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 const struct mmu_notifier_ops kvm_mmu_notifier_ops = { 793 .invalidate_page = kvm_mmu_notifier_invalidate_page, 794 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, 795 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, 796 .clear_flush_young = kvm_mmu_notifier_clear_flush_young, 797 }; 798 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ 799 800 static struct kvm *kvm_create_vm(void) 801 { 802 struct kvm *kvm = kvm_arch_create_vm(); 803 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET 804 struct page *page; 805 #endif 806 807 if (IS_ERR(kvm)) 808 goto out; 809 810 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET 811 page = alloc_page(GFP_KERNEL | __GFP_ZERO); 812 if (!page) { 813 kfree(kvm); 814 return ERR_PTR(-ENOMEM); 815 } 816 kvm->coalesced_mmio_ring = 817 (struct kvm_coalesced_mmio_ring *)page_address(page); 818 #endif 819 820 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) 821 { 822 int err; 823 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; 824 err = mmu_notifier_register(&kvm->mmu_notifier, current->mm); 825 if (err) { 826 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET 827 put_page(page); 828 #endif 829 kfree(kvm); 830 return ERR_PTR(err); 831 } 832 } 833 #endif 834 835 kvm->mm = current->mm; 836 atomic_inc(&kvm->mm->mm_count); 837 spin_lock_init(&kvm->mmu_lock); 838 kvm_io_bus_init(&kvm->pio_bus); 839 mutex_init(&kvm->lock); 840 kvm_io_bus_init(&kvm->mmio_bus); 841 init_rwsem(&kvm->slots_lock); 842 atomic_set(&kvm->users_count, 1); 843 spin_lock(&kvm_lock); 844 list_add(&kvm->vm_list, &vm_list); 845 spin_unlock(&kvm_lock); 846 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET 847 kvm_coalesced_mmio_init(kvm); 848 #endif 849 out: 850 return kvm; 851 } 852 853 /* 854 * Free any memory in @free but not in @dont. 855 */ 856 static void kvm_free_physmem_slot(struct kvm_memory_slot *free, 857 struct kvm_memory_slot *dont) 858 { 859 if (!dont || free->rmap != dont->rmap) 860 vfree(free->rmap); 861 862 if (!dont || free->dirty_bitmap != dont->dirty_bitmap) 863 vfree(free->dirty_bitmap); 864 865 if (!dont || free->lpage_info != dont->lpage_info) 866 vfree(free->lpage_info); 867 868 free->npages = 0; 869 free->dirty_bitmap = NULL; 870 free->rmap = NULL; 871 free->lpage_info = NULL; 872 } 873 874 void kvm_free_physmem(struct kvm *kvm) 875 { 876 int i; 877 878 for (i = 0; i < kvm->nmemslots; ++i) 879 kvm_free_physmem_slot(&kvm->memslots[i], NULL); 880 } 881 882 static void kvm_destroy_vm(struct kvm *kvm) 883 { 884 struct mm_struct *mm = kvm->mm; 885 886 spin_lock(&kvm_lock); 887 list_del(&kvm->vm_list); 888 spin_unlock(&kvm_lock); 889 kvm_io_bus_destroy(&kvm->pio_bus); 890 kvm_io_bus_destroy(&kvm->mmio_bus); 891 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET 892 if (kvm->coalesced_mmio_ring != NULL) 893 free_page((unsigned long)kvm->coalesced_mmio_ring); 894 #endif 895 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) 896 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); 897 #endif 898 kvm_arch_destroy_vm(kvm); 899 mmdrop(mm); 900 } 901 902 void kvm_get_kvm(struct kvm *kvm) 903 { 904 atomic_inc(&kvm->users_count); 905 } 906 EXPORT_SYMBOL_GPL(kvm_get_kvm); 907 908 void kvm_put_kvm(struct kvm *kvm) 909 { 910 if (atomic_dec_and_test(&kvm->users_count)) 911 kvm_destroy_vm(kvm); 912 } 913 EXPORT_SYMBOL_GPL(kvm_put_kvm); 914 915 916 static int kvm_vm_release(struct inode *inode, struct file *filp) 917 { 918 struct kvm *kvm = filp->private_data; 919 920 kvm_put_kvm(kvm); 921 return 0; 922 } 923 924 /* 925 * Allocate some memory and give it an address in the guest physical address 926 * space. 927 * 928 * Discontiguous memory is allowed, mostly for framebuffers. 929 * 930 * Must be called holding mmap_sem for write. 931 */ 932 int __kvm_set_memory_region(struct kvm *kvm, 933 struct kvm_userspace_memory_region *mem, 934 int user_alloc) 935 { 936 int r; 937 gfn_t base_gfn; 938 unsigned long npages; 939 unsigned long i; 940 struct kvm_memory_slot *memslot; 941 struct kvm_memory_slot old, new; 942 943 r = -EINVAL; 944 /* General sanity checks */ 945 if (mem->memory_size & (PAGE_SIZE - 1)) 946 goto out; 947 if (mem->guest_phys_addr & (PAGE_SIZE - 1)) 948 goto out; 949 if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1))) 950 goto out; 951 if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS) 952 goto out; 953 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) 954 goto out; 955 956 memslot = &kvm->memslots[mem->slot]; 957 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; 958 npages = mem->memory_size >> PAGE_SHIFT; 959 960 if (!npages) 961 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; 962 963 new = old = *memslot; 964 965 new.base_gfn = base_gfn; 966 new.npages = npages; 967 new.flags = mem->flags; 968 969 /* Disallow changing a memory slot's size. */ 970 r = -EINVAL; 971 if (npages && old.npages && npages != old.npages) 972 goto out_free; 973 974 /* Check for overlaps */ 975 r = -EEXIST; 976 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { 977 struct kvm_memory_slot *s = &kvm->memslots[i]; 978 979 if (s == memslot) 980 continue; 981 if (!((base_gfn + npages <= s->base_gfn) || 982 (base_gfn >= s->base_gfn + s->npages))) 983 goto out_free; 984 } 985 986 /* Free page dirty bitmap if unneeded */ 987 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) 988 new.dirty_bitmap = NULL; 989 990 r = -ENOMEM; 991 992 /* Allocate if a slot is being created */ 993 #ifndef CONFIG_S390 994 if (npages && !new.rmap) { 995 new.rmap = vmalloc(npages * sizeof(struct page *)); 996 997 if (!new.rmap) 998 goto out_free; 999 1000 memset(new.rmap, 0, npages * sizeof(*new.rmap)); 1001 1002 new.user_alloc = user_alloc; 1003 /* 1004 * hva_to_rmmap() serialzies with the mmu_lock and to be 1005 * safe it has to ignore memslots with !user_alloc && 1006 * !userspace_addr. 1007 */ 1008 if (user_alloc) 1009 new.userspace_addr = mem->userspace_addr; 1010 else 1011 new.userspace_addr = 0; 1012 } 1013 if (npages && !new.lpage_info) { 1014 int largepages = npages / KVM_PAGES_PER_HPAGE; 1015 if (npages % KVM_PAGES_PER_HPAGE) 1016 largepages++; 1017 if (base_gfn % KVM_PAGES_PER_HPAGE) 1018 largepages++; 1019 1020 new.lpage_info = vmalloc(largepages * sizeof(*new.lpage_info)); 1021 1022 if (!new.lpage_info) 1023 goto out_free; 1024 1025 memset(new.lpage_info, 0, largepages * sizeof(*new.lpage_info)); 1026 1027 if (base_gfn % KVM_PAGES_PER_HPAGE) 1028 new.lpage_info[0].write_count = 1; 1029 if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE) 1030 new.lpage_info[largepages-1].write_count = 1; 1031 } 1032 1033 /* Allocate page dirty bitmap if needed */ 1034 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { 1035 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8; 1036 1037 new.dirty_bitmap = vmalloc(dirty_bytes); 1038 if (!new.dirty_bitmap) 1039 goto out_free; 1040 memset(new.dirty_bitmap, 0, dirty_bytes); 1041 } 1042 #endif /* not defined CONFIG_S390 */ 1043 1044 if (!npages) 1045 kvm_arch_flush_shadow(kvm); 1046 1047 spin_lock(&kvm->mmu_lock); 1048 if (mem->slot >= kvm->nmemslots) 1049 kvm->nmemslots = mem->slot + 1; 1050 1051 *memslot = new; 1052 spin_unlock(&kvm->mmu_lock); 1053 1054 r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc); 1055 if (r) { 1056 spin_lock(&kvm->mmu_lock); 1057 *memslot = old; 1058 spin_unlock(&kvm->mmu_lock); 1059 goto out_free; 1060 } 1061 1062 kvm_free_physmem_slot(&old, npages ? &new : NULL); 1063 /* Slot deletion case: we have to update the current slot */ 1064 if (!npages) 1065 *memslot = old; 1066 #ifdef CONFIG_DMAR 1067 /* map the pages in iommu page table */ 1068 r = kvm_iommu_map_pages(kvm, base_gfn, npages); 1069 if (r) 1070 goto out; 1071 #endif 1072 return 0; 1073 1074 out_free: 1075 kvm_free_physmem_slot(&new, &old); 1076 out: 1077 return r; 1078 1079 } 1080 EXPORT_SYMBOL_GPL(__kvm_set_memory_region); 1081 1082 int kvm_set_memory_region(struct kvm *kvm, 1083 struct kvm_userspace_memory_region *mem, 1084 int user_alloc) 1085 { 1086 int r; 1087 1088 down_write(&kvm->slots_lock); 1089 r = __kvm_set_memory_region(kvm, mem, user_alloc); 1090 up_write(&kvm->slots_lock); 1091 return r; 1092 } 1093 EXPORT_SYMBOL_GPL(kvm_set_memory_region); 1094 1095 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, 1096 struct 1097 kvm_userspace_memory_region *mem, 1098 int user_alloc) 1099 { 1100 if (mem->slot >= KVM_MEMORY_SLOTS) 1101 return -EINVAL; 1102 return kvm_set_memory_region(kvm, mem, user_alloc); 1103 } 1104 1105 int kvm_get_dirty_log(struct kvm *kvm, 1106 struct kvm_dirty_log *log, int *is_dirty) 1107 { 1108 struct kvm_memory_slot *memslot; 1109 int r, i; 1110 int n; 1111 unsigned long any = 0; 1112 1113 r = -EINVAL; 1114 if (log->slot >= KVM_MEMORY_SLOTS) 1115 goto out; 1116 1117 memslot = &kvm->memslots[log->slot]; 1118 r = -ENOENT; 1119 if (!memslot->dirty_bitmap) 1120 goto out; 1121 1122 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8; 1123 1124 for (i = 0; !any && i < n/sizeof(long); ++i) 1125 any = memslot->dirty_bitmap[i]; 1126 1127 r = -EFAULT; 1128 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) 1129 goto out; 1130 1131 if (any) 1132 *is_dirty = 1; 1133 1134 r = 0; 1135 out: 1136 return r; 1137 } 1138 1139 int is_error_page(struct page *page) 1140 { 1141 return page == bad_page; 1142 } 1143 EXPORT_SYMBOL_GPL(is_error_page); 1144 1145 int is_error_pfn(pfn_t pfn) 1146 { 1147 return pfn == bad_pfn; 1148 } 1149 EXPORT_SYMBOL_GPL(is_error_pfn); 1150 1151 static inline unsigned long bad_hva(void) 1152 { 1153 return PAGE_OFFSET; 1154 } 1155 1156 int kvm_is_error_hva(unsigned long addr) 1157 { 1158 return addr == bad_hva(); 1159 } 1160 EXPORT_SYMBOL_GPL(kvm_is_error_hva); 1161 1162 struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn) 1163 { 1164 int i; 1165 1166 for (i = 0; i < kvm->nmemslots; ++i) { 1167 struct kvm_memory_slot *memslot = &kvm->memslots[i]; 1168 1169 if (gfn >= memslot->base_gfn 1170 && gfn < memslot->base_gfn + memslot->npages) 1171 return memslot; 1172 } 1173 return NULL; 1174 } 1175 EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased); 1176 1177 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) 1178 { 1179 gfn = unalias_gfn(kvm, gfn); 1180 return gfn_to_memslot_unaliased(kvm, gfn); 1181 } 1182 1183 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) 1184 { 1185 int i; 1186 1187 gfn = unalias_gfn(kvm, gfn); 1188 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { 1189 struct kvm_memory_slot *memslot = &kvm->memslots[i]; 1190 1191 if (gfn >= memslot->base_gfn 1192 && gfn < memslot->base_gfn + memslot->npages) 1193 return 1; 1194 } 1195 return 0; 1196 } 1197 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); 1198 1199 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) 1200 { 1201 struct kvm_memory_slot *slot; 1202 1203 gfn = unalias_gfn(kvm, gfn); 1204 slot = gfn_to_memslot_unaliased(kvm, gfn); 1205 if (!slot) 1206 return bad_hva(); 1207 return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE); 1208 } 1209 EXPORT_SYMBOL_GPL(gfn_to_hva); 1210 1211 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) 1212 { 1213 struct page *page[1]; 1214 unsigned long addr; 1215 int npages; 1216 pfn_t pfn; 1217 1218 might_sleep(); 1219 1220 addr = gfn_to_hva(kvm, gfn); 1221 if (kvm_is_error_hva(addr)) { 1222 get_page(bad_page); 1223 return page_to_pfn(bad_page); 1224 } 1225 1226 npages = get_user_pages_fast(addr, 1, 1, page); 1227 1228 if (unlikely(npages != 1)) { 1229 struct vm_area_struct *vma; 1230 1231 down_read(¤t->mm->mmap_sem); 1232 vma = find_vma(current->mm, addr); 1233 1234 if (vma == NULL || addr < vma->vm_start || 1235 !(vma->vm_flags & VM_PFNMAP)) { 1236 up_read(¤t->mm->mmap_sem); 1237 get_page(bad_page); 1238 return page_to_pfn(bad_page); 1239 } 1240 1241 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff; 1242 up_read(¤t->mm->mmap_sem); 1243 BUG_ON(!kvm_is_mmio_pfn(pfn)); 1244 } else 1245 pfn = page_to_pfn(page[0]); 1246 1247 return pfn; 1248 } 1249 1250 EXPORT_SYMBOL_GPL(gfn_to_pfn); 1251 1252 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) 1253 { 1254 pfn_t pfn; 1255 1256 pfn = gfn_to_pfn(kvm, gfn); 1257 if (!kvm_is_mmio_pfn(pfn)) 1258 return pfn_to_page(pfn); 1259 1260 WARN_ON(kvm_is_mmio_pfn(pfn)); 1261 1262 get_page(bad_page); 1263 return bad_page; 1264 } 1265 1266 EXPORT_SYMBOL_GPL(gfn_to_page); 1267 1268 void kvm_release_page_clean(struct page *page) 1269 { 1270 kvm_release_pfn_clean(page_to_pfn(page)); 1271 } 1272 EXPORT_SYMBOL_GPL(kvm_release_page_clean); 1273 1274 void kvm_release_pfn_clean(pfn_t pfn) 1275 { 1276 if (!kvm_is_mmio_pfn(pfn)) 1277 put_page(pfn_to_page(pfn)); 1278 } 1279 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); 1280 1281 void kvm_release_page_dirty(struct page *page) 1282 { 1283 kvm_release_pfn_dirty(page_to_pfn(page)); 1284 } 1285 EXPORT_SYMBOL_GPL(kvm_release_page_dirty); 1286 1287 void kvm_release_pfn_dirty(pfn_t pfn) 1288 { 1289 kvm_set_pfn_dirty(pfn); 1290 kvm_release_pfn_clean(pfn); 1291 } 1292 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); 1293 1294 void kvm_set_page_dirty(struct page *page) 1295 { 1296 kvm_set_pfn_dirty(page_to_pfn(page)); 1297 } 1298 EXPORT_SYMBOL_GPL(kvm_set_page_dirty); 1299 1300 void kvm_set_pfn_dirty(pfn_t pfn) 1301 { 1302 if (!kvm_is_mmio_pfn(pfn)) { 1303 struct page *page = pfn_to_page(pfn); 1304 if (!PageReserved(page)) 1305 SetPageDirty(page); 1306 } 1307 } 1308 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); 1309 1310 void kvm_set_pfn_accessed(pfn_t pfn) 1311 { 1312 if (!kvm_is_mmio_pfn(pfn)) 1313 mark_page_accessed(pfn_to_page(pfn)); 1314 } 1315 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); 1316 1317 void kvm_get_pfn(pfn_t pfn) 1318 { 1319 if (!kvm_is_mmio_pfn(pfn)) 1320 get_page(pfn_to_page(pfn)); 1321 } 1322 EXPORT_SYMBOL_GPL(kvm_get_pfn); 1323 1324 static int next_segment(unsigned long len, int offset) 1325 { 1326 if (len > PAGE_SIZE - offset) 1327 return PAGE_SIZE - offset; 1328 else 1329 return len; 1330 } 1331 1332 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, 1333 int len) 1334 { 1335 int r; 1336 unsigned long addr; 1337 1338 addr = gfn_to_hva(kvm, gfn); 1339 if (kvm_is_error_hva(addr)) 1340 return -EFAULT; 1341 r = copy_from_user(data, (void __user *)addr + offset, len); 1342 if (r) 1343 return -EFAULT; 1344 return 0; 1345 } 1346 EXPORT_SYMBOL_GPL(kvm_read_guest_page); 1347 1348 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) 1349 { 1350 gfn_t gfn = gpa >> PAGE_SHIFT; 1351 int seg; 1352 int offset = offset_in_page(gpa); 1353 int ret; 1354 1355 while ((seg = next_segment(len, offset)) != 0) { 1356 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); 1357 if (ret < 0) 1358 return ret; 1359 offset = 0; 1360 len -= seg; 1361 data += seg; 1362 ++gfn; 1363 } 1364 return 0; 1365 } 1366 EXPORT_SYMBOL_GPL(kvm_read_guest); 1367 1368 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, 1369 unsigned long len) 1370 { 1371 int r; 1372 unsigned long addr; 1373 gfn_t gfn = gpa >> PAGE_SHIFT; 1374 int offset = offset_in_page(gpa); 1375 1376 addr = gfn_to_hva(kvm, gfn); 1377 if (kvm_is_error_hva(addr)) 1378 return -EFAULT; 1379 pagefault_disable(); 1380 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); 1381 pagefault_enable(); 1382 if (r) 1383 return -EFAULT; 1384 return 0; 1385 } 1386 EXPORT_SYMBOL(kvm_read_guest_atomic); 1387 1388 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, 1389 int offset, int len) 1390 { 1391 int r; 1392 unsigned long addr; 1393 1394 addr = gfn_to_hva(kvm, gfn); 1395 if (kvm_is_error_hva(addr)) 1396 return -EFAULT; 1397 r = copy_to_user((void __user *)addr + offset, data, len); 1398 if (r) 1399 return -EFAULT; 1400 mark_page_dirty(kvm, gfn); 1401 return 0; 1402 } 1403 EXPORT_SYMBOL_GPL(kvm_write_guest_page); 1404 1405 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, 1406 unsigned long len) 1407 { 1408 gfn_t gfn = gpa >> PAGE_SHIFT; 1409 int seg; 1410 int offset = offset_in_page(gpa); 1411 int ret; 1412 1413 while ((seg = next_segment(len, offset)) != 0) { 1414 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); 1415 if (ret < 0) 1416 return ret; 1417 offset = 0; 1418 len -= seg; 1419 data += seg; 1420 ++gfn; 1421 } 1422 return 0; 1423 } 1424 1425 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) 1426 { 1427 return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len); 1428 } 1429 EXPORT_SYMBOL_GPL(kvm_clear_guest_page); 1430 1431 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) 1432 { 1433 gfn_t gfn = gpa >> PAGE_SHIFT; 1434 int seg; 1435 int offset = offset_in_page(gpa); 1436 int ret; 1437 1438 while ((seg = next_segment(len, offset)) != 0) { 1439 ret = kvm_clear_guest_page(kvm, gfn, offset, seg); 1440 if (ret < 0) 1441 return ret; 1442 offset = 0; 1443 len -= seg; 1444 ++gfn; 1445 } 1446 return 0; 1447 } 1448 EXPORT_SYMBOL_GPL(kvm_clear_guest); 1449 1450 void mark_page_dirty(struct kvm *kvm, gfn_t gfn) 1451 { 1452 struct kvm_memory_slot *memslot; 1453 1454 gfn = unalias_gfn(kvm, gfn); 1455 memslot = gfn_to_memslot_unaliased(kvm, gfn); 1456 if (memslot && memslot->dirty_bitmap) { 1457 unsigned long rel_gfn = gfn - memslot->base_gfn; 1458 1459 /* avoid RMW */ 1460 if (!test_bit(rel_gfn, memslot->dirty_bitmap)) 1461 set_bit(rel_gfn, memslot->dirty_bitmap); 1462 } 1463 } 1464 1465 /* 1466 * The vCPU has executed a HLT instruction with in-kernel mode enabled. 1467 */ 1468 void kvm_vcpu_block(struct kvm_vcpu *vcpu) 1469 { 1470 DEFINE_WAIT(wait); 1471 1472 for (;;) { 1473 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); 1474 1475 if (kvm_cpu_has_interrupt(vcpu) || 1476 kvm_cpu_has_pending_timer(vcpu) || 1477 kvm_arch_vcpu_runnable(vcpu)) { 1478 set_bit(KVM_REQ_UNHALT, &vcpu->requests); 1479 break; 1480 } 1481 if (signal_pending(current)) 1482 break; 1483 1484 vcpu_put(vcpu); 1485 schedule(); 1486 vcpu_load(vcpu); 1487 } 1488 1489 finish_wait(&vcpu->wq, &wait); 1490 } 1491 1492 void kvm_resched(struct kvm_vcpu *vcpu) 1493 { 1494 if (!need_resched()) 1495 return; 1496 cond_resched(); 1497 } 1498 EXPORT_SYMBOL_GPL(kvm_resched); 1499 1500 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 1501 { 1502 struct kvm_vcpu *vcpu = vma->vm_file->private_data; 1503 struct page *page; 1504 1505 if (vmf->pgoff == 0) 1506 page = virt_to_page(vcpu->run); 1507 #ifdef CONFIG_X86 1508 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) 1509 page = virt_to_page(vcpu->arch.pio_data); 1510 #endif 1511 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET 1512 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) 1513 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); 1514 #endif 1515 else 1516 return VM_FAULT_SIGBUS; 1517 get_page(page); 1518 vmf->page = page; 1519 return 0; 1520 } 1521 1522 static struct vm_operations_struct kvm_vcpu_vm_ops = { 1523 .fault = kvm_vcpu_fault, 1524 }; 1525 1526 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) 1527 { 1528 vma->vm_ops = &kvm_vcpu_vm_ops; 1529 return 0; 1530 } 1531 1532 static int kvm_vcpu_release(struct inode *inode, struct file *filp) 1533 { 1534 struct kvm_vcpu *vcpu = filp->private_data; 1535 1536 kvm_put_kvm(vcpu->kvm); 1537 return 0; 1538 } 1539 1540 static struct file_operations kvm_vcpu_fops = { 1541 .release = kvm_vcpu_release, 1542 .unlocked_ioctl = kvm_vcpu_ioctl, 1543 .compat_ioctl = kvm_vcpu_ioctl, 1544 .mmap = kvm_vcpu_mmap, 1545 }; 1546 1547 /* 1548 * Allocates an inode for the vcpu. 1549 */ 1550 static int create_vcpu_fd(struct kvm_vcpu *vcpu) 1551 { 1552 int fd = anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, 0); 1553 if (fd < 0) 1554 kvm_put_kvm(vcpu->kvm); 1555 return fd; 1556 } 1557 1558 /* 1559 * Creates some virtual cpus. Good luck creating more than one. 1560 */ 1561 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n) 1562 { 1563 int r; 1564 struct kvm_vcpu *vcpu; 1565 1566 if (!valid_vcpu(n)) 1567 return -EINVAL; 1568 1569 vcpu = kvm_arch_vcpu_create(kvm, n); 1570 if (IS_ERR(vcpu)) 1571 return PTR_ERR(vcpu); 1572 1573 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); 1574 1575 r = kvm_arch_vcpu_setup(vcpu); 1576 if (r) 1577 return r; 1578 1579 mutex_lock(&kvm->lock); 1580 if (kvm->vcpus[n]) { 1581 r = -EEXIST; 1582 goto vcpu_destroy; 1583 } 1584 kvm->vcpus[n] = vcpu; 1585 mutex_unlock(&kvm->lock); 1586 1587 /* Now it's all set up, let userspace reach it */ 1588 kvm_get_kvm(kvm); 1589 r = create_vcpu_fd(vcpu); 1590 if (r < 0) 1591 goto unlink; 1592 return r; 1593 1594 unlink: 1595 mutex_lock(&kvm->lock); 1596 kvm->vcpus[n] = NULL; 1597 vcpu_destroy: 1598 mutex_unlock(&kvm->lock); 1599 kvm_arch_vcpu_destroy(vcpu); 1600 return r; 1601 } 1602 1603 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) 1604 { 1605 if (sigset) { 1606 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); 1607 vcpu->sigset_active = 1; 1608 vcpu->sigset = *sigset; 1609 } else 1610 vcpu->sigset_active = 0; 1611 return 0; 1612 } 1613 1614 static long kvm_vcpu_ioctl(struct file *filp, 1615 unsigned int ioctl, unsigned long arg) 1616 { 1617 struct kvm_vcpu *vcpu = filp->private_data; 1618 void __user *argp = (void __user *)arg; 1619 int r; 1620 struct kvm_fpu *fpu = NULL; 1621 struct kvm_sregs *kvm_sregs = NULL; 1622 1623 if (vcpu->kvm->mm != current->mm) 1624 return -EIO; 1625 switch (ioctl) { 1626 case KVM_RUN: 1627 r = -EINVAL; 1628 if (arg) 1629 goto out; 1630 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); 1631 break; 1632 case KVM_GET_REGS: { 1633 struct kvm_regs *kvm_regs; 1634 1635 r = -ENOMEM; 1636 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); 1637 if (!kvm_regs) 1638 goto out; 1639 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); 1640 if (r) 1641 goto out_free1; 1642 r = -EFAULT; 1643 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) 1644 goto out_free1; 1645 r = 0; 1646 out_free1: 1647 kfree(kvm_regs); 1648 break; 1649 } 1650 case KVM_SET_REGS: { 1651 struct kvm_regs *kvm_regs; 1652 1653 r = -ENOMEM; 1654 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); 1655 if (!kvm_regs) 1656 goto out; 1657 r = -EFAULT; 1658 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs))) 1659 goto out_free2; 1660 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); 1661 if (r) 1662 goto out_free2; 1663 r = 0; 1664 out_free2: 1665 kfree(kvm_regs); 1666 break; 1667 } 1668 case KVM_GET_SREGS: { 1669 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); 1670 r = -ENOMEM; 1671 if (!kvm_sregs) 1672 goto out; 1673 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); 1674 if (r) 1675 goto out; 1676 r = -EFAULT; 1677 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) 1678 goto out; 1679 r = 0; 1680 break; 1681 } 1682 case KVM_SET_SREGS: { 1683 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL); 1684 r = -ENOMEM; 1685 if (!kvm_sregs) 1686 goto out; 1687 r = -EFAULT; 1688 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs))) 1689 goto out; 1690 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); 1691 if (r) 1692 goto out; 1693 r = 0; 1694 break; 1695 } 1696 case KVM_GET_MP_STATE: { 1697 struct kvm_mp_state mp_state; 1698 1699 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); 1700 if (r) 1701 goto out; 1702 r = -EFAULT; 1703 if (copy_to_user(argp, &mp_state, sizeof mp_state)) 1704 goto out; 1705 r = 0; 1706 break; 1707 } 1708 case KVM_SET_MP_STATE: { 1709 struct kvm_mp_state mp_state; 1710 1711 r = -EFAULT; 1712 if (copy_from_user(&mp_state, argp, sizeof mp_state)) 1713 goto out; 1714 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); 1715 if (r) 1716 goto out; 1717 r = 0; 1718 break; 1719 } 1720 case KVM_TRANSLATE: { 1721 struct kvm_translation tr; 1722 1723 r = -EFAULT; 1724 if (copy_from_user(&tr, argp, sizeof tr)) 1725 goto out; 1726 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); 1727 if (r) 1728 goto out; 1729 r = -EFAULT; 1730 if (copy_to_user(argp, &tr, sizeof tr)) 1731 goto out; 1732 r = 0; 1733 break; 1734 } 1735 case KVM_DEBUG_GUEST: { 1736 struct kvm_debug_guest dbg; 1737 1738 r = -EFAULT; 1739 if (copy_from_user(&dbg, argp, sizeof dbg)) 1740 goto out; 1741 r = kvm_arch_vcpu_ioctl_debug_guest(vcpu, &dbg); 1742 if (r) 1743 goto out; 1744 r = 0; 1745 break; 1746 } 1747 case KVM_SET_SIGNAL_MASK: { 1748 struct kvm_signal_mask __user *sigmask_arg = argp; 1749 struct kvm_signal_mask kvm_sigmask; 1750 sigset_t sigset, *p; 1751 1752 p = NULL; 1753 if (argp) { 1754 r = -EFAULT; 1755 if (copy_from_user(&kvm_sigmask, argp, 1756 sizeof kvm_sigmask)) 1757 goto out; 1758 r = -EINVAL; 1759 if (kvm_sigmask.len != sizeof sigset) 1760 goto out; 1761 r = -EFAULT; 1762 if (copy_from_user(&sigset, sigmask_arg->sigset, 1763 sizeof sigset)) 1764 goto out; 1765 p = &sigset; 1766 } 1767 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); 1768 break; 1769 } 1770 case KVM_GET_FPU: { 1771 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); 1772 r = -ENOMEM; 1773 if (!fpu) 1774 goto out; 1775 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); 1776 if (r) 1777 goto out; 1778 r = -EFAULT; 1779 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) 1780 goto out; 1781 r = 0; 1782 break; 1783 } 1784 case KVM_SET_FPU: { 1785 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL); 1786 r = -ENOMEM; 1787 if (!fpu) 1788 goto out; 1789 r = -EFAULT; 1790 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu))) 1791 goto out; 1792 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); 1793 if (r) 1794 goto out; 1795 r = 0; 1796 break; 1797 } 1798 default: 1799 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); 1800 } 1801 out: 1802 kfree(fpu); 1803 kfree(kvm_sregs); 1804 return r; 1805 } 1806 1807 static long kvm_vm_ioctl(struct file *filp, 1808 unsigned int ioctl, unsigned long arg) 1809 { 1810 struct kvm *kvm = filp->private_data; 1811 void __user *argp = (void __user *)arg; 1812 int r; 1813 1814 if (kvm->mm != current->mm) 1815 return -EIO; 1816 switch (ioctl) { 1817 case KVM_CREATE_VCPU: 1818 r = kvm_vm_ioctl_create_vcpu(kvm, arg); 1819 if (r < 0) 1820 goto out; 1821 break; 1822 case KVM_SET_USER_MEMORY_REGION: { 1823 struct kvm_userspace_memory_region kvm_userspace_mem; 1824 1825 r = -EFAULT; 1826 if (copy_from_user(&kvm_userspace_mem, argp, 1827 sizeof kvm_userspace_mem)) 1828 goto out; 1829 1830 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1); 1831 if (r) 1832 goto out; 1833 break; 1834 } 1835 case KVM_GET_DIRTY_LOG: { 1836 struct kvm_dirty_log log; 1837 1838 r = -EFAULT; 1839 if (copy_from_user(&log, argp, sizeof log)) 1840 goto out; 1841 r = kvm_vm_ioctl_get_dirty_log(kvm, &log); 1842 if (r) 1843 goto out; 1844 break; 1845 } 1846 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET 1847 case KVM_REGISTER_COALESCED_MMIO: { 1848 struct kvm_coalesced_mmio_zone zone; 1849 r = -EFAULT; 1850 if (copy_from_user(&zone, argp, sizeof zone)) 1851 goto out; 1852 r = -ENXIO; 1853 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); 1854 if (r) 1855 goto out; 1856 r = 0; 1857 break; 1858 } 1859 case KVM_UNREGISTER_COALESCED_MMIO: { 1860 struct kvm_coalesced_mmio_zone zone; 1861 r = -EFAULT; 1862 if (copy_from_user(&zone, argp, sizeof zone)) 1863 goto out; 1864 r = -ENXIO; 1865 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); 1866 if (r) 1867 goto out; 1868 r = 0; 1869 break; 1870 } 1871 #endif 1872 #ifdef KVM_CAP_DEVICE_ASSIGNMENT 1873 case KVM_ASSIGN_PCI_DEVICE: { 1874 struct kvm_assigned_pci_dev assigned_dev; 1875 1876 r = -EFAULT; 1877 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev)) 1878 goto out; 1879 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev); 1880 if (r) 1881 goto out; 1882 break; 1883 } 1884 case KVM_ASSIGN_IRQ: { 1885 struct kvm_assigned_irq assigned_irq; 1886 1887 r = -EFAULT; 1888 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq)) 1889 goto out; 1890 r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq); 1891 if (r) 1892 goto out; 1893 break; 1894 } 1895 #endif 1896 #ifdef KVM_CAP_DEVICE_DEASSIGNMENT 1897 case KVM_DEASSIGN_PCI_DEVICE: { 1898 struct kvm_assigned_pci_dev assigned_dev; 1899 1900 r = -EFAULT; 1901 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev)) 1902 goto out; 1903 r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev); 1904 if (r) 1905 goto out; 1906 break; 1907 } 1908 #endif 1909 default: 1910 r = kvm_arch_vm_ioctl(filp, ioctl, arg); 1911 } 1912 out: 1913 return r; 1914 } 1915 1916 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 1917 { 1918 struct page *page[1]; 1919 unsigned long addr; 1920 int npages; 1921 gfn_t gfn = vmf->pgoff; 1922 struct kvm *kvm = vma->vm_file->private_data; 1923 1924 addr = gfn_to_hva(kvm, gfn); 1925 if (kvm_is_error_hva(addr)) 1926 return VM_FAULT_SIGBUS; 1927 1928 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page, 1929 NULL); 1930 if (unlikely(npages != 1)) 1931 return VM_FAULT_SIGBUS; 1932 1933 vmf->page = page[0]; 1934 return 0; 1935 } 1936 1937 static struct vm_operations_struct kvm_vm_vm_ops = { 1938 .fault = kvm_vm_fault, 1939 }; 1940 1941 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma) 1942 { 1943 vma->vm_ops = &kvm_vm_vm_ops; 1944 return 0; 1945 } 1946 1947 static struct file_operations kvm_vm_fops = { 1948 .release = kvm_vm_release, 1949 .unlocked_ioctl = kvm_vm_ioctl, 1950 .compat_ioctl = kvm_vm_ioctl, 1951 .mmap = kvm_vm_mmap, 1952 }; 1953 1954 static int kvm_dev_ioctl_create_vm(void) 1955 { 1956 int fd; 1957 struct kvm *kvm; 1958 1959 kvm = kvm_create_vm(); 1960 if (IS_ERR(kvm)) 1961 return PTR_ERR(kvm); 1962 fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, 0); 1963 if (fd < 0) 1964 kvm_put_kvm(kvm); 1965 1966 return fd; 1967 } 1968 1969 static long kvm_dev_ioctl_check_extension_generic(long arg) 1970 { 1971 switch (arg) { 1972 case KVM_CAP_USER_MEMORY: 1973 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: 1974 return 1; 1975 default: 1976 break; 1977 } 1978 return kvm_dev_ioctl_check_extension(arg); 1979 } 1980 1981 static long kvm_dev_ioctl(struct file *filp, 1982 unsigned int ioctl, unsigned long arg) 1983 { 1984 long r = -EINVAL; 1985 1986 switch (ioctl) { 1987 case KVM_GET_API_VERSION: 1988 r = -EINVAL; 1989 if (arg) 1990 goto out; 1991 r = KVM_API_VERSION; 1992 break; 1993 case KVM_CREATE_VM: 1994 r = -EINVAL; 1995 if (arg) 1996 goto out; 1997 r = kvm_dev_ioctl_create_vm(); 1998 break; 1999 case KVM_CHECK_EXTENSION: 2000 r = kvm_dev_ioctl_check_extension_generic(arg); 2001 break; 2002 case KVM_GET_VCPU_MMAP_SIZE: 2003 r = -EINVAL; 2004 if (arg) 2005 goto out; 2006 r = PAGE_SIZE; /* struct kvm_run */ 2007 #ifdef CONFIG_X86 2008 r += PAGE_SIZE; /* pio data page */ 2009 #endif 2010 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET 2011 r += PAGE_SIZE; /* coalesced mmio ring page */ 2012 #endif 2013 break; 2014 case KVM_TRACE_ENABLE: 2015 case KVM_TRACE_PAUSE: 2016 case KVM_TRACE_DISABLE: 2017 r = kvm_trace_ioctl(ioctl, arg); 2018 break; 2019 default: 2020 return kvm_arch_dev_ioctl(filp, ioctl, arg); 2021 } 2022 out: 2023 return r; 2024 } 2025 2026 static struct file_operations kvm_chardev_ops = { 2027 .unlocked_ioctl = kvm_dev_ioctl, 2028 .compat_ioctl = kvm_dev_ioctl, 2029 }; 2030 2031 static struct miscdevice kvm_dev = { 2032 KVM_MINOR, 2033 "kvm", 2034 &kvm_chardev_ops, 2035 }; 2036 2037 static void hardware_enable(void *junk) 2038 { 2039 int cpu = raw_smp_processor_id(); 2040 2041 if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) 2042 return; 2043 cpumask_set_cpu(cpu, cpus_hardware_enabled); 2044 kvm_arch_hardware_enable(NULL); 2045 } 2046 2047 static void hardware_disable(void *junk) 2048 { 2049 int cpu = raw_smp_processor_id(); 2050 2051 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) 2052 return; 2053 cpumask_clear_cpu(cpu, cpus_hardware_enabled); 2054 kvm_arch_hardware_disable(NULL); 2055 } 2056 2057 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, 2058 void *v) 2059 { 2060 int cpu = (long)v; 2061 2062 val &= ~CPU_TASKS_FROZEN; 2063 switch (val) { 2064 case CPU_DYING: 2065 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", 2066 cpu); 2067 hardware_disable(NULL); 2068 break; 2069 case CPU_UP_CANCELED: 2070 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", 2071 cpu); 2072 smp_call_function_single(cpu, hardware_disable, NULL, 1); 2073 break; 2074 case CPU_ONLINE: 2075 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n", 2076 cpu); 2077 smp_call_function_single(cpu, hardware_enable, NULL, 1); 2078 break; 2079 } 2080 return NOTIFY_OK; 2081 } 2082 2083 2084 asmlinkage void kvm_handle_fault_on_reboot(void) 2085 { 2086 if (kvm_rebooting) 2087 /* spin while reset goes on */ 2088 while (true) 2089 ; 2090 /* Fault while not rebooting. We want the trace. */ 2091 BUG(); 2092 } 2093 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot); 2094 2095 static int kvm_reboot(struct notifier_block *notifier, unsigned long val, 2096 void *v) 2097 { 2098 if (val == SYS_RESTART) { 2099 /* 2100 * Some (well, at least mine) BIOSes hang on reboot if 2101 * in vmx root mode. 2102 */ 2103 printk(KERN_INFO "kvm: exiting hardware virtualization\n"); 2104 kvm_rebooting = true; 2105 on_each_cpu(hardware_disable, NULL, 1); 2106 } 2107 return NOTIFY_OK; 2108 } 2109 2110 static struct notifier_block kvm_reboot_notifier = { 2111 .notifier_call = kvm_reboot, 2112 .priority = 0, 2113 }; 2114 2115 void kvm_io_bus_init(struct kvm_io_bus *bus) 2116 { 2117 memset(bus, 0, sizeof(*bus)); 2118 } 2119 2120 void kvm_io_bus_destroy(struct kvm_io_bus *bus) 2121 { 2122 int i; 2123 2124 for (i = 0; i < bus->dev_count; i++) { 2125 struct kvm_io_device *pos = bus->devs[i]; 2126 2127 kvm_iodevice_destructor(pos); 2128 } 2129 } 2130 2131 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, 2132 gpa_t addr, int len, int is_write) 2133 { 2134 int i; 2135 2136 for (i = 0; i < bus->dev_count; i++) { 2137 struct kvm_io_device *pos = bus->devs[i]; 2138 2139 if (pos->in_range(pos, addr, len, is_write)) 2140 return pos; 2141 } 2142 2143 return NULL; 2144 } 2145 2146 void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev) 2147 { 2148 BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1)); 2149 2150 bus->devs[bus->dev_count++] = dev; 2151 } 2152 2153 static struct notifier_block kvm_cpu_notifier = { 2154 .notifier_call = kvm_cpu_hotplug, 2155 .priority = 20, /* must be > scheduler priority */ 2156 }; 2157 2158 static int vm_stat_get(void *_offset, u64 *val) 2159 { 2160 unsigned offset = (long)_offset; 2161 struct kvm *kvm; 2162 2163 *val = 0; 2164 spin_lock(&kvm_lock); 2165 list_for_each_entry(kvm, &vm_list, vm_list) 2166 *val += *(u32 *)((void *)kvm + offset); 2167 spin_unlock(&kvm_lock); 2168 return 0; 2169 } 2170 2171 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); 2172 2173 static int vcpu_stat_get(void *_offset, u64 *val) 2174 { 2175 unsigned offset = (long)_offset; 2176 struct kvm *kvm; 2177 struct kvm_vcpu *vcpu; 2178 int i; 2179 2180 *val = 0; 2181 spin_lock(&kvm_lock); 2182 list_for_each_entry(kvm, &vm_list, vm_list) 2183 for (i = 0; i < KVM_MAX_VCPUS; ++i) { 2184 vcpu = kvm->vcpus[i]; 2185 if (vcpu) 2186 *val += *(u32 *)((void *)vcpu + offset); 2187 } 2188 spin_unlock(&kvm_lock); 2189 return 0; 2190 } 2191 2192 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); 2193 2194 static struct file_operations *stat_fops[] = { 2195 [KVM_STAT_VCPU] = &vcpu_stat_fops, 2196 [KVM_STAT_VM] = &vm_stat_fops, 2197 }; 2198 2199 static void kvm_init_debug(void) 2200 { 2201 struct kvm_stats_debugfs_item *p; 2202 2203 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); 2204 for (p = debugfs_entries; p->name; ++p) 2205 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir, 2206 (void *)(long)p->offset, 2207 stat_fops[p->kind]); 2208 } 2209 2210 static void kvm_exit_debug(void) 2211 { 2212 struct kvm_stats_debugfs_item *p; 2213 2214 for (p = debugfs_entries; p->name; ++p) 2215 debugfs_remove(p->dentry); 2216 debugfs_remove(kvm_debugfs_dir); 2217 } 2218 2219 static int kvm_suspend(struct sys_device *dev, pm_message_t state) 2220 { 2221 hardware_disable(NULL); 2222 return 0; 2223 } 2224 2225 static int kvm_resume(struct sys_device *dev) 2226 { 2227 hardware_enable(NULL); 2228 return 0; 2229 } 2230 2231 static struct sysdev_class kvm_sysdev_class = { 2232 .name = "kvm", 2233 .suspend = kvm_suspend, 2234 .resume = kvm_resume, 2235 }; 2236 2237 static struct sys_device kvm_sysdev = { 2238 .id = 0, 2239 .cls = &kvm_sysdev_class, 2240 }; 2241 2242 struct page *bad_page; 2243 pfn_t bad_pfn; 2244 2245 static inline 2246 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) 2247 { 2248 return container_of(pn, struct kvm_vcpu, preempt_notifier); 2249 } 2250 2251 static void kvm_sched_in(struct preempt_notifier *pn, int cpu) 2252 { 2253 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); 2254 2255 kvm_arch_vcpu_load(vcpu, cpu); 2256 } 2257 2258 static void kvm_sched_out(struct preempt_notifier *pn, 2259 struct task_struct *next) 2260 { 2261 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); 2262 2263 kvm_arch_vcpu_put(vcpu); 2264 } 2265 2266 int kvm_init(void *opaque, unsigned int vcpu_size, 2267 struct module *module) 2268 { 2269 int r; 2270 int cpu; 2271 2272 kvm_init_debug(); 2273 2274 r = kvm_arch_init(opaque); 2275 if (r) 2276 goto out_fail; 2277 2278 bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO); 2279 2280 if (bad_page == NULL) { 2281 r = -ENOMEM; 2282 goto out; 2283 } 2284 2285 bad_pfn = page_to_pfn(bad_page); 2286 2287 if (!alloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { 2288 r = -ENOMEM; 2289 goto out_free_0; 2290 } 2291 2292 r = kvm_arch_hardware_setup(); 2293 if (r < 0) 2294 goto out_free_0a; 2295 2296 for_each_online_cpu(cpu) { 2297 smp_call_function_single(cpu, 2298 kvm_arch_check_processor_compat, 2299 &r, 1); 2300 if (r < 0) 2301 goto out_free_1; 2302 } 2303 2304 on_each_cpu(hardware_enable, NULL, 1); 2305 r = register_cpu_notifier(&kvm_cpu_notifier); 2306 if (r) 2307 goto out_free_2; 2308 register_reboot_notifier(&kvm_reboot_notifier); 2309 2310 r = sysdev_class_register(&kvm_sysdev_class); 2311 if (r) 2312 goto out_free_3; 2313 2314 r = sysdev_register(&kvm_sysdev); 2315 if (r) 2316 goto out_free_4; 2317 2318 /* A kmem cache lets us meet the alignment requirements of fx_save. */ 2319 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, 2320 __alignof__(struct kvm_vcpu), 2321 0, NULL); 2322 if (!kvm_vcpu_cache) { 2323 r = -ENOMEM; 2324 goto out_free_5; 2325 } 2326 2327 kvm_chardev_ops.owner = module; 2328 kvm_vm_fops.owner = module; 2329 kvm_vcpu_fops.owner = module; 2330 2331 r = misc_register(&kvm_dev); 2332 if (r) { 2333 printk(KERN_ERR "kvm: misc device register failed\n"); 2334 goto out_free; 2335 } 2336 2337 kvm_preempt_ops.sched_in = kvm_sched_in; 2338 kvm_preempt_ops.sched_out = kvm_sched_out; 2339 #ifndef CONFIG_X86 2340 msi2intx = 0; 2341 #endif 2342 2343 return 0; 2344 2345 out_free: 2346 kmem_cache_destroy(kvm_vcpu_cache); 2347 out_free_5: 2348 sysdev_unregister(&kvm_sysdev); 2349 out_free_4: 2350 sysdev_class_unregister(&kvm_sysdev_class); 2351 out_free_3: 2352 unregister_reboot_notifier(&kvm_reboot_notifier); 2353 unregister_cpu_notifier(&kvm_cpu_notifier); 2354 out_free_2: 2355 on_each_cpu(hardware_disable, NULL, 1); 2356 out_free_1: 2357 kvm_arch_hardware_unsetup(); 2358 out_free_0a: 2359 free_cpumask_var(cpus_hardware_enabled); 2360 out_free_0: 2361 __free_page(bad_page); 2362 out: 2363 kvm_arch_exit(); 2364 kvm_exit_debug(); 2365 out_fail: 2366 return r; 2367 } 2368 EXPORT_SYMBOL_GPL(kvm_init); 2369 2370 void kvm_exit(void) 2371 { 2372 kvm_trace_cleanup(); 2373 misc_deregister(&kvm_dev); 2374 kmem_cache_destroy(kvm_vcpu_cache); 2375 sysdev_unregister(&kvm_sysdev); 2376 sysdev_class_unregister(&kvm_sysdev_class); 2377 unregister_reboot_notifier(&kvm_reboot_notifier); 2378 unregister_cpu_notifier(&kvm_cpu_notifier); 2379 on_each_cpu(hardware_disable, NULL, 1); 2380 kvm_arch_hardware_unsetup(); 2381 kvm_arch_exit(); 2382 kvm_exit_debug(); 2383 free_cpumask_var(cpus_hardware_enabled); 2384 __free_page(bad_page); 2385 } 2386 EXPORT_SYMBOL_GPL(kvm_exit); 2387