virt/kvm/assigned-dev.c

   1 /*
   2  * Kernel-based Virtual Machine - device assignment support
   3  *
   4  * Copyright (C) 2006-9 Red Hat, Inc
   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 "irq.h"
  20
  21 static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head *head,
  22                                                       int assigned_dev_id)
  23 {
  24         struct list_head *ptr;
  25         struct kvm_assigned_dev_kernel *match;
  26
  27         list_for_each(ptr, head) {
  28                 match = list_entry(ptr, struct kvm_assigned_dev_kernel, list);
  29                 if (match->assigned_dev_id == assigned_dev_id)
  30                         return match;
  31         }
  32         return NULL;
  33 }
  34
  35 static int find_index_from_host_irq(struct kvm_assigned_dev_kernel
  36                                     *assigned_dev, int irq)
  37 {
  38         int i, index;
  39         struct msix_entry *host_msix_entries;
  40
  41         host_msix_entries = assigned_dev->host_msix_entries;
  42
  43         index = -1;
  44         for (i = 0; i < assigned_dev->entries_nr; i++)
  45                 if (irq == host_msix_entries[i].vector) {
  46                         index = i;
  47                         break;
  48                 }
  49         if (index < 0) {
  50                 printk(KERN_WARNING "Fail to find correlated MSI-X entry!\n");
  51                 return 0;
  52         }
  53
  54         return index;
  55 }
  56
  57 static void kvm_assigned_dev_interrupt_work_handler(struct work_struct *work)
  58 {
  59         struct kvm_assigned_dev_kernel *assigned_dev;
  60         struct kvm *kvm;
  61         int i;
  62
  63         assigned_dev = container_of(work, struct kvm_assigned_dev_kernel,
  64                                     interrupt_work);
  65         kvm = assigned_dev->kvm;
  66
  67         spin_lock_irq(&assigned_dev->assigned_dev_lock);
  68         if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
  69                 struct kvm_guest_msix_entry *guest_entries =
  70                         assigned_dev->guest_msix_entries;
  71                 for (i = 0; i < assigned_dev->entries_nr; i++) {
  72                         if (!(guest_entries[i].flags &
  73                                         KVM_ASSIGNED_MSIX_PENDING))
  74                                 continue;
  75                         guest_entries[i].flags &= ~KVM_ASSIGNED_MSIX_PENDING;
  76                         kvm_set_irq(assigned_dev->kvm,
  77                                     assigned_dev->irq_source_id,
  78                                     guest_entries[i].vector, 1);
  79                 }
  80         } else
  81                 kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
  82                             assigned_dev->guest_irq, 1);
  83
  84         spin_unlock_irq(&assigned_dev->assigned_dev_lock);
  85 }
  86
  87 static irqreturn_t kvm_assigned_dev_intr(int irq, void *dev_id)
  88 {
  89         unsigned long flags;
  90         struct kvm_assigned_dev_kernel *assigned_dev =
  91                 (struct kvm_assigned_dev_kernel *) dev_id;
  92
  93         spin_lock_irqsave(&assigned_dev->assigned_dev_lock, flags);
  94         if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
  95                 int index = find_index_from_host_irq(assigned_dev, irq);
  96                 if (index < 0)
  97                         goto out;
  98                 assigned_dev->guest_msix_entries[index].flags |=
  99                         KVM_ASSIGNED_MSIX_PENDING;
 100         }
 101
 102         schedule_work(&assigned_dev->interrupt_work);
 103
 104         if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_GUEST_INTX) {
 105                 disable_irq_nosync(irq);
 106                 assigned_dev->host_irq_disabled = true;
 107         }
 108
 109 out:
 110         spin_unlock_irqrestore(&assigned_dev->assigned_dev_lock, flags);
 111         return IRQ_HANDLED;
 112 }
 113
 114 /* Ack the irq line for an assigned device */
 115 static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
 116 {
 117         struct kvm_assigned_dev_kernel *dev;
 118         unsigned long flags;
 119
 120         if (kian->gsi == -1)
 121                 return;
 122
 123         dev = container_of(kian, struct kvm_assigned_dev_kernel,
 124                            ack_notifier);
 125
 126         kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0);
 127
 128         /* The guest irq may be shared so this ack may be
 129          * from another device.
 130          */
 131         spin_lock_irqsave(&dev->assigned_dev_lock, flags);
 132         if (dev->host_irq_disabled) {
 133                 enable_irq(dev->host_irq);
 134                 dev->host_irq_disabled = false;
 135         }
 136         spin_unlock_irqrestore(&dev->assigned_dev_lock, flags);
 137 }
 138
 139 static void deassign_guest_irq(struct kvm *kvm,
 140                                struct kvm_assigned_dev_kernel *assigned_dev)
 141 {
 142         kvm_unregister_irq_ack_notifier(kvm, &assigned_dev->ack_notifier);
 143         assigned_dev->ack_notifier.gsi = -1;
 144
 145         if (assigned_dev->irq_source_id != -1)
 146                 kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
 147         assigned_dev->irq_source_id = -1;
 148         assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_GUEST_MASK);
 149 }
 150
 151 /* The function implicit hold kvm->lock mutex due to cancel_work_sync() */
 152 static void deassign_host_irq(struct kvm *kvm,
 153                               struct kvm_assigned_dev_kernel *assigned_dev)
 154 {
 155         /*
 156          * In kvm_free_device_irq, cancel_work_sync return true if:
 157          * 1. work is scheduled, and then cancelled.
 158          * 2. work callback is executed.
 159          *
 160          * The first one ensured that the irq is disabled and no more events
 161          * would happen. But for the second one, the irq may be enabled (e.g.
 162          * for MSI). So we disable irq here to prevent further events.
 163          *
 164          * Notice this maybe result in nested disable if the interrupt type is
 165          * INTx, but it's OK for we are going to free it.
 166          *
 167          * If this function is a part of VM destroy, please ensure that till
 168          * now, the kvm state is still legal for probably we also have to wait
 169          * interrupt_work done.
 170          */
 171         if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
 172                 int i;
 173                 for (i = 0; i < assigned_dev->entries_nr; i++)
 174                         disable_irq_nosync(assigned_dev->
 175                                            host_msix_entries[i].vector);
 176
 177                 cancel_work_sync(&assigned_dev->interrupt_work);
 178
 179                 for (i = 0; i < assigned_dev->entries_nr; i++)
 180                         free_irq(assigned_dev->host_msix_entries[i].vector,
 181                                  (void *)assigned_dev);
 182
 183                 assigned_dev->entries_nr = 0;
 184                 kfree(assigned_dev->host_msix_entries);
 185                 kfree(assigned_dev->guest_msix_entries);
 186                 pci_disable_msix(assigned_dev->dev);
 187         } else {
 188                 /* Deal with MSI and INTx */
 189                 disable_irq_nosync(assigned_dev->host_irq);
 190                 cancel_work_sync(&assigned_dev->interrupt_work);
 191
 192                 free_irq(assigned_dev->host_irq, (void *)assigned_dev);
 193
 194                 if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSI)
 195                         pci_disable_msi(assigned_dev->dev);
 196         }
 197
 198         assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_HOST_MASK);
 199 }
 200
 201 static int kvm_deassign_irq(struct kvm *kvm,
 202                             struct kvm_assigned_dev_kernel *assigned_dev,
 203                             unsigned long irq_requested_type)
 204 {
 205         unsigned long guest_irq_type, host_irq_type;
 206
 207         if (!irqchip_in_kernel(kvm))
 208                 return -EINVAL;
 209         /* no irq assignment to deassign */
 210         if (!assigned_dev->irq_requested_type)
 211                 return -ENXIO;
 212
 213         host_irq_type = irq_requested_type & KVM_DEV_IRQ_HOST_MASK;
 214         guest_irq_type = irq_requested_type & KVM_DEV_IRQ_GUEST_MASK;
 215
 216         if (host_irq_type)
 217                 deassign_host_irq(kvm, assigned_dev);
 218         if (guest_irq_type)
 219                 deassign_guest_irq(kvm, assigned_dev);
 220
 221         return 0;
 222 }
 223
 224 static void kvm_free_assigned_irq(struct kvm *kvm,
 225                                   struct kvm_assigned_dev_kernel *assigned_dev)
 226 {
 227         kvm_deassign_irq(kvm, assigned_dev, assigned_dev->irq_requested_type);
 228 }
 229
 230 static void kvm_free_assigned_device(struct kvm *kvm,
 231                                      struct kvm_assigned_dev_kernel
 232                                      *assigned_dev)
 233 {
 234         kvm_free_assigned_irq(kvm, assigned_dev);
 235
 236         pci_reset_function(assigned_dev->dev);
 237
 238         pci_release_regions(assigned_dev->dev);
 239         pci_disable_device(assigned_dev->dev);
 240         pci_dev_put(assigned_dev->dev);
 241
 242         list_del(&assigned_dev->list);
 243         kfree(assigned_dev);
 244 }
 245
 246 void kvm_free_all_assigned_devices(struct kvm *kvm)
 247 {
 248         struct list_head *ptr, *ptr2;
 249         struct kvm_assigned_dev_kernel *assigned_dev;
 250
 251         list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
 252                 assigned_dev = list_entry(ptr,
 253                                           struct kvm_assigned_dev_kernel,
 254                                           list);
 255
 256                 kvm_free_assigned_device(kvm, assigned_dev);
 257         }
 258 }
 259
 260 static int assigned_device_enable_host_intx(struct kvm *kvm,
 261                                             struct kvm_assigned_dev_kernel *dev)
 262 {
 263         dev->host_irq = dev->dev->irq;
 264         /* Even though this is PCI, we don't want to use shared
 265          * interrupts. Sharing host devices with guest-assigned devices
 266          * on the same interrupt line is not a happy situation: there
 267          * are going to be long delays in accepting, acking, etc.
 268          */
 269         if (request_irq(dev->host_irq, kvm_assigned_dev_intr,
 270                         0, "kvm_assigned_intx_device", (void *)dev))
 271                 return -EIO;
 272         return 0;
 273 }
 274
 275 #ifdef __KVM_HAVE_MSI
 276 static int assigned_device_enable_host_msi(struct kvm *kvm,
 277                                            struct kvm_assigned_dev_kernel *dev)
 278 {
 279         int r;
 280
 281         if (!dev->dev->msi_enabled) {
 282                 r = pci_enable_msi(dev->dev);
 283                 if (r)
 284                         return r;
 285         }
 286
 287         dev->host_irq = dev->dev->irq;
 288         if (request_irq(dev->host_irq, kvm_assigned_dev_intr, 0,
 289                         "kvm_assigned_msi_device", (void *)dev)) {
 290                 pci_disable_msi(dev->dev);
 291                 return -EIO;
 292         }
 293
 294         return 0;
 295 }
 296 #endif
 297
 298 #ifdef __KVM_HAVE_MSIX
 299 static int assigned_device_enable_host_msix(struct kvm *kvm,
 300                                             struct kvm_assigned_dev_kernel *dev)
 301 {
 302         int i, r = -EINVAL;
 303
 304         /* host_msix_entries and guest_msix_entries should have been
 305          * initialized */
 306         if (dev->entries_nr == 0)
 307                 return r;
 308
 309         r = pci_enable_msix(dev->dev, dev->host_msix_entries, dev->entries_nr);
 310         if (r)
 311                 return r;
 312
 313         for (i = 0; i < dev->entries_nr; i++) {
 314                 r = request_irq(dev->host_msix_entries[i].vector,
 315                                 kvm_assigned_dev_intr, 0,
 316                                 "kvm_assigned_msix_device",
 317                                 (void *)dev);
 318                 /* FIXME: free requested_irq's on failure */
 319                 if (r)
 320                         return r;
 321         }
 322
 323         return 0;
 324 }
 325
 326 #endif
 327
 328 static int assigned_device_enable_guest_intx(struct kvm *kvm,
 329                                 struct kvm_assigned_dev_kernel *dev,
 330                                 struct kvm_assigned_irq *irq)
 331 {
 332         dev->guest_irq = irq->guest_irq;
 333         dev->ack_notifier.gsi = irq->guest_irq;
 334         return 0;
 335 }
 336
 337 #ifdef __KVM_HAVE_MSI
 338 static int assigned_device_enable_guest_msi(struct kvm *kvm,
 339                         struct kvm_assigned_dev_kernel *dev,
 340                         struct kvm_assigned_irq *irq)
 341 {
 342         dev->guest_irq = irq->guest_irq;
 343         dev->ack_notifier.gsi = -1;
 344         dev->host_irq_disabled = false;
 345         return 0;
 346 }
 347 #endif
 348
 349 #ifdef __KVM_HAVE_MSIX
 350 static int assigned_device_enable_guest_msix(struct kvm *kvm,
 351                         struct kvm_assigned_dev_kernel *dev,
 352                         struct kvm_assigned_irq *irq)
 353 {
 354         dev->guest_irq = irq->guest_irq;
 355         dev->ack_notifier.gsi = -1;
 356         dev->host_irq_disabled = false;
 357         return 0;
 358 }
 359 #endif
 360
 361 static int assign_host_irq(struct kvm *kvm,
 362                            struct kvm_assigned_dev_kernel *dev,
 363                            __u32 host_irq_type)
 364 {
 365         int r = -EEXIST;
 366
 367         if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_MASK)
 368                 return r;
 369
 370         switch (host_irq_type) {
 371         case KVM_DEV_IRQ_HOST_INTX:
 372                 r = assigned_device_enable_host_intx(kvm, dev);
 373                 break;
 374 #ifdef __KVM_HAVE_MSI
 375         case KVM_DEV_IRQ_HOST_MSI:
 376                 r = assigned_device_enable_host_msi(kvm, dev);
 377                 break;
 378 #endif
 379 #ifdef __KVM_HAVE_MSIX
 380         case KVM_DEV_IRQ_HOST_MSIX:
 381                 r = assigned_device_enable_host_msix(kvm, dev);
 382                 break;
 383 #endif
 384         default:
 385                 r = -EINVAL;
 386         }
 387
 388         if (!r)
 389                 dev->irq_requested_type |= host_irq_type;
 390
 391         return r;
 392 }
 393
 394 static int assign_guest_irq(struct kvm *kvm,
 395                             struct kvm_assigned_dev_kernel *dev,
 396                             struct kvm_assigned_irq *irq,
 397                             unsigned long guest_irq_type)
 398 {
 399         int id;
 400         int r = -EEXIST;
 401
 402         if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK)
 403                 return r;
 404
 405         id = kvm_request_irq_source_id(kvm);
 406         if (id < 0)
 407                 return id;
 408
 409         dev->irq_source_id = id;
 410
 411         switch (guest_irq_type) {
 412         case KVM_DEV_IRQ_GUEST_INTX:
 413                 r = assigned_device_enable_guest_intx(kvm, dev, irq);
 414                 break;
 415 #ifdef __KVM_HAVE_MSI
 416         case KVM_DEV_IRQ_GUEST_MSI:
 417                 r = assigned_device_enable_guest_msi(kvm, dev, irq);
 418                 break;
 419 #endif
 420 #ifdef __KVM_HAVE_MSIX
 421         case KVM_DEV_IRQ_GUEST_MSIX:
 422                 r = assigned_device_enable_guest_msix(kvm, dev, irq);
 423                 break;
 424 #endif
 425         default:
 426                 r = -EINVAL;
 427         }
 428
 429         if (!r) {
 430                 dev->irq_requested_type |= guest_irq_type;
 431                 kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier);
 432         } else
 433                 kvm_free_irq_source_id(kvm, dev->irq_source_id);
 434
 435         return r;
 436 }
 437
 438 /* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
 439 static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
 440                                    struct kvm_assigned_irq *assigned_irq)
 441 {
 442         int r = -EINVAL;
 443         struct kvm_assigned_dev_kernel *match;
 444         unsigned long host_irq_type, guest_irq_type;
 445
 446         if (!capable(CAP_SYS_RAWIO))
 447                 return -EPERM;
 448
 449         if (!irqchip_in_kernel(kvm))
 450                 return r;
 451
 452         mutex_lock(&kvm->lock);
 453         r = -ENODEV;
 454         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 455                                       assigned_irq->assigned_dev_id);
 456         if (!match)
 457                 goto out;
 458
 459         host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK);
 460         guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK);
 461
 462         r = -EINVAL;
 463         /* can only assign one type at a time */
 464         if (hweight_long(host_irq_type) > 1)
 465                 goto out;
 466         if (hweight_long(guest_irq_type) > 1)
 467                 goto out;
 468         if (host_irq_type == 0 && guest_irq_type == 0)
 469                 goto out;
 470
 471         r = 0;
 472         if (host_irq_type)
 473                 r = assign_host_irq(kvm, match, host_irq_type);
 474         if (r)
 475                 goto out;
 476
 477         if (guest_irq_type)
 478                 r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type);
 479 out:
 480         mutex_unlock(&kvm->lock);
 481         return r;
 482 }
 483
 484 static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
 485                                          struct kvm_assigned_irq
 486                                          *assigned_irq)
 487 {
 488         int r = -ENODEV;
 489         struct kvm_assigned_dev_kernel *match;
 490
 491         mutex_lock(&kvm->lock);
 492
 493         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 494                                       assigned_irq->assigned_dev_id);
 495         if (!match)
 496                 goto out;
 497
 498         r = kvm_deassign_irq(kvm, match, assigned_irq->flags);
 499 out:
 500         mutex_unlock(&kvm->lock);
 501         return r;
 502 }
 503
 504 static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
 505                                       struct kvm_assigned_pci_dev *assigned_dev)
 506 {
 507         int r = 0;
 508         struct kvm_assigned_dev_kernel *match;
 509         struct pci_dev *dev;
 510
 511         down_read(&kvm->slots_lock);
 512         mutex_lock(&kvm->lock);
 513
 514         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 515                                       assigned_dev->assigned_dev_id);
 516         if (match) {
 517                 /* device already assigned */
 518                 r = -EEXIST;
 519                 goto out;
 520         }
 521
 522         match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
 523         if (match == NULL) {
 524                 printk(KERN_INFO "%s: Couldn't allocate memory\n",
 525                        __func__);
 526                 r = -ENOMEM;
 527                 goto out;
 528         }
 529         dev = pci_get_bus_and_slot(assigned_dev->busnr,
 530                                    assigned_dev->devfn);
 531         if (!dev) {
 532                 printk(KERN_INFO "%s: host device not found\n", __func__);
 533                 r = -EINVAL;
 534                 goto out_free;
 535         }
 536         if (pci_enable_device(dev)) {
 537                 printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
 538                 r = -EBUSY;
 539                 goto out_put;
 540         }
 541         r = pci_request_regions(dev, "kvm_assigned_device");
 542         if (r) {
 543                 printk(KERN_INFO "%s: Could not get access to device regions\n",
 544                        __func__);
 545                 goto out_disable;
 546         }
 547
 548         pci_reset_function(dev);
 549
 550         match->assigned_dev_id = assigned_dev->assigned_dev_id;
 551         match->host_busnr = assigned_dev->busnr;
 552         match->host_devfn = assigned_dev->devfn;
 553         match->flags = assigned_dev->flags;
 554         match->dev = dev;
 555         spin_lock_init(&match->assigned_dev_lock);
 556         match->irq_source_id = -1;
 557         match->kvm = kvm;
 558         match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
 559         INIT_WORK(&match->interrupt_work,
 560                   kvm_assigned_dev_interrupt_work_handler);
 561
 562         list_add(&match->list, &kvm->arch.assigned_dev_head);
 563
 564         if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
 565                 if (!kvm->arch.iommu_domain) {
 566                         r = kvm_iommu_map_guest(kvm);
 567                         if (r)
 568                                 goto out_list_del;
 569                 }
 570                 r = kvm_assign_device(kvm, match);
 571                 if (r)
 572                         goto out_list_del;
 573         }
 574
 575 out:
 576         mutex_unlock(&kvm->lock);
 577         up_read(&kvm->slots_lock);
 578         return r;
 579 out_list_del:
 580         list_del(&match->list);
 581         pci_release_regions(dev);
 582 out_disable:
 583         pci_disable_device(dev);
 584 out_put:
 585         pci_dev_put(dev);
 586 out_free:
 587         kfree(match);
 588         mutex_unlock(&kvm->lock);
 589         up_read(&kvm->slots_lock);
 590         return r;
 591 }
 592
 593 static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
 594                 struct kvm_assigned_pci_dev *assigned_dev)
 595 {
 596         int r = 0;
 597         struct kvm_assigned_dev_kernel *match;
 598
 599         mutex_lock(&kvm->lock);
 600
 601         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 602                                       assigned_dev->assigned_dev_id);
 603         if (!match) {
 604                 printk(KERN_INFO "%s: device hasn't been assigned before, "
 605                   "so cannot be deassigned\n", __func__);
 606                 r = -EINVAL;
 607                 goto out;
 608         }
 609
 610         if (match->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU)
 611                 kvm_deassign_device(kvm, match);
 612
 613         kvm_free_assigned_device(kvm, match);
 614
 615 out:
 616         mutex_unlock(&kvm->lock);
 617         return r;
 618 }
 619
 620
 621 #ifdef __KVM_HAVE_MSIX
 622 static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
 623                                     struct kvm_assigned_msix_nr *entry_nr)
 624 {
 625         int r = 0;
 626         struct kvm_assigned_dev_kernel *adev;
 627
 628         mutex_lock(&kvm->lock);
 629
 630         adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 631                                       entry_nr->assigned_dev_id);
 632         if (!adev) {
 633                 r = -EINVAL;
 634                 goto msix_nr_out;
 635         }
 636
 637         if (adev->entries_nr == 0) {
 638                 adev->entries_nr = entry_nr->entry_nr;
 639                 if (adev->entries_nr == 0 ||
 640                     adev->entries_nr >= KVM_MAX_MSIX_PER_DEV) {
 641                         r = -EINVAL;
 642                         goto msix_nr_out;
 643                 }
 644
 645                 adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) *
 646                                                 entry_nr->entry_nr,
 647                                                 GFP_KERNEL);
 648                 if (!adev->host_msix_entries) {
 649                         r = -ENOMEM;
 650                         goto msix_nr_out;
 651                 }
 652                 adev->guest_msix_entries = kzalloc(
 653                                 sizeof(struct kvm_guest_msix_entry) *
 654                                 entry_nr->entry_nr, GFP_KERNEL);
 655                 if (!adev->guest_msix_entries) {
 656                         kfree(adev->host_msix_entries);
 657                         r = -ENOMEM;
 658                         goto msix_nr_out;
 659                 }
 660         } else /* Not allowed set MSI-X number twice */
 661                 r = -EINVAL;
 662 msix_nr_out:
 663         mutex_unlock(&kvm->lock);
 664         return r;
 665 }
 666
 667 static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm,
 668                                        struct kvm_assigned_msix_entry *entry)
 669 {
 670         int r = 0, i;
 671         struct kvm_assigned_dev_kernel *adev;
 672
 673         mutex_lock(&kvm->lock);
 674
 675         adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 676                                       entry->assigned_dev_id);
 677
 678         if (!adev) {
 679                 r = -EINVAL;
 680                 goto msix_entry_out;
 681         }
 682
 683         for (i = 0; i < adev->entries_nr; i++)
 684                 if (adev->guest_msix_entries[i].vector == 0 ||
 685                     adev->guest_msix_entries[i].entry == entry->entry) {
 686                         adev->guest_msix_entries[i].entry = entry->entry;
 687                         adev->guest_msix_entries[i].vector = entry->gsi;
 688                         adev->host_msix_entries[i].entry = entry->entry;
 689                         break;
 690                 }
 691         if (i == adev->entries_nr) {
 692                 r = -ENOSPC;
 693                 goto msix_entry_out;
 694         }
 695
 696 msix_entry_out:
 697         mutex_unlock(&kvm->lock);
 698
 699         return r;
 700 }
 701 #endif
 702
 703 long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 704                                   unsigned long arg)
 705 {
 706         void __user *argp = (void __user *)arg;
 707         int r = -ENOTTY;
 708
 709         switch (ioctl) {
 710         case KVM_ASSIGN_PCI_DEVICE: {
 711                 struct kvm_assigned_pci_dev assigned_dev;
 712
 713                 r = -EFAULT;
 714                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
 715                         goto out;
 716                 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
 717                 if (r)
 718                         goto out;
 719                 break;
 720         }
 721         case KVM_ASSIGN_IRQ: {
 722                 r = -EOPNOTSUPP;
 723                 break;
 724         }
 725 #ifdef KVM_CAP_ASSIGN_DEV_IRQ
 726         case KVM_ASSIGN_DEV_IRQ: {
 727                 struct kvm_assigned_irq assigned_irq;
 728
 729                 r = -EFAULT;
 730                 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
 731                         goto out;
 732                 r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
 733                 if (r)
 734                         goto out;
 735                 break;
 736         }
 737         case KVM_DEASSIGN_DEV_IRQ: {
 738                 struct kvm_assigned_irq assigned_irq;
 739
 740                 r = -EFAULT;
 741                 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
 742                         goto out;
 743                 r = kvm_vm_ioctl_deassign_dev_irq(kvm, &assigned_irq);
 744                 if (r)
 745                         goto out;
 746                 break;
 747         }
 748 #endif
 749 #ifdef KVM_CAP_DEVICE_DEASSIGNMENT
 750         case KVM_DEASSIGN_PCI_DEVICE: {
 751                 struct kvm_assigned_pci_dev assigned_dev;
 752
 753                 r = -EFAULT;
 754                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
 755                         goto out;
 756                 r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
 757                 if (r)
 758                         goto out;
 759                 break;
 760         }
 761 #endif
 762 #ifdef KVM_CAP_IRQ_ROUTING
 763         case KVM_SET_GSI_ROUTING: {
 764                 struct kvm_irq_routing routing;
 765                 struct kvm_irq_routing __user *urouting;
 766                 struct kvm_irq_routing_entry *entries;
 767
 768                 r = -EFAULT;
 769                 if (copy_from_user(&routing, argp, sizeof(routing)))
 770                         goto out;
 771                 r = -EINVAL;
 772                 if (routing.nr >= KVM_MAX_IRQ_ROUTES)
 773                         goto out;
 774                 if (routing.flags)
 775                         goto out;
 776                 r = -ENOMEM;
 777                 entries = vmalloc(routing.nr * sizeof(*entries));
 778                 if (!entries)
 779                         goto out;
 780                 r = -EFAULT;
 781                 urouting = argp;
 782                 if (copy_from_user(entries, urouting->entries,
 783                                    routing.nr * sizeof(*entries)))
 784                         goto out_free_irq_routing;
 785                 r = kvm_set_irq_routing(kvm, entries, routing.nr,
 786                                         routing.flags);
 787         out_free_irq_routing:
 788                 vfree(entries);
 789                 break;
 790         }
 791 #endif /* KVM_CAP_IRQ_ROUTING */
 792 #ifdef __KVM_HAVE_MSIX
 793         case KVM_ASSIGN_SET_MSIX_NR: {
 794                 struct kvm_assigned_msix_nr entry_nr;
 795                 r = -EFAULT;
 796                 if (copy_from_user(&entry_nr, argp, sizeof entry_nr))
 797                         goto out;
 798                 r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr);
 799                 if (r)
 800                         goto out;
 801                 break;
 802         }
 803         case KVM_ASSIGN_SET_MSIX_ENTRY: {
 804                 struct kvm_assigned_msix_entry entry;
 805                 r = -EFAULT;
 806                 if (copy_from_user(&entry, argp, sizeof entry))
 807                         goto out;
 808                 r = kvm_vm_ioctl_set_msix_entry(kvm, &entry);
 809                 if (r)
 810                         goto out;
 811                 break;
 812         }
 813 #endif
 814         }
 815 out:
 816         return r;
 817 }
 818