drivers/kvm/kvm_main.c

   1 /*
   2  * Kernel-based Virtual Machine driver for Linux
   3  *
   4  * This module enables machines with Intel VT-x extensions to run virtual
   5  * machines without emulation or binary translation.
   6  *
   7  * Copyright (C) 2006 Qumranet, Inc.
   8  *
   9  * Authors:
  10  *   Avi Kivity   <[email protected]>
  11  *   Yaniv Kamay  <[email protected]>
  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 "kvm.h"
  19 #include "x86_emulate.h"
  20 #include "segment_descriptor.h"
  21
  22 #include <linux/kvm.h>
  23 #include <linux/module.h>
  24 #include <linux/errno.h>
  25 #include <linux/percpu.h>
  26 #include <linux/gfp.h>
  27 #include <linux/mm.h>
  28 #include <linux/miscdevice.h>
  29 #include <linux/vmalloc.h>
  30 #include <linux/reboot.h>
  31 #include <linux/debugfs.h>
  32 #include <linux/highmem.h>
  33 #include <linux/file.h>
  34 #include <linux/sysdev.h>
  35 #include <linux/cpu.h>
  36 #include <linux/sched.h>
  37 #include <linux/cpumask.h>
  38 #include <linux/smp.h>
  39 #include <linux/anon_inodes.h>
  40
  41 #include <asm/processor.h>
  42 #include <asm/msr.h>
  43 #include <asm/io.h>
  44 #include <asm/uaccess.h>
  45 #include <asm/desc.h>
  46
  47 MODULE_AUTHOR("Qumranet");
  48 MODULE_LICENSE("GPL");
  49
  50 static DEFINE_SPINLOCK(kvm_lock);
  51 static LIST_HEAD(vm_list);
  52
  53 static cpumask_t cpus_hardware_enabled;
  54
  55 struct kvm_arch_ops *kvm_arch_ops;
  56 struct kmem_cache *kvm_vcpu_cache;
  57 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
  58
  59 static __read_mostly struct preempt_ops kvm_preempt_ops;
  60
  61 #define STAT_OFFSET(x) offsetof(struct kvm_vcpu, stat.x)
  62
  63 static struct kvm_stats_debugfs_item {
  64         const char *name;
  65         int offset;
  66         struct dentry *dentry;
  67 } debugfs_entries[] = {
  68         { "pf_fixed", STAT_OFFSET(pf_fixed) },
  69         { "pf_guest", STAT_OFFSET(pf_guest) },
  70         { "tlb_flush", STAT_OFFSET(tlb_flush) },
  71         { "invlpg", STAT_OFFSET(invlpg) },
  72         { "exits", STAT_OFFSET(exits) },
  73         { "io_exits", STAT_OFFSET(io_exits) },
  74         { "mmio_exits", STAT_OFFSET(mmio_exits) },
  75         { "signal_exits", STAT_OFFSET(signal_exits) },
  76         { "irq_window", STAT_OFFSET(irq_window_exits) },
  77         { "halt_exits", STAT_OFFSET(halt_exits) },
  78         { "request_irq", STAT_OFFSET(request_irq_exits) },
  79         { "irq_exits", STAT_OFFSET(irq_exits) },
  80         { "light_exits", STAT_OFFSET(light_exits) },
  81         { "efer_reload", STAT_OFFSET(efer_reload) },
  82         { NULL }
  83 };
  84
  85 static struct dentry *debugfs_dir;
  86
  87 #define MAX_IO_MSRS 256
  88
  89 #define CR0_RESERVED_BITS                                               \
  90         (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
  91                           | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
  92                           | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))
  93 #define CR4_RESERVED_BITS                                               \
  94         (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
  95                           | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE     \
  96                           | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR  \
  97                           | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
  98
  99 #define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
 100 #define EFER_RESERVED_BITS 0xfffffffffffff2fe
 101
 102 #ifdef CONFIG_X86_64
 103 // LDT or TSS descriptor in the GDT. 16 bytes.
 104 struct segment_descriptor_64 {
 105         struct segment_descriptor s;
 106         u32 base_higher;
 107         u32 pad_zero;
 108 };
 109
 110 #endif
 111
 112 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
 113                            unsigned long arg);
 114
 115 unsigned long segment_base(u16 selector)
 116 {
 117         struct descriptor_table gdt;
 118         struct segment_descriptor *d;
 119         unsigned long table_base;
 120         typedef unsigned long ul;
 121         unsigned long v;
 122
 123         if (selector == 0)
 124                 return 0;
 125
 126         asm ("sgdt %0" : "=m"(gdt));
 127         table_base = gdt.base;
 128
 129         if (selector & 4) {           /* from ldt */
 130                 u16 ldt_selector;
 131
 132                 asm ("sldt %0" : "=g"(ldt_selector));
 133                 table_base = segment_base(ldt_selector);
 134         }
 135         d = (struct segment_descriptor *)(table_base + (selector & ~7));
 136         v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
 137 #ifdef CONFIG_X86_64
 138         if (d->system == 0
 139             && (d->type == 2 || d->type == 9 || d->type == 11))
 140                 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
 141 #endif
 142         return v;
 143 }
 144 EXPORT_SYMBOL_GPL(segment_base);
 145
 146 static inline int valid_vcpu(int n)
 147 {
 148         return likely(n >= 0 && n < KVM_MAX_VCPUS);
 149 }
 150
 151 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
 152 {
 153         if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
 154                 return;
 155
 156         vcpu->guest_fpu_loaded = 1;
 157         fx_save(&vcpu->host_fx_image);
 158         fx_restore(&vcpu->guest_fx_image);
 159 }
 160 EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
 161
 162 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
 163 {
 164         if (!vcpu->guest_fpu_loaded)
 165                 return;
 166
 167         vcpu->guest_fpu_loaded = 0;
 168         fx_save(&vcpu->guest_fx_image);
 169         fx_restore(&vcpu->host_fx_image);
 170 }
 171 EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
 172
 173 /*
 174  * Switches to specified vcpu, until a matching vcpu_put()
 175  */
 176 static void vcpu_load(struct kvm_vcpu *vcpu)
 177 {
 178         int cpu;
 179
 180         mutex_lock(&vcpu->mutex);
 181         cpu = get_cpu();
 182         preempt_notifier_register(&vcpu->preempt_notifier);
 183         kvm_arch_ops->vcpu_load(vcpu, cpu);
 184         put_cpu();
 185 }
 186
 187 static void vcpu_put(struct kvm_vcpu *vcpu)
 188 {
 189         preempt_disable();
 190         kvm_arch_ops->vcpu_put(vcpu);
 191         preempt_notifier_unregister(&vcpu->preempt_notifier);
 192         preempt_enable();
 193         mutex_unlock(&vcpu->mutex);
 194 }
 195
 196 static void ack_flush(void *_completed)
 197 {
 198         atomic_t *completed = _completed;
 199
 200         atomic_inc(completed);
 201 }
 202
 203 void kvm_flush_remote_tlbs(struct kvm *kvm)
 204 {
 205         int i, cpu, needed;
 206         cpumask_t cpus;
 207         struct kvm_vcpu *vcpu;
 208         atomic_t completed;
 209
 210         atomic_set(&completed, 0);
 211         cpus_clear(cpus);
 212         needed = 0;
 213         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 214                 vcpu = kvm->vcpus[i];
 215                 if (!vcpu)
 216                         continue;
 217                 if (test_and_set_bit(KVM_TLB_FLUSH, &vcpu->requests))
 218                         continue;
 219                 cpu = vcpu->cpu;
 220                 if (cpu != -1 && cpu != raw_smp_processor_id())
 221                         if (!cpu_isset(cpu, cpus)) {
 222                                 cpu_set(cpu, cpus);
 223                                 ++needed;
 224                         }
 225         }
 226
 227         /*
 228          * We really want smp_call_function_mask() here.  But that's not
 229          * available, so ipi all cpus in parallel and wait for them
 230          * to complete.
 231          */
 232         for (cpu = first_cpu(cpus); cpu != NR_CPUS; cpu = next_cpu(cpu, cpus))
 233                 smp_call_function_single(cpu, ack_flush, &completed, 1, 0);
 234         while (atomic_read(&completed) != needed) {
 235                 cpu_relax();
 236                 barrier();
 237         }
 238 }
 239
 240 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 241 {
 242         struct page *page;
 243         int r;
 244
 245         mutex_init(&vcpu->mutex);
 246         vcpu->cpu = -1;
 247         vcpu->mmu.root_hpa = INVALID_PAGE;
 248         vcpu->kvm = kvm;
 249         vcpu->vcpu_id = id;
 250
 251         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 252         if (!page) {
 253                 r = -ENOMEM;
 254                 goto fail;
 255         }
 256         vcpu->run = page_address(page);
 257
 258         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 259         if (!page) {
 260                 r = -ENOMEM;
 261                 goto fail_free_run;
 262         }
 263         vcpu->pio_data = page_address(page);
 264
 265         r = kvm_mmu_create(vcpu);
 266         if (r < 0)
 267                 goto fail_free_pio_data;
 268
 269         return 0;
 270
 271 fail_free_pio_data:
 272         free_page((unsigned long)vcpu->pio_data);
 273 fail_free_run:
 274         free_page((unsigned long)vcpu->run);
 275 fail:
 276         return -ENOMEM;
 277 }
 278 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
 279
 280 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
 281 {
 282         kvm_mmu_destroy(vcpu);
 283         free_page((unsigned long)vcpu->pio_data);
 284         free_page((unsigned long)vcpu->run);
 285 }
 286 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
 287
 288 static struct kvm *kvm_create_vm(void)
 289 {
 290         struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
 291
 292         if (!kvm)
 293                 return ERR_PTR(-ENOMEM);
 294
 295         kvm_io_bus_init(&kvm->pio_bus);
 296         mutex_init(&kvm->lock);
 297         INIT_LIST_HEAD(&kvm->active_mmu_pages);
 298         kvm_io_bus_init(&kvm->mmio_bus);
 299         spin_lock(&kvm_lock);
 300         list_add(&kvm->vm_list, &vm_list);
 301         spin_unlock(&kvm_lock);
 302         return kvm;
 303 }
 304
 305 /*
 306  * Free any memory in @free but not in @dont.
 307  */
 308 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
 309                                   struct kvm_memory_slot *dont)
 310 {
 311         int i;
 312
 313         if (!dont || free->phys_mem != dont->phys_mem)
 314                 if (free->phys_mem) {
 315                         for (i = 0; i < free->npages; ++i)
 316                                 if (free->phys_mem[i])
 317                                         __free_page(free->phys_mem[i]);
 318                         vfree(free->phys_mem);
 319                 }
 320
 321         if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
 322                 vfree(free->dirty_bitmap);
 323
 324         free->phys_mem = NULL;
 325         free->npages = 0;
 326         free->dirty_bitmap = NULL;
 327 }
 328
 329 static void kvm_free_physmem(struct kvm *kvm)
 330 {
 331         int i;
 332
 333         for (i = 0; i < kvm->nmemslots; ++i)
 334                 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
 335 }
 336
 337 static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
 338 {
 339         int i;
 340
 341         for (i = 0; i < ARRAY_SIZE(vcpu->pio.guest_pages); ++i)
 342                 if (vcpu->pio.guest_pages[i]) {
 343                         __free_page(vcpu->pio.guest_pages[i]);
 344                         vcpu->pio.guest_pages[i] = NULL;
 345                 }
 346 }
 347
 348 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
 349 {
 350         vcpu_load(vcpu);
 351         kvm_mmu_unload(vcpu);
 352         vcpu_put(vcpu);
 353 }
 354
 355 static void kvm_free_vcpus(struct kvm *kvm)
 356 {
 357         unsigned int i;
 358
 359         /*
 360          * Unpin any mmu pages first.
 361          */
 362         for (i = 0; i < KVM_MAX_VCPUS; ++i)
 363                 if (kvm->vcpus[i])
 364                         kvm_unload_vcpu_mmu(kvm->vcpus[i]);
 365         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 366                 if (kvm->vcpus[i]) {
 367                         kvm_arch_ops->vcpu_free(kvm->vcpus[i]);
 368                         kvm->vcpus[i] = NULL;
 369                 }
 370         }
 371
 372 }
 373
 374 static void kvm_destroy_vm(struct kvm *kvm)
 375 {
 376         spin_lock(&kvm_lock);
 377         list_del(&kvm->vm_list);
 378         spin_unlock(&kvm_lock);
 379         kvm_io_bus_destroy(&kvm->pio_bus);
 380         kvm_io_bus_destroy(&kvm->mmio_bus);
 381         kvm_free_vcpus(kvm);
 382         kvm_free_physmem(kvm);
 383         kfree(kvm);
 384 }
 385
 386 static int kvm_vm_release(struct inode *inode, struct file *filp)
 387 {
 388         struct kvm *kvm = filp->private_data;
 389
 390         kvm_destroy_vm(kvm);
 391         return 0;
 392 }
 393
 394 static void inject_gp(struct kvm_vcpu *vcpu)
 395 {
 396         kvm_arch_ops->inject_gp(vcpu, 0);
 397 }
 398
 399 /*
 400  * Load the pae pdptrs.  Return true is they are all valid.
 401  */
 402 static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
 403 {
 404         gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
 405         unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
 406         int i;
 407         u64 *pdpt;
 408         int ret;
 409         struct page *page;
 410         u64 pdpte[ARRAY_SIZE(vcpu->pdptrs)];
 411
 412         mutex_lock(&vcpu->kvm->lock);
 413         page = gfn_to_page(vcpu->kvm, pdpt_gfn);
 414         if (!page) {
 415                 ret = 0;
 416                 goto out;
 417         }
 418
 419         pdpt = kmap_atomic(page, KM_USER0);
 420         memcpy(pdpte, pdpt+offset, sizeof(pdpte));
 421         kunmap_atomic(pdpt, KM_USER0);
 422
 423         for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
 424                 if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) {
 425                         ret = 0;
 426                         goto out;
 427                 }
 428         }
 429         ret = 1;
 430
 431         memcpy(vcpu->pdptrs, pdpte, sizeof(vcpu->pdptrs));
 432 out:
 433         mutex_unlock(&vcpu->kvm->lock);
 434
 435         return ret;
 436 }
 437
 438 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 439 {
 440         if (cr0 & CR0_RESERVED_BITS) {
 441                 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
 442                        cr0, vcpu->cr0);
 443                 inject_gp(vcpu);
 444                 return;
 445         }
 446
 447         if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) {
 448                 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
 449                 inject_gp(vcpu);
 450                 return;
 451         }
 452
 453         if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) {
 454                 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
 455                        "and a clear PE flag\n");
 456                 inject_gp(vcpu);
 457                 return;
 458         }
 459
 460         if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
 461 #ifdef CONFIG_X86_64
 462                 if ((vcpu->shadow_efer & EFER_LME)) {
 463                         int cs_db, cs_l;
 464
 465                         if (!is_pae(vcpu)) {
 466                                 printk(KERN_DEBUG "set_cr0: #GP, start paging "
 467                                        "in long mode while PAE is disabled\n");
 468                                 inject_gp(vcpu);
 469                                 return;
 470                         }
 471                         kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
 472                         if (cs_l) {
 473                                 printk(KERN_DEBUG "set_cr0: #GP, start paging "
 474                                        "in long mode while CS.L == 1\n");
 475                                 inject_gp(vcpu);
 476                                 return;
 477
 478                         }
 479                 } else
 480 #endif
 481                 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
 482                         printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
 483                                "reserved bits\n");
 484                         inject_gp(vcpu);
 485                         return;
 486                 }
 487
 488         }
 489
 490         kvm_arch_ops->set_cr0(vcpu, cr0);
 491         vcpu->cr0 = cr0;
 492
 493         mutex_lock(&vcpu->kvm->lock);
 494         kvm_mmu_reset_context(vcpu);
 495         mutex_unlock(&vcpu->kvm->lock);
 496         return;
 497 }
 498 EXPORT_SYMBOL_GPL(set_cr0);
 499
 500 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
 501 {
 502         set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
 503 }
 504 EXPORT_SYMBOL_GPL(lmsw);
 505
 506 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
 507 {
 508         if (cr4 & CR4_RESERVED_BITS) {
 509                 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
 510                 inject_gp(vcpu);
 511                 return;
 512         }
 513
 514         if (is_long_mode(vcpu)) {
 515                 if (!(cr4 & X86_CR4_PAE)) {
 516                         printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
 517                                "in long mode\n");
 518                         inject_gp(vcpu);
 519                         return;
 520                 }
 521         } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & X86_CR4_PAE)
 522                    && !load_pdptrs(vcpu, vcpu->cr3)) {
 523                 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
 524                 inject_gp(vcpu);
 525                 return;
 526         }
 527
 528         if (cr4 & X86_CR4_VMXE) {
 529                 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
 530                 inject_gp(vcpu);
 531                 return;
 532         }
 533         kvm_arch_ops->set_cr4(vcpu, cr4);
 534         mutex_lock(&vcpu->kvm->lock);
 535         kvm_mmu_reset_context(vcpu);
 536         mutex_unlock(&vcpu->kvm->lock);
 537 }
 538 EXPORT_SYMBOL_GPL(set_cr4);
 539
 540 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
 541 {
 542         if (is_long_mode(vcpu)) {
 543                 if (cr3 & CR3_L_MODE_RESERVED_BITS) {
 544                         printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
 545                         inject_gp(vcpu);
 546                         return;
 547                 }
 548         } else {
 549                 if (is_pae(vcpu)) {
 550                         if (cr3 & CR3_PAE_RESERVED_BITS) {
 551                                 printk(KERN_DEBUG
 552                                        "set_cr3: #GP, reserved bits\n");
 553                                 inject_gp(vcpu);
 554                                 return;
 555                         }
 556                         if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) {
 557                                 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
 558                                        "reserved bits\n");
 559                                 inject_gp(vcpu);
 560                                 return;
 561                         }
 562                 } else {
 563                         if (cr3 & CR3_NONPAE_RESERVED_BITS) {
 564                                 printk(KERN_DEBUG
 565                                        "set_cr3: #GP, reserved bits\n");
 566                                 inject_gp(vcpu);
 567                                 return;
 568                         }
 569                 }
 570         }
 571
 572         mutex_lock(&vcpu->kvm->lock);
 573         /*
 574          * Does the new cr3 value map to physical memory? (Note, we
 575          * catch an invalid cr3 even in real-mode, because it would
 576          * cause trouble later on when we turn on paging anyway.)
 577          *
 578          * A real CPU would silently accept an invalid cr3 and would
 579          * attempt to use it - with largely undefined (and often hard
 580          * to debug) behavior on the guest side.
 581          */
 582         if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
 583                 inject_gp(vcpu);
 584         else {
 585                 vcpu->cr3 = cr3;
 586                 vcpu->mmu.new_cr3(vcpu);
 587         }
 588         mutex_unlock(&vcpu->kvm->lock);
 589 }
 590 EXPORT_SYMBOL_GPL(set_cr3);
 591
 592 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
 593 {
 594         if (cr8 & CR8_RESERVED_BITS) {
 595                 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
 596                 inject_gp(vcpu);
 597                 return;
 598         }
 599         vcpu->cr8 = cr8;
 600 }
 601 EXPORT_SYMBOL_GPL(set_cr8);
 602
 603 void fx_init(struct kvm_vcpu *vcpu)
 604 {
 605         unsigned after_mxcsr_mask;
 606
 607         /* Initialize guest FPU by resetting ours and saving into guest's */
 608         preempt_disable();
 609         fx_save(&vcpu->host_fx_image);
 610         fpu_init();
 611         fx_save(&vcpu->guest_fx_image);
 612         fx_restore(&vcpu->host_fx_image);
 613         preempt_enable();
 614
 615         after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
 616         vcpu->guest_fx_image.mxcsr = 0x1f80;
 617         memset((void *)&vcpu->guest_fx_image + after_mxcsr_mask,
 618                0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
 619 }
 620 EXPORT_SYMBOL_GPL(fx_init);
 621
 622 /*
 623  * Allocate some memory and give it an address in the guest physical address
 624  * space.
 625  *
 626  * Discontiguous memory is allowed, mostly for framebuffers.
 627  */
 628 static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
 629                                           struct kvm_memory_region *mem)
 630 {
 631         int r;
 632         gfn_t base_gfn;
 633         unsigned long npages;
 634         unsigned long i;
 635         struct kvm_memory_slot *memslot;
 636         struct kvm_memory_slot old, new;
 637         int memory_config_version;
 638
 639         r = -EINVAL;
 640         /* General sanity checks */
 641         if (mem->memory_size & (PAGE_SIZE - 1))
 642                 goto out;
 643         if (mem->guest_phys_addr & (PAGE_SIZE - 1))
 644                 goto out;
 645         if (mem->slot >= KVM_MEMORY_SLOTS)
 646                 goto out;
 647         if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
 648                 goto out;
 649
 650         memslot = &kvm->memslots[mem->slot];
 651         base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
 652         npages = mem->memory_size >> PAGE_SHIFT;
 653
 654         if (!npages)
 655                 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
 656
 657 raced:
 658         mutex_lock(&kvm->lock);
 659
 660         memory_config_version = kvm->memory_config_version;
 661         new = old = *memslot;
 662
 663         new.base_gfn = base_gfn;
 664         new.npages = npages;
 665         new.flags = mem->flags;
 666
 667         /* Disallow changing a memory slot's size. */
 668         r = -EINVAL;
 669         if (npages && old.npages && npages != old.npages)
 670                 goto out_unlock;
 671
 672         /* Check for overlaps */
 673         r = -EEXIST;
 674         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
 675                 struct kvm_memory_slot *s = &kvm->memslots[i];
 676
 677                 if (s == memslot)
 678                         continue;
 679                 if (!((base_gfn + npages <= s->base_gfn) ||
 680                       (base_gfn >= s->base_gfn + s->npages)))
 681                         goto out_unlock;
 682         }
 683         /*
 684          * Do memory allocations outside lock.  memory_config_version will
 685          * detect any races.
 686          */
 687         mutex_unlock(&kvm->lock);
 688
 689         /* Deallocate if slot is being removed */
 690         if (!npages)
 691                 new.phys_mem = NULL;
 692
 693         /* Free page dirty bitmap if unneeded */
 694         if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
 695                 new.dirty_bitmap = NULL;
 696
 697         r = -ENOMEM;
 698
 699         /* Allocate if a slot is being created */
 700         if (npages && !new.phys_mem) {
 701                 new.phys_mem = vmalloc(npages * sizeof(struct page *));
 702
 703                 if (!new.phys_mem)
 704                         goto out_free;
 705
 706                 memset(new.phys_mem, 0, npages * sizeof(struct page *));
 707                 for (i = 0; i < npages; ++i) {
 708                         new.phys_mem[i] = alloc_page(GFP_HIGHUSER
 709                                                      | __GFP_ZERO);
 710                         if (!new.phys_mem[i])
 711                                 goto out_free;
 712                         set_page_private(new.phys_mem[i],0);
 713                 }
 714         }
 715
 716         /* Allocate page dirty bitmap if needed */
 717         if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
 718                 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
 719
 720                 new.dirty_bitmap = vmalloc(dirty_bytes);
 721                 if (!new.dirty_bitmap)
 722                         goto out_free;
 723                 memset(new.dirty_bitmap, 0, dirty_bytes);
 724         }
 725
 726         mutex_lock(&kvm->lock);
 727
 728         if (memory_config_version != kvm->memory_config_version) {
 729                 mutex_unlock(&kvm->lock);
 730                 kvm_free_physmem_slot(&new, &old);
 731                 goto raced;
 732         }
 733
 734         r = -EAGAIN;
 735         if (kvm->busy)
 736                 goto out_unlock;
 737
 738         if (mem->slot >= kvm->nmemslots)
 739                 kvm->nmemslots = mem->slot + 1;
 740
 741         *memslot = new;
 742         ++kvm->memory_config_version;
 743
 744         kvm_mmu_slot_remove_write_access(kvm, mem->slot);
 745         kvm_flush_remote_tlbs(kvm);
 746
 747         mutex_unlock(&kvm->lock);
 748
 749         kvm_free_physmem_slot(&old, &new);
 750         return 0;
 751
 752 out_unlock:
 753         mutex_unlock(&kvm->lock);
 754 out_free:
 755         kvm_free_physmem_slot(&new, &old);
 756 out:
 757         return r;
 758 }
 759
 760 /*
 761  * Get (and clear) the dirty memory log for a memory slot.
 762  */
 763 static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 764                                       struct kvm_dirty_log *log)
 765 {
 766         struct kvm_memory_slot *memslot;
 767         int r, i;
 768         int n;
 769         unsigned long any = 0;
 770
 771         mutex_lock(&kvm->lock);
 772
 773         /*
 774          * Prevent changes to guest memory configuration even while the lock
 775          * is not taken.
 776          */
 777         ++kvm->busy;
 778         mutex_unlock(&kvm->lock);
 779         r = -EINVAL;
 780         if (log->slot >= KVM_MEMORY_SLOTS)
 781                 goto out;
 782
 783         memslot = &kvm->memslots[log->slot];
 784         r = -ENOENT;
 785         if (!memslot->dirty_bitmap)
 786                 goto out;
 787
 788         n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
 789
 790         for (i = 0; !any && i < n/sizeof(long); ++i)
 791                 any = memslot->dirty_bitmap[i];
 792
 793         r = -EFAULT;
 794         if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
 795                 goto out;
 796
 797         /* If nothing is dirty, don't bother messing with page tables. */
 798         if (any) {
 799                 mutex_lock(&kvm->lock);
 800                 kvm_mmu_slot_remove_write_access(kvm, log->slot);
 801                 kvm_flush_remote_tlbs(kvm);
 802                 memset(memslot->dirty_bitmap, 0, n);
 803                 mutex_unlock(&kvm->lock);
 804         }
 805
 806         r = 0;
 807
 808 out:
 809         mutex_lock(&kvm->lock);
 810         --kvm->busy;
 811         mutex_unlock(&kvm->lock);
 812         return r;
 813 }
 814
 815 /*
 816  * Set a new alias region.  Aliases map a portion of physical memory into
 817  * another portion.  This is useful for memory windows, for example the PC
 818  * VGA region.
 819  */
 820 static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
 821                                          struct kvm_memory_alias *alias)
 822 {
 823         int r, n;
 824         struct kvm_mem_alias *p;
 825
 826         r = -EINVAL;
 827         /* General sanity checks */
 828         if (alias->memory_size & (PAGE_SIZE - 1))
 829                 goto out;
 830         if (alias->guest_phys_addr & (PAGE_SIZE - 1))
 831                 goto out;
 832         if (alias->slot >= KVM_ALIAS_SLOTS)
 833                 goto out;
 834         if (alias->guest_phys_addr + alias->memory_size
 835             < alias->guest_phys_addr)
 836                 goto out;
 837         if (alias->target_phys_addr + alias->memory_size
 838             < alias->target_phys_addr)
 839                 goto out;
 840
 841         mutex_lock(&kvm->lock);
 842
 843         p = &kvm->aliases[alias->slot];
 844         p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
 845         p->npages = alias->memory_size >> PAGE_SHIFT;
 846         p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
 847
 848         for (n = KVM_ALIAS_SLOTS; n > 0; --n)
 849                 if (kvm->aliases[n - 1].npages)
 850                         break;
 851         kvm->naliases = n;
 852
 853         kvm_mmu_zap_all(kvm);
 854
 855         mutex_unlock(&kvm->lock);
 856
 857         return 0;
 858
 859 out:
 860         return r;
 861 }
 862
 863 static gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
 864 {
 865         int i;
 866         struct kvm_mem_alias *alias;
 867
 868         for (i = 0; i < kvm->naliases; ++i) {
 869                 alias = &kvm->aliases[i];
 870                 if (gfn >= alias->base_gfn
 871                     && gfn < alias->base_gfn + alias->npages)
 872                         return alias->target_gfn + gfn - alias->base_gfn;
 873         }
 874         return gfn;
 875 }
 876
 877 static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
 878 {
 879         int i;
 880
 881         for (i = 0; i < kvm->nmemslots; ++i) {
 882                 struct kvm_memory_slot *memslot = &kvm->memslots[i];
 883
 884                 if (gfn >= memslot->base_gfn
 885                     && gfn < memslot->base_gfn + memslot->npages)
 886                         return memslot;
 887         }
 888         return NULL;
 889 }
 890
 891 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
 892 {
 893         gfn = unalias_gfn(kvm, gfn);
 894         return __gfn_to_memslot(kvm, gfn);
 895 }
 896
 897 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
 898 {
 899         struct kvm_memory_slot *slot;
 900
 901         gfn = unalias_gfn(kvm, gfn);
 902         slot = __gfn_to_memslot(kvm, gfn);
 903         if (!slot)
 904                 return NULL;
 905         return slot->phys_mem[gfn - slot->base_gfn];
 906 }
 907 EXPORT_SYMBOL_GPL(gfn_to_page);
 908
 909 /* WARNING: Does not work on aliased pages. */
 910 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
 911 {
 912         struct kvm_memory_slot *memslot;
 913
 914         memslot = __gfn_to_memslot(kvm, gfn);
 915         if (memslot && memslot->dirty_bitmap) {
 916                 unsigned long rel_gfn = gfn - memslot->base_gfn;
 917
 918                 /* avoid RMW */
 919                 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
 920                         set_bit(rel_gfn, memslot->dirty_bitmap);
 921         }
 922 }
 923
 924 int emulator_read_std(unsigned long addr,
 925                              void *val,
 926                              unsigned int bytes,
 927                              struct kvm_vcpu *vcpu)
 928 {
 929         void *data = val;
 930
 931         while (bytes) {
 932                 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
 933                 unsigned offset = addr & (PAGE_SIZE-1);
 934                 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
 935                 unsigned long pfn;
 936                 struct page *page;
 937                 void *page_virt;
 938
 939                 if (gpa == UNMAPPED_GVA)
 940                         return X86EMUL_PROPAGATE_FAULT;
 941                 pfn = gpa >> PAGE_SHIFT;
 942                 page = gfn_to_page(vcpu->kvm, pfn);
 943                 if (!page)
 944                         return X86EMUL_UNHANDLEABLE;
 945                 page_virt = kmap_atomic(page, KM_USER0);
 946
 947                 memcpy(data, page_virt + offset, tocopy);
 948
 949                 kunmap_atomic(page_virt, KM_USER0);
 950
 951                 bytes -= tocopy;
 952                 data += tocopy;
 953                 addr += tocopy;
 954         }
 955
 956         return X86EMUL_CONTINUE;
 957 }
 958 EXPORT_SYMBOL_GPL(emulator_read_std);
 959
 960 static int emulator_write_std(unsigned long addr,
 961                               const void *val,
 962                               unsigned int bytes,
 963                               struct kvm_vcpu *vcpu)
 964 {
 965         pr_unimpl(vcpu, "emulator_write_std: addr %lx n %d\n", addr, bytes);
 966         return X86EMUL_UNHANDLEABLE;
 967 }
 968
 969 static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
 970                                                 gpa_t addr)
 971 {
 972         /*
 973          * Note that its important to have this wrapper function because
 974          * in the very near future we will be checking for MMIOs against
 975          * the LAPIC as well as the general MMIO bus
 976          */
 977         return kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
 978 }
 979
 980 static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
 981                                                gpa_t addr)
 982 {
 983         return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
 984 }
 985
 986 static int emulator_read_emulated(unsigned long addr,
 987                                   void *val,
 988                                   unsigned int bytes,
 989                                   struct kvm_vcpu *vcpu)
 990 {
 991         struct kvm_io_device *mmio_dev;
 992         gpa_t                 gpa;
 993
 994         if (vcpu->mmio_read_completed) {
 995                 memcpy(val, vcpu->mmio_data, bytes);
 996                 vcpu->mmio_read_completed = 0;
 997                 return X86EMUL_CONTINUE;
 998         } else if (emulator_read_std(addr, val, bytes, vcpu)
 999                    == X86EMUL_CONTINUE)
1000                 return X86EMUL_CONTINUE;
1001
1002         gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1003         if (gpa == UNMAPPED_GVA)
1004                 return X86EMUL_PROPAGATE_FAULT;
1005
1006         /*
1007          * Is this MMIO handled locally?
1008          */
1009         mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1010         if (mmio_dev) {
1011                 kvm_iodevice_read(mmio_dev, gpa, bytes, val);
1012                 return X86EMUL_CONTINUE;
1013         }
1014
1015         vcpu->mmio_needed = 1;
1016         vcpu->mmio_phys_addr = gpa;
1017         vcpu->mmio_size = bytes;
1018         vcpu->mmio_is_write = 0;
1019
1020         return X86EMUL_UNHANDLEABLE;
1021 }
1022
1023 static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
1024                                const void *val, int bytes)
1025 {
1026         struct page *page;
1027         void *virt;
1028
1029         if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
1030                 return 0;
1031         page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
1032         if (!page)
1033                 return 0;
1034         mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
1035         virt = kmap_atomic(page, KM_USER0);
1036         kvm_mmu_pte_write(vcpu, gpa, val, bytes);
1037         memcpy(virt + offset_in_page(gpa), val, bytes);
1038         kunmap_atomic(virt, KM_USER0);
1039         return 1;
1040 }
1041
1042 static int emulator_write_emulated_onepage(unsigned long addr,
1043                                            const void *val,
1044                                            unsigned int bytes,
1045                                            struct kvm_vcpu *vcpu)
1046 {
1047         struct kvm_io_device *mmio_dev;
1048         gpa_t                 gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1049
1050         if (gpa == UNMAPPED_GVA) {
1051                 kvm_arch_ops->inject_page_fault(vcpu, addr, 2);
1052                 return X86EMUL_PROPAGATE_FAULT;
1053         }
1054
1055         if (emulator_write_phys(vcpu, gpa, val, bytes))
1056                 return X86EMUL_CONTINUE;
1057
1058         /*
1059          * Is this MMIO handled locally?
1060          */
1061         mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1062         if (mmio_dev) {
1063                 kvm_iodevice_write(mmio_dev, gpa, bytes, val);
1064                 return X86EMUL_CONTINUE;
1065         }
1066
1067         vcpu->mmio_needed = 1;
1068         vcpu->mmio_phys_addr = gpa;
1069         vcpu->mmio_size = bytes;
1070         vcpu->mmio_is_write = 1;
1071         memcpy(vcpu->mmio_data, val, bytes);
1072
1073         return X86EMUL_CONTINUE;
1074 }
1075
1076 int emulator_write_emulated(unsigned long addr,
1077                                    const void *val,
1078                                    unsigned int bytes,
1079                                    struct kvm_vcpu *vcpu)
1080 {
1081         /* Crossing a page boundary? */
1082         if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
1083                 int rc, now;
1084
1085                 now = -addr & ~PAGE_MASK;
1086                 rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
1087                 if (rc != X86EMUL_CONTINUE)
1088                         return rc;
1089                 addr += now;
1090                 val += now;
1091                 bytes -= now;
1092         }
1093         return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
1094 }
1095 EXPORT_SYMBOL_GPL(emulator_write_emulated);
1096
1097 static int emulator_cmpxchg_emulated(unsigned long addr,
1098                                      const void *old,
1099                                      const void *new,
1100                                      unsigned int bytes,
1101                                      struct kvm_vcpu *vcpu)
1102 {
1103         static int reported;
1104
1105         if (!reported) {
1106                 reported = 1;
1107                 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1108         }
1109         return emulator_write_emulated(addr, new, bytes, vcpu);
1110 }
1111
1112 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1113 {
1114         return kvm_arch_ops->get_segment_base(vcpu, seg);
1115 }
1116
1117 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1118 {
1119         return X86EMUL_CONTINUE;
1120 }
1121
1122 int emulate_clts(struct kvm_vcpu *vcpu)
1123 {
1124         unsigned long cr0;
1125
1126         cr0 = vcpu->cr0 & ~X86_CR0_TS;
1127         kvm_arch_ops->set_cr0(vcpu, cr0);
1128         return X86EMUL_CONTINUE;
1129 }
1130
1131 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1132 {
1133         struct kvm_vcpu *vcpu = ctxt->vcpu;
1134
1135         switch (dr) {
1136         case 0 ... 3:
1137                 *dest = kvm_arch_ops->get_dr(vcpu, dr);
1138                 return X86EMUL_CONTINUE;
1139         default:
1140                 pr_unimpl(vcpu, "%s: unexpected dr %u\n", __FUNCTION__, dr);
1141                 return X86EMUL_UNHANDLEABLE;
1142         }
1143 }
1144
1145 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1146 {
1147         unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1148         int exception;
1149
1150         kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1151         if (exception) {
1152                 /* FIXME: better handling */
1153                 return X86EMUL_UNHANDLEABLE;
1154         }
1155         return X86EMUL_CONTINUE;
1156 }
1157
1158 static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1159 {
1160         static int reported;
1161         u8 opcodes[4];
1162         unsigned long rip = ctxt->vcpu->rip;
1163         unsigned long rip_linear;
1164
1165         rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1166
1167         if (reported)
1168                 return;
1169
1170         emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt->vcpu);
1171
1172         printk(KERN_ERR "emulation failed but !mmio_needed?"
1173                " rip %lx %02x %02x %02x %02x\n",
1174                rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1175         reported = 1;
1176 }
1177
1178 struct x86_emulate_ops emulate_ops = {
1179         .read_std            = emulator_read_std,
1180         .write_std           = emulator_write_std,
1181         .read_emulated       = emulator_read_emulated,
1182         .write_emulated      = emulator_write_emulated,
1183         .cmpxchg_emulated    = emulator_cmpxchg_emulated,
1184 };
1185
1186 int emulate_instruction(struct kvm_vcpu *vcpu,
1187                         struct kvm_run *run,
1188                         unsigned long cr2,
1189                         u16 error_code)
1190 {
1191         struct x86_emulate_ctxt emulate_ctxt;
1192         int r;
1193         int cs_db, cs_l;
1194
1195         vcpu->mmio_fault_cr2 = cr2;
1196         kvm_arch_ops->cache_regs(vcpu);
1197
1198         kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1199
1200         emulate_ctxt.vcpu = vcpu;
1201         emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1202         emulate_ctxt.cr2 = cr2;
1203         emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1204                 ? X86EMUL_MODE_REAL : cs_l
1205                 ? X86EMUL_MODE_PROT64 : cs_db
1206                 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1207
1208         if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1209                 emulate_ctxt.cs_base = 0;
1210                 emulate_ctxt.ds_base = 0;
1211                 emulate_ctxt.es_base = 0;
1212                 emulate_ctxt.ss_base = 0;
1213         } else {
1214                 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1215                 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1216                 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1217                 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1218         }
1219
1220         emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1221         emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1222
1223         vcpu->mmio_is_write = 0;
1224         r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1225
1226         if ((r || vcpu->mmio_is_write) && run) {
1227                 run->exit_reason = KVM_EXIT_MMIO;
1228                 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1229                 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1230                 run->mmio.len = vcpu->mmio_size;
1231                 run->mmio.is_write = vcpu->mmio_is_write;
1232         }
1233
1234         if (r) {
1235                 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1236                         return EMULATE_DONE;
1237                 if (!vcpu->mmio_needed) {
1238                         report_emulation_failure(&emulate_ctxt);
1239                         return EMULATE_FAIL;
1240                 }
1241                 return EMULATE_DO_MMIO;
1242         }
1243
1244         kvm_arch_ops->decache_regs(vcpu);
1245         kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1246
1247         if (vcpu->mmio_is_write) {
1248                 vcpu->mmio_needed = 0;
1249                 return EMULATE_DO_MMIO;
1250         }
1251
1252         return EMULATE_DONE;
1253 }
1254 EXPORT_SYMBOL_GPL(emulate_instruction);
1255
1256 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
1257 {
1258         if (vcpu->irq_summary)
1259                 return 1;
1260
1261         vcpu->run->exit_reason = KVM_EXIT_HLT;
1262         ++vcpu->stat.halt_exits;
1263         return 0;
1264 }
1265 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
1266
1267 int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run)
1268 {
1269         unsigned long nr, a0, a1, a2, a3, a4, a5, ret;
1270
1271         kvm_arch_ops->cache_regs(vcpu);
1272         ret = -KVM_EINVAL;
1273 #ifdef CONFIG_X86_64
1274         if (is_long_mode(vcpu)) {
1275                 nr = vcpu->regs[VCPU_REGS_RAX];
1276                 a0 = vcpu->regs[VCPU_REGS_RDI];
1277                 a1 = vcpu->regs[VCPU_REGS_RSI];
1278                 a2 = vcpu->regs[VCPU_REGS_RDX];
1279                 a3 = vcpu->regs[VCPU_REGS_RCX];
1280                 a4 = vcpu->regs[VCPU_REGS_R8];
1281                 a5 = vcpu->regs[VCPU_REGS_R9];
1282         } else
1283 #endif
1284         {
1285                 nr = vcpu->regs[VCPU_REGS_RBX] & -1u;
1286                 a0 = vcpu->regs[VCPU_REGS_RAX] & -1u;
1287                 a1 = vcpu->regs[VCPU_REGS_RCX] & -1u;
1288                 a2 = vcpu->regs[VCPU_REGS_RDX] & -1u;
1289                 a3 = vcpu->regs[VCPU_REGS_RSI] & -1u;
1290                 a4 = vcpu->regs[VCPU_REGS_RDI] & -1u;
1291                 a5 = vcpu->regs[VCPU_REGS_RBP] & -1u;
1292         }
1293         switch (nr) {
1294         default:
1295                 run->hypercall.nr = nr;
1296                 run->hypercall.args[0] = a0;
1297                 run->hypercall.args[1] = a1;
1298                 run->hypercall.args[2] = a2;
1299                 run->hypercall.args[3] = a3;
1300                 run->hypercall.args[4] = a4;
1301                 run->hypercall.args[5] = a5;
1302                 run->hypercall.ret = ret;
1303                 run->hypercall.longmode = is_long_mode(vcpu);
1304                 kvm_arch_ops->decache_regs(vcpu);
1305                 return 0;
1306         }
1307         vcpu->regs[VCPU_REGS_RAX] = ret;
1308         kvm_arch_ops->decache_regs(vcpu);
1309         return 1;
1310 }
1311 EXPORT_SYMBOL_GPL(kvm_hypercall);
1312
1313 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1314 {
1315         return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1316 }
1317
1318 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1319 {
1320         struct descriptor_table dt = { limit, base };
1321
1322         kvm_arch_ops->set_gdt(vcpu, &dt);
1323 }
1324
1325 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1326 {
1327         struct descriptor_table dt = { limit, base };
1328
1329         kvm_arch_ops->set_idt(vcpu, &dt);
1330 }
1331
1332 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1333                    unsigned long *rflags)
1334 {
1335         lmsw(vcpu, msw);
1336         *rflags = kvm_arch_ops->get_rflags(vcpu);
1337 }
1338
1339 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1340 {
1341         kvm_arch_ops->decache_cr4_guest_bits(vcpu);
1342         switch (cr) {
1343         case 0:
1344                 return vcpu->cr0;
1345         case 2:
1346                 return vcpu->cr2;
1347         case 3:
1348                 return vcpu->cr3;
1349         case 4:
1350                 return vcpu->cr4;
1351         default:
1352                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1353                 return 0;
1354         }
1355 }
1356
1357 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1358                      unsigned long *rflags)
1359 {
1360         switch (cr) {
1361         case 0:
1362                 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1363                 *rflags = kvm_arch_ops->get_rflags(vcpu);
1364                 break;
1365         case 2:
1366                 vcpu->cr2 = val;
1367                 break;
1368         case 3:
1369                 set_cr3(vcpu, val);
1370                 break;
1371         case 4:
1372                 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1373                 break;
1374         default:
1375                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1376         }
1377 }
1378
1379 /*
1380  * Register the para guest with the host:
1381  */
1382 static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa)
1383 {
1384         struct kvm_vcpu_para_state *para_state;
1385         hpa_t para_state_hpa, hypercall_hpa;
1386         struct page *para_state_page;
1387         unsigned char *hypercall;
1388         gpa_t hypercall_gpa;
1389
1390         printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n");
1391         printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa);
1392
1393         /*
1394          * Needs to be page aligned:
1395          */
1396         if (para_state_gpa != PAGE_ALIGN(para_state_gpa))
1397                 goto err_gp;
1398
1399         para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa);
1400         printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa);
1401         if (is_error_hpa(para_state_hpa))
1402                 goto err_gp;
1403
1404         mark_page_dirty(vcpu->kvm, para_state_gpa >> PAGE_SHIFT);
1405         para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT);
1406         para_state = kmap(para_state_page);
1407
1408         printk(KERN_DEBUG "....  guest version: %d\n", para_state->guest_version);
1409         printk(KERN_DEBUG "....           size: %d\n", para_state->size);
1410
1411         para_state->host_version = KVM_PARA_API_VERSION;
1412         /*
1413          * We cannot support guests that try to register themselves
1414          * with a newer API version than the host supports:
1415          */
1416         if (para_state->guest_version > KVM_PARA_API_VERSION) {
1417                 para_state->ret = -KVM_EINVAL;
1418                 goto err_kunmap_skip;
1419         }
1420
1421         hypercall_gpa = para_state->hypercall_gpa;
1422         hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa);
1423         printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa);
1424         if (is_error_hpa(hypercall_hpa)) {
1425                 para_state->ret = -KVM_EINVAL;
1426                 goto err_kunmap_skip;
1427         }
1428
1429         printk(KERN_DEBUG "kvm: para guest successfully registered.\n");
1430         vcpu->para_state_page = para_state_page;
1431         vcpu->para_state_gpa = para_state_gpa;
1432         vcpu->hypercall_gpa = hypercall_gpa;
1433
1434         mark_page_dirty(vcpu->kvm, hypercall_gpa >> PAGE_SHIFT);
1435         hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT),
1436                                 KM_USER1) + (hypercall_hpa & ~PAGE_MASK);
1437         kvm_arch_ops->patch_hypercall(vcpu, hypercall);
1438         kunmap_atomic(hypercall, KM_USER1);
1439
1440         para_state->ret = 0;
1441 err_kunmap_skip:
1442         kunmap(para_state_page);
1443         return 0;
1444 err_gp:
1445         return 1;
1446 }
1447
1448 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1449 {
1450         u64 data;
1451
1452         switch (msr) {
1453         case 0xc0010010: /* SYSCFG */
1454         case 0xc0010015: /* HWCR */
1455         case MSR_IA32_PLATFORM_ID:
1456         case MSR_IA32_P5_MC_ADDR:
1457         case MSR_IA32_P5_MC_TYPE:
1458         case MSR_IA32_MC0_CTL:
1459         case MSR_IA32_MCG_STATUS:
1460         case MSR_IA32_MCG_CAP:
1461         case MSR_IA32_MC0_MISC:
1462         case MSR_IA32_MC0_MISC+4:
1463         case MSR_IA32_MC0_MISC+8:
1464         case MSR_IA32_MC0_MISC+12:
1465         case MSR_IA32_MC0_MISC+16:
1466         case MSR_IA32_UCODE_REV:
1467         case MSR_IA32_PERF_STATUS:
1468         case MSR_IA32_EBL_CR_POWERON:
1469                 /* MTRR registers */
1470         case 0xfe:
1471         case 0x200 ... 0x2ff:
1472                 data = 0;
1473                 break;
1474         case 0xcd: /* fsb frequency */
1475                 data = 3;
1476                 break;
1477         case MSR_IA32_APICBASE:
1478                 data = vcpu->apic_base;
1479                 break;
1480         case MSR_IA32_MISC_ENABLE:
1481                 data = vcpu->ia32_misc_enable_msr;
1482                 break;
1483 #ifdef CONFIG_X86_64
1484         case MSR_EFER:
1485                 data = vcpu->shadow_efer;
1486                 break;
1487 #endif
1488         default:
1489                 pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
1490                 return 1;
1491         }
1492         *pdata = data;
1493         return 0;
1494 }
1495 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1496
1497 /*
1498  * Reads an msr value (of 'msr_index') into 'pdata'.
1499  * Returns 0 on success, non-0 otherwise.
1500  * Assumes vcpu_load() was already called.
1501  */
1502 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1503 {
1504         return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1505 }
1506
1507 #ifdef CONFIG_X86_64
1508
1509 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
1510 {
1511         if (efer & EFER_RESERVED_BITS) {
1512                 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1513                        efer);
1514                 inject_gp(vcpu);
1515                 return;
1516         }
1517
1518         if (is_paging(vcpu)
1519             && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1520                 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1521                 inject_gp(vcpu);
1522                 return;
1523         }
1524
1525         kvm_arch_ops->set_efer(vcpu, efer);
1526
1527         efer &= ~EFER_LMA;
1528         efer |= vcpu->shadow_efer & EFER_LMA;
1529
1530         vcpu->shadow_efer = efer;
1531 }
1532
1533 #endif
1534
1535 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1536 {
1537         switch (msr) {
1538 #ifdef CONFIG_X86_64
1539         case MSR_EFER:
1540                 set_efer(vcpu, data);
1541                 break;
1542 #endif
1543         case MSR_IA32_MC0_STATUS:
1544                 pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1545                        __FUNCTION__, data);
1546                 break;
1547         case MSR_IA32_MCG_STATUS:
1548                 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
1549                         __FUNCTION__, data);
1550                 break;
1551         case MSR_IA32_UCODE_REV:
1552         case MSR_IA32_UCODE_WRITE:
1553         case 0x200 ... 0x2ff: /* MTRRs */
1554                 break;
1555         case MSR_IA32_APICBASE:
1556                 vcpu->apic_base = data;
1557                 break;
1558         case MSR_IA32_MISC_ENABLE:
1559                 vcpu->ia32_misc_enable_msr = data;
1560                 break;
1561         /*
1562          * This is the 'probe whether the host is KVM' logic:
1563          */
1564         case MSR_KVM_API_MAGIC:
1565                 return vcpu_register_para(vcpu, data);
1566
1567         default:
1568                 pr_unimpl(vcpu, "unhandled wrmsr: 0x%x\n", msr);
1569                 return 1;
1570         }
1571         return 0;
1572 }
1573 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1574
1575 /*
1576  * Writes msr value into into the appropriate "register".
1577  * Returns 0 on success, non-0 otherwise.
1578  * Assumes vcpu_load() was already called.
1579  */
1580 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1581 {
1582         return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1583 }
1584
1585 void kvm_resched(struct kvm_vcpu *vcpu)
1586 {
1587         if (!need_resched())
1588                 return;
1589         cond_resched();
1590 }
1591 EXPORT_SYMBOL_GPL(kvm_resched);
1592
1593 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
1594 {
1595         int i;
1596         u32 function;
1597         struct kvm_cpuid_entry *e, *best;
1598
1599         kvm_arch_ops->cache_regs(vcpu);
1600         function = vcpu->regs[VCPU_REGS_RAX];
1601         vcpu->regs[VCPU_REGS_RAX] = 0;
1602         vcpu->regs[VCPU_REGS_RBX] = 0;
1603         vcpu->regs[VCPU_REGS_RCX] = 0;
1604         vcpu->regs[VCPU_REGS_RDX] = 0;
1605         best = NULL;
1606         for (i = 0; i < vcpu->cpuid_nent; ++i) {
1607                 e = &vcpu->cpuid_entries[i];
1608                 if (e->function == function) {
1609                         best = e;
1610                         break;
1611                 }
1612                 /*
1613                  * Both basic or both extended?
1614                  */
1615                 if (((e->function ^ function) & 0x80000000) == 0)
1616                         if (!best || e->function > best->function)
1617                                 best = e;
1618         }
1619         if (best) {
1620                 vcpu->regs[VCPU_REGS_RAX] = best->eax;
1621                 vcpu->regs[VCPU_REGS_RBX] = best->ebx;
1622                 vcpu->regs[VCPU_REGS_RCX] = best->ecx;
1623                 vcpu->regs[VCPU_REGS_RDX] = best->edx;
1624         }
1625         kvm_arch_ops->decache_regs(vcpu);
1626         kvm_arch_ops->skip_emulated_instruction(vcpu);
1627 }
1628 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
1629
1630 static int pio_copy_data(struct kvm_vcpu *vcpu)
1631 {
1632         void *p = vcpu->pio_data;
1633         void *q;
1634         unsigned bytes;
1635         int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
1636
1637         q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
1638                  PAGE_KERNEL);
1639         if (!q) {
1640                 free_pio_guest_pages(vcpu);
1641                 return -ENOMEM;
1642         }
1643         q += vcpu->pio.guest_page_offset;
1644         bytes = vcpu->pio.size * vcpu->pio.cur_count;
1645         if (vcpu->pio.in)
1646                 memcpy(q, p, bytes);
1647         else
1648                 memcpy(p, q, bytes);
1649         q -= vcpu->pio.guest_page_offset;
1650         vunmap(q);
1651         free_pio_guest_pages(vcpu);
1652         return 0;
1653 }
1654
1655 static int complete_pio(struct kvm_vcpu *vcpu)
1656 {
1657         struct kvm_pio_request *io = &vcpu->pio;
1658         long delta;
1659         int r;
1660
1661         kvm_arch_ops->cache_regs(vcpu);
1662
1663         if (!io->string) {
1664                 if (io->in)
1665                         memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
1666                                io->size);
1667         } else {
1668                 if (io->in) {
1669                         r = pio_copy_data(vcpu);
1670                         if (r) {
1671                                 kvm_arch_ops->cache_regs(vcpu);
1672                                 return r;
1673                         }
1674                 }
1675
1676                 delta = 1;
1677                 if (io->rep) {
1678                         delta *= io->cur_count;
1679                         /*
1680                          * The size of the register should really depend on
1681                          * current address size.
1682                          */
1683                         vcpu->regs[VCPU_REGS_RCX] -= delta;
1684                 }
1685                 if (io->down)
1686                         delta = -delta;
1687                 delta *= io->size;
1688                 if (io->in)
1689                         vcpu->regs[VCPU_REGS_RDI] += delta;
1690                 else
1691                         vcpu->regs[VCPU_REGS_RSI] += delta;
1692         }
1693
1694         kvm_arch_ops->decache_regs(vcpu);
1695
1696         io->count -= io->cur_count;
1697         io->cur_count = 0;
1698
1699         if (!io->count)
1700                 kvm_arch_ops->skip_emulated_instruction(vcpu);
1701         return 0;
1702 }
1703
1704 static void kernel_pio(struct kvm_io_device *pio_dev,
1705                        struct kvm_vcpu *vcpu,
1706                        void *pd)
1707 {
1708         /* TODO: String I/O for in kernel device */
1709
1710         if (vcpu->pio.in)
1711                 kvm_iodevice_read(pio_dev, vcpu->pio.port,
1712                                   vcpu->pio.size,
1713                                   pd);
1714         else
1715                 kvm_iodevice_write(pio_dev, vcpu->pio.port,
1716                                    vcpu->pio.size,
1717                                    pd);
1718 }
1719
1720 static void pio_string_write(struct kvm_io_device *pio_dev,
1721                              struct kvm_vcpu *vcpu)
1722 {
1723         struct kvm_pio_request *io = &vcpu->pio;
1724         void *pd = vcpu->pio_data;
1725         int i;
1726
1727         for (i = 0; i < io->cur_count; i++) {
1728                 kvm_iodevice_write(pio_dev, io->port,
1729                                    io->size,
1730                                    pd);
1731                 pd += io->size;
1732         }
1733 }
1734
1735 int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1736                   int size, unsigned long count, int string, int down,
1737                   gva_t address, int rep, unsigned port)
1738 {
1739         unsigned now, in_page;
1740         int i, ret = 0;
1741         int nr_pages = 1;
1742         struct page *page;
1743         struct kvm_io_device *pio_dev;
1744
1745         vcpu->run->exit_reason = KVM_EXIT_IO;
1746         vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1747         vcpu->run->io.size = size;
1748         vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1749         vcpu->run->io.count = count;
1750         vcpu->run->io.port = port;
1751         vcpu->pio.count = count;
1752         vcpu->pio.cur_count = count;
1753         vcpu->pio.size = size;
1754         vcpu->pio.in = in;
1755         vcpu->pio.port = port;
1756         vcpu->pio.string = string;
1757         vcpu->pio.down = down;
1758         vcpu->pio.guest_page_offset = offset_in_page(address);
1759         vcpu->pio.rep = rep;
1760
1761         pio_dev = vcpu_find_pio_dev(vcpu, port);
1762         if (!string) {
1763                 kvm_arch_ops->cache_regs(vcpu);
1764                 memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
1765                 kvm_arch_ops->decache_regs(vcpu);
1766                 if (pio_dev) {
1767                         kernel_pio(pio_dev, vcpu, vcpu->pio_data);
1768                         complete_pio(vcpu);
1769                         return 1;
1770                 }
1771                 return 0;
1772         }
1773
1774         if (!count) {
1775                 kvm_arch_ops->skip_emulated_instruction(vcpu);
1776                 return 1;
1777         }
1778
1779         if (!down)
1780                 in_page = PAGE_SIZE - offset_in_page(address);
1781         else
1782                 in_page = offset_in_page(address) + size;
1783         now = min(count, (unsigned long)in_page / size);
1784         if (!now) {
1785                 /*
1786                  * String I/O straddles page boundary.  Pin two guest pages
1787                  * so that we satisfy atomicity constraints.  Do just one
1788                  * transaction to avoid complexity.
1789                  */
1790                 nr_pages = 2;
1791                 now = 1;
1792         }
1793         if (down) {
1794                 /*
1795                  * String I/O in reverse.  Yuck.  Kill the guest, fix later.
1796                  */
1797                 pr_unimpl(vcpu, "guest string pio down\n");
1798                 inject_gp(vcpu);
1799                 return 1;
1800         }
1801         vcpu->run->io.count = now;
1802         vcpu->pio.cur_count = now;
1803
1804         for (i = 0; i < nr_pages; ++i) {
1805                 mutex_lock(&vcpu->kvm->lock);
1806                 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
1807                 if (page)
1808                         get_page(page);
1809                 vcpu->pio.guest_pages[i] = page;
1810                 mutex_unlock(&vcpu->kvm->lock);
1811                 if (!page) {
1812                         inject_gp(vcpu);
1813                         free_pio_guest_pages(vcpu);
1814                         return 1;
1815                 }
1816         }
1817
1818         if (!vcpu->pio.in) {
1819                 /* string PIO write */
1820                 ret = pio_copy_data(vcpu);
1821                 if (ret >= 0 && pio_dev) {
1822                         pio_string_write(pio_dev, vcpu);
1823                         complete_pio(vcpu);
1824                         if (vcpu->pio.count == 0)
1825                                 ret = 1;
1826                 }
1827         } else if (pio_dev)
1828                 pr_unimpl(vcpu, "no string pio read support yet, "
1829                        "port %x size %d count %ld\n",
1830                         port, size, count);
1831
1832         return ret;
1833 }
1834 EXPORT_SYMBOL_GPL(kvm_setup_pio);
1835
1836 static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1837 {
1838         int r;
1839         sigset_t sigsaved;
1840
1841         vcpu_load(vcpu);
1842
1843         if (vcpu->sigset_active)
1844                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
1845
1846         /* re-sync apic's tpr */
1847         vcpu->cr8 = kvm_run->cr8;
1848
1849         if (vcpu->pio.cur_count) {
1850                 r = complete_pio(vcpu);
1851                 if (r)
1852                         goto out;
1853         }
1854
1855         if (vcpu->mmio_needed) {
1856                 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1857                 vcpu->mmio_read_completed = 1;
1858                 vcpu->mmio_needed = 0;
1859                 r = emulate_instruction(vcpu, kvm_run,
1860                                         vcpu->mmio_fault_cr2, 0);
1861                 if (r == EMULATE_DO_MMIO) {
1862                         /*
1863                          * Read-modify-write.  Back to userspace.
1864                          */
1865                         r = 0;
1866                         goto out;
1867                 }
1868         }
1869
1870         if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
1871                 kvm_arch_ops->cache_regs(vcpu);
1872                 vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
1873                 kvm_arch_ops->decache_regs(vcpu);
1874         }
1875
1876         r = kvm_arch_ops->run(vcpu, kvm_run);
1877
1878 out:
1879         if (vcpu->sigset_active)
1880                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1881
1882         vcpu_put(vcpu);
1883         return r;
1884 }
1885
1886 static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
1887                                    struct kvm_regs *regs)
1888 {
1889         vcpu_load(vcpu);
1890
1891         kvm_arch_ops->cache_regs(vcpu);
1892
1893         regs->rax = vcpu->regs[VCPU_REGS_RAX];
1894         regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1895         regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1896         regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1897         regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1898         regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1899         regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1900         regs->rbp = vcpu->regs[VCPU_REGS_RBP];
1901 #ifdef CONFIG_X86_64
1902         regs->r8 = vcpu->regs[VCPU_REGS_R8];
1903         regs->r9 = vcpu->regs[VCPU_REGS_R9];
1904         regs->r10 = vcpu->regs[VCPU_REGS_R10];
1905         regs->r11 = vcpu->regs[VCPU_REGS_R11];
1906         regs->r12 = vcpu->regs[VCPU_REGS_R12];
1907         regs->r13 = vcpu->regs[VCPU_REGS_R13];
1908         regs->r14 = vcpu->regs[VCPU_REGS_R14];
1909         regs->r15 = vcpu->regs[VCPU_REGS_R15];
1910 #endif
1911
1912         regs->rip = vcpu->rip;
1913         regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1914
1915         /*
1916          * Don't leak debug flags in case they were set for guest debugging
1917          */
1918         if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1919                 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1920
1921         vcpu_put(vcpu);
1922
1923         return 0;
1924 }
1925
1926 static int kvm_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
1927                                    struct kvm_regs *regs)
1928 {
1929         vcpu_load(vcpu);
1930
1931         vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1932         vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1933         vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1934         vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1935         vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1936         vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1937         vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1938         vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
1939 #ifdef CONFIG_X86_64
1940         vcpu->regs[VCPU_REGS_R8] = regs->r8;
1941         vcpu->regs[VCPU_REGS_R9] = regs->r9;
1942         vcpu->regs[VCPU_REGS_R10] = regs->r10;
1943         vcpu->regs[VCPU_REGS_R11] = regs->r11;
1944         vcpu->regs[VCPU_REGS_R12] = regs->r12;
1945         vcpu->regs[VCPU_REGS_R13] = regs->r13;
1946         vcpu->regs[VCPU_REGS_R14] = regs->r14;
1947         vcpu->regs[VCPU_REGS_R15] = regs->r15;
1948 #endif
1949
1950         vcpu->rip = regs->rip;
1951         kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1952
1953         kvm_arch_ops->decache_regs(vcpu);
1954
1955         vcpu_put(vcpu);
1956
1957         return 0;
1958 }
1959
1960 static void get_segment(struct kvm_vcpu *vcpu,
1961                         struct kvm_segment *var, int seg)
1962 {
1963         return kvm_arch_ops->get_segment(vcpu, var, seg);
1964 }
1965
1966 static int kvm_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
1967                                     struct kvm_sregs *sregs)
1968 {
1969         struct descriptor_table dt;
1970
1971         vcpu_load(vcpu);
1972
1973         get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1974         get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1975         get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1976         get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1977         get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1978         get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1979
1980         get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1981         get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1982
1983         kvm_arch_ops->get_idt(vcpu, &dt);
1984         sregs->idt.limit = dt.limit;
1985         sregs->idt.base = dt.base;
1986         kvm_arch_ops->get_gdt(vcpu, &dt);
1987         sregs->gdt.limit = dt.limit;
1988         sregs->gdt.base = dt.base;
1989
1990         kvm_arch_ops->decache_cr4_guest_bits(vcpu);
1991         sregs->cr0 = vcpu->cr0;
1992         sregs->cr2 = vcpu->cr2;
1993         sregs->cr3 = vcpu->cr3;
1994         sregs->cr4 = vcpu->cr4;
1995         sregs->cr8 = vcpu->cr8;
1996         sregs->efer = vcpu->shadow_efer;
1997         sregs->apic_base = vcpu->apic_base;
1998
1999         memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
2000                sizeof sregs->interrupt_bitmap);
2001
2002         vcpu_put(vcpu);
2003
2004         return 0;
2005 }
2006
2007 static void set_segment(struct kvm_vcpu *vcpu,
2008                         struct kvm_segment *var, int seg)
2009 {
2010         return kvm_arch_ops->set_segment(vcpu, var, seg);
2011 }
2012
2013 static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2014                                     struct kvm_sregs *sregs)
2015 {
2016         int mmu_reset_needed = 0;
2017         int i;
2018         struct descriptor_table dt;
2019
2020         vcpu_load(vcpu);
2021
2022         dt.limit = sregs->idt.limit;
2023         dt.base = sregs->idt.base;
2024         kvm_arch_ops->set_idt(vcpu, &dt);
2025         dt.limit = sregs->gdt.limit;
2026         dt.base = sregs->gdt.base;
2027         kvm_arch_ops->set_gdt(vcpu, &dt);
2028
2029         vcpu->cr2 = sregs->cr2;
2030         mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
2031         vcpu->cr3 = sregs->cr3;
2032
2033         vcpu->cr8 = sregs->cr8;
2034
2035         mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
2036 #ifdef CONFIG_X86_64
2037         kvm_arch_ops->set_efer(vcpu, sregs->efer);
2038 #endif
2039         vcpu->apic_base = sregs->apic_base;
2040
2041         kvm_arch_ops->decache_cr4_guest_bits(vcpu);
2042
2043         mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
2044         kvm_arch_ops->set_cr0(vcpu, sregs->cr0);
2045
2046         mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
2047         kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
2048         if (!is_long_mode(vcpu) && is_pae(vcpu))
2049                 load_pdptrs(vcpu, vcpu->cr3);
2050
2051         if (mmu_reset_needed)
2052                 kvm_mmu_reset_context(vcpu);
2053
2054         memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
2055                sizeof vcpu->irq_pending);
2056         vcpu->irq_summary = 0;
2057         for (i = 0; i < ARRAY_SIZE(vcpu->irq_pending); ++i)
2058                 if (vcpu->irq_pending[i])
2059                         __set_bit(i, &vcpu->irq_summary);
2060
2061         set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2062         set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2063         set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2064         set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2065         set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2066         set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2067
2068         set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2069         set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2070
2071         vcpu_put(vcpu);
2072
2073         return 0;
2074 }
2075
2076 /*
2077  * List of msr numbers which we expose to userspace through KVM_GET_MSRS
2078  * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
2079  *
2080  * This list is modified at module load time to reflect the
2081  * capabilities of the host cpu.
2082  */
2083 static u32 msrs_to_save[] = {
2084         MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
2085         MSR_K6_STAR,
2086 #ifdef CONFIG_X86_64
2087         MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
2088 #endif
2089         MSR_IA32_TIME_STAMP_COUNTER,
2090 };
2091
2092 static unsigned num_msrs_to_save;
2093
2094 static u32 emulated_msrs[] = {
2095         MSR_IA32_MISC_ENABLE,
2096 };
2097
2098 static __init void kvm_init_msr_list(void)
2099 {
2100         u32 dummy[2];
2101         unsigned i, j;
2102
2103         for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
2104                 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
2105                         continue;
2106                 if (j < i)
2107                         msrs_to_save[j] = msrs_to_save[i];
2108                 j++;
2109         }
2110         num_msrs_to_save = j;
2111 }
2112
2113 /*
2114  * Adapt set_msr() to msr_io()'s calling convention
2115  */
2116 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
2117 {
2118         return kvm_set_msr(vcpu, index, *data);
2119 }
2120
2121 /*
2122  * Read or write a bunch of msrs. All parameters are kernel addresses.
2123  *
2124  * @return number of msrs set successfully.
2125  */
2126 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
2127                     struct kvm_msr_entry *entries,
2128                     int (*do_msr)(struct kvm_vcpu *vcpu,
2129                                   unsigned index, u64 *data))
2130 {
2131         int i;
2132
2133         vcpu_load(vcpu);
2134
2135         for (i = 0; i < msrs->nmsrs; ++i)
2136                 if (do_msr(vcpu, entries[i].index, &entries[i].data))
2137                         break;
2138
2139         vcpu_put(vcpu);
2140
2141         return i;
2142 }
2143
2144 /*
2145  * Read or write a bunch of msrs. Parameters are user addresses.
2146  *
2147  * @return number of msrs set successfully.
2148  */
2149 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
2150                   int (*do_msr)(struct kvm_vcpu *vcpu,
2151                                 unsigned index, u64 *data),
2152                   int writeback)
2153 {
2154         struct kvm_msrs msrs;
2155         struct kvm_msr_entry *entries;
2156         int r, n;
2157         unsigned size;
2158
2159         r = -EFAULT;
2160         if (copy_from_user(&msrs, user_msrs, sizeof msrs))
2161                 goto out;
2162
2163         r = -E2BIG;
2164         if (msrs.nmsrs >= MAX_IO_MSRS)
2165                 goto out;
2166
2167         r = -ENOMEM;
2168         size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
2169         entries = vmalloc(size);
2170         if (!entries)
2171                 goto out;
2172
2173         r = -EFAULT;
2174         if (copy_from_user(entries, user_msrs->entries, size))
2175                 goto out_free;
2176
2177         r = n = __msr_io(vcpu, &msrs, entries, do_msr);
2178         if (r < 0)
2179                 goto out_free;
2180
2181         r = -EFAULT;
2182         if (writeback && copy_to_user(user_msrs->entries, entries, size))
2183                 goto out_free;
2184
2185         r = n;
2186
2187 out_free:
2188         vfree(entries);
2189 out:
2190         return r;
2191 }
2192
2193 /*
2194  * Translate a guest virtual address to a guest physical address.
2195  */
2196 static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2197                                     struct kvm_translation *tr)
2198 {
2199         unsigned long vaddr = tr->linear_address;
2200         gpa_t gpa;
2201
2202         vcpu_load(vcpu);
2203         mutex_lock(&vcpu->kvm->lock);
2204         gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
2205         tr->physical_address = gpa;
2206         tr->valid = gpa != UNMAPPED_GVA;
2207         tr->writeable = 1;
2208         tr->usermode = 0;
2209         mutex_unlock(&vcpu->kvm->lock);
2210         vcpu_put(vcpu);
2211
2212         return 0;
2213 }
2214
2215 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2216                                     struct kvm_interrupt *irq)
2217 {
2218         if (irq->irq < 0 || irq->irq >= 256)
2219                 return -EINVAL;
2220         vcpu_load(vcpu);
2221
2222         set_bit(irq->irq, vcpu->irq_pending);
2223         set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
2224
2225         vcpu_put(vcpu);
2226
2227         return 0;
2228 }
2229
2230 static int kvm_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
2231                                       struct kvm_debug_guest *dbg)
2232 {
2233         int r;
2234
2235         vcpu_load(vcpu);
2236
2237         r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
2238
2239         vcpu_put(vcpu);
2240
2241         return r;
2242 }
2243
2244 static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
2245                                     unsigned long address,
2246                                     int *type)
2247 {
2248         struct kvm_vcpu *vcpu = vma->vm_file->private_data;
2249         unsigned long pgoff;
2250         struct page *page;
2251
2252         pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
2253         if (pgoff == 0)
2254                 page = virt_to_page(vcpu->run);
2255         else if (pgoff == KVM_PIO_PAGE_OFFSET)
2256                 page = virt_to_page(vcpu->pio_data);
2257         else
2258                 return NOPAGE_SIGBUS;
2259         get_page(page);
2260         if (type != NULL)
2261                 *type = VM_FAULT_MINOR;
2262
2263         return page;
2264 }
2265
2266 static struct vm_operations_struct kvm_vcpu_vm_ops = {
2267         .nopage = kvm_vcpu_nopage,
2268 };
2269
2270 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2271 {
2272         vma->vm_ops = &kvm_vcpu_vm_ops;
2273         return 0;
2274 }
2275
2276 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2277 {
2278         struct kvm_vcpu *vcpu = filp->private_data;
2279
2280         fput(vcpu->kvm->filp);
2281         return 0;
2282 }
2283
2284 static struct file_operations kvm_vcpu_fops = {
2285         .release        = kvm_vcpu_release,
2286         .unlocked_ioctl = kvm_vcpu_ioctl,
2287         .compat_ioctl   = kvm_vcpu_ioctl,
2288         .mmap           = kvm_vcpu_mmap,
2289 };
2290
2291 /*
2292  * Allocates an inode for the vcpu.
2293  */
2294 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2295 {
2296         int fd, r;
2297         struct inode *inode;
2298         struct file *file;
2299
2300         r = anon_inode_getfd(&fd, &inode, &file,
2301                              "kvm-vcpu", &kvm_vcpu_fops, vcpu);
2302         if (r)
2303                 return r;
2304         atomic_inc(&vcpu->kvm->filp->f_count);
2305         return fd;
2306 }
2307
2308 /*
2309  * Creates some virtual cpus.  Good luck creating more than one.
2310  */
2311 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
2312 {
2313         int r;
2314         struct kvm_vcpu *vcpu;
2315
2316         if (!valid_vcpu(n))
2317                 return -EINVAL;
2318
2319         vcpu = kvm_arch_ops->vcpu_create(kvm, n);
2320         if (IS_ERR(vcpu))
2321                 return PTR_ERR(vcpu);
2322
2323         preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
2324
2325         /* We do fxsave: this must be aligned. */
2326         BUG_ON((unsigned long)&vcpu->host_fx_image & 0xF);
2327
2328         vcpu_load(vcpu);
2329         r = kvm_mmu_setup(vcpu);
2330         vcpu_put(vcpu);
2331         if (r < 0)
2332                 goto free_vcpu;
2333
2334         mutex_lock(&kvm->lock);
2335         if (kvm->vcpus[n]) {
2336                 r = -EEXIST;
2337                 mutex_unlock(&kvm->lock);
2338                 goto mmu_unload;
2339         }
2340         kvm->vcpus[n] = vcpu;
2341         mutex_unlock(&kvm->lock);
2342
2343         /* Now it's all set up, let userspace reach it */
2344         r = create_vcpu_fd(vcpu);
2345         if (r < 0)
2346                 goto unlink;
2347         return r;
2348
2349 unlink:
2350         mutex_lock(&kvm->lock);
2351         kvm->vcpus[n] = NULL;
2352         mutex_unlock(&kvm->lock);
2353
2354 mmu_unload:
2355         vcpu_load(vcpu);
2356         kvm_mmu_unload(vcpu);
2357         vcpu_put(vcpu);
2358
2359 free_vcpu:
2360         kvm_arch_ops->vcpu_free(vcpu);
2361         return r;
2362 }
2363
2364 static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
2365 {
2366         u64 efer;
2367         int i;
2368         struct kvm_cpuid_entry *e, *entry;
2369
2370         rdmsrl(MSR_EFER, efer);
2371         entry = NULL;
2372         for (i = 0; i < vcpu->cpuid_nent; ++i) {
2373                 e = &vcpu->cpuid_entries[i];
2374                 if (e->function == 0x80000001) {
2375                         entry = e;
2376                         break;
2377                 }
2378         }
2379         if (entry && (entry->edx & (1 << 20)) && !(efer & EFER_NX)) {
2380                 entry->edx &= ~(1 << 20);
2381                 printk(KERN_INFO "kvm: guest NX capability removed\n");
2382         }
2383 }
2384
2385 static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
2386                                     struct kvm_cpuid *cpuid,
2387                                     struct kvm_cpuid_entry __user *entries)
2388 {
2389         int r;
2390
2391         r = -E2BIG;
2392         if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2393                 goto out;
2394         r = -EFAULT;
2395         if (copy_from_user(&vcpu->cpuid_entries, entries,
2396                            cpuid->nent * sizeof(struct kvm_cpuid_entry)))
2397                 goto out;
2398         vcpu->cpuid_nent = cpuid->nent;
2399         cpuid_fix_nx_cap(vcpu);
2400         return 0;
2401
2402 out:
2403         return r;
2404 }
2405
2406 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2407 {
2408         if (sigset) {
2409                 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2410                 vcpu->sigset_active = 1;
2411                 vcpu->sigset = *sigset;
2412         } else
2413                 vcpu->sigset_active = 0;
2414         return 0;
2415 }
2416
2417 /*
2418  * fxsave fpu state.  Taken from x86_64/processor.h.  To be killed when
2419  * we have asm/x86/processor.h
2420  */
2421 struct fxsave {
2422         u16     cwd;
2423         u16     swd;
2424         u16     twd;
2425         u16     fop;
2426         u64     rip;
2427         u64     rdp;
2428         u32     mxcsr;
2429         u32     mxcsr_mask;
2430         u32     st_space[32];   /* 8*16 bytes for each FP-reg = 128 bytes */
2431 #ifdef CONFIG_X86_64
2432         u32     xmm_space[64];  /* 16*16 bytes for each XMM-reg = 256 bytes */
2433 #else
2434         u32     xmm_space[32];  /* 8*16 bytes for each XMM-reg = 128 bytes */
2435 #endif
2436 };
2437
2438 static int kvm_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2439 {
2440         struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
2441
2442         vcpu_load(vcpu);
2443
2444         memcpy(fpu->fpr, fxsave->st_space, 128);
2445         fpu->fcw = fxsave->cwd;
2446         fpu->fsw = fxsave->swd;
2447         fpu->ftwx = fxsave->twd;
2448         fpu->last_opcode = fxsave->fop;
2449         fpu->last_ip = fxsave->rip;
2450         fpu->last_dp = fxsave->rdp;
2451         memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
2452
2453         vcpu_put(vcpu);
2454
2455         return 0;
2456 }
2457
2458 static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2459 {
2460         struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
2461
2462         vcpu_load(vcpu);
2463
2464         memcpy(fxsave->st_space, fpu->fpr, 128);
2465         fxsave->cwd = fpu->fcw;
2466         fxsave->swd = fpu->fsw;
2467         fxsave->twd = fpu->ftwx;
2468         fxsave->fop = fpu->last_opcode;
2469         fxsave->rip = fpu->last_ip;
2470         fxsave->rdp = fpu->last_dp;
2471         memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
2472
2473         vcpu_put(vcpu);
2474
2475         return 0;
2476 }
2477
2478 static long kvm_vcpu_ioctl(struct file *filp,
2479                            unsigned int ioctl, unsigned long arg)
2480 {
2481         struct kvm_vcpu *vcpu = filp->private_data;
2482         void __user *argp = (void __user *)arg;
2483         int r = -EINVAL;
2484
2485         switch (ioctl) {
2486         case KVM_RUN:
2487                 r = -EINVAL;
2488                 if (arg)
2489                         goto out;
2490                 r = kvm_vcpu_ioctl_run(vcpu, vcpu->run);
2491                 break;
2492         case KVM_GET_REGS: {
2493                 struct kvm_regs kvm_regs;
2494
2495                 memset(&kvm_regs, 0, sizeof kvm_regs);
2496                 r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
2497                 if (r)
2498                         goto out;
2499                 r = -EFAULT;
2500                 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
2501                         goto out;
2502                 r = 0;
2503                 break;
2504         }
2505         case KVM_SET_REGS: {
2506                 struct kvm_regs kvm_regs;
2507
2508                 r = -EFAULT;
2509                 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
2510                         goto out;
2511                 r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
2512                 if (r)
2513                         goto out;
2514                 r = 0;
2515                 break;
2516         }
2517         case KVM_GET_SREGS: {
2518                 struct kvm_sregs kvm_sregs;
2519
2520                 memset(&kvm_sregs, 0, sizeof kvm_sregs);
2521                 r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
2522                 if (r)
2523                         goto out;
2524                 r = -EFAULT;
2525                 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
2526                         goto out;
2527                 r = 0;
2528                 break;
2529         }
2530         case KVM_SET_SREGS: {
2531                 struct kvm_sregs kvm_sregs;
2532
2533                 r = -EFAULT;
2534                 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
2535                         goto out;
2536                 r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
2537                 if (r)
2538                         goto out;
2539                 r = 0;
2540                 break;
2541         }
2542         case KVM_TRANSLATE: {
2543                 struct kvm_translation tr;
2544
2545                 r = -EFAULT;
2546                 if (copy_from_user(&tr, argp, sizeof tr))
2547                         goto out;
2548                 r = kvm_vcpu_ioctl_translate(vcpu, &tr);
2549                 if (r)
2550                         goto out;
2551                 r = -EFAULT;
2552                 if (copy_to_user(argp, &tr, sizeof tr))
2553                         goto out;
2554                 r = 0;
2555                 break;
2556         }
2557         case KVM_INTERRUPT: {
2558                 struct kvm_interrupt irq;
2559
2560                 r = -EFAULT;
2561                 if (copy_from_user(&irq, argp, sizeof irq))
2562                         goto out;
2563                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
2564                 if (r)
2565                         goto out;
2566                 r = 0;
2567                 break;
2568         }
2569         case KVM_DEBUG_GUEST: {
2570                 struct kvm_debug_guest dbg;
2571
2572                 r = -EFAULT;
2573                 if (copy_from_user(&dbg, argp, sizeof dbg))
2574                         goto out;
2575                 r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg);
2576                 if (r)
2577                         goto out;
2578                 r = 0;
2579                 break;
2580         }
2581         case KVM_GET_MSRS:
2582                 r = msr_io(vcpu, argp, kvm_get_msr, 1);
2583                 break;
2584         case KVM_SET_MSRS:
2585                 r = msr_io(vcpu, argp, do_set_msr, 0);
2586                 break;
2587         case KVM_SET_CPUID: {
2588                 struct kvm_cpuid __user *cpuid_arg = argp;
2589                 struct kvm_cpuid cpuid;
2590
2591                 r = -EFAULT;
2592                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2593                         goto out;
2594                 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
2595                 if (r)
2596                         goto out;
2597                 break;
2598         }
2599         case KVM_SET_SIGNAL_MASK: {
2600                 struct kvm_signal_mask __user *sigmask_arg = argp;
2601                 struct kvm_signal_mask kvm_sigmask;
2602                 sigset_t sigset, *p;
2603
2604                 p = NULL;
2605                 if (argp) {
2606                         r = -EFAULT;
2607                         if (copy_from_user(&kvm_sigmask, argp,
2608                                            sizeof kvm_sigmask))
2609                                 goto out;
2610                         r = -EINVAL;
2611                         if (kvm_sigmask.len != sizeof sigset)
2612                                 goto out;
2613                         r = -EFAULT;
2614                         if (copy_from_user(&sigset, sigmask_arg->sigset,
2615                                            sizeof sigset))
2616                                 goto out;
2617                         p = &sigset;
2618                 }
2619                 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2620                 break;
2621         }
2622         case KVM_GET_FPU: {
2623                 struct kvm_fpu fpu;
2624
2625                 memset(&fpu, 0, sizeof fpu);
2626                 r = kvm_vcpu_ioctl_get_fpu(vcpu, &fpu);
2627                 if (r)
2628                         goto out;
2629                 r = -EFAULT;
2630                 if (copy_to_user(argp, &fpu, sizeof fpu))
2631                         goto out;
2632                 r = 0;
2633                 break;
2634         }
2635         case KVM_SET_FPU: {
2636                 struct kvm_fpu fpu;
2637
2638                 r = -EFAULT;
2639                 if (copy_from_user(&fpu, argp, sizeof fpu))
2640                         goto out;
2641                 r = kvm_vcpu_ioctl_set_fpu(vcpu, &fpu);
2642                 if (r)
2643                         goto out;
2644                 r = 0;
2645                 break;
2646         }
2647         default:
2648                 ;
2649         }
2650 out:
2651         return r;
2652 }
2653
2654 static long kvm_vm_ioctl(struct file *filp,
2655                            unsigned int ioctl, unsigned long arg)
2656 {
2657         struct kvm *kvm = filp->private_data;
2658         void __user *argp = (void __user *)arg;
2659         int r = -EINVAL;
2660
2661         switch (ioctl) {
2662         case KVM_CREATE_VCPU:
2663                 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2664                 if (r < 0)
2665                         goto out;
2666                 break;
2667         case KVM_SET_MEMORY_REGION: {
2668                 struct kvm_memory_region kvm_mem;
2669
2670                 r = -EFAULT;
2671                 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
2672                         goto out;
2673                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_mem);
2674                 if (r)
2675                         goto out;
2676                 break;
2677         }
2678         case KVM_GET_DIRTY_LOG: {
2679                 struct kvm_dirty_log log;
2680
2681                 r = -EFAULT;
2682                 if (copy_from_user(&log, argp, sizeof log))
2683                         goto out;
2684                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2685                 if (r)
2686                         goto out;
2687                 break;
2688         }
2689         case KVM_SET_MEMORY_ALIAS: {
2690                 struct kvm_memory_alias alias;
2691
2692                 r = -EFAULT;
2693                 if (copy_from_user(&alias, argp, sizeof alias))
2694                         goto out;
2695                 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
2696                 if (r)
2697                         goto out;
2698                 break;
2699         }
2700         default:
2701                 ;
2702         }
2703 out:
2704         return r;
2705 }
2706
2707 static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
2708                                   unsigned long address,
2709                                   int *type)
2710 {
2711         struct kvm *kvm = vma->vm_file->private_data;
2712         unsigned long pgoff;
2713         struct page *page;
2714
2715         pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
2716         page = gfn_to_page(kvm, pgoff);
2717         if (!page)
2718                 return NOPAGE_SIGBUS;
2719         get_page(page);
2720         if (type != NULL)
2721                 *type = VM_FAULT_MINOR;
2722
2723         return page;
2724 }
2725
2726 static struct vm_operations_struct kvm_vm_vm_ops = {
2727         .nopage = kvm_vm_nopage,
2728 };
2729
2730 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2731 {
2732         vma->vm_ops = &kvm_vm_vm_ops;
2733         return 0;
2734 }
2735
2736 static struct file_operations kvm_vm_fops = {
2737         .release        = kvm_vm_release,
2738         .unlocked_ioctl = kvm_vm_ioctl,
2739         .compat_ioctl   = kvm_vm_ioctl,
2740         .mmap           = kvm_vm_mmap,
2741 };
2742
2743 static int kvm_dev_ioctl_create_vm(void)
2744 {
2745         int fd, r;
2746         struct inode *inode;
2747         struct file *file;
2748         struct kvm *kvm;
2749
2750         kvm = kvm_create_vm();
2751         if (IS_ERR(kvm))
2752                 return PTR_ERR(kvm);
2753         r = anon_inode_getfd(&fd, &inode, &file, "kvm-vm", &kvm_vm_fops, kvm);
2754         if (r) {
2755                 kvm_destroy_vm(kvm);
2756                 return r;
2757         }
2758
2759         kvm->filp = file;
2760
2761         return fd;
2762 }
2763
2764 static long kvm_dev_ioctl(struct file *filp,
2765                           unsigned int ioctl, unsigned long arg)
2766 {
2767         void __user *argp = (void __user *)arg;
2768         long r = -EINVAL;
2769
2770         switch (ioctl) {
2771         case KVM_GET_API_VERSION:
2772                 r = -EINVAL;
2773                 if (arg)
2774                         goto out;
2775                 r = KVM_API_VERSION;
2776                 break;
2777         case KVM_CREATE_VM:
2778                 r = -EINVAL;
2779                 if (arg)
2780                         goto out;
2781                 r = kvm_dev_ioctl_create_vm();
2782                 break;
2783         case KVM_GET_MSR_INDEX_LIST: {
2784                 struct kvm_msr_list __user *user_msr_list = argp;
2785                 struct kvm_msr_list msr_list;
2786                 unsigned n;
2787
2788                 r = -EFAULT;
2789                 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2790                         goto out;
2791                 n = msr_list.nmsrs;
2792                 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
2793                 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2794                         goto out;
2795                 r = -E2BIG;
2796                 if (n < num_msrs_to_save)
2797                         goto out;
2798                 r = -EFAULT;
2799                 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
2800                                  num_msrs_to_save * sizeof(u32)))
2801                         goto out;
2802                 if (copy_to_user(user_msr_list->indices
2803                                  + num_msrs_to_save * sizeof(u32),
2804                                  &emulated_msrs,
2805                                  ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
2806                         goto out;
2807                 r = 0;
2808                 break;
2809         }
2810         case KVM_CHECK_EXTENSION:
2811                 /*
2812                  * No extensions defined at present.
2813                  */
2814                 r = 0;
2815                 break;
2816         case KVM_GET_VCPU_MMAP_SIZE:
2817                 r = -EINVAL;
2818                 if (arg)
2819                         goto out;
2820                 r = 2 * PAGE_SIZE;
2821                 break;
2822         default:
2823                 ;
2824         }
2825 out:
2826         return r;
2827 }
2828
2829 static struct file_operations kvm_chardev_ops = {
2830         .unlocked_ioctl = kvm_dev_ioctl,
2831         .compat_ioctl   = kvm_dev_ioctl,
2832 };
2833
2834 static struct miscdevice kvm_dev = {
2835         KVM_MINOR,
2836         "kvm",
2837         &kvm_chardev_ops,
2838 };
2839
2840 /*
2841  * Make sure that a cpu that is being hot-unplugged does not have any vcpus
2842  * cached on it.
2843  */
2844 static void decache_vcpus_on_cpu(int cpu)
2845 {
2846         struct kvm *vm;
2847         struct kvm_vcpu *vcpu;
2848         int i;
2849
2850         spin_lock(&kvm_lock);
2851         list_for_each_entry(vm, &vm_list, vm_list)
2852                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2853                         vcpu = vm->vcpus[i];
2854                         if (!vcpu)
2855                                 continue;
2856                         /*
2857                          * If the vcpu is locked, then it is running on some
2858                          * other cpu and therefore it is not cached on the
2859                          * cpu in question.
2860                          *
2861                          * If it's not locked, check the last cpu it executed
2862                          * on.
2863                          */
2864                         if (mutex_trylock(&vcpu->mutex)) {
2865                                 if (vcpu->cpu == cpu) {
2866                                         kvm_arch_ops->vcpu_decache(vcpu);
2867                                         vcpu->cpu = -1;
2868                                 }
2869                                 mutex_unlock(&vcpu->mutex);
2870                         }
2871                 }
2872         spin_unlock(&kvm_lock);
2873 }
2874
2875 static void hardware_enable(void *junk)
2876 {
2877         int cpu = raw_smp_processor_id();
2878
2879         if (cpu_isset(cpu, cpus_hardware_enabled))
2880                 return;
2881         cpu_set(cpu, cpus_hardware_enabled);
2882         kvm_arch_ops->hardware_enable(NULL);
2883 }
2884
2885 static void hardware_disable(void *junk)
2886 {
2887         int cpu = raw_smp_processor_id();
2888
2889         if (!cpu_isset(cpu, cpus_hardware_enabled))
2890                 return;
2891         cpu_clear(cpu, cpus_hardware_enabled);
2892         decache_vcpus_on_cpu(cpu);
2893         kvm_arch_ops->hardware_disable(NULL);
2894 }
2895
2896 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2897                            void *v)
2898 {
2899         int cpu = (long)v;
2900
2901         switch (val) {
2902         case CPU_DYING:
2903         case CPU_DYING_FROZEN:
2904                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2905                        cpu);
2906                 hardware_disable(NULL);
2907                 break;
2908         case CPU_UP_CANCELED:
2909         case CPU_UP_CANCELED_FROZEN:
2910                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2911                        cpu);
2912                 smp_call_function_single(cpu, hardware_disable, NULL, 0, 1);
2913                 break;
2914         case CPU_ONLINE:
2915         case CPU_ONLINE_FROZEN:
2916                 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2917                        cpu);
2918                 smp_call_function_single(cpu, hardware_enable, NULL, 0, 1);
2919                 break;
2920         }
2921         return NOTIFY_OK;
2922 }
2923
2924 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2925                        void *v)
2926 {
2927         if (val == SYS_RESTART) {
2928                 /*
2929                  * Some (well, at least mine) BIOSes hang on reboot if
2930                  * in vmx root mode.
2931                  */
2932                 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2933                 on_each_cpu(hardware_disable, NULL, 0, 1);
2934         }
2935         return NOTIFY_OK;
2936 }
2937
2938 static struct notifier_block kvm_reboot_notifier = {
2939         .notifier_call = kvm_reboot,
2940         .priority = 0,
2941 };
2942
2943 void kvm_io_bus_init(struct kvm_io_bus *bus)
2944 {
2945         memset(bus, 0, sizeof(*bus));
2946 }
2947
2948 void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2949 {
2950         int i;
2951
2952         for (i = 0; i < bus->dev_count; i++) {
2953                 struct kvm_io_device *pos = bus->devs[i];
2954
2955                 kvm_iodevice_destructor(pos);
2956         }
2957 }
2958
2959 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr)
2960 {
2961         int i;
2962
2963         for (i = 0; i < bus->dev_count; i++) {
2964                 struct kvm_io_device *pos = bus->devs[i];
2965
2966                 if (pos->in_range(pos, addr))
2967                         return pos;
2968         }
2969
2970         return NULL;
2971 }
2972
2973 void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
2974 {
2975         BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
2976
2977         bus->devs[bus->dev_count++] = dev;
2978 }
2979
2980 static struct notifier_block kvm_cpu_notifier = {
2981         .notifier_call = kvm_cpu_hotplug,
2982         .priority = 20, /* must be > scheduler priority */
2983 };
2984
2985 static u64 stat_get(void *_offset)
2986 {
2987         unsigned offset = (long)_offset;
2988         u64 total = 0;
2989         struct kvm *kvm;
2990         struct kvm_vcpu *vcpu;
2991         int i;
2992
2993         spin_lock(&kvm_lock);
2994         list_for_each_entry(kvm, &vm_list, vm_list)
2995                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2996                         vcpu = kvm->vcpus[i];
2997                         if (vcpu)
2998                                 total += *(u32 *)((void *)vcpu + offset);
2999                 }
3000         spin_unlock(&kvm_lock);
3001         return total;
3002 }
3003
3004 DEFINE_SIMPLE_ATTRIBUTE(stat_fops, stat_get, NULL, "%llu\n");
3005
3006 static __init void kvm_init_debug(void)
3007 {
3008         struct kvm_stats_debugfs_item *p;
3009
3010         debugfs_dir = debugfs_create_dir("kvm", NULL);
3011         for (p = debugfs_entries; p->name; ++p)
3012                 p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir,
3013                                                 (void *)(long)p->offset,
3014                                                 &stat_fops);
3015 }
3016
3017 static void kvm_exit_debug(void)
3018 {
3019         struct kvm_stats_debugfs_item *p;
3020
3021         for (p = debugfs_entries; p->name; ++p)
3022                 debugfs_remove(p->dentry);
3023         debugfs_remove(debugfs_dir);
3024 }
3025
3026 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
3027 {
3028         hardware_disable(NULL);
3029         return 0;
3030 }
3031
3032 static int kvm_resume(struct sys_device *dev)
3033 {
3034         hardware_enable(NULL);
3035         return 0;
3036 }
3037
3038 static struct sysdev_class kvm_sysdev_class = {
3039         set_kset_name("kvm"),
3040         .suspend = kvm_suspend,
3041         .resume = kvm_resume,
3042 };
3043
3044 static struct sys_device kvm_sysdev = {
3045         .id = 0,
3046         .cls = &kvm_sysdev_class,
3047 };
3048
3049 hpa_t bad_page_address;
3050
3051 static inline
3052 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
3053 {
3054         return container_of(pn, struct kvm_vcpu, preempt_notifier);
3055 }
3056
3057 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
3058 {
3059         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3060
3061         kvm_arch_ops->vcpu_load(vcpu, cpu);
3062 }
3063
3064 static void kvm_sched_out(struct preempt_notifier *pn,
3065                           struct task_struct *next)
3066 {
3067         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3068
3069         kvm_arch_ops->vcpu_put(vcpu);
3070 }
3071
3072 int kvm_init_arch(struct kvm_arch_ops *ops, unsigned int vcpu_size,
3073                   struct module *module)
3074 {
3075         int r;
3076         int cpu;
3077
3078         if (kvm_arch_ops) {
3079                 printk(KERN_ERR "kvm: already loaded the other module\n");
3080                 return -EEXIST;
3081         }
3082
3083         if (!ops->cpu_has_kvm_support()) {
3084                 printk(KERN_ERR "kvm: no hardware support\n");
3085                 return -EOPNOTSUPP;
3086         }
3087         if (ops->disabled_by_bios()) {
3088                 printk(KERN_ERR "kvm: disabled by bios\n");
3089                 return -EOPNOTSUPP;
3090         }
3091
3092         kvm_arch_ops = ops;
3093
3094         r = kvm_arch_ops->hardware_setup();
3095         if (r < 0)
3096                 goto out;
3097
3098         for_each_online_cpu(cpu) {
3099                 smp_call_function_single(cpu,
3100                                 kvm_arch_ops->check_processor_compatibility,
3101                                 &r, 0, 1);
3102                 if (r < 0)
3103                         goto out_free_0;
3104         }
3105
3106         on_each_cpu(hardware_enable, NULL, 0, 1);
3107         r = register_cpu_notifier(&kvm_cpu_notifier);
3108         if (r)
3109                 goto out_free_1;
3110         register_reboot_notifier(&kvm_reboot_notifier);
3111
3112         r = sysdev_class_register(&kvm_sysdev_class);
3113         if (r)
3114                 goto out_free_2;
3115
3116         r = sysdev_register(&kvm_sysdev);
3117         if (r)
3118                 goto out_free_3;
3119
3120         /* A kmem cache lets us meet the alignment requirements of fx_save. */
3121         kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
3122                                            __alignof__(struct kvm_vcpu), 0, 0);
3123         if (!kvm_vcpu_cache) {
3124                 r = -ENOMEM;
3125                 goto out_free_4;
3126         }
3127
3128         kvm_chardev_ops.owner = module;
3129
3130         r = misc_register(&kvm_dev);
3131         if (r) {
3132                 printk (KERN_ERR "kvm: misc device register failed\n");
3133                 goto out_free;
3134         }
3135
3136         kvm_preempt_ops.sched_in = kvm_sched_in;
3137         kvm_preempt_ops.sched_out = kvm_sched_out;
3138
3139         return r;
3140
3141 out_free:
3142         kmem_cache_destroy(kvm_vcpu_cache);
3143 out_free_4:
3144         sysdev_unregister(&kvm_sysdev);
3145 out_free_3:
3146         sysdev_class_unregister(&kvm_sysdev_class);
3147 out_free_2:
3148         unregister_reboot_notifier(&kvm_reboot_notifier);
3149         unregister_cpu_notifier(&kvm_cpu_notifier);
3150 out_free_1:
3151         on_each_cpu(hardware_disable, NULL, 0, 1);
3152 out_free_0:
3153         kvm_arch_ops->hardware_unsetup();
3154 out:
3155         kvm_arch_ops = NULL;
3156         return r;
3157 }
3158
3159 void kvm_exit_arch(void)
3160 {
3161         misc_deregister(&kvm_dev);
3162         kmem_cache_destroy(kvm_vcpu_cache);
3163         sysdev_unregister(&kvm_sysdev);
3164         sysdev_class_unregister(&kvm_sysdev_class);
3165         unregister_reboot_notifier(&kvm_reboot_notifier);
3166         unregister_cpu_notifier(&kvm_cpu_notifier);
3167         on_each_cpu(hardware_disable, NULL, 0, 1);
3168         kvm_arch_ops->hardware_unsetup();
3169         kvm_arch_ops = NULL;
3170 }
3171
3172 static __init int kvm_init(void)
3173 {
3174         static struct page *bad_page;
3175         int r;
3176
3177         r = kvm_mmu_module_init();
3178         if (r)
3179                 goto out4;
3180
3181         kvm_init_debug();
3182
3183         kvm_init_msr_list();
3184
3185         if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
3186                 r = -ENOMEM;
3187                 goto out;
3188         }
3189
3190         bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
3191         memset(__va(bad_page_address), 0, PAGE_SIZE);
3192
3193         return 0;
3194
3195 out:
3196         kvm_exit_debug();
3197         kvm_mmu_module_exit();
3198 out4:
3199         return r;
3200 }
3201
3202 static __exit void kvm_exit(void)
3203 {
3204         kvm_exit_debug();
3205         __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
3206         kvm_mmu_module_exit();
3207 }
3208
3209 module_init(kvm_init)
3210 module_exit(kvm_exit)
3211
3212 EXPORT_SYMBOL_GPL(kvm_init_arch);
3213 EXPORT_SYMBOL_GPL(kvm_exit_arch);