git.oblomov.eu Git - linux-2.6/blob - arch/x86/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 "irq.h"
  19 #include "mmu.h"
  20
  21 #include <linux/kvm_host.h>
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/mm.h>
  25 #include <linux/highmem.h>
  26 #include <linux/sched.h>
  27 #include <linux/moduleparam.h>
  28 #include "kvm_cache_regs.h"
  29 #include "x86.h"
  30
  31 #include <asm/io.h>
  32 #include <asm/desc.h>
  33 #include <asm/vmx.h>
  34 #include <asm/virtext.h>
  35
  36 #define __ex(x) __kvm_handle_fault_on_reboot(x)
  37
  38 MODULE_AUTHOR("Qumranet");
  39 MODULE_LICENSE("GPL");
  40
  41 static int bypass_guest_pf = 1;
  42 module_param(bypass_guest_pf, bool, 0);
  43
  44 static int enable_vpid = 1;
  45 module_param(enable_vpid, bool, 0);
  46
  47 static int flexpriority_enabled = 1;
  48 module_param(flexpriority_enabled, bool, 0);
  49
  50 static int enable_ept = 1;
  51 module_param(enable_ept, bool, 0);
  52
  53 static int emulate_invalid_guest_state = 0;
  54 module_param(emulate_invalid_guest_state, bool, 0);
  55
  56 struct vmcs {
  57         u32 revision_id;
  58         u32 abort;
  59         char data[0];
  60 };
  61
  62 struct vcpu_vmx {
  63         struct kvm_vcpu       vcpu;
  64         struct list_head      local_vcpus_link;
  65         unsigned long         host_rsp;
  66         int                   launched;
  67         u8                    fail;
  68         u32                   idt_vectoring_info;
  69         struct kvm_msr_entry *guest_msrs;
  70         struct kvm_msr_entry *host_msrs;
  71         int                   nmsrs;
  72         int                   save_nmsrs;
  73         int                   msr_offset_efer;
  74 #ifdef CONFIG_X86_64
  75         int                   msr_offset_kernel_gs_base;
  76 #endif
  77         struct vmcs          *vmcs;
  78         struct {
  79                 int           loaded;
  80                 u16           fs_sel, gs_sel, ldt_sel;
  81                 int           gs_ldt_reload_needed;
  82                 int           fs_reload_needed;
  83                 int           guest_efer_loaded;
  84         } host_state;
  85         struct {
  86                 struct {
  87                         bool pending;
  88                         u8 vector;
  89                         unsigned rip;
  90                 } irq;
  91         } rmode;
  92         int vpid;
  93         bool emulation_required;
  94         enum emulation_result invalid_state_emulation_result;
  95
  96         /* Support for vnmi-less CPUs */
  97         int soft_vnmi_blocked;
  98         ktime_t entry_time;
  99         s64 vnmi_blocked_time;
 100 };
 101
 102 static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu)
 103 {
 104         return container_of(vcpu, struct vcpu_vmx, vcpu);
 105 }
 106
 107 static int init_rmode(struct kvm *kvm);
 108 static u64 construct_eptp(unsigned long root_hpa);
 109
 110 static DEFINE_PER_CPU(struct vmcs *, vmxarea);
 111 static DEFINE_PER_CPU(struct vmcs *, current_vmcs);
 112 static DEFINE_PER_CPU(struct list_head, vcpus_on_cpu);
 113
 114 static struct page *vmx_io_bitmap_a;
 115 static struct page *vmx_io_bitmap_b;
 116 static struct page *vmx_msr_bitmap;
 117
 118 static DECLARE_BITMAP(vmx_vpid_bitmap, VMX_NR_VPIDS);
 119 static DEFINE_SPINLOCK(vmx_vpid_lock);
 120
 121 static struct vmcs_config {
 122         int size;
 123         int order;
 124         u32 revision_id;
 125         u32 pin_based_exec_ctrl;
 126         u32 cpu_based_exec_ctrl;
 127         u32 cpu_based_2nd_exec_ctrl;
 128         u32 vmexit_ctrl;
 129         u32 vmentry_ctrl;
 130 } vmcs_config;
 131
 132 static struct vmx_capability {
 133         u32 ept;
 134         u32 vpid;
 135 } vmx_capability;
 136
 137 #define VMX_SEGMENT_FIELD(seg)                                  \
 138         [VCPU_SREG_##seg] = {                                   \
 139                 .selector = GUEST_##seg##_SELECTOR,             \
 140                 .base = GUEST_##seg##_BASE,                     \
 141                 .limit = GUEST_##seg##_LIMIT,                   \
 142                 .ar_bytes = GUEST_##seg##_AR_BYTES,             \
 143         }
 144
 145 static struct kvm_vmx_segment_field {
 146         unsigned selector;
 147         unsigned base;
 148         unsigned limit;
 149         unsigned ar_bytes;
 150 } kvm_vmx_segment_fields[] = {
 151         VMX_SEGMENT_FIELD(CS),
 152         VMX_SEGMENT_FIELD(DS),
 153         VMX_SEGMENT_FIELD(ES),
 154         VMX_SEGMENT_FIELD(FS),
 155         VMX_SEGMENT_FIELD(GS),
 156         VMX_SEGMENT_FIELD(SS),
 157         VMX_SEGMENT_FIELD(TR),
 158         VMX_SEGMENT_FIELD(LDTR),
 159 };
 160
 161 /*
 162  * Keep MSR_K6_STAR at the end, as setup_msrs() will try to optimize it
 163  * away by decrementing the array size.
 164  */
 165 static const u32 vmx_msr_index[] = {
 166 #ifdef CONFIG_X86_64
 167         MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR, MSR_KERNEL_GS_BASE,
 168 #endif
 169         MSR_EFER, MSR_K6_STAR,
 170 };
 171 #define NR_VMX_MSR ARRAY_SIZE(vmx_msr_index)
 172
 173 static void load_msrs(struct kvm_msr_entry *e, int n)
 174 {
 175         int i;
 176
 177         for (i = 0; i < n; ++i)
 178                 wrmsrl(e[i].index, e[i].data);
 179 }
 180
 181 static void save_msrs(struct kvm_msr_entry *e, int n)
 182 {
 183         int i;
 184
 185         for (i = 0; i < n; ++i)
 186                 rdmsrl(e[i].index, e[i].data);
 187 }
 188
 189 static inline int is_page_fault(u32 intr_info)
 190 {
 191         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
 192                              INTR_INFO_VALID_MASK)) ==
 193                 (INTR_TYPE_HARD_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK);
 194 }
 195
 196 static inline int is_no_device(u32 intr_info)
 197 {
 198         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
 199                              INTR_INFO_VALID_MASK)) ==
 200                 (INTR_TYPE_HARD_EXCEPTION | NM_VECTOR | INTR_INFO_VALID_MASK);
 201 }
 202
 203 static inline int is_invalid_opcode(u32 intr_info)
 204 {
 205         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
 206                              INTR_INFO_VALID_MASK)) ==
 207                 (INTR_TYPE_HARD_EXCEPTION | UD_VECTOR | INTR_INFO_VALID_MASK);
 208 }
 209
 210 static inline int is_external_interrupt(u32 intr_info)
 211 {
 212         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
 213                 == (INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
 214 }
 215
 216 static inline int cpu_has_vmx_msr_bitmap(void)
 217 {
 218         return (vmcs_config.cpu_based_exec_ctrl & CPU_BASED_USE_MSR_BITMAPS);
 219 }
 220
 221 static inline int cpu_has_vmx_tpr_shadow(void)
 222 {
 223         return (vmcs_config.cpu_based_exec_ctrl & CPU_BASED_TPR_SHADOW);
 224 }
 225
 226 static inline int vm_need_tpr_shadow(struct kvm *kvm)
 227 {
 228         return ((cpu_has_vmx_tpr_shadow()) && (irqchip_in_kernel(kvm)));
 229 }
 230
 231 static inline int cpu_has_secondary_exec_ctrls(void)
 232 {
 233         return (vmcs_config.cpu_based_exec_ctrl &
 234                 CPU_BASED_ACTIVATE_SECONDARY_CONTROLS);
 235 }
 236
 237 static inline bool cpu_has_vmx_virtualize_apic_accesses(void)
 238 {
 239         return flexpriority_enabled
 240                 && (vmcs_config.cpu_based_2nd_exec_ctrl &
 241                     SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES);
 242 }
 243
 244 static inline int cpu_has_vmx_invept_individual_addr(void)
 245 {
 246         return (!!(vmx_capability.ept & VMX_EPT_EXTENT_INDIVIDUAL_BIT));
 247 }
 248
 249 static inline int cpu_has_vmx_invept_context(void)
 250 {
 251         return (!!(vmx_capability.ept & VMX_EPT_EXTENT_CONTEXT_BIT));
 252 }
 253
 254 static inline int cpu_has_vmx_invept_global(void)
 255 {
 256         return (!!(vmx_capability.ept & VMX_EPT_EXTENT_GLOBAL_BIT));
 257 }
 258
 259 static inline int cpu_has_vmx_ept(void)
 260 {
 261         return (vmcs_config.cpu_based_2nd_exec_ctrl &
 262                 SECONDARY_EXEC_ENABLE_EPT);
 263 }
 264
 265 static inline int vm_need_ept(void)
 266 {
 267         return (cpu_has_vmx_ept() && enable_ept);
 268 }
 269
 270 static inline int vm_need_virtualize_apic_accesses(struct kvm *kvm)
 271 {
 272         return ((cpu_has_vmx_virtualize_apic_accesses()) &&
 273                 (irqchip_in_kernel(kvm)));
 274 }
 275
 276 static inline int cpu_has_vmx_vpid(void)
 277 {
 278         return (vmcs_config.cpu_based_2nd_exec_ctrl &
 279                 SECONDARY_EXEC_ENABLE_VPID);
 280 }
 281
 282 static inline int cpu_has_virtual_nmis(void)
 283 {
 284         return vmcs_config.pin_based_exec_ctrl & PIN_BASED_VIRTUAL_NMIS;
 285 }
 286
 287 static int __find_msr_index(struct vcpu_vmx *vmx, u32 msr)
 288 {
 289         int i;
 290
 291         for (i = 0; i < vmx->nmsrs; ++i)
 292                 if (vmx->guest_msrs[i].index == msr)
 293                         return i;
 294         return -1;
 295 }
 296
 297 static inline void __invvpid(int ext, u16 vpid, gva_t gva)
 298 {
 299     struct {
 300         u64 vpid : 16;
 301         u64 rsvd : 48;
 302         u64 gva;
 303     } operand = { vpid, 0, gva };
 304
 305     asm volatile (__ex(ASM_VMX_INVVPID)
 306                   /* CF==1 or ZF==1 --> rc = -1 */
 307                   "; ja 1f ; ud2 ; 1:"
 308                   : : "a"(&operand), "c"(ext) : "cc", "memory");
 309 }
 310
 311 static inline void __invept(int ext, u64 eptp, gpa_t gpa)
 312 {
 313         struct {
 314                 u64 eptp, gpa;
 315         } operand = {eptp, gpa};
 316
 317         asm volatile (__ex(ASM_VMX_INVEPT)
 318                         /* CF==1 or ZF==1 --> rc = -1 */
 319                         "; ja 1f ; ud2 ; 1:\n"
 320                         : : "a" (&operand), "c" (ext) : "cc", "memory");
 321 }
 322
 323 static struct kvm_msr_entry *find_msr_entry(struct vcpu_vmx *vmx, u32 msr)
 324 {
 325         int i;
 326
 327         i = __find_msr_index(vmx, msr);
 328         if (i >= 0)
 329                 return &vmx->guest_msrs[i];
 330         return NULL;
 331 }
 332
 333 static void vmcs_clear(struct vmcs *vmcs)
 334 {
 335         u64 phys_addr = __pa(vmcs);
 336         u8 error;
 337
 338         asm volatile (__ex(ASM_VMX_VMCLEAR_RAX) "; setna %0"
 339                       : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
 340                       : "cc", "memory");
 341         if (error)
 342                 printk(KERN_ERR "kvm: vmclear fail: %p/%llx\n",
 343                        vmcs, phys_addr);
 344 }
 345
 346 static void __vcpu_clear(void *arg)
 347 {
 348         struct vcpu_vmx *vmx = arg;
 349         int cpu = raw_smp_processor_id();
 350
 351         if (vmx->vcpu.cpu == cpu)
 352                 vmcs_clear(vmx->vmcs);
 353         if (per_cpu(current_vmcs, cpu) == vmx->vmcs)
 354                 per_cpu(current_vmcs, cpu) = NULL;
 355         rdtscll(vmx->vcpu.arch.host_tsc);
 356         list_del(&vmx->local_vcpus_link);
 357         vmx->vcpu.cpu = -1;
 358         vmx->launched = 0;
 359 }
 360
 361 static void vcpu_clear(struct vcpu_vmx *vmx)
 362 {
 363         if (vmx->vcpu.cpu == -1)
 364                 return;
 365         smp_call_function_single(vmx->vcpu.cpu, __vcpu_clear, vmx, 1);
 366 }
 367
 368 static inline void vpid_sync_vcpu_all(struct vcpu_vmx *vmx)
 369 {
 370         if (vmx->vpid == 0)
 371                 return;
 372
 373         __invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vmx->vpid, 0);
 374 }
 375
 376 static inline void ept_sync_global(void)
 377 {
 378         if (cpu_has_vmx_invept_global())
 379                 __invept(VMX_EPT_EXTENT_GLOBAL, 0, 0);
 380 }
 381
 382 static inline void ept_sync_context(u64 eptp)
 383 {
 384         if (vm_need_ept()) {
 385                 if (cpu_has_vmx_invept_context())
 386                         __invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0);
 387                 else
 388                         ept_sync_global();
 389         }
 390 }
 391
 392 static inline void ept_sync_individual_addr(u64 eptp, gpa_t gpa)
 393 {
 394         if (vm_need_ept()) {
 395                 if (cpu_has_vmx_invept_individual_addr())
 396                         __invept(VMX_EPT_EXTENT_INDIVIDUAL_ADDR,
 397                                         eptp, gpa);
 398                 else
 399                         ept_sync_context(eptp);
 400         }
 401 }
 402
 403 static unsigned long vmcs_readl(unsigned long field)
 404 {
 405         unsigned long value;
 406
 407         asm volatile (__ex(ASM_VMX_VMREAD_RDX_RAX)
 408                       : "=a"(value) : "d"(field) : "cc");
 409         return value;
 410 }
 411
 412 static u16 vmcs_read16(unsigned long field)
 413 {
 414         return vmcs_readl(field);
 415 }
 416
 417 static u32 vmcs_read32(unsigned long field)
 418 {
 419         return vmcs_readl(field);
 420 }
 421
 422 static u64 vmcs_read64(unsigned long field)
 423 {
 424 #ifdef CONFIG_X86_64
 425         return vmcs_readl(field);
 426 #else
 427         return vmcs_readl(field) | ((u64)vmcs_readl(field+1) << 32);
 428 #endif
 429 }
 430
 431 static noinline void vmwrite_error(unsigned long field, unsigned long value)
 432 {
 433         printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n",
 434                field, value, vmcs_read32(VM_INSTRUCTION_ERROR));
 435         dump_stack();
 436 }
 437
 438 static void vmcs_writel(unsigned long field, unsigned long value)
 439 {
 440         u8 error;
 441
 442         asm volatile (__ex(ASM_VMX_VMWRITE_RAX_RDX) "; setna %0"
 443                        : "=q"(error) : "a"(value), "d"(field) : "cc");
 444         if (unlikely(error))
 445                 vmwrite_error(field, value);
 446 }
 447
 448 static void vmcs_write16(unsigned long field, u16 value)
 449 {
 450         vmcs_writel(field, value);
 451 }
 452
 453 static void vmcs_write32(unsigned long field, u32 value)
 454 {
 455         vmcs_writel(field, value);
 456 }
 457
 458 static void vmcs_write64(unsigned long field, u64 value)
 459 {
 460         vmcs_writel(field, value);
 461 #ifndef CONFIG_X86_64
 462         asm volatile ("");
 463         vmcs_writel(field+1, value >> 32);
 464 #endif
 465 }
 466
 467 static void vmcs_clear_bits(unsigned long field, u32 mask)
 468 {
 469         vmcs_writel(field, vmcs_readl(field) & ~mask);
 470 }
 471
 472 static void vmcs_set_bits(unsigned long field, u32 mask)
 473 {
 474         vmcs_writel(field, vmcs_readl(field) | mask);
 475 }
 476
 477 static void update_exception_bitmap(struct kvm_vcpu *vcpu)
 478 {
 479         u32 eb;
 480
 481         eb = (1u << PF_VECTOR) | (1u << UD_VECTOR);
 482         if (!vcpu->fpu_active)
 483                 eb |= 1u << NM_VECTOR;
 484         if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
 485                 if (vcpu->guest_debug &
 486                     (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
 487                         eb |= 1u << DB_VECTOR;
 488                 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
 489                         eb |= 1u << BP_VECTOR;
 490         }
 491         if (vcpu->arch.rmode.active)
 492                 eb = ~0;
 493         if (vm_need_ept())
 494                 eb &= ~(1u << PF_VECTOR); /* bypass_guest_pf = 0 */
 495         vmcs_write32(EXCEPTION_BITMAP, eb);
 496 }
 497
 498 static void reload_tss(void)
 499 {
 500         /*
 501          * VT restores TR but not its size.  Useless.
 502          */
 503         struct descriptor_table gdt;
 504         struct desc_struct *descs;
 505
 506         kvm_get_gdt(&gdt);
 507         descs = (void *)gdt.base;
 508         descs[GDT_ENTRY_TSS].type = 9; /* available TSS */
 509         load_TR_desc();
 510 }
 511
 512 static void load_transition_efer(struct vcpu_vmx *vmx)
 513 {
 514         int efer_offset = vmx->msr_offset_efer;
 515         u64 host_efer = vmx->host_msrs[efer_offset].data;
 516         u64 guest_efer = vmx->guest_msrs[efer_offset].data;
 517         u64 ignore_bits;
 518
 519         if (efer_offset < 0)
 520                 return;
 521         /*
 522          * NX is emulated; LMA and LME handled by hardware; SCE meaninless
 523          * outside long mode
 524          */
 525         ignore_bits = EFER_NX | EFER_SCE;
 526 #ifdef CONFIG_X86_64
 527         ignore_bits |= EFER_LMA | EFER_LME;
 528         /* SCE is meaningful only in long mode on Intel */
 529         if (guest_efer & EFER_LMA)
 530                 ignore_bits &= ~(u64)EFER_SCE;
 531 #endif
 532         if ((guest_efer & ~ignore_bits) == (host_efer & ~ignore_bits))
 533                 return;
 534
 535         vmx->host_state.guest_efer_loaded = 1;
 536         guest_efer &= ~ignore_bits;
 537         guest_efer |= host_efer & ignore_bits;
 538         wrmsrl(MSR_EFER, guest_efer);
 539         vmx->vcpu.stat.efer_reload++;
 540 }
 541
 542 static void reload_host_efer(struct vcpu_vmx *vmx)
 543 {
 544         if (vmx->host_state.guest_efer_loaded) {
 545                 vmx->host_state.guest_efer_loaded = 0;
 546                 load_msrs(vmx->host_msrs + vmx->msr_offset_efer, 1);
 547         }
 548 }
 549
 550 static void vmx_save_host_state(struct kvm_vcpu *vcpu)
 551 {
 552         struct vcpu_vmx *vmx = to_vmx(vcpu);
 553
 554         if (vmx->host_state.loaded)
 555                 return;
 556
 557         vmx->host_state.loaded = 1;
 558         /*
 559          * Set host fs and gs selectors.  Unfortunately, 22.2.3 does not
 560          * allow segment selectors with cpl > 0 or ti == 1.
 561          */
 562         vmx->host_state.ldt_sel = kvm_read_ldt();
 563         vmx->host_state.gs_ldt_reload_needed = vmx->host_state.ldt_sel;
 564         vmx->host_state.fs_sel = kvm_read_fs();
 565         if (!(vmx->host_state.fs_sel & 7)) {
 566                 vmcs_write16(HOST_FS_SELECTOR, vmx->host_state.fs_sel);
 567                 vmx->host_state.fs_reload_needed = 0;
 568         } else {
 569                 vmcs_write16(HOST_FS_SELECTOR, 0);
 570                 vmx->host_state.fs_reload_needed = 1;
 571         }
 572         vmx->host_state.gs_sel = kvm_read_gs();
 573         if (!(vmx->host_state.gs_sel & 7))
 574                 vmcs_write16(HOST_GS_SELECTOR, vmx->host_state.gs_sel);
 575         else {
 576                 vmcs_write16(HOST_GS_SELECTOR, 0);
 577                 vmx->host_state.gs_ldt_reload_needed = 1;
 578         }
 579
 580 #ifdef CONFIG_X86_64
 581         vmcs_writel(HOST_FS_BASE, read_msr(MSR_FS_BASE));
 582         vmcs_writel(HOST_GS_BASE, read_msr(MSR_GS_BASE));
 583 #else
 584         vmcs_writel(HOST_FS_BASE, segment_base(vmx->host_state.fs_sel));
 585         vmcs_writel(HOST_GS_BASE, segment_base(vmx->host_state.gs_sel));
 586 #endif
 587
 588 #ifdef CONFIG_X86_64
 589         if (is_long_mode(&vmx->vcpu))
 590                 save_msrs(vmx->host_msrs +
 591                           vmx->msr_offset_kernel_gs_base, 1);
 592
 593 #endif
 594         load_msrs(vmx->guest_msrs, vmx->save_nmsrs);
 595         load_transition_efer(vmx);
 596 }
 597
 598 static void __vmx_load_host_state(struct vcpu_vmx *vmx)
 599 {
 600         unsigned long flags;
 601
 602         if (!vmx->host_state.loaded)
 603                 return;
 604
 605         ++vmx->vcpu.stat.host_state_reload;
 606         vmx->host_state.loaded = 0;
 607         if (vmx->host_state.fs_reload_needed)
 608                 kvm_load_fs(vmx->host_state.fs_sel);
 609         if (vmx->host_state.gs_ldt_reload_needed) {
 610                 kvm_load_ldt(vmx->host_state.ldt_sel);
 611                 /*
 612                  * If we have to reload gs, we must take care to
 613                  * preserve our gs base.
 614                  */
 615                 local_irq_save(flags);
 616                 kvm_load_gs(vmx->host_state.gs_sel);
 617 #ifdef CONFIG_X86_64
 618                 wrmsrl(MSR_GS_BASE, vmcs_readl(HOST_GS_BASE));
 619 #endif
 620                 local_irq_restore(flags);
 621         }
 622         reload_tss();
 623         save_msrs(vmx->guest_msrs, vmx->save_nmsrs);
 624         load_msrs(vmx->host_msrs, vmx->save_nmsrs);
 625         reload_host_efer(vmx);
 626 }
 627
 628 static void vmx_load_host_state(struct vcpu_vmx *vmx)
 629 {
 630         preempt_disable();
 631         __vmx_load_host_state(vmx);
 632         preempt_enable();
 633 }
 634
 635 /*
 636  * Switches to specified vcpu, until a matching vcpu_put(), but assumes
 637  * vcpu mutex is already taken.
 638  */
 639 static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 640 {
 641         struct vcpu_vmx *vmx = to_vmx(vcpu);
 642         u64 phys_addr = __pa(vmx->vmcs);
 643         u64 tsc_this, delta, new_offset;
 644
 645         if (vcpu->cpu != cpu) {
 646                 vcpu_clear(vmx);
 647                 kvm_migrate_timers(vcpu);
 648                 vpid_sync_vcpu_all(vmx);
 649                 local_irq_disable();
 650                 list_add(&vmx->local_vcpus_link,
 651                          &per_cpu(vcpus_on_cpu, cpu));
 652                 local_irq_enable();
 653         }
 654
 655         if (per_cpu(current_vmcs, cpu) != vmx->vmcs) {
 656                 u8 error;
 657
 658                 per_cpu(current_vmcs, cpu) = vmx->vmcs;
 659                 asm volatile (__ex(ASM_VMX_VMPTRLD_RAX) "; setna %0"
 660                               : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
 661                               : "cc");
 662                 if (error)
 663                         printk(KERN_ERR "kvm: vmptrld %p/%llx fail\n",
 664                                vmx->vmcs, phys_addr);
 665         }
 666
 667         if (vcpu->cpu != cpu) {
 668                 struct descriptor_table dt;
 669                 unsigned long sysenter_esp;
 670
 671                 vcpu->cpu = cpu;
 672                 /*
 673                  * Linux uses per-cpu TSS and GDT, so set these when switching
 674                  * processors.
 675                  */
 676                 vmcs_writel(HOST_TR_BASE, kvm_read_tr_base()); /* 22.2.4 */
 677                 kvm_get_gdt(&dt);
 678                 vmcs_writel(HOST_GDTR_BASE, dt.base);   /* 22.2.4 */
 679
 680                 rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
 681                 vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */
 682
 683                 /*
 684                  * Make sure the time stamp counter is monotonous.
 685                  */
 686                 rdtscll(tsc_this);
 687                 if (tsc_this < vcpu->arch.host_tsc) {
 688                         delta = vcpu->arch.host_tsc - tsc_this;
 689                         new_offset = vmcs_read64(TSC_OFFSET) + delta;
 690                         vmcs_write64(TSC_OFFSET, new_offset);
 691                 }
 692         }
 693 }
 694
 695 static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
 696 {
 697         __vmx_load_host_state(to_vmx(vcpu));
 698 }
 699
 700 static void vmx_fpu_activate(struct kvm_vcpu *vcpu)
 701 {
 702         if (vcpu->fpu_active)
 703                 return;
 704         vcpu->fpu_active = 1;
 705         vmcs_clear_bits(GUEST_CR0, X86_CR0_TS);
 706         if (vcpu->arch.cr0 & X86_CR0_TS)
 707                 vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
 708         update_exception_bitmap(vcpu);
 709 }
 710
 711 static void vmx_fpu_deactivate(struct kvm_vcpu *vcpu)
 712 {
 713         if (!vcpu->fpu_active)
 714                 return;
 715         vcpu->fpu_active = 0;
 716         vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
 717         update_exception_bitmap(vcpu);
 718 }
 719
 720 static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu)
 721 {
 722         return vmcs_readl(GUEST_RFLAGS);
 723 }
 724
 725 static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
 726 {
 727         if (vcpu->arch.rmode.active)
 728                 rflags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
 729         vmcs_writel(GUEST_RFLAGS, rflags);
 730 }
 731
 732 static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
 733 {
 734         unsigned long rip;
 735         u32 interruptibility;
 736
 737         rip = kvm_rip_read(vcpu);
 738         rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
 739         kvm_rip_write(vcpu, rip);
 740
 741         /*
 742          * We emulated an instruction, so temporary interrupt blocking
 743          * should be removed, if set.
 744          */
 745         interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
 746         if (interruptibility & 3)
 747                 vmcs_write32(GUEST_INTERRUPTIBILITY_INFO,
 748                              interruptibility & ~3);
 749         vcpu->arch.interrupt_window_open = 1;
 750 }
 751
 752 static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
 753                                 bool has_error_code, u32 error_code)
 754 {
 755         struct vcpu_vmx *vmx = to_vmx(vcpu);
 756         u32 intr_info = nr | INTR_INFO_VALID_MASK;
 757
 758         if (has_error_code) {
 759                 vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code);
 760                 intr_info |= INTR_INFO_DELIVER_CODE_MASK;
 761         }
 762
 763         if (vcpu->arch.rmode.active) {
 764                 vmx->rmode.irq.pending = true;
 765                 vmx->rmode.irq.vector = nr;
 766                 vmx->rmode.irq.rip = kvm_rip_read(vcpu);
 767                 if (nr == BP_VECTOR || nr == OF_VECTOR)
 768                         vmx->rmode.irq.rip++;
 769                 intr_info |= INTR_TYPE_SOFT_INTR;
 770                 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info);
 771                 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
 772                 kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
 773                 return;
 774         }
 775
 776         if (nr == BP_VECTOR || nr == OF_VECTOR) {
 777                 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
 778                 intr_info |= INTR_TYPE_SOFT_EXCEPTION;
 779         } else
 780                 intr_info |= INTR_TYPE_HARD_EXCEPTION;
 781
 782         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info);
 783 }
 784
 785 static bool vmx_exception_injected(struct kvm_vcpu *vcpu)
 786 {
 787         return false;
 788 }
 789
 790 /*
 791  * Swap MSR entry in host/guest MSR entry array.
 792  */
 793 #ifdef CONFIG_X86_64
 794 static void move_msr_up(struct vcpu_vmx *vmx, int from, int to)
 795 {
 796         struct kvm_msr_entry tmp;
 797
 798         tmp = vmx->guest_msrs[to];
 799         vmx->guest_msrs[to] = vmx->guest_msrs[from];
 800         vmx->guest_msrs[from] = tmp;
 801         tmp = vmx->host_msrs[to];
 802         vmx->host_msrs[to] = vmx->host_msrs[from];
 803         vmx->host_msrs[from] = tmp;
 804 }
 805 #endif
 806
 807 /*
 808  * Set up the vmcs to automatically save and restore system
 809  * msrs.  Don't touch the 64-bit msrs if the guest is in legacy
 810  * mode, as fiddling with msrs is very expensive.
 811  */
 812 static void setup_msrs(struct vcpu_vmx *vmx)
 813 {
 814         int save_nmsrs;
 815
 816         vmx_load_host_state(vmx);
 817         save_nmsrs = 0;
 818 #ifdef CONFIG_X86_64
 819         if (is_long_mode(&vmx->vcpu)) {
 820                 int index;
 821
 822                 index = __find_msr_index(vmx, MSR_SYSCALL_MASK);
 823                 if (index >= 0)
 824                         move_msr_up(vmx, index, save_nmsrs++);
 825                 index = __find_msr_index(vmx, MSR_LSTAR);
 826                 if (index >= 0)
 827                         move_msr_up(vmx, index, save_nmsrs++);
 828                 index = __find_msr_index(vmx, MSR_CSTAR);
 829                 if (index >= 0)
 830                         move_msr_up(vmx, index, save_nmsrs++);
 831                 index = __find_msr_index(vmx, MSR_KERNEL_GS_BASE);
 832                 if (index >= 0)
 833                         move_msr_up(vmx, index, save_nmsrs++);
 834                 /*
 835                  * MSR_K6_STAR is only needed on long mode guests, and only
 836                  * if efer.sce is enabled.
 837                  */
 838                 index = __find_msr_index(vmx, MSR_K6_STAR);
 839                 if ((index >= 0) && (vmx->vcpu.arch.shadow_efer & EFER_SCE))
 840                         move_msr_up(vmx, index, save_nmsrs++);
 841         }
 842 #endif
 843         vmx->save_nmsrs = save_nmsrs;
 844
 845 #ifdef CONFIG_X86_64
 846         vmx->msr_offset_kernel_gs_base =
 847                 __find_msr_index(vmx, MSR_KERNEL_GS_BASE);
 848 #endif
 849         vmx->msr_offset_efer = __find_msr_index(vmx, MSR_EFER);
 850 }
 851
 852 /*
 853  * reads and returns guest's timestamp counter "register"
 854  * guest_tsc = host_tsc + tsc_offset    -- 21.3
 855  */
 856 static u64 guest_read_tsc(void)
 857 {
 858         u64 host_tsc, tsc_offset;
 859
 860         rdtscll(host_tsc);
 861         tsc_offset = vmcs_read64(TSC_OFFSET);
 862         return host_tsc + tsc_offset;
 863 }
 864
 865 /*
 866  * writes 'guest_tsc' into guest's timestamp counter "register"
 867  * guest_tsc = host_tsc + tsc_offset ==> tsc_offset = guest_tsc - host_tsc
 868  */
 869 static void guest_write_tsc(u64 guest_tsc, u64 host_tsc)
 870 {
 871         vmcs_write64(TSC_OFFSET, guest_tsc - host_tsc);
 872 }
 873
 874 /*
 875  * Reads an msr value (of 'msr_index') into 'pdata'.
 876  * Returns 0 on success, non-0 otherwise.
 877  * Assumes vcpu_load() was already called.
 878  */
 879 static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
 880 {
 881         u64 data;
 882         struct kvm_msr_entry *msr;
 883
 884         if (!pdata) {
 885                 printk(KERN_ERR "BUG: get_msr called with NULL pdata\n");
 886                 return -EINVAL;
 887         }
 888
 889         switch (msr_index) {
 890 #ifdef CONFIG_X86_64
 891         case MSR_FS_BASE:
 892                 data = vmcs_readl(GUEST_FS_BASE);
 893                 break;
 894         case MSR_GS_BASE:
 895                 data = vmcs_readl(GUEST_GS_BASE);
 896                 break;
 897         case MSR_EFER:
 898                 return kvm_get_msr_common(vcpu, msr_index, pdata);
 899 #endif
 900         case MSR_IA32_TIME_STAMP_COUNTER:
 901                 data = guest_read_tsc();
 902                 break;
 903         case MSR_IA32_SYSENTER_CS:
 904                 data = vmcs_read32(GUEST_SYSENTER_CS);
 905                 break;
 906         case MSR_IA32_SYSENTER_EIP:
 907                 data = vmcs_readl(GUEST_SYSENTER_EIP);
 908                 break;
 909         case MSR_IA32_SYSENTER_ESP:
 910                 data = vmcs_readl(GUEST_SYSENTER_ESP);
 911                 break;
 912         default:
 913                 vmx_load_host_state(to_vmx(vcpu));
 914                 msr = find_msr_entry(to_vmx(vcpu), msr_index);
 915                 if (msr) {
 916                         data = msr->data;
 917                         break;
 918                 }
 919                 return kvm_get_msr_common(vcpu, msr_index, pdata);
 920         }
 921
 922         *pdata = data;
 923         return 0;
 924 }
 925
 926 /*
 927  * Writes msr value into into the appropriate "register".
 928  * Returns 0 on success, non-0 otherwise.
 929  * Assumes vcpu_load() was already called.
 930  */
 931 static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
 932 {
 933         struct vcpu_vmx *vmx = to_vmx(vcpu);
 934         struct kvm_msr_entry *msr;
 935         u64 host_tsc;
 936         int ret = 0;
 937
 938         switch (msr_index) {
 939 #ifdef CONFIG_X86_64
 940         case MSR_EFER:
 941                 vmx_load_host_state(vmx);
 942                 ret = kvm_set_msr_common(vcpu, msr_index, data);
 943                 break;
 944         case MSR_FS_BASE:
 945                 vmcs_writel(GUEST_FS_BASE, data);
 946                 break;
 947         case MSR_GS_BASE:
 948                 vmcs_writel(GUEST_GS_BASE, data);
 949                 break;
 950 #endif
 951         case MSR_IA32_SYSENTER_CS:
 952                 vmcs_write32(GUEST_SYSENTER_CS, data);
 953                 break;
 954         case MSR_IA32_SYSENTER_EIP:
 955                 vmcs_writel(GUEST_SYSENTER_EIP, data);
 956                 break;
 957         case MSR_IA32_SYSENTER_ESP:
 958                 vmcs_writel(GUEST_SYSENTER_ESP, data);
 959                 break;
 960         case MSR_IA32_TIME_STAMP_COUNTER:
 961                 rdtscll(host_tsc);
 962                 guest_write_tsc(data, host_tsc);
 963                 break;
 964         case MSR_P6_PERFCTR0:
 965         case MSR_P6_PERFCTR1:
 966         case MSR_P6_EVNTSEL0:
 967         case MSR_P6_EVNTSEL1:
 968                 /*
 969                  * Just discard all writes to the performance counters; this
 970                  * should keep both older linux and windows 64-bit guests
 971                  * happy
 972                  */
 973                 pr_unimpl(vcpu, "unimplemented perfctr wrmsr: 0x%x data 0x%llx\n", msr_index, data);
 974
 975                 break;
 976         case MSR_IA32_CR_PAT:
 977                 if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
 978                         vmcs_write64(GUEST_IA32_PAT, data);
 979                         vcpu->arch.pat = data;
 980                         break;
 981                 }
 982                 /* Otherwise falls through to kvm_set_msr_common */
 983         default:
 984                 vmx_load_host_state(vmx);
 985                 msr = find_msr_entry(vmx, msr_index);
 986                 if (msr) {
 987                         msr->data = data;
 988                         break;
 989                 }
 990                 ret = kvm_set_msr_common(vcpu, msr_index, data);
 991         }
 992
 993         return ret;
 994 }
 995
 996 static void vmx_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
 997 {
 998         __set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);
 999         switch (reg) {
1000         case VCPU_REGS_RSP:
1001                 vcpu->arch.regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP);
1002                 break;
1003         case VCPU_REGS_RIP:
1004                 vcpu->arch.regs[VCPU_REGS_RIP] = vmcs_readl(GUEST_RIP);
1005                 break;
1006         default:
1007                 break;
1008         }
1009 }
1010
1011 static int set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg)
1012 {
1013         int old_debug = vcpu->guest_debug;
1014         unsigned long flags;
1015
1016         vcpu->guest_debug = dbg->control;
1017         if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE))
1018                 vcpu->guest_debug = 0;
1019
1020         if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
1021                 vmcs_writel(GUEST_DR7, dbg->arch.debugreg[7]);
1022         else
1023                 vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
1024
1025         flags = vmcs_readl(GUEST_RFLAGS);
1026         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
1027                 flags |= X86_EFLAGS_TF | X86_EFLAGS_RF;
1028         else if (old_debug & KVM_GUESTDBG_SINGLESTEP)
1029                 flags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1030         vmcs_writel(GUEST_RFLAGS, flags);
1031
1032         update_exception_bitmap(vcpu);
1033
1034         return 0;
1035 }
1036
1037 static int vmx_get_irq(struct kvm_vcpu *vcpu)
1038 {
1039         if (!vcpu->arch.interrupt.pending)
1040                 return -1;
1041         return vcpu->arch.interrupt.nr;
1042 }
1043
1044 static __init int cpu_has_kvm_support(void)
1045 {
1046         return cpu_has_vmx();
1047 }
1048
1049 static __init int vmx_disabled_by_bios(void)
1050 {
1051         u64 msr;
1052
1053         rdmsrl(MSR_IA32_FEATURE_CONTROL, msr);
1054         return (msr & (FEATURE_CONTROL_LOCKED |
1055                        FEATURE_CONTROL_VMXON_ENABLED))
1056             == FEATURE_CONTROL_LOCKED;
1057         /* locked but not enabled */
1058 }
1059
1060 static void hardware_enable(void *garbage)
1061 {
1062         int cpu = raw_smp_processor_id();
1063         u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
1064         u64 old;
1065
1066         INIT_LIST_HEAD(&per_cpu(vcpus_on_cpu, cpu));
1067         rdmsrl(MSR_IA32_FEATURE_CONTROL, old);
1068         if ((old & (FEATURE_CONTROL_LOCKED |
1069                     FEATURE_CONTROL_VMXON_ENABLED))
1070             != (FEATURE_CONTROL_LOCKED |
1071                 FEATURE_CONTROL_VMXON_ENABLED))
1072                 /* enable and lock */
1073                 wrmsrl(MSR_IA32_FEATURE_CONTROL, old |
1074                        FEATURE_CONTROL_LOCKED |
1075                        FEATURE_CONTROL_VMXON_ENABLED);
1076         write_cr4(read_cr4() | X86_CR4_VMXE); /* FIXME: not cpu hotplug safe */
1077         asm volatile (ASM_VMX_VMXON_RAX
1078                       : : "a"(&phys_addr), "m"(phys_addr)
1079                       : "memory", "cc");
1080 }
1081
1082 static void vmclear_local_vcpus(void)
1083 {
1084         int cpu = raw_smp_processor_id();
1085         struct vcpu_vmx *vmx, *n;
1086
1087         list_for_each_entry_safe(vmx, n, &per_cpu(vcpus_on_cpu, cpu),
1088                                  local_vcpus_link)
1089                 __vcpu_clear(vmx);
1090 }
1091
1092
1093 /* Just like cpu_vmxoff(), but with the __kvm_handle_fault_on_reboot()
1094  * tricks.
1095  */
1096 static void kvm_cpu_vmxoff(void)
1097 {
1098         asm volatile (__ex(ASM_VMX_VMXOFF) : : : "cc");
1099         write_cr4(read_cr4() & ~X86_CR4_VMXE);
1100 }
1101
1102 static void hardware_disable(void *garbage)
1103 {
1104         vmclear_local_vcpus();
1105         kvm_cpu_vmxoff();
1106 }
1107
1108 static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,
1109                                       u32 msr, u32 *result)
1110 {
1111         u32 vmx_msr_low, vmx_msr_high;
1112         u32 ctl = ctl_min | ctl_opt;
1113
1114         rdmsr(msr, vmx_msr_low, vmx_msr_high);
1115
1116         ctl &= vmx_msr_high; /* bit == 0 in high word ==> must be zero */
1117         ctl |= vmx_msr_low;  /* bit == 1 in low word  ==> must be one  */
1118
1119         /* Ensure minimum (required) set of control bits are supported. */
1120         if (ctl_min & ~ctl)
1121                 return -EIO;
1122
1123         *result = ctl;
1124         return 0;
1125 }
1126
1127 static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
1128 {
1129         u32 vmx_msr_low, vmx_msr_high;
1130         u32 min, opt, min2, opt2;
1131         u32 _pin_based_exec_control = 0;
1132         u32 _cpu_based_exec_control = 0;
1133         u32 _cpu_based_2nd_exec_control = 0;
1134         u32 _vmexit_control = 0;
1135         u32 _vmentry_control = 0;
1136
1137         min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING;
1138         opt = PIN_BASED_VIRTUAL_NMIS;
1139         if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS,
1140                                 &_pin_based_exec_control) < 0)
1141                 return -EIO;
1142
1143         min = CPU_BASED_HLT_EXITING |
1144 #ifdef CONFIG_X86_64
1145               CPU_BASED_CR8_LOAD_EXITING |
1146               CPU_BASED_CR8_STORE_EXITING |
1147 #endif
1148               CPU_BASED_CR3_LOAD_EXITING |
1149               CPU_BASED_CR3_STORE_EXITING |
1150               CPU_BASED_USE_IO_BITMAPS |
1151               CPU_BASED_MOV_DR_EXITING |
1152               CPU_BASED_USE_TSC_OFFSETING |
1153               CPU_BASED_INVLPG_EXITING;
1154         opt = CPU_BASED_TPR_SHADOW |
1155               CPU_BASED_USE_MSR_BITMAPS |
1156               CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
1157         if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
1158                                 &_cpu_based_exec_control) < 0)
1159                 return -EIO;
1160 #ifdef CONFIG_X86_64
1161         if ((_cpu_based_exec_control & CPU_BASED_TPR_SHADOW))
1162                 _cpu_based_exec_control &= ~CPU_BASED_CR8_LOAD_EXITING &
1163                                            ~CPU_BASED_CR8_STORE_EXITING;
1164 #endif
1165         if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) {
1166                 min2 = 0;
1167                 opt2 = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
1168                         SECONDARY_EXEC_WBINVD_EXITING |
1169                         SECONDARY_EXEC_ENABLE_VPID |
1170                         SECONDARY_EXEC_ENABLE_EPT;
1171                 if (adjust_vmx_controls(min2, opt2,
1172                                         MSR_IA32_VMX_PROCBASED_CTLS2,
1173                                         &_cpu_based_2nd_exec_control) < 0)
1174                         return -EIO;
1175         }
1176 #ifndef CONFIG_X86_64
1177         if (!(_cpu_based_2nd_exec_control &
1178                                 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES))
1179                 _cpu_based_exec_control &= ~CPU_BASED_TPR_SHADOW;
1180 #endif
1181         if (_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_EPT) {
1182                 /* CR3 accesses and invlpg don't need to cause VM Exits when EPT
1183                    enabled */
1184                 min &= ~(CPU_BASED_CR3_LOAD_EXITING |
1185                          CPU_BASED_CR3_STORE_EXITING |
1186                          CPU_BASED_INVLPG_EXITING);
1187                 if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
1188                                         &_cpu_based_exec_control) < 0)
1189                         return -EIO;
1190                 rdmsr(MSR_IA32_VMX_EPT_VPID_CAP,
1191                       vmx_capability.ept, vmx_capability.vpid);
1192         }
1193
1194         min = 0;
1195 #ifdef CONFIG_X86_64
1196         min |= VM_EXIT_HOST_ADDR_SPACE_SIZE;
1197 #endif
1198         opt = VM_EXIT_SAVE_IA32_PAT | VM_EXIT_LOAD_IA32_PAT;
1199         if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS,
1200                                 &_vmexit_control) < 0)
1201                 return -EIO;
1202
1203         min = 0;
1204         opt = VM_ENTRY_LOAD_IA32_PAT;
1205         if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS,
1206                                 &_vmentry_control) < 0)
1207                 return -EIO;
1208
1209         rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high);
1210
1211         /* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */
1212         if ((vmx_msr_high & 0x1fff) > PAGE_SIZE)
1213                 return -EIO;
1214
1215 #ifdef CONFIG_X86_64
1216         /* IA-32 SDM Vol 3B: 64-bit CPUs always have VMX_BASIC_MSR[48]==0. */
1217         if (vmx_msr_high & (1u<<16))
1218                 return -EIO;
1219 #endif
1220
1221         /* Require Write-Back (WB) memory type for VMCS accesses. */
1222         if (((vmx_msr_high >> 18) & 15) != 6)
1223                 return -EIO;
1224
1225         vmcs_conf->size = vmx_msr_high & 0x1fff;
1226         vmcs_conf->order = get_order(vmcs_config.size);
1227         vmcs_conf->revision_id = vmx_msr_low;
1228
1229         vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control;
1230         vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control;
1231         vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control;
1232         vmcs_conf->vmexit_ctrl         = _vmexit_control;
1233         vmcs_conf->vmentry_ctrl        = _vmentry_control;
1234
1235         return 0;
1236 }
1237
1238 static struct vmcs *alloc_vmcs_cpu(int cpu)
1239 {
1240         int node = cpu_to_node(cpu);
1241         struct page *pages;
1242         struct vmcs *vmcs;
1243
1244         pages = alloc_pages_node(node, GFP_KERNEL, vmcs_config.order);
1245         if (!pages)
1246                 return NULL;
1247         vmcs = page_address(pages);
1248         memset(vmcs, 0, vmcs_config.size);
1249         vmcs->revision_id = vmcs_config.revision_id; /* vmcs revision id */
1250         return vmcs;
1251 }
1252
1253 static struct vmcs *alloc_vmcs(void)
1254 {
1255         return alloc_vmcs_cpu(raw_smp_processor_id());
1256 }
1257
1258 static void free_vmcs(struct vmcs *vmcs)
1259 {
1260         free_pages((unsigned long)vmcs, vmcs_config.order);
1261 }
1262
1263 static void free_kvm_area(void)
1264 {
1265         int cpu;
1266
1267         for_each_online_cpu(cpu)
1268                 free_vmcs(per_cpu(vmxarea, cpu));
1269 }
1270
1271 static __init int alloc_kvm_area(void)
1272 {
1273         int cpu;
1274
1275         for_each_online_cpu(cpu) {
1276                 struct vmcs *vmcs;
1277
1278                 vmcs = alloc_vmcs_cpu(cpu);
1279                 if (!vmcs) {
1280                         free_kvm_area();
1281                         return -ENOMEM;
1282                 }
1283
1284                 per_cpu(vmxarea, cpu) = vmcs;
1285         }
1286         return 0;
1287 }
1288
1289 static __init int hardware_setup(void)
1290 {
1291         if (setup_vmcs_config(&vmcs_config) < 0)
1292                 return -EIO;
1293
1294         if (boot_cpu_has(X86_FEATURE_NX))
1295                 kvm_enable_efer_bits(EFER_NX);
1296
1297         return alloc_kvm_area();
1298 }
1299
1300 static __exit void hardware_unsetup(void)
1301 {
1302         free_kvm_area();
1303 }
1304
1305 static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save)
1306 {
1307         struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1308
1309         if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) {
1310                 vmcs_write16(sf->selector, save->selector);
1311                 vmcs_writel(sf->base, save->base);
1312                 vmcs_write32(sf->limit, save->limit);
1313                 vmcs_write32(sf->ar_bytes, save->ar);
1314         } else {
1315                 u32 dpl = (vmcs_read16(sf->selector) & SELECTOR_RPL_MASK)
1316                         << AR_DPL_SHIFT;
1317                 vmcs_write32(sf->ar_bytes, 0x93 | dpl);
1318         }
1319 }
1320
1321 static void enter_pmode(struct kvm_vcpu *vcpu)
1322 {
1323         unsigned long flags;
1324         struct vcpu_vmx *vmx = to_vmx(vcpu);
1325
1326         vmx->emulation_required = 1;
1327         vcpu->arch.rmode.active = 0;
1328
1329         vmcs_writel(GUEST_TR_BASE, vcpu->arch.rmode.tr.base);
1330         vmcs_write32(GUEST_TR_LIMIT, vcpu->arch.rmode.tr.limit);
1331         vmcs_write32(GUEST_TR_AR_BYTES, vcpu->arch.rmode.tr.ar);
1332
1333         flags = vmcs_readl(GUEST_RFLAGS);
1334         flags &= ~(X86_EFLAGS_IOPL | X86_EFLAGS_VM);
1335         flags |= (vcpu->arch.rmode.save_iopl << IOPL_SHIFT);
1336         vmcs_writel(GUEST_RFLAGS, flags);
1337
1338         vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~X86_CR4_VME) |
1339                         (vmcs_readl(CR4_READ_SHADOW) & X86_CR4_VME));
1340
1341         update_exception_bitmap(vcpu);
1342
1343         if (emulate_invalid_guest_state)
1344                 return;
1345
1346         fix_pmode_dataseg(VCPU_SREG_ES, &vcpu->arch.rmode.es);
1347         fix_pmode_dataseg(VCPU_SREG_DS, &vcpu->arch.rmode.ds);
1348         fix_pmode_dataseg(VCPU_SREG_GS, &vcpu->arch.rmode.gs);
1349         fix_pmode_dataseg(VCPU_SREG_FS, &vcpu->arch.rmode.fs);
1350
1351         vmcs_write16(GUEST_SS_SELECTOR, 0);
1352         vmcs_write32(GUEST_SS_AR_BYTES, 0x93);
1353
1354         vmcs_write16(GUEST_CS_SELECTOR,
1355                      vmcs_read16(GUEST_CS_SELECTOR) & ~SELECTOR_RPL_MASK);
1356         vmcs_write32(GUEST_CS_AR_BYTES, 0x9b);
1357 }
1358
1359 static gva_t rmode_tss_base(struct kvm *kvm)
1360 {
1361         if (!kvm->arch.tss_addr) {
1362                 gfn_t base_gfn = kvm->memslots[0].base_gfn +
1363                                  kvm->memslots[0].npages - 3;
1364                 return base_gfn << PAGE_SHIFT;
1365         }
1366         return kvm->arch.tss_addr;
1367 }
1368
1369 static void fix_rmode_seg(int seg, struct kvm_save_segment *save)
1370 {
1371         struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1372
1373         save->selector = vmcs_read16(sf->selector);
1374         save->base = vmcs_readl(sf->base);
1375         save->limit = vmcs_read32(sf->limit);
1376         save->ar = vmcs_read32(sf->ar_bytes);
1377         vmcs_write16(sf->selector, save->base >> 4);
1378         vmcs_write32(sf->base, save->base & 0xfffff);
1379         vmcs_write32(sf->limit, 0xffff);
1380         vmcs_write32(sf->ar_bytes, 0xf3);
1381 }
1382
1383 static void enter_rmode(struct kvm_vcpu *vcpu)
1384 {
1385         unsigned long flags;
1386         struct vcpu_vmx *vmx = to_vmx(vcpu);
1387
1388         vmx->emulation_required = 1;
1389         vcpu->arch.rmode.active = 1;
1390
1391         vcpu->arch.rmode.tr.base = vmcs_readl(GUEST_TR_BASE);
1392         vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm));
1393
1394         vcpu->arch.rmode.tr.limit = vmcs_read32(GUEST_TR_LIMIT);
1395         vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1);
1396
1397         vcpu->arch.rmode.tr.ar = vmcs_read32(GUEST_TR_AR_BYTES);
1398         vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
1399
1400         flags = vmcs_readl(GUEST_RFLAGS);
1401         vcpu->arch.rmode.save_iopl
1402                 = (flags & X86_EFLAGS_IOPL) >> IOPL_SHIFT;
1403
1404         flags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
1405
1406         vmcs_writel(GUEST_RFLAGS, flags);
1407         vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME);
1408         update_exception_bitmap(vcpu);
1409
1410         if (emulate_invalid_guest_state)
1411                 goto continue_rmode;
1412
1413         vmcs_write16(GUEST_SS_SELECTOR, vmcs_readl(GUEST_SS_BASE) >> 4);
1414         vmcs_write32(GUEST_SS_LIMIT, 0xffff);
1415         vmcs_write32(GUEST_SS_AR_BYTES, 0xf3);
1416
1417         vmcs_write32(GUEST_CS_AR_BYTES, 0xf3);
1418         vmcs_write32(GUEST_CS_LIMIT, 0xffff);
1419         if (vmcs_readl(GUEST_CS_BASE) == 0xffff0000)
1420                 vmcs_writel(GUEST_CS_BASE, 0xf0000);
1421         vmcs_write16(GUEST_CS_SELECTOR, vmcs_readl(GUEST_CS_BASE) >> 4);
1422
1423         fix_rmode_seg(VCPU_SREG_ES, &vcpu->arch.rmode.es);
1424         fix_rmode_seg(VCPU_SREG_DS, &vcpu->arch.rmode.ds);
1425         fix_rmode_seg(VCPU_SREG_GS, &vcpu->arch.rmode.gs);
1426         fix_rmode_seg(VCPU_SREG_FS, &vcpu->arch.rmode.fs);
1427
1428 continue_rmode:
1429         kvm_mmu_reset_context(vcpu);
1430         init_rmode(vcpu->kvm);
1431 }
1432
1433 #ifdef CONFIG_X86_64
1434
1435 static void enter_lmode(struct kvm_vcpu *vcpu)
1436 {
1437         u32 guest_tr_ar;
1438
1439         guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES);
1440         if ((guest_tr_ar & AR_TYPE_MASK) != AR_TYPE_BUSY_64_TSS) {
1441                 printk(KERN_DEBUG "%s: tss fixup for long mode. \n",
1442                        __func__);
1443                 vmcs_write32(GUEST_TR_AR_BYTES,
1444                              (guest_tr_ar & ~AR_TYPE_MASK)
1445                              | AR_TYPE_BUSY_64_TSS);
1446         }
1447
1448         vcpu->arch.shadow_efer |= EFER_LMA;
1449
1450         find_msr_entry(to_vmx(vcpu), MSR_EFER)->data |= EFER_LMA | EFER_LME;
1451         vmcs_write32(VM_ENTRY_CONTROLS,
1452                      vmcs_read32(VM_ENTRY_CONTROLS)
1453                      | VM_ENTRY_IA32E_MODE);
1454 }
1455
1456 static void exit_lmode(struct kvm_vcpu *vcpu)
1457 {
1458         vcpu->arch.shadow_efer &= ~EFER_LMA;
1459
1460         vmcs_write32(VM_ENTRY_CONTROLS,
1461                      vmcs_read32(VM_ENTRY_CONTROLS)
1462                      & ~VM_ENTRY_IA32E_MODE);
1463 }
1464
1465 #endif
1466
1467 static void vmx_flush_tlb(struct kvm_vcpu *vcpu)
1468 {
1469         vpid_sync_vcpu_all(to_vmx(vcpu));
1470         if (vm_need_ept())
1471                 ept_sync_context(construct_eptp(vcpu->arch.mmu.root_hpa));
1472 }
1473
1474 static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
1475 {
1476         vcpu->arch.cr4 &= KVM_GUEST_CR4_MASK;
1477         vcpu->arch.cr4 |= vmcs_readl(GUEST_CR4) & ~KVM_GUEST_CR4_MASK;
1478 }
1479
1480 static void ept_load_pdptrs(struct kvm_vcpu *vcpu)
1481 {
1482         if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
1483                 if (!load_pdptrs(vcpu, vcpu->arch.cr3)) {
1484                         printk(KERN_ERR "EPT: Fail to load pdptrs!\n");
1485                         return;
1486                 }
1487                 vmcs_write64(GUEST_PDPTR0, vcpu->arch.pdptrs[0]);
1488                 vmcs_write64(GUEST_PDPTR1, vcpu->arch.pdptrs[1]);
1489                 vmcs_write64(GUEST_PDPTR2, vcpu->arch.pdptrs[2]);
1490                 vmcs_write64(GUEST_PDPTR3, vcpu->arch.pdptrs[3]);
1491         }
1492 }
1493
1494 static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
1495
1496 static void ept_update_paging_mode_cr0(unsigned long *hw_cr0,
1497                                         unsigned long cr0,
1498                                         struct kvm_vcpu *vcpu)
1499 {
1500         if (!(cr0 & X86_CR0_PG)) {
1501                 /* From paging/starting to nonpaging */
1502                 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
1503                              vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) |
1504                              (CPU_BASED_CR3_LOAD_EXITING |
1505                               CPU_BASED_CR3_STORE_EXITING));
1506                 vcpu->arch.cr0 = cr0;
1507                 vmx_set_cr4(vcpu, vcpu->arch.cr4);
1508                 *hw_cr0 |= X86_CR0_PE | X86_CR0_PG;
1509                 *hw_cr0 &= ~X86_CR0_WP;
1510         } else if (!is_paging(vcpu)) {
1511                 /* From nonpaging to paging */
1512                 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
1513                              vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) &
1514                              ~(CPU_BASED_CR3_LOAD_EXITING |
1515                                CPU_BASED_CR3_STORE_EXITING));
1516                 vcpu->arch.cr0 = cr0;
1517                 vmx_set_cr4(vcpu, vcpu->arch.cr4);
1518                 if (!(vcpu->arch.cr0 & X86_CR0_WP))
1519                         *hw_cr0 &= ~X86_CR0_WP;
1520         }
1521 }
1522
1523 static void ept_update_paging_mode_cr4(unsigned long *hw_cr4,
1524                                         struct kvm_vcpu *vcpu)
1525 {
1526         if (!is_paging(vcpu)) {
1527                 *hw_cr4 &= ~X86_CR4_PAE;
1528                 *hw_cr4 |= X86_CR4_PSE;
1529         } else if (!(vcpu->arch.cr4 & X86_CR4_PAE))
1530                 *hw_cr4 &= ~X86_CR4_PAE;
1531 }
1532
1533 static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
1534 {
1535         unsigned long hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK) |
1536                                 KVM_VM_CR0_ALWAYS_ON;
1537
1538         vmx_fpu_deactivate(vcpu);
1539
1540         if (vcpu->arch.rmode.active && (cr0 & X86_CR0_PE))
1541                 enter_pmode(vcpu);
1542
1543         if (!vcpu->arch.rmode.active && !(cr0 & X86_CR0_PE))
1544                 enter_rmode(vcpu);
1545
1546 #ifdef CONFIG_X86_64
1547         if (vcpu->arch.shadow_efer & EFER_LME) {
1548                 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG))
1549                         enter_lmode(vcpu);
1550                 if (is_paging(vcpu) && !(cr0 & X86_CR0_PG))
1551                         exit_lmode(vcpu);
1552         }
1553 #endif
1554
1555         if (vm_need_ept())
1556                 ept_update_paging_mode_cr0(&hw_cr0, cr0, vcpu);
1557
1558         vmcs_writel(CR0_READ_SHADOW, cr0);
1559         vmcs_writel(GUEST_CR0, hw_cr0);
1560         vcpu->arch.cr0 = cr0;
1561
1562         if (!(cr0 & X86_CR0_TS) || !(cr0 & X86_CR0_PE))
1563                 vmx_fpu_activate(vcpu);
1564 }
1565
1566 static u64 construct_eptp(unsigned long root_hpa)
1567 {
1568         u64 eptp;
1569
1570         /* TODO write the value reading from MSR */
1571         eptp = VMX_EPT_DEFAULT_MT |
1572                 VMX_EPT_DEFAULT_GAW << VMX_EPT_GAW_EPTP_SHIFT;
1573         eptp |= (root_hpa & PAGE_MASK);
1574
1575         return eptp;
1576 }
1577
1578 static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
1579 {
1580         unsigned long guest_cr3;
1581         u64 eptp;
1582
1583         guest_cr3 = cr3;
1584         if (vm_need_ept()) {
1585                 eptp = construct_eptp(cr3);
1586                 vmcs_write64(EPT_POINTER, eptp);
1587                 ept_sync_context(eptp);
1588                 ept_load_pdptrs(vcpu);
1589                 guest_cr3 = is_paging(vcpu) ? vcpu->arch.cr3 :
1590                         VMX_EPT_IDENTITY_PAGETABLE_ADDR;
1591         }
1592
1593         vmx_flush_tlb(vcpu);
1594         vmcs_writel(GUEST_CR3, guest_cr3);
1595         if (vcpu->arch.cr0 & X86_CR0_PE)
1596                 vmx_fpu_deactivate(vcpu);
1597 }
1598
1599 static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
1600 {
1601         unsigned long hw_cr4 = cr4 | (vcpu->arch.rmode.active ?
1602                     KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON);
1603
1604         vcpu->arch.cr4 = cr4;
1605         if (vm_need_ept())
1606                 ept_update_paging_mode_cr4(&hw_cr4, vcpu);
1607
1608         vmcs_writel(CR4_READ_SHADOW, cr4);
1609         vmcs_writel(GUEST_CR4, hw_cr4);
1610 }
1611
1612 static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer)
1613 {
1614         struct vcpu_vmx *vmx = to_vmx(vcpu);
1615         struct kvm_msr_entry *msr = find_msr_entry(vmx, MSR_EFER);
1616
1617         vcpu->arch.shadow_efer = efer;
1618         if (!msr)
1619                 return;
1620         if (efer & EFER_LMA) {
1621                 vmcs_write32(VM_ENTRY_CONTROLS,
1622                                      vmcs_read32(VM_ENTRY_CONTROLS) |
1623                                      VM_ENTRY_IA32E_MODE);
1624                 msr->data = efer;
1625
1626         } else {
1627                 vmcs_write32(VM_ENTRY_CONTROLS,
1628                                      vmcs_read32(VM_ENTRY_CONTROLS) &
1629                                      ~VM_ENTRY_IA32E_MODE);
1630
1631                 msr->data = efer & ~EFER_LME;
1632         }
1633         setup_msrs(vmx);
1634 }
1635
1636 static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg)
1637 {
1638         struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1639
1640         return vmcs_readl(sf->base);
1641 }
1642
1643 static void vmx_get_segment(struct kvm_vcpu *vcpu,
1644                             struct kvm_segment *var, int seg)
1645 {
1646         struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1647         u32 ar;
1648
1649         var->base = vmcs_readl(sf->base);
1650         var->limit = vmcs_read32(sf->limit);
1651         var->selector = vmcs_read16(sf->selector);
1652         ar = vmcs_read32(sf->ar_bytes);
1653         if ((ar & AR_UNUSABLE_MASK) && !emulate_invalid_guest_state)
1654                 ar = 0;
1655         var->type = ar & 15;
1656         var->s = (ar >> 4) & 1;
1657         var->dpl = (ar >> 5) & 3;
1658         var->present = (ar >> 7) & 1;
1659         var->avl = (ar >> 12) & 1;
1660         var->l = (ar >> 13) & 1;
1661         var->db = (ar >> 14) & 1;
1662         var->g = (ar >> 15) & 1;
1663         var->unusable = (ar >> 16) & 1;
1664 }
1665
1666 static int vmx_get_cpl(struct kvm_vcpu *vcpu)
1667 {
1668         struct kvm_segment kvm_seg;
1669
1670         if (!(vcpu->arch.cr0 & X86_CR0_PE)) /* if real mode */
1671                 return 0;
1672
1673         if (vmx_get_rflags(vcpu) & X86_EFLAGS_VM) /* if virtual 8086 */
1674                 return 3;
1675
1676         vmx_get_segment(vcpu, &kvm_seg, VCPU_SREG_CS);
1677         return kvm_seg.selector & 3;
1678 }
1679
1680 static u32 vmx_segment_access_rights(struct kvm_segment *var)
1681 {
1682         u32 ar;
1683
1684         if (var->unusable)
1685                 ar = 1 << 16;
1686         else {
1687                 ar = var->type & 15;
1688                 ar |= (var->s & 1) << 4;
1689                 ar |= (var->dpl & 3) << 5;
1690                 ar |= (var->present & 1) << 7;
1691                 ar |= (var->avl & 1) << 12;
1692                 ar |= (var->l & 1) << 13;
1693                 ar |= (var->db & 1) << 14;
1694                 ar |= (var->g & 1) << 15;
1695         }
1696         if (ar == 0) /* a 0 value means unusable */
1697                 ar = AR_UNUSABLE_MASK;
1698
1699         return ar;
1700 }
1701
1702 static void vmx_set_segment(struct kvm_vcpu *vcpu,
1703                             struct kvm_segment *var, int seg)
1704 {
1705         struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
1706         u32 ar;
1707
1708         if (vcpu->arch.rmode.active && seg == VCPU_SREG_TR) {
1709                 vcpu->arch.rmode.tr.selector = var->selector;
1710                 vcpu->arch.rmode.tr.base = var->base;
1711                 vcpu->arch.rmode.tr.limit = var->limit;
1712                 vcpu->arch.rmode.tr.ar = vmx_segment_access_rights(var);
1713                 return;
1714         }
1715         vmcs_writel(sf->base, var->base);
1716         vmcs_write32(sf->limit, var->limit);
1717         vmcs_write16(sf->selector, var->selector);
1718         if (vcpu->arch.rmode.active && var->s) {
1719                 /*
1720                  * Hack real-mode segments into vm86 compatibility.
1721                  */
1722                 if (var->base == 0xffff0000 && var->selector == 0xf000)
1723                         vmcs_writel(sf->base, 0xf0000);
1724                 ar = 0xf3;
1725         } else
1726                 ar = vmx_segment_access_rights(var);
1727         vmcs_write32(sf->ar_bytes, ar);
1728 }
1729
1730 static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
1731 {
1732         u32 ar = vmcs_read32(GUEST_CS_AR_BYTES);
1733
1734         *db = (ar >> 14) & 1;
1735         *l = (ar >> 13) & 1;
1736 }
1737
1738 static void vmx_get_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
1739 {
1740         dt->limit = vmcs_read32(GUEST_IDTR_LIMIT);
1741         dt->base = vmcs_readl(GUEST_IDTR_BASE);
1742 }
1743
1744 static void vmx_set_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
1745 {
1746         vmcs_write32(GUEST_IDTR_LIMIT, dt->limit);
1747         vmcs_writel(GUEST_IDTR_BASE, dt->base);
1748 }
1749
1750 static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
1751 {
1752         dt->limit = vmcs_read32(GUEST_GDTR_LIMIT);
1753         dt->base = vmcs_readl(GUEST_GDTR_BASE);
1754 }
1755
1756 static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
1757 {
1758         vmcs_write32(GUEST_GDTR_LIMIT, dt->limit);
1759         vmcs_writel(GUEST_GDTR_BASE, dt->base);
1760 }
1761
1762 static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg)
1763 {
1764         struct kvm_segment var;
1765         u32 ar;
1766
1767         vmx_get_segment(vcpu, &var, seg);
1768         ar = vmx_segment_access_rights(&var);
1769
1770         if (var.base != (var.selector << 4))
1771                 return false;
1772         if (var.limit != 0xffff)
1773                 return false;
1774         if (ar != 0xf3)
1775                 return false;
1776
1777         return true;
1778 }
1779
1780 static bool code_segment_valid(struct kvm_vcpu *vcpu)
1781 {
1782         struct kvm_segment cs;
1783         unsigned int cs_rpl;
1784
1785         vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
1786         cs_rpl = cs.selector & SELECTOR_RPL_MASK;
1787
1788         if (cs.unusable)
1789                 return false;
1790         if (~cs.type & (AR_TYPE_CODE_MASK|AR_TYPE_ACCESSES_MASK))
1791                 return false;
1792         if (!cs.s)
1793                 return false;
1794         if (cs.type & AR_TYPE_WRITEABLE_MASK) {
1795                 if (cs.dpl > cs_rpl)
1796                         return false;
1797         } else {
1798                 if (cs.dpl != cs_rpl)
1799                         return false;
1800         }
1801         if (!cs.present)
1802                 return false;
1803
1804         /* TODO: Add Reserved field check, this'll require a new member in the kvm_segment_field structure */
1805         return true;
1806 }
1807
1808 static bool stack_segment_valid(struct kvm_vcpu *vcpu)
1809 {
1810         struct kvm_segment ss;
1811         unsigned int ss_rpl;
1812
1813         vmx_get_segment(vcpu, &ss, VCPU_SREG_SS);
1814         ss_rpl = ss.selector & SELECTOR_RPL_MASK;
1815
1816         if (ss.unusable)
1817                 return true;
1818         if (ss.type != 3 && ss.type != 7)
1819                 return false;
1820         if (!ss.s)
1821                 return false;
1822         if (ss.dpl != ss_rpl) /* DPL != RPL */
1823                 return false;
1824         if (!ss.present)
1825                 return false;
1826
1827         return true;
1828 }
1829
1830 static bool data_segment_valid(struct kvm_vcpu *vcpu, int seg)
1831 {
1832         struct kvm_segment var;
1833         unsigned int rpl;
1834
1835         vmx_get_segment(vcpu, &var, seg);
1836         rpl = var.selector & SELECTOR_RPL_MASK;
1837
1838         if (var.unusable)
1839                 return true;
1840         if (!var.s)
1841                 return false;
1842         if (!var.present)
1843                 return false;
1844         if (~var.type & (AR_TYPE_CODE_MASK|AR_TYPE_WRITEABLE_MASK)) {
1845                 if (var.dpl < rpl) /* DPL < RPL */
1846                         return false;
1847         }
1848
1849         /* TODO: Add other members to kvm_segment_field to allow checking for other access
1850          * rights flags
1851          */
1852         return true;
1853 }
1854
1855 static bool tr_valid(struct kvm_vcpu *vcpu)
1856 {
1857         struct kvm_segment tr;
1858
1859         vmx_get_segment(vcpu, &tr, VCPU_SREG_TR);
1860
1861         if (tr.unusable)
1862                 return false;
1863         if (tr.selector & SELECTOR_TI_MASK)     /* TI = 1 */
1864                 return false;
1865         if (tr.type != 3 && tr.type != 11) /* TODO: Check if guest is in IA32e mode */
1866                 return false;
1867         if (!tr.present)
1868                 return false;
1869
1870         return true;
1871 }
1872
1873 static bool ldtr_valid(struct kvm_vcpu *vcpu)
1874 {
1875         struct kvm_segment ldtr;
1876
1877         vmx_get_segment(vcpu, &ldtr, VCPU_SREG_LDTR);
1878
1879         if (ldtr.unusable)
1880                 return true;
1881         if (ldtr.selector & SELECTOR_TI_MASK)   /* TI = 1 */
1882                 return false;
1883         if (ldtr.type != 2)
1884                 return false;
1885         if (!ldtr.present)
1886                 return false;
1887
1888         return true;
1889 }
1890
1891 static bool cs_ss_rpl_check(struct kvm_vcpu *vcpu)
1892 {
1893         struct kvm_segment cs, ss;
1894
1895         vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
1896         vmx_get_segment(vcpu, &ss, VCPU_SREG_SS);
1897
1898         return ((cs.selector & SELECTOR_RPL_MASK) ==
1899                  (ss.selector & SELECTOR_RPL_MASK));
1900 }
1901
1902 /*
1903  * Check if guest state is valid. Returns true if valid, false if
1904  * not.
1905  * We assume that registers are always usable
1906  */
1907 static bool guest_state_valid(struct kvm_vcpu *vcpu)
1908 {
1909         /* real mode guest state checks */
1910         if (!(vcpu->arch.cr0 & X86_CR0_PE)) {
1911                 if (!rmode_segment_valid(vcpu, VCPU_SREG_CS))
1912                         return false;
1913                 if (!rmode_segment_valid(vcpu, VCPU_SREG_SS))
1914                         return false;
1915                 if (!rmode_segment_valid(vcpu, VCPU_SREG_DS))
1916                         return false;
1917                 if (!rmode_segment_valid(vcpu, VCPU_SREG_ES))
1918                         return false;
1919                 if (!rmode_segment_valid(vcpu, VCPU_SREG_FS))
1920                         return false;
1921                 if (!rmode_segment_valid(vcpu, VCPU_SREG_GS))
1922                         return false;
1923         } else {
1924         /* protected mode guest state checks */
1925                 if (!cs_ss_rpl_check(vcpu))
1926                         return false;
1927                 if (!code_segment_valid(vcpu))
1928                         return false;
1929                 if (!stack_segment_valid(vcpu))
1930                         return false;
1931                 if (!data_segment_valid(vcpu, VCPU_SREG_DS))
1932                         return false;
1933                 if (!data_segment_valid(vcpu, VCPU_SREG_ES))
1934                         return false;
1935                 if (!data_segment_valid(vcpu, VCPU_SREG_FS))
1936                         return false;
1937                 if (!data_segment_valid(vcpu, VCPU_SREG_GS))
1938                         return false;
1939                 if (!tr_valid(vcpu))
1940                         return false;
1941                 if (!ldtr_valid(vcpu))
1942                         return false;
1943         }
1944         /* TODO:
1945          * - Add checks on RIP
1946          * - Add checks on RFLAGS
1947          */
1948
1949         return true;
1950 }
1951
1952 static int init_rmode_tss(struct kvm *kvm)
1953 {
1954         gfn_t fn = rmode_tss_base(kvm) >> PAGE_SHIFT;
1955         u16 data = 0;
1956         int ret = 0;
1957         int r;
1958
1959         r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
1960         if (r < 0)
1961                 goto out;
1962         data = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE;
1963         r = kvm_write_guest_page(kvm, fn++, &data,
1964                         TSS_IOPB_BASE_OFFSET, sizeof(u16));
1965         if (r < 0)
1966                 goto out;
1967         r = kvm_clear_guest_page(kvm, fn++, 0, PAGE_SIZE);
1968         if (r < 0)
1969                 goto out;
1970         r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
1971         if (r < 0)
1972                 goto out;
1973         data = ~0;
1974         r = kvm_write_guest_page(kvm, fn, &data,
1975                                  RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1,
1976                                  sizeof(u8));
1977         if (r < 0)
1978                 goto out;
1979
1980         ret = 1;
1981 out:
1982         return ret;
1983 }
1984
1985 static int init_rmode_identity_map(struct kvm *kvm)
1986 {
1987         int i, r, ret;
1988         pfn_t identity_map_pfn;
1989         u32 tmp;
1990
1991         if (!vm_need_ept())
1992                 return 1;
1993         if (unlikely(!kvm->arch.ept_identity_pagetable)) {
1994                 printk(KERN_ERR "EPT: identity-mapping pagetable "
1995                         "haven't been allocated!\n");
1996                 return 0;
1997         }
1998         if (likely(kvm->arch.ept_identity_pagetable_done))
1999                 return 1;
2000         ret = 0;
2001         identity_map_pfn = VMX_EPT_IDENTITY_PAGETABLE_ADDR >> PAGE_SHIFT;
2002         r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE);
2003         if (r < 0)
2004                 goto out;
2005         /* Set up identity-mapping pagetable for EPT in real mode */
2006         for (i = 0; i < PT32_ENT_PER_PAGE; i++) {
2007                 tmp = (i << 22) + (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |
2008                         _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE);
2009                 r = kvm_write_guest_page(kvm, identity_map_pfn,
2010                                 &tmp, i * sizeof(tmp), sizeof(tmp));
2011                 if (r < 0)
2012                         goto out;
2013         }
2014         kvm->arch.ept_identity_pagetable_done = true;
2015         ret = 1;
2016 out:
2017         return ret;
2018 }
2019
2020 static void seg_setup(int seg)
2021 {
2022         struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
2023
2024         vmcs_write16(sf->selector, 0);
2025         vmcs_writel(sf->base, 0);
2026         vmcs_write32(sf->limit, 0xffff);
2027         vmcs_write32(sf->ar_bytes, 0xf3);
2028 }
2029
2030 static int alloc_apic_access_page(struct kvm *kvm)
2031 {
2032         struct kvm_userspace_memory_region kvm_userspace_mem;
2033         int r = 0;
2034
2035         down_write(&kvm->slots_lock);
2036         if (kvm->arch.apic_access_page)
2037                 goto out;
2038         kvm_userspace_mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;
2039         kvm_userspace_mem.flags = 0;
2040         kvm_userspace_mem.guest_phys_addr = 0xfee00000ULL;
2041         kvm_userspace_mem.memory_size = PAGE_SIZE;
2042         r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
2043         if (r)
2044                 goto out;
2045
2046         kvm->arch.apic_access_page = gfn_to_page(kvm, 0xfee00);
2047 out:
2048         up_write(&kvm->slots_lock);
2049         return r;
2050 }
2051
2052 static int alloc_identity_pagetable(struct kvm *kvm)
2053 {
2054         struct kvm_userspace_memory_region kvm_userspace_mem;
2055         int r = 0;
2056
2057         down_write(&kvm->slots_lock);
2058         if (kvm->arch.ept_identity_pagetable)
2059                 goto out;
2060         kvm_userspace_mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT;
2061         kvm_userspace_mem.flags = 0;
2062         kvm_userspace_mem.guest_phys_addr = VMX_EPT_IDENTITY_PAGETABLE_ADDR;
2063         kvm_userspace_mem.memory_size = PAGE_SIZE;
2064         r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
2065         if (r)
2066                 goto out;
2067
2068         kvm->arch.ept_identity_pagetable = gfn_to_page(kvm,
2069                         VMX_EPT_IDENTITY_PAGETABLE_ADDR >> PAGE_SHIFT);
2070 out:
2071         up_write(&kvm->slots_lock);
2072         return r;
2073 }
2074
2075 static void allocate_vpid(struct vcpu_vmx *vmx)
2076 {
2077         int vpid;
2078
2079         vmx->vpid = 0;
2080         if (!enable_vpid || !cpu_has_vmx_vpid())
2081                 return;
2082         spin_lock(&vmx_vpid_lock);
2083         vpid = find_first_zero_bit(vmx_vpid_bitmap, VMX_NR_VPIDS);
2084         if (vpid < VMX_NR_VPIDS) {
2085                 vmx->vpid = vpid;
2086                 __set_bit(vpid, vmx_vpid_bitmap);
2087         }
2088         spin_unlock(&vmx_vpid_lock);
2089 }
2090
2091 static void vmx_disable_intercept_for_msr(struct page *msr_bitmap, u32 msr)
2092 {
2093         void *va;
2094
2095         if (!cpu_has_vmx_msr_bitmap())
2096                 return;
2097
2098         /*
2099          * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals
2100          * have the write-low and read-high bitmap offsets the wrong way round.
2101          * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff.
2102          */
2103         va = kmap(msr_bitmap);
2104         if (msr <= 0x1fff) {
2105                 __clear_bit(msr, va + 0x000); /* read-low */
2106                 __clear_bit(msr, va + 0x800); /* write-low */
2107         } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) {
2108                 msr &= 0x1fff;
2109                 __clear_bit(msr, va + 0x400); /* read-high */
2110                 __clear_bit(msr, va + 0xc00); /* write-high */
2111         }
2112         kunmap(msr_bitmap);
2113 }
2114
2115 /*
2116  * Sets up the vmcs for emulated real mode.
2117  */
2118 static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
2119 {
2120         u32 host_sysenter_cs, msr_low, msr_high;
2121         u32 junk;
2122         u64 host_pat, tsc_this, tsc_base;
2123         unsigned long a;
2124         struct descriptor_table dt;
2125         int i;
2126         unsigned long kvm_vmx_return;
2127         u32 exec_control;
2128
2129         /* I/O */
2130         vmcs_write64(IO_BITMAP_A, page_to_phys(vmx_io_bitmap_a));
2131         vmcs_write64(IO_BITMAP_B, page_to_phys(vmx_io_bitmap_b));
2132
2133         if (cpu_has_vmx_msr_bitmap())
2134                 vmcs_write64(MSR_BITMAP, page_to_phys(vmx_msr_bitmap));
2135
2136         vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */
2137
2138         /* Control */
2139         vmcs_write32(PIN_BASED_VM_EXEC_CONTROL,
2140                 vmcs_config.pin_based_exec_ctrl);
2141
2142         exec_control = vmcs_config.cpu_based_exec_ctrl;
2143         if (!vm_need_tpr_shadow(vmx->vcpu.kvm)) {
2144                 exec_control &= ~CPU_BASED_TPR_SHADOW;
2145 #ifdef CONFIG_X86_64
2146                 exec_control |= CPU_BASED_CR8_STORE_EXITING |
2147                                 CPU_BASED_CR8_LOAD_EXITING;
2148 #endif
2149         }
2150         if (!vm_need_ept())
2151                 exec_control |= CPU_BASED_CR3_STORE_EXITING |
2152                                 CPU_BASED_CR3_LOAD_EXITING  |
2153                                 CPU_BASED_INVLPG_EXITING;
2154         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, exec_control);
2155
2156         if (cpu_has_secondary_exec_ctrls()) {
2157                 exec_control = vmcs_config.cpu_based_2nd_exec_ctrl;
2158                 if (!vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
2159                         exec_control &=
2160                                 ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
2161                 if (vmx->vpid == 0)
2162                         exec_control &= ~SECONDARY_EXEC_ENABLE_VPID;
2163                 if (!vm_need_ept())
2164                         exec_control &= ~SECONDARY_EXEC_ENABLE_EPT;
2165                 vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
2166         }
2167
2168         vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, !!bypass_guest_pf);
2169         vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, !!bypass_guest_pf);
2170         vmcs_write32(CR3_TARGET_COUNT, 0);           /* 22.2.1 */
2171
2172         vmcs_writel(HOST_CR0, read_cr0());  /* 22.2.3 */
2173         vmcs_writel(HOST_CR4, read_cr4());  /* 22.2.3, 22.2.5 */
2174         vmcs_writel(HOST_CR3, read_cr3());  /* 22.2.3  FIXME: shadow tables */
2175
2176         vmcs_write16(HOST_CS_SELECTOR, __KERNEL_CS);  /* 22.2.4 */
2177         vmcs_write16(HOST_DS_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
2178         vmcs_write16(HOST_ES_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
2179         vmcs_write16(HOST_FS_SELECTOR, kvm_read_fs());    /* 22.2.4 */
2180         vmcs_write16(HOST_GS_SELECTOR, kvm_read_gs());    /* 22.2.4 */
2181         vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
2182 #ifdef CONFIG_X86_64
2183         rdmsrl(MSR_FS_BASE, a);
2184         vmcs_writel(HOST_FS_BASE, a); /* 22.2.4 */
2185         rdmsrl(MSR_GS_BASE, a);
2186         vmcs_writel(HOST_GS_BASE, a); /* 22.2.4 */
2187 #else
2188         vmcs_writel(HOST_FS_BASE, 0); /* 22.2.4 */
2189         vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */
2190 #endif
2191
2192         vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8);  /* 22.2.4 */
2193
2194         kvm_get_idt(&dt);
2195         vmcs_writel(HOST_IDTR_BASE, dt.base);   /* 22.2.4 */
2196
2197         asm("mov $.Lkvm_vmx_return, %0" : "=r"(kvm_vmx_return));
2198         vmcs_writel(HOST_RIP, kvm_vmx_return); /* 22.2.5 */
2199         vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0);
2200         vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0);
2201         vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0);
2202
2203         rdmsr(MSR_IA32_SYSENTER_CS, host_sysenter_cs, junk);
2204         vmcs_write32(HOST_IA32_SYSENTER_CS, host_sysenter_cs);
2205         rdmsrl(MSR_IA32_SYSENTER_ESP, a);
2206         vmcs_writel(HOST_IA32_SYSENTER_ESP, a);   /* 22.2.3 */
2207         rdmsrl(MSR_IA32_SYSENTER_EIP, a);
2208         vmcs_writel(HOST_IA32_SYSENTER_EIP, a);   /* 22.2.3 */
2209
2210         if (vmcs_config.vmexit_ctrl & VM_EXIT_LOAD_IA32_PAT) {
2211                 rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high);
2212                 host_pat = msr_low | ((u64) msr_high << 32);
2213                 vmcs_write64(HOST_IA32_PAT, host_pat);
2214         }
2215         if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
2216                 rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high);
2217                 host_pat = msr_low | ((u64) msr_high << 32);
2218                 /* Write the default value follow host pat */
2219                 vmcs_write64(GUEST_IA32_PAT, host_pat);
2220                 /* Keep arch.pat sync with GUEST_IA32_PAT */
2221                 vmx->vcpu.arch.pat = host_pat;
2222         }
2223
2224         for (i = 0; i < NR_VMX_MSR; ++i) {
2225                 u32 index = vmx_msr_index[i];
2226                 u32 data_low, data_high;
2227                 u64 data;
2228                 int j = vmx->nmsrs;
2229
2230                 if (rdmsr_safe(index, &data_low, &data_high) < 0)
2231                         continue;
2232                 if (wrmsr_safe(index, data_low, data_high) < 0)
2233                         continue;
2234                 data = data_low | ((u64)data_high << 32);
2235                 vmx->host_msrs[j].index = index;
2236                 vmx->host_msrs[j].reserved = 0;
2237                 vmx->host_msrs[j].data = data;
2238                 vmx->guest_msrs[j] = vmx->host_msrs[j];
2239                 ++vmx->nmsrs;
2240         }
2241
2242         vmcs_write32(VM_EXIT_CONTROLS, vmcs_config.vmexit_ctrl);
2243
2244         /* 22.2.1, 20.8.1 */
2245         vmcs_write32(VM_ENTRY_CONTROLS, vmcs_config.vmentry_ctrl);
2246
2247         vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL);
2248         vmcs_writel(CR4_GUEST_HOST_MASK, KVM_GUEST_CR4_MASK);
2249
2250         tsc_base = vmx->vcpu.kvm->arch.vm_init_tsc;
2251         rdtscll(tsc_this);
2252         if (tsc_this < vmx->vcpu.kvm->arch.vm_init_tsc)
2253                 tsc_base = tsc_this;
2254
2255         guest_write_tsc(0, tsc_base);
2256
2257         return 0;
2258 }
2259
2260 static int init_rmode(struct kvm *kvm)
2261 {
2262         if (!init_rmode_tss(kvm))
2263                 return 0;
2264         if (!init_rmode_identity_map(kvm))
2265                 return 0;
2266         return 1;
2267 }
2268
2269 static int vmx_vcpu_reset(struct kvm_vcpu *vcpu)
2270 {
2271         struct vcpu_vmx *vmx = to_vmx(vcpu);
2272         u64 msr;
2273         int ret;
2274
2275         vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP));
2276         down_read(&vcpu->kvm->slots_lock);
2277         if (!init_rmode(vmx->vcpu.kvm)) {
2278                 ret = -ENOMEM;
2279                 goto out;
2280         }
2281
2282         vmx->vcpu.arch.rmode.active = 0;
2283
2284         vmx->soft_vnmi_blocked = 0;
2285
2286         vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val();
2287         kvm_set_cr8(&vmx->vcpu, 0);
2288         msr = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
2289         if (vmx->vcpu.vcpu_id == 0)
2290                 msr |= MSR_IA32_APICBASE_BSP;
2291         kvm_set_apic_base(&vmx->vcpu, msr);
2292
2293         fx_init(&vmx->vcpu);
2294
2295         seg_setup(VCPU_SREG_CS);
2296         /*
2297          * GUEST_CS_BASE should really be 0xffff0000, but VT vm86 mode
2298          * insists on having GUEST_CS_BASE == GUEST_CS_SELECTOR << 4.  Sigh.
2299          */
2300         if (vmx->vcpu.vcpu_id == 0) {
2301                 vmcs_write16(GUEST_CS_SELECTOR, 0xf000);
2302                 vmcs_writel(GUEST_CS_BASE, 0x000f0000);
2303         } else {
2304                 vmcs_write16(GUEST_CS_SELECTOR, vmx->vcpu.arch.sipi_vector << 8);
2305                 vmcs_writel(GUEST_CS_BASE, vmx->vcpu.arch.sipi_vector << 12);
2306         }
2307
2308         seg_setup(VCPU_SREG_DS);
2309         seg_setup(VCPU_SREG_ES);
2310         seg_setup(VCPU_SREG_FS);
2311         seg_setup(VCPU_SREG_GS);
2312         seg_setup(VCPU_SREG_SS);
2313
2314         vmcs_write16(GUEST_TR_SELECTOR, 0);
2315         vmcs_writel(GUEST_TR_BASE, 0);
2316         vmcs_write32(GUEST_TR_LIMIT, 0xffff);
2317         vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
2318
2319         vmcs_write16(GUEST_LDTR_SELECTOR, 0);
2320         vmcs_writel(GUEST_LDTR_BASE, 0);
2321         vmcs_write32(GUEST_LDTR_LIMIT, 0xffff);
2322         vmcs_write32(GUEST_LDTR_AR_BYTES, 0x00082);
2323
2324         vmcs_write32(GUEST_SYSENTER_CS, 0);
2325         vmcs_writel(GUEST_SYSENTER_ESP, 0);
2326         vmcs_writel(GUEST_SYSENTER_EIP, 0);
2327
2328         vmcs_writel(GUEST_RFLAGS, 0x02);
2329         if (vmx->vcpu.vcpu_id == 0)
2330                 kvm_rip_write(vcpu, 0xfff0);
2331         else
2332                 kvm_rip_write(vcpu, 0);
2333         kvm_register_write(vcpu, VCPU_REGS_RSP, 0);
2334
2335         vmcs_writel(GUEST_DR7, 0x400);
2336
2337         vmcs_writel(GUEST_GDTR_BASE, 0);
2338         vmcs_write32(GUEST_GDTR_LIMIT, 0xffff);
2339
2340         vmcs_writel(GUEST_IDTR_BASE, 0);
2341         vmcs_write32(GUEST_IDTR_LIMIT, 0xffff);
2342
2343         vmcs_write32(GUEST_ACTIVITY_STATE, 0);
2344         vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, 0);
2345         vmcs_write32(GUEST_PENDING_DBG_EXCEPTIONS, 0);
2346
2347         /* Special registers */
2348         vmcs_write64(GUEST_IA32_DEBUGCTL, 0);
2349
2350         setup_msrs(vmx);
2351
2352         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0);  /* 22.2.1 */
2353
2354         if (cpu_has_vmx_tpr_shadow()) {
2355                 vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, 0);
2356                 if (vm_need_tpr_shadow(vmx->vcpu.kvm))
2357                         vmcs_write64(VIRTUAL_APIC_PAGE_ADDR,
2358                                 page_to_phys(vmx->vcpu.arch.apic->regs_page));
2359                 vmcs_write32(TPR_THRESHOLD, 0);
2360         }
2361
2362         if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
2363                 vmcs_write64(APIC_ACCESS_ADDR,
2364                              page_to_phys(vmx->vcpu.kvm->arch.apic_access_page));
2365
2366         if (vmx->vpid != 0)
2367                 vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid);
2368
2369         vmx->vcpu.arch.cr0 = 0x60000010;
2370         vmx_set_cr0(&vmx->vcpu, vmx->vcpu.arch.cr0); /* enter rmode */
2371         vmx_set_cr4(&vmx->vcpu, 0);
2372         vmx_set_efer(&vmx->vcpu, 0);
2373         vmx_fpu_activate(&vmx->vcpu);
2374         update_exception_bitmap(&vmx->vcpu);
2375
2376         vpid_sync_vcpu_all(vmx);
2377
2378         ret = 0;
2379
2380         /* HACK: Don't enable emulation on guest boot/reset */
2381         vmx->emulation_required = 0;
2382
2383 out:
2384         up_read(&vcpu->kvm->slots_lock);
2385         return ret;
2386 }
2387
2388 static void enable_irq_window(struct kvm_vcpu *vcpu)
2389 {
2390         u32 cpu_based_vm_exec_control;
2391
2392         cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
2393         cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING;
2394         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
2395 }
2396
2397 static void enable_nmi_window(struct kvm_vcpu *vcpu)
2398 {
2399         u32 cpu_based_vm_exec_control;
2400
2401         if (!cpu_has_virtual_nmis()) {
2402                 enable_irq_window(vcpu);
2403                 return;
2404         }
2405
2406         cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
2407         cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_NMI_PENDING;
2408         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
2409 }
2410
2411 static void vmx_inject_irq(struct kvm_vcpu *vcpu, int irq)
2412 {
2413         struct vcpu_vmx *vmx = to_vmx(vcpu);
2414
2415         KVMTRACE_1D(INJ_VIRQ, vcpu, (u32)irq, handler);
2416
2417         ++vcpu->stat.irq_injections;
2418         if (vcpu->arch.rmode.active) {
2419                 vmx->rmode.irq.pending = true;
2420                 vmx->rmode.irq.vector = irq;
2421                 vmx->rmode.irq.rip = kvm_rip_read(vcpu);
2422                 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
2423                              irq | INTR_TYPE_SOFT_INTR | INTR_INFO_VALID_MASK);
2424                 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
2425                 kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
2426                 return;
2427         }
2428         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
2429                         irq | INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
2430 }
2431
2432 static void vmx_inject_nmi(struct kvm_vcpu *vcpu)
2433 {
2434         struct vcpu_vmx *vmx = to_vmx(vcpu);
2435
2436         if (!cpu_has_virtual_nmis()) {
2437                 /*
2438                  * Tracking the NMI-blocked state in software is built upon
2439                  * finding the next open IRQ window. This, in turn, depends on
2440                  * well-behaving guests: They have to keep IRQs disabled at
2441                  * least as long as the NMI handler runs. Otherwise we may
2442                  * cause NMI nesting, maybe breaking the guest. But as this is
2443                  * highly unlikely, we can live with the residual risk.
2444                  */
2445                 vmx->soft_vnmi_blocked = 1;
2446                 vmx->vnmi_blocked_time = 0;
2447         }
2448
2449         ++vcpu->stat.nmi_injections;
2450         if (vcpu->arch.rmode.active) {
2451                 vmx->rmode.irq.pending = true;
2452                 vmx->rmode.irq.vector = NMI_VECTOR;
2453                 vmx->rmode.irq.rip = kvm_rip_read(vcpu);
2454                 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
2455                              NMI_VECTOR | INTR_TYPE_SOFT_INTR |
2456                              INTR_INFO_VALID_MASK);
2457                 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
2458                 kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
2459                 return;
2460         }
2461         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
2462                         INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR);
2463 }
2464
2465 static void vmx_update_window_states(struct kvm_vcpu *vcpu)
2466 {
2467         u32 guest_intr = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
2468
2469         vcpu->arch.nmi_window_open =
2470                 !(guest_intr & (GUEST_INTR_STATE_STI |
2471                                 GUEST_INTR_STATE_MOV_SS |
2472                                 GUEST_INTR_STATE_NMI));
2473         if (!cpu_has_virtual_nmis() && to_vmx(vcpu)->soft_vnmi_blocked)
2474                 vcpu->arch.nmi_window_open = 0;
2475
2476         vcpu->arch.interrupt_window_open =
2477                 ((vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
2478                  !(guest_intr & (GUEST_INTR_STATE_STI |
2479                                  GUEST_INTR_STATE_MOV_SS)));
2480 }
2481
2482 static void kvm_do_inject_irq(struct kvm_vcpu *vcpu)
2483 {
2484         int word_index = __ffs(vcpu->arch.irq_summary);
2485         int bit_index = __ffs(vcpu->arch.irq_pending[word_index]);
2486         int irq = word_index * BITS_PER_LONG + bit_index;
2487
2488         clear_bit(bit_index, &vcpu->arch.irq_pending[word_index]);
2489         if (!vcpu->arch.irq_pending[word_index])
2490                 clear_bit(word_index, &vcpu->arch.irq_summary);
2491         kvm_queue_interrupt(vcpu, irq);
2492 }
2493
2494 static void do_interrupt_requests(struct kvm_vcpu *vcpu,
2495                                        struct kvm_run *kvm_run)
2496 {
2497         vmx_update_window_states(vcpu);
2498
2499         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
2500                 vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO,
2501                                 GUEST_INTR_STATE_STI |
2502                                 GUEST_INTR_STATE_MOV_SS);
2503
2504         if (vcpu->arch.nmi_pending && !vcpu->arch.nmi_injected) {
2505                 if (vcpu->arch.interrupt.pending) {
2506                         enable_nmi_window(vcpu);
2507                 } else if (vcpu->arch.nmi_window_open) {
2508                         vcpu->arch.nmi_pending = false;
2509                         vcpu->arch.nmi_injected = true;
2510                 } else {
2511                         enable_nmi_window(vcpu);
2512                         return;
2513                 }
2514         }
2515         if (vcpu->arch.nmi_injected) {
2516                 vmx_inject_nmi(vcpu);
2517                 if (vcpu->arch.nmi_pending)
2518                         enable_nmi_window(vcpu);
2519                 else if (vcpu->arch.irq_summary
2520                          || kvm_run->request_interrupt_window)
2521                         enable_irq_window(vcpu);
2522                 return;
2523         }
2524
2525         if (vcpu->arch.interrupt_window_open) {
2526                 if (vcpu->arch.irq_summary && !vcpu->arch.interrupt.pending)
2527                         kvm_do_inject_irq(vcpu);
2528
2529                 if (vcpu->arch.interrupt.pending)
2530                         vmx_inject_irq(vcpu, vcpu->arch.interrupt.nr);
2531         }
2532         if (!vcpu->arch.interrupt_window_open &&
2533             (vcpu->arch.irq_summary || kvm_run->request_interrupt_window))
2534                 enable_irq_window(vcpu);
2535 }
2536
2537 static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr)
2538 {
2539         int ret;
2540         struct kvm_userspace_memory_region tss_mem = {
2541                 .slot = TSS_PRIVATE_MEMSLOT,
2542                 .guest_phys_addr = addr,
2543                 .memory_size = PAGE_SIZE * 3,
2544                 .flags = 0,
2545         };
2546
2547         ret = kvm_set_memory_region(kvm, &tss_mem, 0);
2548         if (ret)
2549                 return ret;
2550         kvm->arch.tss_addr = addr;
2551         return 0;
2552 }
2553
2554 static int handle_rmode_exception(struct kvm_vcpu *vcpu,
2555                                   int vec, u32 err_code)
2556 {
2557         /*
2558          * Instruction with address size override prefix opcode 0x67
2559          * Cause the #SS fault with 0 error code in VM86 mode.
2560          */
2561         if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0)
2562                 if (emulate_instruction(vcpu, NULL, 0, 0, 0) == EMULATE_DONE)
2563                         return 1;
2564         /*
2565          * Forward all other exceptions that are valid in real mode.
2566          * FIXME: Breaks guest debugging in real mode, needs to be fixed with
2567          *        the required debugging infrastructure rework.
2568          */
2569         switch (vec) {
2570         case DB_VECTOR:
2571                 if (vcpu->guest_debug &
2572                     (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
2573                         return 0;
2574                 kvm_queue_exception(vcpu, vec);
2575                 return 1;
2576         case BP_VECTOR:
2577                 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
2578                         return 0;
2579                 /* fall through */
2580         case DE_VECTOR:
2581         case OF_VECTOR:
2582         case BR_VECTOR:
2583         case UD_VECTOR:
2584         case DF_VECTOR:
2585         case SS_VECTOR:
2586         case GP_VECTOR:
2587         case MF_VECTOR:
2588                 kvm_queue_exception(vcpu, vec);
2589                 return 1;
2590         }
2591         return 0;
2592 }
2593
2594 static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2595 {
2596         struct vcpu_vmx *vmx = to_vmx(vcpu);
2597         u32 intr_info, ex_no, error_code;
2598         unsigned long cr2, rip, dr6;
2599         u32 vect_info;
2600         enum emulation_result er;
2601
2602         vect_info = vmx->idt_vectoring_info;
2603         intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
2604
2605         if ((vect_info & VECTORING_INFO_VALID_MASK) &&
2606                                                 !is_page_fault(intr_info))
2607                 printk(KERN_ERR "%s: unexpected, vectoring info 0x%x "
2608                        "intr info 0x%x\n", __func__, vect_info, intr_info);
2609
2610         if (!irqchip_in_kernel(vcpu->kvm) && is_external_interrupt(vect_info)) {
2611                 int irq = vect_info & VECTORING_INFO_VECTOR_MASK;
2612                 set_bit(irq, vcpu->arch.irq_pending);
2613                 set_bit(irq / BITS_PER_LONG, &vcpu->arch.irq_summary);
2614         }
2615
2616         if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR)
2617                 return 1;  /* already handled by vmx_vcpu_run() */
2618
2619         if (is_no_device(intr_info)) {
2620                 vmx_fpu_activate(vcpu);
2621                 return 1;
2622         }
2623
2624         if (is_invalid_opcode(intr_info)) {
2625                 er = emulate_instruction(vcpu, kvm_run, 0, 0, EMULTYPE_TRAP_UD);
2626                 if (er != EMULATE_DONE)
2627                         kvm_queue_exception(vcpu, UD_VECTOR);
2628                 return 1;
2629         }
2630
2631         error_code = 0;
2632         rip = kvm_rip_read(vcpu);
2633         if (intr_info & INTR_INFO_DELIVER_CODE_MASK)
2634                 error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
2635         if (is_page_fault(intr_info)) {
2636                 /* EPT won't cause page fault directly */
2637                 if (vm_need_ept())
2638                         BUG();
2639                 cr2 = vmcs_readl(EXIT_QUALIFICATION);
2640                 KVMTRACE_3D(PAGE_FAULT, vcpu, error_code, (u32)cr2,
2641                             (u32)((u64)cr2 >> 32), handler);
2642                 if (vcpu->arch.interrupt.pending || vcpu->arch.exception.pending)
2643                         kvm_mmu_unprotect_page_virt(vcpu, cr2);
2644                 return kvm_mmu_page_fault(vcpu, cr2, error_code);
2645         }
2646
2647         if (vcpu->arch.rmode.active &&
2648             handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK,
2649                                                                 error_code)) {
2650                 if (vcpu->arch.halt_request) {
2651                         vcpu->arch.halt_request = 0;
2652                         return kvm_emulate_halt(vcpu);
2653                 }
2654                 return 1;
2655         }
2656
2657         ex_no = intr_info & INTR_INFO_VECTOR_MASK;
2658         switch (ex_no) {
2659         case DB_VECTOR:
2660                 dr6 = vmcs_readl(EXIT_QUALIFICATION);
2661                 if (!(vcpu->guest_debug &
2662                       (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) {
2663                         vcpu->arch.dr6 = dr6 | DR6_FIXED_1;
2664                         kvm_queue_exception(vcpu, DB_VECTOR);
2665                         return 1;
2666                 }
2667                 kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1;
2668                 kvm_run->debug.arch.dr7 = vmcs_readl(GUEST_DR7);
2669                 /* fall through */
2670         case BP_VECTOR:
2671                 kvm_run->exit_reason = KVM_EXIT_DEBUG;
2672                 kvm_run->debug.arch.pc = vmcs_readl(GUEST_CS_BASE) + rip;
2673                 kvm_run->debug.arch.exception = ex_no;
2674                 break;
2675         default:
2676                 kvm_run->exit_reason = KVM_EXIT_EXCEPTION;
2677                 kvm_run->ex.exception = ex_no;
2678                 kvm_run->ex.error_code = error_code;
2679                 break;
2680         }
2681         return 0;
2682 }
2683
2684 static int handle_external_interrupt(struct kvm_vcpu *vcpu,
2685                                      struct kvm_run *kvm_run)
2686 {
2687         ++vcpu->stat.irq_exits;
2688         KVMTRACE_1D(INTR, vcpu, vmcs_read32(VM_EXIT_INTR_INFO), handler);
2689         return 1;
2690 }
2691
2692 static int handle_triple_fault(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2693 {
2694         kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
2695         return 0;
2696 }
2697
2698 static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2699 {
2700         unsigned long exit_qualification;
2701         int size, down, in, string, rep;
2702         unsigned port;
2703
2704         ++vcpu->stat.io_exits;
2705         exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
2706         string = (exit_qualification & 16) != 0;
2707
2708         if (string) {
2709                 if (emulate_instruction(vcpu,
2710                                         kvm_run, 0, 0, 0) == EMULATE_DO_MMIO)
2711                         return 0;
2712                 return 1;
2713         }
2714
2715         size = (exit_qualification & 7) + 1;
2716         in = (exit_qualification & 8) != 0;
2717         down = (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_DF) != 0;
2718         rep = (exit_qualification & 32) != 0;
2719         port = exit_qualification >> 16;
2720
2721         skip_emulated_instruction(vcpu);
2722         return kvm_emulate_pio(vcpu, kvm_run, in, size, port);
2723 }
2724
2725 static void
2726 vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
2727 {
2728         /*
2729          * Patch in the VMCALL instruction:
2730          */
2731         hypercall[0] = 0x0f;
2732         hypercall[1] = 0x01;
2733         hypercall[2] = 0xc1;
2734 }
2735
2736 static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2737 {
2738         unsigned long exit_qualification;
2739         int cr;
2740         int reg;
2741
2742         exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
2743         cr = exit_qualification & 15;
2744         reg = (exit_qualification >> 8) & 15;
2745         switch ((exit_qualification >> 4) & 3) {
2746         case 0: /* mov to cr */
2747                 KVMTRACE_3D(CR_WRITE, vcpu, (u32)cr,
2748                             (u32)kvm_register_read(vcpu, reg),
2749                             (u32)((u64)kvm_register_read(vcpu, reg) >> 32),
2750                             handler);
2751                 switch (cr) {
2752                 case 0:
2753                         kvm_set_cr0(vcpu, kvm_register_read(vcpu, reg));
2754                         skip_emulated_instruction(vcpu);
2755                         return 1;
2756                 case 3:
2757                         kvm_set_cr3(vcpu, kvm_register_read(vcpu, reg));
2758                         skip_emulated_instruction(vcpu);
2759                         return 1;
2760                 case 4:
2761                         kvm_set_cr4(vcpu, kvm_register_read(vcpu, reg));
2762                         skip_emulated_instruction(vcpu);
2763                         return 1;
2764                 case 8:
2765                         kvm_set_cr8(vcpu, kvm_register_read(vcpu, reg));
2766                         skip_emulated_instruction(vcpu);
2767                         if (irqchip_in_kernel(vcpu->kvm))
2768                                 return 1;
2769                         kvm_run->exit_reason = KVM_EXIT_SET_TPR;
2770                         return 0;
2771                 };
2772                 break;
2773         case 2: /* clts */
2774                 vmx_fpu_deactivate(vcpu);
2775                 vcpu->arch.cr0 &= ~X86_CR0_TS;
2776                 vmcs_writel(CR0_READ_SHADOW, vcpu->arch.cr0);
2777                 vmx_fpu_activate(vcpu);
2778                 KVMTRACE_0D(CLTS, vcpu, handler);
2779                 skip_emulated_instruction(vcpu);
2780                 return 1;
2781         case 1: /*mov from cr*/
2782                 switch (cr) {
2783                 case 3:
2784                         kvm_register_write(vcpu, reg, vcpu->arch.cr3);
2785                         KVMTRACE_3D(CR_READ, vcpu, (u32)cr,
2786                                     (u32)kvm_register_read(vcpu, reg),
2787                                     (u32)((u64)kvm_register_read(vcpu, reg) >> 32),
2788                                     handler);
2789                         skip_emulated_instruction(vcpu);
2790                         return 1;
2791                 case 8:
2792                         kvm_register_write(vcpu, reg, kvm_get_cr8(vcpu));
2793                         KVMTRACE_2D(CR_READ, vcpu, (u32)cr,
2794                                     (u32)kvm_register_read(vcpu, reg), handler);
2795                         skip_emulated_instruction(vcpu);
2796                         return 1;
2797                 }
2798                 break;
2799         case 3: /* lmsw */
2800                 kvm_lmsw(vcpu, (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f);
2801
2802                 skip_emulated_instruction(vcpu);
2803                 return 1;
2804         default:
2805                 break;
2806         }
2807         kvm_run->exit_reason = 0;
2808         pr_unimpl(vcpu, "unhandled control register: op %d cr %d\n",
2809                (int)(exit_qualification >> 4) & 3, cr);
2810         return 0;
2811 }
2812
2813 static int handle_dr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2814 {
2815         unsigned long exit_qualification;
2816         unsigned long val;
2817         int dr, reg;
2818
2819         dr = vmcs_readl(GUEST_DR7);
2820         if (dr & DR7_GD) {
2821                 /*
2822                  * As the vm-exit takes precedence over the debug trap, we
2823                  * need to emulate the latter, either for the host or the
2824                  * guest debugging itself.
2825                  */
2826                 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
2827                         kvm_run->debug.arch.dr6 = vcpu->arch.dr6;
2828                         kvm_run->debug.arch.dr7 = dr;
2829                         kvm_run->debug.arch.pc =
2830                                 vmcs_readl(GUEST_CS_BASE) +
2831                                 vmcs_readl(GUEST_RIP);
2832                         kvm_run->debug.arch.exception = DB_VECTOR;
2833                         kvm_run->exit_reason = KVM_EXIT_DEBUG;
2834                         return 0;
2835                 } else {
2836                         vcpu->arch.dr7 &= ~DR7_GD;
2837                         vcpu->arch.dr6 |= DR6_BD;
2838                         vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
2839                         kvm_queue_exception(vcpu, DB_VECTOR);
2840                         return 1;
2841                 }
2842         }
2843
2844         exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
2845         dr = exit_qualification & DEBUG_REG_ACCESS_NUM;
2846         reg = DEBUG_REG_ACCESS_REG(exit_qualification);
2847         if (exit_qualification & TYPE_MOV_FROM_DR) {
2848                 switch (dr) {
2849                 case 0 ... 3:
2850                         val = vcpu->arch.db[dr];
2851                         break;
2852                 case 6:
2853                         val = vcpu->arch.dr6;
2854                         break;
2855                 case 7:
2856                         val = vcpu->arch.dr7;
2857                         break;
2858                 default:
2859                         val = 0;
2860                 }
2861                 kvm_register_write(vcpu, reg, val);
2862                 KVMTRACE_2D(DR_READ, vcpu, (u32)dr, (u32)val, handler);
2863         } else {
2864                 val = vcpu->arch.regs[reg];
2865                 switch (dr) {
2866                 case 0 ... 3:
2867                         vcpu->arch.db[dr] = val;
2868                         if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
2869                                 vcpu->arch.eff_db[dr] = val;
2870                         break;
2871                 case 4 ... 5:
2872                         if (vcpu->arch.cr4 & X86_CR4_DE)
2873                                 kvm_queue_exception(vcpu, UD_VECTOR);
2874                         break;
2875                 case 6:
2876                         if (val & 0xffffffff00000000ULL) {
2877                                 kvm_queue_exception(vcpu, GP_VECTOR);
2878                                 break;
2879                         }
2880                         vcpu->arch.dr6 = (val & DR6_VOLATILE) | DR6_FIXED_1;
2881                         break;
2882                 case 7:
2883                         if (val & 0xffffffff00000000ULL) {
2884                                 kvm_queue_exception(vcpu, GP_VECTOR);
2885                                 break;
2886                         }
2887                         vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1;
2888                         if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) {
2889                                 vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
2890                                 vcpu->arch.switch_db_regs =
2891                                         (val & DR7_BP_EN_MASK);
2892                         }
2893                         break;
2894                 }
2895                 KVMTRACE_2D(DR_WRITE, vcpu, (u32)dr, (u32)val, handler);
2896         }
2897         skip_emulated_instruction(vcpu);
2898         return 1;
2899 }
2900
2901 static int handle_cpuid(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2902 {
2903         kvm_emulate_cpuid(vcpu);
2904         return 1;
2905 }
2906
2907 static int handle_rdmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2908 {
2909         u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
2910         u64 data;
2911
2912         if (vmx_get_msr(vcpu, ecx, &data)) {
2913                 kvm_inject_gp(vcpu, 0);
2914                 return 1;
2915         }
2916
2917         KVMTRACE_3D(MSR_READ, vcpu, ecx, (u32)data, (u32)(data >> 32),
2918                     handler);
2919
2920         /* FIXME: handling of bits 32:63 of rax, rdx */
2921         vcpu->arch.regs[VCPU_REGS_RAX] = data & -1u;
2922         vcpu->arch.regs[VCPU_REGS_RDX] = (data >> 32) & -1u;
2923         skip_emulated_instruction(vcpu);
2924         return 1;
2925 }
2926
2927 static int handle_wrmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2928 {
2929         u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
2930         u64 data = (vcpu->arch.regs[VCPU_REGS_RAX] & -1u)
2931                 | ((u64)(vcpu->arch.regs[VCPU_REGS_RDX] & -1u) << 32);
2932
2933         KVMTRACE_3D(MSR_WRITE, vcpu, ecx, (u32)data, (u32)(data >> 32),
2934                     handler);
2935
2936         if (vmx_set_msr(vcpu, ecx, data) != 0) {
2937                 kvm_inject_gp(vcpu, 0);
2938                 return 1;
2939         }
2940
2941         skip_emulated_instruction(vcpu);
2942         return 1;
2943 }
2944
2945 static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu,
2946                                       struct kvm_run *kvm_run)
2947 {
2948         return 1;
2949 }
2950
2951 static int handle_interrupt_window(struct kvm_vcpu *vcpu,
2952                                    struct kvm_run *kvm_run)
2953 {
2954         u32 cpu_based_vm_exec_control;
2955
2956         /* clear pending irq */
2957         cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
2958         cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
2959         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
2960
2961         KVMTRACE_0D(PEND_INTR, vcpu, handler);
2962         ++vcpu->stat.irq_window_exits;
2963
2964         /*
2965          * If the user space waits to inject interrupts, exit as soon as
2966          * possible
2967          */
2968         if (kvm_run->request_interrupt_window &&
2969             !vcpu->arch.irq_summary) {
2970                 kvm_run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
2971                 return 0;
2972         }
2973         return 1;
2974 }
2975
2976 static int handle_halt(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2977 {
2978         skip_emulated_instruction(vcpu);
2979         return kvm_emulate_halt(vcpu);
2980 }
2981
2982 static int handle_vmcall(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2983 {
2984         skip_emulated_instruction(vcpu);
2985         kvm_emulate_hypercall(vcpu);
2986         return 1;
2987 }
2988
2989 static int handle_invlpg(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2990 {
2991         u64 exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
2992
2993         kvm_mmu_invlpg(vcpu, exit_qualification);
2994         skip_emulated_instruction(vcpu);
2995         return 1;
2996 }
2997
2998 static int handle_wbinvd(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2999 {
3000         skip_emulated_instruction(vcpu);
3001         /* TODO: Add support for VT-d/pass-through device */
3002         return 1;
3003 }
3004
3005 static int handle_apic_access(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3006 {
3007         u64 exit_qualification;
3008         enum emulation_result er;
3009         unsigned long offset;
3010
3011         exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
3012         offset = exit_qualification & 0xffful;
3013
3014         er = emulate_instruction(vcpu, kvm_run, 0, 0, 0);
3015
3016         if (er !=  EMULATE_DONE) {
3017                 printk(KERN_ERR
3018                        "Fail to handle apic access vmexit! Offset is 0x%lx\n",
3019                        offset);
3020                 return -ENOTSUPP;
3021         }
3022         return 1;
3023 }
3024
3025 static int handle_task_switch(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3026 {
3027         struct vcpu_vmx *vmx = to_vmx(vcpu);
3028         unsigned long exit_qualification;
3029         u16 tss_selector;
3030         int reason;
3031
3032         exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
3033
3034         reason = (u32)exit_qualification >> 30;
3035         if (reason == TASK_SWITCH_GATE && vmx->vcpu.arch.nmi_injected &&
3036             (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK) &&
3037             (vmx->idt_vectoring_info & VECTORING_INFO_TYPE_MASK)
3038             == INTR_TYPE_NMI_INTR) {
3039                 vcpu->arch.nmi_injected = false;
3040                 if (cpu_has_virtual_nmis())
3041                         vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
3042                                       GUEST_INTR_STATE_NMI);
3043         }
3044         tss_selector = exit_qualification;
3045
3046         if (!kvm_task_switch(vcpu, tss_selector, reason))
3047                 return 0;
3048
3049         /* clear all local breakpoint enable flags */
3050         vmcs_writel(GUEST_DR7, vmcs_readl(GUEST_DR7) & ~55);
3051
3052         /*
3053          * TODO: What about debug traps on tss switch?
3054          *       Are we supposed to inject them and update dr6?
3055          */
3056
3057         return 1;
3058 }
3059
3060 static int handle_ept_violation(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3061 {
3062         u64 exit_qualification;
3063         enum emulation_result er;
3064         gpa_t gpa;
3065         unsigned long hva;
3066         int gla_validity;
3067         int r;
3068
3069         exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
3070
3071         if (exit_qualification & (1 << 6)) {
3072                 printk(KERN_ERR "EPT: GPA exceeds GAW!\n");
3073                 return -ENOTSUPP;
3074         }
3075
3076         gla_validity = (exit_qualification >> 7) & 0x3;
3077         if (gla_validity != 0x3 && gla_validity != 0x1 && gla_validity != 0) {
3078                 printk(KERN_ERR "EPT: Handling EPT violation failed!\n");
3079                 printk(KERN_ERR "EPT: GPA: 0x%lx, GVA: 0x%lx\n",
3080                         (long unsigned int)vmcs_read64(GUEST_PHYSICAL_ADDRESS),
3081                         (long unsigned int)vmcs_read64(GUEST_LINEAR_ADDRESS));
3082                 printk(KERN_ERR "EPT: Exit qualification is 0x%lx\n",
3083                         (long unsigned int)exit_qualification);
3084                 kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
3085                 kvm_run->hw.hardware_exit_reason = 0;
3086                 return -ENOTSUPP;
3087         }
3088
3089         gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
3090         hva = gfn_to_hva(vcpu->kvm, gpa >> PAGE_SHIFT);
3091         if (!kvm_is_error_hva(hva)) {
3092                 r = kvm_mmu_page_fault(vcpu, gpa & PAGE_MASK, 0);
3093                 if (r < 0) {
3094                         printk(KERN_ERR "EPT: Not enough memory!\n");
3095                         return -ENOMEM;
3096                 }
3097                 return 1;
3098         } else {
3099                 /* must be MMIO */
3100                 er = emulate_instruction(vcpu, kvm_run, 0, 0, 0);
3101
3102                 if (er == EMULATE_FAIL) {
3103                         printk(KERN_ERR
3104                          "EPT: Fail to handle EPT violation vmexit!er is %d\n",
3105                          er);
3106                         printk(KERN_ERR "EPT: GPA: 0x%lx, GVA: 0x%lx\n",
3107                          (long unsigned int)vmcs_read64(GUEST_PHYSICAL_ADDRESS),
3108                          (long unsigned int)vmcs_read64(GUEST_LINEAR_ADDRESS));
3109                         printk(KERN_ERR "EPT: Exit qualification is 0x%lx\n",
3110                                 (long unsigned int)exit_qualification);
3111                         return -ENOTSUPP;
3112                 } else if (er == EMULATE_DO_MMIO)
3113                         return 0;
3114         }
3115         return 1;
3116 }
3117
3118 static int handle_nmi_window(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3119 {
3120         u32 cpu_based_vm_exec_control;
3121
3122         /* clear pending NMI */
3123         cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
3124         cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING;
3125         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
3126         ++vcpu->stat.nmi_window_exits;
3127
3128         return 1;
3129 }
3130
3131 static void handle_invalid_guest_state(struct kvm_vcpu *vcpu,
3132                                 struct kvm_run *kvm_run)
3133 {
3134         struct vcpu_vmx *vmx = to_vmx(vcpu);
3135         enum emulation_result err = EMULATE_DONE;
3136
3137         preempt_enable();
3138         local_irq_enable();
3139
3140         while (!guest_state_valid(vcpu)) {
3141                 err = emulate_instruction(vcpu, kvm_run, 0, 0, 0);
3142
3143                 if (err == EMULATE_DO_MMIO)
3144                         break;
3145
3146                 if (err != EMULATE_DONE) {
3147                         kvm_report_emulation_failure(vcpu, "emulation failure");
3148                         return;
3149                 }
3150
3151                 if (signal_pending(current))
3152                         break;
3153                 if (need_resched())
3154                         schedule();
3155         }
3156
3157         local_irq_disable();
3158         preempt_disable();
3159
3160         vmx->invalid_state_emulation_result = err;
3161 }
3162
3163 /*
3164  * The exit handlers return 1 if the exit was handled fully and guest execution
3165  * may resume.  Otherwise they set the kvm_run parameter to indicate what needs
3166  * to be done to userspace and return 0.
3167  */
3168 static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu,
3169                                       struct kvm_run *kvm_run) = {
3170         [EXIT_REASON_EXCEPTION_NMI]           = handle_exception,
3171         [EXIT_REASON_EXTERNAL_INTERRUPT]      = handle_external_interrupt,
3172         [EXIT_REASON_TRIPLE_FAULT]            = handle_triple_fault,
3173         [EXIT_REASON_NMI_WINDOW]              = handle_nmi_window,
3174         [EXIT_REASON_IO_INSTRUCTION]          = handle_io,
3175         [EXIT_REASON_CR_ACCESS]               = handle_cr,
3176         [EXIT_REASON_DR_ACCESS]               = handle_dr,
3177         [EXIT_REASON_CPUID]                   = handle_cpuid,
3178         [EXIT_REASON_MSR_READ]                = handle_rdmsr,
3179         [EXIT_REASON_MSR_WRITE]               = handle_wrmsr,
3180         [EXIT_REASON_PENDING_INTERRUPT]       = handle_interrupt_window,
3181         [EXIT_REASON_HLT]                     = handle_halt,
3182         [EXIT_REASON_INVLPG]                  = handle_invlpg,
3183         [EXIT_REASON_VMCALL]                  = handle_vmcall,
3184         [EXIT_REASON_TPR_BELOW_THRESHOLD]     = handle_tpr_below_threshold,
3185         [EXIT_REASON_APIC_ACCESS]             = handle_apic_access,
3186         [EXIT_REASON_WBINVD]                  = handle_wbinvd,
3187         [EXIT_REASON_TASK_SWITCH]             = handle_task_switch,
3188         [EXIT_REASON_EPT_VIOLATION]           = handle_ept_violation,
3189 };
3190
3191 static const int kvm_vmx_max_exit_handlers =
3192         ARRAY_SIZE(kvm_vmx_exit_handlers);
3193
3194 /*
3195  * The guest has exited.  See if we can fix it or if we need userspace
3196  * assistance.
3197  */
3198 static int kvm_handle_exit(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
3199 {
3200         u32 exit_reason = vmcs_read32(VM_EXIT_REASON);
3201         struct vcpu_vmx *vmx = to_vmx(vcpu);
3202         u32 vectoring_info = vmx->idt_vectoring_info;
3203
3204         KVMTRACE_3D(VMEXIT, vcpu, exit_reason, (u32)kvm_rip_read(vcpu),
3205                     (u32)((u64)kvm_rip_read(vcpu) >> 32), entryexit);
3206
3207         /* If we need to emulate an MMIO from handle_invalid_guest_state
3208          * we just return 0 */
3209         if (vmx->emulation_required && emulate_invalid_guest_state) {
3210                 if (guest_state_valid(vcpu))
3211                         vmx->emulation_required = 0;
3212                 return vmx->invalid_state_emulation_result != EMULATE_DO_MMIO;
3213         }
3214
3215         /* Access CR3 don't cause VMExit in paging mode, so we need
3216          * to sync with guest real CR3. */
3217         if (vm_need_ept() && is_paging(vcpu)) {
3218                 vcpu->arch.cr3 = vmcs_readl(GUEST_CR3);
3219                 ept_load_pdptrs(vcpu);
3220         }
3221
3222         if (unlikely(vmx->fail)) {
3223                 kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
3224                 kvm_run->fail_entry.hardware_entry_failure_reason
3225                         = vmcs_read32(VM_INSTRUCTION_ERROR);
3226                 return 0;
3227         }
3228
3229         if ((vectoring_info & VECTORING_INFO_VALID_MASK) &&
3230                         (exit_reason != EXIT_REASON_EXCEPTION_NMI &&
3231                         exit_reason != EXIT_REASON_EPT_VIOLATION &&
3232                         exit_reason != EXIT_REASON_TASK_SWITCH))
3233                 printk(KERN_WARNING "%s: unexpected, valid vectoring info "
3234                        "(0x%x) and exit reason is 0x%x\n",
3235                        __func__, vectoring_info, exit_reason);
3236
3237         if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked)) {
3238                 if (vcpu->arch.interrupt_window_open) {
3239                         vmx->soft_vnmi_blocked = 0;
3240                         vcpu->arch.nmi_window_open = 1;
3241                 } else if (vmx->vnmi_blocked_time > 1000000000LL &&
3242                            vcpu->arch.nmi_pending) {
3243                         /*
3244                          * This CPU don't support us in finding the end of an
3245                          * NMI-blocked window if the guest runs with IRQs
3246                          * disabled. So we pull the trigger after 1 s of
3247                          * futile waiting, but inform the user about this.
3248                          */
3249                         printk(KERN_WARNING "%s: Breaking out of NMI-blocked "
3250                                "state on VCPU %d after 1 s timeout\n",
3251                                __func__, vcpu->vcpu_id);
3252                         vmx->soft_vnmi_blocked = 0;
3253                         vmx->vcpu.arch.nmi_window_open = 1;
3254                 }
3255         }
3256
3257         if (exit_reason < kvm_vmx_max_exit_handlers
3258             && kvm_vmx_exit_handlers[exit_reason])
3259                 return kvm_vmx_exit_handlers[exit_reason](vcpu, kvm_run);
3260         else {
3261                 kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
3262                 kvm_run->hw.hardware_exit_reason = exit_reason;
3263         }
3264         return 0;
3265 }
3266
3267 static void update_tpr_threshold(struct kvm_vcpu *vcpu)
3268 {
3269         int max_irr, tpr;
3270
3271         if (!vm_need_tpr_shadow(vcpu->kvm))
3272                 return;
3273
3274         if (!kvm_lapic_enabled(vcpu) ||
3275             ((max_irr = kvm_lapic_find_highest_irr(vcpu)) == -1)) {
3276                 vmcs_write32(TPR_THRESHOLD, 0);
3277                 return;
3278         }
3279
3280         tpr = (kvm_lapic_get_cr8(vcpu) & 0x0f) << 4;
3281         vmcs_write32(TPR_THRESHOLD, (max_irr > tpr) ? tpr >> 4 : max_irr >> 4);
3282 }
3283
3284 static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
3285 {
3286         u32 exit_intr_info;
3287         u32 idt_vectoring_info;
3288         bool unblock_nmi;
3289         u8 vector;
3290         int type;
3291         bool idtv_info_valid;
3292         u32 error;
3293
3294         exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
3295         if (cpu_has_virtual_nmis()) {
3296                 unblock_nmi = (exit_intr_info & INTR_INFO_UNBLOCK_NMI) != 0;
3297                 vector = exit_intr_info & INTR_INFO_VECTOR_MASK;
3298                 /*
3299                  * SDM 3: 25.7.1.2
3300                  * Re-set bit "block by NMI" before VM entry if vmexit caused by
3301                  * a guest IRET fault.
3302                  */
3303                 if (unblock_nmi && vector != DF_VECTOR)
3304                         vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
3305                                       GUEST_INTR_STATE_NMI);
3306         } else if (unlikely(vmx->soft_vnmi_blocked))
3307                 vmx->vnmi_blocked_time +=
3308                         ktime_to_ns(ktime_sub(ktime_get(), vmx->entry_time));
3309
3310         idt_vectoring_info = vmx->idt_vectoring_info;
3311         idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK;
3312         vector = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK;
3313         type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK;
3314         if (vmx->vcpu.arch.nmi_injected) {
3315                 /*
3316                  * SDM 3: 25.7.1.2
3317                  * Clear bit "block by NMI" before VM entry if a NMI delivery
3318                  * faulted.
3319                  */
3320                 if (idtv_info_valid && type == INTR_TYPE_NMI_INTR)
3321                         vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO,
3322                                         GUEST_INTR_STATE_NMI);
3323                 else
3324                         vmx->vcpu.arch.nmi_injected = false;
3325         }
3326         kvm_clear_exception_queue(&vmx->vcpu);
3327         if (idtv_info_valid && (type == INTR_TYPE_HARD_EXCEPTION ||
3328                                 type == INTR_TYPE_SOFT_EXCEPTION)) {
3329                 if (idt_vectoring_info & VECTORING_INFO_DELIVER_CODE_MASK) {
3330                         error = vmcs_read32(IDT_VECTORING_ERROR_CODE);
3331                         kvm_queue_exception_e(&vmx->vcpu, vector, error);
3332                 } else
3333                         kvm_queue_exception(&vmx->vcpu, vector);
3334                 vmx->idt_vectoring_info = 0;
3335         }
3336         kvm_clear_interrupt_queue(&vmx->vcpu);
3337         if (idtv_info_valid && type == INTR_TYPE_EXT_INTR) {
3338                 kvm_queue_interrupt(&vmx->vcpu, vector);
3339                 vmx->idt_vectoring_info = 0;
3340         }
3341 }
3342
3343 static void vmx_intr_assist(struct kvm_vcpu *vcpu)
3344 {
3345         update_tpr_threshold(vcpu);
3346
3347         vmx_update_window_states(vcpu);
3348
3349         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
3350                 vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO,
3351                                 GUEST_INTR_STATE_STI |
3352                                 GUEST_INTR_STATE_MOV_SS);
3353
3354         if (vcpu->arch.nmi_pending && !vcpu->arch.nmi_injected) {
3355                 if (vcpu->arch.interrupt.pending) {
3356                         enable_nmi_window(vcpu);
3357                 } else if (vcpu->arch.nmi_window_open) {
3358                         vcpu->arch.nmi_pending = false;
3359                         vcpu->arch.nmi_injected = true;
3360                 } else {
3361                         enable_nmi_window(vcpu);
3362                         return;
3363                 }
3364         }
3365         if (vcpu->arch.nmi_injected) {
3366                 vmx_inject_nmi(vcpu);
3367                 if (vcpu->arch.nmi_pending)
3368                         enable_nmi_window(vcpu);
3369                 else if (kvm_cpu_has_interrupt(vcpu))
3370                         enable_irq_window(vcpu);
3371                 return;
3372         }
3373         if (!vcpu->arch.interrupt.pending && kvm_cpu_has_interrupt(vcpu)) {
3374                 if (vcpu->arch.interrupt_window_open)
3375                         kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu));
3376                 else
3377                         enable_irq_window(vcpu);
3378         }
3379         if (vcpu->arch.interrupt.pending) {
3380                 vmx_inject_irq(vcpu, vcpu->arch.interrupt.nr);
3381                 if (kvm_cpu_has_interrupt(vcpu))
3382                         enable_irq_window(vcpu);
3383         }
3384 }
3385
3386 /*
3387  * Failure to inject an interrupt should give us the information
3388  * in IDT_VECTORING_INFO_FIELD.  However, if the failure occurs
3389  * when fetching the interrupt redirection bitmap in the real-mode
3390  * tss, this doesn't happen.  So we do it ourselves.
3391  */
3392 static void fixup_rmode_irq(struct vcpu_vmx *vmx)
3393 {
3394         vmx->rmode.irq.pending = 0;
3395         if (kvm_rip_read(&vmx->vcpu) + 1 != vmx->rmode.irq.rip)
3396                 return;
3397         kvm_rip_write(&vmx->vcpu, vmx->rmode.irq.rip);
3398         if (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK) {
3399                 vmx->idt_vectoring_info &= ~VECTORING_INFO_TYPE_MASK;
3400                 vmx->idt_vectoring_info |= INTR_TYPE_EXT_INTR;
3401                 return;
3402         }
3403         vmx->idt_vectoring_info =
3404                 VECTORING_INFO_VALID_MASK
3405                 | INTR_TYPE_EXT_INTR
3406                 | vmx->rmode.irq.vector;
3407 }
3408
3409 #ifdef CONFIG_X86_64
3410 #define R "r"
3411 #define Q "q"
3412 #else
3413 #define R "e"
3414 #define Q "l"
3415 #endif
3416
3417 static void vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3418 {
3419         struct vcpu_vmx *vmx = to_vmx(vcpu);
3420         u32 intr_info;
3421
3422         /* Record the guest's net vcpu time for enforced NMI injections. */
3423         if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked))
3424                 vmx->entry_time = ktime_get();
3425
3426         /* Handle invalid guest state instead of entering VMX */
3427         if (vmx->emulation_required && emulate_invalid_guest_state) {
3428                 handle_invalid_guest_state(vcpu, kvm_run);
3429                 return;
3430         }
3431
3432         if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty))
3433                 vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);
3434         if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))
3435                 vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]);
3436
3437         /*
3438          * Loading guest fpu may have cleared host cr0.ts
3439          */
3440         vmcs_writel(HOST_CR0, read_cr0());
3441
3442         set_debugreg(vcpu->arch.dr6, 6);
3443
3444         asm(
3445                 /* Store host registers */
3446                 "push %%"R"dx; push %%"R"bp;"
3447                 "push %%"R"cx \n\t"
3448                 "cmp %%"R"sp, %c[host_rsp](%0) \n\t"
3449                 "je 1f \n\t"
3450                 "mov %%"R"sp, %c[host_rsp](%0) \n\t"
3451                 __ex(ASM_VMX_VMWRITE_RSP_RDX) "\n\t"
3452                 "1: \n\t"
3453                 /* Check if vmlaunch of vmresume is needed */
3454                 "cmpl $0, %c[launched](%0) \n\t"
3455                 /* Load guest registers.  Don't clobber flags. */
3456                 "mov %c[cr2](%0), %%"R"ax \n\t"
3457                 "mov %%"R"ax, %%cr2 \n\t"
3458                 "mov %c[rax](%0), %%"R"ax \n\t"
3459                 "mov %c[rbx](%0), %%"R"bx \n\t"
3460                 "mov %c[rdx](%0), %%"R"dx \n\t"
3461                 "mov %c[rsi](%0), %%"R"si \n\t"
3462                 "mov %c[rdi](%0), %%"R"di \n\t"
3463                 "mov %c[rbp](%0), %%"R"bp \n\t"
3464 #ifdef CONFIG_X86_64
3465                 "mov %c[r8](%0),  %%r8  \n\t"
3466                 "mov %c[r9](%0),  %%r9  \n\t"
3467                 "mov %c[r10](%0), %%r10 \n\t"
3468                 "mov %c[r11](%0), %%r11 \n\t"
3469                 "mov %c[r12](%0), %%r12 \n\t"
3470                 "mov %c[r13](%0), %%r13 \n\t"
3471                 "mov %c[r14](%0), %%r14 \n\t"
3472                 "mov %c[r15](%0), %%r15 \n\t"
3473 #endif
3474                 "mov %c[rcx](%0), %%"R"cx \n\t" /* kills %0 (ecx) */
3475
3476                 /* Enter guest mode */
3477                 "jne .Llaunched \n\t"
3478                 __ex(ASM_VMX_VMLAUNCH) "\n\t"
3479                 "jmp .Lkvm_vmx_return \n\t"
3480                 ".Llaunched: " __ex(ASM_VMX_VMRESUME) "\n\t"
3481                 ".Lkvm_vmx_return: "
3482                 /* Save guest registers, load host registers, keep flags */
3483                 "xchg %0,     (%%"R"sp) \n\t"
3484                 "mov %%"R"ax, %c[rax](%0) \n\t"
3485                 "mov %%"R"bx, %c[rbx](%0) \n\t"
3486                 "push"Q" (%%"R"sp); pop"Q" %c[rcx](%0) \n\t"
3487                 "mov %%"R"dx, %c[rdx](%0) \n\t"
3488                 "mov %%"R"si, %c[rsi](%0) \n\t"
3489                 "mov %%"R"di, %c[rdi](%0) \n\t"
3490                 "mov %%"R"bp, %c[rbp](%0) \n\t"
3491 #ifdef CONFIG_X86_64
3492                 "mov %%r8,  %c[r8](%0) \n\t"
3493                 "mov %%r9,  %c[r9](%0) \n\t"
3494                 "mov %%r10, %c[r10](%0) \n\t"
3495                 "mov %%r11, %c[r11](%0) \n\t"
3496                 "mov %%r12, %c[r12](%0) \n\t"
3497                 "mov %%r13, %c[r13](%0) \n\t"
3498                 "mov %%r14, %c[r14](%0) \n\t"
3499                 "mov %%r15, %c[r15](%0) \n\t"
3500 #endif
3501                 "mov %%cr2, %%"R"ax   \n\t"
3502                 "mov %%"R"ax, %c[cr2](%0) \n\t"
3503
3504                 "pop  %%"R"bp; pop  %%"R"bp; pop  %%"R"dx \n\t"
3505                 "setbe %c[fail](%0) \n\t"
3506               : : "c"(vmx), "d"((unsigned long)HOST_RSP),
3507                 [launched]"i"(offsetof(struct vcpu_vmx, launched)),
3508                 [fail]"i"(offsetof(struct vcpu_vmx, fail)),
3509                 [host_rsp]"i"(offsetof(struct vcpu_vmx, host_rsp)),
3510                 [rax]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RAX])),
3511                 [rbx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBX])),
3512                 [rcx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RCX])),
3513                 [rdx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDX])),
3514                 [rsi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RSI])),
3515                 [rdi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDI])),
3516                 [rbp]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBP])),
3517 #ifdef CONFIG_X86_64
3518                 [r8]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R8])),
3519                 [r9]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R9])),
3520                 [r10]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R10])),
3521                 [r11]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R11])),
3522                 [r12]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R12])),
3523                 [r13]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R13])),
3524                 [r14]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R14])),
3525                 [r15]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R15])),
3526 #endif
3527                 [cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2))
3528               : "cc", "memory"
3529                 , R"bx", R"di", R"si"
3530 #ifdef CONFIG_X86_64
3531                 , "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
3532 #endif
3533               );
3534
3535         vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP));
3536         vcpu->arch.regs_dirty = 0;
3537
3538         get_debugreg(vcpu->arch.dr6, 6);
3539
3540         vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
3541         if (vmx->rmode.irq.pending)
3542                 fixup_rmode_irq(vmx);
3543
3544         vmx_update_window_states(vcpu);
3545
3546         asm("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS));
3547         vmx->launched = 1;
3548
3549         intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
3550
3551         /* We need to handle NMIs before interrupts are enabled */
3552         if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR &&
3553             (intr_info & INTR_INFO_VALID_MASK)) {
3554                 KVMTRACE_0D(NMI, vcpu, handler);
3555                 asm("int $2");
3556         }
3557
3558         vmx_complete_interrupts(vmx);
3559 }
3560
3561 #undef R
3562 #undef Q
3563
3564 static void vmx_free_vmcs(struct kvm_vcpu *vcpu)
3565 {
3566         struct vcpu_vmx *vmx = to_vmx(vcpu);
3567
3568         if (vmx->vmcs) {
3569                 vcpu_clear(vmx);
3570                 free_vmcs(vmx->vmcs);
3571                 vmx->vmcs = NULL;
3572         }
3573 }
3574
3575 static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
3576 {
3577         struct vcpu_vmx *vmx = to_vmx(vcpu);
3578
3579         spin_lock(&vmx_vpid_lock);
3580         if (vmx->vpid != 0)
3581                 __clear_bit(vmx->vpid, vmx_vpid_bitmap);
3582         spin_unlock(&vmx_vpid_lock);
3583         vmx_free_vmcs(vcpu);
3584         kfree(vmx->host_msrs);
3585         kfree(vmx->guest_msrs);
3586         kvm_vcpu_uninit(vcpu);
3587         kmem_cache_free(kvm_vcpu_cache, vmx);
3588 }
3589
3590 static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
3591 {
3592         int err;
3593         struct vcpu_vmx *vmx = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
3594         int cpu;
3595
3596         if (!vmx)
3597                 return ERR_PTR(-ENOMEM);
3598
3599         allocate_vpid(vmx);
3600
3601         err = kvm_vcpu_init(&vmx->vcpu, kvm, id);
3602         if (err)
3603                 goto free_vcpu;
3604
3605         vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
3606         if (!vmx->guest_msrs) {
3607                 err = -ENOMEM;
3608                 goto uninit_vcpu;
3609         }
3610
3611         vmx->host_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
3612         if (!vmx->host_msrs)
3613                 goto free_guest_msrs;
3614
3615         vmx->vmcs = alloc_vmcs();
3616         if (!vmx->vmcs)
3617                 goto free_msrs;
3618
3619         vmcs_clear(vmx->vmcs);
3620
3621         cpu = get_cpu();
3622         vmx_vcpu_load(&vmx->vcpu, cpu);
3623         err = vmx_vcpu_setup(vmx);
3624         vmx_vcpu_put(&vmx->vcpu);
3625         put_cpu();
3626         if (err)
3627                 goto free_vmcs;
3628         if (vm_need_virtualize_apic_accesses(kvm))
3629                 if (alloc_apic_access_page(kvm) != 0)
3630                         goto free_vmcs;
3631
3632         if (vm_need_ept())
3633                 if (alloc_identity_pagetable(kvm) != 0)
3634                         goto free_vmcs;
3635
3636         return &vmx->vcpu;
3637
3638 free_vmcs:
3639         free_vmcs(vmx->vmcs);
3640 free_msrs:
3641         kfree(vmx->host_msrs);
3642 free_guest_msrs:
3643         kfree(vmx->guest_msrs);
3644 uninit_vcpu:
3645         kvm_vcpu_uninit(&vmx->vcpu);
3646 free_vcpu:
3647         kmem_cache_free(kvm_vcpu_cache, vmx);
3648         return ERR_PTR(err);
3649 }
3650
3651 static void __init vmx_check_processor_compat(void *rtn)
3652 {
3653         struct vmcs_config vmcs_conf;
3654
3655         *(int *)rtn = 0;
3656         if (setup_vmcs_config(&vmcs_conf) < 0)
3657                 *(int *)rtn = -EIO;
3658         if (memcmp(&vmcs_config, &vmcs_conf, sizeof(struct vmcs_config)) != 0) {
3659                 printk(KERN_ERR "kvm: CPU %d feature inconsistency!\n",
3660                                 smp_processor_id());
3661                 *(int *)rtn = -EIO;
3662         }
3663 }
3664
3665 static int get_ept_level(void)
3666 {
3667         return VMX_EPT_DEFAULT_GAW + 1;
3668 }
3669
3670 static int vmx_get_mt_mask_shift(void)
3671 {
3672         return VMX_EPT_MT_EPTE_SHIFT;
3673 }
3674
3675 static struct kvm_x86_ops vmx_x86_ops = {
3676         .cpu_has_kvm_support = cpu_has_kvm_support,
3677         .disabled_by_bios = vmx_disabled_by_bios,
3678         .hardware_setup = hardware_setup,
3679         .hardware_unsetup = hardware_unsetup,
3680         .check_processor_compatibility = vmx_check_processor_compat,
3681         .hardware_enable = hardware_enable,
3682         .hardware_disable = hardware_disable,
3683         .cpu_has_accelerated_tpr = cpu_has_vmx_virtualize_apic_accesses,
3684
3685         .vcpu_create = vmx_create_vcpu,
3686         .vcpu_free = vmx_free_vcpu,
3687         .vcpu_reset = vmx_vcpu_reset,
3688
3689         .prepare_guest_switch = vmx_save_host_state,
3690         .vcpu_load = vmx_vcpu_load,
3691         .vcpu_put = vmx_vcpu_put,
3692
3693         .set_guest_debug = set_guest_debug,
3694         .get_msr = vmx_get_msr,
3695         .set_msr = vmx_set_msr,
3696         .get_segment_base = vmx_get_segment_base,
3697         .get_segment = vmx_get_segment,
3698         .set_segment = vmx_set_segment,
3699         .get_cpl = vmx_get_cpl,
3700         .get_cs_db_l_bits = vmx_get_cs_db_l_bits,
3701         .decache_cr4_guest_bits = vmx_decache_cr4_guest_bits,
3702         .set_cr0 = vmx_set_cr0,
3703         .set_cr3 = vmx_set_cr3,
3704         .set_cr4 = vmx_set_cr4,
3705         .set_efer = vmx_set_efer,
3706         .get_idt = vmx_get_idt,
3707         .set_idt = vmx_set_idt,
3708         .get_gdt = vmx_get_gdt,
3709         .set_gdt = vmx_set_gdt,
3710         .cache_reg = vmx_cache_reg,
3711         .get_rflags = vmx_get_rflags,
3712         .set_rflags = vmx_set_rflags,
3713
3714         .tlb_flush = vmx_flush_tlb,
3715
3716         .run = vmx_vcpu_run,
3717         .handle_exit = kvm_handle_exit,
3718         .skip_emulated_instruction = skip_emulated_instruction,
3719         .patch_hypercall = vmx_patch_hypercall,
3720         .get_irq = vmx_get_irq,
3721         .set_irq = vmx_inject_irq,
3722         .queue_exception = vmx_queue_exception,
3723         .exception_injected = vmx_exception_injected,
3724         .inject_pending_irq = vmx_intr_assist,
3725         .inject_pending_vectors = do_interrupt_requests,
3726
3727         .set_tss_addr = vmx_set_tss_addr,
3728         .get_tdp_level = get_ept_level,
3729         .get_mt_mask_shift = vmx_get_mt_mask_shift,
3730 };
3731
3732 static int __init vmx_init(void)
3733 {
3734         void *va;
3735         int r;
3736
3737         vmx_io_bitmap_a = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
3738         if (!vmx_io_bitmap_a)
3739                 return -ENOMEM;
3740
3741         vmx_io_bitmap_b = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
3742         if (!vmx_io_bitmap_b) {
3743                 r = -ENOMEM;
3744                 goto out;
3745         }
3746
3747         vmx_msr_bitmap = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
3748         if (!vmx_msr_bitmap) {
3749                 r = -ENOMEM;
3750                 goto out1;
3751         }
3752
3753         /*
3754          * Allow direct access to the PC debug port (it is often used for I/O
3755          * delays, but the vmexits simply slow things down).
3756          */
3757         va = kmap(vmx_io_bitmap_a);
3758         memset(va, 0xff, PAGE_SIZE);
3759         clear_bit(0x80, va);
3760         kunmap(vmx_io_bitmap_a);
3761
3762         va = kmap(vmx_io_bitmap_b);
3763         memset(va, 0xff, PAGE_SIZE);
3764         kunmap(vmx_io_bitmap_b);
3765
3766         va = kmap(vmx_msr_bitmap);
3767         memset(va, 0xff, PAGE_SIZE);
3768         kunmap(vmx_msr_bitmap);
3769
3770         set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */
3771
3772         r = kvm_init(&vmx_x86_ops, sizeof(struct vcpu_vmx), THIS_MODULE);
3773         if (r)
3774                 goto out2;
3775
3776         vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_FS_BASE);
3777         vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_GS_BASE);
3778         vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_IA32_SYSENTER_CS);
3779         vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_IA32_SYSENTER_ESP);
3780         vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_IA32_SYSENTER_EIP);
3781
3782         if (vm_need_ept()) {
3783                 bypass_guest_pf = 0;
3784                 kvm_mmu_set_base_ptes(VMX_EPT_READABLE_MASK |
3785                         VMX_EPT_WRITABLE_MASK);
3786                 kvm_mmu_set_mask_ptes(0ull, 0ull, 0ull, 0ull,
3787                                 VMX_EPT_EXECUTABLE_MASK,
3788                                 VMX_EPT_DEFAULT_MT << VMX_EPT_MT_EPTE_SHIFT);
3789                 kvm_enable_tdp();
3790         } else
3791                 kvm_disable_tdp();
3792
3793         if (bypass_guest_pf)
3794                 kvm_mmu_set_nonpresent_ptes(~0xffeull, 0ull);
3795
3796         ept_sync_global();
3797
3798         return 0;
3799
3800 out2:
3801         __free_page(vmx_msr_bitmap);
3802 out1:
3803         __free_page(vmx_io_bitmap_b);
3804 out:
3805         __free_page(vmx_io_bitmap_a);
3806         return r;
3807 }
3808
3809 static void __exit vmx_exit(void)
3810 {
3811         __free_page(vmx_msr_bitmap);
3812         __free_page(vmx_io_bitmap_b);
3813         __free_page(vmx_io_bitmap_a);
3814
3815         kvm_exit();
3816 }
3817
3818 module_init(vmx_init)
3819 module_exit(vmx_exit)