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         pci_restore_state(assigned_dev->dev);
 202
 203         pci_release_regions(assigned_dev->dev);
 204         pci_disable_device(assigned_dev->dev);
 205         pci_dev_put(assigned_dev->dev);
 206
 207         list_del(&assigned_dev->list);
 208         kfree(assigned_dev);
 209 }
 210
 211 void kvm_free_all_assigned_devices(struct kvm *kvm)
 212 {
 213         struct list_head *ptr, *ptr2;
 214         struct kvm_assigned_dev_kernel *assigned_dev;
 215
 216         list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
 217                 assigned_dev = list_entry(ptr,
 218                                           struct kvm_assigned_dev_kernel,
 219                                           list);
 220
 221                 kvm_free_assigned_device(kvm, assigned_dev);
 222         }
 223 }
 224
 225 static int assigned_device_enable_host_intx(struct kvm *kvm,
 226                                             struct kvm_assigned_dev_kernel *dev)
 227 {
 228         dev->host_irq = dev->dev->irq;
 229         /* Even though this is PCI, we don't want to use shared
 230          * interrupts. Sharing host devices with guest-assigned devices
 231          * on the same interrupt line is not a happy situation: there
 232          * are going to be long delays in accepting, acking, etc.
 233          */
 234         if (request_threaded_irq(dev->host_irq, NULL, kvm_assigned_dev_thread,
 235                                  IRQF_ONESHOT, dev->irq_name, (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, dev->irq_name, (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, dev->irq_name, (void *)dev);
 282                 if (r)
 283                         goto err;
 284         }
 285
 286         return 0;
 287 err:
 288         for (i -= 1; i >= 0; i--)
 289                 free_irq(dev->host_msix_entries[i].vector, (void *)dev);
 290         pci_disable_msix(dev->dev);
 291         return r;
 292 }
 293
 294 #endif
 295
 296 static int assigned_device_enable_guest_intx(struct kvm *kvm,
 297                                 struct kvm_assigned_dev_kernel *dev,
 298                                 struct kvm_assigned_irq *irq)
 299 {
 300         dev->guest_irq = irq->guest_irq;
 301         dev->ack_notifier.gsi = irq->guest_irq;
 302         return 0;
 303 }
 304
 305 #ifdef __KVM_HAVE_MSI
 306 static int assigned_device_enable_guest_msi(struct kvm *kvm,
 307                         struct kvm_assigned_dev_kernel *dev,
 308                         struct kvm_assigned_irq *irq)
 309 {
 310         dev->guest_irq = irq->guest_irq;
 311         dev->ack_notifier.gsi = -1;
 312         dev->host_irq_disabled = false;
 313         return 0;
 314 }
 315 #endif
 316
 317 #ifdef __KVM_HAVE_MSIX
 318 static int assigned_device_enable_guest_msix(struct kvm *kvm,
 319                         struct kvm_assigned_dev_kernel *dev,
 320                         struct kvm_assigned_irq *irq)
 321 {
 322         dev->guest_irq = irq->guest_irq;
 323         dev->ack_notifier.gsi = -1;
 324         dev->host_irq_disabled = false;
 325         return 0;
 326 }
 327 #endif
 328
 329 static int assign_host_irq(struct kvm *kvm,
 330                            struct kvm_assigned_dev_kernel *dev,
 331                            __u32 host_irq_type)
 332 {
 333         int r = -EEXIST;
 334
 335         if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_MASK)
 336                 return r;
 337
 338         snprintf(dev->irq_name, sizeof(dev->irq_name), "kvm:%s",
 339                  pci_name(dev->dev));
 340
 341         switch (host_irq_type) {
 342         case KVM_DEV_IRQ_HOST_INTX:
 343                 r = assigned_device_enable_host_intx(kvm, dev);
 344                 break;
 345 #ifdef __KVM_HAVE_MSI
 346         case KVM_DEV_IRQ_HOST_MSI:
 347                 r = assigned_device_enable_host_msi(kvm, dev);
 348                 break;
 349 #endif
 350 #ifdef __KVM_HAVE_MSIX
 351         case KVM_DEV_IRQ_HOST_MSIX:
 352                 r = assigned_device_enable_host_msix(kvm, dev);
 353                 break;
 354 #endif
 355         default:
 356                 r = -EINVAL;
 357         }
 358
 359         if (!r)
 360                 dev->irq_requested_type |= host_irq_type;
 361
 362         return r;
 363 }
 364
 365 static int assign_guest_irq(struct kvm *kvm,
 366                             struct kvm_assigned_dev_kernel *dev,
 367                             struct kvm_assigned_irq *irq,
 368                             unsigned long guest_irq_type)
 369 {
 370         int id;
 371         int r = -EEXIST;
 372
 373         if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK)
 374                 return r;
 375
 376         id = kvm_request_irq_source_id(kvm);
 377         if (id < 0)
 378                 return id;
 379
 380         dev->irq_source_id = id;
 381
 382         switch (guest_irq_type) {
 383         case KVM_DEV_IRQ_GUEST_INTX:
 384                 r = assigned_device_enable_guest_intx(kvm, dev, irq);
 385                 break;
 386 #ifdef __KVM_HAVE_MSI
 387         case KVM_DEV_IRQ_GUEST_MSI:
 388                 r = assigned_device_enable_guest_msi(kvm, dev, irq);
 389                 break;
 390 #endif
 391 #ifdef __KVM_HAVE_MSIX
 392         case KVM_DEV_IRQ_GUEST_MSIX:
 393                 r = assigned_device_enable_guest_msix(kvm, dev, irq);
 394                 break;
 395 #endif
 396         default:
 397                 r = -EINVAL;
 398         }
 399
 400         if (!r) {
 401                 dev->irq_requested_type |= guest_irq_type;
 402                 kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier);
 403         } else
 404                 kvm_free_irq_source_id(kvm, dev->irq_source_id);
 405
 406         return r;
 407 }
 408
 409 /* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
 410 static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
 411                                    struct kvm_assigned_irq *assigned_irq)
 412 {
 413         int r = -EINVAL;
 414         struct kvm_assigned_dev_kernel *match;
 415         unsigned long host_irq_type, guest_irq_type;
 416
 417         if (!irqchip_in_kernel(kvm))
 418                 return r;
 419
 420         mutex_lock(&kvm->lock);
 421         r = -ENODEV;
 422         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 423                                       assigned_irq->assigned_dev_id);
 424         if (!match)
 425                 goto out;
 426
 427         host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK);
 428         guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK);
 429
 430         r = -EINVAL;
 431         /* can only assign one type at a time */
 432         if (hweight_long(host_irq_type) > 1)
 433                 goto out;
 434         if (hweight_long(guest_irq_type) > 1)
 435                 goto out;
 436         if (host_irq_type == 0 && guest_irq_type == 0)
 437                 goto out;
 438
 439         r = 0;
 440         if (host_irq_type)
 441                 r = assign_host_irq(kvm, match, host_irq_type);
 442         if (r)
 443                 goto out;
 444
 445         if (guest_irq_type)
 446                 r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type);
 447 out:
 448         mutex_unlock(&kvm->lock);
 449         return r;
 450 }
 451
 452 static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
 453                                          struct kvm_assigned_irq
 454                                          *assigned_irq)
 455 {
 456         int r = -ENODEV;
 457         struct kvm_assigned_dev_kernel *match;
 458
 459         mutex_lock(&kvm->lock);
 460
 461         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 462                                       assigned_irq->assigned_dev_id);
 463         if (!match)
 464                 goto out;
 465
 466         r = kvm_deassign_irq(kvm, match, assigned_irq->flags);
 467 out:
 468         mutex_unlock(&kvm->lock);
 469         return r;
 470 }
 471
 472 static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
 473                                       struct kvm_assigned_pci_dev *assigned_dev)
 474 {
 475         int r = 0, idx;
 476         struct kvm_assigned_dev_kernel *match;
 477         struct pci_dev *dev;
 478
 479         mutex_lock(&kvm->lock);
 480         idx = srcu_read_lock(&kvm->srcu);
 481
 482         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 483                                       assigned_dev->assigned_dev_id);
 484         if (match) {
 485                 /* device already assigned */
 486                 r = -EEXIST;
 487                 goto out;
 488         }
 489
 490         match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
 491         if (match == NULL) {
 492                 printk(KERN_INFO "%s: Couldn't allocate memory\n",
 493                        __func__);
 494                 r = -ENOMEM;
 495                 goto out;
 496         }
 497         dev = pci_get_domain_bus_and_slot(assigned_dev->segnr,
 498                                    assigned_dev->busnr,
 499                                    assigned_dev->devfn);
 500         if (!dev) {
 501                 printk(KERN_INFO "%s: host device not found\n", __func__);
 502                 r = -EINVAL;
 503                 goto out_free;
 504         }
 505         if (pci_enable_device(dev)) {
 506                 printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
 507                 r = -EBUSY;
 508                 goto out_put;
 509         }
 510         r = pci_request_regions(dev, "kvm_assigned_device");
 511         if (r) {
 512                 printk(KERN_INFO "%s: Could not get access to device regions\n",
 513                        __func__);
 514                 goto out_disable;
 515         }
 516
 517         pci_reset_function(dev);
 518         pci_save_state(dev);
 519
 520         match->assigned_dev_id = assigned_dev->assigned_dev_id;
 521         match->host_segnr = assigned_dev->segnr;
 522         match->host_busnr = assigned_dev->busnr;
 523         match->host_devfn = assigned_dev->devfn;
 524         match->flags = assigned_dev->flags;
 525         match->dev = dev;
 526         spin_lock_init(&match->intx_lock);
 527         match->irq_source_id = -1;
 528         match->kvm = kvm;
 529         match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
 530
 531         list_add(&match->list, &kvm->arch.assigned_dev_head);
 532
 533         if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
 534                 if (!kvm->arch.iommu_domain) {
 535                         r = kvm_iommu_map_guest(kvm);
 536                         if (r)
 537                                 goto out_list_del;
 538                 }
 539                 r = kvm_assign_device(kvm, match);
 540                 if (r)
 541                         goto out_list_del;
 542         }
 543
 544 out:
 545         srcu_read_unlock(&kvm->srcu, idx);
 546         mutex_unlock(&kvm->lock);
 547         return r;
 548 out_list_del:
 549         pci_restore_state(dev);
 550         list_del(&match->list);
 551         pci_release_regions(dev);
 552 out_disable:
 553         pci_disable_device(dev);
 554 out_put:
 555         pci_dev_put(dev);
 556 out_free:
 557         kfree(match);
 558         srcu_read_unlock(&kvm->srcu, idx);
 559         mutex_unlock(&kvm->lock);
 560         return r;
 561 }
 562
 563 static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
 564                 struct kvm_assigned_pci_dev *assigned_dev)
 565 {
 566         int r = 0;
 567         struct kvm_assigned_dev_kernel *match;
 568
 569         mutex_lock(&kvm->lock);
 570
 571         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 572                                       assigned_dev->assigned_dev_id);
 573         if (!match) {
 574                 printk(KERN_INFO "%s: device hasn't been assigned before, "
 575                   "so cannot be deassigned\n", __func__);
 576                 r = -EINVAL;
 577                 goto out;
 578         }
 579
 580         if (match->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU)
 581                 kvm_deassign_device(kvm, match);
 582
 583         kvm_free_assigned_device(kvm, match);
 584
 585 out:
 586         mutex_unlock(&kvm->lock);
 587         return r;
 588 }
 589
 590
 591 #ifdef __KVM_HAVE_MSIX
 592 static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
 593                                     struct kvm_assigned_msix_nr *entry_nr)
 594 {
 595         int r = 0;
 596         struct kvm_assigned_dev_kernel *adev;
 597
 598         mutex_lock(&kvm->lock);
 599
 600         adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 601                                       entry_nr->assigned_dev_id);
 602         if (!adev) {
 603                 r = -EINVAL;
 604                 goto msix_nr_out;
 605         }
 606
 607         if (adev->entries_nr == 0) {
 608                 adev->entries_nr = entry_nr->entry_nr;
 609                 if (adev->entries_nr == 0 ||
 610                     adev->entries_nr >= KVM_MAX_MSIX_PER_DEV) {
 611                         r = -EINVAL;
 612                         goto msix_nr_out;
 613                 }
 614
 615                 adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) *
 616                                                 entry_nr->entry_nr,
 617                                                 GFP_KERNEL);
 618                 if (!adev->host_msix_entries) {
 619                         r = -ENOMEM;
 620                         goto msix_nr_out;
 621                 }
 622                 adev->guest_msix_entries =
 623                         kzalloc(sizeof(struct msix_entry) * entry_nr->entry_nr,
 624                                 GFP_KERNEL);
 625                 if (!adev->guest_msix_entries) {
 626                         kfree(adev->host_msix_entries);
 627                         r = -ENOMEM;
 628                         goto msix_nr_out;
 629                 }
 630         } else /* Not allowed set MSI-X number twice */
 631                 r = -EINVAL;
 632 msix_nr_out:
 633         mutex_unlock(&kvm->lock);
 634         return r;
 635 }
 636
 637 static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm,
 638                                        struct kvm_assigned_msix_entry *entry)
 639 {
 640         int r = 0, i;
 641         struct kvm_assigned_dev_kernel *adev;
 642
 643         mutex_lock(&kvm->lock);
 644
 645         adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 646                                       entry->assigned_dev_id);
 647
 648         if (!adev) {
 649                 r = -EINVAL;
 650                 goto msix_entry_out;
 651         }
 652
 653         for (i = 0; i < adev->entries_nr; i++)
 654                 if (adev->guest_msix_entries[i].vector == 0 ||
 655                     adev->guest_msix_entries[i].entry == entry->entry) {
 656                         adev->guest_msix_entries[i].entry = entry->entry;
 657                         adev->guest_msix_entries[i].vector = entry->gsi;
 658                         adev->host_msix_entries[i].entry = entry->entry;
 659                         break;
 660                 }
 661         if (i == adev->entries_nr) {
 662                 r = -ENOSPC;
 663                 goto msix_entry_out;
 664         }
 665
 666 msix_entry_out:
 667         mutex_unlock(&kvm->lock);
 668
 669         return r;
 670 }
 671 #endif
 672
 673 long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 674                                   unsigned long arg)
 675 {
 676         void __user *argp = (void __user *)arg;
 677         int r;
 678
 679         switch (ioctl) {
 680         case KVM_ASSIGN_PCI_DEVICE: {
 681                 struct kvm_assigned_pci_dev assigned_dev;
 682
 683                 r = -EFAULT;
 684                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
 685                         goto out;
 686                 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
 687                 if (r)
 688                         goto out;
 689                 break;
 690         }
 691         case KVM_ASSIGN_IRQ: {
 692                 r = -EOPNOTSUPP;
 693                 break;
 694         }
 695         case KVM_ASSIGN_DEV_IRQ: {
 696                 struct kvm_assigned_irq assigned_irq;
 697
 698                 r = -EFAULT;
 699                 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
 700                         goto out;
 701                 r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
 702                 if (r)
 703                         goto out;
 704                 break;
 705         }
 706         case KVM_DEASSIGN_DEV_IRQ: {
 707                 struct kvm_assigned_irq assigned_irq;
 708
 709                 r = -EFAULT;
 710                 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
 711                         goto out;
 712                 r = kvm_vm_ioctl_deassign_dev_irq(kvm, &assigned_irq);
 713                 if (r)
 714                         goto out;
 715                 break;
 716         }
 717         case KVM_DEASSIGN_PCI_DEVICE: {
 718                 struct kvm_assigned_pci_dev assigned_dev;
 719
 720                 r = -EFAULT;
 721                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
 722                         goto out;
 723                 r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
 724                 if (r)
 725                         goto out;
 726                 break;
 727         }
 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         default:
 781                 r = -ENOTTY;
 782                 break;
 783         }
 784 out:
 785         return r;
 786 }
 787