git.oblomov.eu Git - linux-2.6/blob - 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 "kvm_cache_regs.h"
  36 #include "irq.h"
  37
  38 #define PRId64 "d"
  39 #define PRIx64 "llx"
  40 #define PRIu64 "u"
  41 #define PRIo64 "o"
  42
  43 #define APIC_BUS_CYCLE_NS 1
  44
  45 /* #define apic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) */
  46 #define apic_debug(fmt, arg...)
  47
  48 #define APIC_LVT_NUM                    6
  49 /* 14 is the version for Xeon and Pentium 8.4.8*/
  50 #define APIC_VERSION                    (0x14UL | ((APIC_LVT_NUM - 1) << 16))
  51 #define LAPIC_MMIO_LENGTH               (1 << 12)
  52 /* followed define is not in apicdef.h */
  53 #define APIC_SHORT_MASK                 0xc0000
  54 #define APIC_DEST_NOSHORT               0x0
  55 #define APIC_DEST_MASK                  0x800
  56 #define MAX_APIC_VECTOR                 256
  57
  58 #define VEC_POS(v) ((v) & (32 - 1))
  59 #define REG_POS(v) (((v) >> 5) << 4)
  60
  61 static inline u32 apic_get_reg(struct kvm_lapic *apic, int reg_off)
  62 {
  63         return *((u32 *) (apic->regs + reg_off));
  64 }
  65
  66 static inline void apic_set_reg(struct kvm_lapic *apic, int reg_off, u32 val)
  67 {
  68         *((u32 *) (apic->regs + reg_off)) = val;
  69 }
  70
  71 static inline int apic_test_and_set_vector(int vec, void *bitmap)
  72 {
  73         return test_and_set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  74 }
  75
  76 static inline int apic_test_and_clear_vector(int vec, void *bitmap)
  77 {
  78         return test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  79 }
  80
  81 static inline void apic_set_vector(int vec, void *bitmap)
  82 {
  83         set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  84 }
  85
  86 static inline void apic_clear_vector(int vec, void *bitmap)
  87 {
  88         clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
  89 }
  90
  91 static inline int apic_hw_enabled(struct kvm_lapic *apic)
  92 {
  93         return (apic)->vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE;
  94 }
  95
  96 static inline int  apic_sw_enabled(struct kvm_lapic *apic)
  97 {
  98         return apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_APIC_ENABLED;
  99 }
 100
 101 static inline int apic_enabled(struct kvm_lapic *apic)
 102 {
 103         return apic_sw_enabled(apic) && apic_hw_enabled(apic);
 104 }
 105
 106 #define LVT_MASK        \
 107         (APIC_LVT_MASKED | APIC_SEND_PENDING | APIC_VECTOR_MASK)
 108
 109 #define LINT_MASK       \
 110         (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
 111          APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
 112
 113 static inline int kvm_apic_id(struct kvm_lapic *apic)
 114 {
 115         return (apic_get_reg(apic, APIC_ID) >> 24) & 0xff;
 116 }
 117
 118 static inline int apic_lvt_enabled(struct kvm_lapic *apic, int lvt_type)
 119 {
 120         return !(apic_get_reg(apic, lvt_type) & APIC_LVT_MASKED);
 121 }
 122
 123 static inline int apic_lvt_vector(struct kvm_lapic *apic, int lvt_type)
 124 {
 125         return apic_get_reg(apic, lvt_type) & APIC_VECTOR_MASK;
 126 }
 127
 128 static inline int apic_lvtt_period(struct kvm_lapic *apic)
 129 {
 130         return apic_get_reg(apic, APIC_LVTT) & APIC_LVT_TIMER_PERIODIC;
 131 }
 132
 133 static unsigned int apic_lvt_mask[APIC_LVT_NUM] = {
 134         LVT_MASK | APIC_LVT_TIMER_PERIODIC,     /* LVTT */
 135         LVT_MASK | APIC_MODE_MASK,      /* LVTTHMR */
 136         LVT_MASK | APIC_MODE_MASK,      /* LVTPC */
 137         LINT_MASK, LINT_MASK,   /* LVT0-1 */
 138         LVT_MASK                /* LVTERR */
 139 };
 140
 141 static int find_highest_vector(void *bitmap)
 142 {
 143         u32 *word = bitmap;
 144         int word_offset = MAX_APIC_VECTOR >> 5;
 145
 146         while ((word_offset != 0) && (word[(--word_offset) << 2] == 0))
 147                 continue;
 148
 149         if (likely(!word_offset && !word[0]))
 150                 return -1;
 151         else
 152                 return fls(word[word_offset << 2]) - 1 + (word_offset << 5);
 153 }
 154
 155 static inline int apic_test_and_set_irr(int vec, struct kvm_lapic *apic)
 156 {
 157         return apic_test_and_set_vector(vec, apic->regs + APIC_IRR);
 158 }
 159
 160 static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
 161 {
 162         apic_clear_vector(vec, apic->regs + APIC_IRR);
 163 }
 164
 165 static inline int apic_find_highest_irr(struct kvm_lapic *apic)
 166 {
 167         int result;
 168
 169         result = find_highest_vector(apic->regs + APIC_IRR);
 170         ASSERT(result == -1 || result >= 16);
 171
 172         return result;
 173 }
 174
 175 int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
 176 {
 177         struct kvm_lapic *apic = vcpu->arch.apic;
 178         int highest_irr;
 179
 180         if (!apic)
 181                 return 0;
 182         highest_irr = apic_find_highest_irr(apic);
 183
 184         return highest_irr;
 185 }
 186 EXPORT_SYMBOL_GPL(kvm_lapic_find_highest_irr);
 187
 188 int kvm_apic_set_irq(struct kvm_vcpu *vcpu, u8 vec, u8 trig)
 189 {
 190         struct kvm_lapic *apic = vcpu->arch.apic;
 191
 192         if (!apic_test_and_set_irr(vec, apic)) {
 193                 /* a new pending irq is set in IRR */
 194                 if (trig)
 195                         apic_set_vector(vec, apic->regs + APIC_TMR);
 196                 else
 197                         apic_clear_vector(vec, apic->regs + APIC_TMR);
 198                 kvm_vcpu_kick(apic->vcpu);
 199                 return 1;
 200         }
 201         return 0;
 202 }
 203
 204 static inline int apic_find_highest_isr(struct kvm_lapic *apic)
 205 {
 206         int result;
 207
 208         result = find_highest_vector(apic->regs + APIC_ISR);
 209         ASSERT(result == -1 || result >= 16);
 210
 211         return result;
 212 }
 213
 214 static void apic_update_ppr(struct kvm_lapic *apic)
 215 {
 216         u32 tpr, isrv, ppr;
 217         int isr;
 218
 219         tpr = apic_get_reg(apic, APIC_TASKPRI);
 220         isr = apic_find_highest_isr(apic);
 221         isrv = (isr != -1) ? isr : 0;
 222
 223         if ((tpr & 0xf0) >= (isrv & 0xf0))
 224                 ppr = tpr & 0xff;
 225         else
 226                 ppr = isrv & 0xf0;
 227
 228         apic_debug("vlapic %p, ppr 0x%x, isr 0x%x, isrv 0x%x",
 229                    apic, ppr, isr, isrv);
 230
 231         apic_set_reg(apic, APIC_PROCPRI, ppr);
 232 }
 233
 234 static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
 235 {
 236         apic_set_reg(apic, APIC_TASKPRI, tpr);
 237         apic_update_ppr(apic);
 238 }
 239
 240 int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest)
 241 {
 242         return kvm_apic_id(apic) == dest;
 243 }
 244
 245 int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda)
 246 {
 247         int result = 0;
 248         u8 logical_id;
 249
 250         logical_id = GET_APIC_LOGICAL_ID(apic_get_reg(apic, APIC_LDR));
 251
 252         switch (apic_get_reg(apic, APIC_DFR)) {
 253         case APIC_DFR_FLAT:
 254                 if (logical_id & mda)
 255                         result = 1;
 256                 break;
 257         case APIC_DFR_CLUSTER:
 258                 if (((logical_id >> 4) == (mda >> 0x4))
 259                     && (logical_id & mda & 0xf))
 260                         result = 1;
 261                 break;
 262         default:
 263                 printk(KERN_WARNING "Bad DFR vcpu %d: %08x\n",
 264                        apic->vcpu->vcpu_id, apic_get_reg(apic, APIC_DFR));
 265                 break;
 266         }
 267
 268         return result;
 269 }
 270
 271 static int apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
 272                            int short_hand, int dest, int dest_mode)
 273 {
 274         int result = 0;
 275         struct kvm_lapic *target = vcpu->arch.apic;
 276
 277         apic_debug("target %p, source %p, dest 0x%x, "
 278                    "dest_mode 0x%x, short_hand 0x%x",
 279                    target, source, dest, dest_mode, short_hand);
 280
 281         ASSERT(!target);
 282         switch (short_hand) {
 283         case APIC_DEST_NOSHORT:
 284                 if (dest_mode == 0) {
 285                         /* Physical mode. */
 286                         if ((dest == 0xFF) || (dest == kvm_apic_id(target)))
 287                                 result = 1;
 288                 } else
 289                         /* Logical mode. */
 290                         result = kvm_apic_match_logical_addr(target, dest);
 291                 break;
 292         case APIC_DEST_SELF:
 293                 if (target == source)
 294                         result = 1;
 295                 break;
 296         case APIC_DEST_ALLINC:
 297                 result = 1;
 298                 break;
 299         case APIC_DEST_ALLBUT:
 300                 if (target != source)
 301                         result = 1;
 302                 break;
 303         default:
 304                 printk(KERN_WARNING "Bad dest shorthand value %x\n",
 305                        short_hand);
 306                 break;
 307         }
 308
 309         return result;
 310 }
 311
 312 /*
 313  * Add a pending IRQ into lapic.
 314  * Return 1 if successfully added and 0 if discarded.
 315  */
 316 static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
 317                              int vector, int level, int trig_mode)
 318 {
 319         int orig_irr, result = 0;
 320         struct kvm_vcpu *vcpu = apic->vcpu;
 321
 322         switch (delivery_mode) {
 323         case APIC_DM_FIXED:
 324         case APIC_DM_LOWEST:
 325                 /* FIXME add logic for vcpu on reset */
 326                 if (unlikely(!apic_enabled(apic)))
 327                         break;
 328
 329                 orig_irr = apic_test_and_set_irr(vector, apic);
 330                 if (orig_irr && trig_mode) {
 331                         apic_debug("level trig mode repeatedly for vector %d",
 332                                    vector);
 333                         break;
 334                 }
 335
 336                 if (trig_mode) {
 337                         apic_debug("level trig mode for vector %d", vector);
 338                         apic_set_vector(vector, apic->regs + APIC_TMR);
 339                 } else
 340                         apic_clear_vector(vector, apic->regs + APIC_TMR);
 341
 342                 kvm_vcpu_kick(vcpu);
 343
 344                 result = (orig_irr == 0);
 345                 break;
 346
 347         case APIC_DM_REMRD:
 348                 printk(KERN_DEBUG "Ignoring delivery mode 3\n");
 349                 break;
 350
 351         case APIC_DM_SMI:
 352                 printk(KERN_DEBUG "Ignoring guest SMI\n");
 353                 break;
 354
 355         case APIC_DM_NMI:
 356                 kvm_inject_nmi(vcpu);
 357                 break;
 358
 359         case APIC_DM_INIT:
 360                 if (level) {
 361                         if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE)
 362                                 printk(KERN_DEBUG
 363                                        "INIT on a runnable vcpu %d\n",
 364                                        vcpu->vcpu_id);
 365                         vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
 366                         kvm_vcpu_kick(vcpu);
 367                 } else {
 368                         apic_debug("Ignoring de-assert INIT to vcpu %d\n",
 369                                    vcpu->vcpu_id);
 370                 }
 371                 break;
 372
 373         case APIC_DM_STARTUP:
 374                 apic_debug("SIPI to vcpu %d vector 0x%02x\n",
 375                            vcpu->vcpu_id, vector);
 376                 if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
 377                         vcpu->arch.sipi_vector = vector;
 378                         vcpu->arch.mp_state = KVM_MP_STATE_SIPI_RECEIVED;
 379                         kvm_vcpu_kick(vcpu);
 380                 }
 381                 break;
 382
 383         default:
 384                 printk(KERN_ERR "TODO: unsupported delivery mode %x\n",
 385                        delivery_mode);
 386                 break;
 387         }
 388         return result;
 389 }
 390
 391 static struct kvm_lapic *kvm_apic_round_robin(struct kvm *kvm, u8 vector,
 392                                        unsigned long bitmap)
 393 {
 394         int last;
 395         int next;
 396         struct kvm_lapic *apic = NULL;
 397
 398         last = kvm->arch.round_robin_prev_vcpu;
 399         next = last;
 400
 401         do {
 402                 if (++next == KVM_MAX_VCPUS)
 403                         next = 0;
 404                 if (kvm->vcpus[next] == NULL || !test_bit(next, &bitmap))
 405                         continue;
 406                 apic = kvm->vcpus[next]->arch.apic;
 407                 if (apic && apic_enabled(apic))
 408                         break;
 409                 apic = NULL;
 410         } while (next != last);
 411         kvm->arch.round_robin_prev_vcpu = next;
 412
 413         if (!apic)
 414                 printk(KERN_DEBUG "vcpu not ready for apic_round_robin\n");
 415
 416         return apic;
 417 }
 418
 419 struct kvm_vcpu *kvm_get_lowest_prio_vcpu(struct kvm *kvm, u8 vector,
 420                 unsigned long bitmap)
 421 {
 422         struct kvm_lapic *apic;
 423
 424         apic = kvm_apic_round_robin(kvm, vector, bitmap);
 425         if (apic)
 426                 return apic->vcpu;
 427         return NULL;
 428 }
 429
 430 static void apic_set_eoi(struct kvm_lapic *apic)
 431 {
 432         int vector = apic_find_highest_isr(apic);
 433         int trigger_mode;
 434         /*
 435          * Not every write EOI will has corresponding ISR,
 436          * one example is when Kernel check timer on setup_IO_APIC
 437          */
 438         if (vector == -1)
 439                 return;
 440
 441         apic_clear_vector(vector, apic->regs + APIC_ISR);
 442         apic_update_ppr(apic);
 443
 444         if (apic_test_and_clear_vector(vector, apic->regs + APIC_TMR))
 445                 trigger_mode = IOAPIC_LEVEL_TRIG;
 446         else
 447                 trigger_mode = IOAPIC_EDGE_TRIG;
 448         kvm_ioapic_update_eoi(apic->vcpu->kvm, vector, trigger_mode);
 449 }
 450
 451 static void apic_send_ipi(struct kvm_lapic *apic)
 452 {
 453         u32 icr_low = apic_get_reg(apic, APIC_ICR);
 454         u32 icr_high = apic_get_reg(apic, APIC_ICR2);
 455
 456         unsigned int dest = GET_APIC_DEST_FIELD(icr_high);
 457         unsigned int short_hand = icr_low & APIC_SHORT_MASK;
 458         unsigned int trig_mode = icr_low & APIC_INT_LEVELTRIG;
 459         unsigned int level = icr_low & APIC_INT_ASSERT;
 460         unsigned int dest_mode = icr_low & APIC_DEST_MASK;
 461         unsigned int delivery_mode = icr_low & APIC_MODE_MASK;
 462         unsigned int vector = icr_low & APIC_VECTOR_MASK;
 463
 464         struct kvm_vcpu *target;
 465         struct kvm_vcpu *vcpu;
 466         unsigned long lpr_map = 0;
 467         int i;
 468
 469         apic_debug("icr_high 0x%x, icr_low 0x%x, "
 470                    "short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
 471                    "dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x\n",
 472                    icr_high, icr_low, short_hand, dest,
 473                    trig_mode, level, dest_mode, delivery_mode, vector);
 474
 475         for (i = 0; i < KVM_MAX_VCPUS; i++) {
 476                 vcpu = apic->vcpu->kvm->vcpus[i];
 477                 if (!vcpu)
 478                         continue;
 479
 480                 if (vcpu->arch.apic &&
 481                     apic_match_dest(vcpu, apic, short_hand, dest, dest_mode)) {
 482                         if (delivery_mode == APIC_DM_LOWEST)
 483                                 set_bit(vcpu->vcpu_id, &lpr_map);
 484                         else
 485                                 __apic_accept_irq(vcpu->arch.apic, delivery_mode,
 486                                                   vector, level, trig_mode);
 487                 }
 488         }
 489
 490         if (delivery_mode == APIC_DM_LOWEST) {
 491                 target = kvm_get_lowest_prio_vcpu(vcpu->kvm, vector, lpr_map);
 492                 if (target != NULL)
 493                         __apic_accept_irq(target->arch.apic, delivery_mode,
 494                                           vector, level, trig_mode);
 495         }
 496 }
 497
 498 static u32 apic_get_tmcct(struct kvm_lapic *apic)
 499 {
 500         u64 counter_passed;
 501         ktime_t passed, now;
 502         u32 tmcct;
 503
 504         ASSERT(apic != NULL);
 505
 506         now = apic->timer.dev.base->get_time();
 507         tmcct = apic_get_reg(apic, APIC_TMICT);
 508
 509         /* if initial count is 0, current count should also be 0 */
 510         if (tmcct == 0)
 511                 return 0;
 512
 513         if (unlikely(ktime_to_ns(now) <=
 514                 ktime_to_ns(apic->timer.last_update))) {
 515                 /* Wrap around */
 516                 passed = ktime_add(( {
 517                                     (ktime_t) {
 518                                     .tv64 = KTIME_MAX -
 519                                     (apic->timer.last_update).tv64}; }
 520                                    ), now);
 521                 apic_debug("time elapsed\n");
 522         } else
 523                 passed = ktime_sub(now, apic->timer.last_update);
 524
 525         counter_passed = div64_u64(ktime_to_ns(passed),
 526                                    (APIC_BUS_CYCLE_NS * apic->timer.divide_count));
 527
 528         if (counter_passed > tmcct) {
 529                 if (unlikely(!apic_lvtt_period(apic))) {
 530                         /* one-shot timers stick at 0 until reset */
 531                         tmcct = 0;
 532                 } else {
 533                         /*
 534                          * periodic timers reset to APIC_TMICT when they
 535                          * hit 0. The while loop simulates this happening N
 536                          * times. (counter_passed %= tmcct) would also work,
 537                          * but might be slower or not work on 32-bit??
 538                          */
 539                         while (counter_passed > tmcct)
 540                                 counter_passed -= tmcct;
 541                         tmcct -= counter_passed;
 542                 }
 543         } else {
 544                 tmcct -= counter_passed;
 545         }
 546
 547         return tmcct;
 548 }
 549
 550 static void __report_tpr_access(struct kvm_lapic *apic, bool write)
 551 {
 552         struct kvm_vcpu *vcpu = apic->vcpu;
 553         struct kvm_run *run = vcpu->run;
 554
 555         set_bit(KVM_REQ_REPORT_TPR_ACCESS, &vcpu->requests);
 556         run->tpr_access.rip = kvm_rip_read(vcpu);
 557         run->tpr_access.is_write = write;
 558 }
 559
 560 static inline void report_tpr_access(struct kvm_lapic *apic, bool write)
 561 {
 562         if (apic->vcpu->arch.tpr_access_reporting)
 563                 __report_tpr_access(apic, write);
 564 }
 565
 566 static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset)
 567 {
 568         u32 val = 0;
 569
 570         KVMTRACE_1D(APIC_ACCESS, apic->vcpu, (u32)offset, handler);
 571
 572         if (offset >= LAPIC_MMIO_LENGTH)
 573                 return 0;
 574
 575         switch (offset) {
 576         case APIC_ARBPRI:
 577                 printk(KERN_WARNING "Access APIC ARBPRI register "
 578                        "which is for P6\n");
 579                 break;
 580
 581         case APIC_TMCCT:        /* Timer CCR */
 582                 val = apic_get_tmcct(apic);
 583                 break;
 584
 585         case APIC_TASKPRI:
 586                 report_tpr_access(apic, false);
 587                 /* fall thru */
 588         default:
 589                 apic_update_ppr(apic);
 590                 val = apic_get_reg(apic, offset);
 591                 break;
 592         }
 593
 594         return val;
 595 }
 596
 597 static void apic_mmio_read(struct kvm_io_device *this,
 598                            gpa_t address, int len, void *data)
 599 {
 600         struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
 601         unsigned int offset = address - apic->base_address;
 602         unsigned char alignment = offset & 0xf;
 603         u32 result;
 604
 605         if ((alignment + len) > 4) {
 606                 printk(KERN_ERR "KVM_APIC_READ: alignment error %lx %d",
 607                        (unsigned long)address, len);
 608                 return;
 609         }
 610         result = __apic_read(apic, offset & ~0xf);
 611
 612         switch (len) {
 613         case 1:
 614         case 2:
 615         case 4:
 616                 memcpy(data, (char *)&result + alignment, len);
 617                 break;
 618         default:
 619                 printk(KERN_ERR "Local APIC read with len = %x, "
 620                        "should be 1,2, or 4 instead\n", len);
 621                 break;
 622         }
 623 }
 624
 625 static void update_divide_count(struct kvm_lapic *apic)
 626 {
 627         u32 tmp1, tmp2, tdcr;
 628
 629         tdcr = apic_get_reg(apic, APIC_TDCR);
 630         tmp1 = tdcr & 0xf;
 631         tmp2 = ((tmp1 & 0x3) | ((tmp1 & 0x8) >> 1)) + 1;
 632         apic->timer.divide_count = 0x1 << (tmp2 & 0x7);
 633
 634         apic_debug("timer divide count is 0x%x\n",
 635                                    apic->timer.divide_count);
 636 }
 637
 638 static void start_apic_timer(struct kvm_lapic *apic)
 639 {
 640         ktime_t now = apic->timer.dev.base->get_time();
 641
 642         apic->timer.last_update = now;
 643
 644         apic->timer.period = apic_get_reg(apic, APIC_TMICT) *
 645                     APIC_BUS_CYCLE_NS * apic->timer.divide_count;
 646         atomic_set(&apic->timer.pending, 0);
 647
 648         if (!apic->timer.period)
 649                 return;
 650
 651         hrtimer_start(&apic->timer.dev,
 652                       ktime_add_ns(now, apic->timer.period),
 653                       HRTIMER_MODE_ABS);
 654
 655         apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016"
 656                            PRIx64 ", "
 657                            "timer initial count 0x%x, period %lldns, "
 658                            "expire @ 0x%016" PRIx64 ".\n", __func__,
 659                            APIC_BUS_CYCLE_NS, ktime_to_ns(now),
 660                            apic_get_reg(apic, APIC_TMICT),
 661                            apic->timer.period,
 662                            ktime_to_ns(ktime_add_ns(now,
 663                                         apic->timer.period)));
 664 }
 665
 666 static void apic_mmio_write(struct kvm_io_device *this,
 667                             gpa_t address, int len, const void *data)
 668 {
 669         struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
 670         unsigned int offset = address - apic->base_address;
 671         unsigned char alignment = offset & 0xf;
 672         u32 val;
 673
 674         /*
 675          * APIC register must be aligned on 128-bits boundary.
 676          * 32/64/128 bits registers must be accessed thru 32 bits.
 677          * Refer SDM 8.4.1
 678          */
 679         if (len != 4 || alignment) {
 680                 /* Don't shout loud, $infamous_os would cause only noise. */
 681                 apic_debug("apic write: bad size=%d %lx\n",
 682                            len, (long)address);
 683                 return;
 684         }
 685
 686         val = *(u32 *) data;
 687
 688         /* too common printing */
 689         if (offset != APIC_EOI)
 690                 apic_debug("%s: offset 0x%x with length 0x%x, and value is "
 691                            "0x%x\n", __func__, offset, len, val);
 692
 693         offset &= 0xff0;
 694
 695         KVMTRACE_1D(APIC_ACCESS, apic->vcpu, (u32)offset, handler);
 696
 697         switch (offset) {
 698         case APIC_ID:           /* Local APIC ID */
 699                 apic_set_reg(apic, APIC_ID, val);
 700                 break;
 701
 702         case APIC_TASKPRI:
 703                 report_tpr_access(apic, true);
 704                 apic_set_tpr(apic, val & 0xff);
 705                 break;
 706
 707         case APIC_EOI:
 708                 apic_set_eoi(apic);
 709                 break;
 710
 711         case APIC_LDR:
 712                 apic_set_reg(apic, APIC_LDR, val & APIC_LDR_MASK);
 713                 break;
 714
 715         case APIC_DFR:
 716                 apic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
 717                 break;
 718
 719         case APIC_SPIV:
 720                 apic_set_reg(apic, APIC_SPIV, val & 0x3ff);
 721                 if (!(val & APIC_SPIV_APIC_ENABLED)) {
 722                         int i;
 723                         u32 lvt_val;
 724
 725                         for (i = 0; i < APIC_LVT_NUM; i++) {
 726                                 lvt_val = apic_get_reg(apic,
 727                                                        APIC_LVTT + 0x10 * i);
 728                                 apic_set_reg(apic, APIC_LVTT + 0x10 * i,
 729                                              lvt_val | APIC_LVT_MASKED);
 730                         }
 731                         atomic_set(&apic->timer.pending, 0);
 732
 733                 }
 734                 break;
 735
 736         case APIC_ICR:
 737                 /* No delay here, so we always clear the pending bit */
 738                 apic_set_reg(apic, APIC_ICR, val & ~(1 << 12));
 739                 apic_send_ipi(apic);
 740                 break;
 741
 742         case APIC_ICR2:
 743                 apic_set_reg(apic, APIC_ICR2, val & 0xff000000);
 744                 break;
 745
 746         case APIC_LVTT:
 747         case APIC_LVTTHMR:
 748         case APIC_LVTPC:
 749         case APIC_LVT0:
 750         case APIC_LVT1:
 751         case APIC_LVTERR:
 752                 /* TODO: Check vector */
 753                 if (!apic_sw_enabled(apic))
 754                         val |= APIC_LVT_MASKED;
 755
 756                 val &= apic_lvt_mask[(offset - APIC_LVTT) >> 4];
 757                 apic_set_reg(apic, offset, val);
 758
 759                 break;
 760
 761         case APIC_TMICT:
 762                 hrtimer_cancel(&apic->timer.dev);
 763                 apic_set_reg(apic, APIC_TMICT, val);
 764                 start_apic_timer(apic);
 765                 return;
 766
 767         case APIC_TDCR:
 768                 if (val & 4)
 769                         printk(KERN_ERR "KVM_WRITE:TDCR %x\n", val);
 770                 apic_set_reg(apic, APIC_TDCR, val);
 771                 update_divide_count(apic);
 772                 break;
 773
 774         default:
 775                 apic_debug("Local APIC Write to read-only register %x\n",
 776                            offset);
 777                 break;
 778         }
 779
 780 }
 781
 782 static int apic_mmio_range(struct kvm_io_device *this, gpa_t addr,
 783                            int len, int size)
 784 {
 785         struct kvm_lapic *apic = (struct kvm_lapic *)this->private;
 786         int ret = 0;
 787
 788
 789         if (apic_hw_enabled(apic) &&
 790             (addr >= apic->base_address) &&
 791             (addr < (apic->base_address + LAPIC_MMIO_LENGTH)))
 792                 ret = 1;
 793
 794         return ret;
 795 }
 796
 797 void kvm_free_lapic(struct kvm_vcpu *vcpu)
 798 {
 799         if (!vcpu->arch.apic)
 800                 return;
 801
 802         hrtimer_cancel(&vcpu->arch.apic->timer.dev);
 803
 804         if (vcpu->arch.apic->regs_page)
 805                 __free_page(vcpu->arch.apic->regs_page);
 806
 807         kfree(vcpu->arch.apic);
 808 }
 809
 810 /*
 811  *----------------------------------------------------------------------
 812  * LAPIC interface
 813  *----------------------------------------------------------------------
 814  */
 815
 816 void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8)
 817 {
 818         struct kvm_lapic *apic = vcpu->arch.apic;
 819
 820         if (!apic)
 821                 return;
 822         apic_set_tpr(apic, ((cr8 & 0x0f) << 4)
 823                      | (apic_get_reg(apic, APIC_TASKPRI) & 4));
 824 }
 825 EXPORT_SYMBOL_GPL(kvm_lapic_set_tpr);
 826
 827 u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
 828 {
 829         struct kvm_lapic *apic = vcpu->arch.apic;
 830         u64 tpr;
 831
 832         if (!apic)
 833                 return 0;
 834         tpr = (u64) apic_get_reg(apic, APIC_TASKPRI);
 835
 836         return (tpr & 0xf0) >> 4;
 837 }
 838 EXPORT_SYMBOL_GPL(kvm_lapic_get_cr8);
 839
 840 void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
 841 {
 842         struct kvm_lapic *apic = vcpu->arch.apic;
 843
 844         if (!apic) {
 845                 value |= MSR_IA32_APICBASE_BSP;
 846                 vcpu->arch.apic_base = value;
 847                 return;
 848         }
 849         if (apic->vcpu->vcpu_id)
 850                 value &= ~MSR_IA32_APICBASE_BSP;
 851
 852         vcpu->arch.apic_base = value;
 853         apic->base_address = apic->vcpu->arch.apic_base &
 854                              MSR_IA32_APICBASE_BASE;
 855
 856         /* with FSB delivery interrupt, we can restart APIC functionality */
 857         apic_debug("apic base msr is 0x%016" PRIx64 ", and base address is "
 858                    "0x%lx.\n", apic->vcpu->arch.apic_base, apic->base_address);
 859
 860 }
 861
 862 u64 kvm_lapic_get_base(struct kvm_vcpu *vcpu)
 863 {
 864         return vcpu->arch.apic_base;
 865 }
 866 EXPORT_SYMBOL_GPL(kvm_lapic_get_base);
 867
 868 void kvm_lapic_reset(struct kvm_vcpu *vcpu)
 869 {
 870         struct kvm_lapic *apic;
 871         int i;
 872
 873         apic_debug("%s\n", __func__);
 874
 875         ASSERT(vcpu);
 876         apic = vcpu->arch.apic;
 877         ASSERT(apic != NULL);
 878
 879         /* Stop the timer in case it's a reset to an active apic */
 880         hrtimer_cancel(&apic->timer.dev);
 881
 882         apic_set_reg(apic, APIC_ID, vcpu->vcpu_id << 24);
 883         apic_set_reg(apic, APIC_LVR, APIC_VERSION);
 884
 885         for (i = 0; i < APIC_LVT_NUM; i++)
 886                 apic_set_reg(apic, APIC_LVTT + 0x10 * i, APIC_LVT_MASKED);
 887         apic_set_reg(apic, APIC_LVT0,
 888                      SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT));
 889
 890         apic_set_reg(apic, APIC_DFR, 0xffffffffU);
 891         apic_set_reg(apic, APIC_SPIV, 0xff);
 892         apic_set_reg(apic, APIC_TASKPRI, 0);
 893         apic_set_reg(apic, APIC_LDR, 0);
 894         apic_set_reg(apic, APIC_ESR, 0);
 895         apic_set_reg(apic, APIC_ICR, 0);
 896         apic_set_reg(apic, APIC_ICR2, 0);
 897         apic_set_reg(apic, APIC_TDCR, 0);
 898         apic_set_reg(apic, APIC_TMICT, 0);
 899         for (i = 0; i < 8; i++) {
 900                 apic_set_reg(apic, APIC_IRR + 0x10 * i, 0);
 901                 apic_set_reg(apic, APIC_ISR + 0x10 * i, 0);
 902                 apic_set_reg(apic, APIC_TMR + 0x10 * i, 0);
 903         }
 904         update_divide_count(apic);
 905         atomic_set(&apic->timer.pending, 0);
 906         if (vcpu->vcpu_id == 0)
 907                 vcpu->arch.apic_base |= MSR_IA32_APICBASE_BSP;
 908         apic_update_ppr(apic);
 909
 910         apic_debug(KERN_INFO "%s: vcpu=%p, id=%d, base_msr="
 911                    "0x%016" PRIx64 ", base_address=0x%0lx.\n", __func__,
 912                    vcpu, kvm_apic_id(apic),
 913                    vcpu->arch.apic_base, apic->base_address);
 914 }
 915 EXPORT_SYMBOL_GPL(kvm_lapic_reset);
 916
 917 int kvm_lapic_enabled(struct kvm_vcpu *vcpu)
 918 {
 919         struct kvm_lapic *apic = vcpu->arch.apic;
 920         int ret = 0;
 921
 922         if (!apic)
 923                 return 0;
 924         ret = apic_enabled(apic);
 925
 926         return ret;
 927 }
 928 EXPORT_SYMBOL_GPL(kvm_lapic_enabled);
 929
 930 /*
 931  *----------------------------------------------------------------------
 932  * timer interface
 933  *----------------------------------------------------------------------
 934  */
 935
 936 /* TODO: make sure __apic_timer_fn runs in current pCPU */
 937 static int __apic_timer_fn(struct kvm_lapic *apic)
 938 {
 939         int result = 0;
 940         wait_queue_head_t *q = &apic->vcpu->wq;
 941
 942         if(!atomic_inc_and_test(&apic->timer.pending))
 943                 set_bit(KVM_REQ_PENDING_TIMER, &apic->vcpu->requests);
 944         if (waitqueue_active(q))
 945                 wake_up_interruptible(q);
 946
 947         if (apic_lvtt_period(apic)) {
 948                 result = 1;
 949                 apic->timer.dev.expires = ktime_add_ns(
 950                                         apic->timer.dev.expires,
 951                                         apic->timer.period);
 952         }
 953         return result;
 954 }
 955
 956 int apic_has_pending_timer(struct kvm_vcpu *vcpu)
 957 {
 958         struct kvm_lapic *lapic = vcpu->arch.apic;
 959
 960         if (lapic && apic_enabled(lapic) && apic_lvt_enabled(lapic, APIC_LVTT))
 961                 return atomic_read(&lapic->timer.pending);
 962
 963         return 0;
 964 }
 965
 966 static int __inject_apic_timer_irq(struct kvm_lapic *apic)
 967 {
 968         int vector;
 969
 970         vector = apic_lvt_vector(apic, APIC_LVTT);
 971         return __apic_accept_irq(apic, APIC_DM_FIXED, vector, 1, 0);
 972 }
 973
 974 static enum hrtimer_restart apic_timer_fn(struct hrtimer *data)
 975 {
 976         struct kvm_lapic *apic;
 977         int restart_timer = 0;
 978
 979         apic = container_of(data, struct kvm_lapic, timer.dev);
 980
 981         restart_timer = __apic_timer_fn(apic);
 982
 983         if (restart_timer)
 984                 return HRTIMER_RESTART;
 985         else
 986                 return HRTIMER_NORESTART;
 987 }
 988
 989 int kvm_create_lapic(struct kvm_vcpu *vcpu)
 990 {
 991         struct kvm_lapic *apic;
 992
 993         ASSERT(vcpu != NULL);
 994         apic_debug("apic_init %d\n", vcpu->vcpu_id);
 995
 996         apic = kzalloc(sizeof(*apic), GFP_KERNEL);
 997         if (!apic)
 998                 goto nomem;
 999
1000         vcpu->arch.apic = apic;
1001
1002         apic->regs_page = alloc_page(GFP_KERNEL);
1003         if (apic->regs_page == NULL) {
1004                 printk(KERN_ERR "malloc apic regs error for vcpu %x\n",
1005                        vcpu->vcpu_id);
1006                 goto nomem_free_apic;
1007         }
1008         apic->regs = page_address(apic->regs_page);
1009         memset(apic->regs, 0, PAGE_SIZE);
1010         apic->vcpu = vcpu;
1011
1012         hrtimer_init(&apic->timer.dev, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
1013         apic->timer.dev.function = apic_timer_fn;
1014         apic->base_address = APIC_DEFAULT_PHYS_BASE;
1015         vcpu->arch.apic_base = APIC_DEFAULT_PHYS_BASE;
1016
1017         kvm_lapic_reset(vcpu);
1018         apic->dev.read = apic_mmio_read;
1019         apic->dev.write = apic_mmio_write;
1020         apic->dev.in_range = apic_mmio_range;
1021         apic->dev.private = apic;
1022
1023         return 0;
1024 nomem_free_apic:
1025         kfree(apic);
1026 nomem:
1027         return -ENOMEM;
1028 }
1029 EXPORT_SYMBOL_GPL(kvm_create_lapic);
1030
1031 int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
1032 {
1033         struct kvm_lapic *apic = vcpu->arch.apic;
1034         int highest_irr;
1035
1036         if (!apic || !apic_enabled(apic))
1037                 return -1;
1038
1039         apic_update_ppr(apic);
1040         highest_irr = apic_find_highest_irr(apic);
1041         if ((highest_irr == -1) ||
1042             ((highest_irr & 0xF0) <= apic_get_reg(apic, APIC_PROCPRI)))
1043                 return -1;
1044         return highest_irr;
1045 }
1046
1047 int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
1048 {
1049         u32 lvt0 = apic_get_reg(vcpu->arch.apic, APIC_LVT0);
1050         int r = 0;
1051
1052         if (vcpu->vcpu_id == 0) {
1053                 if (!apic_hw_enabled(vcpu->arch.apic))
1054                         r = 1;
1055                 if ((lvt0 & APIC_LVT_MASKED) == 0 &&
1056                     GET_APIC_DELIVERY_MODE(lvt0) == APIC_MODE_EXTINT)
1057                         r = 1;
1058         }
1059         return r;
1060 }
1061
1062 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu)
1063 {
1064         struct kvm_lapic *apic = vcpu->arch.apic;
1065
1066         if (apic && apic_lvt_enabled(apic, APIC_LVTT) &&
1067                 atomic_read(&apic->timer.pending) > 0) {
1068                 if (__inject_apic_timer_irq(apic))
1069                         atomic_dec(&apic->timer.pending);
1070         }
1071 }
1072
1073 void kvm_apic_timer_intr_post(struct kvm_vcpu *vcpu, int vec)
1074 {
1075         struct kvm_lapic *apic = vcpu->arch.apic;
1076
1077         if (apic && apic_lvt_vector(apic, APIC_LVTT) == vec)
1078                 apic->timer.last_update = ktime_add_ns(
1079                                 apic->timer.last_update,
1080                                 apic->timer.period);
1081 }
1082
1083 int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
1084 {
1085         int vector = kvm_apic_has_interrupt(vcpu);
1086         struct kvm_lapic *apic = vcpu->arch.apic;
1087
1088         if (vector == -1)
1089                 return -1;
1090
1091         apic_set_vector(vector, apic->regs + APIC_ISR);
1092         apic_update_ppr(apic);
1093         apic_clear_irr(vector, apic);
1094         return vector;
1095 }
1096
1097 void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu)
1098 {
1099         struct kvm_lapic *apic = vcpu->arch.apic;
1100
1101         apic->base_address = vcpu->arch.apic_base &
1102                              MSR_IA32_APICBASE_BASE;
1103         apic_set_reg(apic, APIC_LVR, APIC_VERSION);
1104         apic_update_ppr(apic);
1105         hrtimer_cancel(&apic->timer.dev);
1106         update_divide_count(apic);
1107         start_apic_timer(apic);
1108 }
1109
1110 void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
1111 {
1112         struct kvm_lapic *apic = vcpu->arch.apic;
1113         struct hrtimer *timer;
1114
1115         if (!apic)
1116                 return;
1117
1118         timer = &apic->timer.dev;
1119         if (hrtimer_cancel(timer))
1120                 hrtimer_start(timer, timer->expires, HRTIMER_MODE_ABS);
1121 }
1122
1123 void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu)
1124 {
1125         u32 data;
1126         void *vapic;
1127
1128         if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr)
1129                 return;
1130
1131         vapic = kmap_atomic(vcpu->arch.apic->vapic_page, KM_USER0);
1132         data = *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr));
1133         kunmap_atomic(vapic, KM_USER0);
1134
1135         apic_set_tpr(vcpu->arch.apic, data & 0xff);
1136 }
1137
1138 void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu)
1139 {
1140         u32 data, tpr;
1141         int max_irr, max_isr;
1142         struct kvm_lapic *apic;
1143         void *vapic;
1144
1145         if (!irqchip_in_kernel(vcpu->kvm) || !vcpu->arch.apic->vapic_addr)
1146                 return;
1147
1148         apic = vcpu->arch.apic;
1149         tpr = apic_get_reg(apic, APIC_TASKPRI) & 0xff;
1150         max_irr = apic_find_highest_irr(apic);
1151         if (max_irr < 0)
1152                 max_irr = 0;
1153         max_isr = apic_find_highest_isr(apic);
1154         if (max_isr < 0)
1155                 max_isr = 0;
1156         data = (tpr & 0xff) | ((max_isr & 0xf0) << 8) | (max_irr << 24);
1157
1158         vapic = kmap_atomic(vcpu->arch.apic->vapic_page, KM_USER0);
1159         *(u32 *)(vapic + offset_in_page(vcpu->arch.apic->vapic_addr)) = data;
1160         kunmap_atomic(vapic, KM_USER0);
1161 }
1162
1163 void kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr)
1164 {
1165         if (!irqchip_in_kernel(vcpu->kvm))
1166                 return;
1167
1168         vcpu->arch.apic->vapic_addr = vapic_addr;
1169 }