arch/x86/kvm/x86.c

   1 /*
   2  * Kernel-based Virtual Machine driver for Linux
   3  *
   4  * derived from drivers/kvm/kvm_main.c
   5  *
   6  * Copyright (C) 2006 Qumranet, Inc.
   7  *
   8  * Authors:
   9  *   Avi Kivity   <avi@qumranet.com>
  10  *   Yaniv Kamay  <yaniv@qumranet.com>
  11  *
  12  * This work is licensed under the terms of the GNU GPL, version 2.  See
  13  * the COPYING file in the top-level directory.
  14  *
  15  */
  16
  17 #include <linux/kvm_host.h>
  18 #include "irq.h"
  19 #include "mmu.h"
  20 #include "i8254.h"
  21 #include "tss.h"
  22
  23 #include <linux/clocksource.h>
  24 #include <linux/kvm.h>
  25 #include <linux/fs.h>
  26 #include <linux/vmalloc.h>
  27 #include <linux/module.h>
  28 #include <linux/mman.h>
  29 #include <linux/highmem.h>
  30
  31 #include <asm/uaccess.h>
  32 #include <asm/msr.h>
  33 #include <asm/desc.h>
  34
  35 #define MAX_IO_MSRS 256
  36 #define CR0_RESERVED_BITS                                               \
  37         (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
  38                           | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
  39                           | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))
  40 #define CR4_RESERVED_BITS                                               \
  41         (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
  42                           | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE     \
  43                           | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR  \
  44                           | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
  45
  46 #define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
  47 /* EFER defaults:
  48  * - enable syscall per default because its emulated by KVM
  49  * - enable LME and LMA per default on 64 bit KVM
  50  */
  51 #ifdef CONFIG_X86_64
  52 static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffafeULL;
  53 #else
  54 static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffffeULL;
  55 #endif
  56
  57 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
  58 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
  59
  60 static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
  61                                     struct kvm_cpuid_entry2 __user *entries);
  62
  63 struct kvm_x86_ops *kvm_x86_ops;
  64
  65 struct kvm_stats_debugfs_item debugfs_entries[] = {
  66         { "pf_fixed", VCPU_STAT(pf_fixed) },
  67         { "pf_guest", VCPU_STAT(pf_guest) },
  68         { "tlb_flush", VCPU_STAT(tlb_flush) },
  69         { "invlpg", VCPU_STAT(invlpg) },
  70         { "exits", VCPU_STAT(exits) },
  71         { "io_exits", VCPU_STAT(io_exits) },
  72         { "mmio_exits", VCPU_STAT(mmio_exits) },
  73         { "signal_exits", VCPU_STAT(signal_exits) },
  74         { "irq_window", VCPU_STAT(irq_window_exits) },
  75         { "nmi_window", VCPU_STAT(nmi_window_exits) },
  76         { "halt_exits", VCPU_STAT(halt_exits) },
  77         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
  78         { "hypercalls", VCPU_STAT(hypercalls) },
  79         { "request_irq", VCPU_STAT(request_irq_exits) },
  80         { "irq_exits", VCPU_STAT(irq_exits) },
  81         { "host_state_reload", VCPU_STAT(host_state_reload) },
  82         { "efer_reload", VCPU_STAT(efer_reload) },
  83         { "fpu_reload", VCPU_STAT(fpu_reload) },
  84         { "insn_emulation", VCPU_STAT(insn_emulation) },
  85         { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
  86         { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
  87         { "mmu_pte_write", VM_STAT(mmu_pte_write) },
  88         { "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
  89         { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
  90         { "mmu_flooded", VM_STAT(mmu_flooded) },
  91         { "mmu_recycled", VM_STAT(mmu_recycled) },
  92         { "mmu_cache_miss", VM_STAT(mmu_cache_miss) },
  93         { "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
  94         { "largepages", VM_STAT(lpages) },
  95         { NULL }
  96 };
  97
  98
  99 unsigned long segment_base(u16 selector)
 100 {
 101         struct descriptor_table gdt;
 102         struct desc_struct *d;
 103         unsigned long table_base;
 104         unsigned long v;
 105
 106         if (selector == 0)
 107                 return 0;
 108
 109         asm("sgdt %0" : "=m"(gdt));
 110         table_base = gdt.base;
 111
 112         if (selector & 4) {           /* from ldt */
 113                 u16 ldt_selector;
 114
 115                 asm("sldt %0" : "=g"(ldt_selector));
 116                 table_base = segment_base(ldt_selector);
 117         }
 118         d = (struct desc_struct *)(table_base + (selector & ~7));
 119         v = d->base0 | ((unsigned long)d->base1 << 16) |
 120                 ((unsigned long)d->base2 << 24);
 121 #ifdef CONFIG_X86_64
 122         if (d->s == 0 && (d->type == 2 || d->type == 9 || d->type == 11))
 123                 v |= ((unsigned long)((struct ldttss_desc64 *)d)->base3) << 32;
 124 #endif
 125         return v;
 126 }
 127 EXPORT_SYMBOL_GPL(segment_base);
 128
 129 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
 130 {
 131         if (irqchip_in_kernel(vcpu->kvm))
 132                 return vcpu->arch.apic_base;
 133         else
 134                 return vcpu->arch.apic_base;
 135 }
 136 EXPORT_SYMBOL_GPL(kvm_get_apic_base);
 137
 138 void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
 139 {
 140         /* TODO: reserve bits check */
 141         if (irqchip_in_kernel(vcpu->kvm))
 142                 kvm_lapic_set_base(vcpu, data);
 143         else
 144                 vcpu->arch.apic_base = data;
 145 }
 146 EXPORT_SYMBOL_GPL(kvm_set_apic_base);
 147
 148 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
 149 {
 150         WARN_ON(vcpu->arch.exception.pending);
 151         vcpu->arch.exception.pending = true;
 152         vcpu->arch.exception.has_error_code = false;
 153         vcpu->arch.exception.nr = nr;
 154 }
 155 EXPORT_SYMBOL_GPL(kvm_queue_exception);
 156
 157 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long addr,
 158                            u32 error_code)
 159 {
 160         ++vcpu->stat.pf_guest;
 161         if (vcpu->arch.exception.pending) {
 162                 if (vcpu->arch.exception.nr == PF_VECTOR) {
 163                         printk(KERN_DEBUG "kvm: inject_page_fault:"
 164                                         " double fault 0x%lx\n", addr);
 165                         vcpu->arch.exception.nr = DF_VECTOR;
 166                         vcpu->arch.exception.error_code = 0;
 167                 } else if (vcpu->arch.exception.nr == DF_VECTOR) {
 168                         /* triple fault -> shutdown */
 169                         set_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests);
 170                 }
 171                 return;
 172         }
 173         vcpu->arch.cr2 = addr;
 174         kvm_queue_exception_e(vcpu, PF_VECTOR, error_code);
 175 }
 176
 177 void kvm_inject_nmi(struct kvm_vcpu *vcpu)
 178 {
 179         vcpu->arch.nmi_pending = 1;
 180 }
 181 EXPORT_SYMBOL_GPL(kvm_inject_nmi);
 182
 183 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
 184 {
 185         WARN_ON(vcpu->arch.exception.pending);
 186         vcpu->arch.exception.pending = true;
 187         vcpu->arch.exception.has_error_code = true;
 188         vcpu->arch.exception.nr = nr;
 189         vcpu->arch.exception.error_code = error_code;
 190 }
 191 EXPORT_SYMBOL_GPL(kvm_queue_exception_e);
 192
 193 static void __queue_exception(struct kvm_vcpu *vcpu)
 194 {
 195         kvm_x86_ops->queue_exception(vcpu, vcpu->arch.exception.nr,
 196                                      vcpu->arch.exception.has_error_code,
 197                                      vcpu->arch.exception.error_code);
 198 }
 199
 200 /*
 201  * Load the pae pdptrs.  Return true is they are all valid.
 202  */
 203 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
 204 {
 205         gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
 206         unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
 207         int i;
 208         int ret;
 209         u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
 210
 211         ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte,
 212                                   offset * sizeof(u64), sizeof(pdpte));
 213         if (ret < 0) {
 214                 ret = 0;
 215                 goto out;
 216         }
 217         for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
 218                 if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) {
 219                         ret = 0;
 220                         goto out;
 221                 }
 222         }
 223         ret = 1;
 224
 225         memcpy(vcpu->arch.pdptrs, pdpte, sizeof(vcpu->arch.pdptrs));
 226 out:
 227
 228         return ret;
 229 }
 230 EXPORT_SYMBOL_GPL(load_pdptrs);
 231
 232 static bool pdptrs_changed(struct kvm_vcpu *vcpu)
 233 {
 234         u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
 235         bool changed = true;
 236         int r;
 237
 238         if (is_long_mode(vcpu) || !is_pae(vcpu))
 239                 return false;
 240
 241         r = kvm_read_guest(vcpu->kvm, vcpu->arch.cr3 & ~31u, pdpte, sizeof(pdpte));
 242         if (r < 0)
 243                 goto out;
 244         changed = memcmp(pdpte, vcpu->arch.pdptrs, sizeof(pdpte)) != 0;
 245 out:
 246
 247         return changed;
 248 }
 249
 250 void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 251 {
 252         if (cr0 & CR0_RESERVED_BITS) {
 253                 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
 254                        cr0, vcpu->arch.cr0);
 255                 kvm_inject_gp(vcpu, 0);
 256                 return;
 257         }
 258
 259         if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) {
 260                 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
 261                 kvm_inject_gp(vcpu, 0);
 262                 return;
 263         }
 264
 265         if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) {
 266                 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
 267                        "and a clear PE flag\n");
 268                 kvm_inject_gp(vcpu, 0);
 269                 return;
 270         }
 271
 272         if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
 273 #ifdef CONFIG_X86_64
 274                 if ((vcpu->arch.shadow_efer & EFER_LME)) {
 275                         int cs_db, cs_l;
 276
 277                         if (!is_pae(vcpu)) {
 278                                 printk(KERN_DEBUG "set_cr0: #GP, start paging "
 279                                        "in long mode while PAE is disabled\n");
 280                                 kvm_inject_gp(vcpu, 0);
 281                                 return;
 282                         }
 283                         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
 284                         if (cs_l) {
 285                                 printk(KERN_DEBUG "set_cr0: #GP, start paging "
 286                                        "in long mode while CS.L == 1\n");
 287                                 kvm_inject_gp(vcpu, 0);
 288                                 return;
 289
 290                         }
 291                 } else
 292 #endif
 293                 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.cr3)) {
 294                         printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
 295                                "reserved bits\n");
 296                         kvm_inject_gp(vcpu, 0);
 297                         return;
 298                 }
 299
 300         }
 301
 302         kvm_x86_ops->set_cr0(vcpu, cr0);
 303         vcpu->arch.cr0 = cr0;
 304
 305         kvm_mmu_reset_context(vcpu);
 306         return;
 307 }
 308 EXPORT_SYMBOL_GPL(kvm_set_cr0);
 309
 310 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
 311 {
 312         kvm_set_cr0(vcpu, (vcpu->arch.cr0 & ~0x0ful) | (msw & 0x0f));
 313         KVMTRACE_1D(LMSW, vcpu,
 314                     (u32)((vcpu->arch.cr0 & ~0x0ful) | (msw & 0x0f)),
 315                     handler);
 316 }
 317 EXPORT_SYMBOL_GPL(kvm_lmsw);
 318
 319 void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
 320 {
 321         if (cr4 & CR4_RESERVED_BITS) {
 322                 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
 323                 kvm_inject_gp(vcpu, 0);
 324                 return;
 325         }
 326
 327         if (is_long_mode(vcpu)) {
 328                 if (!(cr4 & X86_CR4_PAE)) {
 329                         printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
 330                                "in long mode\n");
 331                         kvm_inject_gp(vcpu, 0);
 332                         return;
 333                 }
 334         } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & X86_CR4_PAE)
 335                    && !load_pdptrs(vcpu, vcpu->arch.cr3)) {
 336                 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
 337                 kvm_inject_gp(vcpu, 0);
 338                 return;
 339         }
 340
 341         if (cr4 & X86_CR4_VMXE) {
 342                 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
 343                 kvm_inject_gp(vcpu, 0);
 344                 return;
 345         }
 346         kvm_x86_ops->set_cr4(vcpu, cr4);
 347         vcpu->arch.cr4 = cr4;
 348         kvm_mmu_reset_context(vcpu);
 349 }
 350 EXPORT_SYMBOL_GPL(kvm_set_cr4);
 351
 352 void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
 353 {
 354         if (cr3 == vcpu->arch.cr3 && !pdptrs_changed(vcpu)) {
 355                 kvm_mmu_flush_tlb(vcpu);
 356                 return;
 357         }
 358
 359         if (is_long_mode(vcpu)) {
 360                 if (cr3 & CR3_L_MODE_RESERVED_BITS) {
 361                         printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
 362                         kvm_inject_gp(vcpu, 0);
 363                         return;
 364                 }
 365         } else {
 366                 if (is_pae(vcpu)) {
 367                         if (cr3 & CR3_PAE_RESERVED_BITS) {
 368                                 printk(KERN_DEBUG
 369                                        "set_cr3: #GP, reserved bits\n");
 370                                 kvm_inject_gp(vcpu, 0);
 371                                 return;
 372                         }
 373                         if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) {
 374                                 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
 375                                        "reserved bits\n");
 376                                 kvm_inject_gp(vcpu, 0);
 377                                 return;
 378                         }
 379                 }
 380                 /*
 381                  * We don't check reserved bits in nonpae mode, because
 382                  * this isn't enforced, and VMware depends on this.
 383                  */
 384         }
 385
 386         /*
 387          * Does the new cr3 value map to physical memory? (Note, we
 388          * catch an invalid cr3 even in real-mode, because it would
 389          * cause trouble later on when we turn on paging anyway.)
 390          *
 391          * A real CPU would silently accept an invalid cr3 and would
 392          * attempt to use it - with largely undefined (and often hard
 393          * to debug) behavior on the guest side.
 394          */
 395         if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
 396                 kvm_inject_gp(vcpu, 0);
 397         else {
 398                 vcpu->arch.cr3 = cr3;
 399                 vcpu->arch.mmu.new_cr3(vcpu);
 400         }
 401 }
 402 EXPORT_SYMBOL_GPL(kvm_set_cr3);
 403
 404 void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
 405 {
 406         if (cr8 & CR8_RESERVED_BITS) {
 407                 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
 408                 kvm_inject_gp(vcpu, 0);
 409                 return;
 410         }
 411         if (irqchip_in_kernel(vcpu->kvm))
 412                 kvm_lapic_set_tpr(vcpu, cr8);
 413         else
 414                 vcpu->arch.cr8 = cr8;
 415 }
 416 EXPORT_SYMBOL_GPL(kvm_set_cr8);
 417
 418 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu)
 419 {
 420         if (irqchip_in_kernel(vcpu->kvm))
 421                 return kvm_lapic_get_cr8(vcpu);
 422         else
 423                 return vcpu->arch.cr8;
 424 }
 425 EXPORT_SYMBOL_GPL(kvm_get_cr8);
 426
 427 /*
 428  * List of msr numbers which we expose to userspace through KVM_GET_MSRS
 429  * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
 430  *
 431  * This list is modified at module load time to reflect the
 432  * capabilities of the host cpu.
 433  */
 434 static u32 msrs_to_save[] = {
 435         MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
 436         MSR_K6_STAR,
 437 #ifdef CONFIG_X86_64
 438         MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
 439 #endif
 440         MSR_IA32_TIME_STAMP_COUNTER, MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
 441         MSR_IA32_PERF_STATUS,
 442 };
 443
 444 static unsigned num_msrs_to_save;
 445
 446 static u32 emulated_msrs[] = {
 447         MSR_IA32_MISC_ENABLE,
 448 };
 449
 450 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
 451 {
 452         if (efer & efer_reserved_bits) {
 453                 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
 454                        efer);
 455                 kvm_inject_gp(vcpu, 0);
 456                 return;
 457         }
 458
 459         if (is_paging(vcpu)
 460             && (vcpu->arch.shadow_efer & EFER_LME) != (efer & EFER_LME)) {
 461                 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
 462                 kvm_inject_gp(vcpu, 0);
 463                 return;
 464         }
 465
 466         kvm_x86_ops->set_efer(vcpu, efer);
 467
 468         efer &= ~EFER_LMA;
 469         efer |= vcpu->arch.shadow_efer & EFER_LMA;
 470
 471         vcpu->arch.shadow_efer = efer;
 472 }
 473
 474 void kvm_enable_efer_bits(u64 mask)
 475 {
 476        efer_reserved_bits &= ~mask;
 477 }
 478 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);
 479
 480
 481 /*
 482  * Writes msr value into into the appropriate "register".
 483  * Returns 0 on success, non-0 otherwise.
 484  * Assumes vcpu_load() was already called.
 485  */
 486 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
 487 {
 488         return kvm_x86_ops->set_msr(vcpu, msr_index, data);
 489 }
 490
 491 /*
 492  * Adapt set_msr() to msr_io()'s calling convention
 493  */
 494 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
 495 {
 496         return kvm_set_msr(vcpu, index, *data);
 497 }
 498
 499 static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
 500 {
 501         static int version;
 502         struct pvclock_wall_clock wc;
 503         struct timespec now, sys, boot;
 504
 505         if (!wall_clock)
 506                 return;
 507
 508         version++;
 509
 510         kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
 511
 512         /*
 513          * The guest calculates current wall clock time by adding
 514          * system time (updated by kvm_write_guest_time below) to the
 515          * wall clock specified here.  guest system time equals host
 516          * system time for us, thus we must fill in host boot time here.
 517          */
 518         now = current_kernel_time();
 519         ktime_get_ts(&sys);
 520         boot = ns_to_timespec(timespec_to_ns(&now) - timespec_to_ns(&sys));
 521
 522         wc.sec = boot.tv_sec;
 523         wc.nsec = boot.tv_nsec;
 524         wc.version = version;
 525
 526         kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc));
 527
 528         version++;
 529         kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
 530 }
 531
 532 static uint32_t div_frac(uint32_t dividend, uint32_t divisor)
 533 {
 534         uint32_t quotient, remainder;
 535
 536         /* Don't try to replace with do_div(), this one calculates
 537          * "(dividend << 32) / divisor" */
 538         __asm__ ( "divl %4"
 539                   : "=a" (quotient), "=d" (remainder)
 540                   : "0" (0), "1" (dividend), "r" (divisor) );
 541         return quotient;
 542 }
 543
 544 static void kvm_set_time_scale(uint32_t tsc_khz, struct pvclock_vcpu_time_info *hv_clock)
 545 {
 546         uint64_t nsecs = 1000000000LL;
 547         int32_t  shift = 0;
 548         uint64_t tps64;
 549         uint32_t tps32;
 550
 551         tps64 = tsc_khz * 1000LL;
 552         while (tps64 > nsecs*2) {
 553                 tps64 >>= 1;
 554                 shift--;
 555         }
 556
 557         tps32 = (uint32_t)tps64;
 558         while (tps32 <= (uint32_t)nsecs) {
 559                 tps32 <<= 1;
 560                 shift++;
 561         }
 562
 563         hv_clock->tsc_shift = shift;
 564         hv_clock->tsc_to_system_mul = div_frac(nsecs, tps32);
 565
 566         pr_debug("%s: tsc_khz %u, tsc_shift %d, tsc_mul %u\n",
 567                  __FUNCTION__, tsc_khz, hv_clock->tsc_shift,
 568                  hv_clock->tsc_to_system_mul);
 569 }
 570
 571 static void kvm_write_guest_time(struct kvm_vcpu *v)
 572 {
 573         struct timespec ts;
 574         unsigned long flags;
 575         struct kvm_vcpu_arch *vcpu = &v->arch;
 576         void *shared_kaddr;
 577
 578         if ((!vcpu->time_page))
 579                 return;
 580
 581         if (unlikely(vcpu->hv_clock_tsc_khz != tsc_khz)) {
 582                 kvm_set_time_scale(tsc_khz, &vcpu->hv_clock);
 583                 vcpu->hv_clock_tsc_khz = tsc_khz;
 584         }
 585
 586         /* Keep irq disabled to prevent changes to the clock */
 587         local_irq_save(flags);
 588         kvm_get_msr(v, MSR_IA32_TIME_STAMP_COUNTER,
 589                           &vcpu->hv_clock.tsc_timestamp);
 590         ktime_get_ts(&ts);
 591         local_irq_restore(flags);
 592
 593         /* With all the info we got, fill in the values */
 594
 595         vcpu->hv_clock.system_time = ts.tv_nsec +
 596                                      (NSEC_PER_SEC * (u64)ts.tv_sec);
 597         /*
 598          * The interface expects us to write an even number signaling that the
 599          * update is finished. Since the guest won't see the intermediate
 600          * state, we just increase by 2 at the end.
 601          */
 602         vcpu->hv_clock.version += 2;
 603
 604         shared_kaddr = kmap_atomic(vcpu->time_page, KM_USER0);
 605
 606         memcpy(shared_kaddr + vcpu->time_offset, &vcpu->hv_clock,
 607                sizeof(vcpu->hv_clock));
 608
 609         kunmap_atomic(shared_kaddr, KM_USER0);
 610
 611         mark_page_dirty(v->kvm, vcpu->time >> PAGE_SHIFT);
 612 }
 613
 614 static bool msr_mtrr_valid(unsigned msr)
 615 {
 616         switch (msr) {
 617         case 0x200 ... 0x200 + 2 * KVM_NR_VAR_MTRR - 1:
 618         case MSR_MTRRfix64K_00000:
 619         case MSR_MTRRfix16K_80000:
 620         case MSR_MTRRfix16K_A0000:
 621         case MSR_MTRRfix4K_C0000:
 622         case MSR_MTRRfix4K_C8000:
 623         case MSR_MTRRfix4K_D0000:
 624         case MSR_MTRRfix4K_D8000:
 625         case MSR_MTRRfix4K_E0000:
 626         case MSR_MTRRfix4K_E8000:
 627         case MSR_MTRRfix4K_F0000:
 628         case MSR_MTRRfix4K_F8000:
 629         case MSR_MTRRdefType:
 630         case MSR_IA32_CR_PAT:
 631                 return true;
 632         case 0x2f8:
 633                 return true;
 634         }
 635         return false;
 636 }
 637
 638 static int set_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
 639 {
 640         if (!msr_mtrr_valid(msr))
 641                 return 1;
 642
 643         vcpu->arch.mtrr[msr - 0x200] = data;
 644         return 0;
 645 }
 646
 647 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
 648 {
 649         switch (msr) {
 650         case MSR_EFER:
 651                 set_efer(vcpu, data);
 652                 break;
 653         case MSR_IA32_MC0_STATUS:
 654                 pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
 655                        __func__, data);
 656                 break;
 657         case MSR_IA32_MCG_STATUS:
 658                 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
 659                         __func__, data);
 660                 break;
 661         case MSR_IA32_MCG_CTL:
 662                 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_CTL 0x%llx, nop\n",
 663                         __func__, data);
 664                 break;
 665         case MSR_IA32_UCODE_REV:
 666         case MSR_IA32_UCODE_WRITE:
 667                 break;
 668         case 0x200 ... 0x2ff:
 669                 return set_msr_mtrr(vcpu, msr, data);
 670         case MSR_IA32_APICBASE:
 671                 kvm_set_apic_base(vcpu, data);
 672                 break;
 673         case MSR_IA32_MISC_ENABLE:
 674                 vcpu->arch.ia32_misc_enable_msr = data;
 675                 break;
 676         case MSR_KVM_WALL_CLOCK:
 677                 vcpu->kvm->arch.wall_clock = data;
 678                 kvm_write_wall_clock(vcpu->kvm, data);
 679                 break;
 680         case MSR_KVM_SYSTEM_TIME: {
 681                 if (vcpu->arch.time_page) {
 682                         kvm_release_page_dirty(vcpu->arch.time_page);
 683                         vcpu->arch.time_page = NULL;
 684                 }
 685
 686                 vcpu->arch.time = data;
 687
 688                 /* we verify if the enable bit is set... */
 689                 if (!(data & 1))
 690                         break;
 691
 692                 /* ...but clean it before doing the actual write */
 693                 vcpu->arch.time_offset = data & ~(PAGE_MASK | 1);
 694
 695                 down_read(&current->mm->mmap_sem);
 696                 vcpu->arch.time_page =
 697                                 gfn_to_page(vcpu->kvm, data >> PAGE_SHIFT);
 698                 up_read(&current->mm->mmap_sem);
 699
 700                 if (is_error_page(vcpu->arch.time_page)) {
 701                         kvm_release_page_clean(vcpu->arch.time_page);
 702                         vcpu->arch.time_page = NULL;
 703                 }
 704
 705                 kvm_write_guest_time(vcpu);
 706                 break;
 707         }
 708         default:
 709                 pr_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n", msr, data);
 710                 return 1;
 711         }
 712         return 0;
 713 }
 714 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
 715
 716
 717 /*
 718  * Reads an msr value (of 'msr_index') into 'pdata'.
 719  * Returns 0 on success, non-0 otherwise.
 720  * Assumes vcpu_load() was already called.
 721  */
 722 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
 723 {
 724         return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
 725 }
 726
 727 static int get_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
 728 {
 729         if (!msr_mtrr_valid(msr))
 730                 return 1;
 731
 732         *pdata = vcpu->arch.mtrr[msr - 0x200];
 733         return 0;
 734 }
 735
 736 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
 737 {
 738         u64 data;
 739
 740         switch (msr) {
 741         case 0xc0010010: /* SYSCFG */
 742         case 0xc0010015: /* HWCR */
 743         case MSR_IA32_PLATFORM_ID:
 744         case MSR_IA32_P5_MC_ADDR:
 745         case MSR_IA32_P5_MC_TYPE:
 746         case MSR_IA32_MC0_CTL:
 747         case MSR_IA32_MCG_STATUS:
 748         case MSR_IA32_MCG_CAP:
 749         case MSR_IA32_MCG_CTL:
 750         case MSR_IA32_MC0_MISC:
 751         case MSR_IA32_MC0_MISC+4:
 752         case MSR_IA32_MC0_MISC+8:
 753         case MSR_IA32_MC0_MISC+12:
 754         case MSR_IA32_MC0_MISC+16:
 755         case MSR_IA32_UCODE_REV:
 756         case MSR_IA32_EBL_CR_POWERON:
 757                 data = 0;
 758                 break;
 759         case MSR_MTRRcap:
 760                 data = 0x500 | KVM_NR_VAR_MTRR;
 761                 break;
 762         case 0x200 ... 0x2ff:
 763                 return get_msr_mtrr(vcpu, msr, pdata);
 764         case 0xcd: /* fsb frequency */
 765                 data = 3;
 766                 break;
 767         case MSR_IA32_APICBASE:
 768                 data = kvm_get_apic_base(vcpu);
 769                 break;
 770         case MSR_IA32_MISC_ENABLE:
 771                 data = vcpu->arch.ia32_misc_enable_msr;
 772                 break;
 773         case MSR_IA32_PERF_STATUS:
 774                 /* TSC increment by tick */
 775                 data = 1000ULL;
 776                 /* CPU multiplier */
 777                 data |= (((uint64_t)4ULL) << 40);
 778                 break;
 779         case MSR_EFER:
 780                 data = vcpu->arch.shadow_efer;
 781                 break;
 782         case MSR_KVM_WALL_CLOCK:
 783                 data = vcpu->kvm->arch.wall_clock;
 784                 break;
 785         case MSR_KVM_SYSTEM_TIME:
 786                 data = vcpu->arch.time;
 787                 break;
 788         default:
 789                 pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
 790                 return 1;
 791         }
 792         *pdata = data;
 793         return 0;
 794 }
 795 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
 796
 797 /*
 798  * Read or write a bunch of msrs. All parameters are kernel addresses.
 799  *
 800  * @return number of msrs set successfully.
 801  */
 802 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
 803                     struct kvm_msr_entry *entries,
 804                     int (*do_msr)(struct kvm_vcpu *vcpu,
 805                                   unsigned index, u64 *data))
 806 {
 807         int i;
 808
 809         vcpu_load(vcpu);
 810
 811         down_read(&vcpu->kvm->slots_lock);
 812         for (i = 0; i < msrs->nmsrs; ++i)
 813                 if (do_msr(vcpu, entries[i].index, &entries[i].data))
 814                         break;
 815         up_read(&vcpu->kvm->slots_lock);
 816
 817         vcpu_put(vcpu);
 818
 819         return i;
 820 }
 821
 822 /*
 823  * Read or write a bunch of msrs. Parameters are user addresses.
 824  *
 825  * @return number of msrs set successfully.
 826  */
 827 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
 828                   int (*do_msr)(struct kvm_vcpu *vcpu,
 829                                 unsigned index, u64 *data),
 830                   int writeback)
 831 {
 832         struct kvm_msrs msrs;
 833         struct kvm_msr_entry *entries;
 834         int r, n;
 835         unsigned size;
 836
 837         r = -EFAULT;
 838         if (copy_from_user(&msrs, user_msrs, sizeof msrs))
 839                 goto out;
 840
 841         r = -E2BIG;
 842         if (msrs.nmsrs >= MAX_IO_MSRS)
 843                 goto out;
 844
 845         r = -ENOMEM;
 846         size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
 847         entries = vmalloc(size);
 848         if (!entries)
 849                 goto out;
 850
 851         r = -EFAULT;
 852         if (copy_from_user(entries, user_msrs->entries, size))
 853                 goto out_free;
 854
 855         r = n = __msr_io(vcpu, &msrs, entries, do_msr);
 856         if (r < 0)
 857                 goto out_free;
 858
 859         r = -EFAULT;
 860         if (writeback && copy_to_user(user_msrs->entries, entries, size))
 861                 goto out_free;
 862
 863         r = n;
 864
 865 out_free:
 866         vfree(entries);
 867 out:
 868         return r;
 869 }
 870
 871 int kvm_dev_ioctl_check_extension(long ext)
 872 {
 873         int r;
 874
 875         switch (ext) {
 876         case KVM_CAP_IRQCHIP:
 877         case KVM_CAP_HLT:
 878         case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
 879         case KVM_CAP_USER_MEMORY:
 880         case KVM_CAP_SET_TSS_ADDR:
 881         case KVM_CAP_EXT_CPUID:
 882         case KVM_CAP_CLOCKSOURCE:
 883         case KVM_CAP_PIT:
 884         case KVM_CAP_NOP_IO_DELAY:
 885         case KVM_CAP_MP_STATE:
 886                 r = 1;
 887                 break;
 888         case KVM_CAP_VAPIC:
 889                 r = !kvm_x86_ops->cpu_has_accelerated_tpr();
 890                 break;
 891         case KVM_CAP_NR_VCPUS:
 892                 r = KVM_MAX_VCPUS;
 893                 break;
 894         case KVM_CAP_NR_MEMSLOTS:
 895                 r = KVM_MEMORY_SLOTS;
 896                 break;
 897         case KVM_CAP_PV_MMU:
 898                 r = !tdp_enabled;
 899                 break;
 900         default:
 901                 r = 0;
 902                 break;
 903         }
 904         return r;
 905
 906 }
 907
 908 long kvm_arch_dev_ioctl(struct file *filp,
 909                         unsigned int ioctl, unsigned long arg)
 910 {
 911         void __user *argp = (void __user *)arg;
 912         long r;
 913
 914         switch (ioctl) {
 915         case KVM_GET_MSR_INDEX_LIST: {
 916                 struct kvm_msr_list __user *user_msr_list = argp;
 917                 struct kvm_msr_list msr_list;
 918                 unsigned n;
 919
 920                 r = -EFAULT;
 921                 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
 922                         goto out;
 923                 n = msr_list.nmsrs;
 924                 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
 925                 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
 926                         goto out;
 927                 r = -E2BIG;
 928                 if (n < num_msrs_to_save)
 929                         goto out;
 930                 r = -EFAULT;
 931                 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
 932                                  num_msrs_to_save * sizeof(u32)))
 933                         goto out;
 934                 if (copy_to_user(user_msr_list->indices
 935                                  + num_msrs_to_save * sizeof(u32),
 936                                  &emulated_msrs,
 937                                  ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
 938                         goto out;
 939                 r = 0;
 940                 break;
 941         }
 942         case KVM_GET_SUPPORTED_CPUID: {
 943                 struct kvm_cpuid2 __user *cpuid_arg = argp;
 944                 struct kvm_cpuid2 cpuid;
 945
 946                 r = -EFAULT;
 947                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
 948                         goto out;
 949                 r = kvm_dev_ioctl_get_supported_cpuid(&cpuid,
 950                         cpuid_arg->entries);
 951                 if (r)
 952                         goto out;
 953
 954                 r = -EFAULT;
 955                 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
 956                         goto out;
 957                 r = 0;
 958                 break;
 959         }
 960         default:
 961                 r = -EINVAL;
 962         }
 963 out:
 964         return r;
 965 }
 966
 967 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 968 {
 969         kvm_x86_ops->vcpu_load(vcpu, cpu);
 970         kvm_write_guest_time(vcpu);
 971 }
 972
 973 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 974 {
 975         kvm_x86_ops->vcpu_put(vcpu);
 976         kvm_put_guest_fpu(vcpu);
 977 }
 978
 979 static int is_efer_nx(void)
 980 {
 981         u64 efer;
 982
 983         rdmsrl(MSR_EFER, efer);
 984         return efer & EFER_NX;
 985 }
 986
 987 static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
 988 {
 989         int i;
 990         struct kvm_cpuid_entry2 *e, *entry;
 991
 992         entry = NULL;
 993         for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
 994                 e = &vcpu->arch.cpuid_entries[i];
 995                 if (e->function == 0x80000001) {
 996                         entry = e;
 997                         break;
 998                 }
 999         }
1000         if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) {
1001                 entry->edx &= ~(1 << 20);
1002                 printk(KERN_INFO "kvm: guest NX capability removed\n");
1003         }
1004 }
1005
1006 /* when an old userspace process fills a new kernel module */
1007 static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
1008                                     struct kvm_cpuid *cpuid,
1009                                     struct kvm_cpuid_entry __user *entries)
1010 {
1011         int r, i;
1012         struct kvm_cpuid_entry *cpuid_entries;
1013
1014         r = -E2BIG;
1015         if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
1016                 goto out;
1017         r = -ENOMEM;
1018         cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent);
1019         if (!cpuid_entries)
1020                 goto out;
1021         r = -EFAULT;
1022         if (copy_from_user(cpuid_entries, entries,
1023                            cpuid->nent * sizeof(struct kvm_cpuid_entry)))
1024                 goto out_free;
1025         for (i = 0; i < cpuid->nent; i++) {
1026                 vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function;
1027                 vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax;
1028                 vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx;
1029                 vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx;
1030                 vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx;
1031                 vcpu->arch.cpuid_entries[i].index = 0;
1032                 vcpu->arch.cpuid_entries[i].flags = 0;
1033                 vcpu->arch.cpuid_entries[i].padding[0] = 0;
1034                 vcpu->arch.cpuid_entries[i].padding[1] = 0;
1035                 vcpu->arch.cpuid_entries[i].padding[2] = 0;
1036         }
1037         vcpu->arch.cpuid_nent = cpuid->nent;
1038         cpuid_fix_nx_cap(vcpu);
1039         r = 0;
1040
1041 out_free:
1042         vfree(cpuid_entries);
1043 out:
1044         return r;
1045 }
1046
1047 static int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
1048                                     struct kvm_cpuid2 *cpuid,
1049                                     struct kvm_cpuid_entry2 __user *entries)
1050 {
1051         int r;
1052
1053         r = -E2BIG;
1054         if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
1055                 goto out;
1056         r = -EFAULT;
1057         if (copy_from_user(&vcpu->arch.cpuid_entries, entries,
1058                            cpuid->nent * sizeof(struct kvm_cpuid_entry2)))
1059                 goto out;
1060         vcpu->arch.cpuid_nent = cpuid->nent;
1061         return 0;
1062
1063 out:
1064         return r;
1065 }
1066
1067 static int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
1068                                     struct kvm_cpuid2 *cpuid,
1069                                     struct kvm_cpuid_entry2 __user *entries)
1070 {
1071         int r;
1072
1073         r = -E2BIG;
1074         if (cpuid->nent < vcpu->arch.cpuid_nent)
1075                 goto out;
1076         r = -EFAULT;
1077         if (copy_to_user(entries, &vcpu->arch.cpuid_entries,
1078                            vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2)))
1079                 goto out;
1080         return 0;
1081
1082 out:
1083         cpuid->nent = vcpu->arch.cpuid_nent;
1084         return r;
1085 }
1086
1087 static inline u32 bit(int bitno)
1088 {
1089         return 1 << (bitno & 31);
1090 }
1091
1092 static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function,
1093                           u32 index)
1094 {
1095         entry->function = function;
1096         entry->index = index;
1097         cpuid_count(entry->function, entry->index,
1098                 &entry->eax, &entry->ebx, &entry->ecx, &entry->edx);
1099         entry->flags = 0;
1100 }
1101
1102 static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
1103                          u32 index, int *nent, int maxnent)
1104 {
1105         const u32 kvm_supported_word0_x86_features = bit(X86_FEATURE_FPU) |
1106                 bit(X86_FEATURE_VME) | bit(X86_FEATURE_DE) |
1107                 bit(X86_FEATURE_PSE) | bit(X86_FEATURE_TSC) |
1108                 bit(X86_FEATURE_MSR) | bit(X86_FEATURE_PAE) |
1109                 bit(X86_FEATURE_CX8) | bit(X86_FEATURE_APIC) |
1110                 bit(X86_FEATURE_SEP) | bit(X86_FEATURE_PGE) |
1111                 bit(X86_FEATURE_CMOV) | bit(X86_FEATURE_PSE36) |
1112                 bit(X86_FEATURE_CLFLSH) | bit(X86_FEATURE_MMX) |
1113                 bit(X86_FEATURE_FXSR) | bit(X86_FEATURE_XMM) |
1114                 bit(X86_FEATURE_XMM2) | bit(X86_FEATURE_SELFSNOOP);
1115         const u32 kvm_supported_word1_x86_features = bit(X86_FEATURE_FPU) |
1116                 bit(X86_FEATURE_VME) | bit(X86_FEATURE_DE) |
1117                 bit(X86_FEATURE_PSE) | bit(X86_FEATURE_TSC) |
1118                 bit(X86_FEATURE_MSR) | bit(X86_FEATURE_PAE) |
1119                 bit(X86_FEATURE_CX8) | bit(X86_FEATURE_APIC) |
1120                 bit(X86_FEATURE_PGE) |
1121                 bit(X86_FEATURE_CMOV) | bit(X86_FEATURE_PSE36) |
1122                 bit(X86_FEATURE_MMX) | bit(X86_FEATURE_FXSR) |
1123                 bit(X86_FEATURE_SYSCALL) |
1124                 (bit(X86_FEATURE_NX) && is_efer_nx()) |
1125 #ifdef CONFIG_X86_64
1126                 bit(X86_FEATURE_LM) |
1127 #endif
1128                 bit(X86_FEATURE_MMXEXT) |
1129                 bit(X86_FEATURE_3DNOWEXT) |
1130                 bit(X86_FEATURE_3DNOW);
1131         const u32 kvm_supported_word3_x86_features =
1132                 bit(X86_FEATURE_XMM3) | bit(X86_FEATURE_CX16);
1133         const u32 kvm_supported_word6_x86_features =
1134                 bit(X86_FEATURE_LAHF_LM) | bit(X86_FEATURE_CMP_LEGACY);
1135
1136         /* all func 2 cpuid_count() should be called on the same cpu */
1137         get_cpu();
1138         do_cpuid_1_ent(entry, function, index);
1139         ++*nent;
1140
1141         switch (function) {
1142         case 0:
1143                 entry->eax = min(entry->eax, (u32)0xb);
1144                 break;
1145         case 1:
1146                 entry->edx &= kvm_supported_word0_x86_features;
1147                 entry->ecx &= kvm_supported_word3_x86_features;
1148                 break;
1149         /* function 2 entries are STATEFUL. That is, repeated cpuid commands
1150          * may return different values. This forces us to get_cpu() before
1151          * issuing the first command, and also to emulate this annoying behavior
1152          * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */
1153         case 2: {
1154                 int t, times = entry->eax & 0xff;
1155
1156                 entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
1157                 for (t = 1; t < times && *nent < maxnent; ++t) {
1158                         do_cpuid_1_ent(&entry[t], function, 0);
1159                         entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
1160                         ++*nent;
1161                 }
1162                 break;
1163         }
1164         /* function 4 and 0xb have additional index. */
1165         case 4: {
1166                 int i, cache_type;
1167
1168                 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1169                 /* read more entries until cache_type is zero */
1170                 for (i = 1; *nent < maxnent; ++i) {
1171                         cache_type = entry[i - 1].eax & 0x1f;
1172                         if (!cache_type)
1173                                 break;
1174                         do_cpuid_1_ent(&entry[i], function, i);
1175                         entry[i].flags |=
1176                                KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1177                         ++*nent;
1178                 }
1179                 break;
1180         }
1181         case 0xb: {
1182                 int i, level_type;
1183
1184                 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1185                 /* read more entries until level_type is zero */
1186                 for (i = 1; *nent < maxnent; ++i) {
1187                         level_type = entry[i - 1].ecx & 0xff;
1188                         if (!level_type)
1189                                 break;
1190                         do_cpuid_1_ent(&entry[i], function, i);
1191                         entry[i].flags |=
1192                                KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1193                         ++*nent;
1194                 }
1195                 break;
1196         }
1197         case 0x80000000:
1198                 entry->eax = min(entry->eax, 0x8000001a);
1199                 break;
1200         case 0x80000001:
1201                 entry->edx &= kvm_supported_word1_x86_features;
1202                 entry->ecx &= kvm_supported_word6_x86_features;
1203                 break;
1204         }
1205         put_cpu();
1206 }
1207
1208 static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
1209                                     struct kvm_cpuid_entry2 __user *entries)
1210 {
1211         struct kvm_cpuid_entry2 *cpuid_entries;
1212         int limit, nent = 0, r = -E2BIG;
1213         u32 func;
1214
1215         if (cpuid->nent < 1)
1216                 goto out;
1217         r = -ENOMEM;
1218         cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent);
1219         if (!cpuid_entries)
1220                 goto out;
1221
1222         do_cpuid_ent(&cpuid_entries[0], 0, 0, &nent, cpuid->nent);
1223         limit = cpuid_entries[0].eax;
1224         for (func = 1; func <= limit && nent < cpuid->nent; ++func)
1225                 do_cpuid_ent(&cpuid_entries[nent], func, 0,
1226                                 &nent, cpuid->nent);
1227         r = -E2BIG;
1228         if (nent >= cpuid->nent)
1229                 goto out_free;
1230
1231         do_cpuid_ent(&cpuid_entries[nent], 0x80000000, 0, &nent, cpuid->nent);
1232         limit = cpuid_entries[nent - 1].eax;
1233         for (func = 0x80000001; func <= limit && nent < cpuid->nent; ++func)
1234                 do_cpuid_ent(&cpuid_entries[nent], func, 0,
1235                                &nent, cpuid->nent);
1236         r = -EFAULT;
1237         if (copy_to_user(entries, cpuid_entries,
1238                         nent * sizeof(struct kvm_cpuid_entry2)))
1239                 goto out_free;
1240         cpuid->nent = nent;
1241         r = 0;
1242
1243 out_free:
1244         vfree(cpuid_entries);
1245 out:
1246         return r;
1247 }
1248
1249 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
1250                                     struct kvm_lapic_state *s)
1251 {
1252         vcpu_load(vcpu);
1253         memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s);
1254         vcpu_put(vcpu);
1255
1256         return 0;
1257 }
1258
1259 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
1260                                     struct kvm_lapic_state *s)
1261 {
1262         vcpu_load(vcpu);
1263         memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
1264         kvm_apic_post_state_restore(vcpu);
1265         vcpu_put(vcpu);
1266
1267         return 0;
1268 }
1269
1270 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
1271                                     struct kvm_interrupt *irq)
1272 {
1273         if (irq->irq < 0 || irq->irq >= 256)
1274                 return -EINVAL;
1275         if (irqchip_in_kernel(vcpu->kvm))
1276                 return -ENXIO;
1277         vcpu_load(vcpu);
1278
1279         set_bit(irq->irq, vcpu->arch.irq_pending);
1280         set_bit(irq->irq / BITS_PER_LONG, &vcpu->arch.irq_summary);
1281
1282         vcpu_put(vcpu);
1283
1284         return 0;
1285 }
1286
1287 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
1288                                            struct kvm_tpr_access_ctl *tac)
1289 {
1290         if (tac->flags)
1291                 return -EINVAL;
1292         vcpu->arch.tpr_access_reporting = !!tac->enabled;
1293         return 0;
1294 }
1295
1296 long kvm_arch_vcpu_ioctl(struct file *filp,
1297                          unsigned int ioctl, unsigned long arg)
1298 {
1299         struct kvm_vcpu *vcpu = filp->private_data;
1300         void __user *argp = (void __user *)arg;
1301         int r;
1302
1303         switch (ioctl) {
1304         case KVM_GET_LAPIC: {
1305                 struct kvm_lapic_state lapic;
1306
1307                 memset(&lapic, 0, sizeof lapic);
1308                 r = kvm_vcpu_ioctl_get_lapic(vcpu, &lapic);
1309                 if (r)
1310                         goto out;
1311                 r = -EFAULT;
1312                 if (copy_to_user(argp, &lapic, sizeof lapic))
1313                         goto out;
1314                 r = 0;
1315                 break;
1316         }
1317         case KVM_SET_LAPIC: {
1318                 struct kvm_lapic_state lapic;
1319
1320                 r = -EFAULT;
1321                 if (copy_from_user(&lapic, argp, sizeof lapic))
1322                         goto out;
1323                 r = kvm_vcpu_ioctl_set_lapic(vcpu, &lapic);;
1324                 if (r)
1325                         goto out;
1326                 r = 0;
1327                 break;
1328         }
1329         case KVM_INTERRUPT: {
1330                 struct kvm_interrupt irq;
1331
1332                 r = -EFAULT;
1333                 if (copy_from_user(&irq, argp, sizeof irq))
1334                         goto out;
1335                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
1336                 if (r)
1337                         goto out;
1338                 r = 0;
1339                 break;
1340         }
1341         case KVM_SET_CPUID: {
1342                 struct kvm_cpuid __user *cpuid_arg = argp;
1343                 struct kvm_cpuid cpuid;
1344
1345                 r = -EFAULT;
1346                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1347                         goto out;
1348                 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
1349                 if (r)
1350                         goto out;
1351                 break;
1352         }
1353         case KVM_SET_CPUID2: {
1354                 struct kvm_cpuid2 __user *cpuid_arg = argp;
1355                 struct kvm_cpuid2 cpuid;
1356
1357                 r = -EFAULT;
1358                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1359                         goto out;
1360                 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
1361                                 cpuid_arg->entries);
1362                 if (r)
1363                         goto out;
1364                 break;
1365         }
1366         case KVM_GET_CPUID2: {
1367                 struct kvm_cpuid2 __user *cpuid_arg = argp;
1368                 struct kvm_cpuid2 cpuid;
1369
1370                 r = -EFAULT;
1371                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1372                         goto out;
1373                 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
1374                                 cpuid_arg->entries);
1375                 if (r)
1376                         goto out;
1377                 r = -EFAULT;
1378                 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
1379                         goto out;
1380                 r = 0;
1381                 break;
1382         }
1383         case KVM_GET_MSRS:
1384                 r = msr_io(vcpu, argp, kvm_get_msr, 1);
1385                 break;
1386         case KVM_SET_MSRS:
1387                 r = msr_io(vcpu, argp, do_set_msr, 0);
1388                 break;
1389         case KVM_TPR_ACCESS_REPORTING: {
1390                 struct kvm_tpr_access_ctl tac;
1391
1392                 r = -EFAULT;
1393                 if (copy_from_user(&tac, argp, sizeof tac))
1394                         goto out;
1395                 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac);
1396                 if (r)
1397                         goto out;
1398                 r = -EFAULT;
1399                 if (copy_to_user(argp, &tac, sizeof tac))
1400                         goto out;
1401                 r = 0;
1402                 break;
1403         };
1404         case KVM_SET_VAPIC_ADDR: {
1405                 struct kvm_vapic_addr va;
1406
1407                 r = -EINVAL;
1408                 if (!irqchip_in_kernel(vcpu->kvm))
1409                         goto out;
1410                 r = -EFAULT;
1411                 if (copy_from_user(&va, argp, sizeof va))
1412                         goto out;
1413                 r = 0;
1414                 kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr);
1415                 break;
1416         }
1417         default:
1418                 r = -EINVAL;
1419         }
1420 out:
1421         return r;
1422 }
1423
1424 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
1425 {
1426         int ret;
1427
1428         if (addr > (unsigned int)(-3 * PAGE_SIZE))
1429                 return -1;
1430         ret = kvm_x86_ops->set_tss_addr(kvm, addr);
1431         return ret;
1432 }
1433
1434 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
1435                                           u32 kvm_nr_mmu_pages)
1436 {
1437         if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
1438                 return -EINVAL;
1439
1440         down_write(&kvm->slots_lock);
1441
1442         kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
1443         kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
1444
1445         up_write(&kvm->slots_lock);
1446         return 0;
1447 }
1448
1449 static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
1450 {
1451         return kvm->arch.n_alloc_mmu_pages;
1452 }
1453
1454 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
1455 {
1456         int i;
1457         struct kvm_mem_alias *alias;
1458
1459         for (i = 0; i < kvm->arch.naliases; ++i) {
1460                 alias = &kvm->arch.aliases[i];
1461                 if (gfn >= alias->base_gfn
1462                     && gfn < alias->base_gfn + alias->npages)
1463                         return alias->target_gfn + gfn - alias->base_gfn;
1464         }
1465         return gfn;
1466 }
1467
1468 /*
1469  * Set a new alias region.  Aliases map a portion of physical memory into
1470  * another portion.  This is useful for memory windows, for example the PC
1471  * VGA region.
1472  */
1473 static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
1474                                          struct kvm_memory_alias *alias)
1475 {
1476         int r, n;
1477         struct kvm_mem_alias *p;
1478
1479         r = -EINVAL;
1480         /* General sanity checks */
1481         if (alias->memory_size & (PAGE_SIZE - 1))
1482                 goto out;
1483         if (alias->guest_phys_addr & (PAGE_SIZE - 1))
1484                 goto out;
1485         if (alias->slot >= KVM_ALIAS_SLOTS)
1486                 goto out;
1487         if (alias->guest_phys_addr + alias->memory_size
1488             < alias->guest_phys_addr)
1489                 goto out;
1490         if (alias->target_phys_addr + alias->memory_size
1491             < alias->target_phys_addr)
1492                 goto out;
1493
1494         down_write(&kvm->slots_lock);
1495
1496         p = &kvm->arch.aliases[alias->slot];
1497         p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
1498         p->npages = alias->memory_size >> PAGE_SHIFT;
1499         p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
1500
1501         for (n = KVM_ALIAS_SLOTS; n > 0; --n)
1502                 if (kvm->arch.aliases[n - 1].npages)
1503                         break;
1504         kvm->arch.naliases = n;
1505
1506         kvm_mmu_zap_all(kvm);
1507
1508         up_write(&kvm->slots_lock);
1509
1510         return 0;
1511
1512 out:
1513         return r;
1514 }
1515
1516 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
1517 {
1518         int r;
1519
1520         r = 0;
1521         switch (chip->chip_id) {
1522         case KVM_IRQCHIP_PIC_MASTER:
1523                 memcpy(&chip->chip.pic,
1524                         &pic_irqchip(kvm)->pics[0],
1525                         sizeof(struct kvm_pic_state));
1526                 break;
1527         case KVM_IRQCHIP_PIC_SLAVE:
1528                 memcpy(&chip->chip.pic,
1529                         &pic_irqchip(kvm)->pics[1],
1530                         sizeof(struct kvm_pic_state));
1531                 break;
1532         case KVM_IRQCHIP_IOAPIC:
1533                 memcpy(&chip->chip.ioapic,
1534                         ioapic_irqchip(kvm),
1535                         sizeof(struct kvm_ioapic_state));
1536                 break;
1537         default:
1538                 r = -EINVAL;
1539                 break;
1540         }
1541         return r;
1542 }
1543
1544 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
1545 {
1546         int r;
1547
1548         r = 0;
1549         switch (chip->chip_id) {
1550         case KVM_IRQCHIP_PIC_MASTER:
1551                 memcpy(&pic_irqchip(kvm)->pics[0],
1552                         &chip->chip.pic,
1553                         sizeof(struct kvm_pic_state));
1554                 break;
1555         case KVM_IRQCHIP_PIC_SLAVE:
1556                 memcpy(&pic_irqchip(kvm)->pics[1],
1557                         &chip->chip.pic,
1558                         sizeof(struct kvm_pic_state));
1559                 break;
1560         case KVM_IRQCHIP_IOAPIC:
1561                 memcpy(ioapic_irqchip(kvm),
1562                         &chip->chip.ioapic,
1563                         sizeof(struct kvm_ioapic_state));
1564                 break;
1565         default:
1566                 r = -EINVAL;
1567                 break;
1568         }
1569         kvm_pic_update_irq(pic_irqchip(kvm));
1570         return r;
1571 }
1572
1573 static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps)
1574 {
1575         int r = 0;
1576
1577         memcpy(ps, &kvm->arch.vpit->pit_state, sizeof(struct kvm_pit_state));
1578         return r;
1579 }
1580
1581 static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
1582 {
1583         int r = 0;
1584
1585         memcpy(&kvm->arch.vpit->pit_state, ps, sizeof(struct kvm_pit_state));
1586         kvm_pit_load_count(kvm, 0, ps->channels[0].count);
1587         return r;
1588 }
1589
1590 /*
1591  * Get (and clear) the dirty memory log for a memory slot.
1592  */
1593 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
1594                                       struct kvm_dirty_log *log)
1595 {
1596         int r;
1597         int n;
1598         struct kvm_memory_slot *memslot;
1599         int is_dirty = 0;
1600
1601         down_write(&kvm->slots_lock);
1602
1603         r = kvm_get_dirty_log(kvm, log, &is_dirty);
1604         if (r)
1605                 goto out;
1606
1607         /* If nothing is dirty, don't bother messing with page tables. */
1608         if (is_dirty) {
1609                 kvm_mmu_slot_remove_write_access(kvm, log->slot);
1610                 kvm_flush_remote_tlbs(kvm);
1611                 memslot = &kvm->memslots[log->slot];
1612                 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
1613                 memset(memslot->dirty_bitmap, 0, n);
1614         }
1615         r = 0;
1616 out:
1617         up_write(&kvm->slots_lock);
1618         return r;
1619 }
1620
1621 long kvm_arch_vm_ioctl(struct file *filp,
1622                        unsigned int ioctl, unsigned long arg)
1623 {
1624         struct kvm *kvm = filp->private_data;
1625         void __user *argp = (void __user *)arg;
1626         int r = -EINVAL;
1627
1628         switch (ioctl) {
1629         case KVM_SET_TSS_ADDR:
1630                 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
1631                 if (r < 0)
1632                         goto out;
1633                 break;
1634         case KVM_SET_MEMORY_REGION: {
1635                 struct kvm_memory_region kvm_mem;
1636                 struct kvm_userspace_memory_region kvm_userspace_mem;
1637
1638                 r = -EFAULT;
1639                 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
1640                         goto out;
1641                 kvm_userspace_mem.slot = kvm_mem.slot;
1642                 kvm_userspace_mem.flags = kvm_mem.flags;
1643                 kvm_userspace_mem.guest_phys_addr = kvm_mem.guest_phys_addr;
1644                 kvm_userspace_mem.memory_size = kvm_mem.memory_size;
1645                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 0);
1646                 if (r)
1647                         goto out;
1648                 break;
1649         }
1650         case KVM_SET_NR_MMU_PAGES:
1651                 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
1652                 if (r)
1653                         goto out;
1654                 break;
1655         case KVM_GET_NR_MMU_PAGES:
1656                 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
1657                 break;
1658         case KVM_SET_MEMORY_ALIAS: {
1659                 struct kvm_memory_alias alias;
1660
1661                 r = -EFAULT;
1662                 if (copy_from_user(&alias, argp, sizeof alias))
1663                         goto out;
1664                 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
1665                 if (r)
1666                         goto out;
1667                 break;
1668         }
1669         case KVM_CREATE_IRQCHIP:
1670                 r = -ENOMEM;
1671                 kvm->arch.vpic = kvm_create_pic(kvm);
1672                 if (kvm->arch.vpic) {
1673                         r = kvm_ioapic_init(kvm);
1674                         if (r) {
1675                                 kfree(kvm->arch.vpic);
1676                                 kvm->arch.vpic = NULL;
1677                                 goto out;
1678                         }
1679                 } else
1680                         goto out;
1681                 break;
1682         case KVM_CREATE_PIT:
1683                 r = -ENOMEM;
1684                 kvm->arch.vpit = kvm_create_pit(kvm);
1685                 if (kvm->arch.vpit)
1686                         r = 0;
1687                 break;
1688         case KVM_IRQ_LINE: {
1689                 struct kvm_irq_level irq_event;
1690
1691                 r = -EFAULT;
1692                 if (copy_from_user(&irq_event, argp, sizeof irq_event))
1693                         goto out;
1694                 if (irqchip_in_kernel(kvm)) {
1695                         mutex_lock(&kvm->lock);
1696                         if (irq_event.irq < 16)
1697                                 kvm_pic_set_irq(pic_irqchip(kvm),
1698                                         irq_event.irq,
1699                                         irq_event.level);
1700                         kvm_ioapic_set_irq(kvm->arch.vioapic,
1701                                         irq_event.irq,
1702                                         irq_event.level);
1703                         mutex_unlock(&kvm->lock);
1704                         r = 0;
1705                 }
1706                 break;
1707         }
1708         case KVM_GET_IRQCHIP: {
1709                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
1710                 struct kvm_irqchip chip;
1711
1712                 r = -EFAULT;
1713                 if (copy_from_user(&chip, argp, sizeof chip))
1714                         goto out;
1715                 r = -ENXIO;
1716                 if (!irqchip_in_kernel(kvm))
1717                         goto out;
1718                 r = kvm_vm_ioctl_get_irqchip(kvm, &chip);
1719                 if (r)
1720                         goto out;
1721                 r = -EFAULT;
1722                 if (copy_to_user(argp, &chip, sizeof chip))
1723                         goto out;
1724                 r = 0;
1725                 break;
1726         }
1727         case KVM_SET_IRQCHIP: {
1728                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
1729                 struct kvm_irqchip chip;
1730
1731                 r = -EFAULT;
1732                 if (copy_from_user(&chip, argp, sizeof chip))
1733                         goto out;
1734                 r = -ENXIO;
1735                 if (!irqchip_in_kernel(kvm))
1736                         goto out;
1737                 r = kvm_vm_ioctl_set_irqchip(kvm, &chip);
1738                 if (r)
1739                         goto out;
1740                 r = 0;
1741                 break;
1742         }
1743         case KVM_GET_PIT: {
1744                 struct kvm_pit_state ps;
1745                 r = -EFAULT;
1746                 if (copy_from_user(&ps, argp, sizeof ps))
1747                         goto out;
1748                 r = -ENXIO;
1749                 if (!kvm->arch.vpit)
1750                         goto out;
1751                 r = kvm_vm_ioctl_get_pit(kvm, &ps);
1752                 if (r)
1753                         goto out;
1754                 r = -EFAULT;
1755                 if (copy_to_user(argp, &ps, sizeof ps))
1756                         goto out;
1757                 r = 0;
1758                 break;
1759         }
1760         case KVM_SET_PIT: {
1761                 struct kvm_pit_state ps;
1762                 r = -EFAULT;
1763                 if (copy_from_user(&ps, argp, sizeof ps))
1764                         goto out;
1765                 r = -ENXIO;
1766                 if (!kvm->arch.vpit)
1767                         goto out;
1768                 r = kvm_vm_ioctl_set_pit(kvm, &ps);
1769                 if (r)
1770                         goto out;
1771                 r = 0;
1772                 break;
1773         }
1774         default:
1775                 ;
1776         }
1777 out:
1778         return r;
1779 }
1780
1781 static void kvm_init_msr_list(void)
1782 {
1783         u32 dummy[2];
1784         unsigned i, j;
1785
1786         for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1787                 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1788                         continue;
1789                 if (j < i)
1790                         msrs_to_save[j] = msrs_to_save[i];
1791                 j++;
1792         }
1793         num_msrs_to_save = j;
1794 }
1795
1796 /*
1797  * Only apic need an MMIO device hook, so shortcut now..
1798  */
1799 static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
1800                                                 gpa_t addr)
1801 {
1802         struct kvm_io_device *dev;
1803
1804         if (vcpu->arch.apic) {
1805                 dev = &vcpu->arch.apic->dev;
1806                 if (dev->in_range(dev, addr))
1807                         return dev;
1808         }
1809         return NULL;
1810 }
1811
1812
1813 static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
1814                                                 gpa_t addr)
1815 {
1816         struct kvm_io_device *dev;
1817
1818         dev = vcpu_find_pervcpu_dev(vcpu, addr);
1819         if (dev == NULL)
1820                 dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
1821         return dev;
1822 }
1823
1824 int emulator_read_std(unsigned long addr,
1825                              void *val,
1826                              unsigned int bytes,
1827                              struct kvm_vcpu *vcpu)
1828 {
1829         void *data = val;
1830         int r = X86EMUL_CONTINUE;
1831
1832         while (bytes) {
1833                 gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
1834                 unsigned offset = addr & (PAGE_SIZE-1);
1835                 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
1836                 int ret;
1837
1838                 if (gpa == UNMAPPED_GVA) {
1839                         r = X86EMUL_PROPAGATE_FAULT;
1840                         goto out;
1841                 }
1842                 ret = kvm_read_guest(vcpu->kvm, gpa, data, tocopy);
1843                 if (ret < 0) {
1844                         r = X86EMUL_UNHANDLEABLE;
1845                         goto out;
1846                 }
1847
1848                 bytes -= tocopy;
1849                 data += tocopy;
1850                 addr += tocopy;
1851         }
1852 out:
1853         return r;
1854 }
1855 EXPORT_SYMBOL_GPL(emulator_read_std);
1856
1857 static int emulator_read_emulated(unsigned long addr,
1858                                   void *val,
1859                                   unsigned int bytes,
1860                                   struct kvm_vcpu *vcpu)
1861 {
1862         struct kvm_io_device *mmio_dev;
1863         gpa_t                 gpa;
1864
1865         if (vcpu->mmio_read_completed) {
1866                 memcpy(val, vcpu->mmio_data, bytes);
1867                 vcpu->mmio_read_completed = 0;
1868                 return X86EMUL_CONTINUE;
1869         }
1870
1871         gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
1872
1873         /* For APIC access vmexit */
1874         if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
1875                 goto mmio;
1876
1877         if (emulator_read_std(addr, val, bytes, vcpu)
1878                         == X86EMUL_CONTINUE)
1879                 return X86EMUL_CONTINUE;
1880         if (gpa == UNMAPPED_GVA)
1881                 return X86EMUL_PROPAGATE_FAULT;
1882
1883 mmio:
1884         /*
1885          * Is this MMIO handled locally?
1886          */
1887         mutex_lock(&vcpu->kvm->lock);
1888         mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1889         if (mmio_dev) {
1890                 kvm_iodevice_read(mmio_dev, gpa, bytes, val);
1891                 mutex_unlock(&vcpu->kvm->lock);
1892                 return X86EMUL_CONTINUE;
1893         }
1894         mutex_unlock(&vcpu->kvm->lock);
1895
1896         vcpu->mmio_needed = 1;
1897         vcpu->mmio_phys_addr = gpa;
1898         vcpu->mmio_size = bytes;
1899         vcpu->mmio_is_write = 0;
1900
1901         return X86EMUL_UNHANDLEABLE;
1902 }
1903
1904 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
1905                           const void *val, int bytes)
1906 {
1907         int ret;
1908
1909         ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
1910         if (ret < 0)
1911                 return 0;
1912         kvm_mmu_pte_write(vcpu, gpa, val, bytes);
1913         return 1;
1914 }
1915
1916 static int emulator_write_emulated_onepage(unsigned long addr,
1917                                            const void *val,
1918                                            unsigned int bytes,
1919                                            struct kvm_vcpu *vcpu)
1920 {
1921         struct kvm_io_device *mmio_dev;
1922         gpa_t                 gpa;
1923
1924         gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
1925
1926         if (gpa == UNMAPPED_GVA) {
1927                 kvm_inject_page_fault(vcpu, addr, 2);
1928                 return X86EMUL_PROPAGATE_FAULT;
1929         }
1930
1931         /* For APIC access vmexit */
1932         if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
1933                 goto mmio;
1934
1935         if (emulator_write_phys(vcpu, gpa, val, bytes))
1936                 return X86EMUL_CONTINUE;
1937
1938 mmio:
1939         /*
1940          * Is this MMIO handled locally?
1941          */
1942         mutex_lock(&vcpu->kvm->lock);
1943         mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1944         if (mmio_dev) {
1945                 kvm_iodevice_write(mmio_dev, gpa, bytes, val);
1946                 mutex_unlock(&vcpu->kvm->lock);
1947                 return X86EMUL_CONTINUE;
1948         }
1949         mutex_unlock(&vcpu->kvm->lock);
1950
1951         vcpu->mmio_needed = 1;
1952         vcpu->mmio_phys_addr = gpa;
1953         vcpu->mmio_size = bytes;
1954         vcpu->mmio_is_write = 1;
1955         memcpy(vcpu->mmio_data, val, bytes);
1956
1957         return X86EMUL_CONTINUE;
1958 }
1959
1960 int emulator_write_emulated(unsigned long addr,
1961                                    const void *val,
1962                                    unsigned int bytes,
1963                                    struct kvm_vcpu *vcpu)
1964 {
1965         /* Crossing a page boundary? */
1966         if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
1967                 int rc, now;
1968
1969                 now = -addr & ~PAGE_MASK;
1970                 rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
1971                 if (rc != X86EMUL_CONTINUE)
1972                         return rc;
1973                 addr += now;
1974                 val += now;
1975                 bytes -= now;
1976         }
1977         return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
1978 }
1979 EXPORT_SYMBOL_GPL(emulator_write_emulated);
1980
1981 static int emulator_cmpxchg_emulated(unsigned long addr,
1982                                      const void *old,
1983                                      const void *new,
1984                                      unsigned int bytes,
1985                                      struct kvm_vcpu *vcpu)
1986 {
1987         static int reported;
1988
1989         if (!reported) {
1990                 reported = 1;
1991                 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1992         }
1993 #ifndef CONFIG_X86_64
1994         /* guests cmpxchg8b have to be emulated atomically */
1995         if (bytes == 8) {
1996                 gpa_t gpa;
1997                 struct page *page;
1998                 char *kaddr;
1999                 u64 val;
2000
2001                 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
2002
2003                 if (gpa == UNMAPPED_GVA ||
2004                    (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
2005                         goto emul_write;
2006
2007                 if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK))
2008                         goto emul_write;
2009
2010                 val = *(u64 *)new;
2011
2012                 down_read(&current->mm->mmap_sem);
2013                 page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
2014                 up_read(&current->mm->mmap_sem);
2015
2016                 kaddr = kmap_atomic(page, KM_USER0);
2017                 set_64bit((u64 *)(kaddr + offset_in_page(gpa)), val);
2018                 kunmap_atomic(kaddr, KM_USER0);
2019                 kvm_release_page_dirty(page);
2020         }
2021 emul_write:
2022 #endif
2023
2024         return emulator_write_emulated(addr, new, bytes, vcpu);
2025 }
2026
2027 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
2028 {
2029         return kvm_x86_ops->get_segment_base(vcpu, seg);
2030 }
2031
2032 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
2033 {
2034         return X86EMUL_CONTINUE;
2035 }
2036
2037 int emulate_clts(struct kvm_vcpu *vcpu)
2038 {
2039         KVMTRACE_0D(CLTS, vcpu, handler);
2040         kvm_x86_ops->set_cr0(vcpu, vcpu->arch.cr0 & ~X86_CR0_TS);
2041         return X86EMUL_CONTINUE;
2042 }
2043
2044 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
2045 {
2046         struct kvm_vcpu *vcpu = ctxt->vcpu;
2047
2048         switch (dr) {
2049         case 0 ... 3:
2050                 *dest = kvm_x86_ops->get_dr(vcpu, dr);
2051                 return X86EMUL_CONTINUE;
2052         default:
2053                 pr_unimpl(vcpu, "%s: unexpected dr %u\n", __func__, dr);
2054                 return X86EMUL_UNHANDLEABLE;
2055         }
2056 }
2057
2058 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
2059 {
2060         unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
2061         int exception;
2062
2063         kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
2064         if (exception) {
2065                 /* FIXME: better handling */
2066                 return X86EMUL_UNHANDLEABLE;
2067         }
2068         return X86EMUL_CONTINUE;
2069 }
2070
2071 void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
2072 {
2073         static int reported;
2074         u8 opcodes[4];
2075         unsigned long rip = vcpu->arch.rip;
2076         unsigned long rip_linear;
2077
2078         rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS);
2079
2080         if (reported)
2081                 return;
2082
2083         emulator_read_std(rip_linear, (void *)opcodes, 4, vcpu);
2084
2085         printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n",
2086                context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
2087         reported = 1;
2088 }
2089 EXPORT_SYMBOL_GPL(kvm_report_emulation_failure);
2090
2091 static struct x86_emulate_ops emulate_ops = {
2092         .read_std            = emulator_read_std,
2093         .read_emulated       = emulator_read_emulated,
2094         .write_emulated      = emulator_write_emulated,
2095         .cmpxchg_emulated    = emulator_cmpxchg_emulated,
2096 };
2097
2098 int emulate_instruction(struct kvm_vcpu *vcpu,
2099                         struct kvm_run *run,
2100                         unsigned long cr2,
2101                         u16 error_code,
2102                         int emulation_type)
2103 {
2104         int r;
2105         struct decode_cache *c;
2106
2107         vcpu->arch.mmio_fault_cr2 = cr2;
2108         kvm_x86_ops->cache_regs(vcpu);
2109
2110         vcpu->mmio_is_write = 0;
2111         vcpu->arch.pio.string = 0;
2112
2113         if (!(emulation_type & EMULTYPE_NO_DECODE)) {
2114                 int cs_db, cs_l;
2115                 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
2116
2117                 vcpu->arch.emulate_ctxt.vcpu = vcpu;
2118                 vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
2119                 vcpu->arch.emulate_ctxt.mode =
2120                         (vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)
2121                         ? X86EMUL_MODE_REAL : cs_l
2122                         ? X86EMUL_MODE_PROT64 : cs_db
2123                         ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
2124
2125                 if (vcpu->arch.emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
2126                         vcpu->arch.emulate_ctxt.cs_base = 0;
2127                         vcpu->arch.emulate_ctxt.ds_base = 0;
2128                         vcpu->arch.emulate_ctxt.es_base = 0;
2129                         vcpu->arch.emulate_ctxt.ss_base = 0;
2130                 } else {
2131                         vcpu->arch.emulate_ctxt.cs_base =
2132                                         get_segment_base(vcpu, VCPU_SREG_CS);
2133                         vcpu->arch.emulate_ctxt.ds_base =
2134                                         get_segment_base(vcpu, VCPU_SREG_DS);
2135                         vcpu->arch.emulate_ctxt.es_base =
2136                                         get_segment_base(vcpu, VCPU_SREG_ES);
2137                         vcpu->arch.emulate_ctxt.ss_base =
2138                                         get_segment_base(vcpu, VCPU_SREG_SS);
2139                 }
2140
2141                 vcpu->arch.emulate_ctxt.gs_base =
2142                                         get_segment_base(vcpu, VCPU_SREG_GS);
2143                 vcpu->arch.emulate_ctxt.fs_base =
2144                                         get_segment_base(vcpu, VCPU_SREG_FS);
2145
2146                 r = x86_decode_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
2147
2148                 /* Reject the instructions other than VMCALL/VMMCALL when
2149                  * try to emulate invalid opcode */
2150                 c = &vcpu->arch.emulate_ctxt.decode;
2151                 if ((emulation_type & EMULTYPE_TRAP_UD) &&
2152                     (!(c->twobyte && c->b == 0x01 &&
2153                       (c->modrm_reg == 0 || c->modrm_reg == 3) &&
2154                        c->modrm_mod == 3 && c->modrm_rm == 1)))
2155                         return EMULATE_FAIL;
2156
2157                 ++vcpu->stat.insn_emulation;
2158                 if (r)  {
2159                         ++vcpu->stat.insn_emulation_fail;
2160                         if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
2161                                 return EMULATE_DONE;
2162                         return EMULATE_FAIL;
2163                 }
2164         }
2165
2166         r = x86_emulate_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
2167
2168         if (vcpu->arch.pio.string)
2169                 return EMULATE_DO_MMIO;
2170
2171         if ((r || vcpu->mmio_is_write) && run) {
2172                 run->exit_reason = KVM_EXIT_MMIO;
2173                 run->mmio.phys_addr = vcpu->mmio_phys_addr;
2174                 memcpy(run->mmio.data, vcpu->mmio_data, 8);
2175                 run->mmio.len = vcpu->mmio_size;
2176                 run->mmio.is_write = vcpu->mmio_is_write;
2177         }
2178
2179         if (r) {
2180                 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
2181                         return EMULATE_DONE;
2182                 if (!vcpu->mmio_needed) {
2183                         kvm_report_emulation_failure(vcpu, "mmio");
2184                         return EMULATE_FAIL;
2185                 }
2186                 return EMULATE_DO_MMIO;
2187         }
2188
2189         kvm_x86_ops->decache_regs(vcpu);
2190         kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
2191
2192         if (vcpu->mmio_is_write) {
2193                 vcpu->mmio_needed = 0;
2194                 return EMULATE_DO_MMIO;
2195         }
2196
2197         return EMULATE_DONE;
2198 }
2199 EXPORT_SYMBOL_GPL(emulate_instruction);
2200
2201 static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
2202 {
2203         int i;
2204
2205         for (i = 0; i < ARRAY_SIZE(vcpu->arch.pio.guest_pages); ++i)
2206                 if (vcpu->arch.pio.guest_pages[i]) {
2207                         kvm_release_page_dirty(vcpu->arch.pio.guest_pages[i]);
2208                         vcpu->arch.pio.guest_pages[i] = NULL;
2209                 }
2210 }
2211
2212 static int pio_copy_data(struct kvm_vcpu *vcpu)
2213 {
2214         void *p = vcpu->arch.pio_data;
2215         void *q;
2216         unsigned bytes;
2217         int nr_pages = vcpu->arch.pio.guest_pages[1] ? 2 : 1;
2218
2219         q = vmap(vcpu->arch.pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
2220                  PAGE_KERNEL);
2221         if (!q) {
2222                 free_pio_guest_pages(vcpu);
2223                 return -ENOMEM;
2224         }
2225         q += vcpu->arch.pio.guest_page_offset;
2226         bytes = vcpu->arch.pio.size * vcpu->arch.pio.cur_count;
2227         if (vcpu->arch.pio.in)
2228                 memcpy(q, p, bytes);
2229         else
2230                 memcpy(p, q, bytes);
2231         q -= vcpu->arch.pio.guest_page_offset;
2232         vunmap(q);
2233         free_pio_guest_pages(vcpu);
2234         return 0;
2235 }
2236
2237 int complete_pio(struct kvm_vcpu *vcpu)
2238 {
2239         struct kvm_pio_request *io = &vcpu->arch.pio;
2240         long delta;
2241         int r;
2242
2243         kvm_x86_ops->cache_regs(vcpu);
2244
2245         if (!io->string) {
2246                 if (io->in)
2247                         memcpy(&vcpu->arch.regs[VCPU_REGS_RAX], vcpu->arch.pio_data,
2248                                io->size);
2249         } else {
2250                 if (io->in) {
2251                         r = pio_copy_data(vcpu);
2252                         if (r) {
2253                                 kvm_x86_ops->cache_regs(vcpu);
2254                                 return r;
2255                         }
2256                 }
2257
2258                 delta = 1;
2259                 if (io->rep) {
2260                         delta *= io->cur_count;
2261                         /*
2262                          * The size of the register should really depend on
2263                          * current address size.
2264                          */
2265                         vcpu->arch.regs[VCPU_REGS_RCX] -= delta;
2266                 }
2267                 if (io->down)
2268                         delta = -delta;
2269                 delta *= io->size;
2270                 if (io->in)
2271                         vcpu->arch.regs[VCPU_REGS_RDI] += delta;
2272                 else
2273                         vcpu->arch.regs[VCPU_REGS_RSI] += delta;
2274         }
2275
2276         kvm_x86_ops->decache_regs(vcpu);
2277
2278         io->count -= io->cur_count;
2279         io->cur_count = 0;
2280
2281         return 0;
2282 }
2283
2284 static void kernel_pio(struct kvm_io_device *pio_dev,
2285                        struct kvm_vcpu *vcpu,
2286                        void *pd)
2287 {
2288         /* TODO: String I/O for in kernel device */
2289
2290         mutex_lock(&vcpu->kvm->lock);
2291         if (vcpu->arch.pio.in)
2292                 kvm_iodevice_read(pio_dev, vcpu->arch.pio.port,
2293                                   vcpu->arch.pio.size,
2294                                   pd);
2295         else
2296                 kvm_iodevice_write(pio_dev, vcpu->arch.pio.port,
2297                                    vcpu->arch.pio.size,
2298                                    pd);
2299         mutex_unlock(&vcpu->kvm->lock);
2300 }
2301
2302 static void pio_string_write(struct kvm_io_device *pio_dev,
2303                              struct kvm_vcpu *vcpu)
2304 {
2305         struct kvm_pio_request *io = &vcpu->arch.pio;
2306         void *pd = vcpu->arch.pio_data;
2307         int i;
2308
2309         mutex_lock(&vcpu->kvm->lock);
2310         for (i = 0; i < io->cur_count; i++) {
2311                 kvm_iodevice_write(pio_dev, io->port,
2312                                    io->size,
2313                                    pd);
2314                 pd += io->size;
2315         }
2316         mutex_unlock(&vcpu->kvm->lock);
2317 }
2318
2319 static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
2320                                                gpa_t addr)
2321 {
2322         return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
2323 }
2324
2325 int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
2326                   int size, unsigned port)
2327 {
2328         struct kvm_io_device *pio_dev;
2329
2330         vcpu->run->exit_reason = KVM_EXIT_IO;
2331         vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
2332         vcpu->run->io.size = vcpu->arch.pio.size = size;
2333         vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
2334         vcpu->run->io.count = vcpu->arch.pio.count = vcpu->arch.pio.cur_count = 1;
2335         vcpu->run->io.port = vcpu->arch.pio.port = port;
2336         vcpu->arch.pio.in = in;
2337         vcpu->arch.pio.string = 0;
2338         vcpu->arch.pio.down = 0;
2339         vcpu->arch.pio.guest_page_offset = 0;
2340         vcpu->arch.pio.rep = 0;
2341
2342         if (vcpu->run->io.direction == KVM_EXIT_IO_IN)
2343                 KVMTRACE_2D(IO_READ, vcpu, vcpu->run->io.port, (u32)size,
2344                             handler);
2345         else
2346                 KVMTRACE_2D(IO_WRITE, vcpu, vcpu->run->io.port, (u32)size,
2347                             handler);
2348
2349         kvm_x86_ops->cache_regs(vcpu);
2350         memcpy(vcpu->arch.pio_data, &vcpu->arch.regs[VCPU_REGS_RAX], 4);
2351
2352         kvm_x86_ops->skip_emulated_instruction(vcpu);
2353
2354         pio_dev = vcpu_find_pio_dev(vcpu, port);
2355         if (pio_dev) {
2356                 kernel_pio(pio_dev, vcpu, vcpu->arch.pio_data);
2357                 complete_pio(vcpu);
2358                 return 1;
2359         }
2360         return 0;
2361 }
2362 EXPORT_SYMBOL_GPL(kvm_emulate_pio);
2363
2364 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
2365                   int size, unsigned long count, int down,
2366                   gva_t address, int rep, unsigned port)
2367 {
2368         unsigned now, in_page;
2369         int i, ret = 0;
2370         int nr_pages = 1;
2371         struct page *page;
2372         struct kvm_io_device *pio_dev;
2373
2374         vcpu->run->exit_reason = KVM_EXIT_IO;
2375         vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
2376         vcpu->run->io.size = vcpu->arch.pio.size = size;
2377         vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
2378         vcpu->run->io.count = vcpu->arch.pio.count = vcpu->arch.pio.cur_count = count;
2379         vcpu->run->io.port = vcpu->arch.pio.port = port;
2380         vcpu->arch.pio.in = in;
2381         vcpu->arch.pio.string = 1;
2382         vcpu->arch.pio.down = down;
2383         vcpu->arch.pio.guest_page_offset = offset_in_page(address);
2384         vcpu->arch.pio.rep = rep;
2385
2386         if (vcpu->run->io.direction == KVM_EXIT_IO_IN)
2387                 KVMTRACE_2D(IO_READ, vcpu, vcpu->run->io.port, (u32)size,
2388                             handler);
2389         else
2390                 KVMTRACE_2D(IO_WRITE, vcpu, vcpu->run->io.port, (u32)size,
2391                             handler);
2392
2393         if (!count) {
2394                 kvm_x86_ops->skip_emulated_instruction(vcpu);
2395                 return 1;
2396         }
2397
2398         if (!down)
2399                 in_page = PAGE_SIZE - offset_in_page(address);
2400         else
2401                 in_page = offset_in_page(address) + size;
2402         now = min(count, (unsigned long)in_page / size);
2403         if (!now) {
2404                 /*
2405                  * String I/O straddles page boundary.  Pin two guest pages
2406                  * so that we satisfy atomicity constraints.  Do just one
2407                  * transaction to avoid complexity.
2408                  */
2409                 nr_pages = 2;
2410                 now = 1;
2411         }
2412         if (down) {
2413                 /*
2414                  * String I/O in reverse.  Yuck.  Kill the guest, fix later.
2415                  */
2416                 pr_unimpl(vcpu, "guest string pio down\n");
2417                 kvm_inject_gp(vcpu, 0);
2418                 return 1;
2419         }
2420         vcpu->run->io.count = now;
2421         vcpu->arch.pio.cur_count = now;
2422
2423         if (vcpu->arch.pio.cur_count == vcpu->arch.pio.count)
2424                 kvm_x86_ops->skip_emulated_instruction(vcpu);
2425
2426         for (i = 0; i < nr_pages; ++i) {
2427                 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
2428                 vcpu->arch.pio.guest_pages[i] = page;
2429                 if (!page) {
2430                         kvm_inject_gp(vcpu, 0);
2431                         free_pio_guest_pages(vcpu);
2432                         return 1;
2433                 }
2434         }
2435
2436         pio_dev = vcpu_find_pio_dev(vcpu, port);
2437         if (!vcpu->arch.pio.in) {
2438                 /* string PIO write */
2439                 ret = pio_copy_data(vcpu);
2440                 if (ret >= 0 && pio_dev) {
2441                         pio_string_write(pio_dev, vcpu);
2442                         complete_pio(vcpu);
2443                         if (vcpu->arch.pio.count == 0)
2444                                 ret = 1;
2445                 }
2446         } else if (pio_dev)
2447                 pr_unimpl(vcpu, "no string pio read support yet, "
2448                        "port %x size %d count %ld\n",
2449                         port, size, count);
2450
2451         return ret;
2452 }
2453 EXPORT_SYMBOL_GPL(kvm_emulate_pio_string);
2454
2455 int kvm_arch_init(void *opaque)
2456 {
2457         int r;
2458         struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque;
2459
2460         if (kvm_x86_ops) {
2461                 printk(KERN_ERR "kvm: already loaded the other module\n");
2462                 r = -EEXIST;
2463                 goto out;
2464         }
2465
2466         if (!ops->cpu_has_kvm_support()) {
2467                 printk(KERN_ERR "kvm: no hardware support\n");
2468                 r = -EOPNOTSUPP;
2469                 goto out;
2470         }
2471         if (ops->disabled_by_bios()) {
2472                 printk(KERN_ERR "kvm: disabled by bios\n");
2473                 r = -EOPNOTSUPP;
2474                 goto out;
2475         }
2476
2477         r = kvm_mmu_module_init();
2478         if (r)
2479                 goto out;
2480
2481         kvm_init_msr_list();
2482
2483         kvm_x86_ops = ops;
2484         kvm_mmu_set_nonpresent_ptes(0ull, 0ull);
2485         kvm_mmu_set_base_ptes(PT_PRESENT_MASK);
2486         kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK,
2487                         PT_DIRTY_MASK, PT64_NX_MASK, 0);
2488         return 0;
2489
2490 out:
2491         return r;
2492 }
2493
2494 void kvm_arch_exit(void)
2495 {
2496         kvm_x86_ops = NULL;
2497         kvm_mmu_module_exit();
2498 }
2499
2500 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
2501 {
2502         ++vcpu->stat.halt_exits;
2503         KVMTRACE_0D(HLT, vcpu, handler);
2504         if (irqchip_in_kernel(vcpu->kvm)) {
2505                 vcpu->arch.mp_state = KVM_MP_STATE_HALTED;
2506                 up_read(&vcpu->kvm->slots_lock);
2507                 kvm_vcpu_block(vcpu);
2508                 down_read(&vcpu->kvm->slots_lock);
2509                 if (vcpu->arch.mp_state != KVM_MP_STATE_RUNNABLE)
2510                         return -EINTR;
2511                 return 1;
2512         } else {
2513                 vcpu->run->exit_reason = KVM_EXIT_HLT;
2514                 return 0;
2515         }
2516 }
2517 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
2518
2519 static inline gpa_t hc_gpa(struct kvm_vcpu *vcpu, unsigned long a0,
2520                            unsigned long a1)
2521 {
2522         if (is_long_mode(vcpu))
2523                 return a0;
2524         else
2525                 return a0 | ((gpa_t)a1 << 32);
2526 }
2527
2528 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
2529 {
2530         unsigned long nr, a0, a1, a2, a3, ret;
2531         int r = 1;
2532
2533         kvm_x86_ops->cache_regs(vcpu);
2534
2535         nr = vcpu->arch.regs[VCPU_REGS_RAX];
2536         a0 = vcpu->arch.regs[VCPU_REGS_RBX];
2537         a1 = vcpu->arch.regs[VCPU_REGS_RCX];
2538         a2 = vcpu->arch.regs[VCPU_REGS_RDX];
2539         a3 = vcpu->arch.regs[VCPU_REGS_RSI];
2540
2541         KVMTRACE_1D(VMMCALL, vcpu, (u32)nr, handler);
2542
2543         if (!is_long_mode(vcpu)) {
2544                 nr &= 0xFFFFFFFF;
2545                 a0 &= 0xFFFFFFFF;
2546                 a1 &= 0xFFFFFFFF;
2547                 a2 &= 0xFFFFFFFF;
2548                 a3 &= 0xFFFFFFFF;
2549         }
2550
2551         switch (nr) {
2552         case KVM_HC_VAPIC_POLL_IRQ:
2553                 ret = 0;
2554                 break;
2555         case KVM_HC_MMU_OP:
2556                 r = kvm_pv_mmu_op(vcpu, a0, hc_gpa(vcpu, a1, a2), &ret);
2557                 break;
2558         default:
2559                 ret = -KVM_ENOSYS;
2560                 break;
2561         }
2562         vcpu->arch.regs[VCPU_REGS_RAX] = ret;
2563         kvm_x86_ops->decache_regs(vcpu);
2564         ++vcpu->stat.hypercalls;
2565         return r;
2566 }
2567 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
2568
2569 int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
2570 {
2571         char instruction[3];
2572         int ret = 0;
2573
2574
2575         /*
2576          * Blow out the MMU to ensure that no other VCPU has an active mapping
2577          * to ensure that the updated hypercall appears atomically across all
2578          * VCPUs.
2579          */
2580         kvm_mmu_zap_all(vcpu->kvm);
2581
2582         kvm_x86_ops->cache_regs(vcpu);
2583         kvm_x86_ops->patch_hypercall(vcpu, instruction);
2584         if (emulator_write_emulated(vcpu->arch.rip, instruction, 3, vcpu)
2585             != X86EMUL_CONTINUE)
2586                 ret = -EFAULT;
2587
2588         return ret;
2589 }
2590
2591 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
2592 {
2593         return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
2594 }
2595
2596 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
2597 {
2598         struct descriptor_table dt = { limit, base };
2599
2600         kvm_x86_ops->set_gdt(vcpu, &dt);
2601 }
2602
2603 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
2604 {
2605         struct descriptor_table dt = { limit, base };
2606
2607         kvm_x86_ops->set_idt(vcpu, &dt);
2608 }
2609
2610 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
2611                    unsigned long *rflags)
2612 {
2613         kvm_lmsw(vcpu, msw);
2614         *rflags = kvm_x86_ops->get_rflags(vcpu);
2615 }
2616
2617 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
2618 {
2619         unsigned long value;
2620
2621         kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2622         switch (cr) {
2623         case 0:
2624                 value = vcpu->arch.cr0;
2625                 break;
2626         case 2:
2627                 value = vcpu->arch.cr2;
2628                 break;
2629         case 3:
2630                 value = vcpu->arch.cr3;
2631                 break;
2632         case 4:
2633                 value = vcpu->arch.cr4;
2634                 break;
2635         case 8:
2636                 value = kvm_get_cr8(vcpu);
2637                 break;
2638         default:
2639                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
2640                 return 0;
2641         }
2642         KVMTRACE_3D(CR_READ, vcpu, (u32)cr, (u32)value,
2643                     (u32)((u64)value >> 32), handler);
2644
2645         return value;
2646 }
2647
2648 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
2649                      unsigned long *rflags)
2650 {
2651         KVMTRACE_3D(CR_WRITE, vcpu, (u32)cr, (u32)val,
2652                     (u32)((u64)val >> 32), handler);
2653
2654         switch (cr) {
2655         case 0:
2656                 kvm_set_cr0(vcpu, mk_cr_64(vcpu->arch.cr0, val));
2657                 *rflags = kvm_x86_ops->get_rflags(vcpu);
2658                 break;
2659         case 2:
2660                 vcpu->arch.cr2 = val;
2661                 break;
2662         case 3:
2663                 kvm_set_cr3(vcpu, val);
2664                 break;
2665         case 4:
2666                 kvm_set_cr4(vcpu, mk_cr_64(vcpu->arch.cr4, val));
2667                 break;
2668         case 8:
2669                 kvm_set_cr8(vcpu, val & 0xfUL);
2670                 break;
2671         default:
2672                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
2673         }
2674 }
2675
2676 static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i)
2677 {
2678         struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i];
2679         int j, nent = vcpu->arch.cpuid_nent;
2680
2681         e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT;
2682         /* when no next entry is found, the current entry[i] is reselected */
2683         for (j = i + 1; j == i; j = (j + 1) % nent) {
2684                 struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j];
2685                 if (ej->function == e->function) {
2686                         ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
2687                         return j;
2688                 }
2689         }
2690         return 0; /* silence gcc, even though control never reaches here */
2691 }
2692
2693 /* find an entry with matching function, matching index (if needed), and that
2694  * should be read next (if it's stateful) */
2695 static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e,
2696         u32 function, u32 index)
2697 {
2698         if (e->function != function)
2699                 return 0;
2700         if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index)
2701                 return 0;
2702         if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) &&
2703                 !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT))
2704                 return 0;
2705         return 1;
2706 }
2707
2708 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
2709 {
2710         int i;
2711         u32 function, index;
2712         struct kvm_cpuid_entry2 *e, *best;
2713
2714         kvm_x86_ops->cache_regs(vcpu);
2715         function = vcpu->arch.regs[VCPU_REGS_RAX];
2716         index = vcpu->arch.regs[VCPU_REGS_RCX];
2717         vcpu->arch.regs[VCPU_REGS_RAX] = 0;
2718         vcpu->arch.regs[VCPU_REGS_RBX] = 0;
2719         vcpu->arch.regs[VCPU_REGS_RCX] = 0;
2720         vcpu->arch.regs[VCPU_REGS_RDX] = 0;
2721         best = NULL;
2722         for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
2723                 e = &vcpu->arch.cpuid_entries[i];
2724                 if (is_matching_cpuid_entry(e, function, index)) {
2725                         if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC)
2726                                 move_to_next_stateful_cpuid_entry(vcpu, i);
2727                         best = e;
2728                         break;
2729                 }
2730                 /*
2731                  * Both basic or both extended?
2732                  */
2733                 if (((e->function ^ function) & 0x80000000) == 0)
2734                         if (!best || e->function > best->function)
2735                                 best = e;
2736         }
2737         if (best) {
2738                 vcpu->arch.regs[VCPU_REGS_RAX] = best->eax;
2739                 vcpu->arch.regs[VCPU_REGS_RBX] = best->ebx;
2740                 vcpu->arch.regs[VCPU_REGS_RCX] = best->ecx;
2741                 vcpu->arch.regs[VCPU_REGS_RDX] = best->edx;
2742         }
2743         kvm_x86_ops->decache_regs(vcpu);
2744         kvm_x86_ops->skip_emulated_instruction(vcpu);
2745         KVMTRACE_5D(CPUID, vcpu, function,
2746                     (u32)vcpu->arch.regs[VCPU_REGS_RAX],
2747                     (u32)vcpu->arch.regs[VCPU_REGS_RBX],
2748                     (u32)vcpu->arch.regs[VCPU_REGS_RCX],
2749                     (u32)vcpu->arch.regs[VCPU_REGS_RDX], handler);
2750 }
2751 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
2752
2753 /*
2754  * Check if userspace requested an interrupt window, and that the
2755  * interrupt window is open.
2756  *
2757  * No need to exit to userspace if we already have an interrupt queued.
2758  */
2759 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu,
2760                                           struct kvm_run *kvm_run)
2761 {
2762         return (!vcpu->arch.irq_summary &&
2763                 kvm_run->request_interrupt_window &&
2764                 vcpu->arch.interrupt_window_open &&
2765                 (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF));
2766 }
2767
2768 static void post_kvm_run_save(struct kvm_vcpu *vcpu,
2769                               struct kvm_run *kvm_run)
2770 {
2771         kvm_run->if_flag = (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
2772         kvm_run->cr8 = kvm_get_cr8(vcpu);
2773         kvm_run->apic_base = kvm_get_apic_base(vcpu);
2774         if (irqchip_in_kernel(vcpu->kvm))
2775                 kvm_run->ready_for_interrupt_injection = 1;
2776         else
2777                 kvm_run->ready_for_interrupt_injection =
2778                                         (vcpu->arch.interrupt_window_open &&
2779                                          vcpu->arch.irq_summary == 0);
2780 }
2781
2782 static void vapic_enter(struct kvm_vcpu *vcpu)
2783 {
2784         struct kvm_lapic *apic = vcpu->arch.apic;
2785         struct page *page;
2786
2787         if (!apic || !apic->vapic_addr)
2788                 return;
2789
2790         down_read(&current->mm->mmap_sem);
2791         page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
2792         up_read(&current->mm->mmap_sem);
2793
2794         vcpu->arch.apic->vapic_page = page;
2795 }
2796
2797 static void vapic_exit(struct kvm_vcpu *vcpu)
2798 {
2799         struct kvm_lapic *apic = vcpu->arch.apic;
2800
2801         if (!apic || !apic->vapic_addr)
2802                 return;
2803
2804         kvm_release_page_dirty(apic->vapic_page);
2805         mark_page_dirty(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
2806 }
2807
2808 static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2809 {
2810         int r;
2811
2812         if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED)) {
2813                 pr_debug("vcpu %d received sipi with vector # %x\n",
2814                        vcpu->vcpu_id, vcpu->arch.sipi_vector);
2815                 kvm_lapic_reset(vcpu);
2816                 r = kvm_x86_ops->vcpu_reset(vcpu);
2817                 if (r)
2818                         return r;
2819                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
2820         }
2821
2822         down_read(&vcpu->kvm->slots_lock);
2823         vapic_enter(vcpu);
2824
2825 preempted:
2826         if (vcpu->guest_debug.enabled)
2827                 kvm_x86_ops->guest_debug_pre(vcpu);
2828
2829 again:
2830         if (vcpu->requests)
2831                 if (test_and_clear_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests))
2832                         kvm_mmu_unload(vcpu);
2833
2834         r = kvm_mmu_reload(vcpu);
2835         if (unlikely(r))
2836                 goto out;
2837
2838         if (vcpu->requests) {
2839                 if (test_and_clear_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests))
2840                         __kvm_migrate_timers(vcpu);
2841                 if (test_and_clear_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
2842                         kvm_x86_ops->tlb_flush(vcpu);
2843                 if (test_and_clear_bit(KVM_REQ_REPORT_TPR_ACCESS,
2844                                        &vcpu->requests)) {
2845                         kvm_run->exit_reason = KVM_EXIT_TPR_ACCESS;
2846                         r = 0;
2847                         goto out;
2848                 }
2849                 if (test_and_clear_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests)) {
2850                         kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
2851                         r = 0;
2852                         goto out;
2853                 }
2854         }
2855
2856         clear_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests);
2857         kvm_inject_pending_timer_irqs(vcpu);
2858
2859         preempt_disable();
2860
2861         kvm_x86_ops->prepare_guest_switch(vcpu);
2862         kvm_load_guest_fpu(vcpu);
2863
2864         local_irq_disable();
2865
2866         if (vcpu->requests || need_resched()) {
2867                 local_irq_enable();
2868                 preempt_enable();
2869                 r = 1;
2870                 goto out;
2871         }
2872
2873         if (signal_pending(current)) {
2874                 local_irq_enable();
2875                 preempt_enable();
2876                 r = -EINTR;
2877                 kvm_run->exit_reason = KVM_EXIT_INTR;
2878                 ++vcpu->stat.signal_exits;
2879                 goto out;
2880         }
2881
2882         vcpu->guest_mode = 1;
2883         /*
2884          * Make sure that guest_mode assignment won't happen after
2885          * testing the pending IRQ vector bitmap.
2886          */
2887         smp_wmb();
2888
2889         if (vcpu->arch.exception.pending)
2890                 __queue_exception(vcpu);
2891         else if (irqchip_in_kernel(vcpu->kvm))
2892                 kvm_x86_ops->inject_pending_irq(vcpu);
2893         else
2894                 kvm_x86_ops->inject_pending_vectors(vcpu, kvm_run);
2895
2896         kvm_lapic_sync_to_vapic(vcpu);
2897
2898         up_read(&vcpu->kvm->slots_lock);
2899
2900         kvm_guest_enter();
2901
2902
2903         KVMTRACE_0D(VMENTRY, vcpu, entryexit);
2904         kvm_x86_ops->run(vcpu, kvm_run);
2905
2906         vcpu->guest_mode = 0;
2907         local_irq_enable();
2908
2909         ++vcpu->stat.exits;
2910
2911         /*
2912          * We must have an instruction between local_irq_enable() and
2913          * kvm_guest_exit(), so the timer interrupt isn't delayed by
2914          * the interrupt shadow.  The stat.exits increment will do nicely.
2915          * But we need to prevent reordering, hence this barrier():
2916          */
2917         barrier();
2918
2919         kvm_guest_exit();
2920
2921         preempt_enable();
2922
2923         down_read(&vcpu->kvm->slots_lock);
2924
2925         /*
2926          * Profile KVM exit RIPs:
2927          */
2928         if (unlikely(prof_on == KVM_PROFILING)) {
2929                 kvm_x86_ops->cache_regs(vcpu);
2930                 profile_hit(KVM_PROFILING, (void *)vcpu->arch.rip);
2931         }
2932
2933         if (vcpu->arch.exception.pending && kvm_x86_ops->exception_injected(vcpu))
2934                 vcpu->arch.exception.pending = false;
2935
2936         kvm_lapic_sync_from_vapic(vcpu);
2937
2938         r = kvm_x86_ops->handle_exit(kvm_run, vcpu);
2939
2940         if (r > 0) {
2941                 if (dm_request_for_irq_injection(vcpu, kvm_run)) {
2942                         r = -EINTR;
2943                         kvm_run->exit_reason = KVM_EXIT_INTR;
2944                         ++vcpu->stat.request_irq_exits;
2945                         goto out;
2946                 }
2947                 if (!need_resched())
2948                         goto again;
2949         }
2950
2951 out:
2952         up_read(&vcpu->kvm->slots_lock);
2953         if (r > 0) {
2954                 kvm_resched(vcpu);
2955                 down_read(&vcpu->kvm->slots_lock);
2956                 goto preempted;
2957         }
2958
2959         post_kvm_run_save(vcpu, kvm_run);
2960
2961         down_read(&vcpu->kvm->slots_lock);
2962         vapic_exit(vcpu);
2963         up_read(&vcpu->kvm->slots_lock);
2964
2965         return r;
2966 }
2967
2968 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2969 {
2970         int r;
2971         sigset_t sigsaved;
2972
2973         vcpu_load(vcpu);
2974
2975         if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
2976                 kvm_vcpu_block(vcpu);
2977                 vcpu_put(vcpu);
2978                 return -EAGAIN;
2979         }
2980
2981         if (vcpu->sigset_active)
2982                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
2983
2984         /* re-sync apic's tpr */
2985         if (!irqchip_in_kernel(vcpu->kvm))
2986                 kvm_set_cr8(vcpu, kvm_run->cr8);
2987
2988         if (vcpu->arch.pio.cur_count) {
2989                 r = complete_pio(vcpu);
2990                 if (r)
2991                         goto out;
2992         }
2993 #if CONFIG_HAS_IOMEM
2994         if (vcpu->mmio_needed) {
2995                 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
2996                 vcpu->mmio_read_completed = 1;
2997                 vcpu->mmio_needed = 0;
2998
2999                 down_read(&vcpu->kvm->slots_lock);
3000                 r = emulate_instruction(vcpu, kvm_run,
3001                                         vcpu->arch.mmio_fault_cr2, 0,
3002                                         EMULTYPE_NO_DECODE);
3003                 up_read(&vcpu->kvm->slots_lock);
3004                 if (r == EMULATE_DO_MMIO) {
3005                         /*
3006                          * Read-modify-write.  Back to userspace.
3007                          */
3008                         r = 0;
3009                         goto out;
3010                 }
3011         }
3012 #endif
3013         if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
3014                 kvm_x86_ops->cache_regs(vcpu);
3015                 vcpu->arch.regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
3016                 kvm_x86_ops->decache_regs(vcpu);
3017         }
3018
3019         r = __vcpu_run(vcpu, kvm_run);
3020
3021 out:
3022         if (vcpu->sigset_active)
3023                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
3024
3025         vcpu_put(vcpu);
3026         return r;
3027 }
3028
3029 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
3030 {
3031         vcpu_load(vcpu);
3032
3033         kvm_x86_ops->cache_regs(vcpu);
3034
3035         regs->rax = vcpu->arch.regs[VCPU_REGS_RAX];
3036         regs->rbx = vcpu->arch.regs[VCPU_REGS_RBX];
3037         regs->rcx = vcpu->arch.regs[VCPU_REGS_RCX];
3038         regs->rdx = vcpu->arch.regs[VCPU_REGS_RDX];
3039         regs->rsi = vcpu->arch.regs[VCPU_REGS_RSI];
3040         regs->rdi = vcpu->arch.regs[VCPU_REGS_RDI];
3041         regs->rsp = vcpu->arch.regs[VCPU_REGS_RSP];
3042         regs->rbp = vcpu->arch.regs[VCPU_REGS_RBP];
3043 #ifdef CONFIG_X86_64
3044         regs->r8 = vcpu->arch.regs[VCPU_REGS_R8];
3045         regs->r9 = vcpu->arch.regs[VCPU_REGS_R9];
3046         regs->r10 = vcpu->arch.regs[VCPU_REGS_R10];
3047         regs->r11 = vcpu->arch.regs[VCPU_REGS_R11];
3048         regs->r12 = vcpu->arch.regs[VCPU_REGS_R12];
3049         regs->r13 = vcpu->arch.regs[VCPU_REGS_R13];
3050         regs->r14 = vcpu->arch.regs[VCPU_REGS_R14];
3051         regs->r15 = vcpu->arch.regs[VCPU_REGS_R15];
3052 #endif
3053
3054         regs->rip = vcpu->arch.rip;
3055         regs->rflags = kvm_x86_ops->get_rflags(vcpu);
3056
3057         /*
3058          * Don't leak debug flags in case they were set for guest debugging
3059          */
3060         if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
3061                 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
3062
3063         vcpu_put(vcpu);
3064
3065         return 0;
3066 }
3067
3068 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
3069 {
3070         vcpu_load(vcpu);
3071
3072         vcpu->arch.regs[VCPU_REGS_RAX] = regs->rax;
3073         vcpu->arch.regs[VCPU_REGS_RBX] = regs->rbx;
3074         vcpu->arch.regs[VCPU_REGS_RCX] = regs->rcx;
3075         vcpu->arch.regs[VCPU_REGS_RDX] = regs->rdx;
3076         vcpu->arch.regs[VCPU_REGS_RSI] = regs->rsi;
3077         vcpu->arch.regs[VCPU_REGS_RDI] = regs->rdi;
3078         vcpu->arch.regs[VCPU_REGS_RSP] = regs->rsp;
3079         vcpu->arch.regs[VCPU_REGS_RBP] = regs->rbp;
3080 #ifdef CONFIG_X86_64
3081         vcpu->arch.regs[VCPU_REGS_R8] = regs->r8;
3082         vcpu->arch.regs[VCPU_REGS_R9] = regs->r9;
3083         vcpu->arch.regs[VCPU_REGS_R10] = regs->r10;
3084         vcpu->arch.regs[VCPU_REGS_R11] = regs->r11;
3085         vcpu->arch.regs[VCPU_REGS_R12] = regs->r12;
3086         vcpu->arch.regs[VCPU_REGS_R13] = regs->r13;
3087         vcpu->arch.regs[VCPU_REGS_R14] = regs->r14;
3088         vcpu->arch.regs[VCPU_REGS_R15] = regs->r15;
3089 #endif
3090
3091         vcpu->arch.rip = regs->rip;
3092         kvm_x86_ops->set_rflags(vcpu, regs->rflags);
3093
3094         kvm_x86_ops->decache_regs(vcpu);
3095
3096         vcpu->arch.exception.pending = false;
3097
3098         vcpu_put(vcpu);
3099
3100         return 0;
3101 }
3102
3103 static void get_segment(struct kvm_vcpu *vcpu,
3104                         struct kvm_segment *var, int seg)
3105 {
3106         kvm_x86_ops->get_segment(vcpu, var, seg);
3107 }
3108
3109 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
3110 {
3111         struct kvm_segment cs;
3112
3113         get_segment(vcpu, &cs, VCPU_SREG_CS);
3114         *db = cs.db;
3115         *l = cs.l;
3116 }
3117 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
3118
3119 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
3120                                   struct kvm_sregs *sregs)
3121 {
3122         struct descriptor_table dt;
3123         int pending_vec;
3124
3125         vcpu_load(vcpu);
3126
3127         get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
3128         get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
3129         get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
3130         get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
3131         get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
3132         get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
3133
3134         get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
3135         get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
3136
3137         kvm_x86_ops->get_idt(vcpu, &dt);
3138         sregs->idt.limit = dt.limit;
3139         sregs->idt.base = dt.base;
3140         kvm_x86_ops->get_gdt(vcpu, &dt);
3141         sregs->gdt.limit = dt.limit;
3142         sregs->gdt.base = dt.base;
3143
3144         kvm_x86_ops->decache_cr4_guest_bits(vcpu);
3145         sregs->cr0 = vcpu->arch.cr0;
3146         sregs->cr2 = vcpu->arch.cr2;
3147         sregs->cr3 = vcpu->arch.cr3;
3148         sregs->cr4 = vcpu->arch.cr4;
3149         sregs->cr8 = kvm_get_cr8(vcpu);
3150         sregs->efer = vcpu->arch.shadow_efer;
3151         sregs->apic_base = kvm_get_apic_base(vcpu);
3152
3153         if (irqchip_in_kernel(vcpu->kvm)) {
3154                 memset(sregs->interrupt_bitmap, 0,
3155                        sizeof sregs->interrupt_bitmap);
3156                 pending_vec = kvm_x86_ops->get_irq(vcpu);
3157                 if (pending_vec >= 0)
3158                         set_bit(pending_vec,
3159                                 (unsigned long *)sregs->interrupt_bitmap);
3160         } else
3161                 memcpy(sregs->interrupt_bitmap, vcpu->arch.irq_pending,
3162                        sizeof sregs->interrupt_bitmap);
3163
3164         vcpu_put(vcpu);
3165
3166         return 0;
3167 }
3168
3169 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
3170                                     struct kvm_mp_state *mp_state)
3171 {
3172         vcpu_load(vcpu);
3173         mp_state->mp_state = vcpu->arch.mp_state;
3174         vcpu_put(vcpu);
3175         return 0;
3176 }
3177
3178 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
3179                                     struct kvm_mp_state *mp_state)
3180 {
3181         vcpu_load(vcpu);
3182         vcpu->arch.mp_state = mp_state->mp_state;
3183         vcpu_put(vcpu);
3184         return 0;
3185 }
3186
3187 static void set_segment(struct kvm_vcpu *vcpu,
3188                         struct kvm_segment *var, int seg)
3189 {
3190         kvm_x86_ops->set_segment(vcpu, var, seg);
3191 }
3192
3193 static void seg_desct_to_kvm_desct(struct desc_struct *seg_desc, u16 selector,
3194                                    struct kvm_segment *kvm_desct)
3195 {
3196         kvm_desct->base = seg_desc->base0;
3197         kvm_desct->base |= seg_desc->base1 << 16;
3198         kvm_desct->base |= seg_desc->base2 << 24;
3199         kvm_desct->limit = seg_desc->limit0;
3200         kvm_desct->limit |= seg_desc->limit << 16;
3201         kvm_desct->selector = selector;
3202         kvm_desct->type = seg_desc->type;
3203         kvm_desct->present = seg_desc->p;
3204         kvm_desct->dpl = seg_desc->dpl;
3205         kvm_desct->db = seg_desc->d;
3206         kvm_desct->s = seg_desc->s;
3207         kvm_desct->l = seg_desc->l;
3208         kvm_desct->g = seg_desc->g;
3209         kvm_desct->avl = seg_desc->avl;
3210         if (!selector)
3211                 kvm_desct->unusable = 1;
3212         else
3213                 kvm_desct->unusable = 0;
3214         kvm_desct->padding = 0;
3215 }
3216
3217 static void get_segment_descritptor_dtable(struct kvm_vcpu *vcpu,
3218                                            u16 selector,
3219                                            struct descriptor_table *dtable)
3220 {
3221         if (selector & 1 << 2) {
3222                 struct kvm_segment kvm_seg;
3223
3224                 get_segment(vcpu, &kvm_seg, VCPU_SREG_LDTR);
3225
3226                 if (kvm_seg.unusable)
3227                         dtable->limit = 0;
3228                 else
3229                         dtable->limit = kvm_seg.limit;
3230                 dtable->base = kvm_seg.base;
3231         }
3232         else
3233                 kvm_x86_ops->get_gdt(vcpu, dtable);
3234 }
3235
3236 /* allowed just for 8 bytes segments */
3237 static int load_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
3238                                          struct desc_struct *seg_desc)
3239 {
3240         struct descriptor_table dtable;
3241         u16 index = selector >> 3;
3242
3243         get_segment_descritptor_dtable(vcpu, selector, &dtable);
3244
3245         if (dtable.limit < index * 8 + 7) {
3246                 kvm_queue_exception_e(vcpu, GP_VECTOR, selector & 0xfffc);
3247                 return 1;
3248         }
3249         return kvm_read_guest(vcpu->kvm, dtable.base + index * 8, seg_desc, 8);
3250 }
3251
3252 /* allowed just for 8 bytes segments */
3253 static int save_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
3254                                          struct desc_struct *seg_desc)
3255 {
3256         struct descriptor_table dtable;
3257         u16 index = selector >> 3;
3258
3259         get_segment_descritptor_dtable(vcpu, selector, &dtable);
3260
3261         if (dtable.limit < index * 8 + 7)
3262                 return 1;
3263         return kvm_write_guest(vcpu->kvm, dtable.base + index * 8, seg_desc, 8);
3264 }
3265
3266 static u32 get_tss_base_addr(struct kvm_vcpu *vcpu,
3267                              struct desc_struct *seg_desc)
3268 {
3269         u32 base_addr;
3270
3271         base_addr = seg_desc->base0;
3272         base_addr |= (seg_desc->base1 << 16);
3273         base_addr |= (seg_desc->base2 << 24);
3274
3275         return base_addr;
3276 }
3277
3278 static int load_tss_segment32(struct kvm_vcpu *vcpu,
3279                               struct desc_struct *seg_desc,
3280                               struct tss_segment_32 *tss)
3281 {
3282         u32 base_addr;
3283
3284         base_addr = get_tss_base_addr(vcpu, seg_desc);
3285
3286         return kvm_read_guest(vcpu->kvm, base_addr, tss,
3287                               sizeof(struct tss_segment_32));
3288 }
3289
3290 static int save_tss_segment32(struct kvm_vcpu *vcpu,
3291                               struct desc_struct *seg_desc,
3292                               struct tss_segment_32 *tss)
3293 {
3294         u32 base_addr;
3295
3296         base_addr = get_tss_base_addr(vcpu, seg_desc);
3297
3298         return kvm_write_guest(vcpu->kvm, base_addr, tss,
3299                                sizeof(struct tss_segment_32));
3300 }
3301
3302 static int load_tss_segment16(struct kvm_vcpu *vcpu,
3303                               struct desc_struct *seg_desc,
3304                               struct tss_segment_16 *tss)
3305 {
3306         u32 base_addr;
3307
3308         base_addr = get_tss_base_addr(vcpu, seg_desc);
3309
3310         return kvm_read_guest(vcpu->kvm, base_addr, tss,
3311                               sizeof(struct tss_segment_16));
3312 }
3313
3314 static int save_tss_segment16(struct kvm_vcpu *vcpu,
3315                               struct desc_struct *seg_desc,
3316                               struct tss_segment_16 *tss)
3317 {
3318         u32 base_addr;
3319
3320         base_addr = get_tss_base_addr(vcpu, seg_desc);
3321
3322         return kvm_write_guest(vcpu->kvm, base_addr, tss,
3323                                sizeof(struct tss_segment_16));
3324 }
3325
3326 static u16 get_segment_selector(struct kvm_vcpu *vcpu, int seg)
3327 {
3328         struct kvm_segment kvm_seg;
3329
3330         get_segment(vcpu, &kvm_seg, seg);
3331         return kvm_seg.selector;
3332 }
3333
3334 static int load_segment_descriptor_to_kvm_desct(struct kvm_vcpu *vcpu,
3335                                                 u16 selector,
3336                                                 struct kvm_segment *kvm_seg)
3337 {
3338         struct desc_struct seg_desc;
3339
3340         if (load_guest_segment_descriptor(vcpu, selector, &seg_desc))
3341                 return 1;
3342         seg_desct_to_kvm_desct(&seg_desc, selector, kvm_seg);
3343         return 0;
3344 }
3345
3346 static int load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
3347                                    int type_bits, int seg)
3348 {
3349         struct kvm_segment kvm_seg;
3350
3351         if (load_segment_descriptor_to_kvm_desct(vcpu, selector, &kvm_seg))
3352                 return 1;
3353         kvm_seg.type |= type_bits;
3354
3355         if (seg != VCPU_SREG_SS && seg != VCPU_SREG_CS &&
3356             seg != VCPU_SREG_LDTR)
3357                 if (!kvm_seg.s)
3358                         kvm_seg.unusable = 1;
3359
3360         set_segment(vcpu, &kvm_seg, seg);
3361         return 0;
3362 }
3363
3364 static void save_state_to_tss32(struct kvm_vcpu *vcpu,
3365                                 struct tss_segment_32 *tss)
3366 {
3367         tss->cr3 = vcpu->arch.cr3;
3368         tss->eip = vcpu->arch.rip;
3369         tss->eflags = kvm_x86_ops->get_rflags(vcpu);
3370         tss->eax = vcpu->arch.regs[VCPU_REGS_RAX];
3371         tss->ecx = vcpu->arch.regs[VCPU_REGS_RCX];
3372         tss->edx = vcpu->arch.regs[VCPU_REGS_RDX];
3373         tss->ebx = vcpu->arch.regs[VCPU_REGS_RBX];
3374         tss->esp = vcpu->arch.regs[VCPU_REGS_RSP];
3375         tss->ebp = vcpu->arch.regs[VCPU_REGS_RBP];
3376         tss->esi = vcpu->arch.regs[VCPU_REGS_RSI];
3377         tss->edi = vcpu->arch.regs[VCPU_REGS_RDI];
3378
3379         tss->es = get_segment_selector(vcpu, VCPU_SREG_ES);
3380         tss->cs = get_segment_selector(vcpu, VCPU_SREG_CS);
3381         tss->ss = get_segment_selector(vcpu, VCPU_SREG_SS);
3382         tss->ds = get_segment_selector(vcpu, VCPU_SREG_DS);
3383         tss->fs = get_segment_selector(vcpu, VCPU_SREG_FS);
3384         tss->gs = get_segment_selector(vcpu, VCPU_SREG_GS);
3385         tss->ldt_selector = get_segment_selector(vcpu, VCPU_SREG_LDTR);
3386         tss->prev_task_link = get_segment_selector(vcpu, VCPU_SREG_TR);
3387 }
3388
3389 static int load_state_from_tss32(struct kvm_vcpu *vcpu,
3390                                   struct tss_segment_32 *tss)
3391 {
3392         kvm_set_cr3(vcpu, tss->cr3);
3393
3394         vcpu->arch.rip = tss->eip;
3395         kvm_x86_ops->set_rflags(vcpu, tss->eflags | 2);
3396
3397         vcpu->arch.regs[VCPU_REGS_RAX] = tss->eax;
3398         vcpu->arch.regs[VCPU_REGS_RCX] = tss->ecx;
3399         vcpu->arch.regs[VCPU_REGS_RDX] = tss->edx;
3400         vcpu->arch.regs[VCPU_REGS_RBX] = tss->ebx;
3401         vcpu->arch.regs[VCPU_REGS_RSP] = tss->esp;
3402         vcpu->arch.regs[VCPU_REGS_RBP] = tss->ebp;
3403         vcpu->arch.regs[VCPU_REGS_RSI] = tss->esi;
3404         vcpu->arch.regs[VCPU_REGS_RDI] = tss->edi;
3405
3406         if (load_segment_descriptor(vcpu, tss->ldt_selector, 0, VCPU_SREG_LDTR))
3407                 return 1;
3408
3409         if (load_segment_descriptor(vcpu, tss->es, 1, VCPU_SREG_ES))
3410                 return 1;
3411
3412         if (load_segment_descriptor(vcpu, tss->cs, 9, VCPU_SREG_CS))
3413                 return 1;
3414
3415         if (load_segment_descriptor(vcpu, tss->ss, 1, VCPU_SREG_SS))
3416                 return 1;
3417
3418         if (load_segment_descriptor(vcpu, tss->ds, 1, VCPU_SREG_DS))
3419                 return 1;
3420
3421         if (load_segment_descriptor(vcpu, tss->fs, 1, VCPU_SREG_FS))
3422                 return 1;
3423
3424         if (load_segment_descriptor(vcpu, tss->gs, 1, VCPU_SREG_GS))
3425                 return 1;
3426         return 0;
3427 }
3428
3429 static void save_state_to_tss16(struct kvm_vcpu *vcpu,
3430                                 struct tss_segment_16 *tss)
3431 {
3432         tss->ip = vcpu->arch.rip;
3433         tss->flag = kvm_x86_ops->get_rflags(vcpu);
3434         tss->ax = vcpu->arch.regs[VCPU_REGS_RAX];
3435         tss->cx = vcpu->arch.regs[VCPU_REGS_RCX];
3436         tss->dx = vcpu->arch.regs[VCPU_REGS_RDX];
3437         tss->bx = vcpu->arch.regs[VCPU_REGS_RBX];
3438         tss->sp = vcpu->arch.regs[VCPU_REGS_RSP];
3439         tss->bp = vcpu->arch.regs[VCPU_REGS_RBP];
3440         tss->si = vcpu->arch.regs[VCPU_REGS_RSI];
3441         tss->di = vcpu->arch.regs[VCPU_REGS_RDI];
3442
3443         tss->es = get_segment_selector(vcpu, VCPU_SREG_ES);
3444         tss->cs = get_segment_selector(vcpu, VCPU_SREG_CS);
3445         tss->ss = get_segment_selector(vcpu, VCPU_SREG_SS);
3446         tss->ds = get_segment_selector(vcpu, VCPU_SREG_DS);
3447         tss->ldt = get_segment_selector(vcpu, VCPU_SREG_LDTR);
3448         tss->prev_task_link = get_segment_selector(vcpu, VCPU_SREG_TR);
3449 }
3450
3451 static int load_state_from_tss16(struct kvm_vcpu *vcpu,
3452                                  struct tss_segment_16 *tss)
3453 {
3454         vcpu->arch.rip = tss->ip;
3455         kvm_x86_ops->set_rflags(vcpu, tss->flag | 2);
3456         vcpu->arch.regs[VCPU_REGS_RAX] = tss->ax;
3457         vcpu->arch.regs[VCPU_REGS_RCX] = tss->cx;
3458         vcpu->arch.regs[VCPU_REGS_RDX] = tss->dx;
3459         vcpu->arch.regs[VCPU_REGS_RBX] = tss->bx;
3460         vcpu->arch.regs[VCPU_REGS_RSP] = tss->sp;
3461         vcpu->arch.regs[VCPU_REGS_RBP] = tss->bp;
3462         vcpu->arch.regs[VCPU_REGS_RSI] = tss->si;
3463         vcpu->arch.regs[VCPU_REGS_RDI] = tss->di;
3464
3465         if (load_segment_descriptor(vcpu, tss->ldt, 0, VCPU_SREG_LDTR))
3466                 return 1;
3467
3468         if (load_segment_descriptor(vcpu, tss->es, 1, VCPU_SREG_ES))
3469                 return 1;
3470
3471         if (load_segment_descriptor(vcpu, tss->cs, 9, VCPU_SREG_CS))
3472                 return 1;
3473
3474         if (load_segment_descriptor(vcpu, tss->ss, 1, VCPU_SREG_SS))
3475                 return 1;
3476
3477         if (load_segment_descriptor(vcpu, tss->ds, 1, VCPU_SREG_DS))
3478                 return 1;
3479         return 0;
3480 }
3481
3482 static int kvm_task_switch_16(struct kvm_vcpu *vcpu, u16 tss_selector,
3483                        struct desc_struct *cseg_desc,
3484                        struct desc_struct *nseg_desc)
3485 {
3486         struct tss_segment_16 tss_segment_16;
3487         int ret = 0;
3488
3489         if (load_tss_segment16(vcpu, cseg_desc, &tss_segment_16))
3490                 goto out;
3491
3492         save_state_to_tss16(vcpu, &tss_segment_16);
3493         save_tss_segment16(vcpu, cseg_desc, &tss_segment_16);
3494
3495         if (load_tss_segment16(vcpu, nseg_desc, &tss_segment_16))
3496                 goto out;
3497         if (load_state_from_tss16(vcpu, &tss_segment_16))
3498                 goto out;
3499
3500         ret = 1;
3501 out:
3502         return ret;
3503 }
3504
3505 static int kvm_task_switch_32(struct kvm_vcpu *vcpu, u16 tss_selector,
3506                        struct desc_struct *cseg_desc,
3507                        struct desc_struct *nseg_desc)
3508 {
3509         struct tss_segment_32 tss_segment_32;
3510         int ret = 0;
3511
3512         if (load_tss_segment32(vcpu, cseg_desc, &tss_segment_32))
3513                 goto out;
3514
3515         save_state_to_tss32(vcpu, &tss_segment_32);
3516         save_tss_segment32(vcpu, cseg_desc, &tss_segment_32);
3517
3518         if (load_tss_segment32(vcpu, nseg_desc, &tss_segment_32))
3519                 goto out;
3520         if (load_state_from_tss32(vcpu, &tss_segment_32))
3521                 goto out;
3522
3523         ret = 1;
3524 out:
3525         return ret;
3526 }
3527
3528 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason)
3529 {
3530         struct kvm_segment tr_seg;
3531         struct desc_struct cseg_desc;
3532         struct desc_struct nseg_desc;
3533         int ret = 0;
3534
3535         get_segment(vcpu, &tr_seg, VCPU_SREG_TR);
3536
3537         if (load_guest_segment_descriptor(vcpu, tss_selector, &nseg_desc))
3538                 goto out;
3539
3540         if (load_guest_segment_descriptor(vcpu, tr_seg.selector, &cseg_desc))
3541                 goto out;
3542
3543
3544         if (reason != TASK_SWITCH_IRET) {
3545                 int cpl;
3546
3547                 cpl = kvm_x86_ops->get_cpl(vcpu);
3548                 if ((tss_selector & 3) > nseg_desc.dpl || cpl > nseg_desc.dpl) {
3549                         kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
3550                         return 1;
3551                 }
3552         }
3553
3554         if (!nseg_desc.p || (nseg_desc.limit0 | nseg_desc.limit << 16) < 0x67) {
3555                 kvm_queue_exception_e(vcpu, TS_VECTOR, tss_selector & 0xfffc);
3556                 return 1;
3557         }
3558
3559         if (reason == TASK_SWITCH_IRET || reason == TASK_SWITCH_JMP) {
3560                 cseg_desc.type &= ~(1 << 1); //clear the B flag
3561                 save_guest_segment_descriptor(vcpu, tr_seg.selector,
3562                                               &cseg_desc);
3563         }
3564
3565         if (reason == TASK_SWITCH_IRET) {
3566                 u32 eflags = kvm_x86_ops->get_rflags(vcpu);
3567                 kvm_x86_ops->set_rflags(vcpu, eflags & ~X86_EFLAGS_NT);
3568         }
3569
3570         kvm_x86_ops->skip_emulated_instruction(vcpu);
3571         kvm_x86_ops->cache_regs(vcpu);
3572
3573         if (nseg_desc.type & 8)
3574                 ret = kvm_task_switch_32(vcpu, tss_selector, &cseg_desc,
3575                                          &nseg_desc);
3576         else
3577                 ret = kvm_task_switch_16(vcpu, tss_selector, &cseg_desc,
3578                                          &nseg_desc);
3579
3580         if (reason == TASK_SWITCH_CALL || reason == TASK_SWITCH_GATE) {
3581                 u32 eflags = kvm_x86_ops->get_rflags(vcpu);
3582                 kvm_x86_ops->set_rflags(vcpu, eflags | X86_EFLAGS_NT);
3583         }
3584
3585         if (reason != TASK_SWITCH_IRET) {
3586                 nseg_desc.type |= (1 << 1);
3587                 save_guest_segment_descriptor(vcpu, tss_selector,
3588                                               &nseg_desc);
3589         }
3590
3591         kvm_x86_ops->set_cr0(vcpu, vcpu->arch.cr0 | X86_CR0_TS);
3592         seg_desct_to_kvm_desct(&nseg_desc, tss_selector, &tr_seg);
3593         tr_seg.type = 11;
3594         set_segment(vcpu, &tr_seg, VCPU_SREG_TR);
3595 out:
3596         kvm_x86_ops->decache_regs(vcpu);
3597         return ret;
3598 }
3599 EXPORT_SYMBOL_GPL(kvm_task_switch);
3600
3601 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
3602                                   struct kvm_sregs *sregs)
3603 {
3604         int mmu_reset_needed = 0;
3605         int i, pending_vec, max_bits;
3606         struct descriptor_table dt;
3607
3608         vcpu_load(vcpu);
3609
3610         dt.limit = sregs->idt.limit;
3611         dt.base = sregs->idt.base;
3612         kvm_x86_ops->set_idt(vcpu, &dt);
3613         dt.limit = sregs->gdt.limit;
3614         dt.base = sregs->gdt.base;
3615         kvm_x86_ops->set_gdt(vcpu, &dt);
3616
3617         vcpu->arch.cr2 = sregs->cr2;
3618         mmu_reset_needed |= vcpu->arch.cr3 != sregs->cr3;
3619         vcpu->arch.cr3 = sregs->cr3;
3620
3621         kvm_set_cr8(vcpu, sregs->cr8);
3622
3623         mmu_reset_needed |= vcpu->arch.shadow_efer != sregs->efer;
3624         kvm_x86_ops->set_efer(vcpu, sregs->efer);
3625         kvm_set_apic_base(vcpu, sregs->apic_base);
3626
3627         kvm_x86_ops->decache_cr4_guest_bits(vcpu);
3628
3629         mmu_reset_needed |= vcpu->arch.cr0 != sregs->cr0;
3630         kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
3631         vcpu->arch.cr0 = sregs->cr0;
3632
3633         mmu_reset_needed |= vcpu->arch.cr4 != sregs->cr4;
3634         kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
3635         if (!is_long_mode(vcpu) && is_pae(vcpu))
3636                 load_pdptrs(vcpu, vcpu->arch.cr3);
3637
3638         if (mmu_reset_needed)
3639                 kvm_mmu_reset_context(vcpu);
3640
3641         if (!irqchip_in_kernel(vcpu->kvm)) {
3642                 memcpy(vcpu->arch.irq_pending, sregs->interrupt_bitmap,
3643                        sizeof vcpu->arch.irq_pending);
3644                 vcpu->arch.irq_summary = 0;
3645                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.irq_pending); ++i)
3646                         if (vcpu->arch.irq_pending[i])
3647                                 __set_bit(i, &vcpu->arch.irq_summary);
3648         } else {
3649                 max_bits = (sizeof sregs->interrupt_bitmap) << 3;
3650                 pending_vec = find_first_bit(
3651                         (const unsigned long *)sregs->interrupt_bitmap,
3652                         max_bits);
3653                 /* Only pending external irq is handled here */
3654                 if (pending_vec < max_bits) {
3655                         kvm_x86_ops->set_irq(vcpu, pending_vec);
3656                         pr_debug("Set back pending irq %d\n",
3657                                  pending_vec);
3658                 }
3659         }
3660
3661         set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
3662         set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
3663         set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
3664         set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
3665         set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
3666         set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
3667
3668         set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
3669         set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
3670
3671         vcpu_put(vcpu);
3672
3673         return 0;
3674 }
3675
3676 int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
3677                                     struct kvm_debug_guest *dbg)
3678 {
3679         int r;
3680
3681         vcpu_load(vcpu);
3682
3683         r = kvm_x86_ops->set_guest_debug(vcpu, dbg);
3684
3685         vcpu_put(vcpu);
3686
3687         return r;
3688 }
3689
3690 /*
3691  * fxsave fpu state.  Taken from x86_64/processor.h.  To be killed when
3692  * we have asm/x86/processor.h
3693  */
3694 struct fxsave {
3695         u16     cwd;
3696         u16     swd;
3697         u16     twd;
3698         u16     fop;
3699         u64     rip;
3700         u64     rdp;
3701         u32     mxcsr;
3702         u32     mxcsr_mask;
3703         u32     st_space[32];   /* 8*16 bytes for each FP-reg = 128 bytes */
3704 #ifdef CONFIG_X86_64
3705         u32     xmm_space[64];  /* 16*16 bytes for each XMM-reg = 256 bytes */
3706 #else
3707         u32     xmm_space[32];  /* 8*16 bytes for each XMM-reg = 128 bytes */
3708 #endif
3709 };
3710
3711 /*
3712  * Translate a guest virtual address to a guest physical address.
3713  */
3714 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
3715                                     struct kvm_translation *tr)
3716 {
3717         unsigned long vaddr = tr->linear_address;
3718         gpa_t gpa;
3719
3720         vcpu_load(vcpu);
3721         down_read(&vcpu->kvm->slots_lock);
3722         gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, vaddr);
3723         up_read(&vcpu->kvm->slots_lock);
3724         tr->physical_address = gpa;
3725         tr->valid = gpa != UNMAPPED_GVA;
3726         tr->writeable = 1;
3727         tr->usermode = 0;
3728         vcpu_put(vcpu);
3729
3730         return 0;
3731 }
3732
3733 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
3734 {
3735         struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
3736
3737         vcpu_load(vcpu);
3738
3739         memcpy(fpu->fpr, fxsave->st_space, 128);
3740         fpu->fcw = fxsave->cwd;
3741         fpu->fsw = fxsave->swd;
3742         fpu->ftwx = fxsave->twd;
3743         fpu->last_opcode = fxsave->fop;
3744         fpu->last_ip = fxsave->rip;
3745         fpu->last_dp = fxsave->rdp;
3746         memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
3747
3748         vcpu_put(vcpu);
3749
3750         return 0;
3751 }
3752
3753 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
3754 {
3755         struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
3756
3757         vcpu_load(vcpu);
3758
3759         memcpy(fxsave->st_space, fpu->fpr, 128);
3760         fxsave->cwd = fpu->fcw;
3761         fxsave->swd = fpu->fsw;
3762         fxsave->twd = fpu->ftwx;
3763         fxsave->fop = fpu->last_opcode;
3764         fxsave->rip = fpu->last_ip;
3765         fxsave->rdp = fpu->last_dp;
3766         memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
3767
3768         vcpu_put(vcpu);
3769
3770         return 0;
3771 }
3772
3773 void fx_init(struct kvm_vcpu *vcpu)
3774 {
3775         unsigned after_mxcsr_mask;
3776
3777         /*
3778          * Touch the fpu the first time in non atomic context as if
3779          * this is the first fpu instruction the exception handler
3780          * will fire before the instruction returns and it'll have to
3781          * allocate ram with GFP_KERNEL.
3782          */
3783         if (!used_math())
3784                 fx_save(&vcpu->arch.host_fx_image);
3785
3786         /* Initialize guest FPU by resetting ours and saving into guest's */
3787         preempt_disable();
3788         fx_save(&vcpu->arch.host_fx_image);
3789         fx_finit();
3790         fx_save(&vcpu->arch.guest_fx_image);
3791         fx_restore(&vcpu->arch.host_fx_image);
3792         preempt_enable();
3793
3794         vcpu->arch.cr0 |= X86_CR0_ET;
3795         after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
3796         vcpu->arch.guest_fx_image.mxcsr = 0x1f80;
3797         memset((void *)&vcpu->arch.guest_fx_image + after_mxcsr_mask,
3798                0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
3799 }
3800 EXPORT_SYMBOL_GPL(fx_init);
3801
3802 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
3803 {
3804         if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
3805                 return;
3806
3807         vcpu->guest_fpu_loaded = 1;
3808         fx_save(&vcpu->arch.host_fx_image);
3809         fx_restore(&vcpu->arch.guest_fx_image);
3810 }
3811 EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
3812
3813 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
3814 {
3815         if (!vcpu->guest_fpu_loaded)
3816                 return;
3817
3818         vcpu->guest_fpu_loaded = 0;
3819         fx_save(&vcpu->arch.guest_fx_image);
3820         fx_restore(&vcpu->arch.host_fx_image);
3821         ++vcpu->stat.fpu_reload;
3822 }
3823 EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
3824
3825 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
3826 {
3827         kvm_x86_ops->vcpu_free(vcpu);
3828 }
3829
3830 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
3831                                                 unsigned int id)
3832 {
3833         return kvm_x86_ops->vcpu_create(kvm, id);
3834 }
3835
3836 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
3837 {
3838         int r;
3839
3840         /* We do fxsave: this must be aligned. */
3841         BUG_ON((unsigned long)&vcpu->arch.host_fx_image & 0xF);
3842
3843         vcpu_load(vcpu);
3844         r = kvm_arch_vcpu_reset(vcpu);
3845         if (r == 0)
3846                 r = kvm_mmu_setup(vcpu);
3847         vcpu_put(vcpu);
3848         if (r < 0)
3849                 goto free_vcpu;
3850
3851         return 0;
3852 free_vcpu:
3853         kvm_x86_ops->vcpu_free(vcpu);
3854         return r;
3855 }
3856
3857 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
3858 {
3859         vcpu_load(vcpu);
3860         kvm_mmu_unload(vcpu);
3861         vcpu_put(vcpu);
3862
3863         kvm_x86_ops->vcpu_free(vcpu);
3864 }
3865
3866 int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
3867 {
3868         return kvm_x86_ops->vcpu_reset(vcpu);
3869 }
3870
3871 void kvm_arch_hardware_enable(void *garbage)
3872 {
3873         kvm_x86_ops->hardware_enable(garbage);
3874 }
3875
3876 void kvm_arch_hardware_disable(void *garbage)
3877 {
3878         kvm_x86_ops->hardware_disable(garbage);
3879 }
3880
3881 int kvm_arch_hardware_setup(void)
3882 {
3883         return kvm_x86_ops->hardware_setup();
3884 }
3885
3886 void kvm_arch_hardware_unsetup(void)
3887 {
3888         kvm_x86_ops->hardware_unsetup();
3889 }
3890
3891 void kvm_arch_check_processor_compat(void *rtn)
3892 {
3893         kvm_x86_ops->check_processor_compatibility(rtn);
3894 }
3895
3896 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
3897 {
3898         struct page *page;
3899         struct kvm *kvm;
3900         int r;
3901
3902         BUG_ON(vcpu->kvm == NULL);
3903         kvm = vcpu->kvm;
3904
3905         vcpu->arch.mmu.root_hpa = INVALID_PAGE;
3906         if (!irqchip_in_kernel(kvm) || vcpu->vcpu_id == 0)
3907                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
3908         else
3909                 vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
3910
3911         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3912         if (!page) {
3913                 r = -ENOMEM;
3914                 goto fail;
3915         }
3916         vcpu->arch.pio_data = page_address(page);
3917
3918         r = kvm_mmu_create(vcpu);
3919         if (r < 0)
3920                 goto fail_free_pio_data;
3921
3922         if (irqchip_in_kernel(kvm)) {
3923                 r = kvm_create_lapic(vcpu);
3924                 if (r < 0)
3925                         goto fail_mmu_destroy;
3926         }
3927
3928         return 0;
3929
3930 fail_mmu_destroy:
3931         kvm_mmu_destroy(vcpu);
3932 fail_free_pio_data:
3933         free_page((unsigned long)vcpu->arch.pio_data);
3934 fail:
3935         return r;
3936 }
3937
3938 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
3939 {
3940         kvm_free_lapic(vcpu);
3941         down_read(&vcpu->kvm->slots_lock);
3942         kvm_mmu_destroy(vcpu);
3943         up_read(&vcpu->kvm->slots_lock);
3944         free_page((unsigned long)vcpu->arch.pio_data);
3945 }
3946
3947 struct  kvm *kvm_arch_create_vm(void)
3948 {
3949         struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
3950
3951         if (!kvm)
3952                 return ERR_PTR(-ENOMEM);
3953
3954         INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
3955
3956         return kvm;
3957 }
3958
3959 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
3960 {
3961         vcpu_load(vcpu);
3962         kvm_mmu_unload(vcpu);
3963         vcpu_put(vcpu);
3964 }
3965
3966 static void kvm_free_vcpus(struct kvm *kvm)
3967 {
3968         unsigned int i;
3969
3970         /*
3971          * Unpin any mmu pages first.
3972          */
3973         for (i = 0; i < KVM_MAX_VCPUS; ++i)
3974                 if (kvm->vcpus[i])
3975                         kvm_unload_vcpu_mmu(kvm->vcpus[i]);
3976         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
3977                 if (kvm->vcpus[i]) {
3978                         kvm_arch_vcpu_free(kvm->vcpus[i]);
3979                         kvm->vcpus[i] = NULL;
3980                 }
3981         }
3982
3983 }
3984
3985 void kvm_arch_destroy_vm(struct kvm *kvm)
3986 {
3987         kvm_free_pit(kvm);
3988         kfree(kvm->arch.vpic);
3989         kfree(kvm->arch.vioapic);
3990         kvm_free_vcpus(kvm);
3991         kvm_free_physmem(kvm);
3992         if (kvm->arch.apic_access_page)
3993                 put_page(kvm->arch.apic_access_page);
3994         if (kvm->arch.ept_identity_pagetable)
3995                 put_page(kvm->arch.ept_identity_pagetable);
3996         kfree(kvm);
3997 }
3998
3999 int kvm_arch_set_memory_region(struct kvm *kvm,
4000                                 struct kvm_userspace_memory_region *mem,
4001                                 struct kvm_memory_slot old,
4002                                 int user_alloc)
4003 {
4004         int npages = mem->memory_size >> PAGE_SHIFT;
4005         struct kvm_memory_slot *memslot = &kvm->memslots[mem->slot];
4006
4007         /*To keep backward compatibility with older userspace,
4008          *x86 needs to hanlde !user_alloc case.
4009          */
4010         if (!user_alloc) {
4011                 if (npages && !old.rmap) {
4012                         down_write(&current->mm->mmap_sem);
4013                         memslot->userspace_addr = do_mmap(NULL, 0,
4014                                                      npages * PAGE_SIZE,
4015                                                      PROT_READ | PROT_WRITE,
4016                                                      MAP_SHARED | MAP_ANONYMOUS,
4017                                                      0);
4018                         up_write(&current->mm->mmap_sem);
4019
4020                         if (IS_ERR((void *)memslot->userspace_addr))
4021                                 return PTR_ERR((void *)memslot->userspace_addr);
4022                 } else {
4023                         if (!old.user_alloc && old.rmap) {
4024                                 int ret;
4025
4026                                 down_write(&current->mm->mmap_sem);
4027                                 ret = do_munmap(current->mm, old.userspace_addr,
4028                                                 old.npages * PAGE_SIZE);
4029                                 up_write(&current->mm->mmap_sem);
4030                                 if (ret < 0)
4031                                         printk(KERN_WARNING
4032                                        "kvm_vm_ioctl_set_memory_region: "
4033                                        "failed to munmap memory\n");
4034                         }
4035                 }
4036         }
4037
4038         if (!kvm->arch.n_requested_mmu_pages) {
4039                 unsigned int nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
4040                 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
4041         }
4042
4043         kvm_mmu_slot_remove_write_access(kvm, mem->slot);
4044         kvm_flush_remote_tlbs(kvm);
4045
4046         return 0;
4047 }
4048
4049 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
4050 {
4051         return vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE
4052                || vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED;
4053 }
4054
4055 static void vcpu_kick_intr(void *info)
4056 {
4057 #ifdef DEBUG
4058         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)info;
4059         printk(KERN_DEBUG "vcpu_kick_intr %p \n", vcpu);
4060 #endif
4061 }
4062
4063 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
4064 {
4065         int ipi_pcpu = vcpu->cpu;
4066         int cpu = get_cpu();
4067
4068         if (waitqueue_active(&vcpu->wq)) {
4069                 wake_up_interruptible(&vcpu->wq);
4070                 ++vcpu->stat.halt_wakeup;
4071         }
4072         /*
4073          * We may be called synchronously with irqs disabled in guest mode,
4074          * So need not to call smp_call_function_single() in that case.
4075          */
4076         if (vcpu->guest_mode && vcpu->cpu != cpu)
4077                 smp_call_function_single(ipi_pcpu, vcpu_kick_intr, vcpu, 0);
4078         put_cpu();
4079 }