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         if (pci_load_and_free_saved_state(assigned_dev->dev,
 202                                           &assigned_dev->pci_saved_state))
 203                 printk(KERN_INFO "%s: Couldn't reload %s saved state\n",
 204                        __func__, dev_name(&assigned_dev->dev->dev));
 205         else
 206                 pci_restore_state(assigned_dev->dev);
 207
 208         pci_release_regions(assigned_dev->dev);
 209         pci_disable_device(assigned_dev->dev);
 210         pci_dev_put(assigned_dev->dev);
 211
 212         list_del(&assigned_dev->list);
 213         kfree(assigned_dev);
 214 }
 215
 216 void kvm_free_all_assigned_devices(struct kvm *kvm)
 217 {
 218         struct list_head *ptr, *ptr2;
 219         struct kvm_assigned_dev_kernel *assigned_dev;
 220
 221         list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
 222                 assigned_dev = list_entry(ptr,
 223                                           struct kvm_assigned_dev_kernel,
 224                                           list);
 225
 226                 kvm_free_assigned_device(kvm, assigned_dev);
 227         }
 228 }
 229
 230 static int assigned_device_enable_host_intx(struct kvm *kvm,
 231                                             struct kvm_assigned_dev_kernel *dev)
 232 {
 233         dev->host_irq = dev->dev->irq;
 234         /* Even though this is PCI, we don't want to use shared
 235          * interrupts. Sharing host devices with guest-assigned devices
 236          * on the same interrupt line is not a happy situation: there
 237          * are going to be long delays in accepting, acking, etc.
 238          */
 239         if (request_threaded_irq(dev->host_irq, NULL, kvm_assigned_dev_thread,
 240                                  IRQF_ONESHOT, dev->irq_name, (void *)dev))
 241                 return -EIO;
 242         return 0;
 243 }
 244
 245 #ifdef __KVM_HAVE_MSI
 246 static int assigned_device_enable_host_msi(struct kvm *kvm,
 247                                            struct kvm_assigned_dev_kernel *dev)
 248 {
 249         int r;
 250
 251         if (!dev->dev->msi_enabled) {
 252                 r = pci_enable_msi(dev->dev);
 253                 if (r)
 254                         return r;
 255         }
 256
 257         dev->host_irq = dev->dev->irq;
 258         if (request_threaded_irq(dev->host_irq, NULL, kvm_assigned_dev_thread,
 259                                  0, dev->irq_name, (void *)dev)) {
 260                 pci_disable_msi(dev->dev);
 261                 return -EIO;
 262         }
 263
 264         return 0;
 265 }
 266 #endif
 267
 268 #ifdef __KVM_HAVE_MSIX
 269 static int assigned_device_enable_host_msix(struct kvm *kvm,
 270                                             struct kvm_assigned_dev_kernel *dev)
 271 {
 272         int i, r = -EINVAL;
 273
 274         /* host_msix_entries and guest_msix_entries should have been
 275          * initialized */
 276         if (dev->entries_nr == 0)
 277                 return r;
 278
 279         r = pci_enable_msix(dev->dev, dev->host_msix_entries, dev->entries_nr);
 280         if (r)
 281                 return r;
 282
 283         for (i = 0; i < dev->entries_nr; i++) {
 284                 r = request_threaded_irq(dev->host_msix_entries[i].vector,
 285                                          NULL, kvm_assigned_dev_thread,
 286                                          0, dev->irq_name, (void *)dev);
 287                 if (r)
 288                         goto err;
 289         }
 290
 291         return 0;
 292 err:
 293         for (i -= 1; i >= 0; i--)
 294                 free_irq(dev->host_msix_entries[i].vector, (void *)dev);
 295         pci_disable_msix(dev->dev);
 296         return r;
 297 }
 298
 299 #endif
 300
 301 static int assigned_device_enable_guest_intx(struct kvm *kvm,
 302                                 struct kvm_assigned_dev_kernel *dev,
 303                                 struct kvm_assigned_irq *irq)
 304 {
 305         dev->guest_irq = irq->guest_irq;
 306         dev->ack_notifier.gsi = irq->guest_irq;
 307         return 0;
 308 }
 309
 310 #ifdef __KVM_HAVE_MSI
 311 static int assigned_device_enable_guest_msi(struct kvm *kvm,
 312                         struct kvm_assigned_dev_kernel *dev,
 313                         struct kvm_assigned_irq *irq)
 314 {
 315         dev->guest_irq = irq->guest_irq;
 316         dev->ack_notifier.gsi = -1;
 317         dev->host_irq_disabled = false;
 318         return 0;
 319 }
 320 #endif
 321
 322 #ifdef __KVM_HAVE_MSIX
 323 static int assigned_device_enable_guest_msix(struct kvm *kvm,
 324                         struct kvm_assigned_dev_kernel *dev,
 325                         struct kvm_assigned_irq *irq)
 326 {
 327         dev->guest_irq = irq->guest_irq;
 328         dev->ack_notifier.gsi = -1;
 329         dev->host_irq_disabled = false;
 330         return 0;
 331 }
 332 #endif
 333
 334 static int assign_host_irq(struct kvm *kvm,
 335                            struct kvm_assigned_dev_kernel *dev,
 336                            __u32 host_irq_type)
 337 {
 338         int r = -EEXIST;
 339
 340         if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_MASK)
 341                 return r;
 342
 343         snprintf(dev->irq_name, sizeof(dev->irq_name), "kvm:%s",
 344                  pci_name(dev->dev));
 345
 346         switch (host_irq_type) {
 347         case KVM_DEV_IRQ_HOST_INTX:
 348                 r = assigned_device_enable_host_intx(kvm, dev);
 349                 break;
 350 #ifdef __KVM_HAVE_MSI
 351         case KVM_DEV_IRQ_HOST_MSI:
 352                 r = assigned_device_enable_host_msi(kvm, dev);
 353                 break;
 354 #endif
 355 #ifdef __KVM_HAVE_MSIX
 356         case KVM_DEV_IRQ_HOST_MSIX:
 357                 r = assigned_device_enable_host_msix(kvm, dev);
 358                 break;
 359 #endif
 360         default:
 361                 r = -EINVAL;
 362         }
 363
 364         if (!r)
 365                 dev->irq_requested_type |= host_irq_type;
 366
 367         return r;
 368 }
 369
 370 static int assign_guest_irq(struct kvm *kvm,
 371                             struct kvm_assigned_dev_kernel *dev,
 372                             struct kvm_assigned_irq *irq,
 373                             unsigned long guest_irq_type)
 374 {
 375         int id;
 376         int r = -EEXIST;
 377
 378         if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK)
 379                 return r;
 380
 381         id = kvm_request_irq_source_id(kvm);
 382         if (id < 0)
 383                 return id;
 384
 385         dev->irq_source_id = id;
 386
 387         switch (guest_irq_type) {
 388         case KVM_DEV_IRQ_GUEST_INTX:
 389                 r = assigned_device_enable_guest_intx(kvm, dev, irq);
 390                 break;
 391 #ifdef __KVM_HAVE_MSI
 392         case KVM_DEV_IRQ_GUEST_MSI:
 393                 r = assigned_device_enable_guest_msi(kvm, dev, irq);
 394                 break;
 395 #endif
 396 #ifdef __KVM_HAVE_MSIX
 397         case KVM_DEV_IRQ_GUEST_MSIX:
 398                 r = assigned_device_enable_guest_msix(kvm, dev, irq);
 399                 break;
 400 #endif
 401         default:
 402                 r = -EINVAL;
 403         }
 404
 405         if (!r) {
 406                 dev->irq_requested_type |= guest_irq_type;
 407                 kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier);
 408         } else
 409                 kvm_free_irq_source_id(kvm, dev->irq_source_id);
 410
 411         return r;
 412 }
 413
 414 /* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
 415 static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
 416                                    struct kvm_assigned_irq *assigned_irq)
 417 {
 418         int r = -EINVAL;
 419         struct kvm_assigned_dev_kernel *match;
 420         unsigned long host_irq_type, guest_irq_type;
 421
 422         if (!irqchip_in_kernel(kvm))
 423                 return r;
 424
 425         mutex_lock(&kvm->lock);
 426         r = -ENODEV;
 427         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 428                                       assigned_irq->assigned_dev_id);
 429         if (!match)
 430                 goto out;
 431
 432         host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK);
 433         guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK);
 434
 435         r = -EINVAL;
 436         /* can only assign one type at a time */
 437         if (hweight_long(host_irq_type) > 1)
 438                 goto out;
 439         if (hweight_long(guest_irq_type) > 1)
 440                 goto out;
 441         if (host_irq_type == 0 && guest_irq_type == 0)
 442                 goto out;
 443
 444         r = 0;
 445         if (host_irq_type)
 446                 r = assign_host_irq(kvm, match, host_irq_type);
 447         if (r)
 448                 goto out;
 449
 450         if (guest_irq_type)
 451                 r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type);
 452 out:
 453         mutex_unlock(&kvm->lock);
 454         return r;
 455 }
 456
 457 static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
 458                                          struct kvm_assigned_irq
 459                                          *assigned_irq)
 460 {
 461         int r = -ENODEV;
 462         struct kvm_assigned_dev_kernel *match;
 463
 464         mutex_lock(&kvm->lock);
 465
 466         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 467                                       assigned_irq->assigned_dev_id);
 468         if (!match)
 469                 goto out;
 470
 471         r = kvm_deassign_irq(kvm, match, assigned_irq->flags);
 472 out:
 473         mutex_unlock(&kvm->lock);
 474         return r;
 475 }
 476
 477 static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
 478                                       struct kvm_assigned_pci_dev *assigned_dev)
 479 {
 480         int r = 0, idx;
 481         struct kvm_assigned_dev_kernel *match;
 482         struct pci_dev *dev;
 483
 484         mutex_lock(&kvm->lock);
 485         idx = srcu_read_lock(&kvm->srcu);
 486
 487         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 488                                       assigned_dev->assigned_dev_id);
 489         if (match) {
 490                 /* device already assigned */
 491                 r = -EEXIST;
 492                 goto out;
 493         }
 494
 495         match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
 496         if (match == NULL) {
 497                 printk(KERN_INFO "%s: Couldn't allocate memory\n",
 498                        __func__);
 499                 r = -ENOMEM;
 500                 goto out;
 501         }
 502         dev = pci_get_domain_bus_and_slot(assigned_dev->segnr,
 503                                    assigned_dev->busnr,
 504                                    assigned_dev->devfn);
 505         if (!dev) {
 506                 printk(KERN_INFO "%s: host device not found\n", __func__);
 507                 r = -EINVAL;
 508                 goto out_free;
 509         }
 510         if (pci_enable_device(dev)) {
 511                 printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
 512                 r = -EBUSY;
 513                 goto out_put;
 514         }
 515         r = pci_request_regions(dev, "kvm_assigned_device");
 516         if (r) {
 517                 printk(KERN_INFO "%s: Could not get access to device regions\n",
 518                        __func__);
 519                 goto out_disable;
 520         }
 521
 522         pci_reset_function(dev);
 523         pci_save_state(dev);
 524         match->pci_saved_state = pci_store_saved_state(dev);
 525         if (!match->pci_saved_state)
 526                 printk(KERN_DEBUG "%s: Couldn't store %s saved state\n",
 527                        __func__, dev_name(&dev->dev));
 528         match->assigned_dev_id = assigned_dev->assigned_dev_id;
 529         match->host_segnr = assigned_dev->segnr;
 530         match->host_busnr = assigned_dev->busnr;
 531         match->host_devfn = assigned_dev->devfn;
 532         match->flags = assigned_dev->flags;
 533         match->dev = dev;
 534         spin_lock_init(&match->intx_lock);
 535         match->irq_source_id = -1;
 536         match->kvm = kvm;
 537         match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
 538
 539         list_add(&match->list, &kvm->arch.assigned_dev_head);
 540
 541         if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
 542                 if (!kvm->arch.iommu_domain) {
 543                         r = kvm_iommu_map_guest(kvm);
 544                         if (r)
 545                                 goto out_list_del;
 546                 }
 547                 r = kvm_assign_device(kvm, match);
 548                 if (r)
 549                         goto out_list_del;
 550         }
 551
 552 out:
 553         srcu_read_unlock(&kvm->srcu, idx);
 554         mutex_unlock(&kvm->lock);
 555         return r;
 556 out_list_del:
 557         if (pci_load_and_free_saved_state(dev, &match->pci_saved_state))
 558                 printk(KERN_INFO "%s: Couldn't reload %s saved state\n",
 559                        __func__, dev_name(&dev->dev));
 560         list_del(&match->list);
 561         pci_release_regions(dev);
 562 out_disable:
 563         pci_disable_device(dev);
 564 out_put:
 565         pci_dev_put(dev);
 566 out_free:
 567         kfree(match);
 568         srcu_read_unlock(&kvm->srcu, idx);
 569         mutex_unlock(&kvm->lock);
 570         return r;
 571 }
 572
 573 static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
 574                 struct kvm_assigned_pci_dev *assigned_dev)
 575 {
 576         int r = 0;
 577         struct kvm_assigned_dev_kernel *match;
 578
 579         mutex_lock(&kvm->lock);
 580
 581         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 582                                       assigned_dev->assigned_dev_id);
 583         if (!match) {
 584                 printk(KERN_INFO "%s: device hasn't been assigned before, "
 585                   "so cannot be deassigned\n", __func__);
 586                 r = -EINVAL;
 587                 goto out;
 588         }
 589
 590         if (match->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU)
 591                 kvm_deassign_device(kvm, match);
 592
 593         kvm_free_assigned_device(kvm, match);
 594
 595 out:
 596         mutex_unlock(&kvm->lock);
 597         return r;
 598 }
 599
 600
 601 #ifdef __KVM_HAVE_MSIX
 602 static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
 603                                     struct kvm_assigned_msix_nr *entry_nr)
 604 {
 605         int r = 0;
 606         struct kvm_assigned_dev_kernel *adev;
 607
 608         mutex_lock(&kvm->lock);
 609
 610         adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 611                                       entry_nr->assigned_dev_id);
 612         if (!adev) {
 613                 r = -EINVAL;
 614                 goto msix_nr_out;
 615         }
 616
 617         if (adev->entries_nr == 0) {
 618                 adev->entries_nr = entry_nr->entry_nr;
 619                 if (adev->entries_nr == 0 ||
 620                     adev->entries_nr >= KVM_MAX_MSIX_PER_DEV) {
 621                         r = -EINVAL;
 622                         goto msix_nr_out;
 623                 }
 624
 625                 adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) *
 626                                                 entry_nr->entry_nr,
 627                                                 GFP_KERNEL);
 628                 if (!adev->host_msix_entries) {
 629                         r = -ENOMEM;
 630                         goto msix_nr_out;
 631                 }
 632                 adev->guest_msix_entries =
 633                         kzalloc(sizeof(struct msix_entry) * entry_nr->entry_nr,
 634                                 GFP_KERNEL);
 635                 if (!adev->guest_msix_entries) {
 636                         kfree(adev->host_msix_entries);
 637                         r = -ENOMEM;
 638                         goto msix_nr_out;
 639                 }
 640         } else /* Not allowed set MSI-X number twice */
 641                 r = -EINVAL;
 642 msix_nr_out:
 643         mutex_unlock(&kvm->lock);
 644         return r;
 645 }
 646
 647 static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm,
 648                                        struct kvm_assigned_msix_entry *entry)
 649 {
 650         int r = 0, i;
 651         struct kvm_assigned_dev_kernel *adev;
 652
 653         mutex_lock(&kvm->lock);
 654
 655         adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 656                                       entry->assigned_dev_id);
 657
 658         if (!adev) {
 659                 r = -EINVAL;
 660                 goto msix_entry_out;
 661         }
 662
 663         for (i = 0; i < adev->entries_nr; i++)
 664                 if (adev->guest_msix_entries[i].vector == 0 ||
 665                     adev->guest_msix_entries[i].entry == entry->entry) {
 666                         adev->guest_msix_entries[i].entry = entry->entry;
 667                         adev->guest_msix_entries[i].vector = entry->gsi;
 668                         adev->host_msix_entries[i].entry = entry->entry;
 669                         break;
 670                 }
 671         if (i == adev->entries_nr) {
 672                 r = -ENOSPC;
 673                 goto msix_entry_out;
 674         }
 675
 676 msix_entry_out:
 677         mutex_unlock(&kvm->lock);
 678
 679         return r;
 680 }
 681 #endif
 682
 683 long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 684                                   unsigned long arg)
 685 {
 686         void __user *argp = (void __user *)arg;
 687         int r;
 688
 689         switch (ioctl) {
 690         case KVM_ASSIGN_PCI_DEVICE: {
 691                 struct kvm_assigned_pci_dev assigned_dev;
 692
 693                 r = -EFAULT;
 694                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
 695                         goto out;
 696                 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
 697                 if (r)
 698                         goto out;
 699                 break;
 700         }
 701         case KVM_ASSIGN_IRQ: {
 702                 r = -EOPNOTSUPP;
 703                 break;
 704         }
 705         case KVM_ASSIGN_DEV_IRQ: {
 706                 struct kvm_assigned_irq assigned_irq;
 707
 708                 r = -EFAULT;
 709                 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
 710                         goto out;
 711                 r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
 712                 if (r)
 713                         goto out;
 714                 break;
 715         }
 716         case KVM_DEASSIGN_DEV_IRQ: {
 717                 struct kvm_assigned_irq assigned_irq;
 718
 719                 r = -EFAULT;
 720                 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
 721                         goto out;
 722                 r = kvm_vm_ioctl_deassign_dev_irq(kvm, &assigned_irq);
 723                 if (r)
 724                         goto out;
 725                 break;
 726         }
 727         case KVM_DEASSIGN_PCI_DEVICE: {
 728                 struct kvm_assigned_pci_dev assigned_dev;
 729
 730                 r = -EFAULT;
 731                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
 732                         goto out;
 733                 r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
 734                 if (r)
 735                         goto out;
 736                 break;
 737         }
 738 #ifdef KVM_CAP_IRQ_ROUTING
 739         case KVM_SET_GSI_ROUTING: {
 740                 struct kvm_irq_routing routing;
 741                 struct kvm_irq_routing __user *urouting;
 742                 struct kvm_irq_routing_entry *entries;
 743
 744                 r = -EFAULT;
 745                 if (copy_from_user(&routing, argp, sizeof(routing)))
 746                         goto out;
 747                 r = -EINVAL;
 748                 if (routing.nr >= KVM_MAX_IRQ_ROUTES)
 749                         goto out;
 750                 if (routing.flags)
 751                         goto out;
 752                 r = -ENOMEM;
 753                 entries = vmalloc(routing.nr * sizeof(*entries));
 754                 if (!entries)
 755                         goto out;
 756                 r = -EFAULT;
 757                 urouting = argp;
 758                 if (copy_from_user(entries, urouting->entries,
 759                                    routing.nr * sizeof(*entries)))
 760                         goto out_free_irq_routing;
 761                 r = kvm_set_irq_routing(kvm, entries, routing.nr,
 762                                         routing.flags);
 763         out_free_irq_routing:
 764                 vfree(entries);
 765                 break;
 766         }
 767 #endif /* KVM_CAP_IRQ_ROUTING */
 768 #ifdef __KVM_HAVE_MSIX
 769         case KVM_ASSIGN_SET_MSIX_NR: {
 770                 struct kvm_assigned_msix_nr entry_nr;
 771                 r = -EFAULT;
 772                 if (copy_from_user(&entry_nr, argp, sizeof entry_nr))
 773                         goto out;
 774                 r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr);
 775                 if (r)
 776                         goto out;
 777                 break;
 778         }
 779         case KVM_ASSIGN_SET_MSIX_ENTRY: {
 780                 struct kvm_assigned_msix_entry entry;
 781                 r = -EFAULT;
 782                 if (copy_from_user(&entry, argp, sizeof entry))
 783                         goto out;
 784                 r = kvm_vm_ioctl_set_msix_entry(kvm, &entry);
 785                 if (r)
 786                         goto out;
 787                 break;
 788         }
 789 #endif
 790         default:
 791                 r = -ENOTTY;
 792                 break;
 793         }
 794 out:
 795         return r;
 796 }
 797