arch/x86/kvm/lapic.c

   1
   2 /*
   3  * Local APIC virtualization
   4  *
   5  * Copyright (C) 2006 Qumranet, Inc.
   6  * Copyright (C) 2007 Novell
   7  * Copyright (C) 2007 Intel
   8  * Copyright 2009 Red Hat, Inc. and/or its affiliates.
   9  *
  10  * Authors:
  11  *   Dor Laor <dor.laor@qumranet.com>
  12  *   Gregory Haskins <ghaskins@novell.com>
  13  *   Yaozu (Eddie) Dong <eddie.dong@intel.com>
  14  *
  15  * Based on Xen 3.1 code, Copyright (c) 2004, Intel Corporation.
  16  *
  17  * This work is licensed under the terms of the GNU GPL, version 2.  See
  18  * the COPYING file in the top-level directory.
  19  */
  20
  21 #include <linux/kvm_host.h>
  22 #include <linux/kvm.h>
  23 #include <linux/mm.h>
  24 #include <linux/highmem.h>
  25 #include <linux/smp.h>
  26 #include <linux/hrtimer.h>
  27 #include <linux/io.h>
  28 #include <linux/module.h>
  29 #include <linux/math64.h>
  30 #include <linux/slab.h>
  31 #include <asm/processor.h>
  32 #include <asm/msr.h>
  33 #include <asm/page.h>
  34 #include <asm/current.h>
  35 #include <asm/apicdef.h>
  36 #include <linux/atomic.h>
  37 #include "kvm_cache_regs.h"
  38 #include "irq.h"
  39 #include "trace.h"
  40 #include "x86.h"
  41
  42 #ifndef CONFIG_X86_64
  43 #define mod_64(x, y) ((x) - (y) * div64_u64(x, y))
  44 #else
  45 #define mod_64(x, y) ((x) % (y))
  46 #endif
  47
  48 #define PRId64 "d"
  49 #define PRIx64 "llx"
  50 #define PRIu64 "u"
  51 #define PRIo64 "o"
  52
  53 #define APIC_BUS_CYCLE_NS 1
  54
  55 /* #define apic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) */
  56 #define apic_debug(fmt, arg...)
  57
  58 #define APIC_LVT_NUM                    6
  59 /* 14 is the version for Xeon and Pentium 8.4.8*/
  60 #define APIC_VERSION                    (0x14UL | ((APIC_LVT_NUM - 1) << 16))
  61 #define LAPIC_MMIO_LENGTH               (1 << 12)
  62 /* followed define is not in apicdef.h */
  63 #define APIC_SHORT_MASK                 0xc0000
  64 #define APIC_DEST_NOSHORT               0x0
  65 #define APIC_DEST_MASK                  0x800
  66 #define MAX_APIC_VECTOR                 256
  67
  68 #define VEC_POS(v) ((v) & (32 - 1))
  69 #define REG_POS(v) (((v) >> 5) << 4)
  70
  71 static unsigned int min_timer_period_us = 500;
  72 module_param(min_timer_period_us, uint, S_IRUGO | S_IWUSR);
  73
  74 static inline u32 apic_get_reg(struct kvm_lapic *apic, int reg_off)
  75 {
  76         return *((u32 *) (apic->regs + reg_off));
  77 }
  78
  79 static inline void apic_set_reg(struct kvm_lapic *apic, int reg_off, u32 val)
  80 {
  81         *((u32 *) (apic->regs + reg_off)) = val;
  82 }
  83
  84 static inline int apic_test_and_set_vector(int vec, void *bitmap)
  85 {
  86         return test_and_set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  87 }
  88
  89 static inline int apic_test_and_clear_vector(int vec, void *bitmap)
  90 {
  91         return test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  92 }
  93
  94 static inline void apic_set_vector(int vec, void *bitmap)
  95 {
  96         set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  97 }
  98
  99 static inline void apic_clear_vector(int vec, void *bitmap)
 100 {
 101         clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
 102 }
 103
 104 static inline int apic_hw_enabled(struct kvm_lapic *apic)
 105 {
 106         return (apic)->vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE;
 107 }
 108
 109 static inline int  apic_sw_enabled(struct kvm_lapic *apic)
 110 {
 111         return apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_APIC_ENABLED;
 112 }
 113
 114 static inline int apic_enabled(struct kvm_lapic *apic)
 115 {
 116         return apic_sw_enabled(apic) && apic_hw_enabled(apic);
 117 }
 118
 119 #define LVT_MASK        \
 120         (APIC_LVT_MASKED | APIC_SEND_PENDING | APIC_VECTOR_MASK)
 121
 122 #define LINT_MASK       \
 123         (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
 124          APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
 125
 126 static inline int kvm_apic_id(struct kvm_lapic *apic)
 127 {
 128         return (apic_get_reg(apic, APIC_ID) >> 24) & 0xff;
 129 }
 130
 131 static inline int apic_lvt_enabled(struct kvm_lapic *apic, int lvt_type)
 132 {
 133         return !(apic_get_reg(apic, lvt_type) & APIC_LVT_MASKED);
 134 }
 135
 136 static inline int apic_lvt_vector(struct kvm_lapic *apic, int lvt_type)
 137 {
 138         return apic_get_reg(apic, lvt_type) & APIC_VECTOR_MASK;
 139 }
 140
 141 static inline int apic_lvtt_oneshot(struct kvm_lapic *apic)
 142 {
 143         return ((apic_get_reg(apic, APIC_LVTT) &
 144                 apic->lapic_timer.timer_mode_mask) == APIC_LVT_TIMER_ONESHOT);
 145 }
 146
 147 static inline int apic_lvtt_period(struct kvm_lapic *apic)
 148 {
 149         return ((apic_get_reg(apic, APIC_LVTT) &
 150                 apic->lapic_timer.timer_mode_mask) == APIC_LVT_TIMER_PERIODIC);
 151 }
 152
 153 static inline int apic_lvtt_tscdeadline(struct kvm_lapic *apic)
 154 {
 155         return ((apic_get_reg(apic, APIC_LVTT) &
 156                 apic->lapic_timer.timer_mode_mask) ==
 157                         APIC_LVT_TIMER_TSCDEADLINE);
 158 }
 159
 160 static inline int apic_lvt_nmi_mode(u32 lvt_val)
 161 {
 162         return (lvt_val & (APIC_MODE_MASK | APIC_LVT_MASKED)) == APIC_DM_NMI;
 163 }
 164
 165 void kvm_apic_set_version(struct kvm_vcpu *vcpu)
 166 {
 167         struct kvm_lapic *apic = vcpu->arch.apic;
 168         struct kvm_cpuid_entry2 *feat;
 169         u32 v = APIC_VERSION;
 170
 171         if (!irqchip_in_kernel(vcpu->kvm))
 172                 return;
 173
 174         feat = kvm_find_cpuid_entry(apic->vcpu, 0x1, 0);
 175         if (feat && (feat->ecx & (1 << (X86_FEATURE_X2APIC & 31))))
 176                 v |= APIC_LVR_DIRECTED_EOI;
 177         apic_set_reg(apic, APIC_LVR, v);
 178 }
 179
 180 static inline int apic_x2apic_mode(struct kvm_lapic *apic)
 181 {
 182         return apic->vcpu->arch.apic_base & X2APIC_ENABLE;
 183 }
 184
 185 static unsigned int apic_lvt_mask[APIC_LVT_NUM] = {
 186         LVT_MASK ,      /* part LVTT mask, timer mode mask added at runtime */
 187         LVT_MASK | APIC_MODE_MASK,      /* LVTTHMR */
 188         LVT_MASK | APIC_MODE_MASK,      /* LVTPC */
 189         LINT_MASK, LINT_MASK,   /* LVT0-1 */
 190         LVT_MASK                /* LVTERR */
 191 };
 192
 193 static int find_highest_vector(void *bitmap)
 194 {
 195         u32 *word = bitmap;
 196         int word_offset = MAX_APIC_VECTOR >> 5;
 197
 198         while ((word_offset != 0) && (word[(--word_offset) << 2] == 0))
 199                 continue;
 200
 201         if (likely(!word_offset && !word[0]))
 202                 return -1;
 203         else
 204                 return fls(word[word_offset << 2]) - 1 + (word_offset << 5);
 205 }
 206
 207 static inline int apic_test_and_set_irr(int vec, struct kvm_lapic *apic)
 208 {
 209         apic->irr_pending = true;
 210         return apic_test_and_set_vector(vec, apic->regs + APIC_IRR);
 211 }
 212
 213 static inline int apic_search_irr(struct kvm_lapic *apic)
 214 {
 215         return find_highest_vector(apic->regs + APIC_IRR);
 216 }
 217
 218 static inline int apic_find_highest_irr(struct kvm_lapic *apic)
 219 {
 220         int result;
 221
 222         if (!apic->irr_pending)
 223                 return -1;
 224
 225         result = apic_search_irr(apic);
 226         ASSERT(result == -1 || result >= 16);
 227
 228         return result;
 229 }
 230
 231 static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
 232 {
 233         apic->irr_pending = false;
 234         apic_clear_vector(vec, apic->regs + APIC_IRR);
 235         if (apic_search_irr(apic) != -1)
 236                 apic->irr_pending = true;
 237 }
 238
 239 int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
 240 {
 241         struct kvm_lapic *apic = vcpu->arch.apic;
 242         int highest_irr;
 243
 244         /* This may race with setting of irr in __apic_accept_irq() and
 245          * value returned may be wrong, but kvm_vcpu_kick() in __apic_accept_irq
 246          * will cause vmexit immediately and the value will be recalculated
 247          * on the next vmentry.
 248          */
 249         if (!apic)
 250                 return 0;
 251         highest_irr = apic_find_highest_irr(apic);
 252
 253         return highest_irr;
 254 }
 255
 256 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
 257                              int vector, int level, int trig_mode);
 258
 259 int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq)
 260 {
 261         struct kvm_lapic *apic = vcpu->arch.apic;
 262
 263         return __apic_accept_irq(apic, irq->delivery_mode, irq->vector,
 264                         irq->level, irq->trig_mode);
 265 }
 266
 267 static inline int apic_find_highest_isr(struct kvm_lapic *apic)
 268 {
 269         int result;
 270
 271         result = find_highest_vector(apic->regs + APIC_ISR);
 272         ASSERT(result == -1 || result >= 16);
 273
 274         return result;
 275 }
 276
 277 static void apic_update_ppr(struct kvm_lapic *apic)
 278 {
 279         u32 tpr, isrv, ppr, old_ppr;
 280         int isr;
 281
 282         old_ppr = apic_get_reg(apic, APIC_PROCPRI);
 283         tpr = apic_get_reg(apic, APIC_TASKPRI);
 284         isr = apic_find_highest_isr(apic);
 285         isrv = (isr != -1) ? isr : 0;
 286
 287         if ((tpr & 0xf0) >= (isrv & 0xf0))
 288                 ppr = tpr & 0xff;
 289         else
 290                 ppr = isrv & 0xf0;
 291
 292         apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x",
 293                    apic, ppr, isr, isrv);
 294
 295         if (old_ppr != ppr) {
 296                 apic_set_reg(apic, APIC_PROCPRI, ppr);
 297                 if (ppr < old_ppr)
 298                         kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
 299         }
 300 }
 301
 302 static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
 303 {
 304         apic_set_reg(apic, APIC_TASKPRI, tpr);
 305         apic_update_ppr(apic);
 306 }
 307
 308 int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest)
 309 {
 310         return dest == 0xff || kvm_apic_id(apic) == dest;
 311 }
 312
 313 int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda)
 314 {
 315         int result = 0;
 316         u32 logical_id;
 317
 318         if (apic_x2apic_mode(apic)) {
 319                 logical_id = apic_get_reg(apic, APIC_LDR);
 320                 return logical_id & mda;
 321         }
 322
 323         logical_id = GET_APIC_LOGICAL_ID(apic_get_reg(apic, APIC_LDR));
 324
 325         switch (apic_get_reg(apic, APIC_DFR)) {
 326         case APIC_DFR_FLAT:
 327                 if (logical_id & mda)
 328                         result = 1;
 329                 break;
 330         case APIC_DFR_CLUSTER:
 331                 if (((logical_id >> 4) == (mda >> 0x4))
 332                     && (logical_id & mda & 0xf))
 333                         result = 1;
 334                 break;
 335         default:
 336                 apic_debug("Bad DFR vcpu %d: %08x\n",
 337                            apic->vcpu->vcpu_id, apic_get_reg(apic, APIC_DFR));
 338                 break;
 339         }
 340
 341         return result;
 342 }
 343
 344 int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
 345                            int short_hand, int dest, int dest_mode)
 346 {
 347         int result = 0;
 348         struct kvm_lapic *target = vcpu->arch.apic;
 349
 350         apic_debug("target %p, source %p, dest 0x%x, "
 351                    "dest_mode 0x%x, short_hand 0x%x\n",
 352                    target, source, dest, dest_mode, short_hand);
 353
 354         ASSERT(target);
 355         switch (short_hand) {
 356         case APIC_DEST_NOSHORT:
 357                 if (dest_mode == 0)
 358                         /* Physical mode. */
 359                         result = kvm_apic_match_physical_addr(target, dest);
 360                 else
 361                         /* Logical mode. */
 362                         result = kvm_apic_match_logical_addr(target, dest);
 363                 break;
 364         case APIC_DEST_SELF:
 365                 result = (target == source);
 366                 break;
 367         case APIC_DEST_ALLINC:
 368                 result = 1;
 369                 break;
 370         case APIC_DEST_ALLBUT:
 371                 result = (target != source);
 372                 break;
 373         default:
 374                 apic_debug("kvm: apic: Bad dest shorthand value %x\n",
 375                            short_hand);
 376                 break;
 377         }
 378
 379         return result;
 380 }
 381
 382 /*
 383  * Add a pending IRQ into lapic.
 384  * Return 1 if successfully added and 0 if discarded.
 385  */
 386 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
 387                              int vector, int level, int trig_mode)
 388 {
 389         int result = 0;
 390         struct kvm_vcpu *vcpu = apic->vcpu;
 391
 392         switch (delivery_mode) {
 393         case APIC_DM_LOWEST:
 394                 vcpu->arch.apic_arb_prio++;
 395         case APIC_DM_FIXED:
 396                 /* FIXME add logic for vcpu on reset */
 397                 if (unlikely(!apic_enabled(apic)))
 398                         break;
 399
 400                 if (trig_mode) {
 401                         apic_debug("level trig mode for vector %d", vector);
 402                         apic_set_vector(vector, apic->regs + APIC_TMR);
 403                 } else
 404                         apic_clear_vector(vector, apic->regs + APIC_TMR);
 405
 406                 result = !apic_test_and_set_irr(vector, apic);
 407                 trace_kvm_apic_accept_irq(vcpu->vcpu_id, delivery_mode,
 408                                           trig_mode, vector, !result);
 409                 if (!result) {
 410                         if (trig_mode)
 411                                 apic_debug("level trig mode repeatedly for "
 412                                                 "vector %d", vector);
 413                         break;
 414                 }
 415
 416                 kvm_make_request(KVM_REQ_EVENT, vcpu);
 417                 kvm_vcpu_kick(vcpu);
 418                 break;
 419
 420         case APIC_DM_REMRD:
 421                 apic_debug("Ignoring delivery mode 3\n");
 422                 break;
 423
 424         case APIC_DM_SMI:
 425                 apic_debug("Ignoring guest SMI\n");
 426                 break;
 427
 428         case APIC_DM_NMI:
 429                 result = 1;
 430                 kvm_inject_nmi(vcpu);
 431                 kvm_vcpu_kick(vcpu);
 432                 break;
 433
 434         case APIC_DM_INIT:
 435                 if (level) {
 436                         result = 1;
 437                         vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
 438                         kvm_make_request(KVM_REQ_EVENT, vcpu);
 439                         kvm_vcpu_kick(vcpu);
 440                 } else {
 441                         apic_debug("Ignoring de-assert INIT to vcpu %d\n",
 442                                    vcpu->vcpu_id);
 443                 }
 444                 break;
 445
 446         case APIC_DM_STARTUP:
 447                 apic_debug("SIPI to vcpu %d vector 0x%02x\n",
 448                            vcpu->vcpu_id, vector);
 449                 if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
 450                         result = 1;
 451                         vcpu->arch.sipi_vector = vector;
 452                         vcpu->arch.mp_state = KVM_MP_STATE_SIPI_RECEIVED;
 453                         kvm_make_request(KVM_REQ_EVENT, vcpu);
 454                         kvm_vcpu_kick(vcpu);
 455                 }
 456                 break;
 457
 458         case APIC_DM_EXTINT:
 459                 /*
 460                  * Should only be called by kvm_apic_local_deliver() with LVT0,
 461                  * before NMI watchdog was enabled. Already handled by
 462                  * kvm_apic_accept_pic_intr().
 463                  */
 464                 break;
 465
 466         default:
 467                 printk(KERN_ERR "TODO: unsupported delivery mode %x\n",
 468                        delivery_mode);
 469                 break;
 470         }
 471         return result;
 472 }
 473
 474 int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2)
 475 {
 476         return vcpu1->arch.apic_arb_prio - vcpu2->arch.apic_arb_prio;
 477 }
 478
 479 static void apic_set_eoi(struct kvm_lapic *apic)
 480 {
 481         int vector = apic_find_highest_isr(apic);
 482         int trigger_mode;
 483         /*
 484          * Not every write EOI will has corresponding ISR,
 485          * one example is when Kernel check timer on setup_IO_APIC
 486          */
 487         if (vector == -1)
 488                 return;
 489
 490         apic_clear_vector(vector, apic->regs + APIC_ISR);
 491         apic_update_ppr(apic);
 492
 493         if (apic_test_and_clear_vector(vector, apic->regs + APIC_TMR))
 494                 trigger_mode = IOAPIC_LEVEL_TRIG;
 495         else
 496                 trigger_mode = IOAPIC_EDGE_TRIG;
 497         if (!(apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_DIRECTED_EOI))
 498                 kvm_ioapic_update_eoi(apic->vcpu->kvm, vector, trigger_mode);
 499         kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
 500 }
 501
 502 static void apic_send_ipi(struct kvm_lapic *apic)
 503 {
 504         u32 icr_low = apic_get_reg(apic, APIC_ICR);
 505         u32 icr_high = apic_get_reg(apic, APIC_ICR2);
 506         struct kvm_lapic_irq irq;
 507
 508         irq.vector = icr_low & APIC_VECTOR_MASK;
 509         irq.delivery_mode = icr_low & APIC_MODE_MASK;
 510         irq.dest_mode = icr_low & APIC_DEST_MASK;
 511         irq.level = icr_low & APIC_INT_ASSERT;
 512         irq.trig_mode = icr_low & APIC_INT_LEVELTRIG;
 513         irq.shorthand = icr_low & APIC_SHORT_MASK;
 514         if (apic_x2apic_mode(apic))
 515                 irq.dest_id = icr_high;
 516         else
 517                 irq.dest_id = GET_APIC_DEST_FIELD(icr_high);
 518
 519         trace_kvm_apic_ipi(icr_low, irq.dest_id);
 520
 521         apic_debug("icr_high 0x%x, icr_low 0x%x, "
 522                    "short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
 523                    "dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x\n",
 524                    icr_high, icr_low, irq.shorthand, irq.dest_id,
 525                    irq.trig_mode, irq.level, irq.dest_mode, irq.delivery_mode,
 526                    irq.vector);
 527
 528         kvm_irq_delivery_to_apic(apic->vcpu->kvm, apic, &irq);
 529 }
 530
 531 static u32 apic_get_tmcct(struct kvm_lapic *apic)
 532 {
 533         ktime_t remaining;
 534         s64 ns;
 535         u32 tmcct;
 536
 537         ASSERT(apic != NULL);
 538
 539         /* if initial count is 0, current count should also be 0 */
 540         if (apic_get_reg(apic, APIC_TMICT) == 0)
 541                 return 0;
 542
 543         remaining = hrtimer_get_remaining(&apic->lapic_timer.timer);
 544         if (ktime_to_ns(remaining) < 0)
 545                 remaining = ktime_set(0, 0);
 546
 547         ns = mod_64(ktime_to_ns(remaining), apic->lapic_timer.period);
 548         tmcct = div64_u64(ns,
 549                          (APIC_BUS_CYCLE_NS * apic->divide_count));
 550
 551         return tmcct;
 552 }
 553
 554 static void __report_tpr_access(struct kvm_lapic *apic, bool write)
 555 {
 556         struct kvm_vcpu *vcpu = apic->vcpu;
 557         struct kvm_run *run = vcpu->run;
 558
 559         kvm_make_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu);
 560         run->tpr_access.rip = kvm_rip_read(vcpu);
 561         run->tpr_access.is_write = write;
 562 }
 563
 564 static inline void report_tpr_access(struct kvm_lapic *apic, bool write)
 565 {
 566         if (apic->vcpu->arch.tpr_access_reporting)
 567                 __report_tpr_access(apic, write);
 568 }
 569
 570 static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset)
 571 {
 572         u32 val = 0;
 573
 574         if (offset >= LAPIC_MMIO_LENGTH)
 575                 return 0;
 576
 577         switch (offset) {
 578         case APIC_ID:
 579                 if (apic_x2apic_mode(apic))
 580                         val = kvm_apic_id(apic);
 581                 else
 582                         val = kvm_apic_id(apic) << 24;
 583                 break;
 584         case APIC_ARBPRI:
 585                 apic_debug("Access APIC ARBPRI register which is for P6\n");
 586                 break;
 587
 588         case APIC_TMCCT:        /* Timer CCR */
 589                 if (apic_lvtt_tscdeadline(apic))
 590                         return 0;
 591
 592                 val = apic_get_tmcct(apic);
 593                 break;
 594
 595         case APIC_TASKPRI:
 596                 report_tpr_access(apic, false);
 597                 /* fall thru */
 598         default:
 599                 apic_update_ppr(apic);
 600                 val = apic_get_reg(apic, offset);
 601                 break;
 602         }
 603
 604         return val;
 605 }
 606
 607 static inline struct kvm_lapic *to_lapic(struct kvm_io_device *dev)
 608 {
 609         return container_of(dev, struct kvm_lapic, dev);
 610 }
 611
 612 static int apic_reg_read(struct kvm_lapic *apic, u32 offset, int len,
 613                 void *data)
 614 {
 615         unsigned char alignment = offset & 0xf;
 616         u32 result;
 617         /* this bitmask has a bit cleared for each reserver register */
 618         static const u64 rmask = 0x43ff01ffffffe70cULL;
 619
 620         if ((alignment + len) > 4) {
 621                 apic_debug("KVM_APIC_READ: alignment error %x %d\n",
 622                            offset, len);
 623                 return 1;
 624         }
 625
 626         if (offset > 0x3f0 || !(rmask & (1ULL << (offset >> 4)))) {
 627                 apic_debug("KVM_APIC_READ: read reserved register %x\n",
 628                            offset);
 629                 return 1;
 630         }
 631
 632         result = __apic_read(apic, offset & ~0xf);
 633
 634         trace_kvm_apic_read(offset, result);
 635
 636         switch (len) {
 637         case 1:
 638         case 2:
 639         case 4:
 640                 memcpy(data, (char *)&result + alignment, len);
 641                 break;
 642         default:
 643                 printk(KERN_ERR "Local APIC read with len = %x, "
 644                        "should be 1,2, or 4 instead\n", len);
 645                 break;
 646         }
 647         return 0;
 648 }
 649
 650 static int apic_mmio_in_range(struct kvm_lapic *apic, gpa_t addr)
 651 {
 652         return apic_hw_enabled(apic) &&
 653             addr >= apic->base_address &&
 654             addr < apic->base_address + LAPIC_MMIO_LENGTH;
 655 }
 656
 657 static int apic_mmio_read(struct kvm_io_device *this,
 658                            gpa_t address, int len, void *data)
 659 {
 660         struct kvm_lapic *apic = to_lapic(this);
 661         u32 offset = address - apic->base_address;
 662
 663         if (!apic_mmio_in_range(apic, address))
 664                 return -EOPNOTSUPP;
 665
 666         apic_reg_read(apic, offset, len, data);
 667
 668         return 0;
 669 }
 670
 671 static void update_divide_count(struct kvm_lapic *apic)
 672 {
 673         u32 tmp1, tmp2, tdcr;
 674
 675         tdcr = apic_get_reg(apic, APIC_TDCR);
 676         tmp1 = tdcr & 0xf;
 677         tmp2 = ((tmp1 & 0x3) | ((tmp1 & 0x8) >> 1)) + 1;
 678         apic->divide_count = 0x1 << (tmp2 & 0x7);
 679
 680         apic_debug("timer divide count is 0x%x\n",
 681                                    apic->divide_count);
 682 }
 683
 684 static void start_apic_timer(struct kvm_lapic *apic)
 685 {
 686         ktime_t now;
 687         atomic_set(&apic->lapic_timer.pending, 0);
 688
 689         if (apic_lvtt_period(apic) || apic_lvtt_oneshot(apic)) {
 690                 /* lapic timer in oneshot or peroidic mode */
 691                 now = apic->lapic_timer.timer.base->get_time();
 692                 apic->lapic_timer.period = (u64)apic_get_reg(apic, APIC_TMICT)
 693                             * APIC_BUS_CYCLE_NS * apic->divide_count;
 694
 695                 if (!apic->lapic_timer.period)
 696                         return;
 697                 /*
 698                  * Do not allow the guest to program periodic timers with small
 699                  * interval, since the hrtimers are not throttled by the host
 700                  * scheduler.
 701                  */
 702                 if (apic_lvtt_period(apic)) {
 703                         s64 min_period = min_timer_period_us * 1000LL;
 704
 705                         if (apic->lapic_timer.period < min_period) {
 706                                 pr_info_ratelimited(
 707                                     "kvm: vcpu %i: requested %lld ns "
 708                                     "lapic timer period limited to %lld ns\n",
 709                                     apic->vcpu->vcpu_id,
 710                                     apic->lapic_timer.period, min_period);
 711                                 apic->lapic_timer.period = min_period;
 712                         }
 713                 }
 714
 715                 hrtimer_start(&apic->lapic_timer.timer,
 716                               ktime_add_ns(now, apic->lapic_timer.period),
 717                               HRTIMER_MODE_ABS);
 718
 719                 apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016"
 720                            PRIx64 ", "
 721                            "timer initial count 0x%x, period %lldns, "
 722                            "expire @ 0x%016" PRIx64 ".\n", __func__,
 723                            APIC_BUS_CYCLE_NS, ktime_to_ns(now),
 724                            apic_get_reg(apic, APIC_TMICT),
 725                            apic->lapic_timer.period,
 726                            ktime_to_ns(ktime_add_ns(now,
 727                                         apic->lapic_timer.period)));
 728         } else if (apic_lvtt_tscdeadline(apic)) {
 729                 /* lapic timer in tsc deadline mode */
 730                 u64 guest_tsc, tscdeadline = apic->lapic_timer.tscdeadline;
 731                 u64 ns = 0;
 732                 struct kvm_vcpu *vcpu = apic->vcpu;
 733                 unsigned long this_tsc_khz = vcpu_tsc_khz(vcpu);
 734                 unsigned long flags;
 735
 736                 if (unlikely(!tscdeadline || !this_tsc_khz))
 737                         return;
 738
 739                 local_irq_save(flags);
 740
 741                 now = apic->lapic_timer.timer.base->get_time();
 742                 guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu);
 743                 if (likely(tscdeadline > guest_tsc)) {
 744                         ns = (tscdeadline - guest_tsc) * 1000000ULL;
 745                         do_div(ns, this_tsc_khz);
 746                 }
 747                 hrtimer_start(&apic->lapic_timer.timer,
 748                         ktime_add_ns(now, ns), HRTIMER_MODE_ABS);
 749
 750                 local_irq_restore(flags);
 751         }
 752 }
 753
 754 static void apic_manage_nmi_watchdog(struct kvm_lapic *apic, u32 lvt0_val)
 755 {
 756         int nmi_wd_enabled = apic_lvt_nmi_mode(apic_get_reg(apic, APIC_LVT0));
 757
 758         if (apic_lvt_nmi_mode(lvt0_val)) {
 759                 if (!nmi_wd_enabled) {
 760                         apic_debug("Receive NMI setting on APIC_LVT0 "
 761                                    "for cpu %d\n", apic->vcpu->vcpu_id);
 762                         apic->vcpu->kvm->arch.vapics_in_nmi_mode++;
 763                 }
 764         } else if (nmi_wd_enabled)
 765                 apic->vcpu->kvm->arch.vapics_in_nmi_mode--;
 766 }
 767
 768 static int apic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val)
 769 {
 770         int ret = 0;
 771
 772         trace_kvm_apic_write(reg, val);
 773
 774         switch (reg) {
 775         case APIC_ID:           /* Local APIC ID */
 776                 if (!apic_x2apic_mode(apic))
 777                         apic_set_reg(apic, APIC_ID, val);
 778                 else
 779                         ret = 1;
 780                 break;
 781
 782         case APIC_TASKPRI:
 783                 report_tpr_access(apic, true);
 784                 apic_set_tpr(apic, val & 0xff);
 785                 break;
 786
 787         case APIC_EOI:
 788                 apic_set_eoi(apic);
 789                 break;
 790
 791         case APIC_LDR:
 792                 if (!apic_x2apic_mode(apic))
 793                         apic_set_reg(apic, APIC_LDR, val & APIC_LDR_MASK);
 794                 else
 795                         ret = 1;
 796                 break;
 797
 798         case APIC_DFR:
 799                 if (!apic_x2apic_mode(apic))
 800                         apic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
 801                 else
 802                         ret = 1;
 803                 break;
 804
 805         case APIC_SPIV: {
 806                 u32 mask = 0x3ff;
 807                 if (apic_get_reg(apic, APIC_LVR) & APIC_LVR_DIRECTED_EOI)
 808                         mask |= APIC_SPIV_DIRECTED_EOI;
 809                 apic_set_reg(apic, APIC_SPIV, val & mask);
 810                 if (!(val & APIC_SPIV_APIC_ENABLED)) {
 811                         int i;
 812                         u32 lvt_val;
 813
 814                         for (i = 0; i < APIC_LVT_NUM; i++) {
 815                                 lvt_val = apic_get_reg(apic,
 816                                                        APIC_LVTT + 0x10 * i);
 817                                 apic_set_reg(apic, APIC_LVTT + 0x10 * i,
 818                                              lvt_val | APIC_LVT_MASKED);
 819                         }
 820                         atomic_set(&apic->lapic_timer.pending, 0);
 821
 822                 }
 823                 break;
 824         }
 825         case APIC_ICR:
 826                 /* No delay here, so we always clear the pending bit */
 827                 apic_set_reg(apic, APIC_ICR, val & ~(1 << 12));
 828                 apic_send_ipi(apic);
 829                 break;
 830
 831         case APIC_ICR2:
 832                 if (!apic_x2apic_mode(apic))
 833                         val &= 0xff000000;
 834                 apic_set_reg(apic, APIC_ICR2, val);
 835                 break;
 836
 837         case APIC_LVT0:
 838                 apic_manage_nmi_watchdog(apic, val);
 839         case APIC_LVTTHMR:
 840         case APIC_LVTPC:
 841         case APIC_LVT1:
 842         case APIC_LVTERR:
 843                 /* TODO: Check vector */
 844                 if (!apic_sw_enabled(apic))
 845                         val |= APIC_LVT_MASKED;
 846
 847                 val &= apic_lvt_mask[(reg - APIC_LVTT) >> 4];
 848                 apic_set_reg(apic, reg, val);
 849
 850                 break;
 851
 852         case APIC_LVTT:
 853                 if ((apic_get_reg(apic, APIC_LVTT) &
 854                     apic->lapic_timer.timer_mode_mask) !=
 855                    (val & apic->lapic_timer.timer_mode_mask))
 856                         hrtimer_cancel(&apic->lapic_timer.timer);
 857
 858                 if (!apic_sw_enabled(apic))
 859                         val |= APIC_LVT_MASKED;
 860                 val &= (apic_lvt_mask[0] | apic->lapic_timer.timer_mode_mask);
 861                 apic_set_reg(apic, APIC_LVTT, val);
 862                 break;
 863
 864         case APIC_TMICT:
 865                 if (apic_lvtt_tscdeadline(apic))
 866                         break;
 867
 868                 hrtimer_cancel(&apic->lapic_timer.timer);
 869                 apic_set_reg(apic, APIC_TMICT, val);
 870                 start_apic_timer(apic);
 871                 break;
 872
 873         case APIC_TDCR:
 874                 if (val & 4)
 875                         apic_debug("KVM_WRITE:TDCR %x\n", val);
 876                 apic_set_reg(apic, APIC_TDCR, val);
 877                 update_divide_count(apic);
 878                 break;
 879
 880         case APIC_ESR:
 881                 if (apic_x2apic_mode(apic) && val != 0) {
 882                         apic_debug("KVM_WRITE:ESR not zero %x\n", val);
 883                         ret = 1;
 884                 }
 885                 break;
 886
 887         case APIC_SELF_IPI:
 888                 if (apic_x2apic_mode(apic)) {
 889                         apic_reg_write(apic, APIC_ICR, 0x40000 | (val & 0xff));
 890                 } else
 891                         ret = 1;
 892                 break;
 893         default:
 894                 ret = 1;
 895                 break;
 896         }
 897         if (ret)
 898                 apic_debug("Local APIC Write to read-only register %x\n", reg);
 899         return ret;
 900 }
 901
 902 static int apic_mmio_write(struct kvm_io_device *this,
 903                             gpa_t address, int len, const void *data)
 904 {
 905         struct kvm_lapic *apic = to_lapic(this);
 906         unsigned int offset = address - apic->base_address;
 907         u32 val;
 908
 909         if (!apic_mmio_in_range(apic, address))
 910                 return -EOPNOTSUPP;
 911
 912         /*
 913          * APIC register must be aligned on 128-bits boundary.
 914          * 32/64/128 bits registers must be accessed thru 32 bits.
 915          * Refer SDM 8.4.1
 916          */
 917         if (len != 4 || (offset & 0xf)) {
 918                 /* Don't shout loud, $infamous_os would cause only noise. */
 919                 apic_debug("apic write: bad size=%d %lx\n", len, (long)address);
 920                 return 0;
 921         }
 922
 923         val = *(u32*)data;
 924
 925         /* too common printing */
 926         if (offset != APIC_EOI)
 927                 apic_debug("%s: offset 0x%x with length 0x%x, and value is "
 928                            "0x%x\n", __func__, offset, len, val);
 929
 930         apic_reg_write(apic, offset & 0xff0, val);
 931
 932         return 0;
 933 }
 934
 935 void kvm_lapic_set_eoi(struct kvm_vcpu *vcpu)
 936 {
 937         struct kvm_lapic *apic = vcpu->arch.apic;
 938
 939         if (apic)
 940                 apic_reg_write(vcpu->arch.apic, APIC_EOI, 0);
 941 }
 942 EXPORT_SYMBOL_GPL(kvm_lapic_set_eoi);
 943
 944 void kvm_free_lapic(struct kvm_vcpu *vcpu)
 945 {
 946         if (!vcpu->arch.apic)
 947                 return;
 948
 949         hrtimer_cancel(&vcpu->arch.apic->lapic_timer.timer);
 950
 951         if (vcpu->arch.apic->regs)
 952                 free_page((unsigned long)vcpu->arch.apic->regs);
 953
 954         kfree(vcpu->arch.apic);
 955 }
 956
 957 /*
 958  *----------------------------------------------------------------------
 959  * LAPIC interface
 960  *----------------------------------------------------------------------
 961  */
 962
 963 u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu)
 964 {
 965         struct kvm_lapic *apic = vcpu->arch.apic;
 966         if (!apic)
 967                 return 0;
 968
 969         if (apic_lvtt_oneshot(apic) || apic_lvtt_period(apic))
 970                 return 0;
 971
 972         return apic->lapic_timer.tscdeadline;
 973 }
 974
 975 void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu, u64 data)
 976 {
 977         struct kvm_lapic *apic = vcpu->arch.apic;
 978         if (!apic)
 979                 return;
 980
 981         if (apic_lvtt_oneshot(apic) || apic_lvtt_period(apic))
 982                 return;
 983
 984         hrtimer_cancel(&apic->lapic_timer.timer);
 985         apic->lapic_timer.tscdeadline = data;
 986         start_apic_timer(apic);
 987 }
 988
 989 void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8)
 990 {
 991         struct kvm_lapic *apic = vcpu->arch.apic;
 992
 993         if (!apic)
 994                 return;
 995         apic_set_tpr(apic, ((cr8 & 0x0f) << 4)
 996                      | (apic_get_reg(apic, APIC_TASKPRI) & 4));
 997 }
 998
 999 u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
1000 {
1001         struct kvm_lapic *apic = vcpu->arch.apic;
1002         u64 tpr;
1003
1004         if (!apic)
1005                 return 0;
1006         tpr = (u64) apic_get_reg(apic, APIC_TASKPRI);
1007
1008         return (tpr & 0xf0) >> 4;
1009 }
1010
1011 void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
1012 {
1013         struct kvm_lapic *apic = vcpu->arch.apic;
1014
1015         if (!apic) {
1016                 value |= MSR_IA32_APICBASE_BSP;
1017                 vcpu->arch.apic_base = value;
1018                 return;
1019         }
1020
1021         if (!kvm_vcpu_is_bsp(apic->vcpu))
1022                 value &= ~MSR_IA32_APICBASE_BSP;
1023
1024         vcpu->arch.apic_base = value;
1025         if (apic_x2apic_mode(apic)) {
1026                 u32 id = kvm_apic_id(apic);
1027                 u32 ldr = ((id & ~0xf) << 16) | (1 << (id & 0xf));
1028                 apic_set_reg(apic, APIC_LDR, ldr);
1029         }
1030         apic->base_address = apic->vcpu->arch.apic_base &
1031                              MSR_IA32_APICBASE_BASE;
1032
1033         /* with FSB delivery interrupt, we can restart APIC functionality */
1034         apic_debug("apic base msr is 0x%016" PRIx64 ", and base address is "
1035                    "0x%lx.\n", apic->vcpu->arch.apic_base, apic->base_address);
1036
1037 }
1038
1039 void kvm_lapic_reset(struct kvm_vcpu *vcpu)
1040 {
1041         struct kvm_lapic *apic;
1042         int i;
1043
1044         apic_debug("%s\n", __func__);
1045
1046         ASSERT(vcpu);
1047         apic = vcpu->arch.apic;
1048         ASSERT(apic != NULL);
1049
1050         /* Stop the timer in case it's a reset to an active apic */
1051         hrtimer_cancel(&apic->lapic_timer.timer);
1052
1053         apic_set_reg(apic, APIC_ID, vcpu->vcpu_id << 24);
1054         kvm_apic_set_version(apic->vcpu);
1055
1056         for (i = 0; i < APIC_LVT_NUM; i++)
1057                 apic_set_reg(apic, APIC_LVTT + 0x10 * i, APIC_LVT_MASKED);
1058         apic_set_reg(apic, APIC_LVT0,
1059                      SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT));
1060
1061         apic_set_reg(apic, APIC_DFR, 0xffffffffU);
1062         apic_set_reg(apic, APIC_SPIV, 0xff);
1063         apic_set_reg(apic, APIC_TASKPRI, 0);
1064         apic_set_reg(apic, APIC_LDR, 0);
1065         apic_set_reg(apic, APIC_ESR, 0);
1066         apic_set_reg(apic, APIC_ICR, 0);
1067         apic_set_reg(apic, APIC_ICR2, 0);
1068         apic_set_reg(apic, APIC_TDCR, 0);
1069         apic_set_reg(apic, APIC_TMICT, 0);
1070         for (i = 0; i < 8; i++) {
1071                 apic_set_reg(apic, APIC_IRR + 0x10 * i, 0);
1072                 apic_set_reg(apic, APIC_ISR + 0x10 * i, 0);
1073                 apic_set_reg(apic, APIC_TMR + 0x10 * i, 0);
1074         }
1075         apic->irr_pending = false;
1076         update_divide_count(apic);
1077         atomic_set(&apic->lapic_timer.pending, 0);
1078         if (kvm_vcpu_is_bsp(vcpu))
1079                 vcpu->arch.apic_base |= MSR_IA32_APICBASE_BSP;
1080         apic_update_ppr(apic);
1081
1082         vcpu->arch.apic_arb_prio = 0;
1083
1084         apic_debug(KERN_INFO "%s: vcpu=%p, id=%d, base_msr="
1085                    "0x%016" PRIx64 ", base_address=0x%0lx.\n", __func__,
1086                    vcpu, kvm_apic_id(apic),
1087                    vcpu->arch.apic_base, apic->base_address);
1088 }
1089
1090 bool kvm_apic_present(struct kvm_vcpu *vcpu)
1091 {
1092         return vcpu->arch.apic && apic_hw_enabled(vcpu->arch.apic);
1093 }
1094
1095 int kvm_lapic_enabled(struct kvm_vcpu *vcpu)
1096 {
1097         return kvm_apic_present(vcpu) && apic_sw_enabled(vcpu->arch.apic);
1098 }
1099
1100 /*
1101  *----------------------------------------------------------------------
1102  * timer interface
1103  *----------------------------------------------------------------------
1104  */
1105
1106 static bool lapic_is_periodic(struct kvm_timer *ktimer)
1107 {
1108         struct kvm_lapic *apic = container_of(ktimer, struct kvm_lapic,
1109                                               lapic_timer);
1110         return apic_lvtt_period(apic);
1111 }
1112
1113 int apic_has_pending_timer(struct kvm_vcpu *vcpu)
1114 {
1115         struct kvm_lapic *lapic = vcpu->arch.apic;
1116
1117         if (lapic && apic_enabled(lapic) && apic_lvt_enabled(lapic, APIC_LVTT))
1118                 return atomic_read(&lapic->lapic_timer.pending);
1119
1120         return 0;
1121 }
1122
1123 static int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type)
1124 {
1125         u32 reg = apic_get_reg(apic, lvt_type);
1126         int vector, mode, trig_mode;
1127
1128         if (apic_hw_enabled(apic) && !(reg & APIC_LVT_MASKED)) {
1129                 vector = reg & APIC_VECTOR_MASK;
1130                 mode = reg & APIC_MODE_MASK;
1131                 trig_mode = reg & APIC_LVT_LEVEL_TRIGGER;
1132                 return __apic_accept_irq(apic, mode, vector, 1, trig_mode);
1133         }
1134         return 0;
1135 }
1136
1137 void kvm_apic_nmi_wd_deliver(struct kvm_vcpu *vcpu)
1138 {
1139         struct kvm_lapic *apic = vcpu->arch.apic;
1140
1141         if (apic)
1142                 kvm_apic_local_deliver(apic, APIC_LVT0);
1143 }
1144
1145 static struct kvm_timer_ops lapic_timer_ops = {
1146         .is_periodic = lapic_is_periodic,
1147 };
1148
1149 static const struct kvm_io_device_ops apic_mmio_ops = {
1150         .read     = apic_mmio_read,
1151         .write    = apic_mmio_write,
1152 };
1153
1154 int kvm_create_lapic(struct kvm_vcpu *vcpu)
1155 {
1156         struct kvm_lapic *apic;
1157
1158         ASSERT(vcpu != NULL);
1159         apic_debug("apic_init %d\n", vcpu->vcpu_id);
1160
1161         apic = kzalloc(sizeof(*apic), GFP_KERNEL);
1162         if (!apic)
1163                 goto nomem;
1164
1165         vcpu->arch.apic = apic;
1166
1167         apic->regs = (void *)get_zeroed_page(GFP_KERNEL);
1168         if (!apic->regs) {
1169                 printk(KERN_ERR "malloc apic regs error for vcpu %x\n",
1170                        vcpu->vcpu_id);
1171                 goto nomem_free_apic;
1172         }
1173         apic->vcpu = vcpu;
1174
1175         hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC,
1176                      HRTIMER_MODE_ABS);
1177         apic->lapic_timer.timer.function = kvm_timer_fn;
1178         apic->lapic_timer.t_ops = &lapic_timer_ops;
1179         apic->lapic_timer.kvm = vcpu->kvm;
1180         apic->lapic_timer.vcpu = vcpu;
1181
1182         apic->base_address = APIC_DEFAULT_PHYS_BASE;
1183         vcpu->arch.apic_base = APIC_DEFAULT_PHYS_BASE;
1184
1185         kvm_lapic_reset(vcpu);
1186         kvm_iodevice_init(&apic->dev, &apic_mmio_ops);
1187
1188         return 0;
1189 nomem_free_apic:
1190         kfree(apic);
1191 nomem:
1192         return -ENOMEM;
1193 }
1194
1195 int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
1196 {
1197         struct kvm_lapic *apic = vcpu->arch.apic;
1198         int highest_irr;
1199
1200         if (!apic || !apic_enabled(apic))
1201                 return -1;
1202
1203         apic_update_ppr(apic);
1204         highest_irr = apic_find_highest_irr(apic);
1205         if ((highest_irr == -1) ||
1206             ((highest_irr & 0xF0) <= apic_get_reg(apic, APIC_PROCPRI)))
1207                 return -1;
1208         return highest_irr;
1209 }
1210
1211 int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
1212 {
1213         u32 lvt0 = apic_get_reg(vcpu->arch.apic, APIC_LVT0);
1214         int r = 0;
1215
1216         if (!apic_hw_enabled(vcpu->arch.apic))
1217                 r = 1;
1218         if ((lvt0 & APIC_LVT_MASKED) == 0 &&
1219             GET_APIC_DELIVERY_MODE(lvt0) == APIC_MODE_EXTINT)
1220                 r = 1;
1221         return r;
1222 }
1223
1224 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu)
1225 {
1226         struct kvm_lapic *apic = vcpu->arch.apic;
1227
1228         if (apic && atomic_read(&apic->lapic_timer.pending) > 0) {
1229                 if (kvm_apic_local_deliver(apic, APIC_LVTT))
1230                         atomic_dec(&apic->lapic_timer.pending);
1231         }
1232 }
1233
1234 int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
1235 {
1236         int vector = kvm_apic_has_interrupt(vcpu);
1237         struct kvm_lapic *apic = vcpu->arch.apic;
1238
1239         if (vector == -1)
1240                 return -1;
1241
1242         apic_set_vector(vector, apic->regs + APIC_ISR);
1243         apic_update_ppr(apic);
1244         apic_clear_irr(vector, apic);
1245         return vector;
1246 }
1247
1248 void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu)
1249 {
1250         struct kvm_lapic *apic = vcpu->arch.apic;
1251
1252         apic->base_address = vcpu->arch.apic_base &
1253                              MSR_IA32_APICBASE_BASE;
1254         kvm_apic_set_version(vcpu);
1255
1256         apic_update_ppr(apic);
1257         hrtimer_cancel(&apic->lapic_timer.timer);
1258         update_divide_count(apic);
1259         start_apic_timer(apic);
1260         apic->irr_pending = true;
1261         kvm_make_request(KVM_REQ_EVENT, vcpu);
1262 }
1263
1264 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
1265 {
1266         struct kvm_lapic *apic = vcpu->arch.apic;
1267         struct hrtimer *timer;
1268
1269         if (!apic)
1270                 return;
1271
1272         timer = &apic->lapic_timer.timer;
1273         if (hrtimer_cancel(timer))
1274                 hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
1275 }
1276
1277 void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu)
1278 {
1279         u32 data;
1280         void *vapic;
1281
1282         if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr)
1283                 return;
1284
1285         vapic = kmap_atomic(vcpu->arch.apic->vapic_page, KM_USER0);
1286         data = *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr));
1287         kunmap_atomic(vapic, KM_USER0);
1288
1289         apic_set_tpr(vcpu->arch.apic, data & 0xff);
1290 }
1291
1292 void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu)
1293 {
1294         u32 data, tpr;
1295         int max_irr, max_isr;
1296         struct kvm_lapic *apic;
1297         void *vapic;
1298
1299         if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr)
1300                 return;
1301
1302         apic = vcpu->arch.apic;
1303         tpr = apic_get_reg(apic, APIC_TASKPRI) & 0xff;
1304         max_irr = apic_find_highest_irr(apic);
1305         if (max_irr < 0)
1306                 max_irr = 0;
1307         max_isr = apic_find_highest_isr(apic);
1308         if (max_isr < 0)
1309                 max_isr = 0;
1310         data = (tpr & 0xff) | ((max_isr & 0xf0) << 8) | (max_irr << 24);
1311
1312         vapic = kmap_atomic(vcpu->arch.apic->vapic_page, KM_USER0);
1313         *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr)) = data;
1314         kunmap_atomic(vapic, KM_USER0);
1315 }
1316
1317 void kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr)
1318 {
1319         if (!irqchip_in_kernel(vcpu->kvm))
1320                 return;
1321
1322         vcpu->arch.apic->vapic_addr = vapic_addr;
1323 }
1324
1325 int kvm_x2apic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1326 {
1327         struct kvm_lapic *apic = vcpu->arch.apic;
1328         u32 reg = (msr - APIC_BASE_MSR) << 4;
1329
1330         if (!irqchip_in_kernel(vcpu->kvm) || !apic_x2apic_mode(apic))
1331                 return 1;
1332
1333         /* if this is ICR write vector before command */
1334         if (msr == 0x830)
1335                 apic_reg_write(apic, APIC_ICR2, (u32)(data >> 32));
1336         return apic_reg_write(apic, reg, (u32)data);
1337 }
1338
1339 int kvm_x2apic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
1340 {
1341         struct kvm_lapic *apic = vcpu->arch.apic;
1342         u32 reg = (msr - APIC_BASE_MSR) << 4, low, high = 0;
1343
1344         if (!irqchip_in_kernel(vcpu->kvm) || !apic_x2apic_mode(apic))
1345                 return 1;
1346
1347         if (apic_reg_read(apic, reg, 4, &low))
1348                 return 1;
1349         if (msr == 0x830)
1350                 apic_reg_read(apic, APIC_ICR2, 4, &high);
1351
1352         *data = (((u64)high) << 32) | low;
1353
1354         return 0;
1355 }
1356
1357 int kvm_hv_vapic_msr_write(struct kvm_vcpu *vcpu, u32 reg, u64 data)
1358 {
1359         struct kvm_lapic *apic = vcpu->arch.apic;
1360
1361         if (!irqchip_in_kernel(vcpu->kvm))
1362                 return 1;
1363
1364         /* if this is ICR write vector before command */
1365         if (reg == APIC_ICR)
1366                 apic_reg_write(apic, APIC_ICR2, (u32)(data >> 32));
1367         return apic_reg_write(apic, reg, (u32)data);
1368 }
1369
1370 int kvm_hv_vapic_msr_read(struct kvm_vcpu *vcpu, u32 reg, u64 *data)
1371 {
1372         struct kvm_lapic *apic = vcpu->arch.apic;
1373         u32 low, high = 0;
1374
1375         if (!irqchip_in_kernel(vcpu->kvm))
1376                 return 1;
1377
1378         if (apic_reg_read(apic, reg, 4, &low))
1379                 return 1;
1380         if (reg == APIC_ICR)
1381                 apic_reg_read(apic, APIC_ICR2, 4, &high);
1382
1383         *data = (((u64)high) << 32) | low;
1384
1385         return 0;
1386 }