virt/kvm/assigned-dev.c

   1 /*
   2  * Kernel-based Virtual Machine - device assignment support
   3  *
   4  * Copyright (C) 2010 Red Hat, Inc. and/or its affiliates.
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2.  See
   7  * the COPYING file in the top-level directory.
   8  *
   9  */
  10
  11 #include <linux/kvm_host.h>
  12 #include <linux/kvm.h>
  13 #include <linux/uaccess.h>
  14 #include <linux/vmalloc.h>
  15 #include <linux/errno.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/pci.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/slab.h>
  20 #include "irq.h"
  21
  22 static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head *head,
  23                                                       int assigned_dev_id)
  24 {
  25         struct list_head *ptr;
  26         struct kvm_assigned_dev_kernel *match;
  27
  28         list_for_each(ptr, head) {
  29                 match = list_entry(ptr, struct kvm_assigned_dev_kernel, list);
  30                 if (match->assigned_dev_id == assigned_dev_id)
  31                         return match;
  32         }
  33         return NULL;
  34 }
  35
  36 static int find_index_from_host_irq(struct kvm_assigned_dev_kernel
  37                                     *assigned_dev, int irq)
  38 {
  39         int i, index;
  40         struct msix_entry *host_msix_entries;
  41
  42         host_msix_entries = assigned_dev->host_msix_entries;
  43
  44         index = -1;
  45         for (i = 0; i < assigned_dev->entries_nr; i++)
  46                 if (irq == host_msix_entries[i].vector) {
  47                         index = i;
  48                         break;
  49                 }
  50         if (index < 0) {
  51                 printk(KERN_WARNING "Fail to find correlated MSI-X entry!\n");
  52                 return 0;
  53         }
  54
  55         return index;
  56 }
  57
  58 static irqreturn_t kvm_assigned_dev_thread(int irq, void *dev_id)
  59 {
  60         struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
  61         u32 vector;
  62         int index;
  63
  64         if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_INTX) {
  65                 spin_lock(&assigned_dev->intx_lock);
  66                 disable_irq_nosync(irq);
  67                 assigned_dev->host_irq_disabled = true;
  68                 spin_unlock(&assigned_dev->intx_lock);
  69         }
  70
  71         if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
  72                 index = find_index_from_host_irq(assigned_dev, irq);
  73                 if (index >= 0) {
  74                         vector = assigned_dev->
  75                                         guest_msix_entries[index].vector;
  76                         kvm_set_irq(assigned_dev->kvm,
  77                                     assigned_dev->irq_source_id, vector, 1);
  78                 }
  79         } else
  80                 kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
  81                             assigned_dev->guest_irq, 1);
  82
  83         return IRQ_HANDLED;
  84 }
  85
  86 /* Ack the irq line for an assigned device */
  87 static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
  88 {
  89         struct kvm_assigned_dev_kernel *dev;
  90
  91         if (kian->gsi == -1)
  92                 return;
  93
  94         dev = container_of(kian, struct kvm_assigned_dev_kernel,
  95                            ack_notifier);
  96
  97         kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0);
  98
  99         /* The guest irq may be shared so this ack may be
 100          * from another device.
 101          */
 102         spin_lock(&dev->intx_lock);
 103         if (dev->host_irq_disabled) {
 104                 enable_irq(dev->host_irq);
 105                 dev->host_irq_disabled = false;
 106         }
 107         spin_unlock(&dev->intx_lock);
 108 }
 109
 110 static void deassign_guest_irq(struct kvm *kvm,
 111                                struct kvm_assigned_dev_kernel *assigned_dev)
 112 {
 113         kvm_unregister_irq_ack_notifier(kvm, &assigned_dev->ack_notifier);
 114         assigned_dev->ack_notifier.gsi = -1;
 115
 116         kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
 117                     assigned_dev->guest_irq, 0);
 118
 119         if (assigned_dev->irq_source_id != -1)
 120                 kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
 121         assigned_dev->irq_source_id = -1;
 122         assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_GUEST_MASK);
 123 }
 124
 125 /* The function implicit hold kvm->lock mutex due to cancel_work_sync() */
 126 static void deassign_host_irq(struct kvm *kvm,
 127                               struct kvm_assigned_dev_kernel *assigned_dev)
 128 {
 129         /*
 130          * We disable irq here to prevent further events.
 131          *
 132          * Notice this maybe result in nested disable if the interrupt type is
 133          * INTx, but it's OK for we are going to free it.
 134          *
 135          * If this function is a part of VM destroy, please ensure that till
 136          * now, the kvm state is still legal for probably we also have to wait
 137          * on a currently running IRQ handler.
 138          */
 139         if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
 140                 int i;
 141                 for (i = 0; i < assigned_dev->entries_nr; i++)
 142                         disable_irq(assigned_dev->host_msix_entries[i].vector);
 143
 144                 for (i = 0; i < assigned_dev->entries_nr; i++)
 145                         free_irq(assigned_dev->host_msix_entries[i].vector,
 146                                  (void *)assigned_dev);
 147
 148                 assigned_dev->entries_nr = 0;
 149                 kfree(assigned_dev->host_msix_entries);
 150                 kfree(assigned_dev->guest_msix_entries);
 151                 pci_disable_msix(assigned_dev->dev);
 152         } else {
 153                 /* Deal with MSI and INTx */
 154                 disable_irq(assigned_dev->host_irq);
 155
 156                 free_irq(assigned_dev->host_irq, (void *)assigned_dev);
 157
 158                 if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSI)
 159                         pci_disable_msi(assigned_dev->dev);
 160         }
 161
 162         assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_HOST_MASK);
 163 }
 164
 165 static int kvm_deassign_irq(struct kvm *kvm,
 166                             struct kvm_assigned_dev_kernel *assigned_dev,
 167                             unsigned long irq_requested_type)
 168 {
 169         unsigned long guest_irq_type, host_irq_type;
 170
 171         if (!irqchip_in_kernel(kvm))
 172                 return -EINVAL;
 173         /* no irq assignment to deassign */
 174         if (!assigned_dev->irq_requested_type)
 175                 return -ENXIO;
 176
 177         host_irq_type = irq_requested_type & KVM_DEV_IRQ_HOST_MASK;
 178         guest_irq_type = irq_requested_type & KVM_DEV_IRQ_GUEST_MASK;
 179
 180         if (host_irq_type)
 181                 deassign_host_irq(kvm, assigned_dev);
 182         if (guest_irq_type)
 183                 deassign_guest_irq(kvm, assigned_dev);
 184
 185         return 0;
 186 }
 187
 188 static void kvm_free_assigned_irq(struct kvm *kvm,
 189                                   struct kvm_assigned_dev_kernel *assigned_dev)
 190 {
 191         kvm_deassign_irq(kvm, assigned_dev, assigned_dev->irq_requested_type);
 192 }
 193
 194 static void kvm_free_assigned_device(struct kvm *kvm,
 195                                      struct kvm_assigned_dev_kernel
 196                                      *assigned_dev)
 197 {
 198         kvm_free_assigned_irq(kvm, assigned_dev);
 199
 200         pci_reset_function(assigned_dev->dev);
 201
 202         pci_release_regions(assigned_dev->dev);
 203         pci_disable_device(assigned_dev->dev);
 204         pci_dev_put(assigned_dev->dev);
 205
 206         list_del(&assigned_dev->list);
 207         kfree(assigned_dev);
 208 }
 209
 210 void kvm_free_all_assigned_devices(struct kvm *kvm)
 211 {
 212         struct list_head *ptr, *ptr2;
 213         struct kvm_assigned_dev_kernel *assigned_dev;
 214
 215         list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
 216                 assigned_dev = list_entry(ptr,
 217                                           struct kvm_assigned_dev_kernel,
 218                                           list);
 219
 220                 kvm_free_assigned_device(kvm, assigned_dev);
 221         }
 222 }
 223
 224 static int assigned_device_enable_host_intx(struct kvm *kvm,
 225                                             struct kvm_assigned_dev_kernel *dev)
 226 {
 227         dev->host_irq = dev->dev->irq;
 228         /* Even though this is PCI, we don't want to use shared
 229          * interrupts. Sharing host devices with guest-assigned devices
 230          * on the same interrupt line is not a happy situation: there
 231          * are going to be long delays in accepting, acking, etc.
 232          */
 233         if (request_threaded_irq(dev->host_irq, NULL, kvm_assigned_dev_thread,
 234                                  IRQF_ONESHOT, "kvm_assigned_intx_device",
 235                                  (void *)dev))
 236                 return -EIO;
 237         return 0;
 238 }
 239
 240 #ifdef __KVM_HAVE_MSI
 241 static int assigned_device_enable_host_msi(struct kvm *kvm,
 242                                            struct kvm_assigned_dev_kernel *dev)
 243 {
 244         int r;
 245
 246         if (!dev->dev->msi_enabled) {
 247                 r = pci_enable_msi(dev->dev);
 248                 if (r)
 249                         return r;
 250         }
 251
 252         dev->host_irq = dev->dev->irq;
 253         if (request_threaded_irq(dev->host_irq, NULL, kvm_assigned_dev_thread,
 254                                  0, "kvm_assigned_msi_device", (void *)dev)) {
 255                 pci_disable_msi(dev->dev);
 256                 return -EIO;
 257         }
 258
 259         return 0;
 260 }
 261 #endif
 262
 263 #ifdef __KVM_HAVE_MSIX
 264 static int assigned_device_enable_host_msix(struct kvm *kvm,
 265                                             struct kvm_assigned_dev_kernel *dev)
 266 {
 267         int i, r = -EINVAL;
 268
 269         /* host_msix_entries and guest_msix_entries should have been
 270          * initialized */
 271         if (dev->entries_nr == 0)
 272                 return r;
 273
 274         r = pci_enable_msix(dev->dev, dev->host_msix_entries, dev->entries_nr);
 275         if (r)
 276                 return r;
 277
 278         for (i = 0; i < dev->entries_nr; i++) {
 279                 r = request_threaded_irq(dev->host_msix_entries[i].vector,
 280                                          NULL, kvm_assigned_dev_thread,
 281                                          0, "kvm_assigned_msix_device",
 282                                          (void *)dev);
 283                 if (r)
 284                         goto err;
 285         }
 286
 287         return 0;
 288 err:
 289         for (i -= 1; i >= 0; i--)
 290                 free_irq(dev->host_msix_entries[i].vector, (void *)dev);
 291         pci_disable_msix(dev->dev);
 292         return r;
 293 }
 294
 295 #endif
 296
 297 static int assigned_device_enable_guest_intx(struct kvm *kvm,
 298                                 struct kvm_assigned_dev_kernel *dev,
 299                                 struct kvm_assigned_irq *irq)
 300 {
 301         dev->guest_irq = irq->guest_irq;
 302         dev->ack_notifier.gsi = irq->guest_irq;
 303         return 0;
 304 }
 305
 306 #ifdef __KVM_HAVE_MSI
 307 static int assigned_device_enable_guest_msi(struct kvm *kvm,
 308                         struct kvm_assigned_dev_kernel *dev,
 309                         struct kvm_assigned_irq *irq)
 310 {
 311         dev->guest_irq = irq->guest_irq;
 312         dev->ack_notifier.gsi = -1;
 313         dev->host_irq_disabled = false;
 314         return 0;
 315 }
 316 #endif
 317
 318 #ifdef __KVM_HAVE_MSIX
 319 static int assigned_device_enable_guest_msix(struct kvm *kvm,
 320                         struct kvm_assigned_dev_kernel *dev,
 321                         struct kvm_assigned_irq *irq)
 322 {
 323         dev->guest_irq = irq->guest_irq;
 324         dev->ack_notifier.gsi = -1;
 325         dev->host_irq_disabled = false;
 326         return 0;
 327 }
 328 #endif
 329
 330 static int assign_host_irq(struct kvm *kvm,
 331                            struct kvm_assigned_dev_kernel *dev,
 332                            __u32 host_irq_type)
 333 {
 334         int r = -EEXIST;
 335
 336         if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_MASK)
 337                 return r;
 338
 339         switch (host_irq_type) {
 340         case KVM_DEV_IRQ_HOST_INTX:
 341                 r = assigned_device_enable_host_intx(kvm, dev);
 342                 break;
 343 #ifdef __KVM_HAVE_MSI
 344         case KVM_DEV_IRQ_HOST_MSI:
 345                 r = assigned_device_enable_host_msi(kvm, dev);
 346                 break;
 347 #endif
 348 #ifdef __KVM_HAVE_MSIX
 349         case KVM_DEV_IRQ_HOST_MSIX:
 350                 r = assigned_device_enable_host_msix(kvm, dev);
 351                 break;
 352 #endif
 353         default:
 354                 r = -EINVAL;
 355         }
 356
 357         if (!r)
 358                 dev->irq_requested_type |= host_irq_type;
 359
 360         return r;
 361 }
 362
 363 static int assign_guest_irq(struct kvm *kvm,
 364                             struct kvm_assigned_dev_kernel *dev,
 365                             struct kvm_assigned_irq *irq,
 366                             unsigned long guest_irq_type)
 367 {
 368         int id;
 369         int r = -EEXIST;
 370
 371         if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK)
 372                 return r;
 373
 374         id = kvm_request_irq_source_id(kvm);
 375         if (id < 0)
 376                 return id;
 377
 378         dev->irq_source_id = id;
 379
 380         switch (guest_irq_type) {
 381         case KVM_DEV_IRQ_GUEST_INTX:
 382                 r = assigned_device_enable_guest_intx(kvm, dev, irq);
 383                 break;
 384 #ifdef __KVM_HAVE_MSI
 385         case KVM_DEV_IRQ_GUEST_MSI:
 386                 r = assigned_device_enable_guest_msi(kvm, dev, irq);
 387                 break;
 388 #endif
 389 #ifdef __KVM_HAVE_MSIX
 390         case KVM_DEV_IRQ_GUEST_MSIX:
 391                 r = assigned_device_enable_guest_msix(kvm, dev, irq);
 392                 break;
 393 #endif
 394         default:
 395                 r = -EINVAL;
 396         }
 397
 398         if (!r) {
 399                 dev->irq_requested_type |= guest_irq_type;
 400                 kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier);
 401         } else
 402                 kvm_free_irq_source_id(kvm, dev->irq_source_id);
 403
 404         return r;
 405 }
 406
 407 /* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
 408 static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
 409                                    struct kvm_assigned_irq *assigned_irq)
 410 {
 411         int r = -EINVAL;
 412         struct kvm_assigned_dev_kernel *match;
 413         unsigned long host_irq_type, guest_irq_type;
 414
 415         if (!irqchip_in_kernel(kvm))
 416                 return r;
 417
 418         mutex_lock(&kvm->lock);
 419         r = -ENODEV;
 420         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 421                                       assigned_irq->assigned_dev_id);
 422         if (!match)
 423                 goto out;
 424
 425         host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK);
 426         guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK);
 427
 428         r = -EINVAL;
 429         /* can only assign one type at a time */
 430         if (hweight_long(host_irq_type) > 1)
 431                 goto out;
 432         if (hweight_long(guest_irq_type) > 1)
 433                 goto out;
 434         if (host_irq_type == 0 && guest_irq_type == 0)
 435                 goto out;
 436
 437         r = 0;
 438         if (host_irq_type)
 439                 r = assign_host_irq(kvm, match, host_irq_type);
 440         if (r)
 441                 goto out;
 442
 443         if (guest_irq_type)
 444                 r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type);
 445 out:
 446         mutex_unlock(&kvm->lock);
 447         return r;
 448 }
 449
 450 static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
 451                                          struct kvm_assigned_irq
 452                                          *assigned_irq)
 453 {
 454         int r = -ENODEV;
 455         struct kvm_assigned_dev_kernel *match;
 456
 457         mutex_lock(&kvm->lock);
 458
 459         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 460                                       assigned_irq->assigned_dev_id);
 461         if (!match)
 462                 goto out;
 463
 464         r = kvm_deassign_irq(kvm, match, assigned_irq->flags);
 465 out:
 466         mutex_unlock(&kvm->lock);
 467         return r;
 468 }
 469
 470 static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
 471                                       struct kvm_assigned_pci_dev *assigned_dev)
 472 {
 473         int r = 0, idx;
 474         struct kvm_assigned_dev_kernel *match;
 475         struct pci_dev *dev;
 476
 477         mutex_lock(&kvm->lock);
 478         idx = srcu_read_lock(&kvm->srcu);
 479
 480         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 481                                       assigned_dev->assigned_dev_id);
 482         if (match) {
 483                 /* device already assigned */
 484                 r = -EEXIST;
 485                 goto out;
 486         }
 487
 488         match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
 489         if (match == NULL) {
 490                 printk(KERN_INFO "%s: Couldn't allocate memory\n",
 491                        __func__);
 492                 r = -ENOMEM;
 493                 goto out;
 494         }
 495         dev = pci_get_domain_bus_and_slot(assigned_dev->segnr,
 496                                    assigned_dev->busnr,
 497                                    assigned_dev->devfn);
 498         if (!dev) {
 499                 printk(KERN_INFO "%s: host device not found\n", __func__);
 500                 r = -EINVAL;
 501                 goto out_free;
 502         }
 503         if (pci_enable_device(dev)) {
 504                 printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
 505                 r = -EBUSY;
 506                 goto out_put;
 507         }
 508         r = pci_request_regions(dev, "kvm_assigned_device");
 509         if (r) {
 510                 printk(KERN_INFO "%s: Could not get access to device regions\n",
 511                        __func__);
 512                 goto out_disable;
 513         }
 514
 515         pci_reset_function(dev);
 516
 517         match->assigned_dev_id = assigned_dev->assigned_dev_id;
 518         match->host_segnr = assigned_dev->segnr;
 519         match->host_busnr = assigned_dev->busnr;
 520         match->host_devfn = assigned_dev->devfn;
 521         match->flags = assigned_dev->flags;
 522         match->dev = dev;
 523         spin_lock_init(&match->intx_lock);
 524         match->irq_source_id = -1;
 525         match->kvm = kvm;
 526         match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
 527
 528         list_add(&match->list, &kvm->arch.assigned_dev_head);
 529
 530         if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
 531                 if (!kvm->arch.iommu_domain) {
 532                         r = kvm_iommu_map_guest(kvm);
 533                         if (r)
 534                                 goto out_list_del;
 535                 }
 536                 r = kvm_assign_device(kvm, match);
 537                 if (r)
 538                         goto out_list_del;
 539         }
 540
 541 out:
 542         srcu_read_unlock(&kvm->srcu, idx);
 543         mutex_unlock(&kvm->lock);
 544         return r;
 545 out_list_del:
 546         list_del(&match->list);
 547         pci_release_regions(dev);
 548 out_disable:
 549         pci_disable_device(dev);
 550 out_put:
 551         pci_dev_put(dev);
 552 out_free:
 553         kfree(match);
 554         srcu_read_unlock(&kvm->srcu, idx);
 555         mutex_unlock(&kvm->lock);
 556         return r;
 557 }
 558
 559 static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
 560                 struct kvm_assigned_pci_dev *assigned_dev)
 561 {
 562         int r = 0;
 563         struct kvm_assigned_dev_kernel *match;
 564
 565         mutex_lock(&kvm->lock);
 566
 567         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 568                                       assigned_dev->assigned_dev_id);
 569         if (!match) {
 570                 printk(KERN_INFO "%s: device hasn't been assigned before, "
 571                   "so cannot be deassigned\n", __func__);
 572                 r = -EINVAL;
 573                 goto out;
 574         }
 575
 576         if (match->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU)
 577                 kvm_deassign_device(kvm, match);
 578
 579         kvm_free_assigned_device(kvm, match);
 580
 581 out:
 582         mutex_unlock(&kvm->lock);
 583         return r;
 584 }
 585
 586
 587 #ifdef __KVM_HAVE_MSIX
 588 static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
 589                                     struct kvm_assigned_msix_nr *entry_nr)
 590 {
 591         int r = 0;
 592         struct kvm_assigned_dev_kernel *adev;
 593
 594         mutex_lock(&kvm->lock);
 595
 596         adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 597                                       entry_nr->assigned_dev_id);
 598         if (!adev) {
 599                 r = -EINVAL;
 600                 goto msix_nr_out;
 601         }
 602
 603         if (adev->entries_nr == 0) {
 604                 adev->entries_nr = entry_nr->entry_nr;
 605                 if (adev->entries_nr == 0 ||
 606                     adev->entries_nr >= KVM_MAX_MSIX_PER_DEV) {
 607                         r = -EINVAL;
 608                         goto msix_nr_out;
 609                 }
 610
 611                 adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) *
 612                                                 entry_nr->entry_nr,
 613                                                 GFP_KERNEL);
 614                 if (!adev->host_msix_entries) {
 615                         r = -ENOMEM;
 616                         goto msix_nr_out;
 617                 }
 618                 adev->guest_msix_entries =
 619                         kzalloc(sizeof(struct msix_entry) * entry_nr->entry_nr,
 620                                 GFP_KERNEL);
 621                 if (!adev->guest_msix_entries) {
 622                         kfree(adev->host_msix_entries);
 623                         r = -ENOMEM;
 624                         goto msix_nr_out;
 625                 }
 626         } else /* Not allowed set MSI-X number twice */
 627                 r = -EINVAL;
 628 msix_nr_out:
 629         mutex_unlock(&kvm->lock);
 630         return r;
 631 }
 632
 633 static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm,
 634                                        struct kvm_assigned_msix_entry *entry)
 635 {
 636         int r = 0, i;
 637         struct kvm_assigned_dev_kernel *adev;
 638
 639         mutex_lock(&kvm->lock);
 640
 641         adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 642                                       entry->assigned_dev_id);
 643
 644         if (!adev) {
 645                 r = -EINVAL;
 646                 goto msix_entry_out;
 647         }
 648
 649         for (i = 0; i < adev->entries_nr; i++)
 650                 if (adev->guest_msix_entries[i].vector == 0 ||
 651                     adev->guest_msix_entries[i].entry == entry->entry) {
 652                         adev->guest_msix_entries[i].entry = entry->entry;
 653                         adev->guest_msix_entries[i].vector = entry->gsi;
 654                         adev->host_msix_entries[i].entry = entry->entry;
 655                         break;
 656                 }
 657         if (i == adev->entries_nr) {
 658                 r = -ENOSPC;
 659                 goto msix_entry_out;
 660         }
 661
 662 msix_entry_out:
 663         mutex_unlock(&kvm->lock);
 664
 665         return r;
 666 }
 667 #endif
 668
 669 long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 670                                   unsigned long arg)
 671 {
 672         void __user *argp = (void __user *)arg;
 673         int r = -ENOTTY;
 674
 675         switch (ioctl) {
 676         case KVM_ASSIGN_PCI_DEVICE: {
 677                 struct kvm_assigned_pci_dev assigned_dev;
 678
 679                 r = -EFAULT;
 680                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
 681                         goto out;
 682                 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
 683                 if (r)
 684                         goto out;
 685                 break;
 686         }
 687         case KVM_ASSIGN_IRQ: {
 688                 r = -EOPNOTSUPP;
 689                 break;
 690         }
 691 #ifdef KVM_CAP_ASSIGN_DEV_IRQ
 692         case KVM_ASSIGN_DEV_IRQ: {
 693                 struct kvm_assigned_irq assigned_irq;
 694
 695                 r = -EFAULT;
 696                 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
 697                         goto out;
 698                 r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
 699                 if (r)
 700                         goto out;
 701                 break;
 702         }
 703         case KVM_DEASSIGN_DEV_IRQ: {
 704                 struct kvm_assigned_irq assigned_irq;
 705
 706                 r = -EFAULT;
 707                 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
 708                         goto out;
 709                 r = kvm_vm_ioctl_deassign_dev_irq(kvm, &assigned_irq);
 710                 if (r)
 711                         goto out;
 712                 break;
 713         }
 714 #endif
 715 #ifdef KVM_CAP_DEVICE_DEASSIGNMENT
 716         case KVM_DEASSIGN_PCI_DEVICE: {
 717                 struct kvm_assigned_pci_dev assigned_dev;
 718
 719                 r = -EFAULT;
 720                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
 721                         goto out;
 722                 r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
 723                 if (r)
 724                         goto out;
 725                 break;
 726         }
 727 #endif
 728 #ifdef KVM_CAP_IRQ_ROUTING
 729         case KVM_SET_GSI_ROUTING: {
 730                 struct kvm_irq_routing routing;
 731                 struct kvm_irq_routing __user *urouting;
 732                 struct kvm_irq_routing_entry *entries;
 733
 734                 r = -EFAULT;
 735                 if (copy_from_user(&routing, argp, sizeof(routing)))
 736                         goto out;
 737                 r = -EINVAL;
 738                 if (routing.nr >= KVM_MAX_IRQ_ROUTES)
 739                         goto out;
 740                 if (routing.flags)
 741                         goto out;
 742                 r = -ENOMEM;
 743                 entries = vmalloc(routing.nr * sizeof(*entries));
 744                 if (!entries)
 745                         goto out;
 746                 r = -EFAULT;
 747                 urouting = argp;
 748                 if (copy_from_user(entries, urouting->entries,
 749                                    routing.nr * sizeof(*entries)))
 750                         goto out_free_irq_routing;
 751                 r = kvm_set_irq_routing(kvm, entries, routing.nr,
 752                                         routing.flags);
 753         out_free_irq_routing:
 754                 vfree(entries);
 755                 break;
 756         }
 757 #endif /* KVM_CAP_IRQ_ROUTING */
 758 #ifdef __KVM_HAVE_MSIX
 759         case KVM_ASSIGN_SET_MSIX_NR: {
 760                 struct kvm_assigned_msix_nr entry_nr;
 761                 r = -EFAULT;
 762                 if (copy_from_user(&entry_nr, argp, sizeof entry_nr))
 763                         goto out;
 764                 r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr);
 765                 if (r)
 766                         goto out;
 767                 break;
 768         }
 769         case KVM_ASSIGN_SET_MSIX_ENTRY: {
 770                 struct kvm_assigned_msix_entry entry;
 771                 r = -EFAULT;
 772                 if (copy_from_user(&entry, argp, sizeof entry))
 773                         goto out;
 774                 r = kvm_vm_ioctl_set_msix_entry(kvm, &entry);
 775                 if (r)
 776                         goto out;
 777                 break;
 778         }
 779 #endif
 780         }
 781 out:
 782         return r;
 783 }
 784