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         assigned_dev->dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
 209
 210         pci_release_regions(assigned_dev->dev);
 211         pci_disable_device(assigned_dev->dev);
 212         pci_dev_put(assigned_dev->dev);
 213
 214         list_del(&assigned_dev->list);
 215         kfree(assigned_dev);
 216 }
 217
 218 void kvm_free_all_assigned_devices(struct kvm *kvm)
 219 {
 220         struct list_head *ptr, *ptr2;
 221         struct kvm_assigned_dev_kernel *assigned_dev;
 222
 223         list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
 224                 assigned_dev = list_entry(ptr,
 225                                           struct kvm_assigned_dev_kernel,
 226                                           list);
 227
 228                 kvm_free_assigned_device(kvm, assigned_dev);
 229         }
 230 }
 231
 232 static int assigned_device_enable_host_intx(struct kvm *kvm,
 233                                             struct kvm_assigned_dev_kernel *dev)
 234 {
 235         dev->host_irq = dev->dev->irq;
 236         /* Even though this is PCI, we don't want to use shared
 237          * interrupts. Sharing host devices with guest-assigned devices
 238          * on the same interrupt line is not a happy situation: there
 239          * are going to be long delays in accepting, acking, etc.
 240          */
 241         if (request_threaded_irq(dev->host_irq, NULL, kvm_assigned_dev_thread,
 242                                  IRQF_ONESHOT, dev->irq_name, (void *)dev))
 243                 return -EIO;
 244         return 0;
 245 }
 246
 247 #ifdef __KVM_HAVE_MSI
 248 static int assigned_device_enable_host_msi(struct kvm *kvm,
 249                                            struct kvm_assigned_dev_kernel *dev)
 250 {
 251         int r;
 252
 253         if (!dev->dev->msi_enabled) {
 254                 r = pci_enable_msi(dev->dev);
 255                 if (r)
 256                         return r;
 257         }
 258
 259         dev->host_irq = dev->dev->irq;
 260         if (request_threaded_irq(dev->host_irq, NULL, kvm_assigned_dev_thread,
 261                                  0, dev->irq_name, (void *)dev)) {
 262                 pci_disable_msi(dev->dev);
 263                 return -EIO;
 264         }
 265
 266         return 0;
 267 }
 268 #endif
 269
 270 #ifdef __KVM_HAVE_MSIX
 271 static int assigned_device_enable_host_msix(struct kvm *kvm,
 272                                             struct kvm_assigned_dev_kernel *dev)
 273 {
 274         int i, r = -EINVAL;
 275
 276         /* host_msix_entries and guest_msix_entries should have been
 277          * initialized */
 278         if (dev->entries_nr == 0)
 279                 return r;
 280
 281         r = pci_enable_msix(dev->dev, dev->host_msix_entries, dev->entries_nr);
 282         if (r)
 283                 return r;
 284
 285         for (i = 0; i < dev->entries_nr; i++) {
 286                 r = request_threaded_irq(dev->host_msix_entries[i].vector,
 287                                          NULL, kvm_assigned_dev_thread,
 288                                          0, dev->irq_name, (void *)dev);
 289                 if (r)
 290                         goto err;
 291         }
 292
 293         return 0;
 294 err:
 295         for (i -= 1; i >= 0; i--)
 296                 free_irq(dev->host_msix_entries[i].vector, (void *)dev);
 297         pci_disable_msix(dev->dev);
 298         return r;
 299 }
 300
 301 #endif
 302
 303 static int assigned_device_enable_guest_intx(struct kvm *kvm,
 304                                 struct kvm_assigned_dev_kernel *dev,
 305                                 struct kvm_assigned_irq *irq)
 306 {
 307         dev->guest_irq = irq->guest_irq;
 308         dev->ack_notifier.gsi = irq->guest_irq;
 309         return 0;
 310 }
 311
 312 #ifdef __KVM_HAVE_MSI
 313 static int assigned_device_enable_guest_msi(struct kvm *kvm,
 314                         struct kvm_assigned_dev_kernel *dev,
 315                         struct kvm_assigned_irq *irq)
 316 {
 317         dev->guest_irq = irq->guest_irq;
 318         dev->ack_notifier.gsi = -1;
 319         dev->host_irq_disabled = false;
 320         return 0;
 321 }
 322 #endif
 323
 324 #ifdef __KVM_HAVE_MSIX
 325 static int assigned_device_enable_guest_msix(struct kvm *kvm,
 326                         struct kvm_assigned_dev_kernel *dev,
 327                         struct kvm_assigned_irq *irq)
 328 {
 329         dev->guest_irq = irq->guest_irq;
 330         dev->ack_notifier.gsi = -1;
 331         dev->host_irq_disabled = false;
 332         return 0;
 333 }
 334 #endif
 335
 336 static int assign_host_irq(struct kvm *kvm,
 337                            struct kvm_assigned_dev_kernel *dev,
 338                            __u32 host_irq_type)
 339 {
 340         int r = -EEXIST;
 341
 342         if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_MASK)
 343                 return r;
 344
 345         snprintf(dev->irq_name, sizeof(dev->irq_name), "kvm:%s",
 346                  pci_name(dev->dev));
 347
 348         switch (host_irq_type) {
 349         case KVM_DEV_IRQ_HOST_INTX:
 350                 r = assigned_device_enable_host_intx(kvm, dev);
 351                 break;
 352 #ifdef __KVM_HAVE_MSI
 353         case KVM_DEV_IRQ_HOST_MSI:
 354                 r = assigned_device_enable_host_msi(kvm, dev);
 355                 break;
 356 #endif
 357 #ifdef __KVM_HAVE_MSIX
 358         case KVM_DEV_IRQ_HOST_MSIX:
 359                 r = assigned_device_enable_host_msix(kvm, dev);
 360                 break;
 361 #endif
 362         default:
 363                 r = -EINVAL;
 364         }
 365
 366         if (!r)
 367                 dev->irq_requested_type |= host_irq_type;
 368
 369         return r;
 370 }
 371
 372 static int assign_guest_irq(struct kvm *kvm,
 373                             struct kvm_assigned_dev_kernel *dev,
 374                             struct kvm_assigned_irq *irq,
 375                             unsigned long guest_irq_type)
 376 {
 377         int id;
 378         int r = -EEXIST;
 379
 380         if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK)
 381                 return r;
 382
 383         id = kvm_request_irq_source_id(kvm);
 384         if (id < 0)
 385                 return id;
 386
 387         dev->irq_source_id = id;
 388
 389         switch (guest_irq_type) {
 390         case KVM_DEV_IRQ_GUEST_INTX:
 391                 r = assigned_device_enable_guest_intx(kvm, dev, irq);
 392                 break;
 393 #ifdef __KVM_HAVE_MSI
 394         case KVM_DEV_IRQ_GUEST_MSI:
 395                 r = assigned_device_enable_guest_msi(kvm, dev, irq);
 396                 break;
 397 #endif
 398 #ifdef __KVM_HAVE_MSIX
 399         case KVM_DEV_IRQ_GUEST_MSIX:
 400                 r = assigned_device_enable_guest_msix(kvm, dev, irq);
 401                 break;
 402 #endif
 403         default:
 404                 r = -EINVAL;
 405         }
 406
 407         if (!r) {
 408                 dev->irq_requested_type |= guest_irq_type;
 409                 kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier);
 410         } else
 411                 kvm_free_irq_source_id(kvm, dev->irq_source_id);
 412
 413         return r;
 414 }
 415
 416 /* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
 417 static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
 418                                    struct kvm_assigned_irq *assigned_irq)
 419 {
 420         int r = -EINVAL;
 421         struct kvm_assigned_dev_kernel *match;
 422         unsigned long host_irq_type, guest_irq_type;
 423
 424         if (!irqchip_in_kernel(kvm))
 425                 return r;
 426
 427         mutex_lock(&kvm->lock);
 428         r = -ENODEV;
 429         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 430                                       assigned_irq->assigned_dev_id);
 431         if (!match)
 432                 goto out;
 433
 434         host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK);
 435         guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK);
 436
 437         r = -EINVAL;
 438         /* can only assign one type at a time */
 439         if (hweight_long(host_irq_type) > 1)
 440                 goto out;
 441         if (hweight_long(guest_irq_type) > 1)
 442                 goto out;
 443         if (host_irq_type == 0 && guest_irq_type == 0)
 444                 goto out;
 445
 446         r = 0;
 447         if (host_irq_type)
 448                 r = assign_host_irq(kvm, match, host_irq_type);
 449         if (r)
 450                 goto out;
 451
 452         if (guest_irq_type)
 453                 r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type);
 454 out:
 455         mutex_unlock(&kvm->lock);
 456         return r;
 457 }
 458
 459 static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
 460                                          struct kvm_assigned_irq
 461                                          *assigned_irq)
 462 {
 463         int r = -ENODEV;
 464         struct kvm_assigned_dev_kernel *match;
 465
 466         mutex_lock(&kvm->lock);
 467
 468         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 469                                       assigned_irq->assigned_dev_id);
 470         if (!match)
 471                 goto out;
 472
 473         r = kvm_deassign_irq(kvm, match, assigned_irq->flags);
 474 out:
 475         mutex_unlock(&kvm->lock);
 476         return r;
 477 }
 478
 479 static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
 480                                       struct kvm_assigned_pci_dev *assigned_dev)
 481 {
 482         int r = 0, idx;
 483         struct kvm_assigned_dev_kernel *match;
 484         struct pci_dev *dev;
 485
 486         mutex_lock(&kvm->lock);
 487         idx = srcu_read_lock(&kvm->srcu);
 488
 489         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 490                                       assigned_dev->assigned_dev_id);
 491         if (match) {
 492                 /* device already assigned */
 493                 r = -EEXIST;
 494                 goto out;
 495         }
 496
 497         match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
 498         if (match == NULL) {
 499                 printk(KERN_INFO "%s: Couldn't allocate memory\n",
 500                        __func__);
 501                 r = -ENOMEM;
 502                 goto out;
 503         }
 504         dev = pci_get_domain_bus_and_slot(assigned_dev->segnr,
 505                                    assigned_dev->busnr,
 506                                    assigned_dev->devfn);
 507         if (!dev) {
 508                 printk(KERN_INFO "%s: host device not found\n", __func__);
 509                 r = -EINVAL;
 510                 goto out_free;
 511         }
 512         if (pci_enable_device(dev)) {
 513                 printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
 514                 r = -EBUSY;
 515                 goto out_put;
 516         }
 517         r = pci_request_regions(dev, "kvm_assigned_device");
 518         if (r) {
 519                 printk(KERN_INFO "%s: Could not get access to device regions\n",
 520                        __func__);
 521                 goto out_disable;
 522         }
 523
 524         pci_reset_function(dev);
 525         pci_save_state(dev);
 526         match->pci_saved_state = pci_store_saved_state(dev);
 527         if (!match->pci_saved_state)
 528                 printk(KERN_DEBUG "%s: Couldn't store %s saved state\n",
 529                        __func__, dev_name(&dev->dev));
 530         match->assigned_dev_id = assigned_dev->assigned_dev_id;
 531         match->host_segnr = assigned_dev->segnr;
 532         match->host_busnr = assigned_dev->busnr;
 533         match->host_devfn = assigned_dev->devfn;
 534         match->flags = assigned_dev->flags;
 535         match->dev = dev;
 536         spin_lock_init(&match->intx_lock);
 537         match->irq_source_id = -1;
 538         match->kvm = kvm;
 539         match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
 540
 541         list_add(&match->list, &kvm->arch.assigned_dev_head);
 542
 543         if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
 544                 if (!kvm->arch.iommu_domain) {
 545                         r = kvm_iommu_map_guest(kvm);
 546                         if (r)
 547                                 goto out_list_del;
 548                 }
 549                 r = kvm_assign_device(kvm, match);
 550                 if (r)
 551                         goto out_list_del;
 552         }
 553
 554 out:
 555         srcu_read_unlock(&kvm->srcu, idx);
 556         mutex_unlock(&kvm->lock);
 557         return r;
 558 out_list_del:
 559         if (pci_load_and_free_saved_state(dev, &match->pci_saved_state))
 560                 printk(KERN_INFO "%s: Couldn't reload %s saved state\n",
 561                        __func__, dev_name(&dev->dev));
 562         list_del(&match->list);
 563         pci_release_regions(dev);
 564 out_disable:
 565         pci_disable_device(dev);
 566 out_put:
 567         pci_dev_put(dev);
 568 out_free:
 569         kfree(match);
 570         srcu_read_unlock(&kvm->srcu, idx);
 571         mutex_unlock(&kvm->lock);
 572         return r;
 573 }
 574
 575 static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
 576                 struct kvm_assigned_pci_dev *assigned_dev)
 577 {
 578         int r = 0;
 579         struct kvm_assigned_dev_kernel *match;
 580
 581         mutex_lock(&kvm->lock);
 582
 583         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 584                                       assigned_dev->assigned_dev_id);
 585         if (!match) {
 586                 printk(KERN_INFO "%s: device hasn't been assigned before, "
 587                   "so cannot be deassigned\n", __func__);
 588                 r = -EINVAL;
 589                 goto out;
 590         }
 591
 592         if (match->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU)
 593                 kvm_deassign_device(kvm, match);
 594
 595         kvm_free_assigned_device(kvm, match);
 596
 597 out:
 598         mutex_unlock(&kvm->lock);
 599         return r;
 600 }
 601
 602
 603 #ifdef __KVM_HAVE_MSIX
 604 static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
 605                                     struct kvm_assigned_msix_nr *entry_nr)
 606 {
 607         int r = 0;
 608         struct kvm_assigned_dev_kernel *adev;
 609
 610         mutex_lock(&kvm->lock);
 611
 612         adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 613                                       entry_nr->assigned_dev_id);
 614         if (!adev) {
 615                 r = -EINVAL;
 616                 goto msix_nr_out;
 617         }
 618
 619         if (adev->entries_nr == 0) {
 620                 adev->entries_nr = entry_nr->entry_nr;
 621                 if (adev->entries_nr == 0 ||
 622                     adev->entries_nr > KVM_MAX_MSIX_PER_DEV) {
 623                         r = -EINVAL;
 624                         goto msix_nr_out;
 625                 }
 626
 627                 adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) *
 628                                                 entry_nr->entry_nr,
 629                                                 GFP_KERNEL);
 630                 if (!adev->host_msix_entries) {
 631                         r = -ENOMEM;
 632                         goto msix_nr_out;
 633                 }
 634                 adev->guest_msix_entries =
 635                         kzalloc(sizeof(struct msix_entry) * entry_nr->entry_nr,
 636                                 GFP_KERNEL);
 637                 if (!adev->guest_msix_entries) {
 638                         kfree(adev->host_msix_entries);
 639                         r = -ENOMEM;
 640                         goto msix_nr_out;
 641                 }
 642         } else /* Not allowed set MSI-X number twice */
 643                 r = -EINVAL;
 644 msix_nr_out:
 645         mutex_unlock(&kvm->lock);
 646         return r;
 647 }
 648
 649 static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm,
 650                                        struct kvm_assigned_msix_entry *entry)
 651 {
 652         int r = 0, i;
 653         struct kvm_assigned_dev_kernel *adev;
 654
 655         mutex_lock(&kvm->lock);
 656
 657         adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 658                                       entry->assigned_dev_id);
 659
 660         if (!adev) {
 661                 r = -EINVAL;
 662                 goto msix_entry_out;
 663         }
 664
 665         for (i = 0; i < adev->entries_nr; i++)
 666                 if (adev->guest_msix_entries[i].vector == 0 ||
 667                     adev->guest_msix_entries[i].entry == entry->entry) {
 668                         adev->guest_msix_entries[i].entry = entry->entry;
 669                         adev->guest_msix_entries[i].vector = entry->gsi;
 670                         adev->host_msix_entries[i].entry = entry->entry;
 671                         break;
 672                 }
 673         if (i == adev->entries_nr) {
 674                 r = -ENOSPC;
 675                 goto msix_entry_out;
 676         }
 677
 678 msix_entry_out:
 679         mutex_unlock(&kvm->lock);
 680
 681         return r;
 682 }
 683 #endif
 684
 685 long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 686                                   unsigned long arg)
 687 {
 688         void __user *argp = (void __user *)arg;
 689         int r;
 690
 691         switch (ioctl) {
 692         case KVM_ASSIGN_PCI_DEVICE: {
 693                 struct kvm_assigned_pci_dev assigned_dev;
 694
 695                 r = -EFAULT;
 696                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
 697                         goto out;
 698                 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
 699                 if (r)
 700                         goto out;
 701                 break;
 702         }
 703         case KVM_ASSIGN_IRQ: {
 704                 r = -EOPNOTSUPP;
 705                 break;
 706         }
 707         case KVM_ASSIGN_DEV_IRQ: {
 708                 struct kvm_assigned_irq assigned_irq;
 709
 710                 r = -EFAULT;
 711                 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
 712                         goto out;
 713                 r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
 714                 if (r)
 715                         goto out;
 716                 break;
 717         }
 718         case KVM_DEASSIGN_DEV_IRQ: {
 719                 struct kvm_assigned_irq assigned_irq;
 720
 721                 r = -EFAULT;
 722                 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
 723                         goto out;
 724                 r = kvm_vm_ioctl_deassign_dev_irq(kvm, &assigned_irq);
 725                 if (r)
 726                         goto out;
 727                 break;
 728         }
 729         case KVM_DEASSIGN_PCI_DEVICE: {
 730                 struct kvm_assigned_pci_dev assigned_dev;
 731
 732                 r = -EFAULT;
 733                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
 734                         goto out;
 735                 r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
 736                 if (r)
 737                         goto out;
 738                 break;
 739         }
 740 #ifdef KVM_CAP_IRQ_ROUTING
 741         case KVM_SET_GSI_ROUTING: {
 742                 struct kvm_irq_routing routing;
 743                 struct kvm_irq_routing __user *urouting;
 744                 struct kvm_irq_routing_entry *entries;
 745
 746                 r = -EFAULT;
 747                 if (copy_from_user(&routing, argp, sizeof(routing)))
 748                         goto out;
 749                 r = -EINVAL;
 750                 if (routing.nr >= KVM_MAX_IRQ_ROUTES)
 751                         goto out;
 752                 if (routing.flags)
 753                         goto out;
 754                 r = -ENOMEM;
 755                 entries = vmalloc(routing.nr * sizeof(*entries));
 756                 if (!entries)
 757                         goto out;
 758                 r = -EFAULT;
 759                 urouting = argp;
 760                 if (copy_from_user(entries, urouting->entries,
 761                                    routing.nr * sizeof(*entries)))
 762                         goto out_free_irq_routing;
 763                 r = kvm_set_irq_routing(kvm, entries, routing.nr,
 764                                         routing.flags);
 765         out_free_irq_routing:
 766                 vfree(entries);
 767                 break;
 768         }
 769 #endif /* KVM_CAP_IRQ_ROUTING */
 770 #ifdef __KVM_HAVE_MSIX
 771         case KVM_ASSIGN_SET_MSIX_NR: {
 772                 struct kvm_assigned_msix_nr entry_nr;
 773                 r = -EFAULT;
 774                 if (copy_from_user(&entry_nr, argp, sizeof entry_nr))
 775                         goto out;
 776                 r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr);
 777                 if (r)
 778                         goto out;
 779                 break;
 780         }
 781         case KVM_ASSIGN_SET_MSIX_ENTRY: {
 782                 struct kvm_assigned_msix_entry entry;
 783                 r = -EFAULT;
 784                 if (copy_from_user(&entry, argp, sizeof entry))
 785                         goto out;
 786                 r = kvm_vm_ioctl_set_msix_entry(kvm, &entry);
 787                 if (r)
 788                         goto out;
 789                 break;
 790         }
 791 #endif
 792         default:
 793                 r = -ENOTTY;
 794                 break;
 795         }
 796 out:
 797         return r;
 798 }
 799