TYPE_VHOST_USER;
 208
 209         backend->conf.peers.ccs[i] = cc;
 210
 211         if (i == 0) {
 212             if (!qemu_chr_fe_init(&s->chr, chr, &local_err)) {
 213                 error_propagate(errp, local_err);
 214                 return;
 215             }
 216         }
 217     }
 218
 219     if (!vhost_user_init(&s->vhost_user, &s->chr, errp)) {
 220         return;
 221     }
 222
 223     qemu_chr_fe_set_handlers(&s->chr, NULL, NULL,
 224                      cryptodev_vhost_user_event, NULL, s, NULL, true);
 225
 226     backend->conf.crypto_services =
 227                          1u << VIRTIO_CRYPTO_SERVICE_CIPHER |
 228                          1u << VIRTIO_CRYPTO_SERVICE_HASH |
 229                          1u << VIRTIO_CRYPTO_SERVICE_MAC;
 230     backend->conf.cipher_algo_l = 1u << VIRTIO_CRYPTO_CIPHER_AES_CBC;
 231     backend->conf.hash_algo = 1u << VIRTIO_CRYPTO_HASH_SHA1;
 232
 233     backend->conf.max_size = UINT64_MAX;
 234     backend->conf.max_cipher_key_len = VHOST_USER_MAX_CIPHER_KEY_LEN;
 235     backend->conf.max_auth_key_len = VHOST_USER_MAX_AUTH_KEY_LEN;
 236 }
 237
 238 static int64_t cryptodev_vhost_user_sym_create_session(
 239            CryptoDevBackend *backend,
 240            CryptoDevBackendSymSessionInfo *sess_info,
 241            uint32_t queue_index, Error **errp)
 242 {
 243     CryptoDevBackendClient *cc =
 244                    backend->conf.peers.ccs[queue_index];
 245     CryptoDevBackendVhost *vhost_crypto;
 246     uint64_t session_id = 0;
 247     int ret;
 248
 249     vhost_crypto = cryptodev_vhost_user_get_vhost(cc, backend, queue_index);
 250     if (vhost_crypto) {
 251         struct vhost_dev *dev = &(vhost_crypto->dev);
 252         ret = dev->vhost_ops->vhost_crypto_create_session(dev,
 253                                                           sess_info,
 254                                                           &session_id);
 255         if (ret < 0) {
 256             return -1;
 257         } else {
 258             return session_id;
 259         }
 260     }
 261     return -1;
 262 }
 263
 264 static int cryptodev_vhost_user_sym_close_session(
 265            CryptoDevBackend *backend,
 266            uint64_t session_id,
 267            uint32_t queue_index, Error **errp)
 268 {
 269     CryptoDevBackendClient *cc =
 270                   backend->conf.peers.ccs[queue_index];
 271     CryptoDevBackendVhost *vhost_crypto;
 272     int ret;
 273
 274     vhost_crypto = cryptodev_vhost_user_get_vhost(cc, backend, queue_index);
 275     if (vhost_crypto) {
 276         struct vhost_dev *dev = &(vhost_crypto->dev);
 277         ret = dev->vhost_ops->vhost_crypto_close_session(dev,
 278                                                          session_id);
 279         if (ret < 0) {
 280             return -1;
 281         } else {
 282             return 0;
 283         }
 284     }
 285     return -1;
 286 }
 287
 288 static void cryptodev_vhost_user_cleanup(
 289              CryptoDevBackend *backend,
 290              Error **errp)
 291 {
 292     CryptoDevBackendVhostUser *s =
 293                       CRYPTODEV_BACKEND_VHOST_USER(backend);
 294     size_t i;
 295     int queues = backend->conf.peers.queues;
 296     CryptoDevBackendClient *cc;
 297
 298     cryptodev_vhost_user_stop(queues, s);
 299
 300     for (i = 0; i < queues; i++) {
 301         cc = backend->conf.peers.ccs[i];
 302         if (cc) {
 303             cryptodev_backend_free_client(cc);
 304             backend->conf.peers.ccs[i] = NULL;
 305         }
 306     }
 307
 308     vhost_user_cleanup(&s->vhost_user);
 309 }
 310
 311 static void cryptodev_vhost_user_set_chardev(Object *obj,
 312                                     const char *value, Error **errp)
 313 {
 314     CryptoDevBackendVhostUser *s =
 315                       CRYPTODEV_BACKEND_VHOST_USER(obj);
 316
 317     if (s->opened) {
 318         error_setg(errp, QERR_PERMISSION_DENIED);
 319     } else {
 320         g_free(s->chr_name);
 321         s->chr_name = g_strdup(value);
 322     }
 323 }
 324
 325 static char *
 326 cryptodev_vhost_user_get_chardev(Object *obj, Error **errp)
 327 {
 328     CryptoDevBackendVhostUser *s =
 329                       CRYPTODEV_BACKEND_VHOST_USER(obj);
 330     Chardev *chr = qemu_chr_fe_get_driver(&s->chr);
 331
 332     if (chr && chr->label) {
 333         return g_strdup(chr->label);
 334     }
 335
 336     return NULL;
 337 }
 338
 339 static void cryptodev_vhost_user_instance_int(Object *obj)
 340 {
 341     object_property_add_str(obj, "chardev",
 342                             cryptodev_vhost_user_get_chardev,
 343                             cryptodev_vhost_user_set_chardev);
 344 }
 345
 346 static void cryptodev_vhost_user_finalize(Object *obj)
 347 {
 348     CryptoDevBackendVhostUser *s =
 349                       CRYPTODEV_BACKEND_VHOST_USER(obj);
 350
 351     qemu_chr_fe_deinit(&s->chr, false);
 352
 353     g_free(s->chr_name);
 354 }
 355
 356 static void
 357 cryptodev_vhost_user_class_init(ObjectClass *oc, void *data)
 358 {
 359     CryptoDevBackendClass *bc = CRYPTODEV_BACKEND_CLASS(oc);
 360
 361     bc->init = cryptodev_vhost_user_init;
 362     bc->cleanup = cryptodev_vhost_user_cleanup;
 363     bc->create_session = cryptodev_vhost_user_sym_create_session;
 364     bc->close_session = cryptodev_vhost_user_sym_close_session;
 365     bc->do_sym_op = NULL;
 366 }
 367
 368 static const TypeInfo cryptodev_vhost_user_info = {
 369     .name = TYPE_CRYPTODEV_BACKEND_VHOST_USER,
 370     .parent = TYPE_CRYPTODEV_BACKEND,
 371     .class_init = cryptodev_vhost_user_class_init,
 372     .instance_init = cryptodev_vhost_user_instance_int,
 373     .instance_finalize = cryptodev_vhost_user_finalize,
 374     .instance_size = sizeof(CryptoDevBackendVhostUser),
 375 };
 376
 377 static void
 378 cryptodev_vhost_user_register_types(void)
 379 {
 380     type_register_static(&cryptodev_vhost_user_info);
 381 }
 382
 383 type_init(cryptodev_vhost_user_register_types);