arch/x86/kvm/ioapic.c

   1 /*
   2  *  Copyright (C) 2001  MandrakeSoft S.A.
   3  *  Copyright 2010 Red Hat, Inc. and/or its affiliates.
   4  *
   5  *    MandrakeSoft S.A.
   6  *    43, rue d'Aboukir
   7  *    75002 Paris - France
   8  *    http://www.linux-mandrake.com/
   9  *    http://www.mandrakesoft.com/
  10  *
  11  *  This library is free software; you can redistribute it and/or
  12  *  modify it under the terms of the GNU Lesser General Public
  13  *  License as published by the Free Software Foundation; either
  14  *  version 2 of the License, or (at your option) any later version.
  15  *
  16  *  This library is distributed in the hope that it will be useful,
  17  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  *  Lesser General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU Lesser General Public
  22  *  License along with this library; if not, write to the Free Software
  23  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  24  *
  25  *  Yunhong Jiang <yunhong.jiang@intel.com>
  26  *  Yaozu (Eddie) Dong <eddie.dong@intel.com>
  27  *  Based on Xen 3.1 code.
  28  */
  29
  30 #include <linux/kvm_host.h>
  31 #include <linux/kvm.h>
  32 #include <linux/mm.h>
  33 #include <linux/highmem.h>
  34 #include <linux/smp.h>
  35 #include <linux/hrtimer.h>
  36 #include <linux/io.h>
  37 #include <linux/slab.h>
  38 #include <linux/export.h>
  39 #include <asm/processor.h>
  40 #include <asm/page.h>
  41 #include <asm/current.h>
  42 #include <trace/events/kvm.h>
  43
  44 #include "ioapic.h"
  45 #include "lapic.h"
  46 #include "irq.h"
  47
  48 #if 0
  49 #define ioapic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg)
  50 #else
  51 #define ioapic_debug(fmt, arg...)
  52 #endif
  53 static int ioapic_service(struct kvm_ioapic *vioapic, int irq,
  54                 bool line_status);
  55
  56 static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
  57                                           unsigned long addr,
  58                                           unsigned long length)
  59 {
  60         unsigned long result = 0;
  61
  62         switch (ioapic->ioregsel) {
  63         case IOAPIC_REG_VERSION:
  64                 result = ((((IOAPIC_NUM_PINS - 1) & 0xff) << 16)
  65                           | (IOAPIC_VERSION_ID & 0xff));
  66                 break;
  67
  68         case IOAPIC_REG_APIC_ID:
  69         case IOAPIC_REG_ARB_ID:
  70                 result = ((ioapic->id & 0xf) << 24);
  71                 break;
  72
  73         default:
  74                 {
  75                         u32 redir_index = (ioapic->ioregsel - 0x10) >> 1;
  76                         u64 redir_content;
  77
  78                         if (redir_index < IOAPIC_NUM_PINS)
  79                                 redir_content =
  80                                         ioapic->redirtbl[redir_index].bits;
  81                         else
  82                                 redir_content = ~0ULL;
  83
  84                         result = (ioapic->ioregsel & 0x1) ?
  85                             (redir_content >> 32) & 0xffffffff :
  86                             redir_content & 0xffffffff;
  87                         break;
  88                 }
  89         }
  90
  91         return result;
  92 }
  93
  94 static void rtc_irq_eoi_tracking_reset(struct kvm_ioapic *ioapic)
  95 {
  96         ioapic->rtc_status.pending_eoi = 0;
  97         bitmap_zero(ioapic->rtc_status.dest_map, KVM_MAX_VCPUS);
  98 }
  99
 100 static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic);
 101
 102 static void rtc_status_pending_eoi_check_valid(struct kvm_ioapic *ioapic)
 103 {
 104         if (WARN_ON(ioapic->rtc_status.pending_eoi < 0))
 105                 kvm_rtc_eoi_tracking_restore_all(ioapic);
 106 }
 107
 108 static void __rtc_irq_eoi_tracking_restore_one(struct kvm_vcpu *vcpu)
 109 {
 110         bool new_val, old_val;
 111         struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
 112         union kvm_ioapic_redirect_entry *e;
 113
 114         e = &ioapic->redirtbl[RTC_GSI];
 115         if (!kvm_apic_match_dest(vcpu, NULL, 0, e->fields.dest_id,
 116                                 e->fields.dest_mode))
 117                 return;
 118
 119         new_val = kvm_apic_pending_eoi(vcpu, e->fields.vector);
 120         old_val = test_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map);
 121
 122         if (new_val == old_val)
 123                 return;
 124
 125         if (new_val) {
 126                 __set_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map);
 127                 ioapic->rtc_status.pending_eoi++;
 128         } else {
 129                 __clear_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map);
 130                 ioapic->rtc_status.pending_eoi--;
 131                 rtc_status_pending_eoi_check_valid(ioapic);
 132         }
 133 }
 134
 135 void kvm_rtc_eoi_tracking_restore_one(struct kvm_vcpu *vcpu)
 136 {
 137         struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
 138
 139         spin_lock(&ioapic->lock);
 140         __rtc_irq_eoi_tracking_restore_one(vcpu);
 141         spin_unlock(&ioapic->lock);
 142 }
 143
 144 static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic)
 145 {
 146         struct kvm_vcpu *vcpu;
 147         int i;
 148
 149         if (RTC_GSI >= IOAPIC_NUM_PINS)
 150                 return;
 151
 152         rtc_irq_eoi_tracking_reset(ioapic);
 153         kvm_for_each_vcpu(i, vcpu, ioapic->kvm)
 154             __rtc_irq_eoi_tracking_restore_one(vcpu);
 155 }
 156
 157 static void rtc_irq_eoi(struct kvm_ioapic *ioapic, struct kvm_vcpu *vcpu)
 158 {
 159         if (test_and_clear_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map)) {
 160                 --ioapic->rtc_status.pending_eoi;
 161                 rtc_status_pending_eoi_check_valid(ioapic);
 162         }
 163 }
 164
 165 static bool rtc_irq_check_coalesced(struct kvm_ioapic *ioapic)
 166 {
 167         if (ioapic->rtc_status.pending_eoi > 0)
 168                 return true; /* coalesced */
 169
 170         return false;
 171 }
 172
 173 static int ioapic_set_irq(struct kvm_ioapic *ioapic, unsigned int irq,
 174                 int irq_level, bool line_status)
 175 {
 176         union kvm_ioapic_redirect_entry entry;
 177         u32 mask = 1 << irq;
 178         u32 old_irr;
 179         int edge, ret;
 180
 181         entry = ioapic->redirtbl[irq];
 182         edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG);
 183
 184         if (!irq_level) {
 185                 ioapic->irr &= ~mask;
 186                 ret = 1;
 187                 goto out;
 188         }
 189
 190         /*
 191          * Return 0 for coalesced interrupts; for edge-triggered interrupts,
 192          * this only happens if a previous edge has not been delivered due
 193          * do masking.  For level interrupts, the remote_irr field tells
 194          * us if the interrupt is waiting for an EOI.
 195          *
 196          * RTC is special: it is edge-triggered, but userspace likes to know
 197          * if it has been already ack-ed via EOI because coalesced RTC
 198          * interrupts lead to time drift in Windows guests.  So we track
 199          * EOI manually for the RTC interrupt.
 200          */
 201         if (irq == RTC_GSI && line_status &&
 202                 rtc_irq_check_coalesced(ioapic)) {
 203                 ret = 0;
 204                 goto out;
 205         }
 206
 207         old_irr = ioapic->irr;
 208         ioapic->irr |= mask;
 209         if (edge)
 210                 ioapic->irr_delivered &= ~mask;
 211         if ((edge && old_irr == ioapic->irr) ||
 212             (!edge && entry.fields.remote_irr)) {
 213                 ret = 0;
 214                 goto out;
 215         }
 216
 217         ret = ioapic_service(ioapic, irq, line_status);
 218
 219 out:
 220         trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0);
 221         return ret;
 222 }
 223
 224 static void kvm_ioapic_inject_all(struct kvm_ioapic *ioapic, unsigned long irr)
 225 {
 226         u32 idx;
 227
 228         rtc_irq_eoi_tracking_reset(ioapic);
 229         for_each_set_bit(idx, &irr, IOAPIC_NUM_PINS)
 230                 ioapic_set_irq(ioapic, idx, 1, true);
 231
 232         kvm_rtc_eoi_tracking_restore_all(ioapic);
 233 }
 234
 235
 236 void kvm_ioapic_scan_entry(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap)
 237 {
 238         struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
 239         union kvm_ioapic_redirect_entry *e;
 240         int index;
 241
 242         spin_lock(&ioapic->lock);
 243         for (index = 0; index < IOAPIC_NUM_PINS; index++) {
 244                 e = &ioapic->redirtbl[index];
 245                 if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG ||
 246                     kvm_irq_has_notifier(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index) ||
 247                     index == RTC_GSI) {
 248                         if (kvm_apic_match_dest(vcpu, NULL, 0,
 249                                      e->fields.dest_id, e->fields.dest_mode) ||
 250                             (e->fields.trig_mode == IOAPIC_EDGE_TRIG &&
 251                              kvm_apic_pending_eoi(vcpu, e->fields.vector)))
 252                                 __set_bit(e->fields.vector,
 253                                         (unsigned long *)eoi_exit_bitmap);
 254                 }
 255         }
 256         spin_unlock(&ioapic->lock);
 257 }
 258
 259 void kvm_vcpu_request_scan_ioapic(struct kvm *kvm)
 260 {
 261         struct kvm_ioapic *ioapic = kvm->arch.vioapic;
 262
 263         if (!ioapic)
 264                 return;
 265         kvm_make_scan_ioapic_request(kvm);
 266 }
 267
 268 static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
 269 {
 270         unsigned index;
 271         bool mask_before, mask_after;
 272         union kvm_ioapic_redirect_entry *e;
 273
 274         switch (ioapic->ioregsel) {
 275         case IOAPIC_REG_VERSION:
 276                 /* Writes are ignored. */
 277                 break;
 278
 279         case IOAPIC_REG_APIC_ID:
 280                 ioapic->id = (val >> 24) & 0xf;
 281                 break;
 282
 283         case IOAPIC_REG_ARB_ID:
 284                 break;
 285
 286         default:
 287                 index = (ioapic->ioregsel - 0x10) >> 1;
 288
 289                 ioapic_debug("change redir index %x val %x\n", index, val);
 290                 if (index >= IOAPIC_NUM_PINS)
 291                         return;
 292                 e = &ioapic->redirtbl[index];
 293                 mask_before = e->fields.mask;
 294                 if (ioapic->ioregsel & 1) {
 295                         e->bits &= 0xffffffff;
 296                         e->bits |= (u64) val << 32;
 297                 } else {
 298                         e->bits &= ~0xffffffffULL;
 299                         e->bits |= (u32) val;
 300                         e->fields.remote_irr = 0;
 301                 }
 302                 mask_after = e->fields.mask;
 303                 if (mask_before != mask_after)
 304                         kvm_fire_mask_notifiers(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index, mask_after);
 305                 if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG
 306                     && ioapic->irr & (1 << index))
 307                         ioapic_service(ioapic, index, false);
 308                 kvm_vcpu_request_scan_ioapic(ioapic->kvm);
 309                 break;
 310         }
 311 }
 312
 313 static int ioapic_service(struct kvm_ioapic *ioapic, int irq, bool line_status)
 314 {
 315         union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq];
 316         struct kvm_lapic_irq irqe;
 317         int ret;
 318
 319         if (entry->fields.mask)
 320                 return -1;
 321
 322         ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
 323                      "vector=%x trig_mode=%x\n",
 324                      entry->fields.dest_id, entry->fields.dest_mode,
 325                      entry->fields.delivery_mode, entry->fields.vector,
 326                      entry->fields.trig_mode);
 327
 328         irqe.dest_id = entry->fields.dest_id;
 329         irqe.vector = entry->fields.vector;
 330         irqe.dest_mode = entry->fields.dest_mode;
 331         irqe.trig_mode = entry->fields.trig_mode;
 332         irqe.delivery_mode = entry->fields.delivery_mode << 8;
 333         irqe.level = 1;
 334         irqe.shorthand = 0;
 335         irqe.msi_redir_hint = false;
 336
 337         if (irqe.trig_mode == IOAPIC_EDGE_TRIG)
 338                 ioapic->irr_delivered |= 1 << irq;
 339
 340         if (irq == RTC_GSI && line_status) {
 341                 /*
 342                  * pending_eoi cannot ever become negative (see
 343                  * rtc_status_pending_eoi_check_valid) and the caller
 344                  * ensures that it is only called if it is >= zero, namely
 345                  * if rtc_irq_check_coalesced returns false).
 346                  */
 347                 BUG_ON(ioapic->rtc_status.pending_eoi != 0);
 348                 ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe,
 349                                 ioapic->rtc_status.dest_map);
 350                 ioapic->rtc_status.pending_eoi = (ret < 0 ? 0 : ret);
 351         } else
 352                 ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, NULL);
 353
 354         if (ret && irqe.trig_mode == IOAPIC_LEVEL_TRIG)
 355                 entry->fields.remote_irr = 1;
 356
 357         return ret;
 358 }
 359
 360 int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id,
 361                        int level, bool line_status)
 362 {
 363         int ret, irq_level;
 364
 365         BUG_ON(irq < 0 || irq >= IOAPIC_NUM_PINS);
 366
 367         spin_lock(&ioapic->lock);
 368         irq_level = __kvm_irq_line_state(&ioapic->irq_states[irq],
 369                                          irq_source_id, level);
 370         ret = ioapic_set_irq(ioapic, irq, irq_level, line_status);
 371
 372         spin_unlock(&ioapic->lock);
 373
 374         return ret;
 375 }
 376
 377 void kvm_ioapic_clear_all(struct kvm_ioapic *ioapic, int irq_source_id)
 378 {
 379         int i;
 380
 381         spin_lock(&ioapic->lock);
 382         for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
 383                 __clear_bit(irq_source_id, &ioapic->irq_states[i]);
 384         spin_unlock(&ioapic->lock);
 385 }
 386
 387 static void kvm_ioapic_eoi_inject_work(struct work_struct *work)
 388 {
 389         int i;
 390         struct kvm_ioapic *ioapic = container_of(work, struct kvm_ioapic,
 391                                                  eoi_inject.work);
 392         spin_lock(&ioapic->lock);
 393         for (i = 0; i < IOAPIC_NUM_PINS; i++) {
 394                 union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i];
 395
 396                 if (ent->fields.trig_mode != IOAPIC_LEVEL_TRIG)
 397                         continue;
 398
 399                 if (ioapic->irr & (1 << i) && !ent->fields.remote_irr)
 400                         ioapic_service(ioapic, i, false);
 401         }
 402         spin_unlock(&ioapic->lock);
 403 }
 404
 405 #define IOAPIC_SUCCESSIVE_IRQ_MAX_COUNT 10000
 406
 407 static void __kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu,
 408                         struct kvm_ioapic *ioapic, int vector, int trigger_mode)
 409 {
 410         int i;
 411         struct kvm_lapic *apic = vcpu->arch.apic;
 412
 413         for (i = 0; i < IOAPIC_NUM_PINS; i++) {
 414                 union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i];
 415
 416                 if (ent->fields.vector != vector)
 417                         continue;
 418
 419                 if (i == RTC_GSI)
 420                         rtc_irq_eoi(ioapic, vcpu);
 421                 /*
 422                  * We are dropping lock while calling ack notifiers because ack
 423                  * notifier callbacks for assigned devices call into IOAPIC
 424                  * recursively. Since remote_irr is cleared only after call
 425                  * to notifiers if the same vector will be delivered while lock
 426                  * is dropped it will be put into irr and will be delivered
 427                  * after ack notifier returns.
 428                  */
 429                 spin_unlock(&ioapic->lock);
 430                 kvm_notify_acked_irq(ioapic->kvm, KVM_IRQCHIP_IOAPIC, i);
 431                 spin_lock(&ioapic->lock);
 432
 433                 if (trigger_mode != IOAPIC_LEVEL_TRIG ||
 434                     kvm_apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_DIRECTED_EOI)
 435                         continue;
 436
 437                 ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
 438                 ent->fields.remote_irr = 0;
 439                 if (!ent->fields.mask && (ioapic->irr & (1 << i))) {
 440                         ++ioapic->irq_eoi[i];
 441                         if (ioapic->irq_eoi[i] == IOAPIC_SUCCESSIVE_IRQ_MAX_COUNT) {
 442                                 /*
 443                                  * Real hardware does not deliver the interrupt
 444                                  * immediately during eoi broadcast, and this
 445                                  * lets a buggy guest make slow progress
 446                                  * even if it does not correctly handle a
 447                                  * level-triggered interrupt.  Emulate this
 448                                  * behavior if we detect an interrupt storm.
 449                                  */
 450                                 schedule_delayed_work(&ioapic->eoi_inject, HZ / 100);
 451                                 ioapic->irq_eoi[i] = 0;
 452                                 trace_kvm_ioapic_delayed_eoi_inj(ent->bits);
 453                         } else {
 454                                 ioapic_service(ioapic, i, false);
 455                         }
 456                 } else {
 457                         ioapic->irq_eoi[i] = 0;
 458                 }
 459         }
 460 }
 461
 462 void kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu, int vector, int trigger_mode)
 463 {
 464         struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
 465
 466         spin_lock(&ioapic->lock);
 467         __kvm_ioapic_update_eoi(vcpu, ioapic, vector, trigger_mode);
 468         spin_unlock(&ioapic->lock);
 469 }
 470
 471 static inline struct kvm_ioapic *to_ioapic(struct kvm_io_device *dev)
 472 {
 473         return container_of(dev, struct kvm_ioapic, dev);
 474 }
 475
 476 static inline int ioapic_in_range(struct kvm_ioapic *ioapic, gpa_t addr)
 477 {
 478         return ((addr >= ioapic->base_address &&
 479                  (addr < ioapic->base_address + IOAPIC_MEM_LENGTH)));
 480 }
 481
 482 static int ioapic_mmio_read(struct kvm_vcpu *vcpu, struct kvm_io_device *this,
 483                                 gpa_t addr, int len, void *val)
 484 {
 485         struct kvm_ioapic *ioapic = to_ioapic(this);
 486         u32 result;
 487         if (!ioapic_in_range(ioapic, addr))
 488                 return -EOPNOTSUPP;
 489
 490         ioapic_debug("addr %lx\n", (unsigned long)addr);
 491         ASSERT(!(addr & 0xf));  /* check alignment */
 492
 493         addr &= 0xff;
 494         spin_lock(&ioapic->lock);
 495         switch (addr) {
 496         case IOAPIC_REG_SELECT:
 497                 result = ioapic->ioregsel;
 498                 break;
 499
 500         case IOAPIC_REG_WINDOW:
 501                 result = ioapic_read_indirect(ioapic, addr, len);
 502                 break;
 503
 504         default:
 505                 result = 0;
 506                 break;
 507         }
 508         spin_unlock(&ioapic->lock);
 509
 510         switch (len) {
 511         case 8:
 512                 *(u64 *) val = result;
 513                 break;
 514         case 1:
 515         case 2:
 516         case 4:
 517                 memcpy(val, (char *)&result, len);
 518                 break;
 519         default:
 520                 printk(KERN_WARNING "ioapic: wrong length %d\n", len);
 521         }
 522         return 0;
 523 }
 524
 525 static int ioapic_mmio_write(struct kvm_vcpu *vcpu, struct kvm_io_device *this,
 526                                  gpa_t addr, int len, const void *val)
 527 {
 528         struct kvm_ioapic *ioapic = to_ioapic(this);
 529         u32 data;
 530         if (!ioapic_in_range(ioapic, addr))
 531                 return -EOPNOTSUPP;
 532
 533         ioapic_debug("ioapic_mmio_write addr=%p len=%d val=%p\n",
 534                      (void*)addr, len, val);
 535         ASSERT(!(addr & 0xf));  /* check alignment */
 536
 537         switch (len) {
 538         case 8:
 539         case 4:
 540                 data = *(u32 *) val;
 541                 break;
 542         case 2:
 543                 data = *(u16 *) val;
 544                 break;
 545         case 1:
 546                 data = *(u8  *) val;
 547                 break;
 548         default:
 549                 printk(KERN_WARNING "ioapic: Unsupported size %d\n", len);
 550                 return 0;
 551         }
 552
 553         addr &= 0xff;
 554         spin_lock(&ioapic->lock);
 555         switch (addr) {
 556         case IOAPIC_REG_SELECT:
 557                 ioapic->ioregsel = data & 0xFF; /* 8-bit register */
 558                 break;
 559
 560         case IOAPIC_REG_WINDOW:
 561                 ioapic_write_indirect(ioapic, data);
 562                 break;
 563
 564         default:
 565                 break;
 566         }
 567         spin_unlock(&ioapic->lock);
 568         return 0;
 569 }
 570
 571 static void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
 572 {
 573         int i;
 574
 575         cancel_delayed_work_sync(&ioapic->eoi_inject);
 576         for (i = 0; i < IOAPIC_NUM_PINS; i++)
 577                 ioapic->redirtbl[i].fields.mask = 1;
 578         ioapic->base_address = IOAPIC_DEFAULT_BASE_ADDRESS;
 579         ioapic->ioregsel = 0;
 580         ioapic->irr = 0;
 581         ioapic->irr_delivered = 0;
 582         ioapic->id = 0;
 583         memset(ioapic->irq_eoi, 0x00, IOAPIC_NUM_PINS);
 584         rtc_irq_eoi_tracking_reset(ioapic);
 585 }
 586
 587 static const struct kvm_io_device_ops ioapic_mmio_ops = {
 588         .read     = ioapic_mmio_read,
 589         .write    = ioapic_mmio_write,
 590 };
 591
 592 int kvm_ioapic_init(struct kvm *kvm)
 593 {
 594         struct kvm_ioapic *ioapic;
 595         int ret;
 596
 597         ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL);
 598         if (!ioapic)
 599                 return -ENOMEM;
 600         spin_lock_init(&ioapic->lock);
 601         INIT_DELAYED_WORK(&ioapic->eoi_inject, kvm_ioapic_eoi_inject_work);
 602         kvm->arch.vioapic = ioapic;
 603         kvm_ioapic_reset(ioapic);
 604         kvm_iodevice_init(&ioapic->dev, &ioapic_mmio_ops);
 605         ioapic->kvm = kvm;
 606         mutex_lock(&kvm->slots_lock);
 607         ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, ioapic->base_address,
 608                                       IOAPIC_MEM_LENGTH, &ioapic->dev);
 609         mutex_unlock(&kvm->slots_lock);
 610         if (ret < 0) {
 611                 kvm->arch.vioapic = NULL;
 612                 kfree(ioapic);
 613                 return ret;
 614         }
 615
 616         kvm_vcpu_request_scan_ioapic(kvm);
 617         return ret;
 618 }
 619
 620 void kvm_ioapic_destroy(struct kvm *kvm)
 621 {
 622         struct kvm_ioapic *ioapic = kvm->arch.vioapic;
 623
 624         cancel_delayed_work_sync(&ioapic->eoi_inject);
 625         kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, &ioapic->dev);
 626         kvm->arch.vioapic = NULL;
 627         kfree(ioapic);
 628 }
 629
 630 int kvm_get_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
 631 {
 632         struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
 633         if (!ioapic)
 634                 return -EINVAL;
 635
 636         spin_lock(&ioapic->lock);
 637         memcpy(state, ioapic, sizeof(struct kvm_ioapic_state));
 638         state->irr &= ~ioapic->irr_delivered;
 639         spin_unlock(&ioapic->lock);
 640         return 0;
 641 }
 642
 643 int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
 644 {
 645         struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
 646         if (!ioapic)
 647                 return -EINVAL;
 648
 649         spin_lock(&ioapic->lock);
 650         memcpy(ioapic, state, sizeof(struct kvm_ioapic_state));
 651         ioapic->irr = 0;
 652         ioapic->irr_delivered = 0;
 653         kvm_vcpu_request_scan_ioapic(kvm);
 654         kvm_ioapic_inject_all(ioapic, state->irr);
 655         spin_unlock(&ioapic->lock);
 656         return 0;
 657 }