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