1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Virtio PCI driver - common functionality for all device versions 4 * 5 * This module allows virtio devices to be used over a virtual PCI device. 6 * This can be used with QEMU based VMMs like KVM or Xen. 7 * 8 * Copyright IBM Corp. 2007 9 * Copyright Red Hat, Inc. 2014 10 * 11 * Authors: 12 * Anthony Liguori <aliguori@us.ibm.com> 13 * Rusty Russell <rusty@rustcorp.com.au> 14 * Michael S. Tsirkin <mst@redhat.com> 15 */ 16 17 #include "virtio_pci_common.h" 18 19 static bool force_legacy = false; 20 21 #if IS_ENABLED(CONFIG_VIRTIO_PCI_LEGACY) 22 module_param(force_legacy, bool, 0444); 23 MODULE_PARM_DESC(force_legacy, 24 "Force legacy mode for transitional virtio 1 devices"); 25 #endif 26 27 /* disable irq handlers */ 28 void vp_disable_cbs(struct virtio_device *vdev) 29 { 30 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 31 int i; 32 33 if (vp_dev->intx_enabled) { 34 /* 35 * The below synchronize() guarantees that any 36 * interrupt for this line arriving after 37 * synchronize_irq() has completed is guaranteed to see 38 * intx_soft_enabled == false. 39 */ 40 WRITE_ONCE(vp_dev->intx_soft_enabled, false); 41 synchronize_irq(vp_dev->pci_dev->irq); 42 } 43 44 for (i = 0; i < vp_dev->msix_vectors; ++i) 45 disable_irq(pci_irq_vector(vp_dev->pci_dev, i)); 46 } 47 48 /* enable irq handlers */ 49 void vp_enable_cbs(struct virtio_device *vdev) 50 { 51 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 52 int i; 53 54 if (vp_dev->intx_enabled) { 55 disable_irq(vp_dev->pci_dev->irq); 56 /* 57 * The above disable_irq() provides TSO ordering and 58 * as such promotes the below store to store-release. 59 */ 60 WRITE_ONCE(vp_dev->intx_soft_enabled, true); 61 enable_irq(vp_dev->pci_dev->irq); 62 return; 63 } 64 65 for (i = 0; i < vp_dev->msix_vectors; ++i) 66 enable_irq(pci_irq_vector(vp_dev->pci_dev, i)); 67 } 68 69 /* the notify function used when creating a virt queue */ 70 bool vp_notify(struct virtqueue *vq) 71 { 72 /* we write the queue's selector into the notification register to 73 * signal the other end */ 74 iowrite16(vq->index, (void __iomem *)vq->priv); 75 return true; 76 } 77 78 /* Handle a configuration change: Tell driver if it wants to know. */ 79 static irqreturn_t vp_config_changed(int irq, void *opaque) 80 { 81 struct virtio_pci_device *vp_dev = opaque; 82 83 virtio_config_changed(&vp_dev->vdev); 84 return IRQ_HANDLED; 85 } 86 87 /* Notify all virtqueues on an interrupt. */ 88 static irqreturn_t vp_vring_interrupt(int irq, void *opaque) 89 { 90 struct virtio_pci_device *vp_dev = opaque; 91 struct virtio_pci_vq_info *info; 92 irqreturn_t ret = IRQ_NONE; 93 unsigned long flags; 94 95 spin_lock_irqsave(&vp_dev->lock, flags); 96 list_for_each_entry(info, &vp_dev->virtqueues, node) { 97 if (vring_interrupt(irq, info->vq) == IRQ_HANDLED) 98 ret = IRQ_HANDLED; 99 } 100 spin_unlock_irqrestore(&vp_dev->lock, flags); 101 102 return ret; 103 } 104 105 /* A small wrapper to also acknowledge the interrupt when it's handled. 106 * I really need an EIO hook for the vring so I can ack the interrupt once we 107 * know that we'll be handling the IRQ but before we invoke the callback since 108 * the callback may notify the host which results in the host attempting to 109 * raise an interrupt that we would then mask once we acknowledged the 110 * interrupt. */ 111 static irqreturn_t vp_interrupt(int irq, void *opaque) 112 { 113 struct virtio_pci_device *vp_dev = opaque; 114 u8 isr; 115 116 if (!READ_ONCE(vp_dev->intx_soft_enabled)) 117 return IRQ_NONE; 118 119 /* reading the ISR has the effect of also clearing it so it's very 120 * important to save off the value. */ 121 isr = ioread8(vp_dev->isr); 122 123 /* It's definitely not us if the ISR was not high */ 124 if (!isr) 125 return IRQ_NONE; 126 127 /* Configuration change? Tell driver if it wants to know. */ 128 if (isr & VIRTIO_PCI_ISR_CONFIG) 129 vp_config_changed(irq, opaque); 130 131 return vp_vring_interrupt(irq, opaque); 132 } 133 134 static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors, 135 bool per_vq_vectors, struct irq_affinity *desc) 136 { 137 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 138 const char *name = dev_name(&vp_dev->vdev.dev); 139 unsigned flags = PCI_IRQ_MSIX; 140 unsigned i, v; 141 int err = -ENOMEM; 142 143 vp_dev->msix_vectors = nvectors; 144 145 vp_dev->msix_names = kmalloc_array(nvectors, 146 sizeof(*vp_dev->msix_names), 147 GFP_KERNEL); 148 if (!vp_dev->msix_names) 149 goto error; 150 vp_dev->msix_affinity_masks 151 = kcalloc(nvectors, sizeof(*vp_dev->msix_affinity_masks), 152 GFP_KERNEL); 153 if (!vp_dev->msix_affinity_masks) 154 goto error; 155 for (i = 0; i < nvectors; ++i) 156 if (!alloc_cpumask_var(&vp_dev->msix_affinity_masks[i], 157 GFP_KERNEL)) 158 goto error; 159 160 if (desc) { 161 flags |= PCI_IRQ_AFFINITY; 162 desc->pre_vectors++; /* virtio config vector */ 163 } 164 165 err = pci_alloc_irq_vectors_affinity(vp_dev->pci_dev, nvectors, 166 nvectors, flags, desc); 167 if (err < 0) 168 goto error; 169 vp_dev->msix_enabled = 1; 170 171 /* Set the vector used for configuration */ 172 v = vp_dev->msix_used_vectors; 173 snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names, 174 "%s-config", name); 175 err = request_irq(pci_irq_vector(vp_dev->pci_dev, v), 176 vp_config_changed, IRQF_NO_AUTOEN, 177 vp_dev->msix_names[v], 178 vp_dev); 179 if (err) 180 goto error; 181 ++vp_dev->msix_used_vectors; 182 183 v = vp_dev->config_vector(vp_dev, v); 184 /* Verify we had enough resources to assign the vector */ 185 if (v == VIRTIO_MSI_NO_VECTOR) { 186 err = -EBUSY; 187 goto error; 188 } 189 190 if (!per_vq_vectors) { 191 /* Shared vector for all VQs */ 192 v = vp_dev->msix_used_vectors; 193 snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names, 194 "%s-virtqueues", name); 195 err = request_irq(pci_irq_vector(vp_dev->pci_dev, v), 196 vp_vring_interrupt, IRQF_NO_AUTOEN, 197 vp_dev->msix_names[v], 198 vp_dev); 199 if (err) 200 goto error; 201 ++vp_dev->msix_used_vectors; 202 } 203 return 0; 204 error: 205 return err; 206 } 207 208 static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned index, 209 void (*callback)(struct virtqueue *vq), 210 const char *name, 211 bool ctx, 212 u16 msix_vec) 213 { 214 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 215 struct virtio_pci_vq_info *info = kmalloc(sizeof *info, GFP_KERNEL); 216 struct virtqueue *vq; 217 unsigned long flags; 218 219 /* fill out our structure that represents an active queue */ 220 if (!info) 221 return ERR_PTR(-ENOMEM); 222 223 vq = vp_dev->setup_vq(vp_dev, info, index, callback, name, ctx, 224 msix_vec); 225 if (IS_ERR(vq)) 226 goto out_info; 227 228 info->vq = vq; 229 if (callback) { 230 spin_lock_irqsave(&vp_dev->lock, flags); 231 list_add(&info->node, &vp_dev->virtqueues); 232 spin_unlock_irqrestore(&vp_dev->lock, flags); 233 } else { 234 INIT_LIST_HEAD(&info->node); 235 } 236 237 vp_dev->vqs[index] = info; 238 return vq; 239 240 out_info: 241 kfree(info); 242 return vq; 243 } 244 245 static void vp_del_vq(struct virtqueue *vq) 246 { 247 struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev); 248 struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index]; 249 unsigned long flags; 250 251 spin_lock_irqsave(&vp_dev->lock, flags); 252 list_del(&info->node); 253 spin_unlock_irqrestore(&vp_dev->lock, flags); 254 255 vp_dev->del_vq(info); 256 kfree(info); 257 } 258 259 /* the config->del_vqs() implementation */ 260 void vp_del_vqs(struct virtio_device *vdev) 261 { 262 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 263 struct virtqueue *vq, *n; 264 int i; 265 266 list_for_each_entry_safe(vq, n, &vdev->vqs, list) { 267 if (vp_dev->per_vq_vectors) { 268 int v = vp_dev->vqs[vq->index]->msix_vector; 269 270 if (v != VIRTIO_MSI_NO_VECTOR) { 271 int irq = pci_irq_vector(vp_dev->pci_dev, v); 272 273 irq_set_affinity_hint(irq, NULL); 274 free_irq(irq, vq); 275 } 276 } 277 vp_del_vq(vq); 278 } 279 vp_dev->per_vq_vectors = false; 280 281 if (vp_dev->intx_enabled) { 282 free_irq(vp_dev->pci_dev->irq, vp_dev); 283 vp_dev->intx_enabled = 0; 284 } 285 286 for (i = 0; i < vp_dev->msix_used_vectors; ++i) 287 free_irq(pci_irq_vector(vp_dev->pci_dev, i), vp_dev); 288 289 if (vp_dev->msix_affinity_masks) { 290 for (i = 0; i < vp_dev->msix_vectors; i++) 291 if (vp_dev->msix_affinity_masks[i]) 292 free_cpumask_var(vp_dev->msix_affinity_masks[i]); 293 } 294 295 if (vp_dev->msix_enabled) { 296 /* Disable the vector used for configuration */ 297 vp_dev->config_vector(vp_dev, VIRTIO_MSI_NO_VECTOR); 298 299 pci_free_irq_vectors(vp_dev->pci_dev); 300 vp_dev->msix_enabled = 0; 301 } 302 303 vp_dev->msix_vectors = 0; 304 vp_dev->msix_used_vectors = 0; 305 kfree(vp_dev->msix_names); 306 vp_dev->msix_names = NULL; 307 kfree(vp_dev->msix_affinity_masks); 308 vp_dev->msix_affinity_masks = NULL; 309 kfree(vp_dev->vqs); 310 vp_dev->vqs = NULL; 311 } 312 313 static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs, 314 struct virtqueue *vqs[], vq_callback_t *callbacks[], 315 const char * const names[], bool per_vq_vectors, 316 const bool *ctx, 317 struct irq_affinity *desc) 318 { 319 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 320 u16 msix_vec; 321 int i, err, nvectors, allocated_vectors, queue_idx = 0; 322 323 vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL); 324 if (!vp_dev->vqs) 325 return -ENOMEM; 326 327 if (per_vq_vectors) { 328 /* Best option: one for change interrupt, one per vq. */ 329 nvectors = 1; 330 for (i = 0; i < nvqs; ++i) 331 if (names[i] && callbacks[i]) 332 ++nvectors; 333 } else { 334 /* Second best: one for change, shared for all vqs. */ 335 nvectors = 2; 336 } 337 338 err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors, 339 per_vq_vectors ? desc : NULL); 340 if (err) 341 goto error_find; 342 343 vp_dev->per_vq_vectors = per_vq_vectors; 344 allocated_vectors = vp_dev->msix_used_vectors; 345 for (i = 0; i < nvqs; ++i) { 346 if (!names[i]) { 347 vqs[i] = NULL; 348 continue; 349 } 350 351 if (!callbacks[i]) 352 msix_vec = VIRTIO_MSI_NO_VECTOR; 353 else if (vp_dev->per_vq_vectors) 354 msix_vec = allocated_vectors++; 355 else 356 msix_vec = VP_MSIX_VQ_VECTOR; 357 vqs[i] = vp_setup_vq(vdev, queue_idx++, callbacks[i], names[i], 358 ctx ? ctx[i] : false, 359 msix_vec); 360 if (IS_ERR(vqs[i])) { 361 err = PTR_ERR(vqs[i]); 362 goto error_find; 363 } 364 365 if (!vp_dev->per_vq_vectors || msix_vec == VIRTIO_MSI_NO_VECTOR) 366 continue; 367 368 /* allocate per-vq irq if available and necessary */ 369 snprintf(vp_dev->msix_names[msix_vec], 370 sizeof *vp_dev->msix_names, 371 "%s-%s", 372 dev_name(&vp_dev->vdev.dev), names[i]); 373 err = request_irq(pci_irq_vector(vp_dev->pci_dev, msix_vec), 374 vring_interrupt, IRQF_NO_AUTOEN, 375 vp_dev->msix_names[msix_vec], 376 vqs[i]); 377 if (err) 378 goto error_find; 379 } 380 return 0; 381 382 error_find: 383 vp_del_vqs(vdev); 384 return err; 385 } 386 387 static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned nvqs, 388 struct virtqueue *vqs[], vq_callback_t *callbacks[], 389 const char * const names[], const bool *ctx) 390 { 391 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 392 int i, err, queue_idx = 0; 393 394 vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL); 395 if (!vp_dev->vqs) 396 return -ENOMEM; 397 398 err = request_irq(vp_dev->pci_dev->irq, vp_interrupt, IRQF_SHARED, 399 dev_name(&vdev->dev), vp_dev); 400 if (err) 401 goto out_del_vqs; 402 403 vp_dev->intx_enabled = 1; 404 vp_dev->per_vq_vectors = false; 405 for (i = 0; i < nvqs; ++i) { 406 if (!names[i]) { 407 vqs[i] = NULL; 408 continue; 409 } 410 vqs[i] = vp_setup_vq(vdev, queue_idx++, callbacks[i], names[i], 411 ctx ? ctx[i] : false, 412 VIRTIO_MSI_NO_VECTOR); 413 if (IS_ERR(vqs[i])) { 414 err = PTR_ERR(vqs[i]); 415 goto out_del_vqs; 416 } 417 } 418 419 return 0; 420 out_del_vqs: 421 vp_del_vqs(vdev); 422 return err; 423 } 424 425 /* the config->find_vqs() implementation */ 426 int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs, 427 struct virtqueue *vqs[], vq_callback_t *callbacks[], 428 const char * const names[], const bool *ctx, 429 struct irq_affinity *desc) 430 { 431 int err; 432 433 /* Try MSI-X with one vector per queue. */ 434 err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, true, ctx, desc); 435 if (!err) 436 return 0; 437 /* Fallback: MSI-X with one vector for config, one shared for queues. */ 438 err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, false, ctx, desc); 439 if (!err) 440 return 0; 441 /* Finally fall back to regular interrupts. */ 442 return vp_find_vqs_intx(vdev, nvqs, vqs, callbacks, names, ctx); 443 } 444 445 const char *vp_bus_name(struct virtio_device *vdev) 446 { 447 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 448 449 return pci_name(vp_dev->pci_dev); 450 } 451 452 /* Setup the affinity for a virtqueue: 453 * - force the affinity for per vq vector 454 * - OR over all affinities for shared MSI 455 * - ignore the affinity request if we're using INTX 456 */ 457 int vp_set_vq_affinity(struct virtqueue *vq, const struct cpumask *cpu_mask) 458 { 459 struct virtio_device *vdev = vq->vdev; 460 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 461 struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index]; 462 struct cpumask *mask; 463 unsigned int irq; 464 465 if (!vq->callback) 466 return -EINVAL; 467 468 if (vp_dev->msix_enabled) { 469 mask = vp_dev->msix_affinity_masks[info->msix_vector]; 470 irq = pci_irq_vector(vp_dev->pci_dev, info->msix_vector); 471 if (!cpu_mask) 472 irq_set_affinity_hint(irq, NULL); 473 else { 474 cpumask_copy(mask, cpu_mask); 475 irq_set_affinity_hint(irq, mask); 476 } 477 } 478 return 0; 479 } 480 481 const struct cpumask *vp_get_vq_affinity(struct virtio_device *vdev, int index) 482 { 483 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 484 485 if (!vp_dev->per_vq_vectors || 486 vp_dev->vqs[index]->msix_vector == VIRTIO_MSI_NO_VECTOR) 487 return NULL; 488 489 return pci_irq_get_affinity(vp_dev->pci_dev, 490 vp_dev->vqs[index]->msix_vector); 491 } 492 493 #ifdef CONFIG_PM_SLEEP 494 static int virtio_pci_freeze(struct device *dev) 495 { 496 struct pci_dev *pci_dev = to_pci_dev(dev); 497 struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); 498 int ret; 499 500 ret = virtio_device_freeze(&vp_dev->vdev); 501 502 if (!ret) 503 pci_disable_device(pci_dev); 504 return ret; 505 } 506 507 static int virtio_pci_restore(struct device *dev) 508 { 509 struct pci_dev *pci_dev = to_pci_dev(dev); 510 struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); 511 int ret; 512 513 ret = pci_enable_device(pci_dev); 514 if (ret) 515 return ret; 516 517 pci_set_master(pci_dev); 518 return virtio_device_restore(&vp_dev->vdev); 519 } 520 521 static const struct dev_pm_ops virtio_pci_pm_ops = { 522 SET_SYSTEM_SLEEP_PM_OPS(virtio_pci_freeze, virtio_pci_restore) 523 }; 524 #endif 525 526 527 /* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */ 528 static const struct pci_device_id virtio_pci_id_table[] = { 529 { PCI_DEVICE(PCI_VENDOR_ID_REDHAT_QUMRANET, PCI_ANY_ID) }, 530 { 0 } 531 }; 532 533 MODULE_DEVICE_TABLE(pci, virtio_pci_id_table); 534 535 static void virtio_pci_release_dev(struct device *_d) 536 { 537 struct virtio_device *vdev = dev_to_virtio(_d); 538 struct virtio_pci_device *vp_dev = to_vp_device(vdev); 539 540 /* As struct device is a kobject, it's not safe to 541 * free the memory (including the reference counter itself) 542 * until it's release callback. */ 543 kfree(vp_dev); 544 } 545 546 static int virtio_pci_probe(struct pci_dev *pci_dev, 547 const struct pci_device_id *id) 548 { 549 struct virtio_pci_device *vp_dev, *reg_dev = NULL; 550 int rc; 551 552 /* allocate our structure and fill it out */ 553 vp_dev = kzalloc(sizeof(struct virtio_pci_device), GFP_KERNEL); 554 if (!vp_dev) 555 return -ENOMEM; 556 557 pci_set_drvdata(pci_dev, vp_dev); 558 vp_dev->vdev.dev.parent = &pci_dev->dev; 559 vp_dev->vdev.dev.release = virtio_pci_release_dev; 560 vp_dev->pci_dev = pci_dev; 561 INIT_LIST_HEAD(&vp_dev->virtqueues); 562 spin_lock_init(&vp_dev->lock); 563 564 /* enable the device */ 565 rc = pci_enable_device(pci_dev); 566 if (rc) 567 goto err_enable_device; 568 569 if (force_legacy) { 570 rc = virtio_pci_legacy_probe(vp_dev); 571 /* Also try modern mode if we can't map BAR0 (no IO space). */ 572 if (rc == -ENODEV || rc == -ENOMEM) 573 rc = virtio_pci_modern_probe(vp_dev); 574 if (rc) 575 goto err_probe; 576 } else { 577 rc = virtio_pci_modern_probe(vp_dev); 578 if (rc == -ENODEV) 579 rc = virtio_pci_legacy_probe(vp_dev); 580 if (rc) 581 goto err_probe; 582 } 583 584 pci_set_master(pci_dev); 585 586 vp_dev->is_legacy = vp_dev->ldev.ioaddr ? true : false; 587 588 rc = register_virtio_device(&vp_dev->vdev); 589 reg_dev = vp_dev; 590 if (rc) 591 goto err_register; 592 593 return 0; 594 595 err_register: 596 if (vp_dev->is_legacy) 597 virtio_pci_legacy_remove(vp_dev); 598 else 599 virtio_pci_modern_remove(vp_dev); 600 err_probe: 601 pci_disable_device(pci_dev); 602 err_enable_device: 603 if (reg_dev) 604 put_device(&vp_dev->vdev.dev); 605 else 606 kfree(vp_dev); 607 return rc; 608 } 609 610 static void virtio_pci_remove(struct pci_dev *pci_dev) 611 { 612 struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); 613 struct device *dev = get_device(&vp_dev->vdev.dev); 614 615 /* 616 * Device is marked broken on surprise removal so that virtio upper 617 * layers can abort any ongoing operation. 618 */ 619 if (!pci_device_is_present(pci_dev)) 620 virtio_break_device(&vp_dev->vdev); 621 622 pci_disable_sriov(pci_dev); 623 624 unregister_virtio_device(&vp_dev->vdev); 625 626 if (vp_dev->is_legacy) 627 virtio_pci_legacy_remove(vp_dev); 628 else 629 virtio_pci_modern_remove(vp_dev); 630 631 pci_disable_device(pci_dev); 632 put_device(dev); 633 } 634 635 static int virtio_pci_sriov_configure(struct pci_dev *pci_dev, int num_vfs) 636 { 637 struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); 638 struct virtio_device *vdev = &vp_dev->vdev; 639 int ret; 640 641 if (!(vdev->config->get_status(vdev) & VIRTIO_CONFIG_S_DRIVER_OK)) 642 return -EBUSY; 643 644 if (!__virtio_test_bit(vdev, VIRTIO_F_SR_IOV)) 645 return -EINVAL; 646 647 if (pci_vfs_assigned(pci_dev)) 648 return -EPERM; 649 650 if (num_vfs == 0) { 651 pci_disable_sriov(pci_dev); 652 return 0; 653 } 654 655 ret = pci_enable_sriov(pci_dev, num_vfs); 656 if (ret < 0) 657 return ret; 658 659 return num_vfs; 660 } 661 662 static struct pci_driver virtio_pci_driver = { 663 .name = "virtio-pci", 664 .id_table = virtio_pci_id_table, 665 .probe = virtio_pci_probe, 666 .remove = virtio_pci_remove, 667 #ifdef CONFIG_PM_SLEEP 668 .driver.pm = &virtio_pci_pm_ops, 669 #endif 670 .sriov_configure = virtio_pci_sriov_configure, 671 }; 672 673 module_pci_driver(virtio_pci_driver); 674 675 MODULE_AUTHOR("Anthony Liguori <aliguori@us.ibm.com>"); 676 MODULE_DESCRIPTION("virtio-pci"); 677 MODULE_LICENSE("GPL"); 678 MODULE_VERSION("1"); 679