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  *
   9  * Authors:
  10  *   Dor Laor <dor.laor@qumranet.com>
  11  *   Gregory Haskins <ghaskins@novell.com>
  12  *   Yaozu (Eddie) Dong <eddie.dong@intel.com>
  13  *
  14  * Based on Xen 3.1 code, Copyright (c) 2004, Intel Corporation.
  15  *
  16  * This work is licensed under the terms of the GNU GPL, version 2.  See
  17  * the COPYING file in the top-level directory.
  18  */
  19
  20 #include <linux/kvm_host.h>
  21 #include <linux/kvm.h>
  22 #include <linux/mm.h>
  23 #include <linux/highmem.h>
  24 #include <linux/smp.h>
  25 #include <linux/hrtimer.h>
  26 #include <linux/io.h>
  27 #include <linux/module.h>
  28 #include <linux/math64.h>
  29 #include <asm/processor.h>
  30 #include <asm/msr.h>
  31 #include <asm/page.h>
  32 #include <asm/current.h>
  33 #include <asm/apicdef.h>
  34 #include <asm/atomic.h>
  35 #include "irq.h"
  36
  37 #define PRId64 "d"
  38 #define PRIx64 "llx"
  39 #define PRIu64 "u"
  40 #define PRIo64 "o"
  41
  42 #define APIC_BUS_CYCLE_NS 1
  43
  44 /* #define apic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) */
  45 #define apic_debug(fmt, arg...)
  46
  47 #define APIC_LVT_NUM                    6
  48 /* 14 is the version for Xeon and Pentium 8.4.8*/
  49 #define APIC_VERSION                    (0x14UL | ((APIC_LVT_NUM - 1) << 16))
  50 #define LAPIC_MMIO_LENGTH               (1 << 12)
  51 /* followed define is not in apicdef.h */
  52 #define APIC_SHORT_MASK                 0xc0000
  53 #define APIC_DEST_NOSHORT               0x0
  54 #define APIC_DEST_MASK                  0x800
  55 #define MAX_APIC_VECTOR                 256
  56
  57 #define VEC_POS(v) ((v) & (32 - 1))
  58 #define REG_POS(v) (((v) >> 5) << 4)
  59
  60 static inline u32 apic_get_reg(struct kvm_lapic *apic, int reg_off)
  61 {
  62         return *((u32 *) (apic->regs + reg_off));
  63 }
  64
  65 static inline void apic_set_reg(struct kvm_lapic *apic, int reg_off, u32 val)
  66 {
  67         *((u32 *) (apic->regs + reg_off)) = val;
  68 }
  69
  70 static inline int apic_test_and_set_vector(int vec, void *bitmap)
  71 {
  72         return test_and_set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  73 }
  74
  75 static inline int apic_test_and_clear_vector(int vec, void *bitmap)
  76 {
  77         return test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  78 }
  79
  80 static inline void apic_set_vector(int vec, void *bitmap)
  81 {
  82         set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  83 }
  84
  85 static inline void apic_clear_vector(int vec, void *bitmap)
  86 {
  87         clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  88 }
  89
  90 static inline int apic_hw_enabled(struct kvm_lapic *apic)
  91 {
  92         return (apic)->vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE;
  93 }
  94
  95 static inline int  apic_sw_enabled(struct kvm_lapic *apic)
  96 {
  97         return apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_APIC_ENABLED;
  98 }
  99
 100 static inline int apic_enabled(struct kvm_lapic *apic)
 101 {
 102         return apic_sw_enabled(apic) && apic_hw_enabled(apic);
 103 }
 104
 105 #define LVT_MASK        \
 106         (APIC_LVT_MASKED | APIC_SEND_PENDING | APIC_VECTOR_MASK)
 107
 108 #define LINT_MASK       \
 109         (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
 110          APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
 111
 112 static inline int kvm_apic_id(struct kvm_lapic *apic)
 113 {
 114         return (apic_get_reg(apic, APIC_ID) >> 24) & 0xff;
 115 }
 116
 117 static inline int apic_lvt_enabled(struct kvm_lapic *apic, int lvt_type)
 118 {
 119         return !(apic_get_reg(apic, lvt_type) & APIC_LVT_MASKED);
 120 }
 121
 122 static inline int apic_lvt_vector(struct kvm_lapic *apic, int lvt_type)
 123 {
 124         return apic_get_reg(apic, lvt_type) & APIC_VECTOR_MASK;
 125 }
 126
 127 static inline int apic_lvtt_period(struct kvm_lapic *apic)
 128 {
 129         return apic_get_reg(apic, APIC_LVTT) & APIC_LVT_TIMER_PERIODIC;
 130 }
 131
 132 static unsigned int apic_lvt_mask[APIC_LVT_NUM] = {
 133         LVT_MASK | APIC_LVT_TIMER_PERIODIC,     /* LVTT */
 134         LVT_MASK | APIC_MODE_MASK,      /* LVTTHMR */
 135         LVT_MASK | APIC_MODE_MASK,      /* LVTPC */
 136         LINT_MASK, LINT_MASK,   /* LVT0-1 */
 137         LVT_MASK                /* LVTERR */
 138 };
 139
 140 static int find_highest_vector(void *bitmap)
 141 {
 142         u32 *word = bitmap;
 143         int word_offset = MAX_APIC_VECTOR >> 5;
 144
 145         while ((word_offset != 0) && (word[(--word_offset) << 2] == 0))
 146                 continue;
 147
 148         if (likely(!word_offset && !word[0]))
 149                 return -1;
 150         else
 151                 return fls(word[word_offset << 2]) - 1 + (word_offset << 5);
 152 }
 153
 154 static inline int apic_test_and_set_irr(int vec, struct kvm_lapic *apic)
 155 {
 156         return apic_test_and_set_vector(vec, apic->regs + APIC_IRR);
 157 }
 158
 159 static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
 160 {
 161         apic_clear_vector(vec, apic->regs + APIC_IRR);
 162 }
 163
 164 static inline int apic_find_highest_irr(struct kvm_lapic *apic)
 165 {
 166         int result;
 167
 168         result = find_highest_vector(apic->regs + APIC_IRR);
 169         ASSERT(result == -1 || result >= 16);
 170
 171         return result;
 172 }
 173
 174 int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
 175 {
 176         struct kvm_lapic *apic = vcpu->arch.apic;
 177         int highest_irr;
 178
 179         if (!apic)
 180                 return 0;
 181         highest_irr = apic_find_highest_irr(apic);
 182
 183         return highest_irr;
 184 }
 185 EXPORT_SYMBOL_GPL(kvm_lapic_find_highest_irr);
 186
 187 int kvm_apic_set_irq(struct kvm_vcpu *vcpu, u8 vec, u8 trig)
 188 {
 189         struct kvm_lapic *apic = vcpu->arch.apic;
 190
 191         if (!apic_test_and_set_irr(vec, apic)) {
 192                 /* a new pending irq is set in IRR */
 193                 if (trig)
 194                         apic_set_vector(vec, apic->regs + APIC_TMR);
 195                 else
 196                         apic_clear_vector(vec, apic->regs + APIC_TMR);
 197                 kvm_vcpu_kick(apic->vcpu);
 198                 return 1;
 199         }
 200         return 0;
 201 }
 202
 203 static inline int apic_find_highest_isr(struct kvm_lapic *apic)
 204 {
 205         int result;
 206
 207         result = find_highest_vector(apic->regs + APIC_ISR);
 208         ASSERT(result == -1 || result >= 16);
 209
 210         return result;
 211 }
 212
 213 static void apic_update_ppr(struct kvm_lapic *apic)
 214 {
 215         u32 tpr, isrv, ppr;
 216         int isr;
 217
 218         tpr = apic_get_reg(apic, APIC_TASKPRI);
 219         isr = apic_find_highest_isr(apic);
 220         isrv = (isr != -1) ? isr : 0;
 221
 222         if ((tpr & 0xf0) >= (isrv & 0xf0))
 223                 ppr = tpr & 0xff;
 224         else
 225                 ppr = isrv & 0xf0;
 226
 227         apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x",
 228                    apic, ppr, isr, isrv);
 229
 230         apic_set_reg(apic, APIC_PROCPRI, ppr);
 231 }
 232
 233 static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
 234 {
 235         apic_set_reg(apic, APIC_TASKPRI, tpr);
 236         apic_update_ppr(apic);
 237 }
 238
 239 int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest)
 240 {
 241         return kvm_apic_id(apic) == dest;
 242 }
 243
 244 int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda)
 245 {
 246         int result = 0;
 247         u8 logical_id;
 248
 249         logical_id = GET_APIC_LOGICAL_ID(apic_get_reg(apic, APIC_LDR));
 250
 251         switch (apic_get_reg(apic, APIC_DFR)) {
 252         case APIC_DFR_FLAT:
 253                 if (logical_id & mda)
 254                         result = 1;
 255                 break;
 256         case APIC_DFR_CLUSTER:
 257                 if (((logical_id >> 4) == (mda >> 0x4))
 258                     && (logical_id & mda & 0xf))
 259                         result = 1;
 260                 break;
 261         default:
 262                 printk(KERN_WARNING "Bad DFR vcpu %d: %08x\n",
 263                        apic->vcpu->vcpu_id, apic_get_reg(apic, APIC_DFR));
 264                 break;
 265         }
 266
 267         return result;
 268 }
 269
 270 static int apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
 271                            int short_hand, int dest, int dest_mode)
 272 {
 273         int result = 0;
 274         struct kvm_lapic *target = vcpu->arch.apic;
 275
 276         apic_debug("target %p, source %p, dest 0x%x, "
 277                    "dest_mode 0x%x, short_hand 0x%x",
 278                    target, source, dest, dest_mode, short_hand);
 279
 280         ASSERT(!target);
 281         switch (short_hand) {
 282         case APIC_DEST_NOSHORT:
 283                 if (dest_mode == 0) {
 284                         /* Physical mode. */
 285                         if ((dest == 0xFF) || (dest == kvm_apic_id(target)))
 286                                 result = 1;
 287                 } else
 288                         /* Logical mode. */
 289                         result = kvm_apic_match_logical_addr(target, dest);
 290                 break;
 291         case APIC_DEST_SELF:
 292                 if (target == source)
 293                         result = 1;
 294                 break;
 295         case APIC_DEST_ALLINC:
 296                 result = 1;
 297                 break;
 298         case APIC_DEST_ALLBUT:
 299                 if (target != source)
 300                         result = 1;
 301                 break;
 302         default:
 303                 printk(KERN_WARNING "Bad dest shorthand value %x\n",
 304                        short_hand);
 305                 break;
 306         }
 307
 308         return result;
 309 }
 310
 311 /*
 312  * Add a pending IRQ into lapic.
 313  * Return 1 if successfully added and 0 if discarded.
 314  */
 315 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
 316                              int vector, int level, int trig_mode)
 317 {
 318         int orig_irr, result = 0;
 319         struct kvm_vcpu *vcpu = apic->vcpu;
 320
 321         switch (delivery_mode) {
 322         case APIC_DM_FIXED:
 323         case APIC_DM_LOWEST:
 324                 /* FIXME add logic for vcpu on reset */
 325                 if (unlikely(!apic_enabled(apic)))
 326                         break;
 327
 328                 orig_irr = apic_test_and_set_irr(vector, apic);
 329                 if (orig_irr && trig_mode) {
 330                         apic_debug("level trig mode repeatedly for vector %d",
 331                                    vector);
 332                         break;
 333                 }
 334
 335                 if (trig_mode) {
 336                         apic_debug("level trig mode for vector %d", vector);
 337                         apic_set_vector(vector, apic->regs + APIC_TMR);
 338                 } else
 339                         apic_clear_vector(vector, apic->regs + APIC_TMR);
 340
 341                 if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE)
 342                         kvm_vcpu_kick(vcpu);
 343                 else if (vcpu->arch.mp_state == KVM_MP_STATE_HALTED) {
 344                         vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
 345                         if (waitqueue_active(&vcpu->wq))
 346                                 wake_up_interruptible(&vcpu->wq);
 347                 }
 348
 349                 result = (orig_irr == 0);
 350                 break;
 351
 352         case APIC_DM_REMRD:
 353                 printk(KERN_DEBUG "Ignoring delivery mode 3\n");
 354                 break;
 355
 356         case APIC_DM_SMI:
 357                 printk(KERN_DEBUG "Ignoring guest SMI\n");
 358                 break;
 359
 360         case APIC_DM_NMI:
 361                 kvm_inject_nmi(vcpu);
 362                 break;
 363
 364         case APIC_DM_INIT:
 365                 if (level) {
 366                         if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE)
 367                                 printk(KERN_DEBUG
 368                                        "INIT on a runnable vcpu %d\n",
 369                                        vcpu->vcpu_id);
 370                         vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
 371                         kvm_vcpu_kick(vcpu);
 372                 } else {
 373                         printk(KERN_DEBUG
 374                                "Ignoring de-assert INIT to vcpu %d\n",
 375                                vcpu->vcpu_id);
 376                 }
 377
 378                 break;
 379
 380         case APIC_DM_STARTUP:
 381                 printk(KERN_DEBUG "SIPI to vcpu %d vector 0x%02x\n",
 382                        vcpu->vcpu_id, vector);
 383                 if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
 384                         vcpu->arch.sipi_vector = vector;
 385                         vcpu->arch.mp_state = KVM_MP_STATE_SIPI_RECEIVED;
 386                         if (waitqueue_active(&vcpu->wq))
 387                                 wake_up_interruptible(&vcpu->wq);
 388                 }
 389                 break;
 390
 391         default:
 392                 printk(KERN_ERR "TODO: unsupported delivery mode %x\n",
 393                        delivery_mode);
 394                 break;
 395         }
 396         return result;
 397 }
 398
 399 static struct kvm_lapic *kvm_apic_round_robin(struct kvm *kvm, u8 vector,
 400                                        unsigned long bitmap)
 401 {
 402         int last;
 403         int next;
 404         struct kvm_lapic *apic = NULL;
 405
 406         last = kvm->arch.round_robin_prev_vcpu;
 407         next = last;
 408
 409         do {
 410                 if (++next == KVM_MAX_VCPUS)
 411                         next = 0;
 412                 if (kvm->vcpus[next] == NULL || !test_bit(next, &bitmap))
 413                         continue;
 414                 apic = kvm->vcpus[next]->arch.apic;
 415                 if (apic && apic_enabled(apic))
 416                         break;
 417                 apic = NULL;
 418         } while (next != last);
 419         kvm->arch.round_robin_prev_vcpu = next;
 420
 421         if (!apic)
 422                 printk(KERN_DEBUG "vcpu not ready for apic_round_robin\n");
 423
 424         return apic;
 425 }
 426
 427 struct kvm_vcpu *kvm_get_lowest_prio_vcpu(struct kvm *kvm, u8 vector,
 428                 unsigned long bitmap)
 429 {
 430         struct kvm_lapic *apic;
 431
 432         apic = kvm_apic_round_robin(kvm, vector, bitmap);
 433         if (apic)
 434                 return apic->vcpu;
 435         return NULL;
 436 }
 437
 438 static void apic_set_eoi(struct kvm_lapic *apic)
 439 {
 440         int vector = apic_find_highest_isr(apic);
 441
 442         /*
 443          * Not every write EOI will has corresponding ISR,
 444          * one example is when Kernel check timer on setup_IO_APIC
 445          */
 446         if (vector == -1)
 447                 return;
 448
 449         apic_clear_vector(vector, apic->regs + APIC_ISR);
 450         apic_update_ppr(apic);
 451
 452         if (apic_test_and_clear_vector(vector, apic->regs + APIC_TMR))
 453                 kvm_ioapic_update_eoi(apic->vcpu->kvm, vector);
 454 }
 455
 456 static void apic_send_ipi(struct kvm_lapic *apic)
 457 {
 458         u32 icr_low = apic_get_reg(apic, APIC_ICR);
 459         u32 icr_high = apic_get_reg(apic, APIC_ICR2);
 460
 461         unsigned int dest = GET_APIC_DEST_FIELD(icr_high);
 462         unsigned int short_hand = icr_low & APIC_SHORT_MASK;
 463         unsigned int trig_mode = icr_low & APIC_INT_LEVELTRIG;
 464         unsigned int level = icr_low & APIC_INT_ASSERT;
 465         unsigned int dest_mode = icr_low & APIC_DEST_MASK;
 466         unsigned int delivery_mode = icr_low & APIC_MODE_MASK;
 467         unsigned int vector = icr_low & APIC_VECTOR_MASK;
 468
 469         struct kvm_vcpu *target;
 470         struct kvm_vcpu *vcpu;
 471         unsigned long lpr_map = 0;
 472         int i;
 473
 474         apic_debug("icr_high 0x%x, icr_low 0x%x, "
 475                    "short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
 476                    "dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x\n",
 477                    icr_high, icr_low, short_hand, dest,
 478                    trig_mode, level, dest_mode, delivery_mode, vector);
 479
 480         for (i = 0; i < KVM_MAX_VCPUS; i++) {
 481                 vcpu = apic->vcpu->kvm->vcpus[i];
 482                 if (!vcpu)
 483                         continue;
 484
 485                 if (vcpu->arch.apic &&
 486                     apic_match_dest(vcpu, apic, short_hand, dest, dest_mode)) {
 487                         if (delivery_mode == APIC_DM_LOWEST)
 488                                 set_bit(vcpu->vcpu_id, &lpr_map);
 489                         else
 490                                 __apic_accept_irq(vcpu->arch.apic, delivery_mode,
 491                                                   vector, level, trig_mode);
 492                 }
 493         }
 494
 495         if (delivery_mode == APIC_DM_LOWEST) {
 496                 target = kvm_get_lowest_prio_vcpu(vcpu->kvm, vector, lpr_map);
 497                 if (target != NULL)
 498                         __apic_accept_irq(target->arch.apic, delivery_mode,
 499                                           vector, level, trig_mode);
 500         }
 501 }
 502
 503 static u32 apic_get_tmcct(struct kvm_lapic *apic)
 504 {
 505         u64 counter_passed;
 506         ktime_t passed, now;
 507         u32 tmcct;
 508
 509         ASSERT(apic != NULL);
 510
 511         now = apic->timer.dev.base->get_time();
 512         tmcct = apic_get_reg(apic, APIC_TMICT);
 513
 514         /* if initial count is 0, current count should also be 0 */
 515         if (tmcct == 0)
 516                 return 0;
 517
 518         if (unlikely(ktime_to_ns(now) <=
 519                 ktime_to_ns(apic->timer.last_update))) {
 520                 /* Wrap around */
 521                 passed = ktime_add(( {
 522                                     (ktime_t) {
 523                                     .tv64 = KTIME_MAX -
 524                                     (apic->timer.last_update).tv64}; }
 525                                    ), now);
 526                 apic_debug("time elapsed\n");
 527         } else
 528                 passed = ktime_sub(now, apic->timer.last_update);
 529
 530         counter_passed = div64_u64(ktime_to_ns(passed),
 531                                    (APIC_BUS_CYCLE_NS * apic->timer.divide_count));
 532
 533         if (counter_passed > tmcct) {
 534                 if (unlikely(!apic_lvtt_period(apic))) {
 535                         /* one-shot timers stick at 0 until reset */
 536                         tmcct = 0;
 537                 } else {
 538                         /*
 539                          * periodic timers reset to APIC_TMICT when they
 540                          * hit 0. The while loop simulates this happening N
 541                          * times. (counter_passed %= tmcct) would also work,
 542                          * but might be slower or not work on 32-bit??
 543                          */
 544                         while (counter_passed > tmcct)
 545                                 counter_passed -= tmcct;
 546                         tmcct -= counter_passed;
 547                 }
 548         } else {
 549                 tmcct -= counter_passed;
 550         }
 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         set_bit(KVM_REQ_REPORT_TPR_ACCESS, &vcpu->requests);
 561         kvm_x86_ops->cache_regs(vcpu);
 562         run->tpr_access.rip = vcpu->arch.rip;
 563         run->tpr_access.is_write = write;
 564 }
 565
 566 static inline void report_tpr_access(struct kvm_lapic *apic, bool write)
 567 {
 568         if (apic->vcpu->arch.tpr_access_reporting)
 569                 __report_tpr_access(apic, write);
 570 }
 571
 572 static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset)
 573 {
 574         u32 val = 0;
 575
 576         KVMTRACE_1D(APIC_ACCESS, apic->vcpu, (u32)offset, handler);
 577
 578         if (offset >= LAPIC_MMIO_LENGTH)
 579                 return 0;
 580
 581         switch (offset) {
 582         case APIC_ARBPRI:
 583                 printk(KERN_WARNING "Access APIC ARBPRI register "
 584                        "which is for P6\n");
 585                 break;
 586
 587         case APIC_TMCCT:        /* Timer CCR */
 588                 val = apic_get_tmcct(apic);
 589                 break;
 590
 591         case APIC_TASKPRI:
 592                 report_tpr_access(apic, false);
 593                 /* fall thru */
 594         default:
 595                 apic_update_ppr(apic);
 596                 val = apic_get_reg(apic, offset);
 597                 break;
 598         }
 599
 600         return val;
 601 }
 602
 603 static void apic_mmio_read(struct kvm_io_device *this,
 604                            gpa_t address, int len, void *data)
 605 {
 606         struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
 607         unsigned int offset = address - apic->base_address;
 608         unsigned char alignment = offset & 0xf;
 609         u32 result;
 610
 611         if ((alignment + len) > 4) {
 612                 printk(KERN_ERR "KVM_APIC_READ: alignment error %lx %d",
 613                        (unsigned long)address, len);
 614                 return;
 615         }
 616         result = __apic_read(apic, offset & ~0xf);
 617
 618         switch (len) {
 619         case 1:
 620         case 2:
 621         case 4:
 622                 memcpy(data, (char *)&result + alignment, len);
 623                 break;
 624         default:
 625                 printk(KERN_ERR "Local APIC read with len = %x, "
 626                        "should be 1,2, or 4 instead\n", len);
 627                 break;
 628         }
 629 }
 630
 631 static void update_divide_count(struct kvm_lapic *apic)
 632 {
 633         u32 tmp1, tmp2, tdcr;
 634
 635         tdcr = apic_get_reg(apic, APIC_TDCR);
 636         tmp1 = tdcr & 0xf;
 637         tmp2 = ((tmp1 & 0x3) | ((tmp1 & 0x8) >> 1)) + 1;
 638         apic->timer.divide_count = 0x1 << (tmp2 & 0x7);
 639
 640         apic_debug("timer divide count is 0x%x\n",
 641                                    apic->timer.divide_count);
 642 }
 643
 644 static void start_apic_timer(struct kvm_lapic *apic)
 645 {
 646         ktime_t now = apic->timer.dev.base->get_time();
 647
 648         apic->timer.last_update = now;
 649
 650         apic->timer.period = apic_get_reg(apic, APIC_TMICT) *
 651                     APIC_BUS_CYCLE_NS * apic->timer.divide_count;
 652         atomic_set(&apic->timer.pending, 0);
 653
 654         if (!apic->timer.period)
 655                 return;
 656
 657         hrtimer_start(&apic->timer.dev,
 658                       ktime_add_ns(now, apic->timer.period),
 659                       HRTIMER_MODE_ABS);
 660
 661         apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016"
 662                            PRIx64 ", "
 663                            "timer initial count 0x%x, period %lldns, "
 664                            "expire @ 0x%016" PRIx64 ".\n", __func__,
 665                            APIC_BUS_CYCLE_NS, ktime_to_ns(now),
 666                            apic_get_reg(apic, APIC_TMICT),
 667                            apic->timer.period,
 668                            ktime_to_ns(ktime_add_ns(now,
 669                                         apic->timer.period)));
 670 }
 671
 672 static void apic_mmio_write(struct kvm_io_device *this,
 673                             gpa_t address, int len, const void *data)
 674 {
 675         struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
 676         unsigned int offset = address - apic->base_address;
 677         unsigned char alignment = offset & 0xf;
 678         u32 val;
 679
 680         /*
 681          * APIC register must be aligned on 128-bits boundary.
 682          * 32/64/128 bits registers must be accessed thru 32 bits.
 683          * Refer SDM 8.4.1
 684          */
 685         if (len != 4 || alignment) {
 686                 if (printk_ratelimit())
 687                         printk(KERN_ERR "apic write: bad size=%d %lx\n",
 688                                len, (long)address);
 689                 return;
 690         }
 691
 692         val = *(u32 *) data;
 693
 694         /* too common printing */
 695         if (offset != APIC_EOI)
 696                 apic_debug("%s: offset 0x%x with length 0x%x, and value is "
 697                            "0x%x\n", __func__, offset, len, val);
 698
 699         offset &= 0xff0;
 700
 701         KVMTRACE_1D(APIC_ACCESS, apic->vcpu, (u32)offset, handler);
 702
 703         switch (offset) {
 704         case APIC_ID:           /* Local APIC ID */
 705                 apic_set_reg(apic, APIC_ID, val);
 706                 break;
 707
 708         case APIC_TASKPRI:
 709                 report_tpr_access(apic, true);
 710                 apic_set_tpr(apic, val & 0xff);
 711                 break;
 712
 713         case APIC_EOI:
 714                 apic_set_eoi(apic);
 715                 break;
 716
 717         case APIC_LDR:
 718                 apic_set_reg(apic, APIC_LDR, val & APIC_LDR_MASK);
 719                 break;
 720
 721         case APIC_DFR:
 722                 apic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
 723                 break;
 724
 725         case APIC_SPIV:
 726                 apic_set_reg(apic, APIC_SPIV, val & 0x3ff);
 727                 if (!(val & APIC_SPIV_APIC_ENABLED)) {
 728                         int i;
 729                         u32 lvt_val;
 730
 731                         for (i = 0; i < APIC_LVT_NUM; i++) {
 732                                 lvt_val = apic_get_reg(apic,
 733                                                        APIC_LVTT + 0x10 * i);
 734                                 apic_set_reg(apic, APIC_LVTT + 0x10 * i,
 735                                              lvt_val | APIC_LVT_MASKED);
 736                         }
 737                         atomic_set(&apic->timer.pending, 0);
 738
 739                 }
 740                 break;
 741
 742         case APIC_ICR:
 743                 /* No delay here, so we always clear the pending bit */
 744                 apic_set_reg(apic, APIC_ICR, val & ~(1 << 12));
 745                 apic_send_ipi(apic);
 746                 break;
 747
 748         case APIC_ICR2:
 749                 apic_set_reg(apic, APIC_ICR2, val & 0xff000000);
 750                 break;
 751
 752         case APIC_LVTT:
 753         case APIC_LVTTHMR:
 754         case APIC_LVTPC:
 755         case APIC_LVT0:
 756         case APIC_LVT1:
 757         case APIC_LVTERR:
 758                 /* TODO: Check vector */
 759                 if (!apic_sw_enabled(apic))
 760                         val |= APIC_LVT_MASKED;
 761
 762                 val &= apic_lvt_mask[(offset - APIC_LVTT) >> 4];
 763                 apic_set_reg(apic, offset, val);
 764
 765                 break;
 766
 767         case APIC_TMICT:
 768                 hrtimer_cancel(&apic->timer.dev);
 769                 apic_set_reg(apic, APIC_TMICT, val);
 770                 start_apic_timer(apic);
 771                 return;
 772
 773         case APIC_TDCR:
 774                 if (val & 4)
 775                         printk(KERN_ERR "KVM_WRITE:TDCR %x\n", val);
 776                 apic_set_reg(apic, APIC_TDCR, val);
 777                 update_divide_count(apic);
 778                 break;
 779
 780         default:
 781                 apic_debug("Local APIC Write to read-only register %x\n",
 782                            offset);
 783                 break;
 784         }
 785
 786 }
 787
 788 static int apic_mmio_range(struct kvm_io_device *this, gpa_t addr,
 789                            int len, int size)
 790 {
 791         struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
 792         int ret = 0;
 793
 794
 795         if (apic_hw_enabled(apic) &&
 796             (addr >= apic->base_address) &&
 797             (addr < (apic->base_address + LAPIC_MMIO_LENGTH)))
 798                 ret = 1;
 799
 800         return ret;
 801 }
 802
 803 void kvm_free_lapic(struct kvm_vcpu *vcpu)
 804 {
 805         if (!vcpu->arch.apic)
 806                 return;
 807
 808         hrtimer_cancel(&vcpu->arch.apic->timer.dev);
 809
 810         if (vcpu->arch.apic->regs_page)
 811                 __free_page(vcpu->arch.apic->regs_page);
 812
 813         kfree(vcpu->arch.apic);
 814 }
 815
 816 /*
 817  *----------------------------------------------------------------------
 818  * LAPIC interface
 819  *----------------------------------------------------------------------
 820  */
 821
 822 void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8)
 823 {
 824         struct kvm_lapic *apic = vcpu->arch.apic;
 825
 826         if (!apic)
 827                 return;
 828         apic_set_tpr(apic, ((cr8 & 0x0f) << 4)
 829                      | (apic_get_reg(apic, APIC_TASKPRI) & 4));
 830 }
 831 EXPORT_SYMBOL_GPL(kvm_lapic_set_tpr);
 832
 833 u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
 834 {
 835         struct kvm_lapic *apic = vcpu->arch.apic;
 836         u64 tpr;
 837
 838         if (!apic)
 839                 return 0;
 840         tpr = (u64) apic_get_reg(apic, APIC_TASKPRI);
 841
 842         return (tpr & 0xf0) >> 4;
 843 }
 844 EXPORT_SYMBOL_GPL(kvm_lapic_get_cr8);
 845
 846 void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
 847 {
 848         struct kvm_lapic *apic = vcpu->arch.apic;
 849
 850         if (!apic) {
 851                 value |= MSR_IA32_APICBASE_BSP;
 852                 vcpu->arch.apic_base = value;
 853                 return;
 854         }
 855         if (apic->vcpu->vcpu_id)
 856                 value &= ~MSR_IA32_APICBASE_BSP;
 857
 858         vcpu->arch.apic_base = value;
 859         apic->base_address = apic->vcpu->arch.apic_base &
 860                              MSR_IA32_APICBASE_BASE;
 861
 862         /* with FSB delivery interrupt, we can restart APIC functionality */
 863         apic_debug("apic base msr is 0x%016" PRIx64 ", and base address is "
 864                    "0x%lx.\n", apic->vcpu->arch.apic_base, apic->base_address);
 865
 866 }
 867
 868 u64 kvm_lapic_get_base(struct kvm_vcpu *vcpu)
 869 {
 870         return vcpu->arch.apic_base;
 871 }
 872 EXPORT_SYMBOL_GPL(kvm_lapic_get_base);
 873
 874 void kvm_lapic_reset(struct kvm_vcpu *vcpu)
 875 {
 876         struct kvm_lapic *apic;
 877         int i;
 878
 879         apic_debug("%s\n", __func__);
 880
 881         ASSERT(vcpu);
 882         apic = vcpu->arch.apic;
 883         ASSERT(apic != NULL);
 884
 885         /* Stop the timer in case it's a reset to an active apic */
 886         hrtimer_cancel(&apic->timer.dev);
 887
 888         apic_set_reg(apic, APIC_ID, vcpu->vcpu_id << 24);
 889         apic_set_reg(apic, APIC_LVR, APIC_VERSION);
 890
 891         for (i = 0; i < APIC_LVT_NUM; i++)
 892                 apic_set_reg(apic, APIC_LVTT + 0x10 * i, APIC_LVT_MASKED);
 893         apic_set_reg(apic, APIC_LVT0,
 894                      SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT));
 895
 896         apic_set_reg(apic, APIC_DFR, 0xffffffffU);
 897         apic_set_reg(apic, APIC_SPIV, 0xff);
 898         apic_set_reg(apic, APIC_TASKPRI, 0);
 899         apic_set_reg(apic, APIC_LDR, 0);
 900         apic_set_reg(apic, APIC_ESR, 0);
 901         apic_set_reg(apic, APIC_ICR, 0);
 902         apic_set_reg(apic, APIC_ICR2, 0);
 903         apic_set_reg(apic, APIC_TDCR, 0);
 904         apic_set_reg(apic, APIC_TMICT, 0);
 905         for (i = 0; i < 8; i++) {
 906                 apic_set_reg(apic, APIC_IRR + 0x10 * i, 0);
 907                 apic_set_reg(apic, APIC_ISR + 0x10 * i, 0);
 908                 apic_set_reg(apic, APIC_TMR + 0x10 * i, 0);
 909         }
 910         update_divide_count(apic);
 911         atomic_set(&apic->timer.pending, 0);
 912         if (vcpu->vcpu_id == 0)
 913                 vcpu->arch.apic_base |= MSR_IA32_APICBASE_BSP;
 914         apic_update_ppr(apic);
 915
 916         apic_debug(KERN_INFO "%s: vcpu=%p, id=%d, base_msr="
 917                    "0x%016" PRIx64 ", base_address=0x%0lx.\n", __func__,
 918                    vcpu, kvm_apic_id(apic),
 919                    vcpu->arch.apic_base, apic->base_address);
 920 }
 921 EXPORT_SYMBOL_GPL(kvm_lapic_reset);
 922
 923 int kvm_lapic_enabled(struct kvm_vcpu *vcpu)
 924 {
 925         struct kvm_lapic *apic = vcpu->arch.apic;
 926         int ret = 0;
 927
 928         if (!apic)
 929                 return 0;
 930         ret = apic_enabled(apic);
 931
 932         return ret;
 933 }
 934 EXPORT_SYMBOL_GPL(kvm_lapic_enabled);
 935
 936 /*
 937  *----------------------------------------------------------------------
 938  * timer interface
 939  *----------------------------------------------------------------------
 940  */
 941
 942 /* TODO: make sure __apic_timer_fn runs in current pCPU */
 943 static int __apic_timer_fn(struct kvm_lapic *apic)
 944 {
 945         int result = 0;
 946         wait_queue_head_t *q = &apic->vcpu->wq;
 947
 948         if(!atomic_inc_and_test(&apic->timer.pending))
 949                 set_bit(KVM_REQ_PENDING_TIMER, &apic->vcpu->requests);
 950         if (waitqueue_active(q)) {
 951                 apic->vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
 952                 wake_up_interruptible(q);
 953         }
 954         if (apic_lvtt_period(apic)) {
 955                 result = 1;
 956                 hrtimer_add_expires_ns(&apic->timer.dev, apic->timer.period);
 957         }
 958         return result;
 959 }
 960
 961 int apic_has_pending_timer(struct kvm_vcpu *vcpu)
 962 {
 963         struct kvm_lapic *lapic = vcpu->arch.apic;
 964
 965         if (lapic && apic_enabled(lapic) && apic_lvt_enabled(lapic, APIC_LVTT))
 966                 return atomic_read(&lapic->timer.pending);
 967
 968         return 0;
 969 }
 970
 971 static int __inject_apic_timer_irq(struct kvm_lapic *apic)
 972 {
 973         int vector;
 974
 975         vector = apic_lvt_vector(apic, APIC_LVTT);
 976         return __apic_accept_irq(apic, APIC_DM_FIXED, vector, 1, 0);
 977 }
 978
 979 static enum hrtimer_restart apic_timer_fn(struct hrtimer *data)
 980 {
 981         struct kvm_lapic *apic;
 982         int restart_timer = 0;
 983
 984         apic = container_of(data, struct kvm_lapic, timer.dev);
 985
 986         restart_timer = __apic_timer_fn(apic);
 987
 988         if (restart_timer)
 989                 return HRTIMER_RESTART;
 990         else
 991                 return HRTIMER_NORESTART;
 992 }
 993
 994 int kvm_create_lapic(struct kvm_vcpu *vcpu)
 995 {
 996         struct kvm_lapic *apic;
 997
 998         ASSERT(vcpu != NULL);
 999         apic_debug("apic_init %d\n", vcpu->vcpu_id);
1000
1001         apic = kzalloc(sizeof(*apic), GFP_KERNEL);
1002         if (!apic)
1003                 goto nomem;
1004
1005         vcpu->arch.apic = apic;
1006
1007         apic->regs_page = alloc_page(GFP_KERNEL);
1008         if (apic->regs_page == NULL) {
1009                 printk(KERN_ERR "malloc apic regs error for vcpu %x\n",
1010                        vcpu->vcpu_id);
1011                 goto nomem_free_apic;
1012         }
1013         apic->regs = page_address(apic->regs_page);
1014         memset(apic->regs, 0, PAGE_SIZE);
1015         apic->vcpu = vcpu;
1016
1017         hrtimer_init(&apic->timer.dev, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
1018         apic->timer.dev.function = apic_timer_fn;
1019         apic->base_address = APIC_DEFAULT_PHYS_BASE;
1020         vcpu->arch.apic_base = APIC_DEFAULT_PHYS_BASE;
1021
1022         kvm_lapic_reset(vcpu);
1023         apic->dev.read = apic_mmio_read;
1024         apic->dev.write = apic_mmio_write;
1025         apic->dev.in_range = apic_mmio_range;
1026         apic->dev.private = apic;
1027
1028         return 0;
1029 nomem_free_apic:
1030         kfree(apic);
1031 nomem:
1032         return -ENOMEM;
1033 }
1034 EXPORT_SYMBOL_GPL(kvm_create_lapic);
1035
1036 int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
1037 {
1038         struct kvm_lapic *apic = vcpu->arch.apic;
1039         int highest_irr;
1040
1041         if (!apic || !apic_enabled(apic))
1042                 return -1;
1043
1044         apic_update_ppr(apic);
1045         highest_irr = apic_find_highest_irr(apic);
1046         if ((highest_irr == -1) ||
1047             ((highest_irr & 0xF0) <= apic_get_reg(apic, APIC_PROCPRI)))
1048                 return -1;
1049         return highest_irr;
1050 }
1051
1052 int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
1053 {
1054         u32 lvt0 = apic_get_reg(vcpu->arch.apic, APIC_LVT0);
1055         int r = 0;
1056
1057         if (vcpu->vcpu_id == 0) {
1058                 if (!apic_hw_enabled(vcpu->arch.apic))
1059                         r = 1;
1060                 if ((lvt0 & APIC_LVT_MASKED) == 0 &&
1061                     GET_APIC_DELIVERY_MODE(lvt0) == APIC_MODE_EXTINT)
1062                         r = 1;
1063         }
1064         return r;
1065 }
1066
1067 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu)
1068 {
1069         struct kvm_lapic *apic = vcpu->arch.apic;
1070
1071         if (apic && apic_lvt_enabled(apic, APIC_LVTT) &&
1072                 atomic_read(&apic->timer.pending) > 0) {
1073                 if (__inject_apic_timer_irq(apic))
1074                         atomic_dec(&apic->timer.pending);
1075         }
1076 }
1077
1078 void kvm_apic_timer_intr_post(struct kvm_vcpu *vcpu, int vec)
1079 {
1080         struct kvm_lapic *apic = vcpu->arch.apic;
1081
1082         if (apic && apic_lvt_vector(apic, APIC_LVTT) == vec)
1083                 apic->timer.last_update = ktime_add_ns(
1084                                 apic->timer.last_update,
1085                                 apic->timer.period);
1086 }
1087
1088 int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
1089 {
1090         int vector = kvm_apic_has_interrupt(vcpu);
1091         struct kvm_lapic *apic = vcpu->arch.apic;
1092
1093         if (vector == -1)
1094                 return -1;
1095
1096         apic_set_vector(vector, apic->regs + APIC_ISR);
1097         apic_update_ppr(apic);
1098         apic_clear_irr(vector, apic);
1099         return vector;
1100 }
1101
1102 void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu)
1103 {
1104         struct kvm_lapic *apic = vcpu->arch.apic;
1105
1106         apic->base_address = vcpu->arch.apic_base &
1107                              MSR_IA32_APICBASE_BASE;
1108         apic_set_reg(apic, APIC_LVR, APIC_VERSION);
1109         apic_update_ppr(apic);
1110         hrtimer_cancel(&apic->timer.dev);
1111         update_divide_count(apic);
1112         start_apic_timer(apic);
1113 }
1114
1115 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
1116 {
1117         struct kvm_lapic *apic = vcpu->arch.apic;
1118         struct hrtimer *timer;
1119
1120         if (!apic)
1121                 return;
1122
1123         timer = &apic->timer.dev;
1124         if (hrtimer_cancel(timer))
1125                 hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
1126 }
1127
1128 void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu)
1129 {
1130         u32 data;
1131         void *vapic;
1132
1133         if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr)
1134                 return;
1135
1136         vapic = kmap_atomic(vcpu->arch.apic->vapic_page, KM_USER0);
1137         data = *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr));
1138         kunmap_atomic(vapic, KM_USER0);
1139
1140         apic_set_tpr(vcpu->arch.apic, data & 0xff);
1141 }
1142
1143 void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu)
1144 {
1145         u32 data, tpr;
1146         int max_irr, max_isr;
1147         struct kvm_lapic *apic;
1148         void *vapic;
1149
1150         if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr)
1151                 return;
1152
1153         apic = vcpu->arch.apic;
1154         tpr = apic_get_reg(apic, APIC_TASKPRI) & 0xff;
1155         max_irr = apic_find_highest_irr(apic);
1156         if (max_irr < 0)
1157                 max_irr = 0;
1158         max_isr = apic_find_highest_isr(apic);
1159         if (max_isr < 0)
1160                 max_isr = 0;
1161         data = (tpr & 0xff) | ((max_isr & 0xf0) << 8) | (max_irr << 24);
1162
1163         vapic = kmap_atomic(vcpu->arch.apic->vapic_page, KM_USER0);
1164         *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr)) = data;
1165         kunmap_atomic(vapic, KM_USER0);
1166 }
1167
1168 void kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr)
1169 {
1170         if (!irqchip_in_kernel(vcpu->kvm))
1171                 return;
1172
1173         vcpu->arch.apic->vapic_addr = vapic_addr;
1174 }