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
  62         if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_INTX) {
  63                 spin_lock(&assigned_dev->intx_lock);
  64                 disable_irq_nosync(irq);
  65                 assigned_dev->host_irq_disabled = true;
  66                 spin_unlock(&assigned_dev->intx_lock);
  67         }
  68
  69         kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
  70                     assigned_dev->guest_irq, 1);
  71
  72         return IRQ_HANDLED;
  73 }
  74
  75 #ifdef __KVM_HAVE_MSIX
  76 static irqreturn_t kvm_assigned_dev_thread_msix(int irq, void *dev_id)
  77 {
  78         struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
  79         int index = find_index_from_host_irq(assigned_dev, irq);
  80         u32 vector;
  81
  82         if (index >= 0) {
  83                 vector = assigned_dev->guest_msix_entries[index].vector;
  84                 kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
  85                             vector, 1);
  86         }
  87
  88         return IRQ_HANDLED;
  89 }
  90 #endif
  91
  92 /* Ack the irq line for an assigned device */
  93 static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
  94 {
  95         struct kvm_assigned_dev_kernel *dev =
  96                 container_of(kian, struct kvm_assigned_dev_kernel,
  97                              ack_notifier);
  98
  99         kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0);
 100
 101         /* The guest irq may be shared so this ack may be
 102          * from another device.
 103          */
 104         spin_lock(&dev->intx_lock);
 105         if (dev->host_irq_disabled) {
 106                 enable_irq(dev->host_irq);
 107                 dev->host_irq_disabled = false;
 108         }
 109         spin_unlock(&dev->intx_lock);
 110 }
 111
 112 static void deassign_guest_irq(struct kvm *kvm,
 113                                struct kvm_assigned_dev_kernel *assigned_dev)
 114 {
 115         if (assigned_dev->ack_notifier.gsi != -1)
 116                 kvm_unregister_irq_ack_notifier(kvm,
 117                                                 &assigned_dev->ack_notifier);
 118
 119         kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
 120                     assigned_dev->guest_irq, 0);
 121
 122         if (assigned_dev->irq_source_id != -1)
 123                 kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
 124         assigned_dev->irq_source_id = -1;
 125         assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_GUEST_MASK);
 126 }
 127
 128 /* The function implicit hold kvm->lock mutex due to cancel_work_sync() */
 129 static void deassign_host_irq(struct kvm *kvm,
 130                               struct kvm_assigned_dev_kernel *assigned_dev)
 131 {
 132         /*
 133          * We disable irq here to prevent further events.
 134          *
 135          * Notice this maybe result in nested disable if the interrupt type is
 136          * INTx, but it's OK for we are going to free it.
 137          *
 138          * If this function is a part of VM destroy, please ensure that till
 139          * now, the kvm state is still legal for probably we also have to wait
 140          * on a currently running IRQ handler.
 141          */
 142         if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
 143                 int i;
 144                 for (i = 0; i < assigned_dev->entries_nr; i++)
 145                         disable_irq(assigned_dev->host_msix_entries[i].vector);
 146
 147                 for (i = 0; i < assigned_dev->entries_nr; i++)
 148                         free_irq(assigned_dev->host_msix_entries[i].vector,
 149                                  assigned_dev);
 150
 151                 assigned_dev->entries_nr = 0;
 152                 kfree(assigned_dev->host_msix_entries);
 153                 kfree(assigned_dev->guest_msix_entries);
 154                 pci_disable_msix(assigned_dev->dev);
 155         } else {
 156                 /* Deal with MSI and INTx */
 157                 disable_irq(assigned_dev->host_irq);
 158
 159                 free_irq(assigned_dev->host_irq, assigned_dev);
 160
 161                 if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSI)
 162                         pci_disable_msi(assigned_dev->dev);
 163         }
 164
 165         assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_HOST_MASK);
 166 }
 167
 168 static int kvm_deassign_irq(struct kvm *kvm,
 169                             struct kvm_assigned_dev_kernel *assigned_dev,
 170                             unsigned long irq_requested_type)
 171 {
 172         unsigned long guest_irq_type, host_irq_type;
 173
 174         if (!irqchip_in_kernel(kvm))
 175                 return -EINVAL;
 176         /* no irq assignment to deassign */
 177         if (!assigned_dev->irq_requested_type)
 178                 return -ENXIO;
 179
 180         host_irq_type = irq_requested_type & KVM_DEV_IRQ_HOST_MASK;
 181         guest_irq_type = irq_requested_type & KVM_DEV_IRQ_GUEST_MASK;
 182
 183         if (host_irq_type)
 184                 deassign_host_irq(kvm, assigned_dev);
 185         if (guest_irq_type)
 186                 deassign_guest_irq(kvm, assigned_dev);
 187
 188         return 0;
 189 }
 190
 191 static void kvm_free_assigned_irq(struct kvm *kvm,
 192                                   struct kvm_assigned_dev_kernel *assigned_dev)
 193 {
 194         kvm_deassign_irq(kvm, assigned_dev, assigned_dev->irq_requested_type);
 195 }
 196
 197 static void kvm_free_assigned_device(struct kvm *kvm,
 198                                      struct kvm_assigned_dev_kernel
 199                                      *assigned_dev)
 200 {
 201         kvm_free_assigned_irq(kvm, assigned_dev);
 202
 203         pci_reset_function(assigned_dev->dev);
 204         if (pci_load_and_free_saved_state(assigned_dev->dev,
 205                                           &assigned_dev->pci_saved_state))
 206                 printk(KERN_INFO "%s: Couldn't reload %s saved state\n",
 207                        __func__, dev_name(&assigned_dev->dev->dev));
 208         else
 209                 pci_restore_state(assigned_dev->dev);
 210
 211         assigned_dev->dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
 212
 213         pci_release_regions(assigned_dev->dev);
 214         pci_disable_device(assigned_dev->dev);
 215         pci_dev_put(assigned_dev->dev);
 216
 217         list_del(&assigned_dev->list);
 218         kfree(assigned_dev);
 219 }
 220
 221 void kvm_free_all_assigned_devices(struct kvm *kvm)
 222 {
 223         struct list_head *ptr, *ptr2;
 224         struct kvm_assigned_dev_kernel *assigned_dev;
 225
 226         list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
 227                 assigned_dev = list_entry(ptr,
 228                                           struct kvm_assigned_dev_kernel,
 229                                           list);
 230
 231                 kvm_free_assigned_device(kvm, assigned_dev);
 232         }
 233 }
 234
 235 static int assigned_device_enable_host_intx(struct kvm *kvm,
 236                                             struct kvm_assigned_dev_kernel *dev)
 237 {
 238         dev->host_irq = dev->dev->irq;
 239         /* Even though this is PCI, we don't want to use shared
 240          * interrupts. Sharing host devices with guest-assigned devices
 241          * on the same interrupt line is not a happy situation: there
 242          * are going to be long delays in accepting, acking, etc.
 243          */
 244         if (request_threaded_irq(dev->host_irq, NULL, kvm_assigned_dev_thread,
 245                                  IRQF_ONESHOT, dev->irq_name, dev))
 246                 return -EIO;
 247         return 0;
 248 }
 249
 250 #ifdef __KVM_HAVE_MSI
 251 static int assigned_device_enable_host_msi(struct kvm *kvm,
 252                                            struct kvm_assigned_dev_kernel *dev)
 253 {
 254         int r;
 255
 256         if (!dev->dev->msi_enabled) {
 257                 r = pci_enable_msi(dev->dev);
 258                 if (r)
 259                         return r;
 260         }
 261
 262         dev->host_irq = dev->dev->irq;
 263         if (request_threaded_irq(dev->host_irq, NULL, kvm_assigned_dev_thread,
 264                                  0, dev->irq_name, dev)) {
 265                 pci_disable_msi(dev->dev);
 266                 return -EIO;
 267         }
 268
 269         return 0;
 270 }
 271 #endif
 272
 273 #ifdef __KVM_HAVE_MSIX
 274 static int assigned_device_enable_host_msix(struct kvm *kvm,
 275                                             struct kvm_assigned_dev_kernel *dev)
 276 {
 277         int i, r = -EINVAL;
 278
 279         /* host_msix_entries and guest_msix_entries should have been
 280          * initialized */
 281         if (dev->entries_nr == 0)
 282                 return r;
 283
 284         r = pci_enable_msix(dev->dev, dev->host_msix_entries, dev->entries_nr);
 285         if (r)
 286                 return r;
 287
 288         for (i = 0; i < dev->entries_nr; i++) {
 289                 r = request_threaded_irq(dev->host_msix_entries[i].vector,
 290                                          NULL, kvm_assigned_dev_thread_msix,
 291                                          0, dev->irq_name, dev);
 292                 if (r)
 293                         goto err;
 294         }
 295
 296         return 0;
 297 err:
 298         for (i -= 1; i >= 0; i--)
 299                 free_irq(dev->host_msix_entries[i].vector, dev);
 300         pci_disable_msix(dev->dev);
 301         return r;
 302 }
 303
 304 #endif
 305
 306 static int assigned_device_enable_guest_intx(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 = irq->guest_irq;
 312         return 0;
 313 }
 314
 315 #ifdef __KVM_HAVE_MSI
 316 static int assigned_device_enable_guest_msi(struct kvm *kvm,
 317                         struct kvm_assigned_dev_kernel *dev,
 318                         struct kvm_assigned_irq *irq)
 319 {
 320         dev->guest_irq = irq->guest_irq;
 321         dev->ack_notifier.gsi = -1;
 322         dev->host_irq_disabled = false;
 323         return 0;
 324 }
 325 #endif
 326
 327 #ifdef __KVM_HAVE_MSIX
 328 static int assigned_device_enable_guest_msix(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 = -1;
 334         dev->host_irq_disabled = false;
 335         return 0;
 336 }
 337 #endif
 338
 339 static int assign_host_irq(struct kvm *kvm,
 340                            struct kvm_assigned_dev_kernel *dev,
 341                            __u32 host_irq_type)
 342 {
 343         int r = -EEXIST;
 344
 345         if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_MASK)
 346                 return r;
 347
 348         snprintf(dev->irq_name, sizeof(dev->irq_name), "kvm:%s",
 349                  pci_name(dev->dev));
 350
 351         switch (host_irq_type) {
 352         case KVM_DEV_IRQ_HOST_INTX:
 353                 r = assigned_device_enable_host_intx(kvm, dev);
 354                 break;
 355 #ifdef __KVM_HAVE_MSI
 356         case KVM_DEV_IRQ_HOST_MSI:
 357                 r = assigned_device_enable_host_msi(kvm, dev);
 358                 break;
 359 #endif
 360 #ifdef __KVM_HAVE_MSIX
 361         case KVM_DEV_IRQ_HOST_MSIX:
 362                 r = assigned_device_enable_host_msix(kvm, dev);
 363                 break;
 364 #endif
 365         default:
 366                 r = -EINVAL;
 367         }
 368
 369         if (!r)
 370                 dev->irq_requested_type |= host_irq_type;
 371
 372         return r;
 373 }
 374
 375 static int assign_guest_irq(struct kvm *kvm,
 376                             struct kvm_assigned_dev_kernel *dev,
 377                             struct kvm_assigned_irq *irq,
 378                             unsigned long guest_irq_type)
 379 {
 380         int id;
 381         int r = -EEXIST;
 382
 383         if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK)
 384                 return r;
 385
 386         id = kvm_request_irq_source_id(kvm);
 387         if (id < 0)
 388                 return id;
 389
 390         dev->irq_source_id = id;
 391
 392         switch (guest_irq_type) {
 393         case KVM_DEV_IRQ_GUEST_INTX:
 394                 r = assigned_device_enable_guest_intx(kvm, dev, irq);
 395                 break;
 396 #ifdef __KVM_HAVE_MSI
 397         case KVM_DEV_IRQ_GUEST_MSI:
 398                 r = assigned_device_enable_guest_msi(kvm, dev, irq);
 399                 break;
 400 #endif
 401 #ifdef __KVM_HAVE_MSIX
 402         case KVM_DEV_IRQ_GUEST_MSIX:
 403                 r = assigned_device_enable_guest_msix(kvm, dev, irq);
 404                 break;
 405 #endif
 406         default:
 407                 r = -EINVAL;
 408         }
 409
 410         if (!r) {
 411                 dev->irq_requested_type |= guest_irq_type;
 412                 if (dev->ack_notifier.gsi != -1)
 413                         kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier);
 414         } else
 415                 kvm_free_irq_source_id(kvm, dev->irq_source_id);
 416
 417         return r;
 418 }
 419
 420 /* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
 421 static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
 422                                    struct kvm_assigned_irq *assigned_irq)
 423 {
 424         int r = -EINVAL;
 425         struct kvm_assigned_dev_kernel *match;
 426         unsigned long host_irq_type, guest_irq_type;
 427
 428         if (!irqchip_in_kernel(kvm))
 429                 return r;
 430
 431         mutex_lock(&kvm->lock);
 432         r = -ENODEV;
 433         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 434                                       assigned_irq->assigned_dev_id);
 435         if (!match)
 436                 goto out;
 437
 438         host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK);
 439         guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK);
 440
 441         r = -EINVAL;
 442         /* can only assign one type at a time */
 443         if (hweight_long(host_irq_type) > 1)
 444                 goto out;
 445         if (hweight_long(guest_irq_type) > 1)
 446                 goto out;
 447         if (host_irq_type == 0 && guest_irq_type == 0)
 448                 goto out;
 449
 450         r = 0;
 451         if (host_irq_type)
 452                 r = assign_host_irq(kvm, match, host_irq_type);
 453         if (r)
 454                 goto out;
 455
 456         if (guest_irq_type)
 457                 r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type);
 458 out:
 459         mutex_unlock(&kvm->lock);
 460         return r;
 461 }
 462
 463 static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
 464                                          struct kvm_assigned_irq
 465                                          *assigned_irq)
 466 {
 467         int r = -ENODEV;
 468         struct kvm_assigned_dev_kernel *match;
 469
 470         mutex_lock(&kvm->lock);
 471
 472         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 473                                       assigned_irq->assigned_dev_id);
 474         if (!match)
 475                 goto out;
 476
 477         r = kvm_deassign_irq(kvm, match, assigned_irq->flags);
 478 out:
 479         mutex_unlock(&kvm->lock);
 480         return r;
 481 }
 482
 483 static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
 484                                       struct kvm_assigned_pci_dev *assigned_dev)
 485 {
 486         int r = 0, idx;
 487         struct kvm_assigned_dev_kernel *match;
 488         struct pci_dev *dev;
 489
 490         mutex_lock(&kvm->lock);
 491         idx = srcu_read_lock(&kvm->srcu);
 492
 493         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 494                                       assigned_dev->assigned_dev_id);
 495         if (match) {
 496                 /* device already assigned */
 497                 r = -EEXIST;
 498                 goto out;
 499         }
 500
 501         match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
 502         if (match == NULL) {
 503                 printk(KERN_INFO "%s: Couldn't allocate memory\n",
 504                        __func__);
 505                 r = -ENOMEM;
 506                 goto out;
 507         }
 508         dev = pci_get_domain_bus_and_slot(assigned_dev->segnr,
 509                                    assigned_dev->busnr,
 510                                    assigned_dev->devfn);
 511         if (!dev) {
 512                 printk(KERN_INFO "%s: host device not found\n", __func__);
 513                 r = -EINVAL;
 514                 goto out_free;
 515         }
 516         if (pci_enable_device(dev)) {
 517                 printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
 518                 r = -EBUSY;
 519                 goto out_put;
 520         }
 521         r = pci_request_regions(dev, "kvm_assigned_device");
 522         if (r) {
 523                 printk(KERN_INFO "%s: Could not get access to device regions\n",
 524                        __func__);
 525                 goto out_disable;
 526         }
 527
 528         pci_reset_function(dev);
 529         pci_save_state(dev);
 530         match->pci_saved_state = pci_store_saved_state(dev);
 531         if (!match->pci_saved_state)
 532                 printk(KERN_DEBUG "%s: Couldn't store %s saved state\n",
 533                        __func__, dev_name(&dev->dev));
 534         match->assigned_dev_id = assigned_dev->assigned_dev_id;
 535         match->host_segnr = assigned_dev->segnr;
 536         match->host_busnr = assigned_dev->busnr;
 537         match->host_devfn = assigned_dev->devfn;
 538         match->flags = assigned_dev->flags;
 539         match->dev = dev;
 540         spin_lock_init(&match->intx_lock);
 541         match->irq_source_id = -1;
 542         match->kvm = kvm;
 543         match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
 544
 545         list_add(&match->list, &kvm->arch.assigned_dev_head);
 546
 547         if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
 548                 if (!kvm->arch.iommu_domain) {
 549                         r = kvm_iommu_map_guest(kvm);
 550                         if (r)
 551                                 goto out_list_del;
 552                 }
 553                 r = kvm_assign_device(kvm, match);
 554                 if (r)
 555                         goto out_list_del;
 556         }
 557
 558 out:
 559         srcu_read_unlock(&kvm->srcu, idx);
 560         mutex_unlock(&kvm->lock);
 561         return r;
 562 out_list_del:
 563         if (pci_load_and_free_saved_state(dev, &match->pci_saved_state))
 564                 printk(KERN_INFO "%s: Couldn't reload %s saved state\n",
 565                        __func__, dev_name(&dev->dev));
 566         list_del(&match->list);
 567         pci_release_regions(dev);
 568 out_disable:
 569         pci_disable_device(dev);
 570 out_put:
 571         pci_dev_put(dev);
 572 out_free:
 573         kfree(match);
 574         srcu_read_unlock(&kvm->srcu, idx);
 575         mutex_unlock(&kvm->lock);
 576         return r;
 577 }
 578
 579 static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
 580                 struct kvm_assigned_pci_dev *assigned_dev)
 581 {
 582         int r = 0;
 583         struct kvm_assigned_dev_kernel *match;
 584
 585         mutex_lock(&kvm->lock);
 586
 587         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 588                                       assigned_dev->assigned_dev_id);
 589         if (!match) {
 590                 printk(KERN_INFO "%s: device hasn't been assigned before, "
 591                   "so cannot be deassigned\n", __func__);
 592                 r = -EINVAL;
 593                 goto out;
 594         }
 595
 596         if (match->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU)
 597                 kvm_deassign_device(kvm, match);
 598
 599         kvm_free_assigned_device(kvm, match);
 600
 601 out:
 602         mutex_unlock(&kvm->lock);
 603         return r;
 604 }
 605
 606
 607 #ifdef __KVM_HAVE_MSIX
 608 static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
 609                                     struct kvm_assigned_msix_nr *entry_nr)
 610 {
 611         int r = 0;
 612         struct kvm_assigned_dev_kernel *adev;
 613
 614         mutex_lock(&kvm->lock);
 615
 616         adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 617                                       entry_nr->assigned_dev_id);
 618         if (!adev) {
 619                 r = -EINVAL;
 620                 goto msix_nr_out;
 621         }
 622
 623         if (adev->entries_nr == 0) {
 624                 adev->entries_nr = entry_nr->entry_nr;
 625                 if (adev->entries_nr == 0 ||
 626                     adev->entries_nr > KVM_MAX_MSIX_PER_DEV) {
 627                         r = -EINVAL;
 628                         goto msix_nr_out;
 629                 }
 630
 631                 adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) *
 632                                                 entry_nr->entry_nr,
 633                                                 GFP_KERNEL);
 634                 if (!adev->host_msix_entries) {
 635                         r = -ENOMEM;
 636                         goto msix_nr_out;
 637                 }
 638                 adev->guest_msix_entries =
 639                         kzalloc(sizeof(struct msix_entry) * entry_nr->entry_nr,
 640                                 GFP_KERNEL);
 641                 if (!adev->guest_msix_entries) {
 642                         kfree(adev->host_msix_entries);
 643                         r = -ENOMEM;
 644                         goto msix_nr_out;
 645                 }
 646         } else /* Not allowed set MSI-X number twice */
 647                 r = -EINVAL;
 648 msix_nr_out:
 649         mutex_unlock(&kvm->lock);
 650         return r;
 651 }
 652
 653 static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm,
 654                                        struct kvm_assigned_msix_entry *entry)
 655 {
 656         int r = 0, i;
 657         struct kvm_assigned_dev_kernel *adev;
 658
 659         mutex_lock(&kvm->lock);
 660
 661         adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 662                                       entry->assigned_dev_id);
 663
 664         if (!adev) {
 665                 r = -EINVAL;
 666                 goto msix_entry_out;
 667         }
 668
 669         for (i = 0; i < adev->entries_nr; i++)
 670                 if (adev->guest_msix_entries[i].vector == 0 ||
 671                     adev->guest_msix_entries[i].entry == entry->entry) {
 672                         adev->guest_msix_entries[i].entry = entry->entry;
 673                         adev->guest_msix_entries[i].vector = entry->gsi;
 674                         adev->host_msix_entries[i].entry = entry->entry;
 675                         break;
 676                 }
 677         if (i == adev->entries_nr) {
 678                 r = -ENOSPC;
 679                 goto msix_entry_out;
 680         }
 681
 682 msix_entry_out:
 683         mutex_unlock(&kvm->lock);
 684
 685         return r;
 686 }
 687 #endif
 688
 689 long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 690                                   unsigned long arg)
 691 {
 692         void __user *argp = (void __user *)arg;
 693         int r;
 694
 695         switch (ioctl) {
 696         case KVM_ASSIGN_PCI_DEVICE: {
 697                 struct kvm_assigned_pci_dev assigned_dev;
 698
 699                 r = -EFAULT;
 700                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
 701                         goto out;
 702                 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
 703                 if (r)
 704                         goto out;
 705                 break;
 706         }
 707         case KVM_ASSIGN_IRQ: {
 708                 r = -EOPNOTSUPP;
 709                 break;
 710         }
 711         case KVM_ASSIGN_DEV_IRQ: {
 712                 struct kvm_assigned_irq assigned_irq;
 713
 714                 r = -EFAULT;
 715                 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
 716                         goto out;
 717                 r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
 718                 if (r)
 719                         goto out;
 720                 break;
 721         }
 722         case KVM_DEASSIGN_DEV_IRQ: {
 723                 struct kvm_assigned_irq assigned_irq;
 724
 725                 r = -EFAULT;
 726                 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
 727                         goto out;
 728                 r = kvm_vm_ioctl_deassign_dev_irq(kvm, &assigned_irq);
 729                 if (r)
 730                         goto out;
 731                 break;
 732         }
 733         case KVM_DEASSIGN_PCI_DEVICE: {
 734                 struct kvm_assigned_pci_dev assigned_dev;
 735
 736                 r = -EFAULT;
 737                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
 738                         goto out;
 739                 r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
 740                 if (r)
 741                         goto out;
 742                 break;
 743         }
 744 #ifdef KVM_CAP_IRQ_ROUTING
 745         case KVM_SET_GSI_ROUTING: {
 746                 struct kvm_irq_routing routing;
 747                 struct kvm_irq_routing __user *urouting;
 748                 struct kvm_irq_routing_entry *entries;
 749
 750                 r = -EFAULT;
 751                 if (copy_from_user(&routing, argp, sizeof(routing)))
 752                         goto out;
 753                 r = -EINVAL;
 754                 if (routing.nr >= KVM_MAX_IRQ_ROUTES)
 755                         goto out;
 756                 if (routing.flags)
 757                         goto out;
 758                 r = -ENOMEM;
 759                 entries = vmalloc(routing.nr * sizeof(*entries));
 760                 if (!entries)
 761                         goto out;
 762                 r = -EFAULT;
 763                 urouting = argp;
 764                 if (copy_from_user(entries, urouting->entries,
 765                                    routing.nr * sizeof(*entries)))
 766                         goto out_free_irq_routing;
 767                 r = kvm_set_irq_routing(kvm, entries, routing.nr,
 768                                         routing.flags);
 769         out_free_irq_routing:
 770                 vfree(entries);
 771                 break;
 772         }
 773 #endif /* KVM_CAP_IRQ_ROUTING */
 774 #ifdef __KVM_HAVE_MSIX
 775         case KVM_ASSIGN_SET_MSIX_NR: {
 776                 struct kvm_assigned_msix_nr entry_nr;
 777                 r = -EFAULT;
 778                 if (copy_from_user(&entry_nr, argp, sizeof entry_nr))
 779                         goto out;
 780                 r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr);
 781                 if (r)
 782                         goto out;
 783                 break;
 784         }
 785         case KVM_ASSIGN_SET_MSIX_ENTRY: {
 786                 struct kvm_assigned_msix_entry entry;
 787                 r = -EFAULT;
 788                 if (copy_from_user(&entry, argp, sizeof entry))
 789                         goto out;
 790                 r = kvm_vm_ioctl_set_msix_entry(kvm, &entry);
 791                 if (r)
 792                         goto out;
 793                 break;
 794         }
 795 #endif
 796         default:
 797                 r = -ENOTTY;
 798                 break;
 799         }
 800 out:
 801         return r;
 802 }
 803