| 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 | * Jay Zhou <jianjay.zhou@huawei.com> |
| 9 | * |
| 10 | * This library is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU Lesser General Public |
| 12 | * License as published by the Free Software Foundation; either |
| 13 | * version 2.1 of the License, or (at your option) any later version. |
| 14 | * |
| 15 | * This library is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 | * Lesser General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU Lesser General Public |
| 21 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | #include "qemu/osdep.h" |
| 26 | #include "hw/virtio/virtio-bus.h" |
| 27 | #include "system/cryptodev-vhost.h" |
| 28 | |
| 29 | #ifdef CONFIG_VHOST_CRYPTO |
| 30 | #include "qapi/error.h" |
| 31 | #include "qemu/error-report.h" |
| 32 | #include "hw/virtio/virtio-crypto.h" |
| 33 | #include "system/cryptodev-vhost-user.h" |
| 34 | |
| 35 | uint64_t |
| 36 | cryptodev_vhost_get_max_queues( |
| 37 | CryptoDevBackendVhost *crypto) |
| 38 | { |
| 39 | return crypto->dev.max_queues; |
| 40 | } |
| 41 | |
| 42 | void cryptodev_vhost_cleanup(CryptoDevBackendVhost *crypto) |
| 43 | { |
| 44 | vhost_dev_cleanup(&crypto->dev); |
| 45 | g_free(crypto); |
| 46 | } |
| 47 | |
| 48 | struct CryptoDevBackendVhost * |
| 49 | cryptodev_vhost_init( |
| 50 | CryptoDevBackendVhostOptions *options) |
| 51 | { |
| 52 | int r; |
| 53 | CryptoDevBackendVhost *crypto; |
| 54 | Error *local_err = NULL; |
| 55 | |
| 56 | crypto = g_new0(CryptoDevBackendVhost, 1); |
| 57 | crypto->dev.max_queues = 1; |
| 58 | crypto->dev.nvqs = 1; |
| 59 | crypto->dev.vqs = crypto->vqs; |
| 60 | |
| 61 | crypto->cc = options->cc; |
| 62 | |
| 63 | crypto->backend = -1; |
| 64 | |
| 65 | /* vhost-user needs vq_index to initiate a specific queue pair */ |
| 66 | crypto->dev.vq_index = crypto->cc->queue_index * crypto->dev.nvqs; |
| 67 | |
| 68 | r = vhost_dev_init(&crypto->dev, options->opaque, options->backend_type, 0, |
| 69 | &local_err); |
| 70 | if (r < 0) { |
| 71 | error_report_err(local_err); |
| 72 | goto fail; |
| 73 | } |
| 74 | |
| 75 | return crypto; |
| 76 | fail: |
| 77 | g_free(crypto); |
| 78 | return NULL; |
| 79 | } |
| 80 | |
| 81 | static int |
| 82 | cryptodev_vhost_start_one(CryptoDevBackendVhost *crypto, |
| 83 | VirtIODevice *dev) |
| 84 | { |
| 85 | int r; |
| 86 | |
| 87 | crypto->dev.nvqs = 1; |
| 88 | crypto->dev.vqs = crypto->vqs; |
| 89 | |
| 90 | r = vhost_dev_enable_notifiers(&crypto->dev, dev); |
| 91 | if (r < 0) { |
| 92 | goto fail_notifiers; |
| 93 | } |
| 94 | |
| 95 | r = vhost_dev_start(&crypto->dev, dev, false); |
| 96 | if (r < 0) { |
| 97 | goto fail_start; |
| 98 | } |
| 99 | |
| 100 | return 0; |
| 101 | |
| 102 | fail_start: |
| 103 | vhost_dev_disable_notifiers(&crypto->dev, dev); |
| 104 | fail_notifiers: |
| 105 | return r; |
| 106 | } |
| 107 | |
| 108 | static void |
| 109 | cryptodev_vhost_stop_one(CryptoDevBackendVhost *crypto, |
| 110 | VirtIODevice *dev) |
| 111 | { |
| 112 | vhost_dev_stop(&crypto->dev, dev, false); |
| 113 | vhost_dev_disable_notifiers(&crypto->dev, dev); |
| 114 | } |
| 115 | |
| 116 | CryptoDevBackendVhost * |
| 117 | cryptodev_get_vhost(CryptoDevBackendClient *cc, |
| 118 | CryptoDevBackend *b, |
| 119 | uint16_t queue) |
| 120 | { |
| 121 | CryptoDevBackendVhost *vhost_crypto = NULL; |
| 122 | |
| 123 | if (!cc) { |
| 124 | return NULL; |
| 125 | } |
| 126 | |
| 127 | switch (cc->type) { |
| 128 | #if defined(CONFIG_VHOST_USER) && defined(CONFIG_LINUX) |
| 129 | case QCRYPTODEV_BACKEND_TYPE_VHOST_USER: |
| 130 | vhost_crypto = cryptodev_vhost_user_get_vhost(cc, b, queue); |
| 131 | break; |
| 132 | #endif |
| 133 | default: |
| 134 | break; |
| 135 | } |
| 136 | |
| 137 | return vhost_crypto; |
| 138 | } |
| 139 | |
| 140 | static void |
| 141 | cryptodev_vhost_set_vq_index(CryptoDevBackendVhost *crypto, |
| 142 | int vq_index) |
| 143 | { |
| 144 | crypto->dev.vq_index = vq_index; |
| 145 | } |
| 146 | |
| 147 | static int |
| 148 | vhost_set_vring_enable(CryptoDevBackendClient *cc, |
| 149 | CryptoDevBackend *b, |
| 150 | uint16_t queue, int enable) |
| 151 | { |
| 152 | CryptoDevBackendVhost *crypto = |
| 153 | cryptodev_get_vhost(cc, b, queue); |
| 154 | |
| 155 | cc->vring_enable = enable; |
| 156 | |
| 157 | if (!crypto) { |
| 158 | return 0; |
| 159 | } |
| 160 | |
| 161 | return vhost_dev_set_vring_enable(&crypto->dev, enable); |
| 162 | } |
| 163 | |
| 164 | int cryptodev_vhost_start(VirtIODevice *dev, int total_queues) |
| 165 | { |
| 166 | VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(dev); |
| 167 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev))); |
| 168 | VirtioBusState *vbus = VIRTIO_BUS(qbus); |
| 169 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); |
| 170 | int r, e; |
| 171 | int i; |
| 172 | CryptoDevBackend *b = vcrypto->cryptodev; |
| 173 | CryptoDevBackendVhost *vhost_crypto; |
| 174 | CryptoDevBackendClient *cc; |
| 175 | |
| 176 | if (!k->set_guest_notifiers) { |
| 177 | error_report("binding does not support guest notifiers"); |
| 178 | return -ENOSYS; |
| 179 | } |
| 180 | |
| 181 | for (i = 0; i < total_queues; i++) { |
| 182 | cc = b->conf.peers.ccs[i]; |
| 183 | |
| 184 | vhost_crypto = cryptodev_get_vhost(cc, b, i); |
| 185 | cryptodev_vhost_set_vq_index(vhost_crypto, i); |
| 186 | |
| 187 | /* Suppress the masking guest notifiers on vhost user |
| 188 | * because vhost user doesn't interrupt masking/unmasking |
| 189 | * properly. |
| 190 | */ |
| 191 | if (cc->type == QCRYPTODEV_BACKEND_TYPE_VHOST_USER) { |
| 192 | dev->use_guest_notifier_mask = false; |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | r = k->set_guest_notifiers(qbus->parent, total_queues, true); |
| 197 | if (r < 0) { |
| 198 | error_report("error binding guest notifier: %d", -r); |
| 199 | goto err; |
| 200 | } |
| 201 | |
| 202 | for (i = 0; i < total_queues; i++) { |
| 203 | cc = b->conf.peers.ccs[i]; |
| 204 | |
| 205 | vhost_crypto = cryptodev_get_vhost(cc, b, i); |
| 206 | r = cryptodev_vhost_start_one(vhost_crypto, dev); |
| 207 | |
| 208 | if (r < 0) { |
| 209 | goto err_start; |
| 210 | } |
| 211 | |
| 212 | if (cc->vring_enable) { |
| 213 | /* restore vring enable state */ |
| 214 | r = vhost_set_vring_enable(cc, b, i, cc->vring_enable); |
| 215 | |
| 216 | if (r < 0) { |
| 217 | goto err_start; |
| 218 | } |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | return 0; |
| 223 | |
| 224 | err_start: |
| 225 | while (--i >= 0) { |
| 226 | cc = b->conf.peers.ccs[i]; |
| 227 | vhost_crypto = cryptodev_get_vhost(cc, b, i); |
| 228 | cryptodev_vhost_stop_one(vhost_crypto, dev); |
| 229 | } |
| 230 | e = k->set_guest_notifiers(qbus->parent, total_queues, false); |
| 231 | if (e < 0) { |
| 232 | error_report("vhost guest notifier cleanup failed: %d", e); |
| 233 | } |
| 234 | err: |
| 235 | return r; |
| 236 | } |
| 237 | |
| 238 | void cryptodev_vhost_stop(VirtIODevice *dev, int total_queues) |
| 239 | { |
| 240 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev))); |
| 241 | VirtioBusState *vbus = VIRTIO_BUS(qbus); |
| 242 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); |
| 243 | VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(dev); |
| 244 | CryptoDevBackend *b = vcrypto->cryptodev; |
| 245 | CryptoDevBackendVhost *vhost_crypto; |
| 246 | CryptoDevBackendClient *cc; |
| 247 | size_t i; |
| 248 | int r; |
| 249 | |
| 250 | for (i = 0; i < total_queues; i++) { |
| 251 | cc = b->conf.peers.ccs[i]; |
| 252 | |
| 253 | vhost_crypto = cryptodev_get_vhost(cc, b, i); |
| 254 | cryptodev_vhost_stop_one(vhost_crypto, dev); |
| 255 | } |
| 256 | |
| 257 | r = k->set_guest_notifiers(qbus->parent, total_queues, false); |
| 258 | if (r < 0) { |
| 259 | error_report("vhost guest notifier cleanup failed: %d", r); |
| 260 | } |
| 261 | assert(r >= 0); |
| 262 | } |
| 263 | |
| 264 | void cryptodev_vhost_virtqueue_mask(VirtIODevice *dev, |
| 265 | int queue, |
| 266 | int idx, bool mask) |
| 267 | { |
| 268 | VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(dev); |
| 269 | CryptoDevBackend *b = vcrypto->cryptodev; |
| 270 | CryptoDevBackendVhost *vhost_crypto; |
| 271 | CryptoDevBackendClient *cc; |
| 272 | |
| 273 | assert(queue < MAX_CRYPTO_QUEUE_NUM); |
| 274 | |
| 275 | cc = b->conf.peers.ccs[queue]; |
| 276 | vhost_crypto = cryptodev_get_vhost(cc, b, queue); |
| 277 | |
| 278 | vhost_virtqueue_mask(&vhost_crypto->dev, dev, idx, mask); |
| 279 | } |
| 280 | |
| 281 | bool cryptodev_vhost_virtqueue_pending(VirtIODevice *dev, |
| 282 | int queue, int idx) |
| 283 | { |
| 284 | VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(dev); |
| 285 | CryptoDevBackend *b = vcrypto->cryptodev; |
| 286 | CryptoDevBackendVhost *vhost_crypto; |
| 287 | CryptoDevBackendClient *cc; |
| 288 | |
| 289 | assert(queue < MAX_CRYPTO_QUEUE_NUM); |
| 290 | |
| 291 | cc = b->conf.peers.ccs[queue]; |
| 292 | vhost_crypto = cryptodev_get_vhost(cc, b, queue); |
| 293 | |
| 294 | return vhost_virtqueue_pending(&vhost_crypto->dev, idx); |
| 295 | } |
| 296 | |
| 297 | #else |
| 298 | uint64_t |
| 299 | cryptodev_vhost_get_max_queues(CryptoDevBackendVhost *crypto) |
| 300 | { |
| 301 | return 0; |
| 302 | } |
| 303 | |
| 304 | void cryptodev_vhost_cleanup(CryptoDevBackendVhost *crypto) |
| 305 | { |
| 306 | } |
| 307 | |
| 308 | struct CryptoDevBackendVhost * |
| 309 | cryptodev_vhost_init(CryptoDevBackendVhostOptions *options) |
| 310 | { |
| 311 | return NULL; |
| 312 | } |
| 313 | |
| 314 | CryptoDevBackendVhost * |
| 315 | cryptodev_get_vhost(CryptoDevBackendClient *cc, |
| 316 | CryptoDevBackend *b, |
| 317 | uint16_t queue) |
| 318 | { |
| 319 | return NULL; |
| 320 | } |
| 321 | |
| 322 | int cryptodev_vhost_start(VirtIODevice *dev, int total_queues) |
| 323 | { |
| 324 | return -1; |
| 325 | } |
| 326 | |
| 327 | void cryptodev_vhost_stop(VirtIODevice *dev, int total_queues) |
| 328 | { |
| 329 | } |
| 330 | |
| 331 | void cryptodev_vhost_virtqueue_mask(VirtIODevice *dev, |
| 332 | int queue, |
| 333 | int idx, bool mask) |
| 334 | { |
| 335 | } |
| 336 | |
| 337 | bool cryptodev_vhost_virtqueue_pending(VirtIODevice *dev, |
| 338 | int queue, int idx) |
| 339 | { |
| 340 | return false; |
| 341 | } |
| 342 | #endif |