virt/kvm/kvm_main.c

   1 /*
   2  * Kernel-based Virtual Machine driver for Linux
   3  *
   4  * This module enables machines with Intel VT-x extensions to run virtual
   5  * machines without emulation or binary translation.
   6  *
   7  * Copyright (C) 2006 Qumranet, Inc.
   8  *
   9  * Authors:
  10  *   Avi Kivity   <avi@qumranet.com>
  11  *   Yaniv Kamay  <yaniv@qumranet.com>
  12  *
  13  * This work is licensed under the terms of the GNU GPL, version 2.  See
  14  * the COPYING file in the top-level directory.
  15  *
  16  */
  17
  18 #include "iodev.h"
  19
  20 #include <linux/kvm_host.h>
  21 #include <linux/kvm.h>
  22 #include <linux/module.h>
  23 #include <linux/errno.h>
  24 #include <linux/percpu.h>
  25 #include <linux/gfp.h>
  26 #include <linux/mm.h>
  27 #include <linux/miscdevice.h>
  28 #include <linux/vmalloc.h>
  29 #include <linux/reboot.h>
  30 #include <linux/debugfs.h>
  31 #include <linux/highmem.h>
  32 #include <linux/file.h>
  33 #include <linux/sysdev.h>
  34 #include <linux/cpu.h>
  35 #include <linux/sched.h>
  36 #include <linux/cpumask.h>
  37 #include <linux/smp.h>
  38 #include <linux/anon_inodes.h>
  39 #include <linux/profile.h>
  40 #include <linux/kvm_para.h>
  41 #include <linux/pagemap.h>
  42 #include <linux/mman.h>
  43 #include <linux/swap.h>
  44
  45 #include <asm/processor.h>
  46 #include <asm/io.h>
  47 #include <asm/uaccess.h>
  48 #include <asm/pgtable.h>
  49
  50 #ifdef CONFIG_X86
  51 #include <asm/msidef.h>
  52 #endif
  53
  54 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
  55 #include "coalesced_mmio.h"
  56 #endif
  57
  58 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
  59 #include <linux/pci.h>
  60 #include <linux/interrupt.h>
  61 #include "irq.h"
  62 #endif
  63
  64 MODULE_AUTHOR("Qumranet");
  65 MODULE_LICENSE("GPL");
  66
  67 static int msi2intx = 1;
  68 module_param(msi2intx, bool, 0);
  69
  70 DEFINE_SPINLOCK(kvm_lock);
  71 LIST_HEAD(vm_list);
  72
  73 static cpumask_var_t cpus_hardware_enabled;
  74
  75 struct kmem_cache *kvm_vcpu_cache;
  76 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
  77
  78 static __read_mostly struct preempt_ops kvm_preempt_ops;
  79
  80 struct dentry *kvm_debugfs_dir;
  81
  82 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
  83                            unsigned long arg);
  84
  85 static bool kvm_rebooting;
  86
  87 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
  88
  89 #ifdef CONFIG_X86
  90 static void assigned_device_msi_dispatch(struct kvm_assigned_dev_kernel *dev)
  91 {
  92         int vcpu_id;
  93         struct kvm_vcpu *vcpu;
  94         struct kvm_ioapic *ioapic = ioapic_irqchip(dev->kvm);
  95         int dest_id = (dev->guest_msi.address_lo & MSI_ADDR_DEST_ID_MASK)
  96                         >> MSI_ADDR_DEST_ID_SHIFT;
  97         int vector = (dev->guest_msi.data & MSI_DATA_VECTOR_MASK)
  98                         >> MSI_DATA_VECTOR_SHIFT;
  99         int dest_mode = test_bit(MSI_ADDR_DEST_MODE_SHIFT,
 100                                 (unsigned long *)&dev->guest_msi.address_lo);
 101         int trig_mode = test_bit(MSI_DATA_TRIGGER_SHIFT,
 102                                 (unsigned long *)&dev->guest_msi.data);
 103         int delivery_mode = test_bit(MSI_DATA_DELIVERY_MODE_SHIFT,
 104                                 (unsigned long *)&dev->guest_msi.data);
 105         u32 deliver_bitmask;
 106
 107         BUG_ON(!ioapic);
 108
 109         deliver_bitmask = kvm_ioapic_get_delivery_bitmask(ioapic,
 110                                 dest_id, dest_mode);
 111         /* IOAPIC delivery mode value is the same as MSI here */
 112         switch (delivery_mode) {
 113         case IOAPIC_LOWEST_PRIORITY:
 114                 vcpu = kvm_get_lowest_prio_vcpu(ioapic->kvm, vector,
 115                                 deliver_bitmask);
 116                 if (vcpu != NULL)
 117                         kvm_apic_set_irq(vcpu, vector, trig_mode);
 118                 else
 119                         printk(KERN_INFO "kvm: null lowest priority vcpu!\n");
 120                 break;
 121         case IOAPIC_FIXED:
 122                 for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
 123                         if (!(deliver_bitmask & (1 << vcpu_id)))
 124                                 continue;
 125                         deliver_bitmask &= ~(1 << vcpu_id);
 126                         vcpu = ioapic->kvm->vcpus[vcpu_id];
 127                         if (vcpu)
 128                                 kvm_apic_set_irq(vcpu, vector, trig_mode);
 129                 }
 130                 break;
 131         default:
 132                 printk(KERN_INFO "kvm: unsupported MSI delivery mode\n");
 133         }
 134 }
 135 #else
 136 static void assigned_device_msi_dispatch(struct kvm_assigned_dev_kernel *dev) {}
 137 #endif
 138
 139 static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head *head,
 140                                                       int assigned_dev_id)
 141 {
 142         struct list_head *ptr;
 143         struct kvm_assigned_dev_kernel *match;
 144
 145         list_for_each(ptr, head) {
 146                 match = list_entry(ptr, struct kvm_assigned_dev_kernel, list);
 147                 if (match->assigned_dev_id == assigned_dev_id)
 148                         return match;
 149         }
 150         return NULL;
 151 }
 152
 153 static void kvm_assigned_dev_interrupt_work_handler(struct work_struct *work)
 154 {
 155         struct kvm_assigned_dev_kernel *assigned_dev;
 156
 157         assigned_dev = container_of(work, struct kvm_assigned_dev_kernel,
 158                                     interrupt_work);
 159
 160         /* This is taken to safely inject irq inside the guest. When
 161          * the interrupt injection (or the ioapic code) uses a
 162          * finer-grained lock, update this
 163          */
 164         mutex_lock(&assigned_dev->kvm->lock);
 165         if (assigned_dev->irq_requested_type & KVM_ASSIGNED_DEV_GUEST_INTX)
 166                 kvm_set_irq(assigned_dev->kvm,
 167                             assigned_dev->irq_source_id,
 168                             assigned_dev->guest_irq, 1);
 169         else if (assigned_dev->irq_requested_type &
 170                                 KVM_ASSIGNED_DEV_GUEST_MSI) {
 171                 assigned_device_msi_dispatch(assigned_dev);
 172                 enable_irq(assigned_dev->host_irq);
 173                 assigned_dev->host_irq_disabled = false;
 174         }
 175         mutex_unlock(&assigned_dev->kvm->lock);
 176         kvm_put_kvm(assigned_dev->kvm);
 177 }
 178
 179 static irqreturn_t kvm_assigned_dev_intr(int irq, void *dev_id)
 180 {
 181         struct kvm_assigned_dev_kernel *assigned_dev =
 182                 (struct kvm_assigned_dev_kernel *) dev_id;
 183
 184         kvm_get_kvm(assigned_dev->kvm);
 185
 186         schedule_work(&assigned_dev->interrupt_work);
 187
 188         disable_irq_nosync(irq);
 189         assigned_dev->host_irq_disabled = true;
 190
 191         return IRQ_HANDLED;
 192 }
 193
 194 /* Ack the irq line for an assigned device */
 195 static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
 196 {
 197         struct kvm_assigned_dev_kernel *dev;
 198
 199         if (kian->gsi == -1)
 200                 return;
 201
 202         dev = container_of(kian, struct kvm_assigned_dev_kernel,
 203                            ack_notifier);
 204
 205         kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0);
 206
 207         /* The guest irq may be shared so this ack may be
 208          * from another device.
 209          */
 210         if (dev->host_irq_disabled) {
 211                 enable_irq(dev->host_irq);
 212                 dev->host_irq_disabled = false;
 213         }
 214 }
 215
 216 static void kvm_free_assigned_irq(struct kvm *kvm,
 217                                   struct kvm_assigned_dev_kernel *assigned_dev)
 218 {
 219         if (!irqchip_in_kernel(kvm))
 220                 return;
 221
 222         kvm_unregister_irq_ack_notifier(&assigned_dev->ack_notifier);
 223
 224         if (assigned_dev->irq_source_id != -1)
 225                 kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
 226         assigned_dev->irq_source_id = -1;
 227
 228         if (!assigned_dev->irq_requested_type)
 229                 return;
 230
 231         if (cancel_work_sync(&assigned_dev->interrupt_work))
 232                 /* We had pending work. That means we will have to take
 233                  * care of kvm_put_kvm.
 234                  */
 235                 kvm_put_kvm(kvm);
 236
 237         free_irq(assigned_dev->host_irq, (void *)assigned_dev);
 238
 239         if (assigned_dev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI)
 240                 pci_disable_msi(assigned_dev->dev);
 241
 242         assigned_dev->irq_requested_type = 0;
 243 }
 244
 245
 246 static void kvm_free_assigned_device(struct kvm *kvm,
 247                                      struct kvm_assigned_dev_kernel
 248                                      *assigned_dev)
 249 {
 250         kvm_free_assigned_irq(kvm, assigned_dev);
 251
 252         pci_reset_function(assigned_dev->dev);
 253
 254         pci_release_regions(assigned_dev->dev);
 255         pci_disable_device(assigned_dev->dev);
 256         pci_dev_put(assigned_dev->dev);
 257
 258         list_del(&assigned_dev->list);
 259         kfree(assigned_dev);
 260 }
 261
 262 void kvm_free_all_assigned_devices(struct kvm *kvm)
 263 {
 264         struct list_head *ptr, *ptr2;
 265         struct kvm_assigned_dev_kernel *assigned_dev;
 266
 267         list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
 268                 assigned_dev = list_entry(ptr,
 269                                           struct kvm_assigned_dev_kernel,
 270                                           list);
 271
 272                 kvm_free_assigned_device(kvm, assigned_dev);
 273         }
 274 }
 275
 276 static int assigned_device_update_intx(struct kvm *kvm,
 277                         struct kvm_assigned_dev_kernel *adev,
 278                         struct kvm_assigned_irq *airq)
 279 {
 280         adev->guest_irq = airq->guest_irq;
 281         adev->ack_notifier.gsi = airq->guest_irq;
 282
 283         if (adev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_INTX)
 284                 return 0;
 285
 286         if (irqchip_in_kernel(kvm)) {
 287                 if (!msi2intx &&
 288                     adev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI) {
 289                         free_irq(adev->host_irq, (void *)kvm);
 290                         pci_disable_msi(adev->dev);
 291                 }
 292
 293                 if (!capable(CAP_SYS_RAWIO))
 294                         return -EPERM;
 295
 296                 if (airq->host_irq)
 297                         adev->host_irq = airq->host_irq;
 298                 else
 299                         adev->host_irq = adev->dev->irq;
 300
 301                 /* Even though this is PCI, we don't want to use shared
 302                  * interrupts. Sharing host devices with guest-assigned devices
 303                  * on the same interrupt line is not a happy situation: there
 304                  * are going to be long delays in accepting, acking, etc.
 305                  */
 306                 if (request_irq(adev->host_irq, kvm_assigned_dev_intr,
 307                                 0, "kvm_assigned_intx_device", (void *)adev))
 308                         return -EIO;
 309         }
 310
 311         adev->irq_requested_type = KVM_ASSIGNED_DEV_GUEST_INTX |
 312                                    KVM_ASSIGNED_DEV_HOST_INTX;
 313         return 0;
 314 }
 315
 316 #ifdef CONFIG_X86
 317 static int assigned_device_update_msi(struct kvm *kvm,
 318                         struct kvm_assigned_dev_kernel *adev,
 319                         struct kvm_assigned_irq *airq)
 320 {
 321         int r;
 322
 323         if (airq->flags & KVM_DEV_IRQ_ASSIGN_ENABLE_MSI) {
 324                 /* x86 don't care upper address of guest msi message addr */
 325                 adev->irq_requested_type |= KVM_ASSIGNED_DEV_GUEST_MSI;
 326                 adev->irq_requested_type &= ~KVM_ASSIGNED_DEV_GUEST_INTX;
 327                 adev->guest_msi.address_lo = airq->guest_msi.addr_lo;
 328                 adev->guest_msi.data = airq->guest_msi.data;
 329                 adev->ack_notifier.gsi = -1;
 330         } else if (msi2intx) {
 331                 adev->irq_requested_type |= KVM_ASSIGNED_DEV_GUEST_INTX;
 332                 adev->irq_requested_type &= ~KVM_ASSIGNED_DEV_GUEST_MSI;
 333                 adev->guest_irq = airq->guest_irq;
 334                 adev->ack_notifier.gsi = airq->guest_irq;
 335         }
 336
 337         if (adev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI)
 338                 return 0;
 339
 340         if (irqchip_in_kernel(kvm)) {
 341                 if (!msi2intx) {
 342                         if (adev->irq_requested_type &
 343                                         KVM_ASSIGNED_DEV_HOST_INTX)
 344                                 free_irq(adev->host_irq, (void *)adev);
 345
 346                         r = pci_enable_msi(adev->dev);
 347                         if (r)
 348                                 return r;
 349                 }
 350
 351                 adev->host_irq = adev->dev->irq;
 352                 if (request_irq(adev->host_irq, kvm_assigned_dev_intr, 0,
 353                                 "kvm_assigned_msi_device", (void *)adev))
 354                         return -EIO;
 355         }
 356
 357         if (!msi2intx)
 358                 adev->irq_requested_type = KVM_ASSIGNED_DEV_GUEST_MSI;
 359
 360         adev->irq_requested_type |= KVM_ASSIGNED_DEV_HOST_MSI;
 361         return 0;
 362 }
 363 #endif
 364
 365 static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
 366                                    struct kvm_assigned_irq
 367                                    *assigned_irq)
 368 {
 369         int r = 0;
 370         struct kvm_assigned_dev_kernel *match;
 371
 372         mutex_lock(&kvm->lock);
 373
 374         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 375                                       assigned_irq->assigned_dev_id);
 376         if (!match) {
 377                 mutex_unlock(&kvm->lock);
 378                 return -EINVAL;
 379         }
 380
 381         if (!match->irq_requested_type) {
 382                 INIT_WORK(&match->interrupt_work,
 383                                 kvm_assigned_dev_interrupt_work_handler);
 384                 if (irqchip_in_kernel(kvm)) {
 385                         /* Register ack nofitier */
 386                         match->ack_notifier.gsi = -1;
 387                         match->ack_notifier.irq_acked =
 388                                         kvm_assigned_dev_ack_irq;
 389                         kvm_register_irq_ack_notifier(kvm,
 390                                         &match->ack_notifier);
 391
 392                         /* Request IRQ source ID */
 393                         r = kvm_request_irq_source_id(kvm);
 394                         if (r < 0)
 395                                 goto out_release;
 396                         else
 397                                 match->irq_source_id = r;
 398
 399 #ifdef CONFIG_X86
 400                         /* Determine host device irq type, we can know the
 401                          * result from dev->msi_enabled */
 402                         if (msi2intx)
 403                                 pci_enable_msi(match->dev);
 404 #endif
 405                 }
 406         }
 407
 408         if ((!msi2intx &&
 409              (assigned_irq->flags & KVM_DEV_IRQ_ASSIGN_ENABLE_MSI)) ||
 410             (msi2intx && match->dev->msi_enabled)) {
 411 #ifdef CONFIG_X86
 412                 r = assigned_device_update_msi(kvm, match, assigned_irq);
 413                 if (r) {
 414                         printk(KERN_WARNING "kvm: failed to enable "
 415                                         "MSI device!\n");
 416                         goto out_release;
 417                 }
 418 #else
 419                 r = -ENOTTY;
 420 #endif
 421         } else if (assigned_irq->host_irq == 0 && match->dev->irq == 0) {
 422                 /* Host device IRQ 0 means don't support INTx */
 423                 if (!msi2intx) {
 424                         printk(KERN_WARNING
 425                                "kvm: wait device to enable MSI!\n");
 426                         r = 0;
 427                 } else {
 428                         printk(KERN_WARNING
 429                                "kvm: failed to enable MSI device!\n");
 430                         r = -ENOTTY;
 431                         goto out_release;
 432                 }
 433         } else {
 434                 /* Non-sharing INTx mode */
 435                 r = assigned_device_update_intx(kvm, match, assigned_irq);
 436                 if (r) {
 437                         printk(KERN_WARNING "kvm: failed to enable "
 438                                         "INTx device!\n");
 439                         goto out_release;
 440                 }
 441         }
 442
 443         mutex_unlock(&kvm->lock);
 444         return r;
 445 out_release:
 446         mutex_unlock(&kvm->lock);
 447         kvm_free_assigned_device(kvm, match);
 448         return r;
 449 }
 450
 451 static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
 452                                       struct kvm_assigned_pci_dev *assigned_dev)
 453 {
 454         int r = 0;
 455         struct kvm_assigned_dev_kernel *match;
 456         struct pci_dev *dev;
 457
 458         mutex_lock(&kvm->lock);
 459
 460         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 461                                       assigned_dev->assigned_dev_id);
 462         if (match) {
 463                 /* device already assigned */
 464                 r = -EINVAL;
 465                 goto out;
 466         }
 467
 468         match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
 469         if (match == NULL) {
 470                 printk(KERN_INFO "%s: Couldn't allocate memory\n",
 471                        __func__);
 472                 r = -ENOMEM;
 473                 goto out;
 474         }
 475         dev = pci_get_bus_and_slot(assigned_dev->busnr,
 476                                    assigned_dev->devfn);
 477         if (!dev) {
 478                 printk(KERN_INFO "%s: host device not found\n", __func__);
 479                 r = -EINVAL;
 480                 goto out_free;
 481         }
 482         if (pci_enable_device(dev)) {
 483                 printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
 484                 r = -EBUSY;
 485                 goto out_put;
 486         }
 487         r = pci_request_regions(dev, "kvm_assigned_device");
 488         if (r) {
 489                 printk(KERN_INFO "%s: Could not get access to device regions\n",
 490                        __func__);
 491                 goto out_disable;
 492         }
 493
 494         pci_reset_function(dev);
 495
 496         match->assigned_dev_id = assigned_dev->assigned_dev_id;
 497         match->host_busnr = assigned_dev->busnr;
 498         match->host_devfn = assigned_dev->devfn;
 499         match->flags = assigned_dev->flags;
 500         match->dev = dev;
 501         match->irq_source_id = -1;
 502         match->kvm = kvm;
 503
 504         list_add(&match->list, &kvm->arch.assigned_dev_head);
 505
 506         if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
 507                 if (!kvm->arch.iommu_domain) {
 508                         r = kvm_iommu_map_guest(kvm);
 509                         if (r)
 510                                 goto out_list_del;
 511                 }
 512                 r = kvm_assign_device(kvm, match);
 513                 if (r)
 514                         goto out_list_del;
 515         }
 516
 517 out:
 518         mutex_unlock(&kvm->lock);
 519         return r;
 520 out_list_del:
 521         list_del(&match->list);
 522         pci_release_regions(dev);
 523 out_disable:
 524         pci_disable_device(dev);
 525 out_put:
 526         pci_dev_put(dev);
 527 out_free:
 528         kfree(match);
 529         mutex_unlock(&kvm->lock);
 530         return r;
 531 }
 532 #endif
 533
 534 #ifdef KVM_CAP_DEVICE_DEASSIGNMENT
 535 static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
 536                 struct kvm_assigned_pci_dev *assigned_dev)
 537 {
 538         int r = 0;
 539         struct kvm_assigned_dev_kernel *match;
 540
 541         mutex_lock(&kvm->lock);
 542
 543         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 544                                       assigned_dev->assigned_dev_id);
 545         if (!match) {
 546                 printk(KERN_INFO "%s: device hasn't been assigned before, "
 547                   "so cannot be deassigned\n", __func__);
 548                 r = -EINVAL;
 549                 goto out;
 550         }
 551
 552         if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU)
 553                 kvm_deassign_device(kvm, match);
 554
 555         kvm_free_assigned_device(kvm, match);
 556
 557 out:
 558         mutex_unlock(&kvm->lock);
 559         return r;
 560 }
 561 #endif
 562
 563 static inline int valid_vcpu(int n)
 564 {
 565         return likely(n >= 0 && n < KVM_MAX_VCPUS);
 566 }
 567
 568 inline int kvm_is_mmio_pfn(pfn_t pfn)
 569 {
 570         if (pfn_valid(pfn))
 571                 return PageReserved(pfn_to_page(pfn));
 572
 573         return true;
 574 }
 575
 576 /*
 577  * Switches to specified vcpu, until a matching vcpu_put()
 578  */
 579 void vcpu_load(struct kvm_vcpu *vcpu)
 580 {
 581         int cpu;
 582
 583         mutex_lock(&vcpu->mutex);
 584         cpu = get_cpu();
 585         preempt_notifier_register(&vcpu->preempt_notifier);
 586         kvm_arch_vcpu_load(vcpu, cpu);
 587         put_cpu();
 588 }
 589
 590 void vcpu_put(struct kvm_vcpu *vcpu)
 591 {
 592         preempt_disable();
 593         kvm_arch_vcpu_put(vcpu);
 594         preempt_notifier_unregister(&vcpu->preempt_notifier);
 595         preempt_enable();
 596         mutex_unlock(&vcpu->mutex);
 597 }
 598
 599 static void ack_flush(void *_completed)
 600 {
 601 }
 602
 603 static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
 604 {
 605         int i, cpu, me;
 606         cpumask_var_t cpus;
 607         bool called = true;
 608         struct kvm_vcpu *vcpu;
 609
 610         if (alloc_cpumask_var(&cpus, GFP_ATOMIC))
 611                 cpumask_clear(cpus);
 612
 613         me = get_cpu();
 614         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 615                 vcpu = kvm->vcpus[i];
 616                 if (!vcpu)
 617                         continue;
 618                 if (test_and_set_bit(req, &vcpu->requests))
 619                         continue;
 620                 cpu = vcpu->cpu;
 621                 if (cpus != NULL && cpu != -1 && cpu != me)
 622                         cpumask_set_cpu(cpu, cpus);
 623         }
 624         if (unlikely(cpus == NULL))
 625                 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
 626         else if (!cpumask_empty(cpus))
 627                 smp_call_function_many(cpus, ack_flush, NULL, 1);
 628         else
 629                 called = false;
 630         put_cpu();
 631         free_cpumask_var(cpus);
 632         return called;
 633 }
 634
 635 void kvm_flush_remote_tlbs(struct kvm *kvm)
 636 {
 637         if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
 638                 ++kvm->stat.remote_tlb_flush;
 639 }
 640
 641 void kvm_reload_remote_mmus(struct kvm *kvm)
 642 {
 643         make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
 644 }
 645
 646 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 647 {
 648         struct page *page;
 649         int r;
 650
 651         mutex_init(&vcpu->mutex);
 652         vcpu->cpu = -1;
 653         vcpu->kvm = kvm;
 654         vcpu->vcpu_id = id;
 655         init_waitqueue_head(&vcpu->wq);
 656
 657         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 658         if (!page) {
 659                 r = -ENOMEM;
 660                 goto fail;
 661         }
 662         vcpu->run = page_address(page);
 663
 664         r = kvm_arch_vcpu_init(vcpu);
 665         if (r < 0)
 666                 goto fail_free_run;
 667         return 0;
 668
 669 fail_free_run:
 670         free_page((unsigned long)vcpu->run);
 671 fail:
 672         return r;
 673 }
 674 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
 675
 676 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
 677 {
 678         kvm_arch_vcpu_uninit(vcpu);
 679         free_page((unsigned long)vcpu->run);
 680 }
 681 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
 682
 683 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 684 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
 685 {
 686         return container_of(mn, struct kvm, mmu_notifier);
 687 }
 688
 689 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
 690                                              struct mm_struct *mm,
 691                                              unsigned long address)
 692 {
 693         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 694         int need_tlb_flush;
 695
 696         /*
 697          * When ->invalidate_page runs, the linux pte has been zapped
 698          * already but the page is still allocated until
 699          * ->invalidate_page returns. So if we increase the sequence
 700          * here the kvm page fault will notice if the spte can't be
 701          * established because the page is going to be freed. If
 702          * instead the kvm page fault establishes the spte before
 703          * ->invalidate_page runs, kvm_unmap_hva will release it
 704          * before returning.
 705          *
 706          * The sequence increase only need to be seen at spin_unlock
 707          * time, and not at spin_lock time.
 708          *
 709          * Increasing the sequence after the spin_unlock would be
 710          * unsafe because the kvm page fault could then establish the
 711          * pte after kvm_unmap_hva returned, without noticing the page
 712          * is going to be freed.
 713          */
 714         spin_lock(&kvm->mmu_lock);
 715         kvm->mmu_notifier_seq++;
 716         need_tlb_flush = kvm_unmap_hva(kvm, address);
 717         spin_unlock(&kvm->mmu_lock);
 718
 719         /* we've to flush the tlb before the pages can be freed */
 720         if (need_tlb_flush)
 721                 kvm_flush_remote_tlbs(kvm);
 722
 723 }
 724
 725 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
 726                                                     struct mm_struct *mm,
 727                                                     unsigned long start,
 728                                                     unsigned long end)
 729 {
 730         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 731         int need_tlb_flush = 0;
 732
 733         spin_lock(&kvm->mmu_lock);
 734         /*
 735          * The count increase must become visible at unlock time as no
 736          * spte can be established without taking the mmu_lock and
 737          * count is also read inside the mmu_lock critical section.
 738          */
 739         kvm->mmu_notifier_count++;
 740         for (; start < end; start += PAGE_SIZE)
 741                 need_tlb_flush |= kvm_unmap_hva(kvm, start);
 742         spin_unlock(&kvm->mmu_lock);
 743
 744         /* we've to flush the tlb before the pages can be freed */
 745         if (need_tlb_flush)
 746                 kvm_flush_remote_tlbs(kvm);
 747 }
 748
 749 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
 750                                                   struct mm_struct *mm,
 751                                                   unsigned long start,
 752                                                   unsigned long end)
 753 {
 754         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 755
 756         spin_lock(&kvm->mmu_lock);
 757         /*
 758          * This sequence increase will notify the kvm page fault that
 759          * the page that is going to be mapped in the spte could have
 760          * been freed.
 761          */
 762         kvm->mmu_notifier_seq++;
 763         /*
 764          * The above sequence increase must be visible before the
 765          * below count decrease but both values are read by the kvm
 766          * page fault under mmu_lock spinlock so we don't need to add
 767          * a smb_wmb() here in between the two.
 768          */
 769         kvm->mmu_notifier_count--;
 770         spin_unlock(&kvm->mmu_lock);
 771
 772         BUG_ON(kvm->mmu_notifier_count < 0);
 773 }
 774
 775 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
 776                                               struct mm_struct *mm,
 777                                               unsigned long address)
 778 {
 779         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 780         int young;
 781
 782         spin_lock(&kvm->mmu_lock);
 783         young = kvm_age_hva(kvm, address);
 784         spin_unlock(&kvm->mmu_lock);
 785
 786         if (young)
 787                 kvm_flush_remote_tlbs(kvm);
 788
 789         return young;
 790 }
 791
 792 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
 793                                      struct mm_struct *mm)
 794 {
 795         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 796         kvm_arch_flush_shadow(kvm);
 797 }
 798
 799 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
 800         .invalidate_page        = kvm_mmu_notifier_invalidate_page,
 801         .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
 802         .invalidate_range_end   = kvm_mmu_notifier_invalidate_range_end,
 803         .clear_flush_young      = kvm_mmu_notifier_clear_flush_young,
 804         .release                = kvm_mmu_notifier_release,
 805 };
 806 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
 807
 808 static struct kvm *kvm_create_vm(void)
 809 {
 810         struct kvm *kvm = kvm_arch_create_vm();
 811 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 812         struct page *page;
 813 #endif
 814
 815         if (IS_ERR(kvm))
 816                 goto out;
 817
 818 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 819         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 820         if (!page) {
 821                 kfree(kvm);
 822                 return ERR_PTR(-ENOMEM);
 823         }
 824         kvm->coalesced_mmio_ring =
 825                         (struct kvm_coalesced_mmio_ring *)page_address(page);
 826 #endif
 827
 828 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 829         {
 830                 int err;
 831                 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
 832                 err = mmu_notifier_register(&kvm->mmu_notifier, current->mm);
 833                 if (err) {
 834 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 835                         put_page(page);
 836 #endif
 837                         kfree(kvm);
 838                         return ERR_PTR(err);
 839                 }
 840         }
 841 #endif
 842
 843         kvm->mm = current->mm;
 844         atomic_inc(&kvm->mm->mm_count);
 845         spin_lock_init(&kvm->mmu_lock);
 846         kvm_io_bus_init(&kvm->pio_bus);
 847         mutex_init(&kvm->lock);
 848         kvm_io_bus_init(&kvm->mmio_bus);
 849         init_rwsem(&kvm->slots_lock);
 850         atomic_set(&kvm->users_count, 1);
 851         spin_lock(&kvm_lock);
 852         list_add(&kvm->vm_list, &vm_list);
 853         spin_unlock(&kvm_lock);
 854 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 855         kvm_coalesced_mmio_init(kvm);
 856 #endif
 857 out:
 858         return kvm;
 859 }
 860
 861 /*
 862  * Free any memory in @free but not in @dont.
 863  */
 864 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
 865                                   struct kvm_memory_slot *dont)
 866 {
 867         if (!dont || free->rmap != dont->rmap)
 868                 vfree(free->rmap);
 869
 870         if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
 871                 vfree(free->dirty_bitmap);
 872
 873         if (!dont || free->lpage_info != dont->lpage_info)
 874                 vfree(free->lpage_info);
 875
 876         free->npages = 0;
 877         free->dirty_bitmap = NULL;
 878         free->rmap = NULL;
 879         free->lpage_info = NULL;
 880 }
 881
 882 void kvm_free_physmem(struct kvm *kvm)
 883 {
 884         int i;
 885
 886         for (i = 0; i < kvm->nmemslots; ++i)
 887                 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
 888 }
 889
 890 static void kvm_destroy_vm(struct kvm *kvm)
 891 {
 892         struct mm_struct *mm = kvm->mm;
 893
 894         spin_lock(&kvm_lock);
 895         list_del(&kvm->vm_list);
 896         spin_unlock(&kvm_lock);
 897         kvm_io_bus_destroy(&kvm->pio_bus);
 898         kvm_io_bus_destroy(&kvm->mmio_bus);
 899 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 900         if (kvm->coalesced_mmio_ring != NULL)
 901                 free_page((unsigned long)kvm->coalesced_mmio_ring);
 902 #endif
 903 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 904         mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
 905 #endif
 906         kvm_arch_destroy_vm(kvm);
 907         mmdrop(mm);
 908 }
 909
 910 void kvm_get_kvm(struct kvm *kvm)
 911 {
 912         atomic_inc(&kvm->users_count);
 913 }
 914 EXPORT_SYMBOL_GPL(kvm_get_kvm);
 915
 916 void kvm_put_kvm(struct kvm *kvm)
 917 {
 918         if (atomic_dec_and_test(&kvm->users_count))
 919                 kvm_destroy_vm(kvm);
 920 }
 921 EXPORT_SYMBOL_GPL(kvm_put_kvm);
 922
 923
 924 static int kvm_vm_release(struct inode *inode, struct file *filp)
 925 {
 926         struct kvm *kvm = filp->private_data;
 927
 928         kvm_put_kvm(kvm);
 929         return 0;
 930 }
 931
 932 /*
 933  * Allocate some memory and give it an address in the guest physical address
 934  * space.
 935  *
 936  * Discontiguous memory is allowed, mostly for framebuffers.
 937  *
 938  * Must be called holding mmap_sem for write.
 939  */
 940 int __kvm_set_memory_region(struct kvm *kvm,
 941                             struct kvm_userspace_memory_region *mem,
 942                             int user_alloc)
 943 {
 944         int r;
 945         gfn_t base_gfn;
 946         unsigned long npages;
 947         unsigned long i;
 948         struct kvm_memory_slot *memslot;
 949         struct kvm_memory_slot old, new;
 950
 951         r = -EINVAL;
 952         /* General sanity checks */
 953         if (mem->memory_size & (PAGE_SIZE - 1))
 954                 goto out;
 955         if (mem->guest_phys_addr & (PAGE_SIZE - 1))
 956                 goto out;
 957         if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1)))
 958                 goto out;
 959         if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
 960                 goto out;
 961         if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
 962                 goto out;
 963
 964         memslot = &kvm->memslots[mem->slot];
 965         base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
 966         npages = mem->memory_size >> PAGE_SHIFT;
 967
 968         if (!npages)
 969                 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
 970
 971         new = old = *memslot;
 972
 973         new.base_gfn = base_gfn;
 974         new.npages = npages;
 975         new.flags = mem->flags;
 976
 977         /* Disallow changing a memory slot's size. */
 978         r = -EINVAL;
 979         if (npages && old.npages && npages != old.npages)
 980                 goto out_free;
 981
 982         /* Check for overlaps */
 983         r = -EEXIST;
 984         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
 985                 struct kvm_memory_slot *s = &kvm->memslots[i];
 986
 987                 if (s == memslot)
 988                         continue;
 989                 if (!((base_gfn + npages <= s->base_gfn) ||
 990                       (base_gfn >= s->base_gfn + s->npages)))
 991                         goto out_free;
 992         }
 993
 994         /* Free page dirty bitmap if unneeded */
 995         if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
 996                 new.dirty_bitmap = NULL;
 997
 998         r = -ENOMEM;
 999
1000         /* Allocate if a slot is being created */
1001 #ifndef CONFIG_S390
1002         if (npages && !new.rmap) {
1003                 new.rmap = vmalloc(npages * sizeof(struct page *));
1004
1005                 if (!new.rmap)
1006                         goto out_free;
1007
1008                 memset(new.rmap, 0, npages * sizeof(*new.rmap));
1009
1010                 new.user_alloc = user_alloc;
1011                 /*
1012                  * hva_to_rmmap() serialzies with the mmu_lock and to be
1013                  * safe it has to ignore memslots with !user_alloc &&
1014                  * !userspace_addr.
1015                  */
1016                 if (user_alloc)
1017                         new.userspace_addr = mem->userspace_addr;
1018                 else
1019                         new.userspace_addr = 0;
1020         }
1021         if (npages && !new.lpage_info) {
1022                 int largepages = npages / KVM_PAGES_PER_HPAGE;
1023                 if (npages % KVM_PAGES_PER_HPAGE)
1024                         largepages++;
1025                 if (base_gfn % KVM_PAGES_PER_HPAGE)
1026                         largepages++;
1027
1028                 new.lpage_info = vmalloc(largepages * sizeof(*new.lpage_info));
1029
1030                 if (!new.lpage_info)
1031                         goto out_free;
1032
1033                 memset(new.lpage_info, 0, largepages * sizeof(*new.lpage_info));
1034
1035                 if (base_gfn % KVM_PAGES_PER_HPAGE)
1036                         new.lpage_info[0].write_count = 1;
1037                 if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE)
1038                         new.lpage_info[largepages-1].write_count = 1;
1039         }
1040
1041         /* Allocate page dirty bitmap if needed */
1042         if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
1043                 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
1044
1045                 new.dirty_bitmap = vmalloc(dirty_bytes);
1046                 if (!new.dirty_bitmap)
1047                         goto out_free;
1048                 memset(new.dirty_bitmap, 0, dirty_bytes);
1049         }
1050 #endif /* not defined CONFIG_S390 */
1051
1052         if (!npages)
1053                 kvm_arch_flush_shadow(kvm);
1054
1055         spin_lock(&kvm->mmu_lock);
1056         if (mem->slot >= kvm->nmemslots)
1057                 kvm->nmemslots = mem->slot + 1;
1058
1059         *memslot = new;
1060         spin_unlock(&kvm->mmu_lock);
1061
1062         r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc);
1063         if (r) {
1064                 spin_lock(&kvm->mmu_lock);
1065                 *memslot = old;
1066                 spin_unlock(&kvm->mmu_lock);
1067                 goto out_free;
1068         }
1069
1070         kvm_free_physmem_slot(&old, npages ? &new : NULL);
1071         /* Slot deletion case: we have to update the current slot */
1072         if (!npages)
1073                 *memslot = old;
1074 #ifdef CONFIG_DMAR
1075         /* map the pages in iommu page table */
1076         r = kvm_iommu_map_pages(kvm, base_gfn, npages);
1077         if (r)
1078                 goto out;
1079 #endif
1080         return 0;
1081
1082 out_free:
1083         kvm_free_physmem_slot(&new, &old);
1084 out:
1085         return r;
1086
1087 }
1088 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
1089
1090 int kvm_set_memory_region(struct kvm *kvm,
1091                           struct kvm_userspace_memory_region *mem,
1092                           int user_alloc)
1093 {
1094         int r;
1095
1096         down_write(&kvm->slots_lock);
1097         r = __kvm_set_memory_region(kvm, mem, user_alloc);
1098         up_write(&kvm->slots_lock);
1099         return r;
1100 }
1101 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
1102
1103 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
1104                                    struct
1105                                    kvm_userspace_memory_region *mem,
1106                                    int user_alloc)
1107 {
1108         if (mem->slot >= KVM_MEMORY_SLOTS)
1109                 return -EINVAL;
1110         return kvm_set_memory_region(kvm, mem, user_alloc);
1111 }
1112
1113 int kvm_get_dirty_log(struct kvm *kvm,
1114                         struct kvm_dirty_log *log, int *is_dirty)
1115 {
1116         struct kvm_memory_slot *memslot;
1117         int r, i;
1118         int n;
1119         unsigned long any = 0;
1120
1121         r = -EINVAL;
1122         if (log->slot >= KVM_MEMORY_SLOTS)
1123                 goto out;
1124
1125         memslot = &kvm->memslots[log->slot];
1126         r = -ENOENT;
1127         if (!memslot->dirty_bitmap)
1128                 goto out;
1129
1130         n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
1131
1132         for (i = 0; !any && i < n/sizeof(long); ++i)
1133                 any = memslot->dirty_bitmap[i];
1134
1135         r = -EFAULT;
1136         if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
1137                 goto out;
1138
1139         if (any)
1140                 *is_dirty = 1;
1141
1142         r = 0;
1143 out:
1144         return r;
1145 }
1146
1147 int is_error_page(struct page *page)
1148 {
1149         return page == bad_page;
1150 }
1151 EXPORT_SYMBOL_GPL(is_error_page);
1152
1153 int is_error_pfn(pfn_t pfn)
1154 {
1155         return pfn == bad_pfn;
1156 }
1157 EXPORT_SYMBOL_GPL(is_error_pfn);
1158
1159 static inline unsigned long bad_hva(void)
1160 {
1161         return PAGE_OFFSET;
1162 }
1163
1164 int kvm_is_error_hva(unsigned long addr)
1165 {
1166         return addr == bad_hva();
1167 }
1168 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
1169
1170 struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn)
1171 {
1172         int i;
1173
1174         for (i = 0; i < kvm->nmemslots; ++i) {
1175                 struct kvm_memory_slot *memslot = &kvm->memslots[i];
1176
1177                 if (gfn >= memslot->base_gfn
1178                     && gfn < memslot->base_gfn + memslot->npages)
1179                         return memslot;
1180         }
1181         return NULL;
1182 }
1183 EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased);
1184
1185 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
1186 {
1187         gfn = unalias_gfn(kvm, gfn);
1188         return gfn_to_memslot_unaliased(kvm, gfn);
1189 }
1190
1191 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
1192 {
1193         int i;
1194
1195         gfn = unalias_gfn(kvm, gfn);
1196         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
1197                 struct kvm_memory_slot *memslot = &kvm->memslots[i];
1198
1199                 if (gfn >= memslot->base_gfn
1200                     && gfn < memslot->base_gfn + memslot->npages)
1201                         return 1;
1202         }
1203         return 0;
1204 }
1205 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1206
1207 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1208 {
1209         struct kvm_memory_slot *slot;
1210
1211         gfn = unalias_gfn(kvm, gfn);
1212         slot = gfn_to_memslot_unaliased(kvm, gfn);
1213         if (!slot)
1214                 return bad_hva();
1215         return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
1216 }
1217 EXPORT_SYMBOL_GPL(gfn_to_hva);
1218
1219 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1220 {
1221         struct page *page[1];
1222         unsigned long addr;
1223         int npages;
1224         pfn_t pfn;
1225
1226         might_sleep();
1227
1228         addr = gfn_to_hva(kvm, gfn);
1229         if (kvm_is_error_hva(addr)) {
1230                 get_page(bad_page);
1231                 return page_to_pfn(bad_page);
1232         }
1233
1234         npages = get_user_pages_fast(addr, 1, 1, page);
1235
1236         if (unlikely(npages != 1)) {
1237                 struct vm_area_struct *vma;
1238
1239                 down_read(&current->mm->mmap_sem);
1240                 vma = find_vma(current->mm, addr);
1241
1242                 if (vma == NULL || addr < vma->vm_start ||
1243                     !(vma->vm_flags & VM_PFNMAP)) {
1244                         up_read(&current->mm->mmap_sem);
1245                         get_page(bad_page);
1246                         return page_to_pfn(bad_page);
1247                 }
1248
1249                 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1250                 up_read(&current->mm->mmap_sem);
1251                 BUG_ON(!kvm_is_mmio_pfn(pfn));
1252         } else
1253                 pfn = page_to_pfn(page[0]);
1254
1255         return pfn;
1256 }
1257
1258 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1259
1260 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1261 {
1262         pfn_t pfn;
1263
1264         pfn = gfn_to_pfn(kvm, gfn);
1265         if (!kvm_is_mmio_pfn(pfn))
1266                 return pfn_to_page(pfn);
1267
1268         WARN_ON(kvm_is_mmio_pfn(pfn));
1269
1270         get_page(bad_page);
1271         return bad_page;
1272 }
1273
1274 EXPORT_SYMBOL_GPL(gfn_to_page);
1275
1276 void kvm_release_page_clean(struct page *page)
1277 {
1278         kvm_release_pfn_clean(page_to_pfn(page));
1279 }
1280 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1281
1282 void kvm_release_pfn_clean(pfn_t pfn)
1283 {
1284         if (!kvm_is_mmio_pfn(pfn))
1285                 put_page(pfn_to_page(pfn));
1286 }
1287 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1288
1289 void kvm_release_page_dirty(struct page *page)
1290 {
1291         kvm_release_pfn_dirty(page_to_pfn(page));
1292 }
1293 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1294
1295 void kvm_release_pfn_dirty(pfn_t pfn)
1296 {
1297         kvm_set_pfn_dirty(pfn);
1298         kvm_release_pfn_clean(pfn);
1299 }
1300 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1301
1302 void kvm_set_page_dirty(struct page *page)
1303 {
1304         kvm_set_pfn_dirty(page_to_pfn(page));
1305 }
1306 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1307
1308 void kvm_set_pfn_dirty(pfn_t pfn)
1309 {
1310         if (!kvm_is_mmio_pfn(pfn)) {
1311                 struct page *page = pfn_to_page(pfn);
1312                 if (!PageReserved(page))
1313                         SetPageDirty(page);
1314         }
1315 }
1316 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1317
1318 void kvm_set_pfn_accessed(pfn_t pfn)
1319 {
1320         if (!kvm_is_mmio_pfn(pfn))
1321                 mark_page_accessed(pfn_to_page(pfn));
1322 }
1323 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1324
1325 void kvm_get_pfn(pfn_t pfn)
1326 {
1327         if (!kvm_is_mmio_pfn(pfn))
1328                 get_page(pfn_to_page(pfn));
1329 }
1330 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1331
1332 static int next_segment(unsigned long len, int offset)
1333 {
1334         if (len > PAGE_SIZE - offset)
1335                 return PAGE_SIZE - offset;
1336         else
1337                 return len;
1338 }
1339
1340 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1341                         int len)
1342 {
1343         int r;
1344         unsigned long addr;
1345
1346         addr = gfn_to_hva(kvm, gfn);
1347         if (kvm_is_error_hva(addr))
1348                 return -EFAULT;
1349         r = copy_from_user(data, (void __user *)addr + offset, len);
1350         if (r)
1351                 return -EFAULT;
1352         return 0;
1353 }
1354 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1355
1356 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1357 {
1358         gfn_t gfn = gpa >> PAGE_SHIFT;
1359         int seg;
1360         int offset = offset_in_page(gpa);
1361         int ret;
1362
1363         while ((seg = next_segment(len, offset)) != 0) {
1364                 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1365                 if (ret < 0)
1366                         return ret;
1367                 offset = 0;
1368                 len -= seg;
1369                 data += seg;
1370                 ++gfn;
1371         }
1372         return 0;
1373 }
1374 EXPORT_SYMBOL_GPL(kvm_read_guest);
1375
1376 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1377                           unsigned long len)
1378 {
1379         int r;
1380         unsigned long addr;
1381         gfn_t gfn = gpa >> PAGE_SHIFT;
1382         int offset = offset_in_page(gpa);
1383
1384         addr = gfn_to_hva(kvm, gfn);
1385         if (kvm_is_error_hva(addr))
1386                 return -EFAULT;
1387         pagefault_disable();
1388         r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1389         pagefault_enable();
1390         if (r)
1391                 return -EFAULT;
1392         return 0;
1393 }
1394 EXPORT_SYMBOL(kvm_read_guest_atomic);
1395
1396 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1397                          int offset, int len)
1398 {
1399         int r;
1400         unsigned long addr;
1401
1402         addr = gfn_to_hva(kvm, gfn);
1403         if (kvm_is_error_hva(addr))
1404                 return -EFAULT;
1405         r = copy_to_user((void __user *)addr + offset, data, len);
1406         if (r)
1407                 return -EFAULT;
1408         mark_page_dirty(kvm, gfn);
1409         return 0;
1410 }
1411 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1412
1413 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1414                     unsigned long len)
1415 {
1416         gfn_t gfn = gpa >> PAGE_SHIFT;
1417         int seg;
1418         int offset = offset_in_page(gpa);
1419         int ret;
1420
1421         while ((seg = next_segment(len, offset)) != 0) {
1422                 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1423                 if (ret < 0)
1424                         return ret;
1425                 offset = 0;
1426                 len -= seg;
1427                 data += seg;
1428                 ++gfn;
1429         }
1430         return 0;
1431 }
1432
1433 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1434 {
1435         return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
1436 }
1437 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1438
1439 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1440 {
1441         gfn_t gfn = gpa >> PAGE_SHIFT;
1442         int seg;
1443         int offset = offset_in_page(gpa);
1444         int ret;
1445
1446         while ((seg = next_segment(len, offset)) != 0) {
1447                 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1448                 if (ret < 0)
1449                         return ret;
1450                 offset = 0;
1451                 len -= seg;
1452                 ++gfn;
1453         }
1454         return 0;
1455 }
1456 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1457
1458 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1459 {
1460         struct kvm_memory_slot *memslot;
1461
1462         gfn = unalias_gfn(kvm, gfn);
1463         memslot = gfn_to_memslot_unaliased(kvm, gfn);
1464         if (memslot && memslot->dirty_bitmap) {
1465                 unsigned long rel_gfn = gfn - memslot->base_gfn;
1466
1467                 /* avoid RMW */
1468                 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
1469                         set_bit(rel_gfn, memslot->dirty_bitmap);
1470         }
1471 }
1472
1473 /*
1474  * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1475  */
1476 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1477 {
1478         DEFINE_WAIT(wait);
1479
1480         for (;;) {
1481                 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1482
1483                 if (kvm_cpu_has_interrupt(vcpu) ||
1484                     kvm_cpu_has_pending_timer(vcpu) ||
1485                     kvm_arch_vcpu_runnable(vcpu)) {
1486                         set_bit(KVM_REQ_UNHALT, &vcpu->requests);
1487                         break;
1488                 }
1489                 if (signal_pending(current))
1490                         break;
1491
1492                 vcpu_put(vcpu);
1493                 schedule();
1494                 vcpu_load(vcpu);
1495         }
1496
1497         finish_wait(&vcpu->wq, &wait);
1498 }
1499
1500 void kvm_resched(struct kvm_vcpu *vcpu)
1501 {
1502         if (!need_resched())
1503                 return;
1504         cond_resched();
1505 }
1506 EXPORT_SYMBOL_GPL(kvm_resched);
1507
1508 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1509 {
1510         struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1511         struct page *page;
1512
1513         if (vmf->pgoff == 0)
1514                 page = virt_to_page(vcpu->run);
1515 #ifdef CONFIG_X86
1516         else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1517                 page = virt_to_page(vcpu->arch.pio_data);
1518 #endif
1519 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1520         else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1521                 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1522 #endif
1523         else
1524                 return VM_FAULT_SIGBUS;
1525         get_page(page);
1526         vmf->page = page;
1527         return 0;
1528 }
1529
1530 static struct vm_operations_struct kvm_vcpu_vm_ops = {
1531         .fault = kvm_vcpu_fault,
1532 };
1533
1534 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1535 {
1536         vma->vm_ops = &kvm_vcpu_vm_ops;
1537         return 0;
1538 }
1539
1540 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1541 {
1542         struct kvm_vcpu *vcpu = filp->private_data;
1543
1544         kvm_put_kvm(vcpu->kvm);
1545         return 0;
1546 }
1547
1548 static struct file_operations kvm_vcpu_fops = {
1549         .release        = kvm_vcpu_release,
1550         .unlocked_ioctl = kvm_vcpu_ioctl,
1551         .compat_ioctl   = kvm_vcpu_ioctl,
1552         .mmap           = kvm_vcpu_mmap,
1553 };
1554
1555 /*
1556  * Allocates an inode for the vcpu.
1557  */
1558 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1559 {
1560         int fd = anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, 0);
1561         if (fd < 0)
1562                 kvm_put_kvm(vcpu->kvm);
1563         return fd;
1564 }
1565
1566 /*
1567  * Creates some virtual cpus.  Good luck creating more than one.
1568  */
1569 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
1570 {
1571         int r;
1572         struct kvm_vcpu *vcpu;
1573
1574         if (!valid_vcpu(n))
1575                 return -EINVAL;
1576
1577         vcpu = kvm_arch_vcpu_create(kvm, n);
1578         if (IS_ERR(vcpu))
1579                 return PTR_ERR(vcpu);
1580
1581         preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1582
1583         r = kvm_arch_vcpu_setup(vcpu);
1584         if (r)
1585                 return r;
1586
1587         mutex_lock(&kvm->lock);
1588         if (kvm->vcpus[n]) {
1589                 r = -EEXIST;
1590                 goto vcpu_destroy;
1591         }
1592         kvm->vcpus[n] = vcpu;
1593         mutex_unlock(&kvm->lock);
1594
1595         /* Now it's all set up, let userspace reach it */
1596         kvm_get_kvm(kvm);
1597         r = create_vcpu_fd(vcpu);
1598         if (r < 0)
1599                 goto unlink;
1600         return r;
1601
1602 unlink:
1603         mutex_lock(&kvm->lock);
1604         kvm->vcpus[n] = NULL;
1605 vcpu_destroy:
1606         mutex_unlock(&kvm->lock);
1607         kvm_arch_vcpu_destroy(vcpu);
1608         return r;
1609 }
1610
1611 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1612 {
1613         if (sigset) {
1614                 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1615                 vcpu->sigset_active = 1;
1616                 vcpu->sigset = *sigset;
1617         } else
1618                 vcpu->sigset_active = 0;
1619         return 0;
1620 }
1621
1622 static long kvm_vcpu_ioctl(struct file *filp,
1623                            unsigned int ioctl, unsigned long arg)
1624 {
1625         struct kvm_vcpu *vcpu = filp->private_data;
1626         void __user *argp = (void __user *)arg;
1627         int r;
1628         struct kvm_fpu *fpu = NULL;
1629         struct kvm_sregs *kvm_sregs = NULL;
1630
1631         if (vcpu->kvm->mm != current->mm)
1632                 return -EIO;
1633         switch (ioctl) {
1634         case KVM_RUN:
1635                 r = -EINVAL;
1636                 if (arg)
1637                         goto out;
1638                 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1639                 break;
1640         case KVM_GET_REGS: {
1641                 struct kvm_regs *kvm_regs;
1642
1643                 r = -ENOMEM;
1644                 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1645                 if (!kvm_regs)
1646                         goto out;
1647                 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1648                 if (r)
1649                         goto out_free1;
1650                 r = -EFAULT;
1651                 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1652                         goto out_free1;
1653                 r = 0;
1654 out_free1:
1655                 kfree(kvm_regs);
1656                 break;
1657         }
1658         case KVM_SET_REGS: {
1659                 struct kvm_regs *kvm_regs;
1660
1661                 r = -ENOMEM;
1662                 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1663                 if (!kvm_regs)
1664                         goto out;
1665                 r = -EFAULT;
1666                 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1667                         goto out_free2;
1668                 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1669                 if (r)
1670                         goto out_free2;
1671                 r = 0;
1672 out_free2:
1673                 kfree(kvm_regs);
1674                 break;
1675         }
1676         case KVM_GET_SREGS: {
1677                 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1678                 r = -ENOMEM;
1679                 if (!kvm_sregs)
1680                         goto out;
1681                 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1682                 if (r)
1683                         goto out;
1684                 r = -EFAULT;
1685                 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1686                         goto out;
1687                 r = 0;
1688                 break;
1689         }
1690         case KVM_SET_SREGS: {
1691                 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1692                 r = -ENOMEM;
1693                 if (!kvm_sregs)
1694                         goto out;
1695                 r = -EFAULT;
1696                 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1697                         goto out;
1698                 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1699                 if (r)
1700                         goto out;
1701                 r = 0;
1702                 break;
1703         }
1704         case KVM_GET_MP_STATE: {
1705                 struct kvm_mp_state mp_state;
1706
1707                 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1708                 if (r)
1709                         goto out;
1710                 r = -EFAULT;
1711                 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1712                         goto out;
1713                 r = 0;
1714                 break;
1715         }
1716         case KVM_SET_MP_STATE: {
1717                 struct kvm_mp_state mp_state;
1718
1719                 r = -EFAULT;
1720                 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1721                         goto out;
1722                 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1723                 if (r)
1724                         goto out;
1725                 r = 0;
1726                 break;
1727         }
1728         case KVM_TRANSLATE: {
1729                 struct kvm_translation tr;
1730
1731                 r = -EFAULT;
1732                 if (copy_from_user(&tr, argp, sizeof tr))
1733                         goto out;
1734                 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1735                 if (r)
1736                         goto out;
1737                 r = -EFAULT;
1738                 if (copy_to_user(argp, &tr, sizeof tr))
1739                         goto out;
1740                 r = 0;
1741                 break;
1742         }
1743         case KVM_DEBUG_GUEST: {
1744                 struct kvm_debug_guest dbg;
1745
1746                 r = -EFAULT;
1747                 if (copy_from_user(&dbg, argp, sizeof dbg))
1748                         goto out;
1749                 r = kvm_arch_vcpu_ioctl_debug_guest(vcpu, &dbg);
1750                 if (r)
1751                         goto out;
1752                 r = 0;
1753                 break;
1754         }
1755         case KVM_SET_SIGNAL_MASK: {
1756                 struct kvm_signal_mask __user *sigmask_arg = argp;
1757                 struct kvm_signal_mask kvm_sigmask;
1758                 sigset_t sigset, *p;
1759
1760                 p = NULL;
1761                 if (argp) {
1762                         r = -EFAULT;
1763                         if (copy_from_user(&kvm_sigmask, argp,
1764                                            sizeof kvm_sigmask))
1765                                 goto out;
1766                         r = -EINVAL;
1767                         if (kvm_sigmask.len != sizeof sigset)
1768                                 goto out;
1769                         r = -EFAULT;
1770                         if (copy_from_user(&sigset, sigmask_arg->sigset,
1771                                            sizeof sigset))
1772                                 goto out;
1773                         p = &sigset;
1774                 }
1775                 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1776                 break;
1777         }
1778         case KVM_GET_FPU: {
1779                 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1780                 r = -ENOMEM;
1781                 if (!fpu)
1782                         goto out;
1783                 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
1784                 if (r)
1785                         goto out;
1786                 r = -EFAULT;
1787                 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
1788                         goto out;
1789                 r = 0;
1790                 break;
1791         }
1792         case KVM_SET_FPU: {
1793                 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1794                 r = -ENOMEM;
1795                 if (!fpu)
1796                         goto out;
1797                 r = -EFAULT;
1798                 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
1799                         goto out;
1800                 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
1801                 if (r)
1802                         goto out;
1803                 r = 0;
1804                 break;
1805         }
1806         default:
1807                 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1808         }
1809 out:
1810         kfree(fpu);
1811         kfree(kvm_sregs);
1812         return r;
1813 }
1814
1815 static long kvm_vm_ioctl(struct file *filp,
1816                            unsigned int ioctl, unsigned long arg)
1817 {
1818         struct kvm *kvm = filp->private_data;
1819         void __user *argp = (void __user *)arg;
1820         int r;
1821
1822         if (kvm->mm != current->mm)
1823                 return -EIO;
1824         switch (ioctl) {
1825         case KVM_CREATE_VCPU:
1826                 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1827                 if (r < 0)
1828                         goto out;
1829                 break;
1830         case KVM_SET_USER_MEMORY_REGION: {
1831                 struct kvm_userspace_memory_region kvm_userspace_mem;
1832
1833                 r = -EFAULT;
1834                 if (copy_from_user(&kvm_userspace_mem, argp,
1835                                                 sizeof kvm_userspace_mem))
1836                         goto out;
1837
1838                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
1839                 if (r)
1840                         goto out;
1841                 break;
1842         }
1843         case KVM_GET_DIRTY_LOG: {
1844                 struct kvm_dirty_log log;
1845
1846                 r = -EFAULT;
1847                 if (copy_from_user(&log, argp, sizeof log))
1848                         goto out;
1849                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1850                 if (r)
1851                         goto out;
1852                 break;
1853         }
1854 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1855         case KVM_REGISTER_COALESCED_MMIO: {
1856                 struct kvm_coalesced_mmio_zone zone;
1857                 r = -EFAULT;
1858                 if (copy_from_user(&zone, argp, sizeof zone))
1859                         goto out;
1860                 r = -ENXIO;
1861                 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
1862                 if (r)
1863                         goto out;
1864                 r = 0;
1865                 break;
1866         }
1867         case KVM_UNREGISTER_COALESCED_MMIO: {
1868                 struct kvm_coalesced_mmio_zone zone;
1869                 r = -EFAULT;
1870                 if (copy_from_user(&zone, argp, sizeof zone))
1871                         goto out;
1872                 r = -ENXIO;
1873                 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
1874                 if (r)
1875                         goto out;
1876                 r = 0;
1877                 break;
1878         }
1879 #endif
1880 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
1881         case KVM_ASSIGN_PCI_DEVICE: {
1882                 struct kvm_assigned_pci_dev assigned_dev;
1883
1884                 r = -EFAULT;
1885                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
1886                         goto out;
1887                 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
1888                 if (r)
1889                         goto out;
1890                 break;
1891         }
1892         case KVM_ASSIGN_IRQ: {
1893                 struct kvm_assigned_irq assigned_irq;
1894
1895                 r = -EFAULT;
1896                 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
1897                         goto out;
1898                 r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
1899                 if (r)
1900                         goto out;
1901                 break;
1902         }
1903 #endif
1904 #ifdef KVM_CAP_DEVICE_DEASSIGNMENT
1905         case KVM_DEASSIGN_PCI_DEVICE: {
1906                 struct kvm_assigned_pci_dev assigned_dev;
1907
1908                 r = -EFAULT;
1909                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
1910                         goto out;
1911                 r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
1912                 if (r)
1913                         goto out;
1914                 break;
1915         }
1916 #endif
1917         default:
1918                 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
1919         }
1920 out:
1921         return r;
1922 }
1923
1924 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1925 {
1926         struct page *page[1];
1927         unsigned long addr;
1928         int npages;
1929         gfn_t gfn = vmf->pgoff;
1930         struct kvm *kvm = vma->vm_file->private_data;
1931
1932         addr = gfn_to_hva(kvm, gfn);
1933         if (kvm_is_error_hva(addr))
1934                 return VM_FAULT_SIGBUS;
1935
1936         npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
1937                                 NULL);
1938         if (unlikely(npages != 1))
1939                 return VM_FAULT_SIGBUS;
1940
1941         vmf->page = page[0];
1942         return 0;
1943 }
1944
1945 static struct vm_operations_struct kvm_vm_vm_ops = {
1946         .fault = kvm_vm_fault,
1947 };
1948
1949 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
1950 {
1951         vma->vm_ops = &kvm_vm_vm_ops;
1952         return 0;
1953 }
1954
1955 static struct file_operations kvm_vm_fops = {
1956         .release        = kvm_vm_release,
1957         .unlocked_ioctl = kvm_vm_ioctl,
1958         .compat_ioctl   = kvm_vm_ioctl,
1959         .mmap           = kvm_vm_mmap,
1960 };
1961
1962 static int kvm_dev_ioctl_create_vm(void)
1963 {
1964         int fd;
1965         struct kvm *kvm;
1966
1967         kvm = kvm_create_vm();
1968         if (IS_ERR(kvm))
1969                 return PTR_ERR(kvm);
1970         fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, 0);
1971         if (fd < 0)
1972                 kvm_put_kvm(kvm);
1973
1974         return fd;
1975 }
1976
1977 static long kvm_dev_ioctl_check_extension_generic(long arg)
1978 {
1979         switch (arg) {
1980         case KVM_CAP_USER_MEMORY:
1981         case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
1982                 return 1;
1983         default:
1984                 break;
1985         }
1986         return kvm_dev_ioctl_check_extension(arg);
1987 }
1988
1989 static long kvm_dev_ioctl(struct file *filp,
1990                           unsigned int ioctl, unsigned long arg)
1991 {
1992         long r = -EINVAL;
1993
1994         switch (ioctl) {
1995         case KVM_GET_API_VERSION:
1996                 r = -EINVAL;
1997                 if (arg)
1998                         goto out;
1999                 r = KVM_API_VERSION;
2000                 break;
2001         case KVM_CREATE_VM:
2002                 r = -EINVAL;
2003                 if (arg)
2004                         goto out;
2005                 r = kvm_dev_ioctl_create_vm();
2006                 break;
2007         case KVM_CHECK_EXTENSION:
2008                 r = kvm_dev_ioctl_check_extension_generic(arg);
2009                 break;
2010         case KVM_GET_VCPU_MMAP_SIZE:
2011                 r = -EINVAL;
2012                 if (arg)
2013                         goto out;
2014                 r = PAGE_SIZE;     /* struct kvm_run */
2015 #ifdef CONFIG_X86
2016                 r += PAGE_SIZE;    /* pio data page */
2017 #endif
2018 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2019                 r += PAGE_SIZE;    /* coalesced mmio ring page */
2020 #endif
2021                 break;
2022         case KVM_TRACE_ENABLE:
2023         case KVM_TRACE_PAUSE:
2024         case KVM_TRACE_DISABLE:
2025                 r = kvm_trace_ioctl(ioctl, arg);
2026                 break;
2027         default:
2028                 return kvm_arch_dev_ioctl(filp, ioctl, arg);
2029         }
2030 out:
2031         return r;
2032 }
2033
2034 static struct file_operations kvm_chardev_ops = {
2035         .unlocked_ioctl = kvm_dev_ioctl,
2036         .compat_ioctl   = kvm_dev_ioctl,
2037 };
2038
2039 static struct miscdevice kvm_dev = {
2040         KVM_MINOR,
2041         "kvm",
2042         &kvm_chardev_ops,
2043 };
2044
2045 static void hardware_enable(void *junk)
2046 {
2047         int cpu = raw_smp_processor_id();
2048
2049         if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
2050                 return;
2051         cpumask_set_cpu(cpu, cpus_hardware_enabled);
2052         kvm_arch_hardware_enable(NULL);
2053 }
2054
2055 static void hardware_disable(void *junk)
2056 {
2057         int cpu = raw_smp_processor_id();
2058
2059         if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
2060                 return;
2061         cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2062         kvm_arch_hardware_disable(NULL);
2063 }
2064
2065 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2066                            void *v)
2067 {
2068         int cpu = (long)v;
2069
2070         val &= ~CPU_TASKS_FROZEN;
2071         switch (val) {
2072         case CPU_DYING:
2073                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2074                        cpu);
2075                 hardware_disable(NULL);
2076                 break;
2077         case CPU_UP_CANCELED:
2078                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2079                        cpu);
2080                 smp_call_function_single(cpu, hardware_disable, NULL, 1);
2081                 break;
2082         case CPU_ONLINE:
2083                 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2084                        cpu);
2085                 smp_call_function_single(cpu, hardware_enable, NULL, 1);
2086                 break;
2087         }
2088         return NOTIFY_OK;
2089 }
2090
2091
2092 asmlinkage void kvm_handle_fault_on_reboot(void)
2093 {
2094         if (kvm_rebooting)
2095                 /* spin while reset goes on */
2096                 while (true)
2097                         ;
2098         /* Fault while not rebooting.  We want the trace. */
2099         BUG();
2100 }
2101 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot);
2102
2103 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2104                       void *v)
2105 {
2106         if (val == SYS_RESTART) {
2107                 /*
2108                  * Some (well, at least mine) BIOSes hang on reboot if
2109                  * in vmx root mode.
2110                  */
2111                 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2112                 kvm_rebooting = true;
2113                 on_each_cpu(hardware_disable, NULL, 1);
2114         }
2115         return NOTIFY_OK;
2116 }
2117
2118 static struct notifier_block kvm_reboot_notifier = {
2119         .notifier_call = kvm_reboot,
2120         .priority = 0,
2121 };
2122
2123 void kvm_io_bus_init(struct kvm_io_bus *bus)
2124 {
2125         memset(bus, 0, sizeof(*bus));
2126 }
2127
2128 void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2129 {
2130         int i;
2131
2132         for (i = 0; i < bus->dev_count; i++) {
2133                 struct kvm_io_device *pos = bus->devs[i];
2134
2135                 kvm_iodevice_destructor(pos);
2136         }
2137 }
2138
2139 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus,
2140                                           gpa_t addr, int len, int is_write)
2141 {
2142         int i;
2143
2144         for (i = 0; i < bus->dev_count; i++) {
2145                 struct kvm_io_device *pos = bus->devs[i];
2146
2147                 if (pos->in_range(pos, addr, len, is_write))
2148                         return pos;
2149         }
2150
2151         return NULL;
2152 }
2153
2154 void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
2155 {
2156         BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
2157
2158         bus->devs[bus->dev_count++] = dev;
2159 }
2160
2161 static struct notifier_block kvm_cpu_notifier = {
2162         .notifier_call = kvm_cpu_hotplug,
2163         .priority = 20, /* must be > scheduler priority */
2164 };
2165
2166 static int vm_stat_get(void *_offset, u64 *val)
2167 {
2168         unsigned offset = (long)_offset;
2169         struct kvm *kvm;
2170
2171         *val = 0;
2172         spin_lock(&kvm_lock);
2173         list_for_each_entry(kvm, &vm_list, vm_list)
2174                 *val += *(u32 *)((void *)kvm + offset);
2175         spin_unlock(&kvm_lock);
2176         return 0;
2177 }
2178
2179 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2180
2181 static int vcpu_stat_get(void *_offset, u64 *val)
2182 {
2183         unsigned offset = (long)_offset;
2184         struct kvm *kvm;
2185         struct kvm_vcpu *vcpu;
2186         int i;
2187
2188         *val = 0;
2189         spin_lock(&kvm_lock);
2190         list_for_each_entry(kvm, &vm_list, vm_list)
2191                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2192                         vcpu = kvm->vcpus[i];
2193                         if (vcpu)
2194                                 *val += *(u32 *)((void *)vcpu + offset);
2195                 }
2196         spin_unlock(&kvm_lock);
2197         return 0;
2198 }
2199
2200 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2201
2202 static struct file_operations *stat_fops[] = {
2203         [KVM_STAT_VCPU] = &vcpu_stat_fops,
2204         [KVM_STAT_VM]   = &vm_stat_fops,
2205 };
2206
2207 static void kvm_init_debug(void)
2208 {
2209         struct kvm_stats_debugfs_item *p;
2210
2211         kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2212         for (p = debugfs_entries; p->name; ++p)
2213                 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
2214                                                 (void *)(long)p->offset,
2215                                                 stat_fops[p->kind]);
2216 }
2217
2218 static void kvm_exit_debug(void)
2219 {
2220         struct kvm_stats_debugfs_item *p;
2221
2222         for (p = debugfs_entries; p->name; ++p)
2223                 debugfs_remove(p->dentry);
2224         debugfs_remove(kvm_debugfs_dir);
2225 }
2226
2227 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2228 {
2229         hardware_disable(NULL);
2230         return 0;
2231 }
2232
2233 static int kvm_resume(struct sys_device *dev)
2234 {
2235         hardware_enable(NULL);
2236         return 0;
2237 }
2238
2239 static struct sysdev_class kvm_sysdev_class = {
2240         .name = "kvm",
2241         .suspend = kvm_suspend,
2242         .resume = kvm_resume,
2243 };
2244
2245 static struct sys_device kvm_sysdev = {
2246         .id = 0,
2247         .cls = &kvm_sysdev_class,
2248 };
2249
2250 struct page *bad_page;
2251 pfn_t bad_pfn;
2252
2253 static inline
2254 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2255 {
2256         return container_of(pn, struct kvm_vcpu, preempt_notifier);
2257 }
2258
2259 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2260 {
2261         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2262
2263         kvm_arch_vcpu_load(vcpu, cpu);
2264 }
2265
2266 static void kvm_sched_out(struct preempt_notifier *pn,
2267                           struct task_struct *next)
2268 {
2269         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2270
2271         kvm_arch_vcpu_put(vcpu);
2272 }
2273
2274 int kvm_init(void *opaque, unsigned int vcpu_size,
2275                   struct module *module)
2276 {
2277         int r;
2278         int cpu;
2279
2280         kvm_init_debug();
2281
2282         r = kvm_arch_init(opaque);
2283         if (r)
2284                 goto out_fail;
2285
2286         bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2287
2288         if (bad_page == NULL) {
2289                 r = -ENOMEM;
2290                 goto out;
2291         }
2292
2293         bad_pfn = page_to_pfn(bad_page);
2294
2295         if (!alloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
2296                 r = -ENOMEM;
2297                 goto out_free_0;
2298         }
2299
2300         r = kvm_arch_hardware_setup();
2301         if (r < 0)
2302                 goto out_free_0a;
2303
2304         for_each_online_cpu(cpu) {
2305                 smp_call_function_single(cpu,
2306                                 kvm_arch_check_processor_compat,
2307                                 &r, 1);
2308                 if (r < 0)
2309                         goto out_free_1;
2310         }
2311
2312         on_each_cpu(hardware_enable, NULL, 1);
2313         r = register_cpu_notifier(&kvm_cpu_notifier);
2314         if (r)
2315                 goto out_free_2;
2316         register_reboot_notifier(&kvm_reboot_notifier);
2317
2318         r = sysdev_class_register(&kvm_sysdev_class);
2319         if (r)
2320                 goto out_free_3;
2321
2322         r = sysdev_register(&kvm_sysdev);
2323         if (r)
2324                 goto out_free_4;
2325
2326         /* A kmem cache lets us meet the alignment requirements of fx_save. */
2327         kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
2328                                            __alignof__(struct kvm_vcpu),
2329                                            0, NULL);
2330         if (!kvm_vcpu_cache) {
2331                 r = -ENOMEM;
2332                 goto out_free_5;
2333         }
2334
2335         kvm_chardev_ops.owner = module;
2336         kvm_vm_fops.owner = module;
2337         kvm_vcpu_fops.owner = module;
2338
2339         r = misc_register(&kvm_dev);
2340         if (r) {
2341                 printk(KERN_ERR "kvm: misc device register failed\n");
2342                 goto out_free;
2343         }
2344
2345         kvm_preempt_ops.sched_in = kvm_sched_in;
2346         kvm_preempt_ops.sched_out = kvm_sched_out;
2347 #ifndef CONFIG_X86
2348         msi2intx = 0;
2349 #endif
2350
2351         return 0;
2352
2353 out_free:
2354         kmem_cache_destroy(kvm_vcpu_cache);
2355 out_free_5:
2356         sysdev_unregister(&kvm_sysdev);
2357 out_free_4:
2358         sysdev_class_unregister(&kvm_sysdev_class);
2359 out_free_3:
2360         unregister_reboot_notifier(&kvm_reboot_notifier);
2361         unregister_cpu_notifier(&kvm_cpu_notifier);
2362 out_free_2:
2363         on_each_cpu(hardware_disable, NULL, 1);
2364 out_free_1:
2365         kvm_arch_hardware_unsetup();
2366 out_free_0a:
2367         free_cpumask_var(cpus_hardware_enabled);
2368 out_free_0:
2369         __free_page(bad_page);
2370 out:
2371         kvm_arch_exit();
2372         kvm_exit_debug();
2373 out_fail:
2374         return r;
2375 }
2376 EXPORT_SYMBOL_GPL(kvm_init);
2377
2378 void kvm_exit(void)
2379 {
2380         kvm_trace_cleanup();
2381         misc_deregister(&kvm_dev);
2382         kmem_cache_destroy(kvm_vcpu_cache);
2383         sysdev_unregister(&kvm_sysdev);
2384         sysdev_class_unregister(&kvm_sysdev_class);
2385         unregister_reboot_notifier(&kvm_reboot_notifier);
2386         unregister_cpu_notifier(&kvm_cpu_notifier);
2387         on_each_cpu(hardware_disable, NULL, 1);
2388         kvm_arch_hardware_unsetup();
2389         kvm_arch_exit();
2390         kvm_exit_debug();
2391         free_cpumask_var(cpus_hardware_enabled);
2392         __free_page(bad_page);
2393 }
2394 EXPORT_SYMBOL_GPL(kvm_exit);