arch/x86/kvm/lapic.c

   1
   2 /*
   3  * Local APIC virtualization
   4  *
   5  * Copyright (C) 2006 Qumranet, Inc.
   6  * Copyright (C) 2007 Novell
   7  * Copyright (C) 2007 Intel
   8  * Copyright 2009 Red Hat, Inc. and/or its affiliates.
   9  *
  10  * Authors:
  11  *   Dor Laor <dor.laor@qumranet.com>
  12  *   Gregory Haskins <ghaskins@novell.com>
  13  *   Yaozu (Eddie) Dong <eddie.dong@intel.com>
  14  *
  15  * Based on Xen 3.1 code, Copyright (c) 2004, Intel Corporation.
  16  *
  17  * This work is licensed under the terms of the GNU GPL, version 2.  See
  18  * the COPYING file in the top-level directory.
  19  */
  20
  21 #include <linux/kvm_host.h>
  22 #include <linux/kvm.h>
  23 #include <linux/mm.h>
  24 #include <linux/highmem.h>
  25 #include <linux/smp.h>
  26 #include <linux/hrtimer.h>
  27 #include <linux/io.h>
  28 #include <linux/module.h>
  29 #include <linux/math64.h>
  30 #include <linux/slab.h>
  31 #include <asm/processor.h>
  32 #include <asm/msr.h>
  33 #include <asm/page.h>
  34 #include <asm/current.h>
  35 #include <asm/apicdef.h>
  36 #include <linux/atomic.h>
  37 #include <linux/jump_label.h>
  38 #include "kvm_cache_regs.h"
  39 #include "irq.h"
  40 #include "trace.h"
  41 #include "x86.h"
  42 #include "cpuid.h"
  43
  44 #ifndef CONFIG_X86_64
  45 #define mod_64(x, y) ((x) - (y) * div64_u64(x, y))
  46 #else
  47 #define mod_64(x, y) ((x) % (y))
  48 #endif
  49
  50 #define PRId64 "d"
  51 #define PRIx64 "llx"
  52 #define PRIu64 "u"
  53 #define PRIo64 "o"
  54
  55 #define APIC_BUS_CYCLE_NS 1
  56
  57 /* #define apic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) */
  58 #define apic_debug(fmt, arg...)
  59
  60 #define APIC_LVT_NUM                    6
  61 /* 14 is the version for Xeon and Pentium 8.4.8*/
  62 #define APIC_VERSION                    (0x14UL | ((APIC_LVT_NUM - 1) << 16))
  63 #define LAPIC_MMIO_LENGTH               (1 << 12)
  64 /* followed define is not in apicdef.h */
  65 #define APIC_SHORT_MASK                 0xc0000
  66 #define APIC_DEST_NOSHORT               0x0
  67 #define APIC_DEST_MASK                  0x800
  68 #define MAX_APIC_VECTOR                 256
  69 #define APIC_VECTORS_PER_REG            32
  70
  71 #define VEC_POS(v) ((v) & (32 - 1))
  72 #define REG_POS(v) (((v) >> 5) << 4)
  73
  74 static unsigned int min_timer_period_us = 500;
  75 module_param(min_timer_period_us, uint, S_IRUGO | S_IWUSR);
  76
  77 static inline void apic_set_reg(struct kvm_lapic *apic, int reg_off, u32 val)
  78 {
  79         *((u32 *) (apic->regs + reg_off)) = val;
  80 }
  81
  82 static inline int apic_test_vector(int vec, void *bitmap)
  83 {
  84         return test_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  85 }
  86
  87 bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector)
  88 {
  89         struct kvm_lapic *apic = vcpu->arch.apic;
  90
  91         return apic_test_vector(vector, apic->regs + APIC_ISR) ||
  92                 apic_test_vector(vector, apic->regs + APIC_IRR);
  93 }
  94
  95 static inline void apic_set_vector(int vec, void *bitmap)
  96 {
  97         set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  98 }
  99
 100 static inline void apic_clear_vector(int vec, void *bitmap)
 101 {
 102         clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
 103 }
 104
 105 static inline int __apic_test_and_set_vector(int vec, void *bitmap)
 106 {
 107         return __test_and_set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
 108 }
 109
 110 static inline int __apic_test_and_clear_vector(int vec, void *bitmap)
 111 {
 112         return __test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
 113 }
 114
 115 struct static_key_deferred apic_hw_disabled __read_mostly;
 116 struct static_key_deferred apic_sw_disabled __read_mostly;
 117
 118 static inline void apic_set_spiv(struct kvm_lapic *apic, u32 val)
 119 {
 120         if ((kvm_apic_get_reg(apic, APIC_SPIV) ^ val) & APIC_SPIV_APIC_ENABLED) {
 121                 if (val & APIC_SPIV_APIC_ENABLED)
 122                         static_key_slow_dec_deferred(&apic_sw_disabled);
 123                 else
 124                         static_key_slow_inc(&apic_sw_disabled.key);
 125         }
 126         apic_set_reg(apic, APIC_SPIV, val);
 127 }
 128
 129 static inline int apic_enabled(struct kvm_lapic *apic)
 130 {
 131         return kvm_apic_sw_enabled(apic) &&     kvm_apic_hw_enabled(apic);
 132 }
 133
 134 #define LVT_MASK        \
 135         (APIC_LVT_MASKED | APIC_SEND_PENDING | APIC_VECTOR_MASK)
 136
 137 #define LINT_MASK       \
 138         (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
 139          APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
 140
 141 static inline int kvm_apic_id(struct kvm_lapic *apic)
 142 {
 143         return (kvm_apic_get_reg(apic, APIC_ID) >> 24) & 0xff;
 144 }
 145
 146 #define KVM_X2APIC_CID_BITS 0
 147
 148 static void recalculate_apic_map(struct kvm *kvm)
 149 {
 150         struct kvm_apic_map *new, *old = NULL;
 151         struct kvm_vcpu *vcpu;
 152         int i;
 153
 154         new = kzalloc(sizeof(struct kvm_apic_map), GFP_KERNEL);
 155
 156         mutex_lock(&kvm->arch.apic_map_lock);
 157
 158         if (!new)
 159                 goto out;
 160
 161         new->ldr_bits = 8;
 162         /* flat mode is default */
 163         new->cid_shift = 8;
 164         new->cid_mask = 0;
 165         new->lid_mask = 0xff;
 166
 167         kvm_for_each_vcpu(i, vcpu, kvm) {
 168                 struct kvm_lapic *apic = vcpu->arch.apic;
 169                 u16 cid, lid;
 170                 u32 ldr;
 171
 172                 if (!kvm_apic_present(vcpu))
 173                         continue;
 174
 175                 /*
 176                  * All APICs have to be configured in the same mode by an OS.
 177                  * We take advatage of this while building logical id loockup
 178                  * table. After reset APICs are in xapic/flat mode, so if we
 179                  * find apic with different setting we assume this is the mode
 180                  * OS wants all apics to be in; build lookup table accordingly.
 181                  */
 182                 if (apic_x2apic_mode(apic)) {
 183                         new->ldr_bits = 32;
 184                         new->cid_shift = 16;
 185                         new->cid_mask = (1 << KVM_X2APIC_CID_BITS) - 1;
 186                         new->lid_mask = 0xffff;
 187                 } else if (kvm_apic_sw_enabled(apic) &&
 188                                 !new->cid_mask /* flat mode */ &&
 189                                 kvm_apic_get_reg(apic, APIC_DFR) == APIC_DFR_CLUSTER) {
 190                         new->cid_shift = 4;
 191                         new->cid_mask = 0xf;
 192                         new->lid_mask = 0xf;
 193                 }
 194
 195                 new->phys_map[kvm_apic_id(apic)] = apic;
 196
 197                 ldr = kvm_apic_get_reg(apic, APIC_LDR);
 198                 cid = apic_cluster_id(new, ldr);
 199                 lid = apic_logical_id(new, ldr);
 200
 201                 if (lid)
 202                         new->logical_map[cid][ffs(lid) - 1] = apic;
 203         }
 204 out:
 205         old = rcu_dereference_protected(kvm->arch.apic_map,
 206                         lockdep_is_held(&kvm->arch.apic_map_lock));
 207         rcu_assign_pointer(kvm->arch.apic_map, new);
 208         mutex_unlock(&kvm->arch.apic_map_lock);
 209
 210         if (old)
 211                 kfree_rcu(old, rcu);
 212
 213         kvm_vcpu_request_scan_ioapic(kvm);
 214 }
 215
 216 static inline void kvm_apic_set_id(struct kvm_lapic *apic, u8 id)
 217 {
 218         apic_set_reg(apic, APIC_ID, id << 24);
 219         recalculate_apic_map(apic->vcpu->kvm);
 220 }
 221
 222 static inline void kvm_apic_set_ldr(struct kvm_lapic *apic, u32 id)
 223 {
 224         apic_set_reg(apic, APIC_LDR, id);
 225         recalculate_apic_map(apic->vcpu->kvm);
 226 }
 227
 228 static inline int apic_lvt_enabled(struct kvm_lapic *apic, int lvt_type)
 229 {
 230         return !(kvm_apic_get_reg(apic, lvt_type) & APIC_LVT_MASKED);
 231 }
 232
 233 static inline int apic_lvt_vector(struct kvm_lapic *apic, int lvt_type)
 234 {
 235         return kvm_apic_get_reg(apic, lvt_type) & APIC_VECTOR_MASK;
 236 }
 237
 238 static inline int apic_lvtt_oneshot(struct kvm_lapic *apic)
 239 {
 240         return ((kvm_apic_get_reg(apic, APIC_LVTT) &
 241                 apic->lapic_timer.timer_mode_mask) == APIC_LVT_TIMER_ONESHOT);
 242 }
 243
 244 static inline int apic_lvtt_period(struct kvm_lapic *apic)
 245 {
 246         return ((kvm_apic_get_reg(apic, APIC_LVTT) &
 247                 apic->lapic_timer.timer_mode_mask) == APIC_LVT_TIMER_PERIODIC);
 248 }
 249
 250 static inline int apic_lvtt_tscdeadline(struct kvm_lapic *apic)
 251 {
 252         return ((kvm_apic_get_reg(apic, APIC_LVTT) &
 253                 apic->lapic_timer.timer_mode_mask) ==
 254                         APIC_LVT_TIMER_TSCDEADLINE);
 255 }
 256
 257 static inline int apic_lvt_nmi_mode(u32 lvt_val)
 258 {
 259         return (lvt_val & (APIC_MODE_MASK | APIC_LVT_MASKED)) == APIC_DM_NMI;
 260 }
 261
 262 void kvm_apic_set_version(struct kvm_vcpu *vcpu)
 263 {
 264         struct kvm_lapic *apic = vcpu->arch.apic;
 265         struct kvm_cpuid_entry2 *feat;
 266         u32 v = APIC_VERSION;
 267
 268         if (!kvm_vcpu_has_lapic(vcpu))
 269                 return;
 270
 271         feat = kvm_find_cpuid_entry(apic->vcpu, 0x1, 0);
 272         if (feat && (feat->ecx & (1 << (X86_FEATURE_X2APIC & 31))))
 273                 v |= APIC_LVR_DIRECTED_EOI;
 274         apic_set_reg(apic, APIC_LVR, v);
 275 }
 276
 277 static const unsigned int apic_lvt_mask[APIC_LVT_NUM] = {
 278         LVT_MASK ,      /* part LVTT mask, timer mode mask added at runtime */
 279         LVT_MASK | APIC_MODE_MASK,      /* LVTTHMR */
 280         LVT_MASK | APIC_MODE_MASK,      /* LVTPC */
 281         LINT_MASK, LINT_MASK,   /* LVT0-1 */
 282         LVT_MASK                /* LVTERR */
 283 };
 284
 285 static int find_highest_vector(void *bitmap)
 286 {
 287         int vec;
 288         u32 *reg;
 289
 290         for (vec = MAX_APIC_VECTOR - APIC_VECTORS_PER_REG;
 291              vec >= 0; vec -= APIC_VECTORS_PER_REG) {
 292                 reg = bitmap + REG_POS(vec);
 293                 if (*reg)
 294                         return fls(*reg) - 1 + vec;
 295         }
 296
 297         return -1;
 298 }
 299
 300 static u8 count_vectors(void *bitmap)
 301 {
 302         int vec;
 303         u32 *reg;
 304         u8 count = 0;
 305
 306         for (vec = 0; vec < MAX_APIC_VECTOR; vec += APIC_VECTORS_PER_REG) {
 307                 reg = bitmap + REG_POS(vec);
 308                 count += hweight32(*reg);
 309         }
 310
 311         return count;
 312 }
 313
 314 void kvm_apic_update_irr(struct kvm_vcpu *vcpu, u32 *pir)
 315 {
 316         u32 i, pir_val;
 317         struct kvm_lapic *apic = vcpu->arch.apic;
 318
 319         for (i = 0; i <= 7; i++) {
 320                 pir_val = xchg(&pir[i], 0);
 321                 if (pir_val)
 322                         *((u32 *)(apic->regs + APIC_IRR + i * 0x10)) |= pir_val;
 323         }
 324 }
 325 EXPORT_SYMBOL_GPL(kvm_apic_update_irr);
 326
 327 static inline void apic_set_irr(int vec, struct kvm_lapic *apic)
 328 {
 329         apic->irr_pending = true;
 330         apic_set_vector(vec, apic->regs + APIC_IRR);
 331 }
 332
 333 static inline int apic_search_irr(struct kvm_lapic *apic)
 334 {
 335         return find_highest_vector(apic->regs + APIC_IRR);
 336 }
 337
 338 static inline int apic_find_highest_irr(struct kvm_lapic *apic)
 339 {
 340         int result;
 341
 342         /*
 343          * Note that irr_pending is just a hint. It will be always
 344          * true with virtual interrupt delivery enabled.
 345          */
 346         if (!apic->irr_pending)
 347                 return -1;
 348
 349         kvm_x86_ops->sync_pir_to_irr(apic->vcpu);
 350         result = apic_search_irr(apic);
 351         ASSERT(result == -1 || result >= 16);
 352
 353         return result;
 354 }
 355
 356 static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
 357 {
 358         apic->irr_pending = false;
 359         apic_clear_vector(vec, apic->regs + APIC_IRR);
 360         if (apic_search_irr(apic) != -1)
 361                 apic->irr_pending = true;
 362 }
 363
 364 static inline void apic_set_isr(int vec, struct kvm_lapic *apic)
 365 {
 366         if (!__apic_test_and_set_vector(vec, apic->regs + APIC_ISR))
 367                 ++apic->isr_count;
 368         BUG_ON(apic->isr_count > MAX_APIC_VECTOR);
 369         /*
 370          * ISR (in service register) bit is set when injecting an interrupt.
 371          * The highest vector is injected. Thus the latest bit set matches
 372          * the highest bit in ISR.
 373          */
 374         apic->highest_isr_cache = vec;
 375 }
 376
 377 static inline void apic_clear_isr(int vec, struct kvm_lapic *apic)
 378 {
 379         if (__apic_test_and_clear_vector(vec, apic->regs + APIC_ISR))
 380                 --apic->isr_count;
 381         BUG_ON(apic->isr_count < 0);
 382         apic->highest_isr_cache = -1;
 383 }
 384
 385 int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
 386 {
 387         int highest_irr;
 388
 389         /* This may race with setting of irr in __apic_accept_irq() and
 390          * value returned may be wrong, but kvm_vcpu_kick() in __apic_accept_irq
 391          * will cause vmexit immediately and the value will be recalculated
 392          * on the next vmentry.
 393          */
 394         if (!kvm_vcpu_has_lapic(vcpu))
 395                 return 0;
 396         highest_irr = apic_find_highest_irr(vcpu->arch.apic);
 397
 398         return highest_irr;
 399 }
 400
 401 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
 402                              int vector, int level, int trig_mode,
 403                              unsigned long *dest_map);
 404
 405 int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq,
 406                 unsigned long *dest_map)
 407 {
 408         struct kvm_lapic *apic = vcpu->arch.apic;
 409
 410         return __apic_accept_irq(apic, irq->delivery_mode, irq->vector,
 411                         irq->level, irq->trig_mode, dest_map);
 412 }
 413
 414 static int pv_eoi_put_user(struct kvm_vcpu *vcpu, u8 val)
 415 {
 416
 417         return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data, &val,
 418                                       sizeof(val));
 419 }
 420
 421 static int pv_eoi_get_user(struct kvm_vcpu *vcpu, u8 *val)
 422 {
 423
 424         return kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data, val,
 425                                       sizeof(*val));
 426 }
 427
 428 static inline bool pv_eoi_enabled(struct kvm_vcpu *vcpu)
 429 {
 430         return vcpu->arch.pv_eoi.msr_val & KVM_MSR_ENABLED;
 431 }
 432
 433 static bool pv_eoi_get_pending(struct kvm_vcpu *vcpu)
 434 {
 435         u8 val;
 436         if (pv_eoi_get_user(vcpu, &val) < 0)
 437                 apic_debug("Can't read EOI MSR value: 0x%llx\n",
 438                            (unsigned long long)vcpi->arch.pv_eoi.msr_val);
 439         return val & 0x1;
 440 }
 441
 442 static void pv_eoi_set_pending(struct kvm_vcpu *vcpu)
 443 {
 444         if (pv_eoi_put_user(vcpu, KVM_PV_EOI_ENABLED) < 0) {
 445                 apic_debug("Can't set EOI MSR value: 0x%llx\n",
 446                            (unsigned long long)vcpi->arch.pv_eoi.msr_val);
 447                 return;
 448         }
 449         __set_bit(KVM_APIC_PV_EOI_PENDING, &vcpu->arch.apic_attention);
 450 }
 451
 452 static void pv_eoi_clr_pending(struct kvm_vcpu *vcpu)
 453 {
 454         if (pv_eoi_put_user(vcpu, KVM_PV_EOI_DISABLED) < 0) {
 455                 apic_debug("Can't clear EOI MSR value: 0x%llx\n",
 456                            (unsigned long long)vcpi->arch.pv_eoi.msr_val);
 457                 return;
 458         }
 459         __clear_bit(KVM_APIC_PV_EOI_PENDING, &vcpu->arch.apic_attention);
 460 }
 461
 462 static inline int apic_find_highest_isr(struct kvm_lapic *apic)
 463 {
 464         int result;
 465
 466         /* Note that isr_count is always 1 with vid enabled */
 467         if (!apic->isr_count)
 468                 return -1;
 469         if (likely(apic->highest_isr_cache != -1))
 470                 return apic->highest_isr_cache;
 471
 472         result = find_highest_vector(apic->regs + APIC_ISR);
 473         ASSERT(result == -1 || result >= 16);
 474
 475         return result;
 476 }
 477
 478 void kvm_apic_update_tmr(struct kvm_vcpu *vcpu, u32 *tmr)
 479 {
 480         struct kvm_lapic *apic = vcpu->arch.apic;
 481         int i;
 482
 483         for (i = 0; i < 8; i++)
 484                 apic_set_reg(apic, APIC_TMR + 0x10 * i, tmr[i]);
 485 }
 486
 487 static void apic_update_ppr(struct kvm_lapic *apic)
 488 {
 489         u32 tpr, isrv, ppr, old_ppr;
 490         int isr;
 491
 492         old_ppr = kvm_apic_get_reg(apic, APIC_PROCPRI);
 493         tpr = kvm_apic_get_reg(apic, APIC_TASKPRI);
 494         isr = apic_find_highest_isr(apic);
 495         isrv = (isr != -1) ? isr : 0;
 496
 497         if ((tpr & 0xf0) >= (isrv & 0xf0))
 498                 ppr = tpr & 0xff;
 499         else
 500                 ppr = isrv & 0xf0;
 501
 502         apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x",
 503                    apic, ppr, isr, isrv);
 504
 505         if (old_ppr != ppr) {
 506                 apic_set_reg(apic, APIC_PROCPRI, ppr);
 507                 if (ppr < old_ppr)
 508                         kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
 509         }
 510 }
 511
 512 static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
 513 {
 514         apic_set_reg(apic, APIC_TASKPRI, tpr);
 515         apic_update_ppr(apic);
 516 }
 517
 518 int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest)
 519 {
 520         return dest == 0xff || kvm_apic_id(apic) == dest;
 521 }
 522
 523 int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda)
 524 {
 525         int result = 0;
 526         u32 logical_id;
 527
 528         if (apic_x2apic_mode(apic)) {
 529                 logical_id = kvm_apic_get_reg(apic, APIC_LDR);
 530                 return logical_id & mda;
 531         }
 532
 533         logical_id = GET_APIC_LOGICAL_ID(kvm_apic_get_reg(apic, APIC_LDR));
 534
 535         switch (kvm_apic_get_reg(apic, APIC_DFR)) {
 536         case APIC_DFR_FLAT:
 537                 if (logical_id & mda)
 538                         result = 1;
 539                 break;
 540         case APIC_DFR_CLUSTER:
 541                 if (((logical_id >> 4) == (mda >> 0x4))
 542                     && (logical_id & mda & 0xf))
 543                         result = 1;
 544                 break;
 545         default:
 546                 apic_debug("Bad DFR vcpu %d: %08x\n",
 547                            apic->vcpu->vcpu_id, kvm_apic_get_reg(apic, APIC_DFR));
 548                 break;
 549         }
 550
 551         return result;
 552 }
 553
 554 int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
 555                            int short_hand, int dest, int dest_mode)
 556 {
 557         int result = 0;
 558         struct kvm_lapic *target = vcpu->arch.apic;
 559
 560         apic_debug("target %p, source %p, dest 0x%x, "
 561                    "dest_mode 0x%x, short_hand 0x%x\n",
 562                    target, source, dest, dest_mode, short_hand);
 563
 564         ASSERT(target);
 565         switch (short_hand) {
 566         case APIC_DEST_NOSHORT:
 567                 if (dest_mode == 0)
 568                         /* Physical mode. */
 569                         result = kvm_apic_match_physical_addr(target, dest);
 570                 else
 571                         /* Logical mode. */
 572                         result = kvm_apic_match_logical_addr(target, dest);
 573                 break;
 574         case APIC_DEST_SELF:
 575                 result = (target == source);
 576                 break;
 577         case APIC_DEST_ALLINC:
 578                 result = 1;
 579                 break;
 580         case APIC_DEST_ALLBUT:
 581                 result = (target != source);
 582                 break;
 583         default:
 584                 apic_debug("kvm: apic: Bad dest shorthand value %x\n",
 585                            short_hand);
 586                 break;
 587         }
 588
 589         return result;
 590 }
 591
 592 bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
 593                 struct kvm_lapic_irq *irq, int *r, unsigned long *dest_map)
 594 {
 595         struct kvm_apic_map *map;
 596         unsigned long bitmap = 1;
 597         struct kvm_lapic **dst;
 598         int i;
 599         bool ret = false;
 600
 601         *r = -1;
 602
 603         if (irq->shorthand == APIC_DEST_SELF) {
 604                 *r = kvm_apic_set_irq(src->vcpu, irq, dest_map);
 605                 return true;
 606         }
 607
 608         if (irq->shorthand)
 609                 return false;
 610
 611         rcu_read_lock();
 612         map = rcu_dereference(kvm->arch.apic_map);
 613
 614         if (!map)
 615                 goto out;
 616
 617         if (irq->dest_mode == 0) { /* physical mode */
 618                 if (irq->delivery_mode == APIC_DM_LOWEST ||
 619                                 irq->dest_id == 0xff)
 620                         goto out;
 621                 dst = &map->phys_map[irq->dest_id & 0xff];
 622         } else {
 623                 u32 mda = irq->dest_id << (32 - map->ldr_bits);
 624
 625                 dst = map->logical_map[apic_cluster_id(map, mda)];
 626
 627                 bitmap = apic_logical_id(map, mda);
 628
 629                 if (irq->delivery_mode == APIC_DM_LOWEST) {
 630                         int l = -1;
 631                         for_each_set_bit(i, &bitmap, 16) {
 632                                 if (!dst[i])
 633                                         continue;
 634                                 if (l < 0)
 635                                         l = i;
 636                                 else if (kvm_apic_compare_prio(dst[i]->vcpu, dst[l]->vcpu) < 0)
 637                                         l = i;
 638                         }
 639
 640                         bitmap = (l >= 0) ? 1 << l : 0;
 641                 }
 642         }
 643
 644         for_each_set_bit(i, &bitmap, 16) {
 645                 if (!dst[i])
 646                         continue;
 647                 if (*r < 0)
 648                         *r = 0;
 649                 *r += kvm_apic_set_irq(dst[i]->vcpu, irq, dest_map);
 650         }
 651
 652         ret = true;
 653 out:
 654         rcu_read_unlock();
 655         return ret;
 656 }
 657
 658 /*
 659  * Add a pending IRQ into lapic.
 660  * Return 1 if successfully added and 0 if discarded.
 661  */
 662 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
 663                              int vector, int level, int trig_mode,
 664                              unsigned long *dest_map)
 665 {
 666         int result = 0;
 667         struct kvm_vcpu *vcpu = apic->vcpu;
 668
 669         switch (delivery_mode) {
 670         case APIC_DM_LOWEST:
 671                 vcpu->arch.apic_arb_prio++;
 672         case APIC_DM_FIXED:
 673                 /* FIXME add logic for vcpu on reset */
 674                 if (unlikely(!apic_enabled(apic)))
 675                         break;
 676
 677                 result = 1;
 678
 679                 if (dest_map)
 680                         __set_bit(vcpu->vcpu_id, dest_map);
 681
 682                 if (kvm_x86_ops->deliver_posted_interrupt)
 683                         kvm_x86_ops->deliver_posted_interrupt(vcpu, vector);
 684                 else {
 685                         apic_set_irr(vector, apic);
 686
 687                         kvm_make_request(KVM_REQ_EVENT, vcpu);
 688                         kvm_vcpu_kick(vcpu);
 689                 }
 690                 trace_kvm_apic_accept_irq(vcpu->vcpu_id, delivery_mode,
 691                                           trig_mode, vector, false);
 692                 break;
 693
 694         case APIC_DM_REMRD:
 695                 result = 1;
 696                 vcpu->arch.pv.pv_unhalted = 1;
 697                 kvm_make_request(KVM_REQ_EVENT, vcpu);
 698                 kvm_vcpu_kick(vcpu);
 699                 break;
 700
 701         case APIC_DM_SMI:
 702                 apic_debug("Ignoring guest SMI\n");
 703                 break;
 704
 705         case APIC_DM_NMI:
 706                 result = 1;
 707                 kvm_inject_nmi(vcpu);
 708                 kvm_vcpu_kick(vcpu);
 709                 break;
 710
 711         case APIC_DM_INIT:
 712                 if (!trig_mode || level) {
 713                         result = 1;
 714                         /* assumes that there are only KVM_APIC_INIT/SIPI */
 715                         apic->pending_events = (1UL << KVM_APIC_INIT);
 716                         /* make sure pending_events is visible before sending
 717                          * the request */
 718                         smp_wmb();
 719                         kvm_make_request(KVM_REQ_EVENT, vcpu);
 720                         kvm_vcpu_kick(vcpu);
 721                 } else {
 722                         apic_debug("Ignoring de-assert INIT to vcpu %d\n",
 723                                    vcpu->vcpu_id);
 724                 }
 725                 break;
 726
 727         case APIC_DM_STARTUP:
 728                 apic_debug("SIPI to vcpu %d vector 0x%02x\n",
 729                            vcpu->vcpu_id, vector);
 730                 result = 1;
 731                 apic->sipi_vector = vector;
 732                 /* make sure sipi_vector is visible for the receiver */
 733                 smp_wmb();
 734                 set_bit(KVM_APIC_SIPI, &apic->pending_events);
 735                 kvm_make_request(KVM_REQ_EVENT, vcpu);
 736                 kvm_vcpu_kick(vcpu);
 737                 break;
 738
 739         case APIC_DM_EXTINT:
 740                 /*
 741                  * Should only be called by kvm_apic_local_deliver() with LVT0,
 742                  * before NMI watchdog was enabled. Already handled by
 743                  * kvm_apic_accept_pic_intr().
 744                  */
 745                 break;
 746
 747         default:
 748                 printk(KERN_ERR "TODO: unsupported delivery mode %x\n",
 749                        delivery_mode);
 750                 break;
 751         }
 752         return result;
 753 }
 754
 755 int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2)
 756 {
 757         return vcpu1->arch.apic_arb_prio - vcpu2->arch.apic_arb_prio;
 758 }
 759
 760 static void kvm_ioapic_send_eoi(struct kvm_lapic *apic, int vector)
 761 {
 762         if (!(kvm_apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_DIRECTED_EOI) &&
 763             kvm_ioapic_handles_vector(apic->vcpu->kvm, vector)) {
 764                 int trigger_mode;
 765                 if (apic_test_vector(vector, apic->regs + APIC_TMR))
 766                         trigger_mode = IOAPIC_LEVEL_TRIG;
 767                 else
 768                         trigger_mode = IOAPIC_EDGE_TRIG;
 769                 kvm_ioapic_update_eoi(apic->vcpu, vector, trigger_mode);
 770         }
 771 }
 772
 773 static int apic_set_eoi(struct kvm_lapic *apic)
 774 {
 775         int vector = apic_find_highest_isr(apic);
 776
 777         trace_kvm_eoi(apic, vector);
 778
 779         /*
 780          * Not every write EOI will has corresponding ISR,
 781          * one example is when Kernel check timer on setup_IO_APIC
 782          */
 783         if (vector == -1)
 784                 return vector;
 785
 786         apic_clear_isr(vector, apic);
 787         apic_update_ppr(apic);
 788
 789         kvm_ioapic_send_eoi(apic, vector);
 790         kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
 791         return vector;
 792 }
 793
 794 /*
 795  * this interface assumes a trap-like exit, which has already finished
 796  * desired side effect including vISR and vPPR update.
 797  */
 798 void kvm_apic_set_eoi_accelerated(struct kvm_vcpu *vcpu, int vector)
 799 {
 800         struct kvm_lapic *apic = vcpu->arch.apic;
 801
 802         trace_kvm_eoi(apic, vector);
 803
 804         kvm_ioapic_send_eoi(apic, vector);
 805         kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
 806 }
 807 EXPORT_SYMBOL_GPL(kvm_apic_set_eoi_accelerated);
 808
 809 static void apic_send_ipi(struct kvm_lapic *apic)
 810 {
 811         u32 icr_low = kvm_apic_get_reg(apic, APIC_ICR);
 812         u32 icr_high = kvm_apic_get_reg(apic, APIC_ICR2);
 813         struct kvm_lapic_irq irq;
 814
 815         irq.vector = icr_low & APIC_VECTOR_MASK;
 816         irq.delivery_mode = icr_low & APIC_MODE_MASK;
 817         irq.dest_mode = icr_low & APIC_DEST_MASK;
 818         irq.level = icr_low & APIC_INT_ASSERT;
 819         irq.trig_mode = icr_low & APIC_INT_LEVELTRIG;
 820         irq.shorthand = icr_low & APIC_SHORT_MASK;
 821         if (apic_x2apic_mode(apic))
 822                 irq.dest_id = icr_high;
 823         else
 824                 irq.dest_id = GET_APIC_DEST_FIELD(icr_high);
 825
 826         trace_kvm_apic_ipi(icr_low, irq.dest_id);
 827
 828         apic_debug("icr_high 0x%x, icr_low 0x%x, "
 829                    "short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
 830                    "dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x\n",
 831                    icr_high, icr_low, irq.shorthand, irq.dest_id,
 832                    irq.trig_mode, irq.level, irq.dest_mode, irq.delivery_mode,
 833                    irq.vector);
 834
 835         kvm_irq_delivery_to_apic(apic->vcpu->kvm, apic, &irq, NULL);
 836 }
 837
 838 static u32 apic_get_tmcct(struct kvm_lapic *apic)
 839 {
 840         ktime_t remaining;
 841         s64 ns;
 842         u32 tmcct;
 843
 844         ASSERT(apic != NULL);
 845
 846         /* if initial count is 0, current count should also be 0 */
 847         if (kvm_apic_get_reg(apic, APIC_TMICT) == 0 ||
 848                 apic->lapic_timer.period == 0)
 849                 return 0;
 850
 851         remaining = hrtimer_get_remaining(&apic->lapic_timer.timer);
 852         if (ktime_to_ns(remaining) < 0)
 853                 remaining = ktime_set(0, 0);
 854
 855         ns = mod_64(ktime_to_ns(remaining), apic->lapic_timer.period);
 856         tmcct = div64_u64(ns,
 857                          (APIC_BUS_CYCLE_NS * apic->divide_count));
 858
 859         return tmcct;
 860 }
 861
 862 static void __report_tpr_access(struct kvm_lapic *apic, bool write)
 863 {
 864         struct kvm_vcpu *vcpu = apic->vcpu;
 865         struct kvm_run *run = vcpu->run;
 866
 867         kvm_make_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu);
 868         run->tpr_access.rip = kvm_rip_read(vcpu);
 869         run->tpr_access.is_write = write;
 870 }
 871
 872 static inline void report_tpr_access(struct kvm_lapic *apic, bool write)
 873 {
 874         if (apic->vcpu->arch.tpr_access_reporting)
 875                 __report_tpr_access(apic, write);
 876 }
 877
 878 static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset)
 879 {
 880         u32 val = 0;
 881
 882         if (offset >= LAPIC_MMIO_LENGTH)
 883                 return 0;
 884
 885         switch (offset) {
 886         case APIC_ID:
 887                 if (apic_x2apic_mode(apic))
 888                         val = kvm_apic_id(apic);
 889                 else
 890                         val = kvm_apic_id(apic) << 24;
 891                 break;
 892         case APIC_ARBPRI:
 893                 apic_debug("Access APIC ARBPRI register which is for P6\n");
 894                 break;
 895
 896         case APIC_TMCCT:        /* Timer CCR */
 897                 if (apic_lvtt_tscdeadline(apic))
 898                         return 0;
 899
 900                 val = apic_get_tmcct(apic);
 901                 break;
 902         case APIC_PROCPRI:
 903                 apic_update_ppr(apic);
 904                 val = kvm_apic_get_reg(apic, offset);
 905                 break;
 906         case APIC_TASKPRI:
 907                 report_tpr_access(apic, false);
 908                 /* fall thru */
 909         default:
 910                 val = kvm_apic_get_reg(apic, offset);
 911                 break;
 912         }
 913
 914         return val;
 915 }
 916
 917 static inline struct kvm_lapic *to_lapic(struct kvm_io_device *dev)
 918 {
 919         return container_of(dev, struct kvm_lapic, dev);
 920 }
 921
 922 static int apic_reg_read(struct kvm_lapic *apic, u32 offset, int len,
 923                 void *data)
 924 {
 925         unsigned char alignment = offset & 0xf;
 926         u32 result;
 927         /* this bitmask has a bit cleared for each reserved register */
 928         static const u64 rmask = 0x43ff01ffffffe70cULL;
 929
 930         if ((alignment + len) > 4) {
 931                 apic_debug("KVM_APIC_READ: alignment error %x %d\n",
 932                            offset, len);
 933                 return 1;
 934         }
 935
 936         if (offset > 0x3f0 || !(rmask & (1ULL << (offset >> 4)))) {
 937                 apic_debug("KVM_APIC_READ: read reserved register %x\n",
 938                            offset);
 939                 return 1;
 940         }
 941
 942         result = __apic_read(apic, offset & ~0xf);
 943
 944         trace_kvm_apic_read(offset, result);
 945
 946         switch (len) {
 947         case 1:
 948         case 2:
 949         case 4:
 950                 memcpy(data, (char *)&result + alignment, len);
 951                 break;
 952         default:
 953                 printk(KERN_ERR "Local APIC read with len = %x, "
 954                        "should be 1,2, or 4 instead\n", len);
 955                 break;
 956         }
 957         return 0;
 958 }
 959
 960 static int apic_mmio_in_range(struct kvm_lapic *apic, gpa_t addr)
 961 {
 962         return kvm_apic_hw_enabled(apic) &&
 963             addr >= apic->base_address &&
 964             addr < apic->base_address + LAPIC_MMIO_LENGTH;
 965 }
 966
 967 static int apic_mmio_read(struct kvm_io_device *this,
 968                            gpa_t address, int len, void *data)
 969 {
 970         struct kvm_lapic *apic = to_lapic(this);
 971         u32 offset = address - apic->base_address;
 972
 973         if (!apic_mmio_in_range(apic, address))
 974                 return -EOPNOTSUPP;
 975
 976         apic_reg_read(apic, offset, len, data);
 977
 978         return 0;
 979 }
 980
 981 static void update_divide_count(struct kvm_lapic *apic)
 982 {
 983         u32 tmp1, tmp2, tdcr;
 984
 985         tdcr = kvm_apic_get_reg(apic, APIC_TDCR);
 986         tmp1 = tdcr & 0xf;
 987         tmp2 = ((tmp1 & 0x3) | ((tmp1 & 0x8) >> 1)) + 1;
 988         apic->divide_count = 0x1 << (tmp2 & 0x7);
 989
 990         apic_debug("timer divide count is 0x%x\n",
 991                                    apic->divide_count);
 992 }
 993
 994 static void start_apic_timer(struct kvm_lapic *apic)
 995 {
 996         ktime_t now;
 997         atomic_set(&apic->lapic_timer.pending, 0);
 998
 999         if (apic_lvtt_period(apic) || apic_lvtt_oneshot(apic)) {
1000                 /* lapic timer in oneshot or periodic mode */
1001                 now = apic->lapic_timer.timer.base->get_time();
1002                 apic->lapic_timer.period = (u64)kvm_apic_get_reg(apic, APIC_TMICT)
1003                             * APIC_BUS_CYCLE_NS * apic->divide_count;
1004
1005                 if (!apic->lapic_timer.period)
1006                         return;
1007                 /*
1008                  * Do not allow the guest to program periodic timers with small
1009                  * interval, since the hrtimers are not throttled by the host
1010                  * scheduler.
1011                  */
1012                 if (apic_lvtt_period(apic)) {
1013                         s64 min_period = min_timer_period_us * 1000LL;
1014
1015                         if (apic->lapic_timer.period < min_period) {
1016                                 pr_info_ratelimited(
1017                                     "kvm: vcpu %i: requested %lld ns "
1018                                     "lapic timer period limited to %lld ns\n",
1019                                     apic->vcpu->vcpu_id,
1020                                     apic->lapic_timer.period, min_period);
1021                                 apic->lapic_timer.period = min_period;
1022                         }
1023                 }
1024
1025                 hrtimer_start(&apic->lapic_timer.timer,
1026                               ktime_add_ns(now, apic->lapic_timer.period),
1027                               HRTIMER_MODE_ABS);
1028
1029                 apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016"
1030                            PRIx64 ", "
1031                            "timer initial count 0x%x, period %lldns, "
1032                            "expire @ 0x%016" PRIx64 ".\n", __func__,
1033                            APIC_BUS_CYCLE_NS, ktime_to_ns(now),
1034                            kvm_apic_get_reg(apic, APIC_TMICT),
1035                            apic->lapic_timer.period,
1036                            ktime_to_ns(ktime_add_ns(now,
1037                                         apic->lapic_timer.period)));
1038         } else if (apic_lvtt_tscdeadline(apic)) {
1039                 /* lapic timer in tsc deadline mode */
1040                 u64 guest_tsc, tscdeadline = apic->lapic_timer.tscdeadline;
1041                 u64 ns = 0;
1042                 struct kvm_vcpu *vcpu = apic->vcpu;
1043                 unsigned long this_tsc_khz = vcpu->arch.virtual_tsc_khz;
1044                 unsigned long flags;
1045
1046                 if (unlikely(!tscdeadline || !this_tsc_khz))
1047                         return;
1048
1049                 local_irq_save(flags);
1050
1051                 now = apic->lapic_timer.timer.base->get_time();
1052                 guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu, native_read_tsc());
1053                 if (likely(tscdeadline > guest_tsc)) {
1054                         ns = (tscdeadline - guest_tsc) * 1000000ULL;
1055                         do_div(ns, this_tsc_khz);
1056                 }
1057                 hrtimer_start(&apic->lapic_timer.timer,
1058                         ktime_add_ns(now, ns), HRTIMER_MODE_ABS);
1059
1060                 local_irq_restore(flags);
1061         }
1062 }
1063
1064 static void apic_manage_nmi_watchdog(struct kvm_lapic *apic, u32 lvt0_val)
1065 {
1066         int nmi_wd_enabled = apic_lvt_nmi_mode(kvm_apic_get_reg(apic, APIC_LVT0));
1067
1068         if (apic_lvt_nmi_mode(lvt0_val)) {
1069                 if (!nmi_wd_enabled) {
1070                         apic_debug("Receive NMI setting on APIC_LVT0 "
1071                                    "for cpu %d\n", apic->vcpu->vcpu_id);
1072                         apic->vcpu->kvm->arch.vapics_in_nmi_mode++;
1073                 }
1074         } else if (nmi_wd_enabled)
1075                 apic->vcpu->kvm->arch.vapics_in_nmi_mode--;
1076 }
1077
1078 static int apic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val)
1079 {
1080         int ret = 0;
1081
1082         trace_kvm_apic_write(reg, val);
1083
1084         switch (reg) {
1085         case APIC_ID:           /* Local APIC ID */
1086                 if (!apic_x2apic_mode(apic))
1087                         kvm_apic_set_id(apic, val >> 24);
1088                 else
1089                         ret = 1;
1090                 break;
1091
1092         case APIC_TASKPRI:
1093                 report_tpr_access(apic, true);
1094                 apic_set_tpr(apic, val & 0xff);
1095                 break;
1096
1097         case APIC_EOI:
1098                 apic_set_eoi(apic);
1099                 break;
1100
1101         case APIC_LDR:
1102                 if (!apic_x2apic_mode(apic))
1103                         kvm_apic_set_ldr(apic, val & APIC_LDR_MASK);
1104                 else
1105                         ret = 1;
1106                 break;
1107
1108         case APIC_DFR:
1109                 if (!apic_x2apic_mode(apic)) {
1110                         apic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
1111                         recalculate_apic_map(apic->vcpu->kvm);
1112                 } else
1113                         ret = 1;
1114                 break;
1115
1116         case APIC_SPIV: {
1117                 u32 mask = 0x3ff;
1118                 if (kvm_apic_get_reg(apic, APIC_LVR) & APIC_LVR_DIRECTED_EOI)
1119                         mask |= APIC_SPIV_DIRECTED_EOI;
1120                 apic_set_spiv(apic, val & mask);
1121                 if (!(val & APIC_SPIV_APIC_ENABLED)) {
1122                         int i;
1123                         u32 lvt_val;
1124
1125                         for (i = 0; i < APIC_LVT_NUM; i++) {
1126                                 lvt_val = kvm_apic_get_reg(apic,
1127                                                        APIC_LVTT + 0x10 * i);
1128                                 apic_set_reg(apic, APIC_LVTT + 0x10 * i,
1129                                              lvt_val | APIC_LVT_MASKED);
1130                         }
1131                         atomic_set(&apic->lapic_timer.pending, 0);
1132
1133                 }
1134                 break;
1135         }
1136         case APIC_ICR:
1137                 /* No delay here, so we always clear the pending bit */
1138                 apic_set_reg(apic, APIC_ICR, val & ~(1 << 12));
1139                 apic_send_ipi(apic);
1140                 break;
1141
1142         case APIC_ICR2:
1143                 if (!apic_x2apic_mode(apic))
1144                         val &= 0xff000000;
1145                 apic_set_reg(apic, APIC_ICR2, val);
1146                 break;
1147
1148         case APIC_LVT0:
1149                 apic_manage_nmi_watchdog(apic, val);
1150         case APIC_LVTTHMR:
1151         case APIC_LVTPC:
1152         case APIC_LVT1:
1153         case APIC_LVTERR:
1154                 /* TODO: Check vector */
1155                 if (!kvm_apic_sw_enabled(apic))
1156                         val |= APIC_LVT_MASKED;
1157
1158                 val &= apic_lvt_mask[(reg - APIC_LVTT) >> 4];
1159                 apic_set_reg(apic, reg, val);
1160
1161                 break;
1162
1163         case APIC_LVTT:
1164                 if ((kvm_apic_get_reg(apic, APIC_LVTT) &
1165                     apic->lapic_timer.timer_mode_mask) !=
1166                    (val & apic->lapic_timer.timer_mode_mask))
1167                         hrtimer_cancel(&apic->lapic_timer.timer);
1168
1169                 if (!kvm_apic_sw_enabled(apic))
1170                         val |= APIC_LVT_MASKED;
1171                 val &= (apic_lvt_mask[0] | apic->lapic_timer.timer_mode_mask);
1172                 apic_set_reg(apic, APIC_LVTT, val);
1173                 break;
1174
1175         case APIC_TMICT:
1176                 if (apic_lvtt_tscdeadline(apic))
1177                         break;
1178
1179                 hrtimer_cancel(&apic->lapic_timer.timer);
1180                 apic_set_reg(apic, APIC_TMICT, val);
1181                 start_apic_timer(apic);
1182                 break;
1183
1184         case APIC_TDCR:
1185                 if (val & 4)
1186                         apic_debug("KVM_WRITE:TDCR %x\n", val);
1187                 apic_set_reg(apic, APIC_TDCR, val);
1188                 update_divide_count(apic);
1189                 break;
1190
1191         case APIC_ESR:
1192                 if (apic_x2apic_mode(apic) && val != 0) {
1193                         apic_debug("KVM_WRITE:ESR not zero %x\n", val);
1194                         ret = 1;
1195                 }
1196                 break;
1197
1198         case APIC_SELF_IPI:
1199                 if (apic_x2apic_mode(apic)) {
1200                         apic_reg_write(apic, APIC_ICR, 0x40000 | (val & 0xff));
1201                 } else
1202                         ret = 1;
1203                 break;
1204         default:
1205                 ret = 1;
1206                 break;
1207         }
1208         if (ret)
1209                 apic_debug("Local APIC Write to read-only register %x\n", reg);
1210         return ret;
1211 }
1212
1213 static int apic_mmio_write(struct kvm_io_device *this,
1214                             gpa_t address, int len, const void *data)
1215 {
1216         struct kvm_lapic *apic = to_lapic(this);
1217         unsigned int offset = address - apic->base_address;
1218         u32 val;
1219
1220         if (!apic_mmio_in_range(apic, address))
1221                 return -EOPNOTSUPP;
1222
1223         /*
1224          * APIC register must be aligned on 128-bits boundary.
1225          * 32/64/128 bits registers must be accessed thru 32 bits.
1226          * Refer SDM 8.4.1
1227          */
1228         if (len != 4 || (offset & 0xf)) {
1229                 /* Don't shout loud, $infamous_os would cause only noise. */
1230                 apic_debug("apic write: bad size=%d %lx\n", len, (long)address);
1231                 return 0;
1232         }
1233
1234         val = *(u32*)data;
1235
1236         /* too common printing */
1237         if (offset != APIC_EOI)
1238                 apic_debug("%s: offset 0x%x with length 0x%x, and value is "
1239                            "0x%x\n", __func__, offset, len, val);
1240
1241         apic_reg_write(apic, offset & 0xff0, val);
1242
1243         return 0;
1244 }
1245
1246 void kvm_lapic_set_eoi(struct kvm_vcpu *vcpu)
1247 {
1248         if (kvm_vcpu_has_lapic(vcpu))
1249                 apic_reg_write(vcpu->arch.apic, APIC_EOI, 0);
1250 }
1251 EXPORT_SYMBOL_GPL(kvm_lapic_set_eoi);
1252
1253 /* emulate APIC access in a trap manner */
1254 void kvm_apic_write_nodecode(struct kvm_vcpu *vcpu, u32 offset)
1255 {
1256         u32 val = 0;
1257
1258         /* hw has done the conditional check and inst decode */
1259         offset &= 0xff0;
1260
1261         apic_reg_read(vcpu->arch.apic, offset, 4, &val);
1262
1263         /* TODO: optimize to just emulate side effect w/o one more write */
1264         apic_reg_write(vcpu->arch.apic, offset, val);
1265 }
1266 EXPORT_SYMBOL_GPL(kvm_apic_write_nodecode);
1267
1268 void kvm_free_lapic(struct kvm_vcpu *vcpu)
1269 {
1270         struct kvm_lapic *apic = vcpu->arch.apic;
1271
1272         if (!vcpu->arch.apic)
1273                 return;
1274
1275         hrtimer_cancel(&apic->lapic_timer.timer);
1276
1277         if (!(vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE))
1278                 static_key_slow_dec_deferred(&apic_hw_disabled);
1279
1280         if (!(kvm_apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_APIC_ENABLED))
1281                 static_key_slow_dec_deferred(&apic_sw_disabled);
1282
1283         if (apic->regs)
1284                 free_page((unsigned long)apic->regs);
1285
1286         kfree(apic);
1287 }
1288
1289 /*
1290  *----------------------------------------------------------------------
1291  * LAPIC interface
1292  *----------------------------------------------------------------------
1293  */
1294
1295 u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu)
1296 {
1297         struct kvm_lapic *apic = vcpu->arch.apic;
1298
1299         if (!kvm_vcpu_has_lapic(vcpu) || apic_lvtt_oneshot(apic) ||
1300                         apic_lvtt_period(apic))
1301                 return 0;
1302
1303         return apic->lapic_timer.tscdeadline;
1304 }
1305
1306 void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu, u64 data)
1307 {
1308         struct kvm_lapic *apic = vcpu->arch.apic;
1309
1310         if (!kvm_vcpu_has_lapic(vcpu) || apic_lvtt_oneshot(apic) ||
1311                         apic_lvtt_period(apic))
1312                 return;
1313
1314         hrtimer_cancel(&apic->lapic_timer.timer);
1315         apic->lapic_timer.tscdeadline = data;
1316         start_apic_timer(apic);
1317 }
1318
1319 void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8)
1320 {
1321         struct kvm_lapic *apic = vcpu->arch.apic;
1322
1323         if (!kvm_vcpu_has_lapic(vcpu))
1324                 return;
1325
1326         apic_set_tpr(apic, ((cr8 & 0x0f) << 4)
1327                      | (kvm_apic_get_reg(apic, APIC_TASKPRI) & 4));
1328 }
1329
1330 u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
1331 {
1332         u64 tpr;
1333
1334         if (!kvm_vcpu_has_lapic(vcpu))
1335                 return 0;
1336
1337         tpr = (u64) kvm_apic_get_reg(vcpu->arch.apic, APIC_TASKPRI);
1338
1339         return (tpr & 0xf0) >> 4;
1340 }
1341
1342 void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
1343 {
1344         u64 old_value = vcpu->arch.apic_base;
1345         struct kvm_lapic *apic = vcpu->arch.apic;
1346
1347         if (!apic) {
1348                 value |= MSR_IA32_APICBASE_BSP;
1349                 vcpu->arch.apic_base = value;
1350                 return;
1351         }
1352
1353         /* update jump label if enable bit changes */
1354         if ((vcpu->arch.apic_base ^ value) & MSR_IA32_APICBASE_ENABLE) {
1355                 if (value & MSR_IA32_APICBASE_ENABLE)
1356                         static_key_slow_dec_deferred(&apic_hw_disabled);
1357                 else
1358                         static_key_slow_inc(&apic_hw_disabled.key);
1359                 recalculate_apic_map(vcpu->kvm);
1360         }
1361
1362         if (!kvm_vcpu_is_bsp(apic->vcpu))
1363                 value &= ~MSR_IA32_APICBASE_BSP;
1364
1365         vcpu->arch.apic_base = value;
1366         if ((old_value ^ value) & X2APIC_ENABLE) {
1367                 if (value & X2APIC_ENABLE) {
1368                         u32 id = kvm_apic_id(apic);
1369                         u32 ldr = ((id >> 4) << 16) | (1 << (id & 0xf));
1370                         kvm_apic_set_ldr(apic, ldr);
1371                         kvm_x86_ops->set_virtual_x2apic_mode(vcpu, true);
1372                 } else
1373                         kvm_x86_ops->set_virtual_x2apic_mode(vcpu, false);
1374         }
1375
1376         apic->base_address = apic->vcpu->arch.apic_base &
1377                              MSR_IA32_APICBASE_BASE;
1378
1379         /* with FSB delivery interrupt, we can restart APIC functionality */
1380         apic_debug("apic base msr is 0x%016" PRIx64 ", and base address is "
1381                    "0x%lx.\n", apic->vcpu->arch.apic_base, apic->base_address);
1382
1383 }
1384
1385 void kvm_lapic_reset(struct kvm_vcpu *vcpu)
1386 {
1387         struct kvm_lapic *apic;
1388         int i;
1389
1390         apic_debug("%s\n", __func__);
1391
1392         ASSERT(vcpu);
1393         apic = vcpu->arch.apic;
1394         ASSERT(apic != NULL);
1395
1396         /* Stop the timer in case it's a reset to an active apic */
1397         hrtimer_cancel(&apic->lapic_timer.timer);
1398
1399         kvm_apic_set_id(apic, vcpu->vcpu_id);
1400         kvm_apic_set_version(apic->vcpu);
1401
1402         for (i = 0; i < APIC_LVT_NUM; i++)
1403                 apic_set_reg(apic, APIC_LVTT + 0x10 * i, APIC_LVT_MASKED);
1404         apic_set_reg(apic, APIC_LVT0,
1405                      SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT));
1406
1407         apic_set_reg(apic, APIC_DFR, 0xffffffffU);
1408         apic_set_spiv(apic, 0xff);
1409         apic_set_reg(apic, APIC_TASKPRI, 0);
1410         kvm_apic_set_ldr(apic, 0);
1411         apic_set_reg(apic, APIC_ESR, 0);
1412         apic_set_reg(apic, APIC_ICR, 0);
1413         apic_set_reg(apic, APIC_ICR2, 0);
1414         apic_set_reg(apic, APIC_TDCR, 0);
1415         apic_set_reg(apic, APIC_TMICT, 0);
1416         for (i = 0; i < 8; i++) {
1417                 apic_set_reg(apic, APIC_IRR + 0x10 * i, 0);
1418                 apic_set_reg(apic, APIC_ISR + 0x10 * i, 0);
1419                 apic_set_reg(apic, APIC_TMR + 0x10 * i, 0);
1420         }
1421         apic->irr_pending = kvm_apic_vid_enabled(vcpu->kvm);
1422         apic->isr_count = kvm_apic_vid_enabled(vcpu->kvm);
1423         apic->highest_isr_cache = -1;
1424         update_divide_count(apic);
1425         atomic_set(&apic->lapic_timer.pending, 0);
1426         if (kvm_vcpu_is_bsp(vcpu))
1427                 kvm_lapic_set_base(vcpu,
1428                                 vcpu->arch.apic_base | MSR_IA32_APICBASE_BSP);
1429         vcpu->arch.pv_eoi.msr_val = 0;
1430         apic_update_ppr(apic);
1431
1432         vcpu->arch.apic_arb_prio = 0;
1433         vcpu->arch.apic_attention = 0;
1434
1435         apic_debug(KERN_INFO "%s: vcpu=%p, id=%d, base_msr="
1436                    "0x%016" PRIx64 ", base_address=0x%0lx.\n", __func__,
1437                    vcpu, kvm_apic_id(apic),
1438                    vcpu->arch.apic_base, apic->base_address);
1439 }
1440
1441 /*
1442  *----------------------------------------------------------------------
1443  * timer interface
1444  *----------------------------------------------------------------------
1445  */
1446
1447 static bool lapic_is_periodic(struct kvm_lapic *apic)
1448 {
1449         return apic_lvtt_period(apic);
1450 }
1451
1452 int apic_has_pending_timer(struct kvm_vcpu *vcpu)
1453 {
1454         struct kvm_lapic *apic = vcpu->arch.apic;
1455
1456         if (kvm_vcpu_has_lapic(vcpu) && apic_enabled(apic) &&
1457                         apic_lvt_enabled(apic, APIC_LVTT))
1458                 return atomic_read(&apic->lapic_timer.pending);
1459
1460         return 0;
1461 }
1462
1463 int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type)
1464 {
1465         u32 reg = kvm_apic_get_reg(apic, lvt_type);
1466         int vector, mode, trig_mode;
1467
1468         if (kvm_apic_hw_enabled(apic) && !(reg & APIC_LVT_MASKED)) {
1469                 vector = reg & APIC_VECTOR_MASK;
1470                 mode = reg & APIC_MODE_MASK;
1471                 trig_mode = reg & APIC_LVT_LEVEL_TRIGGER;
1472                 return __apic_accept_irq(apic, mode, vector, 1, trig_mode,
1473                                         NULL);
1474         }
1475         return 0;
1476 }
1477
1478 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu)
1479 {
1480         struct kvm_lapic *apic = vcpu->arch.apic;
1481
1482         if (apic)
1483                 kvm_apic_local_deliver(apic, APIC_LVT0);
1484 }
1485
1486 static const struct kvm_io_device_ops apic_mmio_ops = {
1487         .read     = apic_mmio_read,
1488         .write    = apic_mmio_write,
1489 };
1490
1491 static enum hrtimer_restart apic_timer_fn(struct hrtimer *data)
1492 {
1493         struct kvm_timer *ktimer = container_of(data, struct kvm_timer, timer);
1494         struct kvm_lapic *apic = container_of(ktimer, struct kvm_lapic, lapic_timer);
1495         struct kvm_vcpu *vcpu = apic->vcpu;
1496         wait_queue_head_t *q = &vcpu->wq;
1497
1498         /*
1499          * There is a race window between reading and incrementing, but we do
1500          * not care about potentially losing timer events in the !reinject
1501          * case anyway. Note: KVM_REQ_PENDING_TIMER is implicitly checked
1502          * in vcpu_enter_guest.
1503          */
1504         if (!atomic_read(&ktimer->pending)) {
1505                 atomic_inc(&ktimer->pending);
1506                 /* FIXME: this code should not know anything about vcpus */
1507                 kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu);
1508         }
1509
1510         if (waitqueue_active(q))
1511                 wake_up_interruptible(q);
1512
1513         if (lapic_is_periodic(apic)) {
1514                 hrtimer_add_expires_ns(&ktimer->timer, ktimer->period);
1515                 return HRTIMER_RESTART;
1516         } else
1517                 return HRTIMER_NORESTART;
1518 }
1519
1520 int kvm_create_lapic(struct kvm_vcpu *vcpu)
1521 {
1522         struct kvm_lapic *apic;
1523
1524         ASSERT(vcpu != NULL);
1525         apic_debug("apic_init %d\n", vcpu->vcpu_id);
1526
1527         apic = kzalloc(sizeof(*apic), GFP_KERNEL);
1528         if (!apic)
1529                 goto nomem;
1530
1531         vcpu->arch.apic = apic;
1532
1533         apic->regs = (void *)get_zeroed_page(GFP_KERNEL);
1534         if (!apic->regs) {
1535                 printk(KERN_ERR "malloc apic regs error for vcpu %x\n",
1536                        vcpu->vcpu_id);
1537                 goto nomem_free_apic;
1538         }
1539         apic->vcpu = vcpu;
1540
1541         hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC,
1542                      HRTIMER_MODE_ABS);
1543         apic->lapic_timer.timer.function = apic_timer_fn;
1544
1545         /*
1546          * APIC is created enabled. This will prevent kvm_lapic_set_base from
1547          * thinking that APIC satet has changed.
1548          */
1549         vcpu->arch.apic_base = MSR_IA32_APICBASE_ENABLE;
1550         kvm_lapic_set_base(vcpu,
1551                         APIC_DEFAULT_PHYS_BASE | MSR_IA32_APICBASE_ENABLE);
1552
1553         static_key_slow_inc(&apic_sw_disabled.key); /* sw disabled at reset */
1554         kvm_lapic_reset(vcpu);
1555         kvm_iodevice_init(&apic->dev, &apic_mmio_ops);
1556
1557         return 0;
1558 nomem_free_apic:
1559         kfree(apic);
1560 nomem:
1561         return -ENOMEM;
1562 }
1563
1564 int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
1565 {
1566         struct kvm_lapic *apic = vcpu->arch.apic;
1567         int highest_irr;
1568
1569         if (!kvm_vcpu_has_lapic(vcpu) || !apic_enabled(apic))
1570                 return -1;
1571
1572         apic_update_ppr(apic);
1573         highest_irr = apic_find_highest_irr(apic);
1574         if ((highest_irr == -1) ||
1575             ((highest_irr & 0xF0) <= kvm_apic_get_reg(apic, APIC_PROCPRI)))
1576                 return -1;
1577         return highest_irr;
1578 }
1579
1580 int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
1581 {
1582         u32 lvt0 = kvm_apic_get_reg(vcpu->arch.apic, APIC_LVT0);
1583         int r = 0;
1584
1585         if (!kvm_apic_hw_enabled(vcpu->arch.apic))
1586                 r = 1;
1587         if ((lvt0 & APIC_LVT_MASKED) == 0 &&
1588             GET_APIC_DELIVERY_MODE(lvt0) == APIC_MODE_EXTINT)
1589                 r = 1;
1590         return r;
1591 }
1592
1593 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu)
1594 {
1595         struct kvm_lapic *apic = vcpu->arch.apic;
1596
1597         if (!kvm_vcpu_has_lapic(vcpu))
1598                 return;
1599
1600         if (atomic_read(&apic->lapic_timer.pending) > 0) {
1601                 kvm_apic_local_deliver(apic, APIC_LVTT);
1602                 atomic_set(&apic->lapic_timer.pending, 0);
1603         }
1604 }
1605
1606 int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
1607 {
1608         int vector = kvm_apic_has_interrupt(vcpu);
1609         struct kvm_lapic *apic = vcpu->arch.apic;
1610
1611         if (vector == -1)
1612                 return -1;
1613
1614         apic_set_isr(vector, apic);
1615         apic_update_ppr(apic);
1616         apic_clear_irr(vector, apic);
1617         return vector;
1618 }
1619
1620 void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu,
1621                 struct kvm_lapic_state *s)
1622 {
1623         struct kvm_lapic *apic = vcpu->arch.apic;
1624
1625         kvm_lapic_set_base(vcpu, vcpu->arch.apic_base);
1626         /* set SPIV separately to get count of SW disabled APICs right */
1627         apic_set_spiv(apic, *((u32 *)(s->regs + APIC_SPIV)));
1628         memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
1629         /* call kvm_apic_set_id() to put apic into apic_map */
1630         kvm_apic_set_id(apic, kvm_apic_id(apic));
1631         kvm_apic_set_version(vcpu);
1632
1633         apic_update_ppr(apic);
1634         hrtimer_cancel(&apic->lapic_timer.timer);
1635         update_divide_count(apic);
1636         start_apic_timer(apic);
1637         apic->irr_pending = true;
1638         apic->isr_count = kvm_apic_vid_enabled(vcpu->kvm) ?
1639                                 1 : count_vectors(apic->regs + APIC_ISR);
1640         apic->highest_isr_cache = -1;
1641         kvm_x86_ops->hwapic_isr_update(vcpu->kvm, apic_find_highest_isr(apic));
1642         kvm_make_request(KVM_REQ_EVENT, vcpu);
1643         kvm_rtc_eoi_tracking_restore_one(vcpu);
1644 }
1645
1646 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
1647 {
1648         struct hrtimer *timer;
1649
1650         if (!kvm_vcpu_has_lapic(vcpu))
1651                 return;
1652
1653         timer = &vcpu->arch.apic->lapic_timer.timer;
1654         if (hrtimer_cancel(timer))
1655                 hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
1656 }
1657
1658 /*
1659  * apic_sync_pv_eoi_from_guest - called on vmexit or cancel interrupt
1660  *
1661  * Detect whether guest triggered PV EOI since the
1662  * last entry. If yes, set EOI on guests's behalf.
1663  * Clear PV EOI in guest memory in any case.
1664  */
1665 static void apic_sync_pv_eoi_from_guest(struct kvm_vcpu *vcpu,
1666                                         struct kvm_lapic *apic)
1667 {
1668         bool pending;
1669         int vector;
1670         /*
1671          * PV EOI state is derived from KVM_APIC_PV_EOI_PENDING in host
1672          * and KVM_PV_EOI_ENABLED in guest memory as follows:
1673          *
1674          * KVM_APIC_PV_EOI_PENDING is unset:
1675          *      -> host disabled PV EOI.
1676          * KVM_APIC_PV_EOI_PENDING is set, KVM_PV_EOI_ENABLED is set:
1677          *      -> host enabled PV EOI, guest did not execute EOI yet.
1678          * KVM_APIC_PV_EOI_PENDING is set, KVM_PV_EOI_ENABLED is unset:
1679          *      -> host enabled PV EOI, guest executed EOI.
1680          */
1681         BUG_ON(!pv_eoi_enabled(vcpu));
1682         pending = pv_eoi_get_pending(vcpu);
1683         /*
1684          * Clear pending bit in any case: it will be set again on vmentry.
1685          * While this might not be ideal from performance point of view,
1686          * this makes sure pv eoi is only enabled when we know it's safe.
1687          */
1688         pv_eoi_clr_pending(vcpu);
1689         if (pending)
1690                 return;
1691         vector = apic_set_eoi(apic);
1692         trace_kvm_pv_eoi(apic, vector);
1693 }
1694
1695 void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu)
1696 {
1697         u32 data;
1698
1699         if (test_bit(KVM_APIC_PV_EOI_PENDING, &vcpu->arch.apic_attention))
1700                 apic_sync_pv_eoi_from_guest(vcpu, vcpu->arch.apic);
1701
1702         if (!test_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention))
1703                 return;
1704
1705         kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.apic->vapic_cache, &data,
1706                                 sizeof(u32));
1707
1708         apic_set_tpr(vcpu->arch.apic, data & 0xff);
1709 }
1710
1711 /*
1712  * apic_sync_pv_eoi_to_guest - called before vmentry
1713  *
1714  * Detect whether it's safe to enable PV EOI and
1715  * if yes do so.
1716  */
1717 static void apic_sync_pv_eoi_to_guest(struct kvm_vcpu *vcpu,
1718                                         struct kvm_lapic *apic)
1719 {
1720         if (!pv_eoi_enabled(vcpu) ||
1721             /* IRR set or many bits in ISR: could be nested. */
1722             apic->irr_pending ||
1723             /* Cache not set: could be safe but we don't bother. */
1724             apic->highest_isr_cache == -1 ||
1725             /* Need EOI to update ioapic. */
1726             kvm_ioapic_handles_vector(vcpu->kvm, apic->highest_isr_cache)) {
1727                 /*
1728                  * PV EOI was disabled by apic_sync_pv_eoi_from_guest
1729                  * so we need not do anything here.
1730                  */
1731                 return;
1732         }
1733
1734         pv_eoi_set_pending(apic->vcpu);
1735 }
1736
1737 void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu)
1738 {
1739         u32 data, tpr;
1740         int max_irr, max_isr;
1741         struct kvm_lapic *apic = vcpu->arch.apic;
1742
1743         apic_sync_pv_eoi_to_guest(vcpu, apic);
1744
1745         if (!test_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention))
1746                 return;
1747
1748         tpr = kvm_apic_get_reg(apic, APIC_TASKPRI) & 0xff;
1749         max_irr = apic_find_highest_irr(apic);
1750         if (max_irr < 0)
1751                 max_irr = 0;
1752         max_isr = apic_find_highest_isr(apic);
1753         if (max_isr < 0)
1754                 max_isr = 0;
1755         data = (tpr & 0xff) | ((max_isr & 0xf0) << 8) | (max_irr << 24);
1756
1757         kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apic->vapic_cache, &data,
1758                                 sizeof(u32));
1759 }
1760
1761 int kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr)
1762 {
1763         if (vapic_addr) {
1764                 if (kvm_gfn_to_hva_cache_init(vcpu->kvm,
1765                                         &vcpu->arch.apic->vapic_cache,
1766                                         vapic_addr, sizeof(u32)))
1767                         return -EINVAL;
1768                 __set_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention);
1769         } else {
1770                 __clear_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention);
1771         }
1772
1773         vcpu->arch.apic->vapic_addr = vapic_addr;
1774         return 0;
1775 }
1776
1777 int kvm_x2apic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1778 {
1779         struct kvm_lapic *apic = vcpu->arch.apic;
1780         u32 reg = (msr - APIC_BASE_MSR) << 4;
1781
1782         if (!irqchip_in_kernel(vcpu->kvm) || !apic_x2apic_mode(apic))
1783                 return 1;
1784
1785         /* if this is ICR write vector before command */
1786         if (msr == 0x830)
1787                 apic_reg_write(apic, APIC_ICR2, (u32)(data >> 32));
1788         return apic_reg_write(apic, reg, (u32)data);
1789 }
1790
1791 int kvm_x2apic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
1792 {
1793         struct kvm_lapic *apic = vcpu->arch.apic;
1794         u32 reg = (msr - APIC_BASE_MSR) << 4, low, high = 0;
1795
1796         if (!irqchip_in_kernel(vcpu->kvm) || !apic_x2apic_mode(apic))
1797                 return 1;
1798
1799         if (apic_reg_read(apic, reg, 4, &low))
1800                 return 1;
1801         if (msr == 0x830)
1802                 apic_reg_read(apic, APIC_ICR2, 4, &high);
1803
1804         *data = (((u64)high) << 32) | low;
1805
1806         return 0;
1807 }
1808
1809 int kvm_hv_vapic_msr_write(struct kvm_vcpu *vcpu, u32 reg, u64 data)
1810 {
1811         struct kvm_lapic *apic = vcpu->arch.apic;
1812
1813         if (!kvm_vcpu_has_lapic(vcpu))
1814                 return 1;
1815
1816         /* if this is ICR write vector before command */
1817         if (reg == APIC_ICR)
1818                 apic_reg_write(apic, APIC_ICR2, (u32)(data >> 32));
1819         return apic_reg_write(apic, reg, (u32)data);
1820 }
1821
1822 int kvm_hv_vapic_msr_read(struct kvm_vcpu *vcpu, u32 reg, u64 *data)
1823 {
1824         struct kvm_lapic *apic = vcpu->arch.apic;
1825         u32 low, high = 0;
1826
1827         if (!kvm_vcpu_has_lapic(vcpu))
1828                 return 1;
1829
1830         if (apic_reg_read(apic, reg, 4, &low))
1831                 return 1;
1832         if (reg == APIC_ICR)
1833                 apic_reg_read(apic, APIC_ICR2, 4, &high);
1834
1835         *data = (((u64)high) << 32) | low;
1836
1837         return 0;
1838 }
1839
1840 int kvm_lapic_enable_pv_eoi(struct kvm_vcpu *vcpu, u64 data)
1841 {
1842         u64 addr = data & ~KVM_MSR_ENABLED;
1843         if (!IS_ALIGNED(addr, 4))
1844                 return 1;
1845
1846         vcpu->arch.pv_eoi.msr_val = data;
1847         if (!pv_eoi_enabled(vcpu))
1848                 return 0;
1849         return kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.pv_eoi.data,
1850                                          addr, sizeof(u8));
1851 }
1852
1853 void kvm_apic_accept_events(struct kvm_vcpu *vcpu)
1854 {
1855         struct kvm_lapic *apic = vcpu->arch.apic;
1856         unsigned int sipi_vector;
1857         unsigned long pe;
1858
1859         if (!kvm_vcpu_has_lapic(vcpu) || !apic->pending_events)
1860                 return;
1861
1862         pe = xchg(&apic->pending_events, 0);
1863
1864         if (test_bit(KVM_APIC_INIT, &pe)) {
1865                 kvm_lapic_reset(vcpu);
1866                 kvm_vcpu_reset(vcpu);
1867                 if (kvm_vcpu_is_bsp(apic->vcpu))
1868                         vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
1869                 else
1870                         vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
1871         }
1872         if (test_bit(KVM_APIC_SIPI, &pe) &&
1873             vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
1874                 /* evaluate pending_events before reading the vector */
1875                 smp_rmb();
1876                 sipi_vector = apic->sipi_vector;
1877                 pr_debug("vcpu %d received sipi with vector # %x\n",
1878                          vcpu->vcpu_id, sipi_vector);
1879                 kvm_vcpu_deliver_sipi_vector(vcpu, sipi_vector);
1880                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
1881         }
1882 }
1883
1884 void kvm_lapic_init(void)
1885 {
1886         /* do not patch jump label more than once per second */
1887         jump_label_rate_limit(&apic_hw_disabled, HZ);
1888         jump_label_rate_limit(&apic_sw_disabled, HZ);
1889 }