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
  20 #include <linux/kvm.h>
  21 #include <linux/module.h>
  22 #include <linux/errno.h>
  23 #include <asm/processor.h>
  24 #include <linux/percpu.h>
  25 #include <linux/gfp.h>
  26 #include <asm/msr.h>
  27 #include <linux/mm.h>
  28 #include <linux/miscdevice.h>
  29 #include <linux/vmalloc.h>
  30 #include <asm/uaccess.h>
  31 #include <linux/reboot.h>
  32 #include <asm/io.h>
  33 #include <linux/debugfs.h>
  34 #include <linux/highmem.h>
  35 #include <linux/file.h>
  36 #include <asm/desc.h>
  37
  38 #include "x86_emulate.h"
  39 #include "segment_descriptor.h"
  40
  41 MODULE_AUTHOR("Qumranet");
  42 MODULE_LICENSE("GPL");
  43
  44 struct kvm_arch_ops *kvm_arch_ops;
  45 struct kvm_stat kvm_stat;
  46 EXPORT_SYMBOL_GPL(kvm_stat);
  47
  48 static struct kvm_stats_debugfs_item {
  49         const char *name;
  50         u32 *data;
  51         struct dentry *dentry;
  52 } debugfs_entries[] = {
  53         { "pf_fixed", &kvm_stat.pf_fixed },
  54         { "pf_guest", &kvm_stat.pf_guest },
  55         { "tlb_flush", &kvm_stat.tlb_flush },
  56         { "invlpg", &kvm_stat.invlpg },
  57         { "exits", &kvm_stat.exits },
  58         { "io_exits", &kvm_stat.io_exits },
  59         { "mmio_exits", &kvm_stat.mmio_exits },
  60         { "signal_exits", &kvm_stat.signal_exits },
  61         { "irq_window", &kvm_stat.irq_window_exits },
  62         { "halt_exits", &kvm_stat.halt_exits },
  63         { "request_irq", &kvm_stat.request_irq_exits },
  64         { "irq_exits", &kvm_stat.irq_exits },
  65         { 0, 0 }
  66 };
  67
  68 static struct dentry *debugfs_dir;
  69
  70 #define MAX_IO_MSRS 256
  71
  72 #define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL
  73 #define LMSW_GUEST_MASK 0x0eULL
  74 #define CR4_RESEVED_BITS (~((1ULL << 11) - 1))
  75 #define CR8_RESEVED_BITS (~0x0fULL)
  76 #define EFER_RESERVED_BITS 0xfffffffffffff2fe
  77
  78 #ifdef CONFIG_X86_64
  79 // LDT or TSS descriptor in the GDT. 16 bytes.
  80 struct segment_descriptor_64 {
  81         struct segment_descriptor s;
  82         u32 base_higher;
  83         u32 pad_zero;
  84 };
  85
  86 #endif
  87
  88 unsigned long segment_base(u16 selector)
  89 {
  90         struct descriptor_table gdt;
  91         struct segment_descriptor *d;
  92         unsigned long table_base;
  93         typedef unsigned long ul;
  94         unsigned long v;
  95
  96         if (selector == 0)
  97                 return 0;
  98
  99         asm ("sgdt %0" : "=m"(gdt));
 100         table_base = gdt.base;
 101
 102         if (selector & 4) {           /* from ldt */
 103                 u16 ldt_selector;
 104
 105                 asm ("sldt %0" : "=g"(ldt_selector));
 106                 table_base = segment_base(ldt_selector);
 107         }
 108         d = (struct segment_descriptor *)(table_base + (selector & ~7));
 109         v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
 110 #ifdef CONFIG_X86_64
 111         if (d->system == 0
 112             && (d->type == 2 || d->type == 9 || d->type == 11))
 113                 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
 114 #endif
 115         return v;
 116 }
 117 EXPORT_SYMBOL_GPL(segment_base);
 118
 119 static inline int valid_vcpu(int n)
 120 {
 121         return likely(n >= 0 && n < KVM_MAX_VCPUS);
 122 }
 123
 124 int kvm_read_guest(struct kvm_vcpu *vcpu,
 125                              gva_t addr,
 126                              unsigned long size,
 127                              void *dest)
 128 {
 129         unsigned char *host_buf = dest;
 130         unsigned long req_size = size;
 131
 132         while (size) {
 133                 hpa_t paddr;
 134                 unsigned now;
 135                 unsigned offset;
 136                 hva_t guest_buf;
 137
 138                 paddr = gva_to_hpa(vcpu, addr);
 139
 140                 if (is_error_hpa(paddr))
 141                         break;
 142
 143                 guest_buf = (hva_t)kmap_atomic(
 144                                         pfn_to_page(paddr >> PAGE_SHIFT),
 145                                         KM_USER0);
 146                 offset = addr & ~PAGE_MASK;
 147                 guest_buf |= offset;
 148                 now = min(size, PAGE_SIZE - offset);
 149                 memcpy(host_buf, (void*)guest_buf, now);
 150                 host_buf += now;
 151                 addr += now;
 152                 size -= now;
 153                 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
 154         }
 155         return req_size - size;
 156 }
 157 EXPORT_SYMBOL_GPL(kvm_read_guest);
 158
 159 int kvm_write_guest(struct kvm_vcpu *vcpu,
 160                              gva_t addr,
 161                              unsigned long size,
 162                              void *data)
 163 {
 164         unsigned char *host_buf = data;
 165         unsigned long req_size = size;
 166
 167         while (size) {
 168                 hpa_t paddr;
 169                 unsigned now;
 170                 unsigned offset;
 171                 hva_t guest_buf;
 172
 173                 paddr = gva_to_hpa(vcpu, addr);
 174
 175                 if (is_error_hpa(paddr))
 176                         break;
 177
 178                 guest_buf = (hva_t)kmap_atomic(
 179                                 pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0);
 180                 offset = addr & ~PAGE_MASK;
 181                 guest_buf |= offset;
 182                 now = min(size, PAGE_SIZE - offset);
 183                 memcpy((void*)guest_buf, host_buf, now);
 184                 host_buf += now;
 185                 addr += now;
 186                 size -= now;
 187                 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
 188         }
 189         return req_size - size;
 190 }
 191 EXPORT_SYMBOL_GPL(kvm_write_guest);
 192
 193 static int vcpu_slot(struct kvm_vcpu *vcpu)
 194 {
 195         return vcpu - vcpu->kvm->vcpus;
 196 }
 197
 198 /*
 199  * Switches to specified vcpu, until a matching vcpu_put()
 200  */
 201 static struct kvm_vcpu *vcpu_load(struct kvm *kvm, int vcpu_slot)
 202 {
 203         struct kvm_vcpu *vcpu = &kvm->vcpus[vcpu_slot];
 204
 205         mutex_lock(&vcpu->mutex);
 206         if (unlikely(!vcpu->vmcs)) {
 207                 mutex_unlock(&vcpu->mutex);
 208                 return 0;
 209         }
 210         return kvm_arch_ops->vcpu_load(vcpu);
 211 }
 212
 213 static void vcpu_put(struct kvm_vcpu *vcpu)
 214 {
 215         kvm_arch_ops->vcpu_put(vcpu);
 216         mutex_unlock(&vcpu->mutex);
 217 }
 218
 219 static int kvm_dev_open(struct inode *inode, struct file *filp)
 220 {
 221         struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
 222         int i;
 223
 224         if (!kvm)
 225                 return -ENOMEM;
 226
 227         spin_lock_init(&kvm->lock);
 228         INIT_LIST_HEAD(&kvm->active_mmu_pages);
 229         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 230                 struct kvm_vcpu *vcpu = &kvm->vcpus[i];
 231
 232                 mutex_init(&vcpu->mutex);
 233                 vcpu->mmu.root_hpa = INVALID_PAGE;
 234                 INIT_LIST_HEAD(&vcpu->free_pages);
 235         }
 236         filp->private_data = kvm;
 237         return 0;
 238 }
 239
 240 /*
 241  * Free any memory in @free but not in @dont.
 242  */
 243 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
 244                                   struct kvm_memory_slot *dont)
 245 {
 246         int i;
 247
 248         if (!dont || free->phys_mem != dont->phys_mem)
 249                 if (free->phys_mem) {
 250                         for (i = 0; i < free->npages; ++i)
 251                                 if (free->phys_mem[i])
 252                                         __free_page(free->phys_mem[i]);
 253                         vfree(free->phys_mem);
 254                 }
 255
 256         if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
 257                 vfree(free->dirty_bitmap);
 258
 259         free->phys_mem = 0;
 260         free->npages = 0;
 261         free->dirty_bitmap = 0;
 262 }
 263
 264 static void kvm_free_physmem(struct kvm *kvm)
 265 {
 266         int i;
 267
 268         for (i = 0; i < kvm->nmemslots; ++i)
 269                 kvm_free_physmem_slot(&kvm->memslots[i], 0);
 270 }
 271
 272 static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
 273 {
 274         kvm_arch_ops->vcpu_free(vcpu);
 275         kvm_mmu_destroy(vcpu);
 276 }
 277
 278 static void kvm_free_vcpus(struct kvm *kvm)
 279 {
 280         unsigned int i;
 281
 282         for (i = 0; i < KVM_MAX_VCPUS; ++i)
 283                 kvm_free_vcpu(&kvm->vcpus[i]);
 284 }
 285
 286 static int kvm_dev_release(struct inode *inode, struct file *filp)
 287 {
 288         struct kvm *kvm = filp->private_data;
 289
 290         kvm_free_vcpus(kvm);
 291         kvm_free_physmem(kvm);
 292         kfree(kvm);
 293         return 0;
 294 }
 295
 296 static void inject_gp(struct kvm_vcpu *vcpu)
 297 {
 298         kvm_arch_ops->inject_gp(vcpu, 0);
 299 }
 300
 301 /*
 302  * Load the pae pdptrs.  Return true is they are all valid.
 303  */
 304 static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
 305 {
 306         gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
 307         unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
 308         int i;
 309         u64 pdpte;
 310         u64 *pdpt;
 311         int ret;
 312         struct kvm_memory_slot *memslot;
 313
 314         spin_lock(&vcpu->kvm->lock);
 315         memslot = gfn_to_memslot(vcpu->kvm, pdpt_gfn);
 316         /* FIXME: !memslot - emulate? 0xff? */
 317         pdpt = kmap_atomic(gfn_to_page(memslot, pdpt_gfn), KM_USER0);
 318
 319         ret = 1;
 320         for (i = 0; i < 4; ++i) {
 321                 pdpte = pdpt[offset + i];
 322                 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) {
 323                         ret = 0;
 324                         goto out;
 325                 }
 326         }
 327
 328         for (i = 0; i < 4; ++i)
 329                 vcpu->pdptrs[i] = pdpt[offset + i];
 330
 331 out:
 332         kunmap_atomic(pdpt, KM_USER0);
 333         spin_unlock(&vcpu->kvm->lock);
 334
 335         return ret;
 336 }
 337
 338 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 339 {
 340         if (cr0 & CR0_RESEVED_BITS) {
 341                 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
 342                        cr0, vcpu->cr0);
 343                 inject_gp(vcpu);
 344                 return;
 345         }
 346
 347         if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
 348                 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
 349                 inject_gp(vcpu);
 350                 return;
 351         }
 352
 353         if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
 354                 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
 355                        "and a clear PE flag\n");
 356                 inject_gp(vcpu);
 357                 return;
 358         }
 359
 360         if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
 361 #ifdef CONFIG_X86_64
 362                 if ((vcpu->shadow_efer & EFER_LME)) {
 363                         int cs_db, cs_l;
 364
 365                         if (!is_pae(vcpu)) {
 366                                 printk(KERN_DEBUG "set_cr0: #GP, start paging "
 367                                        "in long mode while PAE is disabled\n");
 368                                 inject_gp(vcpu);
 369                                 return;
 370                         }
 371                         kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
 372                         if (cs_l) {
 373                                 printk(KERN_DEBUG "set_cr0: #GP, start paging "
 374                                        "in long mode while CS.L == 1\n");
 375                                 inject_gp(vcpu);
 376                                 return;
 377
 378                         }
 379                 } else
 380 #endif
 381                 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
 382                         printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
 383                                "reserved bits\n");
 384                         inject_gp(vcpu);
 385                         return;
 386                 }
 387
 388         }
 389
 390         kvm_arch_ops->set_cr0(vcpu, cr0);
 391         vcpu->cr0 = cr0;
 392
 393         spin_lock(&vcpu->kvm->lock);
 394         kvm_mmu_reset_context(vcpu);
 395         spin_unlock(&vcpu->kvm->lock);
 396         return;
 397 }
 398 EXPORT_SYMBOL_GPL(set_cr0);
 399
 400 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
 401 {
 402         kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
 403         set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
 404 }
 405 EXPORT_SYMBOL_GPL(lmsw);
 406
 407 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
 408 {
 409         if (cr4 & CR4_RESEVED_BITS) {
 410                 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
 411                 inject_gp(vcpu);
 412                 return;
 413         }
 414
 415         if (is_long_mode(vcpu)) {
 416                 if (!(cr4 & CR4_PAE_MASK)) {
 417                         printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
 418                                "in long mode\n");
 419                         inject_gp(vcpu);
 420                         return;
 421                 }
 422         } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
 423                    && !load_pdptrs(vcpu, vcpu->cr3)) {
 424                 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
 425                 inject_gp(vcpu);
 426         }
 427
 428         if (cr4 & CR4_VMXE_MASK) {
 429                 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
 430                 inject_gp(vcpu);
 431                 return;
 432         }
 433         kvm_arch_ops->set_cr4(vcpu, cr4);
 434         spin_lock(&vcpu->kvm->lock);
 435         kvm_mmu_reset_context(vcpu);
 436         spin_unlock(&vcpu->kvm->lock);
 437 }
 438 EXPORT_SYMBOL_GPL(set_cr4);
 439
 440 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
 441 {
 442         if (is_long_mode(vcpu)) {
 443                 if ( cr3 & CR3_L_MODE_RESEVED_BITS) {
 444                         printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
 445                         inject_gp(vcpu);
 446                         return;
 447                 }
 448         } else {
 449                 if (cr3 & CR3_RESEVED_BITS) {
 450                         printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
 451                         inject_gp(vcpu);
 452                         return;
 453                 }
 454                 if (is_paging(vcpu) && is_pae(vcpu) &&
 455                     !load_pdptrs(vcpu, cr3)) {
 456                         printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
 457                                "reserved bits\n");
 458                         inject_gp(vcpu);
 459                         return;
 460                 }
 461         }
 462
 463         vcpu->cr3 = cr3;
 464         spin_lock(&vcpu->kvm->lock);
 465         vcpu->mmu.new_cr3(vcpu);
 466         spin_unlock(&vcpu->kvm->lock);
 467 }
 468 EXPORT_SYMBOL_GPL(set_cr3);
 469
 470 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
 471 {
 472         if ( cr8 & CR8_RESEVED_BITS) {
 473                 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
 474                 inject_gp(vcpu);
 475                 return;
 476         }
 477         vcpu->cr8 = cr8;
 478 }
 479 EXPORT_SYMBOL_GPL(set_cr8);
 480
 481 void fx_init(struct kvm_vcpu *vcpu)
 482 {
 483         struct __attribute__ ((__packed__)) fx_image_s {
 484                 u16 control; //fcw
 485                 u16 status; //fsw
 486                 u16 tag; // ftw
 487                 u16 opcode; //fop
 488                 u64 ip; // fpu ip
 489                 u64 operand;// fpu dp
 490                 u32 mxcsr;
 491                 u32 mxcsr_mask;
 492
 493         } *fx_image;
 494
 495         fx_save(vcpu->host_fx_image);
 496         fpu_init();
 497         fx_save(vcpu->guest_fx_image);
 498         fx_restore(vcpu->host_fx_image);
 499
 500         fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
 501         fx_image->mxcsr = 0x1f80;
 502         memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
 503                0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
 504 }
 505 EXPORT_SYMBOL_GPL(fx_init);
 506
 507 /*
 508  * Creates some virtual cpus.  Good luck creating more than one.
 509  */
 510 static int kvm_dev_ioctl_create_vcpu(struct kvm *kvm, int n)
 511 {
 512         int r;
 513         struct kvm_vcpu *vcpu;
 514
 515         r = -EINVAL;
 516         if (!valid_vcpu(n))
 517                 goto out;
 518
 519         vcpu = &kvm->vcpus[n];
 520
 521         mutex_lock(&vcpu->mutex);
 522
 523         if (vcpu->vmcs) {
 524                 mutex_unlock(&vcpu->mutex);
 525                 return -EEXIST;
 526         }
 527
 528         vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
 529                                            FX_IMAGE_ALIGN);
 530         vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
 531
 532         vcpu->cpu = -1;  /* First load will set up TR */
 533         vcpu->kvm = kvm;
 534         r = kvm_arch_ops->vcpu_create(vcpu);
 535         if (r < 0)
 536                 goto out_free_vcpus;
 537
 538         r = kvm_mmu_create(vcpu);
 539         if (r < 0)
 540                 goto out_free_vcpus;
 541
 542         kvm_arch_ops->vcpu_load(vcpu);
 543         r = kvm_mmu_setup(vcpu);
 544         if (r >= 0)
 545                 r = kvm_arch_ops->vcpu_setup(vcpu);
 546         vcpu_put(vcpu);
 547
 548         if (r < 0)
 549                 goto out_free_vcpus;
 550
 551         return 0;
 552
 553 out_free_vcpus:
 554         kvm_free_vcpu(vcpu);
 555         mutex_unlock(&vcpu->mutex);
 556 out:
 557         return r;
 558 }
 559
 560 /*
 561  * Allocate some memory and give it an address in the guest physical address
 562  * space.
 563  *
 564  * Discontiguous memory is allowed, mostly for framebuffers.
 565  */
 566 static int kvm_dev_ioctl_set_memory_region(struct kvm *kvm,
 567                                            struct kvm_memory_region *mem)
 568 {
 569         int r;
 570         gfn_t base_gfn;
 571         unsigned long npages;
 572         unsigned long i;
 573         struct kvm_memory_slot *memslot;
 574         struct kvm_memory_slot old, new;
 575         int memory_config_version;
 576
 577         r = -EINVAL;
 578         /* General sanity checks */
 579         if (mem->memory_size & (PAGE_SIZE - 1))
 580                 goto out;
 581         if (mem->guest_phys_addr & (PAGE_SIZE - 1))
 582                 goto out;
 583         if (mem->slot >= KVM_MEMORY_SLOTS)
 584                 goto out;
 585         if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
 586                 goto out;
 587
 588         memslot = &kvm->memslots[mem->slot];
 589         base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
 590         npages = mem->memory_size >> PAGE_SHIFT;
 591
 592         if (!npages)
 593                 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
 594
 595 raced:
 596         spin_lock(&kvm->lock);
 597
 598         memory_config_version = kvm->memory_config_version;
 599         new = old = *memslot;
 600
 601         new.base_gfn = base_gfn;
 602         new.npages = npages;
 603         new.flags = mem->flags;
 604
 605         /* Disallow changing a memory slot's size. */
 606         r = -EINVAL;
 607         if (npages && old.npages && npages != old.npages)
 608                 goto out_unlock;
 609
 610         /* Check for overlaps */
 611         r = -EEXIST;
 612         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
 613                 struct kvm_memory_slot *s = &kvm->memslots[i];
 614
 615                 if (s == memslot)
 616                         continue;
 617                 if (!((base_gfn + npages <= s->base_gfn) ||
 618                       (base_gfn >= s->base_gfn + s->npages)))
 619                         goto out_unlock;
 620         }
 621         /*
 622          * Do memory allocations outside lock.  memory_config_version will
 623          * detect any races.
 624          */
 625         spin_unlock(&kvm->lock);
 626
 627         /* Deallocate if slot is being removed */
 628         if (!npages)
 629                 new.phys_mem = 0;
 630
 631         /* Free page dirty bitmap if unneeded */
 632         if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
 633                 new.dirty_bitmap = 0;
 634
 635         r = -ENOMEM;
 636
 637         /* Allocate if a slot is being created */
 638         if (npages && !new.phys_mem) {
 639                 new.phys_mem = vmalloc(npages * sizeof(struct page *));
 640
 641                 if (!new.phys_mem)
 642                         goto out_free;
 643
 644                 memset(new.phys_mem, 0, npages * sizeof(struct page *));
 645                 for (i = 0; i < npages; ++i) {
 646                         new.phys_mem[i] = alloc_page(GFP_HIGHUSER
 647                                                      | __GFP_ZERO);
 648                         if (!new.phys_mem[i])
 649                                 goto out_free;
 650                         new.phys_mem[i]->private = 0;
 651                 }
 652         }
 653
 654         /* Allocate page dirty bitmap if needed */
 655         if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
 656                 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
 657
 658                 new.dirty_bitmap = vmalloc(dirty_bytes);
 659                 if (!new.dirty_bitmap)
 660                         goto out_free;
 661                 memset(new.dirty_bitmap, 0, dirty_bytes);
 662         }
 663
 664         spin_lock(&kvm->lock);
 665
 666         if (memory_config_version != kvm->memory_config_version) {
 667                 spin_unlock(&kvm->lock);
 668                 kvm_free_physmem_slot(&new, &old);
 669                 goto raced;
 670         }
 671
 672         r = -EAGAIN;
 673         if (kvm->busy)
 674                 goto out_unlock;
 675
 676         if (mem->slot >= kvm->nmemslots)
 677                 kvm->nmemslots = mem->slot + 1;
 678
 679         *memslot = new;
 680         ++kvm->memory_config_version;
 681
 682         spin_unlock(&kvm->lock);
 683
 684         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 685                 struct kvm_vcpu *vcpu;
 686
 687                 vcpu = vcpu_load(kvm, i);
 688                 if (!vcpu)
 689                         continue;
 690                 kvm_mmu_reset_context(vcpu);
 691                 vcpu_put(vcpu);
 692         }
 693
 694         kvm_free_physmem_slot(&old, &new);
 695         return 0;
 696
 697 out_unlock:
 698         spin_unlock(&kvm->lock);
 699 out_free:
 700         kvm_free_physmem_slot(&new, &old);
 701 out:
 702         return r;
 703 }
 704
 705 /*
 706  * Get (and clear) the dirty memory log for a memory slot.
 707  */
 708 static int kvm_dev_ioctl_get_dirty_log(struct kvm *kvm,
 709                                        struct kvm_dirty_log *log)
 710 {
 711         struct kvm_memory_slot *memslot;
 712         int r, i;
 713         int n;
 714         unsigned long any = 0;
 715
 716         spin_lock(&kvm->lock);
 717
 718         /*
 719          * Prevent changes to guest memory configuration even while the lock
 720          * is not taken.
 721          */
 722         ++kvm->busy;
 723         spin_unlock(&kvm->lock);
 724         r = -EINVAL;
 725         if (log->slot >= KVM_MEMORY_SLOTS)
 726                 goto out;
 727
 728         memslot = &kvm->memslots[log->slot];
 729         r = -ENOENT;
 730         if (!memslot->dirty_bitmap)
 731                 goto out;
 732
 733         n = ALIGN(memslot->npages, 8) / 8;
 734
 735         for (i = 0; !any && i < n; ++i)
 736                 any = memslot->dirty_bitmap[i];
 737
 738         r = -EFAULT;
 739         if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
 740                 goto out;
 741
 742
 743         if (any) {
 744                 spin_lock(&kvm->lock);
 745                 kvm_mmu_slot_remove_write_access(kvm, log->slot);
 746                 spin_unlock(&kvm->lock);
 747                 memset(memslot->dirty_bitmap, 0, n);
 748                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 749                         struct kvm_vcpu *vcpu = vcpu_load(kvm, i);
 750
 751                         if (!vcpu)
 752                                 continue;
 753                         kvm_arch_ops->tlb_flush(vcpu);
 754                         vcpu_put(vcpu);
 755                 }
 756         }
 757
 758         r = 0;
 759
 760 out:
 761         spin_lock(&kvm->lock);
 762         --kvm->busy;
 763         spin_unlock(&kvm->lock);
 764         return r;
 765 }
 766
 767 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
 768 {
 769         int i;
 770
 771         for (i = 0; i < kvm->nmemslots; ++i) {
 772                 struct kvm_memory_slot *memslot = &kvm->memslots[i];
 773
 774                 if (gfn >= memslot->base_gfn
 775                     && gfn < memslot->base_gfn + memslot->npages)
 776                         return memslot;
 777         }
 778         return 0;
 779 }
 780 EXPORT_SYMBOL_GPL(gfn_to_memslot);
 781
 782 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
 783 {
 784         int i;
 785         struct kvm_memory_slot *memslot = 0;
 786         unsigned long rel_gfn;
 787
 788         for (i = 0; i < kvm->nmemslots; ++i) {
 789                 memslot = &kvm->memslots[i];
 790
 791                 if (gfn >= memslot->base_gfn
 792                     && gfn < memslot->base_gfn + memslot->npages) {
 793
 794                         if (!memslot || !memslot->dirty_bitmap)
 795                                 return;
 796
 797                         rel_gfn = gfn - memslot->base_gfn;
 798
 799                         /* avoid RMW */
 800                         if (!test_bit(rel_gfn, memslot->dirty_bitmap))
 801                                 set_bit(rel_gfn, memslot->dirty_bitmap);
 802                         return;
 803                 }
 804         }
 805 }
 806
 807 static int emulator_read_std(unsigned long addr,
 808                              unsigned long *val,
 809                              unsigned int bytes,
 810                              struct x86_emulate_ctxt *ctxt)
 811 {
 812         struct kvm_vcpu *vcpu = ctxt->vcpu;
 813         void *data = val;
 814
 815         while (bytes) {
 816                 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
 817                 unsigned offset = addr & (PAGE_SIZE-1);
 818                 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
 819                 unsigned long pfn;
 820                 struct kvm_memory_slot *memslot;
 821                 void *page;
 822
 823                 if (gpa == UNMAPPED_GVA)
 824                         return X86EMUL_PROPAGATE_FAULT;
 825                 pfn = gpa >> PAGE_SHIFT;
 826                 memslot = gfn_to_memslot(vcpu->kvm, pfn);
 827                 if (!memslot)
 828                         return X86EMUL_UNHANDLEABLE;
 829                 page = kmap_atomic(gfn_to_page(memslot, pfn), KM_USER0);
 830
 831                 memcpy(data, page + offset, tocopy);
 832
 833                 kunmap_atomic(page, KM_USER0);
 834
 835                 bytes -= tocopy;
 836                 data += tocopy;
 837                 addr += tocopy;
 838         }
 839
 840         return X86EMUL_CONTINUE;
 841 }
 842
 843 static int emulator_write_std(unsigned long addr,
 844                               unsigned long val,
 845                               unsigned int bytes,
 846                               struct x86_emulate_ctxt *ctxt)
 847 {
 848         printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
 849                addr, bytes);
 850         return X86EMUL_UNHANDLEABLE;
 851 }
 852
 853 static int emulator_read_emulated(unsigned long addr,
 854                                   unsigned long *val,
 855                                   unsigned int bytes,
 856                                   struct x86_emulate_ctxt *ctxt)
 857 {
 858         struct kvm_vcpu *vcpu = ctxt->vcpu;
 859
 860         if (vcpu->mmio_read_completed) {
 861                 memcpy(val, vcpu->mmio_data, bytes);
 862                 vcpu->mmio_read_completed = 0;
 863                 return X86EMUL_CONTINUE;
 864         } else if (emulator_read_std(addr, val, bytes, ctxt)
 865                    == X86EMUL_CONTINUE)
 866                 return X86EMUL_CONTINUE;
 867         else {
 868                 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
 869                 if (gpa == UNMAPPED_GVA)
 870                         return vcpu_printf(vcpu, "not present\n"), X86EMUL_PROPAGATE_FAULT;
 871                 vcpu->mmio_needed = 1;
 872                 vcpu->mmio_phys_addr = gpa;
 873                 vcpu->mmio_size = bytes;
 874                 vcpu->mmio_is_write = 0;
 875
 876                 return X86EMUL_UNHANDLEABLE;
 877         }
 878 }
 879
 880 static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
 881                                unsigned long val, int bytes)
 882 {
 883         struct kvm_memory_slot *m;
 884         struct page *page;
 885         void *virt;
 886
 887         if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
 888                 return 0;
 889         m = gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT);
 890         if (!m)
 891                 return 0;
 892         page = gfn_to_page(m, gpa >> PAGE_SHIFT);
 893         kvm_mmu_pre_write(vcpu, gpa, bytes);
 894         virt = kmap_atomic(page, KM_USER0);
 895         memcpy(virt + offset_in_page(gpa), &val, bytes);
 896         kunmap_atomic(virt, KM_USER0);
 897         kvm_mmu_post_write(vcpu, gpa, bytes);
 898         return 1;
 899 }
 900
 901 static int emulator_write_emulated(unsigned long addr,
 902                                    unsigned long val,
 903                                    unsigned int bytes,
 904                                    struct x86_emulate_ctxt *ctxt)
 905 {
 906         struct kvm_vcpu *vcpu = ctxt->vcpu;
 907         gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
 908
 909         if (gpa == UNMAPPED_GVA)
 910                 return X86EMUL_PROPAGATE_FAULT;
 911
 912         if (emulator_write_phys(vcpu, gpa, val, bytes))
 913                 return X86EMUL_CONTINUE;
 914
 915         vcpu->mmio_needed = 1;
 916         vcpu->mmio_phys_addr = gpa;
 917         vcpu->mmio_size = bytes;
 918         vcpu->mmio_is_write = 1;
 919         memcpy(vcpu->mmio_data, &val, bytes);
 920
 921         return X86EMUL_CONTINUE;
 922 }
 923
 924 static int emulator_cmpxchg_emulated(unsigned long addr,
 925                                      unsigned long old,
 926                                      unsigned long new,
 927                                      unsigned int bytes,
 928                                      struct x86_emulate_ctxt *ctxt)
 929 {
 930         static int reported;
 931
 932         if (!reported) {
 933                 reported = 1;
 934                 printk(KERN_WARNING "kvm: emulating exchange as write\n");
 935         }
 936         return emulator_write_emulated(addr, new, bytes, ctxt);
 937 }
 938
 939 #ifdef CONFIG_X86_32
 940
 941 static int emulator_cmpxchg8b_emulated(unsigned long addr,
 942                                        unsigned long old_lo,
 943                                        unsigned long old_hi,
 944                                        unsigned long new_lo,
 945                                        unsigned long new_hi,
 946                                        struct x86_emulate_ctxt *ctxt)
 947 {
 948         static int reported;
 949         int r;
 950
 951         if (!reported) {
 952                 reported = 1;
 953                 printk(KERN_WARNING "kvm: emulating exchange8b as write\n");
 954         }
 955         r = emulator_write_emulated(addr, new_lo, 4, ctxt);
 956         if (r != X86EMUL_CONTINUE)
 957                 return r;
 958         return emulator_write_emulated(addr+4, new_hi, 4, ctxt);
 959 }
 960
 961 #endif
 962
 963 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
 964 {
 965         return kvm_arch_ops->get_segment_base(vcpu, seg);
 966 }
 967
 968 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
 969 {
 970         return X86EMUL_CONTINUE;
 971 }
 972
 973 int emulate_clts(struct kvm_vcpu *vcpu)
 974 {
 975         unsigned long cr0;
 976
 977         kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
 978         cr0 = vcpu->cr0 & ~CR0_TS_MASK;
 979         kvm_arch_ops->set_cr0(vcpu, cr0);
 980         return X86EMUL_CONTINUE;
 981 }
 982
 983 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
 984 {
 985         struct kvm_vcpu *vcpu = ctxt->vcpu;
 986
 987         switch (dr) {
 988         case 0 ... 3:
 989                 *dest = kvm_arch_ops->get_dr(vcpu, dr);
 990                 return X86EMUL_CONTINUE;
 991         default:
 992                 printk(KERN_DEBUG "%s: unexpected dr %u\n",
 993                        __FUNCTION__, dr);
 994                 return X86EMUL_UNHANDLEABLE;
 995         }
 996 }
 997
 998 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
 999 {
1000         unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1001         int exception;
1002
1003         kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1004         if (exception) {
1005                 /* FIXME: better handling */
1006                 return X86EMUL_UNHANDLEABLE;
1007         }
1008         return X86EMUL_CONTINUE;
1009 }
1010
1011 static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1012 {
1013         static int reported;
1014         u8 opcodes[4];
1015         unsigned long rip = ctxt->vcpu->rip;
1016         unsigned long rip_linear;
1017
1018         rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1019
1020         if (reported)
1021                 return;
1022
1023         emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
1024
1025         printk(KERN_ERR "emulation failed but !mmio_needed?"
1026                " rip %lx %02x %02x %02x %02x\n",
1027                rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1028         reported = 1;
1029 }
1030
1031 struct x86_emulate_ops emulate_ops = {
1032         .read_std            = emulator_read_std,
1033         .write_std           = emulator_write_std,
1034         .read_emulated       = emulator_read_emulated,
1035         .write_emulated      = emulator_write_emulated,
1036         .cmpxchg_emulated    = emulator_cmpxchg_emulated,
1037 #ifdef CONFIG_X86_32
1038         .cmpxchg8b_emulated  = emulator_cmpxchg8b_emulated,
1039 #endif
1040 };
1041
1042 int emulate_instruction(struct kvm_vcpu *vcpu,
1043                         struct kvm_run *run,
1044                         unsigned long cr2,
1045                         u16 error_code)
1046 {
1047         struct x86_emulate_ctxt emulate_ctxt;
1048         int r;
1049         int cs_db, cs_l;
1050
1051         kvm_arch_ops->cache_regs(vcpu);
1052
1053         kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1054
1055         emulate_ctxt.vcpu = vcpu;
1056         emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1057         emulate_ctxt.cr2 = cr2;
1058         emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1059                 ? X86EMUL_MODE_REAL : cs_l
1060                 ? X86EMUL_MODE_PROT64 : cs_db
1061                 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1062
1063         if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1064                 emulate_ctxt.cs_base = 0;
1065                 emulate_ctxt.ds_base = 0;
1066                 emulate_ctxt.es_base = 0;
1067                 emulate_ctxt.ss_base = 0;
1068         } else {
1069                 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1070                 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1071                 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1072                 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1073         }
1074
1075         emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1076         emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1077
1078         vcpu->mmio_is_write = 0;
1079         r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1080
1081         if ((r || vcpu->mmio_is_write) && run) {
1082                 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1083                 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1084                 run->mmio.len = vcpu->mmio_size;
1085                 run->mmio.is_write = vcpu->mmio_is_write;
1086         }
1087
1088         if (r) {
1089                 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1090                         return EMULATE_DONE;
1091                 if (!vcpu->mmio_needed) {
1092                         report_emulation_failure(&emulate_ctxt);
1093                         return EMULATE_FAIL;
1094                 }
1095                 return EMULATE_DO_MMIO;
1096         }
1097
1098         kvm_arch_ops->decache_regs(vcpu);
1099         kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1100
1101         if (vcpu->mmio_is_write)
1102                 return EMULATE_DO_MMIO;
1103
1104         return EMULATE_DONE;
1105 }
1106 EXPORT_SYMBOL_GPL(emulate_instruction);
1107
1108 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1109 {
1110         return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1111 }
1112
1113 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1114 {
1115         struct descriptor_table dt = { limit, base };
1116
1117         kvm_arch_ops->set_gdt(vcpu, &dt);
1118 }
1119
1120 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1121 {
1122         struct descriptor_table dt = { limit, base };
1123
1124         kvm_arch_ops->set_idt(vcpu, &dt);
1125 }
1126
1127 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1128                    unsigned long *rflags)
1129 {
1130         lmsw(vcpu, msw);
1131         *rflags = kvm_arch_ops->get_rflags(vcpu);
1132 }
1133
1134 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1135 {
1136         kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1137         switch (cr) {
1138         case 0:
1139                 return vcpu->cr0;
1140         case 2:
1141                 return vcpu->cr2;
1142         case 3:
1143                 return vcpu->cr3;
1144         case 4:
1145                 return vcpu->cr4;
1146         default:
1147                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1148                 return 0;
1149         }
1150 }
1151
1152 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1153                      unsigned long *rflags)
1154 {
1155         switch (cr) {
1156         case 0:
1157                 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1158                 *rflags = kvm_arch_ops->get_rflags(vcpu);
1159                 break;
1160         case 2:
1161                 vcpu->cr2 = val;
1162                 break;
1163         case 3:
1164                 set_cr3(vcpu, val);
1165                 break;
1166         case 4:
1167                 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1168                 break;
1169         default:
1170                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1171         }
1172 }
1173
1174 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1175 {
1176         u64 data;
1177
1178         switch (msr) {
1179         case 0xc0010010: /* SYSCFG */
1180         case 0xc0010015: /* HWCR */
1181         case MSR_IA32_PLATFORM_ID:
1182         case MSR_IA32_P5_MC_ADDR:
1183         case MSR_IA32_P5_MC_TYPE:
1184         case MSR_IA32_MC0_CTL:
1185         case MSR_IA32_MCG_STATUS:
1186         case MSR_IA32_MCG_CAP:
1187         case MSR_IA32_MC0_MISC:
1188         case MSR_IA32_MC0_MISC+4:
1189         case MSR_IA32_MC0_MISC+8:
1190         case MSR_IA32_MC0_MISC+12:
1191         case MSR_IA32_MC0_MISC+16:
1192         case MSR_IA32_UCODE_REV:
1193         case MSR_IA32_PERF_STATUS:
1194                 /* MTRR registers */
1195         case 0xfe:
1196         case 0x200 ... 0x2ff:
1197                 data = 0;
1198                 break;
1199         case 0xcd: /* fsb frequency */
1200                 data = 3;
1201                 break;
1202         case MSR_IA32_APICBASE:
1203                 data = vcpu->apic_base;
1204                 break;
1205 #ifdef CONFIG_X86_64
1206         case MSR_EFER:
1207                 data = vcpu->shadow_efer;
1208                 break;
1209 #endif
1210         default:
1211                 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1212                 return 1;
1213         }
1214         *pdata = data;
1215         return 0;
1216 }
1217 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1218
1219 /*
1220  * Reads an msr value (of 'msr_index') into 'pdata'.
1221  * Returns 0 on success, non-0 otherwise.
1222  * Assumes vcpu_load() was already called.
1223  */
1224 static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1225 {
1226         return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1227 }
1228
1229 #ifdef CONFIG_X86_64
1230
1231 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
1232 {
1233         if (efer & EFER_RESERVED_BITS) {
1234                 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1235                        efer);
1236                 inject_gp(vcpu);
1237                 return;
1238         }
1239
1240         if (is_paging(vcpu)
1241             && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1242                 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1243                 inject_gp(vcpu);
1244                 return;
1245         }
1246
1247         kvm_arch_ops->set_efer(vcpu, efer);
1248
1249         efer &= ~EFER_LMA;
1250         efer |= vcpu->shadow_efer & EFER_LMA;
1251
1252         vcpu->shadow_efer = efer;
1253 }
1254
1255 #endif
1256
1257 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1258 {
1259         switch (msr) {
1260 #ifdef CONFIG_X86_64
1261         case MSR_EFER:
1262                 set_efer(vcpu, data);
1263                 break;
1264 #endif
1265         case MSR_IA32_MC0_STATUS:
1266                 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1267                        __FUNCTION__, data);
1268                 break;
1269         case MSR_IA32_UCODE_REV:
1270         case MSR_IA32_UCODE_WRITE:
1271         case 0x200 ... 0x2ff: /* MTRRs */
1272                 break;
1273         case MSR_IA32_APICBASE:
1274                 vcpu->apic_base = data;
1275                 break;
1276         default:
1277                 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1278                 return 1;
1279         }
1280         return 0;
1281 }
1282 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1283
1284 /*
1285  * Writes msr value into into the appropriate "register".
1286  * Returns 0 on success, non-0 otherwise.
1287  * Assumes vcpu_load() was already called.
1288  */
1289 static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1290 {
1291         return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1292 }
1293
1294 void kvm_resched(struct kvm_vcpu *vcpu)
1295 {
1296         vcpu_put(vcpu);
1297         cond_resched();
1298         /* Cannot fail -  no vcpu unplug yet. */
1299         vcpu_load(vcpu->kvm, vcpu_slot(vcpu));
1300 }
1301 EXPORT_SYMBOL_GPL(kvm_resched);
1302
1303 void load_msrs(struct vmx_msr_entry *e, int n)
1304 {
1305         int i;
1306
1307         for (i = 0; i < n; ++i)
1308                 wrmsrl(e[i].index, e[i].data);
1309 }
1310 EXPORT_SYMBOL_GPL(load_msrs);
1311
1312 void save_msrs(struct vmx_msr_entry *e, int n)
1313 {
1314         int i;
1315
1316         for (i = 0; i < n; ++i)
1317                 rdmsrl(e[i].index, e[i].data);
1318 }
1319 EXPORT_SYMBOL_GPL(save_msrs);
1320
1321 static int kvm_dev_ioctl_run(struct kvm *kvm, struct kvm_run *kvm_run)
1322 {
1323         struct kvm_vcpu *vcpu;
1324         int r;
1325
1326         if (!valid_vcpu(kvm_run->vcpu))
1327                 return -EINVAL;
1328
1329         vcpu = vcpu_load(kvm, kvm_run->vcpu);
1330         if (!vcpu)
1331                 return -ENOENT;
1332
1333         if (kvm_run->emulated) {
1334                 kvm_arch_ops->skip_emulated_instruction(vcpu);
1335                 kvm_run->emulated = 0;
1336         }
1337
1338         if (kvm_run->mmio_completed) {
1339                 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1340                 vcpu->mmio_read_completed = 1;
1341         }
1342
1343         vcpu->mmio_needed = 0;
1344
1345         r = kvm_arch_ops->run(vcpu, kvm_run);
1346
1347         vcpu_put(vcpu);
1348         return r;
1349 }
1350
1351 static int kvm_dev_ioctl_get_regs(struct kvm *kvm, struct kvm_regs *regs)
1352 {
1353         struct kvm_vcpu *vcpu;
1354
1355         if (!valid_vcpu(regs->vcpu))
1356                 return -EINVAL;
1357
1358         vcpu = vcpu_load(kvm, regs->vcpu);
1359         if (!vcpu)
1360                 return -ENOENT;
1361
1362         kvm_arch_ops->cache_regs(vcpu);
1363
1364         regs->rax = vcpu->regs[VCPU_REGS_RAX];
1365         regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1366         regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1367         regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1368         regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1369         regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1370         regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1371         regs->rbp = vcpu->regs[VCPU_REGS_RBP];
1372 #ifdef CONFIG_X86_64
1373         regs->r8 = vcpu->regs[VCPU_REGS_R8];
1374         regs->r9 = vcpu->regs[VCPU_REGS_R9];
1375         regs->r10 = vcpu->regs[VCPU_REGS_R10];
1376         regs->r11 = vcpu->regs[VCPU_REGS_R11];
1377         regs->r12 = vcpu->regs[VCPU_REGS_R12];
1378         regs->r13 = vcpu->regs[VCPU_REGS_R13];
1379         regs->r14 = vcpu->regs[VCPU_REGS_R14];
1380         regs->r15 = vcpu->regs[VCPU_REGS_R15];
1381 #endif
1382
1383         regs->rip = vcpu->rip;
1384         regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1385
1386         /*
1387          * Don't leak debug flags in case they were set for guest debugging
1388          */
1389         if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1390                 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1391
1392         vcpu_put(vcpu);
1393
1394         return 0;
1395 }
1396
1397 static int kvm_dev_ioctl_set_regs(struct kvm *kvm, struct kvm_regs *regs)
1398 {
1399         struct kvm_vcpu *vcpu;
1400
1401         if (!valid_vcpu(regs->vcpu))
1402                 return -EINVAL;
1403
1404         vcpu = vcpu_load(kvm, regs->vcpu);
1405         if (!vcpu)
1406                 return -ENOENT;
1407
1408         vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1409         vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1410         vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1411         vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1412         vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1413         vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1414         vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1415         vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
1416 #ifdef CONFIG_X86_64
1417         vcpu->regs[VCPU_REGS_R8] = regs->r8;
1418         vcpu->regs[VCPU_REGS_R9] = regs->r9;
1419         vcpu->regs[VCPU_REGS_R10] = regs->r10;
1420         vcpu->regs[VCPU_REGS_R11] = regs->r11;
1421         vcpu->regs[VCPU_REGS_R12] = regs->r12;
1422         vcpu->regs[VCPU_REGS_R13] = regs->r13;
1423         vcpu->regs[VCPU_REGS_R14] = regs->r14;
1424         vcpu->regs[VCPU_REGS_R15] = regs->r15;
1425 #endif
1426
1427         vcpu->rip = regs->rip;
1428         kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1429
1430         kvm_arch_ops->decache_regs(vcpu);
1431
1432         vcpu_put(vcpu);
1433
1434         return 0;
1435 }
1436
1437 static void get_segment(struct kvm_vcpu *vcpu,
1438                         struct kvm_segment *var, int seg)
1439 {
1440         return kvm_arch_ops->get_segment(vcpu, var, seg);
1441 }
1442
1443 static int kvm_dev_ioctl_get_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1444 {
1445         struct kvm_vcpu *vcpu;
1446         struct descriptor_table dt;
1447
1448         if (!valid_vcpu(sregs->vcpu))
1449                 return -EINVAL;
1450         vcpu = vcpu_load(kvm, sregs->vcpu);
1451         if (!vcpu)
1452                 return -ENOENT;
1453
1454         get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1455         get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1456         get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1457         get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1458         get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1459         get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1460
1461         get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1462         get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1463
1464         kvm_arch_ops->get_idt(vcpu, &dt);
1465         sregs->idt.limit = dt.limit;
1466         sregs->idt.base = dt.base;
1467         kvm_arch_ops->get_gdt(vcpu, &dt);
1468         sregs->gdt.limit = dt.limit;
1469         sregs->gdt.base = dt.base;
1470
1471         kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1472         sregs->cr0 = vcpu->cr0;
1473         sregs->cr2 = vcpu->cr2;
1474         sregs->cr3 = vcpu->cr3;
1475         sregs->cr4 = vcpu->cr4;
1476         sregs->cr8 = vcpu->cr8;
1477         sregs->efer = vcpu->shadow_efer;
1478         sregs->apic_base = vcpu->apic_base;
1479
1480         memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
1481                sizeof sregs->interrupt_bitmap);
1482
1483         vcpu_put(vcpu);
1484
1485         return 0;
1486 }
1487
1488 static void set_segment(struct kvm_vcpu *vcpu,
1489                         struct kvm_segment *var, int seg)
1490 {
1491         return kvm_arch_ops->set_segment(vcpu, var, seg);
1492 }
1493
1494 static int kvm_dev_ioctl_set_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1495 {
1496         struct kvm_vcpu *vcpu;
1497         int mmu_reset_needed = 0;
1498         int i;
1499         struct descriptor_table dt;
1500
1501         if (!valid_vcpu(sregs->vcpu))
1502                 return -EINVAL;
1503         vcpu = vcpu_load(kvm, sregs->vcpu);
1504         if (!vcpu)
1505                 return -ENOENT;
1506
1507         set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1508         set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1509         set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1510         set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1511         set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1512         set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1513
1514         set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1515         set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1516
1517         dt.limit = sregs->idt.limit;
1518         dt.base = sregs->idt.base;
1519         kvm_arch_ops->set_idt(vcpu, &dt);
1520         dt.limit = sregs->gdt.limit;
1521         dt.base = sregs->gdt.base;
1522         kvm_arch_ops->set_gdt(vcpu, &dt);
1523
1524         vcpu->cr2 = sregs->cr2;
1525         mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
1526         vcpu->cr3 = sregs->cr3;
1527
1528         vcpu->cr8 = sregs->cr8;
1529
1530         mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
1531 #ifdef CONFIG_X86_64
1532         kvm_arch_ops->set_efer(vcpu, sregs->efer);
1533 #endif
1534         vcpu->apic_base = sregs->apic_base;
1535
1536         kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1537
1538         mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
1539         kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0);
1540
1541         mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
1542         kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1543         if (!is_long_mode(vcpu) && is_pae(vcpu))
1544                 load_pdptrs(vcpu, vcpu->cr3);
1545
1546         if (mmu_reset_needed)
1547                 kvm_mmu_reset_context(vcpu);
1548
1549         memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
1550                sizeof vcpu->irq_pending);
1551         vcpu->irq_summary = 0;
1552         for (i = 0; i < NR_IRQ_WORDS; ++i)
1553                 if (vcpu->irq_pending[i])
1554                         __set_bit(i, &vcpu->irq_summary);
1555
1556         vcpu_put(vcpu);
1557
1558         return 0;
1559 }
1560
1561 /*
1562  * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1563  * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
1564  *
1565  * This list is modified at module load time to reflect the
1566  * capabilities of the host cpu.
1567  */
1568 static u32 msrs_to_save[] = {
1569         MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
1570         MSR_K6_STAR,
1571 #ifdef CONFIG_X86_64
1572         MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
1573 #endif
1574         MSR_IA32_TIME_STAMP_COUNTER,
1575 };
1576
1577 static unsigned num_msrs_to_save;
1578
1579 static __init void kvm_init_msr_list(void)
1580 {
1581         u32 dummy[2];
1582         unsigned i, j;
1583
1584         for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1585                 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1586                         continue;
1587                 if (j < i)
1588                         msrs_to_save[j] = msrs_to_save[i];
1589                 j++;
1590         }
1591         num_msrs_to_save = j;
1592 }
1593
1594 /*
1595  * Adapt set_msr() to msr_io()'s calling convention
1596  */
1597 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1598 {
1599         return set_msr(vcpu, index, *data);
1600 }
1601
1602 /*
1603  * Read or write a bunch of msrs. All parameters are kernel addresses.
1604  *
1605  * @return number of msrs set successfully.
1606  */
1607 static int __msr_io(struct kvm *kvm, struct kvm_msrs *msrs,
1608                     struct kvm_msr_entry *entries,
1609                     int (*do_msr)(struct kvm_vcpu *vcpu,
1610                                   unsigned index, u64 *data))
1611 {
1612         struct kvm_vcpu *vcpu;
1613         int i;
1614
1615         if (!valid_vcpu(msrs->vcpu))
1616                 return -EINVAL;
1617
1618         vcpu = vcpu_load(kvm, msrs->vcpu);
1619         if (!vcpu)
1620                 return -ENOENT;
1621
1622         for (i = 0; i < msrs->nmsrs; ++i)
1623                 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1624                         break;
1625
1626         vcpu_put(vcpu);
1627
1628         return i;
1629 }
1630
1631 /*
1632  * Read or write a bunch of msrs. Parameters are user addresses.
1633  *
1634  * @return number of msrs set successfully.
1635  */
1636 static int msr_io(struct kvm *kvm, struct kvm_msrs __user *user_msrs,
1637                   int (*do_msr)(struct kvm_vcpu *vcpu,
1638                                 unsigned index, u64 *data),
1639                   int writeback)
1640 {
1641         struct kvm_msrs msrs;
1642         struct kvm_msr_entry *entries;
1643         int r, n;
1644         unsigned size;
1645
1646         r = -EFAULT;
1647         if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1648                 goto out;
1649
1650         r = -E2BIG;
1651         if (msrs.nmsrs >= MAX_IO_MSRS)
1652                 goto out;
1653
1654         r = -ENOMEM;
1655         size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1656         entries = vmalloc(size);
1657         if (!entries)
1658                 goto out;
1659
1660         r = -EFAULT;
1661         if (copy_from_user(entries, user_msrs->entries, size))
1662                 goto out_free;
1663
1664         r = n = __msr_io(kvm, &msrs, entries, do_msr);
1665         if (r < 0)
1666                 goto out_free;
1667
1668         r = -EFAULT;
1669         if (writeback && copy_to_user(user_msrs->entries, entries, size))
1670                 goto out_free;
1671
1672         r = n;
1673
1674 out_free:
1675         vfree(entries);
1676 out:
1677         return r;
1678 }
1679
1680 /*
1681  * Translate a guest virtual address to a guest physical address.
1682  */
1683 static int kvm_dev_ioctl_translate(struct kvm *kvm, struct kvm_translation *tr)
1684 {
1685         unsigned long vaddr = tr->linear_address;
1686         struct kvm_vcpu *vcpu;
1687         gpa_t gpa;
1688
1689         vcpu = vcpu_load(kvm, tr->vcpu);
1690         if (!vcpu)
1691                 return -ENOENT;
1692         spin_lock(&kvm->lock);
1693         gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
1694         tr->physical_address = gpa;
1695         tr->valid = gpa != UNMAPPED_GVA;
1696         tr->writeable = 1;
1697         tr->usermode = 0;
1698         spin_unlock(&kvm->lock);
1699         vcpu_put(vcpu);
1700
1701         return 0;
1702 }
1703
1704 static int kvm_dev_ioctl_interrupt(struct kvm *kvm, struct kvm_interrupt *irq)
1705 {
1706         struct kvm_vcpu *vcpu;
1707
1708         if (!valid_vcpu(irq->vcpu))
1709                 return -EINVAL;
1710         if (irq->irq < 0 || irq->irq >= 256)
1711                 return -EINVAL;
1712         vcpu = vcpu_load(kvm, irq->vcpu);
1713         if (!vcpu)
1714                 return -ENOENT;
1715
1716         set_bit(irq->irq, vcpu->irq_pending);
1717         set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
1718
1719         vcpu_put(vcpu);
1720
1721         return 0;
1722 }
1723
1724 static int kvm_dev_ioctl_debug_guest(struct kvm *kvm,
1725                                      struct kvm_debug_guest *dbg)
1726 {
1727         struct kvm_vcpu *vcpu;
1728         int r;
1729
1730         if (!valid_vcpu(dbg->vcpu))
1731                 return -EINVAL;
1732         vcpu = vcpu_load(kvm, dbg->vcpu);
1733         if (!vcpu)
1734                 return -ENOENT;
1735
1736         r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
1737
1738         vcpu_put(vcpu);
1739
1740         return r;
1741 }
1742
1743 static long kvm_dev_ioctl(struct file *filp,
1744                           unsigned int ioctl, unsigned long arg)
1745 {
1746         struct kvm *kvm = filp->private_data;
1747         int r = -EINVAL;
1748
1749         switch (ioctl) {
1750         case KVM_GET_API_VERSION:
1751                 r = KVM_API_VERSION;
1752                 break;
1753         case KVM_CREATE_VCPU: {
1754                 r = kvm_dev_ioctl_create_vcpu(kvm, arg);
1755                 if (r)
1756                         goto out;
1757                 break;
1758         }
1759         case KVM_RUN: {
1760                 struct kvm_run kvm_run;
1761
1762                 r = -EFAULT;
1763                 if (copy_from_user(&kvm_run, (void *)arg, sizeof kvm_run))
1764                         goto out;
1765                 r = kvm_dev_ioctl_run(kvm, &kvm_run);
1766                 if (r < 0 &&  r != -EINTR)
1767                         goto out;
1768                 if (copy_to_user((void *)arg, &kvm_run, sizeof kvm_run)) {
1769                         r = -EFAULT;
1770                         goto out;
1771                 }
1772                 break;
1773         }
1774         case KVM_GET_REGS: {
1775                 struct kvm_regs kvm_regs;
1776
1777                 r = -EFAULT;
1778                 if (copy_from_user(&kvm_regs, (void *)arg, sizeof kvm_regs))
1779                         goto out;
1780                 r = kvm_dev_ioctl_get_regs(kvm, &kvm_regs);
1781                 if (r)
1782                         goto out;
1783                 r = -EFAULT;
1784                 if (copy_to_user((void *)arg, &kvm_regs, sizeof kvm_regs))
1785                         goto out;
1786                 r = 0;
1787                 break;
1788         }
1789         case KVM_SET_REGS: {
1790                 struct kvm_regs kvm_regs;
1791
1792                 r = -EFAULT;
1793                 if (copy_from_user(&kvm_regs, (void *)arg, sizeof kvm_regs))
1794                         goto out;
1795                 r = kvm_dev_ioctl_set_regs(kvm, &kvm_regs);
1796                 if (r)
1797                         goto out;
1798                 r = 0;
1799                 break;
1800         }
1801         case KVM_GET_SREGS: {
1802                 struct kvm_sregs kvm_sregs;
1803
1804                 r = -EFAULT;
1805                 if (copy_from_user(&kvm_sregs, (void *)arg, sizeof kvm_sregs))
1806                         goto out;
1807                 r = kvm_dev_ioctl_get_sregs(kvm, &kvm_sregs);
1808                 if (r)
1809                         goto out;
1810                 r = -EFAULT;
1811                 if (copy_to_user((void *)arg, &kvm_sregs, sizeof kvm_sregs))
1812                         goto out;
1813                 r = 0;
1814                 break;
1815         }
1816         case KVM_SET_SREGS: {
1817                 struct kvm_sregs kvm_sregs;
1818
1819                 r = -EFAULT;
1820                 if (copy_from_user(&kvm_sregs, (void *)arg, sizeof kvm_sregs))
1821                         goto out;
1822                 r = kvm_dev_ioctl_set_sregs(kvm, &kvm_sregs);
1823                 if (r)
1824                         goto out;
1825                 r = 0;
1826                 break;
1827         }
1828         case KVM_TRANSLATE: {
1829                 struct kvm_translation tr;
1830
1831                 r = -EFAULT;
1832                 if (copy_from_user(&tr, (void *)arg, sizeof tr))
1833                         goto out;
1834                 r = kvm_dev_ioctl_translate(kvm, &tr);
1835                 if (r)
1836                         goto out;
1837                 r = -EFAULT;
1838                 if (copy_to_user((void *)arg, &tr, sizeof tr))
1839                         goto out;
1840                 r = 0;
1841                 break;
1842         }
1843         case KVM_INTERRUPT: {
1844                 struct kvm_interrupt irq;
1845
1846                 r = -EFAULT;
1847                 if (copy_from_user(&irq, (void *)arg, sizeof irq))
1848                         goto out;
1849                 r = kvm_dev_ioctl_interrupt(kvm, &irq);
1850                 if (r)
1851                         goto out;
1852                 r = 0;
1853                 break;
1854         }
1855         case KVM_DEBUG_GUEST: {
1856                 struct kvm_debug_guest dbg;
1857
1858                 r = -EFAULT;
1859                 if (copy_from_user(&dbg, (void *)arg, sizeof dbg))
1860                         goto out;
1861                 r = kvm_dev_ioctl_debug_guest(kvm, &dbg);
1862                 if (r)
1863                         goto out;
1864                 r = 0;
1865                 break;
1866         }
1867         case KVM_SET_MEMORY_REGION: {
1868                 struct kvm_memory_region kvm_mem;
1869
1870                 r = -EFAULT;
1871                 if (copy_from_user(&kvm_mem, (void *)arg, sizeof kvm_mem))
1872                         goto out;
1873                 r = kvm_dev_ioctl_set_memory_region(kvm, &kvm_mem);
1874                 if (r)
1875                         goto out;
1876                 break;
1877         }
1878         case KVM_GET_DIRTY_LOG: {
1879                 struct kvm_dirty_log log;
1880
1881                 r = -EFAULT;
1882                 if (copy_from_user(&log, (void *)arg, sizeof log))
1883                         goto out;
1884                 r = kvm_dev_ioctl_get_dirty_log(kvm, &log);
1885                 if (r)
1886                         goto out;
1887                 break;
1888         }
1889         case KVM_GET_MSRS:
1890                 r = msr_io(kvm, (void __user *)arg, get_msr, 1);
1891                 break;
1892         case KVM_SET_MSRS:
1893                 r = msr_io(kvm, (void __user *)arg, do_set_msr, 0);
1894                 break;
1895         case KVM_GET_MSR_INDEX_LIST: {
1896                 struct kvm_msr_list __user *user_msr_list = (void __user *)arg;
1897                 struct kvm_msr_list msr_list;
1898                 unsigned n;
1899
1900                 r = -EFAULT;
1901                 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
1902                         goto out;
1903                 n = msr_list.nmsrs;
1904                 msr_list.nmsrs = num_msrs_to_save;
1905                 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
1906                         goto out;
1907                 r = -E2BIG;
1908                 if (n < num_msrs_to_save)
1909                         goto out;
1910                 r = -EFAULT;
1911                 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
1912                                  num_msrs_to_save * sizeof(u32)))
1913                         goto out;
1914                 r = 0;
1915         }
1916         default:
1917                 ;
1918         }
1919 out:
1920         return r;
1921 }
1922
1923 static struct page *kvm_dev_nopage(struct vm_area_struct *vma,
1924                                    unsigned long address,
1925                                    int *type)
1926 {
1927         struct kvm *kvm = vma->vm_file->private_data;
1928         unsigned long pgoff;
1929         struct kvm_memory_slot *slot;
1930         struct page *page;
1931
1932         *type = VM_FAULT_MINOR;
1933         pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1934         slot = gfn_to_memslot(kvm, pgoff);
1935         if (!slot)
1936                 return NOPAGE_SIGBUS;
1937         page = gfn_to_page(slot, pgoff);
1938         if (!page)
1939                 return NOPAGE_SIGBUS;
1940         get_page(page);
1941         return page;
1942 }
1943
1944 static struct vm_operations_struct kvm_dev_vm_ops = {
1945         .nopage = kvm_dev_nopage,
1946 };
1947
1948 static int kvm_dev_mmap(struct file *file, struct vm_area_struct *vma)
1949 {
1950         vma->vm_ops = &kvm_dev_vm_ops;
1951         return 0;
1952 }
1953
1954 static struct file_operations kvm_chardev_ops = {
1955         .open           = kvm_dev_open,
1956         .release        = kvm_dev_release,
1957         .unlocked_ioctl = kvm_dev_ioctl,
1958         .compat_ioctl   = kvm_dev_ioctl,
1959         .mmap           = kvm_dev_mmap,
1960 };
1961
1962 static struct miscdevice kvm_dev = {
1963         MISC_DYNAMIC_MINOR,
1964         "kvm",
1965         &kvm_chardev_ops,
1966 };
1967
1968 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
1969                        void *v)
1970 {
1971         if (val == SYS_RESTART) {
1972                 /*
1973                  * Some (well, at least mine) BIOSes hang on reboot if
1974                  * in vmx root mode.
1975                  */
1976                 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
1977                 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
1978         }
1979         return NOTIFY_OK;
1980 }
1981
1982 static struct notifier_block kvm_reboot_notifier = {
1983         .notifier_call = kvm_reboot,
1984         .priority = 0,
1985 };
1986
1987 static __init void kvm_init_debug(void)
1988 {
1989         struct kvm_stats_debugfs_item *p;
1990
1991         debugfs_dir = debugfs_create_dir("kvm", 0);
1992         for (p = debugfs_entries; p->name; ++p)
1993                 p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir,
1994                                                p->data);
1995 }
1996
1997 static void kvm_exit_debug(void)
1998 {
1999         struct kvm_stats_debugfs_item *p;
2000
2001         for (p = debugfs_entries; p->name; ++p)
2002                 debugfs_remove(p->dentry);
2003         debugfs_remove(debugfs_dir);
2004 }
2005
2006 hpa_t bad_page_address;
2007
2008 int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
2009 {
2010         int r;
2011
2012         if (kvm_arch_ops) {
2013                 printk(KERN_ERR "kvm: already loaded the other module\n");
2014                 return -EEXIST;
2015         }
2016
2017         if (!ops->cpu_has_kvm_support()) {
2018                 printk(KERN_ERR "kvm: no hardware support\n");
2019                 return -EOPNOTSUPP;
2020         }
2021         if (ops->disabled_by_bios()) {
2022                 printk(KERN_ERR "kvm: disabled by bios\n");
2023                 return -EOPNOTSUPP;
2024         }
2025
2026         kvm_arch_ops = ops;
2027
2028         r = kvm_arch_ops->hardware_setup();
2029         if (r < 0)
2030             return r;
2031
2032         on_each_cpu(kvm_arch_ops->hardware_enable, 0, 0, 1);
2033         register_reboot_notifier(&kvm_reboot_notifier);
2034
2035         kvm_chardev_ops.owner = module;
2036
2037         r = misc_register(&kvm_dev);
2038         if (r) {
2039                 printk (KERN_ERR "kvm: misc device register failed\n");
2040                 goto out_free;
2041         }
2042
2043         return r;
2044
2045 out_free:
2046         unregister_reboot_notifier(&kvm_reboot_notifier);
2047         on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
2048         kvm_arch_ops->hardware_unsetup();
2049         return r;
2050 }
2051
2052 void kvm_exit_arch(void)
2053 {
2054         misc_deregister(&kvm_dev);
2055
2056         unregister_reboot_notifier(&kvm_reboot_notifier);
2057         on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
2058         kvm_arch_ops->hardware_unsetup();
2059         kvm_arch_ops = NULL;
2060 }
2061
2062 static __init int kvm_init(void)
2063 {
2064         static struct page *bad_page;
2065         int r = 0;
2066
2067         kvm_init_debug();
2068
2069         kvm_init_msr_list();
2070
2071         if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
2072                 r = -ENOMEM;
2073                 goto out;
2074         }
2075
2076         bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
2077         memset(__va(bad_page_address), 0, PAGE_SIZE);
2078
2079         return r;
2080
2081 out:
2082         kvm_exit_debug();
2083         return r;
2084 }
2085
2086 static __exit void kvm_exit(void)
2087 {
2088         kvm_exit_debug();
2089         __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
2090 }
2091
2092 module_init(kvm_init)
2093 module_exit(kvm_exit)
2094
2095 EXPORT_SYMBOL_GPL(kvm_init_arch);
2096 EXPORT_SYMBOL_GPL(kvm_exit_arch);