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