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 <[email protected]>
  12  *   Gregory Haskins <[email protected]>
  13  *   Yaozu (Eddie) Dong <[email protected]>
  14  *
  15  * Based on Xen 3.1 code, Copyright (c) 2004, Intel Corporation.
  16  *
  17  * This work is licensed under the terms of the GNU GPL, version 2.  See
  18  * the COPYING file in the top-level directory.
  19  */
  20
  21 #include <linux/kvm_host.h>
  22 #include <linux/kvm.h>
  23 #include <linux/mm.h>
  24 #include <linux/highmem.h>
  25 #include <linux/smp.h>
  26 #include <linux/hrtimer.h>
  27 #include <linux/io.h>
  28 #include <linux/module.h>
  29 #include <linux/math64.h>
  30 #include <linux/slab.h>
  31 #include <asm/processor.h>
  32 #include <asm/msr.h>
  33 #include <asm/page.h>
  34 #include <asm/current.h>
  35 #include <asm/apicdef.h>
  36 #include <linux/atomic.h>
  37 #include "kvm_cache_regs.h"
  38 #include "irq.h"
  39 #include "trace.h"
  40 #include "x86.h"
  41 #include "cpuid.h"
  42
  43 #ifndef CONFIG_X86_64
  44 #define mod_64(x, y) ((x) - (y) * div64_u64(x, y))
  45 #else
  46 #define mod_64(x, y) ((x) % (y))
  47 #endif
  48
  49 #define PRId64 "d"
  50 #define PRIx64 "llx"
  51 #define PRIu64 "u"
  52 #define PRIo64 "o"
  53
  54 #define APIC_BUS_CYCLE_NS 1
  55
  56 /* #define apic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) */
  57 #define apic_debug(fmt, arg...)
  58
  59 #define APIC_LVT_NUM                    6
  60 /* 14 is the version for Xeon and Pentium 8.4.8*/
  61 #define APIC_VERSION                    (0x14UL | ((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
  69 #define VEC_POS(v) ((v) & (32 - 1))
  70 #define REG_POS(v) (((v) >> 5) << 4)
  71
  72 static unsigned int min_timer_period_us = 500;
  73 module_param(min_timer_period_us, uint, S_IRUGO | S_IWUSR);
  74
  75 static inline u32 apic_get_reg(struct kvm_lapic *apic, int reg_off)
  76 {
  77         return *((u32 *) (apic->regs + reg_off));
  78 }
  79
  80 static inline void apic_set_reg(struct kvm_lapic *apic, int reg_off, u32 val)
  81 {
  82         *((u32 *) (apic->regs + reg_off)) = val;
  83 }
  84
  85 static inline int apic_test_and_set_vector(int vec, void *bitmap)
  86 {
  87         return test_and_set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  88 }
  89
  90 static inline int apic_test_and_clear_vector(int vec, void *bitmap)
  91 {
  92         return test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  93 }
  94
  95 static inline void apic_set_vector(int vec, void *bitmap)
  96 {
  97         set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  98 }
  99
 100 static inline void apic_clear_vector(int vec, void *bitmap)
 101 {
 102         clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
 103 }
 104
 105 static inline int apic_hw_enabled(struct kvm_lapic *apic)
 106 {
 107         return (apic)->vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE;
 108 }
 109
 110 static inline int  apic_sw_enabled(struct kvm_lapic *apic)
 111 {
 112         return apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_APIC_ENABLED;
 113 }
 114
 115 static inline int apic_enabled(struct kvm_lapic *apic)
 116 {
 117         return apic_sw_enabled(apic) && apic_hw_enabled(apic);
 118 }
 119
 120 #define LVT_MASK        \
 121         (APIC_LVT_MASKED | APIC_SEND_PENDING | APIC_VECTOR_MASK)
 122
 123 #define LINT_MASK       \
 124         (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
 125          APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
 126
 127 static inline int kvm_apic_id(struct kvm_lapic *apic)
 128 {
 129         return (apic_get_reg(apic, APIC_ID) >> 24) & 0xff;
 130 }
 131
 132 static inline int apic_lvt_enabled(struct kvm_lapic *apic, int lvt_type)
 133 {
 134         return !(apic_get_reg(apic, lvt_type) & APIC_LVT_MASKED);
 135 }
 136
 137 static inline int apic_lvt_vector(struct kvm_lapic *apic, int lvt_type)
 138 {
 139         return apic_get_reg(apic, lvt_type) & APIC_VECTOR_MASK;
 140 }
 141
 142 static inline int apic_lvtt_oneshot(struct kvm_lapic *apic)
 143 {
 144         return ((apic_get_reg(apic, APIC_LVTT) &
 145                 apic->lapic_timer.timer_mode_mask) == APIC_LVT_TIMER_ONESHOT);
 146 }
 147
 148 static inline int apic_lvtt_period(struct kvm_lapic *apic)
 149 {
 150         return ((apic_get_reg(apic, APIC_LVTT) &
 151                 apic->lapic_timer.timer_mode_mask) == APIC_LVT_TIMER_PERIODIC);
 152 }
 153
 154 static inline int apic_lvtt_tscdeadline(struct kvm_lapic *apic)
 155 {
 156         return ((apic_get_reg(apic, APIC_LVTT) &
 157                 apic->lapic_timer.timer_mode_mask) ==
 158                         APIC_LVT_TIMER_TSCDEADLINE);
 159 }
 160
 161 static inline int apic_lvt_nmi_mode(u32 lvt_val)
 162 {
 163         return (lvt_val & (APIC_MODE_MASK | APIC_LVT_MASKED)) == APIC_DM_NMI;
 164 }
 165
 166 void kvm_apic_set_version(struct kvm_vcpu *vcpu)
 167 {
 168         struct kvm_lapic *apic = vcpu->arch.apic;
 169         struct kvm_cpuid_entry2 *feat;
 170         u32 v = APIC_VERSION;
 171
 172         if (!irqchip_in_kernel(vcpu->kvm))
 173                 return;
 174
 175         feat = kvm_find_cpuid_entry(apic->vcpu, 0x1, 0);
 176         if (feat && (feat->ecx & (1 << (X86_FEATURE_X2APIC & 31))))
 177                 v |= APIC_LVR_DIRECTED_EOI;
 178         apic_set_reg(apic, APIC_LVR, v);
 179 }
 180
 181 static inline int apic_x2apic_mode(struct kvm_lapic *apic)
 182 {
 183         return apic->vcpu->arch.apic_base & X2APIC_ENABLE;
 184 }
 185
 186 static unsigned int apic_lvt_mask[APIC_LVT_NUM] = {
 187         LVT_MASK ,      /* part LVTT mask, timer mode mask added at runtime */
 188         LVT_MASK | APIC_MODE_MASK,      /* LVTTHMR */
 189         LVT_MASK | APIC_MODE_MASK,      /* LVTPC */
 190         LINT_MASK, LINT_MASK,   /* LVT0-1 */
 191         LVT_MASK                /* LVTERR */
 192 };
 193
 194 static int find_highest_vector(void *bitmap)
 195 {
 196         u32 *word = bitmap;
 197         int word_offset = MAX_APIC_VECTOR >> 5;
 198
 199         while ((word_offset != 0) && (word[(--word_offset) << 2] == 0))
 200                 continue;
 201
 202         if (likely(!word_offset && !word[0]))
 203                 return -1;
 204         else
 205                 return fls(word[word_offset << 2]) - 1 + (word_offset << 5);
 206 }
 207
 208 static inline int apic_test_and_set_irr(int vec, struct kvm_lapic *apic)
 209 {
 210         apic->irr_pending = true;
 211         return apic_test_and_set_vector(vec, apic->regs + APIC_IRR);
 212 }
 213
 214 static inline int apic_search_irr(struct kvm_lapic *apic)
 215 {
 216         return find_highest_vector(apic->regs + APIC_IRR);
 217 }
 218
 219 static inline int apic_find_highest_irr(struct kvm_lapic *apic)
 220 {
 221         int result;
 222
 223         if (!apic->irr_pending)
 224                 return -1;
 225
 226         result = apic_search_irr(apic);
 227         ASSERT(result == -1 || result >= 16);
 228
 229         return result;
 230 }
 231
 232 static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
 233 {
 234         apic->irr_pending = false;
 235         apic_clear_vector(vec, apic->regs + APIC_IRR);
 236         if (apic_search_irr(apic) != -1)
 237                 apic->irr_pending = true;
 238 }
 239
 240 int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
 241 {
 242         struct kvm_lapic *apic = vcpu->arch.apic;
 243         int highest_irr;
 244
 245         /* This may race with setting of irr in __apic_accept_irq() and
 246          * value returned may be wrong, but kvm_vcpu_kick() in __apic_accept_irq
 247          * will cause vmexit immediately and the value will be recalculated
 248          * on the next vmentry.
 249          */
 250         if (!apic)
 251                 return 0;
 252         highest_irr = apic_find_highest_irr(apic);
 253
 254         return highest_irr;
 255 }
 256
 257 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
 258                              int vector, int level, int trig_mode);
 259
 260 int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq)
 261 {
 262         struct kvm_lapic *apic = vcpu->arch.apic;
 263
 264         return __apic_accept_irq(apic, irq->delivery_mode, irq->vector,
 265                         irq->level, irq->trig_mode);
 266 }
 267
 268 static inline int apic_find_highest_isr(struct kvm_lapic *apic)
 269 {
 270         int result;
 271
 272         result = find_highest_vector(apic->regs + APIC_ISR);
 273         ASSERT(result == -1 || result >= 16);
 274
 275         return result;
 276 }
 277
 278 static void apic_update_ppr(struct kvm_lapic *apic)
 279 {
 280         u32 tpr, isrv, ppr, old_ppr;
 281         int isr;
 282
 283         old_ppr = apic_get_reg(apic, APIC_PROCPRI);
 284         tpr = apic_get_reg(apic, APIC_TASKPRI);
 285         isr = apic_find_highest_isr(apic);
 286         isrv = (isr != -1) ? isr : 0;
 287
 288         if ((tpr & 0xf0) >= (isrv & 0xf0))
 289                 ppr = tpr & 0xff;
 290         else
 291                 ppr = isrv & 0xf0;
 292
 293         apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x",
 294                    apic, ppr, isr, isrv);
 295
 296         if (old_ppr != ppr) {
 297                 apic_set_reg(apic, APIC_PROCPRI, ppr);
 298                 if (ppr < old_ppr)
 299                         kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
 300         }
 301 }
 302
 303 static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
 304 {
 305         apic_set_reg(apic, APIC_TASKPRI, tpr);
 306         apic_update_ppr(apic);
 307 }
 308
 309 int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest)
 310 {
 311         return dest == 0xff || kvm_apic_id(apic) == dest;
 312 }
 313
 314 int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda)
 315 {
 316         int result = 0;
 317         u32 logical_id;
 318
 319         if (apic_x2apic_mode(apic)) {
 320                 logical_id = apic_get_reg(apic, APIC_LDR);
 321                 return logical_id & mda;
 322         }
 323
 324         logical_id = GET_APIC_LOGICAL_ID(apic_get_reg(apic, APIC_LDR));
 325
 326         switch (apic_get_reg(apic, APIC_DFR)) {
 327         case APIC_DFR_FLAT:
 328                 if (logical_id & mda)
 329                         result = 1;
 330                 break;
 331         case APIC_DFR_CLUSTER:
 332                 if (((logical_id >> 4) == (mda >> 0x4))
 333                     && (logical_id & mda & 0xf))
 334                         result = 1;
 335                 break;
 336         default:
 337                 apic_debug("Bad DFR vcpu %d: %08x\n",
 338                            apic->vcpu->vcpu_id, apic_get_reg(apic, APIC_DFR));
 339                 break;
 340         }
 341
 342         return result;
 343 }
 344
 345 int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
 346                            int short_hand, int dest, int dest_mode)
 347 {
 348         int result = 0;
 349         struct kvm_lapic *target = vcpu->arch.apic;
 350
 351         apic_debug("target %p, source %p, dest 0x%x, "
 352                    "dest_mode 0x%x, short_hand 0x%x\n",
 353                    target, source, dest, dest_mode, short_hand);
 354
 355         ASSERT(target);
 356         switch (short_hand) {
 357         case APIC_DEST_NOSHORT:
 358                 if (dest_mode == 0)
 359                         /* Physical mode. */
 360                         result = kvm_apic_match_physical_addr(target, dest);
 361                 else
 362                         /* Logical mode. */
 363                         result = kvm_apic_match_logical_addr(target, dest);
 364                 break;
 365         case APIC_DEST_SELF:
 366                 result = (target == source);
 367                 break;
 368         case APIC_DEST_ALLINC:
 369                 result = 1;
 370                 break;
 371         case APIC_DEST_ALLBUT:
 372                 result = (target != source);
 373                 break;
 374         default:
 375                 apic_debug("kvm: apic: Bad dest shorthand value %x\n",
 376                            short_hand);
 377                 break;
 378         }
 379
 380         return result;
 381 }
 382
 383 /*
 384  * Add a pending IRQ into lapic.
 385  * Return 1 if successfully added and 0 if discarded.
 386  */
 387 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
 388                              int vector, int level, int trig_mode)
 389 {
 390         int result = 0;
 391         struct kvm_vcpu *vcpu = apic->vcpu;
 392
 393         switch (delivery_mode) {
 394         case APIC_DM_LOWEST:
 395                 vcpu->arch.apic_arb_prio++;
 396         case APIC_DM_FIXED:
 397                 /* FIXME add logic for vcpu on reset */
 398                 if (unlikely(!apic_enabled(apic)))
 399                         break;
 400
 401                 if (trig_mode) {
 402                         apic_debug("level trig mode for vector %d", vector);
 403                         apic_set_vector(vector, apic->regs + APIC_TMR);
 404                 } else
 405                         apic_clear_vector(vector, apic->regs + APIC_TMR);
 406
 407                 result = !apic_test_and_set_irr(vector, apic);
 408                 trace_kvm_apic_accept_irq(vcpu->vcpu_id, delivery_mode,
 409                                           trig_mode, vector, !result);
 410                 if (!result) {
 411                         if (trig_mode)
 412                                 apic_debug("level trig mode repeatedly for "
 413                                                 "vector %d", vector);
 414                         break;
 415                 }
 416
 417                 kvm_make_request(KVM_REQ_EVENT, vcpu);
 418                 kvm_vcpu_kick(vcpu);
 419                 break;
 420
 421         case APIC_DM_REMRD:
 422                 apic_debug("Ignoring delivery mode 3\n");
 423                 break;
 424
 425         case APIC_DM_SMI:
 426                 apic_debug("Ignoring guest SMI\n");
 427                 break;
 428
 429         case APIC_DM_NMI:
 430                 result = 1;
 431                 kvm_inject_nmi(vcpu);
 432                 kvm_vcpu_kick(vcpu);
 433                 break;
 434
 435         case APIC_DM_INIT:
 436                 if (!trig_mode || level) {
 437                         result = 1;
 438                         vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
 439                         kvm_make_request(KVM_REQ_EVENT, vcpu);
 440                         kvm_vcpu_kick(vcpu);
 441                 } else {
 442                         apic_debug("Ignoring de-assert INIT to vcpu %d\n",
 443                                    vcpu->vcpu_id);
 444                 }
 445                 break;
 446
 447         case APIC_DM_STARTUP:
 448                 apic_debug("SIPI to vcpu %d vector 0x%02x\n",
 449                            vcpu->vcpu_id, vector);
 450                 if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
 451                         result = 1;
 452                         vcpu->arch.sipi_vector = vector;
 453                         vcpu->arch.mp_state = KVM_MP_STATE_SIPI_RECEIVED;
 454                         kvm_make_request(KVM_REQ_EVENT, vcpu);
 455                         kvm_vcpu_kick(vcpu);
 456                 }
 457                 break;
 458
 459         case APIC_DM_EXTINT:
 460                 /*
 461                  * Should only be called by kvm_apic_local_deliver() with LVT0,
 462                  * before NMI watchdog was enabled. Already handled by
 463                  * kvm_apic_accept_pic_intr().
 464                  */
 465                 break;
 466
 467         default:
 468                 printk(KERN_ERR "TODO: unsupported delivery mode %x\n",
 469                        delivery_mode);
 470                 break;
 471         }
 472         return result;
 473 }
 474
 475 int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2)
 476 {
 477         return vcpu1->arch.apic_arb_prio - vcpu2->arch.apic_arb_prio;
 478 }
 479
 480 static void apic_set_eoi(struct kvm_lapic *apic)
 481 {
 482         int vector = apic_find_highest_isr(apic);
 483         int trigger_mode;
 484         /*
 485          * Not every write EOI will has corresponding ISR,
 486          * one example is when Kernel check timer on setup_IO_APIC
 487          */
 488         if (vector == -1)
 489                 return;
 490
 491         apic_clear_vector(vector, apic->regs + APIC_ISR);
 492         apic_update_ppr(apic);
 493
 494         if (apic_test_and_clear_vector(vector, apic->regs + APIC_TMR))
 495                 trigger_mode = IOAPIC_LEVEL_TRIG;
 496         else
 497                 trigger_mode = IOAPIC_EDGE_TRIG;
 498         if (!(apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_DIRECTED_EOI))
 499                 kvm_ioapic_update_eoi(apic->vcpu->kvm, vector, trigger_mode);
 500         kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
 501 }
 502
 503 static void apic_send_ipi(struct kvm_lapic *apic)
 504 {
 505         u32 icr_low = apic_get_reg(apic, APIC_ICR);
 506         u32 icr_high = apic_get_reg(apic, APIC_ICR2);
 507         struct kvm_lapic_irq irq;
 508
 509         irq.vector = icr_low & APIC_VECTOR_MASK;
 510         irq.delivery_mode = icr_low & APIC_MODE_MASK;
 511         irq.dest_mode = icr_low & APIC_DEST_MASK;
 512         irq.level = icr_low & APIC_INT_ASSERT;
 513         irq.trig_mode = icr_low & APIC_INT_LEVELTRIG;
 514         irq.shorthand = icr_low & APIC_SHORT_MASK;
 515         if (apic_x2apic_mode(apic))
 516                 irq.dest_id = icr_high;
 517         else
 518                 irq.dest_id = GET_APIC_DEST_FIELD(icr_high);
 519
 520         trace_kvm_apic_ipi(icr_low, irq.dest_id);
 521
 522         apic_debug("icr_high 0x%x, icr_low 0x%x, "
 523                    "short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
 524                    "dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x\n",
 525                    icr_high, icr_low, irq.shorthand, irq.dest_id,
 526                    irq.trig_mode, irq.level, irq.dest_mode, irq.delivery_mode,
 527                    irq.vector);
 528
 529         kvm_irq_delivery_to_apic(apic->vcpu->kvm, apic, &irq);
 530 }
 531
 532 static u32 apic_get_tmcct(struct kvm_lapic *apic)
 533 {
 534         ktime_t remaining;
 535         s64 ns;
 536         u32 tmcct;
 537
 538         ASSERT(apic != NULL);
 539
 540         /* if initial count is 0, current count should also be 0 */
 541         if (apic_get_reg(apic, APIC_TMICT) == 0)
 542                 return 0;
 543
 544         remaining = hrtimer_get_remaining(&apic->lapic_timer.timer);
 545         if (ktime_to_ns(remaining) < 0)
 546                 remaining = ktime_set(0, 0);
 547
 548         ns = mod_64(ktime_to_ns(remaining), apic->lapic_timer.period);
 549         tmcct = div64_u64(ns,
 550                          (APIC_BUS_CYCLE_NS * apic->divide_count));
 551
 552         return tmcct;
 553 }
 554
 555 static void __report_tpr_access(struct kvm_lapic *apic, bool write)
 556 {
 557         struct kvm_vcpu *vcpu = apic->vcpu;
 558         struct kvm_run *run = vcpu->run;
 559
 560         kvm_make_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu);
 561         run->tpr_access.rip = kvm_rip_read(vcpu);
 562         run->tpr_access.is_write = write;
 563 }
 564
 565 static inline void report_tpr_access(struct kvm_lapic *apic, bool write)
 566 {
 567         if (apic->vcpu->arch.tpr_access_reporting)
 568                 __report_tpr_access(apic, write);
 569 }
 570
 571 static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset)
 572 {
 573         u32 val = 0;
 574
 575         if (offset >= LAPIC_MMIO_LENGTH)
 576                 return 0;
 577
 578         switch (offset) {
 579         case APIC_ID:
 580                 if (apic_x2apic_mode(apic))
 581                         val = kvm_apic_id(apic);
 582                 else
 583                         val = kvm_apic_id(apic) << 24;
 584                 break;
 585         case APIC_ARBPRI:
 586                 apic_debug("Access APIC ARBPRI register which is for P6\n");
 587                 break;
 588
 589         case APIC_TMCCT:        /* Timer CCR */
 590                 if (apic_lvtt_tscdeadline(apic))
 591                         return 0;
 592
 593                 val = apic_get_tmcct(apic);
 594                 break;
 595
 596         case APIC_TASKPRI:
 597                 report_tpr_access(apic, false);
 598                 /* fall thru */
 599         default:
 600                 apic_update_ppr(apic);
 601                 val = apic_get_reg(apic, offset);
 602                 break;
 603         }
 604
 605         return val;
 606 }
 607
 608 static inline struct kvm_lapic *to_lapic(struct kvm_io_device *dev)
 609 {
 610         return container_of(dev, struct kvm_lapic, dev);
 611 }
 612
 613 static int apic_reg_read(struct kvm_lapic *apic, u32 offset, int len,
 614                 void *data)
 615 {
 616         unsigned char alignment = offset & 0xf;
 617         u32 result;
 618         /* this bitmask has a bit cleared for each reserver register */
 619         static const u64 rmask = 0x43ff01ffffffe70cULL;
 620
 621         if ((alignment + len) > 4) {
 622                 apic_debug("KVM_APIC_READ: alignment error %x %d\n",
 623                            offset, len);
 624                 return 1;
 625         }
 626
 627         if (offset > 0x3f0 || !(rmask & (1ULL << (offset >> 4)))) {
 628                 apic_debug("KVM_APIC_READ: read reserved register %x\n",
 629                            offset);
 630                 return 1;
 631         }
 632
 633         result = __apic_read(apic, offset & ~0xf);
 634
 635         trace_kvm_apic_read(offset, result);
 636
 637         switch (len) {
 638         case 1:
 639         case 2:
 640         case 4:
 641                 memcpy(data, (char *)&result + alignment, len);
 642                 break;
 643         default:
 644                 printk(KERN_ERR "Local APIC read with len = %x, "
 645                        "should be 1,2, or 4 instead\n", len);
 646                 break;
 647         }
 648         return 0;
 649 }
 650
 651 static int apic_mmio_in_range(struct kvm_lapic *apic, gpa_t addr)
 652 {
 653         return apic_hw_enabled(apic) &&
 654             addr >= apic->base_address &&
 655             addr < apic->base_address + LAPIC_MMIO_LENGTH;
 656 }
 657
 658 static int apic_mmio_read(struct kvm_io_device *this,
 659                            gpa_t address, int len, void *data)
 660 {
 661         struct kvm_lapic *apic = to_lapic(this);
 662         u32 offset = address - apic->base_address;
 663
 664         if (!apic_mmio_in_range(apic, address))
 665                 return -EOPNOTSUPP;
 666
 667         apic_reg_read(apic, offset, len, data);
 668
 669         return 0;
 670 }
 671
 672 static void update_divide_count(struct kvm_lapic *apic)
 673 {
 674         u32 tmp1, tmp2, tdcr;
 675
 676         tdcr = apic_get_reg(apic, APIC_TDCR);
 677         tmp1 = tdcr & 0xf;
 678         tmp2 = ((tmp1 & 0x3) | ((tmp1 & 0x8) >> 1)) + 1;
 679         apic->divide_count = 0x1 << (tmp2 & 0x7);
 680
 681         apic_debug("timer divide count is 0x%x\n",
 682                                    apic->divide_count);
 683 }
 684
 685 static void start_apic_timer(struct kvm_lapic *apic)
 686 {
 687         ktime_t now;
 688         atomic_set(&apic->lapic_timer.pending, 0);
 689
 690         if (apic_lvtt_period(apic) || apic_lvtt_oneshot(apic)) {
 691                 /* lapic timer in oneshot or peroidic mode */
 692                 now = apic->lapic_timer.timer.base->get_time();
 693                 apic->lapic_timer.period = (u64)apic_get_reg(apic, APIC_TMICT)
 694                             * APIC_BUS_CYCLE_NS * apic->divide_count;
 695
 696                 if (!apic->lapic_timer.period)
 697                         return;
 698                 /*
 699                  * Do not allow the guest to program periodic timers with small
 700                  * interval, since the hrtimers are not throttled by the host
 701                  * scheduler.
 702                  */
 703                 if (apic_lvtt_period(apic)) {
 704                         s64 min_period = min_timer_period_us * 1000LL;
 705
 706                         if (apic->lapic_timer.period < min_period) {
 707                                 pr_info_ratelimited(
 708                                     "kvm: vcpu %i: requested %lld ns "
 709                                     "lapic timer period limited to %lld ns\n",
 710                                     apic->vcpu->vcpu_id,
 711                                     apic->lapic_timer.period, min_period);
 712                                 apic->lapic_timer.period = min_period;
 713                         }
 714                 }
 715
 716                 hrtimer_start(&apic->lapic_timer.timer,
 717                               ktime_add_ns(now, apic->lapic_timer.period),
 718                               HRTIMER_MODE_ABS);
 719
 720                 apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016"
 721                            PRIx64 ", "
 722                            "timer initial count 0x%x, period %lldns, "
 723                            "expire @ 0x%016" PRIx64 ".\n", __func__,
 724                            APIC_BUS_CYCLE_NS, ktime_to_ns(now),
 725                            apic_get_reg(apic, APIC_TMICT),
 726                            apic->lapic_timer.period,
 727                            ktime_to_ns(ktime_add_ns(now,
 728                                         apic->lapic_timer.period)));
 729         } else if (apic_lvtt_tscdeadline(apic)) {
 730                 /* lapic timer in tsc deadline mode */
 731                 u64 guest_tsc, tscdeadline = apic->lapic_timer.tscdeadline;
 732                 u64 ns = 0;
 733                 struct kvm_vcpu *vcpu = apic->vcpu;
 734                 unsigned long this_tsc_khz = vcpu->arch.virtual_tsc_khz;
 735                 unsigned long flags;
 736
 737                 if (unlikely(!tscdeadline || !this_tsc_khz))
 738                         return;
 739
 740                 local_irq_save(flags);
 741
 742                 now = apic->lapic_timer.timer.base->get_time();
 743                 guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu);
 744                 if (likely(tscdeadline > guest_tsc)) {
 745                         ns = (tscdeadline - guest_tsc) * 1000000ULL;
 746                         do_div(ns, this_tsc_khz);
 747                 }
 748                 hrtimer_start(&apic->lapic_timer.timer,
 749                         ktime_add_ns(now, ns), HRTIMER_MODE_ABS);
 750
 751                 local_irq_restore(flags);
 752         }
 753 }
 754
 755 static void apic_manage_nmi_watchdog(struct kvm_lapic *apic, u32 lvt0_val)
 756 {
 757         int nmi_wd_enabled = apic_lvt_nmi_mode(apic_get_reg(apic, APIC_LVT0));
 758
 759         if (apic_lvt_nmi_mode(lvt0_val)) {
 760                 if (!nmi_wd_enabled) {
 761                         apic_debug("Receive NMI setting on APIC_LVT0 "
 762                                    "for cpu %d\n", apic->vcpu->vcpu_id);
 763                         apic->vcpu->kvm->arch.vapics_in_nmi_mode++;
 764                 }
 765         } else if (nmi_wd_enabled)
 766                 apic->vcpu->kvm->arch.vapics_in_nmi_mode--;
 767 }
 768
 769 static int apic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val)
 770 {
 771         int ret = 0;
 772
 773         trace_kvm_apic_write(reg, val);
 774
 775         switch (reg) {
 776         case APIC_ID:           /* Local APIC ID */
 777                 if (!apic_x2apic_mode(apic))
 778                         apic_set_reg(apic, APIC_ID, val);
 779                 else
 780                         ret = 1;
 781                 break;
 782
 783         case APIC_TASKPRI:
 784                 report_tpr_access(apic, true);
 785                 apic_set_tpr(apic, val & 0xff);
 786                 break;
 787
 788         case APIC_EOI:
 789                 apic_set_eoi(apic);
 790                 break;
 791
 792         case APIC_LDR:
 793                 if (!apic_x2apic_mode(apic))
 794                         apic_set_reg(apic, APIC_LDR, val & APIC_LDR_MASK);
 795                 else
 796                         ret = 1;
 797                 break;
 798
 799         case APIC_DFR:
 800                 if (!apic_x2apic_mode(apic))
 801                         apic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
 802                 else
 803                         ret = 1;
 804                 break;
 805
 806         case APIC_SPIV: {
 807                 u32 mask = 0x3ff;
 808                 if (apic_get_reg(apic, APIC_LVR) & APIC_LVR_DIRECTED_EOI)
 809                         mask |= APIC_SPIV_DIRECTED_EOI;
 810                 apic_set_reg(apic, APIC_SPIV, val & mask);
 811                 if (!(val & APIC_SPIV_APIC_ENABLED)) {
 812                         int i;
 813                         u32 lvt_val;
 814
 815                         for (i = 0; i < APIC_LVT_NUM; i++) {
 816                                 lvt_val = apic_get_reg(apic,
 817                                                        APIC_LVTT + 0x10 * i);
 818                                 apic_set_reg(apic, APIC_LVTT + 0x10 * i,
 819                                              lvt_val | APIC_LVT_MASKED);
 820                         }
 821                         atomic_set(&apic->lapic_timer.pending, 0);
 822
 823                 }
 824                 break;
 825         }
 826         case APIC_ICR:
 827                 /* No delay here, so we always clear the pending bit */
 828                 apic_set_reg(apic, APIC_ICR, val & ~(1 << 12));
 829                 apic_send_ipi(apic);
 830                 break;
 831
 832         case APIC_ICR2:
 833                 if (!apic_x2apic_mode(apic))
 834                         val &= 0xff000000;
 835                 apic_set_reg(apic, APIC_ICR2, val);
 836                 break;
 837
 838         case APIC_LVT0:
 839                 apic_manage_nmi_watchdog(apic, val);
 840         case APIC_LVTTHMR:
 841         case APIC_LVTPC:
 842         case APIC_LVT1:
 843         case APIC_LVTERR:
 844                 /* TODO: Check vector */
 845                 if (!apic_sw_enabled(apic))
 846                         val |= APIC_LVT_MASKED;
 847
 848                 val &= apic_lvt_mask[(reg - APIC_LVTT) >> 4];
 849                 apic_set_reg(apic, reg, val);
 850
 851                 break;
 852
 853         case APIC_LVTT:
 854                 if ((apic_get_reg(apic, APIC_LVTT) &
 855                     apic->lapic_timer.timer_mode_mask) !=
 856                    (val & apic->lapic_timer.timer_mode_mask))
 857                         hrtimer_cancel(&apic->lapic_timer.timer);
 858
 859                 if (!apic_sw_enabled(apic))
 860                         val |= APIC_LVT_MASKED;
 861                 val &= (apic_lvt_mask[0] | apic->lapic_timer.timer_mode_mask);
 862                 apic_set_reg(apic, APIC_LVTT, val);
 863                 break;
 864
 865         case APIC_TMICT:
 866                 if (apic_lvtt_tscdeadline(apic))
 867                         break;
 868
 869                 hrtimer_cancel(&apic->lapic_timer.timer);
 870                 apic_set_reg(apic, APIC_TMICT, val);
 871                 start_apic_timer(apic);
 872                 break;
 873
 874         case APIC_TDCR:
 875                 if (val & 4)
 876                         apic_debug("KVM_WRITE:TDCR %x\n", val);
 877                 apic_set_reg(apic, APIC_TDCR, val);
 878                 update_divide_count(apic);
 879                 break;
 880
 881         case APIC_ESR:
 882                 if (apic_x2apic_mode(apic) && val != 0) {
 883                         apic_debug("KVM_WRITE:ESR not zero %x\n", val);
 884                         ret = 1;
 885                 }
 886                 break;
 887
 888         case APIC_SELF_IPI:
 889                 if (apic_x2apic_mode(apic)) {
 890                         apic_reg_write(apic, APIC_ICR, 0x40000 | (val & 0xff));
 891                 } else
 892                         ret = 1;
 893                 break;
 894         default:
 895                 ret = 1;
 896                 break;
 897         }
 898         if (ret)
 899                 apic_debug("Local APIC Write to read-only register %x\n", reg);
 900         return ret;
 901 }
 902
 903 static int apic_mmio_write(struct kvm_io_device *this,
 904                             gpa_t address, int len, const void *data)
 905 {
 906         struct kvm_lapic *apic = to_lapic(this);
 907         unsigned int offset = address - apic->base_address;
 908         u32 val;
 909
 910         if (!apic_mmio_in_range(apic, address))
 911                 return -EOPNOTSUPP;
 912
 913         /*
 914          * APIC register must be aligned on 128-bits boundary.
 915          * 32/64/128 bits registers must be accessed thru 32 bits.
 916          * Refer SDM 8.4.1
 917          */
 918         if (len != 4 || (offset & 0xf)) {
 919                 /* Don't shout loud, $infamous_os would cause only noise. */
 920                 apic_debug("apic write: bad size=%d %lx\n", len, (long)address);
 921                 return 0;
 922         }
 923
 924         val = *(u32*)data;
 925
 926         /* too common printing */
 927         if (offset != APIC_EOI)
 928                 apic_debug("%s: offset 0x%x with length 0x%x, and value is "
 929                            "0x%x\n", __func__, offset, len, val);
 930
 931         apic_reg_write(apic, offset & 0xff0, val);
 932
 933         return 0;
 934 }
 935
 936 void kvm_lapic_set_eoi(struct kvm_vcpu *vcpu)
 937 {
 938         struct kvm_lapic *apic = vcpu->arch.apic;
 939
 940         if (apic)
 941                 apic_reg_write(vcpu->arch.apic, APIC_EOI, 0);
 942 }
 943 EXPORT_SYMBOL_GPL(kvm_lapic_set_eoi);
 944
 945 void kvm_free_lapic(struct kvm_vcpu *vcpu)
 946 {
 947         if (!vcpu->arch.apic)
 948                 return;
 949
 950         hrtimer_cancel(&vcpu->arch.apic->lapic_timer.timer);
 951
 952         if (vcpu->arch.apic->regs)
 953                 free_page((unsigned long)vcpu->arch.apic->regs);
 954
 955         kfree(vcpu->arch.apic);
 956 }
 957
 958 /*
 959  *----------------------------------------------------------------------
 960  * LAPIC interface
 961  *----------------------------------------------------------------------
 962  */
 963
 964 u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu)
 965 {
 966         struct kvm_lapic *apic = vcpu->arch.apic;
 967         if (!apic)
 968                 return 0;
 969
 970         if (apic_lvtt_oneshot(apic) || apic_lvtt_period(apic))
 971                 return 0;
 972
 973         return apic->lapic_timer.tscdeadline;
 974 }
 975
 976 void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu, u64 data)
 977 {
 978         struct kvm_lapic *apic = vcpu->arch.apic;
 979         if (!apic)
 980                 return;
 981
 982         if (apic_lvtt_oneshot(apic) || apic_lvtt_period(apic))
 983                 return;
 984
 985         hrtimer_cancel(&apic->lapic_timer.timer);
 986         apic->lapic_timer.tscdeadline = data;
 987         start_apic_timer(apic);
 988 }
 989
 990 void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8)
 991 {
 992         struct kvm_lapic *apic = vcpu->arch.apic;
 993
 994         if (!apic)
 995                 return;
 996         apic_set_tpr(apic, ((cr8 & 0x0f) << 4)
 997                      | (apic_get_reg(apic, APIC_TASKPRI) & 4));
 998 }
 999
1000 u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
1001 {
1002         struct kvm_lapic *apic = vcpu->arch.apic;
1003         u64 tpr;
1004
1005         if (!apic)
1006                 return 0;
1007         tpr = (u64) apic_get_reg(apic, APIC_TASKPRI);
1008
1009         return (tpr & 0xf0) >> 4;
1010 }
1011
1012 void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
1013 {
1014         struct kvm_lapic *apic = vcpu->arch.apic;
1015
1016         if (!apic) {
1017                 value |= MSR_IA32_APICBASE_BSP;
1018                 vcpu->arch.apic_base = value;
1019                 return;
1020         }
1021
1022         if (!kvm_vcpu_is_bsp(apic->vcpu))
1023                 value &= ~MSR_IA32_APICBASE_BSP;
1024
1025         vcpu->arch.apic_base = value;
1026         if (apic_x2apic_mode(apic)) {
1027                 u32 id = kvm_apic_id(apic);
1028                 u32 ldr = ((id & ~0xf) << 16) | (1 << (id & 0xf));
1029                 apic_set_reg(apic, APIC_LDR, ldr);
1030         }
1031         apic->base_address = apic->vcpu->arch.apic_base &
1032                              MSR_IA32_APICBASE_BASE;
1033
1034         /* with FSB delivery interrupt, we can restart APIC functionality */
1035         apic_debug("apic base msr is 0x%016" PRIx64 ", and base address is "
1036                    "0x%lx.\n", apic->vcpu->arch.apic_base, apic->base_address);
1037
1038 }
1039
1040 void kvm_lapic_reset(struct kvm_vcpu *vcpu)
1041 {
1042         struct kvm_lapic *apic;
1043         int i;
1044
1045         apic_debug("%s\n", __func__);
1046
1047         ASSERT(vcpu);
1048         apic = vcpu->arch.apic;
1049         ASSERT(apic != NULL);
1050
1051         /* Stop the timer in case it's a reset to an active apic */
1052         hrtimer_cancel(&apic->lapic_timer.timer);
1053
1054         apic_set_reg(apic, APIC_ID, vcpu->vcpu_id << 24);
1055         kvm_apic_set_version(apic->vcpu);
1056
1057         for (i = 0; i < APIC_LVT_NUM; i++)
1058                 apic_set_reg(apic, APIC_LVTT + 0x10 * i, APIC_LVT_MASKED);
1059         apic_set_reg(apic, APIC_LVT0,
1060                      SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT));
1061
1062         apic_set_reg(apic, APIC_DFR, 0xffffffffU);
1063         apic_set_reg(apic, APIC_SPIV, 0xff);
1064         apic_set_reg(apic, APIC_TASKPRI, 0);
1065         apic_set_reg(apic, APIC_LDR, 0);
1066         apic_set_reg(apic, APIC_ESR, 0);
1067         apic_set_reg(apic, APIC_ICR, 0);
1068         apic_set_reg(apic, APIC_ICR2, 0);
1069         apic_set_reg(apic, APIC_TDCR, 0);
1070         apic_set_reg(apic, APIC_TMICT, 0);
1071         for (i = 0; i < 8; i++) {
1072                 apic_set_reg(apic, APIC_IRR + 0x10 * i, 0);
1073                 apic_set_reg(apic, APIC_ISR + 0x10 * i, 0);
1074                 apic_set_reg(apic, APIC_TMR + 0x10 * i, 0);
1075         }
1076         apic->irr_pending = false;
1077         update_divide_count(apic);
1078         atomic_set(&apic->lapic_timer.pending, 0);
1079         if (kvm_vcpu_is_bsp(vcpu))
1080                 vcpu->arch.apic_base |= MSR_IA32_APICBASE_BSP;
1081         apic_update_ppr(apic);
1082
1083         vcpu->arch.apic_arb_prio = 0;
1084
1085         apic_debug(KERN_INFO "%s: vcpu=%p, id=%d, base_msr="
1086                    "0x%016" PRIx64 ", base_address=0x%0lx.\n", __func__,
1087                    vcpu, kvm_apic_id(apic),
1088                    vcpu->arch.apic_base, apic->base_address);
1089 }
1090
1091 bool kvm_apic_present(struct kvm_vcpu *vcpu)
1092 {
1093         return vcpu->arch.apic && apic_hw_enabled(vcpu->arch.apic);
1094 }
1095
1096 int kvm_lapic_enabled(struct kvm_vcpu *vcpu)
1097 {
1098         return kvm_apic_present(vcpu) && apic_sw_enabled(vcpu->arch.apic);
1099 }
1100
1101 /*
1102  *----------------------------------------------------------------------
1103  * timer interface
1104  *----------------------------------------------------------------------
1105  */
1106
1107 static bool lapic_is_periodic(struct kvm_timer *ktimer)
1108 {
1109         struct kvm_lapic *apic = container_of(ktimer, struct kvm_lapic,
1110                                               lapic_timer);
1111         return apic_lvtt_period(apic);
1112 }
1113
1114 int apic_has_pending_timer(struct kvm_vcpu *vcpu)
1115 {
1116         struct kvm_lapic *lapic = vcpu->arch.apic;
1117
1118         if (lapic && apic_enabled(lapic) && apic_lvt_enabled(lapic, APIC_LVTT))
1119                 return atomic_read(&lapic->lapic_timer.pending);
1120
1121         return 0;
1122 }
1123
1124 int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type)
1125 {
1126         u32 reg = apic_get_reg(apic, lvt_type);
1127         int vector, mode, trig_mode;
1128
1129         if (apic_hw_enabled(apic) && !(reg & APIC_LVT_MASKED)) {
1130                 vector = reg & APIC_VECTOR_MASK;
1131                 mode = reg & APIC_MODE_MASK;
1132                 trig_mode = reg & APIC_LVT_LEVEL_TRIGGER;
1133                 return __apic_accept_irq(apic, mode, vector, 1, trig_mode);
1134         }
1135         return 0;
1136 }
1137
1138 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu)
1139 {
1140         struct kvm_lapic *apic = vcpu->arch.apic;
1141
1142         if (apic)
1143                 kvm_apic_local_deliver(apic, APIC_LVT0);
1144 }
1145
1146 static struct kvm_timer_ops lapic_timer_ops = {
1147         .is_periodic = lapic_is_periodic,
1148 };
1149
1150 static const struct kvm_io_device_ops apic_mmio_ops = {
1151         .read     = apic_mmio_read,
1152         .write    = apic_mmio_write,
1153 };
1154
1155 int kvm_create_lapic(struct kvm_vcpu *vcpu)
1156 {
1157         struct kvm_lapic *apic;
1158
1159         ASSERT(vcpu != NULL);
1160         apic_debug("apic_init %d\n", vcpu->vcpu_id);
1161
1162         apic = kzalloc(sizeof(*apic), GFP_KERNEL);
1163         if (!apic)
1164                 goto nomem;
1165
1166         vcpu->arch.apic = apic;
1167
1168         apic->regs = (void *)get_zeroed_page(GFP_KERNEL);
1169         if (!apic->regs) {
1170                 printk(KERN_ERR "malloc apic regs error for vcpu %x\n",
1171                        vcpu->vcpu_id);
1172                 goto nomem_free_apic;
1173         }
1174         apic->vcpu = vcpu;
1175
1176         hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC,
1177                      HRTIMER_MODE_ABS);
1178         apic->lapic_timer.timer.function = kvm_timer_fn;
1179         apic->lapic_timer.t_ops = &lapic_timer_ops;
1180         apic->lapic_timer.kvm = vcpu->kvm;
1181         apic->lapic_timer.vcpu = vcpu;
1182
1183         apic->base_address = APIC_DEFAULT_PHYS_BASE;
1184         vcpu->arch.apic_base = APIC_DEFAULT_PHYS_BASE;
1185
1186         kvm_lapic_reset(vcpu);
1187         kvm_iodevice_init(&apic->dev, &apic_mmio_ops);
1188
1189         return 0;
1190 nomem_free_apic:
1191         kfree(apic);
1192 nomem:
1193         return -ENOMEM;
1194 }
1195
1196 int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
1197 {
1198         struct kvm_lapic *apic = vcpu->arch.apic;
1199         int highest_irr;
1200
1201         if (!apic || !apic_enabled(apic))
1202                 return -1;
1203
1204         apic_update_ppr(apic);
1205         highest_irr = apic_find_highest_irr(apic);
1206         if ((highest_irr == -1) ||
1207             ((highest_irr & 0xF0) <= apic_get_reg(apic, APIC_PROCPRI)))
1208                 return -1;
1209         return highest_irr;
1210 }
1211
1212 int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
1213 {
1214         u32 lvt0 = apic_get_reg(vcpu->arch.apic, APIC_LVT0);
1215         int r = 0;
1216
1217         if (!apic_hw_enabled(vcpu->arch.apic))
1218                 r = 1;
1219         if ((lvt0 & APIC_LVT_MASKED) == 0 &&
1220             GET_APIC_DELIVERY_MODE(lvt0) == APIC_MODE_EXTINT)
1221                 r = 1;
1222         return r;
1223 }
1224
1225 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu)
1226 {
1227         struct kvm_lapic *apic = vcpu->arch.apic;
1228
1229         if (apic && atomic_read(&apic->lapic_timer.pending) > 0) {
1230                 if (kvm_apic_local_deliver(apic, APIC_LVTT))
1231                         atomic_dec(&apic->lapic_timer.pending);
1232         }
1233 }
1234
1235 int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
1236 {
1237         int vector = kvm_apic_has_interrupt(vcpu);
1238         struct kvm_lapic *apic = vcpu->arch.apic;
1239
1240         if (vector == -1)
1241                 return -1;
1242
1243         apic_set_vector(vector, apic->regs + APIC_ISR);
1244         apic_update_ppr(apic);
1245         apic_clear_irr(vector, apic);
1246         return vector;
1247 }
1248
1249 void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu)
1250 {
1251         struct kvm_lapic *apic = vcpu->arch.apic;
1252
1253         apic->base_address = vcpu->arch.apic_base &
1254                              MSR_IA32_APICBASE_BASE;
1255         kvm_apic_set_version(vcpu);
1256
1257         apic_update_ppr(apic);
1258         hrtimer_cancel(&apic->lapic_timer.timer);
1259         update_divide_count(apic);
1260         start_apic_timer(apic);
1261         apic->irr_pending = true;
1262         kvm_make_request(KVM_REQ_EVENT, vcpu);
1263 }
1264
1265 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
1266 {
1267         struct kvm_lapic *apic = vcpu->arch.apic;
1268         struct hrtimer *timer;
1269
1270         if (!apic)
1271                 return;
1272
1273         timer = &apic->lapic_timer.timer;
1274         if (hrtimer_cancel(timer))
1275                 hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
1276 }
1277
1278 void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu)
1279 {
1280         u32 data;
1281         void *vapic;
1282
1283         if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr)
1284                 return;
1285
1286         vapic = kmap_atomic(vcpu->arch.apic->vapic_page);
1287         data = *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr));
1288         kunmap_atomic(vapic);
1289
1290         apic_set_tpr(vcpu->arch.apic, data & 0xff);
1291 }
1292
1293 void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu)
1294 {
1295         u32 data, tpr;
1296         int max_irr, max_isr;
1297         struct kvm_lapic *apic;
1298         void *vapic;
1299
1300         if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr)
1301                 return;
1302
1303         apic = vcpu->arch.apic;
1304         tpr = apic_get_reg(apic, APIC_TASKPRI) & 0xff;
1305         max_irr = apic_find_highest_irr(apic);
1306         if (max_irr < 0)
1307                 max_irr = 0;
1308         max_isr = apic_find_highest_isr(apic);
1309         if (max_isr < 0)
1310                 max_isr = 0;
1311         data = (tpr & 0xff) | ((max_isr & 0xf0) << 8) | (max_irr << 24);
1312
1313         vapic = kmap_atomic(vcpu->arch.apic->vapic_page);
1314         *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr)) = data;
1315         kunmap_atomic(vapic);
1316 }
1317
1318 void kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr)
1319 {
1320         if (!irqchip_in_kernel(vcpu->kvm))
1321                 return;
1322
1323         vcpu->arch.apic->vapic_addr = vapic_addr;
1324 }
1325
1326 int kvm_x2apic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1327 {
1328         struct kvm_lapic *apic = vcpu->arch.apic;
1329         u32 reg = (msr - APIC_BASE_MSR) << 4;
1330
1331         if (!irqchip_in_kernel(vcpu->kvm) || !apic_x2apic_mode(apic))
1332                 return 1;
1333
1334         /* if this is ICR write vector before command */
1335         if (msr == 0x830)
1336                 apic_reg_write(apic, APIC_ICR2, (u32)(data >> 32));
1337         return apic_reg_write(apic, reg, (u32)data);
1338 }
1339
1340 int kvm_x2apic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
1341 {
1342         struct kvm_lapic *apic = vcpu->arch.apic;
1343         u32 reg = (msr - APIC_BASE_MSR) << 4, low, high = 0;
1344
1345         if (!irqchip_in_kernel(vcpu->kvm) || !apic_x2apic_mode(apic))
1346                 return 1;
1347
1348         if (apic_reg_read(apic, reg, 4, &low))
1349                 return 1;
1350         if (msr == 0x830)
1351                 apic_reg_read(apic, APIC_ICR2, 4, &high);
1352
1353         *data = (((u64)high) << 32) | low;
1354
1355         return 0;
1356 }
1357
1358 int kvm_hv_vapic_msr_write(struct kvm_vcpu *vcpu, u32 reg, u64 data)
1359 {
1360         struct kvm_lapic *apic = vcpu->arch.apic;
1361
1362         if (!irqchip_in_kernel(vcpu->kvm))
1363                 return 1;
1364
1365         /* if this is ICR write vector before command */
1366         if (reg == APIC_ICR)
1367                 apic_reg_write(apic, APIC_ICR2, (u32)(data >> 32));
1368         return apic_reg_write(apic, reg, (u32)data);
1369 }
1370
1371 int kvm_hv_vapic_msr_read(struct kvm_vcpu *vcpu, u32 reg, u64 *data)
1372 {
1373         struct kvm_lapic *apic = vcpu->arch.apic;
1374         u32 low, high = 0;
1375
1376         if (!irqchip_in_kernel(vcpu->kvm))
1377                 return 1;
1378
1379         if (apic_reg_read(apic, reg, 4, &low))
1380                 return 1;
1381         if (reg == APIC_ICR)
1382                 apic_reg_read(apic, APIC_ICR2, 4, &high);
1383
1384         *data = (((u64)high) << 32) | low;
1385
1386         return 0;
1387 }