1 /* 2 * handling kvm guest interrupts 3 * 4 * Copyright IBM Corp. 2008, 2015 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 <linux/interrupt.h> 14 #include <linux/kvm_host.h> 15 #include <linux/hrtimer.h> 16 #include <linux/mmu_context.h> 17 #include <linux/signal.h> 18 #include <linux/slab.h> 19 #include <linux/bitmap.h> 20 #include <linux/vmalloc.h> 21 #include <asm/asm-offsets.h> 22 #include <asm/dis.h> 23 #include <asm/uaccess.h> 24 #include <asm/sclp.h> 25 #include <asm/isc.h> 26 #include "kvm-s390.h" 27 #include "gaccess.h" 28 #include "trace-s390.h" 29 30 #define IOINT_SCHID_MASK 0x0000ffff 31 #define IOINT_SSID_MASK 0x00030000 32 #define IOINT_CSSID_MASK 0x03fc0000 33 #define PFAULT_INIT 0x0600 34 #define PFAULT_DONE 0x0680 35 #define VIRTIO_PARAM 0x0d00 36 37 int psw_extint_disabled(struct kvm_vcpu *vcpu) 38 { 39 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT); 40 } 41 42 static int psw_ioint_disabled(struct kvm_vcpu *vcpu) 43 { 44 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO); 45 } 46 47 static int psw_mchk_disabled(struct kvm_vcpu *vcpu) 48 { 49 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK); 50 } 51 52 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu) 53 { 54 if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) || 55 (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) || 56 (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT)) 57 return 0; 58 return 1; 59 } 60 61 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu) 62 { 63 if (psw_extint_disabled(vcpu) || 64 !(vcpu->arch.sie_block->gcr[0] & 0x800ul)) 65 return 0; 66 if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu)) 67 /* No timer interrupts when single stepping */ 68 return 0; 69 return 1; 70 } 71 72 static int ckc_irq_pending(struct kvm_vcpu *vcpu) 73 { 74 preempt_disable(); 75 if (!(vcpu->arch.sie_block->ckc < 76 get_tod_clock_fast() + vcpu->arch.sie_block->epoch)) { 77 preempt_enable(); 78 return 0; 79 } 80 preempt_enable(); 81 return ckc_interrupts_enabled(vcpu); 82 } 83 84 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu) 85 { 86 return !psw_extint_disabled(vcpu) && 87 (vcpu->arch.sie_block->gcr[0] & 0x400ul); 88 } 89 90 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu) 91 { 92 return (vcpu->arch.sie_block->cputm >> 63) && 93 cpu_timer_interrupts_enabled(vcpu); 94 } 95 96 static inline int is_ioirq(unsigned long irq_type) 97 { 98 return ((irq_type >= IRQ_PEND_IO_ISC_0) && 99 (irq_type <= IRQ_PEND_IO_ISC_7)); 100 } 101 102 static uint64_t isc_to_isc_bits(int isc) 103 { 104 return (0x80 >> isc) << 24; 105 } 106 107 static inline u8 int_word_to_isc(u32 int_word) 108 { 109 return (int_word & 0x38000000) >> 27; 110 } 111 112 static inline unsigned long pending_floating_irqs(struct kvm_vcpu *vcpu) 113 { 114 return vcpu->kvm->arch.float_int.pending_irqs; 115 } 116 117 static inline unsigned long pending_local_irqs(struct kvm_vcpu *vcpu) 118 { 119 return vcpu->arch.local_int.pending_irqs; 120 } 121 122 static unsigned long disable_iscs(struct kvm_vcpu *vcpu, 123 unsigned long active_mask) 124 { 125 int i; 126 127 for (i = 0; i <= MAX_ISC; i++) 128 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i))) 129 active_mask &= ~(1UL << (IRQ_PEND_IO_ISC_0 + i)); 130 131 return active_mask; 132 } 133 134 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu) 135 { 136 unsigned long active_mask; 137 138 active_mask = pending_local_irqs(vcpu); 139 active_mask |= pending_floating_irqs(vcpu); 140 if (!active_mask) 141 return 0; 142 143 if (psw_extint_disabled(vcpu)) 144 active_mask &= ~IRQ_PEND_EXT_MASK; 145 if (psw_ioint_disabled(vcpu)) 146 active_mask &= ~IRQ_PEND_IO_MASK; 147 else 148 active_mask = disable_iscs(vcpu, active_mask); 149 if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul)) 150 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask); 151 if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul)) 152 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask); 153 if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul)) 154 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask); 155 if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul)) 156 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask); 157 if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul)) 158 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask); 159 if (psw_mchk_disabled(vcpu)) 160 active_mask &= ~IRQ_PEND_MCHK_MASK; 161 if (!(vcpu->arch.sie_block->gcr[14] & 162 vcpu->kvm->arch.float_int.mchk.cr14)) 163 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask); 164 165 /* 166 * STOP irqs will never be actively delivered. They are triggered via 167 * intercept requests and cleared when the stop intercept is performed. 168 */ 169 __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask); 170 171 return active_mask; 172 } 173 174 static void __set_cpu_idle(struct kvm_vcpu *vcpu) 175 { 176 atomic_or(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags); 177 set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask); 178 } 179 180 static void __unset_cpu_idle(struct kvm_vcpu *vcpu) 181 { 182 atomic_andnot(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags); 183 clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask); 184 } 185 186 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu) 187 { 188 atomic_andnot(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT, 189 &vcpu->arch.sie_block->cpuflags); 190 vcpu->arch.sie_block->lctl = 0x0000; 191 vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT); 192 193 if (guestdbg_enabled(vcpu)) { 194 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 | 195 LCTL_CR10 | LCTL_CR11); 196 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT); 197 } 198 } 199 200 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag) 201 { 202 atomic_or(flag, &vcpu->arch.sie_block->cpuflags); 203 } 204 205 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu) 206 { 207 if (!(pending_floating_irqs(vcpu) & IRQ_PEND_IO_MASK)) 208 return; 209 else if (psw_ioint_disabled(vcpu)) 210 __set_cpuflag(vcpu, CPUSTAT_IO_INT); 211 else 212 vcpu->arch.sie_block->lctl |= LCTL_CR6; 213 } 214 215 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu) 216 { 217 if (!(pending_local_irqs(vcpu) & IRQ_PEND_EXT_MASK)) 218 return; 219 if (psw_extint_disabled(vcpu)) 220 __set_cpuflag(vcpu, CPUSTAT_EXT_INT); 221 else 222 vcpu->arch.sie_block->lctl |= LCTL_CR0; 223 } 224 225 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu) 226 { 227 if (!(pending_local_irqs(vcpu) & IRQ_PEND_MCHK_MASK)) 228 return; 229 if (psw_mchk_disabled(vcpu)) 230 vcpu->arch.sie_block->ictl |= ICTL_LPSW; 231 else 232 vcpu->arch.sie_block->lctl |= LCTL_CR14; 233 } 234 235 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu) 236 { 237 if (kvm_s390_is_stop_irq_pending(vcpu)) 238 __set_cpuflag(vcpu, CPUSTAT_STOP_INT); 239 } 240 241 /* Set interception request for non-deliverable interrupts */ 242 static void set_intercept_indicators(struct kvm_vcpu *vcpu) 243 { 244 set_intercept_indicators_io(vcpu); 245 set_intercept_indicators_ext(vcpu); 246 set_intercept_indicators_mchk(vcpu); 247 set_intercept_indicators_stop(vcpu); 248 } 249 250 static u16 get_ilc(struct kvm_vcpu *vcpu) 251 { 252 switch (vcpu->arch.sie_block->icptcode) { 253 case ICPT_INST: 254 case ICPT_INSTPROGI: 255 case ICPT_OPEREXC: 256 case ICPT_PARTEXEC: 257 case ICPT_IOINST: 258 /* last instruction only stored for these icptcodes */ 259 return insn_length(vcpu->arch.sie_block->ipa >> 8); 260 case ICPT_PROGI: 261 return vcpu->arch.sie_block->pgmilc; 262 default: 263 return 0; 264 } 265 } 266 267 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu) 268 { 269 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 270 int rc; 271 272 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER, 273 0, 0); 274 275 rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER, 276 (u16 *)__LC_EXT_INT_CODE); 277 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR); 278 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 279 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 280 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 281 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 282 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs); 283 return rc ? -EFAULT : 0; 284 } 285 286 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu) 287 { 288 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 289 int rc; 290 291 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP, 292 0, 0); 293 294 rc = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP, 295 (u16 __user *)__LC_EXT_INT_CODE); 296 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR); 297 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 298 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 299 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 300 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 301 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs); 302 return rc ? -EFAULT : 0; 303 } 304 305 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu) 306 { 307 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 308 struct kvm_s390_ext_info ext; 309 int rc; 310 311 spin_lock(&li->lock); 312 ext = li->irq.ext; 313 clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs); 314 li->irq.ext.ext_params2 = 0; 315 spin_unlock(&li->lock); 316 317 VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx", 318 ext.ext_params2); 319 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, 320 KVM_S390_INT_PFAULT_INIT, 321 0, ext.ext_params2); 322 323 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE); 324 rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR); 325 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 326 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 327 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 328 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 329 rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2); 330 return rc ? -EFAULT : 0; 331 } 332 333 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu) 334 { 335 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 336 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 337 struct kvm_s390_mchk_info mchk = {}; 338 unsigned long adtl_status_addr; 339 int deliver = 0; 340 int rc = 0; 341 342 spin_lock(&fi->lock); 343 spin_lock(&li->lock); 344 if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) || 345 test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) { 346 /* 347 * If there was an exigent machine check pending, then any 348 * repressible machine checks that might have been pending 349 * are indicated along with it, so always clear bits for 350 * repressible and exigent interrupts 351 */ 352 mchk = li->irq.mchk; 353 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs); 354 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs); 355 memset(&li->irq.mchk, 0, sizeof(mchk)); 356 deliver = 1; 357 } 358 /* 359 * We indicate floating repressible conditions along with 360 * other pending conditions. Channel Report Pending and Channel 361 * Subsystem damage are the only two and and are indicated by 362 * bits in mcic and masked in cr14. 363 */ 364 if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) { 365 mchk.mcic |= fi->mchk.mcic; 366 mchk.cr14 |= fi->mchk.cr14; 367 memset(&fi->mchk, 0, sizeof(mchk)); 368 deliver = 1; 369 } 370 spin_unlock(&li->lock); 371 spin_unlock(&fi->lock); 372 373 if (deliver) { 374 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx", 375 mchk.mcic); 376 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, 377 KVM_S390_MCHK, 378 mchk.cr14, mchk.mcic); 379 380 rc = kvm_s390_vcpu_store_status(vcpu, 381 KVM_S390_STORE_STATUS_PREFIXED); 382 rc |= read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR, 383 &adtl_status_addr, 384 sizeof(unsigned long)); 385 rc |= kvm_s390_vcpu_store_adtl_status(vcpu, 386 adtl_status_addr); 387 rc |= put_guest_lc(vcpu, mchk.mcic, 388 (u64 __user *) __LC_MCCK_CODE); 389 rc |= put_guest_lc(vcpu, mchk.failing_storage_address, 390 (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR); 391 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA, 392 &mchk.fixed_logout, 393 sizeof(mchk.fixed_logout)); 394 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW, 395 &vcpu->arch.sie_block->gpsw, 396 sizeof(psw_t)); 397 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW, 398 &vcpu->arch.sie_block->gpsw, 399 sizeof(psw_t)); 400 } 401 return rc ? -EFAULT : 0; 402 } 403 404 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu) 405 { 406 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 407 int rc; 408 409 VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart"); 410 vcpu->stat.deliver_restart_signal++; 411 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0); 412 413 rc = write_guest_lc(vcpu, 414 offsetof(struct _lowcore, restart_old_psw), 415 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 416 rc |= read_guest_lc(vcpu, offsetof(struct _lowcore, restart_psw), 417 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 418 clear_bit(IRQ_PEND_RESTART, &li->pending_irqs); 419 return rc ? -EFAULT : 0; 420 } 421 422 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu) 423 { 424 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 425 struct kvm_s390_prefix_info prefix; 426 427 spin_lock(&li->lock); 428 prefix = li->irq.prefix; 429 li->irq.prefix.address = 0; 430 clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs); 431 spin_unlock(&li->lock); 432 433 vcpu->stat.deliver_prefix_signal++; 434 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, 435 KVM_S390_SIGP_SET_PREFIX, 436 prefix.address, 0); 437 438 kvm_s390_set_prefix(vcpu, prefix.address); 439 return 0; 440 } 441 442 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu) 443 { 444 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 445 int rc; 446 int cpu_addr; 447 448 spin_lock(&li->lock); 449 cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS); 450 clear_bit(cpu_addr, li->sigp_emerg_pending); 451 if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS)) 452 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs); 453 spin_unlock(&li->lock); 454 455 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg"); 456 vcpu->stat.deliver_emergency_signal++; 457 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY, 458 cpu_addr, 0); 459 460 rc = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG, 461 (u16 *)__LC_EXT_INT_CODE); 462 rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR); 463 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 464 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 465 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 466 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 467 return rc ? -EFAULT : 0; 468 } 469 470 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu) 471 { 472 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 473 struct kvm_s390_extcall_info extcall; 474 int rc; 475 476 spin_lock(&li->lock); 477 extcall = li->irq.extcall; 478 li->irq.extcall.code = 0; 479 clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs); 480 spin_unlock(&li->lock); 481 482 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call"); 483 vcpu->stat.deliver_external_call++; 484 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, 485 KVM_S390_INT_EXTERNAL_CALL, 486 extcall.code, 0); 487 488 rc = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL, 489 (u16 *)__LC_EXT_INT_CODE); 490 rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR); 491 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 492 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 493 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw, 494 sizeof(psw_t)); 495 return rc ? -EFAULT : 0; 496 } 497 498 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu) 499 { 500 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 501 struct kvm_s390_pgm_info pgm_info; 502 int rc = 0, nullifying = false; 503 u16 ilc = get_ilc(vcpu); 504 505 spin_lock(&li->lock); 506 pgm_info = li->irq.pgm; 507 clear_bit(IRQ_PEND_PROG, &li->pending_irqs); 508 memset(&li->irq.pgm, 0, sizeof(pgm_info)); 509 spin_unlock(&li->lock); 510 511 VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilc:%d", 512 pgm_info.code, ilc); 513 vcpu->stat.deliver_program_int++; 514 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT, 515 pgm_info.code, 0); 516 517 switch (pgm_info.code & ~PGM_PER) { 518 case PGM_AFX_TRANSLATION: 519 case PGM_ASX_TRANSLATION: 520 case PGM_EX_TRANSLATION: 521 case PGM_LFX_TRANSLATION: 522 case PGM_LSTE_SEQUENCE: 523 case PGM_LSX_TRANSLATION: 524 case PGM_LX_TRANSLATION: 525 case PGM_PRIMARY_AUTHORITY: 526 case PGM_SECONDARY_AUTHORITY: 527 nullifying = true; 528 /* fall through */ 529 case PGM_SPACE_SWITCH: 530 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code, 531 (u64 *)__LC_TRANS_EXC_CODE); 532 break; 533 case PGM_ALEN_TRANSLATION: 534 case PGM_ALE_SEQUENCE: 535 case PGM_ASTE_INSTANCE: 536 case PGM_ASTE_SEQUENCE: 537 case PGM_ASTE_VALIDITY: 538 case PGM_EXTENDED_AUTHORITY: 539 rc = put_guest_lc(vcpu, pgm_info.exc_access_id, 540 (u8 *)__LC_EXC_ACCESS_ID); 541 nullifying = true; 542 break; 543 case PGM_ASCE_TYPE: 544 case PGM_PAGE_TRANSLATION: 545 case PGM_REGION_FIRST_TRANS: 546 case PGM_REGION_SECOND_TRANS: 547 case PGM_REGION_THIRD_TRANS: 548 case PGM_SEGMENT_TRANSLATION: 549 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code, 550 (u64 *)__LC_TRANS_EXC_CODE); 551 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id, 552 (u8 *)__LC_EXC_ACCESS_ID); 553 rc |= put_guest_lc(vcpu, pgm_info.op_access_id, 554 (u8 *)__LC_OP_ACCESS_ID); 555 nullifying = true; 556 break; 557 case PGM_MONITOR: 558 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr, 559 (u16 *)__LC_MON_CLASS_NR); 560 rc |= put_guest_lc(vcpu, pgm_info.mon_code, 561 (u64 *)__LC_MON_CODE); 562 break; 563 case PGM_VECTOR_PROCESSING: 564 case PGM_DATA: 565 rc = put_guest_lc(vcpu, pgm_info.data_exc_code, 566 (u32 *)__LC_DATA_EXC_CODE); 567 break; 568 case PGM_PROTECTION: 569 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code, 570 (u64 *)__LC_TRANS_EXC_CODE); 571 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id, 572 (u8 *)__LC_EXC_ACCESS_ID); 573 break; 574 case PGM_STACK_FULL: 575 case PGM_STACK_EMPTY: 576 case PGM_STACK_SPECIFICATION: 577 case PGM_STACK_TYPE: 578 case PGM_STACK_OPERATION: 579 case PGM_TRACE_TABEL: 580 case PGM_CRYPTO_OPERATION: 581 nullifying = true; 582 break; 583 } 584 585 if (pgm_info.code & PGM_PER) { 586 rc |= put_guest_lc(vcpu, pgm_info.per_code, 587 (u8 *) __LC_PER_CODE); 588 rc |= put_guest_lc(vcpu, pgm_info.per_atmid, 589 (u8 *)__LC_PER_ATMID); 590 rc |= put_guest_lc(vcpu, pgm_info.per_address, 591 (u64 *) __LC_PER_ADDRESS); 592 rc |= put_guest_lc(vcpu, pgm_info.per_access_id, 593 (u8 *) __LC_PER_ACCESS_ID); 594 } 595 596 if (nullifying && vcpu->arch.sie_block->icptcode == ICPT_INST) 597 kvm_s390_rewind_psw(vcpu, ilc); 598 599 rc |= put_guest_lc(vcpu, ilc, (u16 *) __LC_PGM_ILC); 600 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea, 601 (u64 *) __LC_LAST_BREAK); 602 rc |= put_guest_lc(vcpu, pgm_info.code, 603 (u16 *)__LC_PGM_INT_CODE); 604 rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW, 605 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 606 rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW, 607 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 608 return rc ? -EFAULT : 0; 609 } 610 611 static int __must_check __deliver_service(struct kvm_vcpu *vcpu) 612 { 613 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 614 struct kvm_s390_ext_info ext; 615 int rc = 0; 616 617 spin_lock(&fi->lock); 618 if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) { 619 spin_unlock(&fi->lock); 620 return 0; 621 } 622 ext = fi->srv_signal; 623 memset(&fi->srv_signal, 0, sizeof(ext)); 624 clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs); 625 spin_unlock(&fi->lock); 626 627 VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x", 628 ext.ext_params); 629 vcpu->stat.deliver_service_signal++; 630 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE, 631 ext.ext_params, 0); 632 633 rc = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE); 634 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR); 635 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 636 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 637 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 638 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 639 rc |= put_guest_lc(vcpu, ext.ext_params, 640 (u32 *)__LC_EXT_PARAMS); 641 642 return rc ? -EFAULT : 0; 643 } 644 645 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu) 646 { 647 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 648 struct kvm_s390_interrupt_info *inti; 649 int rc = 0; 650 651 spin_lock(&fi->lock); 652 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT], 653 struct kvm_s390_interrupt_info, 654 list); 655 if (inti) { 656 list_del(&inti->list); 657 fi->counters[FIRQ_CNTR_PFAULT] -= 1; 658 } 659 if (list_empty(&fi->lists[FIRQ_LIST_PFAULT])) 660 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs); 661 spin_unlock(&fi->lock); 662 663 if (inti) { 664 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, 665 KVM_S390_INT_PFAULT_DONE, 0, 666 inti->ext.ext_params2); 667 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx", 668 inti->ext.ext_params2); 669 670 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, 671 (u16 *)__LC_EXT_INT_CODE); 672 rc |= put_guest_lc(vcpu, PFAULT_DONE, 673 (u16 *)__LC_EXT_CPU_ADDR); 674 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 675 &vcpu->arch.sie_block->gpsw, 676 sizeof(psw_t)); 677 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 678 &vcpu->arch.sie_block->gpsw, 679 sizeof(psw_t)); 680 rc |= put_guest_lc(vcpu, inti->ext.ext_params2, 681 (u64 *)__LC_EXT_PARAMS2); 682 kfree(inti); 683 } 684 return rc ? -EFAULT : 0; 685 } 686 687 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu) 688 { 689 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 690 struct kvm_s390_interrupt_info *inti; 691 int rc = 0; 692 693 spin_lock(&fi->lock); 694 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO], 695 struct kvm_s390_interrupt_info, 696 list); 697 if (inti) { 698 VCPU_EVENT(vcpu, 4, 699 "deliver: virtio parm: 0x%x,parm64: 0x%llx", 700 inti->ext.ext_params, inti->ext.ext_params2); 701 vcpu->stat.deliver_virtio_interrupt++; 702 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, 703 inti->type, 704 inti->ext.ext_params, 705 inti->ext.ext_params2); 706 list_del(&inti->list); 707 fi->counters[FIRQ_CNTR_VIRTIO] -= 1; 708 } 709 if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO])) 710 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs); 711 spin_unlock(&fi->lock); 712 713 if (inti) { 714 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, 715 (u16 *)__LC_EXT_INT_CODE); 716 rc |= put_guest_lc(vcpu, VIRTIO_PARAM, 717 (u16 *)__LC_EXT_CPU_ADDR); 718 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 719 &vcpu->arch.sie_block->gpsw, 720 sizeof(psw_t)); 721 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 722 &vcpu->arch.sie_block->gpsw, 723 sizeof(psw_t)); 724 rc |= put_guest_lc(vcpu, inti->ext.ext_params, 725 (u32 *)__LC_EXT_PARAMS); 726 rc |= put_guest_lc(vcpu, inti->ext.ext_params2, 727 (u64 *)__LC_EXT_PARAMS2); 728 kfree(inti); 729 } 730 return rc ? -EFAULT : 0; 731 } 732 733 static int __must_check __deliver_io(struct kvm_vcpu *vcpu, 734 unsigned long irq_type) 735 { 736 struct list_head *isc_list; 737 struct kvm_s390_float_interrupt *fi; 738 struct kvm_s390_interrupt_info *inti = NULL; 739 int rc = 0; 740 741 fi = &vcpu->kvm->arch.float_int; 742 743 spin_lock(&fi->lock); 744 isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0]; 745 inti = list_first_entry_or_null(isc_list, 746 struct kvm_s390_interrupt_info, 747 list); 748 if (inti) { 749 VCPU_EVENT(vcpu, 4, "deliver: I/O 0x%llx", inti->type); 750 vcpu->stat.deliver_io_int++; 751 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, 752 inti->type, 753 ((__u32)inti->io.subchannel_id << 16) | 754 inti->io.subchannel_nr, 755 ((__u64)inti->io.io_int_parm << 32) | 756 inti->io.io_int_word); 757 list_del(&inti->list); 758 fi->counters[FIRQ_CNTR_IO] -= 1; 759 } 760 if (list_empty(isc_list)) 761 clear_bit(irq_type, &fi->pending_irqs); 762 spin_unlock(&fi->lock); 763 764 if (inti) { 765 rc = put_guest_lc(vcpu, inti->io.subchannel_id, 766 (u16 *)__LC_SUBCHANNEL_ID); 767 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr, 768 (u16 *)__LC_SUBCHANNEL_NR); 769 rc |= put_guest_lc(vcpu, inti->io.io_int_parm, 770 (u32 *)__LC_IO_INT_PARM); 771 rc |= put_guest_lc(vcpu, inti->io.io_int_word, 772 (u32 *)__LC_IO_INT_WORD); 773 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW, 774 &vcpu->arch.sie_block->gpsw, 775 sizeof(psw_t)); 776 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW, 777 &vcpu->arch.sie_block->gpsw, 778 sizeof(psw_t)); 779 kfree(inti); 780 } 781 782 return rc ? -EFAULT : 0; 783 } 784 785 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu); 786 787 static const deliver_irq_t deliver_irq_funcs[] = { 788 [IRQ_PEND_MCHK_EX] = __deliver_machine_check, 789 [IRQ_PEND_MCHK_REP] = __deliver_machine_check, 790 [IRQ_PEND_PROG] = __deliver_prog, 791 [IRQ_PEND_EXT_EMERGENCY] = __deliver_emergency_signal, 792 [IRQ_PEND_EXT_EXTERNAL] = __deliver_external_call, 793 [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc, 794 [IRQ_PEND_EXT_CPU_TIMER] = __deliver_cpu_timer, 795 [IRQ_PEND_RESTART] = __deliver_restart, 796 [IRQ_PEND_SET_PREFIX] = __deliver_set_prefix, 797 [IRQ_PEND_PFAULT_INIT] = __deliver_pfault_init, 798 [IRQ_PEND_EXT_SERVICE] = __deliver_service, 799 [IRQ_PEND_PFAULT_DONE] = __deliver_pfault_done, 800 [IRQ_PEND_VIRTIO] = __deliver_virtio, 801 }; 802 803 /* Check whether an external call is pending (deliverable or not) */ 804 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu) 805 { 806 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 807 uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl; 808 809 if (!sclp.has_sigpif) 810 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs); 811 812 return (sigp_ctrl & SIGP_CTRL_C) && 813 (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND); 814 } 815 816 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop) 817 { 818 int rc; 819 820 rc = !!deliverable_irqs(vcpu); 821 822 if (!rc && kvm_cpu_has_pending_timer(vcpu)) 823 rc = 1; 824 825 /* external call pending and deliverable */ 826 if (!rc && kvm_s390_ext_call_pending(vcpu) && 827 !psw_extint_disabled(vcpu) && 828 (vcpu->arch.sie_block->gcr[0] & 0x2000ul)) 829 rc = 1; 830 831 if (!rc && !exclude_stop && kvm_s390_is_stop_irq_pending(vcpu)) 832 rc = 1; 833 834 return rc; 835 } 836 837 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) 838 { 839 return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu); 840 } 841 842 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu) 843 { 844 u64 now, sltime; 845 846 vcpu->stat.exit_wait_state++; 847 848 /* fast path */ 849 if (kvm_cpu_has_pending_timer(vcpu) || kvm_arch_vcpu_runnable(vcpu)) 850 return 0; 851 852 if (psw_interrupts_disabled(vcpu)) { 853 VCPU_EVENT(vcpu, 3, "%s", "disabled wait"); 854 return -EOPNOTSUPP; /* disabled wait */ 855 } 856 857 if (!ckc_interrupts_enabled(vcpu)) { 858 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer"); 859 __set_cpu_idle(vcpu); 860 goto no_timer; 861 } 862 863 preempt_disable(); 864 now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch; 865 preempt_enable(); 866 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now); 867 868 /* underflow */ 869 if (vcpu->arch.sie_block->ckc < now) 870 return 0; 871 872 __set_cpu_idle(vcpu); 873 hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL); 874 VCPU_EVENT(vcpu, 4, "enabled wait via clock comparator: %llu ns", sltime); 875 no_timer: 876 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 877 kvm_vcpu_block(vcpu); 878 __unset_cpu_idle(vcpu); 879 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 880 881 hrtimer_cancel(&vcpu->arch.ckc_timer); 882 return 0; 883 } 884 885 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu) 886 { 887 if (waitqueue_active(&vcpu->wq)) { 888 /* 889 * The vcpu gave up the cpu voluntarily, mark it as a good 890 * yield-candidate. 891 */ 892 vcpu->preempted = true; 893 wake_up_interruptible(&vcpu->wq); 894 vcpu->stat.halt_wakeup++; 895 } 896 } 897 898 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer) 899 { 900 struct kvm_vcpu *vcpu; 901 u64 now, sltime; 902 903 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer); 904 preempt_disable(); 905 now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch; 906 preempt_enable(); 907 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now); 908 909 /* 910 * If the monotonic clock runs faster than the tod clock we might be 911 * woken up too early and have to go back to sleep to avoid deadlocks. 912 */ 913 if (vcpu->arch.sie_block->ckc > now && 914 hrtimer_forward_now(timer, ns_to_ktime(sltime))) 915 return HRTIMER_RESTART; 916 kvm_s390_vcpu_wakeup(vcpu); 917 return HRTIMER_NORESTART; 918 } 919 920 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu) 921 { 922 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 923 924 spin_lock(&li->lock); 925 li->pending_irqs = 0; 926 bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS); 927 memset(&li->irq, 0, sizeof(li->irq)); 928 spin_unlock(&li->lock); 929 930 /* clear pending external calls set by sigp interpretation facility */ 931 atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags); 932 vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl = 0; 933 } 934 935 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu) 936 { 937 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 938 deliver_irq_t func; 939 int rc = 0; 940 unsigned long irq_type; 941 unsigned long irqs; 942 943 __reset_intercept_indicators(vcpu); 944 945 /* pending ckc conditions might have been invalidated */ 946 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs); 947 if (ckc_irq_pending(vcpu)) 948 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs); 949 950 /* pending cpu timer conditions might have been invalidated */ 951 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs); 952 if (cpu_timer_irq_pending(vcpu)) 953 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs); 954 955 while ((irqs = deliverable_irqs(vcpu)) && !rc) { 956 /* bits are in the order of interrupt priority */ 957 irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT); 958 if (is_ioirq(irq_type)) { 959 rc = __deliver_io(vcpu, irq_type); 960 } else { 961 func = deliver_irq_funcs[irq_type]; 962 if (!func) { 963 WARN_ON_ONCE(func == NULL); 964 clear_bit(irq_type, &li->pending_irqs); 965 continue; 966 } 967 rc = func(vcpu); 968 } 969 } 970 971 set_intercept_indicators(vcpu); 972 973 return rc; 974 } 975 976 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 977 { 978 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 979 980 VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code); 981 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT, 982 irq->u.pgm.code, 0); 983 984 li->irq.pgm = irq->u.pgm; 985 set_bit(IRQ_PEND_PROG, &li->pending_irqs); 986 return 0; 987 } 988 989 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code) 990 { 991 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 992 struct kvm_s390_irq irq; 993 994 spin_lock(&li->lock); 995 irq.u.pgm.code = code; 996 __inject_prog(vcpu, &irq); 997 BUG_ON(waitqueue_active(li->wq)); 998 spin_unlock(&li->lock); 999 return 0; 1000 } 1001 1002 int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu, 1003 struct kvm_s390_pgm_info *pgm_info) 1004 { 1005 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1006 struct kvm_s390_irq irq; 1007 int rc; 1008 1009 spin_lock(&li->lock); 1010 irq.u.pgm = *pgm_info; 1011 rc = __inject_prog(vcpu, &irq); 1012 BUG_ON(waitqueue_active(li->wq)); 1013 spin_unlock(&li->lock); 1014 return rc; 1015 } 1016 1017 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 1018 { 1019 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1020 1021 VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx", 1022 irq->u.ext.ext_params2); 1023 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT, 1024 irq->u.ext.ext_params, 1025 irq->u.ext.ext_params2); 1026 1027 li->irq.ext = irq->u.ext; 1028 set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs); 1029 atomic_or(CPUSTAT_EXT_INT, li->cpuflags); 1030 return 0; 1031 } 1032 1033 static int __inject_extcall_sigpif(struct kvm_vcpu *vcpu, uint16_t src_id) 1034 { 1035 unsigned char new_val, old_val; 1036 uint8_t *sigp_ctrl = &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl; 1037 1038 new_val = SIGP_CTRL_C | (src_id & SIGP_CTRL_SCN_MASK); 1039 old_val = *sigp_ctrl & ~SIGP_CTRL_C; 1040 if (cmpxchg(sigp_ctrl, old_val, new_val) != old_val) { 1041 /* another external call is pending */ 1042 return -EBUSY; 1043 } 1044 atomic_or(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags); 1045 return 0; 1046 } 1047 1048 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 1049 { 1050 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1051 struct kvm_s390_extcall_info *extcall = &li->irq.extcall; 1052 uint16_t src_id = irq->u.extcall.code; 1053 1054 VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u", 1055 src_id); 1056 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL, 1057 src_id, 0); 1058 1059 /* sending vcpu invalid */ 1060 if (src_id >= KVM_MAX_VCPUS || 1061 kvm_get_vcpu(vcpu->kvm, src_id) == NULL) 1062 return -EINVAL; 1063 1064 if (sclp.has_sigpif) 1065 return __inject_extcall_sigpif(vcpu, src_id); 1066 1067 if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs)) 1068 return -EBUSY; 1069 *extcall = irq->u.extcall; 1070 atomic_or(CPUSTAT_EXT_INT, li->cpuflags); 1071 return 0; 1072 } 1073 1074 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 1075 { 1076 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1077 struct kvm_s390_prefix_info *prefix = &li->irq.prefix; 1078 1079 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x", 1080 irq->u.prefix.address); 1081 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX, 1082 irq->u.prefix.address, 0); 1083 1084 if (!is_vcpu_stopped(vcpu)) 1085 return -EBUSY; 1086 1087 *prefix = irq->u.prefix; 1088 set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs); 1089 return 0; 1090 } 1091 1092 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS) 1093 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 1094 { 1095 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1096 struct kvm_s390_stop_info *stop = &li->irq.stop; 1097 int rc = 0; 1098 1099 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0); 1100 1101 if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS) 1102 return -EINVAL; 1103 1104 if (is_vcpu_stopped(vcpu)) { 1105 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS) 1106 rc = kvm_s390_store_status_unloaded(vcpu, 1107 KVM_S390_STORE_STATUS_NOADDR); 1108 return rc; 1109 } 1110 1111 if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs)) 1112 return -EBUSY; 1113 stop->flags = irq->u.stop.flags; 1114 __set_cpuflag(vcpu, CPUSTAT_STOP_INT); 1115 return 0; 1116 } 1117 1118 static int __inject_sigp_restart(struct kvm_vcpu *vcpu, 1119 struct kvm_s390_irq *irq) 1120 { 1121 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1122 1123 VCPU_EVENT(vcpu, 3, "%s", "inject: restart int"); 1124 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0); 1125 1126 set_bit(IRQ_PEND_RESTART, &li->pending_irqs); 1127 return 0; 1128 } 1129 1130 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu, 1131 struct kvm_s390_irq *irq) 1132 { 1133 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1134 1135 VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u", 1136 irq->u.emerg.code); 1137 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY, 1138 irq->u.emerg.code, 0); 1139 1140 set_bit(irq->u.emerg.code, li->sigp_emerg_pending); 1141 set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs); 1142 atomic_or(CPUSTAT_EXT_INT, li->cpuflags); 1143 return 0; 1144 } 1145 1146 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 1147 { 1148 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1149 struct kvm_s390_mchk_info *mchk = &li->irq.mchk; 1150 1151 VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx", 1152 irq->u.mchk.mcic); 1153 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0, 1154 irq->u.mchk.mcic); 1155 1156 /* 1157 * Because repressible machine checks can be indicated along with 1158 * exigent machine checks (PoP, Chapter 11, Interruption action) 1159 * we need to combine cr14, mcic and external damage code. 1160 * Failing storage address and the logout area should not be or'ed 1161 * together, we just indicate the last occurrence of the corresponding 1162 * machine check 1163 */ 1164 mchk->cr14 |= irq->u.mchk.cr14; 1165 mchk->mcic |= irq->u.mchk.mcic; 1166 mchk->ext_damage_code |= irq->u.mchk.ext_damage_code; 1167 mchk->failing_storage_address = irq->u.mchk.failing_storage_address; 1168 memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout, 1169 sizeof(mchk->fixed_logout)); 1170 if (mchk->mcic & MCHK_EX_MASK) 1171 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs); 1172 else if (mchk->mcic & MCHK_REP_MASK) 1173 set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs); 1174 return 0; 1175 } 1176 1177 static int __inject_ckc(struct kvm_vcpu *vcpu) 1178 { 1179 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1180 1181 VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external"); 1182 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP, 1183 0, 0); 1184 1185 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs); 1186 atomic_or(CPUSTAT_EXT_INT, li->cpuflags); 1187 return 0; 1188 } 1189 1190 static int __inject_cpu_timer(struct kvm_vcpu *vcpu) 1191 { 1192 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1193 1194 VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external"); 1195 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER, 1196 0, 0); 1197 1198 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs); 1199 atomic_or(CPUSTAT_EXT_INT, li->cpuflags); 1200 return 0; 1201 } 1202 1203 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm, 1204 int isc, u32 schid) 1205 { 1206 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; 1207 struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc]; 1208 struct kvm_s390_interrupt_info *iter; 1209 u16 id = (schid & 0xffff0000U) >> 16; 1210 u16 nr = schid & 0x0000ffffU; 1211 1212 spin_lock(&fi->lock); 1213 list_for_each_entry(iter, isc_list, list) { 1214 if (schid && (id != iter->io.subchannel_id || 1215 nr != iter->io.subchannel_nr)) 1216 continue; 1217 /* found an appropriate entry */ 1218 list_del_init(&iter->list); 1219 fi->counters[FIRQ_CNTR_IO] -= 1; 1220 if (list_empty(isc_list)) 1221 clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs); 1222 spin_unlock(&fi->lock); 1223 return iter; 1224 } 1225 spin_unlock(&fi->lock); 1226 return NULL; 1227 } 1228 1229 /* 1230 * Dequeue and return an I/O interrupt matching any of the interruption 1231 * subclasses as designated by the isc mask in cr6 and the schid (if != 0). 1232 */ 1233 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm, 1234 u64 isc_mask, u32 schid) 1235 { 1236 struct kvm_s390_interrupt_info *inti = NULL; 1237 int isc; 1238 1239 for (isc = 0; isc <= MAX_ISC && !inti; isc++) { 1240 if (isc_mask & isc_to_isc_bits(isc)) 1241 inti = get_io_int(kvm, isc, schid); 1242 } 1243 return inti; 1244 } 1245 1246 #define SCCB_MASK 0xFFFFFFF8 1247 #define SCCB_EVENT_PENDING 0x3 1248 1249 static int __inject_service(struct kvm *kvm, 1250 struct kvm_s390_interrupt_info *inti) 1251 { 1252 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; 1253 1254 spin_lock(&fi->lock); 1255 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING; 1256 /* 1257 * Early versions of the QEMU s390 bios will inject several 1258 * service interrupts after another without handling a 1259 * condition code indicating busy. 1260 * We will silently ignore those superfluous sccb values. 1261 * A future version of QEMU will take care of serialization 1262 * of servc requests 1263 */ 1264 if (fi->srv_signal.ext_params & SCCB_MASK) 1265 goto out; 1266 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK; 1267 set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs); 1268 out: 1269 spin_unlock(&fi->lock); 1270 kfree(inti); 1271 return 0; 1272 } 1273 1274 static int __inject_virtio(struct kvm *kvm, 1275 struct kvm_s390_interrupt_info *inti) 1276 { 1277 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; 1278 1279 spin_lock(&fi->lock); 1280 if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) { 1281 spin_unlock(&fi->lock); 1282 return -EBUSY; 1283 } 1284 fi->counters[FIRQ_CNTR_VIRTIO] += 1; 1285 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]); 1286 set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs); 1287 spin_unlock(&fi->lock); 1288 return 0; 1289 } 1290 1291 static int __inject_pfault_done(struct kvm *kvm, 1292 struct kvm_s390_interrupt_info *inti) 1293 { 1294 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; 1295 1296 spin_lock(&fi->lock); 1297 if (fi->counters[FIRQ_CNTR_PFAULT] >= 1298 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) { 1299 spin_unlock(&fi->lock); 1300 return -EBUSY; 1301 } 1302 fi->counters[FIRQ_CNTR_PFAULT] += 1; 1303 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]); 1304 set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs); 1305 spin_unlock(&fi->lock); 1306 return 0; 1307 } 1308 1309 #define CR_PENDING_SUBCLASS 28 1310 static int __inject_float_mchk(struct kvm *kvm, 1311 struct kvm_s390_interrupt_info *inti) 1312 { 1313 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; 1314 1315 spin_lock(&fi->lock); 1316 fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS); 1317 fi->mchk.mcic |= inti->mchk.mcic; 1318 set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs); 1319 spin_unlock(&fi->lock); 1320 kfree(inti); 1321 return 0; 1322 } 1323 1324 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti) 1325 { 1326 struct kvm_s390_float_interrupt *fi; 1327 struct list_head *list; 1328 int isc; 1329 1330 fi = &kvm->arch.float_int; 1331 spin_lock(&fi->lock); 1332 if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) { 1333 spin_unlock(&fi->lock); 1334 return -EBUSY; 1335 } 1336 fi->counters[FIRQ_CNTR_IO] += 1; 1337 1338 isc = int_word_to_isc(inti->io.io_int_word); 1339 list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc]; 1340 list_add_tail(&inti->list, list); 1341 set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs); 1342 spin_unlock(&fi->lock); 1343 return 0; 1344 } 1345 1346 /* 1347 * Find a destination VCPU for a floating irq and kick it. 1348 */ 1349 static void __floating_irq_kick(struct kvm *kvm, u64 type) 1350 { 1351 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; 1352 struct kvm_s390_local_interrupt *li; 1353 struct kvm_vcpu *dst_vcpu; 1354 int sigcpu, online_vcpus, nr_tries = 0; 1355 1356 online_vcpus = atomic_read(&kvm->online_vcpus); 1357 if (!online_vcpus) 1358 return; 1359 1360 /* find idle VCPUs first, then round robin */ 1361 sigcpu = find_first_bit(fi->idle_mask, online_vcpus); 1362 if (sigcpu == online_vcpus) { 1363 do { 1364 sigcpu = fi->next_rr_cpu; 1365 fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus; 1366 /* avoid endless loops if all vcpus are stopped */ 1367 if (nr_tries++ >= online_vcpus) 1368 return; 1369 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu))); 1370 } 1371 dst_vcpu = kvm_get_vcpu(kvm, sigcpu); 1372 1373 /* make the VCPU drop out of the SIE, or wake it up if sleeping */ 1374 li = &dst_vcpu->arch.local_int; 1375 spin_lock(&li->lock); 1376 switch (type) { 1377 case KVM_S390_MCHK: 1378 atomic_or(CPUSTAT_STOP_INT, li->cpuflags); 1379 break; 1380 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 1381 atomic_or(CPUSTAT_IO_INT, li->cpuflags); 1382 break; 1383 default: 1384 atomic_or(CPUSTAT_EXT_INT, li->cpuflags); 1385 break; 1386 } 1387 spin_unlock(&li->lock); 1388 kvm_s390_vcpu_wakeup(dst_vcpu); 1389 } 1390 1391 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti) 1392 { 1393 struct kvm_s390_float_interrupt *fi; 1394 u64 type = READ_ONCE(inti->type); 1395 int rc; 1396 1397 fi = &kvm->arch.float_int; 1398 1399 switch (type) { 1400 case KVM_S390_MCHK: 1401 rc = __inject_float_mchk(kvm, inti); 1402 break; 1403 case KVM_S390_INT_VIRTIO: 1404 rc = __inject_virtio(kvm, inti); 1405 break; 1406 case KVM_S390_INT_SERVICE: 1407 rc = __inject_service(kvm, inti); 1408 break; 1409 case KVM_S390_INT_PFAULT_DONE: 1410 rc = __inject_pfault_done(kvm, inti); 1411 break; 1412 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 1413 rc = __inject_io(kvm, inti); 1414 break; 1415 default: 1416 rc = -EINVAL; 1417 } 1418 if (rc) 1419 return rc; 1420 1421 __floating_irq_kick(kvm, type); 1422 return 0; 1423 } 1424 1425 int kvm_s390_inject_vm(struct kvm *kvm, 1426 struct kvm_s390_interrupt *s390int) 1427 { 1428 struct kvm_s390_interrupt_info *inti; 1429 int rc; 1430 1431 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 1432 if (!inti) 1433 return -ENOMEM; 1434 1435 inti->type = s390int->type; 1436 switch (inti->type) { 1437 case KVM_S390_INT_VIRTIO: 1438 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx", 1439 s390int->parm, s390int->parm64); 1440 inti->ext.ext_params = s390int->parm; 1441 inti->ext.ext_params2 = s390int->parm64; 1442 break; 1443 case KVM_S390_INT_SERVICE: 1444 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm); 1445 inti->ext.ext_params = s390int->parm; 1446 break; 1447 case KVM_S390_INT_PFAULT_DONE: 1448 inti->ext.ext_params2 = s390int->parm64; 1449 break; 1450 case KVM_S390_MCHK: 1451 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx", 1452 s390int->parm64); 1453 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */ 1454 inti->mchk.mcic = s390int->parm64; 1455 break; 1456 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 1457 if (inti->type & KVM_S390_INT_IO_AI_MASK) 1458 VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)"); 1459 else 1460 VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x", 1461 s390int->type & IOINT_CSSID_MASK, 1462 s390int->type & IOINT_SSID_MASK, 1463 s390int->type & IOINT_SCHID_MASK); 1464 inti->io.subchannel_id = s390int->parm >> 16; 1465 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu; 1466 inti->io.io_int_parm = s390int->parm64 >> 32; 1467 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull; 1468 break; 1469 default: 1470 kfree(inti); 1471 return -EINVAL; 1472 } 1473 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64, 1474 2); 1475 1476 rc = __inject_vm(kvm, inti); 1477 if (rc) 1478 kfree(inti); 1479 return rc; 1480 } 1481 1482 int kvm_s390_reinject_io_int(struct kvm *kvm, 1483 struct kvm_s390_interrupt_info *inti) 1484 { 1485 return __inject_vm(kvm, inti); 1486 } 1487 1488 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int, 1489 struct kvm_s390_irq *irq) 1490 { 1491 irq->type = s390int->type; 1492 switch (irq->type) { 1493 case KVM_S390_PROGRAM_INT: 1494 if (s390int->parm & 0xffff0000) 1495 return -EINVAL; 1496 irq->u.pgm.code = s390int->parm; 1497 break; 1498 case KVM_S390_SIGP_SET_PREFIX: 1499 irq->u.prefix.address = s390int->parm; 1500 break; 1501 case KVM_S390_SIGP_STOP: 1502 irq->u.stop.flags = s390int->parm; 1503 break; 1504 case KVM_S390_INT_EXTERNAL_CALL: 1505 if (s390int->parm & 0xffff0000) 1506 return -EINVAL; 1507 irq->u.extcall.code = s390int->parm; 1508 break; 1509 case KVM_S390_INT_EMERGENCY: 1510 if (s390int->parm & 0xffff0000) 1511 return -EINVAL; 1512 irq->u.emerg.code = s390int->parm; 1513 break; 1514 case KVM_S390_MCHK: 1515 irq->u.mchk.mcic = s390int->parm64; 1516 break; 1517 } 1518 return 0; 1519 } 1520 1521 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu) 1522 { 1523 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1524 1525 return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs); 1526 } 1527 1528 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu) 1529 { 1530 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1531 1532 spin_lock(&li->lock); 1533 li->irq.stop.flags = 0; 1534 clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs); 1535 spin_unlock(&li->lock); 1536 } 1537 1538 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 1539 { 1540 int rc; 1541 1542 switch (irq->type) { 1543 case KVM_S390_PROGRAM_INT: 1544 rc = __inject_prog(vcpu, irq); 1545 break; 1546 case KVM_S390_SIGP_SET_PREFIX: 1547 rc = __inject_set_prefix(vcpu, irq); 1548 break; 1549 case KVM_S390_SIGP_STOP: 1550 rc = __inject_sigp_stop(vcpu, irq); 1551 break; 1552 case KVM_S390_RESTART: 1553 rc = __inject_sigp_restart(vcpu, irq); 1554 break; 1555 case KVM_S390_INT_CLOCK_COMP: 1556 rc = __inject_ckc(vcpu); 1557 break; 1558 case KVM_S390_INT_CPU_TIMER: 1559 rc = __inject_cpu_timer(vcpu); 1560 break; 1561 case KVM_S390_INT_EXTERNAL_CALL: 1562 rc = __inject_extcall(vcpu, irq); 1563 break; 1564 case KVM_S390_INT_EMERGENCY: 1565 rc = __inject_sigp_emergency(vcpu, irq); 1566 break; 1567 case KVM_S390_MCHK: 1568 rc = __inject_mchk(vcpu, irq); 1569 break; 1570 case KVM_S390_INT_PFAULT_INIT: 1571 rc = __inject_pfault_init(vcpu, irq); 1572 break; 1573 case KVM_S390_INT_VIRTIO: 1574 case KVM_S390_INT_SERVICE: 1575 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 1576 default: 1577 rc = -EINVAL; 1578 } 1579 1580 return rc; 1581 } 1582 1583 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 1584 { 1585 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1586 int rc; 1587 1588 spin_lock(&li->lock); 1589 rc = do_inject_vcpu(vcpu, irq); 1590 spin_unlock(&li->lock); 1591 if (!rc) 1592 kvm_s390_vcpu_wakeup(vcpu); 1593 return rc; 1594 } 1595 1596 static inline void clear_irq_list(struct list_head *_list) 1597 { 1598 struct kvm_s390_interrupt_info *inti, *n; 1599 1600 list_for_each_entry_safe(inti, n, _list, list) { 1601 list_del(&inti->list); 1602 kfree(inti); 1603 } 1604 } 1605 1606 static void inti_to_irq(struct kvm_s390_interrupt_info *inti, 1607 struct kvm_s390_irq *irq) 1608 { 1609 irq->type = inti->type; 1610 switch (inti->type) { 1611 case KVM_S390_INT_PFAULT_INIT: 1612 case KVM_S390_INT_PFAULT_DONE: 1613 case KVM_S390_INT_VIRTIO: 1614 irq->u.ext = inti->ext; 1615 break; 1616 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 1617 irq->u.io = inti->io; 1618 break; 1619 } 1620 } 1621 1622 void kvm_s390_clear_float_irqs(struct kvm *kvm) 1623 { 1624 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; 1625 int i; 1626 1627 spin_lock(&fi->lock); 1628 fi->pending_irqs = 0; 1629 memset(&fi->srv_signal, 0, sizeof(fi->srv_signal)); 1630 memset(&fi->mchk, 0, sizeof(fi->mchk)); 1631 for (i = 0; i < FIRQ_LIST_COUNT; i++) 1632 clear_irq_list(&fi->lists[i]); 1633 for (i = 0; i < FIRQ_MAX_COUNT; i++) 1634 fi->counters[i] = 0; 1635 spin_unlock(&fi->lock); 1636 }; 1637 1638 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len) 1639 { 1640 struct kvm_s390_interrupt_info *inti; 1641 struct kvm_s390_float_interrupt *fi; 1642 struct kvm_s390_irq *buf; 1643 struct kvm_s390_irq *irq; 1644 int max_irqs; 1645 int ret = 0; 1646 int n = 0; 1647 int i; 1648 1649 if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0) 1650 return -EINVAL; 1651 1652 /* 1653 * We are already using -ENOMEM to signal 1654 * userspace it may retry with a bigger buffer, 1655 * so we need to use something else for this case 1656 */ 1657 buf = vzalloc(len); 1658 if (!buf) 1659 return -ENOBUFS; 1660 1661 max_irqs = len / sizeof(struct kvm_s390_irq); 1662 1663 fi = &kvm->arch.float_int; 1664 spin_lock(&fi->lock); 1665 for (i = 0; i < FIRQ_LIST_COUNT; i++) { 1666 list_for_each_entry(inti, &fi->lists[i], list) { 1667 if (n == max_irqs) { 1668 /* signal userspace to try again */ 1669 ret = -ENOMEM; 1670 goto out; 1671 } 1672 inti_to_irq(inti, &buf[n]); 1673 n++; 1674 } 1675 } 1676 if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) { 1677 if (n == max_irqs) { 1678 /* signal userspace to try again */ 1679 ret = -ENOMEM; 1680 goto out; 1681 } 1682 irq = (struct kvm_s390_irq *) &buf[n]; 1683 irq->type = KVM_S390_INT_SERVICE; 1684 irq->u.ext = fi->srv_signal; 1685 n++; 1686 } 1687 if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) { 1688 if (n == max_irqs) { 1689 /* signal userspace to try again */ 1690 ret = -ENOMEM; 1691 goto out; 1692 } 1693 irq = (struct kvm_s390_irq *) &buf[n]; 1694 irq->type = KVM_S390_MCHK; 1695 irq->u.mchk = fi->mchk; 1696 n++; 1697 } 1698 1699 out: 1700 spin_unlock(&fi->lock); 1701 if (!ret && n > 0) { 1702 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n)) 1703 ret = -EFAULT; 1704 } 1705 vfree(buf); 1706 1707 return ret < 0 ? ret : n; 1708 } 1709 1710 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr) 1711 { 1712 int r; 1713 1714 switch (attr->group) { 1715 case KVM_DEV_FLIC_GET_ALL_IRQS: 1716 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr, 1717 attr->attr); 1718 break; 1719 default: 1720 r = -EINVAL; 1721 } 1722 1723 return r; 1724 } 1725 1726 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti, 1727 u64 addr) 1728 { 1729 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr; 1730 void *target = NULL; 1731 void __user *source; 1732 u64 size; 1733 1734 if (get_user(inti->type, (u64 __user *)addr)) 1735 return -EFAULT; 1736 1737 switch (inti->type) { 1738 case KVM_S390_INT_PFAULT_INIT: 1739 case KVM_S390_INT_PFAULT_DONE: 1740 case KVM_S390_INT_VIRTIO: 1741 case KVM_S390_INT_SERVICE: 1742 target = (void *) &inti->ext; 1743 source = &uptr->u.ext; 1744 size = sizeof(inti->ext); 1745 break; 1746 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 1747 target = (void *) &inti->io; 1748 source = &uptr->u.io; 1749 size = sizeof(inti->io); 1750 break; 1751 case KVM_S390_MCHK: 1752 target = (void *) &inti->mchk; 1753 source = &uptr->u.mchk; 1754 size = sizeof(inti->mchk); 1755 break; 1756 default: 1757 return -EINVAL; 1758 } 1759 1760 if (copy_from_user(target, source, size)) 1761 return -EFAULT; 1762 1763 return 0; 1764 } 1765 1766 static int enqueue_floating_irq(struct kvm_device *dev, 1767 struct kvm_device_attr *attr) 1768 { 1769 struct kvm_s390_interrupt_info *inti = NULL; 1770 int r = 0; 1771 int len = attr->attr; 1772 1773 if (len % sizeof(struct kvm_s390_irq) != 0) 1774 return -EINVAL; 1775 else if (len > KVM_S390_FLIC_MAX_BUFFER) 1776 return -EINVAL; 1777 1778 while (len >= sizeof(struct kvm_s390_irq)) { 1779 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 1780 if (!inti) 1781 return -ENOMEM; 1782 1783 r = copy_irq_from_user(inti, attr->addr); 1784 if (r) { 1785 kfree(inti); 1786 return r; 1787 } 1788 r = __inject_vm(dev->kvm, inti); 1789 if (r) { 1790 kfree(inti); 1791 return r; 1792 } 1793 len -= sizeof(struct kvm_s390_irq); 1794 attr->addr += sizeof(struct kvm_s390_irq); 1795 } 1796 1797 return r; 1798 } 1799 1800 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id) 1801 { 1802 if (id >= MAX_S390_IO_ADAPTERS) 1803 return NULL; 1804 return kvm->arch.adapters[id]; 1805 } 1806 1807 static int register_io_adapter(struct kvm_device *dev, 1808 struct kvm_device_attr *attr) 1809 { 1810 struct s390_io_adapter *adapter; 1811 struct kvm_s390_io_adapter adapter_info; 1812 1813 if (copy_from_user(&adapter_info, 1814 (void __user *)attr->addr, sizeof(adapter_info))) 1815 return -EFAULT; 1816 1817 if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) || 1818 (dev->kvm->arch.adapters[adapter_info.id] != NULL)) 1819 return -EINVAL; 1820 1821 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL); 1822 if (!adapter) 1823 return -ENOMEM; 1824 1825 INIT_LIST_HEAD(&adapter->maps); 1826 init_rwsem(&adapter->maps_lock); 1827 atomic_set(&adapter->nr_maps, 0); 1828 adapter->id = adapter_info.id; 1829 adapter->isc = adapter_info.isc; 1830 adapter->maskable = adapter_info.maskable; 1831 adapter->masked = false; 1832 adapter->swap = adapter_info.swap; 1833 dev->kvm->arch.adapters[adapter->id] = adapter; 1834 1835 return 0; 1836 } 1837 1838 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked) 1839 { 1840 int ret; 1841 struct s390_io_adapter *adapter = get_io_adapter(kvm, id); 1842 1843 if (!adapter || !adapter->maskable) 1844 return -EINVAL; 1845 ret = adapter->masked; 1846 adapter->masked = masked; 1847 return ret; 1848 } 1849 1850 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr) 1851 { 1852 struct s390_io_adapter *adapter = get_io_adapter(kvm, id); 1853 struct s390_map_info *map; 1854 int ret; 1855 1856 if (!adapter || !addr) 1857 return -EINVAL; 1858 1859 map = kzalloc(sizeof(*map), GFP_KERNEL); 1860 if (!map) { 1861 ret = -ENOMEM; 1862 goto out; 1863 } 1864 INIT_LIST_HEAD(&map->list); 1865 map->guest_addr = addr; 1866 map->addr = gmap_translate(kvm->arch.gmap, addr); 1867 if (map->addr == -EFAULT) { 1868 ret = -EFAULT; 1869 goto out; 1870 } 1871 ret = get_user_pages_fast(map->addr, 1, 1, &map->page); 1872 if (ret < 0) 1873 goto out; 1874 BUG_ON(ret != 1); 1875 down_write(&adapter->maps_lock); 1876 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) { 1877 list_add_tail(&map->list, &adapter->maps); 1878 ret = 0; 1879 } else { 1880 put_page(map->page); 1881 ret = -EINVAL; 1882 } 1883 up_write(&adapter->maps_lock); 1884 out: 1885 if (ret) 1886 kfree(map); 1887 return ret; 1888 } 1889 1890 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr) 1891 { 1892 struct s390_io_adapter *adapter = get_io_adapter(kvm, id); 1893 struct s390_map_info *map, *tmp; 1894 int found = 0; 1895 1896 if (!adapter || !addr) 1897 return -EINVAL; 1898 1899 down_write(&adapter->maps_lock); 1900 list_for_each_entry_safe(map, tmp, &adapter->maps, list) { 1901 if (map->guest_addr == addr) { 1902 found = 1; 1903 atomic_dec(&adapter->nr_maps); 1904 list_del(&map->list); 1905 put_page(map->page); 1906 kfree(map); 1907 break; 1908 } 1909 } 1910 up_write(&adapter->maps_lock); 1911 1912 return found ? 0 : -EINVAL; 1913 } 1914 1915 void kvm_s390_destroy_adapters(struct kvm *kvm) 1916 { 1917 int i; 1918 struct s390_map_info *map, *tmp; 1919 1920 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) { 1921 if (!kvm->arch.adapters[i]) 1922 continue; 1923 list_for_each_entry_safe(map, tmp, 1924 &kvm->arch.adapters[i]->maps, list) { 1925 list_del(&map->list); 1926 put_page(map->page); 1927 kfree(map); 1928 } 1929 kfree(kvm->arch.adapters[i]); 1930 } 1931 } 1932 1933 static int modify_io_adapter(struct kvm_device *dev, 1934 struct kvm_device_attr *attr) 1935 { 1936 struct kvm_s390_io_adapter_req req; 1937 struct s390_io_adapter *adapter; 1938 int ret; 1939 1940 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req))) 1941 return -EFAULT; 1942 1943 adapter = get_io_adapter(dev->kvm, req.id); 1944 if (!adapter) 1945 return -EINVAL; 1946 switch (req.type) { 1947 case KVM_S390_IO_ADAPTER_MASK: 1948 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask); 1949 if (ret > 0) 1950 ret = 0; 1951 break; 1952 case KVM_S390_IO_ADAPTER_MAP: 1953 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr); 1954 break; 1955 case KVM_S390_IO_ADAPTER_UNMAP: 1956 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr); 1957 break; 1958 default: 1959 ret = -EINVAL; 1960 } 1961 1962 return ret; 1963 } 1964 1965 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr) 1966 { 1967 int r = 0; 1968 unsigned int i; 1969 struct kvm_vcpu *vcpu; 1970 1971 switch (attr->group) { 1972 case KVM_DEV_FLIC_ENQUEUE: 1973 r = enqueue_floating_irq(dev, attr); 1974 break; 1975 case KVM_DEV_FLIC_CLEAR_IRQS: 1976 kvm_s390_clear_float_irqs(dev->kvm); 1977 break; 1978 case KVM_DEV_FLIC_APF_ENABLE: 1979 dev->kvm->arch.gmap->pfault_enabled = 1; 1980 break; 1981 case KVM_DEV_FLIC_APF_DISABLE_WAIT: 1982 dev->kvm->arch.gmap->pfault_enabled = 0; 1983 /* 1984 * Make sure no async faults are in transition when 1985 * clearing the queues. So we don't need to worry 1986 * about late coming workers. 1987 */ 1988 synchronize_srcu(&dev->kvm->srcu); 1989 kvm_for_each_vcpu(i, vcpu, dev->kvm) 1990 kvm_clear_async_pf_completion_queue(vcpu); 1991 break; 1992 case KVM_DEV_FLIC_ADAPTER_REGISTER: 1993 r = register_io_adapter(dev, attr); 1994 break; 1995 case KVM_DEV_FLIC_ADAPTER_MODIFY: 1996 r = modify_io_adapter(dev, attr); 1997 break; 1998 default: 1999 r = -EINVAL; 2000 } 2001 2002 return r; 2003 } 2004 2005 static int flic_create(struct kvm_device *dev, u32 type) 2006 { 2007 if (!dev) 2008 return -EINVAL; 2009 if (dev->kvm->arch.flic) 2010 return -EINVAL; 2011 dev->kvm->arch.flic = dev; 2012 return 0; 2013 } 2014 2015 static void flic_destroy(struct kvm_device *dev) 2016 { 2017 dev->kvm->arch.flic = NULL; 2018 kfree(dev); 2019 } 2020 2021 /* s390 floating irq controller (flic) */ 2022 struct kvm_device_ops kvm_flic_ops = { 2023 .name = "kvm-flic", 2024 .get_attr = flic_get_attr, 2025 .set_attr = flic_set_attr, 2026 .create = flic_create, 2027 .destroy = flic_destroy, 2028 }; 2029 2030 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap) 2031 { 2032 unsigned long bit; 2033 2034 bit = bit_nr + (addr % PAGE_SIZE) * 8; 2035 2036 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit; 2037 } 2038 2039 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter, 2040 u64 addr) 2041 { 2042 struct s390_map_info *map; 2043 2044 if (!adapter) 2045 return NULL; 2046 2047 list_for_each_entry(map, &adapter->maps, list) { 2048 if (map->guest_addr == addr) 2049 return map; 2050 } 2051 return NULL; 2052 } 2053 2054 static int adapter_indicators_set(struct kvm *kvm, 2055 struct s390_io_adapter *adapter, 2056 struct kvm_s390_adapter_int *adapter_int) 2057 { 2058 unsigned long bit; 2059 int summary_set, idx; 2060 struct s390_map_info *info; 2061 void *map; 2062 2063 info = get_map_info(adapter, adapter_int->ind_addr); 2064 if (!info) 2065 return -1; 2066 map = page_address(info->page); 2067 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap); 2068 set_bit(bit, map); 2069 idx = srcu_read_lock(&kvm->srcu); 2070 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT); 2071 set_page_dirty_lock(info->page); 2072 info = get_map_info(adapter, adapter_int->summary_addr); 2073 if (!info) { 2074 srcu_read_unlock(&kvm->srcu, idx); 2075 return -1; 2076 } 2077 map = page_address(info->page); 2078 bit = get_ind_bit(info->addr, adapter_int->summary_offset, 2079 adapter->swap); 2080 summary_set = test_and_set_bit(bit, map); 2081 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT); 2082 set_page_dirty_lock(info->page); 2083 srcu_read_unlock(&kvm->srcu, idx); 2084 return summary_set ? 0 : 1; 2085 } 2086 2087 /* 2088 * < 0 - not injected due to error 2089 * = 0 - coalesced, summary indicator already active 2090 * > 0 - injected interrupt 2091 */ 2092 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e, 2093 struct kvm *kvm, int irq_source_id, int level, 2094 bool line_status) 2095 { 2096 int ret; 2097 struct s390_io_adapter *adapter; 2098 2099 /* We're only interested in the 0->1 transition. */ 2100 if (!level) 2101 return 0; 2102 adapter = get_io_adapter(kvm, e->adapter.adapter_id); 2103 if (!adapter) 2104 return -1; 2105 down_read(&adapter->maps_lock); 2106 ret = adapter_indicators_set(kvm, adapter, &e->adapter); 2107 up_read(&adapter->maps_lock); 2108 if ((ret > 0) && !adapter->masked) { 2109 struct kvm_s390_interrupt s390int = { 2110 .type = KVM_S390_INT_IO(1, 0, 0, 0), 2111 .parm = 0, 2112 .parm64 = (adapter->isc << 27) | 0x80000000, 2113 }; 2114 ret = kvm_s390_inject_vm(kvm, &s390int); 2115 if (ret == 0) 2116 ret = 1; 2117 } 2118 return ret; 2119 } 2120 2121 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e, 2122 const struct kvm_irq_routing_entry *ue) 2123 { 2124 int ret; 2125 2126 switch (ue->type) { 2127 case KVM_IRQ_ROUTING_S390_ADAPTER: 2128 e->set = set_adapter_int; 2129 e->adapter.summary_addr = ue->u.adapter.summary_addr; 2130 e->adapter.ind_addr = ue->u.adapter.ind_addr; 2131 e->adapter.summary_offset = ue->u.adapter.summary_offset; 2132 e->adapter.ind_offset = ue->u.adapter.ind_offset; 2133 e->adapter.adapter_id = ue->u.adapter.adapter_id; 2134 ret = 0; 2135 break; 2136 default: 2137 ret = -EINVAL; 2138 } 2139 2140 return ret; 2141 } 2142 2143 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm, 2144 int irq_source_id, int level, bool line_status) 2145 { 2146 return -EINVAL; 2147 } 2148 2149 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len) 2150 { 2151 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 2152 struct kvm_s390_irq *buf; 2153 int r = 0; 2154 int n; 2155 2156 buf = vmalloc(len); 2157 if (!buf) 2158 return -ENOMEM; 2159 2160 if (copy_from_user((void *) buf, irqstate, len)) { 2161 r = -EFAULT; 2162 goto out_free; 2163 } 2164 2165 /* 2166 * Don't allow setting the interrupt state 2167 * when there are already interrupts pending 2168 */ 2169 spin_lock(&li->lock); 2170 if (li->pending_irqs) { 2171 r = -EBUSY; 2172 goto out_unlock; 2173 } 2174 2175 for (n = 0; n < len / sizeof(*buf); n++) { 2176 r = do_inject_vcpu(vcpu, &buf[n]); 2177 if (r) 2178 break; 2179 } 2180 2181 out_unlock: 2182 spin_unlock(&li->lock); 2183 out_free: 2184 vfree(buf); 2185 2186 return r; 2187 } 2188 2189 static void store_local_irq(struct kvm_s390_local_interrupt *li, 2190 struct kvm_s390_irq *irq, 2191 unsigned long irq_type) 2192 { 2193 switch (irq_type) { 2194 case IRQ_PEND_MCHK_EX: 2195 case IRQ_PEND_MCHK_REP: 2196 irq->type = KVM_S390_MCHK; 2197 irq->u.mchk = li->irq.mchk; 2198 break; 2199 case IRQ_PEND_PROG: 2200 irq->type = KVM_S390_PROGRAM_INT; 2201 irq->u.pgm = li->irq.pgm; 2202 break; 2203 case IRQ_PEND_PFAULT_INIT: 2204 irq->type = KVM_S390_INT_PFAULT_INIT; 2205 irq->u.ext = li->irq.ext; 2206 break; 2207 case IRQ_PEND_EXT_EXTERNAL: 2208 irq->type = KVM_S390_INT_EXTERNAL_CALL; 2209 irq->u.extcall = li->irq.extcall; 2210 break; 2211 case IRQ_PEND_EXT_CLOCK_COMP: 2212 irq->type = KVM_S390_INT_CLOCK_COMP; 2213 break; 2214 case IRQ_PEND_EXT_CPU_TIMER: 2215 irq->type = KVM_S390_INT_CPU_TIMER; 2216 break; 2217 case IRQ_PEND_SIGP_STOP: 2218 irq->type = KVM_S390_SIGP_STOP; 2219 irq->u.stop = li->irq.stop; 2220 break; 2221 case IRQ_PEND_RESTART: 2222 irq->type = KVM_S390_RESTART; 2223 break; 2224 case IRQ_PEND_SET_PREFIX: 2225 irq->type = KVM_S390_SIGP_SET_PREFIX; 2226 irq->u.prefix = li->irq.prefix; 2227 break; 2228 } 2229 } 2230 2231 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len) 2232 { 2233 uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl; 2234 unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)]; 2235 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 2236 unsigned long pending_irqs; 2237 struct kvm_s390_irq irq; 2238 unsigned long irq_type; 2239 int cpuaddr; 2240 int n = 0; 2241 2242 spin_lock(&li->lock); 2243 pending_irqs = li->pending_irqs; 2244 memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending, 2245 sizeof(sigp_emerg_pending)); 2246 spin_unlock(&li->lock); 2247 2248 for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) { 2249 memset(&irq, 0, sizeof(irq)); 2250 if (irq_type == IRQ_PEND_EXT_EMERGENCY) 2251 continue; 2252 if (n + sizeof(irq) > len) 2253 return -ENOBUFS; 2254 store_local_irq(&vcpu->arch.local_int, &irq, irq_type); 2255 if (copy_to_user(&buf[n], &irq, sizeof(irq))) 2256 return -EFAULT; 2257 n += sizeof(irq); 2258 } 2259 2260 if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) { 2261 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) { 2262 memset(&irq, 0, sizeof(irq)); 2263 if (n + sizeof(irq) > len) 2264 return -ENOBUFS; 2265 irq.type = KVM_S390_INT_EMERGENCY; 2266 irq.u.emerg.code = cpuaddr; 2267 if (copy_to_user(&buf[n], &irq, sizeof(irq))) 2268 return -EFAULT; 2269 n += sizeof(irq); 2270 } 2271 } 2272 2273 if ((sigp_ctrl & SIGP_CTRL_C) && 2274 (atomic_read(&vcpu->arch.sie_block->cpuflags) & 2275 CPUSTAT_ECALL_PEND)) { 2276 if (n + sizeof(irq) > len) 2277 return -ENOBUFS; 2278 memset(&irq, 0, sizeof(irq)); 2279 irq.type = KVM_S390_INT_EXTERNAL_CALL; 2280 irq.u.extcall.code = sigp_ctrl & SIGP_CTRL_SCN_MASK; 2281 if (copy_to_user(&buf[n], &irq, sizeof(irq))) 2282 return -EFAULT; 2283 n += sizeof(irq); 2284 } 2285 2286 return n; 2287 } 2288