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 <linux/namei.h>
  21 #include <linux/fs.h>
  22 #include "irq.h"
  23
  24 static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head *head,
  25                                                       int assigned_dev_id)
  26 {
  27         struct list_head *ptr;
  28         struct kvm_assigned_dev_kernel *match;
  29
  30         list_for_each(ptr, head) {
  31                 match = list_entry(ptr, struct kvm_assigned_dev_kernel, list);
  32                 if (match->assigned_dev_id == assigned_dev_id)
  33                         return match;
  34         }
  35         return NULL;
  36 }
  37
  38 static int find_index_from_host_irq(struct kvm_assigned_dev_kernel
  39                                     *assigned_dev, int irq)
  40 {
  41         int i, index;
  42         struct msix_entry *host_msix_entries;
  43
  44         host_msix_entries = assigned_dev->host_msix_entries;
  45
  46         index = -1;
  47         for (i = 0; i < assigned_dev->entries_nr; i++)
  48                 if (irq == host_msix_entries[i].vector) {
  49                         index = i;
  50                         break;
  51                 }
  52         if (index < 0) {
  53                 printk(KERN_WARNING "Fail to find correlated MSI-X entry!\n");
  54                 return 0;
  55         }
  56
  57         return index;
  58 }
  59
  60 static irqreturn_t kvm_assigned_dev_thread(int irq, void *dev_id)
  61 {
  62         struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
  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         kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
  72                     assigned_dev->guest_irq, 1);
  73
  74         return IRQ_HANDLED;
  75 }
  76
  77 #ifdef __KVM_HAVE_MSIX
  78 static irqreturn_t kvm_assigned_dev_thread_msix(int irq, void *dev_id)
  79 {
  80         struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
  81         int index = find_index_from_host_irq(assigned_dev, irq);
  82         u32 vector;
  83
  84         if (index >= 0) {
  85                 vector = assigned_dev->guest_msix_entries[index].vector;
  86                 kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
  87                             vector, 1);
  88         }
  89
  90         return IRQ_HANDLED;
  91 }
  92 #endif
  93
  94 /* Ack the irq line for an assigned device */
  95 static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
  96 {
  97         struct kvm_assigned_dev_kernel *dev =
  98                 container_of(kian, struct kvm_assigned_dev_kernel,
  99                              ack_notifier);
 100
 101         kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0);
 102
 103         /* The guest irq may be shared so this ack may be
 104          * from another device.
 105          */
 106         spin_lock(&dev->intx_lock);
 107         if (dev->host_irq_disabled) {
 108                 enable_irq(dev->host_irq);
 109                 dev->host_irq_disabled = false;
 110         }
 111         spin_unlock(&dev->intx_lock);
 112 }
 113
 114 static void deassign_guest_irq(struct kvm *kvm,
 115                                struct kvm_assigned_dev_kernel *assigned_dev)
 116 {
 117         if (assigned_dev->ack_notifier.gsi != -1)
 118                 kvm_unregister_irq_ack_notifier(kvm,
 119                                                 &assigned_dev->ack_notifier);
 120
 121         kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
 122                     assigned_dev->guest_irq, 0);
 123
 124         if (assigned_dev->irq_source_id != -1)
 125                 kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
 126         assigned_dev->irq_source_id = -1;
 127         assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_GUEST_MASK);
 128 }
 129
 130 /* The function implicit hold kvm->lock mutex due to cancel_work_sync() */
 131 static void deassign_host_irq(struct kvm *kvm,
 132                               struct kvm_assigned_dev_kernel *assigned_dev)
 133 {
 134         /*
 135          * We disable irq here to prevent further events.
 136          *
 137          * Notice this maybe result in nested disable if the interrupt type is
 138          * INTx, but it's OK for we are going to free it.
 139          *
 140          * If this function is a part of VM destroy, please ensure that till
 141          * now, the kvm state is still legal for probably we also have to wait
 142          * on a currently running IRQ handler.
 143          */
 144         if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
 145                 int i;
 146                 for (i = 0; i < assigned_dev->entries_nr; i++)
 147                         disable_irq(assigned_dev->host_msix_entries[i].vector);
 148
 149                 for (i = 0; i < assigned_dev->entries_nr; i++)
 150                         free_irq(assigned_dev->host_msix_entries[i].vector,
 151                                  assigned_dev);
 152
 153                 assigned_dev->entries_nr = 0;
 154                 kfree(assigned_dev->host_msix_entries);
 155                 kfree(assigned_dev->guest_msix_entries);
 156                 pci_disable_msix(assigned_dev->dev);
 157         } else {
 158                 /* Deal with MSI and INTx */
 159                 disable_irq(assigned_dev->host_irq);
 160
 161                 free_irq(assigned_dev->host_irq, assigned_dev);
 162
 163                 if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSI)
 164                         pci_disable_msi(assigned_dev->dev);
 165         }
 166
 167         assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_HOST_MASK);
 168 }
 169
 170 static int kvm_deassign_irq(struct kvm *kvm,
 171                             struct kvm_assigned_dev_kernel *assigned_dev,
 172                             unsigned long irq_requested_type)
 173 {
 174         unsigned long guest_irq_type, host_irq_type;
 175
 176         if (!irqchip_in_kernel(kvm))
 177                 return -EINVAL;
 178         /* no irq assignment to deassign */
 179         if (!assigned_dev->irq_requested_type)
 180                 return -ENXIO;
 181
 182         host_irq_type = irq_requested_type & KVM_DEV_IRQ_HOST_MASK;
 183         guest_irq_type = irq_requested_type & KVM_DEV_IRQ_GUEST_MASK;
 184
 185         if (host_irq_type)
 186                 deassign_host_irq(kvm, assigned_dev);
 187         if (guest_irq_type)
 188                 deassign_guest_irq(kvm, assigned_dev);
 189
 190         return 0;
 191 }
 192
 193 static void kvm_free_assigned_irq(struct kvm *kvm,
 194                                   struct kvm_assigned_dev_kernel *assigned_dev)
 195 {
 196         kvm_deassign_irq(kvm, assigned_dev, assigned_dev->irq_requested_type);
 197 }
 198
 199 static void kvm_free_assigned_device(struct kvm *kvm,
 200                                      struct kvm_assigned_dev_kernel
 201                                      *assigned_dev)
 202 {
 203         kvm_free_assigned_irq(kvm, assigned_dev);
 204
 205         pci_reset_function(assigned_dev->dev);
 206         if (pci_load_and_free_saved_state(assigned_dev->dev,
 207                                           &assigned_dev->pci_saved_state))
 208                 printk(KERN_INFO "%s: Couldn't reload %s saved state\n",
 209                        __func__, dev_name(&assigned_dev->dev->dev));
 210         else
 211                 pci_restore_state(assigned_dev->dev);
 212
 213         assigned_dev->dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
 214
 215         pci_release_regions(assigned_dev->dev);
 216         pci_disable_device(assigned_dev->dev);
 217         pci_dev_put(assigned_dev->dev);
 218
 219         list_del(&assigned_dev->list);
 220         kfree(assigned_dev);
 221 }
 222
 223 void kvm_free_all_assigned_devices(struct kvm *kvm)
 224 {
 225         struct list_head *ptr, *ptr2;
 226         struct kvm_assigned_dev_kernel *assigned_dev;
 227
 228         list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
 229                 assigned_dev = list_entry(ptr,
 230                                           struct kvm_assigned_dev_kernel,
 231                                           list);
 232
 233                 kvm_free_assigned_device(kvm, assigned_dev);
 234         }
 235 }
 236
 237 static int assigned_device_enable_host_intx(struct kvm *kvm,
 238                                             struct kvm_assigned_dev_kernel *dev)
 239 {
 240         dev->host_irq = dev->dev->irq;
 241         /* Even though this is PCI, we don't want to use shared
 242          * interrupts. Sharing host devices with guest-assigned devices
 243          * on the same interrupt line is not a happy situation: there
 244          * are going to be long delays in accepting, acking, etc.
 245          */
 246         if (request_threaded_irq(dev->host_irq, NULL, kvm_assigned_dev_thread,
 247                                  IRQF_ONESHOT, dev->irq_name, dev))
 248                 return -EIO;
 249         return 0;
 250 }
 251
 252 #ifdef __KVM_HAVE_MSI
 253 static int assigned_device_enable_host_msi(struct kvm *kvm,
 254                                            struct kvm_assigned_dev_kernel *dev)
 255 {
 256         int r;
 257
 258         if (!dev->dev->msi_enabled) {
 259                 r = pci_enable_msi(dev->dev);
 260                 if (r)
 261                         return r;
 262         }
 263
 264         dev->host_irq = dev->dev->irq;
 265         if (request_threaded_irq(dev->host_irq, NULL, kvm_assigned_dev_thread,
 266                                  0, dev->irq_name, dev)) {
 267                 pci_disable_msi(dev->dev);
 268                 return -EIO;
 269         }
 270
 271         return 0;
 272 }
 273 #endif
 274
 275 #ifdef __KVM_HAVE_MSIX
 276 static int assigned_device_enable_host_msix(struct kvm *kvm,
 277                                             struct kvm_assigned_dev_kernel *dev)
 278 {
 279         int i, r = -EINVAL;
 280
 281         /* host_msix_entries and guest_msix_entries should have been
 282          * initialized */
 283         if (dev->entries_nr == 0)
 284                 return r;
 285
 286         r = pci_enable_msix(dev->dev, dev->host_msix_entries, dev->entries_nr);
 287         if (r)
 288                 return r;
 289
 290         for (i = 0; i < dev->entries_nr; i++) {
 291                 r = request_threaded_irq(dev->host_msix_entries[i].vector,
 292                                          NULL, kvm_assigned_dev_thread_msix,
 293                                          0, dev->irq_name, dev);
 294                 if (r)
 295                         goto err;
 296         }
 297
 298         return 0;
 299 err:
 300         for (i -= 1; i >= 0; i--)
 301                 free_irq(dev->host_msix_entries[i].vector, dev);
 302         pci_disable_msix(dev->dev);
 303         return r;
 304 }
 305
 306 #endif
 307
 308 static int assigned_device_enable_guest_intx(struct kvm *kvm,
 309                                 struct kvm_assigned_dev_kernel *dev,
 310                                 struct kvm_assigned_irq *irq)
 311 {
 312         dev->guest_irq = irq->guest_irq;
 313         dev->ack_notifier.gsi = irq->guest_irq;
 314         return 0;
 315 }
 316
 317 #ifdef __KVM_HAVE_MSI
 318 static int assigned_device_enable_guest_msi(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 #ifdef __KVM_HAVE_MSIX
 330 static int assigned_device_enable_guest_msix(struct kvm *kvm,
 331                         struct kvm_assigned_dev_kernel *dev,
 332                         struct kvm_assigned_irq *irq)
 333 {
 334         dev->guest_irq = irq->guest_irq;
 335         dev->ack_notifier.gsi = -1;
 336         dev->host_irq_disabled = false;
 337         return 0;
 338 }
 339 #endif
 340
 341 static int assign_host_irq(struct kvm *kvm,
 342                            struct kvm_assigned_dev_kernel *dev,
 343                            __u32 host_irq_type)
 344 {
 345         int r = -EEXIST;
 346
 347         if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_MASK)
 348                 return r;
 349
 350         snprintf(dev->irq_name, sizeof(dev->irq_name), "kvm:%s",
 351                  pci_name(dev->dev));
 352
 353         switch (host_irq_type) {
 354         case KVM_DEV_IRQ_HOST_INTX:
 355                 r = assigned_device_enable_host_intx(kvm, dev);
 356                 break;
 357 #ifdef __KVM_HAVE_MSI
 358         case KVM_DEV_IRQ_HOST_MSI:
 359                 r = assigned_device_enable_host_msi(kvm, dev);
 360                 break;
 361 #endif
 362 #ifdef __KVM_HAVE_MSIX
 363         case KVM_DEV_IRQ_HOST_MSIX:
 364                 r = assigned_device_enable_host_msix(kvm, dev);
 365                 break;
 366 #endif
 367         default:
 368                 r = -EINVAL;
 369         }
 370
 371         if (!r)
 372                 dev->irq_requested_type |= host_irq_type;
 373
 374         return r;
 375 }
 376
 377 static int assign_guest_irq(struct kvm *kvm,
 378                             struct kvm_assigned_dev_kernel *dev,
 379                             struct kvm_assigned_irq *irq,
 380                             unsigned long guest_irq_type)
 381 {
 382         int id;
 383         int r = -EEXIST;
 384
 385         if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK)
 386                 return r;
 387
 388         id = kvm_request_irq_source_id(kvm);
 389         if (id < 0)
 390                 return id;
 391
 392         dev->irq_source_id = id;
 393
 394         switch (guest_irq_type) {
 395         case KVM_DEV_IRQ_GUEST_INTX:
 396                 r = assigned_device_enable_guest_intx(kvm, dev, irq);
 397                 break;
 398 #ifdef __KVM_HAVE_MSI
 399         case KVM_DEV_IRQ_GUEST_MSI:
 400                 r = assigned_device_enable_guest_msi(kvm, dev, irq);
 401                 break;
 402 #endif
 403 #ifdef __KVM_HAVE_MSIX
 404         case KVM_DEV_IRQ_GUEST_MSIX:
 405                 r = assigned_device_enable_guest_msix(kvm, dev, irq);
 406                 break;
 407 #endif
 408         default:
 409                 r = -EINVAL;
 410         }
 411
 412         if (!r) {
 413                 dev->irq_requested_type |= guest_irq_type;
 414                 if (dev->ack_notifier.gsi != -1)
 415                         kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier);
 416         } else
 417                 kvm_free_irq_source_id(kvm, dev->irq_source_id);
 418
 419         return r;
 420 }
 421
 422 /* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
 423 static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
 424                                    struct kvm_assigned_irq *assigned_irq)
 425 {
 426         int r = -EINVAL;
 427         struct kvm_assigned_dev_kernel *match;
 428         unsigned long host_irq_type, guest_irq_type;
 429
 430         if (!irqchip_in_kernel(kvm))
 431                 return r;
 432
 433         mutex_lock(&kvm->lock);
 434         r = -ENODEV;
 435         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 436                                       assigned_irq->assigned_dev_id);
 437         if (!match)
 438                 goto out;
 439
 440         host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK);
 441         guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK);
 442
 443         r = -EINVAL;
 444         /* can only assign one type at a time */
 445         if (hweight_long(host_irq_type) > 1)
 446                 goto out;
 447         if (hweight_long(guest_irq_type) > 1)
 448                 goto out;
 449         if (host_irq_type == 0 && guest_irq_type == 0)
 450                 goto out;
 451
 452         r = 0;
 453         if (host_irq_type)
 454                 r = assign_host_irq(kvm, match, host_irq_type);
 455         if (r)
 456                 goto out;
 457
 458         if (guest_irq_type)
 459                 r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type);
 460 out:
 461         mutex_unlock(&kvm->lock);
 462         return r;
 463 }
 464
 465 static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
 466                                          struct kvm_assigned_irq
 467                                          *assigned_irq)
 468 {
 469         int r = -ENODEV;
 470         struct kvm_assigned_dev_kernel *match;
 471
 472         mutex_lock(&kvm->lock);
 473
 474         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 475                                       assigned_irq->assigned_dev_id);
 476         if (!match)
 477                 goto out;
 478
 479         r = kvm_deassign_irq(kvm, match, assigned_irq->flags);
 480 out:
 481         mutex_unlock(&kvm->lock);
 482         return r;
 483 }
 484
 485 /*
 486  * We want to test whether the caller has been granted permissions to
 487  * use this device.  To be able to configure and control the device,
 488  * the user needs access to PCI configuration space and BAR resources.
 489  * These are accessed through PCI sysfs.  PCI config space is often
 490  * passed to the process calling this ioctl via file descriptor, so we
 491  * can't rely on access to that file.  We can check for permissions
 492  * on each of the BAR resource files, which is a pretty clear
 493  * indicator that the user has been granted access to the device.
 494  */
 495 static int probe_sysfs_permissions(struct pci_dev *dev)
 496 {
 497 #ifdef CONFIG_SYSFS
 498         int i;
 499         bool bar_found = false;
 500
 501         for (i = PCI_STD_RESOURCES; i <= PCI_STD_RESOURCE_END; i++) {
 502                 char *kpath, *syspath;
 503                 struct path path;
 504                 struct inode *inode;
 505                 int r;
 506
 507                 if (!pci_resource_len(dev, i))
 508                         continue;
 509
 510                 kpath = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
 511                 if (!kpath)
 512                         return -ENOMEM;
 513
 514                 /* Per sysfs-rules, sysfs is always at /sys */
 515                 syspath = kasprintf(GFP_KERNEL, "/sys%s/resource%d", kpath, i);
 516                 kfree(kpath);
 517                 if (!syspath)
 518                         return -ENOMEM;
 519
 520                 r = kern_path(syspath, LOOKUP_FOLLOW, &path);
 521                 kfree(syspath);
 522                 if (r)
 523                         return r;
 524
 525                 inode = path.dentry->d_inode;
 526
 527                 r = inode_permission(inode, MAY_READ | MAY_WRITE | MAY_ACCESS);
 528                 path_put(&path);
 529                 if (r)
 530                         return r;
 531
 532                 bar_found = true;
 533         }
 534
 535         /* If no resources, probably something special */
 536         if (!bar_found)
 537                 return -EPERM;
 538
 539         return 0;
 540 #else
 541         return -EINVAL; /* No way to control the device without sysfs */
 542 #endif
 543 }
 544
 545 static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
 546                                       struct kvm_assigned_pci_dev *assigned_dev)
 547 {
 548         int r = 0, idx;
 549         struct kvm_assigned_dev_kernel *match;
 550         struct pci_dev *dev;
 551         u8 header_type;
 552
 553         if (!(assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU))
 554                 return -EINVAL;
 555
 556         mutex_lock(&kvm->lock);
 557         idx = srcu_read_lock(&kvm->srcu);
 558
 559         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 560                                       assigned_dev->assigned_dev_id);
 561         if (match) {
 562                 /* device already assigned */
 563                 r = -EEXIST;
 564                 goto out;
 565         }
 566
 567         match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
 568         if (match == NULL) {
 569                 printk(KERN_INFO "%s: Couldn't allocate memory\n",
 570                        __func__);
 571                 r = -ENOMEM;
 572                 goto out;
 573         }
 574         dev = pci_get_domain_bus_and_slot(assigned_dev->segnr,
 575                                    assigned_dev->busnr,
 576                                    assigned_dev->devfn);
 577         if (!dev) {
 578                 printk(KERN_INFO "%s: host device not found\n", __func__);
 579                 r = -EINVAL;
 580                 goto out_free;
 581         }
 582
 583         /* Don't allow bridges to be assigned */
 584         pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
 585         if ((header_type & PCI_HEADER_TYPE) != PCI_HEADER_TYPE_NORMAL) {
 586                 r = -EPERM;
 587                 goto out_put;
 588         }
 589
 590         r = probe_sysfs_permissions(dev);
 591         if (r)
 592                 goto out_put;
 593
 594         if (pci_enable_device(dev)) {
 595                 printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
 596                 r = -EBUSY;
 597                 goto out_put;
 598         }
 599         r = pci_request_regions(dev, "kvm_assigned_device");
 600         if (r) {
 601                 printk(KERN_INFO "%s: Could not get access to device regions\n",
 602                        __func__);
 603                 goto out_disable;
 604         }
 605
 606         pci_reset_function(dev);
 607         pci_save_state(dev);
 608         match->pci_saved_state = pci_store_saved_state(dev);
 609         if (!match->pci_saved_state)
 610                 printk(KERN_DEBUG "%s: Couldn't store %s saved state\n",
 611                        __func__, dev_name(&dev->dev));
 612         match->assigned_dev_id = assigned_dev->assigned_dev_id;
 613         match->host_segnr = assigned_dev->segnr;
 614         match->host_busnr = assigned_dev->busnr;
 615         match->host_devfn = assigned_dev->devfn;
 616         match->flags = assigned_dev->flags;
 617         match->dev = dev;
 618         spin_lock_init(&match->intx_lock);
 619         match->irq_source_id = -1;
 620         match->kvm = kvm;
 621         match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
 622
 623         list_add(&match->list, &kvm->arch.assigned_dev_head);
 624
 625         if (!kvm->arch.iommu_domain) {
 626                 r = kvm_iommu_map_guest(kvm);
 627                 if (r)
 628                         goto out_list_del;
 629         }
 630         r = kvm_assign_device(kvm, match);
 631         if (r)
 632                 goto out_list_del;
 633
 634 out:
 635         srcu_read_unlock(&kvm->srcu, idx);
 636         mutex_unlock(&kvm->lock);
 637         return r;
 638 out_list_del:
 639         if (pci_load_and_free_saved_state(dev, &match->pci_saved_state))
 640                 printk(KERN_INFO "%s: Couldn't reload %s saved state\n",
 641                        __func__, dev_name(&dev->dev));
 642         list_del(&match->list);
 643         pci_release_regions(dev);
 644 out_disable:
 645         pci_disable_device(dev);
 646 out_put:
 647         pci_dev_put(dev);
 648 out_free:
 649         kfree(match);
 650         srcu_read_unlock(&kvm->srcu, idx);
 651         mutex_unlock(&kvm->lock);
 652         return r;
 653 }
 654
 655 static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
 656                 struct kvm_assigned_pci_dev *assigned_dev)
 657 {
 658         int r = 0;
 659         struct kvm_assigned_dev_kernel *match;
 660
 661         mutex_lock(&kvm->lock);
 662
 663         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 664                                       assigned_dev->assigned_dev_id);
 665         if (!match) {
 666                 printk(KERN_INFO "%s: device hasn't been assigned before, "
 667                   "so cannot be deassigned\n", __func__);
 668                 r = -EINVAL;
 669                 goto out;
 670         }
 671
 672         kvm_deassign_device(kvm, match);
 673
 674         kvm_free_assigned_device(kvm, match);
 675
 676 out:
 677         mutex_unlock(&kvm->lock);
 678         return r;
 679 }
 680
 681
 682 #ifdef __KVM_HAVE_MSIX
 683 static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
 684                                     struct kvm_assigned_msix_nr *entry_nr)
 685 {
 686         int r = 0;
 687         struct kvm_assigned_dev_kernel *adev;
 688
 689         mutex_lock(&kvm->lock);
 690
 691         adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 692                                       entry_nr->assigned_dev_id);
 693         if (!adev) {
 694                 r = -EINVAL;
 695                 goto msix_nr_out;
 696         }
 697
 698         if (adev->entries_nr == 0) {
 699                 adev->entries_nr = entry_nr->entry_nr;
 700                 if (adev->entries_nr == 0 ||
 701                     adev->entries_nr > KVM_MAX_MSIX_PER_DEV) {
 702                         r = -EINVAL;
 703                         goto msix_nr_out;
 704                 }
 705
 706                 adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) *
 707                                                 entry_nr->entry_nr,
 708                                                 GFP_KERNEL);
 709                 if (!adev->host_msix_entries) {
 710                         r = -ENOMEM;
 711                         goto msix_nr_out;
 712                 }
 713                 adev->guest_msix_entries =
 714                         kzalloc(sizeof(struct msix_entry) * entry_nr->entry_nr,
 715                                 GFP_KERNEL);
 716                 if (!adev->guest_msix_entries) {
 717                         kfree(adev->host_msix_entries);
 718                         r = -ENOMEM;
 719                         goto msix_nr_out;
 720                 }
 721         } else /* Not allowed set MSI-X number twice */
 722                 r = -EINVAL;
 723 msix_nr_out:
 724         mutex_unlock(&kvm->lock);
 725         return r;
 726 }
 727
 728 static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm,
 729                                        struct kvm_assigned_msix_entry *entry)
 730 {
 731         int r = 0, i;
 732         struct kvm_assigned_dev_kernel *adev;
 733
 734         mutex_lock(&kvm->lock);
 735
 736         adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 737                                       entry->assigned_dev_id);
 738
 739         if (!adev) {
 740                 r = -EINVAL;
 741                 goto msix_entry_out;
 742         }
 743
 744         for (i = 0; i < adev->entries_nr; i++)
 745                 if (adev->guest_msix_entries[i].vector == 0 ||
 746                     adev->guest_msix_entries[i].entry == entry->entry) {
 747                         adev->guest_msix_entries[i].entry = entry->entry;
 748                         adev->guest_msix_entries[i].vector = entry->gsi;
 749                         adev->host_msix_entries[i].entry = entry->entry;
 750                         break;
 751                 }
 752         if (i == adev->entries_nr) {
 753                 r = -ENOSPC;
 754                 goto msix_entry_out;
 755         }
 756
 757 msix_entry_out:
 758         mutex_unlock(&kvm->lock);
 759
 760         return r;
 761 }
 762 #endif
 763
 764 long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 765                                   unsigned long arg)
 766 {
 767         void __user *argp = (void __user *)arg;
 768         int r;
 769
 770         switch (ioctl) {
 771         case KVM_ASSIGN_PCI_DEVICE: {
 772                 struct kvm_assigned_pci_dev assigned_dev;
 773
 774                 r = -EFAULT;
 775                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
 776                         goto out;
 777                 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
 778                 if (r)
 779                         goto out;
 780                 break;
 781         }
 782         case KVM_ASSIGN_IRQ: {
 783                 r = -EOPNOTSUPP;
 784                 break;
 785         }
 786         case KVM_ASSIGN_DEV_IRQ: {
 787                 struct kvm_assigned_irq assigned_irq;
 788
 789                 r = -EFAULT;
 790                 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
 791                         goto out;
 792                 r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
 793                 if (r)
 794                         goto out;
 795                 break;
 796         }
 797         case KVM_DEASSIGN_DEV_IRQ: {
 798                 struct kvm_assigned_irq assigned_irq;
 799
 800                 r = -EFAULT;
 801                 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
 802                         goto out;
 803                 r = kvm_vm_ioctl_deassign_dev_irq(kvm, &assigned_irq);
 804                 if (r)
 805                         goto out;
 806                 break;
 807         }
 808         case KVM_DEASSIGN_PCI_DEVICE: {
 809                 struct kvm_assigned_pci_dev assigned_dev;
 810
 811                 r = -EFAULT;
 812                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
 813                         goto out;
 814                 r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
 815                 if (r)
 816                         goto out;
 817                 break;
 818         }
 819 #ifdef KVM_CAP_IRQ_ROUTING
 820         case KVM_SET_GSI_ROUTING: {
 821                 struct kvm_irq_routing routing;
 822                 struct kvm_irq_routing __user *urouting;
 823                 struct kvm_irq_routing_entry *entries;
 824
 825                 r = -EFAULT;
 826                 if (copy_from_user(&routing, argp, sizeof(routing)))
 827                         goto out;
 828                 r = -EINVAL;
 829                 if (routing.nr >= KVM_MAX_IRQ_ROUTES)
 830                         goto out;
 831                 if (routing.flags)
 832                         goto out;
 833                 r = -ENOMEM;
 834                 entries = vmalloc(routing.nr * sizeof(*entries));
 835                 if (!entries)
 836                         goto out;
 837                 r = -EFAULT;
 838                 urouting = argp;
 839                 if (copy_from_user(entries, urouting->entries,
 840                                    routing.nr * sizeof(*entries)))
 841                         goto out_free_irq_routing;
 842                 r = kvm_set_irq_routing(kvm, entries, routing.nr,
 843                                         routing.flags);
 844         out_free_irq_routing:
 845                 vfree(entries);
 846                 break;
 847         }
 848 #endif /* KVM_CAP_IRQ_ROUTING */
 849 #ifdef __KVM_HAVE_MSIX
 850         case KVM_ASSIGN_SET_MSIX_NR: {
 851                 struct kvm_assigned_msix_nr entry_nr;
 852                 r = -EFAULT;
 853                 if (copy_from_user(&entry_nr, argp, sizeof entry_nr))
 854                         goto out;
 855                 r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr);
 856                 if (r)
 857                         goto out;
 858                 break;
 859         }
 860         case KVM_ASSIGN_SET_MSIX_ENTRY: {
 861                 struct kvm_assigned_msix_entry entry;
 862                 r = -EFAULT;
 863                 if (copy_from_user(&entry, argp, sizeof entry))
 864                         goto out;
 865                 r = kvm_vm_ioctl_set_msix_entry(kvm, &entry);
 866                 if (r)
 867                         goto out;
 868                 break;
 869         }
 870 #endif
 871         default:
 872                 r = -ENOTTY;
 873                 break;
 874         }
 875 out:
 876         return r;
 877 }
 878