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, dev->irq_name, (void *)dev))
 235                 return -EIO;
 236         return 0;
 237 }
 238
 239 #ifdef __KVM_HAVE_MSI
 240 static int assigned_device_enable_host_msi(struct kvm *kvm,
 241                                            struct kvm_assigned_dev_kernel *dev)
 242 {
 243         int r;
 244
 245         if (!dev->dev->msi_enabled) {
 246                 r = pci_enable_msi(dev->dev);
 247                 if (r)
 248                         return r;
 249         }
 250
 251         dev->host_irq = dev->dev->irq;
 252         if (request_threaded_irq(dev->host_irq, NULL, kvm_assigned_dev_thread,
 253                                  0, dev->irq_name, (void *)dev)) {
 254                 pci_disable_msi(dev->dev);
 255                 return -EIO;
 256         }
 257
 258         return 0;
 259 }
 260 #endif
 261
 262 #ifdef __KVM_HAVE_MSIX
 263 static int assigned_device_enable_host_msix(struct kvm *kvm,
 264                                             struct kvm_assigned_dev_kernel *dev)
 265 {
 266         int i, r = -EINVAL;
 267
 268         /* host_msix_entries and guest_msix_entries should have been
 269          * initialized */
 270         if (dev->entries_nr == 0)
 271                 return r;
 272
 273         r = pci_enable_msix(dev->dev, dev->host_msix_entries, dev->entries_nr);
 274         if (r)
 275                 return r;
 276
 277         for (i = 0; i < dev->entries_nr; i++) {
 278                 r = request_threaded_irq(dev->host_msix_entries[i].vector,
 279                                          NULL, kvm_assigned_dev_thread,
 280                                          0, dev->irq_name, (void *)dev);
 281                 if (r)
 282                         goto err;
 283         }
 284
 285         return 0;
 286 err:
 287         for (i -= 1; i >= 0; i--)
 288                 free_irq(dev->host_msix_entries[i].vector, (void *)dev);
 289         pci_disable_msix(dev->dev);
 290         return r;
 291 }
 292
 293 #endif
 294
 295 static int assigned_device_enable_guest_intx(struct kvm *kvm,
 296                                 struct kvm_assigned_dev_kernel *dev,
 297                                 struct kvm_assigned_irq *irq)
 298 {
 299         dev->guest_irq = irq->guest_irq;
 300         dev->ack_notifier.gsi = irq->guest_irq;
 301         return 0;
 302 }
 303
 304 #ifdef __KVM_HAVE_MSI
 305 static int assigned_device_enable_guest_msi(struct kvm *kvm,
 306                         struct kvm_assigned_dev_kernel *dev,
 307                         struct kvm_assigned_irq *irq)
 308 {
 309         dev->guest_irq = irq->guest_irq;
 310         dev->ack_notifier.gsi = -1;
 311         dev->host_irq_disabled = false;
 312         return 0;
 313 }
 314 #endif
 315
 316 #ifdef __KVM_HAVE_MSIX
 317 static int assigned_device_enable_guest_msix(struct kvm *kvm,
 318                         struct kvm_assigned_dev_kernel *dev,
 319                         struct kvm_assigned_irq *irq)
 320 {
 321         dev->guest_irq = irq->guest_irq;
 322         dev->ack_notifier.gsi = -1;
 323         dev->host_irq_disabled = false;
 324         return 0;
 325 }
 326 #endif
 327
 328 static int assign_host_irq(struct kvm *kvm,
 329                            struct kvm_assigned_dev_kernel *dev,
 330                            __u32 host_irq_type)
 331 {
 332         int r = -EEXIST;
 333
 334         if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_MASK)
 335                 return r;
 336
 337         snprintf(dev->irq_name, sizeof(dev->irq_name), "kvm:%s",
 338                  pci_name(dev->dev));
 339
 340         switch (host_irq_type) {
 341         case KVM_DEV_IRQ_HOST_INTX:
 342                 r = assigned_device_enable_host_intx(kvm, dev);
 343                 break;
 344 #ifdef __KVM_HAVE_MSI
 345         case KVM_DEV_IRQ_HOST_MSI:
 346                 r = assigned_device_enable_host_msi(kvm, dev);
 347                 break;
 348 #endif
 349 #ifdef __KVM_HAVE_MSIX
 350         case KVM_DEV_IRQ_HOST_MSIX:
 351                 r = assigned_device_enable_host_msix(kvm, dev);
 352                 break;
 353 #endif
 354         default:
 355                 r = -EINVAL;
 356         }
 357
 358         if (!r)
 359                 dev->irq_requested_type |= host_irq_type;
 360
 361         return r;
 362 }
 363
 364 static int assign_guest_irq(struct kvm *kvm,
 365                             struct kvm_assigned_dev_kernel *dev,
 366                             struct kvm_assigned_irq *irq,
 367                             unsigned long guest_irq_type)
 368 {
 369         int id;
 370         int r = -EEXIST;
 371
 372         if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK)
 373                 return r;
 374
 375         id = kvm_request_irq_source_id(kvm);
 376         if (id < 0)
 377                 return id;
 378
 379         dev->irq_source_id = id;
 380
 381         switch (guest_irq_type) {
 382         case KVM_DEV_IRQ_GUEST_INTX:
 383                 r = assigned_device_enable_guest_intx(kvm, dev, irq);
 384                 break;
 385 #ifdef __KVM_HAVE_MSI
 386         case KVM_DEV_IRQ_GUEST_MSI:
 387                 r = assigned_device_enable_guest_msi(kvm, dev, irq);
 388                 break;
 389 #endif
 390 #ifdef __KVM_HAVE_MSIX
 391         case KVM_DEV_IRQ_GUEST_MSIX:
 392                 r = assigned_device_enable_guest_msix(kvm, dev, irq);
 393                 break;
 394 #endif
 395         default:
 396                 r = -EINVAL;
 397         }
 398
 399         if (!r) {
 400                 dev->irq_requested_type |= guest_irq_type;
 401                 kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier);
 402         } else
 403                 kvm_free_irq_source_id(kvm, dev->irq_source_id);
 404
 405         return r;
 406 }
 407
 408 /* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
 409 static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
 410                                    struct kvm_assigned_irq *assigned_irq)
 411 {
 412         int r = -EINVAL;
 413         struct kvm_assigned_dev_kernel *match;
 414         unsigned long host_irq_type, guest_irq_type;
 415
 416         if (!irqchip_in_kernel(kvm))
 417                 return r;
 418
 419         mutex_lock(&kvm->lock);
 420         r = -ENODEV;
 421         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 422                                       assigned_irq->assigned_dev_id);
 423         if (!match)
 424                 goto out;
 425
 426         host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK);
 427         guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK);
 428
 429         r = -EINVAL;
 430         /* can only assign one type at a time */
 431         if (hweight_long(host_irq_type) > 1)
 432                 goto out;
 433         if (hweight_long(guest_irq_type) > 1)
 434                 goto out;
 435         if (host_irq_type == 0 && guest_irq_type == 0)
 436                 goto out;
 437
 438         r = 0;
 439         if (host_irq_type)
 440                 r = assign_host_irq(kvm, match, host_irq_type);
 441         if (r)
 442                 goto out;
 443
 444         if (guest_irq_type)
 445                 r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type);
 446 out:
 447         mutex_unlock(&kvm->lock);
 448         return r;
 449 }
 450
 451 static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
 452                                          struct kvm_assigned_irq
 453                                          *assigned_irq)
 454 {
 455         int r = -ENODEV;
 456         struct kvm_assigned_dev_kernel *match;
 457
 458         mutex_lock(&kvm->lock);
 459
 460         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 461                                       assigned_irq->assigned_dev_id);
 462         if (!match)
 463                 goto out;
 464
 465         r = kvm_deassign_irq(kvm, match, assigned_irq->flags);
 466 out:
 467         mutex_unlock(&kvm->lock);
 468         return r;
 469 }
 470
 471 static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
 472                                       struct kvm_assigned_pci_dev *assigned_dev)
 473 {
 474         int r = 0, idx;
 475         struct kvm_assigned_dev_kernel *match;
 476         struct pci_dev *dev;
 477
 478         mutex_lock(&kvm->lock);
 479         idx = srcu_read_lock(&kvm->srcu);
 480
 481         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 482                                       assigned_dev->assigned_dev_id);
 483         if (match) {
 484                 /* device already assigned */
 485                 r = -EEXIST;
 486                 goto out;
 487         }
 488
 489         match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
 490         if (match == NULL) {
 491                 printk(KERN_INFO "%s: Couldn't allocate memory\n",
 492                        __func__);
 493                 r = -ENOMEM;
 494                 goto out;
 495         }
 496         dev = pci_get_domain_bus_and_slot(assigned_dev->segnr,
 497                                    assigned_dev->busnr,
 498                                    assigned_dev->devfn);
 499         if (!dev) {
 500                 printk(KERN_INFO "%s: host device not found\n", __func__);
 501                 r = -EINVAL;
 502                 goto out_free;
 503         }
 504         if (pci_enable_device(dev)) {
 505                 printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
 506                 r = -EBUSY;
 507                 goto out_put;
 508         }
 509         r = pci_request_regions(dev, "kvm_assigned_device");
 510         if (r) {
 511                 printk(KERN_INFO "%s: Could not get access to device regions\n",
 512                        __func__);
 513                 goto out_disable;
 514         }
 515
 516         pci_reset_function(dev);
 517
 518         match->assigned_dev_id = assigned_dev->assigned_dev_id;
 519         match->host_segnr = assigned_dev->segnr;
 520         match->host_busnr = assigned_dev->busnr;
 521         match->host_devfn = assigned_dev->devfn;
 522         match->flags = assigned_dev->flags;
 523         match->dev = dev;
 524         spin_lock_init(&match->intx_lock);
 525         match->irq_source_id = -1;
 526         match->kvm = kvm;
 527         match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
 528
 529         list_add(&match->list, &kvm->arch.assigned_dev_head);
 530
 531         if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
 532                 if (!kvm->arch.iommu_domain) {
 533                         r = kvm_iommu_map_guest(kvm);
 534                         if (r)
 535                                 goto out_list_del;
 536                 }
 537                 r = kvm_assign_device(kvm, match);
 538                 if (r)
 539                         goto out_list_del;
 540         }
 541
 542 out:
 543         srcu_read_unlock(&kvm->srcu, idx);
 544         mutex_unlock(&kvm->lock);
 545         return r;
 546 out_list_del:
 547         list_del(&match->list);
 548         pci_release_regions(dev);
 549 out_disable:
 550         pci_disable_device(dev);
 551 out_put:
 552         pci_dev_put(dev);
 553 out_free:
 554         kfree(match);
 555         srcu_read_unlock(&kvm->srcu, idx);
 556         mutex_unlock(&kvm->lock);
 557         return r;
 558 }
 559
 560 static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
 561                 struct kvm_assigned_pci_dev *assigned_dev)
 562 {
 563         int r = 0;
 564         struct kvm_assigned_dev_kernel *match;
 565
 566         mutex_lock(&kvm->lock);
 567
 568         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 569                                       assigned_dev->assigned_dev_id);
 570         if (!match) {
 571                 printk(KERN_INFO "%s: device hasn't been assigned before, "
 572                   "so cannot be deassigned\n", __func__);
 573                 r = -EINVAL;
 574                 goto out;
 575         }
 576
 577         if (match->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU)
 578                 kvm_deassign_device(kvm, match);
 579
 580         kvm_free_assigned_device(kvm, match);
 581
 582 out:
 583         mutex_unlock(&kvm->lock);
 584         return r;
 585 }
 586
 587
 588 #ifdef __KVM_HAVE_MSIX
 589 static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
 590                                     struct kvm_assigned_msix_nr *entry_nr)
 591 {
 592         int r = 0;
 593         struct kvm_assigned_dev_kernel *adev;
 594
 595         mutex_lock(&kvm->lock);
 596
 597         adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 598                                       entry_nr->assigned_dev_id);
 599         if (!adev) {
 600                 r = -EINVAL;
 601                 goto msix_nr_out;
 602         }
 603
 604         if (adev->entries_nr == 0) {
 605                 adev->entries_nr = entry_nr->entry_nr;
 606                 if (adev->entries_nr == 0 ||
 607                     adev->entries_nr >= KVM_MAX_MSIX_PER_DEV) {
 608                         r = -EINVAL;
 609                         goto msix_nr_out;
 610                 }
 611
 612                 adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) *
 613                                                 entry_nr->entry_nr,
 614                                                 GFP_KERNEL);
 615                 if (!adev->host_msix_entries) {
 616                         r = -ENOMEM;
 617                         goto msix_nr_out;
 618                 }
 619                 adev->guest_msix_entries =
 620                         kzalloc(sizeof(struct msix_entry) * entry_nr->entry_nr,
 621                                 GFP_KERNEL);
 622                 if (!adev->guest_msix_entries) {
 623                         kfree(adev->host_msix_entries);
 624                         r = -ENOMEM;
 625                         goto msix_nr_out;
 626                 }
 627         } else /* Not allowed set MSI-X number twice */
 628                 r = -EINVAL;
 629 msix_nr_out:
 630         mutex_unlock(&kvm->lock);
 631         return r;
 632 }
 633
 634 static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm,
 635                                        struct kvm_assigned_msix_entry *entry)
 636 {
 637         int r = 0, i;
 638         struct kvm_assigned_dev_kernel *adev;
 639
 640         mutex_lock(&kvm->lock);
 641
 642         adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 643                                       entry->assigned_dev_id);
 644
 645         if (!adev) {
 646                 r = -EINVAL;
 647                 goto msix_entry_out;
 648         }
 649
 650         for (i = 0; i < adev->entries_nr; i++)
 651                 if (adev->guest_msix_entries[i].vector == 0 ||
 652                     adev->guest_msix_entries[i].entry == entry->entry) {
 653                         adev->guest_msix_entries[i].entry = entry->entry;
 654                         adev->guest_msix_entries[i].vector = entry->gsi;
 655                         adev->host_msix_entries[i].entry = entry->entry;
 656                         break;
 657                 }
 658         if (i == adev->entries_nr) {
 659                 r = -ENOSPC;
 660                 goto msix_entry_out;
 661         }
 662
 663 msix_entry_out:
 664         mutex_unlock(&kvm->lock);
 665
 666         return r;
 667 }
 668 #endif
 669
 670 long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 671                                   unsigned long arg)
 672 {
 673         void __user *argp = (void __user *)arg;
 674         int r;
 675
 676         switch (ioctl) {
 677         case KVM_ASSIGN_PCI_DEVICE: {
 678                 struct kvm_assigned_pci_dev assigned_dev;
 679
 680                 r = -EFAULT;
 681                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
 682                         goto out;
 683                 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
 684                 if (r)
 685                         goto out;
 686                 break;
 687         }
 688         case KVM_ASSIGN_IRQ: {
 689                 r = -EOPNOTSUPP;
 690                 break;
 691         }
 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         case KVM_DEASSIGN_PCI_DEVICE: {
 715                 struct kvm_assigned_pci_dev assigned_dev;
 716
 717                 r = -EFAULT;
 718                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
 719                         goto out;
 720                 r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
 721                 if (r)
 722                         goto out;
 723                 break;
 724         }
 725 #ifdef KVM_CAP_IRQ_ROUTING
 726         case KVM_SET_GSI_ROUTING: {
 727                 struct kvm_irq_routing routing;
 728                 struct kvm_irq_routing __user *urouting;
 729                 struct kvm_irq_routing_entry *entries;
 730
 731                 r = -EFAULT;
 732                 if (copy_from_user(&routing, argp, sizeof(routing)))
 733                         goto out;
 734                 r = -EINVAL;
 735                 if (routing.nr >= KVM_MAX_IRQ_ROUTES)
 736                         goto out;
 737                 if (routing.flags)
 738                         goto out;
 739                 r = -ENOMEM;
 740                 entries = vmalloc(routing.nr * sizeof(*entries));
 741                 if (!entries)
 742                         goto out;
 743                 r = -EFAULT;
 744                 urouting = argp;
 745                 if (copy_from_user(entries, urouting->entries,
 746                                    routing.nr * sizeof(*entries)))
 747                         goto out_free_irq_routing;
 748                 r = kvm_set_irq_routing(kvm, entries, routing.nr,
 749                                         routing.flags);
 750         out_free_irq_routing:
 751                 vfree(entries);
 752                 break;
 753         }
 754 #endif /* KVM_CAP_IRQ_ROUTING */
 755 #ifdef __KVM_HAVE_MSIX
 756         case KVM_ASSIGN_SET_MSIX_NR: {
 757                 struct kvm_assigned_msix_nr entry_nr;
 758                 r = -EFAULT;
 759                 if (copy_from_user(&entry_nr, argp, sizeof entry_nr))
 760                         goto out;
 761                 r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr);
 762                 if (r)
 763                         goto out;
 764                 break;
 765         }
 766         case KVM_ASSIGN_SET_MSIX_ENTRY: {
 767                 struct kvm_assigned_msix_entry entry;
 768                 r = -EFAULT;
 769                 if (copy_from_user(&entry, argp, sizeof entry))
 770                         goto out;
 771                 r = kvm_vm_ioctl_set_msix_entry(kvm, &entry);
 772                 if (r)
 773                         goto out;
 774                 break;
 775         }
 776 #endif
 777         default:
 778                 r = -ENOTTY;
 779                 break;
 780         }
 781 out:
 782         return r;
 783 }
 784