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 <asm/delay.h>
  37 #include <linux/atomic.h>
  38 #include <linux/jump_label.h>
  39 #include "kvm_cache_regs.h"
  40 #include "irq.h"
  41 #include "trace.h"
  42 #include "x86.h"
  43 #include "cpuid.h"
  44
  45 #ifndef CONFIG_X86_64
  46 #define mod_64(x, y) ((x) - (y) * div64_u64(x, y))
  47 #else
  48 #define mod_64(x, y) ((x) % (y))
  49 #endif
  50
  51 #define PRId64 "d"
  52 #define PRIx64 "llx"
  53 #define PRIu64 "u"
  54 #define PRIo64 "o"
  55
  56 #define APIC_BUS_CYCLE_NS 1
  57
  58 /* #define apic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) */
  59 #define apic_debug(fmt, arg...)
  60
  61 #define APIC_LVT_NUM                    6
  62 /* 14 is the version for Xeon and Pentium 8.4.8*/
  63 #define APIC_VERSION                    (0x14UL | ((APIC_LVT_NUM - 1) << 16))
  64 #define LAPIC_MMIO_LENGTH               (1 << 12)
  65 /* followed define is not in apicdef.h */
  66 #define APIC_SHORT_MASK                 0xc0000
  67 #define APIC_DEST_NOSHORT               0x0
  68 #define APIC_DEST_MASK                  0x800
  69 #define MAX_APIC_VECTOR                 256
  70 #define APIC_VECTORS_PER_REG            32
  71
  72 #define APIC_BROADCAST                  0xFF
  73 #define X2APIC_BROADCAST                0xFFFFFFFFul
  74
  75 #define VEC_POS(v) ((v) & (32 - 1))
  76 #define REG_POS(v) (((v) >> 5) << 4)
  77
  78 static inline void apic_set_reg(struct kvm_lapic *apic, int reg_off, u32 val)
  79 {
  80         *((u32 *) (apic->regs + reg_off)) = val;
  81 }
  82
  83 static inline int apic_test_vector(int vec, void *bitmap)
  84 {
  85         return test_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  86 }
  87
  88 bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector)
  89 {
  90         struct kvm_lapic *apic = vcpu->arch.apic;
  91
  92         return apic_test_vector(vector, apic->regs + APIC_ISR) ||
  93                 apic_test_vector(vector, apic->regs + APIC_IRR);
  94 }
  95
  96 static inline void apic_set_vector(int vec, void *bitmap)
  97 {
  98         set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  99 }
 100
 101 static inline void apic_clear_vector(int vec, void *bitmap)
 102 {
 103         clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
 104 }
 105
 106 static inline int __apic_test_and_set_vector(int vec, void *bitmap)
 107 {
 108         return __test_and_set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
 109 }
 110
 111 static inline int __apic_test_and_clear_vector(int vec, void *bitmap)
 112 {
 113         return __test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
 114 }
 115
 116 struct static_key_deferred apic_hw_disabled __read_mostly;
 117 struct static_key_deferred apic_sw_disabled __read_mostly;
 118
 119 static inline int apic_enabled(struct kvm_lapic *apic)
 120 {
 121         return kvm_apic_sw_enabled(apic) &&     kvm_apic_hw_enabled(apic);
 122 }
 123
 124 #define LVT_MASK        \
 125         (APIC_LVT_MASKED | APIC_SEND_PENDING | APIC_VECTOR_MASK)
 126
 127 #define LINT_MASK       \
 128         (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
 129          APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
 130
 131 static inline int kvm_apic_id(struct kvm_lapic *apic)
 132 {
 133         return (kvm_apic_get_reg(apic, APIC_ID) >> 24) & 0xff;
 134 }
 135
 136 /* The logical map is definitely wrong if we have multiple
 137  * modes at the same time.  (Physical map is always right.)
 138  */
 139 static inline bool kvm_apic_logical_map_valid(struct kvm_apic_map *map)
 140 {
 141         return !(map->mode & (map->mode - 1));
 142 }
 143
 144 static inline void
 145 apic_logical_id(struct kvm_apic_map *map, u32 dest_id, u16 *cid, u16 *lid)
 146 {
 147         unsigned lid_bits;
 148
 149         BUILD_BUG_ON(KVM_APIC_MODE_XAPIC_CLUSTER !=  4);
 150         BUILD_BUG_ON(KVM_APIC_MODE_XAPIC_FLAT    !=  8);
 151         BUILD_BUG_ON(KVM_APIC_MODE_X2APIC        != 16);
 152         lid_bits = map->mode;
 153
 154         *cid = dest_id >> lid_bits;
 155         *lid = dest_id & ((1 << lid_bits) - 1);
 156 }
 157
 158 static void recalculate_apic_map(struct kvm *kvm)
 159 {
 160         struct kvm_apic_map *new, *old = NULL;
 161         struct kvm_vcpu *vcpu;
 162         int i;
 163
 164         new = kzalloc(sizeof(struct kvm_apic_map), GFP_KERNEL);
 165
 166         mutex_lock(&kvm->arch.apic_map_lock);
 167
 168         if (!new)
 169                 goto out;
 170
 171         kvm_for_each_vcpu(i, vcpu, kvm) {
 172                 struct kvm_lapic *apic = vcpu->arch.apic;
 173                 u16 cid, lid;
 174                 u32 ldr, aid;
 175
 176                 if (!kvm_apic_present(vcpu))
 177                         continue;
 178
 179                 aid = kvm_apic_id(apic);
 180                 ldr = kvm_apic_get_reg(apic, APIC_LDR);
 181
 182                 if (aid < ARRAY_SIZE(new->phys_map))
 183                         new->phys_map[aid] = apic;
 184
 185                 if (apic_x2apic_mode(apic)) {
 186                         new->mode |= KVM_APIC_MODE_X2APIC;
 187                 } else if (ldr) {
 188                         ldr = GET_APIC_LOGICAL_ID(ldr);
 189                         if (kvm_apic_get_reg(apic, APIC_DFR) == APIC_DFR_FLAT)
 190                                 new->mode |= KVM_APIC_MODE_XAPIC_FLAT;
 191                         else
 192                                 new->mode |= KVM_APIC_MODE_XAPIC_CLUSTER;
 193                 }
 194
 195                 if (!kvm_apic_logical_map_valid(new))
 196                         continue;
 197
 198                 apic_logical_id(new, ldr, &cid, &lid);
 199
 200                 if (lid && cid < ARRAY_SIZE(new->logical_map))
 201                         new->logical_map[cid][ffs(lid) - 1] = apic;
 202         }
 203 out:
 204         old = rcu_dereference_protected(kvm->arch.apic_map,
 205                         lockdep_is_held(&kvm->arch.apic_map_lock));
 206         rcu_assign_pointer(kvm->arch.apic_map, new);
 207         mutex_unlock(&kvm->arch.apic_map_lock);
 208
 209         if (old)
 210                 kfree_rcu(old, rcu);
 211
 212         kvm_vcpu_request_scan_ioapic(kvm);
 213 }
 214
 215 static inline void apic_set_spiv(struct kvm_lapic *apic, u32 val)
 216 {
 217         bool enabled = val & APIC_SPIV_APIC_ENABLED;
 218
 219         apic_set_reg(apic, APIC_SPIV, val);
 220
 221         if (enabled != apic->sw_enabled) {
 222                 apic->sw_enabled = enabled;
 223                 if (enabled) {
 224                         static_key_slow_dec_deferred(&apic_sw_disabled);
 225                         recalculate_apic_map(apic->vcpu->kvm);
 226                 } else
 227                         static_key_slow_inc(&apic_sw_disabled.key);
 228         }
 229 }
 230
 231 static inline void kvm_apic_set_id(struct kvm_lapic *apic, u8 id)
 232 {
 233         apic_set_reg(apic, APIC_ID, id << 24);
 234         recalculate_apic_map(apic->vcpu->kvm);
 235 }
 236
 237 static inline void kvm_apic_set_ldr(struct kvm_lapic *apic, u32 id)
 238 {
 239         apic_set_reg(apic, APIC_LDR, id);
 240         recalculate_apic_map(apic->vcpu->kvm);
 241 }
 242
 243 static inline int apic_lvt_enabled(struct kvm_lapic *apic, int lvt_type)
 244 {
 245         return !(kvm_apic_get_reg(apic, lvt_type) & APIC_LVT_MASKED);
 246 }
 247
 248 static inline int apic_lvt_vector(struct kvm_lapic *apic, int lvt_type)
 249 {
 250         return kvm_apic_get_reg(apic, lvt_type) & APIC_VECTOR_MASK;
 251 }
 252
 253 static inline int apic_lvtt_oneshot(struct kvm_lapic *apic)
 254 {
 255         return apic->lapic_timer.timer_mode == APIC_LVT_TIMER_ONESHOT;
 256 }
 257
 258 static inline int apic_lvtt_period(struct kvm_lapic *apic)
 259 {
 260         return apic->lapic_timer.timer_mode == APIC_LVT_TIMER_PERIODIC;
 261 }
 262
 263 static inline int apic_lvtt_tscdeadline(struct kvm_lapic *apic)
 264 {
 265         return apic->lapic_timer.timer_mode == APIC_LVT_TIMER_TSCDEADLINE;
 266 }
 267
 268 static inline int apic_lvt_nmi_mode(u32 lvt_val)
 269 {
 270         return (lvt_val & (APIC_MODE_MASK | APIC_LVT_MASKED)) == APIC_DM_NMI;
 271 }
 272
 273 void kvm_apic_set_version(struct kvm_vcpu *vcpu)
 274 {
 275         struct kvm_lapic *apic = vcpu->arch.apic;
 276         struct kvm_cpuid_entry2 *feat;
 277         u32 v = APIC_VERSION;
 278
 279         if (!kvm_vcpu_has_lapic(vcpu))
 280                 return;
 281
 282         feat = kvm_find_cpuid_entry(apic->vcpu, 0x1, 0);
 283         if (feat && (feat->ecx & (1 << (X86_FEATURE_X2APIC & 31))))
 284                 v |= APIC_LVR_DIRECTED_EOI;
 285         apic_set_reg(apic, APIC_LVR, v);
 286 }
 287
 288 static const unsigned int apic_lvt_mask[APIC_LVT_NUM] = {
 289         LVT_MASK ,      /* part LVTT mask, timer mode mask added at runtime */
 290         LVT_MASK | APIC_MODE_MASK,      /* LVTTHMR */
 291         LVT_MASK | APIC_MODE_MASK,      /* LVTPC */
 292         LINT_MASK, LINT_MASK,   /* LVT0-1 */
 293         LVT_MASK                /* LVTERR */
 294 };
 295
 296 static int find_highest_vector(void *bitmap)
 297 {
 298         int vec;
 299         u32 *reg;
 300
 301         for (vec = MAX_APIC_VECTOR - APIC_VECTORS_PER_REG;
 302              vec >= 0; vec -= APIC_VECTORS_PER_REG) {
 303                 reg = bitmap + REG_POS(vec);
 304                 if (*reg)
 305                         return fls(*reg) - 1 + vec;
 306         }
 307
 308         return -1;
 309 }
 310
 311 static u8 count_vectors(void *bitmap)
 312 {
 313         int vec;
 314         u32 *reg;
 315         u8 count = 0;
 316
 317         for (vec = 0; vec < MAX_APIC_VECTOR; vec += APIC_VECTORS_PER_REG) {
 318                 reg = bitmap + REG_POS(vec);
 319                 count += hweight32(*reg);
 320         }
 321
 322         return count;
 323 }
 324
 325 void __kvm_apic_update_irr(u32 *pir, void *regs)
 326 {
 327         u32 i, pir_val;
 328
 329         for (i = 0; i <= 7; i++) {
 330                 pir_val = xchg(&pir[i], 0);
 331                 if (pir_val)
 332                         *((u32 *)(regs + APIC_IRR + i * 0x10)) |= pir_val;
 333         }
 334 }
 335 EXPORT_SYMBOL_GPL(__kvm_apic_update_irr);
 336
 337 void kvm_apic_update_irr(struct kvm_vcpu *vcpu, u32 *pir)
 338 {
 339         struct kvm_lapic *apic = vcpu->arch.apic;
 340
 341         __kvm_apic_update_irr(pir, apic->regs);
 342 }
 343 EXPORT_SYMBOL_GPL(kvm_apic_update_irr);
 344
 345 static inline void apic_set_irr(int vec, struct kvm_lapic *apic)
 346 {
 347         apic_set_vector(vec, apic->regs + APIC_IRR);
 348         /*
 349          * irr_pending must be true if any interrupt is pending; set it after
 350          * APIC_IRR to avoid race with apic_clear_irr
 351          */
 352         apic->irr_pending = true;
 353 }
 354
 355 static inline int apic_search_irr(struct kvm_lapic *apic)
 356 {
 357         return find_highest_vector(apic->regs + APIC_IRR);
 358 }
 359
 360 static inline int apic_find_highest_irr(struct kvm_lapic *apic)
 361 {
 362         int result;
 363
 364         /*
 365          * Note that irr_pending is just a hint. It will be always
 366          * true with virtual interrupt delivery enabled.
 367          */
 368         if (!apic->irr_pending)
 369                 return -1;
 370
 371         kvm_x86_ops->sync_pir_to_irr(apic->vcpu);
 372         result = apic_search_irr(apic);
 373         ASSERT(result == -1 || result >= 16);
 374
 375         return result;
 376 }
 377
 378 static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
 379 {
 380         struct kvm_vcpu *vcpu;
 381
 382         vcpu = apic->vcpu;
 383
 384         if (unlikely(kvm_apic_vid_enabled(vcpu->kvm))) {
 385                 /* try to update RVI */
 386                 apic_clear_vector(vec, apic->regs + APIC_IRR);
 387                 kvm_make_request(KVM_REQ_EVENT, vcpu);
 388         } else {
 389                 apic->irr_pending = false;
 390                 apic_clear_vector(vec, apic->regs + APIC_IRR);
 391                 if (apic_search_irr(apic) != -1)
 392                         apic->irr_pending = true;
 393         }
 394 }
 395
 396 static inline void apic_set_isr(int vec, struct kvm_lapic *apic)
 397 {
 398         struct kvm_vcpu *vcpu;
 399
 400         if (__apic_test_and_set_vector(vec, apic->regs + APIC_ISR))
 401                 return;
 402
 403         vcpu = apic->vcpu;
 404
 405         /*
 406          * With APIC virtualization enabled, all caching is disabled
 407          * because the processor can modify ISR under the hood.  Instead
 408          * just set SVI.
 409          */
 410         if (unlikely(kvm_x86_ops->hwapic_isr_update))
 411                 kvm_x86_ops->hwapic_isr_update(vcpu->kvm, vec);
 412         else {
 413                 ++apic->isr_count;
 414                 BUG_ON(apic->isr_count > MAX_APIC_VECTOR);
 415                 /*
 416                  * ISR (in service register) bit is set when injecting an interrupt.
 417                  * The highest vector is injected. Thus the latest bit set matches
 418                  * the highest bit in ISR.
 419                  */
 420                 apic->highest_isr_cache = vec;
 421         }
 422 }
 423
 424 static inline int apic_find_highest_isr(struct kvm_lapic *apic)
 425 {
 426         int result;
 427
 428         /*
 429          * Note that isr_count is always 1, and highest_isr_cache
 430          * is always -1, with APIC virtualization enabled.
 431          */
 432         if (!apic->isr_count)
 433                 return -1;
 434         if (likely(apic->highest_isr_cache != -1))
 435                 return apic->highest_isr_cache;
 436
 437         result = find_highest_vector(apic->regs + APIC_ISR);
 438         ASSERT(result == -1 || result >= 16);
 439
 440         return result;
 441 }
 442
 443 static inline void apic_clear_isr(int vec, struct kvm_lapic *apic)
 444 {
 445         struct kvm_vcpu *vcpu;
 446         if (!__apic_test_and_clear_vector(vec, apic->regs + APIC_ISR))
 447                 return;
 448
 449         vcpu = apic->vcpu;
 450
 451         /*
 452          * We do get here for APIC virtualization enabled if the guest
 453          * uses the Hyper-V APIC enlightenment.  In this case we may need
 454          * to trigger a new interrupt delivery by writing the SVI field;
 455          * on the other hand isr_count and highest_isr_cache are unused
 456          * and must be left alone.
 457          */
 458         if (unlikely(kvm_x86_ops->hwapic_isr_update))
 459                 kvm_x86_ops->hwapic_isr_update(vcpu->kvm,
 460                                                apic_find_highest_isr(apic));
 461         else {
 462                 --apic->isr_count;
 463                 BUG_ON(apic->isr_count < 0);
 464                 apic->highest_isr_cache = -1;
 465         }
 466 }
 467
 468 int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
 469 {
 470         int highest_irr;
 471
 472         /* This may race with setting of irr in __apic_accept_irq() and
 473          * value returned may be wrong, but kvm_vcpu_kick() in __apic_accept_irq
 474          * will cause vmexit immediately and the value will be recalculated
 475          * on the next vmentry.
 476          */
 477         if (!kvm_vcpu_has_lapic(vcpu))
 478                 return 0;
 479         highest_irr = apic_find_highest_irr(vcpu->arch.apic);
 480
 481         return highest_irr;
 482 }
 483
 484 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
 485                              int vector, int level, int trig_mode,
 486                              unsigned long *dest_map);
 487
 488 int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq,
 489                 unsigned long *dest_map)
 490 {
 491         struct kvm_lapic *apic = vcpu->arch.apic;
 492
 493         return __apic_accept_irq(apic, irq->delivery_mode, irq->vector,
 494                         irq->level, irq->trig_mode, dest_map);
 495 }
 496
 497 static int pv_eoi_put_user(struct kvm_vcpu *vcpu, u8 val)
 498 {
 499
 500         return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data, &val,
 501                                       sizeof(val));
 502 }
 503
 504 static int pv_eoi_get_user(struct kvm_vcpu *vcpu, u8 *val)
 505 {
 506
 507         return kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data, val,
 508                                       sizeof(*val));
 509 }
 510
 511 static inline bool pv_eoi_enabled(struct kvm_vcpu *vcpu)
 512 {
 513         return vcpu->arch.pv_eoi.msr_val & KVM_MSR_ENABLED;
 514 }
 515
 516 static bool pv_eoi_get_pending(struct kvm_vcpu *vcpu)
 517 {
 518         u8 val;
 519         if (pv_eoi_get_user(vcpu, &val) < 0)
 520                 apic_debug("Can't read EOI MSR value: 0x%llx\n",
 521                            (unsigned long long)vcpu->arch.pv_eoi.msr_val);
 522         return val & 0x1;
 523 }
 524
 525 static void pv_eoi_set_pending(struct kvm_vcpu *vcpu)
 526 {
 527         if (pv_eoi_put_user(vcpu, KVM_PV_EOI_ENABLED) < 0) {
 528                 apic_debug("Can't set EOI MSR value: 0x%llx\n",
 529                            (unsigned long long)vcpu->arch.pv_eoi.msr_val);
 530                 return;
 531         }
 532         __set_bit(KVM_APIC_PV_EOI_PENDING, &vcpu->arch.apic_attention);
 533 }
 534
 535 static void pv_eoi_clr_pending(struct kvm_vcpu *vcpu)
 536 {
 537         if (pv_eoi_put_user(vcpu, KVM_PV_EOI_DISABLED) < 0) {
 538                 apic_debug("Can't clear EOI MSR value: 0x%llx\n",
 539                            (unsigned long long)vcpu->arch.pv_eoi.msr_val);
 540                 return;
 541         }
 542         __clear_bit(KVM_APIC_PV_EOI_PENDING, &vcpu->arch.apic_attention);
 543 }
 544
 545 void kvm_apic_update_tmr(struct kvm_vcpu *vcpu, u32 *tmr)
 546 {
 547         struct kvm_lapic *apic = vcpu->arch.apic;
 548         int i;
 549
 550         for (i = 0; i < 8; i++)
 551                 apic_set_reg(apic, APIC_TMR + 0x10 * i, tmr[i]);
 552 }
 553
 554 static void apic_update_ppr(struct kvm_lapic *apic)
 555 {
 556         u32 tpr, isrv, ppr, old_ppr;
 557         int isr;
 558
 559         old_ppr = kvm_apic_get_reg(apic, APIC_PROCPRI);
 560         tpr = kvm_apic_get_reg(apic, APIC_TASKPRI);
 561         isr = apic_find_highest_isr(apic);
 562         isrv = (isr != -1) ? isr : 0;
 563
 564         if ((tpr & 0xf0) >= (isrv & 0xf0))
 565                 ppr = tpr & 0xff;
 566         else
 567                 ppr = isrv & 0xf0;
 568
 569         apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x",
 570                    apic, ppr, isr, isrv);
 571
 572         if (old_ppr != ppr) {
 573                 apic_set_reg(apic, APIC_PROCPRI, ppr);
 574                 if (ppr < old_ppr)
 575                         kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
 576         }
 577 }
 578
 579 static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
 580 {
 581         apic_set_reg(apic, APIC_TASKPRI, tpr);
 582         apic_update_ppr(apic);
 583 }
 584
 585 static bool kvm_apic_broadcast(struct kvm_lapic *apic, u32 mda)
 586 {
 587         if (apic_x2apic_mode(apic))
 588                 return mda == X2APIC_BROADCAST;
 589
 590         return GET_APIC_DEST_FIELD(mda) == APIC_BROADCAST;
 591 }
 592
 593 static bool kvm_apic_match_physical_addr(struct kvm_lapic *apic, u32 mda)
 594 {
 595         if (kvm_apic_broadcast(apic, mda))
 596                 return true;
 597
 598         if (apic_x2apic_mode(apic))
 599                 return mda == kvm_apic_id(apic);
 600
 601         return mda == SET_APIC_DEST_FIELD(kvm_apic_id(apic));
 602 }
 603
 604 static bool kvm_apic_match_logical_addr(struct kvm_lapic *apic, u32 mda)
 605 {
 606         u32 logical_id;
 607
 608         if (kvm_apic_broadcast(apic, mda))
 609                 return true;
 610
 611         logical_id = kvm_apic_get_reg(apic, APIC_LDR);
 612
 613         if (apic_x2apic_mode(apic))
 614                 return ((logical_id >> 16) == (mda >> 16))
 615                        && (logical_id & mda & 0xffff) != 0;
 616
 617         logical_id = GET_APIC_LOGICAL_ID(logical_id);
 618         mda = GET_APIC_DEST_FIELD(mda);
 619
 620         switch (kvm_apic_get_reg(apic, APIC_DFR)) {
 621         case APIC_DFR_FLAT:
 622                 return (logical_id & mda) != 0;
 623         case APIC_DFR_CLUSTER:
 624                 return ((logical_id >> 4) == (mda >> 4))
 625                        && (logical_id & mda & 0xf) != 0;
 626         default:
 627                 apic_debug("Bad DFR vcpu %d: %08x\n",
 628                            apic->vcpu->vcpu_id, kvm_apic_get_reg(apic, APIC_DFR));
 629                 return false;
 630         }
 631 }
 632
 633 /* KVM APIC implementation has two quirks
 634  *  - dest always begins at 0 while xAPIC MDA has offset 24,
 635  *  - IOxAPIC messages have to be delivered (directly) to x2APIC.
 636  */
 637 static u32 kvm_apic_mda(unsigned int dest_id, struct kvm_lapic *source,
 638                                               struct kvm_lapic *target)
 639 {
 640         bool ipi = source != NULL;
 641         bool x2apic_mda = apic_x2apic_mode(ipi ? source : target);
 642
 643         if (!ipi && dest_id == APIC_BROADCAST && x2apic_mda)
 644                 return X2APIC_BROADCAST;
 645
 646         return x2apic_mda ? dest_id : SET_APIC_DEST_FIELD(dest_id);
 647 }
 648
 649 bool kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
 650                            int short_hand, unsigned int dest, int dest_mode)
 651 {
 652         struct kvm_lapic *target = vcpu->arch.apic;
 653         u32 mda = kvm_apic_mda(dest, source, target);
 654
 655         apic_debug("target %p, source %p, dest 0x%x, "
 656                    "dest_mode 0x%x, short_hand 0x%x\n",
 657                    target, source, dest, dest_mode, short_hand);
 658
 659         ASSERT(target);
 660         switch (short_hand) {
 661         case APIC_DEST_NOSHORT:
 662                 if (dest_mode == APIC_DEST_PHYSICAL)
 663                         return kvm_apic_match_physical_addr(target, mda);
 664                 else
 665                         return kvm_apic_match_logical_addr(target, mda);
 666         case APIC_DEST_SELF:
 667                 return target == source;
 668         case APIC_DEST_ALLINC:
 669                 return true;
 670         case APIC_DEST_ALLBUT:
 671                 return target != source;
 672         default:
 673                 apic_debug("kvm: apic: Bad dest shorthand value %x\n",
 674                            short_hand);
 675                 return false;
 676         }
 677 }
 678
 679 bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
 680                 struct kvm_lapic_irq *irq, int *r, unsigned long *dest_map)
 681 {
 682         struct kvm_apic_map *map;
 683         unsigned long bitmap = 1;
 684         struct kvm_lapic **dst;
 685         int i;
 686         bool ret = false;
 687         bool x2apic_ipi = src && apic_x2apic_mode(src);
 688
 689         *r = -1;
 690
 691         if (irq->shorthand == APIC_DEST_SELF) {
 692                 *r = kvm_apic_set_irq(src->vcpu, irq, dest_map);
 693                 return true;
 694         }
 695
 696         if (irq->shorthand)
 697                 return false;
 698
 699         if (irq->dest_id == (x2apic_ipi ? X2APIC_BROADCAST : APIC_BROADCAST))
 700                 return false;
 701
 702         rcu_read_lock();
 703         map = rcu_dereference(kvm->arch.apic_map);
 704
 705         if (!map)
 706                 goto out;
 707
 708         ret = true;
 709
 710         if (irq->dest_mode == APIC_DEST_PHYSICAL) {
 711                 if (irq->dest_id >= ARRAY_SIZE(map->phys_map))
 712                         goto out;
 713
 714                 dst = &map->phys_map[irq->dest_id];
 715         } else {
 716                 u16 cid;
 717
 718                 if (!kvm_apic_logical_map_valid(map)) {
 719                         ret = false;
 720                         goto out;
 721                 }
 722
 723                 apic_logical_id(map, irq->dest_id, &cid, (u16 *)&bitmap);
 724
 725                 if (cid >= ARRAY_SIZE(map->logical_map))
 726                         goto out;
 727
 728                 dst = map->logical_map[cid];
 729
 730                 if (irq->delivery_mode == APIC_DM_LOWEST) {
 731                         int l = -1;
 732                         for_each_set_bit(i, &bitmap, 16) {
 733                                 if (!dst[i])
 734                                         continue;
 735                                 if (l < 0)
 736                                         l = i;
 737                                 else if (kvm_apic_compare_prio(dst[i]->vcpu, dst[l]->vcpu) < 0)
 738                                         l = i;
 739                         }
 740
 741                         bitmap = (l >= 0) ? 1 << l : 0;
 742                 }
 743         }
 744
 745         for_each_set_bit(i, &bitmap, 16) {
 746                 if (!dst[i])
 747                         continue;
 748                 if (*r < 0)
 749                         *r = 0;
 750                 *r += kvm_apic_set_irq(dst[i]->vcpu, irq, dest_map);
 751         }
 752 out:
 753         rcu_read_unlock();
 754         return ret;
 755 }
 756
 757 /*
 758  * Add a pending IRQ into lapic.
 759  * Return 1 if successfully added and 0 if discarded.
 760  */
 761 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
 762                              int vector, int level, int trig_mode,
 763                              unsigned long *dest_map)
 764 {
 765         int result = 0;
 766         struct kvm_vcpu *vcpu = apic->vcpu;
 767
 768         trace_kvm_apic_accept_irq(vcpu->vcpu_id, delivery_mode,
 769                                   trig_mode, vector);
 770         switch (delivery_mode) {
 771         case APIC_DM_LOWEST:
 772                 vcpu->arch.apic_arb_prio++;
 773         case APIC_DM_FIXED:
 774                 /* FIXME add logic for vcpu on reset */
 775                 if (unlikely(!apic_enabled(apic)))
 776                         break;
 777
 778                 result = 1;
 779
 780                 if (dest_map)
 781                         __set_bit(vcpu->vcpu_id, dest_map);
 782
 783                 if (kvm_x86_ops->deliver_posted_interrupt)
 784                         kvm_x86_ops->deliver_posted_interrupt(vcpu, vector);
 785                 else {
 786                         apic_set_irr(vector, apic);
 787
 788                         kvm_make_request(KVM_REQ_EVENT, vcpu);
 789                         kvm_vcpu_kick(vcpu);
 790                 }
 791                 break;
 792
 793         case APIC_DM_REMRD:
 794                 result = 1;
 795                 vcpu->arch.pv.pv_unhalted = 1;
 796                 kvm_make_request(KVM_REQ_EVENT, vcpu);
 797                 kvm_vcpu_kick(vcpu);
 798                 break;
 799
 800         case APIC_DM_SMI:
 801                 apic_debug("Ignoring guest SMI\n");
 802                 break;
 803
 804         case APIC_DM_NMI:
 805                 result = 1;
 806                 kvm_inject_nmi(vcpu);
 807                 kvm_vcpu_kick(vcpu);
 808                 break;
 809
 810         case APIC_DM_INIT:
 811                 if (!trig_mode || level) {
 812                         result = 1;
 813                         /* assumes that there are only KVM_APIC_INIT/SIPI */
 814                         apic->pending_events = (1UL << KVM_APIC_INIT);
 815                         /* make sure pending_events is visible before sending
 816                          * the request */
 817                         smp_wmb();
 818                         kvm_make_request(KVM_REQ_EVENT, vcpu);
 819                         kvm_vcpu_kick(vcpu);
 820                 } else {
 821                         apic_debug("Ignoring de-assert INIT to vcpu %d\n",
 822                                    vcpu->vcpu_id);
 823                 }
 824                 break;
 825
 826         case APIC_DM_STARTUP:
 827                 apic_debug("SIPI to vcpu %d vector 0x%02x\n",
 828                            vcpu->vcpu_id, vector);
 829                 result = 1;
 830                 apic->sipi_vector = vector;
 831                 /* make sure sipi_vector is visible for the receiver */
 832                 smp_wmb();
 833                 set_bit(KVM_APIC_SIPI, &apic->pending_events);
 834                 kvm_make_request(KVM_REQ_EVENT, vcpu);
 835                 kvm_vcpu_kick(vcpu);
 836                 break;
 837
 838         case APIC_DM_EXTINT:
 839                 /*
 840                  * Should only be called by kvm_apic_local_deliver() with LVT0,
 841                  * before NMI watchdog was enabled. Already handled by
 842                  * kvm_apic_accept_pic_intr().
 843                  */
 844                 break;
 845
 846         default:
 847                 printk(KERN_ERR "TODO: unsupported delivery mode %x\n",
 848                        delivery_mode);
 849                 break;
 850         }
 851         return result;
 852 }
 853
 854 int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2)
 855 {
 856         return vcpu1->arch.apic_arb_prio - vcpu2->arch.apic_arb_prio;
 857 }
 858
 859 static void kvm_ioapic_send_eoi(struct kvm_lapic *apic, int vector)
 860 {
 861         if (kvm_ioapic_handles_vector(apic->vcpu->kvm, vector)) {
 862                 int trigger_mode;
 863                 if (apic_test_vector(vector, apic->regs + APIC_TMR))
 864                         trigger_mode = IOAPIC_LEVEL_TRIG;
 865                 else
 866                         trigger_mode = IOAPIC_EDGE_TRIG;
 867                 kvm_ioapic_update_eoi(apic->vcpu, vector, trigger_mode);
 868         }
 869 }
 870
 871 static int apic_set_eoi(struct kvm_lapic *apic)
 872 {
 873         int vector = apic_find_highest_isr(apic);
 874
 875         trace_kvm_eoi(apic, vector);
 876
 877         /*
 878          * Not every write EOI will has corresponding ISR,
 879          * one example is when Kernel check timer on setup_IO_APIC
 880          */
 881         if (vector == -1)
 882                 return vector;
 883
 884         apic_clear_isr(vector, apic);
 885         apic_update_ppr(apic);
 886
 887         kvm_ioapic_send_eoi(apic, vector);
 888         kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
 889         return vector;
 890 }
 891
 892 /*
 893  * this interface assumes a trap-like exit, which has already finished
 894  * desired side effect including vISR and vPPR update.
 895  */
 896 void kvm_apic_set_eoi_accelerated(struct kvm_vcpu *vcpu, int vector)
 897 {
 898         struct kvm_lapic *apic = vcpu->arch.apic;
 899
 900         trace_kvm_eoi(apic, vector);
 901
 902         kvm_ioapic_send_eoi(apic, vector);
 903         kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
 904 }
 905 EXPORT_SYMBOL_GPL(kvm_apic_set_eoi_accelerated);
 906
 907 static void apic_send_ipi(struct kvm_lapic *apic)
 908 {
 909         u32 icr_low = kvm_apic_get_reg(apic, APIC_ICR);
 910         u32 icr_high = kvm_apic_get_reg(apic, APIC_ICR2);
 911         struct kvm_lapic_irq irq;
 912
 913         irq.vector = icr_low & APIC_VECTOR_MASK;
 914         irq.delivery_mode = icr_low & APIC_MODE_MASK;
 915         irq.dest_mode = icr_low & APIC_DEST_MASK;
 916         irq.level = icr_low & APIC_INT_ASSERT;
 917         irq.trig_mode = icr_low & APIC_INT_LEVELTRIG;
 918         irq.shorthand = icr_low & APIC_SHORT_MASK;
 919         if (apic_x2apic_mode(apic))
 920                 irq.dest_id = icr_high;
 921         else
 922                 irq.dest_id = GET_APIC_DEST_FIELD(icr_high);
 923
 924         trace_kvm_apic_ipi(icr_low, irq.dest_id);
 925
 926         apic_debug("icr_high 0x%x, icr_low 0x%x, "
 927                    "short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
 928                    "dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x\n",
 929                    icr_high, icr_low, irq.shorthand, irq.dest_id,
 930                    irq.trig_mode, irq.level, irq.dest_mode, irq.delivery_mode,
 931                    irq.vector);
 932
 933         kvm_irq_delivery_to_apic(apic->vcpu->kvm, apic, &irq, NULL);
 934 }
 935
 936 static u32 apic_get_tmcct(struct kvm_lapic *apic)
 937 {
 938         ktime_t remaining;
 939         s64 ns;
 940         u32 tmcct;
 941
 942         ASSERT(apic != NULL);
 943
 944         /* if initial count is 0, current count should also be 0 */
 945         if (kvm_apic_get_reg(apic, APIC_TMICT) == 0 ||
 946                 apic->lapic_timer.period == 0)
 947                 return 0;
 948
 949         remaining = hrtimer_get_remaining(&apic->lapic_timer.timer);
 950         if (ktime_to_ns(remaining) < 0)
 951                 remaining = ktime_set(0, 0);
 952
 953         ns = mod_64(ktime_to_ns(remaining), apic->lapic_timer.period);
 954         tmcct = div64_u64(ns,
 955                          (APIC_BUS_CYCLE_NS * apic->divide_count));
 956
 957         return tmcct;
 958 }
 959
 960 static void __report_tpr_access(struct kvm_lapic *apic, bool write)
 961 {
 962         struct kvm_vcpu *vcpu = apic->vcpu;
 963         struct kvm_run *run = vcpu->run;
 964
 965         kvm_make_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu);
 966         run->tpr_access.rip = kvm_rip_read(vcpu);
 967         run->tpr_access.is_write = write;
 968 }
 969
 970 static inline void report_tpr_access(struct kvm_lapic *apic, bool write)
 971 {
 972         if (apic->vcpu->arch.tpr_access_reporting)
 973                 __report_tpr_access(apic, write);
 974 }
 975
 976 static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset)
 977 {
 978         u32 val = 0;
 979
 980         if (offset >= LAPIC_MMIO_LENGTH)
 981                 return 0;
 982
 983         switch (offset) {
 984         case APIC_ID:
 985                 if (apic_x2apic_mode(apic))
 986                         val = kvm_apic_id(apic);
 987                 else
 988                         val = kvm_apic_id(apic) << 24;
 989                 break;
 990         case APIC_ARBPRI:
 991                 apic_debug("Access APIC ARBPRI register which is for P6\n");
 992                 break;
 993
 994         case APIC_TMCCT:        /* Timer CCR */
 995                 if (apic_lvtt_tscdeadline(apic))
 996                         return 0;
 997
 998                 val = apic_get_tmcct(apic);
 999                 break;
1000         case APIC_PROCPRI:
1001                 apic_update_ppr(apic);
1002                 val = kvm_apic_get_reg(apic, offset);
1003                 break;
1004         case APIC_TASKPRI:
1005                 report_tpr_access(apic, false);
1006                 /* fall thru */
1007         default:
1008                 val = kvm_apic_get_reg(apic, offset);
1009                 break;
1010         }
1011
1012         return val;
1013 }
1014
1015 static inline struct kvm_lapic *to_lapic(struct kvm_io_device *dev)
1016 {
1017         return container_of(dev, struct kvm_lapic, dev);
1018 }
1019
1020 static int apic_reg_read(struct kvm_lapic *apic, u32 offset, int len,
1021                 void *data)
1022 {
1023         unsigned char alignment = offset & 0xf;
1024         u32 result;
1025         /* this bitmask has a bit cleared for each reserved register */
1026         static const u64 rmask = 0x43ff01ffffffe70cULL;
1027
1028         if ((alignment + len) > 4) {
1029                 apic_debug("KVM_APIC_READ: alignment error %x %d\n",
1030                            offset, len);
1031                 return 1;
1032         }
1033
1034         if (offset > 0x3f0 || !(rmask & (1ULL << (offset >> 4)))) {
1035                 apic_debug("KVM_APIC_READ: read reserved register %x\n",
1036                            offset);
1037                 return 1;
1038         }
1039
1040         result = __apic_read(apic, offset & ~0xf);
1041
1042         trace_kvm_apic_read(offset, result);
1043
1044         switch (len) {
1045         case 1:
1046         case 2:
1047         case 4:
1048                 memcpy(data, (char *)&result + alignment, len);
1049                 break;
1050         default:
1051                 printk(KERN_ERR "Local APIC read with len = %x, "
1052                        "should be 1,2, or 4 instead\n", len);
1053                 break;
1054         }
1055         return 0;
1056 }
1057
1058 static int apic_mmio_in_range(struct kvm_lapic *apic, gpa_t addr)
1059 {
1060         return kvm_apic_hw_enabled(apic) &&
1061             addr >= apic->base_address &&
1062             addr < apic->base_address + LAPIC_MMIO_LENGTH;
1063 }
1064
1065 static int apic_mmio_read(struct kvm_vcpu *vcpu, struct kvm_io_device *this,
1066                            gpa_t address, int len, void *data)
1067 {
1068         struct kvm_lapic *apic = to_lapic(this);
1069         u32 offset = address - apic->base_address;
1070
1071         if (!apic_mmio_in_range(apic, address))
1072                 return -EOPNOTSUPP;
1073
1074         apic_reg_read(apic, offset, len, data);
1075
1076         return 0;
1077 }
1078
1079 static void update_divide_count(struct kvm_lapic *apic)
1080 {
1081         u32 tmp1, tmp2, tdcr;
1082
1083         tdcr = kvm_apic_get_reg(apic, APIC_TDCR);
1084         tmp1 = tdcr & 0xf;
1085         tmp2 = ((tmp1 & 0x3) | ((tmp1 & 0x8) >> 1)) + 1;
1086         apic->divide_count = 0x1 << (tmp2 & 0x7);
1087
1088         apic_debug("timer divide count is 0x%x\n",
1089                                    apic->divide_count);
1090 }
1091
1092 static void apic_timer_expired(struct kvm_lapic *apic)
1093 {
1094         struct kvm_vcpu *vcpu = apic->vcpu;
1095         wait_queue_head_t *q = &vcpu->wq;
1096         struct kvm_timer *ktimer = &apic->lapic_timer;
1097
1098         if (atomic_read(&apic->lapic_timer.pending))
1099                 return;
1100
1101         atomic_inc(&apic->lapic_timer.pending);
1102         kvm_set_pending_timer(vcpu);
1103
1104         if (waitqueue_active(q))
1105                 wake_up_interruptible(q);
1106
1107         if (apic_lvtt_tscdeadline(apic))
1108                 ktimer->expired_tscdeadline = ktimer->tscdeadline;
1109 }
1110
1111 /*
1112  * On APICv, this test will cause a busy wait
1113  * during a higher-priority task.
1114  */
1115
1116 static bool lapic_timer_int_injected(struct kvm_vcpu *vcpu)
1117 {
1118         struct kvm_lapic *apic = vcpu->arch.apic;
1119         u32 reg = kvm_apic_get_reg(apic, APIC_LVTT);
1120
1121         if (kvm_apic_hw_enabled(apic)) {
1122                 int vec = reg & APIC_VECTOR_MASK;
1123                 void *bitmap = apic->regs + APIC_ISR;
1124
1125                 if (kvm_x86_ops->deliver_posted_interrupt)
1126                         bitmap = apic->regs + APIC_IRR;
1127
1128                 if (apic_test_vector(vec, bitmap))
1129                         return true;
1130         }
1131         return false;
1132 }
1133
1134 void wait_lapic_expire(struct kvm_vcpu *vcpu)
1135 {
1136         struct kvm_lapic *apic = vcpu->arch.apic;
1137         u64 guest_tsc, tsc_deadline;
1138
1139         if (!kvm_vcpu_has_lapic(vcpu))
1140                 return;
1141
1142         if (apic->lapic_timer.expired_tscdeadline == 0)
1143                 return;
1144
1145         if (!lapic_timer_int_injected(vcpu))
1146                 return;
1147
1148         tsc_deadline = apic->lapic_timer.expired_tscdeadline;
1149         apic->lapic_timer.expired_tscdeadline = 0;
1150         guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu, native_read_tsc());
1151         trace_kvm_wait_lapic_expire(vcpu->vcpu_id, guest_tsc - tsc_deadline);
1152
1153         /* __delay is delay_tsc whenever the hardware has TSC, thus always.  */
1154         if (guest_tsc < tsc_deadline)
1155                 __delay(tsc_deadline - guest_tsc);
1156 }
1157
1158 static void start_apic_timer(struct kvm_lapic *apic)
1159 {
1160         ktime_t now;
1161
1162         atomic_set(&apic->lapic_timer.pending, 0);
1163
1164         if (apic_lvtt_period(apic) || apic_lvtt_oneshot(apic)) {
1165                 /* lapic timer in oneshot or periodic mode */
1166                 now = apic->lapic_timer.timer.base->get_time();
1167                 apic->lapic_timer.period = (u64)kvm_apic_get_reg(apic, APIC_TMICT)
1168                             * APIC_BUS_CYCLE_NS * apic->divide_count;
1169
1170                 if (!apic->lapic_timer.period)
1171                         return;
1172                 /*
1173                  * Do not allow the guest to program periodic timers with small
1174                  * interval, since the hrtimers are not throttled by the host
1175                  * scheduler.
1176                  */
1177                 if (apic_lvtt_period(apic)) {
1178                         s64 min_period = min_timer_period_us * 1000LL;
1179
1180                         if (apic->lapic_timer.period < min_period) {
1181                                 pr_info_ratelimited(
1182                                     "kvm: vcpu %i: requested %lld ns "
1183                                     "lapic timer period limited to %lld ns\n",
1184                                     apic->vcpu->vcpu_id,
1185                                     apic->lapic_timer.period, min_period);
1186                                 apic->lapic_timer.period = min_period;
1187                         }
1188                 }
1189
1190                 hrtimer_start(&apic->lapic_timer.timer,
1191                               ktime_add_ns(now, apic->lapic_timer.period),
1192                               HRTIMER_MODE_ABS);
1193
1194                 apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016"
1195                            PRIx64 ", "
1196                            "timer initial count 0x%x, period %lldns, "
1197                            "expire @ 0x%016" PRIx64 ".\n", __func__,
1198                            APIC_BUS_CYCLE_NS, ktime_to_ns(now),
1199                            kvm_apic_get_reg(apic, APIC_TMICT),
1200                            apic->lapic_timer.period,
1201                            ktime_to_ns(ktime_add_ns(now,
1202                                         apic->lapic_timer.period)));
1203         } else if (apic_lvtt_tscdeadline(apic)) {
1204                 /* lapic timer in tsc deadline mode */
1205                 u64 guest_tsc, tscdeadline = apic->lapic_timer.tscdeadline;
1206                 u64 ns = 0;
1207                 ktime_t expire;
1208                 struct kvm_vcpu *vcpu = apic->vcpu;
1209                 unsigned long this_tsc_khz = vcpu->arch.virtual_tsc_khz;
1210                 unsigned long flags;
1211
1212                 if (unlikely(!tscdeadline || !this_tsc_khz))
1213                         return;
1214
1215                 local_irq_save(flags);
1216
1217                 now = apic->lapic_timer.timer.base->get_time();
1218                 guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu, native_read_tsc());
1219                 if (likely(tscdeadline > guest_tsc)) {
1220                         ns = (tscdeadline - guest_tsc) * 1000000ULL;
1221                         do_div(ns, this_tsc_khz);
1222                         expire = ktime_add_ns(now, ns);
1223                         expire = ktime_sub_ns(expire, lapic_timer_advance_ns);
1224                         hrtimer_start(&apic->lapic_timer.timer,
1225                                       expire, HRTIMER_MODE_ABS);
1226                 } else
1227                         apic_timer_expired(apic);
1228
1229                 local_irq_restore(flags);
1230         }
1231 }
1232
1233 static void apic_manage_nmi_watchdog(struct kvm_lapic *apic, u32 lvt0_val)
1234 {
1235         int nmi_wd_enabled = apic_lvt_nmi_mode(kvm_apic_get_reg(apic, APIC_LVT0));
1236
1237         if (apic_lvt_nmi_mode(lvt0_val)) {
1238                 if (!nmi_wd_enabled) {
1239                         apic_debug("Receive NMI setting on APIC_LVT0 "
1240                                    "for cpu %d\n", apic->vcpu->vcpu_id);
1241                         apic->vcpu->kvm->arch.vapics_in_nmi_mode++;
1242                 }
1243         } else if (nmi_wd_enabled)
1244                 apic->vcpu->kvm->arch.vapics_in_nmi_mode--;
1245 }
1246
1247 static int apic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val)
1248 {
1249         int ret = 0;
1250
1251         trace_kvm_apic_write(reg, val);
1252
1253         switch (reg) {
1254         case APIC_ID:           /* Local APIC ID */
1255                 if (!apic_x2apic_mode(apic))
1256                         kvm_apic_set_id(apic, val >> 24);
1257                 else
1258                         ret = 1;
1259                 break;
1260
1261         case APIC_TASKPRI:
1262                 report_tpr_access(apic, true);
1263                 apic_set_tpr(apic, val & 0xff);
1264                 break;
1265
1266         case APIC_EOI:
1267                 apic_set_eoi(apic);
1268                 break;
1269
1270         case APIC_LDR:
1271                 if (!apic_x2apic_mode(apic))
1272                         kvm_apic_set_ldr(apic, val & APIC_LDR_MASK);
1273                 else
1274                         ret = 1;
1275                 break;
1276
1277         case APIC_DFR:
1278                 if (!apic_x2apic_mode(apic)) {
1279                         apic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
1280                         recalculate_apic_map(apic->vcpu->kvm);
1281                 } else
1282                         ret = 1;
1283                 break;
1284
1285         case APIC_SPIV: {
1286                 u32 mask = 0x3ff;
1287                 if (kvm_apic_get_reg(apic, APIC_LVR) & APIC_LVR_DIRECTED_EOI)
1288                         mask |= APIC_SPIV_DIRECTED_EOI;
1289                 apic_set_spiv(apic, val & mask);
1290                 if (!(val & APIC_SPIV_APIC_ENABLED)) {
1291                         int i;
1292                         u32 lvt_val;
1293
1294                         for (i = 0; i < APIC_LVT_NUM; i++) {
1295                                 lvt_val = kvm_apic_get_reg(apic,
1296                                                        APIC_LVTT + 0x10 * i);
1297                                 apic_set_reg(apic, APIC_LVTT + 0x10 * i,
1298                                              lvt_val | APIC_LVT_MASKED);
1299                         }
1300                         atomic_set(&apic->lapic_timer.pending, 0);
1301
1302                 }
1303                 break;
1304         }
1305         case APIC_ICR:
1306                 /* No delay here, so we always clear the pending bit */
1307                 apic_set_reg(apic, APIC_ICR, val & ~(1 << 12));
1308                 apic_send_ipi(apic);
1309                 break;
1310
1311         case APIC_ICR2:
1312                 if (!apic_x2apic_mode(apic))
1313                         val &= 0xff000000;
1314                 apic_set_reg(apic, APIC_ICR2, val);
1315                 break;
1316
1317         case APIC_LVT0:
1318                 apic_manage_nmi_watchdog(apic, val);
1319         case APIC_LVTTHMR:
1320         case APIC_LVTPC:
1321         case APIC_LVT1:
1322         case APIC_LVTERR:
1323                 /* TODO: Check vector */
1324                 if (!kvm_apic_sw_enabled(apic))
1325                         val |= APIC_LVT_MASKED;
1326
1327                 val &= apic_lvt_mask[(reg - APIC_LVTT) >> 4];
1328                 apic_set_reg(apic, reg, val);
1329
1330                 break;
1331
1332         case APIC_LVTT: {
1333                 u32 timer_mode = val & apic->lapic_timer.timer_mode_mask;
1334
1335                 if (apic->lapic_timer.timer_mode != timer_mode) {
1336                         apic->lapic_timer.timer_mode = timer_mode;
1337                         hrtimer_cancel(&apic->lapic_timer.timer);
1338                 }
1339
1340                 if (!kvm_apic_sw_enabled(apic))
1341                         val |= APIC_LVT_MASKED;
1342                 val &= (apic_lvt_mask[0] | apic->lapic_timer.timer_mode_mask);
1343                 apic_set_reg(apic, APIC_LVTT, val);
1344                 break;
1345         }
1346
1347         case APIC_TMICT:
1348                 if (apic_lvtt_tscdeadline(apic))
1349                         break;
1350
1351                 hrtimer_cancel(&apic->lapic_timer.timer);
1352                 apic_set_reg(apic, APIC_TMICT, val);
1353                 start_apic_timer(apic);
1354                 break;
1355
1356         case APIC_TDCR:
1357                 if (val & 4)
1358                         apic_debug("KVM_WRITE:TDCR %x\n", val);
1359                 apic_set_reg(apic, APIC_TDCR, val);
1360                 update_divide_count(apic);
1361                 break;
1362
1363         case APIC_ESR:
1364                 if (apic_x2apic_mode(apic) && val != 0) {
1365                         apic_debug("KVM_WRITE:ESR not zero %x\n", val);
1366                         ret = 1;
1367                 }
1368                 break;
1369
1370         case APIC_SELF_IPI:
1371                 if (apic_x2apic_mode(apic)) {
1372                         apic_reg_write(apic, APIC_ICR, 0x40000 | (val & 0xff));
1373                 } else
1374                         ret = 1;
1375                 break;
1376         default:
1377                 ret = 1;
1378                 break;
1379         }
1380         if (ret)
1381                 apic_debug("Local APIC Write to read-only register %x\n", reg);
1382         return ret;
1383 }
1384
1385 static int apic_mmio_write(struct kvm_vcpu *vcpu, struct kvm_io_device *this,
1386                             gpa_t address, int len, const void *data)
1387 {
1388         struct kvm_lapic *apic = to_lapic(this);
1389         unsigned int offset = address - apic->base_address;
1390         u32 val;
1391
1392         if (!apic_mmio_in_range(apic, address))
1393                 return -EOPNOTSUPP;
1394
1395         /*
1396          * APIC register must be aligned on 128-bits boundary.
1397          * 32/64/128 bits registers must be accessed thru 32 bits.
1398          * Refer SDM 8.4.1
1399          */
1400         if (len != 4 || (offset & 0xf)) {
1401                 /* Don't shout loud, $infamous_os would cause only noise. */
1402                 apic_debug("apic write: bad size=%d %lx\n", len, (long)address);
1403                 return 0;
1404         }
1405
1406         val = *(u32*)data;
1407
1408         /* too common printing */
1409         if (offset != APIC_EOI)
1410                 apic_debug("%s: offset 0x%x with length 0x%x, and value is "
1411                            "0x%x\n", __func__, offset, len, val);
1412
1413         apic_reg_write(apic, offset & 0xff0, val);
1414
1415         return 0;
1416 }
1417
1418 void kvm_lapic_set_eoi(struct kvm_vcpu *vcpu)
1419 {
1420         if (kvm_vcpu_has_lapic(vcpu))
1421                 apic_reg_write(vcpu->arch.apic, APIC_EOI, 0);
1422 }
1423 EXPORT_SYMBOL_GPL(kvm_lapic_set_eoi);
1424
1425 /* emulate APIC access in a trap manner */
1426 void kvm_apic_write_nodecode(struct kvm_vcpu *vcpu, u32 offset)
1427 {
1428         u32 val = 0;
1429
1430         /* hw has done the conditional check and inst decode */
1431         offset &= 0xff0;
1432
1433         apic_reg_read(vcpu->arch.apic, offset, 4, &val);
1434
1435         /* TODO: optimize to just emulate side effect w/o one more write */
1436         apic_reg_write(vcpu->arch.apic, offset, val);
1437 }
1438 EXPORT_SYMBOL_GPL(kvm_apic_write_nodecode);
1439
1440 void kvm_free_lapic(struct kvm_vcpu *vcpu)
1441 {
1442         struct kvm_lapic *apic = vcpu->arch.apic;
1443
1444         if (!vcpu->arch.apic)
1445                 return;
1446
1447         hrtimer_cancel(&apic->lapic_timer.timer);
1448
1449         if (!(vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE))
1450                 static_key_slow_dec_deferred(&apic_hw_disabled);
1451
1452         if (!apic->sw_enabled)
1453                 static_key_slow_dec_deferred(&apic_sw_disabled);
1454
1455         if (apic->regs)
1456                 free_page((unsigned long)apic->regs);
1457
1458         kfree(apic);
1459 }
1460
1461 /*
1462  *----------------------------------------------------------------------
1463  * LAPIC interface
1464  *----------------------------------------------------------------------
1465  */
1466
1467 u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu)
1468 {
1469         struct kvm_lapic *apic = vcpu->arch.apic;
1470
1471         if (!kvm_vcpu_has_lapic(vcpu) || apic_lvtt_oneshot(apic) ||
1472                         apic_lvtt_period(apic))
1473                 return 0;
1474
1475         return apic->lapic_timer.tscdeadline;
1476 }
1477
1478 void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu, u64 data)
1479 {
1480         struct kvm_lapic *apic = vcpu->arch.apic;
1481
1482         if (!kvm_vcpu_has_lapic(vcpu) || apic_lvtt_oneshot(apic) ||
1483                         apic_lvtt_period(apic))
1484                 return;
1485
1486         hrtimer_cancel(&apic->lapic_timer.timer);
1487         apic->lapic_timer.tscdeadline = data;
1488         start_apic_timer(apic);
1489 }
1490
1491 void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8)
1492 {
1493         struct kvm_lapic *apic = vcpu->arch.apic;
1494
1495         if (!kvm_vcpu_has_lapic(vcpu))
1496                 return;
1497
1498         apic_set_tpr(apic, ((cr8 & 0x0f) << 4)
1499                      | (kvm_apic_get_reg(apic, APIC_TASKPRI) & 4));
1500 }
1501
1502 u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
1503 {
1504         u64 tpr;
1505
1506         if (!kvm_vcpu_has_lapic(vcpu))
1507                 return 0;
1508
1509         tpr = (u64) kvm_apic_get_reg(vcpu->arch.apic, APIC_TASKPRI);
1510
1511         return (tpr & 0xf0) >> 4;
1512 }
1513
1514 void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
1515 {
1516         u64 old_value = vcpu->arch.apic_base;
1517         struct kvm_lapic *apic = vcpu->arch.apic;
1518
1519         if (!apic) {
1520                 value |= MSR_IA32_APICBASE_BSP;
1521                 vcpu->arch.apic_base = value;
1522                 return;
1523         }
1524
1525         vcpu->arch.apic_base = value;
1526
1527         /* update jump label if enable bit changes */
1528         if ((old_value ^ value) & MSR_IA32_APICBASE_ENABLE) {
1529                 if (value & MSR_IA32_APICBASE_ENABLE)
1530                         static_key_slow_dec_deferred(&apic_hw_disabled);
1531                 else
1532                         static_key_slow_inc(&apic_hw_disabled.key);
1533                 recalculate_apic_map(vcpu->kvm);
1534         }
1535
1536         if ((old_value ^ value) & X2APIC_ENABLE) {
1537                 if (value & X2APIC_ENABLE) {
1538                         u32 id = kvm_apic_id(apic);
1539                         u32 ldr = ((id >> 4) << 16) | (1 << (id & 0xf));
1540                         kvm_apic_set_ldr(apic, ldr);
1541                         kvm_x86_ops->set_virtual_x2apic_mode(vcpu, true);
1542                 } else
1543                         kvm_x86_ops->set_virtual_x2apic_mode(vcpu, false);
1544         }
1545
1546         apic->base_address = apic->vcpu->arch.apic_base &
1547                              MSR_IA32_APICBASE_BASE;
1548
1549         if ((value & MSR_IA32_APICBASE_ENABLE) &&
1550              apic->base_address != APIC_DEFAULT_PHYS_BASE)
1551                 pr_warn_once("APIC base relocation is unsupported by KVM");
1552
1553         /* with FSB delivery interrupt, we can restart APIC functionality */
1554         apic_debug("apic base msr is 0x%016" PRIx64 ", and base address is "
1555                    "0x%lx.\n", apic->vcpu->arch.apic_base, apic->base_address);
1556
1557 }
1558
1559 void kvm_lapic_reset(struct kvm_vcpu *vcpu)
1560 {
1561         struct kvm_lapic *apic;
1562         int i;
1563
1564         apic_debug("%s\n", __func__);
1565
1566         ASSERT(vcpu);
1567         apic = vcpu->arch.apic;
1568         ASSERT(apic != NULL);
1569
1570         /* Stop the timer in case it's a reset to an active apic */
1571         hrtimer_cancel(&apic->lapic_timer.timer);
1572
1573         kvm_apic_set_id(apic, vcpu->vcpu_id);
1574         kvm_apic_set_version(apic->vcpu);
1575
1576         for (i = 0; i < APIC_LVT_NUM; i++)
1577                 apic_set_reg(apic, APIC_LVTT + 0x10 * i, APIC_LVT_MASKED);
1578         apic->lapic_timer.timer_mode = 0;
1579         apic_set_reg(apic, APIC_LVT0,
1580                      SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT));
1581
1582         apic_set_reg(apic, APIC_DFR, 0xffffffffU);
1583         apic_set_spiv(apic, 0xff);
1584         apic_set_reg(apic, APIC_TASKPRI, 0);
1585         kvm_apic_set_ldr(apic, 0);
1586         apic_set_reg(apic, APIC_ESR, 0);
1587         apic_set_reg(apic, APIC_ICR, 0);
1588         apic_set_reg(apic, APIC_ICR2, 0);
1589         apic_set_reg(apic, APIC_TDCR, 0);
1590         apic_set_reg(apic, APIC_TMICT, 0);
1591         for (i = 0; i < 8; i++) {
1592                 apic_set_reg(apic, APIC_IRR + 0x10 * i, 0);
1593                 apic_set_reg(apic, APIC_ISR + 0x10 * i, 0);
1594                 apic_set_reg(apic, APIC_TMR + 0x10 * i, 0);
1595         }
1596         apic->irr_pending = kvm_apic_vid_enabled(vcpu->kvm);
1597         apic->isr_count = kvm_x86_ops->hwapic_isr_update ? 1 : 0;
1598         apic->highest_isr_cache = -1;
1599         update_divide_count(apic);
1600         atomic_set(&apic->lapic_timer.pending, 0);
1601         if (kvm_vcpu_is_bsp(vcpu))
1602                 kvm_lapic_set_base(vcpu,
1603                                 vcpu->arch.apic_base | MSR_IA32_APICBASE_BSP);
1604         vcpu->arch.pv_eoi.msr_val = 0;
1605         apic_update_ppr(apic);
1606
1607         vcpu->arch.apic_arb_prio = 0;
1608         vcpu->arch.apic_attention = 0;
1609
1610         apic_debug("%s: vcpu=%p, id=%d, base_msr="
1611                    "0x%016" PRIx64 ", base_address=0x%0lx.\n", __func__,
1612                    vcpu, kvm_apic_id(apic),
1613                    vcpu->arch.apic_base, apic->base_address);
1614 }
1615
1616 /*
1617  *----------------------------------------------------------------------
1618  * timer interface
1619  *----------------------------------------------------------------------
1620  */
1621
1622 static bool lapic_is_periodic(struct kvm_lapic *apic)
1623 {
1624         return apic_lvtt_period(apic);
1625 }
1626
1627 int apic_has_pending_timer(struct kvm_vcpu *vcpu)
1628 {
1629         struct kvm_lapic *apic = vcpu->arch.apic;
1630
1631         if (kvm_vcpu_has_lapic(vcpu) && apic_enabled(apic) &&
1632                         apic_lvt_enabled(apic, APIC_LVTT))
1633                 return atomic_read(&apic->lapic_timer.pending);
1634
1635         return 0;
1636 }
1637
1638 int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type)
1639 {
1640         u32 reg = kvm_apic_get_reg(apic, lvt_type);
1641         int vector, mode, trig_mode;
1642
1643         if (kvm_apic_hw_enabled(apic) && !(reg & APIC_LVT_MASKED)) {
1644                 vector = reg & APIC_VECTOR_MASK;
1645                 mode = reg & APIC_MODE_MASK;
1646                 trig_mode = reg & APIC_LVT_LEVEL_TRIGGER;
1647                 return __apic_accept_irq(apic, mode, vector, 1, trig_mode,
1648                                         NULL);
1649         }
1650         return 0;
1651 }
1652
1653 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu)
1654 {
1655         struct kvm_lapic *apic = vcpu->arch.apic;
1656
1657         if (apic)
1658                 kvm_apic_local_deliver(apic, APIC_LVT0);
1659 }
1660
1661 static const struct kvm_io_device_ops apic_mmio_ops = {
1662         .read     = apic_mmio_read,
1663         .write    = apic_mmio_write,
1664 };
1665
1666 static enum hrtimer_restart apic_timer_fn(struct hrtimer *data)
1667 {
1668         struct kvm_timer *ktimer = container_of(data, struct kvm_timer, timer);
1669         struct kvm_lapic *apic = container_of(ktimer, struct kvm_lapic, lapic_timer);
1670
1671         apic_timer_expired(apic);
1672
1673         if (lapic_is_periodic(apic)) {
1674                 hrtimer_add_expires_ns(&ktimer->timer, ktimer->period);
1675                 return HRTIMER_RESTART;
1676         } else
1677                 return HRTIMER_NORESTART;
1678 }
1679
1680 int kvm_create_lapic(struct kvm_vcpu *vcpu)
1681 {
1682         struct kvm_lapic *apic;
1683
1684         ASSERT(vcpu != NULL);
1685         apic_debug("apic_init %d\n", vcpu->vcpu_id);
1686
1687         apic = kzalloc(sizeof(*apic), GFP_KERNEL);
1688         if (!apic)
1689                 goto nomem;
1690
1691         vcpu->arch.apic = apic;
1692
1693         apic->regs = (void *)get_zeroed_page(GFP_KERNEL);
1694         if (!apic->regs) {
1695                 printk(KERN_ERR "malloc apic regs error for vcpu %x\n",
1696                        vcpu->vcpu_id);
1697                 goto nomem_free_apic;
1698         }
1699         apic->vcpu = vcpu;
1700
1701         hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC,
1702                      HRTIMER_MODE_ABS);
1703         apic->lapic_timer.timer.function = apic_timer_fn;
1704
1705         /*
1706          * APIC is created enabled. This will prevent kvm_lapic_set_base from
1707          * thinking that APIC satet has changed.
1708          */
1709         vcpu->arch.apic_base = MSR_IA32_APICBASE_ENABLE;
1710         kvm_lapic_set_base(vcpu,
1711                         APIC_DEFAULT_PHYS_BASE | MSR_IA32_APICBASE_ENABLE);
1712
1713         static_key_slow_inc(&apic_sw_disabled.key); /* sw disabled at reset */
1714         kvm_lapic_reset(vcpu);
1715         kvm_iodevice_init(&apic->dev, &apic_mmio_ops);
1716
1717         return 0;
1718 nomem_free_apic:
1719         kfree(apic);
1720 nomem:
1721         return -ENOMEM;
1722 }
1723
1724 int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
1725 {
1726         struct kvm_lapic *apic = vcpu->arch.apic;
1727         int highest_irr;
1728
1729         if (!kvm_vcpu_has_lapic(vcpu) || !apic_enabled(apic))
1730                 return -1;
1731
1732         apic_update_ppr(apic);
1733         highest_irr = apic_find_highest_irr(apic);
1734         if ((highest_irr == -1) ||
1735             ((highest_irr & 0xF0) <= kvm_apic_get_reg(apic, APIC_PROCPRI)))
1736                 return -1;
1737         return highest_irr;
1738 }
1739
1740 int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
1741 {
1742         u32 lvt0 = kvm_apic_get_reg(vcpu->arch.apic, APIC_LVT0);
1743         int r = 0;
1744
1745         if (!kvm_apic_hw_enabled(vcpu->arch.apic))
1746                 r = 1;
1747         if ((lvt0 & APIC_LVT_MASKED) == 0 &&
1748             GET_APIC_DELIVERY_MODE(lvt0) == APIC_MODE_EXTINT)
1749                 r = 1;
1750         return r;
1751 }
1752
1753 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu)
1754 {
1755         struct kvm_lapic *apic = vcpu->arch.apic;
1756
1757         if (!kvm_vcpu_has_lapic(vcpu))
1758                 return;
1759
1760         if (atomic_read(&apic->lapic_timer.pending) > 0) {
1761                 kvm_apic_local_deliver(apic, APIC_LVTT);
1762                 if (apic_lvtt_tscdeadline(apic))
1763                         apic->lapic_timer.tscdeadline = 0;
1764                 atomic_set(&apic->lapic_timer.pending, 0);
1765         }
1766 }
1767
1768 int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
1769 {
1770         int vector = kvm_apic_has_interrupt(vcpu);
1771         struct kvm_lapic *apic = vcpu->arch.apic;
1772
1773         if (vector == -1)
1774                 return -1;
1775
1776         /*
1777          * We get here even with APIC virtualization enabled, if doing
1778          * nested virtualization and L1 runs with the "acknowledge interrupt
1779          * on exit" mode.  Then we cannot inject the interrupt via RVI,
1780          * because the process would deliver it through the IDT.
1781          */
1782
1783         apic_set_isr(vector, apic);
1784         apic_update_ppr(apic);
1785         apic_clear_irr(vector, apic);
1786         return vector;
1787 }
1788
1789 void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu,
1790                 struct kvm_lapic_state *s)
1791 {
1792         struct kvm_lapic *apic = vcpu->arch.apic;
1793
1794         kvm_lapic_set_base(vcpu, vcpu->arch.apic_base);
1795         /* set SPIV separately to get count of SW disabled APICs right */
1796         apic_set_spiv(apic, *((u32 *)(s->regs + APIC_SPIV)));
1797         memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
1798         /* call kvm_apic_set_id() to put apic into apic_map */
1799         kvm_apic_set_id(apic, kvm_apic_id(apic));
1800         kvm_apic_set_version(vcpu);
1801
1802         apic_update_ppr(apic);
1803         hrtimer_cancel(&apic->lapic_timer.timer);
1804         update_divide_count(apic);
1805         start_apic_timer(apic);
1806         apic->irr_pending = true;
1807         apic->isr_count = kvm_x86_ops->hwapic_isr_update ?
1808                                 1 : count_vectors(apic->regs + APIC_ISR);
1809         apic->highest_isr_cache = -1;
1810         if (kvm_x86_ops->hwapic_irr_update)
1811                 kvm_x86_ops->hwapic_irr_update(vcpu,
1812                                 apic_find_highest_irr(apic));
1813         if (unlikely(kvm_x86_ops->hwapic_isr_update))
1814                 kvm_x86_ops->hwapic_isr_update(vcpu->kvm,
1815                                 apic_find_highest_isr(apic));
1816         kvm_make_request(KVM_REQ_EVENT, vcpu);
1817         kvm_rtc_eoi_tracking_restore_one(vcpu);
1818 }
1819
1820 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
1821 {
1822         struct hrtimer *timer;
1823
1824         if (!kvm_vcpu_has_lapic(vcpu))
1825                 return;
1826
1827         timer = &vcpu->arch.apic->lapic_timer.timer;
1828         if (hrtimer_cancel(timer))
1829                 hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
1830 }
1831
1832 /*
1833  * apic_sync_pv_eoi_from_guest - called on vmexit or cancel interrupt
1834  *
1835  * Detect whether guest triggered PV EOI since the
1836  * last entry. If yes, set EOI on guests's behalf.
1837  * Clear PV EOI in guest memory in any case.
1838  */
1839 static void apic_sync_pv_eoi_from_guest(struct kvm_vcpu *vcpu,
1840                                         struct kvm_lapic *apic)
1841 {
1842         bool pending;
1843         int vector;
1844         /*
1845          * PV EOI state is derived from KVM_APIC_PV_EOI_PENDING in host
1846          * and KVM_PV_EOI_ENABLED in guest memory as follows:
1847          *
1848          * KVM_APIC_PV_EOI_PENDING is unset:
1849          *      -> host disabled PV EOI.
1850          * KVM_APIC_PV_EOI_PENDING is set, KVM_PV_EOI_ENABLED is set:
1851          *      -> host enabled PV EOI, guest did not execute EOI yet.
1852          * KVM_APIC_PV_EOI_PENDING is set, KVM_PV_EOI_ENABLED is unset:
1853          *      -> host enabled PV EOI, guest executed EOI.
1854          */
1855         BUG_ON(!pv_eoi_enabled(vcpu));
1856         pending = pv_eoi_get_pending(vcpu);
1857         /*
1858          * Clear pending bit in any case: it will be set again on vmentry.
1859          * While this might not be ideal from performance point of view,
1860          * this makes sure pv eoi is only enabled when we know it's safe.
1861          */
1862         pv_eoi_clr_pending(vcpu);
1863         if (pending)
1864                 return;
1865         vector = apic_set_eoi(apic);
1866         trace_kvm_pv_eoi(apic, vector);
1867 }
1868
1869 void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu)
1870 {
1871         u32 data;
1872
1873         if (test_bit(KVM_APIC_PV_EOI_PENDING, &vcpu->arch.apic_attention))
1874                 apic_sync_pv_eoi_from_guest(vcpu, vcpu->arch.apic);
1875
1876         if (!test_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention))
1877                 return;
1878
1879         kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.apic->vapic_cache, &data,
1880                                 sizeof(u32));
1881
1882         apic_set_tpr(vcpu->arch.apic, data & 0xff);
1883 }
1884
1885 /*
1886  * apic_sync_pv_eoi_to_guest - called before vmentry
1887  *
1888  * Detect whether it's safe to enable PV EOI and
1889  * if yes do so.
1890  */
1891 static void apic_sync_pv_eoi_to_guest(struct kvm_vcpu *vcpu,
1892                                         struct kvm_lapic *apic)
1893 {
1894         if (!pv_eoi_enabled(vcpu) ||
1895             /* IRR set or many bits in ISR: could be nested. */
1896             apic->irr_pending ||
1897             /* Cache not set: could be safe but we don't bother. */
1898             apic->highest_isr_cache == -1 ||
1899             /* Need EOI to update ioapic. */
1900             kvm_ioapic_handles_vector(vcpu->kvm, apic->highest_isr_cache)) {
1901                 /*
1902                  * PV EOI was disabled by apic_sync_pv_eoi_from_guest
1903                  * so we need not do anything here.
1904                  */
1905                 return;
1906         }
1907
1908         pv_eoi_set_pending(apic->vcpu);
1909 }
1910
1911 void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu)
1912 {
1913         u32 data, tpr;
1914         int max_irr, max_isr;
1915         struct kvm_lapic *apic = vcpu->arch.apic;
1916
1917         apic_sync_pv_eoi_to_guest(vcpu, apic);
1918
1919         if (!test_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention))
1920                 return;
1921
1922         tpr = kvm_apic_get_reg(apic, APIC_TASKPRI) & 0xff;
1923         max_irr = apic_find_highest_irr(apic);
1924         if (max_irr < 0)
1925                 max_irr = 0;
1926         max_isr = apic_find_highest_isr(apic);
1927         if (max_isr < 0)
1928                 max_isr = 0;
1929         data = (tpr & 0xff) | ((max_isr & 0xf0) << 8) | (max_irr << 24);
1930
1931         kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apic->vapic_cache, &data,
1932                                 sizeof(u32));
1933 }
1934
1935 int kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr)
1936 {
1937         if (vapic_addr) {
1938                 if (kvm_gfn_to_hva_cache_init(vcpu->kvm,
1939                                         &vcpu->arch.apic->vapic_cache,
1940                                         vapic_addr, sizeof(u32)))
1941                         return -EINVAL;
1942                 __set_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention);
1943         } else {
1944                 __clear_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention);
1945         }
1946
1947         vcpu->arch.apic->vapic_addr = vapic_addr;
1948         return 0;
1949 }
1950
1951 int kvm_x2apic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1952 {
1953         struct kvm_lapic *apic = vcpu->arch.apic;
1954         u32 reg = (msr - APIC_BASE_MSR) << 4;
1955
1956         if (!irqchip_in_kernel(vcpu->kvm) || !apic_x2apic_mode(apic))
1957                 return 1;
1958
1959         if (reg == APIC_ICR2)
1960                 return 1;
1961
1962         /* if this is ICR write vector before command */
1963         if (reg == APIC_ICR)
1964                 apic_reg_write(apic, APIC_ICR2, (u32)(data >> 32));
1965         return apic_reg_write(apic, reg, (u32)data);
1966 }
1967
1968 int kvm_x2apic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
1969 {
1970         struct kvm_lapic *apic = vcpu->arch.apic;
1971         u32 reg = (msr - APIC_BASE_MSR) << 4, low, high = 0;
1972
1973         if (!irqchip_in_kernel(vcpu->kvm) || !apic_x2apic_mode(apic))
1974                 return 1;
1975
1976         if (reg == APIC_DFR || reg == APIC_ICR2) {
1977                 apic_debug("KVM_APIC_READ: read x2apic reserved register %x\n",
1978                            reg);
1979                 return 1;
1980         }
1981
1982         if (apic_reg_read(apic, reg, 4, &low))
1983                 return 1;
1984         if (reg == APIC_ICR)
1985                 apic_reg_read(apic, APIC_ICR2, 4, &high);
1986
1987         *data = (((u64)high) << 32) | low;
1988
1989         return 0;
1990 }
1991
1992 int kvm_hv_vapic_msr_write(struct kvm_vcpu *vcpu, u32 reg, u64 data)
1993 {
1994         struct kvm_lapic *apic = vcpu->arch.apic;
1995
1996         if (!kvm_vcpu_has_lapic(vcpu))
1997                 return 1;
1998
1999         /* if this is ICR write vector before command */
2000         if (reg == APIC_ICR)
2001                 apic_reg_write(apic, APIC_ICR2, (u32)(data >> 32));
2002         return apic_reg_write(apic, reg, (u32)data);
2003 }
2004
2005 int kvm_hv_vapic_msr_read(struct kvm_vcpu *vcpu, u32 reg, u64 *data)
2006 {
2007         struct kvm_lapic *apic = vcpu->arch.apic;
2008         u32 low, high = 0;
2009
2010         if (!kvm_vcpu_has_lapic(vcpu))
2011                 return 1;
2012
2013         if (apic_reg_read(apic, reg, 4, &low))
2014                 return 1;
2015         if (reg == APIC_ICR)
2016                 apic_reg_read(apic, APIC_ICR2, 4, &high);
2017
2018         *data = (((u64)high) << 32) | low;
2019
2020         return 0;
2021 }
2022
2023 int kvm_lapic_enable_pv_eoi(struct kvm_vcpu *vcpu, u64 data)
2024 {
2025         u64 addr = data & ~KVM_MSR_ENABLED;
2026         if (!IS_ALIGNED(addr, 4))
2027                 return 1;
2028
2029         vcpu->arch.pv_eoi.msr_val = data;
2030         if (!pv_eoi_enabled(vcpu))
2031                 return 0;
2032         return kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.pv_eoi.data,
2033                                          addr, sizeof(u8));
2034 }
2035
2036 void kvm_apic_accept_events(struct kvm_vcpu *vcpu)
2037 {
2038         struct kvm_lapic *apic = vcpu->arch.apic;
2039         u8 sipi_vector;
2040         unsigned long pe;
2041
2042         if (!kvm_vcpu_has_lapic(vcpu) || !apic->pending_events)
2043                 return;
2044
2045         pe = xchg(&apic->pending_events, 0);
2046
2047         if (test_bit(KVM_APIC_INIT, &pe)) {
2048                 kvm_lapic_reset(vcpu);
2049                 kvm_vcpu_reset(vcpu);
2050                 if (kvm_vcpu_is_bsp(apic->vcpu))
2051                         vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
2052                 else
2053                         vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
2054         }
2055         if (test_bit(KVM_APIC_SIPI, &pe) &&
2056             vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
2057                 /* evaluate pending_events before reading the vector */
2058                 smp_rmb();
2059                 sipi_vector = apic->sipi_vector;
2060                 apic_debug("vcpu %d received sipi with vector # %x\n",
2061                          vcpu->vcpu_id, sipi_vector);
2062                 kvm_vcpu_deliver_sipi_vector(vcpu, sipi_vector);
2063                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
2064         }
2065 }
2066
2067 void kvm_lapic_init(void)
2068 {
2069         /* do not patch jump label more than once per second */
2070         jump_label_rate_limit(&apic_hw_disabled, HZ);
2071         jump_label_rate_limit(&apic_sw_disabled, HZ);
2072 }