1 /* 2 * interrupt.c - handling kvm guest interrupts 3 * 4 * Copyright IBM Corp. 2008 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License (version 2 only) 8 * as published by the Free Software Foundation. 9 * 10 * Author(s): Carsten Otte <cotte@de.ibm.com> 11 */ 12 13 #include <asm/lowcore.h> 14 #include <asm/uaccess.h> 15 #include <linux/hrtimer.h> 16 #include <linux/interrupt.h> 17 #include <linux/kvm_host.h> 18 #include <linux/signal.h> 19 #include "kvm-s390.h" 20 #include "gaccess.h" 21 22 static int psw_extint_disabled(struct kvm_vcpu *vcpu) 23 { 24 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT); 25 } 26 27 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu) 28 { 29 if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) || 30 (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) || 31 (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT)) 32 return 0; 33 return 1; 34 } 35 36 static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu, 37 struct kvm_s390_interrupt_info *inti) 38 { 39 switch (inti->type) { 40 case KVM_S390_INT_EMERGENCY: 41 if (psw_extint_disabled(vcpu)) 42 return 0; 43 if (vcpu->arch.sie_block->gcr[0] & 0x4000ul) 44 return 1; 45 return 0; 46 case KVM_S390_INT_SERVICE: 47 if (psw_extint_disabled(vcpu)) 48 return 0; 49 if (vcpu->arch.sie_block->gcr[0] & 0x200ul) 50 return 1; 51 return 0; 52 case KVM_S390_INT_VIRTIO: 53 if (psw_extint_disabled(vcpu)) 54 return 0; 55 if (vcpu->arch.sie_block->gcr[0] & 0x200ul) 56 return 1; 57 return 0; 58 case KVM_S390_PROGRAM_INT: 59 case KVM_S390_SIGP_STOP: 60 case KVM_S390_SIGP_SET_PREFIX: 61 case KVM_S390_RESTART: 62 return 1; 63 default: 64 BUG(); 65 } 66 return 0; 67 } 68 69 static void __set_cpu_idle(struct kvm_vcpu *vcpu) 70 { 71 BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1); 72 atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags); 73 set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask); 74 } 75 76 static void __unset_cpu_idle(struct kvm_vcpu *vcpu) 77 { 78 BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1); 79 atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags); 80 clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask); 81 } 82 83 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu) 84 { 85 atomic_clear_mask(CPUSTAT_ECALL_PEND | 86 CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT, 87 &vcpu->arch.sie_block->cpuflags); 88 vcpu->arch.sie_block->lctl = 0x0000; 89 } 90 91 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag) 92 { 93 atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags); 94 } 95 96 static void __set_intercept_indicator(struct kvm_vcpu *vcpu, 97 struct kvm_s390_interrupt_info *inti) 98 { 99 switch (inti->type) { 100 case KVM_S390_INT_EMERGENCY: 101 case KVM_S390_INT_SERVICE: 102 case KVM_S390_INT_VIRTIO: 103 if (psw_extint_disabled(vcpu)) 104 __set_cpuflag(vcpu, CPUSTAT_EXT_INT); 105 else 106 vcpu->arch.sie_block->lctl |= LCTL_CR0; 107 break; 108 case KVM_S390_SIGP_STOP: 109 __set_cpuflag(vcpu, CPUSTAT_STOP_INT); 110 break; 111 default: 112 BUG(); 113 } 114 } 115 116 static void __do_deliver_interrupt(struct kvm_vcpu *vcpu, 117 struct kvm_s390_interrupt_info *inti) 118 { 119 const unsigned short table[] = { 2, 4, 4, 6 }; 120 int rc, exception = 0; 121 122 switch (inti->type) { 123 case KVM_S390_INT_EMERGENCY: 124 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg"); 125 vcpu->stat.deliver_emergency_signal++; 126 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1201); 127 if (rc == -EFAULT) 128 exception = 1; 129 130 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW, 131 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 132 if (rc == -EFAULT) 133 exception = 1; 134 135 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw, 136 __LC_EXT_NEW_PSW, sizeof(psw_t)); 137 if (rc == -EFAULT) 138 exception = 1; 139 break; 140 141 case KVM_S390_INT_SERVICE: 142 VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x", 143 inti->ext.ext_params); 144 vcpu->stat.deliver_service_signal++; 145 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2401); 146 if (rc == -EFAULT) 147 exception = 1; 148 149 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW, 150 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 151 if (rc == -EFAULT) 152 exception = 1; 153 154 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw, 155 __LC_EXT_NEW_PSW, sizeof(psw_t)); 156 if (rc == -EFAULT) 157 exception = 1; 158 159 rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params); 160 if (rc == -EFAULT) 161 exception = 1; 162 break; 163 164 case KVM_S390_INT_VIRTIO: 165 VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx", 166 inti->ext.ext_params, inti->ext.ext_params2); 167 vcpu->stat.deliver_virtio_interrupt++; 168 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2603); 169 if (rc == -EFAULT) 170 exception = 1; 171 172 rc = put_guest_u16(vcpu, __LC_CPU_ADDRESS, 0x0d00); 173 if (rc == -EFAULT) 174 exception = 1; 175 176 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW, 177 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 178 if (rc == -EFAULT) 179 exception = 1; 180 181 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw, 182 __LC_EXT_NEW_PSW, sizeof(psw_t)); 183 if (rc == -EFAULT) 184 exception = 1; 185 186 rc = put_guest_u32(vcpu, __LC_EXT_PARAMS, inti->ext.ext_params); 187 if (rc == -EFAULT) 188 exception = 1; 189 190 rc = put_guest_u64(vcpu, __LC_PFAULT_INTPARM, 191 inti->ext.ext_params2); 192 if (rc == -EFAULT) 193 exception = 1; 194 break; 195 196 case KVM_S390_SIGP_STOP: 197 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop"); 198 vcpu->stat.deliver_stop_signal++; 199 __set_intercept_indicator(vcpu, inti); 200 break; 201 202 case KVM_S390_SIGP_SET_PREFIX: 203 VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x", 204 inti->prefix.address); 205 vcpu->stat.deliver_prefix_signal++; 206 vcpu->arch.sie_block->prefix = inti->prefix.address; 207 vcpu->arch.sie_block->ihcpu = 0xffff; 208 break; 209 210 case KVM_S390_RESTART: 211 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart"); 212 vcpu->stat.deliver_restart_signal++; 213 rc = copy_to_guest(vcpu, offsetof(struct _lowcore, 214 restart_old_psw), &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 215 if (rc == -EFAULT) 216 exception = 1; 217 218 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw, 219 offsetof(struct _lowcore, restart_psw), sizeof(psw_t)); 220 if (rc == -EFAULT) 221 exception = 1; 222 break; 223 224 case KVM_S390_PROGRAM_INT: 225 VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x", 226 inti->pgm.code, 227 table[vcpu->arch.sie_block->ipa >> 14]); 228 vcpu->stat.deliver_program_int++; 229 rc = put_guest_u16(vcpu, __LC_PGM_INT_CODE, inti->pgm.code); 230 if (rc == -EFAULT) 231 exception = 1; 232 233 rc = put_guest_u16(vcpu, __LC_PGM_ILC, 234 table[vcpu->arch.sie_block->ipa >> 14]); 235 if (rc == -EFAULT) 236 exception = 1; 237 238 rc = copy_to_guest(vcpu, __LC_PGM_OLD_PSW, 239 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 240 if (rc == -EFAULT) 241 exception = 1; 242 243 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw, 244 __LC_PGM_NEW_PSW, sizeof(psw_t)); 245 if (rc == -EFAULT) 246 exception = 1; 247 break; 248 249 default: 250 BUG(); 251 } 252 if (exception) { 253 printk("kvm: The guest lowcore is not mapped during interrupt " 254 "delivery, killing userspace\n"); 255 do_exit(SIGKILL); 256 } 257 } 258 259 static int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu) 260 { 261 int rc, exception = 0; 262 263 if (psw_extint_disabled(vcpu)) 264 return 0; 265 if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul)) 266 return 0; 267 rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1004); 268 if (rc == -EFAULT) 269 exception = 1; 270 rc = copy_to_guest(vcpu, __LC_EXT_OLD_PSW, 271 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 272 if (rc == -EFAULT) 273 exception = 1; 274 rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw, 275 __LC_EXT_NEW_PSW, sizeof(psw_t)); 276 if (rc == -EFAULT) 277 exception = 1; 278 if (exception) { 279 printk("kvm: The guest lowcore is not mapped during interrupt " 280 "delivery, killing userspace\n"); 281 do_exit(SIGKILL); 282 } 283 return 1; 284 } 285 286 int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu) 287 { 288 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 289 struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int; 290 struct kvm_s390_interrupt_info *inti; 291 int rc = 0; 292 293 if (atomic_read(&li->active)) { 294 spin_lock_bh(&li->lock); 295 list_for_each_entry(inti, &li->list, list) 296 if (__interrupt_is_deliverable(vcpu, inti)) { 297 rc = 1; 298 break; 299 } 300 spin_unlock_bh(&li->lock); 301 } 302 303 if ((!rc) && atomic_read(&fi->active)) { 304 spin_lock(&fi->lock); 305 list_for_each_entry(inti, &fi->list, list) 306 if (__interrupt_is_deliverable(vcpu, inti)) { 307 rc = 1; 308 break; 309 } 310 spin_unlock(&fi->lock); 311 } 312 313 if ((!rc) && (vcpu->arch.sie_block->ckc < 314 get_clock() + vcpu->arch.sie_block->epoch)) { 315 if ((!psw_extint_disabled(vcpu)) && 316 (vcpu->arch.sie_block->gcr[0] & 0x800ul)) 317 rc = 1; 318 } 319 320 return rc; 321 } 322 323 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu) 324 { 325 /* do real check here */ 326 return 1; 327 } 328 329 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) 330 { 331 return 0; 332 } 333 334 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu) 335 { 336 u64 now, sltime; 337 DECLARE_WAITQUEUE(wait, current); 338 339 vcpu->stat.exit_wait_state++; 340 if (kvm_cpu_has_interrupt(vcpu)) 341 return 0; 342 343 __set_cpu_idle(vcpu); 344 spin_lock_bh(&vcpu->arch.local_int.lock); 345 vcpu->arch.local_int.timer_due = 0; 346 spin_unlock_bh(&vcpu->arch.local_int.lock); 347 348 if (psw_interrupts_disabled(vcpu)) { 349 VCPU_EVENT(vcpu, 3, "%s", "disabled wait"); 350 __unset_cpu_idle(vcpu); 351 return -ENOTSUPP; /* disabled wait */ 352 } 353 354 if (psw_extint_disabled(vcpu) || 355 (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))) { 356 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer"); 357 goto no_timer; 358 } 359 360 now = get_clock() + vcpu->arch.sie_block->epoch; 361 if (vcpu->arch.sie_block->ckc < now) { 362 __unset_cpu_idle(vcpu); 363 return 0; 364 } 365 366 sltime = ((vcpu->arch.sie_block->ckc - now)*125)>>9; 367 368 hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL); 369 VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime); 370 no_timer: 371 spin_lock(&vcpu->arch.local_int.float_int->lock); 372 spin_lock_bh(&vcpu->arch.local_int.lock); 373 add_wait_queue(&vcpu->arch.local_int.wq, &wait); 374 while (list_empty(&vcpu->arch.local_int.list) && 375 list_empty(&vcpu->arch.local_int.float_int->list) && 376 (!vcpu->arch.local_int.timer_due) && 377 !signal_pending(current)) { 378 set_current_state(TASK_INTERRUPTIBLE); 379 spin_unlock_bh(&vcpu->arch.local_int.lock); 380 spin_unlock(&vcpu->arch.local_int.float_int->lock); 381 vcpu_put(vcpu); 382 schedule(); 383 vcpu_load(vcpu); 384 spin_lock(&vcpu->arch.local_int.float_int->lock); 385 spin_lock_bh(&vcpu->arch.local_int.lock); 386 } 387 __unset_cpu_idle(vcpu); 388 __set_current_state(TASK_RUNNING); 389 remove_wait_queue(&vcpu->wq, &wait); 390 spin_unlock_bh(&vcpu->arch.local_int.lock); 391 spin_unlock(&vcpu->arch.local_int.float_int->lock); 392 hrtimer_try_to_cancel(&vcpu->arch.ckc_timer); 393 return 0; 394 } 395 396 void kvm_s390_tasklet(unsigned long parm) 397 { 398 struct kvm_vcpu *vcpu = (struct kvm_vcpu *) parm; 399 400 spin_lock(&vcpu->arch.local_int.lock); 401 vcpu->arch.local_int.timer_due = 1; 402 if (waitqueue_active(&vcpu->arch.local_int.wq)) 403 wake_up_interruptible(&vcpu->arch.local_int.wq); 404 spin_unlock(&vcpu->arch.local_int.lock); 405 } 406 407 /* 408 * low level hrtimer wake routine. Because this runs in hardirq context 409 * we schedule a tasklet to do the real work. 410 */ 411 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer) 412 { 413 struct kvm_vcpu *vcpu; 414 415 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer); 416 tasklet_schedule(&vcpu->arch.tasklet); 417 418 return HRTIMER_NORESTART; 419 } 420 421 void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu) 422 { 423 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 424 struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int; 425 struct kvm_s390_interrupt_info *n, *inti = NULL; 426 int deliver; 427 428 __reset_intercept_indicators(vcpu); 429 if (atomic_read(&li->active)) { 430 do { 431 deliver = 0; 432 spin_lock_bh(&li->lock); 433 list_for_each_entry_safe(inti, n, &li->list, list) { 434 if (__interrupt_is_deliverable(vcpu, inti)) { 435 list_del(&inti->list); 436 deliver = 1; 437 break; 438 } 439 __set_intercept_indicator(vcpu, inti); 440 } 441 if (list_empty(&li->list)) 442 atomic_set(&li->active, 0); 443 spin_unlock_bh(&li->lock); 444 if (deliver) { 445 __do_deliver_interrupt(vcpu, inti); 446 kfree(inti); 447 } 448 } while (deliver); 449 } 450 451 if ((vcpu->arch.sie_block->ckc < 452 get_clock() + vcpu->arch.sie_block->epoch)) 453 __try_deliver_ckc_interrupt(vcpu); 454 455 if (atomic_read(&fi->active)) { 456 do { 457 deliver = 0; 458 spin_lock(&fi->lock); 459 list_for_each_entry_safe(inti, n, &fi->list, list) { 460 if (__interrupt_is_deliverable(vcpu, inti)) { 461 list_del(&inti->list); 462 deliver = 1; 463 break; 464 } 465 __set_intercept_indicator(vcpu, inti); 466 } 467 if (list_empty(&fi->list)) 468 atomic_set(&fi->active, 0); 469 spin_unlock(&fi->lock); 470 if (deliver) { 471 __do_deliver_interrupt(vcpu, inti); 472 kfree(inti); 473 } 474 } while (deliver); 475 } 476 } 477 478 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code) 479 { 480 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 481 struct kvm_s390_interrupt_info *inti; 482 483 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 484 if (!inti) 485 return -ENOMEM; 486 487 inti->type = KVM_S390_PROGRAM_INT;; 488 inti->pgm.code = code; 489 490 VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code); 491 spin_lock_bh(&li->lock); 492 list_add(&inti->list, &li->list); 493 atomic_set(&li->active, 1); 494 BUG_ON(waitqueue_active(&li->wq)); 495 spin_unlock_bh(&li->lock); 496 return 0; 497 } 498 499 int kvm_s390_inject_vm(struct kvm *kvm, 500 struct kvm_s390_interrupt *s390int) 501 { 502 struct kvm_s390_local_interrupt *li; 503 struct kvm_s390_float_interrupt *fi; 504 struct kvm_s390_interrupt_info *inti; 505 int sigcpu; 506 507 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 508 if (!inti) 509 return -ENOMEM; 510 511 switch (s390int->type) { 512 case KVM_S390_INT_VIRTIO: 513 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx", 514 s390int->parm, s390int->parm64); 515 inti->type = s390int->type; 516 inti->ext.ext_params = s390int->parm; 517 inti->ext.ext_params2 = s390int->parm64; 518 break; 519 case KVM_S390_INT_SERVICE: 520 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm); 521 inti->type = s390int->type; 522 inti->ext.ext_params = s390int->parm; 523 break; 524 case KVM_S390_PROGRAM_INT: 525 case KVM_S390_SIGP_STOP: 526 case KVM_S390_INT_EMERGENCY: 527 default: 528 kfree(inti); 529 return -EINVAL; 530 } 531 532 mutex_lock(&kvm->lock); 533 fi = &kvm->arch.float_int; 534 spin_lock(&fi->lock); 535 list_add_tail(&inti->list, &fi->list); 536 atomic_set(&fi->active, 1); 537 sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS); 538 if (sigcpu == KVM_MAX_VCPUS) { 539 do { 540 sigcpu = fi->next_rr_cpu++; 541 if (sigcpu == KVM_MAX_VCPUS) 542 sigcpu = fi->next_rr_cpu = 0; 543 } while (fi->local_int[sigcpu] == NULL); 544 } 545 li = fi->local_int[sigcpu]; 546 spin_lock_bh(&li->lock); 547 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); 548 if (waitqueue_active(&li->wq)) 549 wake_up_interruptible(&li->wq); 550 spin_unlock_bh(&li->lock); 551 spin_unlock(&fi->lock); 552 mutex_unlock(&kvm->lock); 553 return 0; 554 } 555 556 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, 557 struct kvm_s390_interrupt *s390int) 558 { 559 struct kvm_s390_local_interrupt *li; 560 struct kvm_s390_interrupt_info *inti; 561 562 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 563 if (!inti) 564 return -ENOMEM; 565 566 switch (s390int->type) { 567 case KVM_S390_PROGRAM_INT: 568 if (s390int->parm & 0xffff0000) { 569 kfree(inti); 570 return -EINVAL; 571 } 572 inti->type = s390int->type; 573 inti->pgm.code = s390int->parm; 574 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)", 575 s390int->parm); 576 break; 577 case KVM_S390_SIGP_SET_PREFIX: 578 inti->prefix.address = s390int->parm; 579 inti->type = s390int->type; 580 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)", 581 s390int->parm); 582 break; 583 case KVM_S390_SIGP_STOP: 584 case KVM_S390_RESTART: 585 case KVM_S390_INT_EMERGENCY: 586 VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type); 587 inti->type = s390int->type; 588 break; 589 case KVM_S390_INT_VIRTIO: 590 case KVM_S390_INT_SERVICE: 591 default: 592 kfree(inti); 593 return -EINVAL; 594 } 595 596 mutex_lock(&vcpu->kvm->lock); 597 li = &vcpu->arch.local_int; 598 spin_lock_bh(&li->lock); 599 if (inti->type == KVM_S390_PROGRAM_INT) 600 list_add(&inti->list, &li->list); 601 else 602 list_add_tail(&inti->list, &li->list); 603 atomic_set(&li->active, 1); 604 if (inti->type == KVM_S390_SIGP_STOP) 605 li->action_bits |= ACTION_STOP_ON_STOP; 606 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); 607 if (waitqueue_active(&li->wq)) 608 wake_up_interruptible(&vcpu->arch.local_int.wq); 609 spin_unlock_bh(&li->lock); 610 mutex_unlock(&vcpu->kvm->lock); 611 return 0; 612 } 613