| 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 | #include <linux/bitops.h> |
| 45 | #include <linux/spinlock.h> |
| 46 | |
| 47 | #include <asm/processor.h> |
| 48 | #include <asm/io.h> |
| 49 | #include <asm/uaccess.h> |
| 50 | #include <asm/pgtable.h> |
| 51 | |
| 52 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
| 53 | #include "coalesced_mmio.h" |
| 54 | #endif |
| 55 | |
| 56 | #ifdef KVM_CAP_DEVICE_ASSIGNMENT |
| 57 | #include <linux/pci.h> |
| 58 | #include <linux/interrupt.h> |
| 59 | #include "irq.h" |
| 60 | #endif |
| 61 | |
| 62 | #define CREATE_TRACE_POINTS |
| 63 | #include <trace/events/kvm.h> |
| 64 | |
| 65 | MODULE_AUTHOR("Qumranet"); |
| 66 | MODULE_LICENSE("GPL"); |
| 67 | |
| 68 | /* |
| 69 | * Ordering of locks: |
| 70 | * |
| 71 | * kvm->slots_lock --> kvm->lock --> kvm->irq_lock |
| 72 | */ |
| 73 | |
| 74 | DEFINE_SPINLOCK(kvm_lock); |
| 75 | LIST_HEAD(vm_list); |
| 76 | |
| 77 | static cpumask_var_t cpus_hardware_enabled; |
| 78 | |
| 79 | struct kmem_cache *kvm_vcpu_cache; |
| 80 | EXPORT_SYMBOL_GPL(kvm_vcpu_cache); |
| 81 | |
| 82 | static __read_mostly struct preempt_ops kvm_preempt_ops; |
| 83 | |
| 84 | struct dentry *kvm_debugfs_dir; |
| 85 | |
| 86 | static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, |
| 87 | unsigned long arg); |
| 88 | |
| 89 | static bool kvm_rebooting; |
| 90 | |
| 91 | static bool largepages_enabled = true; |
| 92 | |
| 93 | #ifdef KVM_CAP_DEVICE_ASSIGNMENT |
| 94 | static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head *head, |
| 95 | int assigned_dev_id) |
| 96 | { |
| 97 | struct list_head *ptr; |
| 98 | struct kvm_assigned_dev_kernel *match; |
| 99 | |
| 100 | list_for_each(ptr, head) { |
| 101 | match = list_entry(ptr, struct kvm_assigned_dev_kernel, list); |
| 102 | if (match->assigned_dev_id == assigned_dev_id) |
| 103 | return match; |
| 104 | } |
| 105 | return NULL; |
| 106 | } |
| 107 | |
| 108 | static int find_index_from_host_irq(struct kvm_assigned_dev_kernel |
| 109 | *assigned_dev, int irq) |
| 110 | { |
| 111 | int i, index; |
| 112 | struct msix_entry *host_msix_entries; |
| 113 | |
| 114 | host_msix_entries = assigned_dev->host_msix_entries; |
| 115 | |
| 116 | index = -1; |
| 117 | for (i = 0; i < assigned_dev->entries_nr; i++) |
| 118 | if (irq == host_msix_entries[i].vector) { |
| 119 | index = i; |
| 120 | break; |
| 121 | } |
| 122 | if (index < 0) { |
| 123 | printk(KERN_WARNING "Fail to find correlated MSI-X entry!\n"); |
| 124 | return 0; |
| 125 | } |
| 126 | |
| 127 | return index; |
| 128 | } |
| 129 | |
| 130 | static void kvm_assigned_dev_interrupt_work_handler(struct work_struct *work) |
| 131 | { |
| 132 | struct kvm_assigned_dev_kernel *assigned_dev; |
| 133 | struct kvm *kvm; |
| 134 | int i; |
| 135 | |
| 136 | assigned_dev = container_of(work, struct kvm_assigned_dev_kernel, |
| 137 | interrupt_work); |
| 138 | kvm = assigned_dev->kvm; |
| 139 | |
| 140 | mutex_lock(&kvm->irq_lock); |
| 141 | spin_lock_irq(&assigned_dev->assigned_dev_lock); |
| 142 | if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) { |
| 143 | struct kvm_guest_msix_entry *guest_entries = |
| 144 | assigned_dev->guest_msix_entries; |
| 145 | for (i = 0; i < assigned_dev->entries_nr; i++) { |
| 146 | if (!(guest_entries[i].flags & |
| 147 | KVM_ASSIGNED_MSIX_PENDING)) |
| 148 | continue; |
| 149 | guest_entries[i].flags &= ~KVM_ASSIGNED_MSIX_PENDING; |
| 150 | kvm_set_irq(assigned_dev->kvm, |
| 151 | assigned_dev->irq_source_id, |
| 152 | guest_entries[i].vector, 1); |
| 153 | } |
| 154 | } else |
| 155 | kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id, |
| 156 | assigned_dev->guest_irq, 1); |
| 157 | |
| 158 | spin_unlock_irq(&assigned_dev->assigned_dev_lock); |
| 159 | mutex_unlock(&assigned_dev->kvm->irq_lock); |
| 160 | } |
| 161 | |
| 162 | static irqreturn_t kvm_assigned_dev_intr(int irq, void *dev_id) |
| 163 | { |
| 164 | unsigned long flags; |
| 165 | struct kvm_assigned_dev_kernel *assigned_dev = |
| 166 | (struct kvm_assigned_dev_kernel *) dev_id; |
| 167 | |
| 168 | spin_lock_irqsave(&assigned_dev->assigned_dev_lock, flags); |
| 169 | if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) { |
| 170 | int index = find_index_from_host_irq(assigned_dev, irq); |
| 171 | if (index < 0) |
| 172 | goto out; |
| 173 | assigned_dev->guest_msix_entries[index].flags |= |
| 174 | KVM_ASSIGNED_MSIX_PENDING; |
| 175 | } |
| 176 | |
| 177 | schedule_work(&assigned_dev->interrupt_work); |
| 178 | |
| 179 | if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_GUEST_INTX) { |
| 180 | disable_irq_nosync(irq); |
| 181 | assigned_dev->host_irq_disabled = true; |
| 182 | } |
| 183 | |
| 184 | out: |
| 185 | spin_unlock_irqrestore(&assigned_dev->assigned_dev_lock, flags); |
| 186 | return IRQ_HANDLED; |
| 187 | } |
| 188 | |
| 189 | /* Ack the irq line for an assigned device */ |
| 190 | static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian) |
| 191 | { |
| 192 | struct kvm_assigned_dev_kernel *dev; |
| 193 | unsigned long flags; |
| 194 | |
| 195 | if (kian->gsi == -1) |
| 196 | return; |
| 197 | |
| 198 | dev = container_of(kian, struct kvm_assigned_dev_kernel, |
| 199 | ack_notifier); |
| 200 | |
| 201 | kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0); |
| 202 | |
| 203 | /* The guest irq may be shared so this ack may be |
| 204 | * from another device. |
| 205 | */ |
| 206 | spin_lock_irqsave(&dev->assigned_dev_lock, flags); |
| 207 | if (dev->host_irq_disabled) { |
| 208 | enable_irq(dev->host_irq); |
| 209 | dev->host_irq_disabled = false; |
| 210 | } |
| 211 | spin_unlock_irqrestore(&dev->assigned_dev_lock, flags); |
| 212 | } |
| 213 | |
| 214 | static void deassign_guest_irq(struct kvm *kvm, |
| 215 | struct kvm_assigned_dev_kernel *assigned_dev) |
| 216 | { |
| 217 | kvm_unregister_irq_ack_notifier(kvm, &assigned_dev->ack_notifier); |
| 218 | assigned_dev->ack_notifier.gsi = -1; |
| 219 | |
| 220 | if (assigned_dev->irq_source_id != -1) |
| 221 | kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id); |
| 222 | assigned_dev->irq_source_id = -1; |
| 223 | assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_GUEST_MASK); |
| 224 | } |
| 225 | |
| 226 | /* The function implicit hold kvm->lock mutex due to cancel_work_sync() */ |
| 227 | static void deassign_host_irq(struct kvm *kvm, |
| 228 | struct kvm_assigned_dev_kernel *assigned_dev) |
| 229 | { |
| 230 | /* |
| 231 | * In kvm_free_device_irq, cancel_work_sync return true if: |
| 232 | * 1. work is scheduled, and then cancelled. |
| 233 | * 2. work callback is executed. |
| 234 | * |
| 235 | * The first one ensured that the irq is disabled and no more events |
| 236 | * would happen. But for the second one, the irq may be enabled (e.g. |
| 237 | * for MSI). So we disable irq here to prevent further events. |
| 238 | * |
| 239 | * Notice this maybe result in nested disable if the interrupt type is |
| 240 | * INTx, but it's OK for we are going to free it. |
| 241 | * |
| 242 | * If this function is a part of VM destroy, please ensure that till |
| 243 | * now, the kvm state is still legal for probably we also have to wait |
| 244 | * interrupt_work done. |
| 245 | */ |
| 246 | if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) { |
| 247 | int i; |
| 248 | for (i = 0; i < assigned_dev->entries_nr; i++) |
| 249 | disable_irq_nosync(assigned_dev-> |
| 250 | host_msix_entries[i].vector); |
| 251 | |
| 252 | cancel_work_sync(&assigned_dev->interrupt_work); |
| 253 | |
| 254 | for (i = 0; i < assigned_dev->entries_nr; i++) |
| 255 | free_irq(assigned_dev->host_msix_entries[i].vector, |
| 256 | (void *)assigned_dev); |
| 257 | |
| 258 | assigned_dev->entries_nr = 0; |
| 259 | kfree(assigned_dev->host_msix_entries); |
| 260 | kfree(assigned_dev->guest_msix_entries); |
| 261 | pci_disable_msix(assigned_dev->dev); |
| 262 | } else { |
| 263 | /* Deal with MSI and INTx */ |
| 264 | disable_irq_nosync(assigned_dev->host_irq); |
| 265 | cancel_work_sync(&assigned_dev->interrupt_work); |
| 266 | |
| 267 | free_irq(assigned_dev->host_irq, (void *)assigned_dev); |
| 268 | |
| 269 | if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSI) |
| 270 | pci_disable_msi(assigned_dev->dev); |
| 271 | } |
| 272 | |
| 273 | assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_HOST_MASK); |
| 274 | } |
| 275 | |
| 276 | static int kvm_deassign_irq(struct kvm *kvm, |
| 277 | struct kvm_assigned_dev_kernel *assigned_dev, |
| 278 | unsigned long irq_requested_type) |
| 279 | { |
| 280 | unsigned long guest_irq_type, host_irq_type; |
| 281 | |
| 282 | if (!irqchip_in_kernel(kvm)) |
| 283 | return -EINVAL; |
| 284 | /* no irq assignment to deassign */ |
| 285 | if (!assigned_dev->irq_requested_type) |
| 286 | return -ENXIO; |
| 287 | |
| 288 | host_irq_type = irq_requested_type & KVM_DEV_IRQ_HOST_MASK; |
| 289 | guest_irq_type = irq_requested_type & KVM_DEV_IRQ_GUEST_MASK; |
| 290 | |
| 291 | if (host_irq_type) |
| 292 | deassign_host_irq(kvm, assigned_dev); |
| 293 | if (guest_irq_type) |
| 294 | deassign_guest_irq(kvm, assigned_dev); |
| 295 | |
| 296 | return 0; |
| 297 | } |
| 298 | |
| 299 | static void kvm_free_assigned_irq(struct kvm *kvm, |
| 300 | struct kvm_assigned_dev_kernel *assigned_dev) |
| 301 | { |
| 302 | kvm_deassign_irq(kvm, assigned_dev, assigned_dev->irq_requested_type); |
| 303 | } |
| 304 | |
| 305 | static void kvm_free_assigned_device(struct kvm *kvm, |
| 306 | struct kvm_assigned_dev_kernel |
| 307 | *assigned_dev) |
| 308 | { |
| 309 | kvm_free_assigned_irq(kvm, assigned_dev); |
| 310 | |
| 311 | pci_reset_function(assigned_dev->dev); |
| 312 | |
| 313 | pci_release_regions(assigned_dev->dev); |
| 314 | pci_disable_device(assigned_dev->dev); |
| 315 | pci_dev_put(assigned_dev->dev); |
| 316 | |
| 317 | list_del(&assigned_dev->list); |
| 318 | kfree(assigned_dev); |
| 319 | } |
| 320 | |
| 321 | void kvm_free_all_assigned_devices(struct kvm *kvm) |
| 322 | { |
| 323 | struct list_head *ptr, *ptr2; |
| 324 | struct kvm_assigned_dev_kernel *assigned_dev; |
| 325 | |
| 326 | list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) { |
| 327 | assigned_dev = list_entry(ptr, |
| 328 | struct kvm_assigned_dev_kernel, |
| 329 | list); |
| 330 | |
| 331 | kvm_free_assigned_device(kvm, assigned_dev); |
| 332 | } |
| 333 | } |
| 334 | |
| 335 | static int assigned_device_enable_host_intx(struct kvm *kvm, |
| 336 | struct kvm_assigned_dev_kernel *dev) |
| 337 | { |
| 338 | dev->host_irq = dev->dev->irq; |
| 339 | /* Even though this is PCI, we don't want to use shared |
| 340 | * interrupts. Sharing host devices with guest-assigned devices |
| 341 | * on the same interrupt line is not a happy situation: there |
| 342 | * are going to be long delays in accepting, acking, etc. |
| 343 | */ |
| 344 | if (request_irq(dev->host_irq, kvm_assigned_dev_intr, |
| 345 | 0, "kvm_assigned_intx_device", (void *)dev)) |
| 346 | return -EIO; |
| 347 | return 0; |
| 348 | } |
| 349 | |
| 350 | #ifdef __KVM_HAVE_MSI |
| 351 | static int assigned_device_enable_host_msi(struct kvm *kvm, |
| 352 | struct kvm_assigned_dev_kernel *dev) |
| 353 | { |
| 354 | int r; |
| 355 | |
| 356 | if (!dev->dev->msi_enabled) { |
| 357 | r = pci_enable_msi(dev->dev); |
| 358 | if (r) |
| 359 | return r; |
| 360 | } |
| 361 | |
| 362 | dev->host_irq = dev->dev->irq; |
| 363 | if (request_irq(dev->host_irq, kvm_assigned_dev_intr, 0, |
| 364 | "kvm_assigned_msi_device", (void *)dev)) { |
| 365 | pci_disable_msi(dev->dev); |
| 366 | return -EIO; |
| 367 | } |
| 368 | |
| 369 | return 0; |
| 370 | } |
| 371 | #endif |
| 372 | |
| 373 | #ifdef __KVM_HAVE_MSIX |
| 374 | static int assigned_device_enable_host_msix(struct kvm *kvm, |
| 375 | struct kvm_assigned_dev_kernel *dev) |
| 376 | { |
| 377 | int i, r = -EINVAL; |
| 378 | |
| 379 | /* host_msix_entries and guest_msix_entries should have been |
| 380 | * initialized */ |
| 381 | if (dev->entries_nr == 0) |
| 382 | return r; |
| 383 | |
| 384 | r = pci_enable_msix(dev->dev, dev->host_msix_entries, dev->entries_nr); |
| 385 | if (r) |
| 386 | return r; |
| 387 | |
| 388 | for (i = 0; i < dev->entries_nr; i++) { |
| 389 | r = request_irq(dev->host_msix_entries[i].vector, |
| 390 | kvm_assigned_dev_intr, 0, |
| 391 | "kvm_assigned_msix_device", |
| 392 | (void *)dev); |
| 393 | /* FIXME: free requested_irq's on failure */ |
| 394 | if (r) |
| 395 | return r; |
| 396 | } |
| 397 | |
| 398 | return 0; |
| 399 | } |
| 400 | |
| 401 | #endif |
| 402 | |
| 403 | static int assigned_device_enable_guest_intx(struct kvm *kvm, |
| 404 | struct kvm_assigned_dev_kernel *dev, |
| 405 | struct kvm_assigned_irq *irq) |
| 406 | { |
| 407 | dev->guest_irq = irq->guest_irq; |
| 408 | dev->ack_notifier.gsi = irq->guest_irq; |
| 409 | return 0; |
| 410 | } |
| 411 | |
| 412 | #ifdef __KVM_HAVE_MSI |
| 413 | static int assigned_device_enable_guest_msi(struct kvm *kvm, |
| 414 | struct kvm_assigned_dev_kernel *dev, |
| 415 | struct kvm_assigned_irq *irq) |
| 416 | { |
| 417 | dev->guest_irq = irq->guest_irq; |
| 418 | dev->ack_notifier.gsi = -1; |
| 419 | dev->host_irq_disabled = false; |
| 420 | return 0; |
| 421 | } |
| 422 | #endif |
| 423 | #ifdef __KVM_HAVE_MSIX |
| 424 | static int assigned_device_enable_guest_msix(struct kvm *kvm, |
| 425 | struct kvm_assigned_dev_kernel *dev, |
| 426 | struct kvm_assigned_irq *irq) |
| 427 | { |
| 428 | dev->guest_irq = irq->guest_irq; |
| 429 | dev->ack_notifier.gsi = -1; |
| 430 | dev->host_irq_disabled = false; |
| 431 | return 0; |
| 432 | } |
| 433 | #endif |
| 434 | |
| 435 | static int assign_host_irq(struct kvm *kvm, |
| 436 | struct kvm_assigned_dev_kernel *dev, |
| 437 | __u32 host_irq_type) |
| 438 | { |
| 439 | int r = -EEXIST; |
| 440 | |
| 441 | if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_MASK) |
| 442 | return r; |
| 443 | |
| 444 | switch (host_irq_type) { |
| 445 | case KVM_DEV_IRQ_HOST_INTX: |
| 446 | r = assigned_device_enable_host_intx(kvm, dev); |
| 447 | break; |
| 448 | #ifdef __KVM_HAVE_MSI |
| 449 | case KVM_DEV_IRQ_HOST_MSI: |
| 450 | r = assigned_device_enable_host_msi(kvm, dev); |
| 451 | break; |
| 452 | #endif |
| 453 | #ifdef __KVM_HAVE_MSIX |
| 454 | case KVM_DEV_IRQ_HOST_MSIX: |
| 455 | r = assigned_device_enable_host_msix(kvm, dev); |
| 456 | break; |
| 457 | #endif |
| 458 | default: |
| 459 | r = -EINVAL; |
| 460 | } |
| 461 | |
| 462 | if (!r) |
| 463 | dev->irq_requested_type |= host_irq_type; |
| 464 | |
| 465 | return r; |
| 466 | } |
| 467 | |
| 468 | static int assign_guest_irq(struct kvm *kvm, |
| 469 | struct kvm_assigned_dev_kernel *dev, |
| 470 | struct kvm_assigned_irq *irq, |
| 471 | unsigned long guest_irq_type) |
| 472 | { |
| 473 | int id; |
| 474 | int r = -EEXIST; |
| 475 | |
| 476 | if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK) |
| 477 | return r; |
| 478 | |
| 479 | id = kvm_request_irq_source_id(kvm); |
| 480 | if (id < 0) |
| 481 | return id; |
| 482 | |
| 483 | dev->irq_source_id = id; |
| 484 | |
| 485 | switch (guest_irq_type) { |
| 486 | case KVM_DEV_IRQ_GUEST_INTX: |
| 487 | r = assigned_device_enable_guest_intx(kvm, dev, irq); |
| 488 | break; |
| 489 | #ifdef __KVM_HAVE_MSI |
| 490 | case KVM_DEV_IRQ_GUEST_MSI: |
| 491 | r = assigned_device_enable_guest_msi(kvm, dev, irq); |
| 492 | break; |
| 493 | #endif |
| 494 | #ifdef __KVM_HAVE_MSIX |
| 495 | case KVM_DEV_IRQ_GUEST_MSIX: |
| 496 | r = assigned_device_enable_guest_msix(kvm, dev, irq); |
| 497 | break; |
| 498 | #endif |
| 499 | default: |
| 500 | r = -EINVAL; |
| 501 | } |
| 502 | |
| 503 | if (!r) { |
| 504 | dev->irq_requested_type |= guest_irq_type; |
| 505 | kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier); |
| 506 | } else |
| 507 | kvm_free_irq_source_id(kvm, dev->irq_source_id); |
| 508 | |
| 509 | return r; |
| 510 | } |
| 511 | |
| 512 | /* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */ |
| 513 | static int kvm_vm_ioctl_assign_irq(struct kvm *kvm, |
| 514 | struct kvm_assigned_irq *assigned_irq) |
| 515 | { |
| 516 | int r = -EINVAL; |
| 517 | struct kvm_assigned_dev_kernel *match; |
| 518 | unsigned long host_irq_type, guest_irq_type; |
| 519 | |
| 520 | if (!capable(CAP_SYS_RAWIO)) |
| 521 | return -EPERM; |
| 522 | |
| 523 | if (!irqchip_in_kernel(kvm)) |
| 524 | return r; |
| 525 | |
| 526 | mutex_lock(&kvm->lock); |
| 527 | r = -ENODEV; |
| 528 | match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, |
| 529 | assigned_irq->assigned_dev_id); |
| 530 | if (!match) |
| 531 | goto out; |
| 532 | |
| 533 | host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK); |
| 534 | guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK); |
| 535 | |
| 536 | r = -EINVAL; |
| 537 | /* can only assign one type at a time */ |
| 538 | if (hweight_long(host_irq_type) > 1) |
| 539 | goto out; |
| 540 | if (hweight_long(guest_irq_type) > 1) |
| 541 | goto out; |
| 542 | if (host_irq_type == 0 && guest_irq_type == 0) |
| 543 | goto out; |
| 544 | |
| 545 | r = 0; |
| 546 | if (host_irq_type) |
| 547 | r = assign_host_irq(kvm, match, host_irq_type); |
| 548 | if (r) |
| 549 | goto out; |
| 550 | |
| 551 | if (guest_irq_type) |
| 552 | r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type); |
| 553 | out: |
| 554 | mutex_unlock(&kvm->lock); |
| 555 | return r; |
| 556 | } |
| 557 | |
| 558 | static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm, |
| 559 | struct kvm_assigned_irq |
| 560 | *assigned_irq) |
| 561 | { |
| 562 | int r = -ENODEV; |
| 563 | struct kvm_assigned_dev_kernel *match; |
| 564 | |
| 565 | mutex_lock(&kvm->lock); |
| 566 | |
| 567 | match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, |
| 568 | assigned_irq->assigned_dev_id); |
| 569 | if (!match) |
| 570 | goto out; |
| 571 | |
| 572 | r = kvm_deassign_irq(kvm, match, assigned_irq->flags); |
| 573 | out: |
| 574 | mutex_unlock(&kvm->lock); |
| 575 | return r; |
| 576 | } |
| 577 | |
| 578 | static int kvm_vm_ioctl_assign_device(struct kvm *kvm, |
| 579 | struct kvm_assigned_pci_dev *assigned_dev) |
| 580 | { |
| 581 | int r = 0; |
| 582 | struct kvm_assigned_dev_kernel *match; |
| 583 | struct pci_dev *dev; |
| 584 | |
| 585 | down_read(&kvm->slots_lock); |
| 586 | mutex_lock(&kvm->lock); |
| 587 | |
| 588 | match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, |
| 589 | assigned_dev->assigned_dev_id); |
| 590 | if (match) { |
| 591 | /* device already assigned */ |
| 592 | r = -EEXIST; |
| 593 | goto out; |
| 594 | } |
| 595 | |
| 596 | match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL); |
| 597 | if (match == NULL) { |
| 598 | printk(KERN_INFO "%s: Couldn't allocate memory\n", |
| 599 | __func__); |
| 600 | r = -ENOMEM; |
| 601 | goto out; |
| 602 | } |
| 603 | dev = pci_get_bus_and_slot(assigned_dev->busnr, |
| 604 | assigned_dev->devfn); |
| 605 | if (!dev) { |
| 606 | printk(KERN_INFO "%s: host device not found\n", __func__); |
| 607 | r = -EINVAL; |
| 608 | goto out_free; |
| 609 | } |
| 610 | if (pci_enable_device(dev)) { |
| 611 | printk(KERN_INFO "%s: Could not enable PCI device\n", __func__); |
| 612 | r = -EBUSY; |
| 613 | goto out_put; |
| 614 | } |
| 615 | r = pci_request_regions(dev, "kvm_assigned_device"); |
| 616 | if (r) { |
| 617 | printk(KERN_INFO "%s: Could not get access to device regions\n", |
| 618 | __func__); |
| 619 | goto out_disable; |
| 620 | } |
| 621 | |
| 622 | pci_reset_function(dev); |
| 623 | |
| 624 | match->assigned_dev_id = assigned_dev->assigned_dev_id; |
| 625 | match->host_busnr = assigned_dev->busnr; |
| 626 | match->host_devfn = assigned_dev->devfn; |
| 627 | match->flags = assigned_dev->flags; |
| 628 | match->dev = dev; |
| 629 | spin_lock_init(&match->assigned_dev_lock); |
| 630 | match->irq_source_id = -1; |
| 631 | match->kvm = kvm; |
| 632 | match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq; |
| 633 | INIT_WORK(&match->interrupt_work, |
| 634 | kvm_assigned_dev_interrupt_work_handler); |
| 635 | |
| 636 | list_add(&match->list, &kvm->arch.assigned_dev_head); |
| 637 | |
| 638 | if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) { |
| 639 | if (!kvm->arch.iommu_domain) { |
| 640 | r = kvm_iommu_map_guest(kvm); |
| 641 | if (r) |
| 642 | goto out_list_del; |
| 643 | } |
| 644 | r = kvm_assign_device(kvm, match); |
| 645 | if (r) |
| 646 | goto out_list_del; |
| 647 | } |
| 648 | |
| 649 | out: |
| 650 | mutex_unlock(&kvm->lock); |
| 651 | up_read(&kvm->slots_lock); |
| 652 | return r; |
| 653 | out_list_del: |
| 654 | list_del(&match->list); |
| 655 | pci_release_regions(dev); |
| 656 | out_disable: |
| 657 | pci_disable_device(dev); |
| 658 | out_put: |
| 659 | pci_dev_put(dev); |
| 660 | out_free: |
| 661 | kfree(match); |
| 662 | mutex_unlock(&kvm->lock); |
| 663 | up_read(&kvm->slots_lock); |
| 664 | return r; |
| 665 | } |
| 666 | #endif |
| 667 | |
| 668 | #ifdef KVM_CAP_DEVICE_DEASSIGNMENT |
| 669 | static int kvm_vm_ioctl_deassign_device(struct kvm *kvm, |
| 670 | struct kvm_assigned_pci_dev *assigned_dev) |
| 671 | { |
| 672 | int r = 0; |
| 673 | struct kvm_assigned_dev_kernel *match; |
| 674 | |
| 675 | mutex_lock(&kvm->lock); |
| 676 | |
| 677 | match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, |
| 678 | assigned_dev->assigned_dev_id); |
| 679 | if (!match) { |
| 680 | printk(KERN_INFO "%s: device hasn't been assigned before, " |
| 681 | "so cannot be deassigned\n", __func__); |
| 682 | r = -EINVAL; |
| 683 | goto out; |
| 684 | } |
| 685 | |
| 686 | if (match->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) |
| 687 | kvm_deassign_device(kvm, match); |
| 688 | |
| 689 | kvm_free_assigned_device(kvm, match); |
| 690 | |
| 691 | out: |
| 692 | mutex_unlock(&kvm->lock); |
| 693 | return r; |
| 694 | } |
| 695 | #endif |
| 696 | |
| 697 | inline int kvm_is_mmio_pfn(pfn_t pfn) |
| 698 | { |
| 699 | if (pfn_valid(pfn)) { |
| 700 | struct page *page = compound_head(pfn_to_page(pfn)); |
| 701 | return PageReserved(page); |
| 702 | } |
| 703 | |
| 704 | return true; |
| 705 | } |
| 706 | |
| 707 | /* |
| 708 | * Switches to specified vcpu, until a matching vcpu_put() |
| 709 | */ |
| 710 | void vcpu_load(struct kvm_vcpu *vcpu) |
| 711 | { |
| 712 | int cpu; |
| 713 | |
| 714 | mutex_lock(&vcpu->mutex); |
| 715 | cpu = get_cpu(); |
| 716 | preempt_notifier_register(&vcpu->preempt_notifier); |
| 717 | kvm_arch_vcpu_load(vcpu, cpu); |
| 718 | put_cpu(); |
| 719 | } |
| 720 | |
| 721 | void vcpu_put(struct kvm_vcpu *vcpu) |
| 722 | { |
| 723 | preempt_disable(); |
| 724 | kvm_arch_vcpu_put(vcpu); |
| 725 | preempt_notifier_unregister(&vcpu->preempt_notifier); |
| 726 | preempt_enable(); |
| 727 | mutex_unlock(&vcpu->mutex); |
| 728 | } |
| 729 | |
| 730 | static void ack_flush(void *_completed) |
| 731 | { |
| 732 | } |
| 733 | |
| 734 | static bool make_all_cpus_request(struct kvm *kvm, unsigned int req) |
| 735 | { |
| 736 | int i, cpu, me; |
| 737 | cpumask_var_t cpus; |
| 738 | bool called = true; |
| 739 | struct kvm_vcpu *vcpu; |
| 740 | |
| 741 | if (alloc_cpumask_var(&cpus, GFP_ATOMIC)) |
| 742 | cpumask_clear(cpus); |
| 743 | |
| 744 | spin_lock(&kvm->requests_lock); |
| 745 | me = smp_processor_id(); |
| 746 | kvm_for_each_vcpu(i, vcpu, kvm) { |
| 747 | if (test_and_set_bit(req, &vcpu->requests)) |
| 748 | continue; |
| 749 | cpu = vcpu->cpu; |
| 750 | if (cpus != NULL && cpu != -1 && cpu != me) |
| 751 | cpumask_set_cpu(cpu, cpus); |
| 752 | } |
| 753 | if (unlikely(cpus == NULL)) |
| 754 | smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1); |
| 755 | else if (!cpumask_empty(cpus)) |
| 756 | smp_call_function_many(cpus, ack_flush, NULL, 1); |
| 757 | else |
| 758 | called = false; |
| 759 | spin_unlock(&kvm->requests_lock); |
| 760 | free_cpumask_var(cpus); |
| 761 | return called; |
| 762 | } |
| 763 | |
| 764 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
| 765 | { |
| 766 | if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) |
| 767 | ++kvm->stat.remote_tlb_flush; |
| 768 | } |
| 769 | |
| 770 | void kvm_reload_remote_mmus(struct kvm *kvm) |
| 771 | { |
| 772 | make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); |
| 773 | } |
| 774 | |
| 775 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
| 776 | { |
| 777 | struct page *page; |
| 778 | int r; |
| 779 | |
| 780 | mutex_init(&vcpu->mutex); |
| 781 | vcpu->cpu = -1; |
| 782 | vcpu->kvm = kvm; |
| 783 | vcpu->vcpu_id = id; |
| 784 | init_waitqueue_head(&vcpu->wq); |
| 785 | |
| 786 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
| 787 | if (!page) { |
| 788 | r = -ENOMEM; |
| 789 | goto fail; |
| 790 | } |
| 791 | vcpu->run = page_address(page); |
| 792 | |
| 793 | r = kvm_arch_vcpu_init(vcpu); |
| 794 | if (r < 0) |
| 795 | goto fail_free_run; |
| 796 | return 0; |
| 797 | |
| 798 | fail_free_run: |
| 799 | free_page((unsigned long)vcpu->run); |
| 800 | fail: |
| 801 | return r; |
| 802 | } |
| 803 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); |
| 804 | |
| 805 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) |
| 806 | { |
| 807 | kvm_arch_vcpu_uninit(vcpu); |
| 808 | free_page((unsigned long)vcpu->run); |
| 809 | } |
| 810 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); |
| 811 | |
| 812 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
| 813 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) |
| 814 | { |
| 815 | return container_of(mn, struct kvm, mmu_notifier); |
| 816 | } |
| 817 | |
| 818 | static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, |
| 819 | struct mm_struct *mm, |
| 820 | unsigned long address) |
| 821 | { |
| 822 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
| 823 | int need_tlb_flush; |
| 824 | |
| 825 | /* |
| 826 | * When ->invalidate_page runs, the linux pte has been zapped |
| 827 | * already but the page is still allocated until |
| 828 | * ->invalidate_page returns. So if we increase the sequence |
| 829 | * here the kvm page fault will notice if the spte can't be |
| 830 | * established because the page is going to be freed. If |
| 831 | * instead the kvm page fault establishes the spte before |
| 832 | * ->invalidate_page runs, kvm_unmap_hva will release it |
| 833 | * before returning. |
| 834 | * |
| 835 | * The sequence increase only need to be seen at spin_unlock |
| 836 | * time, and not at spin_lock time. |
| 837 | * |
| 838 | * Increasing the sequence after the spin_unlock would be |
| 839 | * unsafe because the kvm page fault could then establish the |
| 840 | * pte after kvm_unmap_hva returned, without noticing the page |
| 841 | * is going to be freed. |
| 842 | */ |
| 843 | spin_lock(&kvm->mmu_lock); |
| 844 | kvm->mmu_notifier_seq++; |
| 845 | need_tlb_flush = kvm_unmap_hva(kvm, address); |
| 846 | spin_unlock(&kvm->mmu_lock); |
| 847 | |
| 848 | /* we've to flush the tlb before the pages can be freed */ |
| 849 | if (need_tlb_flush) |
| 850 | kvm_flush_remote_tlbs(kvm); |
| 851 | |
| 852 | } |
| 853 | |
| 854 | static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
| 855 | struct mm_struct *mm, |
| 856 | unsigned long start, |
| 857 | unsigned long end) |
| 858 | { |
| 859 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
| 860 | int need_tlb_flush = 0; |
| 861 | |
| 862 | spin_lock(&kvm->mmu_lock); |
| 863 | /* |
| 864 | * The count increase must become visible at unlock time as no |
| 865 | * spte can be established without taking the mmu_lock and |
| 866 | * count is also read inside the mmu_lock critical section. |
| 867 | */ |
| 868 | kvm->mmu_notifier_count++; |
| 869 | for (; start < end; start += PAGE_SIZE) |
| 870 | need_tlb_flush |= kvm_unmap_hva(kvm, start); |
| 871 | spin_unlock(&kvm->mmu_lock); |
| 872 | |
| 873 | /* we've to flush the tlb before the pages can be freed */ |
| 874 | if (need_tlb_flush) |
| 875 | kvm_flush_remote_tlbs(kvm); |
| 876 | } |
| 877 | |
| 878 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, |
| 879 | struct mm_struct *mm, |
| 880 | unsigned long start, |
| 881 | unsigned long end) |
| 882 | { |
| 883 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
| 884 | |
| 885 | spin_lock(&kvm->mmu_lock); |
| 886 | /* |
| 887 | * This sequence increase will notify the kvm page fault that |
| 888 | * the page that is going to be mapped in the spte could have |
| 889 | * been freed. |
| 890 | */ |
| 891 | kvm->mmu_notifier_seq++; |
| 892 | /* |
| 893 | * The above sequence increase must be visible before the |
| 894 | * below count decrease but both values are read by the kvm |
| 895 | * page fault under mmu_lock spinlock so we don't need to add |
| 896 | * a smb_wmb() here in between the two. |
| 897 | */ |
| 898 | kvm->mmu_notifier_count--; |
| 899 | spin_unlock(&kvm->mmu_lock); |
| 900 | |
| 901 | BUG_ON(kvm->mmu_notifier_count < 0); |
| 902 | } |
| 903 | |
| 904 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, |
| 905 | struct mm_struct *mm, |
| 906 | unsigned long address) |
| 907 | { |
| 908 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
| 909 | int young; |
| 910 | |
| 911 | spin_lock(&kvm->mmu_lock); |
| 912 | young = kvm_age_hva(kvm, address); |
| 913 | spin_unlock(&kvm->mmu_lock); |
| 914 | |
| 915 | if (young) |
| 916 | kvm_flush_remote_tlbs(kvm); |
| 917 | |
| 918 | return young; |
| 919 | } |
| 920 | |
| 921 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
| 922 | struct mm_struct *mm) |
| 923 | { |
| 924 | struct kvm *kvm = mmu_notifier_to_kvm(mn); |
| 925 | kvm_arch_flush_shadow(kvm); |
| 926 | } |
| 927 | |
| 928 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
| 929 | .invalidate_page = kvm_mmu_notifier_invalidate_page, |
| 930 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, |
| 931 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, |
| 932 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, |
| 933 | .release = kvm_mmu_notifier_release, |
| 934 | }; |
| 935 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ |
| 936 | |
| 937 | static struct kvm *kvm_create_vm(void) |
| 938 | { |
| 939 | struct kvm *kvm = kvm_arch_create_vm(); |
| 940 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
| 941 | struct page *page; |
| 942 | #endif |
| 943 | |
| 944 | if (IS_ERR(kvm)) |
| 945 | goto out; |
| 946 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
| 947 | INIT_LIST_HEAD(&kvm->irq_routing); |
| 948 | INIT_HLIST_HEAD(&kvm->mask_notifier_list); |
| 949 | #endif |
| 950 | |
| 951 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
| 952 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
| 953 | if (!page) { |
| 954 | kfree(kvm); |
| 955 | return ERR_PTR(-ENOMEM); |
| 956 | } |
| 957 | kvm->coalesced_mmio_ring = |
| 958 | (struct kvm_coalesced_mmio_ring *)page_address(page); |
| 959 | #endif |
| 960 | |
| 961 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
| 962 | { |
| 963 | int err; |
| 964 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; |
| 965 | err = mmu_notifier_register(&kvm->mmu_notifier, current->mm); |
| 966 | if (err) { |
| 967 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
| 968 | put_page(page); |
| 969 | #endif |
| 970 | kfree(kvm); |
| 971 | return ERR_PTR(err); |
| 972 | } |
| 973 | } |
| 974 | #endif |
| 975 | |
| 976 | kvm->mm = current->mm; |
| 977 | atomic_inc(&kvm->mm->mm_count); |
| 978 | spin_lock_init(&kvm->mmu_lock); |
| 979 | spin_lock_init(&kvm->requests_lock); |
| 980 | kvm_io_bus_init(&kvm->pio_bus); |
| 981 | kvm_eventfd_init(kvm); |
| 982 | mutex_init(&kvm->lock); |
| 983 | mutex_init(&kvm->irq_lock); |
| 984 | kvm_io_bus_init(&kvm->mmio_bus); |
| 985 | init_rwsem(&kvm->slots_lock); |
| 986 | atomic_set(&kvm->users_count, 1); |
| 987 | spin_lock(&kvm_lock); |
| 988 | list_add(&kvm->vm_list, &vm_list); |
| 989 | spin_unlock(&kvm_lock); |
| 990 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
| 991 | kvm_coalesced_mmio_init(kvm); |
| 992 | #endif |
| 993 | out: |
| 994 | return kvm; |
| 995 | } |
| 996 | |
| 997 | /* |
| 998 | * Free any memory in @free but not in @dont. |
| 999 | */ |
| 1000 | static void kvm_free_physmem_slot(struct kvm_memory_slot *free, |
| 1001 | struct kvm_memory_slot *dont) |
| 1002 | { |
| 1003 | int i; |
| 1004 | |
| 1005 | if (!dont || free->rmap != dont->rmap) |
| 1006 | vfree(free->rmap); |
| 1007 | |
| 1008 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) |
| 1009 | vfree(free->dirty_bitmap); |
| 1010 | |
| 1011 | |
| 1012 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { |
| 1013 | if (!dont || free->lpage_info[i] != dont->lpage_info[i]) { |
| 1014 | vfree(free->lpage_info[i]); |
| 1015 | free->lpage_info[i] = NULL; |
| 1016 | } |
| 1017 | } |
| 1018 | |
| 1019 | free->npages = 0; |
| 1020 | free->dirty_bitmap = NULL; |
| 1021 | free->rmap = NULL; |
| 1022 | } |
| 1023 | |
| 1024 | void kvm_free_physmem(struct kvm *kvm) |
| 1025 | { |
| 1026 | int i; |
| 1027 | |
| 1028 | for (i = 0; i < kvm->nmemslots; ++i) |
| 1029 | kvm_free_physmem_slot(&kvm->memslots[i], NULL); |
| 1030 | } |
| 1031 | |
| 1032 | static void kvm_destroy_vm(struct kvm *kvm) |
| 1033 | { |
| 1034 | struct mm_struct *mm = kvm->mm; |
| 1035 | |
| 1036 | kvm_arch_sync_events(kvm); |
| 1037 | spin_lock(&kvm_lock); |
| 1038 | list_del(&kvm->vm_list); |
| 1039 | spin_unlock(&kvm_lock); |
| 1040 | kvm_free_irq_routing(kvm); |
| 1041 | kvm_io_bus_destroy(&kvm->pio_bus); |
| 1042 | kvm_io_bus_destroy(&kvm->mmio_bus); |
| 1043 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
| 1044 | if (kvm->coalesced_mmio_ring != NULL) |
| 1045 | free_page((unsigned long)kvm->coalesced_mmio_ring); |
| 1046 | #endif |
| 1047 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
| 1048 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); |
| 1049 | #else |
| 1050 | kvm_arch_flush_shadow(kvm); |
| 1051 | #endif |
| 1052 | kvm_arch_destroy_vm(kvm); |
| 1053 | mmdrop(mm); |
| 1054 | } |
| 1055 | |
| 1056 | void kvm_get_kvm(struct kvm *kvm) |
| 1057 | { |
| 1058 | atomic_inc(&kvm->users_count); |
| 1059 | } |
| 1060 | EXPORT_SYMBOL_GPL(kvm_get_kvm); |
| 1061 | |
| 1062 | void kvm_put_kvm(struct kvm *kvm) |
| 1063 | { |
| 1064 | if (atomic_dec_and_test(&kvm->users_count)) |
| 1065 | kvm_destroy_vm(kvm); |
| 1066 | } |
| 1067 | EXPORT_SYMBOL_GPL(kvm_put_kvm); |
| 1068 | |
| 1069 | |
| 1070 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
| 1071 | { |
| 1072 | struct kvm *kvm = filp->private_data; |
| 1073 | |
| 1074 | kvm_irqfd_release(kvm); |
| 1075 | |
| 1076 | kvm_put_kvm(kvm); |
| 1077 | return 0; |
| 1078 | } |
| 1079 | |
| 1080 | /* |
| 1081 | * Allocate some memory and give it an address in the guest physical address |
| 1082 | * space. |
| 1083 | * |
| 1084 | * Discontiguous memory is allowed, mostly for framebuffers. |
| 1085 | * |
| 1086 | * Must be called holding mmap_sem for write. |
| 1087 | */ |
| 1088 | int __kvm_set_memory_region(struct kvm *kvm, |
| 1089 | struct kvm_userspace_memory_region *mem, |
| 1090 | int user_alloc) |
| 1091 | { |
| 1092 | int r; |
| 1093 | gfn_t base_gfn; |
| 1094 | unsigned long npages; |
| 1095 | unsigned long i; |
| 1096 | struct kvm_memory_slot *memslot; |
| 1097 | struct kvm_memory_slot old, new; |
| 1098 | |
| 1099 | r = -EINVAL; |
| 1100 | /* General sanity checks */ |
| 1101 | if (mem->memory_size & (PAGE_SIZE - 1)) |
| 1102 | goto out; |
| 1103 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) |
| 1104 | goto out; |
| 1105 | if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1))) |
| 1106 | goto out; |
| 1107 | if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS) |
| 1108 | goto out; |
| 1109 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) |
| 1110 | goto out; |
| 1111 | |
| 1112 | memslot = &kvm->memslots[mem->slot]; |
| 1113 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
| 1114 | npages = mem->memory_size >> PAGE_SHIFT; |
| 1115 | |
| 1116 | if (!npages) |
| 1117 | mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; |
| 1118 | |
| 1119 | new = old = *memslot; |
| 1120 | |
| 1121 | new.base_gfn = base_gfn; |
| 1122 | new.npages = npages; |
| 1123 | new.flags = mem->flags; |
| 1124 | |
| 1125 | /* Disallow changing a memory slot's size. */ |
| 1126 | r = -EINVAL; |
| 1127 | if (npages && old.npages && npages != old.npages) |
| 1128 | goto out_free; |
| 1129 | |
| 1130 | /* Check for overlaps */ |
| 1131 | r = -EEXIST; |
| 1132 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { |
| 1133 | struct kvm_memory_slot *s = &kvm->memslots[i]; |
| 1134 | |
| 1135 | if (s == memslot || !s->npages) |
| 1136 | continue; |
| 1137 | if (!((base_gfn + npages <= s->base_gfn) || |
| 1138 | (base_gfn >= s->base_gfn + s->npages))) |
| 1139 | goto out_free; |
| 1140 | } |
| 1141 | |
| 1142 | /* Free page dirty bitmap if unneeded */ |
| 1143 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) |
| 1144 | new.dirty_bitmap = NULL; |
| 1145 | |
| 1146 | r = -ENOMEM; |
| 1147 | |
| 1148 | /* Allocate if a slot is being created */ |
| 1149 | #ifndef CONFIG_S390 |
| 1150 | if (npages && !new.rmap) { |
| 1151 | new.rmap = vmalloc(npages * sizeof(struct page *)); |
| 1152 | |
| 1153 | if (!new.rmap) |
| 1154 | goto out_free; |
| 1155 | |
| 1156 | memset(new.rmap, 0, npages * sizeof(*new.rmap)); |
| 1157 | |
| 1158 | new.user_alloc = user_alloc; |
| 1159 | /* |
| 1160 | * hva_to_rmmap() serialzies with the mmu_lock and to be |
| 1161 | * safe it has to ignore memslots with !user_alloc && |
| 1162 | * !userspace_addr. |
| 1163 | */ |
| 1164 | if (user_alloc) |
| 1165 | new.userspace_addr = mem->userspace_addr; |
| 1166 | else |
| 1167 | new.userspace_addr = 0; |
| 1168 | } |
| 1169 | if (!npages) |
| 1170 | goto skip_lpage; |
| 1171 | |
| 1172 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { |
| 1173 | unsigned long ugfn; |
| 1174 | unsigned long j; |
| 1175 | int lpages; |
| 1176 | int level = i + 2; |
| 1177 | |
| 1178 | /* Avoid unused variable warning if no large pages */ |
| 1179 | (void)level; |
| 1180 | |
| 1181 | if (new.lpage_info[i]) |
| 1182 | continue; |
| 1183 | |
| 1184 | lpages = 1 + (base_gfn + npages - 1) / |
| 1185 | KVM_PAGES_PER_HPAGE(level); |
| 1186 | lpages -= base_gfn / KVM_PAGES_PER_HPAGE(level); |
| 1187 | |
| 1188 | new.lpage_info[i] = vmalloc(lpages * sizeof(*new.lpage_info[i])); |
| 1189 | |
| 1190 | if (!new.lpage_info[i]) |
| 1191 | goto out_free; |
| 1192 | |
| 1193 | memset(new.lpage_info[i], 0, |
| 1194 | lpages * sizeof(*new.lpage_info[i])); |
| 1195 | |
| 1196 | if (base_gfn % KVM_PAGES_PER_HPAGE(level)) |
| 1197 | new.lpage_info[i][0].write_count = 1; |
| 1198 | if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE(level)) |
| 1199 | new.lpage_info[i][lpages - 1].write_count = 1; |
| 1200 | ugfn = new.userspace_addr >> PAGE_SHIFT; |
| 1201 | /* |
| 1202 | * If the gfn and userspace address are not aligned wrt each |
| 1203 | * other, or if explicitly asked to, disable large page |
| 1204 | * support for this slot |
| 1205 | */ |
| 1206 | if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) || |
| 1207 | !largepages_enabled) |
| 1208 | for (j = 0; j < lpages; ++j) |
| 1209 | new.lpage_info[i][j].write_count = 1; |
| 1210 | } |
| 1211 | |
| 1212 | skip_lpage: |
| 1213 | |
| 1214 | /* Allocate page dirty bitmap if needed */ |
| 1215 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { |
| 1216 | unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8; |
| 1217 | |
| 1218 | new.dirty_bitmap = vmalloc(dirty_bytes); |
| 1219 | if (!new.dirty_bitmap) |
| 1220 | goto out_free; |
| 1221 | memset(new.dirty_bitmap, 0, dirty_bytes); |
| 1222 | if (old.npages) |
| 1223 | kvm_arch_flush_shadow(kvm); |
| 1224 | } |
| 1225 | #else /* not defined CONFIG_S390 */ |
| 1226 | new.user_alloc = user_alloc; |
| 1227 | if (user_alloc) |
| 1228 | new.userspace_addr = mem->userspace_addr; |
| 1229 | #endif /* not defined CONFIG_S390 */ |
| 1230 | |
| 1231 | if (!npages) |
| 1232 | kvm_arch_flush_shadow(kvm); |
| 1233 | |
| 1234 | spin_lock(&kvm->mmu_lock); |
| 1235 | if (mem->slot >= kvm->nmemslots) |
| 1236 | kvm->nmemslots = mem->slot + 1; |
| 1237 | |
| 1238 | *memslot = new; |
| 1239 | spin_unlock(&kvm->mmu_lock); |
| 1240 | |
| 1241 | r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc); |
| 1242 | if (r) { |
| 1243 | spin_lock(&kvm->mmu_lock); |
| 1244 | *memslot = old; |
| 1245 | spin_unlock(&kvm->mmu_lock); |
| 1246 | goto out_free; |
| 1247 | } |
| 1248 | |
| 1249 | kvm_free_physmem_slot(&old, npages ? &new : NULL); |
| 1250 | /* Slot deletion case: we have to update the current slot */ |
| 1251 | spin_lock(&kvm->mmu_lock); |
| 1252 | if (!npages) |
| 1253 | *memslot = old; |
| 1254 | spin_unlock(&kvm->mmu_lock); |
| 1255 | #ifdef CONFIG_DMAR |
| 1256 | /* map the pages in iommu page table */ |
| 1257 | r = kvm_iommu_map_pages(kvm, base_gfn, npages); |
| 1258 | if (r) |
| 1259 | goto out; |
| 1260 | #endif |
| 1261 | return 0; |
| 1262 | |
| 1263 | out_free: |
| 1264 | kvm_free_physmem_slot(&new, &old); |
| 1265 | out: |
| 1266 | return r; |
| 1267 | |
| 1268 | } |
| 1269 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
| 1270 | |
| 1271 | int kvm_set_memory_region(struct kvm *kvm, |
| 1272 | struct kvm_userspace_memory_region *mem, |
| 1273 | int user_alloc) |
| 1274 | { |
| 1275 | int r; |
| 1276 | |
| 1277 | down_write(&kvm->slots_lock); |
| 1278 | r = __kvm_set_memory_region(kvm, mem, user_alloc); |
| 1279 | up_write(&kvm->slots_lock); |
| 1280 | return r; |
| 1281 | } |
| 1282 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
| 1283 | |
| 1284 | int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
| 1285 | struct |
| 1286 | kvm_userspace_memory_region *mem, |
| 1287 | int user_alloc) |
| 1288 | { |
| 1289 | if (mem->slot >= KVM_MEMORY_SLOTS) |
| 1290 | return -EINVAL; |
| 1291 | return kvm_set_memory_region(kvm, mem, user_alloc); |
| 1292 | } |
| 1293 | |
| 1294 | int kvm_get_dirty_log(struct kvm *kvm, |
| 1295 | struct kvm_dirty_log *log, int *is_dirty) |
| 1296 | { |
| 1297 | struct kvm_memory_slot *memslot; |
| 1298 | int r, i; |
| 1299 | int n; |
| 1300 | unsigned long any = 0; |
| 1301 | |
| 1302 | r = -EINVAL; |
| 1303 | if (log->slot >= KVM_MEMORY_SLOTS) |
| 1304 | goto out; |
| 1305 | |
| 1306 | memslot = &kvm->memslots[log->slot]; |
| 1307 | r = -ENOENT; |
| 1308 | if (!memslot->dirty_bitmap) |
| 1309 | goto out; |
| 1310 | |
| 1311 | n = ALIGN(memslot->npages, BITS_PER_LONG) / 8; |
| 1312 | |
| 1313 | for (i = 0; !any && i < n/sizeof(long); ++i) |
| 1314 | any = memslot->dirty_bitmap[i]; |
| 1315 | |
| 1316 | r = -EFAULT; |
| 1317 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) |
| 1318 | goto out; |
| 1319 | |
| 1320 | if (any) |
| 1321 | *is_dirty = 1; |
| 1322 | |
| 1323 | r = 0; |
| 1324 | out: |
| 1325 | return r; |
| 1326 | } |
| 1327 | |
| 1328 | void kvm_disable_largepages(void) |
| 1329 | { |
| 1330 | largepages_enabled = false; |
| 1331 | } |
| 1332 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); |
| 1333 | |
| 1334 | int is_error_page(struct page *page) |
| 1335 | { |
| 1336 | return page == bad_page; |
| 1337 | } |
| 1338 | EXPORT_SYMBOL_GPL(is_error_page); |
| 1339 | |
| 1340 | int is_error_pfn(pfn_t pfn) |
| 1341 | { |
| 1342 | return pfn == bad_pfn; |
| 1343 | } |
| 1344 | EXPORT_SYMBOL_GPL(is_error_pfn); |
| 1345 | |
| 1346 | static inline unsigned long bad_hva(void) |
| 1347 | { |
| 1348 | return PAGE_OFFSET; |
| 1349 | } |
| 1350 | |
| 1351 | int kvm_is_error_hva(unsigned long addr) |
| 1352 | { |
| 1353 | return addr == bad_hva(); |
| 1354 | } |
| 1355 | EXPORT_SYMBOL_GPL(kvm_is_error_hva); |
| 1356 | |
| 1357 | struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn) |
| 1358 | { |
| 1359 | int i; |
| 1360 | |
| 1361 | for (i = 0; i < kvm->nmemslots; ++i) { |
| 1362 | struct kvm_memory_slot *memslot = &kvm->memslots[i]; |
| 1363 | |
| 1364 | if (gfn >= memslot->base_gfn |
| 1365 | && gfn < memslot->base_gfn + memslot->npages) |
| 1366 | return memslot; |
| 1367 | } |
| 1368 | return NULL; |
| 1369 | } |
| 1370 | EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased); |
| 1371 | |
| 1372 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) |
| 1373 | { |
| 1374 | gfn = unalias_gfn(kvm, gfn); |
| 1375 | return gfn_to_memslot_unaliased(kvm, gfn); |
| 1376 | } |
| 1377 | |
| 1378 | int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
| 1379 | { |
| 1380 | int i; |
| 1381 | |
| 1382 | gfn = unalias_gfn(kvm, gfn); |
| 1383 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { |
| 1384 | struct kvm_memory_slot *memslot = &kvm->memslots[i]; |
| 1385 | |
| 1386 | if (gfn >= memslot->base_gfn |
| 1387 | && gfn < memslot->base_gfn + memslot->npages) |
| 1388 | return 1; |
| 1389 | } |
| 1390 | return 0; |
| 1391 | } |
| 1392 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); |
| 1393 | |
| 1394 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) |
| 1395 | { |
| 1396 | struct kvm_memory_slot *slot; |
| 1397 | |
| 1398 | gfn = unalias_gfn(kvm, gfn); |
| 1399 | slot = gfn_to_memslot_unaliased(kvm, gfn); |
| 1400 | if (!slot) |
| 1401 | return bad_hva(); |
| 1402 | return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE); |
| 1403 | } |
| 1404 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
| 1405 | |
| 1406 | pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
| 1407 | { |
| 1408 | struct page *page[1]; |
| 1409 | unsigned long addr; |
| 1410 | int npages; |
| 1411 | pfn_t pfn; |
| 1412 | |
| 1413 | might_sleep(); |
| 1414 | |
| 1415 | addr = gfn_to_hva(kvm, gfn); |
| 1416 | if (kvm_is_error_hva(addr)) { |
| 1417 | get_page(bad_page); |
| 1418 | return page_to_pfn(bad_page); |
| 1419 | } |
| 1420 | |
| 1421 | npages = get_user_pages_fast(addr, 1, 1, page); |
| 1422 | |
| 1423 | if (unlikely(npages != 1)) { |
| 1424 | struct vm_area_struct *vma; |
| 1425 | |
| 1426 | down_read(¤t->mm->mmap_sem); |
| 1427 | vma = find_vma(current->mm, addr); |
| 1428 | |
| 1429 | if (vma == NULL || addr < vma->vm_start || |
| 1430 | !(vma->vm_flags & VM_PFNMAP)) { |
| 1431 | up_read(¤t->mm->mmap_sem); |
| 1432 | get_page(bad_page); |
| 1433 | return page_to_pfn(bad_page); |
| 1434 | } |
| 1435 | |
| 1436 | pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff; |
| 1437 | up_read(¤t->mm->mmap_sem); |
| 1438 | BUG_ON(!kvm_is_mmio_pfn(pfn)); |
| 1439 | } else |
| 1440 | pfn = page_to_pfn(page[0]); |
| 1441 | |
| 1442 | return pfn; |
| 1443 | } |
| 1444 | |
| 1445 | EXPORT_SYMBOL_GPL(gfn_to_pfn); |
| 1446 | |
| 1447 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) |
| 1448 | { |
| 1449 | pfn_t pfn; |
| 1450 | |
| 1451 | pfn = gfn_to_pfn(kvm, gfn); |
| 1452 | if (!kvm_is_mmio_pfn(pfn)) |
| 1453 | return pfn_to_page(pfn); |
| 1454 | |
| 1455 | WARN_ON(kvm_is_mmio_pfn(pfn)); |
| 1456 | |
| 1457 | get_page(bad_page); |
| 1458 | return bad_page; |
| 1459 | } |
| 1460 | |
| 1461 | EXPORT_SYMBOL_GPL(gfn_to_page); |
| 1462 | |
| 1463 | void kvm_release_page_clean(struct page *page) |
| 1464 | { |
| 1465 | kvm_release_pfn_clean(page_to_pfn(page)); |
| 1466 | } |
| 1467 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); |
| 1468 | |
| 1469 | void kvm_release_pfn_clean(pfn_t pfn) |
| 1470 | { |
| 1471 | if (!kvm_is_mmio_pfn(pfn)) |
| 1472 | put_page(pfn_to_page(pfn)); |
| 1473 | } |
| 1474 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); |
| 1475 | |
| 1476 | void kvm_release_page_dirty(struct page *page) |
| 1477 | { |
| 1478 | kvm_release_pfn_dirty(page_to_pfn(page)); |
| 1479 | } |
| 1480 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); |
| 1481 | |
| 1482 | void kvm_release_pfn_dirty(pfn_t pfn) |
| 1483 | { |
| 1484 | kvm_set_pfn_dirty(pfn); |
| 1485 | kvm_release_pfn_clean(pfn); |
| 1486 | } |
| 1487 | EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); |
| 1488 | |
| 1489 | void kvm_set_page_dirty(struct page *page) |
| 1490 | { |
| 1491 | kvm_set_pfn_dirty(page_to_pfn(page)); |
| 1492 | } |
| 1493 | EXPORT_SYMBOL_GPL(kvm_set_page_dirty); |
| 1494 | |
| 1495 | void kvm_set_pfn_dirty(pfn_t pfn) |
| 1496 | { |
| 1497 | if (!kvm_is_mmio_pfn(pfn)) { |
| 1498 | struct page *page = pfn_to_page(pfn); |
| 1499 | if (!PageReserved(page)) |
| 1500 | SetPageDirty(page); |
| 1501 | } |
| 1502 | } |
| 1503 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
| 1504 | |
| 1505 | void kvm_set_pfn_accessed(pfn_t pfn) |
| 1506 | { |
| 1507 | if (!kvm_is_mmio_pfn(pfn)) |
| 1508 | mark_page_accessed(pfn_to_page(pfn)); |
| 1509 | } |
| 1510 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); |
| 1511 | |
| 1512 | void kvm_get_pfn(pfn_t pfn) |
| 1513 | { |
| 1514 | if (!kvm_is_mmio_pfn(pfn)) |
| 1515 | get_page(pfn_to_page(pfn)); |
| 1516 | } |
| 1517 | EXPORT_SYMBOL_GPL(kvm_get_pfn); |
| 1518 | |
| 1519 | static int next_segment(unsigned long len, int offset) |
| 1520 | { |
| 1521 | if (len > PAGE_SIZE - offset) |
| 1522 | return PAGE_SIZE - offset; |
| 1523 | else |
| 1524 | return len; |
| 1525 | } |
| 1526 | |
| 1527 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, |
| 1528 | int len) |
| 1529 | { |
| 1530 | int r; |
| 1531 | unsigned long addr; |
| 1532 | |
| 1533 | addr = gfn_to_hva(kvm, gfn); |
| 1534 | if (kvm_is_error_hva(addr)) |
| 1535 | return -EFAULT; |
| 1536 | r = copy_from_user(data, (void __user *)addr + offset, len); |
| 1537 | if (r) |
| 1538 | return -EFAULT; |
| 1539 | return 0; |
| 1540 | } |
| 1541 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); |
| 1542 | |
| 1543 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) |
| 1544 | { |
| 1545 | gfn_t gfn = gpa >> PAGE_SHIFT; |
| 1546 | int seg; |
| 1547 | int offset = offset_in_page(gpa); |
| 1548 | int ret; |
| 1549 | |
| 1550 | while ((seg = next_segment(len, offset)) != 0) { |
| 1551 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); |
| 1552 | if (ret < 0) |
| 1553 | return ret; |
| 1554 | offset = 0; |
| 1555 | len -= seg; |
| 1556 | data += seg; |
| 1557 | ++gfn; |
| 1558 | } |
| 1559 | return 0; |
| 1560 | } |
| 1561 | EXPORT_SYMBOL_GPL(kvm_read_guest); |
| 1562 | |
| 1563 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
| 1564 | unsigned long len) |
| 1565 | { |
| 1566 | int r; |
| 1567 | unsigned long addr; |
| 1568 | gfn_t gfn = gpa >> PAGE_SHIFT; |
| 1569 | int offset = offset_in_page(gpa); |
| 1570 | |
| 1571 | addr = gfn_to_hva(kvm, gfn); |
| 1572 | if (kvm_is_error_hva(addr)) |
| 1573 | return -EFAULT; |
| 1574 | pagefault_disable(); |
| 1575 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); |
| 1576 | pagefault_enable(); |
| 1577 | if (r) |
| 1578 | return -EFAULT; |
| 1579 | return 0; |
| 1580 | } |
| 1581 | EXPORT_SYMBOL(kvm_read_guest_atomic); |
| 1582 | |
| 1583 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, |
| 1584 | int offset, int len) |
| 1585 | { |
| 1586 | int r; |
| 1587 | unsigned long addr; |
| 1588 | |
| 1589 | addr = gfn_to_hva(kvm, gfn); |
| 1590 | if (kvm_is_error_hva(addr)) |
| 1591 | return -EFAULT; |
| 1592 | r = copy_to_user((void __user *)addr + offset, data, len); |
| 1593 | if (r) |
| 1594 | return -EFAULT; |
| 1595 | mark_page_dirty(kvm, gfn); |
| 1596 | return 0; |
| 1597 | } |
| 1598 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); |
| 1599 | |
| 1600 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, |
| 1601 | unsigned long len) |
| 1602 | { |
| 1603 | gfn_t gfn = gpa >> PAGE_SHIFT; |
| 1604 | int seg; |
| 1605 | int offset = offset_in_page(gpa); |
| 1606 | int ret; |
| 1607 | |
| 1608 | while ((seg = next_segment(len, offset)) != 0) { |
| 1609 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); |
| 1610 | if (ret < 0) |
| 1611 | return ret; |
| 1612 | offset = 0; |
| 1613 | len -= seg; |
| 1614 | data += seg; |
| 1615 | ++gfn; |
| 1616 | } |
| 1617 | return 0; |
| 1618 | } |
| 1619 | |
| 1620 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) |
| 1621 | { |
| 1622 | return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len); |
| 1623 | } |
| 1624 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); |
| 1625 | |
| 1626 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) |
| 1627 | { |
| 1628 | gfn_t gfn = gpa >> PAGE_SHIFT; |
| 1629 | int seg; |
| 1630 | int offset = offset_in_page(gpa); |
| 1631 | int ret; |
| 1632 | |
| 1633 | while ((seg = next_segment(len, offset)) != 0) { |
| 1634 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); |
| 1635 | if (ret < 0) |
| 1636 | return ret; |
| 1637 | offset = 0; |
| 1638 | len -= seg; |
| 1639 | ++gfn; |
| 1640 | } |
| 1641 | return 0; |
| 1642 | } |
| 1643 | EXPORT_SYMBOL_GPL(kvm_clear_guest); |
| 1644 | |
| 1645 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
| 1646 | { |
| 1647 | struct kvm_memory_slot *memslot; |
| 1648 | |
| 1649 | gfn = unalias_gfn(kvm, gfn); |
| 1650 | memslot = gfn_to_memslot_unaliased(kvm, gfn); |
| 1651 | if (memslot && memslot->dirty_bitmap) { |
| 1652 | unsigned long rel_gfn = gfn - memslot->base_gfn; |
| 1653 | |
| 1654 | /* avoid RMW */ |
| 1655 | if (!test_bit(rel_gfn, memslot->dirty_bitmap)) |
| 1656 | set_bit(rel_gfn, memslot->dirty_bitmap); |
| 1657 | } |
| 1658 | } |
| 1659 | |
| 1660 | /* |
| 1661 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. |
| 1662 | */ |
| 1663 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
| 1664 | { |
| 1665 | DEFINE_WAIT(wait); |
| 1666 | |
| 1667 | for (;;) { |
| 1668 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); |
| 1669 | |
| 1670 | if (kvm_arch_vcpu_runnable(vcpu)) { |
| 1671 | set_bit(KVM_REQ_UNHALT, &vcpu->requests); |
| 1672 | break; |
| 1673 | } |
| 1674 | if (kvm_cpu_has_pending_timer(vcpu)) |
| 1675 | break; |
| 1676 | if (signal_pending(current)) |
| 1677 | break; |
| 1678 | |
| 1679 | vcpu_put(vcpu); |
| 1680 | schedule(); |
| 1681 | vcpu_load(vcpu); |
| 1682 | } |
| 1683 | |
| 1684 | finish_wait(&vcpu->wq, &wait); |
| 1685 | } |
| 1686 | |
| 1687 | void kvm_resched(struct kvm_vcpu *vcpu) |
| 1688 | { |
| 1689 | if (!need_resched()) |
| 1690 | return; |
| 1691 | cond_resched(); |
| 1692 | } |
| 1693 | EXPORT_SYMBOL_GPL(kvm_resched); |
| 1694 | |
| 1695 | static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
| 1696 | { |
| 1697 | struct kvm_vcpu *vcpu = vma->vm_file->private_data; |
| 1698 | struct page *page; |
| 1699 | |
| 1700 | if (vmf->pgoff == 0) |
| 1701 | page = virt_to_page(vcpu->run); |
| 1702 | #ifdef CONFIG_X86 |
| 1703 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
| 1704 | page = virt_to_page(vcpu->arch.pio_data); |
| 1705 | #endif |
| 1706 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
| 1707 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) |
| 1708 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); |
| 1709 | #endif |
| 1710 | else |
| 1711 | return VM_FAULT_SIGBUS; |
| 1712 | get_page(page); |
| 1713 | vmf->page = page; |
| 1714 | return 0; |
| 1715 | } |
| 1716 | |
| 1717 | static struct vm_operations_struct kvm_vcpu_vm_ops = { |
| 1718 | .fault = kvm_vcpu_fault, |
| 1719 | }; |
| 1720 | |
| 1721 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) |
| 1722 | { |
| 1723 | vma->vm_ops = &kvm_vcpu_vm_ops; |
| 1724 | return 0; |
| 1725 | } |
| 1726 | |
| 1727 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
| 1728 | { |
| 1729 | struct kvm_vcpu *vcpu = filp->private_data; |
| 1730 | |
| 1731 | kvm_put_kvm(vcpu->kvm); |
| 1732 | return 0; |
| 1733 | } |
| 1734 | |
| 1735 | static struct file_operations kvm_vcpu_fops = { |
| 1736 | .release = kvm_vcpu_release, |
| 1737 | .unlocked_ioctl = kvm_vcpu_ioctl, |
| 1738 | .compat_ioctl = kvm_vcpu_ioctl, |
| 1739 | .mmap = kvm_vcpu_mmap, |
| 1740 | }; |
| 1741 | |
| 1742 | /* |
| 1743 | * Allocates an inode for the vcpu. |
| 1744 | */ |
| 1745 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) |
| 1746 | { |
| 1747 | return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, 0); |
| 1748 | } |
| 1749 | |
| 1750 | /* |
| 1751 | * Creates some virtual cpus. Good luck creating more than one. |
| 1752 | */ |
| 1753 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
| 1754 | { |
| 1755 | int r; |
| 1756 | struct kvm_vcpu *vcpu, *v; |
| 1757 | |
| 1758 | vcpu = kvm_arch_vcpu_create(kvm, id); |
| 1759 | if (IS_ERR(vcpu)) |
| 1760 | return PTR_ERR(vcpu); |
| 1761 | |
| 1762 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
| 1763 | |
| 1764 | r = kvm_arch_vcpu_setup(vcpu); |
| 1765 | if (r) |
| 1766 | return r; |
| 1767 | |
| 1768 | mutex_lock(&kvm->lock); |
| 1769 | if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) { |
| 1770 | r = -EINVAL; |
| 1771 | goto vcpu_destroy; |
| 1772 | } |
| 1773 | |
| 1774 | kvm_for_each_vcpu(r, v, kvm) |
| 1775 | if (v->vcpu_id == id) { |
| 1776 | r = -EEXIST; |
| 1777 | goto vcpu_destroy; |
| 1778 | } |
| 1779 | |
| 1780 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); |
| 1781 | |
| 1782 | /* Now it's all set up, let userspace reach it */ |
| 1783 | kvm_get_kvm(kvm); |
| 1784 | r = create_vcpu_fd(vcpu); |
| 1785 | if (r < 0) { |
| 1786 | kvm_put_kvm(kvm); |
| 1787 | goto vcpu_destroy; |
| 1788 | } |
| 1789 | |
| 1790 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; |
| 1791 | smp_wmb(); |
| 1792 | atomic_inc(&kvm->online_vcpus); |
| 1793 | |
| 1794 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
| 1795 | if (kvm->bsp_vcpu_id == id) |
| 1796 | kvm->bsp_vcpu = vcpu; |
| 1797 | #endif |
| 1798 | mutex_unlock(&kvm->lock); |
| 1799 | return r; |
| 1800 | |
| 1801 | vcpu_destroy: |
| 1802 | mutex_unlock(&kvm->lock); |
| 1803 | kvm_arch_vcpu_destroy(vcpu); |
| 1804 | return r; |
| 1805 | } |
| 1806 | |
| 1807 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
| 1808 | { |
| 1809 | if (sigset) { |
| 1810 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); |
| 1811 | vcpu->sigset_active = 1; |
| 1812 | vcpu->sigset = *sigset; |
| 1813 | } else |
| 1814 | vcpu->sigset_active = 0; |
| 1815 | return 0; |
| 1816 | } |
| 1817 | |
| 1818 | #ifdef __KVM_HAVE_MSIX |
| 1819 | static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm, |
| 1820 | struct kvm_assigned_msix_nr *entry_nr) |
| 1821 | { |
| 1822 | int r = 0; |
| 1823 | struct kvm_assigned_dev_kernel *adev; |
| 1824 | |
| 1825 | mutex_lock(&kvm->lock); |
| 1826 | |
| 1827 | adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, |
| 1828 | entry_nr->assigned_dev_id); |
| 1829 | if (!adev) { |
| 1830 | r = -EINVAL; |
| 1831 | goto msix_nr_out; |
| 1832 | } |
| 1833 | |
| 1834 | if (adev->entries_nr == 0) { |
| 1835 | adev->entries_nr = entry_nr->entry_nr; |
| 1836 | if (adev->entries_nr == 0 || |
| 1837 | adev->entries_nr >= KVM_MAX_MSIX_PER_DEV) { |
| 1838 | r = -EINVAL; |
| 1839 | goto msix_nr_out; |
| 1840 | } |
| 1841 | |
| 1842 | adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) * |
| 1843 | entry_nr->entry_nr, |
| 1844 | GFP_KERNEL); |
| 1845 | if (!adev->host_msix_entries) { |
| 1846 | r = -ENOMEM; |
| 1847 | goto msix_nr_out; |
| 1848 | } |
| 1849 | adev->guest_msix_entries = kzalloc( |
| 1850 | sizeof(struct kvm_guest_msix_entry) * |
| 1851 | entry_nr->entry_nr, GFP_KERNEL); |
| 1852 | if (!adev->guest_msix_entries) { |
| 1853 | kfree(adev->host_msix_entries); |
| 1854 | r = -ENOMEM; |
| 1855 | goto msix_nr_out; |
| 1856 | } |
| 1857 | } else /* Not allowed set MSI-X number twice */ |
| 1858 | r = -EINVAL; |
| 1859 | msix_nr_out: |
| 1860 | mutex_unlock(&kvm->lock); |
| 1861 | return r; |
| 1862 | } |
| 1863 | |
| 1864 | static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm, |
| 1865 | struct kvm_assigned_msix_entry *entry) |
| 1866 | { |
| 1867 | int r = 0, i; |
| 1868 | struct kvm_assigned_dev_kernel *adev; |
| 1869 | |
| 1870 | mutex_lock(&kvm->lock); |
| 1871 | |
| 1872 | adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, |
| 1873 | entry->assigned_dev_id); |
| 1874 | |
| 1875 | if (!adev) { |
| 1876 | r = -EINVAL; |
| 1877 | goto msix_entry_out; |
| 1878 | } |
| 1879 | |
| 1880 | for (i = 0; i < adev->entries_nr; i++) |
| 1881 | if (adev->guest_msix_entries[i].vector == 0 || |
| 1882 | adev->guest_msix_entries[i].entry == entry->entry) { |
| 1883 | adev->guest_msix_entries[i].entry = entry->entry; |
| 1884 | adev->guest_msix_entries[i].vector = entry->gsi; |
| 1885 | adev->host_msix_entries[i].entry = entry->entry; |
| 1886 | break; |
| 1887 | } |
| 1888 | if (i == adev->entries_nr) { |
| 1889 | r = -ENOSPC; |
| 1890 | goto msix_entry_out; |
| 1891 | } |
| 1892 | |
| 1893 | msix_entry_out: |
| 1894 | mutex_unlock(&kvm->lock); |
| 1895 | |
| 1896 | return r; |
| 1897 | } |
| 1898 | #endif |
| 1899 | |
| 1900 | static long kvm_vcpu_ioctl(struct file *filp, |
| 1901 | unsigned int ioctl, unsigned long arg) |
| 1902 | { |
| 1903 | struct kvm_vcpu *vcpu = filp->private_data; |
| 1904 | void __user *argp = (void __user *)arg; |
| 1905 | int r; |
| 1906 | struct kvm_fpu *fpu = NULL; |
| 1907 | struct kvm_sregs *kvm_sregs = NULL; |
| 1908 | |
| 1909 | if (vcpu->kvm->mm != current->mm) |
| 1910 | return -EIO; |
| 1911 | switch (ioctl) { |
| 1912 | case KVM_RUN: |
| 1913 | r = -EINVAL; |
| 1914 | if (arg) |
| 1915 | goto out; |
| 1916 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
| 1917 | break; |
| 1918 | case KVM_GET_REGS: { |
| 1919 | struct kvm_regs *kvm_regs; |
| 1920 | |
| 1921 | r = -ENOMEM; |
| 1922 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); |
| 1923 | if (!kvm_regs) |
| 1924 | goto out; |
| 1925 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
| 1926 | if (r) |
| 1927 | goto out_free1; |
| 1928 | r = -EFAULT; |
| 1929 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
| 1930 | goto out_free1; |
| 1931 | r = 0; |
| 1932 | out_free1: |
| 1933 | kfree(kvm_regs); |
| 1934 | break; |
| 1935 | } |
| 1936 | case KVM_SET_REGS: { |
| 1937 | struct kvm_regs *kvm_regs; |
| 1938 | |
| 1939 | r = -ENOMEM; |
| 1940 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); |
| 1941 | if (!kvm_regs) |
| 1942 | goto out; |
| 1943 | r = -EFAULT; |
| 1944 | if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs))) |
| 1945 | goto out_free2; |
| 1946 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); |
| 1947 | if (r) |
| 1948 | goto out_free2; |
| 1949 | r = 0; |
| 1950 | out_free2: |
| 1951 | kfree(kvm_regs); |
| 1952 | break; |
| 1953 | } |
| 1954 | case KVM_GET_SREGS: { |
| 1955 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
| 1956 | r = -ENOMEM; |
| 1957 | if (!kvm_sregs) |
| 1958 | goto out; |
| 1959 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); |
| 1960 | if (r) |
| 1961 | goto out; |
| 1962 | r = -EFAULT; |
| 1963 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
| 1964 | goto out; |
| 1965 | r = 0; |
| 1966 | break; |
| 1967 | } |
| 1968 | case KVM_SET_SREGS: { |
| 1969 | kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
| 1970 | r = -ENOMEM; |
| 1971 | if (!kvm_sregs) |
| 1972 | goto out; |
| 1973 | r = -EFAULT; |
| 1974 | if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs))) |
| 1975 | goto out; |
| 1976 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
| 1977 | if (r) |
| 1978 | goto out; |
| 1979 | r = 0; |
| 1980 | break; |
| 1981 | } |
| 1982 | case KVM_GET_MP_STATE: { |
| 1983 | struct kvm_mp_state mp_state; |
| 1984 | |
| 1985 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); |
| 1986 | if (r) |
| 1987 | goto out; |
| 1988 | r = -EFAULT; |
| 1989 | if (copy_to_user(argp, &mp_state, sizeof mp_state)) |
| 1990 | goto out; |
| 1991 | r = 0; |
| 1992 | break; |
| 1993 | } |
| 1994 | case KVM_SET_MP_STATE: { |
| 1995 | struct kvm_mp_state mp_state; |
| 1996 | |
| 1997 | r = -EFAULT; |
| 1998 | if (copy_from_user(&mp_state, argp, sizeof mp_state)) |
| 1999 | goto out; |
| 2000 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); |
| 2001 | if (r) |
| 2002 | goto out; |
| 2003 | r = 0; |
| 2004 | break; |
| 2005 | } |
| 2006 | case KVM_TRANSLATE: { |
| 2007 | struct kvm_translation tr; |
| 2008 | |
| 2009 | r = -EFAULT; |
| 2010 | if (copy_from_user(&tr, argp, sizeof tr)) |
| 2011 | goto out; |
| 2012 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
| 2013 | if (r) |
| 2014 | goto out; |
| 2015 | r = -EFAULT; |
| 2016 | if (copy_to_user(argp, &tr, sizeof tr)) |
| 2017 | goto out; |
| 2018 | r = 0; |
| 2019 | break; |
| 2020 | } |
| 2021 | case KVM_SET_GUEST_DEBUG: { |
| 2022 | struct kvm_guest_debug dbg; |
| 2023 | |
| 2024 | r = -EFAULT; |
| 2025 | if (copy_from_user(&dbg, argp, sizeof dbg)) |
| 2026 | goto out; |
| 2027 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
| 2028 | if (r) |
| 2029 | goto out; |
| 2030 | r = 0; |
| 2031 | break; |
| 2032 | } |
| 2033 | case KVM_SET_SIGNAL_MASK: { |
| 2034 | struct kvm_signal_mask __user *sigmask_arg = argp; |
| 2035 | struct kvm_signal_mask kvm_sigmask; |
| 2036 | sigset_t sigset, *p; |
| 2037 | |
| 2038 | p = NULL; |
| 2039 | if (argp) { |
| 2040 | r = -EFAULT; |
| 2041 | if (copy_from_user(&kvm_sigmask, argp, |
| 2042 | sizeof kvm_sigmask)) |
| 2043 | goto out; |
| 2044 | r = -EINVAL; |
| 2045 | if (kvm_sigmask.len != sizeof sigset) |
| 2046 | goto out; |
| 2047 | r = -EFAULT; |
| 2048 | if (copy_from_user(&sigset, sigmask_arg->sigset, |
| 2049 | sizeof sigset)) |
| 2050 | goto out; |
| 2051 | p = &sigset; |
| 2052 | } |
| 2053 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); |
| 2054 | break; |
| 2055 | } |
| 2056 | case KVM_GET_FPU: { |
| 2057 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
| 2058 | r = -ENOMEM; |
| 2059 | if (!fpu) |
| 2060 | goto out; |
| 2061 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); |
| 2062 | if (r) |
| 2063 | goto out; |
| 2064 | r = -EFAULT; |
| 2065 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
| 2066 | goto out; |
| 2067 | r = 0; |
| 2068 | break; |
| 2069 | } |
| 2070 | case KVM_SET_FPU: { |
| 2071 | fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
| 2072 | r = -ENOMEM; |
| 2073 | if (!fpu) |
| 2074 | goto out; |
| 2075 | r = -EFAULT; |
| 2076 | if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu))) |
| 2077 | goto out; |
| 2078 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
| 2079 | if (r) |
| 2080 | goto out; |
| 2081 | r = 0; |
| 2082 | break; |
| 2083 | } |
| 2084 | default: |
| 2085 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
| 2086 | } |
| 2087 | out: |
| 2088 | kfree(fpu); |
| 2089 | kfree(kvm_sregs); |
| 2090 | return r; |
| 2091 | } |
| 2092 | |
| 2093 | static long kvm_vm_ioctl(struct file *filp, |
| 2094 | unsigned int ioctl, unsigned long arg) |
| 2095 | { |
| 2096 | struct kvm *kvm = filp->private_data; |
| 2097 | void __user *argp = (void __user *)arg; |
| 2098 | int r; |
| 2099 | |
| 2100 | if (kvm->mm != current->mm) |
| 2101 | return -EIO; |
| 2102 | switch (ioctl) { |
| 2103 | case KVM_CREATE_VCPU: |
| 2104 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); |
| 2105 | if (r < 0) |
| 2106 | goto out; |
| 2107 | break; |
| 2108 | case KVM_SET_USER_MEMORY_REGION: { |
| 2109 | struct kvm_userspace_memory_region kvm_userspace_mem; |
| 2110 | |
| 2111 | r = -EFAULT; |
| 2112 | if (copy_from_user(&kvm_userspace_mem, argp, |
| 2113 | sizeof kvm_userspace_mem)) |
| 2114 | goto out; |
| 2115 | |
| 2116 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1); |
| 2117 | if (r) |
| 2118 | goto out; |
| 2119 | break; |
| 2120 | } |
| 2121 | case KVM_GET_DIRTY_LOG: { |
| 2122 | struct kvm_dirty_log log; |
| 2123 | |
| 2124 | r = -EFAULT; |
| 2125 | if (copy_from_user(&log, argp, sizeof log)) |
| 2126 | goto out; |
| 2127 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
| 2128 | if (r) |
| 2129 | goto out; |
| 2130 | break; |
| 2131 | } |
| 2132 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
| 2133 | case KVM_REGISTER_COALESCED_MMIO: { |
| 2134 | struct kvm_coalesced_mmio_zone zone; |
| 2135 | r = -EFAULT; |
| 2136 | if (copy_from_user(&zone, argp, sizeof zone)) |
| 2137 | goto out; |
| 2138 | r = -ENXIO; |
| 2139 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); |
| 2140 | if (r) |
| 2141 | goto out; |
| 2142 | r = 0; |
| 2143 | break; |
| 2144 | } |
| 2145 | case KVM_UNREGISTER_COALESCED_MMIO: { |
| 2146 | struct kvm_coalesced_mmio_zone zone; |
| 2147 | r = -EFAULT; |
| 2148 | if (copy_from_user(&zone, argp, sizeof zone)) |
| 2149 | goto out; |
| 2150 | r = -ENXIO; |
| 2151 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); |
| 2152 | if (r) |
| 2153 | goto out; |
| 2154 | r = 0; |
| 2155 | break; |
| 2156 | } |
| 2157 | #endif |
| 2158 | #ifdef KVM_CAP_DEVICE_ASSIGNMENT |
| 2159 | case KVM_ASSIGN_PCI_DEVICE: { |
| 2160 | struct kvm_assigned_pci_dev assigned_dev; |
| 2161 | |
| 2162 | r = -EFAULT; |
| 2163 | if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev)) |
| 2164 | goto out; |
| 2165 | r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev); |
| 2166 | if (r) |
| 2167 | goto out; |
| 2168 | break; |
| 2169 | } |
| 2170 | case KVM_ASSIGN_IRQ: { |
| 2171 | r = -EOPNOTSUPP; |
| 2172 | break; |
| 2173 | } |
| 2174 | #ifdef KVM_CAP_ASSIGN_DEV_IRQ |
| 2175 | case KVM_ASSIGN_DEV_IRQ: { |
| 2176 | struct kvm_assigned_irq assigned_irq; |
| 2177 | |
| 2178 | r = -EFAULT; |
| 2179 | if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq)) |
| 2180 | goto out; |
| 2181 | r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq); |
| 2182 | if (r) |
| 2183 | goto out; |
| 2184 | break; |
| 2185 | } |
| 2186 | case KVM_DEASSIGN_DEV_IRQ: { |
| 2187 | struct kvm_assigned_irq assigned_irq; |
| 2188 | |
| 2189 | r = -EFAULT; |
| 2190 | if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq)) |
| 2191 | goto out; |
| 2192 | r = kvm_vm_ioctl_deassign_dev_irq(kvm, &assigned_irq); |
| 2193 | if (r) |
| 2194 | goto out; |
| 2195 | break; |
| 2196 | } |
| 2197 | #endif |
| 2198 | #endif |
| 2199 | #ifdef KVM_CAP_DEVICE_DEASSIGNMENT |
| 2200 | case KVM_DEASSIGN_PCI_DEVICE: { |
| 2201 | struct kvm_assigned_pci_dev assigned_dev; |
| 2202 | |
| 2203 | r = -EFAULT; |
| 2204 | if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev)) |
| 2205 | goto out; |
| 2206 | r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev); |
| 2207 | if (r) |
| 2208 | goto out; |
| 2209 | break; |
| 2210 | } |
| 2211 | #endif |
| 2212 | #ifdef KVM_CAP_IRQ_ROUTING |
| 2213 | case KVM_SET_GSI_ROUTING: { |
| 2214 | struct kvm_irq_routing routing; |
| 2215 | struct kvm_irq_routing __user *urouting; |
| 2216 | struct kvm_irq_routing_entry *entries; |
| 2217 | |
| 2218 | r = -EFAULT; |
| 2219 | if (copy_from_user(&routing, argp, sizeof(routing))) |
| 2220 | goto out; |
| 2221 | r = -EINVAL; |
| 2222 | if (routing.nr >= KVM_MAX_IRQ_ROUTES) |
| 2223 | goto out; |
| 2224 | if (routing.flags) |
| 2225 | goto out; |
| 2226 | r = -ENOMEM; |
| 2227 | entries = vmalloc(routing.nr * sizeof(*entries)); |
| 2228 | if (!entries) |
| 2229 | goto out; |
| 2230 | r = -EFAULT; |
| 2231 | urouting = argp; |
| 2232 | if (copy_from_user(entries, urouting->entries, |
| 2233 | routing.nr * sizeof(*entries))) |
| 2234 | goto out_free_irq_routing; |
| 2235 | r = kvm_set_irq_routing(kvm, entries, routing.nr, |
| 2236 | routing.flags); |
| 2237 | out_free_irq_routing: |
| 2238 | vfree(entries); |
| 2239 | break; |
| 2240 | } |
| 2241 | #endif /* KVM_CAP_IRQ_ROUTING */ |
| 2242 | #ifdef __KVM_HAVE_MSIX |
| 2243 | case KVM_ASSIGN_SET_MSIX_NR: { |
| 2244 | struct kvm_assigned_msix_nr entry_nr; |
| 2245 | r = -EFAULT; |
| 2246 | if (copy_from_user(&entry_nr, argp, sizeof entry_nr)) |
| 2247 | goto out; |
| 2248 | r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr); |
| 2249 | if (r) |
| 2250 | goto out; |
| 2251 | break; |
| 2252 | } |
| 2253 | case KVM_ASSIGN_SET_MSIX_ENTRY: { |
| 2254 | struct kvm_assigned_msix_entry entry; |
| 2255 | r = -EFAULT; |
| 2256 | if (copy_from_user(&entry, argp, sizeof entry)) |
| 2257 | goto out; |
| 2258 | r = kvm_vm_ioctl_set_msix_entry(kvm, &entry); |
| 2259 | if (r) |
| 2260 | goto out; |
| 2261 | break; |
| 2262 | } |
| 2263 | #endif |
| 2264 | case KVM_IRQFD: { |
| 2265 | struct kvm_irqfd data; |
| 2266 | |
| 2267 | r = -EFAULT; |
| 2268 | if (copy_from_user(&data, argp, sizeof data)) |
| 2269 | goto out; |
| 2270 | r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags); |
| 2271 | break; |
| 2272 | } |
| 2273 | case KVM_IOEVENTFD: { |
| 2274 | struct kvm_ioeventfd data; |
| 2275 | |
| 2276 | r = -EFAULT; |
| 2277 | if (copy_from_user(&data, argp, sizeof data)) |
| 2278 | goto out; |
| 2279 | r = kvm_ioeventfd(kvm, &data); |
| 2280 | break; |
| 2281 | } |
| 2282 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
| 2283 | case KVM_SET_BOOT_CPU_ID: |
| 2284 | r = 0; |
| 2285 | mutex_lock(&kvm->lock); |
| 2286 | if (atomic_read(&kvm->online_vcpus) != 0) |
| 2287 | r = -EBUSY; |
| 2288 | else |
| 2289 | kvm->bsp_vcpu_id = arg; |
| 2290 | mutex_unlock(&kvm->lock); |
| 2291 | break; |
| 2292 | #endif |
| 2293 | default: |
| 2294 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
| 2295 | } |
| 2296 | out: |
| 2297 | return r; |
| 2298 | } |
| 2299 | |
| 2300 | static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
| 2301 | { |
| 2302 | struct page *page[1]; |
| 2303 | unsigned long addr; |
| 2304 | int npages; |
| 2305 | gfn_t gfn = vmf->pgoff; |
| 2306 | struct kvm *kvm = vma->vm_file->private_data; |
| 2307 | |
| 2308 | addr = gfn_to_hva(kvm, gfn); |
| 2309 | if (kvm_is_error_hva(addr)) |
| 2310 | return VM_FAULT_SIGBUS; |
| 2311 | |
| 2312 | npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page, |
| 2313 | NULL); |
| 2314 | if (unlikely(npages != 1)) |
| 2315 | return VM_FAULT_SIGBUS; |
| 2316 | |
| 2317 | vmf->page = page[0]; |
| 2318 | return 0; |
| 2319 | } |
| 2320 | |
| 2321 | static struct vm_operations_struct kvm_vm_vm_ops = { |
| 2322 | .fault = kvm_vm_fault, |
| 2323 | }; |
| 2324 | |
| 2325 | static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma) |
| 2326 | { |
| 2327 | vma->vm_ops = &kvm_vm_vm_ops; |
| 2328 | return 0; |
| 2329 | } |
| 2330 | |
| 2331 | static struct file_operations kvm_vm_fops = { |
| 2332 | .release = kvm_vm_release, |
| 2333 | .unlocked_ioctl = kvm_vm_ioctl, |
| 2334 | .compat_ioctl = kvm_vm_ioctl, |
| 2335 | .mmap = kvm_vm_mmap, |
| 2336 | }; |
| 2337 | |
| 2338 | static int kvm_dev_ioctl_create_vm(void) |
| 2339 | { |
| 2340 | int fd; |
| 2341 | struct kvm *kvm; |
| 2342 | |
| 2343 | kvm = kvm_create_vm(); |
| 2344 | if (IS_ERR(kvm)) |
| 2345 | return PTR_ERR(kvm); |
| 2346 | fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, 0); |
| 2347 | if (fd < 0) |
| 2348 | kvm_put_kvm(kvm); |
| 2349 | |
| 2350 | return fd; |
| 2351 | } |
| 2352 | |
| 2353 | static long kvm_dev_ioctl_check_extension_generic(long arg) |
| 2354 | { |
| 2355 | switch (arg) { |
| 2356 | case KVM_CAP_USER_MEMORY: |
| 2357 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: |
| 2358 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: |
| 2359 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
| 2360 | case KVM_CAP_SET_BOOT_CPU_ID: |
| 2361 | #endif |
| 2362 | return 1; |
| 2363 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
| 2364 | case KVM_CAP_IRQ_ROUTING: |
| 2365 | return KVM_MAX_IRQ_ROUTES; |
| 2366 | #endif |
| 2367 | default: |
| 2368 | break; |
| 2369 | } |
| 2370 | return kvm_dev_ioctl_check_extension(arg); |
| 2371 | } |
| 2372 | |
| 2373 | static long kvm_dev_ioctl(struct file *filp, |
| 2374 | unsigned int ioctl, unsigned long arg) |
| 2375 | { |
| 2376 | long r = -EINVAL; |
| 2377 | |
| 2378 | switch (ioctl) { |
| 2379 | case KVM_GET_API_VERSION: |
| 2380 | r = -EINVAL; |
| 2381 | if (arg) |
| 2382 | goto out; |
| 2383 | r = KVM_API_VERSION; |
| 2384 | break; |
| 2385 | case KVM_CREATE_VM: |
| 2386 | r = -EINVAL; |
| 2387 | if (arg) |
| 2388 | goto out; |
| 2389 | r = kvm_dev_ioctl_create_vm(); |
| 2390 | break; |
| 2391 | case KVM_CHECK_EXTENSION: |
| 2392 | r = kvm_dev_ioctl_check_extension_generic(arg); |
| 2393 | break; |
| 2394 | case KVM_GET_VCPU_MMAP_SIZE: |
| 2395 | r = -EINVAL; |
| 2396 | if (arg) |
| 2397 | goto out; |
| 2398 | r = PAGE_SIZE; /* struct kvm_run */ |
| 2399 | #ifdef CONFIG_X86 |
| 2400 | r += PAGE_SIZE; /* pio data page */ |
| 2401 | #endif |
| 2402 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
| 2403 | r += PAGE_SIZE; /* coalesced mmio ring page */ |
| 2404 | #endif |
| 2405 | break; |
| 2406 | case KVM_TRACE_ENABLE: |
| 2407 | case KVM_TRACE_PAUSE: |
| 2408 | case KVM_TRACE_DISABLE: |
| 2409 | r = -EOPNOTSUPP; |
| 2410 | break; |
| 2411 | default: |
| 2412 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
| 2413 | } |
| 2414 | out: |
| 2415 | return r; |
| 2416 | } |
| 2417 | |
| 2418 | static struct file_operations kvm_chardev_ops = { |
| 2419 | .unlocked_ioctl = kvm_dev_ioctl, |
| 2420 | .compat_ioctl = kvm_dev_ioctl, |
| 2421 | }; |
| 2422 | |
| 2423 | static struct miscdevice kvm_dev = { |
| 2424 | KVM_MINOR, |
| 2425 | "kvm", |
| 2426 | &kvm_chardev_ops, |
| 2427 | }; |
| 2428 | |
| 2429 | static void hardware_enable(void *junk) |
| 2430 | { |
| 2431 | int cpu = raw_smp_processor_id(); |
| 2432 | |
| 2433 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
| 2434 | return; |
| 2435 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
| 2436 | kvm_arch_hardware_enable(NULL); |
| 2437 | } |
| 2438 | |
| 2439 | static void hardware_disable(void *junk) |
| 2440 | { |
| 2441 | int cpu = raw_smp_processor_id(); |
| 2442 | |
| 2443 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
| 2444 | return; |
| 2445 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
| 2446 | kvm_arch_hardware_disable(NULL); |
| 2447 | } |
| 2448 | |
| 2449 | static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, |
| 2450 | void *v) |
| 2451 | { |
| 2452 | int cpu = (long)v; |
| 2453 | |
| 2454 | val &= ~CPU_TASKS_FROZEN; |
| 2455 | switch (val) { |
| 2456 | case CPU_DYING: |
| 2457 | printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", |
| 2458 | cpu); |
| 2459 | hardware_disable(NULL); |
| 2460 | break; |
| 2461 | case CPU_UP_CANCELED: |
| 2462 | printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", |
| 2463 | cpu); |
| 2464 | smp_call_function_single(cpu, hardware_disable, NULL, 1); |
| 2465 | break; |
| 2466 | case CPU_ONLINE: |
| 2467 | printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n", |
| 2468 | cpu); |
| 2469 | smp_call_function_single(cpu, hardware_enable, NULL, 1); |
| 2470 | break; |
| 2471 | } |
| 2472 | return NOTIFY_OK; |
| 2473 | } |
| 2474 | |
| 2475 | |
| 2476 | asmlinkage void kvm_handle_fault_on_reboot(void) |
| 2477 | { |
| 2478 | if (kvm_rebooting) |
| 2479 | /* spin while reset goes on */ |
| 2480 | while (true) |
| 2481 | ; |
| 2482 | /* Fault while not rebooting. We want the trace. */ |
| 2483 | BUG(); |
| 2484 | } |
| 2485 | EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot); |
| 2486 | |
| 2487 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
| 2488 | void *v) |
| 2489 | { |
| 2490 | /* |
| 2491 | * Some (well, at least mine) BIOSes hang on reboot if |
| 2492 | * in vmx root mode. |
| 2493 | * |
| 2494 | * And Intel TXT required VMX off for all cpu when system shutdown. |
| 2495 | */ |
| 2496 | printk(KERN_INFO "kvm: exiting hardware virtualization\n"); |
| 2497 | kvm_rebooting = true; |
| 2498 | on_each_cpu(hardware_disable, NULL, 1); |
| 2499 | return NOTIFY_OK; |
| 2500 | } |
| 2501 | |
| 2502 | static struct notifier_block kvm_reboot_notifier = { |
| 2503 | .notifier_call = kvm_reboot, |
| 2504 | .priority = 0, |
| 2505 | }; |
| 2506 | |
| 2507 | void kvm_io_bus_init(struct kvm_io_bus *bus) |
| 2508 | { |
| 2509 | memset(bus, 0, sizeof(*bus)); |
| 2510 | } |
| 2511 | |
| 2512 | void kvm_io_bus_destroy(struct kvm_io_bus *bus) |
| 2513 | { |
| 2514 | int i; |
| 2515 | |
| 2516 | for (i = 0; i < bus->dev_count; i++) { |
| 2517 | struct kvm_io_device *pos = bus->devs[i]; |
| 2518 | |
| 2519 | kvm_iodevice_destructor(pos); |
| 2520 | } |
| 2521 | } |
| 2522 | |
| 2523 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
| 2524 | int kvm_io_bus_write(struct kvm_io_bus *bus, gpa_t addr, |
| 2525 | int len, const void *val) |
| 2526 | { |
| 2527 | int i; |
| 2528 | for (i = 0; i < bus->dev_count; i++) |
| 2529 | if (!kvm_iodevice_write(bus->devs[i], addr, len, val)) |
| 2530 | return 0; |
| 2531 | return -EOPNOTSUPP; |
| 2532 | } |
| 2533 | |
| 2534 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
| 2535 | int kvm_io_bus_read(struct kvm_io_bus *bus, gpa_t addr, int len, void *val) |
| 2536 | { |
| 2537 | int i; |
| 2538 | for (i = 0; i < bus->dev_count; i++) |
| 2539 | if (!kvm_iodevice_read(bus->devs[i], addr, len, val)) |
| 2540 | return 0; |
| 2541 | return -EOPNOTSUPP; |
| 2542 | } |
| 2543 | |
| 2544 | int kvm_io_bus_register_dev(struct kvm *kvm, struct kvm_io_bus *bus, |
| 2545 | struct kvm_io_device *dev) |
| 2546 | { |
| 2547 | int ret; |
| 2548 | |
| 2549 | down_write(&kvm->slots_lock); |
| 2550 | ret = __kvm_io_bus_register_dev(bus, dev); |
| 2551 | up_write(&kvm->slots_lock); |
| 2552 | |
| 2553 | return ret; |
| 2554 | } |
| 2555 | |
| 2556 | /* An unlocked version. Caller must have write lock on slots_lock. */ |
| 2557 | int __kvm_io_bus_register_dev(struct kvm_io_bus *bus, |
| 2558 | struct kvm_io_device *dev) |
| 2559 | { |
| 2560 | if (bus->dev_count > NR_IOBUS_DEVS-1) |
| 2561 | return -ENOSPC; |
| 2562 | |
| 2563 | bus->devs[bus->dev_count++] = dev; |
| 2564 | |
| 2565 | return 0; |
| 2566 | } |
| 2567 | |
| 2568 | void kvm_io_bus_unregister_dev(struct kvm *kvm, |
| 2569 | struct kvm_io_bus *bus, |
| 2570 | struct kvm_io_device *dev) |
| 2571 | { |
| 2572 | down_write(&kvm->slots_lock); |
| 2573 | __kvm_io_bus_unregister_dev(bus, dev); |
| 2574 | up_write(&kvm->slots_lock); |
| 2575 | } |
| 2576 | |
| 2577 | /* An unlocked version. Caller must have write lock on slots_lock. */ |
| 2578 | void __kvm_io_bus_unregister_dev(struct kvm_io_bus *bus, |
| 2579 | struct kvm_io_device *dev) |
| 2580 | { |
| 2581 | int i; |
| 2582 | |
| 2583 | for (i = 0; i < bus->dev_count; i++) |
| 2584 | if (bus->devs[i] == dev) { |
| 2585 | bus->devs[i] = bus->devs[--bus->dev_count]; |
| 2586 | break; |
| 2587 | } |
| 2588 | } |
| 2589 | |
| 2590 | static struct notifier_block kvm_cpu_notifier = { |
| 2591 | .notifier_call = kvm_cpu_hotplug, |
| 2592 | .priority = 20, /* must be > scheduler priority */ |
| 2593 | }; |
| 2594 | |
| 2595 | static int vm_stat_get(void *_offset, u64 *val) |
| 2596 | { |
| 2597 | unsigned offset = (long)_offset; |
| 2598 | struct kvm *kvm; |
| 2599 | |
| 2600 | *val = 0; |
| 2601 | spin_lock(&kvm_lock); |
| 2602 | list_for_each_entry(kvm, &vm_list, vm_list) |
| 2603 | *val += *(u32 *)((void *)kvm + offset); |
| 2604 | spin_unlock(&kvm_lock); |
| 2605 | return 0; |
| 2606 | } |
| 2607 | |
| 2608 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); |
| 2609 | |
| 2610 | static int vcpu_stat_get(void *_offset, u64 *val) |
| 2611 | { |
| 2612 | unsigned offset = (long)_offset; |
| 2613 | struct kvm *kvm; |
| 2614 | struct kvm_vcpu *vcpu; |
| 2615 | int i; |
| 2616 | |
| 2617 | *val = 0; |
| 2618 | spin_lock(&kvm_lock); |
| 2619 | list_for_each_entry(kvm, &vm_list, vm_list) |
| 2620 | kvm_for_each_vcpu(i, vcpu, kvm) |
| 2621 | *val += *(u32 *)((void *)vcpu + offset); |
| 2622 | |
| 2623 | spin_unlock(&kvm_lock); |
| 2624 | return 0; |
| 2625 | } |
| 2626 | |
| 2627 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); |
| 2628 | |
| 2629 | static struct file_operations *stat_fops[] = { |
| 2630 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
| 2631 | [KVM_STAT_VM] = &vm_stat_fops, |
| 2632 | }; |
| 2633 | |
| 2634 | static void kvm_init_debug(void) |
| 2635 | { |
| 2636 | struct kvm_stats_debugfs_item *p; |
| 2637 | |
| 2638 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
| 2639 | for (p = debugfs_entries; p->name; ++p) |
| 2640 | p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir, |
| 2641 | (void *)(long)p->offset, |
| 2642 | stat_fops[p->kind]); |
| 2643 | } |
| 2644 | |
| 2645 | static void kvm_exit_debug(void) |
| 2646 | { |
| 2647 | struct kvm_stats_debugfs_item *p; |
| 2648 | |
| 2649 | for (p = debugfs_entries; p->name; ++p) |
| 2650 | debugfs_remove(p->dentry); |
| 2651 | debugfs_remove(kvm_debugfs_dir); |
| 2652 | } |
| 2653 | |
| 2654 | static int kvm_suspend(struct sys_device *dev, pm_message_t state) |
| 2655 | { |
| 2656 | hardware_disable(NULL); |
| 2657 | return 0; |
| 2658 | } |
| 2659 | |
| 2660 | static int kvm_resume(struct sys_device *dev) |
| 2661 | { |
| 2662 | hardware_enable(NULL); |
| 2663 | return 0; |
| 2664 | } |
| 2665 | |
| 2666 | static struct sysdev_class kvm_sysdev_class = { |
| 2667 | .name = "kvm", |
| 2668 | .suspend = kvm_suspend, |
| 2669 | .resume = kvm_resume, |
| 2670 | }; |
| 2671 | |
| 2672 | static struct sys_device kvm_sysdev = { |
| 2673 | .id = 0, |
| 2674 | .cls = &kvm_sysdev_class, |
| 2675 | }; |
| 2676 | |
| 2677 | struct page *bad_page; |
| 2678 | pfn_t bad_pfn; |
| 2679 | |
| 2680 | static inline |
| 2681 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) |
| 2682 | { |
| 2683 | return container_of(pn, struct kvm_vcpu, preempt_notifier); |
| 2684 | } |
| 2685 | |
| 2686 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) |
| 2687 | { |
| 2688 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); |
| 2689 | |
| 2690 | kvm_arch_vcpu_load(vcpu, cpu); |
| 2691 | } |
| 2692 | |
| 2693 | static void kvm_sched_out(struct preempt_notifier *pn, |
| 2694 | struct task_struct *next) |
| 2695 | { |
| 2696 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); |
| 2697 | |
| 2698 | kvm_arch_vcpu_put(vcpu); |
| 2699 | } |
| 2700 | |
| 2701 | int kvm_init(void *opaque, unsigned int vcpu_size, |
| 2702 | struct module *module) |
| 2703 | { |
| 2704 | int r; |
| 2705 | int cpu; |
| 2706 | |
| 2707 | kvm_init_debug(); |
| 2708 | |
| 2709 | r = kvm_arch_init(opaque); |
| 2710 | if (r) |
| 2711 | goto out_fail; |
| 2712 | |
| 2713 | bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
| 2714 | |
| 2715 | if (bad_page == NULL) { |
| 2716 | r = -ENOMEM; |
| 2717 | goto out; |
| 2718 | } |
| 2719 | |
| 2720 | bad_pfn = page_to_pfn(bad_page); |
| 2721 | |
| 2722 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
| 2723 | r = -ENOMEM; |
| 2724 | goto out_free_0; |
| 2725 | } |
| 2726 | |
| 2727 | r = kvm_arch_hardware_setup(); |
| 2728 | if (r < 0) |
| 2729 | goto out_free_0a; |
| 2730 | |
| 2731 | for_each_online_cpu(cpu) { |
| 2732 | smp_call_function_single(cpu, |
| 2733 | kvm_arch_check_processor_compat, |
| 2734 | &r, 1); |
| 2735 | if (r < 0) |
| 2736 | goto out_free_1; |
| 2737 | } |
| 2738 | |
| 2739 | on_each_cpu(hardware_enable, NULL, 1); |
| 2740 | r = register_cpu_notifier(&kvm_cpu_notifier); |
| 2741 | if (r) |
| 2742 | goto out_free_2; |
| 2743 | register_reboot_notifier(&kvm_reboot_notifier); |
| 2744 | |
| 2745 | r = sysdev_class_register(&kvm_sysdev_class); |
| 2746 | if (r) |
| 2747 | goto out_free_3; |
| 2748 | |
| 2749 | r = sysdev_register(&kvm_sysdev); |
| 2750 | if (r) |
| 2751 | goto out_free_4; |
| 2752 | |
| 2753 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
| 2754 | kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, |
| 2755 | __alignof__(struct kvm_vcpu), |
| 2756 | 0, NULL); |
| 2757 | if (!kvm_vcpu_cache) { |
| 2758 | r = -ENOMEM; |
| 2759 | goto out_free_5; |
| 2760 | } |
| 2761 | |
| 2762 | kvm_chardev_ops.owner = module; |
| 2763 | kvm_vm_fops.owner = module; |
| 2764 | kvm_vcpu_fops.owner = module; |
| 2765 | |
| 2766 | r = misc_register(&kvm_dev); |
| 2767 | if (r) { |
| 2768 | printk(KERN_ERR "kvm: misc device register failed\n"); |
| 2769 | goto out_free; |
| 2770 | } |
| 2771 | |
| 2772 | kvm_preempt_ops.sched_in = kvm_sched_in; |
| 2773 | kvm_preempt_ops.sched_out = kvm_sched_out; |
| 2774 | |
| 2775 | return 0; |
| 2776 | |
| 2777 | out_free: |
| 2778 | kmem_cache_destroy(kvm_vcpu_cache); |
| 2779 | out_free_5: |
| 2780 | sysdev_unregister(&kvm_sysdev); |
| 2781 | out_free_4: |
| 2782 | sysdev_class_unregister(&kvm_sysdev_class); |
| 2783 | out_free_3: |
| 2784 | unregister_reboot_notifier(&kvm_reboot_notifier); |
| 2785 | unregister_cpu_notifier(&kvm_cpu_notifier); |
| 2786 | out_free_2: |
| 2787 | on_each_cpu(hardware_disable, NULL, 1); |
| 2788 | out_free_1: |
| 2789 | kvm_arch_hardware_unsetup(); |
| 2790 | out_free_0a: |
| 2791 | free_cpumask_var(cpus_hardware_enabled); |
| 2792 | out_free_0: |
| 2793 | __free_page(bad_page); |
| 2794 | out: |
| 2795 | kvm_arch_exit(); |
| 2796 | out_fail: |
| 2797 | kvm_exit_debug(); |
| 2798 | return r; |
| 2799 | } |
| 2800 | EXPORT_SYMBOL_GPL(kvm_init); |
| 2801 | |
| 2802 | void kvm_exit(void) |
| 2803 | { |
| 2804 | tracepoint_synchronize_unregister(); |
| 2805 | misc_deregister(&kvm_dev); |
| 2806 | kmem_cache_destroy(kvm_vcpu_cache); |
| 2807 | sysdev_unregister(&kvm_sysdev); |
| 2808 | sysdev_class_unregister(&kvm_sysdev_class); |
| 2809 | unregister_reboot_notifier(&kvm_reboot_notifier); |
| 2810 | unregister_cpu_notifier(&kvm_cpu_notifier); |
| 2811 | on_each_cpu(hardware_disable, NULL, 1); |
| 2812 | kvm_arch_hardware_unsetup(); |
| 2813 | kvm_arch_exit(); |
| 2814 | kvm_exit_debug(); |
| 2815 | free_cpumask_var(cpus_hardware_enabled); |
| 2816 | __free_page(bad_page); |
| 2817 | } |
| 2818 | EXPORT_SYMBOL_GPL(kvm_exit); |