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   <avi@qumranet.com>
  11  *   Yaniv Kamay  <yaniv@qumranet.com>
  12  *
  13  * This work is licensed under the terms of the GNU GPL, version 2.  See
  14  * the COPYING file in the top-level directory.
  15  *
  16  */
  17
  18 #include "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         vcpu->pio.string = 0;
1225         r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1226         if (vcpu->pio.string)
1227                 return EMULATE_DO_MMIO;
1228
1229         if ((r || vcpu->mmio_is_write) && run) {
1230                 run->exit_reason = KVM_EXIT_MMIO;
1231                 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1232                 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1233                 run->mmio.len = vcpu->mmio_size;
1234                 run->mmio.is_write = vcpu->mmio_is_write;
1235         }
1236
1237         if (r) {
1238                 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1239                         return EMULATE_DONE;
1240                 if (!vcpu->mmio_needed) {
1241                         report_emulation_failure(&emulate_ctxt);
1242                         return EMULATE_FAIL;
1243                 }
1244                 return EMULATE_DO_MMIO;
1245         }
1246
1247         kvm_arch_ops->decache_regs(vcpu);
1248         kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1249
1250         if (vcpu->mmio_is_write) {
1251                 vcpu->mmio_needed = 0;
1252                 return EMULATE_DO_MMIO;
1253         }
1254
1255         return EMULATE_DONE;
1256 }
1257 EXPORT_SYMBOL_GPL(emulate_instruction);
1258
1259 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
1260 {
1261         if (vcpu->irq_summary)
1262                 return 1;
1263
1264         vcpu->run->exit_reason = KVM_EXIT_HLT;
1265         ++vcpu->stat.halt_exits;
1266         return 0;
1267 }
1268 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
1269
1270 int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run)
1271 {
1272         unsigned long nr, a0, a1, a2, a3, a4, a5, ret;
1273
1274         kvm_arch_ops->cache_regs(vcpu);
1275         ret = -KVM_EINVAL;
1276 #ifdef CONFIG_X86_64
1277         if (is_long_mode(vcpu)) {
1278                 nr = vcpu->regs[VCPU_REGS_RAX];
1279                 a0 = vcpu->regs[VCPU_REGS_RDI];
1280                 a1 = vcpu->regs[VCPU_REGS_RSI];
1281                 a2 = vcpu->regs[VCPU_REGS_RDX];
1282                 a3 = vcpu->regs[VCPU_REGS_RCX];
1283                 a4 = vcpu->regs[VCPU_REGS_R8];
1284                 a5 = vcpu->regs[VCPU_REGS_R9];
1285         } else
1286 #endif
1287         {
1288                 nr = vcpu->regs[VCPU_REGS_RBX] & -1u;
1289                 a0 = vcpu->regs[VCPU_REGS_RAX] & -1u;
1290                 a1 = vcpu->regs[VCPU_REGS_RCX] & -1u;
1291                 a2 = vcpu->regs[VCPU_REGS_RDX] & -1u;
1292                 a3 = vcpu->regs[VCPU_REGS_RSI] & -1u;
1293                 a4 = vcpu->regs[VCPU_REGS_RDI] & -1u;
1294                 a5 = vcpu->regs[VCPU_REGS_RBP] & -1u;
1295         }
1296         switch (nr) {
1297         default:
1298                 run->hypercall.nr = nr;
1299                 run->hypercall.args[0] = a0;
1300                 run->hypercall.args[1] = a1;
1301                 run->hypercall.args[2] = a2;
1302                 run->hypercall.args[3] = a3;
1303                 run->hypercall.args[4] = a4;
1304                 run->hypercall.args[5] = a5;
1305                 run->hypercall.ret = ret;
1306                 run->hypercall.longmode = is_long_mode(vcpu);
1307                 kvm_arch_ops->decache_regs(vcpu);
1308                 return 0;
1309         }
1310         vcpu->regs[VCPU_REGS_RAX] = ret;
1311         kvm_arch_ops->decache_regs(vcpu);
1312         return 1;
1313 }
1314 EXPORT_SYMBOL_GPL(kvm_hypercall);
1315
1316 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1317 {
1318         return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1319 }
1320
1321 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1322 {
1323         struct descriptor_table dt = { limit, base };
1324
1325         kvm_arch_ops->set_gdt(vcpu, &dt);
1326 }
1327
1328 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1329 {
1330         struct descriptor_table dt = { limit, base };
1331
1332         kvm_arch_ops->set_idt(vcpu, &dt);
1333 }
1334
1335 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1336                    unsigned long *rflags)
1337 {
1338         lmsw(vcpu, msw);
1339         *rflags = kvm_arch_ops->get_rflags(vcpu);
1340 }
1341
1342 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1343 {
1344         kvm_arch_ops->decache_cr4_guest_bits(vcpu);
1345         switch (cr) {
1346         case 0:
1347                 return vcpu->cr0;
1348         case 2:
1349                 return vcpu->cr2;
1350         case 3:
1351                 return vcpu->cr3;
1352         case 4:
1353                 return vcpu->cr4;
1354         default:
1355                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1356                 return 0;
1357         }
1358 }
1359
1360 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1361                      unsigned long *rflags)
1362 {
1363         switch (cr) {
1364         case 0:
1365                 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1366                 *rflags = kvm_arch_ops->get_rflags(vcpu);
1367                 break;
1368         case 2:
1369                 vcpu->cr2 = val;
1370                 break;
1371         case 3:
1372                 set_cr3(vcpu, val);
1373                 break;
1374         case 4:
1375                 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1376                 break;
1377         default:
1378                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1379         }
1380 }
1381
1382 /*
1383  * Register the para guest with the host:
1384  */
1385 static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa)
1386 {
1387         struct kvm_vcpu_para_state *para_state;
1388         hpa_t para_state_hpa, hypercall_hpa;
1389         struct page *para_state_page;
1390         unsigned char *hypercall;
1391         gpa_t hypercall_gpa;
1392
1393         printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n");
1394         printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa);
1395
1396         /*
1397          * Needs to be page aligned:
1398          */
1399         if (para_state_gpa != PAGE_ALIGN(para_state_gpa))
1400                 goto err_gp;
1401
1402         para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa);
1403         printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa);
1404         if (is_error_hpa(para_state_hpa))
1405                 goto err_gp;
1406
1407         mark_page_dirty(vcpu->kvm, para_state_gpa >> PAGE_SHIFT);
1408         para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT);
1409         para_state = kmap(para_state_page);
1410
1411         printk(KERN_DEBUG "....  guest version: %d\n", para_state->guest_version);
1412         printk(KERN_DEBUG "....           size: %d\n", para_state->size);
1413
1414         para_state->host_version = KVM_PARA_API_VERSION;
1415         /*
1416          * We cannot support guests that try to register themselves
1417          * with a newer API version than the host supports:
1418          */
1419         if (para_state->guest_version > KVM_PARA_API_VERSION) {
1420                 para_state->ret = -KVM_EINVAL;
1421                 goto err_kunmap_skip;
1422         }
1423
1424         hypercall_gpa = para_state->hypercall_gpa;
1425         hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa);
1426         printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa);
1427         if (is_error_hpa(hypercall_hpa)) {
1428                 para_state->ret = -KVM_EINVAL;
1429                 goto err_kunmap_skip;
1430         }
1431
1432         printk(KERN_DEBUG "kvm: para guest successfully registered.\n");
1433         vcpu->para_state_page = para_state_page;
1434         vcpu->para_state_gpa = para_state_gpa;
1435         vcpu->hypercall_gpa = hypercall_gpa;
1436
1437         mark_page_dirty(vcpu->kvm, hypercall_gpa >> PAGE_SHIFT);
1438         hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT),
1439                                 KM_USER1) + (hypercall_hpa & ~PAGE_MASK);
1440         kvm_arch_ops->patch_hypercall(vcpu, hypercall);
1441         kunmap_atomic(hypercall, KM_USER1);
1442
1443         para_state->ret = 0;
1444 err_kunmap_skip:
1445         kunmap(para_state_page);
1446         return 0;
1447 err_gp:
1448         return 1;
1449 }
1450
1451 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1452 {
1453         u64 data;
1454
1455         switch (msr) {
1456         case 0xc0010010: /* SYSCFG */
1457         case 0xc0010015: /* HWCR */
1458         case MSR_IA32_PLATFORM_ID:
1459         case MSR_IA32_P5_MC_ADDR:
1460         case MSR_IA32_P5_MC_TYPE:
1461         case MSR_IA32_MC0_CTL:
1462         case MSR_IA32_MCG_STATUS:
1463         case MSR_IA32_MCG_CAP:
1464         case MSR_IA32_MC0_MISC:
1465         case MSR_IA32_MC0_MISC+4:
1466         case MSR_IA32_MC0_MISC+8:
1467         case MSR_IA32_MC0_MISC+12:
1468         case MSR_IA32_MC0_MISC+16:
1469         case MSR_IA32_UCODE_REV:
1470         case MSR_IA32_PERF_STATUS:
1471         case MSR_IA32_EBL_CR_POWERON:
1472                 /* MTRR registers */
1473         case 0xfe:
1474         case 0x200 ... 0x2ff:
1475                 data = 0;
1476                 break;
1477         case 0xcd: /* fsb frequency */
1478                 data = 3;
1479                 break;
1480         case MSR_IA32_APICBASE:
1481                 data = vcpu->apic_base;
1482                 break;
1483         case MSR_IA32_MISC_ENABLE:
1484                 data = vcpu->ia32_misc_enable_msr;
1485                 break;
1486 #ifdef CONFIG_X86_64
1487         case MSR_EFER:
1488                 data = vcpu->shadow_efer;
1489                 break;
1490 #endif
1491         default:
1492                 pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
1493                 return 1;
1494         }
1495         *pdata = data;
1496         return 0;
1497 }
1498 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1499
1500 /*
1501  * Reads an msr value (of 'msr_index') into 'pdata'.
1502  * Returns 0 on success, non-0 otherwise.
1503  * Assumes vcpu_load() was already called.
1504  */
1505 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1506 {
1507         return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1508 }
1509
1510 #ifdef CONFIG_X86_64
1511
1512 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
1513 {
1514         if (efer & EFER_RESERVED_BITS) {
1515                 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1516                        efer);
1517                 inject_gp(vcpu);
1518                 return;
1519         }
1520
1521         if (is_paging(vcpu)
1522             && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1523                 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1524                 inject_gp(vcpu);
1525                 return;
1526         }
1527
1528         kvm_arch_ops->set_efer(vcpu, efer);
1529
1530         efer &= ~EFER_LMA;
1531         efer |= vcpu->shadow_efer & EFER_LMA;
1532
1533         vcpu->shadow_efer = efer;
1534 }
1535
1536 #endif
1537
1538 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1539 {
1540         switch (msr) {
1541 #ifdef CONFIG_X86_64
1542         case MSR_EFER:
1543                 set_efer(vcpu, data);
1544                 break;
1545 #endif
1546         case MSR_IA32_MC0_STATUS:
1547                 pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1548                        __FUNCTION__, data);
1549                 break;
1550         case MSR_IA32_MCG_STATUS:
1551                 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
1552                         __FUNCTION__, data);
1553                 break;
1554         case MSR_IA32_UCODE_REV:
1555         case MSR_IA32_UCODE_WRITE:
1556         case 0x200 ... 0x2ff: /* MTRRs */
1557                 break;
1558         case MSR_IA32_APICBASE:
1559                 vcpu->apic_base = data;
1560                 break;
1561         case MSR_IA32_MISC_ENABLE:
1562                 vcpu->ia32_misc_enable_msr = data;
1563                 break;
1564         /*
1565          * This is the 'probe whether the host is KVM' logic:
1566          */
1567         case MSR_KVM_API_MAGIC:
1568                 return vcpu_register_para(vcpu, data);
1569
1570         default:
1571                 pr_unimpl(vcpu, "unhandled wrmsr: 0x%x\n", msr);
1572                 return 1;
1573         }
1574         return 0;
1575 }
1576 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1577
1578 /*
1579  * Writes msr value into into the appropriate "register".
1580  * Returns 0 on success, non-0 otherwise.
1581  * Assumes vcpu_load() was already called.
1582  */
1583 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1584 {
1585         return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1586 }
1587
1588 void kvm_resched(struct kvm_vcpu *vcpu)
1589 {
1590         if (!need_resched())
1591                 return;
1592         cond_resched();
1593 }
1594 EXPORT_SYMBOL_GPL(kvm_resched);
1595
1596 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
1597 {
1598         int i;
1599         u32 function;
1600         struct kvm_cpuid_entry *e, *best;
1601
1602         kvm_arch_ops->cache_regs(vcpu);
1603         function = vcpu->regs[VCPU_REGS_RAX];
1604         vcpu->regs[VCPU_REGS_RAX] = 0;
1605         vcpu->regs[VCPU_REGS_RBX] = 0;
1606         vcpu->regs[VCPU_REGS_RCX] = 0;
1607         vcpu->regs[VCPU_REGS_RDX] = 0;
1608         best = NULL;
1609         for (i = 0; i < vcpu->cpuid_nent; ++i) {
1610                 e = &vcpu->cpuid_entries[i];
1611                 if (e->function == function) {
1612                         best = e;
1613                         break;
1614                 }
1615                 /*
1616                  * Both basic or both extended?
1617                  */
1618                 if (((e->function ^ function) & 0x80000000) == 0)
1619                         if (!best || e->function > best->function)
1620                                 best = e;
1621         }
1622         if (best) {
1623                 vcpu->regs[VCPU_REGS_RAX] = best->eax;
1624                 vcpu->regs[VCPU_REGS_RBX] = best->ebx;
1625                 vcpu->regs[VCPU_REGS_RCX] = best->ecx;
1626                 vcpu->regs[VCPU_REGS_RDX] = best->edx;
1627         }
1628         kvm_arch_ops->decache_regs(vcpu);
1629         kvm_arch_ops->skip_emulated_instruction(vcpu);
1630 }
1631 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
1632
1633 static int pio_copy_data(struct kvm_vcpu *vcpu)
1634 {
1635         void *p = vcpu->pio_data;
1636         void *q;
1637         unsigned bytes;
1638         int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
1639
1640         q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
1641                  PAGE_KERNEL);
1642         if (!q) {
1643                 free_pio_guest_pages(vcpu);
1644                 return -ENOMEM;
1645         }
1646         q += vcpu->pio.guest_page_offset;
1647         bytes = vcpu->pio.size * vcpu->pio.cur_count;
1648         if (vcpu->pio.in)
1649                 memcpy(q, p, bytes);
1650         else
1651                 memcpy(p, q, bytes);
1652         q -= vcpu->pio.guest_page_offset;
1653         vunmap(q);
1654         free_pio_guest_pages(vcpu);
1655         return 0;
1656 }
1657
1658 static int complete_pio(struct kvm_vcpu *vcpu)
1659 {
1660         struct kvm_pio_request *io = &vcpu->pio;
1661         long delta;
1662         int r;
1663
1664         kvm_arch_ops->cache_regs(vcpu);
1665
1666         if (!io->string) {
1667                 if (io->in)
1668                         memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
1669                                io->size);
1670         } else {
1671                 if (io->in) {
1672                         r = pio_copy_data(vcpu);
1673                         if (r) {
1674                                 kvm_arch_ops->cache_regs(vcpu);
1675                                 return r;
1676                         }
1677                 }
1678
1679                 delta = 1;
1680                 if (io->rep) {
1681                         delta *= io->cur_count;
1682                         /*
1683                          * The size of the register should really depend on
1684                          * current address size.
1685                          */
1686                         vcpu->regs[VCPU_REGS_RCX] -= delta;
1687                 }
1688                 if (io->down)
1689                         delta = -delta;
1690                 delta *= io->size;
1691                 if (io->in)
1692                         vcpu->regs[VCPU_REGS_RDI] += delta;
1693                 else
1694                         vcpu->regs[VCPU_REGS_RSI] += delta;
1695         }
1696
1697         kvm_arch_ops->decache_regs(vcpu);
1698
1699         io->count -= io->cur_count;
1700         io->cur_count = 0;
1701
1702         if (!io->count)
1703                 kvm_arch_ops->skip_emulated_instruction(vcpu);
1704         return 0;
1705 }
1706
1707 static void kernel_pio(struct kvm_io_device *pio_dev,
1708                        struct kvm_vcpu *vcpu,
1709                        void *pd)
1710 {
1711         /* TODO: String I/O for in kernel device */
1712
1713         if (vcpu->pio.in)
1714                 kvm_iodevice_read(pio_dev, vcpu->pio.port,
1715                                   vcpu->pio.size,
1716                                   pd);
1717         else
1718                 kvm_iodevice_write(pio_dev, vcpu->pio.port,
1719                                    vcpu->pio.size,
1720                                    pd);
1721 }
1722
1723 static void pio_string_write(struct kvm_io_device *pio_dev,
1724                              struct kvm_vcpu *vcpu)
1725 {
1726         struct kvm_pio_request *io = &vcpu->pio;
1727         void *pd = vcpu->pio_data;
1728         int i;
1729
1730         for (i = 0; i < io->cur_count; i++) {
1731                 kvm_iodevice_write(pio_dev, io->port,
1732                                    io->size,
1733                                    pd);
1734                 pd += io->size;
1735         }
1736 }
1737
1738 int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1739                   int size, unsigned long count, int string, int down,
1740                   gva_t address, int rep, unsigned port)
1741 {
1742         unsigned now, in_page;
1743         int i, ret = 0;
1744         int nr_pages = 1;
1745         struct page *page;
1746         struct kvm_io_device *pio_dev;
1747
1748         vcpu->run->exit_reason = KVM_EXIT_IO;
1749         vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1750         vcpu->run->io.size = size;
1751         vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1752         vcpu->run->io.count = count;
1753         vcpu->run->io.port = port;
1754         vcpu->pio.count = count;
1755         vcpu->pio.cur_count = count;
1756         vcpu->pio.size = size;
1757         vcpu->pio.in = in;
1758         vcpu->pio.port = port;
1759         vcpu->pio.string = string;
1760         vcpu->pio.down = down;
1761         vcpu->pio.guest_page_offset = offset_in_page(address);
1762         vcpu->pio.rep = rep;
1763
1764         pio_dev = vcpu_find_pio_dev(vcpu, port);
1765         if (!string) {
1766                 kvm_arch_ops->cache_regs(vcpu);
1767                 memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
1768                 kvm_arch_ops->decache_regs(vcpu);
1769                 if (pio_dev) {
1770                         kernel_pio(pio_dev, vcpu, vcpu->pio_data);
1771                         complete_pio(vcpu);
1772                         return 1;
1773                 }
1774                 return 0;
1775         }
1776
1777         if (!count) {
1778                 kvm_arch_ops->skip_emulated_instruction(vcpu);
1779                 return 1;
1780         }
1781
1782         if (!down)
1783                 in_page = PAGE_SIZE - offset_in_page(address);
1784         else
1785                 in_page = offset_in_page(address) + size;
1786         now = min(count, (unsigned long)in_page / size);
1787         if (!now) {
1788                 /*
1789                  * String I/O straddles page boundary.  Pin two guest pages
1790                  * so that we satisfy atomicity constraints.  Do just one
1791                  * transaction to avoid complexity.
1792                  */
1793                 nr_pages = 2;
1794                 now = 1;
1795         }
1796         if (down) {
1797                 /*
1798                  * String I/O in reverse.  Yuck.  Kill the guest, fix later.
1799                  */
1800                 pr_unimpl(vcpu, "guest string pio down\n");
1801                 inject_gp(vcpu);
1802                 return 1;
1803         }
1804         vcpu->run->io.count = now;
1805         vcpu->pio.cur_count = now;
1806
1807         for (i = 0; i < nr_pages; ++i) {
1808                 mutex_lock(&vcpu->kvm->lock);
1809                 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
1810                 if (page)
1811                         get_page(page);
1812                 vcpu->pio.guest_pages[i] = page;
1813                 mutex_unlock(&vcpu->kvm->lock);
1814                 if (!page) {
1815                         inject_gp(vcpu);
1816                         free_pio_guest_pages(vcpu);
1817                         return 1;
1818                 }
1819         }
1820
1821         if (!vcpu->pio.in) {
1822                 /* string PIO write */
1823                 ret = pio_copy_data(vcpu);
1824                 if (ret >= 0 && pio_dev) {
1825                         pio_string_write(pio_dev, vcpu);
1826                         complete_pio(vcpu);
1827                         if (vcpu->pio.count == 0)
1828                                 ret = 1;
1829                 }
1830         } else if (pio_dev)
1831                 pr_unimpl(vcpu, "no string pio read support yet, "
1832                        "port %x size %d count %ld\n",
1833                         port, size, count);
1834
1835         return ret;
1836 }
1837 EXPORT_SYMBOL_GPL(kvm_setup_pio);
1838
1839 static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1840 {
1841         int r;
1842         sigset_t sigsaved;
1843
1844         vcpu_load(vcpu);
1845
1846         if (vcpu->sigset_active)
1847                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
1848
1849         /* re-sync apic's tpr */
1850         vcpu->cr8 = kvm_run->cr8;
1851
1852         if (vcpu->pio.cur_count) {
1853                 r = complete_pio(vcpu);
1854                 if (r)
1855                         goto out;
1856         }
1857
1858         if (vcpu->mmio_needed) {
1859                 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1860                 vcpu->mmio_read_completed = 1;
1861                 vcpu->mmio_needed = 0;
1862                 r = emulate_instruction(vcpu, kvm_run,
1863                                         vcpu->mmio_fault_cr2, 0);
1864                 if (r == EMULATE_DO_MMIO) {
1865                         /*
1866                          * Read-modify-write.  Back to userspace.
1867                          */
1868                         r = 0;
1869                         goto out;
1870                 }
1871         }
1872
1873         if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
1874                 kvm_arch_ops->cache_regs(vcpu);
1875                 vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
1876                 kvm_arch_ops->decache_regs(vcpu);
1877         }
1878
1879         r = kvm_arch_ops->run(vcpu, kvm_run);
1880
1881 out:
1882         if (vcpu->sigset_active)
1883                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1884
1885         vcpu_put(vcpu);
1886         return r;
1887 }
1888
1889 static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
1890                                    struct kvm_regs *regs)
1891 {
1892         vcpu_load(vcpu);
1893
1894         kvm_arch_ops->cache_regs(vcpu);
1895
1896         regs->rax = vcpu->regs[VCPU_REGS_RAX];
1897         regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1898         regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1899         regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1900         regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1901         regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1902         regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1903         regs->rbp = vcpu->regs[VCPU_REGS_RBP];
1904 #ifdef CONFIG_X86_64
1905         regs->r8 = vcpu->regs[VCPU_REGS_R8];
1906         regs->r9 = vcpu->regs[VCPU_REGS_R9];
1907         regs->r10 = vcpu->regs[VCPU_REGS_R10];
1908         regs->r11 = vcpu->regs[VCPU_REGS_R11];
1909         regs->r12 = vcpu->regs[VCPU_REGS_R12];
1910         regs->r13 = vcpu->regs[VCPU_REGS_R13];
1911         regs->r14 = vcpu->regs[VCPU_REGS_R14];
1912         regs->r15 = vcpu->regs[VCPU_REGS_R15];
1913 #endif
1914
1915         regs->rip = vcpu->rip;
1916         regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1917
1918         /*
1919          * Don't leak debug flags in case they were set for guest debugging
1920          */
1921         if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1922                 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1923
1924         vcpu_put(vcpu);
1925
1926         return 0;
1927 }
1928
1929 static int kvm_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
1930                                    struct kvm_regs *regs)
1931 {
1932         vcpu_load(vcpu);
1933
1934         vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1935         vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1936         vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1937         vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1938         vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1939         vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1940         vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1941         vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
1942 #ifdef CONFIG_X86_64
1943         vcpu->regs[VCPU_REGS_R8] = regs->r8;
1944         vcpu->regs[VCPU_REGS_R9] = regs->r9;
1945         vcpu->regs[VCPU_REGS_R10] = regs->r10;
1946         vcpu->regs[VCPU_REGS_R11] = regs->r11;
1947         vcpu->regs[VCPU_REGS_R12] = regs->r12;
1948         vcpu->regs[VCPU_REGS_R13] = regs->r13;
1949         vcpu->regs[VCPU_REGS_R14] = regs->r14;
1950         vcpu->regs[VCPU_REGS_R15] = regs->r15;
1951 #endif
1952
1953         vcpu->rip = regs->rip;
1954         kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1955
1956         kvm_arch_ops->decache_regs(vcpu);
1957
1958         vcpu_put(vcpu);
1959
1960         return 0;
1961 }
1962
1963 static void get_segment(struct kvm_vcpu *vcpu,
1964                         struct kvm_segment *var, int seg)
1965 {
1966         return kvm_arch_ops->get_segment(vcpu, var, seg);
1967 }
1968
1969 static int kvm_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
1970                                     struct kvm_sregs *sregs)
1971 {
1972         struct descriptor_table dt;
1973
1974         vcpu_load(vcpu);
1975
1976         get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1977         get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1978         get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1979         get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1980         get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1981         get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1982
1983         get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1984         get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1985
1986         kvm_arch_ops->get_idt(vcpu, &dt);
1987         sregs->idt.limit = dt.limit;
1988         sregs->idt.base = dt.base;
1989         kvm_arch_ops->get_gdt(vcpu, &dt);
1990         sregs->gdt.limit = dt.limit;
1991         sregs->gdt.base = dt.base;
1992
1993         kvm_arch_ops->decache_cr4_guest_bits(vcpu);
1994         sregs->cr0 = vcpu->cr0;
1995         sregs->cr2 = vcpu->cr2;
1996         sregs->cr3 = vcpu->cr3;
1997         sregs->cr4 = vcpu->cr4;
1998         sregs->cr8 = vcpu->cr8;
1999         sregs->efer = vcpu->shadow_efer;
2000         sregs->apic_base = vcpu->apic_base;
2001
2002         memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
2003                sizeof sregs->interrupt_bitmap);
2004
2005         vcpu_put(vcpu);
2006
2007         return 0;
2008 }
2009
2010 static void set_segment(struct kvm_vcpu *vcpu,
2011                         struct kvm_segment *var, int seg)
2012 {
2013         return kvm_arch_ops->set_segment(vcpu, var, seg);
2014 }
2015
2016 static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2017                                     struct kvm_sregs *sregs)
2018 {
2019         int mmu_reset_needed = 0;
2020         int i;
2021         struct descriptor_table dt;
2022
2023         vcpu_load(vcpu);
2024
2025         dt.limit = sregs->idt.limit;
2026         dt.base = sregs->idt.base;
2027         kvm_arch_ops->set_idt(vcpu, &dt);
2028         dt.limit = sregs->gdt.limit;
2029         dt.base = sregs->gdt.base;
2030         kvm_arch_ops->set_gdt(vcpu, &dt);
2031
2032         vcpu->cr2 = sregs->cr2;
2033         mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
2034         vcpu->cr3 = sregs->cr3;
2035
2036         vcpu->cr8 = sregs->cr8;
2037
2038         mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
2039 #ifdef CONFIG_X86_64
2040         kvm_arch_ops->set_efer(vcpu, sregs->efer);
2041 #endif
2042         vcpu->apic_base = sregs->apic_base;
2043
2044         kvm_arch_ops->decache_cr4_guest_bits(vcpu);
2045
2046         mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
2047         kvm_arch_ops->set_cr0(vcpu, sregs->cr0);
2048
2049         mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
2050         kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
2051         if (!is_long_mode(vcpu) && is_pae(vcpu))
2052                 load_pdptrs(vcpu, vcpu->cr3);
2053
2054         if (mmu_reset_needed)
2055                 kvm_mmu_reset_context(vcpu);
2056
2057         memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
2058                sizeof vcpu->irq_pending);
2059         vcpu->irq_summary = 0;
2060         for (i = 0; i < ARRAY_SIZE(vcpu->irq_pending); ++i)
2061                 if (vcpu->irq_pending[i])
2062                         __set_bit(i, &vcpu->irq_summary);
2063
2064         set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2065         set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2066         set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2067         set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2068         set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2069         set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2070
2071         set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2072         set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2073
2074         vcpu_put(vcpu);
2075
2076         return 0;
2077 }
2078
2079 /*
2080  * List of msr numbers which we expose to userspace through KVM_GET_MSRS
2081  * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
2082  *
2083  * This list is modified at module load time to reflect the
2084  * capabilities of the host cpu.
2085  */
2086 static u32 msrs_to_save[] = {
2087         MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
2088         MSR_K6_STAR,
2089 #ifdef CONFIG_X86_64
2090         MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
2091 #endif
2092         MSR_IA32_TIME_STAMP_COUNTER,
2093 };
2094
2095 static unsigned num_msrs_to_save;
2096
2097 static u32 emulated_msrs[] = {
2098         MSR_IA32_MISC_ENABLE,
2099 };
2100
2101 static __init void kvm_init_msr_list(void)
2102 {
2103         u32 dummy[2];
2104         unsigned i, j;
2105
2106         for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
2107                 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
2108                         continue;
2109                 if (j < i)
2110                         msrs_to_save[j] = msrs_to_save[i];
2111                 j++;
2112         }
2113         num_msrs_to_save = j;
2114 }
2115
2116 /*
2117  * Adapt set_msr() to msr_io()'s calling convention
2118  */
2119 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
2120 {
2121         return kvm_set_msr(vcpu, index, *data);
2122 }
2123
2124 /*
2125  * Read or write a bunch of msrs. All parameters are kernel addresses.
2126  *
2127  * @return number of msrs set successfully.
2128  */
2129 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
2130                     struct kvm_msr_entry *entries,
2131                     int (*do_msr)(struct kvm_vcpu *vcpu,
2132                                   unsigned index, u64 *data))
2133 {
2134         int i;
2135
2136         vcpu_load(vcpu);
2137
2138         for (i = 0; i < msrs->nmsrs; ++i)
2139                 if (do_msr(vcpu, entries[i].index, &entries[i].data))
2140                         break;
2141
2142         vcpu_put(vcpu);
2143
2144         return i;
2145 }
2146
2147 /*
2148  * Read or write a bunch of msrs. Parameters are user addresses.
2149  *
2150  * @return number of msrs set successfully.
2151  */
2152 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
2153                   int (*do_msr)(struct kvm_vcpu *vcpu,
2154                                 unsigned index, u64 *data),
2155                   int writeback)
2156 {
2157         struct kvm_msrs msrs;
2158         struct kvm_msr_entry *entries;
2159         int r, n;
2160         unsigned size;
2161
2162         r = -EFAULT;
2163         if (copy_from_user(&msrs, user_msrs, sizeof msrs))
2164                 goto out;
2165
2166         r = -E2BIG;
2167         if (msrs.nmsrs >= MAX_IO_MSRS)
2168                 goto out;
2169
2170         r = -ENOMEM;
2171         size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
2172         entries = vmalloc(size);
2173         if (!entries)
2174                 goto out;
2175
2176         r = -EFAULT;
2177         if (copy_from_user(entries, user_msrs->entries, size))
2178                 goto out_free;
2179
2180         r = n = __msr_io(vcpu, &msrs, entries, do_msr);
2181         if (r < 0)
2182                 goto out_free;
2183
2184         r = -EFAULT;
2185         if (writeback && copy_to_user(user_msrs->entries, entries, size))
2186                 goto out_free;
2187
2188         r = n;
2189
2190 out_free:
2191         vfree(entries);
2192 out:
2193         return r;
2194 }
2195
2196 /*
2197  * Translate a guest virtual address to a guest physical address.
2198  */
2199 static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2200                                     struct kvm_translation *tr)
2201 {
2202         unsigned long vaddr = tr->linear_address;
2203         gpa_t gpa;
2204
2205         vcpu_load(vcpu);
2206         mutex_lock(&vcpu->kvm->lock);
2207         gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
2208         tr->physical_address = gpa;
2209         tr->valid = gpa != UNMAPPED_GVA;
2210         tr->writeable = 1;
2211         tr->usermode = 0;
2212         mutex_unlock(&vcpu->kvm->lock);
2213         vcpu_put(vcpu);
2214
2215         return 0;
2216 }
2217
2218 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2219                                     struct kvm_interrupt *irq)
2220 {
2221         if (irq->irq < 0 || irq->irq >= 256)
2222                 return -EINVAL;
2223         vcpu_load(vcpu);
2224
2225         set_bit(irq->irq, vcpu->irq_pending);
2226         set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
2227
2228         vcpu_put(vcpu);
2229
2230         return 0;
2231 }
2232
2233 static int kvm_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
2234                                       struct kvm_debug_guest *dbg)
2235 {
2236         int r;
2237
2238         vcpu_load(vcpu);
2239
2240         r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
2241
2242         vcpu_put(vcpu);
2243
2244         return r;
2245 }
2246
2247 static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
2248                                     unsigned long address,
2249                                     int *type)
2250 {
2251         struct kvm_vcpu *vcpu = vma->vm_file->private_data;
2252         unsigned long pgoff;
2253         struct page *page;
2254
2255         pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
2256         if (pgoff == 0)
2257                 page = virt_to_page(vcpu->run);
2258         else if (pgoff == KVM_PIO_PAGE_OFFSET)
2259                 page = virt_to_page(vcpu->pio_data);
2260         else
2261                 return NOPAGE_SIGBUS;
2262         get_page(page);
2263         if (type != NULL)
2264                 *type = VM_FAULT_MINOR;
2265
2266         return page;
2267 }
2268
2269 static struct vm_operations_struct kvm_vcpu_vm_ops = {
2270         .nopage = kvm_vcpu_nopage,
2271 };
2272
2273 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2274 {
2275         vma->vm_ops = &kvm_vcpu_vm_ops;
2276         return 0;
2277 }
2278
2279 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2280 {
2281         struct kvm_vcpu *vcpu = filp->private_data;
2282
2283         fput(vcpu->kvm->filp);
2284         return 0;
2285 }
2286
2287 static struct file_operations kvm_vcpu_fops = {
2288         .release        = kvm_vcpu_release,
2289         .unlocked_ioctl = kvm_vcpu_ioctl,
2290         .compat_ioctl   = kvm_vcpu_ioctl,
2291         .mmap           = kvm_vcpu_mmap,
2292 };
2293
2294 /*
2295  * Allocates an inode for the vcpu.
2296  */
2297 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2298 {
2299         int fd, r;
2300         struct inode *inode;
2301         struct file *file;
2302
2303         r = anon_inode_getfd(&fd, &inode, &file,
2304                              "kvm-vcpu", &kvm_vcpu_fops, vcpu);
2305         if (r)
2306                 return r;
2307         atomic_inc(&vcpu->kvm->filp->f_count);
2308         return fd;
2309 }
2310
2311 /*
2312  * Creates some virtual cpus.  Good luck creating more than one.
2313  */
2314 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
2315 {
2316         int r;
2317         struct kvm_vcpu *vcpu;
2318
2319         if (!valid_vcpu(n))
2320                 return -EINVAL;
2321
2322         vcpu = kvm_arch_ops->vcpu_create(kvm, n);
2323         if (IS_ERR(vcpu))
2324                 return PTR_ERR(vcpu);
2325
2326         preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
2327
2328         /* We do fxsave: this must be aligned. */
2329         BUG_ON((unsigned long)&vcpu->host_fx_image & 0xF);
2330
2331         vcpu_load(vcpu);
2332         r = kvm_mmu_setup(vcpu);
2333         vcpu_put(vcpu);
2334         if (r < 0)
2335                 goto free_vcpu;
2336
2337         mutex_lock(&kvm->lock);
2338         if (kvm->vcpus[n]) {
2339                 r = -EEXIST;
2340                 mutex_unlock(&kvm->lock);
2341                 goto mmu_unload;
2342         }
2343         kvm->vcpus[n] = vcpu;
2344         mutex_unlock(&kvm->lock);
2345
2346         /* Now it's all set up, let userspace reach it */
2347         r = create_vcpu_fd(vcpu);
2348         if (r < 0)
2349                 goto unlink;
2350         return r;
2351
2352 unlink:
2353         mutex_lock(&kvm->lock);
2354         kvm->vcpus[n] = NULL;
2355         mutex_unlock(&kvm->lock);
2356
2357 mmu_unload:
2358         vcpu_load(vcpu);
2359         kvm_mmu_unload(vcpu);
2360         vcpu_put(vcpu);
2361
2362 free_vcpu:
2363         kvm_arch_ops->vcpu_free(vcpu);
2364         return r;
2365 }
2366
2367 static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
2368 {
2369         u64 efer;
2370         int i;
2371         struct kvm_cpuid_entry *e, *entry;
2372
2373         rdmsrl(MSR_EFER, efer);
2374         entry = NULL;
2375         for (i = 0; i < vcpu->cpuid_nent; ++i) {
2376                 e = &vcpu->cpuid_entries[i];
2377                 if (e->function == 0x80000001) {
2378                         entry = e;
2379                         break;
2380                 }
2381         }
2382         if (entry && (entry->edx & (1 << 20)) && !(efer & EFER_NX)) {
2383                 entry->edx &= ~(1 << 20);
2384                 printk(KERN_INFO "kvm: guest NX capability removed\n");
2385         }
2386 }
2387
2388 static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
2389                                     struct kvm_cpuid *cpuid,
2390                                     struct kvm_cpuid_entry __user *entries)
2391 {
2392         int r;
2393
2394         r = -E2BIG;
2395         if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2396                 goto out;
2397         r = -EFAULT;
2398         if (copy_from_user(&vcpu->cpuid_entries, entries,
2399                            cpuid->nent * sizeof(struct kvm_cpuid_entry)))
2400                 goto out;
2401         vcpu->cpuid_nent = cpuid->nent;
2402         cpuid_fix_nx_cap(vcpu);
2403         return 0;
2404
2405 out:
2406         return r;
2407 }
2408
2409 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2410 {
2411         if (sigset) {
2412                 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2413                 vcpu->sigset_active = 1;
2414                 vcpu->sigset = *sigset;
2415         } else
2416                 vcpu->sigset_active = 0;
2417         return 0;
2418 }
2419
2420 /*
2421  * fxsave fpu state.  Taken from x86_64/processor.h.  To be killed when
2422  * we have asm/x86/processor.h
2423  */
2424 struct fxsave {
2425         u16     cwd;
2426         u16     swd;
2427         u16     twd;
2428         u16     fop;
2429         u64     rip;
2430         u64     rdp;
2431         u32     mxcsr;
2432         u32     mxcsr_mask;
2433         u32     st_space[32];   /* 8*16 bytes for each FP-reg = 128 bytes */
2434 #ifdef CONFIG_X86_64
2435         u32     xmm_space[64];  /* 16*16 bytes for each XMM-reg = 256 bytes */
2436 #else
2437         u32     xmm_space[32];  /* 8*16 bytes for each XMM-reg = 128 bytes */
2438 #endif
2439 };
2440
2441 static int kvm_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2442 {
2443         struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
2444
2445         vcpu_load(vcpu);
2446
2447         memcpy(fpu->fpr, fxsave->st_space, 128);
2448         fpu->fcw = fxsave->cwd;
2449         fpu->fsw = fxsave->swd;
2450         fpu->ftwx = fxsave->twd;
2451         fpu->last_opcode = fxsave->fop;
2452         fpu->last_ip = fxsave->rip;
2453         fpu->last_dp = fxsave->rdp;
2454         memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
2455
2456         vcpu_put(vcpu);
2457
2458         return 0;
2459 }
2460
2461 static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2462 {
2463         struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
2464
2465         vcpu_load(vcpu);
2466
2467         memcpy(fxsave->st_space, fpu->fpr, 128);
2468         fxsave->cwd = fpu->fcw;
2469         fxsave->swd = fpu->fsw;
2470         fxsave->twd = fpu->ftwx;
2471         fxsave->fop = fpu->last_opcode;
2472         fxsave->rip = fpu->last_ip;
2473         fxsave->rdp = fpu->last_dp;
2474         memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
2475
2476         vcpu_put(vcpu);
2477
2478         return 0;
2479 }
2480
2481 static long kvm_vcpu_ioctl(struct file *filp,
2482                            unsigned int ioctl, unsigned long arg)
2483 {
2484         struct kvm_vcpu *vcpu = filp->private_data;
2485         void __user *argp = (void __user *)arg;
2486         int r = -EINVAL;
2487
2488         switch (ioctl) {
2489         case KVM_RUN:
2490                 r = -EINVAL;
2491                 if (arg)
2492                         goto out;
2493                 r = kvm_vcpu_ioctl_run(vcpu, vcpu->run);
2494                 break;
2495         case KVM_GET_REGS: {
2496                 struct kvm_regs kvm_regs;
2497
2498                 memset(&kvm_regs, 0, sizeof kvm_regs);
2499                 r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
2500                 if (r)
2501                         goto out;
2502                 r = -EFAULT;
2503                 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
2504                         goto out;
2505                 r = 0;
2506                 break;
2507         }
2508         case KVM_SET_REGS: {
2509                 struct kvm_regs kvm_regs;
2510
2511                 r = -EFAULT;
2512                 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
2513                         goto out;
2514                 r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
2515                 if (r)
2516                         goto out;
2517                 r = 0;
2518                 break;
2519         }
2520         case KVM_GET_SREGS: {
2521                 struct kvm_sregs kvm_sregs;
2522
2523                 memset(&kvm_sregs, 0, sizeof kvm_sregs);
2524                 r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
2525                 if (r)
2526                         goto out;
2527                 r = -EFAULT;
2528                 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
2529                         goto out;
2530                 r = 0;
2531                 break;
2532         }
2533         case KVM_SET_SREGS: {
2534                 struct kvm_sregs kvm_sregs;
2535
2536                 r = -EFAULT;
2537                 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
2538                         goto out;
2539                 r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
2540                 if (r)
2541                         goto out;
2542                 r = 0;
2543                 break;
2544         }
2545         case KVM_TRANSLATE: {
2546                 struct kvm_translation tr;
2547
2548                 r = -EFAULT;
2549                 if (copy_from_user(&tr, argp, sizeof tr))
2550                         goto out;
2551                 r = kvm_vcpu_ioctl_translate(vcpu, &tr);
2552                 if (r)
2553                         goto out;
2554                 r = -EFAULT;
2555                 if (copy_to_user(argp, &tr, sizeof tr))
2556                         goto out;
2557                 r = 0;
2558                 break;
2559         }
2560         case KVM_INTERRUPT: {
2561                 struct kvm_interrupt irq;
2562
2563                 r = -EFAULT;
2564                 if (copy_from_user(&irq, argp, sizeof irq))
2565                         goto out;
2566                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
2567                 if (r)
2568                         goto out;
2569                 r = 0;
2570                 break;
2571         }
2572         case KVM_DEBUG_GUEST: {
2573                 struct kvm_debug_guest dbg;
2574
2575                 r = -EFAULT;
2576                 if (copy_from_user(&dbg, argp, sizeof dbg))
2577                         goto out;
2578                 r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg);
2579                 if (r)
2580                         goto out;
2581                 r = 0;
2582                 break;
2583         }
2584         case KVM_GET_MSRS:
2585                 r = msr_io(vcpu, argp, kvm_get_msr, 1);
2586                 break;
2587         case KVM_SET_MSRS:
2588                 r = msr_io(vcpu, argp, do_set_msr, 0);
2589                 break;
2590         case KVM_SET_CPUID: {
2591                 struct kvm_cpuid __user *cpuid_arg = argp;
2592                 struct kvm_cpuid cpuid;
2593
2594                 r = -EFAULT;
2595                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2596                         goto out;
2597                 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
2598                 if (r)
2599                         goto out;
2600                 break;
2601         }
2602         case KVM_SET_SIGNAL_MASK: {
2603                 struct kvm_signal_mask __user *sigmask_arg = argp;
2604                 struct kvm_signal_mask kvm_sigmask;
2605                 sigset_t sigset, *p;
2606
2607                 p = NULL;
2608                 if (argp) {
2609                         r = -EFAULT;
2610                         if (copy_from_user(&kvm_sigmask, argp,
2611                                            sizeof kvm_sigmask))
2612                                 goto out;
2613                         r = -EINVAL;
2614                         if (kvm_sigmask.len != sizeof sigset)
2615                                 goto out;
2616                         r = -EFAULT;
2617                         if (copy_from_user(&sigset, sigmask_arg->sigset,
2618                                            sizeof sigset))
2619                                 goto out;
2620                         p = &sigset;
2621                 }
2622                 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2623                 break;
2624         }
2625         case KVM_GET_FPU: {
2626                 struct kvm_fpu fpu;
2627
2628                 memset(&fpu, 0, sizeof fpu);
2629                 r = kvm_vcpu_ioctl_get_fpu(vcpu, &fpu);
2630                 if (r)
2631                         goto out;
2632                 r = -EFAULT;
2633                 if (copy_to_user(argp, &fpu, sizeof fpu))
2634                         goto out;
2635                 r = 0;
2636                 break;
2637         }
2638         case KVM_SET_FPU: {
2639                 struct kvm_fpu fpu;
2640
2641                 r = -EFAULT;
2642                 if (copy_from_user(&fpu, argp, sizeof fpu))
2643                         goto out;
2644                 r = kvm_vcpu_ioctl_set_fpu(vcpu, &fpu);
2645                 if (r)
2646                         goto out;
2647                 r = 0;
2648                 break;
2649         }
2650         default:
2651                 ;
2652         }
2653 out:
2654         return r;
2655 }
2656
2657 static long kvm_vm_ioctl(struct file *filp,
2658                            unsigned int ioctl, unsigned long arg)
2659 {
2660         struct kvm *kvm = filp->private_data;
2661         void __user *argp = (void __user *)arg;
2662         int r = -EINVAL;
2663
2664         switch (ioctl) {
2665         case KVM_CREATE_VCPU:
2666                 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2667                 if (r < 0)
2668                         goto out;
2669                 break;
2670         case KVM_SET_MEMORY_REGION: {
2671                 struct kvm_memory_region kvm_mem;
2672
2673                 r = -EFAULT;
2674                 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
2675                         goto out;
2676                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_mem);
2677                 if (r)
2678                         goto out;
2679                 break;
2680         }
2681         case KVM_GET_DIRTY_LOG: {
2682                 struct kvm_dirty_log log;
2683
2684                 r = -EFAULT;
2685                 if (copy_from_user(&log, argp, sizeof log))
2686                         goto out;
2687                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2688                 if (r)
2689                         goto out;
2690                 break;
2691         }
2692         case KVM_SET_MEMORY_ALIAS: {
2693                 struct kvm_memory_alias alias;
2694
2695                 r = -EFAULT;
2696                 if (copy_from_user(&alias, argp, sizeof alias))
2697                         goto out;
2698                 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
2699                 if (r)
2700                         goto out;
2701                 break;
2702         }
2703         default:
2704                 ;
2705         }
2706 out:
2707         return r;
2708 }
2709
2710 static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
2711                                   unsigned long address,
2712                                   int *type)
2713 {
2714         struct kvm *kvm = vma->vm_file->private_data;
2715         unsigned long pgoff;
2716         struct page *page;
2717
2718         pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
2719         page = gfn_to_page(kvm, pgoff);
2720         if (!page)
2721                 return NOPAGE_SIGBUS;
2722         get_page(page);
2723         if (type != NULL)
2724                 *type = VM_FAULT_MINOR;
2725
2726         return page;
2727 }
2728
2729 static struct vm_operations_struct kvm_vm_vm_ops = {
2730         .nopage = kvm_vm_nopage,
2731 };
2732
2733 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2734 {
2735         vma->vm_ops = &kvm_vm_vm_ops;
2736         return 0;
2737 }
2738
2739 static struct file_operations kvm_vm_fops = {
2740         .release        = kvm_vm_release,
2741         .unlocked_ioctl = kvm_vm_ioctl,
2742         .compat_ioctl   = kvm_vm_ioctl,
2743         .mmap           = kvm_vm_mmap,
2744 };
2745
2746 static int kvm_dev_ioctl_create_vm(void)
2747 {
2748         int fd, r;
2749         struct inode *inode;
2750         struct file *file;
2751         struct kvm *kvm;
2752
2753         kvm = kvm_create_vm();
2754         if (IS_ERR(kvm))
2755                 return PTR_ERR(kvm);
2756         r = anon_inode_getfd(&fd, &inode, &file, "kvm-vm", &kvm_vm_fops, kvm);
2757         if (r) {
2758                 kvm_destroy_vm(kvm);
2759                 return r;
2760         }
2761
2762         kvm->filp = file;
2763
2764         return fd;
2765 }
2766
2767 static long kvm_dev_ioctl(struct file *filp,
2768                           unsigned int ioctl, unsigned long arg)
2769 {
2770         void __user *argp = (void __user *)arg;
2771         long r = -EINVAL;
2772
2773         switch (ioctl) {
2774         case KVM_GET_API_VERSION:
2775                 r = -EINVAL;
2776                 if (arg)
2777                         goto out;
2778                 r = KVM_API_VERSION;
2779                 break;
2780         case KVM_CREATE_VM:
2781                 r = -EINVAL;
2782                 if (arg)
2783                         goto out;
2784                 r = kvm_dev_ioctl_create_vm();
2785                 break;
2786         case KVM_GET_MSR_INDEX_LIST: {
2787                 struct kvm_msr_list __user *user_msr_list = argp;
2788                 struct kvm_msr_list msr_list;
2789                 unsigned n;
2790
2791                 r = -EFAULT;
2792                 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2793                         goto out;
2794                 n = msr_list.nmsrs;
2795                 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
2796                 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2797                         goto out;
2798                 r = -E2BIG;
2799                 if (n < num_msrs_to_save)
2800                         goto out;
2801                 r = -EFAULT;
2802                 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
2803                                  num_msrs_to_save * sizeof(u32)))
2804                         goto out;
2805                 if (copy_to_user(user_msr_list->indices
2806                                  + num_msrs_to_save * sizeof(u32),
2807                                  &emulated_msrs,
2808                                  ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
2809                         goto out;
2810                 r = 0;
2811                 break;
2812         }
2813         case KVM_CHECK_EXTENSION:
2814                 /*
2815                  * No extensions defined at present.
2816                  */
2817                 r = 0;
2818                 break;
2819         case KVM_GET_VCPU_MMAP_SIZE:
2820                 r = -EINVAL;
2821                 if (arg)
2822                         goto out;
2823                 r = 2 * PAGE_SIZE;
2824                 break;
2825         default:
2826                 ;
2827         }
2828 out:
2829         return r;
2830 }
2831
2832 static struct file_operations kvm_chardev_ops = {
2833         .unlocked_ioctl = kvm_dev_ioctl,
2834         .compat_ioctl   = kvm_dev_ioctl,
2835 };
2836
2837 static struct miscdevice kvm_dev = {
2838         KVM_MINOR,
2839         "kvm",
2840         &kvm_chardev_ops,
2841 };
2842
2843 /*
2844  * Make sure that a cpu that is being hot-unplugged does not have any vcpus
2845  * cached on it.
2846  */
2847 static void decache_vcpus_on_cpu(int cpu)
2848 {
2849         struct kvm *vm;
2850         struct kvm_vcpu *vcpu;
2851         int i;
2852
2853         spin_lock(&kvm_lock);
2854         list_for_each_entry(vm, &vm_list, vm_list)
2855                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2856                         vcpu = vm->vcpus[i];
2857                         if (!vcpu)
2858                                 continue;
2859                         /*
2860                          * If the vcpu is locked, then it is running on some
2861                          * other cpu and therefore it is not cached on the
2862                          * cpu in question.
2863                          *
2864                          * If it's not locked, check the last cpu it executed
2865                          * on.
2866                          */
2867                         if (mutex_trylock(&vcpu->mutex)) {
2868                                 if (vcpu->cpu == cpu) {
2869                                         kvm_arch_ops->vcpu_decache(vcpu);
2870                                         vcpu->cpu = -1;
2871                                 }
2872                                 mutex_unlock(&vcpu->mutex);
2873                         }
2874                 }
2875         spin_unlock(&kvm_lock);
2876 }
2877
2878 static void hardware_enable(void *junk)
2879 {
2880         int cpu = raw_smp_processor_id();
2881
2882         if (cpu_isset(cpu, cpus_hardware_enabled))
2883                 return;
2884         cpu_set(cpu, cpus_hardware_enabled);
2885         kvm_arch_ops->hardware_enable(NULL);
2886 }
2887
2888 static void hardware_disable(void *junk)
2889 {
2890         int cpu = raw_smp_processor_id();
2891
2892         if (!cpu_isset(cpu, cpus_hardware_enabled))
2893                 return;
2894         cpu_clear(cpu, cpus_hardware_enabled);
2895         decache_vcpus_on_cpu(cpu);
2896         kvm_arch_ops->hardware_disable(NULL);
2897 }
2898
2899 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2900                            void *v)
2901 {
2902         int cpu = (long)v;
2903
2904         switch (val) {
2905         case CPU_DYING:
2906         case CPU_DYING_FROZEN:
2907                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2908                        cpu);
2909                 hardware_disable(NULL);
2910                 break;
2911         case CPU_UP_CANCELED:
2912         case CPU_UP_CANCELED_FROZEN:
2913                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2914                        cpu);
2915                 smp_call_function_single(cpu, hardware_disable, NULL, 0, 1);
2916                 break;
2917         case CPU_ONLINE:
2918         case CPU_ONLINE_FROZEN:
2919                 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2920                        cpu);
2921                 smp_call_function_single(cpu, hardware_enable, NULL, 0, 1);
2922                 break;
2923         }
2924         return NOTIFY_OK;
2925 }
2926
2927 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2928                        void *v)
2929 {
2930         if (val == SYS_RESTART) {
2931                 /*
2932                  * Some (well, at least mine) BIOSes hang on reboot if
2933                  * in vmx root mode.
2934                  */
2935                 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2936                 on_each_cpu(hardware_disable, NULL, 0, 1);
2937         }
2938         return NOTIFY_OK;
2939 }
2940
2941 static struct notifier_block kvm_reboot_notifier = {
2942         .notifier_call = kvm_reboot,
2943         .priority = 0,
2944 };
2945
2946 void kvm_io_bus_init(struct kvm_io_bus *bus)
2947 {
2948         memset(bus, 0, sizeof(*bus));
2949 }
2950
2951 void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2952 {
2953         int i;
2954
2955         for (i = 0; i < bus->dev_count; i++) {
2956                 struct kvm_io_device *pos = bus->devs[i];
2957
2958                 kvm_iodevice_destructor(pos);
2959         }
2960 }
2961
2962 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr)
2963 {
2964         int i;
2965
2966         for (i = 0; i < bus->dev_count; i++) {
2967                 struct kvm_io_device *pos = bus->devs[i];
2968
2969                 if (pos->in_range(pos, addr))
2970                         return pos;
2971         }
2972
2973         return NULL;
2974 }
2975
2976 void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
2977 {
2978         BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
2979
2980         bus->devs[bus->dev_count++] = dev;
2981 }
2982
2983 static struct notifier_block kvm_cpu_notifier = {
2984         .notifier_call = kvm_cpu_hotplug,
2985         .priority = 20, /* must be > scheduler priority */
2986 };
2987
2988 static u64 stat_get(void *_offset)
2989 {
2990         unsigned offset = (long)_offset;
2991         u64 total = 0;
2992         struct kvm *kvm;
2993         struct kvm_vcpu *vcpu;
2994         int i;
2995
2996         spin_lock(&kvm_lock);
2997         list_for_each_entry(kvm, &vm_list, vm_list)
2998                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2999                         vcpu = kvm->vcpus[i];
3000                         if (vcpu)
3001                                 total += *(u32 *)((void *)vcpu + offset);
3002                 }
3003         spin_unlock(&kvm_lock);
3004         return total;
3005 }
3006
3007 DEFINE_SIMPLE_ATTRIBUTE(stat_fops, stat_get, NULL, "%llu\n");
3008
3009 static __init void kvm_init_debug(void)
3010 {
3011         struct kvm_stats_debugfs_item *p;
3012
3013         debugfs_dir = debugfs_create_dir("kvm", NULL);
3014         for (p = debugfs_entries; p->name; ++p)
3015                 p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir,
3016                                                 (void *)(long)p->offset,
3017                                                 &stat_fops);
3018 }
3019
3020 static void kvm_exit_debug(void)
3021 {
3022         struct kvm_stats_debugfs_item *p;
3023
3024         for (p = debugfs_entries; p->name; ++p)
3025                 debugfs_remove(p->dentry);
3026         debugfs_remove(debugfs_dir);
3027 }
3028
3029 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
3030 {
3031         hardware_disable(NULL);
3032         return 0;
3033 }
3034
3035 static int kvm_resume(struct sys_device *dev)
3036 {
3037         hardware_enable(NULL);
3038         return 0;
3039 }
3040
3041 static struct sysdev_class kvm_sysdev_class = {
3042         set_kset_name("kvm"),
3043         .suspend = kvm_suspend,
3044         .resume = kvm_resume,
3045 };
3046
3047 static struct sys_device kvm_sysdev = {
3048         .id = 0,
3049         .cls = &kvm_sysdev_class,
3050 };
3051
3052 hpa_t bad_page_address;
3053
3054 static inline
3055 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
3056 {
3057         return container_of(pn, struct kvm_vcpu, preempt_notifier);
3058 }
3059
3060 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
3061 {
3062         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3063
3064         kvm_arch_ops->vcpu_load(vcpu, cpu);
3065 }
3066
3067 static void kvm_sched_out(struct preempt_notifier *pn,
3068                           struct task_struct *next)
3069 {
3070         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3071
3072         kvm_arch_ops->vcpu_put(vcpu);
3073 }
3074
3075 int kvm_init_arch(struct kvm_arch_ops *ops, unsigned int vcpu_size,
3076                   struct module *module)
3077 {
3078         int r;
3079         int cpu;
3080
3081         if (kvm_arch_ops) {
3082                 printk(KERN_ERR "kvm: already loaded the other module\n");
3083                 return -EEXIST;
3084         }
3085
3086         if (!ops->cpu_has_kvm_support()) {
3087                 printk(KERN_ERR "kvm: no hardware support\n");
3088                 return -EOPNOTSUPP;
3089         }
3090         if (ops->disabled_by_bios()) {
3091                 printk(KERN_ERR "kvm: disabled by bios\n");
3092                 return -EOPNOTSUPP;
3093         }
3094
3095         kvm_arch_ops = ops;
3096
3097         r = kvm_arch_ops->hardware_setup();
3098         if (r < 0)
3099                 goto out;
3100
3101         for_each_online_cpu(cpu) {
3102                 smp_call_function_single(cpu,
3103                                 kvm_arch_ops->check_processor_compatibility,
3104                                 &r, 0, 1);
3105                 if (r < 0)
3106                         goto out_free_0;
3107         }
3108
3109         on_each_cpu(hardware_enable, NULL, 0, 1);
3110         r = register_cpu_notifier(&kvm_cpu_notifier);
3111         if (r)
3112                 goto out_free_1;
3113         register_reboot_notifier(&kvm_reboot_notifier);
3114
3115         r = sysdev_class_register(&kvm_sysdev_class);
3116         if (r)
3117                 goto out_free_2;
3118
3119         r = sysdev_register(&kvm_sysdev);
3120         if (r)
3121                 goto out_free_3;
3122
3123         /* A kmem cache lets us meet the alignment requirements of fx_save. */
3124         kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
3125                                            __alignof__(struct kvm_vcpu), 0, 0);
3126         if (!kvm_vcpu_cache) {
3127                 r = -ENOMEM;
3128                 goto out_free_4;
3129         }
3130
3131         kvm_chardev_ops.owner = module;
3132
3133         r = misc_register(&kvm_dev);
3134         if (r) {
3135                 printk (KERN_ERR "kvm: misc device register failed\n");
3136                 goto out_free;
3137         }
3138
3139         kvm_preempt_ops.sched_in = kvm_sched_in;
3140         kvm_preempt_ops.sched_out = kvm_sched_out;
3141
3142         return r;
3143
3144 out_free:
3145         kmem_cache_destroy(kvm_vcpu_cache);
3146 out_free_4:
3147         sysdev_unregister(&kvm_sysdev);
3148 out_free_3:
3149         sysdev_class_unregister(&kvm_sysdev_class);
3150 out_free_2:
3151         unregister_reboot_notifier(&kvm_reboot_notifier);
3152         unregister_cpu_notifier(&kvm_cpu_notifier);
3153 out_free_1:
3154         on_each_cpu(hardware_disable, NULL, 0, 1);
3155 out_free_0:
3156         kvm_arch_ops->hardware_unsetup();
3157 out:
3158         kvm_arch_ops = NULL;
3159         return r;
3160 }
3161
3162 void kvm_exit_arch(void)
3163 {
3164         misc_deregister(&kvm_dev);
3165         kmem_cache_destroy(kvm_vcpu_cache);
3166         sysdev_unregister(&kvm_sysdev);
3167         sysdev_class_unregister(&kvm_sysdev_class);
3168         unregister_reboot_notifier(&kvm_reboot_notifier);
3169         unregister_cpu_notifier(&kvm_cpu_notifier);
3170         on_each_cpu(hardware_disable, NULL, 0, 1);
3171         kvm_arch_ops->hardware_unsetup();
3172         kvm_arch_ops = NULL;
3173 }
3174
3175 static __init int kvm_init(void)
3176 {
3177         static struct page *bad_page;
3178         int r;
3179
3180         r = kvm_mmu_module_init();
3181         if (r)
3182                 goto out4;
3183
3184         kvm_init_debug();
3185
3186         kvm_init_msr_list();
3187
3188         if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
3189                 r = -ENOMEM;
3190                 goto out;
3191         }
3192
3193         bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
3194         memset(__va(bad_page_address), 0, PAGE_SIZE);
3195
3196         return 0;
3197
3198 out:
3199         kvm_exit_debug();
3200         kvm_mmu_module_exit();
3201 out4:
3202         return r;
3203 }
3204
3205 static __exit void kvm_exit(void)
3206 {
3207         kvm_exit_debug();
3208         __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
3209         kvm_mmu_module_exit();
3210 }
3211
3212 module_init(kvm_init)
3213 module_exit(kvm_exit)
3214
3215 EXPORT_SYMBOL_GPL(kvm_init_arch);
3216 EXPORT_SYMBOL_GPL(kvm_exit_arch);