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/export.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 #include "hyperv.h"
  45
  46 #ifndef CONFIG_X86_64
  47 #define mod_64(x, y) ((x) - (y) * div64_u64(x, y))
  48 #else
  49 #define mod_64(x, y) ((x) % (y))
  50 #endif
  51
  52 #define PRId64 "d"
  53 #define PRIx64 "llx"
  54 #define PRIu64 "u"
  55 #define PRIo64 "o"
  56
  57 /* #define apic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) */
  58 #define apic_debug(fmt, arg...) do {} while (0)
  59
  60 /* 14 is the version for Xeon and Pentium 8.4.8*/
  61 #define APIC_VERSION                    (0x14UL | ((KVM_APIC_LVT_NUM - 1) << 16))
  62 #define LAPIC_MMIO_LENGTH               (1 << 12)
  63 /* followed define is not in apicdef.h */
  64 #define APIC_SHORT_MASK                 0xc0000
  65 #define APIC_DEST_NOSHORT               0x0
  66 #define APIC_DEST_MASK                  0x800
  67 #define MAX_APIC_VECTOR                 256
  68 #define APIC_VECTORS_PER_REG            32
  69
  70 #define APIC_BROADCAST                  0xFF
  71 #define X2APIC_BROADCAST                0xFFFFFFFFul
  72
  73 static bool lapic_timer_advance_adjust_done = false;
  74 #define LAPIC_TIMER_ADVANCE_ADJUST_DONE 100
  75 /* step-by-step approximation to mitigate fluctuation */
  76 #define LAPIC_TIMER_ADVANCE_ADJUST_STEP 8
  77
  78 static inline int apic_test_vector(int vec, void *bitmap)
  79 {
  80         return test_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  81 }
  82
  83 bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector)
  84 {
  85         struct kvm_lapic *apic = vcpu->arch.apic;
  86
  87         return apic_test_vector(vector, apic->regs + APIC_ISR) ||
  88                 apic_test_vector(vector, apic->regs + APIC_IRR);
  89 }
  90
  91 static inline void apic_clear_vector(int vec, void *bitmap)
  92 {
  93         clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  94 }
  95
  96 static inline int __apic_test_and_set_vector(int vec, void *bitmap)
  97 {
  98         return __test_and_set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  99 }
 100
 101 static inline int __apic_test_and_clear_vector(int vec, void *bitmap)
 102 {
 103         return __test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
 104 }
 105
 106 struct static_key_deferred apic_hw_disabled __read_mostly;
 107 struct static_key_deferred apic_sw_disabled __read_mostly;
 108
 109 static inline int apic_enabled(struct kvm_lapic *apic)
 110 {
 111         return kvm_apic_sw_enabled(apic) &&     kvm_apic_hw_enabled(apic);
 112 }
 113
 114 #define LVT_MASK        \
 115         (APIC_LVT_MASKED | APIC_SEND_PENDING | APIC_VECTOR_MASK)
 116
 117 #define LINT_MASK       \
 118         (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
 119          APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
 120
 121 static inline u8 kvm_xapic_id(struct kvm_lapic *apic)
 122 {
 123         return kvm_lapic_get_reg(apic, APIC_ID) >> 24;
 124 }
 125
 126 static inline u32 kvm_x2apic_id(struct kvm_lapic *apic)
 127 {
 128         return apic->vcpu->vcpu_id;
 129 }
 130
 131 static inline bool kvm_apic_map_get_logical_dest(struct kvm_apic_map *map,
 132                 u32 dest_id, struct kvm_lapic ***cluster, u16 *mask) {
 133         switch (map->mode) {
 134         case KVM_APIC_MODE_X2APIC: {
 135                 u32 offset = (dest_id >> 16) * 16;
 136                 u32 max_apic_id = map->max_apic_id;
 137
 138                 if (offset <= max_apic_id) {
 139                         u8 cluster_size = min(max_apic_id - offset + 1, 16U);
 140
 141                         offset = array_index_nospec(offset, map->max_apic_id + 1);
 142                         *cluster = &map->phys_map[offset];
 143                         *mask = dest_id & (0xffff >> (16 - cluster_size));
 144                 } else {
 145                         *mask = 0;
 146                 }
 147
 148                 return true;
 149                 }
 150         case KVM_APIC_MODE_XAPIC_FLAT:
 151                 *cluster = map->xapic_flat_map;
 152                 *mask = dest_id & 0xff;
 153                 return true;
 154         case KVM_APIC_MODE_XAPIC_CLUSTER:
 155                 *cluster = map->xapic_cluster_map[(dest_id >> 4) & 0xf];
 156                 *mask = dest_id & 0xf;
 157                 return true;
 158         default:
 159                 /* Not optimized. */
 160                 return false;
 161         }
 162 }
 163
 164 static void kvm_apic_map_free(struct rcu_head *rcu)
 165 {
 166         struct kvm_apic_map *map = container_of(rcu, struct kvm_apic_map, rcu);
 167
 168         kvfree(map);
 169 }
 170
 171 static void recalculate_apic_map(struct kvm *kvm)
 172 {
 173         struct kvm_apic_map *new, *old = NULL;
 174         struct kvm_vcpu *vcpu;
 175         int i;
 176         u32 max_id = 255; /* enough space for any xAPIC ID */
 177
 178         mutex_lock(&kvm->arch.apic_map_lock);
 179
 180         kvm_for_each_vcpu(i, vcpu, kvm)
 181                 if (kvm_apic_present(vcpu))
 182                         max_id = max(max_id, kvm_x2apic_id(vcpu->arch.apic));
 183
 184         new = kvzalloc(sizeof(struct kvm_apic_map) +
 185                            sizeof(struct kvm_lapic *) * ((u64)max_id + 1),
 186                            GFP_KERNEL_ACCOUNT);
 187
 188         if (!new)
 189                 goto out;
 190
 191         new->max_apic_id = max_id;
 192
 193         kvm_for_each_vcpu(i, vcpu, kvm) {
 194                 struct kvm_lapic *apic = vcpu->arch.apic;
 195                 struct kvm_lapic **cluster;
 196                 u16 mask;
 197                 u32 ldr;
 198                 u8 xapic_id;
 199                 u32 x2apic_id;
 200
 201                 if (!kvm_apic_present(vcpu))
 202                         continue;
 203
 204                 xapic_id = kvm_xapic_id(apic);
 205                 x2apic_id = kvm_x2apic_id(apic);
 206
 207                 /* Hotplug hack: see kvm_apic_match_physical_addr(), ... */
 208                 if ((apic_x2apic_mode(apic) || x2apic_id > 0xff) &&
 209                                 x2apic_id <= new->max_apic_id)
 210                         new->phys_map[x2apic_id] = apic;
 211                 /*
 212                  * ... xAPIC ID of VCPUs with APIC ID > 0xff will wrap-around,
 213                  * prevent them from masking VCPUs with APIC ID <= 0xff.
 214                  */
 215                 if (!apic_x2apic_mode(apic) && !new->phys_map[xapic_id])
 216                         new->phys_map[xapic_id] = apic;
 217
 218                 ldr = kvm_lapic_get_reg(apic, APIC_LDR);
 219
 220                 if (apic_x2apic_mode(apic)) {
 221                         new->mode |= KVM_APIC_MODE_X2APIC;
 222                 } else if (ldr) {
 223                         ldr = GET_APIC_LOGICAL_ID(ldr);
 224                         if (kvm_lapic_get_reg(apic, APIC_DFR) == APIC_DFR_FLAT)
 225                                 new->mode |= KVM_APIC_MODE_XAPIC_FLAT;
 226                         else
 227                                 new->mode |= KVM_APIC_MODE_XAPIC_CLUSTER;
 228                 }
 229
 230                 if (!kvm_apic_map_get_logical_dest(new, ldr, &cluster, &mask))
 231                         continue;
 232
 233                 if (mask)
 234                         cluster[ffs(mask) - 1] = apic;
 235         }
 236 out:
 237         old = rcu_dereference_protected(kvm->arch.apic_map,
 238                         lockdep_is_held(&kvm->arch.apic_map_lock));
 239         rcu_assign_pointer(kvm->arch.apic_map, new);
 240         mutex_unlock(&kvm->arch.apic_map_lock);
 241
 242         if (old)
 243                 call_rcu(&old->rcu, kvm_apic_map_free);
 244
 245         kvm_make_scan_ioapic_request(kvm);
 246 }
 247
 248 static inline void apic_set_spiv(struct kvm_lapic *apic, u32 val)
 249 {
 250         bool enabled = val & APIC_SPIV_APIC_ENABLED;
 251
 252         kvm_lapic_set_reg(apic, APIC_SPIV, val);
 253
 254         if (enabled != apic->sw_enabled) {
 255                 apic->sw_enabled = enabled;
 256                 if (enabled)
 257                         static_key_slow_dec_deferred(&apic_sw_disabled);
 258                 else
 259                         static_key_slow_inc(&apic_sw_disabled.key);
 260         }
 261 }
 262
 263 static inline void kvm_apic_set_xapic_id(struct kvm_lapic *apic, u8 id)
 264 {
 265         kvm_lapic_set_reg(apic, APIC_ID, id << 24);
 266         recalculate_apic_map(apic->vcpu->kvm);
 267 }
 268
 269 static inline void kvm_apic_set_ldr(struct kvm_lapic *apic, u32 id)
 270 {
 271         kvm_lapic_set_reg(apic, APIC_LDR, id);
 272         recalculate_apic_map(apic->vcpu->kvm);
 273 }
 274
 275 static inline u32 kvm_apic_calc_x2apic_ldr(u32 id)
 276 {
 277         return ((id >> 4) << 16) | (1 << (id & 0xf));
 278 }
 279
 280 static inline void kvm_apic_set_x2apic_id(struct kvm_lapic *apic, u32 id)
 281 {
 282         u32 ldr = kvm_apic_calc_x2apic_ldr(id);
 283
 284         WARN_ON_ONCE(id != apic->vcpu->vcpu_id);
 285
 286         kvm_lapic_set_reg(apic, APIC_ID, id);
 287         kvm_lapic_set_reg(apic, APIC_LDR, ldr);
 288         recalculate_apic_map(apic->vcpu->kvm);
 289 }
 290
 291 static inline int apic_lvt_enabled(struct kvm_lapic *apic, int lvt_type)
 292 {
 293         return !(kvm_lapic_get_reg(apic, lvt_type) & APIC_LVT_MASKED);
 294 }
 295
 296 static inline int apic_lvt_vector(struct kvm_lapic *apic, int lvt_type)
 297 {
 298         return kvm_lapic_get_reg(apic, lvt_type) & APIC_VECTOR_MASK;
 299 }
 300
 301 static inline int apic_lvtt_oneshot(struct kvm_lapic *apic)
 302 {
 303         return apic->lapic_timer.timer_mode == APIC_LVT_TIMER_ONESHOT;
 304 }
 305
 306 static inline int apic_lvtt_period(struct kvm_lapic *apic)
 307 {
 308         return apic->lapic_timer.timer_mode == APIC_LVT_TIMER_PERIODIC;
 309 }
 310
 311 static inline int apic_lvtt_tscdeadline(struct kvm_lapic *apic)
 312 {
 313         return apic->lapic_timer.timer_mode == APIC_LVT_TIMER_TSCDEADLINE;
 314 }
 315
 316 static inline int apic_lvt_nmi_mode(u32 lvt_val)
 317 {
 318         return (lvt_val & (APIC_MODE_MASK | APIC_LVT_MASKED)) == APIC_DM_NMI;
 319 }
 320
 321 void kvm_apic_set_version(struct kvm_vcpu *vcpu)
 322 {
 323         struct kvm_lapic *apic = vcpu->arch.apic;
 324         struct kvm_cpuid_entry2 *feat;
 325         u32 v = APIC_VERSION;
 326
 327         if (!lapic_in_kernel(vcpu))
 328                 return;
 329
 330         /*
 331          * KVM emulates 82093AA datasheet (with in-kernel IOAPIC implementation)
 332          * which doesn't have EOI register; Some buggy OSes (e.g. Windows with
 333          * Hyper-V role) disable EOI broadcast in lapic not checking for IOAPIC
 334          * version first and level-triggered interrupts never get EOIed in
 335          * IOAPIC.
 336          */
 337         feat = kvm_find_cpuid_entry(apic->vcpu, 0x1, 0);
 338         if (feat && (feat->ecx & (1 << (X86_FEATURE_X2APIC & 31))) &&
 339             !ioapic_in_kernel(vcpu->kvm))
 340                 v |= APIC_LVR_DIRECTED_EOI;
 341         kvm_lapic_set_reg(apic, APIC_LVR, v);
 342 }
 343
 344 static const unsigned int apic_lvt_mask[KVM_APIC_LVT_NUM] = {
 345         LVT_MASK ,      /* part LVTT mask, timer mode mask added at runtime */
 346         LVT_MASK | APIC_MODE_MASK,      /* LVTTHMR */
 347         LVT_MASK | APIC_MODE_MASK,      /* LVTPC */
 348         LINT_MASK, LINT_MASK,   /* LVT0-1 */
 349         LVT_MASK                /* LVTERR */
 350 };
 351
 352 static int find_highest_vector(void *bitmap)
 353 {
 354         int vec;
 355         u32 *reg;
 356
 357         for (vec = MAX_APIC_VECTOR - APIC_VECTORS_PER_REG;
 358              vec >= 0; vec -= APIC_VECTORS_PER_REG) {
 359                 reg = bitmap + REG_POS(vec);
 360                 if (*reg)
 361                         return __fls(*reg) + vec;
 362         }
 363
 364         return -1;
 365 }
 366
 367 static u8 count_vectors(void *bitmap)
 368 {
 369         int vec;
 370         u32 *reg;
 371         u8 count = 0;
 372
 373         for (vec = 0; vec < MAX_APIC_VECTOR; vec += APIC_VECTORS_PER_REG) {
 374                 reg = bitmap + REG_POS(vec);
 375                 count += hweight32(*reg);
 376         }
 377
 378         return count;
 379 }
 380
 381 bool __kvm_apic_update_irr(u32 *pir, void *regs, int *max_irr)
 382 {
 383         u32 i, vec;
 384         u32 pir_val, irr_val, prev_irr_val;
 385         int max_updated_irr;
 386
 387         max_updated_irr = -1;
 388         *max_irr = -1;
 389
 390         for (i = vec = 0; i <= 7; i++, vec += 32) {
 391                 pir_val = READ_ONCE(pir[i]);
 392                 irr_val = *((u32 *)(regs + APIC_IRR + i * 0x10));
 393                 if (pir_val) {
 394                         prev_irr_val = irr_val;
 395                         irr_val |= xchg(&pir[i], 0);
 396                         *((u32 *)(regs + APIC_IRR + i * 0x10)) = irr_val;
 397                         if (prev_irr_val != irr_val) {
 398                                 max_updated_irr =
 399                                         __fls(irr_val ^ prev_irr_val) + vec;
 400                         }
 401                 }
 402                 if (irr_val)
 403                         *max_irr = __fls(irr_val) + vec;
 404         }
 405
 406         return ((max_updated_irr != -1) &&
 407                 (max_updated_irr == *max_irr));
 408 }
 409 EXPORT_SYMBOL_GPL(__kvm_apic_update_irr);
 410
 411 bool kvm_apic_update_irr(struct kvm_vcpu *vcpu, u32 *pir, int *max_irr)
 412 {
 413         struct kvm_lapic *apic = vcpu->arch.apic;
 414
 415         return __kvm_apic_update_irr(pir, apic->regs, max_irr);
 416 }
 417 EXPORT_SYMBOL_GPL(kvm_apic_update_irr);
 418
 419 static inline int apic_search_irr(struct kvm_lapic *apic)
 420 {
 421         return find_highest_vector(apic->regs + APIC_IRR);
 422 }
 423
 424 static inline int apic_find_highest_irr(struct kvm_lapic *apic)
 425 {
 426         int result;
 427
 428         /*
 429          * Note that irr_pending is just a hint. It will be always
 430          * true with virtual interrupt delivery enabled.
 431          */
 432         if (!apic->irr_pending)
 433                 return -1;
 434
 435         result = apic_search_irr(apic);
 436         ASSERT(result == -1 || result >= 16);
 437
 438         return result;
 439 }
 440
 441 static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
 442 {
 443         struct kvm_vcpu *vcpu;
 444
 445         vcpu = apic->vcpu;
 446
 447         if (unlikely(vcpu->arch.apicv_active)) {
 448                 /* need to update RVI */
 449                 apic_clear_vector(vec, apic->regs + APIC_IRR);
 450                 kvm_x86_ops->hwapic_irr_update(vcpu,
 451                                 apic_find_highest_irr(apic));
 452         } else {
 453                 apic->irr_pending = false;
 454                 apic_clear_vector(vec, apic->regs + APIC_IRR);
 455                 if (apic_search_irr(apic) != -1)
 456                         apic->irr_pending = true;
 457         }
 458 }
 459
 460 static inline void apic_set_isr(int vec, struct kvm_lapic *apic)
 461 {
 462         struct kvm_vcpu *vcpu;
 463
 464         if (__apic_test_and_set_vector(vec, apic->regs + APIC_ISR))
 465                 return;
 466
 467         vcpu = apic->vcpu;
 468
 469         /*
 470          * With APIC virtualization enabled, all caching is disabled
 471          * because the processor can modify ISR under the hood.  Instead
 472          * just set SVI.
 473          */
 474         if (unlikely(vcpu->arch.apicv_active))
 475                 kvm_x86_ops->hwapic_isr_update(vcpu, vec);
 476         else {
 477                 ++apic->isr_count;
 478                 BUG_ON(apic->isr_count > MAX_APIC_VECTOR);
 479                 /*
 480                  * ISR (in service register) bit is set when injecting an interrupt.
 481                  * The highest vector is injected. Thus the latest bit set matches
 482                  * the highest bit in ISR.
 483                  */
 484                 apic->highest_isr_cache = vec;
 485         }
 486 }
 487
 488 static inline int apic_find_highest_isr(struct kvm_lapic *apic)
 489 {
 490         int result;
 491
 492         /*
 493          * Note that isr_count is always 1, and highest_isr_cache
 494          * is always -1, with APIC virtualization enabled.
 495          */
 496         if (!apic->isr_count)
 497                 return -1;
 498         if (likely(apic->highest_isr_cache != -1))
 499                 return apic->highest_isr_cache;
 500
 501         result = find_highest_vector(apic->regs + APIC_ISR);
 502         ASSERT(result == -1 || result >= 16);
 503
 504         return result;
 505 }
 506
 507 static inline void apic_clear_isr(int vec, struct kvm_lapic *apic)
 508 {
 509         struct kvm_vcpu *vcpu;
 510         if (!__apic_test_and_clear_vector(vec, apic->regs + APIC_ISR))
 511                 return;
 512
 513         vcpu = apic->vcpu;
 514
 515         /*
 516          * We do get here for APIC virtualization enabled if the guest
 517          * uses the Hyper-V APIC enlightenment.  In this case we may need
 518          * to trigger a new interrupt delivery by writing the SVI field;
 519          * on the other hand isr_count and highest_isr_cache are unused
 520          * and must be left alone.
 521          */
 522         if (unlikely(vcpu->arch.apicv_active))
 523                 kvm_x86_ops->hwapic_isr_update(vcpu,
 524                                                apic_find_highest_isr(apic));
 525         else {
 526                 --apic->isr_count;
 527                 BUG_ON(apic->isr_count < 0);
 528                 apic->highest_isr_cache = -1;
 529         }
 530 }
 531
 532 int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
 533 {
 534         /* This may race with setting of irr in __apic_accept_irq() and
 535          * value returned may be wrong, but kvm_vcpu_kick() in __apic_accept_irq
 536          * will cause vmexit immediately and the value will be recalculated
 537          * on the next vmentry.
 538          */
 539         return apic_find_highest_irr(vcpu->arch.apic);
 540 }
 541 EXPORT_SYMBOL_GPL(kvm_lapic_find_highest_irr);
 542
 543 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
 544                              int vector, int level, int trig_mode,
 545                              struct dest_map *dest_map);
 546
 547 int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq,
 548                      struct dest_map *dest_map)
 549 {
 550         struct kvm_lapic *apic = vcpu->arch.apic;
 551
 552         return __apic_accept_irq(apic, irq->delivery_mode, irq->vector,
 553                         irq->level, irq->trig_mode, dest_map);
 554 }
 555
 556 int kvm_pv_send_ipi(struct kvm *kvm, unsigned long ipi_bitmap_low,
 557                     unsigned long ipi_bitmap_high, u32 min,
 558                     unsigned long icr, int op_64_bit)
 559 {
 560         int i;
 561         struct kvm_apic_map *map;
 562         struct kvm_vcpu *vcpu;
 563         struct kvm_lapic_irq irq = {0};
 564         int cluster_size = op_64_bit ? 64 : 32;
 565         int count = 0;
 566
 567         irq.vector = icr & APIC_VECTOR_MASK;
 568         irq.delivery_mode = icr & APIC_MODE_MASK;
 569         irq.level = (icr & APIC_INT_ASSERT) != 0;
 570         irq.trig_mode = icr & APIC_INT_LEVELTRIG;
 571
 572         if (icr & APIC_DEST_MASK)
 573                 return -KVM_EINVAL;
 574         if (icr & APIC_SHORT_MASK)
 575                 return -KVM_EINVAL;
 576
 577         rcu_read_lock();
 578         map = rcu_dereference(kvm->arch.apic_map);
 579
 580         if (unlikely(!map)) {
 581                 count = -EOPNOTSUPP;
 582                 goto out;
 583         }
 584
 585         if (min > map->max_apic_id)
 586                 goto out;
 587         /* Bits above cluster_size are masked in the caller.  */
 588         for_each_set_bit(i, &ipi_bitmap_low,
 589                 min((u32)BITS_PER_LONG, (map->max_apic_id - min + 1))) {
 590                 if (map->phys_map[min + i]) {
 591                         vcpu = map->phys_map[min + i]->vcpu;
 592                         count += kvm_apic_set_irq(vcpu, &irq, NULL);
 593                 }
 594         }
 595
 596         min += cluster_size;
 597
 598         if (min > map->max_apic_id)
 599                 goto out;
 600
 601         for_each_set_bit(i, &ipi_bitmap_high,
 602                 min((u32)BITS_PER_LONG, (map->max_apic_id - min + 1))) {
 603                 if (map->phys_map[min + i]) {
 604                         vcpu = map->phys_map[min + i]->vcpu;
 605                         count += kvm_apic_set_irq(vcpu, &irq, NULL);
 606                 }
 607         }
 608
 609 out:
 610         rcu_read_unlock();
 611         return count;
 612 }
 613
 614 static int pv_eoi_put_user(struct kvm_vcpu *vcpu, u8 val)
 615 {
 616
 617         return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data, &val,
 618                                       sizeof(val));
 619 }
 620
 621 static int pv_eoi_get_user(struct kvm_vcpu *vcpu, u8 *val)
 622 {
 623
 624         return kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data, val,
 625                                       sizeof(*val));
 626 }
 627
 628 static inline bool pv_eoi_enabled(struct kvm_vcpu *vcpu)
 629 {
 630         return vcpu->arch.pv_eoi.msr_val & KVM_MSR_ENABLED;
 631 }
 632
 633 static bool pv_eoi_get_pending(struct kvm_vcpu *vcpu)
 634 {
 635         u8 val;
 636         if (pv_eoi_get_user(vcpu, &val) < 0)
 637                 apic_debug("Can't read EOI MSR value: 0x%llx\n",
 638                            (unsigned long long)vcpu->arch.pv_eoi.msr_val);
 639         return val & 0x1;
 640 }
 641
 642 static void pv_eoi_set_pending(struct kvm_vcpu *vcpu)
 643 {
 644         if (pv_eoi_put_user(vcpu, KVM_PV_EOI_ENABLED) < 0) {
 645                 apic_debug("Can't set EOI MSR value: 0x%llx\n",
 646                            (unsigned long long)vcpu->arch.pv_eoi.msr_val);
 647                 return;
 648         }
 649         __set_bit(KVM_APIC_PV_EOI_PENDING, &vcpu->arch.apic_attention);
 650 }
 651
 652 static void pv_eoi_clr_pending(struct kvm_vcpu *vcpu)
 653 {
 654         if (pv_eoi_put_user(vcpu, KVM_PV_EOI_DISABLED) < 0) {
 655                 apic_debug("Can't clear EOI MSR value: 0x%llx\n",
 656                            (unsigned long long)vcpu->arch.pv_eoi.msr_val);
 657                 return;
 658         }
 659         __clear_bit(KVM_APIC_PV_EOI_PENDING, &vcpu->arch.apic_attention);
 660 }
 661
 662 static int apic_has_interrupt_for_ppr(struct kvm_lapic *apic, u32 ppr)
 663 {
 664         int highest_irr;
 665         if (apic->vcpu->arch.apicv_active)
 666                 highest_irr = kvm_x86_ops->sync_pir_to_irr(apic->vcpu);
 667         else
 668                 highest_irr = apic_find_highest_irr(apic);
 669         if (highest_irr == -1 || (highest_irr & 0xF0) <= ppr)
 670                 return -1;
 671         return highest_irr;
 672 }
 673
 674 static bool __apic_update_ppr(struct kvm_lapic *apic, u32 *new_ppr)
 675 {
 676         u32 tpr, isrv, ppr, old_ppr;
 677         int isr;
 678
 679         old_ppr = kvm_lapic_get_reg(apic, APIC_PROCPRI);
 680         tpr = kvm_lapic_get_reg(apic, APIC_TASKPRI);
 681         isr = apic_find_highest_isr(apic);
 682         isrv = (isr != -1) ? isr : 0;
 683
 684         if ((tpr & 0xf0) >= (isrv & 0xf0))
 685                 ppr = tpr & 0xff;
 686         else
 687                 ppr = isrv & 0xf0;
 688
 689         apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x",
 690                    apic, ppr, isr, isrv);
 691
 692         *new_ppr = ppr;
 693         if (old_ppr != ppr)
 694                 kvm_lapic_set_reg(apic, APIC_PROCPRI, ppr);
 695
 696         return ppr < old_ppr;
 697 }
 698
 699 static void apic_update_ppr(struct kvm_lapic *apic)
 700 {
 701         u32 ppr;
 702
 703         if (__apic_update_ppr(apic, &ppr) &&
 704             apic_has_interrupt_for_ppr(apic, ppr) != -1)
 705                 kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
 706 }
 707
 708 void kvm_apic_update_ppr(struct kvm_vcpu *vcpu)
 709 {
 710         apic_update_ppr(vcpu->arch.apic);
 711 }
 712 EXPORT_SYMBOL_GPL(kvm_apic_update_ppr);
 713
 714 static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
 715 {
 716         kvm_lapic_set_reg(apic, APIC_TASKPRI, tpr);
 717         apic_update_ppr(apic);
 718 }
 719
 720 static bool kvm_apic_broadcast(struct kvm_lapic *apic, u32 mda)
 721 {
 722         return mda == (apic_x2apic_mode(apic) ?
 723                         X2APIC_BROADCAST : APIC_BROADCAST);
 724 }
 725
 726 static bool kvm_apic_match_physical_addr(struct kvm_lapic *apic, u32 mda)
 727 {
 728         if (kvm_apic_broadcast(apic, mda))
 729                 return true;
 730
 731         if (apic_x2apic_mode(apic))
 732                 return mda == kvm_x2apic_id(apic);
 733
 734         /*
 735          * Hotplug hack: Make LAPIC in xAPIC mode also accept interrupts as if
 736          * it were in x2APIC mode.  Hotplugged VCPUs start in xAPIC mode and
 737          * this allows unique addressing of VCPUs with APIC ID over 0xff.
 738          * The 0xff condition is needed because writeable xAPIC ID.
 739          */
 740         if (kvm_x2apic_id(apic) > 0xff && mda == kvm_x2apic_id(apic))
 741                 return true;
 742
 743         return mda == kvm_xapic_id(apic);
 744 }
 745
 746 static bool kvm_apic_match_logical_addr(struct kvm_lapic *apic, u32 mda)
 747 {
 748         u32 logical_id;
 749
 750         if (kvm_apic_broadcast(apic, mda))
 751                 return true;
 752
 753         logical_id = kvm_lapic_get_reg(apic, APIC_LDR);
 754
 755         if (apic_x2apic_mode(apic))
 756                 return ((logical_id >> 16) == (mda >> 16))
 757                        && (logical_id & mda & 0xffff) != 0;
 758
 759         logical_id = GET_APIC_LOGICAL_ID(logical_id);
 760
 761         switch (kvm_lapic_get_reg(apic, APIC_DFR)) {
 762         case APIC_DFR_FLAT:
 763                 return (logical_id & mda) != 0;
 764         case APIC_DFR_CLUSTER:
 765                 return ((logical_id >> 4) == (mda >> 4))
 766                        && (logical_id & mda & 0xf) != 0;
 767         default:
 768                 apic_debug("Bad DFR vcpu %d: %08x\n",
 769                            apic->vcpu->vcpu_id, kvm_lapic_get_reg(apic, APIC_DFR));
 770                 return false;
 771         }
 772 }
 773
 774 /* The KVM local APIC implementation has two quirks:
 775  *
 776  *  - Real hardware delivers interrupts destined to x2APIC ID > 0xff to LAPICs
 777  *    in xAPIC mode if the "destination & 0xff" matches its xAPIC ID.
 778  *    KVM doesn't do that aliasing.
 779  *
 780  *  - in-kernel IOAPIC messages have to be delivered directly to
 781  *    x2APIC, because the kernel does not support interrupt remapping.
 782  *    In order to support broadcast without interrupt remapping, x2APIC
 783  *    rewrites the destination of non-IPI messages from APIC_BROADCAST
 784  *    to X2APIC_BROADCAST.
 785  *
 786  * The broadcast quirk can be disabled with KVM_CAP_X2APIC_API.  This is
 787  * important when userspace wants to use x2APIC-format MSIs, because
 788  * APIC_BROADCAST (0xff) is a legal route for "cluster 0, CPUs 0-7".
 789  */
 790 static u32 kvm_apic_mda(struct kvm_vcpu *vcpu, unsigned int dest_id,
 791                 struct kvm_lapic *source, struct kvm_lapic *target)
 792 {
 793         bool ipi = source != NULL;
 794
 795         if (!vcpu->kvm->arch.x2apic_broadcast_quirk_disabled &&
 796             !ipi && dest_id == APIC_BROADCAST && apic_x2apic_mode(target))
 797                 return X2APIC_BROADCAST;
 798
 799         return dest_id;
 800 }
 801
 802 bool kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
 803                            int short_hand, unsigned int dest, int dest_mode)
 804 {
 805         struct kvm_lapic *target = vcpu->arch.apic;
 806         u32 mda = kvm_apic_mda(vcpu, dest, source, target);
 807
 808         apic_debug("target %p, source %p, dest 0x%x, "
 809                    "dest_mode 0x%x, short_hand 0x%x\n",
 810                    target, source, dest, dest_mode, short_hand);
 811
 812         ASSERT(target);
 813         switch (short_hand) {
 814         case APIC_DEST_NOSHORT:
 815                 if (dest_mode == APIC_DEST_PHYSICAL)
 816                         return kvm_apic_match_physical_addr(target, mda);
 817                 else
 818                         return kvm_apic_match_logical_addr(target, mda);
 819         case APIC_DEST_SELF:
 820                 return target == source;
 821         case APIC_DEST_ALLINC:
 822                 return true;
 823         case APIC_DEST_ALLBUT:
 824                 return target != source;
 825         default:
 826                 apic_debug("kvm: apic: Bad dest shorthand value %x\n",
 827                            short_hand);
 828                 return false;
 829         }
 830 }
 831 EXPORT_SYMBOL_GPL(kvm_apic_match_dest);
 832
 833 int kvm_vector_to_index(u32 vector, u32 dest_vcpus,
 834                        const unsigned long *bitmap, u32 bitmap_size)
 835 {
 836         u32 mod;
 837         int i, idx = -1;
 838
 839         mod = vector % dest_vcpus;
 840
 841         for (i = 0; i <= mod; i++) {
 842                 idx = find_next_bit(bitmap, bitmap_size, idx + 1);
 843                 BUG_ON(idx == bitmap_size);
 844         }
 845
 846         return idx;
 847 }
 848
 849 static void kvm_apic_disabled_lapic_found(struct kvm *kvm)
 850 {
 851         if (!kvm->arch.disabled_lapic_found) {
 852                 kvm->arch.disabled_lapic_found = true;
 853                 printk(KERN_INFO
 854                        "Disabled LAPIC found during irq injection\n");
 855         }
 856 }
 857
 858 static bool kvm_apic_is_broadcast_dest(struct kvm *kvm, struct kvm_lapic **src,
 859                 struct kvm_lapic_irq *irq, struct kvm_apic_map *map)
 860 {
 861         if (kvm->arch.x2apic_broadcast_quirk_disabled) {
 862                 if ((irq->dest_id == APIC_BROADCAST &&
 863                                 map->mode != KVM_APIC_MODE_X2APIC))
 864                         return true;
 865                 if (irq->dest_id == X2APIC_BROADCAST)
 866                         return true;
 867         } else {
 868                 bool x2apic_ipi = src && *src && apic_x2apic_mode(*src);
 869                 if (irq->dest_id == (x2apic_ipi ?
 870                                      X2APIC_BROADCAST : APIC_BROADCAST))
 871                         return true;
 872         }
 873
 874         return false;
 875 }
 876
 877 /* Return true if the interrupt can be handled by using *bitmap as index mask
 878  * for valid destinations in *dst array.
 879  * Return false if kvm_apic_map_get_dest_lapic did nothing useful.
 880  * Note: we may have zero kvm_lapic destinations when we return true, which
 881  * means that the interrupt should be dropped.  In this case, *bitmap would be
 882  * zero and *dst undefined.
 883  */
 884 static inline bool kvm_apic_map_get_dest_lapic(struct kvm *kvm,
 885                 struct kvm_lapic **src, struct kvm_lapic_irq *irq,
 886                 struct kvm_apic_map *map, struct kvm_lapic ***dst,
 887                 unsigned long *bitmap)
 888 {
 889         int i, lowest;
 890
 891         if (irq->shorthand == APIC_DEST_SELF && src) {
 892                 *dst = src;
 893                 *bitmap = 1;
 894                 return true;
 895         } else if (irq->shorthand)
 896                 return false;
 897
 898         if (!map || kvm_apic_is_broadcast_dest(kvm, src, irq, map))
 899                 return false;
 900
 901         if (irq->dest_mode == APIC_DEST_PHYSICAL) {
 902                 if (irq->dest_id > map->max_apic_id) {
 903                         *bitmap = 0;
 904                 } else {
 905                         u32 dest_id = array_index_nospec(irq->dest_id, map->max_apic_id + 1);
 906                         *dst = &map->phys_map[dest_id];
 907                         *bitmap = 1;
 908                 }
 909                 return true;
 910         }
 911
 912         *bitmap = 0;
 913         if (!kvm_apic_map_get_logical_dest(map, irq->dest_id, dst,
 914                                 (u16 *)bitmap))
 915                 return false;
 916
 917         if (!kvm_lowest_prio_delivery(irq))
 918                 return true;
 919
 920         if (!kvm_vector_hashing_enabled()) {
 921                 lowest = -1;
 922                 for_each_set_bit(i, bitmap, 16) {
 923                         if (!(*dst)[i])
 924                                 continue;
 925                         if (lowest < 0)
 926                                 lowest = i;
 927                         else if (kvm_apic_compare_prio((*dst)[i]->vcpu,
 928                                                 (*dst)[lowest]->vcpu) < 0)
 929                                 lowest = i;
 930                 }
 931         } else {
 932                 if (!*bitmap)
 933                         return true;
 934
 935                 lowest = kvm_vector_to_index(irq->vector, hweight16(*bitmap),
 936                                 bitmap, 16);
 937
 938                 if (!(*dst)[lowest]) {
 939                         kvm_apic_disabled_lapic_found(kvm);
 940                         *bitmap = 0;
 941                         return true;
 942                 }
 943         }
 944
 945         *bitmap = (lowest >= 0) ? 1 << lowest : 0;
 946
 947         return true;
 948 }
 949
 950 bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
 951                 struct kvm_lapic_irq *irq, int *r, struct dest_map *dest_map)
 952 {
 953         struct kvm_apic_map *map;
 954         unsigned long bitmap;
 955         struct kvm_lapic **dst = NULL;
 956         int i;
 957         bool ret;
 958
 959         *r = -1;
 960
 961         if (irq->shorthand == APIC_DEST_SELF) {
 962                 *r = kvm_apic_set_irq(src->vcpu, irq, dest_map);
 963                 return true;
 964         }
 965
 966         rcu_read_lock();
 967         map = rcu_dereference(kvm->arch.apic_map);
 968
 969         ret = kvm_apic_map_get_dest_lapic(kvm, &src, irq, map, &dst, &bitmap);
 970         if (ret) {
 971                 *r = 0;
 972                 for_each_set_bit(i, &bitmap, 16) {
 973                         if (!dst[i])
 974                                 continue;
 975                         *r += kvm_apic_set_irq(dst[i]->vcpu, irq, dest_map);
 976                 }
 977         }
 978
 979         rcu_read_unlock();
 980         return ret;
 981 }
 982
 983 /*
 984  * This routine tries to handler interrupts in posted mode, here is how
 985  * it deals with different cases:
 986  * - For single-destination interrupts, handle it in posted mode
 987  * - Else if vector hashing is enabled and it is a lowest-priority
 988  *   interrupt, handle it in posted mode and use the following mechanism
 989  *   to find the destinaiton vCPU.
 990  *      1. For lowest-priority interrupts, store all the possible
 991  *         destination vCPUs in an array.
 992  *      2. Use "guest vector % max number of destination vCPUs" to find
 993  *         the right destination vCPU in the array for the lowest-priority
 994  *         interrupt.
 995  * - Otherwise, use remapped mode to inject the interrupt.
 996  */
 997 bool kvm_intr_is_single_vcpu_fast(struct kvm *kvm, struct kvm_lapic_irq *irq,
 998                         struct kvm_vcpu **dest_vcpu)
 999 {
1000         struct kvm_apic_map *map;
1001         unsigned long bitmap;
1002         struct kvm_lapic **dst = NULL;
1003         bool ret = false;
1004
1005         if (irq->shorthand)
1006                 return false;
1007
1008         rcu_read_lock();
1009         map = rcu_dereference(kvm->arch.apic_map);
1010
1011         if (kvm_apic_map_get_dest_lapic(kvm, NULL, irq, map, &dst, &bitmap) &&
1012                         hweight16(bitmap) == 1) {
1013                 unsigned long i = find_first_bit(&bitmap, 16);
1014
1015                 if (dst[i]) {
1016                         *dest_vcpu = dst[i]->vcpu;
1017                         ret = true;
1018                 }
1019         }
1020
1021         rcu_read_unlock();
1022         return ret;
1023 }
1024
1025 /*
1026  * Add a pending IRQ into lapic.
1027  * Return 1 if successfully added and 0 if discarded.
1028  */
1029 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
1030                              int vector, int level, int trig_mode,
1031                              struct dest_map *dest_map)
1032 {
1033         int result = 0;
1034         struct kvm_vcpu *vcpu = apic->vcpu;
1035
1036         trace_kvm_apic_accept_irq(vcpu->vcpu_id, delivery_mode,
1037                                   trig_mode, vector);
1038         switch (delivery_mode) {
1039         case APIC_DM_LOWEST:
1040                 vcpu->arch.apic_arb_prio++;
1041                 /* fall through */
1042         case APIC_DM_FIXED:
1043                 if (unlikely(trig_mode && !level))
1044                         break;
1045
1046                 /* FIXME add logic for vcpu on reset */
1047                 if (unlikely(!apic_enabled(apic)))
1048                         break;
1049
1050                 result = 1;
1051
1052                 if (dest_map) {
1053                         __set_bit(vcpu->vcpu_id, dest_map->map);
1054                         dest_map->vectors[vcpu->vcpu_id] = vector;
1055                 }
1056
1057                 if (apic_test_vector(vector, apic->regs + APIC_TMR) != !!trig_mode) {
1058                         if (trig_mode)
1059                                 kvm_lapic_set_vector(vector, apic->regs + APIC_TMR);
1060                         else
1061                                 apic_clear_vector(vector, apic->regs + APIC_TMR);
1062                 }
1063
1064                 if (vcpu->arch.apicv_active)
1065                         kvm_x86_ops->deliver_posted_interrupt(vcpu, vector);
1066                 else {
1067                         kvm_lapic_set_irr(vector, apic);
1068
1069                         kvm_make_request(KVM_REQ_EVENT, vcpu);
1070                         kvm_vcpu_kick(vcpu);
1071                 }
1072                 break;
1073
1074         case APIC_DM_REMRD:
1075                 result = 1;
1076                 vcpu->arch.pv.pv_unhalted = 1;
1077                 kvm_make_request(KVM_REQ_EVENT, vcpu);
1078                 kvm_vcpu_kick(vcpu);
1079                 break;
1080
1081         case APIC_DM_SMI:
1082                 result = 1;
1083                 kvm_make_request(KVM_REQ_SMI, vcpu);
1084                 kvm_vcpu_kick(vcpu);
1085                 break;
1086
1087         case APIC_DM_NMI:
1088                 result = 1;
1089                 kvm_inject_nmi(vcpu);
1090                 kvm_vcpu_kick(vcpu);
1091                 break;
1092
1093         case APIC_DM_INIT:
1094                 if (!trig_mode || level) {
1095                         result = 1;
1096                         /* assumes that there are only KVM_APIC_INIT/SIPI */
1097                         apic->pending_events = (1UL << KVM_APIC_INIT);
1098                         /* make sure pending_events is visible before sending
1099                          * the request */
1100                         smp_wmb();
1101                         kvm_make_request(KVM_REQ_EVENT, vcpu);
1102                         kvm_vcpu_kick(vcpu);
1103                 } else {
1104                         apic_debug("Ignoring de-assert INIT to vcpu %d\n",
1105                                    vcpu->vcpu_id);
1106                 }
1107                 break;
1108
1109         case APIC_DM_STARTUP:
1110                 apic_debug("SIPI to vcpu %d vector 0x%02x\n",
1111                            vcpu->vcpu_id, vector);
1112                 result = 1;
1113                 apic->sipi_vector = vector;
1114                 /* make sure sipi_vector is visible for the receiver */
1115                 smp_wmb();
1116                 set_bit(KVM_APIC_SIPI, &apic->pending_events);
1117                 kvm_make_request(KVM_REQ_EVENT, vcpu);
1118                 kvm_vcpu_kick(vcpu);
1119                 break;
1120
1121         case APIC_DM_EXTINT:
1122                 /*
1123                  * Should only be called by kvm_apic_local_deliver() with LVT0,
1124                  * before NMI watchdog was enabled. Already handled by
1125                  * kvm_apic_accept_pic_intr().
1126                  */
1127                 break;
1128
1129         default:
1130                 printk(KERN_ERR "TODO: unsupported delivery mode %x\n",
1131                        delivery_mode);
1132                 break;
1133         }
1134         return result;
1135 }
1136
1137 int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2)
1138 {
1139         return vcpu1->arch.apic_arb_prio - vcpu2->arch.apic_arb_prio;
1140 }
1141
1142 static bool kvm_ioapic_handles_vector(struct kvm_lapic *apic, int vector)
1143 {
1144         return test_bit(vector, apic->vcpu->arch.ioapic_handled_vectors);
1145 }
1146
1147 static void kvm_ioapic_send_eoi(struct kvm_lapic *apic, int vector)
1148 {
1149         int trigger_mode;
1150
1151         /* Eoi the ioapic only if the ioapic doesn't own the vector. */
1152         if (!kvm_ioapic_handles_vector(apic, vector))
1153                 return;
1154
1155         /* Request a KVM exit to inform the userspace IOAPIC. */
1156         if (irqchip_split(apic->vcpu->kvm)) {
1157                 apic->vcpu->arch.pending_ioapic_eoi = vector;
1158                 kvm_make_request(KVM_REQ_IOAPIC_EOI_EXIT, apic->vcpu);
1159                 return;
1160         }
1161
1162         if (apic_test_vector(vector, apic->regs + APIC_TMR))
1163                 trigger_mode = IOAPIC_LEVEL_TRIG;
1164         else
1165                 trigger_mode = IOAPIC_EDGE_TRIG;
1166
1167         kvm_ioapic_update_eoi(apic->vcpu, vector, trigger_mode);
1168 }
1169
1170 static int apic_set_eoi(struct kvm_lapic *apic)
1171 {
1172         int vector = apic_find_highest_isr(apic);
1173
1174         trace_kvm_eoi(apic, vector);
1175
1176         /*
1177          * Not every write EOI will has corresponding ISR,
1178          * one example is when Kernel check timer on setup_IO_APIC
1179          */
1180         if (vector == -1)
1181                 return vector;
1182
1183         apic_clear_isr(vector, apic);
1184         apic_update_ppr(apic);
1185
1186         if (test_bit(vector, vcpu_to_synic(apic->vcpu)->vec_bitmap))
1187                 kvm_hv_synic_send_eoi(apic->vcpu, vector);
1188
1189         kvm_ioapic_send_eoi(apic, vector);
1190         kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
1191         return vector;
1192 }
1193
1194 /*
1195  * this interface assumes a trap-like exit, which has already finished
1196  * desired side effect including vISR and vPPR update.
1197  */
1198 void kvm_apic_set_eoi_accelerated(struct kvm_vcpu *vcpu, int vector)
1199 {
1200         struct kvm_lapic *apic = vcpu->arch.apic;
1201
1202         trace_kvm_eoi(apic, vector);
1203
1204         kvm_ioapic_send_eoi(apic, vector);
1205         kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
1206 }
1207 EXPORT_SYMBOL_GPL(kvm_apic_set_eoi_accelerated);
1208
1209 static void apic_send_ipi(struct kvm_lapic *apic)
1210 {
1211         u32 icr_low = kvm_lapic_get_reg(apic, APIC_ICR);
1212         u32 icr_high = kvm_lapic_get_reg(apic, APIC_ICR2);
1213         struct kvm_lapic_irq irq;
1214
1215         irq.vector = icr_low & APIC_VECTOR_MASK;
1216         irq.delivery_mode = icr_low & APIC_MODE_MASK;
1217         irq.dest_mode = icr_low & APIC_DEST_MASK;
1218         irq.level = (icr_low & APIC_INT_ASSERT) != 0;
1219         irq.trig_mode = icr_low & APIC_INT_LEVELTRIG;
1220         irq.shorthand = icr_low & APIC_SHORT_MASK;
1221         irq.msi_redir_hint = false;
1222         if (apic_x2apic_mode(apic))
1223                 irq.dest_id = icr_high;
1224         else
1225                 irq.dest_id = GET_APIC_DEST_FIELD(icr_high);
1226
1227         trace_kvm_apic_ipi(icr_low, irq.dest_id);
1228
1229         apic_debug("icr_high 0x%x, icr_low 0x%x, "
1230                    "short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
1231                    "dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x, "
1232                    "msi_redir_hint 0x%x\n",
1233                    icr_high, icr_low, irq.shorthand, irq.dest_id,
1234                    irq.trig_mode, irq.level, irq.dest_mode, irq.delivery_mode,
1235                    irq.vector, irq.msi_redir_hint);
1236
1237         kvm_irq_delivery_to_apic(apic->vcpu->kvm, apic, &irq, NULL);
1238 }
1239
1240 static u32 apic_get_tmcct(struct kvm_lapic *apic)
1241 {
1242         ktime_t remaining, now;
1243         s64 ns;
1244         u32 tmcct;
1245
1246         ASSERT(apic != NULL);
1247
1248         /* if initial count is 0, current count should also be 0 */
1249         if (kvm_lapic_get_reg(apic, APIC_TMICT) == 0 ||
1250                 apic->lapic_timer.period == 0)
1251                 return 0;
1252
1253         now = ktime_get();
1254         remaining = ktime_sub(apic->lapic_timer.target_expiration, now);
1255         if (ktime_to_ns(remaining) < 0)
1256                 remaining = 0;
1257
1258         ns = mod_64(ktime_to_ns(remaining), apic->lapic_timer.period);
1259         tmcct = div64_u64(ns,
1260                          (APIC_BUS_CYCLE_NS * apic->divide_count));
1261
1262         return tmcct;
1263 }
1264
1265 static void __report_tpr_access(struct kvm_lapic *apic, bool write)
1266 {
1267         struct kvm_vcpu *vcpu = apic->vcpu;
1268         struct kvm_run *run = vcpu->run;
1269
1270         kvm_make_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu);
1271         run->tpr_access.rip = kvm_rip_read(vcpu);
1272         run->tpr_access.is_write = write;
1273 }
1274
1275 static inline void report_tpr_access(struct kvm_lapic *apic, bool write)
1276 {
1277         if (apic->vcpu->arch.tpr_access_reporting)
1278                 __report_tpr_access(apic, write);
1279 }
1280
1281 static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset)
1282 {
1283         u32 val = 0;
1284
1285         if (offset >= LAPIC_MMIO_LENGTH)
1286                 return 0;
1287
1288         switch (offset) {
1289         case APIC_ARBPRI:
1290                 apic_debug("Access APIC ARBPRI register which is for P6\n");
1291                 break;
1292
1293         case APIC_TMCCT:        /* Timer CCR */
1294                 if (apic_lvtt_tscdeadline(apic))
1295                         return 0;
1296
1297                 val = apic_get_tmcct(apic);
1298                 break;
1299         case APIC_PROCPRI:
1300                 apic_update_ppr(apic);
1301                 val = kvm_lapic_get_reg(apic, offset);
1302                 break;
1303         case APIC_TASKPRI:
1304                 report_tpr_access(apic, false);
1305                 /* fall thru */
1306         default:
1307                 val = kvm_lapic_get_reg(apic, offset);
1308                 break;
1309         }
1310
1311         return val;
1312 }
1313
1314 static inline struct kvm_lapic *to_lapic(struct kvm_io_device *dev)
1315 {
1316         return container_of(dev, struct kvm_lapic, dev);
1317 }
1318
1319 int kvm_lapic_reg_read(struct kvm_lapic *apic, u32 offset, int len,
1320                 void *data)
1321 {
1322         unsigned char alignment = offset & 0xf;
1323         u32 result;
1324         /* this bitmask has a bit cleared for each reserved register */
1325         static const u64 rmask = 0x43ff01ffffffe70cULL;
1326
1327         if ((alignment + len) > 4) {
1328                 apic_debug("KVM_APIC_READ: alignment error %x %d\n",
1329                            offset, len);
1330                 return 1;
1331         }
1332
1333         if (offset > 0x3f0 || !(rmask & (1ULL << (offset >> 4)))) {
1334                 apic_debug("KVM_APIC_READ: read reserved register %x\n",
1335                            offset);
1336                 return 1;
1337         }
1338
1339         result = __apic_read(apic, offset & ~0xf);
1340
1341         trace_kvm_apic_read(offset, result);
1342
1343         switch (len) {
1344         case 1:
1345         case 2:
1346         case 4:
1347                 memcpy(data, (char *)&result + alignment, len);
1348                 break;
1349         default:
1350                 printk(KERN_ERR "Local APIC read with len = %x, "
1351                        "should be 1,2, or 4 instead\n", len);
1352                 break;
1353         }
1354         return 0;
1355 }
1356 EXPORT_SYMBOL_GPL(kvm_lapic_reg_read);
1357
1358 static int apic_mmio_in_range(struct kvm_lapic *apic, gpa_t addr)
1359 {
1360         return addr >= apic->base_address &&
1361                 addr < apic->base_address + LAPIC_MMIO_LENGTH;
1362 }
1363
1364 static int apic_mmio_read(struct kvm_vcpu *vcpu, struct kvm_io_device *this,
1365                            gpa_t address, int len, void *data)
1366 {
1367         struct kvm_lapic *apic = to_lapic(this);
1368         u32 offset = address - apic->base_address;
1369
1370         if (!apic_mmio_in_range(apic, address))
1371                 return -EOPNOTSUPP;
1372
1373         if (!kvm_apic_hw_enabled(apic) || apic_x2apic_mode(apic)) {
1374                 if (!kvm_check_has_quirk(vcpu->kvm,
1375                                          KVM_X86_QUIRK_LAPIC_MMIO_HOLE))
1376                         return -EOPNOTSUPP;
1377
1378                 memset(data, 0xff, len);
1379                 return 0;
1380         }
1381
1382         kvm_lapic_reg_read(apic, offset, len, data);
1383
1384         return 0;
1385 }
1386
1387 static void update_divide_count(struct kvm_lapic *apic)
1388 {
1389         u32 tmp1, tmp2, tdcr;
1390
1391         tdcr = kvm_lapic_get_reg(apic, APIC_TDCR);
1392         tmp1 = tdcr & 0xf;
1393         tmp2 = ((tmp1 & 0x3) | ((tmp1 & 0x8) >> 1)) + 1;
1394         apic->divide_count = 0x1 << (tmp2 & 0x7);
1395
1396         apic_debug("timer divide count is 0x%x\n",
1397                                    apic->divide_count);
1398 }
1399
1400 static void limit_periodic_timer_frequency(struct kvm_lapic *apic)
1401 {
1402         /*
1403          * Do not allow the guest to program periodic timers with small
1404          * interval, since the hrtimers are not throttled by the host
1405          * scheduler.
1406          */
1407         if (apic_lvtt_period(apic) && apic->lapic_timer.period) {
1408                 s64 min_period = min_timer_period_us * 1000LL;
1409
1410                 if (apic->lapic_timer.period < min_period) {
1411                         pr_info_ratelimited(
1412                             "kvm: vcpu %i: requested %lld ns "
1413                             "lapic timer period limited to %lld ns\n",
1414                             apic->vcpu->vcpu_id,
1415                             apic->lapic_timer.period, min_period);
1416                         apic->lapic_timer.period = min_period;
1417                 }
1418         }
1419 }
1420
1421 static void apic_update_lvtt(struct kvm_lapic *apic)
1422 {
1423         u32 timer_mode = kvm_lapic_get_reg(apic, APIC_LVTT) &
1424                         apic->lapic_timer.timer_mode_mask;
1425
1426         if (apic->lapic_timer.timer_mode != timer_mode) {
1427                 if (apic_lvtt_tscdeadline(apic) != (timer_mode ==
1428                                 APIC_LVT_TIMER_TSCDEADLINE)) {
1429                         hrtimer_cancel(&apic->lapic_timer.timer);
1430                         kvm_lapic_set_reg(apic, APIC_TMICT, 0);
1431                         apic->lapic_timer.period = 0;
1432                         apic->lapic_timer.tscdeadline = 0;
1433                 }
1434                 apic->lapic_timer.timer_mode = timer_mode;
1435                 limit_periodic_timer_frequency(apic);
1436         }
1437 }
1438
1439 static void apic_timer_expired(struct kvm_lapic *apic)
1440 {
1441         struct kvm_vcpu *vcpu = apic->vcpu;
1442         struct swait_queue_head *q = &vcpu->wq;
1443         struct kvm_timer *ktimer = &apic->lapic_timer;
1444
1445         if (atomic_read(&apic->lapic_timer.pending))
1446                 return;
1447
1448         atomic_inc(&apic->lapic_timer.pending);
1449         kvm_set_pending_timer(vcpu);
1450
1451         /*
1452          * For x86, the atomic_inc() is serialized, thus
1453          * using swait_active() is safe.
1454          */
1455         if (swait_active(q))
1456                 swake_up_one(q);
1457
1458         if (apic_lvtt_tscdeadline(apic) || ktimer->hv_timer_in_use)
1459                 ktimer->expired_tscdeadline = ktimer->tscdeadline;
1460 }
1461
1462 /*
1463  * On APICv, this test will cause a busy wait
1464  * during a higher-priority task.
1465  */
1466
1467 static bool lapic_timer_int_injected(struct kvm_vcpu *vcpu)
1468 {
1469         struct kvm_lapic *apic = vcpu->arch.apic;
1470         u32 reg = kvm_lapic_get_reg(apic, APIC_LVTT);
1471
1472         if (kvm_apic_hw_enabled(apic)) {
1473                 int vec = reg & APIC_VECTOR_MASK;
1474                 void *bitmap = apic->regs + APIC_ISR;
1475
1476                 if (vcpu->arch.apicv_active)
1477                         bitmap = apic->regs + APIC_IRR;
1478
1479                 if (apic_test_vector(vec, bitmap))
1480                         return true;
1481         }
1482         return false;
1483 }
1484
1485 void wait_lapic_expire(struct kvm_vcpu *vcpu)
1486 {
1487         struct kvm_lapic *apic = vcpu->arch.apic;
1488         u64 guest_tsc, tsc_deadline, ns;
1489
1490         if (!lapic_in_kernel(vcpu))
1491                 return;
1492
1493         if (apic->lapic_timer.expired_tscdeadline == 0)
1494                 return;
1495
1496         if (!lapic_timer_int_injected(vcpu))
1497                 return;
1498
1499         tsc_deadline = apic->lapic_timer.expired_tscdeadline;
1500         apic->lapic_timer.expired_tscdeadline = 0;
1501         guest_tsc = kvm_read_l1_tsc(vcpu, rdtsc());
1502         trace_kvm_wait_lapic_expire(vcpu->vcpu_id, guest_tsc - tsc_deadline);
1503
1504         /* __delay is delay_tsc whenever the hardware has TSC, thus always.  */
1505         if (guest_tsc < tsc_deadline)
1506                 __delay(min(tsc_deadline - guest_tsc,
1507                         nsec_to_cycles(vcpu, lapic_timer_advance_ns)));
1508
1509         if (!lapic_timer_advance_adjust_done) {
1510                 /* too early */
1511                 if (guest_tsc < tsc_deadline) {
1512                         ns = (tsc_deadline - guest_tsc) * 1000000ULL;
1513                         do_div(ns, vcpu->arch.virtual_tsc_khz);
1514                         lapic_timer_advance_ns -= min((unsigned int)ns,
1515                                 lapic_timer_advance_ns / LAPIC_TIMER_ADVANCE_ADJUST_STEP);
1516                 } else {
1517                 /* too late */
1518                         ns = (guest_tsc - tsc_deadline) * 1000000ULL;
1519                         do_div(ns, vcpu->arch.virtual_tsc_khz);
1520                         lapic_timer_advance_ns += min((unsigned int)ns,
1521                                 lapic_timer_advance_ns / LAPIC_TIMER_ADVANCE_ADJUST_STEP);
1522                 }
1523                 if (abs(guest_tsc - tsc_deadline) < LAPIC_TIMER_ADVANCE_ADJUST_DONE)
1524                         lapic_timer_advance_adjust_done = true;
1525         }
1526 }
1527
1528 static void start_sw_tscdeadline(struct kvm_lapic *apic)
1529 {
1530         u64 guest_tsc, tscdeadline = apic->lapic_timer.tscdeadline;
1531         u64 ns = 0;
1532         ktime_t expire;
1533         struct kvm_vcpu *vcpu = apic->vcpu;
1534         unsigned long this_tsc_khz = vcpu->arch.virtual_tsc_khz;
1535         unsigned long flags;
1536         ktime_t now;
1537
1538         if (unlikely(!tscdeadline || !this_tsc_khz))
1539                 return;
1540
1541         local_irq_save(flags);
1542
1543         now = ktime_get();
1544         guest_tsc = kvm_read_l1_tsc(vcpu, rdtsc());
1545         if (likely(tscdeadline > guest_tsc)) {
1546                 ns = (tscdeadline - guest_tsc) * 1000000ULL;
1547                 do_div(ns, this_tsc_khz);
1548                 expire = ktime_add_ns(now, ns);
1549                 expire = ktime_sub_ns(expire, lapic_timer_advance_ns);
1550                 hrtimer_start(&apic->lapic_timer.timer,
1551                                 expire, HRTIMER_MODE_ABS_PINNED);
1552         } else
1553                 apic_timer_expired(apic);
1554
1555         local_irq_restore(flags);
1556 }
1557
1558 static void update_target_expiration(struct kvm_lapic *apic, uint32_t old_divisor)
1559 {
1560         ktime_t now, remaining;
1561         u64 ns_remaining_old, ns_remaining_new;
1562
1563         apic->lapic_timer.period = (u64)kvm_lapic_get_reg(apic, APIC_TMICT)
1564                 * APIC_BUS_CYCLE_NS * apic->divide_count;
1565         limit_periodic_timer_frequency(apic);
1566
1567         now = ktime_get();
1568         remaining = ktime_sub(apic->lapic_timer.target_expiration, now);
1569         if (ktime_to_ns(remaining) < 0)
1570                 remaining = 0;
1571
1572         ns_remaining_old = ktime_to_ns(remaining);
1573         ns_remaining_new = mul_u64_u32_div(ns_remaining_old,
1574                                            apic->divide_count, old_divisor);
1575
1576         apic->lapic_timer.tscdeadline +=
1577                 nsec_to_cycles(apic->vcpu, ns_remaining_new) -
1578                 nsec_to_cycles(apic->vcpu, ns_remaining_old);
1579         apic->lapic_timer.target_expiration = ktime_add_ns(now, ns_remaining_new);
1580 }
1581
1582 static bool set_target_expiration(struct kvm_lapic *apic)
1583 {
1584         ktime_t now;
1585         u64 tscl = rdtsc();
1586
1587         now = ktime_get();
1588         apic->lapic_timer.period = (u64)kvm_lapic_get_reg(apic, APIC_TMICT)
1589                 * APIC_BUS_CYCLE_NS * apic->divide_count;
1590
1591         if (!apic->lapic_timer.period) {
1592                 apic->lapic_timer.tscdeadline = 0;
1593                 return false;
1594         }
1595
1596         limit_periodic_timer_frequency(apic);
1597
1598         apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016"
1599                    PRIx64 ", "
1600                    "timer initial count 0x%x, period %lldns, "
1601                    "expire @ 0x%016" PRIx64 ".\n", __func__,
1602                    APIC_BUS_CYCLE_NS, ktime_to_ns(now),
1603                    kvm_lapic_get_reg(apic, APIC_TMICT),
1604                    apic->lapic_timer.period,
1605                    ktime_to_ns(ktime_add_ns(now,
1606                                 apic->lapic_timer.period)));
1607
1608         apic->lapic_timer.tscdeadline = kvm_read_l1_tsc(apic->vcpu, tscl) +
1609                 nsec_to_cycles(apic->vcpu, apic->lapic_timer.period);
1610         apic->lapic_timer.target_expiration = ktime_add_ns(now, apic->lapic_timer.period);
1611
1612         return true;
1613 }
1614
1615 static void advance_periodic_target_expiration(struct kvm_lapic *apic)
1616 {
1617         ktime_t now = ktime_get();
1618         u64 tscl = rdtsc();
1619         ktime_t delta;
1620
1621         /*
1622          * Synchronize both deadlines to the same time source or
1623          * differences in the periods (caused by differences in the
1624          * underlying clocks or numerical approximation errors) will
1625          * cause the two to drift apart over time as the errors
1626          * accumulate.
1627          */
1628         apic->lapic_timer.target_expiration =
1629                 ktime_add_ns(apic->lapic_timer.target_expiration,
1630                                 apic->lapic_timer.period);
1631         delta = ktime_sub(apic->lapic_timer.target_expiration, now);
1632         apic->lapic_timer.tscdeadline = kvm_read_l1_tsc(apic->vcpu, tscl) +
1633                 nsec_to_cycles(apic->vcpu, delta);
1634 }
1635
1636 static void start_sw_period(struct kvm_lapic *apic)
1637 {
1638         if (!apic->lapic_timer.period)
1639                 return;
1640
1641         if (ktime_after(ktime_get(),
1642                         apic->lapic_timer.target_expiration)) {
1643                 apic_timer_expired(apic);
1644
1645                 if (apic_lvtt_oneshot(apic))
1646                         return;
1647
1648                 advance_periodic_target_expiration(apic);
1649         }
1650
1651         hrtimer_start(&apic->lapic_timer.timer,
1652                 apic->lapic_timer.target_expiration,
1653                 HRTIMER_MODE_ABS_PINNED);
1654 }
1655
1656 bool kvm_lapic_hv_timer_in_use(struct kvm_vcpu *vcpu)
1657 {
1658         if (!lapic_in_kernel(vcpu))
1659                 return false;
1660
1661         return vcpu->arch.apic->lapic_timer.hv_timer_in_use;
1662 }
1663 EXPORT_SYMBOL_GPL(kvm_lapic_hv_timer_in_use);
1664
1665 static void cancel_hv_timer(struct kvm_lapic *apic)
1666 {
1667         WARN_ON(preemptible());
1668         WARN_ON(!apic->lapic_timer.hv_timer_in_use);
1669         kvm_x86_ops->cancel_hv_timer(apic->vcpu);
1670         apic->lapic_timer.hv_timer_in_use = false;
1671 }
1672
1673 static bool start_hv_timer(struct kvm_lapic *apic)
1674 {
1675         struct kvm_timer *ktimer = &apic->lapic_timer;
1676         int r;
1677
1678         WARN_ON(preemptible());
1679         if (!kvm_x86_ops->set_hv_timer)
1680                 return false;
1681
1682         if (!apic_lvtt_period(apic) && atomic_read(&ktimer->pending))
1683                 return false;
1684
1685         if (!ktimer->tscdeadline)
1686                 return false;
1687
1688         r = kvm_x86_ops->set_hv_timer(apic->vcpu, ktimer->tscdeadline);
1689         if (r < 0)
1690                 return false;
1691
1692         ktimer->hv_timer_in_use = true;
1693         hrtimer_cancel(&ktimer->timer);
1694
1695         /*
1696          * Also recheck ktimer->pending, in case the sw timer triggered in
1697          * the window.  For periodic timer, leave the hv timer running for
1698          * simplicity, and the deadline will be recomputed on the next vmexit.
1699          */
1700         if (!apic_lvtt_period(apic) && (r || atomic_read(&ktimer->pending))) {
1701                 if (r)
1702                         apic_timer_expired(apic);
1703                 return false;
1704         }
1705
1706         trace_kvm_hv_timer_state(apic->vcpu->vcpu_id, true);
1707         return true;
1708 }
1709
1710 static void start_sw_timer(struct kvm_lapic *apic)
1711 {
1712         struct kvm_timer *ktimer = &apic->lapic_timer;
1713
1714         WARN_ON(preemptible());
1715         if (apic->lapic_timer.hv_timer_in_use)
1716                 cancel_hv_timer(apic);
1717         if (!apic_lvtt_period(apic) && atomic_read(&ktimer->pending))
1718                 return;
1719
1720         if (apic_lvtt_period(apic) || apic_lvtt_oneshot(apic))
1721                 start_sw_period(apic);
1722         else if (apic_lvtt_tscdeadline(apic))
1723                 start_sw_tscdeadline(apic);
1724         trace_kvm_hv_timer_state(apic->vcpu->vcpu_id, false);
1725 }
1726
1727 static void restart_apic_timer(struct kvm_lapic *apic)
1728 {
1729         preempt_disable();
1730         if (!start_hv_timer(apic))
1731                 start_sw_timer(apic);
1732         preempt_enable();
1733 }
1734
1735 void kvm_lapic_expired_hv_timer(struct kvm_vcpu *vcpu)
1736 {
1737         struct kvm_lapic *apic = vcpu->arch.apic;
1738
1739         preempt_disable();
1740         /* If the preempt notifier has already run, it also called apic_timer_expired */
1741         if (!apic->lapic_timer.hv_timer_in_use)
1742                 goto out;
1743         WARN_ON(swait_active(&vcpu->wq));
1744         cancel_hv_timer(apic);
1745         apic_timer_expired(apic);
1746
1747         if (apic_lvtt_period(apic) && apic->lapic_timer.period) {
1748                 advance_periodic_target_expiration(apic);
1749                 restart_apic_timer(apic);
1750         }
1751 out:
1752         preempt_enable();
1753 }
1754 EXPORT_SYMBOL_GPL(kvm_lapic_expired_hv_timer);
1755
1756 void kvm_lapic_switch_to_hv_timer(struct kvm_vcpu *vcpu)
1757 {
1758         restart_apic_timer(vcpu->arch.apic);
1759 }
1760 EXPORT_SYMBOL_GPL(kvm_lapic_switch_to_hv_timer);
1761
1762 void kvm_lapic_switch_to_sw_timer(struct kvm_vcpu *vcpu)
1763 {
1764         struct kvm_lapic *apic = vcpu->arch.apic;
1765
1766         preempt_disable();
1767         /* Possibly the TSC deadline timer is not enabled yet */
1768         if (apic->lapic_timer.hv_timer_in_use)
1769                 start_sw_timer(apic);
1770         preempt_enable();
1771 }
1772 EXPORT_SYMBOL_GPL(kvm_lapic_switch_to_sw_timer);
1773
1774 void kvm_lapic_restart_hv_timer(struct kvm_vcpu *vcpu)
1775 {
1776         struct kvm_lapic *apic = vcpu->arch.apic;
1777
1778         WARN_ON(!apic->lapic_timer.hv_timer_in_use);
1779         restart_apic_timer(apic);
1780 }
1781
1782 static void start_apic_timer(struct kvm_lapic *apic)
1783 {
1784         atomic_set(&apic->lapic_timer.pending, 0);
1785
1786         if ((apic_lvtt_period(apic) || apic_lvtt_oneshot(apic))
1787             && !set_target_expiration(apic))
1788                 return;
1789
1790         restart_apic_timer(apic);
1791 }
1792
1793 static void apic_manage_nmi_watchdog(struct kvm_lapic *apic, u32 lvt0_val)
1794 {
1795         bool lvt0_in_nmi_mode = apic_lvt_nmi_mode(lvt0_val);
1796
1797         if (apic->lvt0_in_nmi_mode != lvt0_in_nmi_mode) {
1798                 apic->lvt0_in_nmi_mode = lvt0_in_nmi_mode;
1799                 if (lvt0_in_nmi_mode) {
1800                         apic_debug("Receive NMI setting on APIC_LVT0 "
1801                                    "for cpu %d\n", apic->vcpu->vcpu_id);
1802                         atomic_inc(&apic->vcpu->kvm->arch.vapics_in_nmi_mode);
1803                 } else
1804                         atomic_dec(&apic->vcpu->kvm->arch.vapics_in_nmi_mode);
1805         }
1806 }
1807
1808 int kvm_lapic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val)
1809 {
1810         int ret = 0;
1811
1812         trace_kvm_apic_write(reg, val);
1813
1814         switch (reg) {
1815         case APIC_ID:           /* Local APIC ID */
1816                 if (!apic_x2apic_mode(apic))
1817                         kvm_apic_set_xapic_id(apic, val >> 24);
1818                 else
1819                         ret = 1;
1820                 break;
1821
1822         case APIC_TASKPRI:
1823                 report_tpr_access(apic, true);
1824                 apic_set_tpr(apic, val & 0xff);
1825                 break;
1826
1827         case APIC_EOI:
1828                 apic_set_eoi(apic);
1829                 break;
1830
1831         case APIC_LDR:
1832                 if (!apic_x2apic_mode(apic))
1833                         kvm_apic_set_ldr(apic, val & APIC_LDR_MASK);
1834                 else
1835                         ret = 1;
1836                 break;
1837
1838         case APIC_DFR:
1839                 if (!apic_x2apic_mode(apic)) {
1840                         kvm_lapic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
1841                         recalculate_apic_map(apic->vcpu->kvm);
1842                 } else
1843                         ret = 1;
1844                 break;
1845
1846         case APIC_SPIV: {
1847                 u32 mask = 0x3ff;
1848                 if (kvm_lapic_get_reg(apic, APIC_LVR) & APIC_LVR_DIRECTED_EOI)
1849                         mask |= APIC_SPIV_DIRECTED_EOI;
1850                 apic_set_spiv(apic, val & mask);
1851                 if (!(val & APIC_SPIV_APIC_ENABLED)) {
1852                         int i;
1853                         u32 lvt_val;
1854
1855                         for (i = 0; i < KVM_APIC_LVT_NUM; i++) {
1856                                 lvt_val = kvm_lapic_get_reg(apic,
1857                                                        APIC_LVTT + 0x10 * i);
1858                                 kvm_lapic_set_reg(apic, APIC_LVTT + 0x10 * i,
1859                                              lvt_val | APIC_LVT_MASKED);
1860                         }
1861                         apic_update_lvtt(apic);
1862                         atomic_set(&apic->lapic_timer.pending, 0);
1863
1864                 }
1865                 break;
1866         }
1867         case APIC_ICR:
1868                 /* No delay here, so we always clear the pending bit */
1869                 kvm_lapic_set_reg(apic, APIC_ICR, val & ~(1 << 12));
1870                 apic_send_ipi(apic);
1871                 break;
1872
1873         case APIC_ICR2:
1874                 if (!apic_x2apic_mode(apic))
1875                         val &= 0xff000000;
1876                 kvm_lapic_set_reg(apic, APIC_ICR2, val);
1877                 break;
1878
1879         case APIC_LVT0:
1880                 apic_manage_nmi_watchdog(apic, val);
1881                 /* fall through */
1882         case APIC_LVTTHMR:
1883         case APIC_LVTPC:
1884         case APIC_LVT1:
1885         case APIC_LVTERR:
1886                 /* TODO: Check vector */
1887                 if (!kvm_apic_sw_enabled(apic))
1888                         val |= APIC_LVT_MASKED;
1889
1890                 val &= apic_lvt_mask[(reg - APIC_LVTT) >> 4];
1891                 kvm_lapic_set_reg(apic, reg, val);
1892
1893                 break;
1894
1895         case APIC_LVTT:
1896                 if (!kvm_apic_sw_enabled(apic))
1897                         val |= APIC_LVT_MASKED;
1898                 val &= (apic_lvt_mask[0] | apic->lapic_timer.timer_mode_mask);
1899                 kvm_lapic_set_reg(apic, APIC_LVTT, val);
1900                 apic_update_lvtt(apic);
1901                 break;
1902
1903         case APIC_TMICT:
1904                 if (apic_lvtt_tscdeadline(apic))
1905                         break;
1906
1907                 hrtimer_cancel(&apic->lapic_timer.timer);
1908                 kvm_lapic_set_reg(apic, APIC_TMICT, val);
1909                 start_apic_timer(apic);
1910                 break;
1911
1912         case APIC_TDCR: {
1913                 uint32_t old_divisor = apic->divide_count;
1914
1915                 if (val & 4)
1916                         apic_debug("KVM_WRITE:TDCR %x\n", val);
1917                 kvm_lapic_set_reg(apic, APIC_TDCR, val);
1918                 update_divide_count(apic);
1919                 if (apic->divide_count != old_divisor &&
1920                                 apic->lapic_timer.period) {
1921                         hrtimer_cancel(&apic->lapic_timer.timer);
1922                         update_target_expiration(apic, old_divisor);
1923                         restart_apic_timer(apic);
1924                 }
1925                 break;
1926         }
1927         case APIC_ESR:
1928                 if (apic_x2apic_mode(apic) && val != 0) {
1929                         apic_debug("KVM_WRITE:ESR not zero %x\n", val);
1930                         ret = 1;
1931                 }
1932                 break;
1933
1934         case APIC_SELF_IPI:
1935                 if (apic_x2apic_mode(apic)) {
1936                         kvm_lapic_reg_write(apic, APIC_ICR, 0x40000 | (val & 0xff));
1937                 } else
1938                         ret = 1;
1939                 break;
1940         default:
1941                 ret = 1;
1942                 break;
1943         }
1944         if (ret)
1945                 apic_debug("Local APIC Write to read-only register %x\n", reg);
1946         return ret;
1947 }
1948 EXPORT_SYMBOL_GPL(kvm_lapic_reg_write);
1949
1950 static int apic_mmio_write(struct kvm_vcpu *vcpu, struct kvm_io_device *this,
1951                             gpa_t address, int len, const void *data)
1952 {
1953         struct kvm_lapic *apic = to_lapic(this);
1954         unsigned int offset = address - apic->base_address;
1955         u32 val;
1956
1957         if (!apic_mmio_in_range(apic, address))
1958                 return -EOPNOTSUPP;
1959
1960         if (!kvm_apic_hw_enabled(apic) || apic_x2apic_mode(apic)) {
1961                 if (!kvm_check_has_quirk(vcpu->kvm,
1962                                          KVM_X86_QUIRK_LAPIC_MMIO_HOLE))
1963                         return -EOPNOTSUPP;
1964
1965                 return 0;
1966         }
1967
1968         /*
1969          * APIC register must be aligned on 128-bits boundary.
1970          * 32/64/128 bits registers must be accessed thru 32 bits.
1971          * Refer SDM 8.4.1
1972          */
1973         if (len != 4 || (offset & 0xf)) {
1974                 /* Don't shout loud, $infamous_os would cause only noise. */
1975                 apic_debug("apic write: bad size=%d %lx\n", len, (long)address);
1976                 return 0;
1977         }
1978
1979         val = *(u32*)data;
1980
1981         /* too common printing */
1982         if (offset != APIC_EOI)
1983                 apic_debug("%s: offset 0x%x with length 0x%x, and value is "
1984                            "0x%x\n", __func__, offset, len, val);
1985
1986         kvm_lapic_reg_write(apic, offset & 0xff0, val);
1987
1988         return 0;
1989 }
1990
1991 void kvm_lapic_set_eoi(struct kvm_vcpu *vcpu)
1992 {
1993         kvm_lapic_reg_write(vcpu->arch.apic, APIC_EOI, 0);
1994 }
1995 EXPORT_SYMBOL_GPL(kvm_lapic_set_eoi);
1996
1997 /* emulate APIC access in a trap manner */
1998 void kvm_apic_write_nodecode(struct kvm_vcpu *vcpu, u32 offset)
1999 {
2000         u32 val = 0;
2001
2002         /* hw has done the conditional check and inst decode */
2003         offset &= 0xff0;
2004
2005         kvm_lapic_reg_read(vcpu->arch.apic, offset, 4, &val);
2006
2007         /* TODO: optimize to just emulate side effect w/o one more write */
2008         kvm_lapic_reg_write(vcpu->arch.apic, offset, val);
2009 }
2010 EXPORT_SYMBOL_GPL(kvm_apic_write_nodecode);
2011
2012 void kvm_free_lapic(struct kvm_vcpu *vcpu)
2013 {
2014         struct kvm_lapic *apic = vcpu->arch.apic;
2015
2016         if (!vcpu->arch.apic)
2017                 return;
2018
2019         hrtimer_cancel(&apic->lapic_timer.timer);
2020
2021         if (!(vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE))
2022                 static_key_slow_dec_deferred(&apic_hw_disabled);
2023
2024         if (!apic->sw_enabled)
2025                 static_key_slow_dec_deferred(&apic_sw_disabled);
2026
2027         if (apic->regs)
2028                 free_page((unsigned long)apic->regs);
2029
2030         kfree(apic);
2031 }
2032
2033 /*
2034  *----------------------------------------------------------------------
2035  * LAPIC interface
2036  *----------------------------------------------------------------------
2037  */
2038 u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu)
2039 {
2040         struct kvm_lapic *apic = vcpu->arch.apic;
2041
2042         if (!lapic_in_kernel(vcpu) ||
2043                 !apic_lvtt_tscdeadline(apic))
2044                 return 0;
2045
2046         return apic->lapic_timer.tscdeadline;
2047 }
2048
2049 void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu, u64 data)
2050 {
2051         struct kvm_lapic *apic = vcpu->arch.apic;
2052
2053         if (!lapic_in_kernel(vcpu) || apic_lvtt_oneshot(apic) ||
2054                         apic_lvtt_period(apic))
2055                 return;
2056
2057         hrtimer_cancel(&apic->lapic_timer.timer);
2058         apic->lapic_timer.tscdeadline = data;
2059         start_apic_timer(apic);
2060 }
2061
2062 void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8)
2063 {
2064         struct kvm_lapic *apic = vcpu->arch.apic;
2065
2066         apic_set_tpr(apic, ((cr8 & 0x0f) << 4)
2067                      | (kvm_lapic_get_reg(apic, APIC_TASKPRI) & 4));
2068 }
2069
2070 u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
2071 {
2072         u64 tpr;
2073
2074         tpr = (u64) kvm_lapic_get_reg(vcpu->arch.apic, APIC_TASKPRI);
2075
2076         return (tpr & 0xf0) >> 4;
2077 }
2078
2079 void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
2080 {
2081         u64 old_value = vcpu->arch.apic_base;
2082         struct kvm_lapic *apic = vcpu->arch.apic;
2083
2084         if (!apic)
2085                 value |= MSR_IA32_APICBASE_BSP;
2086
2087         vcpu->arch.apic_base = value;
2088
2089         if ((old_value ^ value) & MSR_IA32_APICBASE_ENABLE)
2090                 kvm_update_cpuid(vcpu);
2091
2092         if (!apic)
2093                 return;
2094
2095         /* update jump label if enable bit changes */
2096         if ((old_value ^ value) & MSR_IA32_APICBASE_ENABLE) {
2097                 if (value & MSR_IA32_APICBASE_ENABLE) {
2098                         kvm_apic_set_xapic_id(apic, vcpu->vcpu_id);
2099                         static_key_slow_dec_deferred(&apic_hw_disabled);
2100                 } else {
2101                         static_key_slow_inc(&apic_hw_disabled.key);
2102                         recalculate_apic_map(vcpu->kvm);
2103                 }
2104         }
2105
2106         if (((old_value ^ value) & X2APIC_ENABLE) && (value & X2APIC_ENABLE))
2107                 kvm_apic_set_x2apic_id(apic, vcpu->vcpu_id);
2108
2109         if ((old_value ^ value) & (MSR_IA32_APICBASE_ENABLE | X2APIC_ENABLE))
2110                 kvm_x86_ops->set_virtual_apic_mode(vcpu);
2111
2112         apic->base_address = apic->vcpu->arch.apic_base &
2113                              MSR_IA32_APICBASE_BASE;
2114
2115         if ((value & MSR_IA32_APICBASE_ENABLE) &&
2116              apic->base_address != APIC_DEFAULT_PHYS_BASE)
2117                 pr_warn_once("APIC base relocation is unsupported by KVM");
2118
2119         /* with FSB delivery interrupt, we can restart APIC functionality */
2120         apic_debug("apic base msr is 0x%016" PRIx64 ", and base address is "
2121                    "0x%lx.\n", apic->vcpu->arch.apic_base, apic->base_address);
2122
2123 }
2124
2125 void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event)
2126 {
2127         struct kvm_lapic *apic = vcpu->arch.apic;
2128         int i;
2129
2130         if (!apic)
2131                 return;
2132
2133         apic_debug("%s\n", __func__);
2134
2135         /* Stop the timer in case it's a reset to an active apic */
2136         hrtimer_cancel(&apic->lapic_timer.timer);
2137
2138         if (!init_event) {
2139                 kvm_lapic_set_base(vcpu, APIC_DEFAULT_PHYS_BASE |
2140                                          MSR_IA32_APICBASE_ENABLE);
2141                 kvm_apic_set_xapic_id(apic, vcpu->vcpu_id);
2142         }
2143         kvm_apic_set_version(apic->vcpu);
2144
2145         for (i = 0; i < KVM_APIC_LVT_NUM; i++)
2146                 kvm_lapic_set_reg(apic, APIC_LVTT + 0x10 * i, APIC_LVT_MASKED);
2147         apic_update_lvtt(apic);
2148         if (kvm_vcpu_is_reset_bsp(vcpu) &&
2149             kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_LINT0_REENABLED))
2150                 kvm_lapic_set_reg(apic, APIC_LVT0,
2151                              SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT));
2152         apic_manage_nmi_watchdog(apic, kvm_lapic_get_reg(apic, APIC_LVT0));
2153
2154         kvm_lapic_set_reg(apic, APIC_DFR, 0xffffffffU);
2155         apic_set_spiv(apic, 0xff);
2156         kvm_lapic_set_reg(apic, APIC_TASKPRI, 0);
2157         if (!apic_x2apic_mode(apic))
2158                 kvm_apic_set_ldr(apic, 0);
2159         kvm_lapic_set_reg(apic, APIC_ESR, 0);
2160         kvm_lapic_set_reg(apic, APIC_ICR, 0);
2161         kvm_lapic_set_reg(apic, APIC_ICR2, 0);
2162         kvm_lapic_set_reg(apic, APIC_TDCR, 0);
2163         kvm_lapic_set_reg(apic, APIC_TMICT, 0);
2164         for (i = 0; i < 8; i++) {
2165                 kvm_lapic_set_reg(apic, APIC_IRR + 0x10 * i, 0);
2166                 kvm_lapic_set_reg(apic, APIC_ISR + 0x10 * i, 0);
2167                 kvm_lapic_set_reg(apic, APIC_TMR + 0x10 * i, 0);
2168         }
2169         apic->irr_pending = vcpu->arch.apicv_active;
2170         apic->isr_count = vcpu->arch.apicv_active ? 1 : 0;
2171         apic->highest_isr_cache = -1;
2172         update_divide_count(apic);
2173         atomic_set(&apic->lapic_timer.pending, 0);
2174         if (kvm_vcpu_is_bsp(vcpu))
2175                 kvm_lapic_set_base(vcpu,
2176                                 vcpu->arch.apic_base | MSR_IA32_APICBASE_BSP);
2177         vcpu->arch.pv_eoi.msr_val = 0;
2178         apic_update_ppr(apic);
2179         if (vcpu->arch.apicv_active) {
2180                 kvm_x86_ops->apicv_post_state_restore(vcpu);
2181                 kvm_x86_ops->hwapic_irr_update(vcpu, -1);
2182                 kvm_x86_ops->hwapic_isr_update(vcpu, -1);
2183         }
2184
2185         vcpu->arch.apic_arb_prio = 0;
2186         vcpu->arch.apic_attention = 0;
2187
2188         apic_debug("%s: vcpu=%p, id=0x%x, base_msr="
2189                    "0x%016" PRIx64 ", base_address=0x%0lx.\n", __func__,
2190                    vcpu, kvm_lapic_get_reg(apic, APIC_ID),
2191                    vcpu->arch.apic_base, apic->base_address);
2192 }
2193
2194 /*
2195  *----------------------------------------------------------------------
2196  * timer interface
2197  *----------------------------------------------------------------------
2198  */
2199
2200 static bool lapic_is_periodic(struct kvm_lapic *apic)
2201 {
2202         return apic_lvtt_period(apic);
2203 }
2204
2205 int apic_has_pending_timer(struct kvm_vcpu *vcpu)
2206 {
2207         struct kvm_lapic *apic = vcpu->arch.apic;
2208
2209         if (apic_enabled(apic) && apic_lvt_enabled(apic, APIC_LVTT))
2210                 return atomic_read(&apic->lapic_timer.pending);
2211
2212         return 0;
2213 }
2214
2215 int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type)
2216 {
2217         u32 reg = kvm_lapic_get_reg(apic, lvt_type);
2218         int vector, mode, trig_mode;
2219
2220         if (kvm_apic_hw_enabled(apic) && !(reg & APIC_LVT_MASKED)) {
2221                 vector = reg & APIC_VECTOR_MASK;
2222                 mode = reg & APIC_MODE_MASK;
2223                 trig_mode = reg & APIC_LVT_LEVEL_TRIGGER;
2224                 return __apic_accept_irq(apic, mode, vector, 1, trig_mode,
2225                                         NULL);
2226         }
2227         return 0;
2228 }
2229
2230 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu)
2231 {
2232         struct kvm_lapic *apic = vcpu->arch.apic;
2233
2234         if (apic)
2235                 kvm_apic_local_deliver(apic, APIC_LVT0);
2236 }
2237
2238 static const struct kvm_io_device_ops apic_mmio_ops = {
2239         .read     = apic_mmio_read,
2240         .write    = apic_mmio_write,
2241 };
2242
2243 static enum hrtimer_restart apic_timer_fn(struct hrtimer *data)
2244 {
2245         struct kvm_timer *ktimer = container_of(data, struct kvm_timer, timer);
2246         struct kvm_lapic *apic = container_of(ktimer, struct kvm_lapic, lapic_timer);
2247
2248         apic_timer_expired(apic);
2249
2250         if (lapic_is_periodic(apic)) {
2251                 advance_periodic_target_expiration(apic);
2252                 hrtimer_add_expires_ns(&ktimer->timer, ktimer->period);
2253                 return HRTIMER_RESTART;
2254         } else
2255                 return HRTIMER_NORESTART;
2256 }
2257
2258 int kvm_create_lapic(struct kvm_vcpu *vcpu)
2259 {
2260         struct kvm_lapic *apic;
2261
2262         ASSERT(vcpu != NULL);
2263         apic_debug("apic_init %d\n", vcpu->vcpu_id);
2264
2265         apic = kzalloc(sizeof(*apic), GFP_KERNEL_ACCOUNT);
2266         if (!apic)
2267                 goto nomem;
2268
2269         vcpu->arch.apic = apic;
2270
2271         apic->regs = (void *)get_zeroed_page(GFP_KERNEL_ACCOUNT);
2272         if (!apic->regs) {
2273                 printk(KERN_ERR "malloc apic regs error for vcpu %x\n",
2274                        vcpu->vcpu_id);
2275                 goto nomem_free_apic;
2276         }
2277         apic->vcpu = vcpu;
2278
2279         hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC,
2280                      HRTIMER_MODE_ABS_PINNED);
2281         apic->lapic_timer.timer.function = apic_timer_fn;
2282
2283         /*
2284          * APIC is created enabled. This will prevent kvm_lapic_set_base from
2285          * thinking that APIC satet has changed.
2286          */
2287         vcpu->arch.apic_base = MSR_IA32_APICBASE_ENABLE;
2288         static_key_slow_inc(&apic_sw_disabled.key); /* sw disabled at reset */
2289         kvm_iodevice_init(&apic->dev, &apic_mmio_ops);
2290
2291         return 0;
2292 nomem_free_apic:
2293         kfree(apic);
2294 nomem:
2295         return -ENOMEM;
2296 }
2297
2298 int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
2299 {
2300         struct kvm_lapic *apic = vcpu->arch.apic;
2301         u32 ppr;
2302
2303         if (!apic_enabled(apic))
2304                 return -1;
2305
2306         __apic_update_ppr(apic, &ppr);
2307         return apic_has_interrupt_for_ppr(apic, ppr);
2308 }
2309
2310 int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
2311 {
2312         u32 lvt0 = kvm_lapic_get_reg(vcpu->arch.apic, APIC_LVT0);
2313         int r = 0;
2314
2315         if (!kvm_apic_hw_enabled(vcpu->arch.apic))
2316                 r = 1;
2317         if ((lvt0 & APIC_LVT_MASKED) == 0 &&
2318             GET_APIC_DELIVERY_MODE(lvt0) == APIC_MODE_EXTINT)
2319                 r = 1;
2320         return r;
2321 }
2322
2323 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu)
2324 {
2325         struct kvm_lapic *apic = vcpu->arch.apic;
2326
2327         if (atomic_read(&apic->lapic_timer.pending) > 0) {
2328                 kvm_apic_local_deliver(apic, APIC_LVTT);
2329                 if (apic_lvtt_tscdeadline(apic))
2330                         apic->lapic_timer.tscdeadline = 0;
2331                 if (apic_lvtt_oneshot(apic)) {
2332                         apic->lapic_timer.tscdeadline = 0;
2333                         apic->lapic_timer.target_expiration = 0;
2334                 }
2335                 atomic_set(&apic->lapic_timer.pending, 0);
2336         }
2337 }
2338
2339 int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
2340 {
2341         int vector = kvm_apic_has_interrupt(vcpu);
2342         struct kvm_lapic *apic = vcpu->arch.apic;
2343         u32 ppr;
2344
2345         if (vector == -1)
2346                 return -1;
2347
2348         /*
2349          * We get here even with APIC virtualization enabled, if doing
2350          * nested virtualization and L1 runs with the "acknowledge interrupt
2351          * on exit" mode.  Then we cannot inject the interrupt via RVI,
2352          * because the process would deliver it through the IDT.
2353          */
2354
2355         apic_clear_irr(vector, apic);
2356         if (test_bit(vector, vcpu_to_synic(vcpu)->auto_eoi_bitmap)) {
2357                 /*
2358                  * For auto-EOI interrupts, there might be another pending
2359                  * interrupt above PPR, so check whether to raise another
2360                  * KVM_REQ_EVENT.
2361                  */
2362                 apic_update_ppr(apic);
2363         } else {
2364                 /*
2365                  * For normal interrupts, PPR has been raised and there cannot
2366                  * be a higher-priority pending interrupt---except if there was
2367                  * a concurrent interrupt injection, but that would have
2368                  * triggered KVM_REQ_EVENT already.
2369                  */
2370                 apic_set_isr(vector, apic);
2371                 __apic_update_ppr(apic, &ppr);
2372         }
2373
2374         return vector;
2375 }
2376
2377 static int kvm_apic_state_fixup(struct kvm_vcpu *vcpu,
2378                 struct kvm_lapic_state *s, bool set)
2379 {
2380         if (apic_x2apic_mode(vcpu->arch.apic)) {
2381                 u32 *id = (u32 *)(s->regs + APIC_ID);
2382                 u32 *ldr = (u32 *)(s->regs + APIC_LDR);
2383
2384                 if (vcpu->kvm->arch.x2apic_format) {
2385                         if (*id != vcpu->vcpu_id)
2386                                 return -EINVAL;
2387                 } else {
2388                         if (set)
2389                                 *id >>= 24;
2390                         else
2391                                 *id <<= 24;
2392                 }
2393
2394                 /* In x2APIC mode, the LDR is fixed and based on the id */
2395                 if (set)
2396                         *ldr = kvm_apic_calc_x2apic_ldr(*id);
2397         }
2398
2399         return 0;
2400 }
2401
2402 int kvm_apic_get_state(struct kvm_vcpu *vcpu, struct kvm_lapic_state *s)
2403 {
2404         memcpy(s->regs, vcpu->arch.apic->regs, sizeof(*s));
2405         return kvm_apic_state_fixup(vcpu, s, false);
2406 }
2407
2408 int kvm_apic_set_state(struct kvm_vcpu *vcpu, struct kvm_lapic_state *s)
2409 {
2410         struct kvm_lapic *apic = vcpu->arch.apic;
2411         int r;
2412
2413
2414         kvm_lapic_set_base(vcpu, vcpu->arch.apic_base);
2415         /* set SPIV separately to get count of SW disabled APICs right */
2416         apic_set_spiv(apic, *((u32 *)(s->regs + APIC_SPIV)));
2417
2418         r = kvm_apic_state_fixup(vcpu, s, true);
2419         if (r)
2420                 return r;
2421         memcpy(vcpu->arch.apic->regs, s->regs, sizeof(*s));
2422
2423         recalculate_apic_map(vcpu->kvm);
2424         kvm_apic_set_version(vcpu);
2425
2426         apic_update_ppr(apic);
2427         hrtimer_cancel(&apic->lapic_timer.timer);
2428         apic_update_lvtt(apic);
2429         apic_manage_nmi_watchdog(apic, kvm_lapic_get_reg(apic, APIC_LVT0));
2430         update_divide_count(apic);
2431         start_apic_timer(apic);
2432         apic->irr_pending = true;
2433         apic->isr_count = vcpu->arch.apicv_active ?
2434                                 1 : count_vectors(apic->regs + APIC_ISR);
2435         apic->highest_isr_cache = -1;
2436         if (vcpu->arch.apicv_active) {
2437                 kvm_x86_ops->apicv_post_state_restore(vcpu);
2438                 kvm_x86_ops->hwapic_irr_update(vcpu,
2439                                 apic_find_highest_irr(apic));
2440                 kvm_x86_ops->hwapic_isr_update(vcpu,
2441                                 apic_find_highest_isr(apic));
2442         }
2443         kvm_make_request(KVM_REQ_EVENT, vcpu);
2444         if (ioapic_in_kernel(vcpu->kvm))
2445                 kvm_rtc_eoi_tracking_restore_one(vcpu);
2446
2447         vcpu->arch.apic_arb_prio = 0;
2448
2449         return 0;
2450 }
2451
2452 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
2453 {
2454         struct hrtimer *timer;
2455
2456         if (!lapic_in_kernel(vcpu))
2457                 return;
2458
2459         timer = &vcpu->arch.apic->lapic_timer.timer;
2460         if (hrtimer_cancel(timer))
2461                 hrtimer_start_expires(timer, HRTIMER_MODE_ABS_PINNED);
2462 }
2463
2464 /*
2465  * apic_sync_pv_eoi_from_guest - called on vmexit or cancel interrupt
2466  *
2467  * Detect whether guest triggered PV EOI since the
2468  * last entry. If yes, set EOI on guests's behalf.
2469  * Clear PV EOI in guest memory in any case.
2470  */
2471 static void apic_sync_pv_eoi_from_guest(struct kvm_vcpu *vcpu,
2472                                         struct kvm_lapic *apic)
2473 {
2474         bool pending;
2475         int vector;
2476         /*
2477          * PV EOI state is derived from KVM_APIC_PV_EOI_PENDING in host
2478          * and KVM_PV_EOI_ENABLED in guest memory as follows:
2479          *
2480          * KVM_APIC_PV_EOI_PENDING is unset:
2481          *      -> host disabled PV EOI.
2482          * KVM_APIC_PV_EOI_PENDING is set, KVM_PV_EOI_ENABLED is set:
2483          *      -> host enabled PV EOI, guest did not execute EOI yet.
2484          * KVM_APIC_PV_EOI_PENDING is set, KVM_PV_EOI_ENABLED is unset:
2485          *      -> host enabled PV EOI, guest executed EOI.
2486          */
2487         BUG_ON(!pv_eoi_enabled(vcpu));
2488         pending = pv_eoi_get_pending(vcpu);
2489         /*
2490          * Clear pending bit in any case: it will be set again on vmentry.
2491          * While this might not be ideal from performance point of view,
2492          * this makes sure pv eoi is only enabled when we know it's safe.
2493          */
2494         pv_eoi_clr_pending(vcpu);
2495         if (pending)
2496                 return;
2497         vector = apic_set_eoi(apic);
2498         trace_kvm_pv_eoi(apic, vector);
2499 }
2500
2501 void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu)
2502 {
2503         u32 data;
2504
2505         if (test_bit(KVM_APIC_PV_EOI_PENDING, &vcpu->arch.apic_attention))
2506                 apic_sync_pv_eoi_from_guest(vcpu, vcpu->arch.apic);
2507
2508         if (!test_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention))
2509                 return;
2510
2511         if (kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.apic->vapic_cache, &data,
2512                                   sizeof(u32)))
2513                 return;
2514
2515         apic_set_tpr(vcpu->arch.apic, data & 0xff);
2516 }
2517
2518 /*
2519  * apic_sync_pv_eoi_to_guest - called before vmentry
2520  *
2521  * Detect whether it's safe to enable PV EOI and
2522  * if yes do so.
2523  */
2524 static void apic_sync_pv_eoi_to_guest(struct kvm_vcpu *vcpu,
2525                                         struct kvm_lapic *apic)
2526 {
2527         if (!pv_eoi_enabled(vcpu) ||
2528             /* IRR set or many bits in ISR: could be nested. */
2529             apic->irr_pending ||
2530             /* Cache not set: could be safe but we don't bother. */
2531             apic->highest_isr_cache == -1 ||
2532             /* Need EOI to update ioapic. */
2533             kvm_ioapic_handles_vector(apic, apic->highest_isr_cache)) {
2534                 /*
2535                  * PV EOI was disabled by apic_sync_pv_eoi_from_guest
2536                  * so we need not do anything here.
2537                  */
2538                 return;
2539         }
2540
2541         pv_eoi_set_pending(apic->vcpu);
2542 }
2543
2544 void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu)
2545 {
2546         u32 data, tpr;
2547         int max_irr, max_isr;
2548         struct kvm_lapic *apic = vcpu->arch.apic;
2549
2550         apic_sync_pv_eoi_to_guest(vcpu, apic);
2551
2552         if (!test_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention))
2553                 return;
2554
2555         tpr = kvm_lapic_get_reg(apic, APIC_TASKPRI) & 0xff;
2556         max_irr = apic_find_highest_irr(apic);
2557         if (max_irr < 0)
2558                 max_irr = 0;
2559         max_isr = apic_find_highest_isr(apic);
2560         if (max_isr < 0)
2561                 max_isr = 0;
2562         data = (tpr & 0xff) | ((max_isr & 0xf0) << 8) | (max_irr << 24);
2563
2564         kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apic->vapic_cache, &data,
2565                                 sizeof(u32));
2566 }
2567
2568 int kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr)
2569 {
2570         if (vapic_addr) {
2571                 if (kvm_gfn_to_hva_cache_init(vcpu->kvm,
2572                                         &vcpu->arch.apic->vapic_cache,
2573                                         vapic_addr, sizeof(u32)))
2574                         return -EINVAL;
2575                 __set_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention);
2576         } else {
2577                 __clear_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention);
2578         }
2579
2580         vcpu->arch.apic->vapic_addr = vapic_addr;
2581         return 0;
2582 }
2583
2584 int kvm_x2apic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data)
2585 {
2586         struct kvm_lapic *apic = vcpu->arch.apic;
2587         u32 reg = (msr - APIC_BASE_MSR) << 4;
2588
2589         if (!lapic_in_kernel(vcpu) || !apic_x2apic_mode(apic))
2590                 return 1;
2591
2592         if (reg == APIC_ICR2)
2593                 return 1;
2594
2595         /* if this is ICR write vector before command */
2596         if (reg == APIC_ICR)
2597                 kvm_lapic_reg_write(apic, APIC_ICR2, (u32)(data >> 32));
2598         return kvm_lapic_reg_write(apic, reg, (u32)data);
2599 }
2600
2601 int kvm_x2apic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
2602 {
2603         struct kvm_lapic *apic = vcpu->arch.apic;
2604         u32 reg = (msr - APIC_BASE_MSR) << 4, low, high = 0;
2605
2606         if (!lapic_in_kernel(vcpu) || !apic_x2apic_mode(apic))
2607                 return 1;
2608
2609         if (reg == APIC_DFR || reg == APIC_ICR2) {
2610                 apic_debug("KVM_APIC_READ: read x2apic reserved register %x\n",
2611                            reg);
2612                 return 1;
2613         }
2614
2615         if (kvm_lapic_reg_read(apic, reg, 4, &low))
2616                 return 1;
2617         if (reg == APIC_ICR)
2618                 kvm_lapic_reg_read(apic, APIC_ICR2, 4, &high);
2619
2620         *data = (((u64)high) << 32) | low;
2621
2622         return 0;
2623 }
2624
2625 int kvm_hv_vapic_msr_write(struct kvm_vcpu *vcpu, u32 reg, u64 data)
2626 {
2627         struct kvm_lapic *apic = vcpu->arch.apic;
2628
2629         if (!lapic_in_kernel(vcpu))
2630                 return 1;
2631
2632         /* if this is ICR write vector before command */
2633         if (reg == APIC_ICR)
2634                 kvm_lapic_reg_write(apic, APIC_ICR2, (u32)(data >> 32));
2635         return kvm_lapic_reg_write(apic, reg, (u32)data);
2636 }
2637
2638 int kvm_hv_vapic_msr_read(struct kvm_vcpu *vcpu, u32 reg, u64 *data)
2639 {
2640         struct kvm_lapic *apic = vcpu->arch.apic;
2641         u32 low, high = 0;
2642
2643         if (!lapic_in_kernel(vcpu))
2644                 return 1;
2645
2646         if (kvm_lapic_reg_read(apic, reg, 4, &low))
2647                 return 1;
2648         if (reg == APIC_ICR)
2649                 kvm_lapic_reg_read(apic, APIC_ICR2, 4, &high);
2650
2651         *data = (((u64)high) << 32) | low;
2652
2653         return 0;
2654 }
2655
2656 int kvm_lapic_enable_pv_eoi(struct kvm_vcpu *vcpu, u64 data, unsigned long len)
2657 {
2658         u64 addr = data & ~KVM_MSR_ENABLED;
2659         struct gfn_to_hva_cache *ghc = &vcpu->arch.pv_eoi.data;
2660         unsigned long new_len;
2661
2662         if (!IS_ALIGNED(addr, 4))
2663                 return 1;
2664
2665         vcpu->arch.pv_eoi.msr_val = data;
2666         if (!pv_eoi_enabled(vcpu))
2667                 return 0;
2668
2669         if (addr == ghc->gpa && len <= ghc->len)
2670                 new_len = ghc->len;
2671         else
2672                 new_len = len;
2673
2674         return kvm_gfn_to_hva_cache_init(vcpu->kvm, ghc, addr, new_len);
2675 }
2676
2677 void kvm_apic_accept_events(struct kvm_vcpu *vcpu)
2678 {
2679         struct kvm_lapic *apic = vcpu->arch.apic;
2680         u8 sipi_vector;
2681         unsigned long pe;
2682
2683         if (!lapic_in_kernel(vcpu) || !apic->pending_events)
2684                 return;
2685
2686         /*
2687          * INITs are latched while in SMM.  Because an SMM CPU cannot
2688          * be in KVM_MP_STATE_INIT_RECEIVED state, just eat SIPIs
2689          * and delay processing of INIT until the next RSM.
2690          */
2691         if (is_smm(vcpu)) {
2692                 WARN_ON_ONCE(vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED);
2693                 if (test_bit(KVM_APIC_SIPI, &apic->pending_events))
2694                         clear_bit(KVM_APIC_SIPI, &apic->pending_events);
2695                 return;
2696         }
2697
2698         pe = xchg(&apic->pending_events, 0);
2699         if (test_bit(KVM_APIC_INIT, &pe)) {
2700                 kvm_vcpu_reset(vcpu, true);
2701                 if (kvm_vcpu_is_bsp(apic->vcpu))
2702                         vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
2703                 else
2704                         vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
2705         }
2706         if (test_bit(KVM_APIC_SIPI, &pe) &&
2707             vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
2708                 /* evaluate pending_events before reading the vector */
2709                 smp_rmb();
2710                 sipi_vector = apic->sipi_vector;
2711                 apic_debug("vcpu %d received sipi with vector # %x\n",
2712                          vcpu->vcpu_id, sipi_vector);
2713                 kvm_vcpu_deliver_sipi_vector(vcpu, sipi_vector);
2714                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
2715         }
2716 }
2717
2718 void kvm_lapic_init(void)
2719 {
2720         /* do not patch jump label more than once per second */
2721         jump_label_rate_limit(&apic_hw_disabled, HZ);
2722         jump_label_rate_limit(&apic_sw_disabled, HZ);
2723 }
2724
2725 void kvm_lapic_exit(void)
2726 {
2727         static_key_deferred_flush(&apic_hw_disabled);
2728         static_key_deferred_flush(&apic_sw_disabled);
2729 }