drivers/kvm/vmx.c

   1 /*
   2  * Kernel-based Virtual Machine driver for Linux
   3  *
   4  * This module enables machines with Intel VT-x extensions to run virtual
   5  * machines without emulation or binary translation.
   6  *
   7  * Copyright (C) 2006 Qumranet, Inc.
   8  *
   9  * Authors:
  10  *   Avi Kivity   <avi@qumranet.com>
  11  *   Yaniv Kamay  <yaniv@qumranet.com>
  12  *
  13  * This work is licensed under the terms of the GNU GPL, version 2.  See
  14  * the COPYING file in the top-level directory.
  15  *
  16  */
  17
  18 #include "kvm.h"
  19 #include "vmx.h"
  20 #include "kvm_vmx.h"
  21 #include <linux/module.h>
  22 #include <linux/kernel.h>
  23 #include <linux/mm.h>
  24 #include <linux/highmem.h>
  25 #include <linux/profile.h>
  26 #include <asm/io.h>
  27 #include <asm/desc.h>
  28
  29 #include "segment_descriptor.h"
  30
  31 MODULE_AUTHOR("Qumranet");
  32 MODULE_LICENSE("GPL");
  33
  34 static DEFINE_PER_CPU(struct vmcs *, vmxarea);
  35 static DEFINE_PER_CPU(struct vmcs *, current_vmcs);
  36
  37 #ifdef CONFIG_X86_64
  38 #define HOST_IS_64 1
  39 #else
  40 #define HOST_IS_64 0
  41 #endif
  42
  43 static struct vmcs_descriptor {
  44         int size;
  45         int order;
  46         u32 revision_id;
  47 } vmcs_descriptor;
  48
  49 #define VMX_SEGMENT_FIELD(seg)                                  \
  50         [VCPU_SREG_##seg] = {                                   \
  51                 .selector = GUEST_##seg##_SELECTOR,             \
  52                 .base = GUEST_##seg##_BASE,                     \
  53                 .limit = GUEST_##seg##_LIMIT,                   \
  54                 .ar_bytes = GUEST_##seg##_AR_BYTES,             \
  55         }
  56
  57 static struct kvm_vmx_segment_field {
  58         unsigned selector;
  59         unsigned base;
  60         unsigned limit;
  61         unsigned ar_bytes;
  62 } kvm_vmx_segment_fields[] = {
  63         VMX_SEGMENT_FIELD(CS),
  64         VMX_SEGMENT_FIELD(DS),
  65         VMX_SEGMENT_FIELD(ES),
  66         VMX_SEGMENT_FIELD(FS),
  67         VMX_SEGMENT_FIELD(GS),
  68         VMX_SEGMENT_FIELD(SS),
  69         VMX_SEGMENT_FIELD(TR),
  70         VMX_SEGMENT_FIELD(LDTR),
  71 };
  72
  73 static const u32 vmx_msr_index[] = {
  74 #ifdef CONFIG_X86_64
  75         MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR, MSR_KERNEL_GS_BASE,
  76 #endif
  77         MSR_EFER, MSR_K6_STAR,
  78 };
  79 #define NR_VMX_MSR ARRAY_SIZE(vmx_msr_index)
  80
  81 static inline int is_page_fault(u32 intr_info)
  82 {
  83         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
  84                              INTR_INFO_VALID_MASK)) ==
  85                 (INTR_TYPE_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK);
  86 }
  87
  88 static inline int is_external_interrupt(u32 intr_info)
  89 {
  90         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
  91                 == (INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
  92 }
  93
  94 static struct vmx_msr_entry *find_msr_entry(struct kvm_vcpu *vcpu, u32 msr)
  95 {
  96         int i;
  97
  98         for (i = 0; i < vcpu->nmsrs; ++i)
  99                 if (vcpu->guest_msrs[i].index == msr)
 100                         return &vcpu->guest_msrs[i];
 101         return NULL;
 102 }
 103
 104 static void vmcs_clear(struct vmcs *vmcs)
 105 {
 106         u64 phys_addr = __pa(vmcs);
 107         u8 error;
 108
 109         asm volatile (ASM_VMX_VMCLEAR_RAX "; setna %0"
 110                       : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
 111                       : "cc", "memory");
 112         if (error)
 113                 printk(KERN_ERR "kvm: vmclear fail: %p/%llx\n",
 114                        vmcs, phys_addr);
 115 }
 116
 117 static void __vcpu_clear(void *arg)
 118 {
 119         struct kvm_vcpu *vcpu = arg;
 120         int cpu = raw_smp_processor_id();
 121
 122         if (vcpu->cpu == cpu)
 123                 vmcs_clear(vcpu->vmcs);
 124         if (per_cpu(current_vmcs, cpu) == vcpu->vmcs)
 125                 per_cpu(current_vmcs, cpu) = NULL;
 126 }
 127
 128 static void vcpu_clear(struct kvm_vcpu *vcpu)
 129 {
 130         if (vcpu->cpu != raw_smp_processor_id() && vcpu->cpu != -1)
 131                 smp_call_function_single(vcpu->cpu, __vcpu_clear, vcpu, 0, 1);
 132         else
 133                 __vcpu_clear(vcpu);
 134         vcpu->launched = 0;
 135 }
 136
 137 static unsigned long vmcs_readl(unsigned long field)
 138 {
 139         unsigned long value;
 140
 141         asm volatile (ASM_VMX_VMREAD_RDX_RAX
 142                       : "=a"(value) : "d"(field) : "cc");
 143         return value;
 144 }
 145
 146 static u16 vmcs_read16(unsigned long field)
 147 {
 148         return vmcs_readl(field);
 149 }
 150
 151 static u32 vmcs_read32(unsigned long field)
 152 {
 153         return vmcs_readl(field);
 154 }
 155
 156 static u64 vmcs_read64(unsigned long field)
 157 {
 158 #ifdef CONFIG_X86_64
 159         return vmcs_readl(field);
 160 #else
 161         return vmcs_readl(field) | ((u64)vmcs_readl(field+1) << 32);
 162 #endif
 163 }
 164
 165 static noinline void vmwrite_error(unsigned long field, unsigned long value)
 166 {
 167         printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n",
 168                field, value, vmcs_read32(VM_INSTRUCTION_ERROR));
 169         dump_stack();
 170 }
 171
 172 static void vmcs_writel(unsigned long field, unsigned long value)
 173 {
 174         u8 error;
 175
 176         asm volatile (ASM_VMX_VMWRITE_RAX_RDX "; setna %0"
 177                        : "=q"(error) : "a"(value), "d"(field) : "cc" );
 178         if (unlikely(error))
 179                 vmwrite_error(field, value);
 180 }
 181
 182 static void vmcs_write16(unsigned long field, u16 value)
 183 {
 184         vmcs_writel(field, value);
 185 }
 186
 187 static void vmcs_write32(unsigned long field, u32 value)
 188 {
 189         vmcs_writel(field, value);
 190 }
 191
 192 static void vmcs_write64(unsigned long field, u64 value)
 193 {
 194 #ifdef CONFIG_X86_64
 195         vmcs_writel(field, value);
 196 #else
 197         vmcs_writel(field, value);
 198         asm volatile ("");
 199         vmcs_writel(field+1, value >> 32);
 200 #endif
 201 }
 202
 203 /*
 204  * Switches to specified vcpu, until a matching vcpu_put(), but assumes
 205  * vcpu mutex is already taken.
 206  */
 207 static void vmx_vcpu_load(struct kvm_vcpu *vcpu)
 208 {
 209         u64 phys_addr = __pa(vcpu->vmcs);
 210         int cpu;
 211
 212         cpu = get_cpu();
 213
 214         if (vcpu->cpu != cpu)
 215                 vcpu_clear(vcpu);
 216
 217         if (per_cpu(current_vmcs, cpu) != vcpu->vmcs) {
 218                 u8 error;
 219
 220                 per_cpu(current_vmcs, cpu) = vcpu->vmcs;
 221                 asm volatile (ASM_VMX_VMPTRLD_RAX "; setna %0"
 222                               : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
 223                               : "cc");
 224                 if (error)
 225                         printk(KERN_ERR "kvm: vmptrld %p/%llx fail\n",
 226                                vcpu->vmcs, phys_addr);
 227         }
 228
 229         if (vcpu->cpu != cpu) {
 230                 struct descriptor_table dt;
 231                 unsigned long sysenter_esp;
 232
 233                 vcpu->cpu = cpu;
 234                 /*
 235                  * Linux uses per-cpu TSS and GDT, so set these when switching
 236                  * processors.
 237                  */
 238                 vmcs_writel(HOST_TR_BASE, read_tr_base()); /* 22.2.4 */
 239                 get_gdt(&dt);
 240                 vmcs_writel(HOST_GDTR_BASE, dt.base);   /* 22.2.4 */
 241
 242                 rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
 243                 vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */
 244         }
 245 }
 246
 247 static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
 248 {
 249         put_cpu();
 250 }
 251
 252 static void vmx_vcpu_decache(struct kvm_vcpu *vcpu)
 253 {
 254         vcpu_clear(vcpu);
 255 }
 256
 257 static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu)
 258 {
 259         return vmcs_readl(GUEST_RFLAGS);
 260 }
 261
 262 static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
 263 {
 264         vmcs_writel(GUEST_RFLAGS, rflags);
 265 }
 266
 267 static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
 268 {
 269         unsigned long rip;
 270         u32 interruptibility;
 271
 272         rip = vmcs_readl(GUEST_RIP);
 273         rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
 274         vmcs_writel(GUEST_RIP, rip);
 275
 276         /*
 277          * We emulated an instruction, so temporary interrupt blocking
 278          * should be removed, if set.
 279          */
 280         interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
 281         if (interruptibility & 3)
 282                 vmcs_write32(GUEST_INTERRUPTIBILITY_INFO,
 283                              interruptibility & ~3);
 284         vcpu->interrupt_window_open = 1;
 285 }
 286
 287 static void vmx_inject_gp(struct kvm_vcpu *vcpu, unsigned error_code)
 288 {
 289         printk(KERN_DEBUG "inject_general_protection: rip 0x%lx\n",
 290                vmcs_readl(GUEST_RIP));
 291         vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code);
 292         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
 293                      GP_VECTOR |
 294                      INTR_TYPE_EXCEPTION |
 295                      INTR_INFO_DELIEVER_CODE_MASK |
 296                      INTR_INFO_VALID_MASK);
 297 }
 298
 299 /*
 300  * reads and returns guest's timestamp counter "register"
 301  * guest_tsc = host_tsc + tsc_offset    -- 21.3
 302  */
 303 static u64 guest_read_tsc(void)
 304 {
 305         u64 host_tsc, tsc_offset;
 306
 307         rdtscll(host_tsc);
 308         tsc_offset = vmcs_read64(TSC_OFFSET);
 309         return host_tsc + tsc_offset;
 310 }
 311
 312 /*
 313  * writes 'guest_tsc' into guest's timestamp counter "register"
 314  * guest_tsc = host_tsc + tsc_offset ==> tsc_offset = guest_tsc - host_tsc
 315  */
 316 static void guest_write_tsc(u64 guest_tsc)
 317 {
 318         u64 host_tsc;
 319
 320         rdtscll(host_tsc);
 321         vmcs_write64(TSC_OFFSET, guest_tsc - host_tsc);
 322 }
 323
 324 static void reload_tss(void)
 325 {
 326 #ifndef CONFIG_X86_64
 327
 328         /*
 329          * VT restores TR but not its size.  Useless.
 330          */
 331         struct descriptor_table gdt;
 332         struct segment_descriptor *descs;
 333
 334         get_gdt(&gdt);
 335         descs = (void *)gdt.base;
 336         descs[GDT_ENTRY_TSS].type = 9; /* available TSS */
 337         load_TR_desc();
 338 #endif
 339 }
 340
 341 /*
 342  * Reads an msr value (of 'msr_index') into 'pdata'.
 343  * Returns 0 on success, non-0 otherwise.
 344  * Assumes vcpu_load() was already called.
 345  */
 346 static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
 347 {
 348         u64 data;
 349         struct vmx_msr_entry *msr;
 350
 351         if (!pdata) {
 352                 printk(KERN_ERR "BUG: get_msr called with NULL pdata\n");
 353                 return -EINVAL;
 354         }
 355
 356         switch (msr_index) {
 357 #ifdef CONFIG_X86_64
 358         case MSR_FS_BASE:
 359                 data = vmcs_readl(GUEST_FS_BASE);
 360                 break;
 361         case MSR_GS_BASE:
 362                 data = vmcs_readl(GUEST_GS_BASE);
 363                 break;
 364         case MSR_EFER:
 365                 return kvm_get_msr_common(vcpu, msr_index, pdata);
 366 #endif
 367         case MSR_IA32_TIME_STAMP_COUNTER:
 368                 data = guest_read_tsc();
 369                 break;
 370         case MSR_IA32_SYSENTER_CS:
 371                 data = vmcs_read32(GUEST_SYSENTER_CS);
 372                 break;
 373         case MSR_IA32_SYSENTER_EIP:
 374                 data = vmcs_readl(GUEST_SYSENTER_EIP);
 375                 break;
 376         case MSR_IA32_SYSENTER_ESP:
 377                 data = vmcs_readl(GUEST_SYSENTER_ESP);
 378                 break;
 379         default:
 380                 msr = find_msr_entry(vcpu, msr_index);
 381                 if (msr) {
 382                         data = msr->data;
 383                         break;
 384                 }
 385                 return kvm_get_msr_common(vcpu, msr_index, pdata);
 386         }
 387
 388         *pdata = data;
 389         return 0;
 390 }
 391
 392 /*
 393  * Writes msr value into into the appropriate "register".
 394  * Returns 0 on success, non-0 otherwise.
 395  * Assumes vcpu_load() was already called.
 396  */
 397 static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
 398 {
 399         struct vmx_msr_entry *msr;
 400         switch (msr_index) {
 401 #ifdef CONFIG_X86_64
 402         case MSR_EFER:
 403                 return kvm_set_msr_common(vcpu, msr_index, data);
 404         case MSR_FS_BASE:
 405                 vmcs_writel(GUEST_FS_BASE, data);
 406                 break;
 407         case MSR_GS_BASE:
 408                 vmcs_writel(GUEST_GS_BASE, data);
 409                 break;
 410 #endif
 411         case MSR_IA32_SYSENTER_CS:
 412                 vmcs_write32(GUEST_SYSENTER_CS, data);
 413                 break;
 414         case MSR_IA32_SYSENTER_EIP:
 415                 vmcs_writel(GUEST_SYSENTER_EIP, data);
 416                 break;
 417         case MSR_IA32_SYSENTER_ESP:
 418                 vmcs_writel(GUEST_SYSENTER_ESP, data);
 419                 break;
 420         case MSR_IA32_TIME_STAMP_COUNTER:
 421                 guest_write_tsc(data);
 422                 break;
 423         default:
 424                 msr = find_msr_entry(vcpu, msr_index);
 425                 if (msr) {
 426                         msr->data = data;
 427                         break;
 428                 }
 429                 return kvm_set_msr_common(vcpu, msr_index, data);
 430                 msr->data = data;
 431                 break;
 432         }
 433
 434         return 0;
 435 }
 436
 437 /*
 438  * Sync the rsp and rip registers into the vcpu structure.  This allows
 439  * registers to be accessed by indexing vcpu->regs.
 440  */
 441 static void vcpu_load_rsp_rip(struct kvm_vcpu *vcpu)
 442 {
 443         vcpu->regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP);
 444         vcpu->rip = vmcs_readl(GUEST_RIP);
 445 }
 446
 447 /*
 448  * Syncs rsp and rip back into the vmcs.  Should be called after possible
 449  * modification.
 450  */
 451 static void vcpu_put_rsp_rip(struct kvm_vcpu *vcpu)
 452 {
 453         vmcs_writel(GUEST_RSP, vcpu->regs[VCPU_REGS_RSP]);
 454         vmcs_writel(GUEST_RIP, vcpu->rip);
 455 }
 456
 457 static int set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_debug_guest *dbg)
 458 {
 459         unsigned long dr7 = 0x400;
 460         u32 exception_bitmap;
 461         int old_singlestep;
 462
 463         exception_bitmap = vmcs_read32(EXCEPTION_BITMAP);
 464         old_singlestep = vcpu->guest_debug.singlestep;
 465
 466         vcpu->guest_debug.enabled = dbg->enabled;
 467         if (vcpu->guest_debug.enabled) {
 468                 int i;
 469
 470                 dr7 |= 0x200;  /* exact */
 471                 for (i = 0; i < 4; ++i) {
 472                         if (!dbg->breakpoints[i].enabled)
 473                                 continue;
 474                         vcpu->guest_debug.bp[i] = dbg->breakpoints[i].address;
 475                         dr7 |= 2 << (i*2);    /* global enable */
 476                         dr7 |= 0 << (i*4+16); /* execution breakpoint */
 477                 }
 478
 479                 exception_bitmap |= (1u << 1);  /* Trap debug exceptions */
 480
 481                 vcpu->guest_debug.singlestep = dbg->singlestep;
 482         } else {
 483                 exception_bitmap &= ~(1u << 1); /* Ignore debug exceptions */
 484                 vcpu->guest_debug.singlestep = 0;
 485         }
 486
 487         if (old_singlestep && !vcpu->guest_debug.singlestep) {
 488                 unsigned long flags;
 489
 490                 flags = vmcs_readl(GUEST_RFLAGS);
 491                 flags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
 492                 vmcs_writel(GUEST_RFLAGS, flags);
 493         }
 494
 495         vmcs_write32(EXCEPTION_BITMAP, exception_bitmap);
 496         vmcs_writel(GUEST_DR7, dr7);
 497
 498         return 0;
 499 }
 500
 501 static __init int cpu_has_kvm_support(void)
 502 {
 503         unsigned long ecx = cpuid_ecx(1);
 504         return test_bit(5, &ecx); /* CPUID.1:ECX.VMX[bit 5] -> VT */
 505 }
 506
 507 static __init int vmx_disabled_by_bios(void)
 508 {
 509         u64 msr;
 510
 511         rdmsrl(MSR_IA32_FEATURE_CONTROL, msr);
 512         return (msr & 5) == 1; /* locked but not enabled */
 513 }
 514
 515 static void hardware_enable(void *garbage)
 516 {
 517         int cpu = raw_smp_processor_id();
 518         u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
 519         u64 old;
 520
 521         rdmsrl(MSR_IA32_FEATURE_CONTROL, old);
 522         if ((old & 5) != 5)
 523                 /* enable and lock */
 524                 wrmsrl(MSR_IA32_FEATURE_CONTROL, old | 5);
 525         write_cr4(read_cr4() | CR4_VMXE); /* FIXME: not cpu hotplug safe */
 526         asm volatile (ASM_VMX_VMXON_RAX : : "a"(&phys_addr), "m"(phys_addr)
 527                       : "memory", "cc");
 528 }
 529
 530 static void hardware_disable(void *garbage)
 531 {
 532         asm volatile (ASM_VMX_VMXOFF : : : "cc");
 533 }
 534
 535 static __init void setup_vmcs_descriptor(void)
 536 {
 537         u32 vmx_msr_low, vmx_msr_high;
 538
 539         rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high);
 540         vmcs_descriptor.size = vmx_msr_high & 0x1fff;
 541         vmcs_descriptor.order = get_order(vmcs_descriptor.size);
 542         vmcs_descriptor.revision_id = vmx_msr_low;
 543 }
 544
 545 static struct vmcs *alloc_vmcs_cpu(int cpu)
 546 {
 547         int node = cpu_to_node(cpu);
 548         struct page *pages;
 549         struct vmcs *vmcs;
 550
 551         pages = alloc_pages_node(node, GFP_KERNEL, vmcs_descriptor.order);
 552         if (!pages)
 553                 return NULL;
 554         vmcs = page_address(pages);
 555         memset(vmcs, 0, vmcs_descriptor.size);
 556         vmcs->revision_id = vmcs_descriptor.revision_id; /* vmcs revision id */
 557         return vmcs;
 558 }
 559
 560 static struct vmcs *alloc_vmcs(void)
 561 {
 562         return alloc_vmcs_cpu(raw_smp_processor_id());
 563 }
 564
 565 static void free_vmcs(struct vmcs *vmcs)
 566 {
 567         free_pages((unsigned long)vmcs, vmcs_descriptor.order);
 568 }
 569
 570 static __exit void free_kvm_area(void)
 571 {
 572         int cpu;
 573
 574         for_each_online_cpu(cpu)
 575                 free_vmcs(per_cpu(vmxarea, cpu));
 576 }
 577
 578 extern struct vmcs *alloc_vmcs_cpu(int cpu);
 579
 580 static __init int alloc_kvm_area(void)
 581 {
 582         int cpu;
 583
 584         for_each_online_cpu(cpu) {
 585                 struct vmcs *vmcs;
 586
 587                 vmcs = alloc_vmcs_cpu(cpu);
 588                 if (!vmcs) {
 589                         free_kvm_area();
 590                         return -ENOMEM;
 591                 }
 592
 593                 per_cpu(vmxarea, cpu) = vmcs;
 594         }
 595         return 0;
 596 }
 597
 598 static __init int hardware_setup(void)
 599 {
 600         setup_vmcs_descriptor();
 601         return alloc_kvm_area();
 602 }
 603
 604 static __exit void hardware_unsetup(void)
 605 {
 606         free_kvm_area();
 607 }
 608
 609 static void update_exception_bitmap(struct kvm_vcpu *vcpu)
 610 {
 611         if (vcpu->rmode.active)
 612                 vmcs_write32(EXCEPTION_BITMAP, ~0);
 613         else
 614                 vmcs_write32(EXCEPTION_BITMAP, 1 << PF_VECTOR);
 615 }
 616
 617 static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save)
 618 {
 619         struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
 620
 621         if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) {
 622                 vmcs_write16(sf->selector, save->selector);
 623                 vmcs_writel(sf->base, save->base);
 624                 vmcs_write32(sf->limit, save->limit);
 625                 vmcs_write32(sf->ar_bytes, save->ar);
 626         } else {
 627                 u32 dpl = (vmcs_read16(sf->selector) & SELECTOR_RPL_MASK)
 628                         << AR_DPL_SHIFT;
 629                 vmcs_write32(sf->ar_bytes, 0x93 | dpl);
 630         }
 631 }
 632
 633 static void enter_pmode(struct kvm_vcpu *vcpu)
 634 {
 635         unsigned long flags;
 636
 637         vcpu->rmode.active = 0;
 638
 639         vmcs_writel(GUEST_TR_BASE, vcpu->rmode.tr.base);
 640         vmcs_write32(GUEST_TR_LIMIT, vcpu->rmode.tr.limit);
 641         vmcs_write32(GUEST_TR_AR_BYTES, vcpu->rmode.tr.ar);
 642
 643         flags = vmcs_readl(GUEST_RFLAGS);
 644         flags &= ~(IOPL_MASK | X86_EFLAGS_VM);
 645         flags |= (vcpu->rmode.save_iopl << IOPL_SHIFT);
 646         vmcs_writel(GUEST_RFLAGS, flags);
 647
 648         vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~CR4_VME_MASK) |
 649                         (vmcs_readl(CR4_READ_SHADOW) & CR4_VME_MASK));
 650
 651         update_exception_bitmap(vcpu);
 652
 653         fix_pmode_dataseg(VCPU_SREG_ES, &vcpu->rmode.es);
 654         fix_pmode_dataseg(VCPU_SREG_DS, &vcpu->rmode.ds);
 655         fix_pmode_dataseg(VCPU_SREG_GS, &vcpu->rmode.gs);
 656         fix_pmode_dataseg(VCPU_SREG_FS, &vcpu->rmode.fs);
 657
 658         vmcs_write16(GUEST_SS_SELECTOR, 0);
 659         vmcs_write32(GUEST_SS_AR_BYTES, 0x93);
 660
 661         vmcs_write16(GUEST_CS_SELECTOR,
 662                      vmcs_read16(GUEST_CS_SELECTOR) & ~SELECTOR_RPL_MASK);
 663         vmcs_write32(GUEST_CS_AR_BYTES, 0x9b);
 664 }
 665
 666 static int rmode_tss_base(struct kvm* kvm)
 667 {
 668         gfn_t base_gfn = kvm->memslots[0].base_gfn + kvm->memslots[0].npages - 3;
 669         return base_gfn << PAGE_SHIFT;
 670 }
 671
 672 static void fix_rmode_seg(int seg, struct kvm_save_segment *save)
 673 {
 674         struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
 675
 676         save->selector = vmcs_read16(sf->selector);
 677         save->base = vmcs_readl(sf->base);
 678         save->limit = vmcs_read32(sf->limit);
 679         save->ar = vmcs_read32(sf->ar_bytes);
 680         vmcs_write16(sf->selector, vmcs_readl(sf->base) >> 4);
 681         vmcs_write32(sf->limit, 0xffff);
 682         vmcs_write32(sf->ar_bytes, 0xf3);
 683 }
 684
 685 static void enter_rmode(struct kvm_vcpu *vcpu)
 686 {
 687         unsigned long flags;
 688
 689         vcpu->rmode.active = 1;
 690
 691         vcpu->rmode.tr.base = vmcs_readl(GUEST_TR_BASE);
 692         vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm));
 693
 694         vcpu->rmode.tr.limit = vmcs_read32(GUEST_TR_LIMIT);
 695         vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1);
 696
 697         vcpu->rmode.tr.ar = vmcs_read32(GUEST_TR_AR_BYTES);
 698         vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
 699
 700         flags = vmcs_readl(GUEST_RFLAGS);
 701         vcpu->rmode.save_iopl = (flags & IOPL_MASK) >> IOPL_SHIFT;
 702
 703         flags |= IOPL_MASK | X86_EFLAGS_VM;
 704
 705         vmcs_writel(GUEST_RFLAGS, flags);
 706         vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | CR4_VME_MASK);
 707         update_exception_bitmap(vcpu);
 708
 709         vmcs_write16(GUEST_SS_SELECTOR, vmcs_readl(GUEST_SS_BASE) >> 4);
 710         vmcs_write32(GUEST_SS_LIMIT, 0xffff);
 711         vmcs_write32(GUEST_SS_AR_BYTES, 0xf3);
 712
 713         vmcs_write32(GUEST_CS_AR_BYTES, 0xf3);
 714         vmcs_write32(GUEST_CS_LIMIT, 0xffff);
 715         vmcs_write16(GUEST_CS_SELECTOR, vmcs_readl(GUEST_CS_BASE) >> 4);
 716
 717         fix_rmode_seg(VCPU_SREG_ES, &vcpu->rmode.es);
 718         fix_rmode_seg(VCPU_SREG_DS, &vcpu->rmode.ds);
 719         fix_rmode_seg(VCPU_SREG_GS, &vcpu->rmode.gs);
 720         fix_rmode_seg(VCPU_SREG_FS, &vcpu->rmode.fs);
 721 }
 722
 723 #ifdef CONFIG_X86_64
 724
 725 static void enter_lmode(struct kvm_vcpu *vcpu)
 726 {
 727         u32 guest_tr_ar;
 728
 729         guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES);
 730         if ((guest_tr_ar & AR_TYPE_MASK) != AR_TYPE_BUSY_64_TSS) {
 731                 printk(KERN_DEBUG "%s: tss fixup for long mode. \n",
 732                        __FUNCTION__);
 733                 vmcs_write32(GUEST_TR_AR_BYTES,
 734                              (guest_tr_ar & ~AR_TYPE_MASK)
 735                              | AR_TYPE_BUSY_64_TSS);
 736         }
 737
 738         vcpu->shadow_efer |= EFER_LMA;
 739
 740         find_msr_entry(vcpu, MSR_EFER)->data |= EFER_LMA | EFER_LME;
 741         vmcs_write32(VM_ENTRY_CONTROLS,
 742                      vmcs_read32(VM_ENTRY_CONTROLS)
 743                      | VM_ENTRY_CONTROLS_IA32E_MASK);
 744 }
 745
 746 static void exit_lmode(struct kvm_vcpu *vcpu)
 747 {
 748         vcpu->shadow_efer &= ~EFER_LMA;
 749
 750         vmcs_write32(VM_ENTRY_CONTROLS,
 751                      vmcs_read32(VM_ENTRY_CONTROLS)
 752                      & ~VM_ENTRY_CONTROLS_IA32E_MASK);
 753 }
 754
 755 #endif
 756
 757 static void vmx_decache_cr0_cr4_guest_bits(struct kvm_vcpu *vcpu)
 758 {
 759         vcpu->cr0 &= KVM_GUEST_CR0_MASK;
 760         vcpu->cr0 |= vmcs_readl(GUEST_CR0) & ~KVM_GUEST_CR0_MASK;
 761
 762         vcpu->cr4 &= KVM_GUEST_CR4_MASK;
 763         vcpu->cr4 |= vmcs_readl(GUEST_CR4) & ~KVM_GUEST_CR4_MASK;
 764 }
 765
 766 static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 767 {
 768         if (vcpu->rmode.active && (cr0 & CR0_PE_MASK))
 769                 enter_pmode(vcpu);
 770
 771         if (!vcpu->rmode.active && !(cr0 & CR0_PE_MASK))
 772                 enter_rmode(vcpu);
 773
 774 #ifdef CONFIG_X86_64
 775         if (vcpu->shadow_efer & EFER_LME) {
 776                 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK))
 777                         enter_lmode(vcpu);
 778                 if (is_paging(vcpu) && !(cr0 & CR0_PG_MASK))
 779                         exit_lmode(vcpu);
 780         }
 781 #endif
 782
 783         vmcs_writel(CR0_READ_SHADOW, cr0);
 784         vmcs_writel(GUEST_CR0,
 785                     (cr0 & ~KVM_GUEST_CR0_MASK) | KVM_VM_CR0_ALWAYS_ON);
 786         vcpu->cr0 = cr0;
 787 }
 788
 789 /*
 790  * Used when restoring the VM to avoid corrupting segment registers
 791  */
 792 static void vmx_set_cr0_no_modeswitch(struct kvm_vcpu *vcpu, unsigned long cr0)
 793 {
 794         if (!vcpu->rmode.active && !(cr0 & CR0_PE_MASK))
 795                 enter_rmode(vcpu);
 796
 797         vcpu->rmode.active = ((cr0 & CR0_PE_MASK) == 0);
 798         update_exception_bitmap(vcpu);
 799         vmcs_writel(CR0_READ_SHADOW, cr0);
 800         vmcs_writel(GUEST_CR0,
 801                     (cr0 & ~KVM_GUEST_CR0_MASK) | KVM_VM_CR0_ALWAYS_ON);
 802         vcpu->cr0 = cr0;
 803 }
 804
 805 static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
 806 {
 807         vmcs_writel(GUEST_CR3, cr3);
 808 }
 809
 810 static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
 811 {
 812         vmcs_writel(CR4_READ_SHADOW, cr4);
 813         vmcs_writel(GUEST_CR4, cr4 | (vcpu->rmode.active ?
 814                     KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON));
 815         vcpu->cr4 = cr4;
 816 }
 817
 818 #ifdef CONFIG_X86_64
 819
 820 static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer)
 821 {
 822         struct vmx_msr_entry *msr = find_msr_entry(vcpu, MSR_EFER);
 823
 824         vcpu->shadow_efer = efer;
 825         if (efer & EFER_LMA) {
 826                 vmcs_write32(VM_ENTRY_CONTROLS,
 827                                      vmcs_read32(VM_ENTRY_CONTROLS) |
 828                                      VM_ENTRY_CONTROLS_IA32E_MASK);
 829                 msr->data = efer;
 830
 831         } else {
 832                 vmcs_write32(VM_ENTRY_CONTROLS,
 833                                      vmcs_read32(VM_ENTRY_CONTROLS) &
 834                                      ~VM_ENTRY_CONTROLS_IA32E_MASK);
 835
 836                 msr->data = efer & ~EFER_LME;
 837         }
 838 }
 839
 840 #endif
 841
 842 static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg)
 843 {
 844         struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
 845
 846         return vmcs_readl(sf->base);
 847 }
 848
 849 static void vmx_get_segment(struct kvm_vcpu *vcpu,
 850                             struct kvm_segment *var, int seg)
 851 {
 852         struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
 853         u32 ar;
 854
 855         var->base = vmcs_readl(sf->base);
 856         var->limit = vmcs_read32(sf->limit);
 857         var->selector = vmcs_read16(sf->selector);
 858         ar = vmcs_read32(sf->ar_bytes);
 859         if (ar & AR_UNUSABLE_MASK)
 860                 ar = 0;
 861         var->type = ar & 15;
 862         var->s = (ar >> 4) & 1;
 863         var->dpl = (ar >> 5) & 3;
 864         var->present = (ar >> 7) & 1;
 865         var->avl = (ar >> 12) & 1;
 866         var->l = (ar >> 13) & 1;
 867         var->db = (ar >> 14) & 1;
 868         var->g = (ar >> 15) & 1;
 869         var->unusable = (ar >> 16) & 1;
 870 }
 871
 872 static void vmx_set_segment(struct kvm_vcpu *vcpu,
 873                             struct kvm_segment *var, int seg)
 874 {
 875         struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
 876         u32 ar;
 877
 878         vmcs_writel(sf->base, var->base);
 879         vmcs_write32(sf->limit, var->limit);
 880         vmcs_write16(sf->selector, var->selector);
 881         if (var->unusable)
 882                 ar = 1 << 16;
 883         else {
 884                 ar = var->type & 15;
 885                 ar |= (var->s & 1) << 4;
 886                 ar |= (var->dpl & 3) << 5;
 887                 ar |= (var->present & 1) << 7;
 888                 ar |= (var->avl & 1) << 12;
 889                 ar |= (var->l & 1) << 13;
 890                 ar |= (var->db & 1) << 14;
 891                 ar |= (var->g & 1) << 15;
 892         }
 893         if (ar == 0) /* a 0 value means unusable */
 894                 ar = AR_UNUSABLE_MASK;
 895         vmcs_write32(sf->ar_bytes, ar);
 896 }
 897
 898 static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
 899 {
 900         u32 ar = vmcs_read32(GUEST_CS_AR_BYTES);
 901
 902         *db = (ar >> 14) & 1;
 903         *l = (ar >> 13) & 1;
 904 }
 905
 906 static void vmx_get_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
 907 {
 908         dt->limit = vmcs_read32(GUEST_IDTR_LIMIT);
 909         dt->base = vmcs_readl(GUEST_IDTR_BASE);
 910 }
 911
 912 static void vmx_set_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
 913 {
 914         vmcs_write32(GUEST_IDTR_LIMIT, dt->limit);
 915         vmcs_writel(GUEST_IDTR_BASE, dt->base);
 916 }
 917
 918 static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
 919 {
 920         dt->limit = vmcs_read32(GUEST_GDTR_LIMIT);
 921         dt->base = vmcs_readl(GUEST_GDTR_BASE);
 922 }
 923
 924 static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
 925 {
 926         vmcs_write32(GUEST_GDTR_LIMIT, dt->limit);
 927         vmcs_writel(GUEST_GDTR_BASE, dt->base);
 928 }
 929
 930 static int init_rmode_tss(struct kvm* kvm)
 931 {
 932         struct page *p1, *p2, *p3;
 933         gfn_t fn = rmode_tss_base(kvm) >> PAGE_SHIFT;
 934         char *page;
 935
 936         p1 = _gfn_to_page(kvm, fn++);
 937         p2 = _gfn_to_page(kvm, fn++);
 938         p3 = _gfn_to_page(kvm, fn);
 939
 940         if (!p1 || !p2 || !p3) {
 941                 kvm_printf(kvm,"%s: gfn_to_page failed\n", __FUNCTION__);
 942                 return 0;
 943         }
 944
 945         page = kmap_atomic(p1, KM_USER0);
 946         memset(page, 0, PAGE_SIZE);
 947         *(u16*)(page + 0x66) = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE;
 948         kunmap_atomic(page, KM_USER0);
 949
 950         page = kmap_atomic(p2, KM_USER0);
 951         memset(page, 0, PAGE_SIZE);
 952         kunmap_atomic(page, KM_USER0);
 953
 954         page = kmap_atomic(p3, KM_USER0);
 955         memset(page, 0, PAGE_SIZE);
 956         *(page + RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1) = ~0;
 957         kunmap_atomic(page, KM_USER0);
 958
 959         return 1;
 960 }
 961
 962 static void vmcs_write32_fixedbits(u32 msr, u32 vmcs_field, u32 val)
 963 {
 964         u32 msr_high, msr_low;
 965
 966         rdmsr(msr, msr_low, msr_high);
 967
 968         val &= msr_high;
 969         val |= msr_low;
 970         vmcs_write32(vmcs_field, val);
 971 }
 972
 973 static void seg_setup(int seg)
 974 {
 975         struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
 976
 977         vmcs_write16(sf->selector, 0);
 978         vmcs_writel(sf->base, 0);
 979         vmcs_write32(sf->limit, 0xffff);
 980         vmcs_write32(sf->ar_bytes, 0x93);
 981 }
 982
 983 /*
 984  * Sets up the vmcs for emulated real mode.
 985  */
 986 static int vmx_vcpu_setup(struct kvm_vcpu *vcpu)
 987 {
 988         u32 host_sysenter_cs;
 989         u32 junk;
 990         unsigned long a;
 991         struct descriptor_table dt;
 992         int i;
 993         int ret = 0;
 994         int nr_good_msrs;
 995         extern asmlinkage void kvm_vmx_return(void);
 996
 997         if (!init_rmode_tss(vcpu->kvm)) {
 998                 ret = -ENOMEM;
 999                 goto out;
1000         }
1001
1002         memset(vcpu->regs, 0, sizeof(vcpu->regs));
1003         vcpu->regs[VCPU_REGS_RDX] = get_rdx_init_val();
1004         vcpu->cr8 = 0;
1005         vcpu->apic_base = 0xfee00000 |
1006                         /*for vcpu 0*/ MSR_IA32_APICBASE_BSP |
1007                         MSR_IA32_APICBASE_ENABLE;
1008
1009         fx_init(vcpu);
1010
1011         /*
1012          * GUEST_CS_BASE should really be 0xffff0000, but VT vm86 mode
1013          * insists on having GUEST_CS_BASE == GUEST_CS_SELECTOR << 4.  Sigh.
1014          */
1015         vmcs_write16(GUEST_CS_SELECTOR, 0xf000);
1016         vmcs_writel(GUEST_CS_BASE, 0x000f0000);
1017         vmcs_write32(GUEST_CS_LIMIT, 0xffff);
1018         vmcs_write32(GUEST_CS_AR_BYTES, 0x9b);
1019
1020         seg_setup(VCPU_SREG_DS);
1021         seg_setup(VCPU_SREG_ES);
1022         seg_setup(VCPU_SREG_FS);
1023         seg_setup(VCPU_SREG_GS);
1024         seg_setup(VCPU_SREG_SS);
1025
1026         vmcs_write16(GUEST_TR_SELECTOR, 0);
1027         vmcs_writel(GUEST_TR_BASE, 0);
1028         vmcs_write32(GUEST_TR_LIMIT, 0xffff);
1029         vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
1030
1031         vmcs_write16(GUEST_LDTR_SELECTOR, 0);
1032         vmcs_writel(GUEST_LDTR_BASE, 0);
1033         vmcs_write32(GUEST_LDTR_LIMIT, 0xffff);
1034         vmcs_write32(GUEST_LDTR_AR_BYTES, 0x00082);
1035
1036         vmcs_write32(GUEST_SYSENTER_CS, 0);
1037         vmcs_writel(GUEST_SYSENTER_ESP, 0);
1038         vmcs_writel(GUEST_SYSENTER_EIP, 0);
1039
1040         vmcs_writel(GUEST_RFLAGS, 0x02);
1041         vmcs_writel(GUEST_RIP, 0xfff0);
1042         vmcs_writel(GUEST_RSP, 0);
1043
1044         //todo: dr0 = dr1 = dr2 = dr3 = 0; dr6 = 0xffff0ff0
1045         vmcs_writel(GUEST_DR7, 0x400);
1046
1047         vmcs_writel(GUEST_GDTR_BASE, 0);
1048         vmcs_write32(GUEST_GDTR_LIMIT, 0xffff);
1049
1050         vmcs_writel(GUEST_IDTR_BASE, 0);
1051         vmcs_write32(GUEST_IDTR_LIMIT, 0xffff);
1052
1053         vmcs_write32(GUEST_ACTIVITY_STATE, 0);
1054         vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, 0);
1055         vmcs_write32(GUEST_PENDING_DBG_EXCEPTIONS, 0);
1056
1057         /* I/O */
1058         vmcs_write64(IO_BITMAP_A, 0);
1059         vmcs_write64(IO_BITMAP_B, 0);
1060
1061         guest_write_tsc(0);
1062
1063         vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */
1064
1065         /* Special registers */
1066         vmcs_write64(GUEST_IA32_DEBUGCTL, 0);
1067
1068         /* Control */
1069         vmcs_write32_fixedbits(MSR_IA32_VMX_PINBASED_CTLS,
1070                                PIN_BASED_VM_EXEC_CONTROL,
1071                                PIN_BASED_EXT_INTR_MASK   /* 20.6.1 */
1072                                | PIN_BASED_NMI_EXITING   /* 20.6.1 */
1073                         );
1074         vmcs_write32_fixedbits(MSR_IA32_VMX_PROCBASED_CTLS,
1075                                CPU_BASED_VM_EXEC_CONTROL,
1076                                CPU_BASED_HLT_EXITING         /* 20.6.2 */
1077                                | CPU_BASED_CR8_LOAD_EXITING    /* 20.6.2 */
1078                                | CPU_BASED_CR8_STORE_EXITING   /* 20.6.2 */
1079                                | CPU_BASED_UNCOND_IO_EXITING   /* 20.6.2 */
1080                                | CPU_BASED_MOV_DR_EXITING
1081                                | CPU_BASED_USE_TSC_OFFSETING   /* 21.3 */
1082                         );
1083
1084         vmcs_write32(EXCEPTION_BITMAP, 1 << PF_VECTOR);
1085         vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, 0);
1086         vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, 0);
1087         vmcs_write32(CR3_TARGET_COUNT, 0);           /* 22.2.1 */
1088
1089         vmcs_writel(HOST_CR0, read_cr0());  /* 22.2.3 */
1090         vmcs_writel(HOST_CR4, read_cr4());  /* 22.2.3, 22.2.5 */
1091         vmcs_writel(HOST_CR3, read_cr3());  /* 22.2.3  FIXME: shadow tables */
1092
1093         vmcs_write16(HOST_CS_SELECTOR, __KERNEL_CS);  /* 22.2.4 */
1094         vmcs_write16(HOST_DS_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
1095         vmcs_write16(HOST_ES_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
1096         vmcs_write16(HOST_FS_SELECTOR, read_fs());    /* 22.2.4 */
1097         vmcs_write16(HOST_GS_SELECTOR, read_gs());    /* 22.2.4 */
1098         vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
1099 #ifdef CONFIG_X86_64
1100         rdmsrl(MSR_FS_BASE, a);
1101         vmcs_writel(HOST_FS_BASE, a); /* 22.2.4 */
1102         rdmsrl(MSR_GS_BASE, a);
1103         vmcs_writel(HOST_GS_BASE, a); /* 22.2.4 */
1104 #else
1105         vmcs_writel(HOST_FS_BASE, 0); /* 22.2.4 */
1106         vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */
1107 #endif
1108
1109         vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8);  /* 22.2.4 */
1110
1111         get_idt(&dt);
1112         vmcs_writel(HOST_IDTR_BASE, dt.base);   /* 22.2.4 */
1113
1114
1115         vmcs_writel(HOST_RIP, (unsigned long)kvm_vmx_return); /* 22.2.5 */
1116
1117         rdmsr(MSR_IA32_SYSENTER_CS, host_sysenter_cs, junk);
1118         vmcs_write32(HOST_IA32_SYSENTER_CS, host_sysenter_cs);
1119         rdmsrl(MSR_IA32_SYSENTER_ESP, a);
1120         vmcs_writel(HOST_IA32_SYSENTER_ESP, a);   /* 22.2.3 */
1121         rdmsrl(MSR_IA32_SYSENTER_EIP, a);
1122         vmcs_writel(HOST_IA32_SYSENTER_EIP, a);   /* 22.2.3 */
1123
1124         for (i = 0; i < NR_VMX_MSR; ++i) {
1125                 u32 index = vmx_msr_index[i];
1126                 u32 data_low, data_high;
1127                 u64 data;
1128                 int j = vcpu->nmsrs;
1129
1130                 if (rdmsr_safe(index, &data_low, &data_high) < 0)
1131                         continue;
1132                 if (wrmsr_safe(index, data_low, data_high) < 0)
1133                         continue;
1134                 data = data_low | ((u64)data_high << 32);
1135                 vcpu->host_msrs[j].index = index;
1136                 vcpu->host_msrs[j].reserved = 0;
1137                 vcpu->host_msrs[j].data = data;
1138                 vcpu->guest_msrs[j] = vcpu->host_msrs[j];
1139                 ++vcpu->nmsrs;
1140         }
1141         printk(KERN_DEBUG "kvm: msrs: %d\n", vcpu->nmsrs);
1142
1143         nr_good_msrs = vcpu->nmsrs - NR_BAD_MSRS;
1144         vmcs_writel(VM_ENTRY_MSR_LOAD_ADDR,
1145                     virt_to_phys(vcpu->guest_msrs + NR_BAD_MSRS));
1146         vmcs_writel(VM_EXIT_MSR_STORE_ADDR,
1147                     virt_to_phys(vcpu->guest_msrs + NR_BAD_MSRS));
1148         vmcs_writel(VM_EXIT_MSR_LOAD_ADDR,
1149                     virt_to_phys(vcpu->host_msrs + NR_BAD_MSRS));
1150         vmcs_write32_fixedbits(MSR_IA32_VMX_EXIT_CTLS, VM_EXIT_CONTROLS,
1151                                (HOST_IS_64 << 9));  /* 22.2,1, 20.7.1 */
1152         vmcs_write32(VM_EXIT_MSR_STORE_COUNT, nr_good_msrs); /* 22.2.2 */
1153         vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, nr_good_msrs);  /* 22.2.2 */
1154         vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, nr_good_msrs); /* 22.2.2 */
1155
1156
1157         /* 22.2.1, 20.8.1 */
1158         vmcs_write32_fixedbits(MSR_IA32_VMX_ENTRY_CTLS,
1159                                VM_ENTRY_CONTROLS, 0);
1160         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0);  /* 22.2.1 */
1161
1162 #ifdef CONFIG_X86_64
1163         vmcs_writel(VIRTUAL_APIC_PAGE_ADDR, 0);
1164         vmcs_writel(TPR_THRESHOLD, 0);
1165 #endif
1166
1167         vmcs_writel(CR0_GUEST_HOST_MASK, KVM_GUEST_CR0_MASK);
1168         vmcs_writel(CR4_GUEST_HOST_MASK, KVM_GUEST_CR4_MASK);
1169
1170         vcpu->cr0 = 0x60000010;
1171         vmx_set_cr0(vcpu, vcpu->cr0); // enter rmode
1172         vmx_set_cr4(vcpu, 0);
1173 #ifdef CONFIG_X86_64
1174         vmx_set_efer(vcpu, 0);
1175 #endif
1176
1177         return 0;
1178
1179 out:
1180         return ret;
1181 }
1182
1183 static void inject_rmode_irq(struct kvm_vcpu *vcpu, int irq)
1184 {
1185         u16 ent[2];
1186         u16 cs;
1187         u16 ip;
1188         unsigned long flags;
1189         unsigned long ss_base = vmcs_readl(GUEST_SS_BASE);
1190         u16 sp =  vmcs_readl(GUEST_RSP);
1191         u32 ss_limit = vmcs_read32(GUEST_SS_LIMIT);
1192
1193         if (sp > ss_limit || sp - 6 > sp) {
1194                 vcpu_printf(vcpu, "%s: #SS, rsp 0x%lx ss 0x%lx limit 0x%x\n",
1195                             __FUNCTION__,
1196                             vmcs_readl(GUEST_RSP),
1197                             vmcs_readl(GUEST_SS_BASE),
1198                             vmcs_read32(GUEST_SS_LIMIT));
1199                 return;
1200         }
1201
1202         if (kvm_read_guest(vcpu, irq * sizeof(ent), sizeof(ent), &ent) !=
1203                                                                 sizeof(ent)) {
1204                 vcpu_printf(vcpu, "%s: read guest err\n", __FUNCTION__);
1205                 return;
1206         }
1207
1208         flags =  vmcs_readl(GUEST_RFLAGS);
1209         cs =  vmcs_readl(GUEST_CS_BASE) >> 4;
1210         ip =  vmcs_readl(GUEST_RIP);
1211
1212
1213         if (kvm_write_guest(vcpu, ss_base + sp - 2, 2, &flags) != 2 ||
1214             kvm_write_guest(vcpu, ss_base + sp - 4, 2, &cs) != 2 ||
1215             kvm_write_guest(vcpu, ss_base + sp - 6, 2, &ip) != 2) {
1216                 vcpu_printf(vcpu, "%s: write guest err\n", __FUNCTION__);
1217                 return;
1218         }
1219
1220         vmcs_writel(GUEST_RFLAGS, flags &
1221                     ~( X86_EFLAGS_IF | X86_EFLAGS_AC | X86_EFLAGS_TF));
1222         vmcs_write16(GUEST_CS_SELECTOR, ent[1]) ;
1223         vmcs_writel(GUEST_CS_BASE, ent[1] << 4);
1224         vmcs_writel(GUEST_RIP, ent[0]);
1225         vmcs_writel(GUEST_RSP, (vmcs_readl(GUEST_RSP) & ~0xffff) | (sp - 6));
1226 }
1227
1228 static void kvm_do_inject_irq(struct kvm_vcpu *vcpu)
1229 {
1230         int word_index = __ffs(vcpu->irq_summary);
1231         int bit_index = __ffs(vcpu->irq_pending[word_index]);
1232         int irq = word_index * BITS_PER_LONG + bit_index;
1233
1234         clear_bit(bit_index, &vcpu->irq_pending[word_index]);
1235         if (!vcpu->irq_pending[word_index])
1236                 clear_bit(word_index, &vcpu->irq_summary);
1237
1238         if (vcpu->rmode.active) {
1239                 inject_rmode_irq(vcpu, irq);
1240                 return;
1241         }
1242         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
1243                         irq | INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
1244 }
1245
1246
1247 static void do_interrupt_requests(struct kvm_vcpu *vcpu,
1248                                        struct kvm_run *kvm_run)
1249 {
1250         u32 cpu_based_vm_exec_control;
1251
1252         vcpu->interrupt_window_open =
1253                 ((vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
1254                  (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 3) == 0);
1255
1256         if (vcpu->interrupt_window_open &&
1257             vcpu->irq_summary &&
1258             !(vmcs_read32(VM_ENTRY_INTR_INFO_FIELD) & INTR_INFO_VALID_MASK))
1259                 /*
1260                  * If interrupts enabled, and not blocked by sti or mov ss. Good.
1261                  */
1262                 kvm_do_inject_irq(vcpu);
1263
1264         cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
1265         if (!vcpu->interrupt_window_open &&
1266             (vcpu->irq_summary || kvm_run->request_interrupt_window))
1267                 /*
1268                  * Interrupts blocked.  Wait for unblock.
1269                  */
1270                 cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING;
1271         else
1272                 cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
1273         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
1274 }
1275
1276 static void kvm_guest_debug_pre(struct kvm_vcpu *vcpu)
1277 {
1278         struct kvm_guest_debug *dbg = &vcpu->guest_debug;
1279
1280         set_debugreg(dbg->bp[0], 0);
1281         set_debugreg(dbg->bp[1], 1);
1282         set_debugreg(dbg->bp[2], 2);
1283         set_debugreg(dbg->bp[3], 3);
1284
1285         if (dbg->singlestep) {
1286                 unsigned long flags;
1287
1288                 flags = vmcs_readl(GUEST_RFLAGS);
1289                 flags |= X86_EFLAGS_TF | X86_EFLAGS_RF;
1290                 vmcs_writel(GUEST_RFLAGS, flags);
1291         }
1292 }
1293
1294 static int handle_rmode_exception(struct kvm_vcpu *vcpu,
1295                                   int vec, u32 err_code)
1296 {
1297         if (!vcpu->rmode.active)
1298                 return 0;
1299
1300         if (vec == GP_VECTOR && err_code == 0)
1301                 if (emulate_instruction(vcpu, NULL, 0, 0) == EMULATE_DONE)
1302                         return 1;
1303         return 0;
1304 }
1305
1306 static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1307 {
1308         u32 intr_info, error_code;
1309         unsigned long cr2, rip;
1310         u32 vect_info;
1311         enum emulation_result er;
1312         int r;
1313
1314         vect_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
1315         intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
1316
1317         if ((vect_info & VECTORING_INFO_VALID_MASK) &&
1318                                                 !is_page_fault(intr_info)) {
1319                 printk(KERN_ERR "%s: unexpected, vectoring info 0x%x "
1320                        "intr info 0x%x\n", __FUNCTION__, vect_info, intr_info);
1321         }
1322
1323         if (is_external_interrupt(vect_info)) {
1324                 int irq = vect_info & VECTORING_INFO_VECTOR_MASK;
1325                 set_bit(irq, vcpu->irq_pending);
1326                 set_bit(irq / BITS_PER_LONG, &vcpu->irq_summary);
1327         }
1328
1329         if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == 0x200) { /* nmi */
1330                 asm ("int $2");
1331                 return 1;
1332         }
1333         error_code = 0;
1334         rip = vmcs_readl(GUEST_RIP);
1335         if (intr_info & INTR_INFO_DELIEVER_CODE_MASK)
1336                 error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
1337         if (is_page_fault(intr_info)) {
1338                 cr2 = vmcs_readl(EXIT_QUALIFICATION);
1339
1340                 spin_lock(&vcpu->kvm->lock);
1341                 r = kvm_mmu_page_fault(vcpu, cr2, error_code);
1342                 if (r < 0) {
1343                         spin_unlock(&vcpu->kvm->lock);
1344                         return r;
1345                 }
1346                 if (!r) {
1347                         spin_unlock(&vcpu->kvm->lock);
1348                         return 1;
1349                 }
1350
1351                 er = emulate_instruction(vcpu, kvm_run, cr2, error_code);
1352                 spin_unlock(&vcpu->kvm->lock);
1353
1354                 switch (er) {
1355                 case EMULATE_DONE:
1356                         return 1;
1357                 case EMULATE_DO_MMIO:
1358                         ++kvm_stat.mmio_exits;
1359                         kvm_run->exit_reason = KVM_EXIT_MMIO;
1360                         return 0;
1361                  case EMULATE_FAIL:
1362                         vcpu_printf(vcpu, "%s: emulate fail\n", __FUNCTION__);
1363                         break;
1364                 default:
1365                         BUG();
1366                 }
1367         }
1368
1369         if (vcpu->rmode.active &&
1370             handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK,
1371                                                                 error_code))
1372                 return 1;
1373
1374         if ((intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK)) == (INTR_TYPE_EXCEPTION | 1)) {
1375                 kvm_run->exit_reason = KVM_EXIT_DEBUG;
1376                 return 0;
1377         }
1378         kvm_run->exit_reason = KVM_EXIT_EXCEPTION;
1379         kvm_run->ex.exception = intr_info & INTR_INFO_VECTOR_MASK;
1380         kvm_run->ex.error_code = error_code;
1381         return 0;
1382 }
1383
1384 static int handle_external_interrupt(struct kvm_vcpu *vcpu,
1385                                      struct kvm_run *kvm_run)
1386 {
1387         ++kvm_stat.irq_exits;
1388         return 1;
1389 }
1390
1391 static int handle_triple_fault(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1392 {
1393         kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
1394         return 0;
1395 }
1396
1397 static int get_io_count(struct kvm_vcpu *vcpu, unsigned long *count)
1398 {
1399         u64 inst;
1400         gva_t rip;
1401         int countr_size;
1402         int i, n;
1403
1404         if ((vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_VM)) {
1405                 countr_size = 2;
1406         } else {
1407                 u32 cs_ar = vmcs_read32(GUEST_CS_AR_BYTES);
1408
1409                 countr_size = (cs_ar & AR_L_MASK) ? 8:
1410                               (cs_ar & AR_DB_MASK) ? 4: 2;
1411         }
1412
1413         rip =  vmcs_readl(GUEST_RIP);
1414         if (countr_size != 8)
1415                 rip += vmcs_readl(GUEST_CS_BASE);
1416
1417         n = kvm_read_guest(vcpu, rip, sizeof(inst), &inst);
1418
1419         for (i = 0; i < n; i++) {
1420                 switch (((u8*)&inst)[i]) {
1421                 case 0xf0:
1422                 case 0xf2:
1423                 case 0xf3:
1424                 case 0x2e:
1425                 case 0x36:
1426                 case 0x3e:
1427                 case 0x26:
1428                 case 0x64:
1429                 case 0x65:
1430                 case 0x66:
1431                         break;
1432                 case 0x67:
1433                         countr_size = (countr_size == 2) ? 4: (countr_size >> 1);
1434                 default:
1435                         goto done;
1436                 }
1437         }
1438         return 0;
1439 done:
1440         countr_size *= 8;
1441         *count = vcpu->regs[VCPU_REGS_RCX] & (~0ULL >> (64 - countr_size));
1442         //printk("cx: %lx\n", vcpu->regs[VCPU_REGS_RCX]);
1443         return 1;
1444 }
1445
1446 static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1447 {
1448         u64 exit_qualification;
1449         int size, down, in, string, rep;
1450         unsigned port;
1451         unsigned long count;
1452         gva_t address;
1453
1454         ++kvm_stat.io_exits;
1455         exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
1456         in = (exit_qualification & 8) != 0;
1457         size = (exit_qualification & 7) + 1;
1458         string = (exit_qualification & 16) != 0;
1459         down = (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_DF) != 0;
1460         count = 1;
1461         rep = (exit_qualification & 32) != 0;
1462         port = exit_qualification >> 16;
1463         address = 0;
1464         if (string) {
1465                 if (rep && !get_io_count(vcpu, &count))
1466                         return 1;
1467                 address = vmcs_readl(GUEST_LINEAR_ADDRESS);
1468         }
1469         return kvm_setup_pio(vcpu, kvm_run, in, size, count, string, down,
1470                              address, rep, port);
1471 }
1472
1473 static void
1474 vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
1475 {
1476         /*
1477          * Patch in the VMCALL instruction:
1478          */
1479         hypercall[0] = 0x0f;
1480         hypercall[1] = 0x01;
1481         hypercall[2] = 0xc1;
1482         hypercall[3] = 0xc3;
1483 }
1484
1485 static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1486 {
1487         u64 exit_qualification;
1488         int cr;
1489         int reg;
1490
1491         exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
1492         cr = exit_qualification & 15;
1493         reg = (exit_qualification >> 8) & 15;
1494         switch ((exit_qualification >> 4) & 3) {
1495         case 0: /* mov to cr */
1496                 switch (cr) {
1497                 case 0:
1498                         vcpu_load_rsp_rip(vcpu);
1499                         set_cr0(vcpu, vcpu->regs[reg]);
1500                         skip_emulated_instruction(vcpu);
1501                         return 1;
1502                 case 3:
1503                         vcpu_load_rsp_rip(vcpu);
1504                         set_cr3(vcpu, vcpu->regs[reg]);
1505                         skip_emulated_instruction(vcpu);
1506                         return 1;
1507                 case 4:
1508                         vcpu_load_rsp_rip(vcpu);
1509                         set_cr4(vcpu, vcpu->regs[reg]);
1510                         skip_emulated_instruction(vcpu);
1511                         return 1;
1512                 case 8:
1513                         vcpu_load_rsp_rip(vcpu);
1514                         set_cr8(vcpu, vcpu->regs[reg]);
1515                         skip_emulated_instruction(vcpu);
1516                         return 1;
1517                 };
1518                 break;
1519         case 1: /*mov from cr*/
1520                 switch (cr) {
1521                 case 3:
1522                         vcpu_load_rsp_rip(vcpu);
1523                         vcpu->regs[reg] = vcpu->cr3;
1524                         vcpu_put_rsp_rip(vcpu);
1525                         skip_emulated_instruction(vcpu);
1526                         return 1;
1527                 case 8:
1528                         printk(KERN_DEBUG "handle_cr: read CR8 "
1529                                "cpu erratum AA15\n");
1530                         vcpu_load_rsp_rip(vcpu);
1531                         vcpu->regs[reg] = vcpu->cr8;
1532                         vcpu_put_rsp_rip(vcpu);
1533                         skip_emulated_instruction(vcpu);
1534                         return 1;
1535                 }
1536                 break;
1537         case 3: /* lmsw */
1538                 lmsw(vcpu, (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f);
1539
1540                 skip_emulated_instruction(vcpu);
1541                 return 1;
1542         default:
1543                 break;
1544         }
1545         kvm_run->exit_reason = 0;
1546         printk(KERN_ERR "kvm: unhandled control register: op %d cr %d\n",
1547                (int)(exit_qualification >> 4) & 3, cr);
1548         return 0;
1549 }
1550
1551 static int handle_dr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1552 {
1553         u64 exit_qualification;
1554         unsigned long val;
1555         int dr, reg;
1556
1557         /*
1558          * FIXME: this code assumes the host is debugging the guest.
1559          *        need to deal with guest debugging itself too.
1560          */
1561         exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
1562         dr = exit_qualification & 7;
1563         reg = (exit_qualification >> 8) & 15;
1564         vcpu_load_rsp_rip(vcpu);
1565         if (exit_qualification & 16) {
1566                 /* mov from dr */
1567                 switch (dr) {
1568                 case 6:
1569                         val = 0xffff0ff0;
1570                         break;
1571                 case 7:
1572                         val = 0x400;
1573                         break;
1574                 default:
1575                         val = 0;
1576                 }
1577                 vcpu->regs[reg] = val;
1578         } else {
1579                 /* mov to dr */
1580         }
1581         vcpu_put_rsp_rip(vcpu);
1582         skip_emulated_instruction(vcpu);
1583         return 1;
1584 }
1585
1586 static int handle_cpuid(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1587 {
1588         kvm_emulate_cpuid(vcpu);
1589         return 1;
1590 }
1591
1592 static int handle_rdmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1593 {
1594         u32 ecx = vcpu->regs[VCPU_REGS_RCX];
1595         u64 data;
1596
1597         if (vmx_get_msr(vcpu, ecx, &data)) {
1598                 vmx_inject_gp(vcpu, 0);
1599                 return 1;
1600         }
1601
1602         /* FIXME: handling of bits 32:63 of rax, rdx */
1603         vcpu->regs[VCPU_REGS_RAX] = data & -1u;
1604         vcpu->regs[VCPU_REGS_RDX] = (data >> 32) & -1u;
1605         skip_emulated_instruction(vcpu);
1606         return 1;
1607 }
1608
1609 static int handle_wrmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1610 {
1611         u32 ecx = vcpu->regs[VCPU_REGS_RCX];
1612         u64 data = (vcpu->regs[VCPU_REGS_RAX] & -1u)
1613                 | ((u64)(vcpu->regs[VCPU_REGS_RDX] & -1u) << 32);
1614
1615         if (vmx_set_msr(vcpu, ecx, data) != 0) {
1616                 vmx_inject_gp(vcpu, 0);
1617                 return 1;
1618         }
1619
1620         skip_emulated_instruction(vcpu);
1621         return 1;
1622 }
1623
1624 static void post_kvm_run_save(struct kvm_vcpu *vcpu,
1625                               struct kvm_run *kvm_run)
1626 {
1627         kvm_run->if_flag = (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) != 0;
1628         kvm_run->cr8 = vcpu->cr8;
1629         kvm_run->apic_base = vcpu->apic_base;
1630         kvm_run->ready_for_interrupt_injection = (vcpu->interrupt_window_open &&
1631                                                   vcpu->irq_summary == 0);
1632 }
1633
1634 static int handle_interrupt_window(struct kvm_vcpu *vcpu,
1635                                    struct kvm_run *kvm_run)
1636 {
1637         /*
1638          * If the user space waits to inject interrupts, exit as soon as
1639          * possible
1640          */
1641         if (kvm_run->request_interrupt_window &&
1642             !vcpu->irq_summary) {
1643                 kvm_run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
1644                 ++kvm_stat.irq_window_exits;
1645                 return 0;
1646         }
1647         return 1;
1648 }
1649
1650 static int handle_halt(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1651 {
1652         skip_emulated_instruction(vcpu);
1653         if (vcpu->irq_summary)
1654                 return 1;
1655
1656         kvm_run->exit_reason = KVM_EXIT_HLT;
1657         ++kvm_stat.halt_exits;
1658         return 0;
1659 }
1660
1661 static int handle_vmcall(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1662 {
1663         skip_emulated_instruction(vcpu);
1664         return kvm_hypercall(vcpu, kvm_run);
1665 }
1666
1667 /*
1668  * The exit handlers return 1 if the exit was handled fully and guest execution
1669  * may resume.  Otherwise they set the kvm_run parameter to indicate what needs
1670  * to be done to userspace and return 0.
1671  */
1672 static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu,
1673                                       struct kvm_run *kvm_run) = {
1674         [EXIT_REASON_EXCEPTION_NMI]           = handle_exception,
1675         [EXIT_REASON_EXTERNAL_INTERRUPT]      = handle_external_interrupt,
1676         [EXIT_REASON_TRIPLE_FAULT]            = handle_triple_fault,
1677         [EXIT_REASON_IO_INSTRUCTION]          = handle_io,
1678         [EXIT_REASON_CR_ACCESS]               = handle_cr,
1679         [EXIT_REASON_DR_ACCESS]               = handle_dr,
1680         [EXIT_REASON_CPUID]                   = handle_cpuid,
1681         [EXIT_REASON_MSR_READ]                = handle_rdmsr,
1682         [EXIT_REASON_MSR_WRITE]               = handle_wrmsr,
1683         [EXIT_REASON_PENDING_INTERRUPT]       = handle_interrupt_window,
1684         [EXIT_REASON_HLT]                     = handle_halt,
1685         [EXIT_REASON_VMCALL]                  = handle_vmcall,
1686 };
1687
1688 static const int kvm_vmx_max_exit_handlers =
1689         sizeof(kvm_vmx_exit_handlers) / sizeof(*kvm_vmx_exit_handlers);
1690
1691 /*
1692  * The guest has exited.  See if we can fix it or if we need userspace
1693  * assistance.
1694  */
1695 static int kvm_handle_exit(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
1696 {
1697         u32 vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
1698         u32 exit_reason = vmcs_read32(VM_EXIT_REASON);
1699
1700         if ( (vectoring_info & VECTORING_INFO_VALID_MASK) &&
1701                                 exit_reason != EXIT_REASON_EXCEPTION_NMI )
1702                 printk(KERN_WARNING "%s: unexpected, valid vectoring info and "
1703                        "exit reason is 0x%x\n", __FUNCTION__, exit_reason);
1704         kvm_run->instruction_length = vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
1705         if (exit_reason < kvm_vmx_max_exit_handlers
1706             && kvm_vmx_exit_handlers[exit_reason])
1707                 return kvm_vmx_exit_handlers[exit_reason](vcpu, kvm_run);
1708         else {
1709                 kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
1710                 kvm_run->hw.hardware_exit_reason = exit_reason;
1711         }
1712         return 0;
1713 }
1714
1715 /*
1716  * Check if userspace requested an interrupt window, and that the
1717  * interrupt window is open.
1718  *
1719  * No need to exit to userspace if we already have an interrupt queued.
1720  */
1721 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu,
1722                                           struct kvm_run *kvm_run)
1723 {
1724         return (!vcpu->irq_summary &&
1725                 kvm_run->request_interrupt_window &&
1726                 vcpu->interrupt_window_open &&
1727                 (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF));
1728 }
1729
1730 static int vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1731 {
1732         u8 fail;
1733         u16 fs_sel, gs_sel, ldt_sel;
1734         int fs_gs_ldt_reload_needed;
1735         int r;
1736
1737 again:
1738         /*
1739          * Set host fs and gs selectors.  Unfortunately, 22.2.3 does not
1740          * allow segment selectors with cpl > 0 or ti == 1.
1741          */
1742         fs_sel = read_fs();
1743         gs_sel = read_gs();
1744         ldt_sel = read_ldt();
1745         fs_gs_ldt_reload_needed = (fs_sel & 7) | (gs_sel & 7) | ldt_sel;
1746         if (!fs_gs_ldt_reload_needed) {
1747                 vmcs_write16(HOST_FS_SELECTOR, fs_sel);
1748                 vmcs_write16(HOST_GS_SELECTOR, gs_sel);
1749         } else {
1750                 vmcs_write16(HOST_FS_SELECTOR, 0);
1751                 vmcs_write16(HOST_GS_SELECTOR, 0);
1752         }
1753
1754 #ifdef CONFIG_X86_64
1755         vmcs_writel(HOST_FS_BASE, read_msr(MSR_FS_BASE));
1756         vmcs_writel(HOST_GS_BASE, read_msr(MSR_GS_BASE));
1757 #else
1758         vmcs_writel(HOST_FS_BASE, segment_base(fs_sel));
1759         vmcs_writel(HOST_GS_BASE, segment_base(gs_sel));
1760 #endif
1761
1762         if (!vcpu->mmio_read_completed)
1763                 do_interrupt_requests(vcpu, kvm_run);
1764
1765         if (vcpu->guest_debug.enabled)
1766                 kvm_guest_debug_pre(vcpu);
1767
1768         fx_save(vcpu->host_fx_image);
1769         fx_restore(vcpu->guest_fx_image);
1770
1771         save_msrs(vcpu->host_msrs, vcpu->nmsrs);
1772         load_msrs(vcpu->guest_msrs, NR_BAD_MSRS);
1773
1774         asm (
1775                 /* Store host registers */
1776                 "pushf \n\t"
1777 #ifdef CONFIG_X86_64
1778                 "push %%rax; push %%rbx; push %%rdx;"
1779                 "push %%rsi; push %%rdi; push %%rbp;"
1780                 "push %%r8;  push %%r9;  push %%r10; push %%r11;"
1781                 "push %%r12; push %%r13; push %%r14; push %%r15;"
1782                 "push %%rcx \n\t"
1783                 ASM_VMX_VMWRITE_RSP_RDX "\n\t"
1784 #else
1785                 "pusha; push %%ecx \n\t"
1786                 ASM_VMX_VMWRITE_RSP_RDX "\n\t"
1787 #endif
1788                 /* Check if vmlaunch of vmresume is needed */
1789                 "cmp $0, %1 \n\t"
1790                 /* Load guest registers.  Don't clobber flags. */
1791 #ifdef CONFIG_X86_64
1792                 "mov %c[cr2](%3), %%rax \n\t"
1793                 "mov %%rax, %%cr2 \n\t"
1794                 "mov %c[rax](%3), %%rax \n\t"
1795                 "mov %c[rbx](%3), %%rbx \n\t"
1796                 "mov %c[rdx](%3), %%rdx \n\t"
1797                 "mov %c[rsi](%3), %%rsi \n\t"
1798                 "mov %c[rdi](%3), %%rdi \n\t"
1799                 "mov %c[rbp](%3), %%rbp \n\t"
1800                 "mov %c[r8](%3),  %%r8  \n\t"
1801                 "mov %c[r9](%3),  %%r9  \n\t"
1802                 "mov %c[r10](%3), %%r10 \n\t"
1803                 "mov %c[r11](%3), %%r11 \n\t"
1804                 "mov %c[r12](%3), %%r12 \n\t"
1805                 "mov %c[r13](%3), %%r13 \n\t"
1806                 "mov %c[r14](%3), %%r14 \n\t"
1807                 "mov %c[r15](%3), %%r15 \n\t"
1808                 "mov %c[rcx](%3), %%rcx \n\t" /* kills %3 (rcx) */
1809 #else
1810                 "mov %c[cr2](%3), %%eax \n\t"
1811                 "mov %%eax,   %%cr2 \n\t"
1812                 "mov %c[rax](%3), %%eax \n\t"
1813                 "mov %c[rbx](%3), %%ebx \n\t"
1814                 "mov %c[rdx](%3), %%edx \n\t"
1815                 "mov %c[rsi](%3), %%esi \n\t"
1816                 "mov %c[rdi](%3), %%edi \n\t"
1817                 "mov %c[rbp](%3), %%ebp \n\t"
1818                 "mov %c[rcx](%3), %%ecx \n\t" /* kills %3 (ecx) */
1819 #endif
1820                 /* Enter guest mode */
1821                 "jne launched \n\t"
1822                 ASM_VMX_VMLAUNCH "\n\t"
1823                 "jmp kvm_vmx_return \n\t"
1824                 "launched: " ASM_VMX_VMRESUME "\n\t"
1825                 ".globl kvm_vmx_return \n\t"
1826                 "kvm_vmx_return: "
1827                 /* Save guest registers, load host registers, keep flags */
1828 #ifdef CONFIG_X86_64
1829                 "xchg %3,     (%%rsp) \n\t"
1830                 "mov %%rax, %c[rax](%3) \n\t"
1831                 "mov %%rbx, %c[rbx](%3) \n\t"
1832                 "pushq (%%rsp); popq %c[rcx](%3) \n\t"
1833                 "mov %%rdx, %c[rdx](%3) \n\t"
1834                 "mov %%rsi, %c[rsi](%3) \n\t"
1835                 "mov %%rdi, %c[rdi](%3) \n\t"
1836                 "mov %%rbp, %c[rbp](%3) \n\t"
1837                 "mov %%r8,  %c[r8](%3) \n\t"
1838                 "mov %%r9,  %c[r9](%3) \n\t"
1839                 "mov %%r10, %c[r10](%3) \n\t"
1840                 "mov %%r11, %c[r11](%3) \n\t"
1841                 "mov %%r12, %c[r12](%3) \n\t"
1842                 "mov %%r13, %c[r13](%3) \n\t"
1843                 "mov %%r14, %c[r14](%3) \n\t"
1844                 "mov %%r15, %c[r15](%3) \n\t"
1845                 "mov %%cr2, %%rax   \n\t"
1846                 "mov %%rax, %c[cr2](%3) \n\t"
1847                 "mov (%%rsp), %3 \n\t"
1848
1849                 "pop  %%rcx; pop  %%r15; pop  %%r14; pop  %%r13; pop  %%r12;"
1850                 "pop  %%r11; pop  %%r10; pop  %%r9;  pop  %%r8;"
1851                 "pop  %%rbp; pop  %%rdi; pop  %%rsi;"
1852                 "pop  %%rdx; pop  %%rbx; pop  %%rax \n\t"
1853 #else
1854                 "xchg %3, (%%esp) \n\t"
1855                 "mov %%eax, %c[rax](%3) \n\t"
1856                 "mov %%ebx, %c[rbx](%3) \n\t"
1857                 "pushl (%%esp); popl %c[rcx](%3) \n\t"
1858                 "mov %%edx, %c[rdx](%3) \n\t"
1859                 "mov %%esi, %c[rsi](%3) \n\t"
1860                 "mov %%edi, %c[rdi](%3) \n\t"
1861                 "mov %%ebp, %c[rbp](%3) \n\t"
1862                 "mov %%cr2, %%eax  \n\t"
1863                 "mov %%eax, %c[cr2](%3) \n\t"
1864                 "mov (%%esp), %3 \n\t"
1865
1866                 "pop %%ecx; popa \n\t"
1867 #endif
1868                 "setbe %0 \n\t"
1869                 "popf \n\t"
1870               : "=q" (fail)
1871               : "r"(vcpu->launched), "d"((unsigned long)HOST_RSP),
1872                 "c"(vcpu),
1873                 [rax]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RAX])),
1874                 [rbx]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RBX])),
1875                 [rcx]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RCX])),
1876                 [rdx]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RDX])),
1877                 [rsi]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RSI])),
1878                 [rdi]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RDI])),
1879                 [rbp]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_RBP])),
1880 #ifdef CONFIG_X86_64
1881                 [r8 ]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R8 ])),
1882                 [r9 ]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R9 ])),
1883                 [r10]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R10])),
1884                 [r11]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R11])),
1885                 [r12]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R12])),
1886                 [r13]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R13])),
1887                 [r14]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R14])),
1888                 [r15]"i"(offsetof(struct kvm_vcpu, regs[VCPU_REGS_R15])),
1889 #endif
1890                 [cr2]"i"(offsetof(struct kvm_vcpu, cr2))
1891               : "cc", "memory" );
1892
1893         /*
1894          * Reload segment selectors ASAP. (it's needed for a functional
1895          * kernel: x86 relies on having __KERNEL_PDA in %fs and x86_64
1896          * relies on having 0 in %gs for the CPU PDA to work.)
1897          */
1898         if (fs_gs_ldt_reload_needed) {
1899                 load_ldt(ldt_sel);
1900                 load_fs(fs_sel);
1901                 /*
1902                  * If we have to reload gs, we must take care to
1903                  * preserve our gs base.
1904                  */
1905                 local_irq_disable();
1906                 load_gs(gs_sel);
1907 #ifdef CONFIG_X86_64
1908                 wrmsrl(MSR_GS_BASE, vmcs_readl(HOST_GS_BASE));
1909 #endif
1910                 local_irq_enable();
1911
1912                 reload_tss();
1913         }
1914         ++kvm_stat.exits;
1915
1916         save_msrs(vcpu->guest_msrs, NR_BAD_MSRS);
1917         load_msrs(vcpu->host_msrs, NR_BAD_MSRS);
1918
1919         fx_save(vcpu->guest_fx_image);
1920         fx_restore(vcpu->host_fx_image);
1921         vcpu->interrupt_window_open = (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 3) == 0;
1922
1923         asm ("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS));
1924
1925         if (fail) {
1926                 kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
1927                 kvm_run->fail_entry.hardware_entry_failure_reason
1928                         = vmcs_read32(VM_INSTRUCTION_ERROR);
1929                 r = 0;
1930         } else {
1931                 /*
1932                  * Profile KVM exit RIPs:
1933                  */
1934                 if (unlikely(prof_on == KVM_PROFILING))
1935                         profile_hit(KVM_PROFILING, (void *)vmcs_readl(GUEST_RIP));
1936
1937                 vcpu->launched = 1;
1938                 r = kvm_handle_exit(kvm_run, vcpu);
1939                 if (r > 0) {
1940                         /* Give scheduler a change to reschedule. */
1941                         if (signal_pending(current)) {
1942                                 ++kvm_stat.signal_exits;
1943                                 post_kvm_run_save(vcpu, kvm_run);
1944                                 kvm_run->exit_reason = KVM_EXIT_INTR;
1945                                 return -EINTR;
1946                         }
1947
1948                         if (dm_request_for_irq_injection(vcpu, kvm_run)) {
1949                                 ++kvm_stat.request_irq_exits;
1950                                 post_kvm_run_save(vcpu, kvm_run);
1951                                 kvm_run->exit_reason = KVM_EXIT_INTR;
1952                                 return -EINTR;
1953                         }
1954
1955                         kvm_resched(vcpu);
1956                         goto again;
1957                 }
1958         }
1959
1960         post_kvm_run_save(vcpu, kvm_run);
1961         return r;
1962 }
1963
1964 static void vmx_flush_tlb(struct kvm_vcpu *vcpu)
1965 {
1966         vmcs_writel(GUEST_CR3, vmcs_readl(GUEST_CR3));
1967 }
1968
1969 static void vmx_inject_page_fault(struct kvm_vcpu *vcpu,
1970                                   unsigned long addr,
1971                                   u32 err_code)
1972 {
1973         u32 vect_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
1974
1975         ++kvm_stat.pf_guest;
1976
1977         if (is_page_fault(vect_info)) {
1978                 printk(KERN_DEBUG "inject_page_fault: "
1979                        "double fault 0x%lx @ 0x%lx\n",
1980                        addr, vmcs_readl(GUEST_RIP));
1981                 vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, 0);
1982                 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
1983                              DF_VECTOR |
1984                              INTR_TYPE_EXCEPTION |
1985                              INTR_INFO_DELIEVER_CODE_MASK |
1986                              INTR_INFO_VALID_MASK);
1987                 return;
1988         }
1989         vcpu->cr2 = addr;
1990         vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, err_code);
1991         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
1992                      PF_VECTOR |
1993                      INTR_TYPE_EXCEPTION |
1994                      INTR_INFO_DELIEVER_CODE_MASK |
1995                      INTR_INFO_VALID_MASK);
1996
1997 }
1998
1999 static void vmx_free_vmcs(struct kvm_vcpu *vcpu)
2000 {
2001         if (vcpu->vmcs) {
2002                 on_each_cpu(__vcpu_clear, vcpu, 0, 1);
2003                 free_vmcs(vcpu->vmcs);
2004                 vcpu->vmcs = NULL;
2005         }
2006 }
2007
2008 static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
2009 {
2010         vmx_free_vmcs(vcpu);
2011 }
2012
2013 static int vmx_create_vcpu(struct kvm_vcpu *vcpu)
2014 {
2015         struct vmcs *vmcs;
2016
2017         vcpu->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
2018         if (!vcpu->guest_msrs)
2019                 return -ENOMEM;
2020
2021         vcpu->host_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
2022         if (!vcpu->host_msrs)
2023                 goto out_free_guest_msrs;
2024
2025         vmcs = alloc_vmcs();
2026         if (!vmcs)
2027                 goto out_free_msrs;
2028
2029         vmcs_clear(vmcs);
2030         vcpu->vmcs = vmcs;
2031         vcpu->launched = 0;
2032
2033         return 0;
2034
2035 out_free_msrs:
2036         kfree(vcpu->host_msrs);
2037         vcpu->host_msrs = NULL;
2038
2039 out_free_guest_msrs:
2040         kfree(vcpu->guest_msrs);
2041         vcpu->guest_msrs = NULL;
2042
2043         return -ENOMEM;
2044 }
2045
2046 static struct kvm_arch_ops vmx_arch_ops = {
2047         .cpu_has_kvm_support = cpu_has_kvm_support,
2048         .disabled_by_bios = vmx_disabled_by_bios,
2049         .hardware_setup = hardware_setup,
2050         .hardware_unsetup = hardware_unsetup,
2051         .hardware_enable = hardware_enable,
2052         .hardware_disable = hardware_disable,
2053
2054         .vcpu_create = vmx_create_vcpu,
2055         .vcpu_free = vmx_free_vcpu,
2056
2057         .vcpu_load = vmx_vcpu_load,
2058         .vcpu_put = vmx_vcpu_put,
2059         .vcpu_decache = vmx_vcpu_decache,
2060
2061         .set_guest_debug = set_guest_debug,
2062         .get_msr = vmx_get_msr,
2063         .set_msr = vmx_set_msr,
2064         .get_segment_base = vmx_get_segment_base,
2065         .get_segment = vmx_get_segment,
2066         .set_segment = vmx_set_segment,
2067         .get_cs_db_l_bits = vmx_get_cs_db_l_bits,
2068         .decache_cr0_cr4_guest_bits = vmx_decache_cr0_cr4_guest_bits,
2069         .set_cr0 = vmx_set_cr0,
2070         .set_cr0_no_modeswitch = vmx_set_cr0_no_modeswitch,
2071         .set_cr3 = vmx_set_cr3,
2072         .set_cr4 = vmx_set_cr4,
2073 #ifdef CONFIG_X86_64
2074         .set_efer = vmx_set_efer,
2075 #endif
2076         .get_idt = vmx_get_idt,
2077         .set_idt = vmx_set_idt,
2078         .get_gdt = vmx_get_gdt,
2079         .set_gdt = vmx_set_gdt,
2080         .cache_regs = vcpu_load_rsp_rip,
2081         .decache_regs = vcpu_put_rsp_rip,
2082         .get_rflags = vmx_get_rflags,
2083         .set_rflags = vmx_set_rflags,
2084
2085         .tlb_flush = vmx_flush_tlb,
2086         .inject_page_fault = vmx_inject_page_fault,
2087
2088         .inject_gp = vmx_inject_gp,
2089
2090         .run = vmx_vcpu_run,
2091         .skip_emulated_instruction = skip_emulated_instruction,
2092         .vcpu_setup = vmx_vcpu_setup,
2093         .patch_hypercall = vmx_patch_hypercall,
2094 };
2095
2096 static int __init vmx_init(void)
2097 {
2098         return kvm_init_arch(&vmx_arch_ops, THIS_MODULE);
2099 }
2100
2101 static void __exit vmx_exit(void)
2102 {
2103         kvm_exit_arch();
2104 }
2105
2106 module_init(vmx_init)
2107 module_exit(vmx_exit)