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   1 /*
   2  * Kernel-based Virtual Machine driver for Linux
   3  *
   4  * derived from drivers/kvm/kvm_main.c
   5  *
   6  * Copyright (C) 2006 Qumranet, Inc.
   7  *
   8  * Authors:
   9  *   Avi Kivity   <avi@qumranet.com>
  10  *   Yaniv Kamay  <yaniv@qumranet.com>
  11  *
  12  * This work is licensed under the terms of the GNU GPL, version 2.  See
  13  * the COPYING file in the top-level directory.
  14  *
  15  */
  16
  17 #include <linux/kvm_host.h>
  18 #include "segment_descriptor.h"
  19 #include "irq.h"
  20 #include "mmu.h"
  21
  22 #include <linux/kvm.h>
  23 #include <linux/fs.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/module.h>
  26 #include <linux/mman.h>
  27 #include <linux/highmem.h>
  28
  29 #include <asm/uaccess.h>
  30 #include <asm/msr.h>
  31
  32 #define MAX_IO_MSRS 256
  33 #define CR0_RESERVED_BITS                                               \
  34         (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
  35                           | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
  36                           | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))
  37 #define CR4_RESERVED_BITS                                               \
  38         (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
  39                           | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE     \
  40                           | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR  \
  41                           | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
  42
  43 #define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
  44 #define EFER_RESERVED_BITS 0xfffffffffffff2fe
  45
  46 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
  47 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
  48
  49 static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
  50                                     struct kvm_cpuid_entry2 __user *entries);
  51
  52 struct kvm_x86_ops *kvm_x86_ops;
  53
  54 struct kvm_stats_debugfs_item debugfs_entries[] = {
  55         { "pf_fixed", VCPU_STAT(pf_fixed) },
  56         { "pf_guest", VCPU_STAT(pf_guest) },
  57         { "tlb_flush", VCPU_STAT(tlb_flush) },
  58         { "invlpg", VCPU_STAT(invlpg) },
  59         { "exits", VCPU_STAT(exits) },
  60         { "io_exits", VCPU_STAT(io_exits) },
  61         { "mmio_exits", VCPU_STAT(mmio_exits) },
  62         { "signal_exits", VCPU_STAT(signal_exits) },
  63         { "irq_window", VCPU_STAT(irq_window_exits) },
  64         { "halt_exits", VCPU_STAT(halt_exits) },
  65         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
  66         { "request_irq", VCPU_STAT(request_irq_exits) },
  67         { "irq_exits", VCPU_STAT(irq_exits) },
  68         { "host_state_reload", VCPU_STAT(host_state_reload) },
  69         { "efer_reload", VCPU_STAT(efer_reload) },
  70         { "fpu_reload", VCPU_STAT(fpu_reload) },
  71         { "insn_emulation", VCPU_STAT(insn_emulation) },
  72         { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
  73         { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
  74         { "mmu_pte_write", VM_STAT(mmu_pte_write) },
  75         { "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
  76         { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
  77         { "mmu_flooded", VM_STAT(mmu_flooded) },
  78         { "mmu_recycled", VM_STAT(mmu_recycled) },
  79         { "mmu_cache_miss", VM_STAT(mmu_cache_miss) },
  80         { "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
  81         { NULL }
  82 };
  83
  84
  85 unsigned long segment_base(u16 selector)
  86 {
  87         struct descriptor_table gdt;
  88         struct segment_descriptor *d;
  89         unsigned long table_base;
  90         unsigned long v;
  91
  92         if (selector == 0)
  93                 return 0;
  94
  95         asm("sgdt %0" : "=m"(gdt));
  96         table_base = gdt.base;
  97
  98         if (selector & 4) {           /* from ldt */
  99                 u16 ldt_selector;
 100
 101                 asm("sldt %0" : "=g"(ldt_selector));
 102                 table_base = segment_base(ldt_selector);
 103         }
 104         d = (struct segment_descriptor *)(table_base + (selector & ~7));
 105         v = d->base_low | ((unsigned long)d->base_mid << 16) |
 106                 ((unsigned long)d->base_high << 24);
 107 #ifdef CONFIG_X86_64
 108         if (d->system == 0 && (d->type == 2 || d->type == 9 || d->type == 11))
 109                 v |= ((unsigned long) \
 110                       ((struct segment_descriptor_64 *)d)->base_higher) << 32;
 111 #endif
 112         return v;
 113 }
 114 EXPORT_SYMBOL_GPL(segment_base);
 115
 116 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
 117 {
 118         if (irqchip_in_kernel(vcpu->kvm))
 119                 return vcpu->arch.apic_base;
 120         else
 121                 return vcpu->arch.apic_base;
 122 }
 123 EXPORT_SYMBOL_GPL(kvm_get_apic_base);
 124
 125 void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
 126 {
 127         /* TODO: reserve bits check */
 128         if (irqchip_in_kernel(vcpu->kvm))
 129                 kvm_lapic_set_base(vcpu, data);
 130         else
 131                 vcpu->arch.apic_base = data;
 132 }
 133 EXPORT_SYMBOL_GPL(kvm_set_apic_base);
 134
 135 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
 136 {
 137         WARN_ON(vcpu->arch.exception.pending);
 138         vcpu->arch.exception.pending = true;
 139         vcpu->arch.exception.has_error_code = false;
 140         vcpu->arch.exception.nr = nr;
 141 }
 142 EXPORT_SYMBOL_GPL(kvm_queue_exception);
 143
 144 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long addr,
 145                            u32 error_code)
 146 {
 147         ++vcpu->stat.pf_guest;
 148         if (vcpu->arch.exception.pending && vcpu->arch.exception.nr == PF_VECTOR) {
 149                 printk(KERN_DEBUG "kvm: inject_page_fault:"
 150                        " double fault 0x%lx\n", addr);
 151                 vcpu->arch.exception.nr = DF_VECTOR;
 152                 vcpu->arch.exception.error_code = 0;
 153                 return;
 154         }
 155         vcpu->arch.cr2 = addr;
 156         kvm_queue_exception_e(vcpu, PF_VECTOR, error_code);
 157 }
 158
 159 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
 160 {
 161         WARN_ON(vcpu->arch.exception.pending);
 162         vcpu->arch.exception.pending = true;
 163         vcpu->arch.exception.has_error_code = true;
 164         vcpu->arch.exception.nr = nr;
 165         vcpu->arch.exception.error_code = error_code;
 166 }
 167 EXPORT_SYMBOL_GPL(kvm_queue_exception_e);
 168
 169 static void __queue_exception(struct kvm_vcpu *vcpu)
 170 {
 171         kvm_x86_ops->queue_exception(vcpu, vcpu->arch.exception.nr,
 172                                      vcpu->arch.exception.has_error_code,
 173                                      vcpu->arch.exception.error_code);
 174 }
 175
 176 /*
 177  * Load the pae pdptrs.  Return true is they are all valid.
 178  */
 179 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
 180 {
 181         gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
 182         unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
 183         int i;
 184         int ret;
 185         u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
 186
 187         down_read(&current->mm->mmap_sem);
 188         ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte,
 189                                   offset * sizeof(u64), sizeof(pdpte));
 190         if (ret < 0) {
 191                 ret = 0;
 192                 goto out;
 193         }
 194         for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
 195                 if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) {
 196                         ret = 0;
 197                         goto out;
 198                 }
 199         }
 200         ret = 1;
 201
 202         memcpy(vcpu->arch.pdptrs, pdpte, sizeof(vcpu->arch.pdptrs));
 203 out:
 204         up_read(&current->mm->mmap_sem);
 205
 206         return ret;
 207 }
 208
 209 static bool pdptrs_changed(struct kvm_vcpu *vcpu)
 210 {
 211         u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
 212         bool changed = true;
 213         int r;
 214
 215         if (is_long_mode(vcpu) || !is_pae(vcpu))
 216                 return false;
 217
 218         down_read(&current->mm->mmap_sem);
 219         r = kvm_read_guest(vcpu->kvm, vcpu->arch.cr3 & ~31u, pdpte, sizeof(pdpte));
 220         if (r < 0)
 221                 goto out;
 222         changed = memcmp(pdpte, vcpu->arch.pdptrs, sizeof(pdpte)) != 0;
 223 out:
 224         up_read(&current->mm->mmap_sem);
 225
 226         return changed;
 227 }
 228
 229 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 230 {
 231         if (cr0 & CR0_RESERVED_BITS) {
 232                 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
 233                        cr0, vcpu->arch.cr0);
 234                 kvm_inject_gp(vcpu, 0);
 235                 return;
 236         }
 237
 238         if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) {
 239                 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
 240                 kvm_inject_gp(vcpu, 0);
 241                 return;
 242         }
 243
 244         if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) {
 245                 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
 246                        "and a clear PE flag\n");
 247                 kvm_inject_gp(vcpu, 0);
 248                 return;
 249         }
 250
 251         if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
 252 #ifdef CONFIG_X86_64
 253                 if ((vcpu->arch.shadow_efer & EFER_LME)) {
 254                         int cs_db, cs_l;
 255
 256                         if (!is_pae(vcpu)) {
 257                                 printk(KERN_DEBUG "set_cr0: #GP, start paging "
 258                                        "in long mode while PAE is disabled\n");
 259                                 kvm_inject_gp(vcpu, 0);
 260                                 return;
 261                         }
 262                         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
 263                         if (cs_l) {
 264                                 printk(KERN_DEBUG "set_cr0: #GP, start paging "
 265                                        "in long mode while CS.L == 1\n");
 266                                 kvm_inject_gp(vcpu, 0);
 267                                 return;
 268
 269                         }
 270                 } else
 271 #endif
 272                 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.cr3)) {
 273                         printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
 274                                "reserved bits\n");
 275                         kvm_inject_gp(vcpu, 0);
 276                         return;
 277                 }
 278
 279         }
 280
 281         kvm_x86_ops->set_cr0(vcpu, cr0);
 282         vcpu->arch.cr0 = cr0;
 283
 284         kvm_mmu_reset_context(vcpu);
 285         return;
 286 }
 287 EXPORT_SYMBOL_GPL(set_cr0);
 288
 289 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
 290 {
 291         set_cr0(vcpu, (vcpu->arch.cr0 & ~0x0ful) | (msw & 0x0f));
 292 }
 293 EXPORT_SYMBOL_GPL(lmsw);
 294
 295 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
 296 {
 297         if (cr4 & CR4_RESERVED_BITS) {
 298                 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
 299                 kvm_inject_gp(vcpu, 0);
 300                 return;
 301         }
 302
 303         if (is_long_mode(vcpu)) {
 304                 if (!(cr4 & X86_CR4_PAE)) {
 305                         printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
 306                                "in long mode\n");
 307                         kvm_inject_gp(vcpu, 0);
 308                         return;
 309                 }
 310         } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & X86_CR4_PAE)
 311                    && !load_pdptrs(vcpu, vcpu->arch.cr3)) {
 312                 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
 313                 kvm_inject_gp(vcpu, 0);
 314                 return;
 315         }
 316
 317         if (cr4 & X86_CR4_VMXE) {
 318                 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
 319                 kvm_inject_gp(vcpu, 0);
 320                 return;
 321         }
 322         kvm_x86_ops->set_cr4(vcpu, cr4);
 323         vcpu->arch.cr4 = cr4;
 324         kvm_mmu_reset_context(vcpu);
 325 }
 326 EXPORT_SYMBOL_GPL(set_cr4);
 327
 328 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
 329 {
 330         if (cr3 == vcpu->arch.cr3 && !pdptrs_changed(vcpu)) {
 331                 kvm_mmu_flush_tlb(vcpu);
 332                 return;
 333         }
 334
 335         if (is_long_mode(vcpu)) {
 336                 if (cr3 & CR3_L_MODE_RESERVED_BITS) {
 337                         printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
 338                         kvm_inject_gp(vcpu, 0);
 339                         return;
 340                 }
 341         } else {
 342                 if (is_pae(vcpu)) {
 343                         if (cr3 & CR3_PAE_RESERVED_BITS) {
 344                                 printk(KERN_DEBUG
 345                                        "set_cr3: #GP, reserved bits\n");
 346                                 kvm_inject_gp(vcpu, 0);
 347                                 return;
 348                         }
 349                         if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) {
 350                                 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
 351                                        "reserved bits\n");
 352                                 kvm_inject_gp(vcpu, 0);
 353                                 return;
 354                         }
 355                 }
 356                 /*
 357                  * We don't check reserved bits in nonpae mode, because
 358                  * this isn't enforced, and VMware depends on this.
 359                  */
 360         }
 361
 362         down_read(&current->mm->mmap_sem);
 363         /*
 364          * Does the new cr3 value map to physical memory? (Note, we
 365          * catch an invalid cr3 even in real-mode, because it would
 366          * cause trouble later on when we turn on paging anyway.)
 367          *
 368          * A real CPU would silently accept an invalid cr3 and would
 369          * attempt to use it - with largely undefined (and often hard
 370          * to debug) behavior on the guest side.
 371          */
 372         if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
 373                 kvm_inject_gp(vcpu, 0);
 374         else {
 375                 vcpu->arch.cr3 = cr3;
 376                 vcpu->arch.mmu.new_cr3(vcpu);
 377         }
 378         up_read(&current->mm->mmap_sem);
 379 }
 380 EXPORT_SYMBOL_GPL(set_cr3);
 381
 382 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
 383 {
 384         if (cr8 & CR8_RESERVED_BITS) {
 385                 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
 386                 kvm_inject_gp(vcpu, 0);
 387                 return;
 388         }
 389         if (irqchip_in_kernel(vcpu->kvm))
 390                 kvm_lapic_set_tpr(vcpu, cr8);
 391         else
 392                 vcpu->arch.cr8 = cr8;
 393 }
 394 EXPORT_SYMBOL_GPL(set_cr8);
 395
 396 unsigned long get_cr8(struct kvm_vcpu *vcpu)
 397 {
 398         if (irqchip_in_kernel(vcpu->kvm))
 399                 return kvm_lapic_get_cr8(vcpu);
 400         else
 401                 return vcpu->arch.cr8;
 402 }
 403 EXPORT_SYMBOL_GPL(get_cr8);
 404
 405 /*
 406  * List of msr numbers which we expose to userspace through KVM_GET_MSRS
 407  * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
 408  *
 409  * This list is modified at module load time to reflect the
 410  * capabilities of the host cpu.
 411  */
 412 static u32 msrs_to_save[] = {
 413         MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
 414         MSR_K6_STAR,
 415 #ifdef CONFIG_X86_64
 416         MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
 417 #endif
 418         MSR_IA32_TIME_STAMP_COUNTER,
 419 };
 420
 421 static unsigned num_msrs_to_save;
 422
 423 static u32 emulated_msrs[] = {
 424         MSR_IA32_MISC_ENABLE,
 425 };
 426
 427 #ifdef CONFIG_X86_64
 428
 429 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
 430 {
 431         if (efer & EFER_RESERVED_BITS) {
 432                 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
 433                        efer);
 434                 kvm_inject_gp(vcpu, 0);
 435                 return;
 436         }
 437
 438         if (is_paging(vcpu)
 439             && (vcpu->arch.shadow_efer & EFER_LME) != (efer & EFER_LME)) {
 440                 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
 441                 kvm_inject_gp(vcpu, 0);
 442                 return;
 443         }
 444
 445         kvm_x86_ops->set_efer(vcpu, efer);
 446
 447         efer &= ~EFER_LMA;
 448         efer |= vcpu->arch.shadow_efer & EFER_LMA;
 449
 450         vcpu->arch.shadow_efer = efer;
 451 }
 452
 453 #endif
 454
 455 /*
 456  * Writes msr value into into the appropriate "register".
 457  * Returns 0 on success, non-0 otherwise.
 458  * Assumes vcpu_load() was already called.
 459  */
 460 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
 461 {
 462         return kvm_x86_ops->set_msr(vcpu, msr_index, data);
 463 }
 464
 465 /*
 466  * Adapt set_msr() to msr_io()'s calling convention
 467  */
 468 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
 469 {
 470         return kvm_set_msr(vcpu, index, *data);
 471 }
 472
 473
 474 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
 475 {
 476         switch (msr) {
 477 #ifdef CONFIG_X86_64
 478         case MSR_EFER:
 479                 set_efer(vcpu, data);
 480                 break;
 481 #endif
 482         case MSR_IA32_MC0_STATUS:
 483                 pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
 484                        __FUNCTION__, data);
 485                 break;
 486         case MSR_IA32_MCG_STATUS:
 487                 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
 488                         __FUNCTION__, data);
 489                 break;
 490         case MSR_IA32_MCG_CTL:
 491                 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_CTL 0x%llx, nop\n",
 492                         __FUNCTION__, data);
 493                 break;
 494         case MSR_IA32_UCODE_REV:
 495         case MSR_IA32_UCODE_WRITE:
 496         case 0x200 ... 0x2ff: /* MTRRs */
 497                 break;
 498         case MSR_IA32_APICBASE:
 499                 kvm_set_apic_base(vcpu, data);
 500                 break;
 501         case MSR_IA32_MISC_ENABLE:
 502                 vcpu->arch.ia32_misc_enable_msr = data;
 503                 break;
 504         default:
 505                 pr_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n", msr, data);
 506                 return 1;
 507         }
 508         return 0;
 509 }
 510 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
 511
 512
 513 /*
 514  * Reads an msr value (of 'msr_index') into 'pdata'.
 515  * Returns 0 on success, non-0 otherwise.
 516  * Assumes vcpu_load() was already called.
 517  */
 518 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
 519 {
 520         return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
 521 }
 522
 523 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
 524 {
 525         u64 data;
 526
 527         switch (msr) {
 528         case 0xc0010010: /* SYSCFG */
 529         case 0xc0010015: /* HWCR */
 530         case MSR_IA32_PLATFORM_ID:
 531         case MSR_IA32_P5_MC_ADDR:
 532         case MSR_IA32_P5_MC_TYPE:
 533         case MSR_IA32_MC0_CTL:
 534         case MSR_IA32_MCG_STATUS:
 535         case MSR_IA32_MCG_CAP:
 536         case MSR_IA32_MCG_CTL:
 537         case MSR_IA32_MC0_MISC:
 538         case MSR_IA32_MC0_MISC+4:
 539         case MSR_IA32_MC0_MISC+8:
 540         case MSR_IA32_MC0_MISC+12:
 541         case MSR_IA32_MC0_MISC+16:
 542         case MSR_IA32_UCODE_REV:
 543         case MSR_IA32_PERF_STATUS:
 544         case MSR_IA32_EBL_CR_POWERON:
 545                 /* MTRR registers */
 546         case 0xfe:
 547         case 0x200 ... 0x2ff:
 548                 data = 0;
 549                 break;
 550         case 0xcd: /* fsb frequency */
 551                 data = 3;
 552                 break;
 553         case MSR_IA32_APICBASE:
 554                 data = kvm_get_apic_base(vcpu);
 555                 break;
 556         case MSR_IA32_MISC_ENABLE:
 557                 data = vcpu->arch.ia32_misc_enable_msr;
 558                 break;
 559 #ifdef CONFIG_X86_64
 560         case MSR_EFER:
 561                 data = vcpu->arch.shadow_efer;
 562                 break;
 563 #endif
 564         default:
 565                 pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
 566                 return 1;
 567         }
 568         *pdata = data;
 569         return 0;
 570 }
 571 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
 572
 573 /*
 574  * Read or write a bunch of msrs. All parameters are kernel addresses.
 575  *
 576  * @return number of msrs set successfully.
 577  */
 578 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
 579                     struct kvm_msr_entry *entries,
 580                     int (*do_msr)(struct kvm_vcpu *vcpu,
 581                                   unsigned index, u64 *data))
 582 {
 583         int i;
 584
 585         vcpu_load(vcpu);
 586
 587         for (i = 0; i < msrs->nmsrs; ++i)
 588                 if (do_msr(vcpu, entries[i].index, &entries[i].data))
 589                         break;
 590
 591         vcpu_put(vcpu);
 592
 593         return i;
 594 }
 595
 596 /*
 597  * Read or write a bunch of msrs. Parameters are user addresses.
 598  *
 599  * @return number of msrs set successfully.
 600  */
 601 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
 602                   int (*do_msr)(struct kvm_vcpu *vcpu,
 603                                 unsigned index, u64 *data),
 604                   int writeback)
 605 {
 606         struct kvm_msrs msrs;
 607         struct kvm_msr_entry *entries;
 608         int r, n;
 609         unsigned size;
 610
 611         r = -EFAULT;
 612         if (copy_from_user(&msrs, user_msrs, sizeof msrs))
 613                 goto out;
 614
 615         r = -E2BIG;
 616         if (msrs.nmsrs >= MAX_IO_MSRS)
 617                 goto out;
 618
 619         r = -ENOMEM;
 620         size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
 621         entries = vmalloc(size);
 622         if (!entries)
 623                 goto out;
 624
 625         r = -EFAULT;
 626         if (copy_from_user(entries, user_msrs->entries, size))
 627                 goto out_free;
 628
 629         r = n = __msr_io(vcpu, &msrs, entries, do_msr);
 630         if (r < 0)
 631                 goto out_free;
 632
 633         r = -EFAULT;
 634         if (writeback && copy_to_user(user_msrs->entries, entries, size))
 635                 goto out_free;
 636
 637         r = n;
 638
 639 out_free:
 640         vfree(entries);
 641 out:
 642         return r;
 643 }
 644
 645 /*
 646  * Make sure that a cpu that is being hot-unplugged does not have any vcpus
 647  * cached on it.
 648  */
 649 void decache_vcpus_on_cpu(int cpu)
 650 {
 651         struct kvm *vm;
 652         struct kvm_vcpu *vcpu;
 653         int i;
 654
 655         spin_lock(&kvm_lock);
 656         list_for_each_entry(vm, &vm_list, vm_list)
 657                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 658                         vcpu = vm->vcpus[i];
 659                         if (!vcpu)
 660                                 continue;
 661                         /*
 662                          * If the vcpu is locked, then it is running on some
 663                          * other cpu and therefore it is not cached on the
 664                          * cpu in question.
 665                          *
 666                          * If it's not locked, check the last cpu it executed
 667                          * on.
 668                          */
 669                         if (mutex_trylock(&vcpu->mutex)) {
 670                                 if (vcpu->cpu == cpu) {
 671                                         kvm_x86_ops->vcpu_decache(vcpu);
 672                                         vcpu->cpu = -1;
 673                                 }
 674                                 mutex_unlock(&vcpu->mutex);
 675                         }
 676                 }
 677         spin_unlock(&kvm_lock);
 678 }
 679
 680 int kvm_dev_ioctl_check_extension(long ext)
 681 {
 682         int r;
 683
 684         switch (ext) {
 685         case KVM_CAP_IRQCHIP:
 686         case KVM_CAP_HLT:
 687         case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
 688         case KVM_CAP_USER_MEMORY:
 689         case KVM_CAP_SET_TSS_ADDR:
 690         case KVM_CAP_EXT_CPUID:
 691                 r = 1;
 692                 break;
 693         case KVM_CAP_VAPIC:
 694                 r = !kvm_x86_ops->cpu_has_accelerated_tpr();
 695                 break;
 696         default:
 697                 r = 0;
 698                 break;
 699         }
 700         return r;
 701
 702 }
 703
 704 long kvm_arch_dev_ioctl(struct file *filp,
 705                         unsigned int ioctl, unsigned long arg)
 706 {
 707         void __user *argp = (void __user *)arg;
 708         long r;
 709
 710         switch (ioctl) {
 711         case KVM_GET_MSR_INDEX_LIST: {
 712                 struct kvm_msr_list __user *user_msr_list = argp;
 713                 struct kvm_msr_list msr_list;
 714                 unsigned n;
 715
 716                 r = -EFAULT;
 717                 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
 718                         goto out;
 719                 n = msr_list.nmsrs;
 720                 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
 721                 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
 722                         goto out;
 723                 r = -E2BIG;
 724                 if (n < num_msrs_to_save)
 725                         goto out;
 726                 r = -EFAULT;
 727                 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
 728                                  num_msrs_to_save * sizeof(u32)))
 729                         goto out;
 730                 if (copy_to_user(user_msr_list->indices
 731                                  + num_msrs_to_save * sizeof(u32),
 732                                  &emulated_msrs,
 733                                  ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
 734                         goto out;
 735                 r = 0;
 736                 break;
 737         }
 738         case KVM_GET_SUPPORTED_CPUID: {
 739                 struct kvm_cpuid2 __user *cpuid_arg = argp;
 740                 struct kvm_cpuid2 cpuid;
 741
 742                 r = -EFAULT;
 743                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
 744                         goto out;
 745                 r = kvm_dev_ioctl_get_supported_cpuid(&cpuid,
 746                         cpuid_arg->entries);
 747                 if (r)
 748                         goto out;
 749
 750                 r = -EFAULT;
 751                 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
 752                         goto out;
 753                 r = 0;
 754                 break;
 755         }
 756         default:
 757                 r = -EINVAL;
 758         }
 759 out:
 760         return r;
 761 }
 762
 763 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 764 {
 765         kvm_x86_ops->vcpu_load(vcpu, cpu);
 766 }
 767
 768 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 769 {
 770         kvm_x86_ops->vcpu_put(vcpu);
 771         kvm_put_guest_fpu(vcpu);
 772 }
 773
 774 static int is_efer_nx(void)
 775 {
 776         u64 efer;
 777
 778         rdmsrl(MSR_EFER, efer);
 779         return efer & EFER_NX;
 780 }
 781
 782 static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
 783 {
 784         int i;
 785         struct kvm_cpuid_entry2 *e, *entry;
 786
 787         entry = NULL;
 788         for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
 789                 e = &vcpu->arch.cpuid_entries[i];
 790                 if (e->function == 0x80000001) {
 791                         entry = e;
 792                         break;
 793                 }
 794         }
 795         if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) {
 796                 entry->edx &= ~(1 << 20);
 797                 printk(KERN_INFO "kvm: guest NX capability removed\n");
 798         }
 799 }
 800
 801 /* when an old userspace process fills a new kernel module */
 802 static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
 803                                     struct kvm_cpuid *cpuid,
 804                                     struct kvm_cpuid_entry __user *entries)
 805 {
 806         int r, i;
 807         struct kvm_cpuid_entry *cpuid_entries;
 808
 809         r = -E2BIG;
 810         if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
 811                 goto out;
 812         r = -ENOMEM;
 813         cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent);
 814         if (!cpuid_entries)
 815                 goto out;
 816         r = -EFAULT;
 817         if (copy_from_user(cpuid_entries, entries,
 818                            cpuid->nent * sizeof(struct kvm_cpuid_entry)))
 819                 goto out_free;
 820         for (i = 0; i < cpuid->nent; i++) {
 821                 vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function;
 822                 vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax;
 823                 vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx;
 824                 vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx;
 825                 vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx;
 826                 vcpu->arch.cpuid_entries[i].index = 0;
 827                 vcpu->arch.cpuid_entries[i].flags = 0;
 828                 vcpu->arch.cpuid_entries[i].padding[0] = 0;
 829                 vcpu->arch.cpuid_entries[i].padding[1] = 0;
 830                 vcpu->arch.cpuid_entries[i].padding[2] = 0;
 831         }
 832         vcpu->arch.cpuid_nent = cpuid->nent;
 833         cpuid_fix_nx_cap(vcpu);
 834         r = 0;
 835
 836 out_free:
 837         vfree(cpuid_entries);
 838 out:
 839         return r;
 840 }
 841
 842 static int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
 843                                     struct kvm_cpuid2 *cpuid,
 844                                     struct kvm_cpuid_entry2 __user *entries)
 845 {
 846         int r;
 847
 848         r = -E2BIG;
 849         if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
 850                 goto out;
 851         r = -EFAULT;
 852         if (copy_from_user(&vcpu->arch.cpuid_entries, entries,
 853                            cpuid->nent * sizeof(struct kvm_cpuid_entry2)))
 854                 goto out;
 855         vcpu->arch.cpuid_nent = cpuid->nent;
 856         return 0;
 857
 858 out:
 859         return r;
 860 }
 861
 862 static int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
 863                                     struct kvm_cpuid2 *cpuid,
 864                                     struct kvm_cpuid_entry2 __user *entries)
 865 {
 866         int r;
 867
 868         r = -E2BIG;
 869         if (cpuid->nent < vcpu->arch.cpuid_nent)
 870                 goto out;
 871         r = -EFAULT;
 872         if (copy_to_user(entries, &vcpu->arch.cpuid_entries,
 873                            vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2)))
 874                 goto out;
 875         return 0;
 876
 877 out:
 878         cpuid->nent = vcpu->arch.cpuid_nent;
 879         return r;
 880 }
 881
 882 static inline u32 bit(int bitno)
 883 {
 884         return 1 << (bitno & 31);
 885 }
 886
 887 static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function,
 888                           u32 index)
 889 {
 890         entry->function = function;
 891         entry->index = index;
 892         cpuid_count(entry->function, entry->index,
 893                 &entry->eax, &entry->ebx, &entry->ecx, &entry->edx);
 894         entry->flags = 0;
 895 }
 896
 897 static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
 898                          u32 index, int *nent, int maxnent)
 899 {
 900         const u32 kvm_supported_word0_x86_features = bit(X86_FEATURE_FPU) |
 901                 bit(X86_FEATURE_VME) | bit(X86_FEATURE_DE) |
 902                 bit(X86_FEATURE_PSE) | bit(X86_FEATURE_TSC) |
 903                 bit(X86_FEATURE_MSR) | bit(X86_FEATURE_PAE) |
 904                 bit(X86_FEATURE_CX8) | bit(X86_FEATURE_APIC) |
 905                 bit(X86_FEATURE_SEP) | bit(X86_FEATURE_PGE) |
 906                 bit(X86_FEATURE_CMOV) | bit(X86_FEATURE_PSE36) |
 907                 bit(X86_FEATURE_CLFLSH) | bit(X86_FEATURE_MMX) |
 908                 bit(X86_FEATURE_FXSR) | bit(X86_FEATURE_XMM) |
 909                 bit(X86_FEATURE_XMM2) | bit(X86_FEATURE_SELFSNOOP);
 910         const u32 kvm_supported_word1_x86_features = bit(X86_FEATURE_FPU) |
 911                 bit(X86_FEATURE_VME) | bit(X86_FEATURE_DE) |
 912                 bit(X86_FEATURE_PSE) | bit(X86_FEATURE_TSC) |
 913                 bit(X86_FEATURE_MSR) | bit(X86_FEATURE_PAE) |
 914                 bit(X86_FEATURE_CX8) | bit(X86_FEATURE_APIC) |
 915                 bit(X86_FEATURE_PGE) |
 916                 bit(X86_FEATURE_CMOV) | bit(X86_FEATURE_PSE36) |
 917                 bit(X86_FEATURE_MMX) | bit(X86_FEATURE_FXSR) |
 918                 bit(X86_FEATURE_SYSCALL) |
 919                 (bit(X86_FEATURE_NX) && is_efer_nx()) |
 920 #ifdef CONFIG_X86_64
 921                 bit(X86_FEATURE_LM) |
 922 #endif
 923                 bit(X86_FEATURE_MMXEXT) |
 924                 bit(X86_FEATURE_3DNOWEXT) |
 925                 bit(X86_FEATURE_3DNOW);
 926         const u32 kvm_supported_word3_x86_features =
 927                 bit(X86_FEATURE_XMM3) | bit(X86_FEATURE_CX16);
 928         const u32 kvm_supported_word6_x86_features =
 929                 bit(X86_FEATURE_LAHF_LM) | bit(X86_FEATURE_CMP_LEGACY);
 930
 931         /* all func 2 cpuid_count() should be called on the same cpu */
 932         get_cpu();
 933         do_cpuid_1_ent(entry, function, index);
 934         ++*nent;
 935
 936         switch (function) {
 937         case 0:
 938                 entry->eax = min(entry->eax, (u32)0xb);
 939                 break;
 940         case 1:
 941                 entry->edx &= kvm_supported_word0_x86_features;
 942                 entry->ecx &= kvm_supported_word3_x86_features;
 943                 break;
 944         /* function 2 entries are STATEFUL. That is, repeated cpuid commands
 945          * may return different values. This forces us to get_cpu() before
 946          * issuing the first command, and also to emulate this annoying behavior
 947          * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */
 948         case 2: {
 949                 int t, times = entry->eax & 0xff;
 950
 951                 entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
 952                 for (t = 1; t < times && *nent < maxnent; ++t) {
 953                         do_cpuid_1_ent(&entry[t], function, 0);
 954                         entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
 955                         ++*nent;
 956                 }
 957                 break;
 958         }
 959         /* function 4 and 0xb have additional index. */
 960         case 4: {
 961                 int index, cache_type;
 962
 963                 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
 964                 /* read more entries until cache_type is zero */
 965                 for (index = 1; *nent < maxnent; ++index) {
 966                         cache_type = entry[index - 1].eax & 0x1f;
 967                         if (!cache_type)
 968                                 break;
 969                         do_cpuid_1_ent(&entry[index], function, index);
 970                         entry[index].flags |=
 971                                KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
 972                         ++*nent;
 973                 }
 974                 break;
 975         }
 976         case 0xb: {
 977                 int index, level_type;
 978
 979                 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
 980                 /* read more entries until level_type is zero */
 981                 for (index = 1; *nent < maxnent; ++index) {
 982                         level_type = entry[index - 1].ecx & 0xff;
 983                         if (!level_type)
 984                                 break;
 985                         do_cpuid_1_ent(&entry[index], function, index);
 986                         entry[index].flags |=
 987                                KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
 988                         ++*nent;
 989                 }
 990                 break;
 991         }
 992         case 0x80000000:
 993                 entry->eax = min(entry->eax, 0x8000001a);
 994                 break;
 995         case 0x80000001:
 996                 entry->edx &= kvm_supported_word1_x86_features;
 997                 entry->ecx &= kvm_supported_word6_x86_features;
 998                 break;
 999         }
1000         put_cpu();
1001 }
1002
1003 static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
1004                                     struct kvm_cpuid_entry2 __user *entries)
1005 {
1006         struct kvm_cpuid_entry2 *cpuid_entries;
1007         int limit, nent = 0, r = -E2BIG;
1008         u32 func;
1009
1010         if (cpuid->nent < 1)
1011                 goto out;
1012         r = -ENOMEM;
1013         cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent);
1014         if (!cpuid_entries)
1015                 goto out;
1016
1017         do_cpuid_ent(&cpuid_entries[0], 0, 0, &nent, cpuid->nent);
1018         limit = cpuid_entries[0].eax;
1019         for (func = 1; func <= limit && nent < cpuid->nent; ++func)
1020                 do_cpuid_ent(&cpuid_entries[nent], func, 0,
1021                                 &nent, cpuid->nent);
1022         r = -E2BIG;
1023         if (nent >= cpuid->nent)
1024                 goto out_free;
1025
1026         do_cpuid_ent(&cpuid_entries[nent], 0x80000000, 0, &nent, cpuid->nent);
1027         limit = cpuid_entries[nent - 1].eax;
1028         for (func = 0x80000001; func <= limit && nent < cpuid->nent; ++func)
1029                 do_cpuid_ent(&cpuid_entries[nent], func, 0,
1030                                &nent, cpuid->nent);
1031         r = -EFAULT;
1032         if (copy_to_user(entries, cpuid_entries,
1033                         nent * sizeof(struct kvm_cpuid_entry2)))
1034                 goto out_free;
1035         cpuid->nent = nent;
1036         r = 0;
1037
1038 out_free:
1039         vfree(cpuid_entries);
1040 out:
1041         return r;
1042 }
1043
1044 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
1045                                     struct kvm_lapic_state *s)
1046 {
1047         vcpu_load(vcpu);
1048         memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s);
1049         vcpu_put(vcpu);
1050
1051         return 0;
1052 }
1053
1054 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
1055                                     struct kvm_lapic_state *s)
1056 {
1057         vcpu_load(vcpu);
1058         memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
1059         kvm_apic_post_state_restore(vcpu);
1060         vcpu_put(vcpu);
1061
1062         return 0;
1063 }
1064
1065 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
1066                                     struct kvm_interrupt *irq)
1067 {
1068         if (irq->irq < 0 || irq->irq >= 256)
1069                 return -EINVAL;
1070         if (irqchip_in_kernel(vcpu->kvm))
1071                 return -ENXIO;
1072         vcpu_load(vcpu);
1073
1074         set_bit(irq->irq, vcpu->arch.irq_pending);
1075         set_bit(irq->irq / BITS_PER_LONG, &vcpu->arch.irq_summary);
1076
1077         vcpu_put(vcpu);
1078
1079         return 0;
1080 }
1081
1082 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
1083                                            struct kvm_tpr_access_ctl *tac)
1084 {
1085         if (tac->flags)
1086                 return -EINVAL;
1087         vcpu->arch.tpr_access_reporting = !!tac->enabled;
1088         return 0;
1089 }
1090
1091 long kvm_arch_vcpu_ioctl(struct file *filp,
1092                          unsigned int ioctl, unsigned long arg)
1093 {
1094         struct kvm_vcpu *vcpu = filp->private_data;
1095         void __user *argp = (void __user *)arg;
1096         int r;
1097
1098         switch (ioctl) {
1099         case KVM_GET_LAPIC: {
1100                 struct kvm_lapic_state lapic;
1101
1102                 memset(&lapic, 0, sizeof lapic);
1103                 r = kvm_vcpu_ioctl_get_lapic(vcpu, &lapic);
1104                 if (r)
1105                         goto out;
1106                 r = -EFAULT;
1107                 if (copy_to_user(argp, &lapic, sizeof lapic))
1108                         goto out;
1109                 r = 0;
1110                 break;
1111         }
1112         case KVM_SET_LAPIC: {
1113                 struct kvm_lapic_state lapic;
1114
1115                 r = -EFAULT;
1116                 if (copy_from_user(&lapic, argp, sizeof lapic))
1117                         goto out;
1118                 r = kvm_vcpu_ioctl_set_lapic(vcpu, &lapic);;
1119                 if (r)
1120                         goto out;
1121                 r = 0;
1122                 break;
1123         }
1124         case KVM_INTERRUPT: {
1125                 struct kvm_interrupt irq;
1126
1127                 r = -EFAULT;
1128                 if (copy_from_user(&irq, argp, sizeof irq))
1129                         goto out;
1130                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
1131                 if (r)
1132                         goto out;
1133                 r = 0;
1134                 break;
1135         }
1136         case KVM_SET_CPUID: {
1137                 struct kvm_cpuid __user *cpuid_arg = argp;
1138                 struct kvm_cpuid cpuid;
1139
1140                 r = -EFAULT;
1141                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1142                         goto out;
1143                 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
1144                 if (r)
1145                         goto out;
1146                 break;
1147         }
1148         case KVM_SET_CPUID2: {
1149                 struct kvm_cpuid2 __user *cpuid_arg = argp;
1150                 struct kvm_cpuid2 cpuid;
1151
1152                 r = -EFAULT;
1153                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1154                         goto out;
1155                 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
1156                                 cpuid_arg->entries);
1157                 if (r)
1158                         goto out;
1159                 break;
1160         }
1161         case KVM_GET_CPUID2: {
1162                 struct kvm_cpuid2 __user *cpuid_arg = argp;
1163                 struct kvm_cpuid2 cpuid;
1164
1165                 r = -EFAULT;
1166                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1167                         goto out;
1168                 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
1169                                 cpuid_arg->entries);
1170                 if (r)
1171                         goto out;
1172                 r = -EFAULT;
1173                 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
1174                         goto out;
1175                 r = 0;
1176                 break;
1177         }
1178         case KVM_GET_MSRS:
1179                 r = msr_io(vcpu, argp, kvm_get_msr, 1);
1180                 break;
1181         case KVM_SET_MSRS:
1182                 r = msr_io(vcpu, argp, do_set_msr, 0);
1183                 break;
1184         case KVM_TPR_ACCESS_REPORTING: {
1185                 struct kvm_tpr_access_ctl tac;
1186
1187                 r = -EFAULT;
1188                 if (copy_from_user(&tac, argp, sizeof tac))
1189                         goto out;
1190                 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac);
1191                 if (r)
1192                         goto out;
1193                 r = -EFAULT;
1194                 if (copy_to_user(argp, &tac, sizeof tac))
1195                         goto out;
1196                 r = 0;
1197                 break;
1198         };
1199         case KVM_SET_VAPIC_ADDR: {
1200                 struct kvm_vapic_addr va;
1201
1202                 r = -EINVAL;
1203                 if (!irqchip_in_kernel(vcpu->kvm))
1204                         goto out;
1205                 r = -EFAULT;
1206                 if (copy_from_user(&va, argp, sizeof va))
1207                         goto out;
1208                 r = 0;
1209                 kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr);
1210                 break;
1211         }
1212         default:
1213                 r = -EINVAL;
1214         }
1215 out:
1216         return r;
1217 }
1218
1219 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
1220 {
1221         int ret;
1222
1223         if (addr > (unsigned int)(-3 * PAGE_SIZE))
1224                 return -1;
1225         ret = kvm_x86_ops->set_tss_addr(kvm, addr);
1226         return ret;
1227 }
1228
1229 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
1230                                           u32 kvm_nr_mmu_pages)
1231 {
1232         if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
1233                 return -EINVAL;
1234
1235         down_write(&current->mm->mmap_sem);
1236
1237         kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
1238         kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
1239
1240         up_write(&current->mm->mmap_sem);
1241         return 0;
1242 }
1243
1244 static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
1245 {
1246         return kvm->arch.n_alloc_mmu_pages;
1247 }
1248
1249 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
1250 {
1251         int i;
1252         struct kvm_mem_alias *alias;
1253
1254         for (i = 0; i < kvm->arch.naliases; ++i) {
1255                 alias = &kvm->arch.aliases[i];
1256                 if (gfn >= alias->base_gfn
1257                     && gfn < alias->base_gfn + alias->npages)
1258                         return alias->target_gfn + gfn - alias->base_gfn;
1259         }
1260         return gfn;
1261 }
1262
1263 /*
1264  * Set a new alias region.  Aliases map a portion of physical memory into
1265  * another portion.  This is useful for memory windows, for example the PC
1266  * VGA region.
1267  */
1268 static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
1269                                          struct kvm_memory_alias *alias)
1270 {
1271         int r, n;
1272         struct kvm_mem_alias *p;
1273
1274         r = -EINVAL;
1275         /* General sanity checks */
1276         if (alias->memory_size & (PAGE_SIZE - 1))
1277                 goto out;
1278         if (alias->guest_phys_addr & (PAGE_SIZE - 1))
1279                 goto out;
1280         if (alias->slot >= KVM_ALIAS_SLOTS)
1281                 goto out;
1282         if (alias->guest_phys_addr + alias->memory_size
1283             < alias->guest_phys_addr)
1284                 goto out;
1285         if (alias->target_phys_addr + alias->memory_size
1286             < alias->target_phys_addr)
1287                 goto out;
1288
1289         down_write(&current->mm->mmap_sem);
1290
1291         p = &kvm->arch.aliases[alias->slot];
1292         p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
1293         p->npages = alias->memory_size >> PAGE_SHIFT;
1294         p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
1295
1296         for (n = KVM_ALIAS_SLOTS; n > 0; --n)
1297                 if (kvm->arch.aliases[n - 1].npages)
1298                         break;
1299         kvm->arch.naliases = n;
1300
1301         kvm_mmu_zap_all(kvm);
1302
1303         up_write(&current->mm->mmap_sem);
1304
1305         return 0;
1306
1307 out:
1308         return r;
1309 }
1310
1311 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
1312 {
1313         int r;
1314
1315         r = 0;
1316         switch (chip->chip_id) {
1317         case KVM_IRQCHIP_PIC_MASTER:
1318                 memcpy(&chip->chip.pic,
1319                         &pic_irqchip(kvm)->pics[0],
1320                         sizeof(struct kvm_pic_state));
1321                 break;
1322         case KVM_IRQCHIP_PIC_SLAVE:
1323                 memcpy(&chip->chip.pic,
1324                         &pic_irqchip(kvm)->pics[1],
1325                         sizeof(struct kvm_pic_state));
1326                 break;
1327         case KVM_IRQCHIP_IOAPIC:
1328                 memcpy(&chip->chip.ioapic,
1329                         ioapic_irqchip(kvm),
1330                         sizeof(struct kvm_ioapic_state));
1331                 break;
1332         default:
1333                 r = -EINVAL;
1334                 break;
1335         }
1336         return r;
1337 }
1338
1339 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
1340 {
1341         int r;
1342
1343         r = 0;
1344         switch (chip->chip_id) {
1345         case KVM_IRQCHIP_PIC_MASTER:
1346                 memcpy(&pic_irqchip(kvm)->pics[0],
1347                         &chip->chip.pic,
1348                         sizeof(struct kvm_pic_state));
1349                 break;
1350         case KVM_IRQCHIP_PIC_SLAVE:
1351                 memcpy(&pic_irqchip(kvm)->pics[1],
1352                         &chip->chip.pic,
1353                         sizeof(struct kvm_pic_state));
1354                 break;
1355         case KVM_IRQCHIP_IOAPIC:
1356                 memcpy(ioapic_irqchip(kvm),
1357                         &chip->chip.ioapic,
1358                         sizeof(struct kvm_ioapic_state));
1359                 break;
1360         default:
1361                 r = -EINVAL;
1362                 break;
1363         }
1364         kvm_pic_update_irq(pic_irqchip(kvm));
1365         return r;
1366 }
1367
1368 /*
1369  * Get (and clear) the dirty memory log for a memory slot.
1370  */
1371 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
1372                                       struct kvm_dirty_log *log)
1373 {
1374         int r;
1375         int n;
1376         struct kvm_memory_slot *memslot;
1377         int is_dirty = 0;
1378
1379         down_write(&current->mm->mmap_sem);
1380
1381         r = kvm_get_dirty_log(kvm, log, &is_dirty);
1382         if (r)
1383                 goto out;
1384
1385         /* If nothing is dirty, don't bother messing with page tables. */
1386         if (is_dirty) {
1387                 kvm_mmu_slot_remove_write_access(kvm, log->slot);
1388                 kvm_flush_remote_tlbs(kvm);
1389                 memslot = &kvm->memslots[log->slot];
1390                 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
1391                 memset(memslot->dirty_bitmap, 0, n);
1392         }
1393         r = 0;
1394 out:
1395         up_write(&current->mm->mmap_sem);
1396         return r;
1397 }
1398
1399 long kvm_arch_vm_ioctl(struct file *filp,
1400                        unsigned int ioctl, unsigned long arg)
1401 {
1402         struct kvm *kvm = filp->private_data;
1403         void __user *argp = (void __user *)arg;
1404         int r = -EINVAL;
1405
1406         switch (ioctl) {
1407         case KVM_SET_TSS_ADDR:
1408                 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
1409                 if (r < 0)
1410                         goto out;
1411                 break;
1412         case KVM_SET_MEMORY_REGION: {
1413                 struct kvm_memory_region kvm_mem;
1414                 struct kvm_userspace_memory_region kvm_userspace_mem;
1415
1416                 r = -EFAULT;
1417                 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
1418                         goto out;
1419                 kvm_userspace_mem.slot = kvm_mem.slot;
1420                 kvm_userspace_mem.flags = kvm_mem.flags;
1421                 kvm_userspace_mem.guest_phys_addr = kvm_mem.guest_phys_addr;
1422                 kvm_userspace_mem.memory_size = kvm_mem.memory_size;
1423                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 0);
1424                 if (r)
1425                         goto out;
1426                 break;
1427         }
1428         case KVM_SET_NR_MMU_PAGES:
1429                 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
1430                 if (r)
1431                         goto out;
1432                 break;
1433         case KVM_GET_NR_MMU_PAGES:
1434                 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
1435                 break;
1436         case KVM_SET_MEMORY_ALIAS: {
1437                 struct kvm_memory_alias alias;
1438
1439                 r = -EFAULT;
1440                 if (copy_from_user(&alias, argp, sizeof alias))
1441                         goto out;
1442                 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
1443                 if (r)
1444                         goto out;
1445                 break;
1446         }
1447         case KVM_CREATE_IRQCHIP:
1448                 r = -ENOMEM;
1449                 kvm->arch.vpic = kvm_create_pic(kvm);
1450                 if (kvm->arch.vpic) {
1451                         r = kvm_ioapic_init(kvm);
1452                         if (r) {
1453                                 kfree(kvm->arch.vpic);
1454                                 kvm->arch.vpic = NULL;
1455                                 goto out;
1456                         }
1457                 } else
1458                         goto out;
1459                 break;
1460         case KVM_IRQ_LINE: {
1461                 struct kvm_irq_level irq_event;
1462
1463                 r = -EFAULT;
1464                 if (copy_from_user(&irq_event, argp, sizeof irq_event))
1465                         goto out;
1466                 if (irqchip_in_kernel(kvm)) {
1467                         mutex_lock(&kvm->lock);
1468                         if (irq_event.irq < 16)
1469                                 kvm_pic_set_irq(pic_irqchip(kvm),
1470                                         irq_event.irq,
1471                                         irq_event.level);
1472                         kvm_ioapic_set_irq(kvm->arch.vioapic,
1473                                         irq_event.irq,
1474                                         irq_event.level);
1475                         mutex_unlock(&kvm->lock);
1476                         r = 0;
1477                 }
1478                 break;
1479         }
1480         case KVM_GET_IRQCHIP: {
1481                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
1482                 struct kvm_irqchip chip;
1483
1484                 r = -EFAULT;
1485                 if (copy_from_user(&chip, argp, sizeof chip))
1486                         goto out;
1487                 r = -ENXIO;
1488                 if (!irqchip_in_kernel(kvm))
1489                         goto out;
1490                 r = kvm_vm_ioctl_get_irqchip(kvm, &chip);
1491                 if (r)
1492                         goto out;
1493                 r = -EFAULT;
1494                 if (copy_to_user(argp, &chip, sizeof chip))
1495                         goto out;
1496                 r = 0;
1497                 break;
1498         }
1499         case KVM_SET_IRQCHIP: {
1500                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
1501                 struct kvm_irqchip chip;
1502
1503                 r = -EFAULT;
1504                 if (copy_from_user(&chip, argp, sizeof chip))
1505                         goto out;
1506                 r = -ENXIO;
1507                 if (!irqchip_in_kernel(kvm))
1508                         goto out;
1509                 r = kvm_vm_ioctl_set_irqchip(kvm, &chip);
1510                 if (r)
1511                         goto out;
1512                 r = 0;
1513                 break;
1514         }
1515         default:
1516                 ;
1517         }
1518 out:
1519         return r;
1520 }
1521
1522 static void kvm_init_msr_list(void)
1523 {
1524         u32 dummy[2];
1525         unsigned i, j;
1526
1527         for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1528                 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1529                         continue;
1530                 if (j < i)
1531                         msrs_to_save[j] = msrs_to_save[i];
1532                 j++;
1533         }
1534         num_msrs_to_save = j;
1535 }
1536
1537 /*
1538  * Only apic need an MMIO device hook, so shortcut now..
1539  */
1540 static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
1541                                                 gpa_t addr)
1542 {
1543         struct kvm_io_device *dev;
1544
1545         if (vcpu->arch.apic) {
1546                 dev = &vcpu->arch.apic->dev;
1547                 if (dev->in_range(dev, addr))
1548                         return dev;
1549         }
1550         return NULL;
1551 }
1552
1553
1554 static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
1555                                                 gpa_t addr)
1556 {
1557         struct kvm_io_device *dev;
1558
1559         dev = vcpu_find_pervcpu_dev(vcpu, addr);
1560         if (dev == NULL)
1561                 dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
1562         return dev;
1563 }
1564
1565 int emulator_read_std(unsigned long addr,
1566                              void *val,
1567                              unsigned int bytes,
1568                              struct kvm_vcpu *vcpu)
1569 {
1570         void *data = val;
1571         int r = X86EMUL_CONTINUE;
1572
1573         down_read(&current->mm->mmap_sem);
1574         while (bytes) {
1575                 gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
1576                 unsigned offset = addr & (PAGE_SIZE-1);
1577                 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
1578                 int ret;
1579
1580                 if (gpa == UNMAPPED_GVA) {
1581                         r = X86EMUL_PROPAGATE_FAULT;
1582                         goto out;
1583                 }
1584                 ret = kvm_read_guest(vcpu->kvm, gpa, data, tocopy);
1585                 if (ret < 0) {
1586                         r = X86EMUL_UNHANDLEABLE;
1587                         goto out;
1588                 }
1589
1590                 bytes -= tocopy;
1591                 data += tocopy;
1592                 addr += tocopy;
1593         }
1594 out:
1595         up_read(&current->mm->mmap_sem);
1596         return r;
1597 }
1598 EXPORT_SYMBOL_GPL(emulator_read_std);
1599
1600 static int emulator_read_emulated(unsigned long addr,
1601                                   void *val,
1602                                   unsigned int bytes,
1603                                   struct kvm_vcpu *vcpu)
1604 {
1605         struct kvm_io_device *mmio_dev;
1606         gpa_t                 gpa;
1607
1608         if (vcpu->mmio_read_completed) {
1609                 memcpy(val, vcpu->mmio_data, bytes);
1610                 vcpu->mmio_read_completed = 0;
1611                 return X86EMUL_CONTINUE;
1612         }
1613
1614         down_read(&current->mm->mmap_sem);
1615         gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
1616         up_read(&current->mm->mmap_sem);
1617
1618         /* For APIC access vmexit */
1619         if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
1620                 goto mmio;
1621
1622         if (emulator_read_std(addr, val, bytes, vcpu)
1623                         == X86EMUL_CONTINUE)
1624                 return X86EMUL_CONTINUE;
1625         if (gpa == UNMAPPED_GVA)
1626                 return X86EMUL_PROPAGATE_FAULT;
1627
1628 mmio:
1629         /*
1630          * Is this MMIO handled locally?
1631          */
1632         mutex_lock(&vcpu->kvm->lock);
1633         mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1634         if (mmio_dev) {
1635                 kvm_iodevice_read(mmio_dev, gpa, bytes, val);
1636                 mutex_unlock(&vcpu->kvm->lock);
1637                 return X86EMUL_CONTINUE;
1638         }
1639         mutex_unlock(&vcpu->kvm->lock);
1640
1641         vcpu->mmio_needed = 1;
1642         vcpu->mmio_phys_addr = gpa;
1643         vcpu->mmio_size = bytes;
1644         vcpu->mmio_is_write = 0;
1645
1646         return X86EMUL_UNHANDLEABLE;
1647 }
1648
1649 static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
1650                                const void *val, int bytes)
1651 {
1652         int ret;
1653
1654         down_read(&current->mm->mmap_sem);
1655         ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
1656         if (ret < 0) {
1657                 up_read(&current->mm->mmap_sem);
1658                 return 0;
1659         }
1660         kvm_mmu_pte_write(vcpu, gpa, val, bytes);
1661         up_read(&current->mm->mmap_sem);
1662         return 1;
1663 }
1664
1665 static int emulator_write_emulated_onepage(unsigned long addr,
1666                                            const void *val,
1667                                            unsigned int bytes,
1668                                            struct kvm_vcpu *vcpu)
1669 {
1670         struct kvm_io_device *mmio_dev;
1671         gpa_t                 gpa;
1672
1673         down_read(&current->mm->mmap_sem);
1674         gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
1675         up_read(&current->mm->mmap_sem);
1676
1677         if (gpa == UNMAPPED_GVA) {
1678                 kvm_inject_page_fault(vcpu, addr, 2);
1679                 return X86EMUL_PROPAGATE_FAULT;
1680         }
1681
1682         /* For APIC access vmexit */
1683         if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
1684                 goto mmio;
1685
1686         if (emulator_write_phys(vcpu, gpa, val, bytes))
1687                 return X86EMUL_CONTINUE;
1688
1689 mmio:
1690         /*
1691          * Is this MMIO handled locally?
1692          */
1693         mutex_lock(&vcpu->kvm->lock);
1694         mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1695         if (mmio_dev) {
1696                 kvm_iodevice_write(mmio_dev, gpa, bytes, val);
1697                 mutex_unlock(&vcpu->kvm->lock);
1698                 return X86EMUL_CONTINUE;
1699         }
1700         mutex_unlock(&vcpu->kvm->lock);
1701
1702         vcpu->mmio_needed = 1;
1703         vcpu->mmio_phys_addr = gpa;
1704         vcpu->mmio_size = bytes;
1705         vcpu->mmio_is_write = 1;
1706         memcpy(vcpu->mmio_data, val, bytes);
1707
1708         return X86EMUL_CONTINUE;
1709 }
1710
1711 int emulator_write_emulated(unsigned long addr,
1712                                    const void *val,
1713                                    unsigned int bytes,
1714                                    struct kvm_vcpu *vcpu)
1715 {
1716         /* Crossing a page boundary? */
1717         if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
1718                 int rc, now;
1719
1720                 now = -addr & ~PAGE_MASK;
1721                 rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
1722                 if (rc != X86EMUL_CONTINUE)
1723                         return rc;
1724                 addr += now;
1725                 val += now;
1726                 bytes -= now;
1727         }
1728         return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
1729 }
1730 EXPORT_SYMBOL_GPL(emulator_write_emulated);
1731
1732 static int emulator_cmpxchg_emulated(unsigned long addr,
1733                                      const void *old,
1734                                      const void *new,
1735                                      unsigned int bytes,
1736                                      struct kvm_vcpu *vcpu)
1737 {
1738         static int reported;
1739
1740         if (!reported) {
1741                 reported = 1;
1742                 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1743         }
1744 #ifndef CONFIG_X86_64
1745         /* guests cmpxchg8b have to be emulated atomically */
1746         if (bytes == 8) {
1747                 gpa_t gpa;
1748                 struct page *page;
1749                 char *kaddr;
1750                 u64 val;
1751
1752                 down_read(&current->mm->mmap_sem);
1753                 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
1754
1755                 if (gpa == UNMAPPED_GVA ||
1756                    (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
1757                         goto emul_write;
1758
1759                 if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK))
1760                         goto emul_write;
1761
1762                 val = *(u64 *)new;
1763                 page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
1764                 kaddr = kmap_atomic(page, KM_USER0);
1765                 set_64bit((u64 *)(kaddr + offset_in_page(gpa)), val);
1766                 kunmap_atomic(kaddr, KM_USER0);
1767                 kvm_release_page_dirty(page);
1768         emul_write:
1769                 up_read(&current->mm->mmap_sem);
1770         }
1771 #endif
1772
1773         return emulator_write_emulated(addr, new, bytes, vcpu);
1774 }
1775
1776 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1777 {
1778         return kvm_x86_ops->get_segment_base(vcpu, seg);
1779 }
1780
1781 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1782 {
1783         return X86EMUL_CONTINUE;
1784 }
1785
1786 int emulate_clts(struct kvm_vcpu *vcpu)
1787 {
1788         kvm_x86_ops->set_cr0(vcpu, vcpu->arch.cr0 & ~X86_CR0_TS);
1789         return X86EMUL_CONTINUE;
1790 }
1791
1792 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
1793 {
1794         struct kvm_vcpu *vcpu = ctxt->vcpu;
1795
1796         switch (dr) {
1797         case 0 ... 3:
1798                 *dest = kvm_x86_ops->get_dr(vcpu, dr);
1799                 return X86EMUL_CONTINUE;
1800         default:
1801                 pr_unimpl(vcpu, "%s: unexpected dr %u\n", __FUNCTION__, dr);
1802                 return X86EMUL_UNHANDLEABLE;
1803         }
1804 }
1805
1806 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1807 {
1808         unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1809         int exception;
1810
1811         kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1812         if (exception) {
1813                 /* FIXME: better handling */
1814                 return X86EMUL_UNHANDLEABLE;
1815         }
1816         return X86EMUL_CONTINUE;
1817 }
1818
1819 void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
1820 {
1821         static int reported;
1822         u8 opcodes[4];
1823         unsigned long rip = vcpu->arch.rip;
1824         unsigned long rip_linear;
1825
1826         rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS);
1827
1828         if (reported)
1829                 return;
1830
1831         emulator_read_std(rip_linear, (void *)opcodes, 4, vcpu);
1832
1833         printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n",
1834                context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1835         reported = 1;
1836 }
1837 EXPORT_SYMBOL_GPL(kvm_report_emulation_failure);
1838
1839 struct x86_emulate_ops emulate_ops = {
1840         .read_std            = emulator_read_std,
1841         .read_emulated       = emulator_read_emulated,
1842         .write_emulated      = emulator_write_emulated,
1843         .cmpxchg_emulated    = emulator_cmpxchg_emulated,
1844 };
1845
1846 int emulate_instruction(struct kvm_vcpu *vcpu,
1847                         struct kvm_run *run,
1848                         unsigned long cr2,
1849                         u16 error_code,
1850                         int emulation_type)
1851 {
1852         int r;
1853         struct decode_cache *c;
1854
1855         vcpu->arch.mmio_fault_cr2 = cr2;
1856         kvm_x86_ops->cache_regs(vcpu);
1857
1858         vcpu->mmio_is_write = 0;
1859         vcpu->arch.pio.string = 0;
1860
1861         if (!(emulation_type & EMULTYPE_NO_DECODE)) {
1862                 int cs_db, cs_l;
1863                 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1864
1865                 vcpu->arch.emulate_ctxt.vcpu = vcpu;
1866                 vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
1867                 vcpu->arch.emulate_ctxt.mode =
1868                         (vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)
1869                         ? X86EMUL_MODE_REAL : cs_l
1870                         ? X86EMUL_MODE_PROT64 : cs_db
1871                         ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1872
1873                 if (vcpu->arch.emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1874                         vcpu->arch.emulate_ctxt.cs_base = 0;
1875                         vcpu->arch.emulate_ctxt.ds_base = 0;
1876                         vcpu->arch.emulate_ctxt.es_base = 0;
1877                         vcpu->arch.emulate_ctxt.ss_base = 0;
1878                 } else {
1879                         vcpu->arch.emulate_ctxt.cs_base =
1880                                         get_segment_base(vcpu, VCPU_SREG_CS);
1881                         vcpu->arch.emulate_ctxt.ds_base =
1882                                         get_segment_base(vcpu, VCPU_SREG_DS);
1883                         vcpu->arch.emulate_ctxt.es_base =
1884                                         get_segment_base(vcpu, VCPU_SREG_ES);
1885                         vcpu->arch.emulate_ctxt.ss_base =
1886                                         get_segment_base(vcpu, VCPU_SREG_SS);
1887                 }
1888
1889                 vcpu->arch.emulate_ctxt.gs_base =
1890                                         get_segment_base(vcpu, VCPU_SREG_GS);
1891                 vcpu->arch.emulate_ctxt.fs_base =
1892                                         get_segment_base(vcpu, VCPU_SREG_FS);
1893
1894                 r = x86_decode_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
1895
1896                 /* Reject the instructions other than VMCALL/VMMCALL when
1897                  * try to emulate invalid opcode */
1898                 c = &vcpu->arch.emulate_ctxt.decode;
1899                 if ((emulation_type & EMULTYPE_TRAP_UD) &&
1900                     (!(c->twobyte && c->b == 0x01 &&
1901                       (c->modrm_reg == 0 || c->modrm_reg == 3) &&
1902                        c->modrm_mod == 3 && c->modrm_rm == 1)))
1903                         return EMULATE_FAIL;
1904
1905                 ++vcpu->stat.insn_emulation;
1906                 if (r)  {
1907                         ++vcpu->stat.insn_emulation_fail;
1908                         if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1909                                 return EMULATE_DONE;
1910                         return EMULATE_FAIL;
1911                 }
1912         }
1913
1914         r = x86_emulate_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
1915
1916         if (vcpu->arch.pio.string)
1917                 return EMULATE_DO_MMIO;
1918
1919         if ((r || vcpu->mmio_is_write) && run) {
1920                 run->exit_reason = KVM_EXIT_MMIO;
1921                 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1922                 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1923                 run->mmio.len = vcpu->mmio_size;
1924                 run->mmio.is_write = vcpu->mmio_is_write;
1925         }
1926
1927         if (r) {
1928                 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1929                         return EMULATE_DONE;
1930                 if (!vcpu->mmio_needed) {
1931                         kvm_report_emulation_failure(vcpu, "mmio");
1932                         return EMULATE_FAIL;
1933                 }
1934                 return EMULATE_DO_MMIO;
1935         }
1936
1937         kvm_x86_ops->decache_regs(vcpu);
1938         kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
1939
1940         if (vcpu->mmio_is_write) {
1941                 vcpu->mmio_needed = 0;
1942                 return EMULATE_DO_MMIO;
1943         }
1944
1945         return EMULATE_DONE;
1946 }
1947 EXPORT_SYMBOL_GPL(emulate_instruction);
1948
1949 static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
1950 {
1951         int i;
1952
1953         for (i = 0; i < ARRAY_SIZE(vcpu->arch.pio.guest_pages); ++i)
1954                 if (vcpu->arch.pio.guest_pages[i]) {
1955                         kvm_release_page_dirty(vcpu->arch.pio.guest_pages[i]);
1956                         vcpu->arch.pio.guest_pages[i] = NULL;
1957                 }
1958 }
1959
1960 static int pio_copy_data(struct kvm_vcpu *vcpu)
1961 {
1962         void *p = vcpu->arch.pio_data;
1963         void *q;
1964         unsigned bytes;
1965         int nr_pages = vcpu->arch.pio.guest_pages[1] ? 2 : 1;
1966
1967         q = vmap(vcpu->arch.pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
1968                  PAGE_KERNEL);
1969         if (!q) {
1970                 free_pio_guest_pages(vcpu);
1971                 return -ENOMEM;
1972         }
1973         q += vcpu->arch.pio.guest_page_offset;
1974         bytes = vcpu->arch.pio.size * vcpu->arch.pio.cur_count;
1975         if (vcpu->arch.pio.in)
1976                 memcpy(q, p, bytes);
1977         else
1978                 memcpy(p, q, bytes);
1979         q -= vcpu->arch.pio.guest_page_offset;
1980         vunmap(q);
1981         free_pio_guest_pages(vcpu);
1982         return 0;
1983 }
1984
1985 int complete_pio(struct kvm_vcpu *vcpu)
1986 {
1987         struct kvm_pio_request *io = &vcpu->arch.pio;
1988         long delta;
1989         int r;
1990
1991         kvm_x86_ops->cache_regs(vcpu);
1992
1993         if (!io->string) {
1994                 if (io->in)
1995                         memcpy(&vcpu->arch.regs[VCPU_REGS_RAX], vcpu->arch.pio_data,
1996                                io->size);
1997         } else {
1998                 if (io->in) {
1999                         r = pio_copy_data(vcpu);
2000                         if (r) {
2001                                 kvm_x86_ops->cache_regs(vcpu);
2002                                 return r;
2003                         }
2004                 }
2005
2006                 delta = 1;
2007                 if (io->rep) {
2008                         delta *= io->cur_count;
2009                         /*
2010                          * The size of the register should really depend on
2011                          * current address size.
2012                          */
2013                         vcpu->arch.regs[VCPU_REGS_RCX] -= delta;
2014                 }
2015                 if (io->down)
2016                         delta = -delta;
2017                 delta *= io->size;
2018                 if (io->in)
2019                         vcpu->arch.regs[VCPU_REGS_RDI] += delta;
2020                 else
2021                         vcpu->arch.regs[VCPU_REGS_RSI] += delta;
2022         }
2023
2024         kvm_x86_ops->decache_regs(vcpu);
2025
2026         io->count -= io->cur_count;
2027         io->cur_count = 0;
2028
2029         return 0;
2030 }
2031
2032 static void kernel_pio(struct kvm_io_device *pio_dev,
2033                        struct kvm_vcpu *vcpu,
2034                        void *pd)
2035 {
2036         /* TODO: String I/O for in kernel device */
2037
2038         mutex_lock(&vcpu->kvm->lock);
2039         if (vcpu->arch.pio.in)
2040                 kvm_iodevice_read(pio_dev, vcpu->arch.pio.port,
2041                                   vcpu->arch.pio.size,
2042                                   pd);
2043         else
2044                 kvm_iodevice_write(pio_dev, vcpu->arch.pio.port,
2045                                    vcpu->arch.pio.size,
2046                                    pd);
2047         mutex_unlock(&vcpu->kvm->lock);
2048 }
2049
2050 static void pio_string_write(struct kvm_io_device *pio_dev,
2051                              struct kvm_vcpu *vcpu)
2052 {
2053         struct kvm_pio_request *io = &vcpu->arch.pio;
2054         void *pd = vcpu->arch.pio_data;
2055         int i;
2056
2057         mutex_lock(&vcpu->kvm->lock);
2058         for (i = 0; i < io->cur_count; i++) {
2059                 kvm_iodevice_write(pio_dev, io->port,
2060                                    io->size,
2061                                    pd);
2062                 pd += io->size;
2063         }
2064         mutex_unlock(&vcpu->kvm->lock);
2065 }
2066
2067 static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
2068                                                gpa_t addr)
2069 {
2070         return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
2071 }
2072
2073 int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
2074                   int size, unsigned port)
2075 {
2076         struct kvm_io_device *pio_dev;
2077
2078         vcpu->run->exit_reason = KVM_EXIT_IO;
2079         vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
2080         vcpu->run->io.size = vcpu->arch.pio.size = size;
2081         vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
2082         vcpu->run->io.count = vcpu->arch.pio.count = vcpu->arch.pio.cur_count = 1;
2083         vcpu->run->io.port = vcpu->arch.pio.port = port;
2084         vcpu->arch.pio.in = in;
2085         vcpu->arch.pio.string = 0;
2086         vcpu->arch.pio.down = 0;
2087         vcpu->arch.pio.guest_page_offset = 0;
2088         vcpu->arch.pio.rep = 0;
2089
2090         kvm_x86_ops->cache_regs(vcpu);
2091         memcpy(vcpu->arch.pio_data, &vcpu->arch.regs[VCPU_REGS_RAX], 4);
2092         kvm_x86_ops->decache_regs(vcpu);
2093
2094         kvm_x86_ops->skip_emulated_instruction(vcpu);
2095
2096         pio_dev = vcpu_find_pio_dev(vcpu, port);
2097         if (pio_dev) {
2098                 kernel_pio(pio_dev, vcpu, vcpu->arch.pio_data);
2099                 complete_pio(vcpu);
2100                 return 1;
2101         }
2102         return 0;
2103 }
2104 EXPORT_SYMBOL_GPL(kvm_emulate_pio);
2105
2106 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
2107                   int size, unsigned long count, int down,
2108                   gva_t address, int rep, unsigned port)
2109 {
2110         unsigned now, in_page;
2111         int i, ret = 0;
2112         int nr_pages = 1;
2113         struct page *page;
2114         struct kvm_io_device *pio_dev;
2115
2116         vcpu->run->exit_reason = KVM_EXIT_IO;
2117         vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
2118         vcpu->run->io.size = vcpu->arch.pio.size = size;
2119         vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
2120         vcpu->run->io.count = vcpu->arch.pio.count = vcpu->arch.pio.cur_count = count;
2121         vcpu->run->io.port = vcpu->arch.pio.port = port;
2122         vcpu->arch.pio.in = in;
2123         vcpu->arch.pio.string = 1;
2124         vcpu->arch.pio.down = down;
2125         vcpu->arch.pio.guest_page_offset = offset_in_page(address);
2126         vcpu->arch.pio.rep = rep;
2127
2128         if (!count) {
2129                 kvm_x86_ops->skip_emulated_instruction(vcpu);
2130                 return 1;
2131         }
2132
2133         if (!down)
2134                 in_page = PAGE_SIZE - offset_in_page(address);
2135         else
2136                 in_page = offset_in_page(address) + size;
2137         now = min(count, (unsigned long)in_page / size);
2138         if (!now) {
2139                 /*
2140                  * String I/O straddles page boundary.  Pin two guest pages
2141                  * so that we satisfy atomicity constraints.  Do just one
2142                  * transaction to avoid complexity.
2143                  */
2144                 nr_pages = 2;
2145                 now = 1;
2146         }
2147         if (down) {
2148                 /*
2149                  * String I/O in reverse.  Yuck.  Kill the guest, fix later.
2150                  */
2151                 pr_unimpl(vcpu, "guest string pio down\n");
2152                 kvm_inject_gp(vcpu, 0);
2153                 return 1;
2154         }
2155         vcpu->run->io.count = now;
2156         vcpu->arch.pio.cur_count = now;
2157
2158         if (vcpu->arch.pio.cur_count == vcpu->arch.pio.count)
2159                 kvm_x86_ops->skip_emulated_instruction(vcpu);
2160
2161         for (i = 0; i < nr_pages; ++i) {
2162                 down_read(&current->mm->mmap_sem);
2163                 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
2164                 vcpu->arch.pio.guest_pages[i] = page;
2165                 up_read(&current->mm->mmap_sem);
2166                 if (!page) {
2167                         kvm_inject_gp(vcpu, 0);
2168                         free_pio_guest_pages(vcpu);
2169                         return 1;
2170                 }
2171         }
2172
2173         pio_dev = vcpu_find_pio_dev(vcpu, port);
2174         if (!vcpu->arch.pio.in) {
2175                 /* string PIO write */
2176                 ret = pio_copy_data(vcpu);
2177                 if (ret >= 0 && pio_dev) {
2178                         pio_string_write(pio_dev, vcpu);
2179                         complete_pio(vcpu);
2180                         if (vcpu->arch.pio.count == 0)
2181                                 ret = 1;
2182                 }
2183         } else if (pio_dev)
2184                 pr_unimpl(vcpu, "no string pio read support yet, "
2185                        "port %x size %d count %ld\n",
2186                         port, size, count);
2187
2188         return ret;
2189 }
2190 EXPORT_SYMBOL_GPL(kvm_emulate_pio_string);
2191
2192 int kvm_arch_init(void *opaque)
2193 {
2194         int r;
2195         struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque;
2196
2197         if (kvm_x86_ops) {
2198                 printk(KERN_ERR "kvm: already loaded the other module\n");
2199                 r = -EEXIST;
2200                 goto out;
2201         }
2202
2203         if (!ops->cpu_has_kvm_support()) {
2204                 printk(KERN_ERR "kvm: no hardware support\n");
2205                 r = -EOPNOTSUPP;
2206                 goto out;
2207         }
2208         if (ops->disabled_by_bios()) {
2209                 printk(KERN_ERR "kvm: disabled by bios\n");
2210                 r = -EOPNOTSUPP;
2211                 goto out;
2212         }
2213
2214         r = kvm_mmu_module_init();
2215         if (r)
2216                 goto out;
2217
2218         kvm_init_msr_list();
2219
2220         kvm_x86_ops = ops;
2221         kvm_mmu_set_nonpresent_ptes(0ull, 0ull);
2222         return 0;
2223
2224 out:
2225         return r;
2226 }
2227
2228 void kvm_arch_exit(void)
2229 {
2230         kvm_x86_ops = NULL;
2231         kvm_mmu_module_exit();
2232 }
2233
2234 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
2235 {
2236         ++vcpu->stat.halt_exits;
2237         if (irqchip_in_kernel(vcpu->kvm)) {
2238                 vcpu->arch.mp_state = VCPU_MP_STATE_HALTED;
2239                 kvm_vcpu_block(vcpu);
2240                 if (vcpu->arch.mp_state != VCPU_MP_STATE_RUNNABLE)
2241                         return -EINTR;
2242                 return 1;
2243         } else {
2244                 vcpu->run->exit_reason = KVM_EXIT_HLT;
2245                 return 0;
2246         }
2247 }
2248 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
2249
2250 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
2251 {
2252         unsigned long nr, a0, a1, a2, a3, ret;
2253
2254         kvm_x86_ops->cache_regs(vcpu);
2255
2256         nr = vcpu->arch.regs[VCPU_REGS_RAX];
2257         a0 = vcpu->arch.regs[VCPU_REGS_RBX];
2258         a1 = vcpu->arch.regs[VCPU_REGS_RCX];
2259         a2 = vcpu->arch.regs[VCPU_REGS_RDX];
2260         a3 = vcpu->arch.regs[VCPU_REGS_RSI];
2261
2262         if (!is_long_mode(vcpu)) {
2263                 nr &= 0xFFFFFFFF;
2264                 a0 &= 0xFFFFFFFF;
2265                 a1 &= 0xFFFFFFFF;
2266                 a2 &= 0xFFFFFFFF;
2267                 a3 &= 0xFFFFFFFF;
2268         }
2269
2270         switch (nr) {
2271         case KVM_HC_VAPIC_POLL_IRQ:
2272                 ret = 0;
2273                 break;
2274         default:
2275                 ret = -KVM_ENOSYS;
2276                 break;
2277         }
2278         vcpu->arch.regs[VCPU_REGS_RAX] = ret;
2279         kvm_x86_ops->decache_regs(vcpu);
2280         return 0;
2281 }
2282 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
2283
2284 int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
2285 {
2286         char instruction[3];
2287         int ret = 0;
2288
2289
2290         /*
2291          * Blow out the MMU to ensure that no other VCPU has an active mapping
2292          * to ensure that the updated hypercall appears atomically across all
2293          * VCPUs.
2294          */
2295         kvm_mmu_zap_all(vcpu->kvm);
2296
2297         kvm_x86_ops->cache_regs(vcpu);
2298         kvm_x86_ops->patch_hypercall(vcpu, instruction);
2299         if (emulator_write_emulated(vcpu->arch.rip, instruction, 3, vcpu)
2300             != X86EMUL_CONTINUE)
2301                 ret = -EFAULT;
2302
2303         return ret;
2304 }
2305
2306 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
2307 {
2308         return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
2309 }
2310
2311 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
2312 {
2313         struct descriptor_table dt = { limit, base };
2314
2315         kvm_x86_ops->set_gdt(vcpu, &dt);
2316 }
2317
2318 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
2319 {
2320         struct descriptor_table dt = { limit, base };
2321
2322         kvm_x86_ops->set_idt(vcpu, &dt);
2323 }
2324
2325 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
2326                    unsigned long *rflags)
2327 {
2328         lmsw(vcpu, msw);
2329         *rflags = kvm_x86_ops->get_rflags(vcpu);
2330 }
2331
2332 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
2333 {
2334         kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2335         switch (cr) {
2336         case 0:
2337                 return vcpu->arch.cr0;
2338         case 2:
2339                 return vcpu->arch.cr2;
2340         case 3:
2341                 return vcpu->arch.cr3;
2342         case 4:
2343                 return vcpu->arch.cr4;
2344         case 8:
2345                 return get_cr8(vcpu);
2346         default:
2347                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
2348                 return 0;
2349         }
2350 }
2351
2352 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
2353                      unsigned long *rflags)
2354 {
2355         switch (cr) {
2356         case 0:
2357                 set_cr0(vcpu, mk_cr_64(vcpu->arch.cr0, val));
2358                 *rflags = kvm_x86_ops->get_rflags(vcpu);
2359                 break;
2360         case 2:
2361                 vcpu->arch.cr2 = val;
2362                 break;
2363         case 3:
2364                 set_cr3(vcpu, val);
2365                 break;
2366         case 4:
2367                 set_cr4(vcpu, mk_cr_64(vcpu->arch.cr4, val));
2368                 break;
2369         case 8:
2370                 set_cr8(vcpu, val & 0xfUL);
2371                 break;
2372         default:
2373                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
2374         }
2375 }
2376
2377 static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i)
2378 {
2379         struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i];
2380         int j, nent = vcpu->arch.cpuid_nent;
2381
2382         e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT;
2383         /* when no next entry is found, the current entry[i] is reselected */
2384         for (j = i + 1; j == i; j = (j + 1) % nent) {
2385                 struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j];
2386                 if (ej->function == e->function) {
2387                         ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
2388                         return j;
2389                 }
2390         }
2391         return 0; /* silence gcc, even though control never reaches here */
2392 }
2393
2394 /* find an entry with matching function, matching index (if needed), and that
2395  * should be read next (if it's stateful) */
2396 static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e,
2397         u32 function, u32 index)
2398 {
2399         if (e->function != function)
2400                 return 0;
2401         if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index)
2402                 return 0;
2403         if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) &&
2404                 !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT))
2405                 return 0;
2406         return 1;
2407 }
2408
2409 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
2410 {
2411         int i;
2412         u32 function, index;
2413         struct kvm_cpuid_entry2 *e, *best;
2414
2415         kvm_x86_ops->cache_regs(vcpu);
2416         function = vcpu->arch.regs[VCPU_REGS_RAX];
2417         index = vcpu->arch.regs[VCPU_REGS_RCX];
2418         vcpu->arch.regs[VCPU_REGS_RAX] = 0;
2419         vcpu->arch.regs[VCPU_REGS_RBX] = 0;
2420         vcpu->arch.regs[VCPU_REGS_RCX] = 0;
2421         vcpu->arch.regs[VCPU_REGS_RDX] = 0;
2422         best = NULL;
2423         for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
2424                 e = &vcpu->arch.cpuid_entries[i];
2425                 if (is_matching_cpuid_entry(e, function, index)) {
2426                         if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC)
2427                                 move_to_next_stateful_cpuid_entry(vcpu, i);
2428                         best = e;
2429                         break;
2430                 }
2431                 /*
2432                  * Both basic or both extended?
2433                  */
2434                 if (((e->function ^ function) & 0x80000000) == 0)
2435                         if (!best || e->function > best->function)
2436                                 best = e;
2437         }
2438         if (best) {
2439                 vcpu->arch.regs[VCPU_REGS_RAX] = best->eax;
2440                 vcpu->arch.regs[VCPU_REGS_RBX] = best->ebx;
2441                 vcpu->arch.regs[VCPU_REGS_RCX] = best->ecx;
2442                 vcpu->arch.regs[VCPU_REGS_RDX] = best->edx;
2443         }
2444         kvm_x86_ops->decache_regs(vcpu);
2445         kvm_x86_ops->skip_emulated_instruction(vcpu);
2446 }
2447 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
2448
2449 /*
2450  * Check if userspace requested an interrupt window, and that the
2451  * interrupt window is open.
2452  *
2453  * No need to exit to userspace if we already have an interrupt queued.
2454  */
2455 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu,
2456                                           struct kvm_run *kvm_run)
2457 {
2458         return (!vcpu->arch.irq_summary &&
2459                 kvm_run->request_interrupt_window &&
2460                 vcpu->arch.interrupt_window_open &&
2461                 (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF));
2462 }
2463
2464 static void post_kvm_run_save(struct kvm_vcpu *vcpu,
2465                               struct kvm_run *kvm_run)
2466 {
2467         kvm_run->if_flag = (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
2468         kvm_run->cr8 = get_cr8(vcpu);
2469         kvm_run->apic_base = kvm_get_apic_base(vcpu);
2470         if (irqchip_in_kernel(vcpu->kvm))
2471                 kvm_run->ready_for_interrupt_injection = 1;
2472         else
2473                 kvm_run->ready_for_interrupt_injection =
2474                                         (vcpu->arch.interrupt_window_open &&
2475                                          vcpu->arch.irq_summary == 0);
2476 }
2477
2478 static void vapic_enter(struct kvm_vcpu *vcpu)
2479 {
2480         struct kvm_lapic *apic = vcpu->arch.apic;
2481         struct page *page;
2482
2483         if (!apic || !apic->vapic_addr)
2484                 return;
2485
2486         down_read(&current->mm->mmap_sem);
2487         page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
2488         vcpu->arch.apic->vapic_page = page;
2489         up_read(&current->mm->mmap_sem);
2490 }
2491
2492 static void vapic_exit(struct kvm_vcpu *vcpu)
2493 {
2494         struct kvm_lapic *apic = vcpu->arch.apic;
2495
2496         if (!apic || !apic->vapic_addr)
2497                 return;
2498
2499         kvm_release_page_dirty(apic->vapic_page);
2500         mark_page_dirty(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
2501 }
2502
2503 static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2504 {
2505         int r;
2506
2507         if (unlikely(vcpu->arch.mp_state == VCPU_MP_STATE_SIPI_RECEIVED)) {
2508                 pr_debug("vcpu %d received sipi with vector # %x\n",
2509                        vcpu->vcpu_id, vcpu->arch.sipi_vector);
2510                 kvm_lapic_reset(vcpu);
2511                 r = kvm_x86_ops->vcpu_reset(vcpu);
2512                 if (r)
2513                         return r;
2514                 vcpu->arch.mp_state = VCPU_MP_STATE_RUNNABLE;
2515         }
2516
2517         vapic_enter(vcpu);
2518
2519 preempted:
2520         if (vcpu->guest_debug.enabled)
2521                 kvm_x86_ops->guest_debug_pre(vcpu);
2522
2523 again:
2524         r = kvm_mmu_reload(vcpu);
2525         if (unlikely(r))
2526                 goto out;
2527
2528         if (vcpu->requests) {
2529                 if (test_and_clear_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests))
2530                         __kvm_migrate_apic_timer(vcpu);
2531                 if (test_and_clear_bit(KVM_REQ_REPORT_TPR_ACCESS,
2532                                        &vcpu->requests)) {
2533                         kvm_run->exit_reason = KVM_EXIT_TPR_ACCESS;
2534                         r = 0;
2535                         goto out;
2536                 }
2537         }
2538
2539         kvm_inject_pending_timer_irqs(vcpu);
2540
2541         preempt_disable();
2542
2543         kvm_x86_ops->prepare_guest_switch(vcpu);
2544         kvm_load_guest_fpu(vcpu);
2545
2546         local_irq_disable();
2547
2548         if (need_resched()) {
2549                 local_irq_enable();
2550                 preempt_enable();
2551                 r = 1;
2552                 goto out;
2553         }
2554
2555         if (signal_pending(current)) {
2556                 local_irq_enable();
2557                 preempt_enable();
2558                 r = -EINTR;
2559                 kvm_run->exit_reason = KVM_EXIT_INTR;
2560                 ++vcpu->stat.signal_exits;
2561                 goto out;
2562         }
2563
2564         if (vcpu->arch.exception.pending)
2565                 __queue_exception(vcpu);
2566         else if (irqchip_in_kernel(vcpu->kvm))
2567                 kvm_x86_ops->inject_pending_irq(vcpu);
2568         else
2569                 kvm_x86_ops->inject_pending_vectors(vcpu, kvm_run);
2570
2571         kvm_lapic_sync_to_vapic(vcpu);
2572
2573         vcpu->guest_mode = 1;
2574         kvm_guest_enter();
2575
2576         if (vcpu->requests)
2577                 if (test_and_clear_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
2578                         kvm_x86_ops->tlb_flush(vcpu);
2579
2580         kvm_x86_ops->run(vcpu, kvm_run);
2581
2582         vcpu->guest_mode = 0;
2583         local_irq_enable();
2584
2585         ++vcpu->stat.exits;
2586
2587         /*
2588          * We must have an instruction between local_irq_enable() and
2589          * kvm_guest_exit(), so the timer interrupt isn't delayed by
2590          * the interrupt shadow.  The stat.exits increment will do nicely.
2591          * But we need to prevent reordering, hence this barrier():
2592          */
2593         barrier();
2594
2595         kvm_guest_exit();
2596
2597         preempt_enable();
2598
2599         /*
2600          * Profile KVM exit RIPs:
2601          */
2602         if (unlikely(prof_on == KVM_PROFILING)) {
2603                 kvm_x86_ops->cache_regs(vcpu);
2604                 profile_hit(KVM_PROFILING, (void *)vcpu->arch.rip);
2605         }
2606
2607         if (vcpu->arch.exception.pending && kvm_x86_ops->exception_injected(vcpu))
2608                 vcpu->arch.exception.pending = false;
2609
2610         kvm_lapic_sync_from_vapic(vcpu);
2611
2612         r = kvm_x86_ops->handle_exit(kvm_run, vcpu);
2613
2614         if (r > 0) {
2615                 if (dm_request_for_irq_injection(vcpu, kvm_run)) {
2616                         r = -EINTR;
2617                         kvm_run->exit_reason = KVM_EXIT_INTR;
2618                         ++vcpu->stat.request_irq_exits;
2619                         goto out;
2620                 }
2621                 if (!need_resched())
2622                         goto again;
2623         }
2624
2625 out:
2626         if (r > 0) {
2627                 kvm_resched(vcpu);
2628                 goto preempted;
2629         }
2630
2631         post_kvm_run_save(vcpu, kvm_run);
2632
2633         vapic_exit(vcpu);
2634
2635         return r;
2636 }
2637
2638 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2639 {
2640         int r;
2641         sigset_t sigsaved;
2642
2643         vcpu_load(vcpu);
2644
2645         if (unlikely(vcpu->arch.mp_state == VCPU_MP_STATE_UNINITIALIZED)) {
2646                 kvm_vcpu_block(vcpu);
2647                 vcpu_put(vcpu);
2648                 return -EAGAIN;
2649         }
2650
2651         if (vcpu->sigset_active)
2652                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
2653
2654         /* re-sync apic's tpr */
2655         if (!irqchip_in_kernel(vcpu->kvm))
2656                 set_cr8(vcpu, kvm_run->cr8);
2657
2658         if (vcpu->arch.pio.cur_count) {
2659                 r = complete_pio(vcpu);
2660                 if (r)
2661                         goto out;
2662         }
2663 #if CONFIG_HAS_IOMEM
2664         if (vcpu->mmio_needed) {
2665                 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
2666                 vcpu->mmio_read_completed = 1;
2667                 vcpu->mmio_needed = 0;
2668                 r = emulate_instruction(vcpu, kvm_run,
2669                                         vcpu->arch.mmio_fault_cr2, 0,
2670                                         EMULTYPE_NO_DECODE);
2671                 if (r == EMULATE_DO_MMIO) {
2672                         /*
2673                          * Read-modify-write.  Back to userspace.
2674                          */
2675                         r = 0;
2676                         goto out;
2677                 }
2678         }
2679 #endif
2680         if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
2681                 kvm_x86_ops->cache_regs(vcpu);
2682                 vcpu->arch.regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
2683                 kvm_x86_ops->decache_regs(vcpu);
2684         }
2685
2686         r = __vcpu_run(vcpu, kvm_run);
2687
2688 out:
2689         if (vcpu->sigset_active)
2690                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2691
2692         vcpu_put(vcpu);
2693         return r;
2694 }
2695
2696 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
2697 {
2698         vcpu_load(vcpu);
2699
2700         kvm_x86_ops->cache_regs(vcpu);
2701
2702         regs->rax = vcpu->arch.regs[VCPU_REGS_RAX];
2703         regs->rbx = vcpu->arch.regs[VCPU_REGS_RBX];
2704         regs->rcx = vcpu->arch.regs[VCPU_REGS_RCX];
2705         regs->rdx = vcpu->arch.regs[VCPU_REGS_RDX];
2706         regs->rsi = vcpu->arch.regs[VCPU_REGS_RSI];
2707         regs->rdi = vcpu->arch.regs[VCPU_REGS_RDI];
2708         regs->rsp = vcpu->arch.regs[VCPU_REGS_RSP];
2709         regs->rbp = vcpu->arch.regs[VCPU_REGS_RBP];
2710 #ifdef CONFIG_X86_64
2711         regs->r8 = vcpu->arch.regs[VCPU_REGS_R8];
2712         regs->r9 = vcpu->arch.regs[VCPU_REGS_R9];
2713         regs->r10 = vcpu->arch.regs[VCPU_REGS_R10];
2714         regs->r11 = vcpu->arch.regs[VCPU_REGS_R11];
2715         regs->r12 = vcpu->arch.regs[VCPU_REGS_R12];
2716         regs->r13 = vcpu->arch.regs[VCPU_REGS_R13];
2717         regs->r14 = vcpu->arch.regs[VCPU_REGS_R14];
2718         regs->r15 = vcpu->arch.regs[VCPU_REGS_R15];
2719 #endif
2720
2721         regs->rip = vcpu->arch.rip;
2722         regs->rflags = kvm_x86_ops->get_rflags(vcpu);
2723
2724         /*
2725          * Don't leak debug flags in case they were set for guest debugging
2726          */
2727         if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
2728                 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
2729
2730         vcpu_put(vcpu);
2731
2732         return 0;
2733 }
2734
2735 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
2736 {
2737         vcpu_load(vcpu);
2738
2739         vcpu->arch.regs[VCPU_REGS_RAX] = regs->rax;
2740         vcpu->arch.regs[VCPU_REGS_RBX] = regs->rbx;
2741         vcpu->arch.regs[VCPU_REGS_RCX] = regs->rcx;
2742         vcpu->arch.regs[VCPU_REGS_RDX] = regs->rdx;
2743         vcpu->arch.regs[VCPU_REGS_RSI] = regs->rsi;
2744         vcpu->arch.regs[VCPU_REGS_RDI] = regs->rdi;
2745         vcpu->arch.regs[VCPU_REGS_RSP] = regs->rsp;
2746         vcpu->arch.regs[VCPU_REGS_RBP] = regs->rbp;
2747 #ifdef CONFIG_X86_64
2748         vcpu->arch.regs[VCPU_REGS_R8] = regs->r8;
2749         vcpu->arch.regs[VCPU_REGS_R9] = regs->r9;
2750         vcpu->arch.regs[VCPU_REGS_R10] = regs->r10;
2751         vcpu->arch.regs[VCPU_REGS_R11] = regs->r11;
2752         vcpu->arch.regs[VCPU_REGS_R12] = regs->r12;
2753         vcpu->arch.regs[VCPU_REGS_R13] = regs->r13;
2754         vcpu->arch.regs[VCPU_REGS_R14] = regs->r14;
2755         vcpu->arch.regs[VCPU_REGS_R15] = regs->r15;
2756 #endif
2757
2758         vcpu->arch.rip = regs->rip;
2759         kvm_x86_ops->set_rflags(vcpu, regs->rflags);
2760
2761         kvm_x86_ops->decache_regs(vcpu);
2762
2763         vcpu_put(vcpu);
2764
2765         return 0;
2766 }
2767
2768 static void get_segment(struct kvm_vcpu *vcpu,
2769                         struct kvm_segment *var, int seg)
2770 {
2771         return kvm_x86_ops->get_segment(vcpu, var, seg);
2772 }
2773
2774 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
2775 {
2776         struct kvm_segment cs;
2777
2778         get_segment(vcpu, &cs, VCPU_SREG_CS);
2779         *db = cs.db;
2780         *l = cs.l;
2781 }
2782 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
2783
2784 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
2785                                   struct kvm_sregs *sregs)
2786 {
2787         struct descriptor_table dt;
2788         int pending_vec;
2789
2790         vcpu_load(vcpu);
2791
2792         get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2793         get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2794         get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2795         get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2796         get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2797         get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2798
2799         get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2800         get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2801
2802         kvm_x86_ops->get_idt(vcpu, &dt);
2803         sregs->idt.limit = dt.limit;
2804         sregs->idt.base = dt.base;
2805         kvm_x86_ops->get_gdt(vcpu, &dt);
2806         sregs->gdt.limit = dt.limit;
2807         sregs->gdt.base = dt.base;
2808
2809         kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2810         sregs->cr0 = vcpu->arch.cr0;
2811         sregs->cr2 = vcpu->arch.cr2;
2812         sregs->cr3 = vcpu->arch.cr3;
2813         sregs->cr4 = vcpu->arch.cr4;
2814         sregs->cr8 = get_cr8(vcpu);
2815         sregs->efer = vcpu->arch.shadow_efer;
2816         sregs->apic_base = kvm_get_apic_base(vcpu);
2817
2818         if (irqchip_in_kernel(vcpu->kvm)) {
2819                 memset(sregs->interrupt_bitmap, 0,
2820                        sizeof sregs->interrupt_bitmap);
2821                 pending_vec = kvm_x86_ops->get_irq(vcpu);
2822                 if (pending_vec >= 0)
2823                         set_bit(pending_vec,
2824                                 (unsigned long *)sregs->interrupt_bitmap);
2825         } else
2826                 memcpy(sregs->interrupt_bitmap, vcpu->arch.irq_pending,
2827                        sizeof sregs->interrupt_bitmap);
2828
2829         vcpu_put(vcpu);
2830
2831         return 0;
2832 }
2833
2834 static void set_segment(struct kvm_vcpu *vcpu,
2835                         struct kvm_segment *var, int seg)
2836 {
2837         return kvm_x86_ops->set_segment(vcpu, var, seg);
2838 }
2839
2840 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2841                                   struct kvm_sregs *sregs)
2842 {
2843         int mmu_reset_needed = 0;
2844         int i, pending_vec, max_bits;
2845         struct descriptor_table dt;
2846
2847         vcpu_load(vcpu);
2848
2849         dt.limit = sregs->idt.limit;
2850         dt.base = sregs->idt.base;
2851         kvm_x86_ops->set_idt(vcpu, &dt);
2852         dt.limit = sregs->gdt.limit;
2853         dt.base = sregs->gdt.base;
2854         kvm_x86_ops->set_gdt(vcpu, &dt);
2855
2856         vcpu->arch.cr2 = sregs->cr2;
2857         mmu_reset_needed |= vcpu->arch.cr3 != sregs->cr3;
2858         vcpu->arch.cr3 = sregs->cr3;
2859
2860         set_cr8(vcpu, sregs->cr8);
2861
2862         mmu_reset_needed |= vcpu->arch.shadow_efer != sregs->efer;
2863 #ifdef CONFIG_X86_64
2864         kvm_x86_ops->set_efer(vcpu, sregs->efer);
2865 #endif
2866         kvm_set_apic_base(vcpu, sregs->apic_base);
2867
2868         kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2869
2870         mmu_reset_needed |= vcpu->arch.cr0 != sregs->cr0;
2871         kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
2872         vcpu->arch.cr0 = sregs->cr0;
2873
2874         mmu_reset_needed |= vcpu->arch.cr4 != sregs->cr4;
2875         kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
2876         if (!is_long_mode(vcpu) && is_pae(vcpu))
2877                 load_pdptrs(vcpu, vcpu->arch.cr3);
2878
2879         if (mmu_reset_needed)
2880                 kvm_mmu_reset_context(vcpu);
2881
2882         if (!irqchip_in_kernel(vcpu->kvm)) {
2883                 memcpy(vcpu->arch.irq_pending, sregs->interrupt_bitmap,
2884                        sizeof vcpu->arch.irq_pending);
2885                 vcpu->arch.irq_summary = 0;
2886                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.irq_pending); ++i)
2887                         if (vcpu->arch.irq_pending[i])
2888                                 __set_bit(i, &vcpu->arch.irq_summary);
2889         } else {
2890                 max_bits = (sizeof sregs->interrupt_bitmap) << 3;
2891                 pending_vec = find_first_bit(
2892                         (const unsigned long *)sregs->interrupt_bitmap,
2893                         max_bits);
2894                 /* Only pending external irq is handled here */
2895                 if (pending_vec < max_bits) {
2896                         kvm_x86_ops->set_irq(vcpu, pending_vec);
2897                         pr_debug("Set back pending irq %d\n",
2898                                  pending_vec);
2899                 }
2900         }
2901
2902         set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2903         set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2904         set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2905         set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2906         set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2907         set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2908
2909         set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2910         set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2911
2912         vcpu_put(vcpu);
2913
2914         return 0;
2915 }
2916
2917 int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
2918                                     struct kvm_debug_guest *dbg)
2919 {
2920         int r;
2921
2922         vcpu_load(vcpu);
2923
2924         r = kvm_x86_ops->set_guest_debug(vcpu, dbg);
2925
2926         vcpu_put(vcpu);
2927
2928         return r;
2929 }
2930
2931 /*
2932  * fxsave fpu state.  Taken from x86_64/processor.h.  To be killed when
2933  * we have asm/x86/processor.h
2934  */
2935 struct fxsave {
2936         u16     cwd;
2937         u16     swd;
2938         u16     twd;
2939         u16     fop;
2940         u64     rip;
2941         u64     rdp;
2942         u32     mxcsr;
2943         u32     mxcsr_mask;
2944         u32     st_space[32];   /* 8*16 bytes for each FP-reg = 128 bytes */
2945 #ifdef CONFIG_X86_64
2946         u32     xmm_space[64];  /* 16*16 bytes for each XMM-reg = 256 bytes */
2947 #else
2948         u32     xmm_space[32];  /* 8*16 bytes for each XMM-reg = 128 bytes */
2949 #endif
2950 };
2951
2952 /*
2953  * Translate a guest virtual address to a guest physical address.
2954  */
2955 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2956                                     struct kvm_translation *tr)
2957 {
2958         unsigned long vaddr = tr->linear_address;
2959         gpa_t gpa;
2960
2961         vcpu_load(vcpu);
2962         down_read(&current->mm->mmap_sem);
2963         gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, vaddr);
2964         up_read(&current->mm->mmap_sem);
2965         tr->physical_address = gpa;
2966         tr->valid = gpa != UNMAPPED_GVA;
2967         tr->writeable = 1;
2968         tr->usermode = 0;
2969         vcpu_put(vcpu);
2970
2971         return 0;
2972 }
2973
2974 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2975 {
2976         struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
2977
2978         vcpu_load(vcpu);
2979
2980         memcpy(fpu->fpr, fxsave->st_space, 128);
2981         fpu->fcw = fxsave->cwd;
2982         fpu->fsw = fxsave->swd;
2983         fpu->ftwx = fxsave->twd;
2984         fpu->last_opcode = fxsave->fop;
2985         fpu->last_ip = fxsave->rip;
2986         fpu->last_dp = fxsave->rdp;
2987         memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
2988
2989         vcpu_put(vcpu);
2990
2991         return 0;
2992 }
2993
2994 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2995 {
2996         struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
2997
2998         vcpu_load(vcpu);
2999
3000         memcpy(fxsave->st_space, fpu->fpr, 128);
3001         fxsave->cwd = fpu->fcw;
3002         fxsave->swd = fpu->fsw;
3003         fxsave->twd = fpu->ftwx;
3004         fxsave->fop = fpu->last_opcode;
3005         fxsave->rip = fpu->last_ip;
3006         fxsave->rdp = fpu->last_dp;
3007         memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
3008
3009         vcpu_put(vcpu);
3010
3011         return 0;
3012 }
3013
3014 void fx_init(struct kvm_vcpu *vcpu)
3015 {
3016         unsigned after_mxcsr_mask;
3017
3018         /* Initialize guest FPU by resetting ours and saving into guest's */
3019         preempt_disable();
3020         fx_save(&vcpu->arch.host_fx_image);
3021         fpu_init();
3022         fx_save(&vcpu->arch.guest_fx_image);
3023         fx_restore(&vcpu->arch.host_fx_image);
3024         preempt_enable();
3025
3026         vcpu->arch.cr0 |= X86_CR0_ET;
3027         after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
3028         vcpu->arch.guest_fx_image.mxcsr = 0x1f80;
3029         memset((void *)&vcpu->arch.guest_fx_image + after_mxcsr_mask,
3030                0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
3031 }
3032 EXPORT_SYMBOL_GPL(fx_init);
3033
3034 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
3035 {
3036         if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
3037                 return;
3038
3039         vcpu->guest_fpu_loaded = 1;
3040         fx_save(&vcpu->arch.host_fx_image);
3041         fx_restore(&vcpu->arch.guest_fx_image);
3042 }
3043 EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
3044
3045 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
3046 {
3047         if (!vcpu->guest_fpu_loaded)
3048                 return;
3049
3050         vcpu->guest_fpu_loaded = 0;
3051         fx_save(&vcpu->arch.guest_fx_image);
3052         fx_restore(&vcpu->arch.host_fx_image);
3053         ++vcpu->stat.fpu_reload;
3054 }
3055 EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
3056
3057 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
3058 {
3059         kvm_x86_ops->vcpu_free(vcpu);
3060 }
3061
3062 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
3063                                                 unsigned int id)
3064 {
3065         return kvm_x86_ops->vcpu_create(kvm, id);
3066 }
3067
3068 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
3069 {
3070         int r;
3071
3072         /* We do fxsave: this must be aligned. */
3073         BUG_ON((unsigned long)&vcpu->arch.host_fx_image & 0xF);
3074
3075         vcpu_load(vcpu);
3076         r = kvm_arch_vcpu_reset(vcpu);
3077         if (r == 0)
3078                 r = kvm_mmu_setup(vcpu);
3079         vcpu_put(vcpu);
3080         if (r < 0)
3081                 goto free_vcpu;
3082
3083         return 0;
3084 free_vcpu:
3085         kvm_x86_ops->vcpu_free(vcpu);
3086         return r;
3087 }
3088
3089 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
3090 {
3091         vcpu_load(vcpu);
3092         kvm_mmu_unload(vcpu);
3093         vcpu_put(vcpu);
3094
3095         kvm_x86_ops->vcpu_free(vcpu);
3096 }
3097
3098 int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
3099 {
3100         return kvm_x86_ops->vcpu_reset(vcpu);
3101 }
3102
3103 void kvm_arch_hardware_enable(void *garbage)
3104 {
3105         kvm_x86_ops->hardware_enable(garbage);
3106 }
3107
3108 void kvm_arch_hardware_disable(void *garbage)
3109 {
3110         kvm_x86_ops->hardware_disable(garbage);
3111 }
3112
3113 int kvm_arch_hardware_setup(void)
3114 {
3115         return kvm_x86_ops->hardware_setup();
3116 }
3117
3118 void kvm_arch_hardware_unsetup(void)
3119 {
3120         kvm_x86_ops->hardware_unsetup();
3121 }
3122
3123 void kvm_arch_check_processor_compat(void *rtn)
3124 {
3125         kvm_x86_ops->check_processor_compatibility(rtn);
3126 }
3127
3128 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
3129 {
3130         struct page *page;
3131         struct kvm *kvm;
3132         int r;
3133
3134         BUG_ON(vcpu->kvm == NULL);
3135         kvm = vcpu->kvm;
3136
3137         vcpu->arch.mmu.root_hpa = INVALID_PAGE;
3138         if (!irqchip_in_kernel(kvm) || vcpu->vcpu_id == 0)
3139                 vcpu->arch.mp_state = VCPU_MP_STATE_RUNNABLE;
3140         else
3141                 vcpu->arch.mp_state = VCPU_MP_STATE_UNINITIALIZED;
3142
3143         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3144         if (!page) {
3145                 r = -ENOMEM;
3146                 goto fail;
3147         }
3148         vcpu->arch.pio_data = page_address(page);
3149
3150         r = kvm_mmu_create(vcpu);
3151         if (r < 0)
3152                 goto fail_free_pio_data;
3153
3154         if (irqchip_in_kernel(kvm)) {
3155                 r = kvm_create_lapic(vcpu);
3156                 if (r < 0)
3157                         goto fail_mmu_destroy;
3158         }
3159
3160         return 0;
3161
3162 fail_mmu_destroy:
3163         kvm_mmu_destroy(vcpu);
3164 fail_free_pio_data:
3165         free_page((unsigned long)vcpu->arch.pio_data);
3166 fail:
3167         return r;
3168 }
3169
3170 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
3171 {
3172         kvm_free_lapic(vcpu);
3173         kvm_mmu_destroy(vcpu);
3174         free_page((unsigned long)vcpu->arch.pio_data);
3175 }
3176
3177 struct  kvm *kvm_arch_create_vm(void)
3178 {
3179         struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
3180
3181         if (!kvm)
3182                 return ERR_PTR(-ENOMEM);
3183
3184         INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
3185
3186         return kvm;
3187 }
3188
3189 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
3190 {
3191         vcpu_load(vcpu);
3192         kvm_mmu_unload(vcpu);
3193         vcpu_put(vcpu);
3194 }
3195
3196 static void kvm_free_vcpus(struct kvm *kvm)
3197 {
3198         unsigned int i;
3199
3200         /*
3201          * Unpin any mmu pages first.
3202          */
3203         for (i = 0; i < KVM_MAX_VCPUS; ++i)
3204                 if (kvm->vcpus[i])
3205                         kvm_unload_vcpu_mmu(kvm->vcpus[i]);
3206         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
3207                 if (kvm->vcpus[i]) {
3208                         kvm_arch_vcpu_free(kvm->vcpus[i]);
3209                         kvm->vcpus[i] = NULL;
3210                 }
3211         }
3212
3213 }
3214
3215 void kvm_arch_destroy_vm(struct kvm *kvm)
3216 {
3217         kfree(kvm->arch.vpic);
3218         kfree(kvm->arch.vioapic);
3219         kvm_free_vcpus(kvm);
3220         kvm_free_physmem(kvm);
3221         kfree(kvm);
3222 }
3223
3224 int kvm_arch_set_memory_region(struct kvm *kvm,
3225                                 struct kvm_userspace_memory_region *mem,
3226                                 struct kvm_memory_slot old,
3227                                 int user_alloc)
3228 {
3229         int npages = mem->memory_size >> PAGE_SHIFT;
3230         struct kvm_memory_slot *memslot = &kvm->memslots[mem->slot];
3231
3232         /*To keep backward compatibility with older userspace,
3233          *x86 needs to hanlde !user_alloc case.
3234          */
3235         if (!user_alloc) {
3236                 if (npages && !old.rmap) {
3237                         memslot->userspace_addr = do_mmap(NULL, 0,
3238                                                      npages * PAGE_SIZE,
3239                                                      PROT_READ | PROT_WRITE,
3240                                                      MAP_SHARED | MAP_ANONYMOUS,
3241                                                      0);
3242
3243                         if (IS_ERR((void *)memslot->userspace_addr))
3244                                 return PTR_ERR((void *)memslot->userspace_addr);
3245                 } else {
3246                         if (!old.user_alloc && old.rmap) {
3247                                 int ret;
3248
3249                                 ret = do_munmap(current->mm, old.userspace_addr,
3250                                                 old.npages * PAGE_SIZE);
3251                                 if (ret < 0)
3252                                         printk(KERN_WARNING
3253                                        "kvm_vm_ioctl_set_memory_region: "
3254                                        "failed to munmap memory\n");
3255                         }
3256                 }
3257         }
3258
3259         if (!kvm->arch.n_requested_mmu_pages) {
3260                 unsigned int nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
3261                 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
3262         }
3263
3264         kvm_mmu_slot_remove_write_access(kvm, mem->slot);
3265         kvm_flush_remote_tlbs(kvm);
3266
3267         return 0;
3268 }
3269
3270 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
3271 {
3272         return vcpu->arch.mp_state == VCPU_MP_STATE_RUNNABLE
3273                || vcpu->arch.mp_state == VCPU_MP_STATE_SIPI_RECEIVED;
3274 }
3275
3276 static void vcpu_kick_intr(void *info)
3277 {
3278 #ifdef DEBUG
3279         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)info;
3280         printk(KERN_DEBUG "vcpu_kick_intr %p \n", vcpu);
3281 #endif
3282 }
3283
3284 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
3285 {
3286         int ipi_pcpu = vcpu->cpu;
3287
3288         if (waitqueue_active(&vcpu->wq)) {
3289                 wake_up_interruptible(&vcpu->wq);
3290                 ++vcpu->stat.halt_wakeup;
3291         }
3292         if (vcpu->guest_mode)
3293                 smp_call_function_single(ipi_pcpu, vcpu_kick_intr, vcpu, 0, 0);
3294 }