hw/virtio/virtio-crypto.c

   1 /*
   2  * Virtio crypto Support
   3  *
   4  * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
   5  *
   6  * Authors:
   7  *    Gonglei <arei.gonglei@huawei.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or
  10  * (at your option) any later version.  See the COPYING file in the
  11  * top-level directory.
  12  */
  13 #include "qemu/osdep.h"
  14 #include "qemu/iov.h"
  15 #include "hw/qdev.h"
  16 #include "qapi/error.h"
  17 #include "qemu/error-report.h"
  18
  19 #include "hw/virtio/virtio.h"
  20 #include "hw/virtio/virtio-crypto.h"
  21 #include "hw/virtio/virtio-access.h"
  22 #include "standard-headers/linux/virtio_ids.h"
  23
  24 #define VIRTIO_CRYPTO_VM_VERSION 1
  25
  26 /*
  27  * Transfer virtqueue index to crypto queue index.
  28  * The control virtqueue is after the data virtqueues
  29  * so the input value doesn't need to be adjusted
  30  */
  31 static inline int virtio_crypto_vq2q(int queue_index)
  32 {
  33     return queue_index;
  34 }
  35
  36 static int
  37 virtio_crypto_cipher_session_helper(VirtIODevice *vdev,
  38            CryptoDevBackendSymSessionInfo *info,
  39            struct virtio_crypto_cipher_session_para *cipher_para,
  40            struct iovec **iov, unsigned int *out_num)
  41 {
  42     VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
  43     unsigned int num = *out_num;
  44
  45     info->cipher_alg = ldl_le_p(&cipher_para->algo);
  46     info->key_len = ldl_le_p(&cipher_para->keylen);
  47     info->direction = ldl_le_p(&cipher_para->op);
  48     DPRINTF("cipher_alg=%" PRIu32 ", info->direction=%" PRIu32 "\n",
  49              info->cipher_alg, info->direction);
  50
  51     if (info->key_len > vcrypto->conf.max_cipher_key_len) {
  52         error_report("virtio-crypto length of cipher key is too big: %u",
  53                      info->key_len);
  54         return -VIRTIO_CRYPTO_ERR;
  55     }
  56     /* Get cipher key */
  57     if (info->key_len > 0) {
  58         size_t s;
  59         DPRINTF("keylen=%" PRIu32 "\n", info->key_len);
  60
  61         info->cipher_key = g_malloc(info->key_len);
  62         s = iov_to_buf(*iov, num, 0, info->cipher_key, info->key_len);
  63         if (unlikely(s != info->key_len)) {
  64             virtio_error(vdev, "virtio-crypto cipher key incorrect");
  65             return -EFAULT;
  66         }
  67         iov_discard_front(iov, &num, info->key_len);
  68         *out_num = num;
  69     }
  70
  71     return 0;
  72 }
  73
  74 static int64_t
  75 virtio_crypto_create_sym_session(VirtIOCrypto *vcrypto,
  76                struct virtio_crypto_sym_create_session_req *sess_req,
  77                uint32_t queue_id,
  78                uint32_t opcode,
  79                struct iovec *iov, unsigned int out_num)
  80 {
  81     VirtIODevice *vdev = VIRTIO_DEVICE(vcrypto);
  82     CryptoDevBackendSymSessionInfo info;
  83     int64_t session_id;
  84     int queue_index;
  85     uint32_t op_type;
  86     Error *local_err = NULL;
  87     int ret;
  88
  89     memset(&info, 0, sizeof(info));
  90     op_type = ldl_le_p(&sess_req->op_type);
  91     info.op_type = op_type;
  92     info.op_code = opcode;
  93
  94     if (op_type == VIRTIO_CRYPTO_SYM_OP_CIPHER) {
  95         ret = virtio_crypto_cipher_session_helper(vdev, &info,
  96                            &sess_req->u.cipher.para,
  97                            &iov, &out_num);
  98         if (ret < 0) {
  99             goto err;
 100         }
 101     } else if (op_type == VIRTIO_CRYPTO_SYM_OP_ALGORITHM_CHAINING) {
 102         size_t s;
 103         /* cipher part */
 104         ret = virtio_crypto_cipher_session_helper(vdev, &info,
 105                            &sess_req->u.chain.para.cipher_param,
 106                            &iov, &out_num);
 107         if (ret < 0) {
 108             goto err;
 109         }
 110         /* hash part */
 111         info.alg_chain_order = ldl_le_p(
 112                                      &sess_req->u.chain.para.alg_chain_order);
 113         info.add_len = ldl_le_p(&sess_req->u.chain.para.aad_len);
 114         info.hash_mode = ldl_le_p(&sess_req->u.chain.para.hash_mode);
 115         if (info.hash_mode == VIRTIO_CRYPTO_SYM_HASH_MODE_AUTH) {
 116             info.hash_alg = ldl_le_p(&sess_req->u.chain.para.u.mac_param.algo);
 117             info.auth_key_len = ldl_le_p(
 118                              &sess_req->u.chain.para.u.mac_param.auth_key_len);
 119             info.hash_result_len = ldl_le_p(
 120                            &sess_req->u.chain.para.u.mac_param.hash_result_len);
 121             if (info.auth_key_len > vcrypto->conf.max_auth_key_len) {
 122                 error_report("virtio-crypto length of auth key is too big: %u",
 123                              info.auth_key_len);
 124                 ret = -VIRTIO_CRYPTO_ERR;
 125                 goto err;
 126             }
 127             /* get auth key */
 128             if (info.auth_key_len > 0) {
 129                 DPRINTF("auth_keylen=%" PRIu32 "\n", info.auth_key_len);
 130                 info.auth_key = g_malloc(info.auth_key_len);
 131                 s = iov_to_buf(iov, out_num, 0, info.auth_key,
 132                                info.auth_key_len);
 133                 if (unlikely(s != info.auth_key_len)) {
 134                     virtio_error(vdev,
 135                           "virtio-crypto authenticated key incorrect");
 136                     ret = -EFAULT;
 137                     goto err;
 138                 }
 139                 iov_discard_front(&iov, &out_num, info.auth_key_len);
 140             }
 141         } else if (info.hash_mode == VIRTIO_CRYPTO_SYM_HASH_MODE_PLAIN) {
 142             info.hash_alg = ldl_le_p(
 143                              &sess_req->u.chain.para.u.hash_param.algo);
 144             info.hash_result_len = ldl_le_p(
 145                         &sess_req->u.chain.para.u.hash_param.hash_result_len);
 146         } else {
 147             /* VIRTIO_CRYPTO_SYM_HASH_MODE_NESTED */
 148             error_report("unsupported hash mode");
 149             ret = -VIRTIO_CRYPTO_NOTSUPP;
 150             goto err;
 151         }
 152     } else {
 153         /* VIRTIO_CRYPTO_SYM_OP_NONE */
 154         error_report("unsupported cipher op_type: VIRTIO_CRYPTO_SYM_OP_NONE");
 155         ret = -VIRTIO_CRYPTO_NOTSUPP;
 156         goto err;
 157     }
 158
 159     queue_index = virtio_crypto_vq2q(queue_id);
 160     session_id = cryptodev_backend_sym_create_session(
 161                                      vcrypto->cryptodev,
 162                                      &info, queue_index, &local_err);
 163     if (session_id >= 0) {
 164         DPRINTF("create session_id=%" PRIu64 " successfully\n",
 165                 session_id);
 166
 167         ret = session_id;
 168     } else {
 169         if (local_err) {
 170             error_report_err(local_err);
 171         }
 172         ret = -VIRTIO_CRYPTO_ERR;
 173     }
 174
 175 err:
 176     g_free(info.cipher_key);
 177     g_free(info.auth_key);
 178     return ret;
 179 }
 180
 181 static uint8_t
 182 virtio_crypto_handle_close_session(VirtIOCrypto *vcrypto,
 183          struct virtio_crypto_destroy_session_req *close_sess_req,
 184          uint32_t queue_id)
 185 {
 186     int ret;
 187     uint64_t session_id;
 188     uint32_t status;
 189     Error *local_err = NULL;
 190
 191     session_id = ldq_le_p(&close_sess_req->session_id);
 192     DPRINTF("close session, id=%" PRIu64 "\n", session_id);
 193
 194     ret = cryptodev_backend_sym_close_session(
 195               vcrypto->cryptodev, session_id, queue_id, &local_err);
 196     if (ret == 0) {
 197         status = VIRTIO_CRYPTO_OK;
 198     } else {
 199         if (local_err) {
 200             error_report_err(local_err);
 201         } else {
 202             error_report("destroy session failed");
 203         }
 204         status = VIRTIO_CRYPTO_ERR;
 205     }
 206
 207     return status;
 208 }
 209
 210 static void virtio_crypto_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
 211 {
 212     VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
 213     struct virtio_crypto_op_ctrl_req ctrl;
 214     VirtQueueElement *elem;
 215     struct iovec *in_iov;
 216     struct iovec *out_iov;
 217     unsigned in_num;
 218     unsigned out_num;
 219     uint32_t queue_id;
 220     uint32_t opcode;
 221     struct virtio_crypto_session_input input;
 222     int64_t session_id;
 223     uint8_t status;
 224     size_t s;
 225
 226     for (;;) {
 227         elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
 228         if (!elem) {
 229             break;
 230         }
 231         if (elem->out_num < 1 || elem->in_num < 1) {
 232             virtio_error(vdev, "virtio-crypto ctrl missing headers");
 233             virtqueue_detach_element(vq, elem, 0);
 234             g_free(elem);
 235             break;
 236         }
 237
 238         out_num = elem->out_num;
 239         out_iov = elem->out_sg;
 240         in_num = elem->in_num;
 241         in_iov = elem->in_sg;
 242         if (unlikely(iov_to_buf(out_iov, out_num, 0, &ctrl, sizeof(ctrl))
 243                     != sizeof(ctrl))) {
 244             virtio_error(vdev, "virtio-crypto request ctrl_hdr too short");
 245             virtqueue_detach_element(vq, elem, 0);
 246             g_free(elem);
 247             break;
 248         }
 249         iov_discard_front(&out_iov, &out_num, sizeof(ctrl));
 250
 251         opcode = ldl_le_p(&ctrl.header.opcode);
 252         queue_id = ldl_le_p(&ctrl.header.queue_id);
 253
 254         switch (opcode) {
 255         case VIRTIO_CRYPTO_CIPHER_CREATE_SESSION:
 256             memset(&input, 0, sizeof(input));
 257             session_id = virtio_crypto_create_sym_session(vcrypto,
 258                              &ctrl.u.sym_create_session,
 259                              queue_id, opcode,
 260                              out_iov, out_num);
 261             /* Serious errors, need to reset virtio crypto device */
 262             if (session_id == -EFAULT) {
 263                 virtqueue_detach_element(vq, elem, 0);
 264                 break;
 265             } else if (session_id == -VIRTIO_CRYPTO_NOTSUPP) {
 266                 stl_le_p(&input.status, VIRTIO_CRYPTO_NOTSUPP);
 267             } else if (session_id == -VIRTIO_CRYPTO_ERR) {
 268                 stl_le_p(&input.status, VIRTIO_CRYPTO_ERR);
 269             } else {
 270                 /* Set the session id */
 271                 stq_le_p(&input.session_id, session_id);
 272                 stl_le_p(&input.status, VIRTIO_CRYPTO_OK);
 273             }
 274
 275             s = iov_from_buf(in_iov, in_num, 0, &input, sizeof(input));
 276             if (unlikely(s != sizeof(input))) {
 277                 virtio_error(vdev, "virtio-crypto input incorrect");
 278                 virtqueue_detach_element(vq, elem, 0);
 279                 break;
 280             }
 281             virtqueue_push(vq, elem, sizeof(input));
 282             virtio_notify(vdev, vq);
 283             break;
 284         case VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION:
 285         case VIRTIO_CRYPTO_HASH_DESTROY_SESSION:
 286         case VIRTIO_CRYPTO_MAC_DESTROY_SESSION:
 287         case VIRTIO_CRYPTO_AEAD_DESTROY_SESSION:
 288             status = virtio_crypto_handle_close_session(vcrypto,
 289                    &ctrl.u.destroy_session, queue_id);
 290             /* The status only occupy one byte, we can directly use it */
 291             s = iov_from_buf(in_iov, in_num, 0, &status, sizeof(status));
 292             if (unlikely(s != sizeof(status))) {
 293                 virtio_error(vdev, "virtio-crypto status incorrect");
 294                 virtqueue_detach_element(vq, elem, 0);
 295                 break;
 296             }
 297             virtqueue_push(vq, elem, sizeof(status));
 298             virtio_notify(vdev, vq);
 299             break;
 300         case VIRTIO_CRYPTO_HASH_CREATE_SESSION:
 301         case VIRTIO_CRYPTO_MAC_CREATE_SESSION:
 302         case VIRTIO_CRYPTO_AEAD_CREATE_SESSION:
 303         default:
 304             error_report("virtio-crypto unsupported ctrl opcode: %d", opcode);
 305             memset(&input, 0, sizeof(input));
 306             stl_le_p(&input.status, VIRTIO_CRYPTO_NOTSUPP);
 307             s = iov_from_buf(in_iov, in_num, 0, &input, sizeof(input));
 308             if (unlikely(s != sizeof(input))) {
 309                 virtio_error(vdev, "virtio-crypto input incorrect");
 310                 virtqueue_detach_element(vq, elem, 0);
 311                 break;
 312             }
 313             virtqueue_push(vq, elem, sizeof(input));
 314             virtio_notify(vdev, vq);
 315
 316             break;
 317         } /* end switch case */
 318
 319         g_free(elem);
 320     } /* end for loop */
 321 }
 322
 323 static void virtio_crypto_init_request(VirtIOCrypto *vcrypto, VirtQueue *vq,
 324                                 VirtIOCryptoReq *req)
 325 {
 326     req->vcrypto = vcrypto;
 327     req->vq = vq;
 328     req->in = NULL;
 329     req->in_iov = NULL;
 330     req->in_num = 0;
 331     req->in_len = 0;
 332     req->flags = CRYPTODEV_BACKEND_ALG__MAX;
 333     req->u.sym_op_info = NULL;
 334 }
 335
 336 static void virtio_crypto_free_request(VirtIOCryptoReq *req)
 337 {
 338     if (req) {
 339         if (req->flags == CRYPTODEV_BACKEND_ALG_SYM) {
 340             g_free(req->u.sym_op_info);
 341         }
 342         g_free(req);
 343     }
 344 }
 345
 346 static void
 347 virtio_crypto_sym_input_data_helper(VirtIODevice *vdev,
 348                 VirtIOCryptoReq *req,
 349                 uint32_t status,
 350                 CryptoDevBackendSymOpInfo *sym_op_info)
 351 {
 352     size_t s, len;
 353
 354     if (status != VIRTIO_CRYPTO_OK) {
 355         return;
 356     }
 357
 358     len = sym_op_info->dst_len;
 359     /* Save the cipher result */
 360     s = iov_from_buf(req->in_iov, req->in_num, 0, sym_op_info->dst, len);
 361     if (s != len) {
 362         virtio_error(vdev, "virtio-crypto dest data incorrect");
 363         return;
 364     }
 365
 366     iov_discard_front(&req->in_iov, &req->in_num, len);
 367
 368     if (sym_op_info->op_type ==
 369                       VIRTIO_CRYPTO_SYM_OP_ALGORITHM_CHAINING) {
 370         /* Save the digest result */
 371         s = iov_from_buf(req->in_iov, req->in_num, 0,
 372                          sym_op_info->digest_result,
 373                          sym_op_info->digest_result_len);
 374         if (s != sym_op_info->digest_result_len) {
 375             virtio_error(vdev, "virtio-crypto digest result incorrect");
 376         }
 377     }
 378 }
 379
 380 static void virtio_crypto_req_complete(VirtIOCryptoReq *req, uint8_t status)
 381 {
 382     VirtIOCrypto *vcrypto = req->vcrypto;
 383     VirtIODevice *vdev = VIRTIO_DEVICE(vcrypto);
 384
 385     if (req->flags == CRYPTODEV_BACKEND_ALG_SYM) {
 386         virtio_crypto_sym_input_data_helper(vdev, req, status,
 387                                             req->u.sym_op_info);
 388     }
 389     stb_p(&req->in->status, status);
 390     virtqueue_push(req->vq, &req->elem, req->in_len);
 391     virtio_notify(vdev, req->vq);
 392 }
 393
 394 static VirtIOCryptoReq *
 395 virtio_crypto_get_request(VirtIOCrypto *s, VirtQueue *vq)
 396 {
 397     VirtIOCryptoReq *req = virtqueue_pop(vq, sizeof(VirtIOCryptoReq));
 398
 399     if (req) {
 400         virtio_crypto_init_request(s, vq, req);
 401     }
 402     return req;
 403 }
 404
 405 static CryptoDevBackendSymOpInfo *
 406 virtio_crypto_sym_op_helper(VirtIODevice *vdev,
 407            struct virtio_crypto_cipher_para *cipher_para,
 408            struct virtio_crypto_alg_chain_data_para *alg_chain_para,
 409            struct iovec *iov, unsigned int out_num)
 410 {
 411     VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
 412     CryptoDevBackendSymOpInfo *op_info;
 413     uint32_t src_len = 0, dst_len = 0;
 414     uint32_t iv_len = 0;
 415     uint32_t aad_len = 0, hash_result_len = 0;
 416     uint32_t hash_start_src_offset = 0, len_to_hash = 0;
 417     uint32_t cipher_start_src_offset = 0, len_to_cipher = 0;
 418
 419     size_t max_len, curr_size = 0;
 420     size_t s;
 421
 422     /* Plain cipher */
 423     if (cipher_para) {
 424         iv_len = ldl_le_p(&cipher_para->iv_len);
 425         src_len = ldl_le_p(&cipher_para->src_data_len);
 426         dst_len = ldl_le_p(&cipher_para->dst_data_len);
 427     } else if (alg_chain_para) { /* Algorithm chain */
 428         iv_len = ldl_le_p(&alg_chain_para->iv_len);
 429         src_len = ldl_le_p(&alg_chain_para->src_data_len);
 430         dst_len = ldl_le_p(&alg_chain_para->dst_data_len);
 431
 432         aad_len = ldl_le_p(&alg_chain_para->aad_len);
 433         hash_result_len = ldl_le_p(&alg_chain_para->hash_result_len);
 434         hash_start_src_offset = ldl_le_p(
 435                          &alg_chain_para->hash_start_src_offset);
 436         cipher_start_src_offset = ldl_le_p(
 437                          &alg_chain_para->cipher_start_src_offset);
 438         len_to_cipher = ldl_le_p(&alg_chain_para->len_to_cipher);
 439         len_to_hash = ldl_le_p(&alg_chain_para->len_to_hash);
 440     } else {
 441         return NULL;
 442     }
 443
 444     max_len = iv_len + aad_len + src_len + dst_len + hash_result_len;
 445     if (unlikely(max_len > vcrypto->conf.max_size)) {
 446         virtio_error(vdev, "virtio-crypto too big length");
 447         return NULL;
 448     }
 449
 450     op_info = g_malloc0(sizeof(CryptoDevBackendSymOpInfo) + max_len);
 451     op_info->iv_len = iv_len;
 452     op_info->src_len = src_len;
 453     op_info->dst_len = dst_len;
 454     op_info->aad_len = aad_len;
 455     op_info->digest_result_len = hash_result_len;
 456     op_info->hash_start_src_offset = hash_start_src_offset;
 457     op_info->len_to_hash = len_to_hash;
 458     op_info->cipher_start_src_offset = cipher_start_src_offset;
 459     op_info->len_to_cipher = len_to_cipher;
 460     /* Handle the initilization vector */
 461     if (op_info->iv_len > 0) {
 462         DPRINTF("iv_len=%" PRIu32 "\n", op_info->iv_len);
 463         op_info->iv = op_info->data + curr_size;
 464
 465         s = iov_to_buf(iov, out_num, 0, op_info->iv, op_info->iv_len);
 466         if (unlikely(s != op_info->iv_len)) {
 467             virtio_error(vdev, "virtio-crypto iv incorrect");
 468             goto err;
 469         }
 470         iov_discard_front(&iov, &out_num, op_info->iv_len);
 471         curr_size += op_info->iv_len;
 472     }
 473
 474     /* Handle additional authentication data if exists */
 475     if (op_info->aad_len > 0) {
 476         DPRINTF("aad_len=%" PRIu32 "\n", op_info->aad_len);
 477         op_info->aad_data = op_info->data + curr_size;
 478
 479         s = iov_to_buf(iov, out_num, 0, op_info->aad_data, op_info->aad_len);
 480         if (unlikely(s != op_info->aad_len)) {
 481             virtio_error(vdev, "virtio-crypto additional auth data incorrect");
 482             goto err;
 483         }
 484         iov_discard_front(&iov, &out_num, op_info->aad_len);
 485
 486         curr_size += op_info->aad_len;
 487     }
 488
 489     /* Handle the source data */
 490     if (op_info->src_len > 0) {
 491         DPRINTF("src_len=%" PRIu32 "\n", op_info->src_len);
 492         op_info->src = op_info->data + curr_size;
 493
 494         s = iov_to_buf(iov, out_num, 0, op_info->src, op_info->src_len);
 495         if (unlikely(s != op_info->src_len)) {
 496             virtio_error(vdev, "virtio-crypto source data incorrect");
 497             goto err;
 498         }
 499         iov_discard_front(&iov, &out_num, op_info->src_len);
 500
 501         curr_size += op_info->src_len;
 502     }
 503
 504     /* Handle the destination data */
 505     op_info->dst = op_info->data + curr_size;
 506     curr_size += op_info->dst_len;
 507
 508     DPRINTF("dst_len=%" PRIu32 "\n", op_info->dst_len);
 509
 510     /* Handle the hash digest result */
 511     if (hash_result_len > 0) {
 512         DPRINTF("hash_result_len=%" PRIu32 "\n", hash_result_len);
 513         op_info->digest_result = op_info->data + curr_size;
 514     }
 515
 516     return op_info;
 517
 518 err:
 519     g_free(op_info);
 520     return NULL;
 521 }
 522
 523 static int
 524 virtio_crypto_handle_sym_req(VirtIOCrypto *vcrypto,
 525                struct virtio_crypto_sym_data_req *req,
 526                CryptoDevBackendSymOpInfo **sym_op_info,
 527                struct iovec *iov, unsigned int out_num)
 528 {
 529     VirtIODevice *vdev = VIRTIO_DEVICE(vcrypto);
 530     uint32_t op_type;
 531     CryptoDevBackendSymOpInfo *op_info;
 532
 533     op_type = ldl_le_p(&req->op_type);
 534
 535     if (op_type == VIRTIO_CRYPTO_SYM_OP_CIPHER) {
 536         op_info = virtio_crypto_sym_op_helper(vdev, &req->u.cipher.para,
 537                                               NULL, iov, out_num);
 538         if (!op_info) {
 539             return -EFAULT;
 540         }
 541         op_info->op_type = op_type;
 542     } else if (op_type == VIRTIO_CRYPTO_SYM_OP_ALGORITHM_CHAINING) {
 543         op_info = virtio_crypto_sym_op_helper(vdev, NULL,
 544                                               &req->u.chain.para,
 545                                               iov, out_num);
 546         if (!op_info) {
 547             return -EFAULT;
 548         }
 549         op_info->op_type = op_type;
 550     } else {
 551         /* VIRTIO_CRYPTO_SYM_OP_NONE */
 552         error_report("virtio-crypto unsupported cipher type");
 553         return -VIRTIO_CRYPTO_NOTSUPP;
 554     }
 555
 556     *sym_op_info = op_info;
 557
 558     return 0;
 559 }
 560
 561 static int
 562 virtio_crypto_handle_request(VirtIOCryptoReq *request)
 563 {
 564     VirtIOCrypto *vcrypto = request->vcrypto;
 565     VirtIODevice *vdev = VIRTIO_DEVICE(vcrypto);
 566     VirtQueueElement *elem = &request->elem;
 567     int queue_index = virtio_crypto_vq2q(virtio_get_queue_index(request->vq));
 568     struct virtio_crypto_op_data_req req;
 569     int ret;
 570     struct iovec *in_iov;
 571     struct iovec *out_iov;
 572     unsigned in_num;
 573     unsigned out_num;
 574     uint32_t opcode;
 575     uint8_t status = VIRTIO_CRYPTO_ERR;
 576     uint64_t session_id;
 577     CryptoDevBackendSymOpInfo *sym_op_info = NULL;
 578     Error *local_err = NULL;
 579
 580     if (elem->out_num < 1 || elem->in_num < 1) {
 581         virtio_error(vdev, "virtio-crypto dataq missing headers");
 582         return -1;
 583     }
 584
 585     out_num = elem->out_num;
 586     out_iov = elem->out_sg;
 587     in_num = elem->in_num;
 588     in_iov = elem->in_sg;
 589     if (unlikely(iov_to_buf(out_iov, out_num, 0, &req, sizeof(req))
 590                 != sizeof(req))) {
 591         virtio_error(vdev, "virtio-crypto request outhdr too short");
 592         return -1;
 593     }
 594     iov_discard_front(&out_iov, &out_num, sizeof(req));
 595
 596     if (in_iov[in_num - 1].iov_len <
 597             sizeof(struct virtio_crypto_inhdr)) {
 598         virtio_error(vdev, "virtio-crypto request inhdr too short");
 599         return -1;
 600     }
 601     /* We always touch the last byte, so just see how big in_iov is. */
 602     request->in_len = iov_size(in_iov, in_num);
 603     request->in = (void *)in_iov[in_num - 1].iov_base
 604               + in_iov[in_num - 1].iov_len
 605               - sizeof(struct virtio_crypto_inhdr);
 606     iov_discard_back(in_iov, &in_num, sizeof(struct virtio_crypto_inhdr));
 607
 608     /*
 609      * The length of operation result, including dest_data
 610      * and digest_result if exists.
 611      */
 612     request->in_num = in_num;
 613     request->in_iov = in_iov;
 614
 615     opcode = ldl_le_p(&req.header.opcode);
 616     session_id = ldq_le_p(&req.header.session_id);
 617
 618     switch (opcode) {
 619     case VIRTIO_CRYPTO_CIPHER_ENCRYPT:
 620     case VIRTIO_CRYPTO_CIPHER_DECRYPT:
 621         ret = virtio_crypto_handle_sym_req(vcrypto,
 622                          &req.u.sym_req,
 623                          &sym_op_info,
 624                          out_iov, out_num);
 625         /* Serious errors, need to reset virtio crypto device */
 626         if (ret == -EFAULT) {
 627             return -1;
 628         } else if (ret == -VIRTIO_CRYPTO_NOTSUPP) {
 629             virtio_crypto_req_complete(request, VIRTIO_CRYPTO_NOTSUPP);
 630             virtio_crypto_free_request(request);
 631         } else {
 632             sym_op_info->session_id = session_id;
 633
 634             /* Set request's parameter */
 635             request->flags = CRYPTODEV_BACKEND_ALG_SYM;
 636             request->u.sym_op_info = sym_op_info;
 637             ret = cryptodev_backend_crypto_operation(vcrypto->cryptodev,
 638                                     request, queue_index, &local_err);
 639             if (ret < 0) {
 640                 status = -ret;
 641                 if (local_err) {
 642                     error_report_err(local_err);
 643                 }
 644             } else { /* ret == VIRTIO_CRYPTO_OK */
 645                 status = ret;
 646             }
 647             virtio_crypto_req_complete(request, status);
 648             virtio_crypto_free_request(request);
 649         }
 650         break;
 651     case VIRTIO_CRYPTO_HASH:
 652     case VIRTIO_CRYPTO_MAC:
 653     case VIRTIO_CRYPTO_AEAD_ENCRYPT:
 654     case VIRTIO_CRYPTO_AEAD_DECRYPT:
 655     default:
 656         error_report("virtio-crypto unsupported dataq opcode: %u",
 657                      opcode);
 658         virtio_crypto_req_complete(request, VIRTIO_CRYPTO_NOTSUPP);
 659         virtio_crypto_free_request(request);
 660     }
 661
 662     return 0;
 663 }
 664
 665 static void virtio_crypto_handle_dataq(VirtIODevice *vdev, VirtQueue *vq)
 666 {
 667     VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
 668     VirtIOCryptoReq *req;
 669
 670     while ((req = virtio_crypto_get_request(vcrypto, vq))) {
 671         if (virtio_crypto_handle_request(req) < 0) {
 672             virtqueue_detach_element(req->vq, &req->elem, 0);
 673             virtio_crypto_free_request(req);
 674             break;
 675         }
 676     }
 677 }
 678
 679 static uint64_t virtio_crypto_get_features(VirtIODevice *vdev,
 680                                            uint64_t features,
 681                                            Error **errp)
 682 {
 683     return features;
 684 }
 685
 686 static void virtio_crypto_reset(VirtIODevice *vdev)
 687 {
 688     VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
 689     /* multiqueue is disabled by default */
 690     vcrypto->curr_queues = 1;
 691     if (!vcrypto->cryptodev->ready) {
 692         vcrypto->status &= ~VIRTIO_CRYPTO_S_HW_READY;
 693     } else {
 694         vcrypto->status |= VIRTIO_CRYPTO_S_HW_READY;
 695     }
 696 }
 697
 698 static void virtio_crypto_init_config(VirtIODevice *vdev)
 699 {
 700     VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
 701
 702     vcrypto->conf.crypto_services =
 703                      vcrypto->conf.cryptodev->conf.crypto_services;
 704     vcrypto->conf.cipher_algo_l =
 705                      vcrypto->conf.cryptodev->conf.cipher_algo_l;
 706     vcrypto->conf.cipher_algo_h =
 707                      vcrypto->conf.cryptodev->conf.cipher_algo_h;
 708     vcrypto->conf.hash_algo = vcrypto->conf.cryptodev->conf.hash_algo;
 709     vcrypto->conf.mac_algo_l = vcrypto->conf.cryptodev->conf.mac_algo_l;
 710     vcrypto->conf.mac_algo_h = vcrypto->conf.cryptodev->conf.mac_algo_h;
 711     vcrypto->conf.aead_algo = vcrypto->conf.cryptodev->conf.aead_algo;
 712     vcrypto->conf.max_cipher_key_len =
 713                   vcrypto->conf.cryptodev->conf.max_cipher_key_len;
 714     vcrypto->conf.max_auth_key_len =
 715                   vcrypto->conf.cryptodev->conf.max_auth_key_len;
 716     vcrypto->conf.max_size = vcrypto->conf.cryptodev->conf.max_size;
 717 }
 718
 719 static void virtio_crypto_device_realize(DeviceState *dev, Error **errp)
 720 {
 721     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
 722     VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(dev);
 723     int i;
 724
 725     vcrypto->cryptodev = vcrypto->conf.cryptodev;
 726     if (vcrypto->cryptodev == NULL) {
 727         error_setg(errp, "'cryptodev' parameter expects a valid object");
 728         return;
 729     }
 730
 731     vcrypto->max_queues = MAX(vcrypto->cryptodev->conf.peers.queues, 1);
 732     if (vcrypto->max_queues + 1 > VIRTIO_QUEUE_MAX) {
 733         error_setg(errp, "Invalid number of queues (= %" PRIu32 "), "
 734                    "must be a postive integer less than %d.",
 735                    vcrypto->max_queues, VIRTIO_QUEUE_MAX);
 736         return;
 737     }
 738
 739     virtio_init(vdev, "virtio-crypto", VIRTIO_ID_CRYPTO, vcrypto->config_size);
 740     vcrypto->curr_queues = 1;
 741
 742     for (i = 0; i < vcrypto->max_queues; i++) {
 743         virtio_add_queue(vdev, 1024, virtio_crypto_handle_dataq);
 744     }
 745
 746     vcrypto->ctrl_vq = virtio_add_queue(vdev, 64, virtio_crypto_handle_ctrl);
 747     if (!vcrypto->cryptodev->ready) {
 748         vcrypto->status &= ~VIRTIO_CRYPTO_S_HW_READY;
 749     } else {
 750         vcrypto->status |= VIRTIO_CRYPTO_S_HW_READY;
 751     }
 752
 753     virtio_crypto_init_config(vdev);
 754 }
 755
 756 static void virtio_crypto_device_unrealize(DeviceState *dev, Error **errp)
 757 {
 758     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
 759
 760     virtio_cleanup(vdev);
 761 }
 762
 763 static const VMStateDescription vmstate_virtio_crypto = {
 764     .name = "virtio-crypto",
 765     .minimum_version_id = VIRTIO_CRYPTO_VM_VERSION,
 766     .version_id = VIRTIO_CRYPTO_VM_VERSION,
 767     .fields = (VMStateField[]) {
 768         VMSTATE_VIRTIO_DEVICE,
 769         VMSTATE_END_OF_LIST()
 770     },
 771 };
 772
 773 static Property virtio_crypto_properties[] = {
 774     DEFINE_PROP_END_OF_LIST(),
 775 };
 776
 777 static void virtio_crypto_get_config(VirtIODevice *vdev, uint8_t *config)
 778 {
 779     VirtIOCrypto *c = VIRTIO_CRYPTO(vdev);
 780     struct virtio_crypto_config crypto_cfg;
 781
 782     /*
 783      * Virtio-crypto device conforms to VIRTIO 1.0 which is always LE,
 784      * so we can use LE accessors directly.
 785      */
 786     stl_le_p(&crypto_cfg.status, c->status);
 787     stl_le_p(&crypto_cfg.max_dataqueues, c->max_queues);
 788     stl_le_p(&crypto_cfg.crypto_services, c->conf.crypto_services);
 789     stl_le_p(&crypto_cfg.cipher_algo_l, c->conf.cipher_algo_l);
 790     stl_le_p(&crypto_cfg.cipher_algo_h, c->conf.cipher_algo_h);
 791     stl_le_p(&crypto_cfg.hash_algo, c->conf.hash_algo);
 792     stl_le_p(&crypto_cfg.mac_algo_l, c->conf.mac_algo_l);
 793     stl_le_p(&crypto_cfg.mac_algo_h, c->conf.mac_algo_h);
 794     stl_le_p(&crypto_cfg.aead_algo, c->conf.aead_algo);
 795     stl_le_p(&crypto_cfg.max_cipher_key_len, c->conf.max_cipher_key_len);
 796     stl_le_p(&crypto_cfg.max_auth_key_len, c->conf.max_auth_key_len);
 797     stq_le_p(&crypto_cfg.max_size, c->conf.max_size);
 798
 799     memcpy(config, &crypto_cfg, c->config_size);
 800 }
 801
 802 static void virtio_crypto_class_init(ObjectClass *klass, void *data)
 803 {
 804     DeviceClass *dc = DEVICE_CLASS(klass);
 805     VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
 806
 807     dc->props = virtio_crypto_properties;
 808     dc->vmsd = &vmstate_virtio_crypto;
 809     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 810     vdc->realize = virtio_crypto_device_realize;
 811     vdc->unrealize = virtio_crypto_device_unrealize;
 812     vdc->get_config = virtio_crypto_get_config;
 813     vdc->get_features = virtio_crypto_get_features;
 814     vdc->reset = virtio_crypto_reset;
 815 }
 816
 817 static void virtio_crypto_instance_init(Object *obj)
 818 {
 819     VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(obj);
 820
 821     /*
 822      * The default config_size is sizeof(struct virtio_crypto_config).
 823      * Can be overriden with virtio_crypto_set_config_size.
 824      */
 825     vcrypto->config_size = sizeof(struct virtio_crypto_config);
 826
 827     object_property_add_link(obj, "cryptodev",
 828                              TYPE_CRYPTODEV_BACKEND,
 829                              (Object **)&vcrypto->conf.cryptodev,
 830                              qdev_prop_allow_set_link_before_realize,
 831                              OBJ_PROP_LINK_UNREF_ON_RELEASE, NULL);
 832 }
 833
 834 static const TypeInfo virtio_crypto_info = {
 835     .name = TYPE_VIRTIO_CRYPTO,
 836     .parent = TYPE_VIRTIO_DEVICE,
 837     .instance_size = sizeof(VirtIOCrypto),
 838     .instance_init = virtio_crypto_instance_init,
 839     .class_init = virtio_crypto_class_init,
 840 };
 841
 842 static void virtio_register_types(void)
 843 {
 844     type_register_static(&virtio_crypto_info);
 845 }
 846
 847 type_init(virtio_register_types)