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 #include "irq.h"
  22
  23 #include <linux/kvm.h>
  24 #include <linux/module.h>
  25 #include <linux/errno.h>
  26 #include <linux/percpu.h>
  27 #include <linux/gfp.h>
  28 #include <linux/mm.h>
  29 #include <linux/miscdevice.h>
  30 #include <linux/vmalloc.h>
  31 #include <linux/reboot.h>
  32 #include <linux/debugfs.h>
  33 #include <linux/highmem.h>
  34 #include <linux/file.h>
  35 #include <linux/sysdev.h>
  36 #include <linux/cpu.h>
  37 #include <linux/sched.h>
  38 #include <linux/cpumask.h>
  39 #include <linux/smp.h>
  40 #include <linux/anon_inodes.h>
  41 #include <linux/profile.h>
  42
  43 #include <asm/processor.h>
  44 #include <asm/msr.h>
  45 #include <asm/io.h>
  46 #include <asm/uaccess.h>
  47 #include <asm/desc.h>
  48
  49 MODULE_AUTHOR("Qumranet");
  50 MODULE_LICENSE("GPL");
  51
  52 static DEFINE_SPINLOCK(kvm_lock);
  53 static LIST_HEAD(vm_list);
  54
  55 static cpumask_t cpus_hardware_enabled;
  56
  57 struct kvm_x86_ops *kvm_x86_ops;
  58 struct kmem_cache *kvm_vcpu_cache;
  59 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
  60
  61 static __read_mostly struct preempt_ops kvm_preempt_ops;
  62
  63 #define STAT_OFFSET(x) offsetof(struct kvm_vcpu, stat.x)
  64
  65 static struct kvm_stats_debugfs_item {
  66         const char *name;
  67         int offset;
  68         struct dentry *dentry;
  69 } debugfs_entries[] = {
  70         { "pf_fixed", STAT_OFFSET(pf_fixed) },
  71         { "pf_guest", STAT_OFFSET(pf_guest) },
  72         { "tlb_flush", STAT_OFFSET(tlb_flush) },
  73         { "invlpg", STAT_OFFSET(invlpg) },
  74         { "exits", STAT_OFFSET(exits) },
  75         { "io_exits", STAT_OFFSET(io_exits) },
  76         { "mmio_exits", STAT_OFFSET(mmio_exits) },
  77         { "signal_exits", STAT_OFFSET(signal_exits) },
  78         { "irq_window", STAT_OFFSET(irq_window_exits) },
  79         { "halt_exits", STAT_OFFSET(halt_exits) },
  80         { "halt_wakeup", STAT_OFFSET(halt_wakeup) },
  81         { "request_irq", STAT_OFFSET(request_irq_exits) },
  82         { "irq_exits", STAT_OFFSET(irq_exits) },
  83         { "light_exits", STAT_OFFSET(light_exits) },
  84         { "efer_reload", STAT_OFFSET(efer_reload) },
  85         { NULL }
  86 };
  87
  88 static struct dentry *debugfs_dir;
  89
  90 #define MAX_IO_MSRS 256
  91
  92 #define CR0_RESERVED_BITS                                               \
  93         (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
  94                           | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
  95                           | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))
  96 #define CR4_RESERVED_BITS                                               \
  97         (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
  98                           | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE     \
  99                           | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR  \
 100                           | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
 101
 102 #define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
 103 #define EFER_RESERVED_BITS 0xfffffffffffff2fe
 104
 105 #ifdef CONFIG_X86_64
 106 // LDT or TSS descriptor in the GDT. 16 bytes.
 107 struct segment_descriptor_64 {
 108         struct segment_descriptor s;
 109         u32 base_higher;
 110         u32 pad_zero;
 111 };
 112
 113 #endif
 114
 115 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
 116                            unsigned long arg);
 117
 118 unsigned long segment_base(u16 selector)
 119 {
 120         struct descriptor_table gdt;
 121         struct segment_descriptor *d;
 122         unsigned long table_base;
 123         typedef unsigned long ul;
 124         unsigned long v;
 125
 126         if (selector == 0)
 127                 return 0;
 128
 129         asm ("sgdt %0" : "=m"(gdt));
 130         table_base = gdt.base;
 131
 132         if (selector & 4) {           /* from ldt */
 133                 u16 ldt_selector;
 134
 135                 asm ("sldt %0" : "=g"(ldt_selector));
 136                 table_base = segment_base(ldt_selector);
 137         }
 138         d = (struct segment_descriptor *)(table_base + (selector & ~7));
 139         v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
 140 #ifdef CONFIG_X86_64
 141         if (d->system == 0
 142             && (d->type == 2 || d->type == 9 || d->type == 11))
 143                 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
 144 #endif
 145         return v;
 146 }
 147 EXPORT_SYMBOL_GPL(segment_base);
 148
 149 static inline int valid_vcpu(int n)
 150 {
 151         return likely(n >= 0 && n < KVM_MAX_VCPUS);
 152 }
 153
 154 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
 155 {
 156         if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
 157                 return;
 158
 159         vcpu->guest_fpu_loaded = 1;
 160         fx_save(&vcpu->host_fx_image);
 161         fx_restore(&vcpu->guest_fx_image);
 162 }
 163 EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
 164
 165 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
 166 {
 167         if (!vcpu->guest_fpu_loaded)
 168                 return;
 169
 170         vcpu->guest_fpu_loaded = 0;
 171         fx_save(&vcpu->guest_fx_image);
 172         fx_restore(&vcpu->host_fx_image);
 173 }
 174 EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
 175
 176 /*
 177  * Switches to specified vcpu, until a matching vcpu_put()
 178  */
 179 static void vcpu_load(struct kvm_vcpu *vcpu)
 180 {
 181         int cpu;
 182
 183         mutex_lock(&vcpu->mutex);
 184         cpu = get_cpu();
 185         preempt_notifier_register(&vcpu->preempt_notifier);
 186         kvm_x86_ops->vcpu_load(vcpu, cpu);
 187         put_cpu();
 188 }
 189
 190 static void vcpu_put(struct kvm_vcpu *vcpu)
 191 {
 192         preempt_disable();
 193         kvm_x86_ops->vcpu_put(vcpu);
 194         preempt_notifier_unregister(&vcpu->preempt_notifier);
 195         preempt_enable();
 196         mutex_unlock(&vcpu->mutex);
 197 }
 198
 199 static void ack_flush(void *_completed)
 200 {
 201         atomic_t *completed = _completed;
 202
 203         atomic_inc(completed);
 204 }
 205
 206 void kvm_flush_remote_tlbs(struct kvm *kvm)
 207 {
 208         int i, cpu, needed;
 209         cpumask_t cpus;
 210         struct kvm_vcpu *vcpu;
 211         atomic_t completed;
 212
 213         atomic_set(&completed, 0);
 214         cpus_clear(cpus);
 215         needed = 0;
 216         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 217                 vcpu = kvm->vcpus[i];
 218                 if (!vcpu)
 219                         continue;
 220                 if (test_and_set_bit(KVM_TLB_FLUSH, &vcpu->requests))
 221                         continue;
 222                 cpu = vcpu->cpu;
 223                 if (cpu != -1 && cpu != raw_smp_processor_id())
 224                         if (!cpu_isset(cpu, cpus)) {
 225                                 cpu_set(cpu, cpus);
 226                                 ++needed;
 227                         }
 228         }
 229
 230         /*
 231          * We really want smp_call_function_mask() here.  But that's not
 232          * available, so ipi all cpus in parallel and wait for them
 233          * to complete.
 234          */
 235         for (cpu = first_cpu(cpus); cpu != NR_CPUS; cpu = next_cpu(cpu, cpus))
 236                 smp_call_function_single(cpu, ack_flush, &completed, 1, 0);
 237         while (atomic_read(&completed) != needed) {
 238                 cpu_relax();
 239                 barrier();
 240         }
 241 }
 242
 243 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 244 {
 245         struct page *page;
 246         int r;
 247
 248         mutex_init(&vcpu->mutex);
 249         vcpu->cpu = -1;
 250         vcpu->mmu.root_hpa = INVALID_PAGE;
 251         vcpu->kvm = kvm;
 252         vcpu->vcpu_id = id;
 253         if (!irqchip_in_kernel(kvm) || id == 0)
 254                 vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
 255         else
 256                 vcpu->mp_state = VCPU_MP_STATE_UNINITIALIZED;
 257         init_waitqueue_head(&vcpu->wq);
 258
 259         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 260         if (!page) {
 261                 r = -ENOMEM;
 262                 goto fail;
 263         }
 264         vcpu->run = page_address(page);
 265
 266         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 267         if (!page) {
 268                 r = -ENOMEM;
 269                 goto fail_free_run;
 270         }
 271         vcpu->pio_data = page_address(page);
 272
 273         r = kvm_mmu_create(vcpu);
 274         if (r < 0)
 275                 goto fail_free_pio_data;
 276
 277         return 0;
 278
 279 fail_free_pio_data:
 280         free_page((unsigned long)vcpu->pio_data);
 281 fail_free_run:
 282         free_page((unsigned long)vcpu->run);
 283 fail:
 284         return -ENOMEM;
 285 }
 286 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
 287
 288 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
 289 {
 290         kvm_mmu_destroy(vcpu);
 291         if (vcpu->apic)
 292                 hrtimer_cancel(&vcpu->apic->timer.dev);
 293         kvm_free_apic(vcpu->apic);
 294         free_page((unsigned long)vcpu->pio_data);
 295         free_page((unsigned long)vcpu->run);
 296 }
 297 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
 298
 299 static struct kvm *kvm_create_vm(void)
 300 {
 301         struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
 302
 303         if (!kvm)
 304                 return ERR_PTR(-ENOMEM);
 305
 306         kvm_io_bus_init(&kvm->pio_bus);
 307         mutex_init(&kvm->lock);
 308         INIT_LIST_HEAD(&kvm->active_mmu_pages);
 309         kvm_io_bus_init(&kvm->mmio_bus);
 310         spin_lock(&kvm_lock);
 311         list_add(&kvm->vm_list, &vm_list);
 312         spin_unlock(&kvm_lock);
 313         return kvm;
 314 }
 315
 316 /*
 317  * Free any memory in @free but not in @dont.
 318  */
 319 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
 320                                   struct kvm_memory_slot *dont)
 321 {
 322         int i;
 323
 324         if (!dont || free->phys_mem != dont->phys_mem)
 325                 if (free->phys_mem) {
 326                         for (i = 0; i < free->npages; ++i)
 327                                 if (free->phys_mem[i])
 328                                         __free_page(free->phys_mem[i]);
 329                         vfree(free->phys_mem);
 330                 }
 331
 332         if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
 333                 vfree(free->dirty_bitmap);
 334
 335         free->phys_mem = NULL;
 336         free->npages = 0;
 337         free->dirty_bitmap = NULL;
 338 }
 339
 340 static void kvm_free_physmem(struct kvm *kvm)
 341 {
 342         int i;
 343
 344         for (i = 0; i < kvm->nmemslots; ++i)
 345                 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
 346 }
 347
 348 static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
 349 {
 350         int i;
 351
 352         for (i = 0; i < ARRAY_SIZE(vcpu->pio.guest_pages); ++i)
 353                 if (vcpu->pio.guest_pages[i]) {
 354                         __free_page(vcpu->pio.guest_pages[i]);
 355                         vcpu->pio.guest_pages[i] = NULL;
 356                 }
 357 }
 358
 359 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
 360 {
 361         vcpu_load(vcpu);
 362         kvm_mmu_unload(vcpu);
 363         vcpu_put(vcpu);
 364 }
 365
 366 static void kvm_free_vcpus(struct kvm *kvm)
 367 {
 368         unsigned int i;
 369
 370         /*
 371          * Unpin any mmu pages first.
 372          */
 373         for (i = 0; i < KVM_MAX_VCPUS; ++i)
 374                 if (kvm->vcpus[i])
 375                         kvm_unload_vcpu_mmu(kvm->vcpus[i]);
 376         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 377                 if (kvm->vcpus[i]) {
 378                         kvm_x86_ops->vcpu_free(kvm->vcpus[i]);
 379                         kvm->vcpus[i] = NULL;
 380                 }
 381         }
 382
 383 }
 384
 385 static void kvm_destroy_vm(struct kvm *kvm)
 386 {
 387         spin_lock(&kvm_lock);
 388         list_del(&kvm->vm_list);
 389         spin_unlock(&kvm_lock);
 390         kvm_io_bus_destroy(&kvm->pio_bus);
 391         kvm_io_bus_destroy(&kvm->mmio_bus);
 392         kfree(kvm->vpic);
 393         kfree(kvm->vioapic);
 394         kvm_free_vcpus(kvm);
 395         kvm_free_physmem(kvm);
 396         kfree(kvm);
 397 }
 398
 399 static int kvm_vm_release(struct inode *inode, struct file *filp)
 400 {
 401         struct kvm *kvm = filp->private_data;
 402
 403         kvm_destroy_vm(kvm);
 404         return 0;
 405 }
 406
 407 static void inject_gp(struct kvm_vcpu *vcpu)
 408 {
 409         kvm_x86_ops->inject_gp(vcpu, 0);
 410 }
 411
 412 /*
 413  * Load the pae pdptrs.  Return true is they are all valid.
 414  */
 415 static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
 416 {
 417         gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
 418         unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
 419         int i;
 420         u64 *pdpt;
 421         int ret;
 422         struct page *page;
 423         u64 pdpte[ARRAY_SIZE(vcpu->pdptrs)];
 424
 425         mutex_lock(&vcpu->kvm->lock);
 426         page = gfn_to_page(vcpu->kvm, pdpt_gfn);
 427         if (!page) {
 428                 ret = 0;
 429                 goto out;
 430         }
 431
 432         pdpt = kmap_atomic(page, KM_USER0);
 433         memcpy(pdpte, pdpt+offset, sizeof(pdpte));
 434         kunmap_atomic(pdpt, KM_USER0);
 435
 436         for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
 437                 if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) {
 438                         ret = 0;
 439                         goto out;
 440                 }
 441         }
 442         ret = 1;
 443
 444         memcpy(vcpu->pdptrs, pdpte, sizeof(vcpu->pdptrs));
 445 out:
 446         mutex_unlock(&vcpu->kvm->lock);
 447
 448         return ret;
 449 }
 450
 451 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 452 {
 453         if (cr0 & CR0_RESERVED_BITS) {
 454                 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
 455                        cr0, vcpu->cr0);
 456                 inject_gp(vcpu);
 457                 return;
 458         }
 459
 460         if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) {
 461                 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
 462                 inject_gp(vcpu);
 463                 return;
 464         }
 465
 466         if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) {
 467                 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
 468                        "and a clear PE flag\n");
 469                 inject_gp(vcpu);
 470                 return;
 471         }
 472
 473         if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
 474 #ifdef CONFIG_X86_64
 475                 if ((vcpu->shadow_efer & EFER_LME)) {
 476                         int cs_db, cs_l;
 477
 478                         if (!is_pae(vcpu)) {
 479                                 printk(KERN_DEBUG "set_cr0: #GP, start paging "
 480                                        "in long mode while PAE is disabled\n");
 481                                 inject_gp(vcpu);
 482                                 return;
 483                         }
 484                         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
 485                         if (cs_l) {
 486                                 printk(KERN_DEBUG "set_cr0: #GP, start paging "
 487                                        "in long mode while CS.L == 1\n");
 488                                 inject_gp(vcpu);
 489                                 return;
 490
 491                         }
 492                 } else
 493 #endif
 494                 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
 495                         printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
 496                                "reserved bits\n");
 497                         inject_gp(vcpu);
 498                         return;
 499                 }
 500
 501         }
 502
 503         kvm_x86_ops->set_cr0(vcpu, cr0);
 504         vcpu->cr0 = cr0;
 505
 506         mutex_lock(&vcpu->kvm->lock);
 507         kvm_mmu_reset_context(vcpu);
 508         mutex_unlock(&vcpu->kvm->lock);
 509         return;
 510 }
 511 EXPORT_SYMBOL_GPL(set_cr0);
 512
 513 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
 514 {
 515         set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
 516 }
 517 EXPORT_SYMBOL_GPL(lmsw);
 518
 519 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
 520 {
 521         if (cr4 & CR4_RESERVED_BITS) {
 522                 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
 523                 inject_gp(vcpu);
 524                 return;
 525         }
 526
 527         if (is_long_mode(vcpu)) {
 528                 if (!(cr4 & X86_CR4_PAE)) {
 529                         printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
 530                                "in long mode\n");
 531                         inject_gp(vcpu);
 532                         return;
 533                 }
 534         } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & X86_CR4_PAE)
 535                    && !load_pdptrs(vcpu, vcpu->cr3)) {
 536                 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
 537                 inject_gp(vcpu);
 538                 return;
 539         }
 540
 541         if (cr4 & X86_CR4_VMXE) {
 542                 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
 543                 inject_gp(vcpu);
 544                 return;
 545         }
 546         kvm_x86_ops->set_cr4(vcpu, cr4);
 547         vcpu->cr4 = cr4;
 548         mutex_lock(&vcpu->kvm->lock);
 549         kvm_mmu_reset_context(vcpu);
 550         mutex_unlock(&vcpu->kvm->lock);
 551 }
 552 EXPORT_SYMBOL_GPL(set_cr4);
 553
 554 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
 555 {
 556         if (is_long_mode(vcpu)) {
 557                 if (cr3 & CR3_L_MODE_RESERVED_BITS) {
 558                         printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
 559                         inject_gp(vcpu);
 560                         return;
 561                 }
 562         } else {
 563                 if (is_pae(vcpu)) {
 564                         if (cr3 & CR3_PAE_RESERVED_BITS) {
 565                                 printk(KERN_DEBUG
 566                                        "set_cr3: #GP, reserved bits\n");
 567                                 inject_gp(vcpu);
 568                                 return;
 569                         }
 570                         if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) {
 571                                 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
 572                                        "reserved bits\n");
 573                                 inject_gp(vcpu);
 574                                 return;
 575                         }
 576                 } else {
 577                         if (cr3 & CR3_NONPAE_RESERVED_BITS) {
 578                                 printk(KERN_DEBUG
 579                                        "set_cr3: #GP, reserved bits\n");
 580                                 inject_gp(vcpu);
 581                                 return;
 582                         }
 583                 }
 584         }
 585
 586         mutex_lock(&vcpu->kvm->lock);
 587         /*
 588          * Does the new cr3 value map to physical memory? (Note, we
 589          * catch an invalid cr3 even in real-mode, because it would
 590          * cause trouble later on when we turn on paging anyway.)
 591          *
 592          * A real CPU would silently accept an invalid cr3 and would
 593          * attempt to use it - with largely undefined (and often hard
 594          * to debug) behavior on the guest side.
 595          */
 596         if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
 597                 inject_gp(vcpu);
 598         else {
 599                 vcpu->cr3 = cr3;
 600                 vcpu->mmu.new_cr3(vcpu);
 601         }
 602         mutex_unlock(&vcpu->kvm->lock);
 603 }
 604 EXPORT_SYMBOL_GPL(set_cr3);
 605
 606 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
 607 {
 608         if (cr8 & CR8_RESERVED_BITS) {
 609                 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
 610                 inject_gp(vcpu);
 611                 return;
 612         }
 613         if (irqchip_in_kernel(vcpu->kvm))
 614                 kvm_lapic_set_tpr(vcpu, cr8);
 615         else
 616                 vcpu->cr8 = cr8;
 617 }
 618 EXPORT_SYMBOL_GPL(set_cr8);
 619
 620 unsigned long get_cr8(struct kvm_vcpu *vcpu)
 621 {
 622         if (irqchip_in_kernel(vcpu->kvm))
 623                 return kvm_lapic_get_cr8(vcpu);
 624         else
 625                 return vcpu->cr8;
 626 }
 627 EXPORT_SYMBOL_GPL(get_cr8);
 628
 629 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
 630 {
 631         if (irqchip_in_kernel(vcpu->kvm))
 632                 return vcpu->apic_base;
 633         else
 634                 return vcpu->apic_base;
 635 }
 636 EXPORT_SYMBOL_GPL(kvm_get_apic_base);
 637
 638 void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
 639 {
 640         /* TODO: reserve bits check */
 641         if (irqchip_in_kernel(vcpu->kvm))
 642                 kvm_lapic_set_base(vcpu, data);
 643         else
 644                 vcpu->apic_base = data;
 645 }
 646 EXPORT_SYMBOL_GPL(kvm_set_apic_base);
 647
 648 void fx_init(struct kvm_vcpu *vcpu)
 649 {
 650         unsigned after_mxcsr_mask;
 651
 652         /* Initialize guest FPU by resetting ours and saving into guest's */
 653         preempt_disable();
 654         fx_save(&vcpu->host_fx_image);
 655         fpu_init();
 656         fx_save(&vcpu->guest_fx_image);
 657         fx_restore(&vcpu->host_fx_image);
 658         preempt_enable();
 659
 660         vcpu->cr0 |= X86_CR0_ET;
 661         after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
 662         vcpu->guest_fx_image.mxcsr = 0x1f80;
 663         memset((void *)&vcpu->guest_fx_image + after_mxcsr_mask,
 664                0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
 665 }
 666 EXPORT_SYMBOL_GPL(fx_init);
 667
 668 /*
 669  * Allocate some memory and give it an address in the guest physical address
 670  * space.
 671  *
 672  * Discontiguous memory is allowed, mostly for framebuffers.
 673  */
 674 static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
 675                                           struct kvm_memory_region *mem)
 676 {
 677         int r;
 678         gfn_t base_gfn;
 679         unsigned long npages;
 680         unsigned long i;
 681         struct kvm_memory_slot *memslot;
 682         struct kvm_memory_slot old, new;
 683
 684         r = -EINVAL;
 685         /* General sanity checks */
 686         if (mem->memory_size & (PAGE_SIZE - 1))
 687                 goto out;
 688         if (mem->guest_phys_addr & (PAGE_SIZE - 1))
 689                 goto out;
 690         if (mem->slot >= KVM_MEMORY_SLOTS)
 691                 goto out;
 692         if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
 693                 goto out;
 694
 695         memslot = &kvm->memslots[mem->slot];
 696         base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
 697         npages = mem->memory_size >> PAGE_SHIFT;
 698
 699         if (!npages)
 700                 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
 701
 702         mutex_lock(&kvm->lock);
 703
 704         new = old = *memslot;
 705
 706         new.base_gfn = base_gfn;
 707         new.npages = npages;
 708         new.flags = mem->flags;
 709
 710         /* Disallow changing a memory slot's size. */
 711         r = -EINVAL;
 712         if (npages && old.npages && npages != old.npages)
 713                 goto out_unlock;
 714
 715         /* Check for overlaps */
 716         r = -EEXIST;
 717         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
 718                 struct kvm_memory_slot *s = &kvm->memslots[i];
 719
 720                 if (s == memslot)
 721                         continue;
 722                 if (!((base_gfn + npages <= s->base_gfn) ||
 723                       (base_gfn >= s->base_gfn + s->npages)))
 724                         goto out_unlock;
 725         }
 726
 727         /* Deallocate if slot is being removed */
 728         if (!npages)
 729                 new.phys_mem = NULL;
 730
 731         /* Free page dirty bitmap if unneeded */
 732         if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
 733                 new.dirty_bitmap = NULL;
 734
 735         r = -ENOMEM;
 736
 737         /* Allocate if a slot is being created */
 738         if (npages && !new.phys_mem) {
 739                 new.phys_mem = vmalloc(npages * sizeof(struct page *));
 740
 741                 if (!new.phys_mem)
 742                         goto out_unlock;
 743
 744                 memset(new.phys_mem, 0, npages * sizeof(struct page *));
 745                 for (i = 0; i < npages; ++i) {
 746                         new.phys_mem[i] = alloc_page(GFP_HIGHUSER
 747                                                      | __GFP_ZERO);
 748                         if (!new.phys_mem[i])
 749                                 goto out_unlock;
 750                         set_page_private(new.phys_mem[i],0);
 751                 }
 752         }
 753
 754         /* Allocate page dirty bitmap if needed */
 755         if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
 756                 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
 757
 758                 new.dirty_bitmap = vmalloc(dirty_bytes);
 759                 if (!new.dirty_bitmap)
 760                         goto out_unlock;
 761                 memset(new.dirty_bitmap, 0, dirty_bytes);
 762         }
 763
 764         if (mem->slot >= kvm->nmemslots)
 765                 kvm->nmemslots = mem->slot + 1;
 766
 767         *memslot = new;
 768
 769         kvm_mmu_slot_remove_write_access(kvm, mem->slot);
 770         kvm_flush_remote_tlbs(kvm);
 771
 772         mutex_unlock(&kvm->lock);
 773
 774         kvm_free_physmem_slot(&old, &new);
 775         return 0;
 776
 777 out_unlock:
 778         mutex_unlock(&kvm->lock);
 779         kvm_free_physmem_slot(&new, &old);
 780 out:
 781         return r;
 782 }
 783
 784 /*
 785  * Get (and clear) the dirty memory log for a memory slot.
 786  */
 787 static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 788                                       struct kvm_dirty_log *log)
 789 {
 790         struct kvm_memory_slot *memslot;
 791         int r, i;
 792         int n;
 793         unsigned long any = 0;
 794
 795         mutex_lock(&kvm->lock);
 796
 797         r = -EINVAL;
 798         if (log->slot >= KVM_MEMORY_SLOTS)
 799                 goto out;
 800
 801         memslot = &kvm->memslots[log->slot];
 802         r = -ENOENT;
 803         if (!memslot->dirty_bitmap)
 804                 goto out;
 805
 806         n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
 807
 808         for (i = 0; !any && i < n/sizeof(long); ++i)
 809                 any = memslot->dirty_bitmap[i];
 810
 811         r = -EFAULT;
 812         if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
 813                 goto out;
 814
 815         /* If nothing is dirty, don't bother messing with page tables. */
 816         if (any) {
 817                 kvm_mmu_slot_remove_write_access(kvm, log->slot);
 818                 kvm_flush_remote_tlbs(kvm);
 819                 memset(memslot->dirty_bitmap, 0, n);
 820         }
 821
 822         r = 0;
 823
 824 out:
 825         mutex_unlock(&kvm->lock);
 826         return r;
 827 }
 828
 829 /*
 830  * Set a new alias region.  Aliases map a portion of physical memory into
 831  * another portion.  This is useful for memory windows, for example the PC
 832  * VGA region.
 833  */
 834 static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
 835                                          struct kvm_memory_alias *alias)
 836 {
 837         int r, n;
 838         struct kvm_mem_alias *p;
 839
 840         r = -EINVAL;
 841         /* General sanity checks */
 842         if (alias->memory_size & (PAGE_SIZE - 1))
 843                 goto out;
 844         if (alias->guest_phys_addr & (PAGE_SIZE - 1))
 845                 goto out;
 846         if (alias->slot >= KVM_ALIAS_SLOTS)
 847                 goto out;
 848         if (alias->guest_phys_addr + alias->memory_size
 849             < alias->guest_phys_addr)
 850                 goto out;
 851         if (alias->target_phys_addr + alias->memory_size
 852             < alias->target_phys_addr)
 853                 goto out;
 854
 855         mutex_lock(&kvm->lock);
 856
 857         p = &kvm->aliases[alias->slot];
 858         p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
 859         p->npages = alias->memory_size >> PAGE_SHIFT;
 860         p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
 861
 862         for (n = KVM_ALIAS_SLOTS; n > 0; --n)
 863                 if (kvm->aliases[n - 1].npages)
 864                         break;
 865         kvm->naliases = n;
 866
 867         kvm_mmu_zap_all(kvm);
 868
 869         mutex_unlock(&kvm->lock);
 870
 871         return 0;
 872
 873 out:
 874         return r;
 875 }
 876
 877 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
 878 {
 879         int r;
 880
 881         r = 0;
 882         switch (chip->chip_id) {
 883         case KVM_IRQCHIP_PIC_MASTER:
 884                 memcpy (&chip->chip.pic,
 885                         &pic_irqchip(kvm)->pics[0],
 886                         sizeof(struct kvm_pic_state));
 887                 break;
 888         case KVM_IRQCHIP_PIC_SLAVE:
 889                 memcpy (&chip->chip.pic,
 890                         &pic_irqchip(kvm)->pics[1],
 891                         sizeof(struct kvm_pic_state));
 892                 break;
 893         case KVM_IRQCHIP_IOAPIC:
 894                 memcpy (&chip->chip.ioapic,
 895                         ioapic_irqchip(kvm),
 896                         sizeof(struct kvm_ioapic_state));
 897                 break;
 898         default:
 899                 r = -EINVAL;
 900                 break;
 901         }
 902         return r;
 903 }
 904
 905 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
 906 {
 907         int r;
 908
 909         r = 0;
 910         switch (chip->chip_id) {
 911         case KVM_IRQCHIP_PIC_MASTER:
 912                 memcpy (&pic_irqchip(kvm)->pics[0],
 913                         &chip->chip.pic,
 914                         sizeof(struct kvm_pic_state));
 915                 break;
 916         case KVM_IRQCHIP_PIC_SLAVE:
 917                 memcpy (&pic_irqchip(kvm)->pics[1],
 918                         &chip->chip.pic,
 919                         sizeof(struct kvm_pic_state));
 920                 break;
 921         case KVM_IRQCHIP_IOAPIC:
 922                 memcpy (ioapic_irqchip(kvm),
 923                         &chip->chip.ioapic,
 924                         sizeof(struct kvm_ioapic_state));
 925                 break;
 926         default:
 927                 r = -EINVAL;
 928                 break;
 929         }
 930         kvm_pic_update_irq(pic_irqchip(kvm));
 931         return r;
 932 }
 933
 934 static gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
 935 {
 936         int i;
 937         struct kvm_mem_alias *alias;
 938
 939         for (i = 0; i < kvm->naliases; ++i) {
 940                 alias = &kvm->aliases[i];
 941                 if (gfn >= alias->base_gfn
 942                     && gfn < alias->base_gfn + alias->npages)
 943                         return alias->target_gfn + gfn - alias->base_gfn;
 944         }
 945         return gfn;
 946 }
 947
 948 static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
 949 {
 950         int i;
 951
 952         for (i = 0; i < kvm->nmemslots; ++i) {
 953                 struct kvm_memory_slot *memslot = &kvm->memslots[i];
 954
 955                 if (gfn >= memslot->base_gfn
 956                     && gfn < memslot->base_gfn + memslot->npages)
 957                         return memslot;
 958         }
 959         return NULL;
 960 }
 961
 962 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
 963 {
 964         gfn = unalias_gfn(kvm, gfn);
 965         return __gfn_to_memslot(kvm, gfn);
 966 }
 967
 968 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
 969 {
 970         struct kvm_memory_slot *slot;
 971
 972         gfn = unalias_gfn(kvm, gfn);
 973         slot = __gfn_to_memslot(kvm, gfn);
 974         if (!slot)
 975                 return NULL;
 976         return slot->phys_mem[gfn - slot->base_gfn];
 977 }
 978 EXPORT_SYMBOL_GPL(gfn_to_page);
 979
 980 /* WARNING: Does not work on aliased pages. */
 981 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
 982 {
 983         struct kvm_memory_slot *memslot;
 984
 985         memslot = __gfn_to_memslot(kvm, gfn);
 986         if (memslot && memslot->dirty_bitmap) {
 987                 unsigned long rel_gfn = gfn - memslot->base_gfn;
 988
 989                 /* avoid RMW */
 990                 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
 991                         set_bit(rel_gfn, memslot->dirty_bitmap);
 992         }
 993 }
 994
 995 int emulator_read_std(unsigned long addr,
 996                              void *val,
 997                              unsigned int bytes,
 998                              struct kvm_vcpu *vcpu)
 999 {
1000         void *data = val;
1001
1002         while (bytes) {
1003                 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1004                 unsigned offset = addr & (PAGE_SIZE-1);
1005                 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
1006                 unsigned long pfn;
1007                 struct page *page;
1008                 void *page_virt;
1009
1010                 if (gpa == UNMAPPED_GVA)
1011                         return X86EMUL_PROPAGATE_FAULT;
1012                 pfn = gpa >> PAGE_SHIFT;
1013                 page = gfn_to_page(vcpu->kvm, pfn);
1014                 if (!page)
1015                         return X86EMUL_UNHANDLEABLE;
1016                 page_virt = kmap_atomic(page, KM_USER0);
1017
1018                 memcpy(data, page_virt + offset, tocopy);
1019
1020                 kunmap_atomic(page_virt, KM_USER0);
1021
1022                 bytes -= tocopy;
1023                 data += tocopy;
1024                 addr += tocopy;
1025         }
1026
1027         return X86EMUL_CONTINUE;
1028 }
1029 EXPORT_SYMBOL_GPL(emulator_read_std);
1030
1031 static int emulator_write_std(unsigned long addr,
1032                               const void *val,
1033                               unsigned int bytes,
1034                               struct kvm_vcpu *vcpu)
1035 {
1036         pr_unimpl(vcpu, "emulator_write_std: addr %lx n %d\n", addr, bytes);
1037         return X86EMUL_UNHANDLEABLE;
1038 }
1039
1040 /*
1041  * Only apic need an MMIO device hook, so shortcut now..
1042  */
1043 static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
1044                                                 gpa_t addr)
1045 {
1046         struct kvm_io_device *dev;
1047
1048         if (vcpu->apic) {
1049                 dev = &vcpu->apic->dev;
1050                 if (dev->in_range(dev, addr))
1051                         return dev;
1052         }
1053         return NULL;
1054 }
1055
1056 static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
1057                                                 gpa_t addr)
1058 {
1059         struct kvm_io_device *dev;
1060
1061         dev = vcpu_find_pervcpu_dev(vcpu, addr);
1062         if (dev == NULL)
1063                 dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
1064         return dev;
1065 }
1066
1067 static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
1068                                                gpa_t addr)
1069 {
1070         return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
1071 }
1072
1073 static int emulator_read_emulated(unsigned long addr,
1074                                   void *val,
1075                                   unsigned int bytes,
1076                                   struct kvm_vcpu *vcpu)
1077 {
1078         struct kvm_io_device *mmio_dev;
1079         gpa_t                 gpa;
1080
1081         if (vcpu->mmio_read_completed) {
1082                 memcpy(val, vcpu->mmio_data, bytes);
1083                 vcpu->mmio_read_completed = 0;
1084                 return X86EMUL_CONTINUE;
1085         } else if (emulator_read_std(addr, val, bytes, vcpu)
1086                    == X86EMUL_CONTINUE)
1087                 return X86EMUL_CONTINUE;
1088
1089         gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1090         if (gpa == UNMAPPED_GVA)
1091                 return X86EMUL_PROPAGATE_FAULT;
1092
1093         /*
1094          * Is this MMIO handled locally?
1095          */
1096         mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1097         if (mmio_dev) {
1098                 kvm_iodevice_read(mmio_dev, gpa, bytes, val);
1099                 return X86EMUL_CONTINUE;
1100         }
1101
1102         vcpu->mmio_needed = 1;
1103         vcpu->mmio_phys_addr = gpa;
1104         vcpu->mmio_size = bytes;
1105         vcpu->mmio_is_write = 0;
1106
1107         return X86EMUL_UNHANDLEABLE;
1108 }
1109
1110 static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
1111                                const void *val, int bytes)
1112 {
1113         struct page *page;
1114         void *virt;
1115
1116         if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
1117                 return 0;
1118         page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
1119         if (!page)
1120                 return 0;
1121         mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
1122         virt = kmap_atomic(page, KM_USER0);
1123         kvm_mmu_pte_write(vcpu, gpa, val, bytes);
1124         memcpy(virt + offset_in_page(gpa), val, bytes);
1125         kunmap_atomic(virt, KM_USER0);
1126         return 1;
1127 }
1128
1129 static int emulator_write_emulated_onepage(unsigned long addr,
1130                                            const void *val,
1131                                            unsigned int bytes,
1132                                            struct kvm_vcpu *vcpu)
1133 {
1134         struct kvm_io_device *mmio_dev;
1135         gpa_t                 gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1136
1137         if (gpa == UNMAPPED_GVA) {
1138                 kvm_x86_ops->inject_page_fault(vcpu, addr, 2);
1139                 return X86EMUL_PROPAGATE_FAULT;
1140         }
1141
1142         if (emulator_write_phys(vcpu, gpa, val, bytes))
1143                 return X86EMUL_CONTINUE;
1144
1145         /*
1146          * Is this MMIO handled locally?
1147          */
1148         mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1149         if (mmio_dev) {
1150                 kvm_iodevice_write(mmio_dev, gpa, bytes, val);
1151                 return X86EMUL_CONTINUE;
1152         }
1153
1154         vcpu->mmio_needed = 1;
1155         vcpu->mmio_phys_addr = gpa;
1156         vcpu->mmio_size = bytes;
1157         vcpu->mmio_is_write = 1;
1158         memcpy(vcpu->mmio_data, val, bytes);
1159
1160         return X86EMUL_CONTINUE;
1161 }
1162
1163 int emulator_write_emulated(unsigned long addr,
1164                                    const void *val,
1165                                    unsigned int bytes,
1166                                    struct kvm_vcpu *vcpu)
1167 {
1168         /* Crossing a page boundary? */
1169         if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
1170                 int rc, now;
1171
1172                 now = -addr & ~PAGE_MASK;
1173                 rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
1174                 if (rc != X86EMUL_CONTINUE)
1175                         return rc;
1176                 addr += now;
1177                 val += now;
1178                 bytes -= now;
1179         }
1180         return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
1181 }
1182 EXPORT_SYMBOL_GPL(emulator_write_emulated);
1183
1184 static int emulator_cmpxchg_emulated(unsigned long addr,
1185                                      const void *old,
1186                                      const void *new,
1187                                      unsigned int bytes,
1188                                      struct kvm_vcpu *vcpu)
1189 {
1190         static int reported;
1191
1192         if (!reported) {
1193                 reported = 1;
1194                 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1195         }
1196         return emulator_write_emulated(addr, new, bytes, vcpu);
1197 }
1198
1199 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1200 {
1201         return kvm_x86_ops->get_segment_base(vcpu, seg);
1202 }
1203
1204 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1205 {
1206         return X86EMUL_CONTINUE;
1207 }
1208
1209 int emulate_clts(struct kvm_vcpu *vcpu)
1210 {
1211         vcpu->cr0 &= ~X86_CR0_TS;
1212         kvm_x86_ops->set_cr0(vcpu, vcpu->cr0);
1213         return X86EMUL_CONTINUE;
1214 }
1215
1216 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1217 {
1218         struct kvm_vcpu *vcpu = ctxt->vcpu;
1219
1220         switch (dr) {
1221         case 0 ... 3:
1222                 *dest = kvm_x86_ops->get_dr(vcpu, dr);
1223                 return X86EMUL_CONTINUE;
1224         default:
1225                 pr_unimpl(vcpu, "%s: unexpected dr %u\n", __FUNCTION__, dr);
1226                 return X86EMUL_UNHANDLEABLE;
1227         }
1228 }
1229
1230 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1231 {
1232         unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1233         int exception;
1234
1235         kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1236         if (exception) {
1237                 /* FIXME: better handling */
1238                 return X86EMUL_UNHANDLEABLE;
1239         }
1240         return X86EMUL_CONTINUE;
1241 }
1242
1243 static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1244 {
1245         static int reported;
1246         u8 opcodes[4];
1247         unsigned long rip = ctxt->vcpu->rip;
1248         unsigned long rip_linear;
1249
1250         rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1251
1252         if (reported)
1253                 return;
1254
1255         emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt->vcpu);
1256
1257         printk(KERN_ERR "emulation failed but !mmio_needed?"
1258                " rip %lx %02x %02x %02x %02x\n",
1259                rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1260         reported = 1;
1261 }
1262
1263 struct x86_emulate_ops emulate_ops = {
1264         .read_std            = emulator_read_std,
1265         .write_std           = emulator_write_std,
1266         .read_emulated       = emulator_read_emulated,
1267         .write_emulated      = emulator_write_emulated,
1268         .cmpxchg_emulated    = emulator_cmpxchg_emulated,
1269 };
1270
1271 int emulate_instruction(struct kvm_vcpu *vcpu,
1272                         struct kvm_run *run,
1273                         unsigned long cr2,
1274                         u16 error_code)
1275 {
1276         struct x86_emulate_ctxt emulate_ctxt;
1277         int r;
1278         int cs_db, cs_l;
1279
1280         vcpu->mmio_fault_cr2 = cr2;
1281         kvm_x86_ops->cache_regs(vcpu);
1282
1283         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1284
1285         emulate_ctxt.vcpu = vcpu;
1286         emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
1287         emulate_ctxt.cr2 = cr2;
1288         emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1289                 ? X86EMUL_MODE_REAL : cs_l
1290                 ? X86EMUL_MODE_PROT64 : cs_db
1291                 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1292
1293         if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1294                 emulate_ctxt.cs_base = 0;
1295                 emulate_ctxt.ds_base = 0;
1296                 emulate_ctxt.es_base = 0;
1297                 emulate_ctxt.ss_base = 0;
1298         } else {
1299                 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1300                 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1301                 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1302                 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1303         }
1304
1305         emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1306         emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1307
1308         vcpu->mmio_is_write = 0;
1309         vcpu->pio.string = 0;
1310         r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1311         if (vcpu->pio.string)
1312                 return EMULATE_DO_MMIO;
1313
1314         if ((r || vcpu->mmio_is_write) && run) {
1315                 run->exit_reason = KVM_EXIT_MMIO;
1316                 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1317                 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1318                 run->mmio.len = vcpu->mmio_size;
1319                 run->mmio.is_write = vcpu->mmio_is_write;
1320         }
1321
1322         if (r) {
1323                 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1324                         return EMULATE_DONE;
1325                 if (!vcpu->mmio_needed) {
1326                         report_emulation_failure(&emulate_ctxt);
1327                         return EMULATE_FAIL;
1328                 }
1329                 return EMULATE_DO_MMIO;
1330         }
1331
1332         kvm_x86_ops->decache_regs(vcpu);
1333         kvm_x86_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1334
1335         if (vcpu->mmio_is_write) {
1336                 vcpu->mmio_needed = 0;
1337                 return EMULATE_DO_MMIO;
1338         }
1339
1340         return EMULATE_DONE;
1341 }
1342 EXPORT_SYMBOL_GPL(emulate_instruction);
1343
1344 /*
1345  * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1346  */
1347 static void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1348 {
1349         DECLARE_WAITQUEUE(wait, current);
1350
1351         add_wait_queue(&vcpu->wq, &wait);
1352
1353         /*
1354          * We will block until either an interrupt or a signal wakes us up
1355          */
1356         while (!kvm_cpu_has_interrupt(vcpu)
1357                && !signal_pending(current)
1358                && vcpu->mp_state != VCPU_MP_STATE_RUNNABLE
1359                && vcpu->mp_state != VCPU_MP_STATE_SIPI_RECEIVED) {
1360                 set_current_state(TASK_INTERRUPTIBLE);
1361                 vcpu_put(vcpu);
1362                 schedule();
1363                 vcpu_load(vcpu);
1364         }
1365
1366         __set_current_state(TASK_RUNNING);
1367         remove_wait_queue(&vcpu->wq, &wait);
1368 }
1369
1370 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
1371 {
1372         ++vcpu->stat.halt_exits;
1373         if (irqchip_in_kernel(vcpu->kvm)) {
1374                 vcpu->mp_state = VCPU_MP_STATE_HALTED;
1375                 kvm_vcpu_block(vcpu);
1376                 if (vcpu->mp_state != VCPU_MP_STATE_RUNNABLE)
1377                         return -EINTR;
1378                 return 1;
1379         } else {
1380                 vcpu->run->exit_reason = KVM_EXIT_HLT;
1381                 return 0;
1382         }
1383 }
1384 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
1385
1386 int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run)
1387 {
1388         unsigned long nr, a0, a1, a2, a3, a4, a5, ret;
1389
1390         kvm_x86_ops->cache_regs(vcpu);
1391         ret = -KVM_EINVAL;
1392 #ifdef CONFIG_X86_64
1393         if (is_long_mode(vcpu)) {
1394                 nr = vcpu->regs[VCPU_REGS_RAX];
1395                 a0 = vcpu->regs[VCPU_REGS_RDI];
1396                 a1 = vcpu->regs[VCPU_REGS_RSI];
1397                 a2 = vcpu->regs[VCPU_REGS_RDX];
1398                 a3 = vcpu->regs[VCPU_REGS_RCX];
1399                 a4 = vcpu->regs[VCPU_REGS_R8];
1400                 a5 = vcpu->regs[VCPU_REGS_R9];
1401         } else
1402 #endif
1403         {
1404                 nr = vcpu->regs[VCPU_REGS_RBX] & -1u;
1405                 a0 = vcpu->regs[VCPU_REGS_RAX] & -1u;
1406                 a1 = vcpu->regs[VCPU_REGS_RCX] & -1u;
1407                 a2 = vcpu->regs[VCPU_REGS_RDX] & -1u;
1408                 a3 = vcpu->regs[VCPU_REGS_RSI] & -1u;
1409                 a4 = vcpu->regs[VCPU_REGS_RDI] & -1u;
1410                 a5 = vcpu->regs[VCPU_REGS_RBP] & -1u;
1411         }
1412         switch (nr) {
1413         default:
1414                 run->hypercall.nr = nr;
1415                 run->hypercall.args[0] = a0;
1416                 run->hypercall.args[1] = a1;
1417                 run->hypercall.args[2] = a2;
1418                 run->hypercall.args[3] = a3;
1419                 run->hypercall.args[4] = a4;
1420                 run->hypercall.args[5] = a5;
1421                 run->hypercall.ret = ret;
1422                 run->hypercall.longmode = is_long_mode(vcpu);
1423                 kvm_x86_ops->decache_regs(vcpu);
1424                 return 0;
1425         }
1426         vcpu->regs[VCPU_REGS_RAX] = ret;
1427         kvm_x86_ops->decache_regs(vcpu);
1428         return 1;
1429 }
1430 EXPORT_SYMBOL_GPL(kvm_hypercall);
1431
1432 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1433 {
1434         return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1435 }
1436
1437 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1438 {
1439         struct descriptor_table dt = { limit, base };
1440
1441         kvm_x86_ops->set_gdt(vcpu, &dt);
1442 }
1443
1444 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1445 {
1446         struct descriptor_table dt = { limit, base };
1447
1448         kvm_x86_ops->set_idt(vcpu, &dt);
1449 }
1450
1451 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1452                    unsigned long *rflags)
1453 {
1454         lmsw(vcpu, msw);
1455         *rflags = kvm_x86_ops->get_rflags(vcpu);
1456 }
1457
1458 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1459 {
1460         kvm_x86_ops->decache_cr4_guest_bits(vcpu);
1461         switch (cr) {
1462         case 0:
1463                 return vcpu->cr0;
1464         case 2:
1465                 return vcpu->cr2;
1466         case 3:
1467                 return vcpu->cr3;
1468         case 4:
1469                 return vcpu->cr4;
1470         default:
1471                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1472                 return 0;
1473         }
1474 }
1475
1476 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1477                      unsigned long *rflags)
1478 {
1479         switch (cr) {
1480         case 0:
1481                 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1482                 *rflags = kvm_x86_ops->get_rflags(vcpu);
1483                 break;
1484         case 2:
1485                 vcpu->cr2 = val;
1486                 break;
1487         case 3:
1488                 set_cr3(vcpu, val);
1489                 break;
1490         case 4:
1491                 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1492                 break;
1493         default:
1494                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1495         }
1496 }
1497
1498 /*
1499  * Register the para guest with the host:
1500  */
1501 static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa)
1502 {
1503         struct kvm_vcpu_para_state *para_state;
1504         hpa_t para_state_hpa, hypercall_hpa;
1505         struct page *para_state_page;
1506         unsigned char *hypercall;
1507         gpa_t hypercall_gpa;
1508
1509         printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n");
1510         printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa);
1511
1512         /*
1513          * Needs to be page aligned:
1514          */
1515         if (para_state_gpa != PAGE_ALIGN(para_state_gpa))
1516                 goto err_gp;
1517
1518         para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa);
1519         printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa);
1520         if (is_error_hpa(para_state_hpa))
1521                 goto err_gp;
1522
1523         mark_page_dirty(vcpu->kvm, para_state_gpa >> PAGE_SHIFT);
1524         para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT);
1525         para_state = kmap(para_state_page);
1526
1527         printk(KERN_DEBUG "....  guest version: %d\n", para_state->guest_version);
1528         printk(KERN_DEBUG "....           size: %d\n", para_state->size);
1529
1530         para_state->host_version = KVM_PARA_API_VERSION;
1531         /*
1532          * We cannot support guests that try to register themselves
1533          * with a newer API version than the host supports:
1534          */
1535         if (para_state->guest_version > KVM_PARA_API_VERSION) {
1536                 para_state->ret = -KVM_EINVAL;
1537                 goto err_kunmap_skip;
1538         }
1539
1540         hypercall_gpa = para_state->hypercall_gpa;
1541         hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa);
1542         printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa);
1543         if (is_error_hpa(hypercall_hpa)) {
1544                 para_state->ret = -KVM_EINVAL;
1545                 goto err_kunmap_skip;
1546         }
1547
1548         printk(KERN_DEBUG "kvm: para guest successfully registered.\n");
1549         vcpu->para_state_page = para_state_page;
1550         vcpu->para_state_gpa = para_state_gpa;
1551         vcpu->hypercall_gpa = hypercall_gpa;
1552
1553         mark_page_dirty(vcpu->kvm, hypercall_gpa >> PAGE_SHIFT);
1554         hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT),
1555                                 KM_USER1) + (hypercall_hpa & ~PAGE_MASK);
1556         kvm_x86_ops->patch_hypercall(vcpu, hypercall);
1557         kunmap_atomic(hypercall, KM_USER1);
1558
1559         para_state->ret = 0;
1560 err_kunmap_skip:
1561         kunmap(para_state_page);
1562         return 0;
1563 err_gp:
1564         return 1;
1565 }
1566
1567 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1568 {
1569         u64 data;
1570
1571         switch (msr) {
1572         case 0xc0010010: /* SYSCFG */
1573         case 0xc0010015: /* HWCR */
1574         case MSR_IA32_PLATFORM_ID:
1575         case MSR_IA32_P5_MC_ADDR:
1576         case MSR_IA32_P5_MC_TYPE:
1577         case MSR_IA32_MC0_CTL:
1578         case MSR_IA32_MCG_STATUS:
1579         case MSR_IA32_MCG_CAP:
1580         case MSR_IA32_MC0_MISC:
1581         case MSR_IA32_MC0_MISC+4:
1582         case MSR_IA32_MC0_MISC+8:
1583         case MSR_IA32_MC0_MISC+12:
1584         case MSR_IA32_MC0_MISC+16:
1585         case MSR_IA32_UCODE_REV:
1586         case MSR_IA32_PERF_STATUS:
1587         case MSR_IA32_EBL_CR_POWERON:
1588                 /* MTRR registers */
1589         case 0xfe:
1590         case 0x200 ... 0x2ff:
1591                 data = 0;
1592                 break;
1593         case 0xcd: /* fsb frequency */
1594                 data = 3;
1595                 break;
1596         case MSR_IA32_APICBASE:
1597                 data = kvm_get_apic_base(vcpu);
1598                 break;
1599         case MSR_IA32_MISC_ENABLE:
1600                 data = vcpu->ia32_misc_enable_msr;
1601                 break;
1602 #ifdef CONFIG_X86_64
1603         case MSR_EFER:
1604                 data = vcpu->shadow_efer;
1605                 break;
1606 #endif
1607         default:
1608                 pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
1609                 return 1;
1610         }
1611         *pdata = data;
1612         return 0;
1613 }
1614 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1615
1616 /*
1617  * Reads an msr value (of 'msr_index') into 'pdata'.
1618  * Returns 0 on success, non-0 otherwise.
1619  * Assumes vcpu_load() was already called.
1620  */
1621 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1622 {
1623         return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
1624 }
1625
1626 #ifdef CONFIG_X86_64
1627
1628 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
1629 {
1630         if (efer & EFER_RESERVED_BITS) {
1631                 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1632                        efer);
1633                 inject_gp(vcpu);
1634                 return;
1635         }
1636
1637         if (is_paging(vcpu)
1638             && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1639                 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1640                 inject_gp(vcpu);
1641                 return;
1642         }
1643
1644         kvm_x86_ops->set_efer(vcpu, efer);
1645
1646         efer &= ~EFER_LMA;
1647         efer |= vcpu->shadow_efer & EFER_LMA;
1648
1649         vcpu->shadow_efer = efer;
1650 }
1651
1652 #endif
1653
1654 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1655 {
1656         switch (msr) {
1657 #ifdef CONFIG_X86_64
1658         case MSR_EFER:
1659                 set_efer(vcpu, data);
1660                 break;
1661 #endif
1662         case MSR_IA32_MC0_STATUS:
1663                 pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1664                        __FUNCTION__, data);
1665                 break;
1666         case MSR_IA32_MCG_STATUS:
1667                 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
1668                         __FUNCTION__, data);
1669                 break;
1670         case MSR_IA32_UCODE_REV:
1671         case MSR_IA32_UCODE_WRITE:
1672         case 0x200 ... 0x2ff: /* MTRRs */
1673                 break;
1674         case MSR_IA32_APICBASE:
1675                 kvm_set_apic_base(vcpu, data);
1676                 break;
1677         case MSR_IA32_MISC_ENABLE:
1678                 vcpu->ia32_misc_enable_msr = data;
1679                 break;
1680         /*
1681          * This is the 'probe whether the host is KVM' logic:
1682          */
1683         case MSR_KVM_API_MAGIC:
1684                 return vcpu_register_para(vcpu, data);
1685
1686         default:
1687                 pr_unimpl(vcpu, "unhandled wrmsr: 0x%x\n", msr);
1688                 return 1;
1689         }
1690         return 0;
1691 }
1692 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1693
1694 /*
1695  * Writes msr value into into the appropriate "register".
1696  * Returns 0 on success, non-0 otherwise.
1697  * Assumes vcpu_load() was already called.
1698  */
1699 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1700 {
1701         return kvm_x86_ops->set_msr(vcpu, msr_index, data);
1702 }
1703
1704 void kvm_resched(struct kvm_vcpu *vcpu)
1705 {
1706         if (!need_resched())
1707                 return;
1708         cond_resched();
1709 }
1710 EXPORT_SYMBOL_GPL(kvm_resched);
1711
1712 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
1713 {
1714         int i;
1715         u32 function;
1716         struct kvm_cpuid_entry *e, *best;
1717
1718         kvm_x86_ops->cache_regs(vcpu);
1719         function = vcpu->regs[VCPU_REGS_RAX];
1720         vcpu->regs[VCPU_REGS_RAX] = 0;
1721         vcpu->regs[VCPU_REGS_RBX] = 0;
1722         vcpu->regs[VCPU_REGS_RCX] = 0;
1723         vcpu->regs[VCPU_REGS_RDX] = 0;
1724         best = NULL;
1725         for (i = 0; i < vcpu->cpuid_nent; ++i) {
1726                 e = &vcpu->cpuid_entries[i];
1727                 if (e->function == function) {
1728                         best = e;
1729                         break;
1730                 }
1731                 /*
1732                  * Both basic or both extended?
1733                  */
1734                 if (((e->function ^ function) & 0x80000000) == 0)
1735                         if (!best || e->function > best->function)
1736                                 best = e;
1737         }
1738         if (best) {
1739                 vcpu->regs[VCPU_REGS_RAX] = best->eax;
1740                 vcpu->regs[VCPU_REGS_RBX] = best->ebx;
1741                 vcpu->regs[VCPU_REGS_RCX] = best->ecx;
1742                 vcpu->regs[VCPU_REGS_RDX] = best->edx;
1743         }
1744         kvm_x86_ops->decache_regs(vcpu);
1745         kvm_x86_ops->skip_emulated_instruction(vcpu);
1746 }
1747 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
1748
1749 static int pio_copy_data(struct kvm_vcpu *vcpu)
1750 {
1751         void *p = vcpu->pio_data;
1752         void *q;
1753         unsigned bytes;
1754         int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
1755
1756         q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
1757                  PAGE_KERNEL);
1758         if (!q) {
1759                 free_pio_guest_pages(vcpu);
1760                 return -ENOMEM;
1761         }
1762         q += vcpu->pio.guest_page_offset;
1763         bytes = vcpu->pio.size * vcpu->pio.cur_count;
1764         if (vcpu->pio.in)
1765                 memcpy(q, p, bytes);
1766         else
1767                 memcpy(p, q, bytes);
1768         q -= vcpu->pio.guest_page_offset;
1769         vunmap(q);
1770         free_pio_guest_pages(vcpu);
1771         return 0;
1772 }
1773
1774 static int complete_pio(struct kvm_vcpu *vcpu)
1775 {
1776         struct kvm_pio_request *io = &vcpu->pio;
1777         long delta;
1778         int r;
1779
1780         kvm_x86_ops->cache_regs(vcpu);
1781
1782         if (!io->string) {
1783                 if (io->in)
1784                         memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
1785                                io->size);
1786         } else {
1787                 if (io->in) {
1788                         r = pio_copy_data(vcpu);
1789                         if (r) {
1790                                 kvm_x86_ops->cache_regs(vcpu);
1791                                 return r;
1792                         }
1793                 }
1794
1795                 delta = 1;
1796                 if (io->rep) {
1797                         delta *= io->cur_count;
1798                         /*
1799                          * The size of the register should really depend on
1800                          * current address size.
1801                          */
1802                         vcpu->regs[VCPU_REGS_RCX] -= delta;
1803                 }
1804                 if (io->down)
1805                         delta = -delta;
1806                 delta *= io->size;
1807                 if (io->in)
1808                         vcpu->regs[VCPU_REGS_RDI] += delta;
1809                 else
1810                         vcpu->regs[VCPU_REGS_RSI] += delta;
1811         }
1812
1813         kvm_x86_ops->decache_regs(vcpu);
1814
1815         io->count -= io->cur_count;
1816         io->cur_count = 0;
1817
1818         if (!io->count)
1819                 kvm_x86_ops->skip_emulated_instruction(vcpu);
1820         return 0;
1821 }
1822
1823 static void kernel_pio(struct kvm_io_device *pio_dev,
1824                        struct kvm_vcpu *vcpu,
1825                        void *pd)
1826 {
1827         /* TODO: String I/O for in kernel device */
1828
1829         mutex_lock(&vcpu->kvm->lock);
1830         if (vcpu->pio.in)
1831                 kvm_iodevice_read(pio_dev, vcpu->pio.port,
1832                                   vcpu->pio.size,
1833                                   pd);
1834         else
1835                 kvm_iodevice_write(pio_dev, vcpu->pio.port,
1836                                    vcpu->pio.size,
1837                                    pd);
1838         mutex_unlock(&vcpu->kvm->lock);
1839 }
1840
1841 static void pio_string_write(struct kvm_io_device *pio_dev,
1842                              struct kvm_vcpu *vcpu)
1843 {
1844         struct kvm_pio_request *io = &vcpu->pio;
1845         void *pd = vcpu->pio_data;
1846         int i;
1847
1848         mutex_lock(&vcpu->kvm->lock);
1849         for (i = 0; i < io->cur_count; i++) {
1850                 kvm_iodevice_write(pio_dev, io->port,
1851                                    io->size,
1852                                    pd);
1853                 pd += io->size;
1854         }
1855         mutex_unlock(&vcpu->kvm->lock);
1856 }
1857
1858 int kvm_emulate_pio (struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1859                   int size, unsigned port)
1860 {
1861         struct kvm_io_device *pio_dev;
1862
1863         vcpu->run->exit_reason = KVM_EXIT_IO;
1864         vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1865         vcpu->run->io.size = vcpu->pio.size = size;
1866         vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1867         vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = 1;
1868         vcpu->run->io.port = vcpu->pio.port = port;
1869         vcpu->pio.in = in;
1870         vcpu->pio.string = 0;
1871         vcpu->pio.down = 0;
1872         vcpu->pio.guest_page_offset = 0;
1873         vcpu->pio.rep = 0;
1874
1875         kvm_x86_ops->cache_regs(vcpu);
1876         memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
1877         kvm_x86_ops->decache_regs(vcpu);
1878
1879         pio_dev = vcpu_find_pio_dev(vcpu, port);
1880         if (pio_dev) {
1881                 kernel_pio(pio_dev, vcpu, vcpu->pio_data);
1882                 complete_pio(vcpu);
1883                 return 1;
1884         }
1885         return 0;
1886 }
1887 EXPORT_SYMBOL_GPL(kvm_emulate_pio);
1888
1889 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1890                   int size, unsigned long count, int down,
1891                   gva_t address, int rep, unsigned port)
1892 {
1893         unsigned now, in_page;
1894         int i, ret = 0;
1895         int nr_pages = 1;
1896         struct page *page;
1897         struct kvm_io_device *pio_dev;
1898
1899         vcpu->run->exit_reason = KVM_EXIT_IO;
1900         vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1901         vcpu->run->io.size = vcpu->pio.size = size;
1902         vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1903         vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = count;
1904         vcpu->run->io.port = vcpu->pio.port = port;
1905         vcpu->pio.in = in;
1906         vcpu->pio.string = 1;
1907         vcpu->pio.down = down;
1908         vcpu->pio.guest_page_offset = offset_in_page(address);
1909         vcpu->pio.rep = rep;
1910
1911         if (!count) {
1912                 kvm_x86_ops->skip_emulated_instruction(vcpu);
1913                 return 1;
1914         }
1915
1916         if (!down)
1917                 in_page = PAGE_SIZE - offset_in_page(address);
1918         else
1919                 in_page = offset_in_page(address) + size;
1920         now = min(count, (unsigned long)in_page / size);
1921         if (!now) {
1922                 /*
1923                  * String I/O straddles page boundary.  Pin two guest pages
1924                  * so that we satisfy atomicity constraints.  Do just one
1925                  * transaction to avoid complexity.
1926                  */
1927                 nr_pages = 2;
1928                 now = 1;
1929         }
1930         if (down) {
1931                 /*
1932                  * String I/O in reverse.  Yuck.  Kill the guest, fix later.
1933                  */
1934                 pr_unimpl(vcpu, "guest string pio down\n");
1935                 inject_gp(vcpu);
1936                 return 1;
1937         }
1938         vcpu->run->io.count = now;
1939         vcpu->pio.cur_count = now;
1940
1941         for (i = 0; i < nr_pages; ++i) {
1942                 mutex_lock(&vcpu->kvm->lock);
1943                 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
1944                 if (page)
1945                         get_page(page);
1946                 vcpu->pio.guest_pages[i] = page;
1947                 mutex_unlock(&vcpu->kvm->lock);
1948                 if (!page) {
1949                         inject_gp(vcpu);
1950                         free_pio_guest_pages(vcpu);
1951                         return 1;
1952                 }
1953         }
1954
1955         pio_dev = vcpu_find_pio_dev(vcpu, port);
1956         if (!vcpu->pio.in) {
1957                 /* string PIO write */
1958                 ret = pio_copy_data(vcpu);
1959                 if (ret >= 0 && pio_dev) {
1960                         pio_string_write(pio_dev, vcpu);
1961                         complete_pio(vcpu);
1962                         if (vcpu->pio.count == 0)
1963                                 ret = 1;
1964                 }
1965         } else if (pio_dev)
1966                 pr_unimpl(vcpu, "no string pio read support yet, "
1967                        "port %x size %d count %ld\n",
1968                         port, size, count);
1969
1970         return ret;
1971 }
1972 EXPORT_SYMBOL_GPL(kvm_emulate_pio_string);
1973
1974 /*
1975  * Check if userspace requested an interrupt window, and that the
1976  * interrupt window is open.
1977  *
1978  * No need to exit to userspace if we already have an interrupt queued.
1979  */
1980 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu,
1981                                           struct kvm_run *kvm_run)
1982 {
1983         return (!vcpu->irq_summary &&
1984                 kvm_run->request_interrupt_window &&
1985                 vcpu->interrupt_window_open &&
1986                 (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF));
1987 }
1988
1989 static void post_kvm_run_save(struct kvm_vcpu *vcpu,
1990                               struct kvm_run *kvm_run)
1991 {
1992         kvm_run->if_flag = (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
1993         kvm_run->cr8 = get_cr8(vcpu);
1994         kvm_run->apic_base = kvm_get_apic_base(vcpu);
1995         if (irqchip_in_kernel(vcpu->kvm))
1996                 kvm_run->ready_for_interrupt_injection = 1;
1997         else
1998                 kvm_run->ready_for_interrupt_injection =
1999                                         (vcpu->interrupt_window_open &&
2000                                          vcpu->irq_summary == 0);
2001 }
2002
2003 static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2004 {
2005         int r;
2006
2007         if (unlikely(vcpu->mp_state == VCPU_MP_STATE_SIPI_RECEIVED)) {
2008                 printk("vcpu %d received sipi with vector # %x\n",
2009                        vcpu->vcpu_id, vcpu->sipi_vector);
2010                 kvm_lapic_reset(vcpu);
2011                 kvm_x86_ops->vcpu_reset(vcpu);
2012                 vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
2013         }
2014
2015 preempted:
2016         if (vcpu->guest_debug.enabled)
2017                 kvm_x86_ops->guest_debug_pre(vcpu);
2018
2019 again:
2020         r = kvm_mmu_reload(vcpu);
2021         if (unlikely(r))
2022                 goto out;
2023
2024         preempt_disable();
2025
2026         kvm_x86_ops->prepare_guest_switch(vcpu);
2027         kvm_load_guest_fpu(vcpu);
2028
2029         local_irq_disable();
2030
2031         if (signal_pending(current)) {
2032                 local_irq_enable();
2033                 preempt_enable();
2034                 r = -EINTR;
2035                 kvm_run->exit_reason = KVM_EXIT_INTR;
2036                 ++vcpu->stat.signal_exits;
2037                 goto out;
2038         }
2039
2040         if (irqchip_in_kernel(vcpu->kvm))
2041                 kvm_x86_ops->inject_pending_irq(vcpu);
2042         else if (!vcpu->mmio_read_completed)
2043                 kvm_x86_ops->inject_pending_vectors(vcpu, kvm_run);
2044
2045         vcpu->guest_mode = 1;
2046
2047         if (vcpu->requests)
2048                 if (test_and_clear_bit(KVM_TLB_FLUSH, &vcpu->requests))
2049                         kvm_x86_ops->tlb_flush(vcpu);
2050
2051         kvm_x86_ops->run(vcpu, kvm_run);
2052
2053         vcpu->guest_mode = 0;
2054         local_irq_enable();
2055
2056         ++vcpu->stat.exits;
2057
2058         preempt_enable();
2059
2060         /*
2061          * Profile KVM exit RIPs:
2062          */
2063         if (unlikely(prof_on == KVM_PROFILING)) {
2064                 kvm_x86_ops->cache_regs(vcpu);
2065                 profile_hit(KVM_PROFILING, (void *)vcpu->rip);
2066         }
2067
2068         r = kvm_x86_ops->handle_exit(kvm_run, vcpu);
2069
2070         if (r > 0) {
2071                 if (dm_request_for_irq_injection(vcpu, kvm_run)) {
2072                         r = -EINTR;
2073                         kvm_run->exit_reason = KVM_EXIT_INTR;
2074                         ++vcpu->stat.request_irq_exits;
2075                         goto out;
2076                 }
2077                 if (!need_resched()) {
2078                         ++vcpu->stat.light_exits;
2079                         goto again;
2080                 }
2081         }
2082
2083 out:
2084         if (r > 0) {
2085                 kvm_resched(vcpu);
2086                 goto preempted;
2087         }
2088
2089         post_kvm_run_save(vcpu, kvm_run);
2090
2091         return r;
2092 }
2093
2094
2095 static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2096 {
2097         int r;
2098         sigset_t sigsaved;
2099
2100         vcpu_load(vcpu);
2101
2102         if (unlikely(vcpu->mp_state == VCPU_MP_STATE_UNINITIALIZED)) {
2103                 kvm_vcpu_block(vcpu);
2104                 vcpu_put(vcpu);
2105                 return -EAGAIN;
2106         }
2107
2108         if (vcpu->sigset_active)
2109                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
2110
2111         /* re-sync apic's tpr */
2112         if (!irqchip_in_kernel(vcpu->kvm))
2113                 set_cr8(vcpu, kvm_run->cr8);
2114
2115         if (vcpu->pio.cur_count) {
2116                 r = complete_pio(vcpu);
2117                 if (r)
2118                         goto out;
2119         }
2120
2121         if (vcpu->mmio_needed) {
2122                 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
2123                 vcpu->mmio_read_completed = 1;
2124                 vcpu->mmio_needed = 0;
2125                 r = emulate_instruction(vcpu, kvm_run,
2126                                         vcpu->mmio_fault_cr2, 0);
2127                 if (r == EMULATE_DO_MMIO) {
2128                         /*
2129                          * Read-modify-write.  Back to userspace.
2130                          */
2131                         r = 0;
2132                         goto out;
2133                 }
2134         }
2135
2136         if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
2137                 kvm_x86_ops->cache_regs(vcpu);
2138                 vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
2139                 kvm_x86_ops->decache_regs(vcpu);
2140         }
2141
2142         r = __vcpu_run(vcpu, kvm_run);
2143
2144 out:
2145         if (vcpu->sigset_active)
2146                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2147
2148         vcpu_put(vcpu);
2149         return r;
2150 }
2151
2152 static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
2153                                    struct kvm_regs *regs)
2154 {
2155         vcpu_load(vcpu);
2156
2157         kvm_x86_ops->cache_regs(vcpu);
2158
2159         regs->rax = vcpu->regs[VCPU_REGS_RAX];
2160         regs->rbx = vcpu->regs[VCPU_REGS_RBX];
2161         regs->rcx = vcpu->regs[VCPU_REGS_RCX];
2162         regs->rdx = vcpu->regs[VCPU_REGS_RDX];
2163         regs->rsi = vcpu->regs[VCPU_REGS_RSI];
2164         regs->rdi = vcpu->regs[VCPU_REGS_RDI];
2165         regs->rsp = vcpu->regs[VCPU_REGS_RSP];
2166         regs->rbp = vcpu->regs[VCPU_REGS_RBP];
2167 #ifdef CONFIG_X86_64
2168         regs->r8 = vcpu->regs[VCPU_REGS_R8];
2169         regs->r9 = vcpu->regs[VCPU_REGS_R9];
2170         regs->r10 = vcpu->regs[VCPU_REGS_R10];
2171         regs->r11 = vcpu->regs[VCPU_REGS_R11];
2172         regs->r12 = vcpu->regs[VCPU_REGS_R12];
2173         regs->r13 = vcpu->regs[VCPU_REGS_R13];
2174         regs->r14 = vcpu->regs[VCPU_REGS_R14];
2175         regs->r15 = vcpu->regs[VCPU_REGS_R15];
2176 #endif
2177
2178         regs->rip = vcpu->rip;
2179         regs->rflags = kvm_x86_ops->get_rflags(vcpu);
2180
2181         /*
2182          * Don't leak debug flags in case they were set for guest debugging
2183          */
2184         if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
2185                 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
2186
2187         vcpu_put(vcpu);
2188
2189         return 0;
2190 }
2191
2192 static int kvm_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
2193                                    struct kvm_regs *regs)
2194 {
2195         vcpu_load(vcpu);
2196
2197         vcpu->regs[VCPU_REGS_RAX] = regs->rax;
2198         vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
2199         vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
2200         vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
2201         vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
2202         vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
2203         vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
2204         vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
2205 #ifdef CONFIG_X86_64
2206         vcpu->regs[VCPU_REGS_R8] = regs->r8;
2207         vcpu->regs[VCPU_REGS_R9] = regs->r9;
2208         vcpu->regs[VCPU_REGS_R10] = regs->r10;
2209         vcpu->regs[VCPU_REGS_R11] = regs->r11;
2210         vcpu->regs[VCPU_REGS_R12] = regs->r12;
2211         vcpu->regs[VCPU_REGS_R13] = regs->r13;
2212         vcpu->regs[VCPU_REGS_R14] = regs->r14;
2213         vcpu->regs[VCPU_REGS_R15] = regs->r15;
2214 #endif
2215
2216         vcpu->rip = regs->rip;
2217         kvm_x86_ops->set_rflags(vcpu, regs->rflags);
2218
2219         kvm_x86_ops->decache_regs(vcpu);
2220
2221         vcpu_put(vcpu);
2222
2223         return 0;
2224 }
2225
2226 static void get_segment(struct kvm_vcpu *vcpu,
2227                         struct kvm_segment *var, int seg)
2228 {
2229         return kvm_x86_ops->get_segment(vcpu, var, seg);
2230 }
2231
2232 static int kvm_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
2233                                     struct kvm_sregs *sregs)
2234 {
2235         struct descriptor_table dt;
2236         int pending_vec;
2237
2238         vcpu_load(vcpu);
2239
2240         get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2241         get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2242         get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2243         get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2244         get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2245         get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2246
2247         get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2248         get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2249
2250         kvm_x86_ops->get_idt(vcpu, &dt);
2251         sregs->idt.limit = dt.limit;
2252         sregs->idt.base = dt.base;
2253         kvm_x86_ops->get_gdt(vcpu, &dt);
2254         sregs->gdt.limit = dt.limit;
2255         sregs->gdt.base = dt.base;
2256
2257         kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2258         sregs->cr0 = vcpu->cr0;
2259         sregs->cr2 = vcpu->cr2;
2260         sregs->cr3 = vcpu->cr3;
2261         sregs->cr4 = vcpu->cr4;
2262         sregs->cr8 = get_cr8(vcpu);
2263         sregs->efer = vcpu->shadow_efer;
2264         sregs->apic_base = kvm_get_apic_base(vcpu);
2265
2266         if (irqchip_in_kernel(vcpu->kvm)) {
2267                 memset(sregs->interrupt_bitmap, 0,
2268                        sizeof sregs->interrupt_bitmap);
2269                 pending_vec = kvm_x86_ops->get_irq(vcpu);
2270                 if (pending_vec >= 0)
2271                         set_bit(pending_vec, (unsigned long *)sregs->interrupt_bitmap);
2272         } else
2273                 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
2274                        sizeof sregs->interrupt_bitmap);
2275
2276         vcpu_put(vcpu);
2277
2278         return 0;
2279 }
2280
2281 static void set_segment(struct kvm_vcpu *vcpu,
2282                         struct kvm_segment *var, int seg)
2283 {
2284         return kvm_x86_ops->set_segment(vcpu, var, seg);
2285 }
2286
2287 static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2288                                     struct kvm_sregs *sregs)
2289 {
2290         int mmu_reset_needed = 0;
2291         int i, pending_vec, max_bits;
2292         struct descriptor_table dt;
2293
2294         vcpu_load(vcpu);
2295
2296         dt.limit = sregs->idt.limit;
2297         dt.base = sregs->idt.base;
2298         kvm_x86_ops->set_idt(vcpu, &dt);
2299         dt.limit = sregs->gdt.limit;
2300         dt.base = sregs->gdt.base;
2301         kvm_x86_ops->set_gdt(vcpu, &dt);
2302
2303         vcpu->cr2 = sregs->cr2;
2304         mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
2305         vcpu->cr3 = sregs->cr3;
2306
2307         set_cr8(vcpu, sregs->cr8);
2308
2309         mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
2310 #ifdef CONFIG_X86_64
2311         kvm_x86_ops->set_efer(vcpu, sregs->efer);
2312 #endif
2313         kvm_set_apic_base(vcpu, sregs->apic_base);
2314
2315         kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2316
2317         mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
2318         vcpu->cr0 = sregs->cr0;
2319         kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
2320
2321         mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
2322         kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
2323         if (!is_long_mode(vcpu) && is_pae(vcpu))
2324                 load_pdptrs(vcpu, vcpu->cr3);
2325
2326         if (mmu_reset_needed)
2327                 kvm_mmu_reset_context(vcpu);
2328
2329         if (!irqchip_in_kernel(vcpu->kvm)) {
2330                 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
2331                        sizeof vcpu->irq_pending);
2332                 vcpu->irq_summary = 0;
2333                 for (i = 0; i < ARRAY_SIZE(vcpu->irq_pending); ++i)
2334                         if (vcpu->irq_pending[i])
2335                                 __set_bit(i, &vcpu->irq_summary);
2336         } else {
2337                 max_bits = (sizeof sregs->interrupt_bitmap) << 3;
2338                 pending_vec = find_first_bit(
2339                         (const unsigned long *)sregs->interrupt_bitmap,
2340                         max_bits);
2341                 /* Only pending external irq is handled here */
2342                 if (pending_vec < max_bits) {
2343                         kvm_x86_ops->set_irq(vcpu, pending_vec);
2344                         printk("Set back pending irq %d\n", pending_vec);
2345                 }
2346         }
2347
2348         set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2349         set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2350         set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2351         set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2352         set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2353         set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2354
2355         set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2356         set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2357
2358         vcpu_put(vcpu);
2359
2360         return 0;
2361 }
2362
2363 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
2364 {
2365         struct kvm_segment cs;
2366
2367         get_segment(vcpu, &cs, VCPU_SREG_CS);
2368         *db = cs.db;
2369         *l = cs.l;
2370 }
2371 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
2372
2373 /*
2374  * List of msr numbers which we expose to userspace through KVM_GET_MSRS
2375  * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
2376  *
2377  * This list is modified at module load time to reflect the
2378  * capabilities of the host cpu.
2379  */
2380 static u32 msrs_to_save[] = {
2381         MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
2382         MSR_K6_STAR,
2383 #ifdef CONFIG_X86_64
2384         MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
2385 #endif
2386         MSR_IA32_TIME_STAMP_COUNTER,
2387 };
2388
2389 static unsigned num_msrs_to_save;
2390
2391 static u32 emulated_msrs[] = {
2392         MSR_IA32_MISC_ENABLE,
2393 };
2394
2395 static __init void kvm_init_msr_list(void)
2396 {
2397         u32 dummy[2];
2398         unsigned i, j;
2399
2400         for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
2401                 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
2402                         continue;
2403                 if (j < i)
2404                         msrs_to_save[j] = msrs_to_save[i];
2405                 j++;
2406         }
2407         num_msrs_to_save = j;
2408 }
2409
2410 /*
2411  * Adapt set_msr() to msr_io()'s calling convention
2412  */
2413 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
2414 {
2415         return kvm_set_msr(vcpu, index, *data);
2416 }
2417
2418 /*
2419  * Read or write a bunch of msrs. All parameters are kernel addresses.
2420  *
2421  * @return number of msrs set successfully.
2422  */
2423 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
2424                     struct kvm_msr_entry *entries,
2425                     int (*do_msr)(struct kvm_vcpu *vcpu,
2426                                   unsigned index, u64 *data))
2427 {
2428         int i;
2429
2430         vcpu_load(vcpu);
2431
2432         for (i = 0; i < msrs->nmsrs; ++i)
2433                 if (do_msr(vcpu, entries[i].index, &entries[i].data))
2434                         break;
2435
2436         vcpu_put(vcpu);
2437
2438         return i;
2439 }
2440
2441 /*
2442  * Read or write a bunch of msrs. Parameters are user addresses.
2443  *
2444  * @return number of msrs set successfully.
2445  */
2446 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
2447                   int (*do_msr)(struct kvm_vcpu *vcpu,
2448                                 unsigned index, u64 *data),
2449                   int writeback)
2450 {
2451         struct kvm_msrs msrs;
2452         struct kvm_msr_entry *entries;
2453         int r, n;
2454         unsigned size;
2455
2456         r = -EFAULT;
2457         if (copy_from_user(&msrs, user_msrs, sizeof msrs))
2458                 goto out;
2459
2460         r = -E2BIG;
2461         if (msrs.nmsrs >= MAX_IO_MSRS)
2462                 goto out;
2463
2464         r = -ENOMEM;
2465         size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
2466         entries = vmalloc(size);
2467         if (!entries)
2468                 goto out;
2469
2470         r = -EFAULT;
2471         if (copy_from_user(entries, user_msrs->entries, size))
2472                 goto out_free;
2473
2474         r = n = __msr_io(vcpu, &msrs, entries, do_msr);
2475         if (r < 0)
2476                 goto out_free;
2477
2478         r = -EFAULT;
2479         if (writeback && copy_to_user(user_msrs->entries, entries, size))
2480                 goto out_free;
2481
2482         r = n;
2483
2484 out_free:
2485         vfree(entries);
2486 out:
2487         return r;
2488 }
2489
2490 /*
2491  * Translate a guest virtual address to a guest physical address.
2492  */
2493 static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2494                                     struct kvm_translation *tr)
2495 {
2496         unsigned long vaddr = tr->linear_address;
2497         gpa_t gpa;
2498
2499         vcpu_load(vcpu);
2500         mutex_lock(&vcpu->kvm->lock);
2501         gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
2502         tr->physical_address = gpa;
2503         tr->valid = gpa != UNMAPPED_GVA;
2504         tr->writeable = 1;
2505         tr->usermode = 0;
2506         mutex_unlock(&vcpu->kvm->lock);
2507         vcpu_put(vcpu);
2508
2509         return 0;
2510 }
2511
2512 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2513                                     struct kvm_interrupt *irq)
2514 {
2515         if (irq->irq < 0 || irq->irq >= 256)
2516                 return -EINVAL;
2517         if (irqchip_in_kernel(vcpu->kvm))
2518                 return -ENXIO;
2519         vcpu_load(vcpu);
2520
2521         set_bit(irq->irq, vcpu->irq_pending);
2522         set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
2523
2524         vcpu_put(vcpu);
2525
2526         return 0;
2527 }
2528
2529 static int kvm_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
2530                                       struct kvm_debug_guest *dbg)
2531 {
2532         int r;
2533
2534         vcpu_load(vcpu);
2535
2536         r = kvm_x86_ops->set_guest_debug(vcpu, dbg);
2537
2538         vcpu_put(vcpu);
2539
2540         return r;
2541 }
2542
2543 static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
2544                                     unsigned long address,
2545                                     int *type)
2546 {
2547         struct kvm_vcpu *vcpu = vma->vm_file->private_data;
2548         unsigned long pgoff;
2549         struct page *page;
2550
2551         pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
2552         if (pgoff == 0)
2553                 page = virt_to_page(vcpu->run);
2554         else if (pgoff == KVM_PIO_PAGE_OFFSET)
2555                 page = virt_to_page(vcpu->pio_data);
2556         else
2557                 return NOPAGE_SIGBUS;
2558         get_page(page);
2559         if (type != NULL)
2560                 *type = VM_FAULT_MINOR;
2561
2562         return page;
2563 }
2564
2565 static struct vm_operations_struct kvm_vcpu_vm_ops = {
2566         .nopage = kvm_vcpu_nopage,
2567 };
2568
2569 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2570 {
2571         vma->vm_ops = &kvm_vcpu_vm_ops;
2572         return 0;
2573 }
2574
2575 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2576 {
2577         struct kvm_vcpu *vcpu = filp->private_data;
2578
2579         fput(vcpu->kvm->filp);
2580         return 0;
2581 }
2582
2583 static struct file_operations kvm_vcpu_fops = {
2584         .release        = kvm_vcpu_release,
2585         .unlocked_ioctl = kvm_vcpu_ioctl,
2586         .compat_ioctl   = kvm_vcpu_ioctl,
2587         .mmap           = kvm_vcpu_mmap,
2588 };
2589
2590 /*
2591  * Allocates an inode for the vcpu.
2592  */
2593 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2594 {
2595         int fd, r;
2596         struct inode *inode;
2597         struct file *file;
2598
2599         r = anon_inode_getfd(&fd, &inode, &file,
2600                              "kvm-vcpu", &kvm_vcpu_fops, vcpu);
2601         if (r)
2602                 return r;
2603         atomic_inc(&vcpu->kvm->filp->f_count);
2604         return fd;
2605 }
2606
2607 /*
2608  * Creates some virtual cpus.  Good luck creating more than one.
2609  */
2610 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
2611 {
2612         int r;
2613         struct kvm_vcpu *vcpu;
2614
2615         if (!valid_vcpu(n))
2616                 return -EINVAL;
2617
2618         vcpu = kvm_x86_ops->vcpu_create(kvm, n);
2619         if (IS_ERR(vcpu))
2620                 return PTR_ERR(vcpu);
2621
2622         preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
2623
2624         /* We do fxsave: this must be aligned. */
2625         BUG_ON((unsigned long)&vcpu->host_fx_image & 0xF);
2626
2627         vcpu_load(vcpu);
2628         r = kvm_mmu_setup(vcpu);
2629         vcpu_put(vcpu);
2630         if (r < 0)
2631                 goto free_vcpu;
2632
2633         mutex_lock(&kvm->lock);
2634         if (kvm->vcpus[n]) {
2635                 r = -EEXIST;
2636                 mutex_unlock(&kvm->lock);
2637                 goto mmu_unload;
2638         }
2639         kvm->vcpus[n] = vcpu;
2640         mutex_unlock(&kvm->lock);
2641
2642         /* Now it's all set up, let userspace reach it */
2643         r = create_vcpu_fd(vcpu);
2644         if (r < 0)
2645                 goto unlink;
2646         return r;
2647
2648 unlink:
2649         mutex_lock(&kvm->lock);
2650         kvm->vcpus[n] = NULL;
2651         mutex_unlock(&kvm->lock);
2652
2653 mmu_unload:
2654         vcpu_load(vcpu);
2655         kvm_mmu_unload(vcpu);
2656         vcpu_put(vcpu);
2657
2658 free_vcpu:
2659         kvm_x86_ops->vcpu_free(vcpu);
2660         return r;
2661 }
2662
2663 static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
2664 {
2665         u64 efer;
2666         int i;
2667         struct kvm_cpuid_entry *e, *entry;
2668
2669         rdmsrl(MSR_EFER, efer);
2670         entry = NULL;
2671         for (i = 0; i < vcpu->cpuid_nent; ++i) {
2672                 e = &vcpu->cpuid_entries[i];
2673                 if (e->function == 0x80000001) {
2674                         entry = e;
2675                         break;
2676                 }
2677         }
2678         if (entry && (entry->edx & (1 << 20)) && !(efer & EFER_NX)) {
2679                 entry->edx &= ~(1 << 20);
2680                 printk(KERN_INFO "kvm: guest NX capability removed\n");
2681         }
2682 }
2683
2684 static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
2685                                     struct kvm_cpuid *cpuid,
2686                                     struct kvm_cpuid_entry __user *entries)
2687 {
2688         int r;
2689
2690         r = -E2BIG;
2691         if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2692                 goto out;
2693         r = -EFAULT;
2694         if (copy_from_user(&vcpu->cpuid_entries, entries,
2695                            cpuid->nent * sizeof(struct kvm_cpuid_entry)))
2696                 goto out;
2697         vcpu->cpuid_nent = cpuid->nent;
2698         cpuid_fix_nx_cap(vcpu);
2699         return 0;
2700
2701 out:
2702         return r;
2703 }
2704
2705 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2706 {
2707         if (sigset) {
2708                 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2709                 vcpu->sigset_active = 1;
2710                 vcpu->sigset = *sigset;
2711         } else
2712                 vcpu->sigset_active = 0;
2713         return 0;
2714 }
2715
2716 /*
2717  * fxsave fpu state.  Taken from x86_64/processor.h.  To be killed when
2718  * we have asm/x86/processor.h
2719  */
2720 struct fxsave {
2721         u16     cwd;
2722         u16     swd;
2723         u16     twd;
2724         u16     fop;
2725         u64     rip;
2726         u64     rdp;
2727         u32     mxcsr;
2728         u32     mxcsr_mask;
2729         u32     st_space[32];   /* 8*16 bytes for each FP-reg = 128 bytes */
2730 #ifdef CONFIG_X86_64
2731         u32     xmm_space[64];  /* 16*16 bytes for each XMM-reg = 256 bytes */
2732 #else
2733         u32     xmm_space[32];  /* 8*16 bytes for each XMM-reg = 128 bytes */
2734 #endif
2735 };
2736
2737 static int kvm_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2738 {
2739         struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
2740
2741         vcpu_load(vcpu);
2742
2743         memcpy(fpu->fpr, fxsave->st_space, 128);
2744         fpu->fcw = fxsave->cwd;
2745         fpu->fsw = fxsave->swd;
2746         fpu->ftwx = fxsave->twd;
2747         fpu->last_opcode = fxsave->fop;
2748         fpu->last_ip = fxsave->rip;
2749         fpu->last_dp = fxsave->rdp;
2750         memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
2751
2752         vcpu_put(vcpu);
2753
2754         return 0;
2755 }
2756
2757 static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2758 {
2759         struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
2760
2761         vcpu_load(vcpu);
2762
2763         memcpy(fxsave->st_space, fpu->fpr, 128);
2764         fxsave->cwd = fpu->fcw;
2765         fxsave->swd = fpu->fsw;
2766         fxsave->twd = fpu->ftwx;
2767         fxsave->fop = fpu->last_opcode;
2768         fxsave->rip = fpu->last_ip;
2769         fxsave->rdp = fpu->last_dp;
2770         memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
2771
2772         vcpu_put(vcpu);
2773
2774         return 0;
2775 }
2776
2777 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
2778                                     struct kvm_lapic_state *s)
2779 {
2780         vcpu_load(vcpu);
2781         memcpy(s->regs, vcpu->apic->regs, sizeof *s);
2782         vcpu_put(vcpu);
2783
2784         return 0;
2785 }
2786
2787 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
2788                                     struct kvm_lapic_state *s)
2789 {
2790         vcpu_load(vcpu);
2791         memcpy(vcpu->apic->regs, s->regs, sizeof *s);
2792         kvm_apic_post_state_restore(vcpu);
2793         vcpu_put(vcpu);
2794
2795         return 0;
2796 }
2797
2798 static long kvm_vcpu_ioctl(struct file *filp,
2799                            unsigned int ioctl, unsigned long arg)
2800 {
2801         struct kvm_vcpu *vcpu = filp->private_data;
2802         void __user *argp = (void __user *)arg;
2803         int r = -EINVAL;
2804
2805         switch (ioctl) {
2806         case KVM_RUN:
2807                 r = -EINVAL;
2808                 if (arg)
2809                         goto out;
2810                 r = kvm_vcpu_ioctl_run(vcpu, vcpu->run);
2811                 break;
2812         case KVM_GET_REGS: {
2813                 struct kvm_regs kvm_regs;
2814
2815                 memset(&kvm_regs, 0, sizeof kvm_regs);
2816                 r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
2817                 if (r)
2818                         goto out;
2819                 r = -EFAULT;
2820                 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
2821                         goto out;
2822                 r = 0;
2823                 break;
2824         }
2825         case KVM_SET_REGS: {
2826                 struct kvm_regs kvm_regs;
2827
2828                 r = -EFAULT;
2829                 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
2830                         goto out;
2831                 r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
2832                 if (r)
2833                         goto out;
2834                 r = 0;
2835                 break;
2836         }
2837         case KVM_GET_SREGS: {
2838                 struct kvm_sregs kvm_sregs;
2839
2840                 memset(&kvm_sregs, 0, sizeof kvm_sregs);
2841                 r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
2842                 if (r)
2843                         goto out;
2844                 r = -EFAULT;
2845                 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
2846                         goto out;
2847                 r = 0;
2848                 break;
2849         }
2850         case KVM_SET_SREGS: {
2851                 struct kvm_sregs kvm_sregs;
2852
2853                 r = -EFAULT;
2854                 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
2855                         goto out;
2856                 r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
2857                 if (r)
2858                         goto out;
2859                 r = 0;
2860                 break;
2861         }
2862         case KVM_TRANSLATE: {
2863                 struct kvm_translation tr;
2864
2865                 r = -EFAULT;
2866                 if (copy_from_user(&tr, argp, sizeof tr))
2867                         goto out;
2868                 r = kvm_vcpu_ioctl_translate(vcpu, &tr);
2869                 if (r)
2870                         goto out;
2871                 r = -EFAULT;
2872                 if (copy_to_user(argp, &tr, sizeof tr))
2873                         goto out;
2874                 r = 0;
2875                 break;
2876         }
2877         case KVM_INTERRUPT: {
2878                 struct kvm_interrupt irq;
2879
2880                 r = -EFAULT;
2881                 if (copy_from_user(&irq, argp, sizeof irq))
2882                         goto out;
2883                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
2884                 if (r)
2885                         goto out;
2886                 r = 0;
2887                 break;
2888         }
2889         case KVM_DEBUG_GUEST: {
2890                 struct kvm_debug_guest dbg;
2891
2892                 r = -EFAULT;
2893                 if (copy_from_user(&dbg, argp, sizeof dbg))
2894                         goto out;
2895                 r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg);
2896                 if (r)
2897                         goto out;
2898                 r = 0;
2899                 break;
2900         }
2901         case KVM_GET_MSRS:
2902                 r = msr_io(vcpu, argp, kvm_get_msr, 1);
2903                 break;
2904         case KVM_SET_MSRS:
2905                 r = msr_io(vcpu, argp, do_set_msr, 0);
2906                 break;
2907         case KVM_SET_CPUID: {
2908                 struct kvm_cpuid __user *cpuid_arg = argp;
2909                 struct kvm_cpuid cpuid;
2910
2911                 r = -EFAULT;
2912                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2913                         goto out;
2914                 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
2915                 if (r)
2916                         goto out;
2917                 break;
2918         }
2919         case KVM_SET_SIGNAL_MASK: {
2920                 struct kvm_signal_mask __user *sigmask_arg = argp;
2921                 struct kvm_signal_mask kvm_sigmask;
2922                 sigset_t sigset, *p;
2923
2924                 p = NULL;
2925                 if (argp) {
2926                         r = -EFAULT;
2927                         if (copy_from_user(&kvm_sigmask, argp,
2928                                            sizeof kvm_sigmask))
2929                                 goto out;
2930                         r = -EINVAL;
2931                         if (kvm_sigmask.len != sizeof sigset)
2932                                 goto out;
2933                         r = -EFAULT;
2934                         if (copy_from_user(&sigset, sigmask_arg->sigset,
2935                                            sizeof sigset))
2936                                 goto out;
2937                         p = &sigset;
2938                 }
2939                 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2940                 break;
2941         }
2942         case KVM_GET_FPU: {
2943                 struct kvm_fpu fpu;
2944
2945                 memset(&fpu, 0, sizeof fpu);
2946                 r = kvm_vcpu_ioctl_get_fpu(vcpu, &fpu);
2947                 if (r)
2948                         goto out;
2949                 r = -EFAULT;
2950                 if (copy_to_user(argp, &fpu, sizeof fpu))
2951                         goto out;
2952                 r = 0;
2953                 break;
2954         }
2955         case KVM_SET_FPU: {
2956                 struct kvm_fpu fpu;
2957
2958                 r = -EFAULT;
2959                 if (copy_from_user(&fpu, argp, sizeof fpu))
2960                         goto out;
2961                 r = kvm_vcpu_ioctl_set_fpu(vcpu, &fpu);
2962                 if (r)
2963                         goto out;
2964                 r = 0;
2965                 break;
2966         }
2967         case KVM_GET_LAPIC: {
2968                 struct kvm_lapic_state lapic;
2969
2970                 memset(&lapic, 0, sizeof lapic);
2971                 r = kvm_vcpu_ioctl_get_lapic(vcpu, &lapic);
2972                 if (r)
2973                         goto out;
2974                 r = -EFAULT;
2975                 if (copy_to_user(argp, &lapic, sizeof lapic))
2976                         goto out;
2977                 r = 0;
2978                 break;
2979         }
2980         case KVM_SET_LAPIC: {
2981                 struct kvm_lapic_state lapic;
2982
2983                 r = -EFAULT;
2984                 if (copy_from_user(&lapic, argp, sizeof lapic))
2985                         goto out;
2986                 r = kvm_vcpu_ioctl_set_lapic(vcpu, &lapic);;
2987                 if (r)
2988                         goto out;
2989                 r = 0;
2990                 break;
2991         }
2992         default:
2993                 ;
2994         }
2995 out:
2996         return r;
2997 }
2998
2999 static long kvm_vm_ioctl(struct file *filp,
3000                            unsigned int ioctl, unsigned long arg)
3001 {
3002         struct kvm *kvm = filp->private_data;
3003         void __user *argp = (void __user *)arg;
3004         int r = -EINVAL;
3005
3006         switch (ioctl) {
3007         case KVM_CREATE_VCPU:
3008                 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
3009                 if (r < 0)
3010                         goto out;
3011                 break;
3012         case KVM_SET_MEMORY_REGION: {
3013                 struct kvm_memory_region kvm_mem;
3014
3015                 r = -EFAULT;
3016                 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
3017                         goto out;
3018                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_mem);
3019                 if (r)
3020                         goto out;
3021                 break;
3022         }
3023         case KVM_GET_DIRTY_LOG: {
3024                 struct kvm_dirty_log log;
3025
3026                 r = -EFAULT;
3027                 if (copy_from_user(&log, argp, sizeof log))
3028                         goto out;
3029                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
3030                 if (r)
3031                         goto out;
3032                 break;
3033         }
3034         case KVM_SET_MEMORY_ALIAS: {
3035                 struct kvm_memory_alias alias;
3036
3037                 r = -EFAULT;
3038                 if (copy_from_user(&alias, argp, sizeof alias))
3039                         goto out;
3040                 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
3041                 if (r)
3042                         goto out;
3043                 break;
3044         }
3045         case KVM_CREATE_IRQCHIP:
3046                 r = -ENOMEM;
3047                 kvm->vpic = kvm_create_pic(kvm);
3048                 if (kvm->vpic) {
3049                         r = kvm_ioapic_init(kvm);
3050                         if (r) {
3051                                 kfree(kvm->vpic);
3052                                 kvm->vpic = NULL;
3053                                 goto out;
3054                         }
3055                 }
3056                 else
3057                         goto out;
3058                 break;
3059         case KVM_IRQ_LINE: {
3060                 struct kvm_irq_level irq_event;
3061
3062                 r = -EFAULT;
3063                 if (copy_from_user(&irq_event, argp, sizeof irq_event))
3064                         goto out;
3065                 if (irqchip_in_kernel(kvm)) {
3066                         mutex_lock(&kvm->lock);
3067                         if (irq_event.irq < 16)
3068                                 kvm_pic_set_irq(pic_irqchip(kvm),
3069                                         irq_event.irq,
3070                                         irq_event.level);
3071                         kvm_ioapic_set_irq(kvm->vioapic,
3072                                         irq_event.irq,
3073                                         irq_event.level);
3074                         mutex_unlock(&kvm->lock);
3075                         r = 0;
3076                 }
3077                 break;
3078         }
3079         case KVM_GET_IRQCHIP: {
3080                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
3081                 struct kvm_irqchip chip;
3082
3083                 r = -EFAULT;
3084                 if (copy_from_user(&chip, argp, sizeof chip))
3085                         goto out;
3086                 r = -ENXIO;
3087                 if (!irqchip_in_kernel(kvm))
3088                         goto out;
3089                 r = kvm_vm_ioctl_get_irqchip(kvm, &chip);
3090                 if (r)
3091                         goto out;
3092                 r = -EFAULT;
3093                 if (copy_to_user(argp, &chip, sizeof chip))
3094                         goto out;
3095                 r = 0;
3096                 break;
3097         }
3098         case KVM_SET_IRQCHIP: {
3099                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
3100                 struct kvm_irqchip chip;
3101
3102                 r = -EFAULT;
3103                 if (copy_from_user(&chip, argp, sizeof chip))
3104                         goto out;
3105                 r = -ENXIO;
3106                 if (!irqchip_in_kernel(kvm))
3107                         goto out;
3108                 r = kvm_vm_ioctl_set_irqchip(kvm, &chip);
3109                 if (r)
3110                         goto out;
3111                 r = 0;
3112                 break;
3113         }
3114         default:
3115                 ;
3116         }
3117 out:
3118         return r;
3119 }
3120
3121 static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
3122                                   unsigned long address,
3123                                   int *type)
3124 {
3125         struct kvm *kvm = vma->vm_file->private_data;
3126         unsigned long pgoff;
3127         struct page *page;
3128
3129         pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
3130         page = gfn_to_page(kvm, pgoff);
3131         if (!page)
3132                 return NOPAGE_SIGBUS;
3133         get_page(page);
3134         if (type != NULL)
3135                 *type = VM_FAULT_MINOR;
3136
3137         return page;
3138 }
3139
3140 static struct vm_operations_struct kvm_vm_vm_ops = {
3141         .nopage = kvm_vm_nopage,
3142 };
3143
3144 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
3145 {
3146         vma->vm_ops = &kvm_vm_vm_ops;
3147         return 0;
3148 }
3149
3150 static struct file_operations kvm_vm_fops = {
3151         .release        = kvm_vm_release,
3152         .unlocked_ioctl = kvm_vm_ioctl,
3153         .compat_ioctl   = kvm_vm_ioctl,
3154         .mmap           = kvm_vm_mmap,
3155 };
3156
3157 static int kvm_dev_ioctl_create_vm(void)
3158 {
3159         int fd, r;
3160         struct inode *inode;
3161         struct file *file;
3162         struct kvm *kvm;
3163
3164         kvm = kvm_create_vm();
3165         if (IS_ERR(kvm))
3166                 return PTR_ERR(kvm);
3167         r = anon_inode_getfd(&fd, &inode, &file, "kvm-vm", &kvm_vm_fops, kvm);
3168         if (r) {
3169                 kvm_destroy_vm(kvm);
3170                 return r;
3171         }
3172
3173         kvm->filp = file;
3174
3175         return fd;
3176 }
3177
3178 static long kvm_dev_ioctl(struct file *filp,
3179                           unsigned int ioctl, unsigned long arg)
3180 {
3181         void __user *argp = (void __user *)arg;
3182         long r = -EINVAL;
3183
3184         switch (ioctl) {
3185         case KVM_GET_API_VERSION:
3186                 r = -EINVAL;
3187                 if (arg)
3188                         goto out;
3189                 r = KVM_API_VERSION;
3190                 break;
3191         case KVM_CREATE_VM:
3192                 r = -EINVAL;
3193                 if (arg)
3194                         goto out;
3195                 r = kvm_dev_ioctl_create_vm();
3196                 break;
3197         case KVM_GET_MSR_INDEX_LIST: {
3198                 struct kvm_msr_list __user *user_msr_list = argp;
3199                 struct kvm_msr_list msr_list;
3200                 unsigned n;
3201
3202                 r = -EFAULT;
3203                 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
3204                         goto out;
3205                 n = msr_list.nmsrs;
3206                 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
3207                 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
3208                         goto out;
3209                 r = -E2BIG;
3210                 if (n < num_msrs_to_save)
3211                         goto out;
3212                 r = -EFAULT;
3213                 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
3214                                  num_msrs_to_save * sizeof(u32)))
3215                         goto out;
3216                 if (copy_to_user(user_msr_list->indices
3217                                  + num_msrs_to_save * sizeof(u32),
3218                                  &emulated_msrs,
3219                                  ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
3220                         goto out;
3221                 r = 0;
3222                 break;
3223         }
3224         case KVM_CHECK_EXTENSION: {
3225                 int ext = (long)argp;
3226
3227                 switch (ext) {
3228                 case KVM_CAP_IRQCHIP:
3229                 case KVM_CAP_HLT:
3230                         r = 1;
3231                         break;
3232                 default:
3233                         r = 0;
3234                         break;
3235                 }
3236                 break;
3237         }
3238         case KVM_GET_VCPU_MMAP_SIZE:
3239                 r = -EINVAL;
3240                 if (arg)
3241                         goto out;
3242                 r = 2 * PAGE_SIZE;
3243                 break;
3244         default:
3245                 ;
3246         }
3247 out:
3248         return r;
3249 }
3250
3251 static struct file_operations kvm_chardev_ops = {
3252         .unlocked_ioctl = kvm_dev_ioctl,
3253         .compat_ioctl   = kvm_dev_ioctl,
3254 };
3255
3256 static struct miscdevice kvm_dev = {
3257         KVM_MINOR,
3258         "kvm",
3259         &kvm_chardev_ops,
3260 };
3261
3262 /*
3263  * Make sure that a cpu that is being hot-unplugged does not have any vcpus
3264  * cached on it.
3265  */
3266 static void decache_vcpus_on_cpu(int cpu)
3267 {
3268         struct kvm *vm;
3269         struct kvm_vcpu *vcpu;
3270         int i;
3271
3272         spin_lock(&kvm_lock);
3273         list_for_each_entry(vm, &vm_list, vm_list)
3274                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
3275                         vcpu = vm->vcpus[i];
3276                         if (!vcpu)
3277                                 continue;
3278                         /*
3279                          * If the vcpu is locked, then it is running on some
3280                          * other cpu and therefore it is not cached on the
3281                          * cpu in question.
3282                          *
3283                          * If it's not locked, check the last cpu it executed
3284                          * on.
3285                          */
3286                         if (mutex_trylock(&vcpu->mutex)) {
3287                                 if (vcpu->cpu == cpu) {
3288                                         kvm_x86_ops->vcpu_decache(vcpu);
3289                                         vcpu->cpu = -1;
3290                                 }
3291                                 mutex_unlock(&vcpu->mutex);
3292                         }
3293                 }
3294         spin_unlock(&kvm_lock);
3295 }
3296
3297 static void hardware_enable(void *junk)
3298 {
3299         int cpu = raw_smp_processor_id();
3300
3301         if (cpu_isset(cpu, cpus_hardware_enabled))
3302                 return;
3303         cpu_set(cpu, cpus_hardware_enabled);
3304         kvm_x86_ops->hardware_enable(NULL);
3305 }
3306
3307 static void hardware_disable(void *junk)
3308 {
3309         int cpu = raw_smp_processor_id();
3310
3311         if (!cpu_isset(cpu, cpus_hardware_enabled))
3312                 return;
3313         cpu_clear(cpu, cpus_hardware_enabled);
3314         decache_vcpus_on_cpu(cpu);
3315         kvm_x86_ops->hardware_disable(NULL);
3316 }
3317
3318 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
3319                            void *v)
3320 {
3321         int cpu = (long)v;
3322
3323         switch (val) {
3324         case CPU_DYING:
3325         case CPU_DYING_FROZEN:
3326                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
3327                        cpu);
3328                 hardware_disable(NULL);
3329                 break;
3330         case CPU_UP_CANCELED:
3331         case CPU_UP_CANCELED_FROZEN:
3332                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
3333                        cpu);
3334                 smp_call_function_single(cpu, hardware_disable, NULL, 0, 1);
3335                 break;
3336         case CPU_ONLINE:
3337         case CPU_ONLINE_FROZEN:
3338                 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
3339                        cpu);
3340                 smp_call_function_single(cpu, hardware_enable, NULL, 0, 1);
3341                 break;
3342         }
3343         return NOTIFY_OK;
3344 }
3345
3346 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
3347                        void *v)
3348 {
3349         if (val == SYS_RESTART) {
3350                 /*
3351                  * Some (well, at least mine) BIOSes hang on reboot if
3352                  * in vmx root mode.
3353                  */
3354                 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
3355                 on_each_cpu(hardware_disable, NULL, 0, 1);
3356         }
3357         return NOTIFY_OK;
3358 }
3359
3360 static struct notifier_block kvm_reboot_notifier = {
3361         .notifier_call = kvm_reboot,
3362         .priority = 0,
3363 };
3364
3365 void kvm_io_bus_init(struct kvm_io_bus *bus)
3366 {
3367         memset(bus, 0, sizeof(*bus));
3368 }
3369
3370 void kvm_io_bus_destroy(struct kvm_io_bus *bus)
3371 {
3372         int i;
3373
3374         for (i = 0; i < bus->dev_count; i++) {
3375                 struct kvm_io_device *pos = bus->devs[i];
3376
3377                 kvm_iodevice_destructor(pos);
3378         }
3379 }
3380
3381 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr)
3382 {
3383         int i;
3384
3385         for (i = 0; i < bus->dev_count; i++) {
3386                 struct kvm_io_device *pos = bus->devs[i];
3387
3388                 if (pos->in_range(pos, addr))
3389                         return pos;
3390         }
3391
3392         return NULL;
3393 }
3394
3395 void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
3396 {
3397         BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
3398
3399         bus->devs[bus->dev_count++] = dev;
3400 }
3401
3402 static struct notifier_block kvm_cpu_notifier = {
3403         .notifier_call = kvm_cpu_hotplug,
3404         .priority = 20, /* must be > scheduler priority */
3405 };
3406
3407 static u64 stat_get(void *_offset)
3408 {
3409         unsigned offset = (long)_offset;
3410         u64 total = 0;
3411         struct kvm *kvm;
3412         struct kvm_vcpu *vcpu;
3413         int i;
3414
3415         spin_lock(&kvm_lock);
3416         list_for_each_entry(kvm, &vm_list, vm_list)
3417                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
3418                         vcpu = kvm->vcpus[i];
3419                         if (vcpu)
3420                                 total += *(u32 *)((void *)vcpu + offset);
3421                 }
3422         spin_unlock(&kvm_lock);
3423         return total;
3424 }
3425
3426 DEFINE_SIMPLE_ATTRIBUTE(stat_fops, stat_get, NULL, "%llu\n");
3427
3428 static __init void kvm_init_debug(void)
3429 {
3430         struct kvm_stats_debugfs_item *p;
3431
3432         debugfs_dir = debugfs_create_dir("kvm", NULL);
3433         for (p = debugfs_entries; p->name; ++p)
3434                 p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir,
3435                                                 (void *)(long)p->offset,
3436                                                 &stat_fops);
3437 }
3438
3439 static void kvm_exit_debug(void)
3440 {
3441         struct kvm_stats_debugfs_item *p;
3442
3443         for (p = debugfs_entries; p->name; ++p)
3444                 debugfs_remove(p->dentry);
3445         debugfs_remove(debugfs_dir);
3446 }
3447
3448 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
3449 {
3450         hardware_disable(NULL);
3451         return 0;
3452 }
3453
3454 static int kvm_resume(struct sys_device *dev)
3455 {
3456         hardware_enable(NULL);
3457         return 0;
3458 }
3459
3460 static struct sysdev_class kvm_sysdev_class = {
3461         set_kset_name("kvm"),
3462         .suspend = kvm_suspend,
3463         .resume = kvm_resume,
3464 };
3465
3466 static struct sys_device kvm_sysdev = {
3467         .id = 0,
3468         .cls = &kvm_sysdev_class,
3469 };
3470
3471 hpa_t bad_page_address;
3472
3473 static inline
3474 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
3475 {
3476         return container_of(pn, struct kvm_vcpu, preempt_notifier);
3477 }
3478
3479 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
3480 {
3481         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3482
3483         kvm_x86_ops->vcpu_load(vcpu, cpu);
3484 }
3485
3486 static void kvm_sched_out(struct preempt_notifier *pn,
3487                           struct task_struct *next)
3488 {
3489         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3490
3491         kvm_x86_ops->vcpu_put(vcpu);
3492 }
3493
3494 int kvm_init_x86(struct kvm_x86_ops *ops, unsigned int vcpu_size,
3495                   struct module *module)
3496 {
3497         int r;
3498         int cpu;
3499
3500         if (kvm_x86_ops) {
3501                 printk(KERN_ERR "kvm: already loaded the other module\n");
3502                 return -EEXIST;
3503         }
3504
3505         if (!ops->cpu_has_kvm_support()) {
3506                 printk(KERN_ERR "kvm: no hardware support\n");
3507                 return -EOPNOTSUPP;
3508         }
3509         if (ops->disabled_by_bios()) {
3510                 printk(KERN_ERR "kvm: disabled by bios\n");
3511                 return -EOPNOTSUPP;
3512         }
3513
3514         kvm_x86_ops = ops;
3515
3516         r = kvm_x86_ops->hardware_setup();
3517         if (r < 0)
3518                 goto out;
3519
3520         for_each_online_cpu(cpu) {
3521                 smp_call_function_single(cpu,
3522                                 kvm_x86_ops->check_processor_compatibility,
3523                                 &r, 0, 1);
3524                 if (r < 0)
3525                         goto out_free_0;
3526         }
3527
3528         on_each_cpu(hardware_enable, NULL, 0, 1);
3529         r = register_cpu_notifier(&kvm_cpu_notifier);
3530         if (r)
3531                 goto out_free_1;
3532         register_reboot_notifier(&kvm_reboot_notifier);
3533
3534         r = sysdev_class_register(&kvm_sysdev_class);
3535         if (r)
3536                 goto out_free_2;
3537
3538         r = sysdev_register(&kvm_sysdev);
3539         if (r)
3540                 goto out_free_3;
3541
3542         /* A kmem cache lets us meet the alignment requirements of fx_save. */
3543         kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
3544                                            __alignof__(struct kvm_vcpu), 0, 0);
3545         if (!kvm_vcpu_cache) {
3546                 r = -ENOMEM;
3547                 goto out_free_4;
3548         }
3549
3550         kvm_chardev_ops.owner = module;
3551
3552         r = misc_register(&kvm_dev);
3553         if (r) {
3554                 printk (KERN_ERR "kvm: misc device register failed\n");
3555                 goto out_free;
3556         }
3557
3558         kvm_preempt_ops.sched_in = kvm_sched_in;
3559         kvm_preempt_ops.sched_out = kvm_sched_out;
3560
3561         return r;
3562
3563 out_free:
3564         kmem_cache_destroy(kvm_vcpu_cache);
3565 out_free_4:
3566         sysdev_unregister(&kvm_sysdev);
3567 out_free_3:
3568         sysdev_class_unregister(&kvm_sysdev_class);
3569 out_free_2:
3570         unregister_reboot_notifier(&kvm_reboot_notifier);
3571         unregister_cpu_notifier(&kvm_cpu_notifier);
3572 out_free_1:
3573         on_each_cpu(hardware_disable, NULL, 0, 1);
3574 out_free_0:
3575         kvm_x86_ops->hardware_unsetup();
3576 out:
3577         kvm_x86_ops = NULL;
3578         return r;
3579 }
3580
3581 void kvm_exit_x86(void)
3582 {
3583         misc_deregister(&kvm_dev);
3584         kmem_cache_destroy(kvm_vcpu_cache);
3585         sysdev_unregister(&kvm_sysdev);
3586         sysdev_class_unregister(&kvm_sysdev_class);
3587         unregister_reboot_notifier(&kvm_reboot_notifier);
3588         unregister_cpu_notifier(&kvm_cpu_notifier);
3589         on_each_cpu(hardware_disable, NULL, 0, 1);
3590         kvm_x86_ops->hardware_unsetup();
3591         kvm_x86_ops = NULL;
3592 }
3593
3594 static __init int kvm_init(void)
3595 {
3596         static struct page *bad_page;
3597         int r;
3598
3599         r = kvm_mmu_module_init();
3600         if (r)
3601                 goto out4;
3602
3603         kvm_init_debug();
3604
3605         kvm_init_msr_list();
3606
3607         if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
3608                 r = -ENOMEM;
3609                 goto out;
3610         }
3611
3612         bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
3613         memset(__va(bad_page_address), 0, PAGE_SIZE);
3614
3615         return 0;
3616
3617 out:
3618         kvm_exit_debug();
3619         kvm_mmu_module_exit();
3620 out4:
3621         return r;
3622 }
3623
3624 static __exit void kvm_exit(void)
3625 {
3626         kvm_exit_debug();
3627         __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
3628         kvm_mmu_module_exit();
3629 }
3630
3631 module_init(kvm_init)
3632 module_exit(kvm_exit)
3633
3634 EXPORT_SYMBOL_GPL(kvm_init_x86);
3635 EXPORT_SYMBOL_GPL(kvm_exit_x86);