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 && old_irr == ioapic->irr) || 210 (!edge && entry.fields.remote_irr)) { 211 ret = 0; 212 goto out; 213 } 214 215 ret = ioapic_service(ioapic, irq, line_status); 216 217 out: 218 trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0); 219 return ret; 220 } 221 222 static void kvm_ioapic_inject_all(struct kvm_ioapic *ioapic, unsigned long irr) 223 { 224 u32 idx; 225 226 rtc_irq_eoi_tracking_reset(ioapic); 227 for_each_set_bit(idx, &irr, IOAPIC_NUM_PINS) 228 ioapic_set_irq(ioapic, idx, 1, true); 229 230 kvm_rtc_eoi_tracking_restore_all(ioapic); 231 } 232 233 234 static void update_handled_vectors(struct kvm_ioapic *ioapic) 235 { 236 DECLARE_BITMAP(handled_vectors, 256); 237 int i; 238 239 memset(handled_vectors, 0, sizeof(handled_vectors)); 240 for (i = 0; i < IOAPIC_NUM_PINS; ++i) 241 __set_bit(ioapic->redirtbl[i].fields.vector, handled_vectors); 242 memcpy(ioapic->handled_vectors, handled_vectors, 243 sizeof(handled_vectors)); 244 smp_wmb(); 245 } 246 247 void kvm_ioapic_scan_entry(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap, 248 u32 *tmr) 249 { 250 struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic; 251 union kvm_ioapic_redirect_entry *e; 252 int index; 253 254 spin_lock(&ioapic->lock); 255 for (index = 0; index < IOAPIC_NUM_PINS; index++) { 256 e = &ioapic->redirtbl[index]; 257 if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG || 258 kvm_irq_has_notifier(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index) || 259 index == RTC_GSI) { 260 if (kvm_apic_match_dest(vcpu, NULL, 0, 261 e->fields.dest_id, e->fields.dest_mode)) { 262 __set_bit(e->fields.vector, 263 (unsigned long *)eoi_exit_bitmap); 264 if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG) 265 __set_bit(e->fields.vector, 266 (unsigned long *)tmr); 267 } 268 } 269 } 270 spin_unlock(&ioapic->lock); 271 } 272 273 void kvm_vcpu_request_scan_ioapic(struct kvm *kvm) 274 { 275 struct kvm_ioapic *ioapic = kvm->arch.vioapic; 276 277 if (!ioapic) 278 return; 279 kvm_make_scan_ioapic_request(kvm); 280 } 281 282 static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val) 283 { 284 unsigned index; 285 bool mask_before, mask_after; 286 union kvm_ioapic_redirect_entry *e; 287 288 switch (ioapic->ioregsel) { 289 case IOAPIC_REG_VERSION: 290 /* Writes are ignored. */ 291 break; 292 293 case IOAPIC_REG_APIC_ID: 294 ioapic->id = (val >> 24) & 0xf; 295 break; 296 297 case IOAPIC_REG_ARB_ID: 298 break; 299 300 default: 301 index = (ioapic->ioregsel - 0x10) >> 1; 302 303 ioapic_debug("change redir index %x val %x\n", index, val); 304 if (index >= IOAPIC_NUM_PINS) 305 return; 306 e = &ioapic->redirtbl[index]; 307 mask_before = e->fields.mask; 308 if (ioapic->ioregsel & 1) { 309 e->bits &= 0xffffffff; 310 e->bits |= (u64) val << 32; 311 } else { 312 e->bits &= ~0xffffffffULL; 313 e->bits |= (u32) val; 314 e->fields.remote_irr = 0; 315 } 316 update_handled_vectors(ioapic); 317 mask_after = e->fields.mask; 318 if (mask_before != mask_after) 319 kvm_fire_mask_notifiers(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index, mask_after); 320 if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG 321 && ioapic->irr & (1 << index)) 322 ioapic_service(ioapic, index, false); 323 kvm_vcpu_request_scan_ioapic(ioapic->kvm); 324 break; 325 } 326 } 327 328 static int ioapic_service(struct kvm_ioapic *ioapic, int irq, bool line_status) 329 { 330 union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq]; 331 struct kvm_lapic_irq irqe; 332 int ret; 333 334 if (entry->fields.mask) 335 return -1; 336 337 ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x " 338 "vector=%x trig_mode=%x\n", 339 entry->fields.dest_id, entry->fields.dest_mode, 340 entry->fields.delivery_mode, entry->fields.vector, 341 entry->fields.trig_mode); 342 343 irqe.dest_id = entry->fields.dest_id; 344 irqe.vector = entry->fields.vector; 345 irqe.dest_mode = entry->fields.dest_mode; 346 irqe.trig_mode = entry->fields.trig_mode; 347 irqe.delivery_mode = entry->fields.delivery_mode << 8; 348 irqe.level = 1; 349 irqe.shorthand = 0; 350 351 if (irqe.trig_mode == IOAPIC_EDGE_TRIG) 352 ioapic->irr &= ~(1 << irq); 353 354 if (irq == RTC_GSI && line_status) { 355 /* 356 * pending_eoi cannot ever become negative (see 357 * rtc_status_pending_eoi_check_valid) and the caller 358 * ensures that it is only called if it is >= zero, namely 359 * if rtc_irq_check_coalesced returns false). 360 */ 361 BUG_ON(ioapic->rtc_status.pending_eoi != 0); 362 ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, 363 ioapic->rtc_status.dest_map); 364 ioapic->rtc_status.pending_eoi = (ret < 0 ? 0 : ret); 365 } else 366 ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, NULL); 367 368 if (ret && irqe.trig_mode == IOAPIC_LEVEL_TRIG) 369 entry->fields.remote_irr = 1; 370 371 return ret; 372 } 373 374 int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id, 375 int level, bool line_status) 376 { 377 int ret, irq_level; 378 379 BUG_ON(irq < 0 || irq >= IOAPIC_NUM_PINS); 380 381 spin_lock(&ioapic->lock); 382 irq_level = __kvm_irq_line_state(&ioapic->irq_states[irq], 383 irq_source_id, level); 384 ret = ioapic_set_irq(ioapic, irq, irq_level, line_status); 385 386 spin_unlock(&ioapic->lock); 387 388 return ret; 389 } 390 391 void kvm_ioapic_clear_all(struct kvm_ioapic *ioapic, int irq_source_id) 392 { 393 int i; 394 395 spin_lock(&ioapic->lock); 396 for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++) 397 __clear_bit(irq_source_id, &ioapic->irq_states[i]); 398 spin_unlock(&ioapic->lock); 399 } 400 401 static void kvm_ioapic_eoi_inject_work(struct work_struct *work) 402 { 403 int i; 404 struct kvm_ioapic *ioapic = container_of(work, struct kvm_ioapic, 405 eoi_inject.work); 406 spin_lock(&ioapic->lock); 407 for (i = 0; i < IOAPIC_NUM_PINS; i++) { 408 union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i]; 409 410 if (ent->fields.trig_mode != IOAPIC_LEVEL_TRIG) 411 continue; 412 413 if (ioapic->irr & (1 << i) && !ent->fields.remote_irr) 414 ioapic_service(ioapic, i, false); 415 } 416 spin_unlock(&ioapic->lock); 417 } 418 419 #define IOAPIC_SUCCESSIVE_IRQ_MAX_COUNT 10000 420 421 static void __kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu, 422 struct kvm_ioapic *ioapic, int vector, int trigger_mode) 423 { 424 int i; 425 426 for (i = 0; i < IOAPIC_NUM_PINS; i++) { 427 union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i]; 428 429 if (ent->fields.vector != vector) 430 continue; 431 432 if (i == RTC_GSI) 433 rtc_irq_eoi(ioapic, vcpu); 434 /* 435 * We are dropping lock while calling ack notifiers because ack 436 * notifier callbacks for assigned devices call into IOAPIC 437 * recursively. Since remote_irr is cleared only after call 438 * to notifiers if the same vector will be delivered while lock 439 * is dropped it will be put into irr and will be delivered 440 * after ack notifier returns. 441 */ 442 spin_unlock(&ioapic->lock); 443 kvm_notify_acked_irq(ioapic->kvm, KVM_IRQCHIP_IOAPIC, i); 444 spin_lock(&ioapic->lock); 445 446 if (trigger_mode != IOAPIC_LEVEL_TRIG) 447 continue; 448 449 ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG); 450 ent->fields.remote_irr = 0; 451 if (!ent->fields.mask && (ioapic->irr & (1 << i))) { 452 ++ioapic->irq_eoi[i]; 453 if (ioapic->irq_eoi[i] == IOAPIC_SUCCESSIVE_IRQ_MAX_COUNT) { 454 /* 455 * Real hardware does not deliver the interrupt 456 * immediately during eoi broadcast, and this 457 * lets a buggy guest make slow progress 458 * even if it does not correctly handle a 459 * level-triggered interrupt. Emulate this 460 * behavior if we detect an interrupt storm. 461 */ 462 schedule_delayed_work(&ioapic->eoi_inject, HZ / 100); 463 ioapic->irq_eoi[i] = 0; 464 trace_kvm_ioapic_delayed_eoi_inj(ent->bits); 465 } else { 466 ioapic_service(ioapic, i, false); 467 } 468 } else { 469 ioapic->irq_eoi[i] = 0; 470 } 471 } 472 } 473 474 bool kvm_ioapic_handles_vector(struct kvm *kvm, int vector) 475 { 476 struct kvm_ioapic *ioapic = kvm->arch.vioapic; 477 smp_rmb(); 478 return test_bit(vector, ioapic->handled_vectors); 479 } 480 481 void kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu, int vector, int trigger_mode) 482 { 483 struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic; 484 485 spin_lock(&ioapic->lock); 486 __kvm_ioapic_update_eoi(vcpu, ioapic, vector, trigger_mode); 487 spin_unlock(&ioapic->lock); 488 } 489 490 static inline struct kvm_ioapic *to_ioapic(struct kvm_io_device *dev) 491 { 492 return container_of(dev, struct kvm_ioapic, dev); 493 } 494 495 static inline int ioapic_in_range(struct kvm_ioapic *ioapic, gpa_t addr) 496 { 497 return ((addr >= ioapic->base_address && 498 (addr < ioapic->base_address + IOAPIC_MEM_LENGTH))); 499 } 500 501 static int ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len, 502 void *val) 503 { 504 struct kvm_ioapic *ioapic = to_ioapic(this); 505 u32 result; 506 if (!ioapic_in_range(ioapic, addr)) 507 return -EOPNOTSUPP; 508 509 ioapic_debug("addr %lx\n", (unsigned long)addr); 510 ASSERT(!(addr & 0xf)); /* check alignment */ 511 512 addr &= 0xff; 513 spin_lock(&ioapic->lock); 514 switch (addr) { 515 case IOAPIC_REG_SELECT: 516 result = ioapic->ioregsel; 517 break; 518 519 case IOAPIC_REG_WINDOW: 520 result = ioapic_read_indirect(ioapic, addr, len); 521 break; 522 523 default: 524 result = 0; 525 break; 526 } 527 spin_unlock(&ioapic->lock); 528 529 switch (len) { 530 case 8: 531 *(u64 *) val = result; 532 break; 533 case 1: 534 case 2: 535 case 4: 536 memcpy(val, (char *)&result, len); 537 break; 538 default: 539 printk(KERN_WARNING "ioapic: wrong length %d\n", len); 540 } 541 return 0; 542 } 543 544 static int ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len, 545 const void *val) 546 { 547 struct kvm_ioapic *ioapic = to_ioapic(this); 548 u32 data; 549 if (!ioapic_in_range(ioapic, addr)) 550 return -EOPNOTSUPP; 551 552 ioapic_debug("ioapic_mmio_write addr=%p len=%d val=%p\n", 553 (void*)addr, len, val); 554 ASSERT(!(addr & 0xf)); /* check alignment */ 555 556 switch (len) { 557 case 8: 558 case 4: 559 data = *(u32 *) val; 560 break; 561 case 2: 562 data = *(u16 *) val; 563 break; 564 case 1: 565 data = *(u8 *) val; 566 break; 567 default: 568 printk(KERN_WARNING "ioapic: Unsupported size %d\n", len); 569 return 0; 570 } 571 572 addr &= 0xff; 573 spin_lock(&ioapic->lock); 574 switch (addr) { 575 case IOAPIC_REG_SELECT: 576 ioapic->ioregsel = data & 0xFF; /* 8-bit register */ 577 break; 578 579 case IOAPIC_REG_WINDOW: 580 ioapic_write_indirect(ioapic, data); 581 break; 582 583 default: 584 break; 585 } 586 spin_unlock(&ioapic->lock); 587 return 0; 588 } 589 590 static void kvm_ioapic_reset(struct kvm_ioapic *ioapic) 591 { 592 int i; 593 594 cancel_delayed_work_sync(&ioapic->eoi_inject); 595 for (i = 0; i < IOAPIC_NUM_PINS; i++) 596 ioapic->redirtbl[i].fields.mask = 1; 597 ioapic->base_address = IOAPIC_DEFAULT_BASE_ADDRESS; 598 ioapic->ioregsel = 0; 599 ioapic->irr = 0; 600 ioapic->id = 0; 601 memset(ioapic->irq_eoi, 0x00, IOAPIC_NUM_PINS); 602 rtc_irq_eoi_tracking_reset(ioapic); 603 update_handled_vectors(ioapic); 604 } 605 606 static const struct kvm_io_device_ops ioapic_mmio_ops = { 607 .read = ioapic_mmio_read, 608 .write = ioapic_mmio_write, 609 }; 610 611 int kvm_ioapic_init(struct kvm *kvm) 612 { 613 struct kvm_ioapic *ioapic; 614 int ret; 615 616 ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL); 617 if (!ioapic) 618 return -ENOMEM; 619 spin_lock_init(&ioapic->lock); 620 INIT_DELAYED_WORK(&ioapic->eoi_inject, kvm_ioapic_eoi_inject_work); 621 kvm->arch.vioapic = ioapic; 622 kvm_ioapic_reset(ioapic); 623 kvm_iodevice_init(&ioapic->dev, &ioapic_mmio_ops); 624 ioapic->kvm = kvm; 625 mutex_lock(&kvm->slots_lock); 626 ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, ioapic->base_address, 627 IOAPIC_MEM_LENGTH, &ioapic->dev); 628 mutex_unlock(&kvm->slots_lock); 629 if (ret < 0) { 630 kvm->arch.vioapic = NULL; 631 kfree(ioapic); 632 } 633 634 return ret; 635 } 636 637 void kvm_ioapic_destroy(struct kvm *kvm) 638 { 639 struct kvm_ioapic *ioapic = kvm->arch.vioapic; 640 641 cancel_delayed_work_sync(&ioapic->eoi_inject); 642 if (ioapic) { 643 kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, &ioapic->dev); 644 kvm->arch.vioapic = NULL; 645 kfree(ioapic); 646 } 647 } 648 649 int kvm_get_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state) 650 { 651 struct kvm_ioapic *ioapic = ioapic_irqchip(kvm); 652 if (!ioapic) 653 return -EINVAL; 654 655 spin_lock(&ioapic->lock); 656 memcpy(state, ioapic, sizeof(struct kvm_ioapic_state)); 657 spin_unlock(&ioapic->lock); 658 return 0; 659 } 660 661 int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state) 662 { 663 struct kvm_ioapic *ioapic = ioapic_irqchip(kvm); 664 if (!ioapic) 665 return -EINVAL; 666 667 spin_lock(&ioapic->lock); 668 memcpy(ioapic, state, sizeof(struct kvm_ioapic_state)); 669 ioapic->irr = 0; 670 update_handled_vectors(ioapic); 671 kvm_vcpu_request_scan_ioapic(kvm); 672 kvm_ioapic_inject_all(ioapic, state->irr); 673 spin_unlock(&ioapic->lock); 674 return 0; 675 } 676