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         { "halt_exits", VCPU_STAT(halt_exits) },
  76         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
  77         { "hypercalls", VCPU_STAT(hypercalls) },
  78         { "request_irq", VCPU_STAT(request_irq_exits) },
  79         { "irq_exits", VCPU_STAT(irq_exits) },
  80         { "host_state_reload", VCPU_STAT(host_state_reload) },
  81         { "efer_reload", VCPU_STAT(efer_reload) },
  82         { "fpu_reload", VCPU_STAT(fpu_reload) },
  83         { "insn_emulation", VCPU_STAT(insn_emulation) },
  84         { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
  85         { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
  86         { "mmu_pte_write", VM_STAT(mmu_pte_write) },
  87         { "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
  88         { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
  89         { "mmu_flooded", VM_STAT(mmu_flooded) },
  90         { "mmu_recycled", VM_STAT(mmu_recycled) },
  91         { "mmu_cache_miss", VM_STAT(mmu_cache_miss) },
  92         { "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
  93         { "largepages", VM_STAT(lpages) },
  94         { NULL }
  95 };
  96
  97
  98 unsigned long segment_base(u16 selector)
  99 {
 100         struct descriptor_table gdt;
 101         struct desc_struct *d;
 102         unsigned long table_base;
 103         unsigned long v;
 104
 105         if (selector == 0)
 106                 return 0;
 107
 108         asm("sgdt %0" : "=m"(gdt));
 109         table_base = gdt.base;
 110
 111         if (selector & 4) {           /* from ldt */
 112                 u16 ldt_selector;
 113
 114                 asm("sldt %0" : "=g"(ldt_selector));
 115                 table_base = segment_base(ldt_selector);
 116         }
 117         d = (struct desc_struct *)(table_base + (selector & ~7));
 118         v = d->base0 | ((unsigned long)d->base1 << 16) |
 119                 ((unsigned long)d->base2 << 24);
 120 #ifdef CONFIG_X86_64
 121         if (d->s == 0 && (d->type == 2 || d->type == 9 || d->type == 11))
 122                 v |= ((unsigned long)((struct ldttss_desc64 *)d)->base3) << 32;
 123 #endif
 124         return v;
 125 }
 126 EXPORT_SYMBOL_GPL(segment_base);
 127
 128 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
 129 {
 130         if (irqchip_in_kernel(vcpu->kvm))
 131                 return vcpu->arch.apic_base;
 132         else
 133                 return vcpu->arch.apic_base;
 134 }
 135 EXPORT_SYMBOL_GPL(kvm_get_apic_base);
 136
 137 void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
 138 {
 139         /* TODO: reserve bits check */
 140         if (irqchip_in_kernel(vcpu->kvm))
 141                 kvm_lapic_set_base(vcpu, data);
 142         else
 143                 vcpu->arch.apic_base = data;
 144 }
 145 EXPORT_SYMBOL_GPL(kvm_set_apic_base);
 146
 147 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
 148 {
 149         WARN_ON(vcpu->arch.exception.pending);
 150         vcpu->arch.exception.pending = true;
 151         vcpu->arch.exception.has_error_code = false;
 152         vcpu->arch.exception.nr = nr;
 153 }
 154 EXPORT_SYMBOL_GPL(kvm_queue_exception);
 155
 156 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long addr,
 157                            u32 error_code)
 158 {
 159         ++vcpu->stat.pf_guest;
 160         if (vcpu->arch.exception.pending) {
 161                 if (vcpu->arch.exception.nr == PF_VECTOR) {
 162                         printk(KERN_DEBUG "kvm: inject_page_fault:"
 163                                         " double fault 0x%lx\n", addr);
 164                         vcpu->arch.exception.nr = DF_VECTOR;
 165                         vcpu->arch.exception.error_code = 0;
 166                 } else if (vcpu->arch.exception.nr == DF_VECTOR) {
 167                         /* triple fault -> shutdown */
 168                         set_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests);
 169                 }
 170                 return;
 171         }
 172         vcpu->arch.cr2 = addr;
 173         kvm_queue_exception_e(vcpu, PF_VECTOR, error_code);
 174 }
 175
 176 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
 177 {
 178         WARN_ON(vcpu->arch.exception.pending);
 179         vcpu->arch.exception.pending = true;
 180         vcpu->arch.exception.has_error_code = true;
 181         vcpu->arch.exception.nr = nr;
 182         vcpu->arch.exception.error_code = error_code;
 183 }
 184 EXPORT_SYMBOL_GPL(kvm_queue_exception_e);
 185
 186 static void __queue_exception(struct kvm_vcpu *vcpu)
 187 {
 188         kvm_x86_ops->queue_exception(vcpu, vcpu->arch.exception.nr,
 189                                      vcpu->arch.exception.has_error_code,
 190                                      vcpu->arch.exception.error_code);
 191 }
 192
 193 /*
 194  * Load the pae pdptrs.  Return true is they are all valid.
 195  */
 196 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
 197 {
 198         gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
 199         unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
 200         int i;
 201         int ret;
 202         u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
 203
 204         ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte,
 205                                   offset * sizeof(u64), sizeof(pdpte));
 206         if (ret < 0) {
 207                 ret = 0;
 208                 goto out;
 209         }
 210         for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
 211                 if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) {
 212                         ret = 0;
 213                         goto out;
 214                 }
 215         }
 216         ret = 1;
 217
 218         memcpy(vcpu->arch.pdptrs, pdpte, sizeof(vcpu->arch.pdptrs));
 219 out:
 220
 221         return ret;
 222 }
 223 EXPORT_SYMBOL_GPL(load_pdptrs);
 224
 225 static bool pdptrs_changed(struct kvm_vcpu *vcpu)
 226 {
 227         u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
 228         bool changed = true;
 229         int r;
 230
 231         if (is_long_mode(vcpu) || !is_pae(vcpu))
 232                 return false;
 233
 234         r = kvm_read_guest(vcpu->kvm, vcpu->arch.cr3 & ~31u, pdpte, sizeof(pdpte));
 235         if (r < 0)
 236                 goto out;
 237         changed = memcmp(pdpte, vcpu->arch.pdptrs, sizeof(pdpte)) != 0;
 238 out:
 239
 240         return changed;
 241 }
 242
 243 void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 244 {
 245         if (cr0 & CR0_RESERVED_BITS) {
 246                 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
 247                        cr0, vcpu->arch.cr0);
 248                 kvm_inject_gp(vcpu, 0);
 249                 return;
 250         }
 251
 252         if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) {
 253                 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
 254                 kvm_inject_gp(vcpu, 0);
 255                 return;
 256         }
 257
 258         if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) {
 259                 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
 260                        "and a clear PE flag\n");
 261                 kvm_inject_gp(vcpu, 0);
 262                 return;
 263         }
 264
 265         if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
 266 #ifdef CONFIG_X86_64
 267                 if ((vcpu->arch.shadow_efer & EFER_LME)) {
 268                         int cs_db, cs_l;
 269
 270                         if (!is_pae(vcpu)) {
 271                                 printk(KERN_DEBUG "set_cr0: #GP, start paging "
 272                                        "in long mode while PAE is disabled\n");
 273                                 kvm_inject_gp(vcpu, 0);
 274                                 return;
 275                         }
 276                         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
 277                         if (cs_l) {
 278                                 printk(KERN_DEBUG "set_cr0: #GP, start paging "
 279                                        "in long mode while CS.L == 1\n");
 280                                 kvm_inject_gp(vcpu, 0);
 281                                 return;
 282
 283                         }
 284                 } else
 285 #endif
 286                 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.cr3)) {
 287                         printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
 288                                "reserved bits\n");
 289                         kvm_inject_gp(vcpu, 0);
 290                         return;
 291                 }
 292
 293         }
 294
 295         kvm_x86_ops->set_cr0(vcpu, cr0);
 296         vcpu->arch.cr0 = cr0;
 297
 298         kvm_mmu_reset_context(vcpu);
 299         return;
 300 }
 301 EXPORT_SYMBOL_GPL(kvm_set_cr0);
 302
 303 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
 304 {
 305         kvm_set_cr0(vcpu, (vcpu->arch.cr0 & ~0x0ful) | (msw & 0x0f));
 306         KVMTRACE_1D(LMSW, vcpu,
 307                     (u32)((vcpu->arch.cr0 & ~0x0ful) | (msw & 0x0f)),
 308                     handler);
 309 }
 310 EXPORT_SYMBOL_GPL(kvm_lmsw);
 311
 312 void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
 313 {
 314         if (cr4 & CR4_RESERVED_BITS) {
 315                 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
 316                 kvm_inject_gp(vcpu, 0);
 317                 return;
 318         }
 319
 320         if (is_long_mode(vcpu)) {
 321                 if (!(cr4 & X86_CR4_PAE)) {
 322                         printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
 323                                "in long mode\n");
 324                         kvm_inject_gp(vcpu, 0);
 325                         return;
 326                 }
 327         } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & X86_CR4_PAE)
 328                    && !load_pdptrs(vcpu, vcpu->arch.cr3)) {
 329                 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
 330                 kvm_inject_gp(vcpu, 0);
 331                 return;
 332         }
 333
 334         if (cr4 & X86_CR4_VMXE) {
 335                 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
 336                 kvm_inject_gp(vcpu, 0);
 337                 return;
 338         }
 339         kvm_x86_ops->set_cr4(vcpu, cr4);
 340         vcpu->arch.cr4 = cr4;
 341         kvm_mmu_reset_context(vcpu);
 342 }
 343 EXPORT_SYMBOL_GPL(kvm_set_cr4);
 344
 345 void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
 346 {
 347         if (cr3 == vcpu->arch.cr3 && !pdptrs_changed(vcpu)) {
 348                 kvm_mmu_flush_tlb(vcpu);
 349                 return;
 350         }
 351
 352         if (is_long_mode(vcpu)) {
 353                 if (cr3 & CR3_L_MODE_RESERVED_BITS) {
 354                         printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
 355                         kvm_inject_gp(vcpu, 0);
 356                         return;
 357                 }
 358         } else {
 359                 if (is_pae(vcpu)) {
 360                         if (cr3 & CR3_PAE_RESERVED_BITS) {
 361                                 printk(KERN_DEBUG
 362                                        "set_cr3: #GP, reserved bits\n");
 363                                 kvm_inject_gp(vcpu, 0);
 364                                 return;
 365                         }
 366                         if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) {
 367                                 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
 368                                        "reserved bits\n");
 369                                 kvm_inject_gp(vcpu, 0);
 370                                 return;
 371                         }
 372                 }
 373                 /*
 374                  * We don't check reserved bits in nonpae mode, because
 375                  * this isn't enforced, and VMware depends on this.
 376                  */
 377         }
 378
 379         /*
 380          * Does the new cr3 value map to physical memory? (Note, we
 381          * catch an invalid cr3 even in real-mode, because it would
 382          * cause trouble later on when we turn on paging anyway.)
 383          *
 384          * A real CPU would silently accept an invalid cr3 and would
 385          * attempt to use it - with largely undefined (and often hard
 386          * to debug) behavior on the guest side.
 387          */
 388         if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
 389                 kvm_inject_gp(vcpu, 0);
 390         else {
 391                 vcpu->arch.cr3 = cr3;
 392                 vcpu->arch.mmu.new_cr3(vcpu);
 393         }
 394 }
 395 EXPORT_SYMBOL_GPL(kvm_set_cr3);
 396
 397 void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
 398 {
 399         if (cr8 & CR8_RESERVED_BITS) {
 400                 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
 401                 kvm_inject_gp(vcpu, 0);
 402                 return;
 403         }
 404         if (irqchip_in_kernel(vcpu->kvm))
 405                 kvm_lapic_set_tpr(vcpu, cr8);
 406         else
 407                 vcpu->arch.cr8 = cr8;
 408 }
 409 EXPORT_SYMBOL_GPL(kvm_set_cr8);
 410
 411 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu)
 412 {
 413         if (irqchip_in_kernel(vcpu->kvm))
 414                 return kvm_lapic_get_cr8(vcpu);
 415         else
 416                 return vcpu->arch.cr8;
 417 }
 418 EXPORT_SYMBOL_GPL(kvm_get_cr8);
 419
 420 /*
 421  * List of msr numbers which we expose to userspace through KVM_GET_MSRS
 422  * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
 423  *
 424  * This list is modified at module load time to reflect the
 425  * capabilities of the host cpu.
 426  */
 427 static u32 msrs_to_save[] = {
 428         MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
 429         MSR_K6_STAR,
 430 #ifdef CONFIG_X86_64
 431         MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
 432 #endif
 433         MSR_IA32_TIME_STAMP_COUNTER, MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
 434         MSR_IA32_PERF_STATUS,
 435 };
 436
 437 static unsigned num_msrs_to_save;
 438
 439 static u32 emulated_msrs[] = {
 440         MSR_IA32_MISC_ENABLE,
 441 };
 442
 443 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
 444 {
 445         if (efer & efer_reserved_bits) {
 446                 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
 447                        efer);
 448                 kvm_inject_gp(vcpu, 0);
 449                 return;
 450         }
 451
 452         if (is_paging(vcpu)
 453             && (vcpu->arch.shadow_efer & EFER_LME) != (efer & EFER_LME)) {
 454                 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
 455                 kvm_inject_gp(vcpu, 0);
 456                 return;
 457         }
 458
 459         kvm_x86_ops->set_efer(vcpu, efer);
 460
 461         efer &= ~EFER_LMA;
 462         efer |= vcpu->arch.shadow_efer & EFER_LMA;
 463
 464         vcpu->arch.shadow_efer = efer;
 465 }
 466
 467 void kvm_enable_efer_bits(u64 mask)
 468 {
 469        efer_reserved_bits &= ~mask;
 470 }
 471 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);
 472
 473
 474 /*
 475  * Writes msr value into into the appropriate "register".
 476  * Returns 0 on success, non-0 otherwise.
 477  * Assumes vcpu_load() was already called.
 478  */
 479 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
 480 {
 481         return kvm_x86_ops->set_msr(vcpu, msr_index, data);
 482 }
 483
 484 /*
 485  * Adapt set_msr() to msr_io()'s calling convention
 486  */
 487 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
 488 {
 489         return kvm_set_msr(vcpu, index, *data);
 490 }
 491
 492 static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
 493 {
 494         static int version;
 495         struct kvm_wall_clock wc;
 496         struct timespec wc_ts;
 497
 498         if (!wall_clock)
 499                 return;
 500
 501         version++;
 502
 503         kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
 504
 505         wc_ts = current_kernel_time();
 506         wc.wc_sec = wc_ts.tv_sec;
 507         wc.wc_nsec = wc_ts.tv_nsec;
 508         wc.wc_version = version;
 509
 510         kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc));
 511
 512         version++;
 513         kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
 514 }
 515
 516 static void kvm_write_guest_time(struct kvm_vcpu *v)
 517 {
 518         struct timespec ts;
 519         unsigned long flags;
 520         struct kvm_vcpu_arch *vcpu = &v->arch;
 521         void *shared_kaddr;
 522
 523         if ((!vcpu->time_page))
 524                 return;
 525
 526         /* Keep irq disabled to prevent changes to the clock */
 527         local_irq_save(flags);
 528         kvm_get_msr(v, MSR_IA32_TIME_STAMP_COUNTER,
 529                           &vcpu->hv_clock.tsc_timestamp);
 530         ktime_get_ts(&ts);
 531         local_irq_restore(flags);
 532
 533         /* With all the info we got, fill in the values */
 534
 535         vcpu->hv_clock.system_time = ts.tv_nsec +
 536                                      (NSEC_PER_SEC * (u64)ts.tv_sec);
 537         /*
 538          * The interface expects us to write an even number signaling that the
 539          * update is finished. Since the guest won't see the intermediate
 540          * state, we just write "2" at the end
 541          */
 542         vcpu->hv_clock.version = 2;
 543
 544         shared_kaddr = kmap_atomic(vcpu->time_page, KM_USER0);
 545
 546         memcpy(shared_kaddr + vcpu->time_offset, &vcpu->hv_clock,
 547                 sizeof(vcpu->hv_clock));
 548
 549         kunmap_atomic(shared_kaddr, KM_USER0);
 550
 551         mark_page_dirty(v->kvm, vcpu->time >> PAGE_SHIFT);
 552 }
 553
 554
 555 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
 556 {
 557         switch (msr) {
 558         case MSR_EFER:
 559                 set_efer(vcpu, data);
 560                 break;
 561         case MSR_IA32_MC0_STATUS:
 562                 pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
 563                        __func__, data);
 564                 break;
 565         case MSR_IA32_MCG_STATUS:
 566                 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
 567                         __func__, data);
 568                 break;
 569         case MSR_IA32_MCG_CTL:
 570                 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_CTL 0x%llx, nop\n",
 571                         __func__, data);
 572                 break;
 573         case MSR_IA32_UCODE_REV:
 574         case MSR_IA32_UCODE_WRITE:
 575         case 0x200 ... 0x2ff: /* MTRRs */
 576                 break;
 577         case MSR_IA32_APICBASE:
 578                 kvm_set_apic_base(vcpu, data);
 579                 break;
 580         case MSR_IA32_MISC_ENABLE:
 581                 vcpu->arch.ia32_misc_enable_msr = data;
 582                 break;
 583         case MSR_KVM_WALL_CLOCK:
 584                 vcpu->kvm->arch.wall_clock = data;
 585                 kvm_write_wall_clock(vcpu->kvm, data);
 586                 break;
 587         case MSR_KVM_SYSTEM_TIME: {
 588                 if (vcpu->arch.time_page) {
 589                         kvm_release_page_dirty(vcpu->arch.time_page);
 590                         vcpu->arch.time_page = NULL;
 591                 }
 592
 593                 vcpu->arch.time = data;
 594
 595                 /* we verify if the enable bit is set... */
 596                 if (!(data & 1))
 597                         break;
 598
 599                 /* ...but clean it before doing the actual write */
 600                 vcpu->arch.time_offset = data & ~(PAGE_MASK | 1);
 601
 602                 vcpu->arch.hv_clock.tsc_to_system_mul =
 603                                         clocksource_khz2mult(tsc_khz, 22);
 604                 vcpu->arch.hv_clock.tsc_shift = 22;
 605
 606                 down_read(&current->mm->mmap_sem);
 607                 vcpu->arch.time_page =
 608                                 gfn_to_page(vcpu->kvm, data >> PAGE_SHIFT);
 609                 up_read(&current->mm->mmap_sem);
 610
 611                 if (is_error_page(vcpu->arch.time_page)) {
 612                         kvm_release_page_clean(vcpu->arch.time_page);
 613                         vcpu->arch.time_page = NULL;
 614                 }
 615
 616                 kvm_write_guest_time(vcpu);
 617                 break;
 618         }
 619         default:
 620                 pr_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n", msr, data);
 621                 return 1;
 622         }
 623         return 0;
 624 }
 625 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
 626
 627
 628 /*
 629  * Reads an msr value (of 'msr_index') into 'pdata'.
 630  * Returns 0 on success, non-0 otherwise.
 631  * Assumes vcpu_load() was already called.
 632  */
 633 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
 634 {
 635         return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
 636 }
 637
 638 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
 639 {
 640         u64 data;
 641
 642         switch (msr) {
 643         case 0xc0010010: /* SYSCFG */
 644         case 0xc0010015: /* HWCR */
 645         case MSR_IA32_PLATFORM_ID:
 646         case MSR_IA32_P5_MC_ADDR:
 647         case MSR_IA32_P5_MC_TYPE:
 648         case MSR_IA32_MC0_CTL:
 649         case MSR_IA32_MCG_STATUS:
 650         case MSR_IA32_MCG_CAP:
 651         case MSR_IA32_MCG_CTL:
 652         case MSR_IA32_MC0_MISC:
 653         case MSR_IA32_MC0_MISC+4:
 654         case MSR_IA32_MC0_MISC+8:
 655         case MSR_IA32_MC0_MISC+12:
 656         case MSR_IA32_MC0_MISC+16:
 657         case MSR_IA32_UCODE_REV:
 658         case MSR_IA32_EBL_CR_POWERON:
 659                 /* MTRR registers */
 660         case 0xfe:
 661         case 0x200 ... 0x2ff:
 662                 data = 0;
 663                 break;
 664         case 0xcd: /* fsb frequency */
 665                 data = 3;
 666                 break;
 667         case MSR_IA32_APICBASE:
 668                 data = kvm_get_apic_base(vcpu);
 669                 break;
 670         case MSR_IA32_MISC_ENABLE:
 671                 data = vcpu->arch.ia32_misc_enable_msr;
 672                 break;
 673         case MSR_IA32_PERF_STATUS:
 674                 /* TSC increment by tick */
 675                 data = 1000ULL;
 676                 /* CPU multiplier */
 677                 data |= (((uint64_t)4ULL) << 40);
 678                 break;
 679         case MSR_EFER:
 680                 data = vcpu->arch.shadow_efer;
 681                 break;
 682         case MSR_KVM_WALL_CLOCK:
 683                 data = vcpu->kvm->arch.wall_clock;
 684                 break;
 685         case MSR_KVM_SYSTEM_TIME:
 686                 data = vcpu->arch.time;
 687                 break;
 688         default:
 689                 pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
 690                 return 1;
 691         }
 692         *pdata = data;
 693         return 0;
 694 }
 695 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
 696
 697 /*
 698  * Read or write a bunch of msrs. All parameters are kernel addresses.
 699  *
 700  * @return number of msrs set successfully.
 701  */
 702 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
 703                     struct kvm_msr_entry *entries,
 704                     int (*do_msr)(struct kvm_vcpu *vcpu,
 705                                   unsigned index, u64 *data))
 706 {
 707         int i;
 708
 709         vcpu_load(vcpu);
 710
 711         down_read(&vcpu->kvm->slots_lock);
 712         for (i = 0; i < msrs->nmsrs; ++i)
 713                 if (do_msr(vcpu, entries[i].index, &entries[i].data))
 714                         break;
 715         up_read(&vcpu->kvm->slots_lock);
 716
 717         vcpu_put(vcpu);
 718
 719         return i;
 720 }
 721
 722 /*
 723  * Read or write a bunch of msrs. Parameters are user addresses.
 724  *
 725  * @return number of msrs set successfully.
 726  */
 727 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
 728                   int (*do_msr)(struct kvm_vcpu *vcpu,
 729                                 unsigned index, u64 *data),
 730                   int writeback)
 731 {
 732         struct kvm_msrs msrs;
 733         struct kvm_msr_entry *entries;
 734         int r, n;
 735         unsigned size;
 736
 737         r = -EFAULT;
 738         if (copy_from_user(&msrs, user_msrs, sizeof msrs))
 739                 goto out;
 740
 741         r = -E2BIG;
 742         if (msrs.nmsrs >= MAX_IO_MSRS)
 743                 goto out;
 744
 745         r = -ENOMEM;
 746         size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
 747         entries = vmalloc(size);
 748         if (!entries)
 749                 goto out;
 750
 751         r = -EFAULT;
 752         if (copy_from_user(entries, user_msrs->entries, size))
 753                 goto out_free;
 754
 755         r = n = __msr_io(vcpu, &msrs, entries, do_msr);
 756         if (r < 0)
 757                 goto out_free;
 758
 759         r = -EFAULT;
 760         if (writeback && copy_to_user(user_msrs->entries, entries, size))
 761                 goto out_free;
 762
 763         r = n;
 764
 765 out_free:
 766         vfree(entries);
 767 out:
 768         return r;
 769 }
 770
 771 /*
 772  * Make sure that a cpu that is being hot-unplugged does not have any vcpus
 773  * cached on it.
 774  */
 775 void decache_vcpus_on_cpu(int cpu)
 776 {
 777         struct kvm *vm;
 778         struct kvm_vcpu *vcpu;
 779         int i;
 780
 781         spin_lock(&kvm_lock);
 782         list_for_each_entry(vm, &vm_list, vm_list)
 783                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 784                         vcpu = vm->vcpus[i];
 785                         if (!vcpu)
 786                                 continue;
 787                         /*
 788                          * If the vcpu is locked, then it is running on some
 789                          * other cpu and therefore it is not cached on the
 790                          * cpu in question.
 791                          *
 792                          * If it's not locked, check the last cpu it executed
 793                          * on.
 794                          */
 795                         if (mutex_trylock(&vcpu->mutex)) {
 796                                 if (vcpu->cpu == cpu) {
 797                                         kvm_x86_ops->vcpu_decache(vcpu);
 798                                         vcpu->cpu = -1;
 799                                 }
 800                                 mutex_unlock(&vcpu->mutex);
 801                         }
 802                 }
 803         spin_unlock(&kvm_lock);
 804 }
 805
 806 int kvm_dev_ioctl_check_extension(long ext)
 807 {
 808         int r;
 809
 810         switch (ext) {
 811         case KVM_CAP_IRQCHIP:
 812         case KVM_CAP_HLT:
 813         case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
 814         case KVM_CAP_USER_MEMORY:
 815         case KVM_CAP_SET_TSS_ADDR:
 816         case KVM_CAP_EXT_CPUID:
 817         case KVM_CAP_CLOCKSOURCE:
 818         case KVM_CAP_PIT:
 819         case KVM_CAP_NOP_IO_DELAY:
 820         case KVM_CAP_MP_STATE:
 821                 r = 1;
 822                 break;
 823         case KVM_CAP_VAPIC:
 824                 r = !kvm_x86_ops->cpu_has_accelerated_tpr();
 825                 break;
 826         case KVM_CAP_NR_VCPUS:
 827                 r = KVM_MAX_VCPUS;
 828                 break;
 829         case KVM_CAP_NR_MEMSLOTS:
 830                 r = KVM_MEMORY_SLOTS;
 831                 break;
 832         case KVM_CAP_PV_MMU:
 833                 r = !tdp_enabled;
 834                 break;
 835         default:
 836                 r = 0;
 837                 break;
 838         }
 839         return r;
 840
 841 }
 842
 843 long kvm_arch_dev_ioctl(struct file *filp,
 844                         unsigned int ioctl, unsigned long arg)
 845 {
 846         void __user *argp = (void __user *)arg;
 847         long r;
 848
 849         switch (ioctl) {
 850         case KVM_GET_MSR_INDEX_LIST: {
 851                 struct kvm_msr_list __user *user_msr_list = argp;
 852                 struct kvm_msr_list msr_list;
 853                 unsigned n;
 854
 855                 r = -EFAULT;
 856                 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
 857                         goto out;
 858                 n = msr_list.nmsrs;
 859                 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
 860                 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
 861                         goto out;
 862                 r = -E2BIG;
 863                 if (n < num_msrs_to_save)
 864                         goto out;
 865                 r = -EFAULT;
 866                 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
 867                                  num_msrs_to_save * sizeof(u32)))
 868                         goto out;
 869                 if (copy_to_user(user_msr_list->indices
 870                                  + num_msrs_to_save * sizeof(u32),
 871                                  &emulated_msrs,
 872                                  ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
 873                         goto out;
 874                 r = 0;
 875                 break;
 876         }
 877         case KVM_GET_SUPPORTED_CPUID: {
 878                 struct kvm_cpuid2 __user *cpuid_arg = argp;
 879                 struct kvm_cpuid2 cpuid;
 880
 881                 r = -EFAULT;
 882                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
 883                         goto out;
 884                 r = kvm_dev_ioctl_get_supported_cpuid(&cpuid,
 885                         cpuid_arg->entries);
 886                 if (r)
 887                         goto out;
 888
 889                 r = -EFAULT;
 890                 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
 891                         goto out;
 892                 r = 0;
 893                 break;
 894         }
 895         default:
 896                 r = -EINVAL;
 897         }
 898 out:
 899         return r;
 900 }
 901
 902 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 903 {
 904         kvm_x86_ops->vcpu_load(vcpu, cpu);
 905         kvm_write_guest_time(vcpu);
 906 }
 907
 908 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 909 {
 910         kvm_x86_ops->vcpu_put(vcpu);
 911         kvm_put_guest_fpu(vcpu);
 912 }
 913
 914 static int is_efer_nx(void)
 915 {
 916         u64 efer;
 917
 918         rdmsrl(MSR_EFER, efer);
 919         return efer & EFER_NX;
 920 }
 921
 922 static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
 923 {
 924         int i;
 925         struct kvm_cpuid_entry2 *e, *entry;
 926
 927         entry = NULL;
 928         for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
 929                 e = &vcpu->arch.cpuid_entries[i];
 930                 if (e->function == 0x80000001) {
 931                         entry = e;
 932                         break;
 933                 }
 934         }
 935         if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) {
 936                 entry->edx &= ~(1 << 20);
 937                 printk(KERN_INFO "kvm: guest NX capability removed\n");
 938         }
 939 }
 940
 941 /* when an old userspace process fills a new kernel module */
 942 static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
 943                                     struct kvm_cpuid *cpuid,
 944                                     struct kvm_cpuid_entry __user *entries)
 945 {
 946         int r, i;
 947         struct kvm_cpuid_entry *cpuid_entries;
 948
 949         r = -E2BIG;
 950         if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
 951                 goto out;
 952         r = -ENOMEM;
 953         cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent);
 954         if (!cpuid_entries)
 955                 goto out;
 956         r = -EFAULT;
 957         if (copy_from_user(cpuid_entries, entries,
 958                            cpuid->nent * sizeof(struct kvm_cpuid_entry)))
 959                 goto out_free;
 960         for (i = 0; i < cpuid->nent; i++) {
 961                 vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function;
 962                 vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax;
 963                 vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx;
 964                 vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx;
 965                 vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx;
 966                 vcpu->arch.cpuid_entries[i].index = 0;
 967                 vcpu->arch.cpuid_entries[i].flags = 0;
 968                 vcpu->arch.cpuid_entries[i].padding[0] = 0;
 969                 vcpu->arch.cpuid_entries[i].padding[1] = 0;
 970                 vcpu->arch.cpuid_entries[i].padding[2] = 0;
 971         }
 972         vcpu->arch.cpuid_nent = cpuid->nent;
 973         cpuid_fix_nx_cap(vcpu);
 974         r = 0;
 975
 976 out_free:
 977         vfree(cpuid_entries);
 978 out:
 979         return r;
 980 }
 981
 982 static int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
 983                                     struct kvm_cpuid2 *cpuid,
 984                                     struct kvm_cpuid_entry2 __user *entries)
 985 {
 986         int r;
 987
 988         r = -E2BIG;
 989         if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
 990                 goto out;
 991         r = -EFAULT;
 992         if (copy_from_user(&vcpu->arch.cpuid_entries, entries,
 993                            cpuid->nent * sizeof(struct kvm_cpuid_entry2)))
 994                 goto out;
 995         vcpu->arch.cpuid_nent = cpuid->nent;
 996         return 0;
 997
 998 out:
 999         return r;
1000 }
1001
1002 static int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
1003                                     struct kvm_cpuid2 *cpuid,
1004                                     struct kvm_cpuid_entry2 __user *entries)
1005 {
1006         int r;
1007
1008         r = -E2BIG;
1009         if (cpuid->nent < vcpu->arch.cpuid_nent)
1010                 goto out;
1011         r = -EFAULT;
1012         if (copy_to_user(entries, &vcpu->arch.cpuid_entries,
1013                            vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2)))
1014                 goto out;
1015         return 0;
1016
1017 out:
1018         cpuid->nent = vcpu->arch.cpuid_nent;
1019         return r;
1020 }
1021
1022 static inline u32 bit(int bitno)
1023 {
1024         return 1 << (bitno & 31);
1025 }
1026
1027 static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function,
1028                           u32 index)
1029 {
1030         entry->function = function;
1031         entry->index = index;
1032         cpuid_count(entry->function, entry->index,
1033                 &entry->eax, &entry->ebx, &entry->ecx, &entry->edx);
1034         entry->flags = 0;
1035 }
1036
1037 static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
1038                          u32 index, int *nent, int maxnent)
1039 {
1040         const u32 kvm_supported_word0_x86_features = bit(X86_FEATURE_FPU) |
1041                 bit(X86_FEATURE_VME) | bit(X86_FEATURE_DE) |
1042                 bit(X86_FEATURE_PSE) | bit(X86_FEATURE_TSC) |
1043                 bit(X86_FEATURE_MSR) | bit(X86_FEATURE_PAE) |
1044                 bit(X86_FEATURE_CX8) | bit(X86_FEATURE_APIC) |
1045                 bit(X86_FEATURE_SEP) | bit(X86_FEATURE_PGE) |
1046                 bit(X86_FEATURE_CMOV) | bit(X86_FEATURE_PSE36) |
1047                 bit(X86_FEATURE_CLFLSH) | bit(X86_FEATURE_MMX) |
1048                 bit(X86_FEATURE_FXSR) | bit(X86_FEATURE_XMM) |
1049                 bit(X86_FEATURE_XMM2) | bit(X86_FEATURE_SELFSNOOP);
1050         const u32 kvm_supported_word1_x86_features = bit(X86_FEATURE_FPU) |
1051                 bit(X86_FEATURE_VME) | bit(X86_FEATURE_DE) |
1052                 bit(X86_FEATURE_PSE) | bit(X86_FEATURE_TSC) |
1053                 bit(X86_FEATURE_MSR) | bit(X86_FEATURE_PAE) |
1054                 bit(X86_FEATURE_CX8) | bit(X86_FEATURE_APIC) |
1055                 bit(X86_FEATURE_PGE) |
1056                 bit(X86_FEATURE_CMOV) | bit(X86_FEATURE_PSE36) |
1057                 bit(X86_FEATURE_MMX) | bit(X86_FEATURE_FXSR) |
1058                 bit(X86_FEATURE_SYSCALL) |
1059                 (bit(X86_FEATURE_NX) && is_efer_nx()) |
1060 #ifdef CONFIG_X86_64
1061                 bit(X86_FEATURE_LM) |
1062 #endif
1063                 bit(X86_FEATURE_MMXEXT) |
1064                 bit(X86_FEATURE_3DNOWEXT) |
1065                 bit(X86_FEATURE_3DNOW);
1066         const u32 kvm_supported_word3_x86_features =
1067                 bit(X86_FEATURE_XMM3) | bit(X86_FEATURE_CX16);
1068         const u32 kvm_supported_word6_x86_features =
1069                 bit(X86_FEATURE_LAHF_LM) | bit(X86_FEATURE_CMP_LEGACY);
1070
1071         /* all func 2 cpuid_count() should be called on the same cpu */
1072         get_cpu();
1073         do_cpuid_1_ent(entry, function, index);
1074         ++*nent;
1075
1076         switch (function) {
1077         case 0:
1078                 entry->eax = min(entry->eax, (u32)0xb);
1079                 break;
1080         case 1:
1081                 entry->edx &= kvm_supported_word0_x86_features;
1082                 entry->ecx &= kvm_supported_word3_x86_features;
1083                 break;
1084         /* function 2 entries are STATEFUL. That is, repeated cpuid commands
1085          * may return different values. This forces us to get_cpu() before
1086          * issuing the first command, and also to emulate this annoying behavior
1087          * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */
1088         case 2: {
1089                 int t, times = entry->eax & 0xff;
1090
1091                 entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
1092                 for (t = 1; t < times && *nent < maxnent; ++t) {
1093                         do_cpuid_1_ent(&entry[t], function, 0);
1094                         entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
1095                         ++*nent;
1096                 }
1097                 break;
1098         }
1099         /* function 4 and 0xb have additional index. */
1100         case 4: {
1101                 int i, cache_type;
1102
1103                 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1104                 /* read more entries until cache_type is zero */
1105                 for (i = 1; *nent < maxnent; ++i) {
1106                         cache_type = entry[i - 1].eax & 0x1f;
1107                         if (!cache_type)
1108                                 break;
1109                         do_cpuid_1_ent(&entry[i], function, i);
1110                         entry[i].flags |=
1111                                KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1112                         ++*nent;
1113                 }
1114                 break;
1115         }
1116         case 0xb: {
1117                 int i, level_type;
1118
1119                 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1120                 /* read more entries until level_type is zero */
1121                 for (i = 1; *nent < maxnent; ++i) {
1122                         level_type = entry[i - 1].ecx & 0xff;
1123                         if (!level_type)
1124                                 break;
1125                         do_cpuid_1_ent(&entry[i], function, i);
1126                         entry[i].flags |=
1127                                KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1128                         ++*nent;
1129                 }
1130                 break;
1131         }
1132         case 0x80000000:
1133                 entry->eax = min(entry->eax, 0x8000001a);
1134                 break;
1135         case 0x80000001:
1136                 entry->edx &= kvm_supported_word1_x86_features;
1137                 entry->ecx &= kvm_supported_word6_x86_features;
1138                 break;
1139         }
1140         put_cpu();
1141 }
1142
1143 static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
1144                                     struct kvm_cpuid_entry2 __user *entries)
1145 {
1146         struct kvm_cpuid_entry2 *cpuid_entries;
1147         int limit, nent = 0, r = -E2BIG;
1148         u32 func;
1149
1150         if (cpuid->nent < 1)
1151                 goto out;
1152         r = -ENOMEM;
1153         cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent);
1154         if (!cpuid_entries)
1155                 goto out;
1156
1157         do_cpuid_ent(&cpuid_entries[0], 0, 0, &nent, cpuid->nent);
1158         limit = cpuid_entries[0].eax;
1159         for (func = 1; func <= limit && nent < cpuid->nent; ++func)
1160                 do_cpuid_ent(&cpuid_entries[nent], func, 0,
1161                                 &nent, cpuid->nent);
1162         r = -E2BIG;
1163         if (nent >= cpuid->nent)
1164                 goto out_free;
1165
1166         do_cpuid_ent(&cpuid_entries[nent], 0x80000000, 0, &nent, cpuid->nent);
1167         limit = cpuid_entries[nent - 1].eax;
1168         for (func = 0x80000001; func <= limit && nent < cpuid->nent; ++func)
1169                 do_cpuid_ent(&cpuid_entries[nent], func, 0,
1170                                &nent, cpuid->nent);
1171         r = -EFAULT;
1172         if (copy_to_user(entries, cpuid_entries,
1173                         nent * sizeof(struct kvm_cpuid_entry2)))
1174                 goto out_free;
1175         cpuid->nent = nent;
1176         r = 0;
1177
1178 out_free:
1179         vfree(cpuid_entries);
1180 out:
1181         return r;
1182 }
1183
1184 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
1185                                     struct kvm_lapic_state *s)
1186 {
1187         vcpu_load(vcpu);
1188         memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s);
1189         vcpu_put(vcpu);
1190
1191         return 0;
1192 }
1193
1194 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
1195                                     struct kvm_lapic_state *s)
1196 {
1197         vcpu_load(vcpu);
1198         memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
1199         kvm_apic_post_state_restore(vcpu);
1200         vcpu_put(vcpu);
1201
1202         return 0;
1203 }
1204
1205 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
1206                                     struct kvm_interrupt *irq)
1207 {
1208         if (irq->irq < 0 || irq->irq >= 256)
1209                 return -EINVAL;
1210         if (irqchip_in_kernel(vcpu->kvm))
1211                 return -ENXIO;
1212         vcpu_load(vcpu);
1213
1214         set_bit(irq->irq, vcpu->arch.irq_pending);
1215         set_bit(irq->irq / BITS_PER_LONG, &vcpu->arch.irq_summary);
1216
1217         vcpu_put(vcpu);
1218
1219         return 0;
1220 }
1221
1222 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
1223                                            struct kvm_tpr_access_ctl *tac)
1224 {
1225         if (tac->flags)
1226                 return -EINVAL;
1227         vcpu->arch.tpr_access_reporting = !!tac->enabled;
1228         return 0;
1229 }
1230
1231 long kvm_arch_vcpu_ioctl(struct file *filp,
1232                          unsigned int ioctl, unsigned long arg)
1233 {
1234         struct kvm_vcpu *vcpu = filp->private_data;
1235         void __user *argp = (void __user *)arg;
1236         int r;
1237
1238         switch (ioctl) {
1239         case KVM_GET_LAPIC: {
1240                 struct kvm_lapic_state lapic;
1241
1242                 memset(&lapic, 0, sizeof lapic);
1243                 r = kvm_vcpu_ioctl_get_lapic(vcpu, &lapic);
1244                 if (r)
1245                         goto out;
1246                 r = -EFAULT;
1247                 if (copy_to_user(argp, &lapic, sizeof lapic))
1248                         goto out;
1249                 r = 0;
1250                 break;
1251         }
1252         case KVM_SET_LAPIC: {
1253                 struct kvm_lapic_state lapic;
1254
1255                 r = -EFAULT;
1256                 if (copy_from_user(&lapic, argp, sizeof lapic))
1257                         goto out;
1258                 r = kvm_vcpu_ioctl_set_lapic(vcpu, &lapic);;
1259                 if (r)
1260                         goto out;
1261                 r = 0;
1262                 break;
1263         }
1264         case KVM_INTERRUPT: {
1265                 struct kvm_interrupt irq;
1266
1267                 r = -EFAULT;
1268                 if (copy_from_user(&irq, argp, sizeof irq))
1269                         goto out;
1270                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
1271                 if (r)
1272                         goto out;
1273                 r = 0;
1274                 break;
1275         }
1276         case KVM_SET_CPUID: {
1277                 struct kvm_cpuid __user *cpuid_arg = argp;
1278                 struct kvm_cpuid cpuid;
1279
1280                 r = -EFAULT;
1281                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1282                         goto out;
1283                 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
1284                 if (r)
1285                         goto out;
1286                 break;
1287         }
1288         case KVM_SET_CPUID2: {
1289                 struct kvm_cpuid2 __user *cpuid_arg = argp;
1290                 struct kvm_cpuid2 cpuid;
1291
1292                 r = -EFAULT;
1293                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1294                         goto out;
1295                 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
1296                                 cpuid_arg->entries);
1297                 if (r)
1298                         goto out;
1299                 break;
1300         }
1301         case KVM_GET_CPUID2: {
1302                 struct kvm_cpuid2 __user *cpuid_arg = argp;
1303                 struct kvm_cpuid2 cpuid;
1304
1305                 r = -EFAULT;
1306                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1307                         goto out;
1308                 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
1309                                 cpuid_arg->entries);
1310                 if (r)
1311                         goto out;
1312                 r = -EFAULT;
1313                 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
1314                         goto out;
1315                 r = 0;
1316                 break;
1317         }
1318         case KVM_GET_MSRS:
1319                 r = msr_io(vcpu, argp, kvm_get_msr, 1);
1320                 break;
1321         case KVM_SET_MSRS:
1322                 r = msr_io(vcpu, argp, do_set_msr, 0);
1323                 break;
1324         case KVM_TPR_ACCESS_REPORTING: {
1325                 struct kvm_tpr_access_ctl tac;
1326
1327                 r = -EFAULT;
1328                 if (copy_from_user(&tac, argp, sizeof tac))
1329                         goto out;
1330                 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac);
1331                 if (r)
1332                         goto out;
1333                 r = -EFAULT;
1334                 if (copy_to_user(argp, &tac, sizeof tac))
1335                         goto out;
1336                 r = 0;
1337                 break;
1338         };
1339         case KVM_SET_VAPIC_ADDR: {
1340                 struct kvm_vapic_addr va;
1341
1342                 r = -EINVAL;
1343                 if (!irqchip_in_kernel(vcpu->kvm))
1344                         goto out;
1345                 r = -EFAULT;
1346                 if (copy_from_user(&va, argp, sizeof va))
1347                         goto out;
1348                 r = 0;
1349                 kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr);
1350                 break;
1351         }
1352         default:
1353                 r = -EINVAL;
1354         }
1355 out:
1356         return r;
1357 }
1358
1359 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
1360 {
1361         int ret;
1362
1363         if (addr > (unsigned int)(-3 * PAGE_SIZE))
1364                 return -1;
1365         ret = kvm_x86_ops->set_tss_addr(kvm, addr);
1366         return ret;
1367 }
1368
1369 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
1370                                           u32 kvm_nr_mmu_pages)
1371 {
1372         if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
1373                 return -EINVAL;
1374
1375         down_write(&kvm->slots_lock);
1376
1377         kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
1378         kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
1379
1380         up_write(&kvm->slots_lock);
1381         return 0;
1382 }
1383
1384 static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
1385 {
1386         return kvm->arch.n_alloc_mmu_pages;
1387 }
1388
1389 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
1390 {
1391         int i;
1392         struct kvm_mem_alias *alias;
1393
1394         for (i = 0; i < kvm->arch.naliases; ++i) {
1395                 alias = &kvm->arch.aliases[i];
1396                 if (gfn >= alias->base_gfn
1397                     && gfn < alias->base_gfn + alias->npages)
1398                         return alias->target_gfn + gfn - alias->base_gfn;
1399         }
1400         return gfn;
1401 }
1402
1403 /*
1404  * Set a new alias region.  Aliases map a portion of physical memory into
1405  * another portion.  This is useful for memory windows, for example the PC
1406  * VGA region.
1407  */
1408 static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
1409                                          struct kvm_memory_alias *alias)
1410 {
1411         int r, n;
1412         struct kvm_mem_alias *p;
1413
1414         r = -EINVAL;
1415         /* General sanity checks */
1416         if (alias->memory_size & (PAGE_SIZE - 1))
1417                 goto out;
1418         if (alias->guest_phys_addr & (PAGE_SIZE - 1))
1419                 goto out;
1420         if (alias->slot >= KVM_ALIAS_SLOTS)
1421                 goto out;
1422         if (alias->guest_phys_addr + alias->memory_size
1423             < alias->guest_phys_addr)
1424                 goto out;
1425         if (alias->target_phys_addr + alias->memory_size
1426             < alias->target_phys_addr)
1427                 goto out;
1428
1429         down_write(&kvm->slots_lock);
1430
1431         p = &kvm->arch.aliases[alias->slot];
1432         p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
1433         p->npages = alias->memory_size >> PAGE_SHIFT;
1434         p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
1435
1436         for (n = KVM_ALIAS_SLOTS; n > 0; --n)
1437                 if (kvm->arch.aliases[n - 1].npages)
1438                         break;
1439         kvm->arch.naliases = n;
1440
1441         kvm_mmu_zap_all(kvm);
1442
1443         up_write(&kvm->slots_lock);
1444
1445         return 0;
1446
1447 out:
1448         return r;
1449 }
1450
1451 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
1452 {
1453         int r;
1454
1455         r = 0;
1456         switch (chip->chip_id) {
1457         case KVM_IRQCHIP_PIC_MASTER:
1458                 memcpy(&chip->chip.pic,
1459                         &pic_irqchip(kvm)->pics[0],
1460                         sizeof(struct kvm_pic_state));
1461                 break;
1462         case KVM_IRQCHIP_PIC_SLAVE:
1463                 memcpy(&chip->chip.pic,
1464                         &pic_irqchip(kvm)->pics[1],
1465                         sizeof(struct kvm_pic_state));
1466                 break;
1467         case KVM_IRQCHIP_IOAPIC:
1468                 memcpy(&chip->chip.ioapic,
1469                         ioapic_irqchip(kvm),
1470                         sizeof(struct kvm_ioapic_state));
1471                 break;
1472         default:
1473                 r = -EINVAL;
1474                 break;
1475         }
1476         return r;
1477 }
1478
1479 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
1480 {
1481         int r;
1482
1483         r = 0;
1484         switch (chip->chip_id) {
1485         case KVM_IRQCHIP_PIC_MASTER:
1486                 memcpy(&pic_irqchip(kvm)->pics[0],
1487                         &chip->chip.pic,
1488                         sizeof(struct kvm_pic_state));
1489                 break;
1490         case KVM_IRQCHIP_PIC_SLAVE:
1491                 memcpy(&pic_irqchip(kvm)->pics[1],
1492                         &chip->chip.pic,
1493                         sizeof(struct kvm_pic_state));
1494                 break;
1495         case KVM_IRQCHIP_IOAPIC:
1496                 memcpy(ioapic_irqchip(kvm),
1497                         &chip->chip.ioapic,
1498                         sizeof(struct kvm_ioapic_state));
1499                 break;
1500         default:
1501                 r = -EINVAL;
1502                 break;
1503         }
1504         kvm_pic_update_irq(pic_irqchip(kvm));
1505         return r;
1506 }
1507
1508 static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps)
1509 {
1510         int r = 0;
1511
1512         memcpy(ps, &kvm->arch.vpit->pit_state, sizeof(struct kvm_pit_state));
1513         return r;
1514 }
1515
1516 static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
1517 {
1518         int r = 0;
1519
1520         memcpy(&kvm->arch.vpit->pit_state, ps, sizeof(struct kvm_pit_state));
1521         kvm_pit_load_count(kvm, 0, ps->channels[0].count);
1522         return r;
1523 }
1524
1525 /*
1526  * Get (and clear) the dirty memory log for a memory slot.
1527  */
1528 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
1529                                       struct kvm_dirty_log *log)
1530 {
1531         int r;
1532         int n;
1533         struct kvm_memory_slot *memslot;
1534         int is_dirty = 0;
1535
1536         down_write(&kvm->slots_lock);
1537
1538         r = kvm_get_dirty_log(kvm, log, &is_dirty);
1539         if (r)
1540                 goto out;
1541
1542         /* If nothing is dirty, don't bother messing with page tables. */
1543         if (is_dirty) {
1544                 kvm_mmu_slot_remove_write_access(kvm, log->slot);
1545                 kvm_flush_remote_tlbs(kvm);
1546                 memslot = &kvm->memslots[log->slot];
1547                 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
1548                 memset(memslot->dirty_bitmap, 0, n);
1549         }
1550         r = 0;
1551 out:
1552         up_write(&kvm->slots_lock);
1553         return r;
1554 }
1555
1556 long kvm_arch_vm_ioctl(struct file *filp,
1557                        unsigned int ioctl, unsigned long arg)
1558 {
1559         struct kvm *kvm = filp->private_data;
1560         void __user *argp = (void __user *)arg;
1561         int r = -EINVAL;
1562
1563         switch (ioctl) {
1564         case KVM_SET_TSS_ADDR:
1565                 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
1566                 if (r < 0)
1567                         goto out;
1568                 break;
1569         case KVM_SET_MEMORY_REGION: {
1570                 struct kvm_memory_region kvm_mem;
1571                 struct kvm_userspace_memory_region kvm_userspace_mem;
1572
1573                 r = -EFAULT;
1574                 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
1575                         goto out;
1576                 kvm_userspace_mem.slot = kvm_mem.slot;
1577                 kvm_userspace_mem.flags = kvm_mem.flags;
1578                 kvm_userspace_mem.guest_phys_addr = kvm_mem.guest_phys_addr;
1579                 kvm_userspace_mem.memory_size = kvm_mem.memory_size;
1580                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 0);
1581                 if (r)
1582                         goto out;
1583                 break;
1584         }
1585         case KVM_SET_NR_MMU_PAGES:
1586                 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
1587                 if (r)
1588                         goto out;
1589                 break;
1590         case KVM_GET_NR_MMU_PAGES:
1591                 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
1592                 break;
1593         case KVM_SET_MEMORY_ALIAS: {
1594                 struct kvm_memory_alias alias;
1595
1596                 r = -EFAULT;
1597                 if (copy_from_user(&alias, argp, sizeof alias))
1598                         goto out;
1599                 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
1600                 if (r)
1601                         goto out;
1602                 break;
1603         }
1604         case KVM_CREATE_IRQCHIP:
1605                 r = -ENOMEM;
1606                 kvm->arch.vpic = kvm_create_pic(kvm);
1607                 if (kvm->arch.vpic) {
1608                         r = kvm_ioapic_init(kvm);
1609                         if (r) {
1610                                 kfree(kvm->arch.vpic);
1611                                 kvm->arch.vpic = NULL;
1612                                 goto out;
1613                         }
1614                 } else
1615                         goto out;
1616                 break;
1617         case KVM_CREATE_PIT:
1618                 r = -ENOMEM;
1619                 kvm->arch.vpit = kvm_create_pit(kvm);
1620                 if (kvm->arch.vpit)
1621                         r = 0;
1622                 break;
1623         case KVM_IRQ_LINE: {
1624                 struct kvm_irq_level irq_event;
1625
1626                 r = -EFAULT;
1627                 if (copy_from_user(&irq_event, argp, sizeof irq_event))
1628                         goto out;
1629                 if (irqchip_in_kernel(kvm)) {
1630                         mutex_lock(&kvm->lock);
1631                         if (irq_event.irq < 16)
1632                                 kvm_pic_set_irq(pic_irqchip(kvm),
1633                                         irq_event.irq,
1634                                         irq_event.level);
1635                         kvm_ioapic_set_irq(kvm->arch.vioapic,
1636                                         irq_event.irq,
1637                                         irq_event.level);
1638                         mutex_unlock(&kvm->lock);
1639                         r = 0;
1640                 }
1641                 break;
1642         }
1643         case KVM_GET_IRQCHIP: {
1644                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
1645                 struct kvm_irqchip chip;
1646
1647                 r = -EFAULT;
1648                 if (copy_from_user(&chip, argp, sizeof chip))
1649                         goto out;
1650                 r = -ENXIO;
1651                 if (!irqchip_in_kernel(kvm))
1652                         goto out;
1653                 r = kvm_vm_ioctl_get_irqchip(kvm, &chip);
1654                 if (r)
1655                         goto out;
1656                 r = -EFAULT;
1657                 if (copy_to_user(argp, &chip, sizeof chip))
1658                         goto out;
1659                 r = 0;
1660                 break;
1661         }
1662         case KVM_SET_IRQCHIP: {
1663                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
1664                 struct kvm_irqchip chip;
1665
1666                 r = -EFAULT;
1667                 if (copy_from_user(&chip, argp, sizeof chip))
1668                         goto out;
1669                 r = -ENXIO;
1670                 if (!irqchip_in_kernel(kvm))
1671                         goto out;
1672                 r = kvm_vm_ioctl_set_irqchip(kvm, &chip);
1673                 if (r)
1674                         goto out;
1675                 r = 0;
1676                 break;
1677         }
1678         case KVM_GET_PIT: {
1679                 struct kvm_pit_state ps;
1680                 r = -EFAULT;
1681                 if (copy_from_user(&ps, argp, sizeof ps))
1682                         goto out;
1683                 r = -ENXIO;
1684                 if (!kvm->arch.vpit)
1685                         goto out;
1686                 r = kvm_vm_ioctl_get_pit(kvm, &ps);
1687                 if (r)
1688                         goto out;
1689                 r = -EFAULT;
1690                 if (copy_to_user(argp, &ps, sizeof ps))
1691                         goto out;
1692                 r = 0;
1693                 break;
1694         }
1695         case KVM_SET_PIT: {
1696                 struct kvm_pit_state ps;
1697                 r = -EFAULT;
1698                 if (copy_from_user(&ps, argp, sizeof ps))
1699                         goto out;
1700                 r = -ENXIO;
1701                 if (!kvm->arch.vpit)
1702                         goto out;
1703                 r = kvm_vm_ioctl_set_pit(kvm, &ps);
1704                 if (r)
1705                         goto out;
1706                 r = 0;
1707                 break;
1708         }
1709         default:
1710                 ;
1711         }
1712 out:
1713         return r;
1714 }
1715
1716 static void kvm_init_msr_list(void)
1717 {
1718         u32 dummy[2];
1719         unsigned i, j;
1720
1721         for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1722                 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1723                         continue;
1724                 if (j < i)
1725                         msrs_to_save[j] = msrs_to_save[i];
1726                 j++;
1727         }
1728         num_msrs_to_save = j;
1729 }
1730
1731 /*
1732  * Only apic need an MMIO device hook, so shortcut now..
1733  */
1734 static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
1735                                                 gpa_t addr)
1736 {
1737         struct kvm_io_device *dev;
1738
1739         if (vcpu->arch.apic) {
1740                 dev = &vcpu->arch.apic->dev;
1741                 if (dev->in_range(dev, addr))
1742                         return dev;
1743         }
1744         return NULL;
1745 }
1746
1747
1748 static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
1749                                                 gpa_t addr)
1750 {
1751         struct kvm_io_device *dev;
1752
1753         dev = vcpu_find_pervcpu_dev(vcpu, addr);
1754         if (dev == NULL)
1755                 dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
1756         return dev;
1757 }
1758
1759 int emulator_read_std(unsigned long addr,
1760                              void *val,
1761                              unsigned int bytes,
1762                              struct kvm_vcpu *vcpu)
1763 {
1764         void *data = val;
1765         int r = X86EMUL_CONTINUE;
1766
1767         while (bytes) {
1768                 gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
1769                 unsigned offset = addr & (PAGE_SIZE-1);
1770                 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
1771                 int ret;
1772
1773                 if (gpa == UNMAPPED_GVA) {
1774                         r = X86EMUL_PROPAGATE_FAULT;
1775                         goto out;
1776                 }
1777                 ret = kvm_read_guest(vcpu->kvm, gpa, data, tocopy);
1778                 if (ret < 0) {
1779                         r = X86EMUL_UNHANDLEABLE;
1780                         goto out;
1781                 }
1782
1783                 bytes -= tocopy;
1784                 data += tocopy;
1785                 addr += tocopy;
1786         }
1787 out:
1788         return r;
1789 }
1790 EXPORT_SYMBOL_GPL(emulator_read_std);
1791
1792 static int emulator_read_emulated(unsigned long addr,
1793                                   void *val,
1794                                   unsigned int bytes,
1795                                   struct kvm_vcpu *vcpu)
1796 {
1797         struct kvm_io_device *mmio_dev;
1798         gpa_t                 gpa;
1799
1800         if (vcpu->mmio_read_completed) {
1801                 memcpy(val, vcpu->mmio_data, bytes);
1802                 vcpu->mmio_read_completed = 0;
1803                 return X86EMUL_CONTINUE;
1804         }
1805
1806         gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
1807
1808         /* For APIC access vmexit */
1809         if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
1810                 goto mmio;
1811
1812         if (emulator_read_std(addr, val, bytes, vcpu)
1813                         == X86EMUL_CONTINUE)
1814                 return X86EMUL_CONTINUE;
1815         if (gpa == UNMAPPED_GVA)
1816                 return X86EMUL_PROPAGATE_FAULT;
1817
1818 mmio:
1819         /*
1820          * Is this MMIO handled locally?
1821          */
1822         mutex_lock(&vcpu->kvm->lock);
1823         mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1824         if (mmio_dev) {
1825                 kvm_iodevice_read(mmio_dev, gpa, bytes, val);
1826                 mutex_unlock(&vcpu->kvm->lock);
1827                 return X86EMUL_CONTINUE;
1828         }
1829         mutex_unlock(&vcpu->kvm->lock);
1830
1831         vcpu->mmio_needed = 1;
1832         vcpu->mmio_phys_addr = gpa;
1833         vcpu->mmio_size = bytes;
1834         vcpu->mmio_is_write = 0;
1835
1836         return X86EMUL_UNHANDLEABLE;
1837 }
1838
1839 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
1840                           const void *val, int bytes)
1841 {
1842         int ret;
1843
1844         ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
1845         if (ret < 0)
1846                 return 0;
1847         kvm_mmu_pte_write(vcpu, gpa, val, bytes);
1848         return 1;
1849 }
1850
1851 static int emulator_write_emulated_onepage(unsigned long addr,
1852                                            const void *val,
1853                                            unsigned int bytes,
1854                                            struct kvm_vcpu *vcpu)
1855 {
1856         struct kvm_io_device *mmio_dev;
1857         gpa_t                 gpa;
1858
1859         gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
1860
1861         if (gpa == UNMAPPED_GVA) {
1862                 kvm_inject_page_fault(vcpu, addr, 2);
1863                 return X86EMUL_PROPAGATE_FAULT;
1864         }
1865
1866         /* For APIC access vmexit */
1867         if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
1868                 goto mmio;
1869
1870         if (emulator_write_phys(vcpu, gpa, val, bytes))
1871                 return X86EMUL_CONTINUE;
1872
1873 mmio:
1874         /*
1875          * Is this MMIO handled locally?
1876          */
1877         mutex_lock(&vcpu->kvm->lock);
1878         mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1879         if (mmio_dev) {
1880                 kvm_iodevice_write(mmio_dev, gpa, bytes, val);
1881                 mutex_unlock(&vcpu->kvm->lock);
1882                 return X86EMUL_CONTINUE;
1883         }
1884         mutex_unlock(&vcpu->kvm->lock);
1885
1886         vcpu->mmio_needed = 1;
1887         vcpu->mmio_phys_addr = gpa;
1888         vcpu->mmio_size = bytes;
1889         vcpu->mmio_is_write = 1;
1890         memcpy(vcpu->mmio_data, val, bytes);
1891
1892         return X86EMUL_CONTINUE;
1893 }
1894
1895 int emulator_write_emulated(unsigned long addr,
1896                                    const void *val,
1897                                    unsigned int bytes,
1898                                    struct kvm_vcpu *vcpu)
1899 {
1900         /* Crossing a page boundary? */
1901         if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
1902                 int rc, now;
1903
1904                 now = -addr & ~PAGE_MASK;
1905                 rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
1906                 if (rc != X86EMUL_CONTINUE)
1907                         return rc;
1908                 addr += now;
1909                 val += now;
1910                 bytes -= now;
1911         }
1912         return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
1913 }
1914 EXPORT_SYMBOL_GPL(emulator_write_emulated);
1915
1916 static int emulator_cmpxchg_emulated(unsigned long addr,
1917                                      const void *old,
1918                                      const void *new,
1919                                      unsigned int bytes,
1920                                      struct kvm_vcpu *vcpu)
1921 {
1922         static int reported;
1923
1924         if (!reported) {
1925                 reported = 1;
1926                 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1927         }
1928 #ifndef CONFIG_X86_64
1929         /* guests cmpxchg8b have to be emulated atomically */
1930         if (bytes == 8) {
1931                 gpa_t gpa;
1932                 struct page *page;
1933                 char *kaddr;
1934                 u64 val;
1935
1936                 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
1937
1938                 if (gpa == UNMAPPED_GVA ||
1939                    (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
1940                         goto emul_write;
1941
1942                 if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK))
1943                         goto emul_write;
1944
1945                 val = *(u64 *)new;
1946
1947                 down_read(&current->mm->mmap_sem);
1948                 page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
1949                 up_read(&current->mm->mmap_sem);
1950
1951                 kaddr = kmap_atomic(page, KM_USER0);
1952                 set_64bit((u64 *)(kaddr + offset_in_page(gpa)), val);
1953                 kunmap_atomic(kaddr, KM_USER0);
1954                 kvm_release_page_dirty(page);
1955         }
1956 emul_write:
1957 #endif
1958
1959         return emulator_write_emulated(addr, new, bytes, vcpu);
1960 }
1961
1962 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1963 {
1964         return kvm_x86_ops->get_segment_base(vcpu, seg);
1965 }
1966
1967 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1968 {
1969         return X86EMUL_CONTINUE;
1970 }
1971
1972 int emulate_clts(struct kvm_vcpu *vcpu)
1973 {
1974         kvm_x86_ops->set_cr0(vcpu, vcpu->arch.cr0 & ~X86_CR0_TS);
1975         return X86EMUL_CONTINUE;
1976 }
1977
1978 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
1979 {
1980         struct kvm_vcpu *vcpu = ctxt->vcpu;
1981
1982         switch (dr) {
1983         case 0 ... 3:
1984                 *dest = kvm_x86_ops->get_dr(vcpu, dr);
1985                 return X86EMUL_CONTINUE;
1986         default:
1987                 pr_unimpl(vcpu, "%s: unexpected dr %u\n", __func__, dr);
1988                 return X86EMUL_UNHANDLEABLE;
1989         }
1990 }
1991
1992 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1993 {
1994         unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1995         int exception;
1996
1997         kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1998         if (exception) {
1999                 /* FIXME: better handling */
2000                 return X86EMUL_UNHANDLEABLE;
2001         }
2002         return X86EMUL_CONTINUE;
2003 }
2004
2005 void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
2006 {
2007         static int reported;
2008         u8 opcodes[4];
2009         unsigned long rip = vcpu->arch.rip;
2010         unsigned long rip_linear;
2011
2012         rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS);
2013
2014         if (reported)
2015                 return;
2016
2017         emulator_read_std(rip_linear, (void *)opcodes, 4, vcpu);
2018
2019         printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n",
2020                context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
2021         reported = 1;
2022 }
2023 EXPORT_SYMBOL_GPL(kvm_report_emulation_failure);
2024
2025 static struct x86_emulate_ops emulate_ops = {
2026         .read_std            = emulator_read_std,
2027         .read_emulated       = emulator_read_emulated,
2028         .write_emulated      = emulator_write_emulated,
2029         .cmpxchg_emulated    = emulator_cmpxchg_emulated,
2030 };
2031
2032 int emulate_instruction(struct kvm_vcpu *vcpu,
2033                         struct kvm_run *run,
2034                         unsigned long cr2,
2035                         u16 error_code,
2036                         int emulation_type)
2037 {
2038         int r;
2039         struct decode_cache *c;
2040
2041         vcpu->arch.mmio_fault_cr2 = cr2;
2042         kvm_x86_ops->cache_regs(vcpu);
2043
2044         vcpu->mmio_is_write = 0;
2045         vcpu->arch.pio.string = 0;
2046
2047         if (!(emulation_type & EMULTYPE_NO_DECODE)) {
2048                 int cs_db, cs_l;
2049                 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
2050
2051                 vcpu->arch.emulate_ctxt.vcpu = vcpu;
2052                 vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
2053                 vcpu->arch.emulate_ctxt.mode =
2054                         (vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)
2055                         ? X86EMUL_MODE_REAL : cs_l
2056                         ? X86EMUL_MODE_PROT64 : cs_db
2057                         ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
2058
2059                 if (vcpu->arch.emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
2060                         vcpu->arch.emulate_ctxt.cs_base = 0;
2061                         vcpu->arch.emulate_ctxt.ds_base = 0;
2062                         vcpu->arch.emulate_ctxt.es_base = 0;
2063                         vcpu->arch.emulate_ctxt.ss_base = 0;
2064                 } else {
2065                         vcpu->arch.emulate_ctxt.cs_base =
2066                                         get_segment_base(vcpu, VCPU_SREG_CS);
2067                         vcpu->arch.emulate_ctxt.ds_base =
2068                                         get_segment_base(vcpu, VCPU_SREG_DS);
2069                         vcpu->arch.emulate_ctxt.es_base =
2070                                         get_segment_base(vcpu, VCPU_SREG_ES);
2071                         vcpu->arch.emulate_ctxt.ss_base =
2072                                         get_segment_base(vcpu, VCPU_SREG_SS);
2073                 }
2074
2075                 vcpu->arch.emulate_ctxt.gs_base =
2076                                         get_segment_base(vcpu, VCPU_SREG_GS);
2077                 vcpu->arch.emulate_ctxt.fs_base =
2078                                         get_segment_base(vcpu, VCPU_SREG_FS);
2079
2080                 r = x86_decode_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
2081
2082                 /* Reject the instructions other than VMCALL/VMMCALL when
2083                  * try to emulate invalid opcode */
2084                 c = &vcpu->arch.emulate_ctxt.decode;
2085                 if ((emulation_type & EMULTYPE_TRAP_UD) &&
2086                     (!(c->twobyte && c->b == 0x01 &&
2087                       (c->modrm_reg == 0 || c->modrm_reg == 3) &&
2088                        c->modrm_mod == 3 && c->modrm_rm == 1)))
2089                         return EMULATE_FAIL;
2090
2091                 ++vcpu->stat.insn_emulation;
2092                 if (r)  {
2093                         ++vcpu->stat.insn_emulation_fail;
2094                         if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
2095                                 return EMULATE_DONE;
2096                         return EMULATE_FAIL;
2097                 }
2098         }
2099
2100         r = x86_emulate_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
2101
2102         if (vcpu->arch.pio.string)
2103                 return EMULATE_DO_MMIO;
2104
2105         if ((r || vcpu->mmio_is_write) && run) {
2106                 run->exit_reason = KVM_EXIT_MMIO;
2107                 run->mmio.phys_addr = vcpu->mmio_phys_addr;
2108                 memcpy(run->mmio.data, vcpu->mmio_data, 8);
2109                 run->mmio.len = vcpu->mmio_size;
2110                 run->mmio.is_write = vcpu->mmio_is_write;
2111         }
2112
2113         if (r) {
2114                 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
2115                         return EMULATE_DONE;
2116                 if (!vcpu->mmio_needed) {
2117                         kvm_report_emulation_failure(vcpu, "mmio");
2118                         return EMULATE_FAIL;
2119                 }
2120                 return EMULATE_DO_MMIO;
2121         }
2122
2123         kvm_x86_ops->decache_regs(vcpu);
2124         kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
2125
2126         if (vcpu->mmio_is_write) {
2127                 vcpu->mmio_needed = 0;
2128                 return EMULATE_DO_MMIO;
2129         }
2130
2131         return EMULATE_DONE;
2132 }
2133 EXPORT_SYMBOL_GPL(emulate_instruction);
2134
2135 static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
2136 {
2137         int i;
2138
2139         for (i = 0; i < ARRAY_SIZE(vcpu->arch.pio.guest_pages); ++i)
2140                 if (vcpu->arch.pio.guest_pages[i]) {
2141                         kvm_release_page_dirty(vcpu->arch.pio.guest_pages[i]);
2142                         vcpu->arch.pio.guest_pages[i] = NULL;
2143                 }
2144 }
2145
2146 static int pio_copy_data(struct kvm_vcpu *vcpu)
2147 {
2148         void *p = vcpu->arch.pio_data;
2149         void *q;
2150         unsigned bytes;
2151         int nr_pages = vcpu->arch.pio.guest_pages[1] ? 2 : 1;
2152
2153         q = vmap(vcpu->arch.pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
2154                  PAGE_KERNEL);
2155         if (!q) {
2156                 free_pio_guest_pages(vcpu);
2157                 return -ENOMEM;
2158         }
2159         q += vcpu->arch.pio.guest_page_offset;
2160         bytes = vcpu->arch.pio.size * vcpu->arch.pio.cur_count;
2161         if (vcpu->arch.pio.in)
2162                 memcpy(q, p, bytes);
2163         else
2164                 memcpy(p, q, bytes);
2165         q -= vcpu->arch.pio.guest_page_offset;
2166         vunmap(q);
2167         free_pio_guest_pages(vcpu);
2168         return 0;
2169 }
2170
2171 int complete_pio(struct kvm_vcpu *vcpu)
2172 {
2173         struct kvm_pio_request *io = &vcpu->arch.pio;
2174         long delta;
2175         int r;
2176
2177         kvm_x86_ops->cache_regs(vcpu);
2178
2179         if (!io->string) {
2180                 if (io->in)
2181                         memcpy(&vcpu->arch.regs[VCPU_REGS_RAX], vcpu->arch.pio_data,
2182                                io->size);
2183         } else {
2184                 if (io->in) {
2185                         r = pio_copy_data(vcpu);
2186                         if (r) {
2187                                 kvm_x86_ops->cache_regs(vcpu);
2188                                 return r;
2189                         }
2190                 }
2191
2192                 delta = 1;
2193                 if (io->rep) {
2194                         delta *= io->cur_count;
2195                         /*
2196                          * The size of the register should really depend on
2197                          * current address size.
2198                          */
2199                         vcpu->arch.regs[VCPU_REGS_RCX] -= delta;
2200                 }
2201                 if (io->down)
2202                         delta = -delta;
2203                 delta *= io->size;
2204                 if (io->in)
2205                         vcpu->arch.regs[VCPU_REGS_RDI] += delta;
2206                 else
2207                         vcpu->arch.regs[VCPU_REGS_RSI] += delta;
2208         }
2209
2210         kvm_x86_ops->decache_regs(vcpu);
2211
2212         io->count -= io->cur_count;
2213         io->cur_count = 0;
2214
2215         return 0;
2216 }
2217
2218 static void kernel_pio(struct kvm_io_device *pio_dev,
2219                        struct kvm_vcpu *vcpu,
2220                        void *pd)
2221 {
2222         /* TODO: String I/O for in kernel device */
2223
2224         mutex_lock(&vcpu->kvm->lock);
2225         if (vcpu->arch.pio.in)
2226                 kvm_iodevice_read(pio_dev, vcpu->arch.pio.port,
2227                                   vcpu->arch.pio.size,
2228                                   pd);
2229         else
2230                 kvm_iodevice_write(pio_dev, vcpu->arch.pio.port,
2231                                    vcpu->arch.pio.size,
2232                                    pd);
2233         mutex_unlock(&vcpu->kvm->lock);
2234 }
2235
2236 static void pio_string_write(struct kvm_io_device *pio_dev,
2237                              struct kvm_vcpu *vcpu)
2238 {
2239         struct kvm_pio_request *io = &vcpu->arch.pio;
2240         void *pd = vcpu->arch.pio_data;
2241         int i;
2242
2243         mutex_lock(&vcpu->kvm->lock);
2244         for (i = 0; i < io->cur_count; i++) {
2245                 kvm_iodevice_write(pio_dev, io->port,
2246                                    io->size,
2247                                    pd);
2248                 pd += io->size;
2249         }
2250         mutex_unlock(&vcpu->kvm->lock);
2251 }
2252
2253 static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
2254                                                gpa_t addr)
2255 {
2256         return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
2257 }
2258
2259 int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
2260                   int size, unsigned port)
2261 {
2262         struct kvm_io_device *pio_dev;
2263
2264         vcpu->run->exit_reason = KVM_EXIT_IO;
2265         vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
2266         vcpu->run->io.size = vcpu->arch.pio.size = size;
2267         vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
2268         vcpu->run->io.count = vcpu->arch.pio.count = vcpu->arch.pio.cur_count = 1;
2269         vcpu->run->io.port = vcpu->arch.pio.port = port;
2270         vcpu->arch.pio.in = in;
2271         vcpu->arch.pio.string = 0;
2272         vcpu->arch.pio.down = 0;
2273         vcpu->arch.pio.guest_page_offset = 0;
2274         vcpu->arch.pio.rep = 0;
2275
2276         if (vcpu->run->io.direction == KVM_EXIT_IO_IN)
2277                 KVMTRACE_2D(IO_READ, vcpu, vcpu->run->io.port, (u32)size,
2278                             handler);
2279         else
2280                 KVMTRACE_2D(IO_WRITE, vcpu, vcpu->run->io.port, (u32)size,
2281                             handler);
2282
2283         kvm_x86_ops->cache_regs(vcpu);
2284         memcpy(vcpu->arch.pio_data, &vcpu->arch.regs[VCPU_REGS_RAX], 4);
2285         kvm_x86_ops->decache_regs(vcpu);
2286
2287         kvm_x86_ops->skip_emulated_instruction(vcpu);
2288
2289         pio_dev = vcpu_find_pio_dev(vcpu, port);
2290         if (pio_dev) {
2291                 kernel_pio(pio_dev, vcpu, vcpu->arch.pio_data);
2292                 complete_pio(vcpu);
2293                 return 1;
2294         }
2295         return 0;
2296 }
2297 EXPORT_SYMBOL_GPL(kvm_emulate_pio);
2298
2299 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
2300                   int size, unsigned long count, int down,
2301                   gva_t address, int rep, unsigned port)
2302 {
2303         unsigned now, in_page;
2304         int i, ret = 0;
2305         int nr_pages = 1;
2306         struct page *page;
2307         struct kvm_io_device *pio_dev;
2308
2309         vcpu->run->exit_reason = KVM_EXIT_IO;
2310         vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
2311         vcpu->run->io.size = vcpu->arch.pio.size = size;
2312         vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
2313         vcpu->run->io.count = vcpu->arch.pio.count = vcpu->arch.pio.cur_count = count;
2314         vcpu->run->io.port = vcpu->arch.pio.port = port;
2315         vcpu->arch.pio.in = in;
2316         vcpu->arch.pio.string = 1;
2317         vcpu->arch.pio.down = down;
2318         vcpu->arch.pio.guest_page_offset = offset_in_page(address);
2319         vcpu->arch.pio.rep = rep;
2320
2321         if (vcpu->run->io.direction == KVM_EXIT_IO_IN)
2322                 KVMTRACE_2D(IO_READ, vcpu, vcpu->run->io.port, (u32)size,
2323                             handler);
2324         else
2325                 KVMTRACE_2D(IO_WRITE, vcpu, vcpu->run->io.port, (u32)size,
2326                             handler);
2327
2328         if (!count) {
2329                 kvm_x86_ops->skip_emulated_instruction(vcpu);
2330                 return 1;
2331         }
2332
2333         if (!down)
2334                 in_page = PAGE_SIZE - offset_in_page(address);
2335         else
2336                 in_page = offset_in_page(address) + size;
2337         now = min(count, (unsigned long)in_page / size);
2338         if (!now) {
2339                 /*
2340                  * String I/O straddles page boundary.  Pin two guest pages
2341                  * so that we satisfy atomicity constraints.  Do just one
2342                  * transaction to avoid complexity.
2343                  */
2344                 nr_pages = 2;
2345                 now = 1;
2346         }
2347         if (down) {
2348                 /*
2349                  * String I/O in reverse.  Yuck.  Kill the guest, fix later.
2350                  */
2351                 pr_unimpl(vcpu, "guest string pio down\n");
2352                 kvm_inject_gp(vcpu, 0);
2353                 return 1;
2354         }
2355         vcpu->run->io.count = now;
2356         vcpu->arch.pio.cur_count = now;
2357
2358         if (vcpu->arch.pio.cur_count == vcpu->arch.pio.count)
2359                 kvm_x86_ops->skip_emulated_instruction(vcpu);
2360
2361         for (i = 0; i < nr_pages; ++i) {
2362                 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
2363                 vcpu->arch.pio.guest_pages[i] = page;
2364                 if (!page) {
2365                         kvm_inject_gp(vcpu, 0);
2366                         free_pio_guest_pages(vcpu);
2367                         return 1;
2368                 }
2369         }
2370
2371         pio_dev = vcpu_find_pio_dev(vcpu, port);
2372         if (!vcpu->arch.pio.in) {
2373                 /* string PIO write */
2374                 ret = pio_copy_data(vcpu);
2375                 if (ret >= 0 && pio_dev) {
2376                         pio_string_write(pio_dev, vcpu);
2377                         complete_pio(vcpu);
2378                         if (vcpu->arch.pio.count == 0)
2379                                 ret = 1;
2380                 }
2381         } else if (pio_dev)
2382                 pr_unimpl(vcpu, "no string pio read support yet, "
2383                        "port %x size %d count %ld\n",
2384                         port, size, count);
2385
2386         return ret;
2387 }
2388 EXPORT_SYMBOL_GPL(kvm_emulate_pio_string);
2389
2390 int kvm_arch_init(void *opaque)
2391 {
2392         int r;
2393         struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque;
2394
2395         if (kvm_x86_ops) {
2396                 printk(KERN_ERR "kvm: already loaded the other module\n");
2397                 r = -EEXIST;
2398                 goto out;
2399         }
2400
2401         if (!ops->cpu_has_kvm_support()) {
2402                 printk(KERN_ERR "kvm: no hardware support\n");
2403                 r = -EOPNOTSUPP;
2404                 goto out;
2405         }
2406         if (ops->disabled_by_bios()) {
2407                 printk(KERN_ERR "kvm: disabled by bios\n");
2408                 r = -EOPNOTSUPP;
2409                 goto out;
2410         }
2411
2412         r = kvm_mmu_module_init();
2413         if (r)
2414                 goto out;
2415
2416         kvm_init_msr_list();
2417
2418         kvm_x86_ops = ops;
2419         kvm_mmu_set_nonpresent_ptes(0ull, 0ull);
2420         kvm_mmu_set_base_ptes(PT_PRESENT_MASK);
2421         kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK,
2422                         PT_DIRTY_MASK, PT64_NX_MASK, 0);
2423         return 0;
2424
2425 out:
2426         return r;
2427 }
2428
2429 void kvm_arch_exit(void)
2430 {
2431         kvm_x86_ops = NULL;
2432         kvm_mmu_module_exit();
2433 }
2434
2435 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
2436 {
2437         ++vcpu->stat.halt_exits;
2438         KVMTRACE_0D(HLT, vcpu, handler);
2439         if (irqchip_in_kernel(vcpu->kvm)) {
2440                 vcpu->arch.mp_state = KVM_MP_STATE_HALTED;
2441                 up_read(&vcpu->kvm->slots_lock);
2442                 kvm_vcpu_block(vcpu);
2443                 down_read(&vcpu->kvm->slots_lock);
2444                 if (vcpu->arch.mp_state != KVM_MP_STATE_RUNNABLE)
2445                         return -EINTR;
2446                 return 1;
2447         } else {
2448                 vcpu->run->exit_reason = KVM_EXIT_HLT;
2449                 return 0;
2450         }
2451 }
2452 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
2453
2454 static inline gpa_t hc_gpa(struct kvm_vcpu *vcpu, unsigned long a0,
2455                            unsigned long a1)
2456 {
2457         if (is_long_mode(vcpu))
2458                 return a0;
2459         else
2460                 return a0 | ((gpa_t)a1 << 32);
2461 }
2462
2463 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
2464 {
2465         unsigned long nr, a0, a1, a2, a3, ret;
2466         int r = 1;
2467
2468         kvm_x86_ops->cache_regs(vcpu);
2469
2470         nr = vcpu->arch.regs[VCPU_REGS_RAX];
2471         a0 = vcpu->arch.regs[VCPU_REGS_RBX];
2472         a1 = vcpu->arch.regs[VCPU_REGS_RCX];
2473         a2 = vcpu->arch.regs[VCPU_REGS_RDX];
2474         a3 = vcpu->arch.regs[VCPU_REGS_RSI];
2475
2476         KVMTRACE_1D(VMMCALL, vcpu, (u32)nr, handler);
2477
2478         if (!is_long_mode(vcpu)) {
2479                 nr &= 0xFFFFFFFF;
2480                 a0 &= 0xFFFFFFFF;
2481                 a1 &= 0xFFFFFFFF;
2482                 a2 &= 0xFFFFFFFF;
2483                 a3 &= 0xFFFFFFFF;
2484         }
2485
2486         switch (nr) {
2487         case KVM_HC_VAPIC_POLL_IRQ:
2488                 ret = 0;
2489                 break;
2490         case KVM_HC_MMU_OP:
2491                 r = kvm_pv_mmu_op(vcpu, a0, hc_gpa(vcpu, a1, a2), &ret);
2492                 break;
2493         default:
2494                 ret = -KVM_ENOSYS;
2495                 break;
2496         }
2497         vcpu->arch.regs[VCPU_REGS_RAX] = ret;
2498         kvm_x86_ops->decache_regs(vcpu);
2499         ++vcpu->stat.hypercalls;
2500         return r;
2501 }
2502 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
2503
2504 int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
2505 {
2506         char instruction[3];
2507         int ret = 0;
2508
2509
2510         /*
2511          * Blow out the MMU to ensure that no other VCPU has an active mapping
2512          * to ensure that the updated hypercall appears atomically across all
2513          * VCPUs.
2514          */
2515         kvm_mmu_zap_all(vcpu->kvm);
2516
2517         kvm_x86_ops->cache_regs(vcpu);
2518         kvm_x86_ops->patch_hypercall(vcpu, instruction);
2519         if (emulator_write_emulated(vcpu->arch.rip, instruction, 3, vcpu)
2520             != X86EMUL_CONTINUE)
2521                 ret = -EFAULT;
2522
2523         return ret;
2524 }
2525
2526 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
2527 {
2528         return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
2529 }
2530
2531 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
2532 {
2533         struct descriptor_table dt = { limit, base };
2534
2535         kvm_x86_ops->set_gdt(vcpu, &dt);
2536 }
2537
2538 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
2539 {
2540         struct descriptor_table dt = { limit, base };
2541
2542         kvm_x86_ops->set_idt(vcpu, &dt);
2543 }
2544
2545 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
2546                    unsigned long *rflags)
2547 {
2548         kvm_lmsw(vcpu, msw);
2549         *rflags = kvm_x86_ops->get_rflags(vcpu);
2550 }
2551
2552 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
2553 {
2554         kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2555         switch (cr) {
2556         case 0:
2557                 return vcpu->arch.cr0;
2558         case 2:
2559                 return vcpu->arch.cr2;
2560         case 3:
2561                 return vcpu->arch.cr3;
2562         case 4:
2563                 return vcpu->arch.cr4;
2564         case 8:
2565                 return kvm_get_cr8(vcpu);
2566         default:
2567                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
2568                 return 0;
2569         }
2570 }
2571
2572 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
2573                      unsigned long *rflags)
2574 {
2575         switch (cr) {
2576         case 0:
2577                 kvm_set_cr0(vcpu, mk_cr_64(vcpu->arch.cr0, val));
2578                 *rflags = kvm_x86_ops->get_rflags(vcpu);
2579                 break;
2580         case 2:
2581                 vcpu->arch.cr2 = val;
2582                 break;
2583         case 3:
2584                 kvm_set_cr3(vcpu, val);
2585                 break;
2586         case 4:
2587                 kvm_set_cr4(vcpu, mk_cr_64(vcpu->arch.cr4, val));
2588                 break;
2589         case 8:
2590                 kvm_set_cr8(vcpu, val & 0xfUL);
2591                 break;
2592         default:
2593                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
2594         }
2595 }
2596
2597 static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i)
2598 {
2599         struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i];
2600         int j, nent = vcpu->arch.cpuid_nent;
2601
2602         e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT;
2603         /* when no next entry is found, the current entry[i] is reselected */
2604         for (j = i + 1; j == i; j = (j + 1) % nent) {
2605                 struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j];
2606                 if (ej->function == e->function) {
2607                         ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
2608                         return j;
2609                 }
2610         }
2611         return 0; /* silence gcc, even though control never reaches here */
2612 }
2613
2614 /* find an entry with matching function, matching index (if needed), and that
2615  * should be read next (if it's stateful) */
2616 static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e,
2617         u32 function, u32 index)
2618 {
2619         if (e->function != function)
2620                 return 0;
2621         if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index)
2622                 return 0;
2623         if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) &&
2624                 !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT))
2625                 return 0;
2626         return 1;
2627 }
2628
2629 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
2630 {
2631         int i;
2632         u32 function, index;
2633         struct kvm_cpuid_entry2 *e, *best;
2634
2635         kvm_x86_ops->cache_regs(vcpu);
2636         function = vcpu->arch.regs[VCPU_REGS_RAX];
2637         index = vcpu->arch.regs[VCPU_REGS_RCX];
2638         vcpu->arch.regs[VCPU_REGS_RAX] = 0;
2639         vcpu->arch.regs[VCPU_REGS_RBX] = 0;
2640         vcpu->arch.regs[VCPU_REGS_RCX] = 0;
2641         vcpu->arch.regs[VCPU_REGS_RDX] = 0;
2642         best = NULL;
2643         for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
2644                 e = &vcpu->arch.cpuid_entries[i];
2645                 if (is_matching_cpuid_entry(e, function, index)) {
2646                         if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC)
2647                                 move_to_next_stateful_cpuid_entry(vcpu, i);
2648                         best = e;
2649                         break;
2650                 }
2651                 /*
2652                  * Both basic or both extended?
2653                  */
2654                 if (((e->function ^ function) & 0x80000000) == 0)
2655                         if (!best || e->function > best->function)
2656                                 best = e;
2657         }
2658         if (best) {
2659                 vcpu->arch.regs[VCPU_REGS_RAX] = best->eax;
2660                 vcpu->arch.regs[VCPU_REGS_RBX] = best->ebx;
2661                 vcpu->arch.regs[VCPU_REGS_RCX] = best->ecx;
2662                 vcpu->arch.regs[VCPU_REGS_RDX] = best->edx;
2663         }
2664         kvm_x86_ops->decache_regs(vcpu);
2665         kvm_x86_ops->skip_emulated_instruction(vcpu);
2666         KVMTRACE_5D(CPUID, vcpu, function,
2667                     (u32)vcpu->arch.regs[VCPU_REGS_RAX],
2668                     (u32)vcpu->arch.regs[VCPU_REGS_RBX],
2669                     (u32)vcpu->arch.regs[VCPU_REGS_RCX],
2670                     (u32)vcpu->arch.regs[VCPU_REGS_RDX], handler);
2671 }
2672 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
2673
2674 /*
2675  * Check if userspace requested an interrupt window, and that the
2676  * interrupt window is open.
2677  *
2678  * No need to exit to userspace if we already have an interrupt queued.
2679  */
2680 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu,
2681                                           struct kvm_run *kvm_run)
2682 {
2683         return (!vcpu->arch.irq_summary &&
2684                 kvm_run->request_interrupt_window &&
2685                 vcpu->arch.interrupt_window_open &&
2686                 (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF));
2687 }
2688
2689 static void post_kvm_run_save(struct kvm_vcpu *vcpu,
2690                               struct kvm_run *kvm_run)
2691 {
2692         kvm_run->if_flag = (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
2693         kvm_run->cr8 = kvm_get_cr8(vcpu);
2694         kvm_run->apic_base = kvm_get_apic_base(vcpu);
2695         if (irqchip_in_kernel(vcpu->kvm))
2696                 kvm_run->ready_for_interrupt_injection = 1;
2697         else
2698                 kvm_run->ready_for_interrupt_injection =
2699                                         (vcpu->arch.interrupt_window_open &&
2700                                          vcpu->arch.irq_summary == 0);
2701 }
2702
2703 static void vapic_enter(struct kvm_vcpu *vcpu)
2704 {
2705         struct kvm_lapic *apic = vcpu->arch.apic;
2706         struct page *page;
2707
2708         if (!apic || !apic->vapic_addr)
2709                 return;
2710
2711         down_read(&current->mm->mmap_sem);
2712         page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
2713         up_read(&current->mm->mmap_sem);
2714
2715         vcpu->arch.apic->vapic_page = page;
2716 }
2717
2718 static void vapic_exit(struct kvm_vcpu *vcpu)
2719 {
2720         struct kvm_lapic *apic = vcpu->arch.apic;
2721
2722         if (!apic || !apic->vapic_addr)
2723                 return;
2724
2725         kvm_release_page_dirty(apic->vapic_page);
2726         mark_page_dirty(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
2727 }
2728
2729 static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2730 {
2731         int r;
2732
2733         if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED)) {
2734                 pr_debug("vcpu %d received sipi with vector # %x\n",
2735                        vcpu->vcpu_id, vcpu->arch.sipi_vector);
2736                 kvm_lapic_reset(vcpu);
2737                 r = kvm_x86_ops->vcpu_reset(vcpu);
2738                 if (r)
2739                         return r;
2740                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
2741         }
2742
2743         down_read(&vcpu->kvm->slots_lock);
2744         vapic_enter(vcpu);
2745
2746 preempted:
2747         if (vcpu->guest_debug.enabled)
2748                 kvm_x86_ops->guest_debug_pre(vcpu);
2749
2750 again:
2751         if (vcpu->requests)
2752                 if (test_and_clear_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests))
2753                         kvm_mmu_unload(vcpu);
2754
2755         r = kvm_mmu_reload(vcpu);
2756         if (unlikely(r))
2757                 goto out;
2758
2759         if (vcpu->requests) {
2760                 if (test_and_clear_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests))
2761                         __kvm_migrate_timers(vcpu);
2762                 if (test_and_clear_bit(KVM_REQ_REPORT_TPR_ACCESS,
2763                                        &vcpu->requests)) {
2764                         kvm_run->exit_reason = KVM_EXIT_TPR_ACCESS;
2765                         r = 0;
2766                         goto out;
2767                 }
2768                 if (test_and_clear_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests)) {
2769                         kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
2770                         r = 0;
2771                         goto out;
2772                 }
2773         }
2774
2775         kvm_inject_pending_timer_irqs(vcpu);
2776
2777         preempt_disable();
2778
2779         kvm_x86_ops->prepare_guest_switch(vcpu);
2780         kvm_load_guest_fpu(vcpu);
2781
2782         local_irq_disable();
2783
2784         if (need_resched()) {
2785                 local_irq_enable();
2786                 preempt_enable();
2787                 r = 1;
2788                 goto out;
2789         }
2790
2791         if (vcpu->requests)
2792                 if (test_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests)) {
2793                         local_irq_enable();
2794                         preempt_enable();
2795                         r = 1;
2796                         goto out;
2797                 }
2798
2799         if (signal_pending(current)) {
2800                 local_irq_enable();
2801                 preempt_enable();
2802                 r = -EINTR;
2803                 kvm_run->exit_reason = KVM_EXIT_INTR;
2804                 ++vcpu->stat.signal_exits;
2805                 goto out;
2806         }
2807
2808         vcpu->guest_mode = 1;
2809         /*
2810          * Make sure that guest_mode assignment won't happen after
2811          * testing the pending IRQ vector bitmap.
2812          */
2813         smp_wmb();
2814
2815         if (vcpu->arch.exception.pending)
2816                 __queue_exception(vcpu);
2817         else if (irqchip_in_kernel(vcpu->kvm))
2818                 kvm_x86_ops->inject_pending_irq(vcpu);
2819         else
2820                 kvm_x86_ops->inject_pending_vectors(vcpu, kvm_run);
2821
2822         kvm_lapic_sync_to_vapic(vcpu);
2823
2824         up_read(&vcpu->kvm->slots_lock);
2825
2826         kvm_guest_enter();
2827
2828         if (vcpu->requests)
2829                 if (test_and_clear_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
2830                         kvm_x86_ops->tlb_flush(vcpu);
2831
2832         KVMTRACE_0D(VMENTRY, vcpu, entryexit);
2833         kvm_x86_ops->run(vcpu, kvm_run);
2834
2835         vcpu->guest_mode = 0;
2836         local_irq_enable();
2837
2838         ++vcpu->stat.exits;
2839
2840         /*
2841          * We must have an instruction between local_irq_enable() and
2842          * kvm_guest_exit(), so the timer interrupt isn't delayed by
2843          * the interrupt shadow.  The stat.exits increment will do nicely.
2844          * But we need to prevent reordering, hence this barrier():
2845          */
2846         barrier();
2847
2848         kvm_guest_exit();
2849
2850         preempt_enable();
2851
2852         down_read(&vcpu->kvm->slots_lock);
2853
2854         /*
2855          * Profile KVM exit RIPs:
2856          */
2857         if (unlikely(prof_on == KVM_PROFILING)) {
2858                 kvm_x86_ops->cache_regs(vcpu);
2859                 profile_hit(KVM_PROFILING, (void *)vcpu->arch.rip);
2860         }
2861
2862         if (vcpu->arch.exception.pending && kvm_x86_ops->exception_injected(vcpu))
2863                 vcpu->arch.exception.pending = false;
2864
2865         kvm_lapic_sync_from_vapic(vcpu);
2866
2867         r = kvm_x86_ops->handle_exit(kvm_run, vcpu);
2868
2869         if (r > 0) {
2870                 if (dm_request_for_irq_injection(vcpu, kvm_run)) {
2871                         r = -EINTR;
2872                         kvm_run->exit_reason = KVM_EXIT_INTR;
2873                         ++vcpu->stat.request_irq_exits;
2874                         goto out;
2875                 }
2876                 if (!need_resched())
2877                         goto again;
2878         }
2879
2880 out:
2881         up_read(&vcpu->kvm->slots_lock);
2882         if (r > 0) {
2883                 kvm_resched(vcpu);
2884                 down_read(&vcpu->kvm->slots_lock);
2885                 goto preempted;
2886         }
2887
2888         post_kvm_run_save(vcpu, kvm_run);
2889
2890         down_read(&vcpu->kvm->slots_lock);
2891         vapic_exit(vcpu);
2892         up_read(&vcpu->kvm->slots_lock);
2893
2894         return r;
2895 }
2896
2897 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2898 {
2899         int r;
2900         sigset_t sigsaved;
2901
2902         vcpu_load(vcpu);
2903
2904         if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
2905                 kvm_vcpu_block(vcpu);
2906                 vcpu_put(vcpu);
2907                 return -EAGAIN;
2908         }
2909
2910         if (vcpu->sigset_active)
2911                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
2912
2913         /* re-sync apic's tpr */
2914         if (!irqchip_in_kernel(vcpu->kvm))
2915                 kvm_set_cr8(vcpu, kvm_run->cr8);
2916
2917         if (vcpu->arch.pio.cur_count) {
2918                 r = complete_pio(vcpu);
2919                 if (r)
2920                         goto out;
2921         }
2922 #if CONFIG_HAS_IOMEM
2923         if (vcpu->mmio_needed) {
2924                 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
2925                 vcpu->mmio_read_completed = 1;
2926                 vcpu->mmio_needed = 0;
2927
2928                 down_read(&vcpu->kvm->slots_lock);
2929                 r = emulate_instruction(vcpu, kvm_run,
2930                                         vcpu->arch.mmio_fault_cr2, 0,
2931                                         EMULTYPE_NO_DECODE);
2932                 up_read(&vcpu->kvm->slots_lock);
2933                 if (r == EMULATE_DO_MMIO) {
2934                         /*
2935                          * Read-modify-write.  Back to userspace.
2936                          */
2937                         r = 0;
2938                         goto out;
2939                 }
2940         }
2941 #endif
2942         if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
2943                 kvm_x86_ops->cache_regs(vcpu);
2944                 vcpu->arch.regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
2945                 kvm_x86_ops->decache_regs(vcpu);
2946         }
2947
2948         r = __vcpu_run(vcpu, kvm_run);
2949
2950 out:
2951         if (vcpu->sigset_active)
2952                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2953
2954         vcpu_put(vcpu);
2955         return r;
2956 }
2957
2958 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
2959 {
2960         vcpu_load(vcpu);
2961
2962         kvm_x86_ops->cache_regs(vcpu);
2963
2964         regs->rax = vcpu->arch.regs[VCPU_REGS_RAX];
2965         regs->rbx = vcpu->arch.regs[VCPU_REGS_RBX];
2966         regs->rcx = vcpu->arch.regs[VCPU_REGS_RCX];
2967         regs->rdx = vcpu->arch.regs[VCPU_REGS_RDX];
2968         regs->rsi = vcpu->arch.regs[VCPU_REGS_RSI];
2969         regs->rdi = vcpu->arch.regs[VCPU_REGS_RDI];
2970         regs->rsp = vcpu->arch.regs[VCPU_REGS_RSP];
2971         regs->rbp = vcpu->arch.regs[VCPU_REGS_RBP];
2972 #ifdef CONFIG_X86_64
2973         regs->r8 = vcpu->arch.regs[VCPU_REGS_R8];
2974         regs->r9 = vcpu->arch.regs[VCPU_REGS_R9];
2975         regs->r10 = vcpu->arch.regs[VCPU_REGS_R10];
2976         regs->r11 = vcpu->arch.regs[VCPU_REGS_R11];
2977         regs->r12 = vcpu->arch.regs[VCPU_REGS_R12];
2978         regs->r13 = vcpu->arch.regs[VCPU_REGS_R13];
2979         regs->r14 = vcpu->arch.regs[VCPU_REGS_R14];
2980         regs->r15 = vcpu->arch.regs[VCPU_REGS_R15];
2981 #endif
2982
2983         regs->rip = vcpu->arch.rip;
2984         regs->rflags = kvm_x86_ops->get_rflags(vcpu);
2985
2986         /*
2987          * Don't leak debug flags in case they were set for guest debugging
2988          */
2989         if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
2990                 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
2991
2992         vcpu_put(vcpu);
2993
2994         return 0;
2995 }
2996
2997 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
2998 {
2999         vcpu_load(vcpu);
3000
3001         vcpu->arch.regs[VCPU_REGS_RAX] = regs->rax;
3002         vcpu->arch.regs[VCPU_REGS_RBX] = regs->rbx;
3003         vcpu->arch.regs[VCPU_REGS_RCX] = regs->rcx;
3004         vcpu->arch.regs[VCPU_REGS_RDX] = regs->rdx;
3005         vcpu->arch.regs[VCPU_REGS_RSI] = regs->rsi;
3006         vcpu->arch.regs[VCPU_REGS_RDI] = regs->rdi;
3007         vcpu->arch.regs[VCPU_REGS_RSP] = regs->rsp;
3008         vcpu->arch.regs[VCPU_REGS_RBP] = regs->rbp;
3009 #ifdef CONFIG_X86_64
3010         vcpu->arch.regs[VCPU_REGS_R8] = regs->r8;
3011         vcpu->arch.regs[VCPU_REGS_R9] = regs->r9;
3012         vcpu->arch.regs[VCPU_REGS_R10] = regs->r10;
3013         vcpu->arch.regs[VCPU_REGS_R11] = regs->r11;
3014         vcpu->arch.regs[VCPU_REGS_R12] = regs->r12;
3015         vcpu->arch.regs[VCPU_REGS_R13] = regs->r13;
3016         vcpu->arch.regs[VCPU_REGS_R14] = regs->r14;
3017         vcpu->arch.regs[VCPU_REGS_R15] = regs->r15;
3018 #endif
3019
3020         vcpu->arch.rip = regs->rip;
3021         kvm_x86_ops->set_rflags(vcpu, regs->rflags);
3022
3023         kvm_x86_ops->decache_regs(vcpu);
3024
3025         vcpu->arch.exception.pending = false;
3026
3027         vcpu_put(vcpu);
3028
3029         return 0;
3030 }
3031
3032 static void get_segment(struct kvm_vcpu *vcpu,
3033                         struct kvm_segment *var, int seg)
3034 {
3035         kvm_x86_ops->get_segment(vcpu, var, seg);
3036 }
3037
3038 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
3039 {
3040         struct kvm_segment cs;
3041
3042         get_segment(vcpu, &cs, VCPU_SREG_CS);
3043         *db = cs.db;
3044         *l = cs.l;
3045 }
3046 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
3047
3048 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
3049                                   struct kvm_sregs *sregs)
3050 {
3051         struct descriptor_table dt;
3052         int pending_vec;
3053
3054         vcpu_load(vcpu);
3055
3056         get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
3057         get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
3058         get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
3059         get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
3060         get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
3061         get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
3062
3063         get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
3064         get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
3065
3066         kvm_x86_ops->get_idt(vcpu, &dt);
3067         sregs->idt.limit = dt.limit;
3068         sregs->idt.base = dt.base;
3069         kvm_x86_ops->get_gdt(vcpu, &dt);
3070         sregs->gdt.limit = dt.limit;
3071         sregs->gdt.base = dt.base;
3072
3073         kvm_x86_ops->decache_cr4_guest_bits(vcpu);
3074         sregs->cr0 = vcpu->arch.cr0;
3075         sregs->cr2 = vcpu->arch.cr2;
3076         sregs->cr3 = vcpu->arch.cr3;
3077         sregs->cr4 = vcpu->arch.cr4;
3078         sregs->cr8 = kvm_get_cr8(vcpu);
3079         sregs->efer = vcpu->arch.shadow_efer;
3080         sregs->apic_base = kvm_get_apic_base(vcpu);
3081
3082         if (irqchip_in_kernel(vcpu->kvm)) {
3083                 memset(sregs->interrupt_bitmap, 0,
3084                        sizeof sregs->interrupt_bitmap);
3085                 pending_vec = kvm_x86_ops->get_irq(vcpu);
3086                 if (pending_vec >= 0)
3087                         set_bit(pending_vec,
3088                                 (unsigned long *)sregs->interrupt_bitmap);
3089         } else
3090                 memcpy(sregs->interrupt_bitmap, vcpu->arch.irq_pending,
3091                        sizeof sregs->interrupt_bitmap);
3092
3093         vcpu_put(vcpu);
3094
3095         return 0;
3096 }
3097
3098 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
3099                                     struct kvm_mp_state *mp_state)
3100 {
3101         vcpu_load(vcpu);
3102         mp_state->mp_state = vcpu->arch.mp_state;
3103         vcpu_put(vcpu);
3104         return 0;
3105 }
3106
3107 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
3108                                     struct kvm_mp_state *mp_state)
3109 {
3110         vcpu_load(vcpu);
3111         vcpu->arch.mp_state = mp_state->mp_state;
3112         vcpu_put(vcpu);
3113         return 0;
3114 }
3115
3116 static void set_segment(struct kvm_vcpu *vcpu,
3117                         struct kvm_segment *var, int seg)
3118 {
3119         kvm_x86_ops->set_segment(vcpu, var, seg);
3120 }
3121
3122 static void seg_desct_to_kvm_desct(struct desc_struct *seg_desc, u16 selector,
3123                                    struct kvm_segment *kvm_desct)
3124 {
3125         kvm_desct->base = seg_desc->base0;
3126         kvm_desct->base |= seg_desc->base1 << 16;
3127         kvm_desct->base |= seg_desc->base2 << 24;
3128         kvm_desct->limit = seg_desc->limit0;
3129         kvm_desct->limit |= seg_desc->limit << 16;
3130         kvm_desct->selector = selector;
3131         kvm_desct->type = seg_desc->type;
3132         kvm_desct->present = seg_desc->p;
3133         kvm_desct->dpl = seg_desc->dpl;
3134         kvm_desct->db = seg_desc->d;
3135         kvm_desct->s = seg_desc->s;
3136         kvm_desct->l = seg_desc->l;
3137         kvm_desct->g = seg_desc->g;
3138         kvm_desct->avl = seg_desc->avl;
3139         if (!selector)
3140                 kvm_desct->unusable = 1;
3141         else
3142                 kvm_desct->unusable = 0;
3143         kvm_desct->padding = 0;
3144 }
3145
3146 static void get_segment_descritptor_dtable(struct kvm_vcpu *vcpu,
3147                                            u16 selector,
3148                                            struct descriptor_table *dtable)
3149 {
3150         if (selector & 1 << 2) {
3151                 struct kvm_segment kvm_seg;
3152
3153                 get_segment(vcpu, &kvm_seg, VCPU_SREG_LDTR);
3154
3155                 if (kvm_seg.unusable)
3156                         dtable->limit = 0;
3157                 else
3158                         dtable->limit = kvm_seg.limit;
3159                 dtable->base = kvm_seg.base;
3160         }
3161         else
3162                 kvm_x86_ops->get_gdt(vcpu, dtable);
3163 }
3164
3165 /* allowed just for 8 bytes segments */
3166 static int load_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
3167                                          struct desc_struct *seg_desc)
3168 {
3169         struct descriptor_table dtable;
3170         u16 index = selector >> 3;
3171
3172         get_segment_descritptor_dtable(vcpu, selector, &dtable);
3173
3174         if (dtable.limit < index * 8 + 7) {
3175                 kvm_queue_exception_e(vcpu, GP_VECTOR, selector & 0xfffc);
3176                 return 1;
3177         }
3178         return kvm_read_guest(vcpu->kvm, dtable.base + index * 8, seg_desc, 8);
3179 }
3180
3181 /* allowed just for 8 bytes segments */
3182 static int save_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
3183                                          struct desc_struct *seg_desc)
3184 {
3185         struct descriptor_table dtable;
3186         u16 index = selector >> 3;
3187
3188         get_segment_descritptor_dtable(vcpu, selector, &dtable);
3189
3190         if (dtable.limit < index * 8 + 7)
3191                 return 1;
3192         return kvm_write_guest(vcpu->kvm, dtable.base + index * 8, seg_desc, 8);
3193 }
3194
3195 static u32 get_tss_base_addr(struct kvm_vcpu *vcpu,
3196                              struct desc_struct *seg_desc)
3197 {
3198         u32 base_addr;
3199
3200         base_addr = seg_desc->base0;
3201         base_addr |= (seg_desc->base1 << 16);
3202         base_addr |= (seg_desc->base2 << 24);
3203
3204         return base_addr;
3205 }
3206
3207 static int load_tss_segment32(struct kvm_vcpu *vcpu,
3208                               struct desc_struct *seg_desc,
3209                               struct tss_segment_32 *tss)
3210 {
3211         u32 base_addr;
3212
3213         base_addr = get_tss_base_addr(vcpu, seg_desc);
3214
3215         return kvm_read_guest(vcpu->kvm, base_addr, tss,
3216                               sizeof(struct tss_segment_32));
3217 }
3218
3219 static int save_tss_segment32(struct kvm_vcpu *vcpu,
3220                               struct desc_struct *seg_desc,
3221                               struct tss_segment_32 *tss)
3222 {
3223         u32 base_addr;
3224
3225         base_addr = get_tss_base_addr(vcpu, seg_desc);
3226
3227         return kvm_write_guest(vcpu->kvm, base_addr, tss,
3228                                sizeof(struct tss_segment_32));
3229 }
3230
3231 static int load_tss_segment16(struct kvm_vcpu *vcpu,
3232                               struct desc_struct *seg_desc,
3233                               struct tss_segment_16 *tss)
3234 {
3235         u32 base_addr;
3236
3237         base_addr = get_tss_base_addr(vcpu, seg_desc);
3238
3239         return kvm_read_guest(vcpu->kvm, base_addr, tss,
3240                               sizeof(struct tss_segment_16));
3241 }
3242
3243 static int save_tss_segment16(struct kvm_vcpu *vcpu,
3244                               struct desc_struct *seg_desc,
3245                               struct tss_segment_16 *tss)
3246 {
3247         u32 base_addr;
3248
3249         base_addr = get_tss_base_addr(vcpu, seg_desc);
3250
3251         return kvm_write_guest(vcpu->kvm, base_addr, tss,
3252                                sizeof(struct tss_segment_16));
3253 }
3254
3255 static u16 get_segment_selector(struct kvm_vcpu *vcpu, int seg)
3256 {
3257         struct kvm_segment kvm_seg;
3258
3259         get_segment(vcpu, &kvm_seg, seg);
3260         return kvm_seg.selector;
3261 }
3262
3263 static int load_segment_descriptor_to_kvm_desct(struct kvm_vcpu *vcpu,
3264                                                 u16 selector,
3265                                                 struct kvm_segment *kvm_seg)
3266 {
3267         struct desc_struct seg_desc;
3268
3269         if (load_guest_segment_descriptor(vcpu, selector, &seg_desc))
3270                 return 1;
3271         seg_desct_to_kvm_desct(&seg_desc, selector, kvm_seg);
3272         return 0;
3273 }
3274
3275 static int load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
3276                                    int type_bits, int seg)
3277 {
3278         struct kvm_segment kvm_seg;
3279
3280         if (load_segment_descriptor_to_kvm_desct(vcpu, selector, &kvm_seg))
3281                 return 1;
3282         kvm_seg.type |= type_bits;
3283
3284         if (seg != VCPU_SREG_SS && seg != VCPU_SREG_CS &&
3285             seg != VCPU_SREG_LDTR)
3286                 if (!kvm_seg.s)
3287                         kvm_seg.unusable = 1;
3288
3289         set_segment(vcpu, &kvm_seg, seg);
3290         return 0;
3291 }
3292
3293 static void save_state_to_tss32(struct kvm_vcpu *vcpu,
3294                                 struct tss_segment_32 *tss)
3295 {
3296         tss->cr3 = vcpu->arch.cr3;
3297         tss->eip = vcpu->arch.rip;
3298         tss->eflags = kvm_x86_ops->get_rflags(vcpu);
3299         tss->eax = vcpu->arch.regs[VCPU_REGS_RAX];
3300         tss->ecx = vcpu->arch.regs[VCPU_REGS_RCX];
3301         tss->edx = vcpu->arch.regs[VCPU_REGS_RDX];
3302         tss->ebx = vcpu->arch.regs[VCPU_REGS_RBX];
3303         tss->esp = vcpu->arch.regs[VCPU_REGS_RSP];
3304         tss->ebp = vcpu->arch.regs[VCPU_REGS_RBP];
3305         tss->esi = vcpu->arch.regs[VCPU_REGS_RSI];
3306         tss->edi = vcpu->arch.regs[VCPU_REGS_RDI];
3307
3308         tss->es = get_segment_selector(vcpu, VCPU_SREG_ES);
3309         tss->cs = get_segment_selector(vcpu, VCPU_SREG_CS);
3310         tss->ss = get_segment_selector(vcpu, VCPU_SREG_SS);
3311         tss->ds = get_segment_selector(vcpu, VCPU_SREG_DS);
3312         tss->fs = get_segment_selector(vcpu, VCPU_SREG_FS);
3313         tss->gs = get_segment_selector(vcpu, VCPU_SREG_GS);
3314         tss->ldt_selector = get_segment_selector(vcpu, VCPU_SREG_LDTR);
3315         tss->prev_task_link = get_segment_selector(vcpu, VCPU_SREG_TR);
3316 }
3317
3318 static int load_state_from_tss32(struct kvm_vcpu *vcpu,
3319                                   struct tss_segment_32 *tss)
3320 {
3321         kvm_set_cr3(vcpu, tss->cr3);
3322
3323         vcpu->arch.rip = tss->eip;
3324         kvm_x86_ops->set_rflags(vcpu, tss->eflags | 2);
3325
3326         vcpu->arch.regs[VCPU_REGS_RAX] = tss->eax;
3327         vcpu->arch.regs[VCPU_REGS_RCX] = tss->ecx;
3328         vcpu->arch.regs[VCPU_REGS_RDX] = tss->edx;
3329         vcpu->arch.regs[VCPU_REGS_RBX] = tss->ebx;
3330         vcpu->arch.regs[VCPU_REGS_RSP] = tss->esp;
3331         vcpu->arch.regs[VCPU_REGS_RBP] = tss->ebp;
3332         vcpu->arch.regs[VCPU_REGS_RSI] = tss->esi;
3333         vcpu->arch.regs[VCPU_REGS_RDI] = tss->edi;
3334
3335         if (load_segment_descriptor(vcpu, tss->ldt_selector, 0, VCPU_SREG_LDTR))
3336                 return 1;
3337
3338         if (load_segment_descriptor(vcpu, tss->es, 1, VCPU_SREG_ES))
3339                 return 1;
3340
3341         if (load_segment_descriptor(vcpu, tss->cs, 9, VCPU_SREG_CS))
3342                 return 1;
3343
3344         if (load_segment_descriptor(vcpu, tss->ss, 1, VCPU_SREG_SS))
3345                 return 1;
3346
3347         if (load_segment_descriptor(vcpu, tss->ds, 1, VCPU_SREG_DS))
3348                 return 1;
3349
3350         if (load_segment_descriptor(vcpu, tss->fs, 1, VCPU_SREG_FS))
3351                 return 1;
3352
3353         if (load_segment_descriptor(vcpu, tss->gs, 1, VCPU_SREG_GS))
3354                 return 1;
3355         return 0;
3356 }
3357
3358 static void save_state_to_tss16(struct kvm_vcpu *vcpu,
3359                                 struct tss_segment_16 *tss)
3360 {
3361         tss->ip = vcpu->arch.rip;
3362         tss->flag = kvm_x86_ops->get_rflags(vcpu);
3363         tss->ax = vcpu->arch.regs[VCPU_REGS_RAX];
3364         tss->cx = vcpu->arch.regs[VCPU_REGS_RCX];
3365         tss->dx = vcpu->arch.regs[VCPU_REGS_RDX];
3366         tss->bx = vcpu->arch.regs[VCPU_REGS_RBX];
3367         tss->sp = vcpu->arch.regs[VCPU_REGS_RSP];
3368         tss->bp = vcpu->arch.regs[VCPU_REGS_RBP];
3369         tss->si = vcpu->arch.regs[VCPU_REGS_RSI];
3370         tss->di = vcpu->arch.regs[VCPU_REGS_RDI];
3371
3372         tss->es = get_segment_selector(vcpu, VCPU_SREG_ES);
3373         tss->cs = get_segment_selector(vcpu, VCPU_SREG_CS);
3374         tss->ss = get_segment_selector(vcpu, VCPU_SREG_SS);
3375         tss->ds = get_segment_selector(vcpu, VCPU_SREG_DS);
3376         tss->ldt = get_segment_selector(vcpu, VCPU_SREG_LDTR);
3377         tss->prev_task_link = get_segment_selector(vcpu, VCPU_SREG_TR);
3378 }
3379
3380 static int load_state_from_tss16(struct kvm_vcpu *vcpu,
3381                                  struct tss_segment_16 *tss)
3382 {
3383         vcpu->arch.rip = tss->ip;
3384         kvm_x86_ops->set_rflags(vcpu, tss->flag | 2);
3385         vcpu->arch.regs[VCPU_REGS_RAX] = tss->ax;
3386         vcpu->arch.regs[VCPU_REGS_RCX] = tss->cx;
3387         vcpu->arch.regs[VCPU_REGS_RDX] = tss->dx;
3388         vcpu->arch.regs[VCPU_REGS_RBX] = tss->bx;
3389         vcpu->arch.regs[VCPU_REGS_RSP] = tss->sp;
3390         vcpu->arch.regs[VCPU_REGS_RBP] = tss->bp;
3391         vcpu->arch.regs[VCPU_REGS_RSI] = tss->si;
3392         vcpu->arch.regs[VCPU_REGS_RDI] = tss->di;
3393
3394         if (load_segment_descriptor(vcpu, tss->ldt, 0, VCPU_SREG_LDTR))
3395                 return 1;
3396
3397         if (load_segment_descriptor(vcpu, tss->es, 1, VCPU_SREG_ES))
3398                 return 1;
3399
3400         if (load_segment_descriptor(vcpu, tss->cs, 9, VCPU_SREG_CS))
3401                 return 1;
3402
3403         if (load_segment_descriptor(vcpu, tss->ss, 1, VCPU_SREG_SS))
3404                 return 1;
3405
3406         if (load_segment_descriptor(vcpu, tss->ds, 1, VCPU_SREG_DS))
3407                 return 1;
3408         return 0;
3409 }
3410
3411 int kvm_task_switch_16(struct kvm_vcpu *vcpu, u16 tss_selector,
3412                        struct desc_struct *cseg_desc,
3413                        struct desc_struct *nseg_desc)
3414 {
3415         struct tss_segment_16 tss_segment_16;
3416         int ret = 0;
3417
3418         if (load_tss_segment16(vcpu, cseg_desc, &tss_segment_16))
3419                 goto out;
3420
3421         save_state_to_tss16(vcpu, &tss_segment_16);
3422         save_tss_segment16(vcpu, cseg_desc, &tss_segment_16);
3423
3424         if (load_tss_segment16(vcpu, nseg_desc, &tss_segment_16))
3425                 goto out;
3426         if (load_state_from_tss16(vcpu, &tss_segment_16))
3427                 goto out;
3428
3429         ret = 1;
3430 out:
3431         return ret;
3432 }
3433
3434 int kvm_task_switch_32(struct kvm_vcpu *vcpu, u16 tss_selector,
3435                        struct desc_struct *cseg_desc,
3436                        struct desc_struct *nseg_desc)
3437 {
3438         struct tss_segment_32 tss_segment_32;
3439         int ret = 0;
3440
3441         if (load_tss_segment32(vcpu, cseg_desc, &tss_segment_32))
3442                 goto out;
3443
3444         save_state_to_tss32(vcpu, &tss_segment_32);
3445         save_tss_segment32(vcpu, cseg_desc, &tss_segment_32);
3446
3447         if (load_tss_segment32(vcpu, nseg_desc, &tss_segment_32))
3448                 goto out;
3449         if (load_state_from_tss32(vcpu, &tss_segment_32))
3450                 goto out;
3451
3452         ret = 1;
3453 out:
3454         return ret;
3455 }
3456
3457 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason)
3458 {
3459         struct kvm_segment tr_seg;
3460         struct desc_struct cseg_desc;
3461         struct desc_struct nseg_desc;
3462         int ret = 0;
3463
3464         get_segment(vcpu, &tr_seg, VCPU_SREG_TR);
3465
3466         if (load_guest_segment_descriptor(vcpu, tss_selector, &nseg_desc))
3467                 goto out;
3468
3469         if (load_guest_segment_descriptor(vcpu, tr_seg.selector, &cseg_desc))
3470                 goto out;
3471
3472
3473         if (reason != TASK_SWITCH_IRET) {
3474                 int cpl;
3475
3476                 cpl = kvm_x86_ops->get_cpl(vcpu);
3477                 if ((tss_selector & 3) > nseg_desc.dpl || cpl > nseg_desc.dpl) {
3478                         kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
3479                         return 1;
3480                 }
3481         }
3482
3483         if (!nseg_desc.p || (nseg_desc.limit0 | nseg_desc.limit << 16) < 0x67) {
3484                 kvm_queue_exception_e(vcpu, TS_VECTOR, tss_selector & 0xfffc);
3485                 return 1;
3486         }
3487
3488         if (reason == TASK_SWITCH_IRET || reason == TASK_SWITCH_JMP) {
3489                 cseg_desc.type &= ~(1 << 1); //clear the B flag
3490                 save_guest_segment_descriptor(vcpu, tr_seg.selector,
3491                                               &cseg_desc);
3492         }
3493
3494         if (reason == TASK_SWITCH_IRET) {
3495                 u32 eflags = kvm_x86_ops->get_rflags(vcpu);
3496                 kvm_x86_ops->set_rflags(vcpu, eflags & ~X86_EFLAGS_NT);
3497         }
3498
3499         kvm_x86_ops->skip_emulated_instruction(vcpu);
3500         kvm_x86_ops->cache_regs(vcpu);
3501
3502         if (nseg_desc.type & 8)
3503                 ret = kvm_task_switch_32(vcpu, tss_selector, &cseg_desc,
3504                                          &nseg_desc);
3505         else
3506                 ret = kvm_task_switch_16(vcpu, tss_selector, &cseg_desc,
3507                                          &nseg_desc);
3508
3509         if (reason == TASK_SWITCH_CALL || reason == TASK_SWITCH_GATE) {
3510                 u32 eflags = kvm_x86_ops->get_rflags(vcpu);
3511                 kvm_x86_ops->set_rflags(vcpu, eflags | X86_EFLAGS_NT);
3512         }
3513
3514         if (reason != TASK_SWITCH_IRET) {
3515                 nseg_desc.type |= (1 << 1);
3516                 save_guest_segment_descriptor(vcpu, tss_selector,
3517                                               &nseg_desc);
3518         }
3519
3520         kvm_x86_ops->set_cr0(vcpu, vcpu->arch.cr0 | X86_CR0_TS);
3521         seg_desct_to_kvm_desct(&nseg_desc, tss_selector, &tr_seg);
3522         tr_seg.type = 11;
3523         set_segment(vcpu, &tr_seg, VCPU_SREG_TR);
3524 out:
3525         kvm_x86_ops->decache_regs(vcpu);
3526         return ret;
3527 }
3528 EXPORT_SYMBOL_GPL(kvm_task_switch);
3529
3530 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
3531                                   struct kvm_sregs *sregs)
3532 {
3533         int mmu_reset_needed = 0;
3534         int i, pending_vec, max_bits;
3535         struct descriptor_table dt;
3536
3537         vcpu_load(vcpu);
3538
3539         dt.limit = sregs->idt.limit;
3540         dt.base = sregs->idt.base;
3541         kvm_x86_ops->set_idt(vcpu, &dt);
3542         dt.limit = sregs->gdt.limit;
3543         dt.base = sregs->gdt.base;
3544         kvm_x86_ops->set_gdt(vcpu, &dt);
3545
3546         vcpu->arch.cr2 = sregs->cr2;
3547         mmu_reset_needed |= vcpu->arch.cr3 != sregs->cr3;
3548         vcpu->arch.cr3 = sregs->cr3;
3549
3550         kvm_set_cr8(vcpu, sregs->cr8);
3551
3552         mmu_reset_needed |= vcpu->arch.shadow_efer != sregs->efer;
3553         kvm_x86_ops->set_efer(vcpu, sregs->efer);
3554         kvm_set_apic_base(vcpu, sregs->apic_base);
3555
3556         kvm_x86_ops->decache_cr4_guest_bits(vcpu);
3557
3558         mmu_reset_needed |= vcpu->arch.cr0 != sregs->cr0;
3559         kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
3560         vcpu->arch.cr0 = sregs->cr0;
3561
3562         mmu_reset_needed |= vcpu->arch.cr4 != sregs->cr4;
3563         kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
3564         if (!is_long_mode(vcpu) && is_pae(vcpu))
3565                 load_pdptrs(vcpu, vcpu->arch.cr3);
3566
3567         if (mmu_reset_needed)
3568                 kvm_mmu_reset_context(vcpu);
3569
3570         if (!irqchip_in_kernel(vcpu->kvm)) {
3571                 memcpy(vcpu->arch.irq_pending, sregs->interrupt_bitmap,
3572                        sizeof vcpu->arch.irq_pending);
3573                 vcpu->arch.irq_summary = 0;
3574                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.irq_pending); ++i)
3575                         if (vcpu->arch.irq_pending[i])
3576                                 __set_bit(i, &vcpu->arch.irq_summary);
3577         } else {
3578                 max_bits = (sizeof sregs->interrupt_bitmap) << 3;
3579                 pending_vec = find_first_bit(
3580                         (const unsigned long *)sregs->interrupt_bitmap,
3581                         max_bits);
3582                 /* Only pending external irq is handled here */
3583                 if (pending_vec < max_bits) {
3584                         kvm_x86_ops->set_irq(vcpu, pending_vec);
3585                         pr_debug("Set back pending irq %d\n",
3586                                  pending_vec);
3587                 }
3588         }
3589
3590         set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
3591         set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
3592         set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
3593         set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
3594         set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
3595         set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
3596
3597         set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
3598         set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
3599
3600         vcpu_put(vcpu);
3601
3602         return 0;
3603 }
3604
3605 int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
3606                                     struct kvm_debug_guest *dbg)
3607 {
3608         int r;
3609
3610         vcpu_load(vcpu);
3611
3612         r = kvm_x86_ops->set_guest_debug(vcpu, dbg);
3613
3614         vcpu_put(vcpu);
3615
3616         return r;
3617 }
3618
3619 /*
3620  * fxsave fpu state.  Taken from x86_64/processor.h.  To be killed when
3621  * we have asm/x86/processor.h
3622  */
3623 struct fxsave {
3624         u16     cwd;
3625         u16     swd;
3626         u16     twd;
3627         u16     fop;
3628         u64     rip;
3629         u64     rdp;
3630         u32     mxcsr;
3631         u32     mxcsr_mask;
3632         u32     st_space[32];   /* 8*16 bytes for each FP-reg = 128 bytes */
3633 #ifdef CONFIG_X86_64
3634         u32     xmm_space[64];  /* 16*16 bytes for each XMM-reg = 256 bytes */
3635 #else
3636         u32     xmm_space[32];  /* 8*16 bytes for each XMM-reg = 128 bytes */
3637 #endif
3638 };
3639
3640 /*
3641  * Translate a guest virtual address to a guest physical address.
3642  */
3643 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
3644                                     struct kvm_translation *tr)
3645 {
3646         unsigned long vaddr = tr->linear_address;
3647         gpa_t gpa;
3648
3649         vcpu_load(vcpu);
3650         down_read(&vcpu->kvm->slots_lock);
3651         gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, vaddr);
3652         up_read(&vcpu->kvm->slots_lock);
3653         tr->physical_address = gpa;
3654         tr->valid = gpa != UNMAPPED_GVA;
3655         tr->writeable = 1;
3656         tr->usermode = 0;
3657         vcpu_put(vcpu);
3658
3659         return 0;
3660 }
3661
3662 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
3663 {
3664         struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
3665
3666         vcpu_load(vcpu);
3667
3668         memcpy(fpu->fpr, fxsave->st_space, 128);
3669         fpu->fcw = fxsave->cwd;
3670         fpu->fsw = fxsave->swd;
3671         fpu->ftwx = fxsave->twd;
3672         fpu->last_opcode = fxsave->fop;
3673         fpu->last_ip = fxsave->rip;
3674         fpu->last_dp = fxsave->rdp;
3675         memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
3676
3677         vcpu_put(vcpu);
3678
3679         return 0;
3680 }
3681
3682 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
3683 {
3684         struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
3685
3686         vcpu_load(vcpu);
3687
3688         memcpy(fxsave->st_space, fpu->fpr, 128);
3689         fxsave->cwd = fpu->fcw;
3690         fxsave->swd = fpu->fsw;
3691         fxsave->twd = fpu->ftwx;
3692         fxsave->fop = fpu->last_opcode;
3693         fxsave->rip = fpu->last_ip;
3694         fxsave->rdp = fpu->last_dp;
3695         memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
3696
3697         vcpu_put(vcpu);
3698
3699         return 0;
3700 }
3701
3702 void fx_init(struct kvm_vcpu *vcpu)
3703 {
3704         unsigned after_mxcsr_mask;
3705
3706         /*
3707          * Touch the fpu the first time in non atomic context as if
3708          * this is the first fpu instruction the exception handler
3709          * will fire before the instruction returns and it'll have to
3710          * allocate ram with GFP_KERNEL.
3711          */
3712         if (!used_math())
3713                 fx_save(&vcpu->arch.host_fx_image);
3714
3715         /* Initialize guest FPU by resetting ours and saving into guest's */
3716         preempt_disable();
3717         fx_save(&vcpu->arch.host_fx_image);
3718         fx_finit();
3719         fx_save(&vcpu->arch.guest_fx_image);
3720         fx_restore(&vcpu->arch.host_fx_image);
3721         preempt_enable();
3722
3723         vcpu->arch.cr0 |= X86_CR0_ET;
3724         after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
3725         vcpu->arch.guest_fx_image.mxcsr = 0x1f80;
3726         memset((void *)&vcpu->arch.guest_fx_image + after_mxcsr_mask,
3727                0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
3728 }
3729 EXPORT_SYMBOL_GPL(fx_init);
3730
3731 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
3732 {
3733         if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
3734                 return;
3735
3736         vcpu->guest_fpu_loaded = 1;
3737         fx_save(&vcpu->arch.host_fx_image);
3738         fx_restore(&vcpu->arch.guest_fx_image);
3739 }
3740 EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
3741
3742 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
3743 {
3744         if (!vcpu->guest_fpu_loaded)
3745                 return;
3746
3747         vcpu->guest_fpu_loaded = 0;
3748         fx_save(&vcpu->arch.guest_fx_image);
3749         fx_restore(&vcpu->arch.host_fx_image);
3750         ++vcpu->stat.fpu_reload;
3751 }
3752 EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
3753
3754 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
3755 {
3756         kvm_x86_ops->vcpu_free(vcpu);
3757 }
3758
3759 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
3760                                                 unsigned int id)
3761 {
3762         return kvm_x86_ops->vcpu_create(kvm, id);
3763 }
3764
3765 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
3766 {
3767         int r;
3768
3769         /* We do fxsave: this must be aligned. */
3770         BUG_ON((unsigned long)&vcpu->arch.host_fx_image & 0xF);
3771
3772         vcpu_load(vcpu);
3773         r = kvm_arch_vcpu_reset(vcpu);
3774         if (r == 0)
3775                 r = kvm_mmu_setup(vcpu);
3776         vcpu_put(vcpu);
3777         if (r < 0)
3778                 goto free_vcpu;
3779
3780         return 0;
3781 free_vcpu:
3782         kvm_x86_ops->vcpu_free(vcpu);
3783         return r;
3784 }
3785
3786 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
3787 {
3788         vcpu_load(vcpu);
3789         kvm_mmu_unload(vcpu);
3790         vcpu_put(vcpu);
3791
3792         kvm_x86_ops->vcpu_free(vcpu);
3793 }
3794
3795 int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
3796 {
3797         return kvm_x86_ops->vcpu_reset(vcpu);
3798 }
3799
3800 void kvm_arch_hardware_enable(void *garbage)
3801 {
3802         kvm_x86_ops->hardware_enable(garbage);
3803 }
3804
3805 void kvm_arch_hardware_disable(void *garbage)
3806 {
3807         kvm_x86_ops->hardware_disable(garbage);
3808 }
3809
3810 int kvm_arch_hardware_setup(void)
3811 {
3812         return kvm_x86_ops->hardware_setup();
3813 }
3814
3815 void kvm_arch_hardware_unsetup(void)
3816 {
3817         kvm_x86_ops->hardware_unsetup();
3818 }
3819
3820 void kvm_arch_check_processor_compat(void *rtn)
3821 {
3822         kvm_x86_ops->check_processor_compatibility(rtn);
3823 }
3824
3825 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
3826 {
3827         struct page *page;
3828         struct kvm *kvm;
3829         int r;
3830
3831         BUG_ON(vcpu->kvm == NULL);
3832         kvm = vcpu->kvm;
3833
3834         vcpu->arch.mmu.root_hpa = INVALID_PAGE;
3835         if (!irqchip_in_kernel(kvm) || vcpu->vcpu_id == 0)
3836                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
3837         else
3838                 vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
3839
3840         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3841         if (!page) {
3842                 r = -ENOMEM;
3843                 goto fail;
3844         }
3845         vcpu->arch.pio_data = page_address(page);
3846
3847         r = kvm_mmu_create(vcpu);
3848         if (r < 0)
3849                 goto fail_free_pio_data;
3850
3851         if (irqchip_in_kernel(kvm)) {
3852                 r = kvm_create_lapic(vcpu);
3853                 if (r < 0)
3854                         goto fail_mmu_destroy;
3855         }
3856
3857         return 0;
3858
3859 fail_mmu_destroy:
3860         kvm_mmu_destroy(vcpu);
3861 fail_free_pio_data:
3862         free_page((unsigned long)vcpu->arch.pio_data);
3863 fail:
3864         return r;
3865 }
3866
3867 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
3868 {
3869         kvm_free_lapic(vcpu);
3870         down_read(&vcpu->kvm->slots_lock);
3871         kvm_mmu_destroy(vcpu);
3872         up_read(&vcpu->kvm->slots_lock);
3873         free_page((unsigned long)vcpu->arch.pio_data);
3874 }
3875
3876 struct  kvm *kvm_arch_create_vm(void)
3877 {
3878         struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
3879
3880         if (!kvm)
3881                 return ERR_PTR(-ENOMEM);
3882
3883         INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
3884
3885         return kvm;
3886 }
3887
3888 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
3889 {
3890         vcpu_load(vcpu);
3891         kvm_mmu_unload(vcpu);
3892         vcpu_put(vcpu);
3893 }
3894
3895 static void kvm_free_vcpus(struct kvm *kvm)
3896 {
3897         unsigned int i;
3898
3899         /*
3900          * Unpin any mmu pages first.
3901          */
3902         for (i = 0; i < KVM_MAX_VCPUS; ++i)
3903                 if (kvm->vcpus[i])
3904                         kvm_unload_vcpu_mmu(kvm->vcpus[i]);
3905         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
3906                 if (kvm->vcpus[i]) {
3907                         kvm_arch_vcpu_free(kvm->vcpus[i]);
3908                         kvm->vcpus[i] = NULL;
3909                 }
3910         }
3911
3912 }
3913
3914 void kvm_arch_destroy_vm(struct kvm *kvm)
3915 {
3916         kvm_free_pit(kvm);
3917         kfree(kvm->arch.vpic);
3918         kfree(kvm->arch.vioapic);
3919         kvm_free_vcpus(kvm);
3920         kvm_free_physmem(kvm);
3921         if (kvm->arch.apic_access_page)
3922                 put_page(kvm->arch.apic_access_page);
3923         if (kvm->arch.ept_identity_pagetable)
3924                 put_page(kvm->arch.ept_identity_pagetable);
3925         kfree(kvm);
3926 }
3927
3928 int kvm_arch_set_memory_region(struct kvm *kvm,
3929                                 struct kvm_userspace_memory_region *mem,
3930                                 struct kvm_memory_slot old,
3931                                 int user_alloc)
3932 {
3933         int npages = mem->memory_size >> PAGE_SHIFT;
3934         struct kvm_memory_slot *memslot = &kvm->memslots[mem->slot];
3935
3936         /*To keep backward compatibility with older userspace,
3937          *x86 needs to hanlde !user_alloc case.
3938          */
3939         if (!user_alloc) {
3940                 if (npages && !old.rmap) {
3941                         down_write(&current->mm->mmap_sem);
3942                         memslot->userspace_addr = do_mmap(NULL, 0,
3943                                                      npages * PAGE_SIZE,
3944                                                      PROT_READ | PROT_WRITE,
3945                                                      MAP_SHARED | MAP_ANONYMOUS,
3946                                                      0);
3947                         up_write(&current->mm->mmap_sem);
3948
3949                         if (IS_ERR((void *)memslot->userspace_addr))
3950                                 return PTR_ERR((void *)memslot->userspace_addr);
3951                 } else {
3952                         if (!old.user_alloc && old.rmap) {
3953                                 int ret;
3954
3955                                 down_write(&current->mm->mmap_sem);
3956                                 ret = do_munmap(current->mm, old.userspace_addr,
3957                                                 old.npages * PAGE_SIZE);
3958                                 up_write(&current->mm->mmap_sem);
3959                                 if (ret < 0)
3960                                         printk(KERN_WARNING
3961                                        "kvm_vm_ioctl_set_memory_region: "
3962                                        "failed to munmap memory\n");
3963                         }
3964                 }
3965         }
3966
3967         if (!kvm->arch.n_requested_mmu_pages) {
3968                 unsigned int nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
3969                 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
3970         }
3971
3972         kvm_mmu_slot_remove_write_access(kvm, mem->slot);
3973         kvm_flush_remote_tlbs(kvm);
3974
3975         return 0;
3976 }
3977
3978 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
3979 {
3980         return vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE
3981                || vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED;
3982 }
3983
3984 static void vcpu_kick_intr(void *info)
3985 {
3986 #ifdef DEBUG
3987         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)info;
3988         printk(KERN_DEBUG "vcpu_kick_intr %p \n", vcpu);
3989 #endif
3990 }
3991
3992 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
3993 {
3994         int ipi_pcpu = vcpu->cpu;
3995         int cpu = get_cpu();
3996
3997         if (waitqueue_active(&vcpu->wq)) {
3998                 wake_up_interruptible(&vcpu->wq);
3999                 ++vcpu->stat.halt_wakeup;
4000         }
4001         /*
4002          * We may be called synchronously with irqs disabled in guest mode,
4003          * So need not to call smp_call_function_single() in that case.
4004          */
4005         if (vcpu->guest_mode && vcpu->cpu != cpu)
4006                 smp_call_function_single(ipi_pcpu, vcpu_kick_intr, vcpu, 0, 0);
4007         put_cpu();
4008 }