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 IOINT_AI_MASK 0x04000000 34 #define PFAULT_INIT 0x0600 35 #define PFAULT_DONE 0x0680 36 #define VIRTIO_PARAM 0x0d00 37 38 int psw_extint_disabled(struct kvm_vcpu *vcpu) 39 { 40 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT); 41 } 42 43 static int psw_ioint_disabled(struct kvm_vcpu *vcpu) 44 { 45 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO); 46 } 47 48 static int psw_mchk_disabled(struct kvm_vcpu *vcpu) 49 { 50 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK); 51 } 52 53 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu) 54 { 55 if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) || 56 (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) || 57 (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT)) 58 return 0; 59 return 1; 60 } 61 62 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu) 63 { 64 if (psw_extint_disabled(vcpu) || 65 !(vcpu->arch.sie_block->gcr[0] & 0x800ul)) 66 return 0; 67 if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu)) 68 /* No timer interrupts when single stepping */ 69 return 0; 70 return 1; 71 } 72 73 static int ckc_irq_pending(struct kvm_vcpu *vcpu) 74 { 75 if (!(vcpu->arch.sie_block->ckc < 76 get_tod_clock_fast() + vcpu->arch.sie_block->epoch)) 77 return 0; 78 return ckc_interrupts_enabled(vcpu); 79 } 80 81 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu) 82 { 83 return !psw_extint_disabled(vcpu) && 84 (vcpu->arch.sie_block->gcr[0] & 0x400ul); 85 } 86 87 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu) 88 { 89 return (vcpu->arch.sie_block->cputm >> 63) && 90 cpu_timer_interrupts_enabled(vcpu); 91 } 92 93 static inline int is_ioirq(unsigned long irq_type) 94 { 95 return ((irq_type >= IRQ_PEND_IO_ISC_0) && 96 (irq_type <= IRQ_PEND_IO_ISC_7)); 97 } 98 99 static uint64_t isc_to_isc_bits(int isc) 100 { 101 return (0x80 >> isc) << 24; 102 } 103 104 static inline u8 int_word_to_isc(u32 int_word) 105 { 106 return (int_word & 0x38000000) >> 27; 107 } 108 109 static inline unsigned long pending_floating_irqs(struct kvm_vcpu *vcpu) 110 { 111 return vcpu->kvm->arch.float_int.pending_irqs; 112 } 113 114 static inline unsigned long pending_local_irqs(struct kvm_vcpu *vcpu) 115 { 116 return vcpu->arch.local_int.pending_irqs; 117 } 118 119 static unsigned long disable_iscs(struct kvm_vcpu *vcpu, 120 unsigned long active_mask) 121 { 122 int i; 123 124 for (i = 0; i <= MAX_ISC; i++) 125 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i))) 126 active_mask &= ~(1UL << (IRQ_PEND_IO_ISC_0 + i)); 127 128 return active_mask; 129 } 130 131 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu) 132 { 133 unsigned long active_mask; 134 135 active_mask = pending_local_irqs(vcpu); 136 active_mask |= pending_floating_irqs(vcpu); 137 if (!active_mask) 138 return 0; 139 140 if (psw_extint_disabled(vcpu)) 141 active_mask &= ~IRQ_PEND_EXT_MASK; 142 if (psw_ioint_disabled(vcpu)) 143 active_mask &= ~IRQ_PEND_IO_MASK; 144 else 145 active_mask = disable_iscs(vcpu, active_mask); 146 if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul)) 147 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask); 148 if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul)) 149 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask); 150 if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul)) 151 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask); 152 if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul)) 153 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask); 154 if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul)) 155 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask); 156 if (psw_mchk_disabled(vcpu)) 157 active_mask &= ~IRQ_PEND_MCHK_MASK; 158 if (!(vcpu->arch.sie_block->gcr[14] & 159 vcpu->kvm->arch.float_int.mchk.cr14)) 160 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask); 161 162 /* 163 * STOP irqs will never be actively delivered. They are triggered via 164 * intercept requests and cleared when the stop intercept is performed. 165 */ 166 __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask); 167 168 return active_mask; 169 } 170 171 static void __set_cpu_idle(struct kvm_vcpu *vcpu) 172 { 173 atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags); 174 set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask); 175 } 176 177 static void __unset_cpu_idle(struct kvm_vcpu *vcpu) 178 { 179 atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags); 180 clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask); 181 } 182 183 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu) 184 { 185 atomic_clear_mask(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT, 186 &vcpu->arch.sie_block->cpuflags); 187 vcpu->arch.sie_block->lctl = 0x0000; 188 vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT); 189 190 if (guestdbg_enabled(vcpu)) { 191 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 | 192 LCTL_CR10 | LCTL_CR11); 193 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT); 194 } 195 } 196 197 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag) 198 { 199 atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags); 200 } 201 202 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu) 203 { 204 if (!(pending_floating_irqs(vcpu) & IRQ_PEND_IO_MASK)) 205 return; 206 else if (psw_ioint_disabled(vcpu)) 207 __set_cpuflag(vcpu, CPUSTAT_IO_INT); 208 else 209 vcpu->arch.sie_block->lctl |= LCTL_CR6; 210 } 211 212 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu) 213 { 214 if (!(pending_local_irqs(vcpu) & IRQ_PEND_EXT_MASK)) 215 return; 216 if (psw_extint_disabled(vcpu)) 217 __set_cpuflag(vcpu, CPUSTAT_EXT_INT); 218 else 219 vcpu->arch.sie_block->lctl |= LCTL_CR0; 220 } 221 222 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu) 223 { 224 if (!(pending_local_irqs(vcpu) & IRQ_PEND_MCHK_MASK)) 225 return; 226 if (psw_mchk_disabled(vcpu)) 227 vcpu->arch.sie_block->ictl |= ICTL_LPSW; 228 else 229 vcpu->arch.sie_block->lctl |= LCTL_CR14; 230 } 231 232 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu) 233 { 234 if (kvm_s390_is_stop_irq_pending(vcpu)) 235 __set_cpuflag(vcpu, CPUSTAT_STOP_INT); 236 } 237 238 /* Set interception request for non-deliverable interrupts */ 239 static void set_intercept_indicators(struct kvm_vcpu *vcpu) 240 { 241 set_intercept_indicators_io(vcpu); 242 set_intercept_indicators_ext(vcpu); 243 set_intercept_indicators_mchk(vcpu); 244 set_intercept_indicators_stop(vcpu); 245 } 246 247 static u16 get_ilc(struct kvm_vcpu *vcpu) 248 { 249 switch (vcpu->arch.sie_block->icptcode) { 250 case ICPT_INST: 251 case ICPT_INSTPROGI: 252 case ICPT_OPEREXC: 253 case ICPT_PARTEXEC: 254 case ICPT_IOINST: 255 /* last instruction only stored for these icptcodes */ 256 return insn_length(vcpu->arch.sie_block->ipa >> 8); 257 case ICPT_PROGI: 258 return vcpu->arch.sie_block->pgmilc; 259 default: 260 return 0; 261 } 262 } 263 264 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu) 265 { 266 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 267 int rc; 268 269 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER, 270 0, 0); 271 272 rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER, 273 (u16 *)__LC_EXT_INT_CODE); 274 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR); 275 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 276 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 277 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 278 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 279 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs); 280 return rc ? -EFAULT : 0; 281 } 282 283 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu) 284 { 285 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 286 int rc; 287 288 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP, 289 0, 0); 290 291 rc = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP, 292 (u16 __user *)__LC_EXT_INT_CODE); 293 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR); 294 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 295 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 296 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 297 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 298 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs); 299 return rc ? -EFAULT : 0; 300 } 301 302 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu) 303 { 304 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 305 struct kvm_s390_ext_info ext; 306 int rc; 307 308 spin_lock(&li->lock); 309 ext = li->irq.ext; 310 clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs); 311 li->irq.ext.ext_params2 = 0; 312 spin_unlock(&li->lock); 313 314 VCPU_EVENT(vcpu, 4, "interrupt: pfault init parm:%x,parm64:%llx", 315 0, ext.ext_params2); 316 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, 317 KVM_S390_INT_PFAULT_INIT, 318 0, ext.ext_params2); 319 320 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE); 321 rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR); 322 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 323 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 324 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 325 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 326 rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2); 327 return rc ? -EFAULT : 0; 328 } 329 330 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu) 331 { 332 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 333 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 334 struct kvm_s390_mchk_info mchk = {}; 335 unsigned long adtl_status_addr; 336 int deliver = 0; 337 int rc = 0; 338 339 spin_lock(&fi->lock); 340 spin_lock(&li->lock); 341 if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) || 342 test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) { 343 /* 344 * If there was an exigent machine check pending, then any 345 * repressible machine checks that might have been pending 346 * are indicated along with it, so always clear bits for 347 * repressible and exigent interrupts 348 */ 349 mchk = li->irq.mchk; 350 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs); 351 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs); 352 memset(&li->irq.mchk, 0, sizeof(mchk)); 353 deliver = 1; 354 } 355 /* 356 * We indicate floating repressible conditions along with 357 * other pending conditions. Channel Report Pending and Channel 358 * Subsystem damage are the only two and and are indicated by 359 * bits in mcic and masked in cr14. 360 */ 361 if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) { 362 mchk.mcic |= fi->mchk.mcic; 363 mchk.cr14 |= fi->mchk.cr14; 364 memset(&fi->mchk, 0, sizeof(mchk)); 365 deliver = 1; 366 } 367 spin_unlock(&li->lock); 368 spin_unlock(&fi->lock); 369 370 if (deliver) { 371 VCPU_EVENT(vcpu, 4, "interrupt: machine check mcic=%llx", 372 mchk.mcic); 373 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, 374 KVM_S390_MCHK, 375 mchk.cr14, mchk.mcic); 376 377 rc = kvm_s390_vcpu_store_status(vcpu, 378 KVM_S390_STORE_STATUS_PREFIXED); 379 rc |= read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR, 380 &adtl_status_addr, 381 sizeof(unsigned long)); 382 rc |= kvm_s390_vcpu_store_adtl_status(vcpu, 383 adtl_status_addr); 384 rc |= put_guest_lc(vcpu, mchk.mcic, 385 (u64 __user *) __LC_MCCK_CODE); 386 rc |= put_guest_lc(vcpu, mchk.failing_storage_address, 387 (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR); 388 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA, 389 &mchk.fixed_logout, 390 sizeof(mchk.fixed_logout)); 391 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW, 392 &vcpu->arch.sie_block->gpsw, 393 sizeof(psw_t)); 394 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW, 395 &vcpu->arch.sie_block->gpsw, 396 sizeof(psw_t)); 397 } 398 return rc ? -EFAULT : 0; 399 } 400 401 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu) 402 { 403 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 404 int rc; 405 406 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart"); 407 vcpu->stat.deliver_restart_signal++; 408 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0); 409 410 rc = write_guest_lc(vcpu, 411 offsetof(struct _lowcore, restart_old_psw), 412 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 413 rc |= read_guest_lc(vcpu, offsetof(struct _lowcore, restart_psw), 414 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 415 clear_bit(IRQ_PEND_RESTART, &li->pending_irqs); 416 return rc ? -EFAULT : 0; 417 } 418 419 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu) 420 { 421 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 422 struct kvm_s390_prefix_info prefix; 423 424 spin_lock(&li->lock); 425 prefix = li->irq.prefix; 426 li->irq.prefix.address = 0; 427 clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs); 428 spin_unlock(&li->lock); 429 430 VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x", prefix.address); 431 vcpu->stat.deliver_prefix_signal++; 432 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, 433 KVM_S390_SIGP_SET_PREFIX, 434 prefix.address, 0); 435 436 kvm_s390_set_prefix(vcpu, prefix.address); 437 return 0; 438 } 439 440 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu) 441 { 442 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 443 int rc; 444 int cpu_addr; 445 446 spin_lock(&li->lock); 447 cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS); 448 clear_bit(cpu_addr, li->sigp_emerg_pending); 449 if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS)) 450 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs); 451 spin_unlock(&li->lock); 452 453 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg"); 454 vcpu->stat.deliver_emergency_signal++; 455 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY, 456 cpu_addr, 0); 457 458 rc = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG, 459 (u16 *)__LC_EXT_INT_CODE); 460 rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR); 461 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 462 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 463 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 464 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 465 return rc ? -EFAULT : 0; 466 } 467 468 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu) 469 { 470 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 471 struct kvm_s390_extcall_info extcall; 472 int rc; 473 474 spin_lock(&li->lock); 475 extcall = li->irq.extcall; 476 li->irq.extcall.code = 0; 477 clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs); 478 spin_unlock(&li->lock); 479 480 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call"); 481 vcpu->stat.deliver_external_call++; 482 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, 483 KVM_S390_INT_EXTERNAL_CALL, 484 extcall.code, 0); 485 486 rc = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL, 487 (u16 *)__LC_EXT_INT_CODE); 488 rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR); 489 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 490 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 491 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw, 492 sizeof(psw_t)); 493 return rc ? -EFAULT : 0; 494 } 495 496 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu) 497 { 498 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 499 struct kvm_s390_pgm_info pgm_info; 500 int rc = 0, nullifying = false; 501 u16 ilc = get_ilc(vcpu); 502 503 spin_lock(&li->lock); 504 pgm_info = li->irq.pgm; 505 clear_bit(IRQ_PEND_PROG, &li->pending_irqs); 506 memset(&li->irq.pgm, 0, sizeof(pgm_info)); 507 spin_unlock(&li->lock); 508 509 VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x", 510 pgm_info.code, ilc); 511 vcpu->stat.deliver_program_int++; 512 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT, 513 pgm_info.code, 0); 514 515 switch (pgm_info.code & ~PGM_PER) { 516 case PGM_AFX_TRANSLATION: 517 case PGM_ASX_TRANSLATION: 518 case PGM_EX_TRANSLATION: 519 case PGM_LFX_TRANSLATION: 520 case PGM_LSTE_SEQUENCE: 521 case PGM_LSX_TRANSLATION: 522 case PGM_LX_TRANSLATION: 523 case PGM_PRIMARY_AUTHORITY: 524 case PGM_SECONDARY_AUTHORITY: 525 nullifying = true; 526 /* fall through */ 527 case PGM_SPACE_SWITCH: 528 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code, 529 (u64 *)__LC_TRANS_EXC_CODE); 530 break; 531 case PGM_ALEN_TRANSLATION: 532 case PGM_ALE_SEQUENCE: 533 case PGM_ASTE_INSTANCE: 534 case PGM_ASTE_SEQUENCE: 535 case PGM_ASTE_VALIDITY: 536 case PGM_EXTENDED_AUTHORITY: 537 rc = put_guest_lc(vcpu, pgm_info.exc_access_id, 538 (u8 *)__LC_EXC_ACCESS_ID); 539 nullifying = true; 540 break; 541 case PGM_ASCE_TYPE: 542 case PGM_PAGE_TRANSLATION: 543 case PGM_REGION_FIRST_TRANS: 544 case PGM_REGION_SECOND_TRANS: 545 case PGM_REGION_THIRD_TRANS: 546 case PGM_SEGMENT_TRANSLATION: 547 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code, 548 (u64 *)__LC_TRANS_EXC_CODE); 549 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id, 550 (u8 *)__LC_EXC_ACCESS_ID); 551 rc |= put_guest_lc(vcpu, pgm_info.op_access_id, 552 (u8 *)__LC_OP_ACCESS_ID); 553 nullifying = true; 554 break; 555 case PGM_MONITOR: 556 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr, 557 (u16 *)__LC_MON_CLASS_NR); 558 rc |= put_guest_lc(vcpu, pgm_info.mon_code, 559 (u64 *)__LC_MON_CODE); 560 break; 561 case PGM_VECTOR_PROCESSING: 562 case PGM_DATA: 563 rc = put_guest_lc(vcpu, pgm_info.data_exc_code, 564 (u32 *)__LC_DATA_EXC_CODE); 565 break; 566 case PGM_PROTECTION: 567 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code, 568 (u64 *)__LC_TRANS_EXC_CODE); 569 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id, 570 (u8 *)__LC_EXC_ACCESS_ID); 571 break; 572 case PGM_STACK_FULL: 573 case PGM_STACK_EMPTY: 574 case PGM_STACK_SPECIFICATION: 575 case PGM_STACK_TYPE: 576 case PGM_STACK_OPERATION: 577 case PGM_TRACE_TABEL: 578 case PGM_CRYPTO_OPERATION: 579 nullifying = true; 580 break; 581 } 582 583 if (pgm_info.code & PGM_PER) { 584 rc |= put_guest_lc(vcpu, pgm_info.per_code, 585 (u8 *) __LC_PER_CODE); 586 rc |= put_guest_lc(vcpu, pgm_info.per_atmid, 587 (u8 *)__LC_PER_ATMID); 588 rc |= put_guest_lc(vcpu, pgm_info.per_address, 589 (u64 *) __LC_PER_ADDRESS); 590 rc |= put_guest_lc(vcpu, pgm_info.per_access_id, 591 (u8 *) __LC_PER_ACCESS_ID); 592 } 593 594 if (nullifying && vcpu->arch.sie_block->icptcode == ICPT_INST) 595 kvm_s390_rewind_psw(vcpu, ilc); 596 597 rc |= put_guest_lc(vcpu, ilc, (u16 *) __LC_PGM_ILC); 598 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea, 599 (u64 *) __LC_LAST_BREAK); 600 rc |= put_guest_lc(vcpu, pgm_info.code, 601 (u16 *)__LC_PGM_INT_CODE); 602 rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW, 603 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 604 rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW, 605 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 606 return rc ? -EFAULT : 0; 607 } 608 609 static int __must_check __deliver_service(struct kvm_vcpu *vcpu) 610 { 611 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 612 struct kvm_s390_ext_info ext; 613 int rc = 0; 614 615 spin_lock(&fi->lock); 616 if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) { 617 spin_unlock(&fi->lock); 618 return 0; 619 } 620 ext = fi->srv_signal; 621 memset(&fi->srv_signal, 0, sizeof(ext)); 622 clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs); 623 spin_unlock(&fi->lock); 624 625 VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x", 626 ext.ext_params); 627 vcpu->stat.deliver_service_signal++; 628 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE, 629 ext.ext_params, 0); 630 631 rc = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE); 632 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR); 633 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 634 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 635 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 636 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 637 rc |= put_guest_lc(vcpu, ext.ext_params, 638 (u32 *)__LC_EXT_PARAMS); 639 640 return rc ? -EFAULT : 0; 641 } 642 643 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu) 644 { 645 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 646 struct kvm_s390_interrupt_info *inti; 647 int rc = 0; 648 649 spin_lock(&fi->lock); 650 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT], 651 struct kvm_s390_interrupt_info, 652 list); 653 if (inti) { 654 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, 655 KVM_S390_INT_PFAULT_DONE, 0, 656 inti->ext.ext_params2); 657 list_del(&inti->list); 658 fi->counters[FIRQ_CNTR_PFAULT] -= 1; 659 } 660 if (list_empty(&fi->lists[FIRQ_LIST_PFAULT])) 661 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs); 662 spin_unlock(&fi->lock); 663 664 if (inti) { 665 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, 666 (u16 *)__LC_EXT_INT_CODE); 667 rc |= put_guest_lc(vcpu, PFAULT_DONE, 668 (u16 *)__LC_EXT_CPU_ADDR); 669 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 670 &vcpu->arch.sie_block->gpsw, 671 sizeof(psw_t)); 672 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 673 &vcpu->arch.sie_block->gpsw, 674 sizeof(psw_t)); 675 rc |= put_guest_lc(vcpu, inti->ext.ext_params2, 676 (u64 *)__LC_EXT_PARAMS2); 677 kfree(inti); 678 } 679 return rc ? -EFAULT : 0; 680 } 681 682 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu) 683 { 684 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 685 struct kvm_s390_interrupt_info *inti; 686 int rc = 0; 687 688 spin_lock(&fi->lock); 689 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO], 690 struct kvm_s390_interrupt_info, 691 list); 692 if (inti) { 693 VCPU_EVENT(vcpu, 4, 694 "interrupt: virtio parm:%x,parm64:%llx", 695 inti->ext.ext_params, inti->ext.ext_params2); 696 vcpu->stat.deliver_virtio_interrupt++; 697 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, 698 inti->type, 699 inti->ext.ext_params, 700 inti->ext.ext_params2); 701 list_del(&inti->list); 702 fi->counters[FIRQ_CNTR_VIRTIO] -= 1; 703 } 704 if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO])) 705 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs); 706 spin_unlock(&fi->lock); 707 708 if (inti) { 709 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, 710 (u16 *)__LC_EXT_INT_CODE); 711 rc |= put_guest_lc(vcpu, VIRTIO_PARAM, 712 (u16 *)__LC_EXT_CPU_ADDR); 713 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 714 &vcpu->arch.sie_block->gpsw, 715 sizeof(psw_t)); 716 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 717 &vcpu->arch.sie_block->gpsw, 718 sizeof(psw_t)); 719 rc |= put_guest_lc(vcpu, inti->ext.ext_params, 720 (u32 *)__LC_EXT_PARAMS); 721 rc |= put_guest_lc(vcpu, inti->ext.ext_params2, 722 (u64 *)__LC_EXT_PARAMS2); 723 kfree(inti); 724 } 725 return rc ? -EFAULT : 0; 726 } 727 728 static int __must_check __deliver_io(struct kvm_vcpu *vcpu, 729 unsigned long irq_type) 730 { 731 struct list_head *isc_list; 732 struct kvm_s390_float_interrupt *fi; 733 struct kvm_s390_interrupt_info *inti = NULL; 734 int rc = 0; 735 736 fi = &vcpu->kvm->arch.float_int; 737 738 spin_lock(&fi->lock); 739 isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0]; 740 inti = list_first_entry_or_null(isc_list, 741 struct kvm_s390_interrupt_info, 742 list); 743 if (inti) { 744 VCPU_EVENT(vcpu, 4, "interrupt: I/O %llx", inti->type); 745 vcpu->stat.deliver_io_int++; 746 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, 747 inti->type, 748 ((__u32)inti->io.subchannel_id << 16) | 749 inti->io.subchannel_nr, 750 ((__u64)inti->io.io_int_parm << 32) | 751 inti->io.io_int_word); 752 list_del(&inti->list); 753 fi->counters[FIRQ_CNTR_IO] -= 1; 754 } 755 if (list_empty(isc_list)) 756 clear_bit(irq_type, &fi->pending_irqs); 757 spin_unlock(&fi->lock); 758 759 if (inti) { 760 rc = put_guest_lc(vcpu, inti->io.subchannel_id, 761 (u16 *)__LC_SUBCHANNEL_ID); 762 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr, 763 (u16 *)__LC_SUBCHANNEL_NR); 764 rc |= put_guest_lc(vcpu, inti->io.io_int_parm, 765 (u32 *)__LC_IO_INT_PARM); 766 rc |= put_guest_lc(vcpu, inti->io.io_int_word, 767 (u32 *)__LC_IO_INT_WORD); 768 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW, 769 &vcpu->arch.sie_block->gpsw, 770 sizeof(psw_t)); 771 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW, 772 &vcpu->arch.sie_block->gpsw, 773 sizeof(psw_t)); 774 kfree(inti); 775 } 776 777 return rc ? -EFAULT : 0; 778 } 779 780 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu); 781 782 static const deliver_irq_t deliver_irq_funcs[] = { 783 [IRQ_PEND_MCHK_EX] = __deliver_machine_check, 784 [IRQ_PEND_MCHK_REP] = __deliver_machine_check, 785 [IRQ_PEND_PROG] = __deliver_prog, 786 [IRQ_PEND_EXT_EMERGENCY] = __deliver_emergency_signal, 787 [IRQ_PEND_EXT_EXTERNAL] = __deliver_external_call, 788 [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc, 789 [IRQ_PEND_EXT_CPU_TIMER] = __deliver_cpu_timer, 790 [IRQ_PEND_RESTART] = __deliver_restart, 791 [IRQ_PEND_SET_PREFIX] = __deliver_set_prefix, 792 [IRQ_PEND_PFAULT_INIT] = __deliver_pfault_init, 793 [IRQ_PEND_EXT_SERVICE] = __deliver_service, 794 [IRQ_PEND_PFAULT_DONE] = __deliver_pfault_done, 795 [IRQ_PEND_VIRTIO] = __deliver_virtio, 796 }; 797 798 /* Check whether an external call is pending (deliverable or not) */ 799 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu) 800 { 801 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 802 uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl; 803 804 if (!sclp.has_sigpif) 805 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs); 806 807 return (sigp_ctrl & SIGP_CTRL_C) && 808 (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND); 809 } 810 811 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop) 812 { 813 int rc; 814 815 rc = !!deliverable_irqs(vcpu); 816 817 if (!rc && kvm_cpu_has_pending_timer(vcpu)) 818 rc = 1; 819 820 /* external call pending and deliverable */ 821 if (!rc && kvm_s390_ext_call_pending(vcpu) && 822 !psw_extint_disabled(vcpu) && 823 (vcpu->arch.sie_block->gcr[0] & 0x2000ul)) 824 rc = 1; 825 826 if (!rc && !exclude_stop && kvm_s390_is_stop_irq_pending(vcpu)) 827 rc = 1; 828 829 return rc; 830 } 831 832 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) 833 { 834 return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu); 835 } 836 837 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu) 838 { 839 u64 now, sltime; 840 841 vcpu->stat.exit_wait_state++; 842 843 /* fast path */ 844 if (kvm_cpu_has_pending_timer(vcpu) || kvm_arch_vcpu_runnable(vcpu)) 845 return 0; 846 847 if (psw_interrupts_disabled(vcpu)) { 848 VCPU_EVENT(vcpu, 3, "%s", "disabled wait"); 849 return -EOPNOTSUPP; /* disabled wait */ 850 } 851 852 if (!ckc_interrupts_enabled(vcpu)) { 853 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer"); 854 __set_cpu_idle(vcpu); 855 goto no_timer; 856 } 857 858 now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch; 859 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now); 860 861 /* underflow */ 862 if (vcpu->arch.sie_block->ckc < now) 863 return 0; 864 865 __set_cpu_idle(vcpu); 866 hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL); 867 VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime); 868 no_timer: 869 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 870 kvm_vcpu_block(vcpu); 871 __unset_cpu_idle(vcpu); 872 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 873 874 hrtimer_cancel(&vcpu->arch.ckc_timer); 875 return 0; 876 } 877 878 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu) 879 { 880 if (waitqueue_active(&vcpu->wq)) { 881 /* 882 * The vcpu gave up the cpu voluntarily, mark it as a good 883 * yield-candidate. 884 */ 885 vcpu->preempted = true; 886 wake_up_interruptible(&vcpu->wq); 887 vcpu->stat.halt_wakeup++; 888 } 889 } 890 891 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer) 892 { 893 struct kvm_vcpu *vcpu; 894 u64 now, sltime; 895 896 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer); 897 now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch; 898 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now); 899 900 /* 901 * If the monotonic clock runs faster than the tod clock we might be 902 * woken up too early and have to go back to sleep to avoid deadlocks. 903 */ 904 if (vcpu->arch.sie_block->ckc > now && 905 hrtimer_forward_now(timer, ns_to_ktime(sltime))) 906 return HRTIMER_RESTART; 907 kvm_s390_vcpu_wakeup(vcpu); 908 return HRTIMER_NORESTART; 909 } 910 911 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu) 912 { 913 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 914 915 spin_lock(&li->lock); 916 li->pending_irqs = 0; 917 bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS); 918 memset(&li->irq, 0, sizeof(li->irq)); 919 spin_unlock(&li->lock); 920 921 /* clear pending external calls set by sigp interpretation facility */ 922 atomic_clear_mask(CPUSTAT_ECALL_PEND, li->cpuflags); 923 vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl = 0; 924 } 925 926 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu) 927 { 928 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 929 deliver_irq_t func; 930 int rc = 0; 931 unsigned long irq_type; 932 unsigned long irqs; 933 934 __reset_intercept_indicators(vcpu); 935 936 /* pending ckc conditions might have been invalidated */ 937 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs); 938 if (ckc_irq_pending(vcpu)) 939 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs); 940 941 /* pending cpu timer conditions might have been invalidated */ 942 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs); 943 if (cpu_timer_irq_pending(vcpu)) 944 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs); 945 946 while ((irqs = deliverable_irqs(vcpu)) && !rc) { 947 /* bits are in the order of interrupt priority */ 948 irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT); 949 if (is_ioirq(irq_type)) { 950 rc = __deliver_io(vcpu, irq_type); 951 } else { 952 func = deliver_irq_funcs[irq_type]; 953 if (!func) { 954 WARN_ON_ONCE(func == NULL); 955 clear_bit(irq_type, &li->pending_irqs); 956 continue; 957 } 958 rc = func(vcpu); 959 } 960 } 961 962 set_intercept_indicators(vcpu); 963 964 return rc; 965 } 966 967 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 968 { 969 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 970 971 li->irq.pgm = irq->u.pgm; 972 set_bit(IRQ_PEND_PROG, &li->pending_irqs); 973 return 0; 974 } 975 976 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code) 977 { 978 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 979 struct kvm_s390_irq irq; 980 981 VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code); 982 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT, code, 983 0, 1); 984 spin_lock(&li->lock); 985 irq.u.pgm.code = code; 986 __inject_prog(vcpu, &irq); 987 BUG_ON(waitqueue_active(li->wq)); 988 spin_unlock(&li->lock); 989 return 0; 990 } 991 992 int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu, 993 struct kvm_s390_pgm_info *pgm_info) 994 { 995 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 996 struct kvm_s390_irq irq; 997 int rc; 998 999 VCPU_EVENT(vcpu, 3, "inject: prog irq %d (from kernel)", 1000 pgm_info->code); 1001 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT, 1002 pgm_info->code, 0, 1); 1003 spin_lock(&li->lock); 1004 irq.u.pgm = *pgm_info; 1005 rc = __inject_prog(vcpu, &irq); 1006 BUG_ON(waitqueue_active(li->wq)); 1007 spin_unlock(&li->lock); 1008 return rc; 1009 } 1010 1011 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 1012 { 1013 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1014 1015 VCPU_EVENT(vcpu, 3, "inject: external irq params:%x, params2:%llx", 1016 irq->u.ext.ext_params, irq->u.ext.ext_params2); 1017 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT, 1018 irq->u.ext.ext_params, 1019 irq->u.ext.ext_params2, 2); 1020 1021 li->irq.ext = irq->u.ext; 1022 set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs); 1023 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); 1024 return 0; 1025 } 1026 1027 static int __inject_extcall_sigpif(struct kvm_vcpu *vcpu, uint16_t src_id) 1028 { 1029 unsigned char new_val, old_val; 1030 uint8_t *sigp_ctrl = &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl; 1031 1032 new_val = SIGP_CTRL_C | (src_id & SIGP_CTRL_SCN_MASK); 1033 old_val = *sigp_ctrl & ~SIGP_CTRL_C; 1034 if (cmpxchg(sigp_ctrl, old_val, new_val) != old_val) { 1035 /* another external call is pending */ 1036 return -EBUSY; 1037 } 1038 atomic_set_mask(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags); 1039 return 0; 1040 } 1041 1042 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 1043 { 1044 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1045 struct kvm_s390_extcall_info *extcall = &li->irq.extcall; 1046 uint16_t src_id = irq->u.extcall.code; 1047 1048 VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u", 1049 src_id); 1050 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL, 1051 src_id, 0, 2); 1052 1053 /* sending vcpu invalid */ 1054 if (src_id >= KVM_MAX_VCPUS || 1055 kvm_get_vcpu(vcpu->kvm, src_id) == NULL) 1056 return -EINVAL; 1057 1058 if (sclp.has_sigpif) 1059 return __inject_extcall_sigpif(vcpu, src_id); 1060 1061 if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs)) 1062 return -EBUSY; 1063 *extcall = irq->u.extcall; 1064 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); 1065 return 0; 1066 } 1067 1068 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 1069 { 1070 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1071 struct kvm_s390_prefix_info *prefix = &li->irq.prefix; 1072 1073 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)", 1074 irq->u.prefix.address); 1075 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX, 1076 irq->u.prefix.address, 0, 2); 1077 1078 if (!is_vcpu_stopped(vcpu)) 1079 return -EBUSY; 1080 1081 *prefix = irq->u.prefix; 1082 set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs); 1083 return 0; 1084 } 1085 1086 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS) 1087 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 1088 { 1089 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1090 struct kvm_s390_stop_info *stop = &li->irq.stop; 1091 int rc = 0; 1092 1093 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0, 2); 1094 1095 if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS) 1096 return -EINVAL; 1097 1098 if (is_vcpu_stopped(vcpu)) { 1099 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS) 1100 rc = kvm_s390_store_status_unloaded(vcpu, 1101 KVM_S390_STORE_STATUS_NOADDR); 1102 return rc; 1103 } 1104 1105 if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs)) 1106 return -EBUSY; 1107 stop->flags = irq->u.stop.flags; 1108 __set_cpuflag(vcpu, CPUSTAT_STOP_INT); 1109 return 0; 1110 } 1111 1112 static int __inject_sigp_restart(struct kvm_vcpu *vcpu, 1113 struct kvm_s390_irq *irq) 1114 { 1115 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1116 1117 VCPU_EVENT(vcpu, 3, "inject: restart type %llx", irq->type); 1118 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0, 2); 1119 1120 set_bit(IRQ_PEND_RESTART, &li->pending_irqs); 1121 return 0; 1122 } 1123 1124 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu, 1125 struct kvm_s390_irq *irq) 1126 { 1127 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1128 1129 VCPU_EVENT(vcpu, 3, "inject: emergency %u\n", 1130 irq->u.emerg.code); 1131 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY, 1132 irq->u.emerg.code, 0, 2); 1133 1134 set_bit(irq->u.emerg.code, li->sigp_emerg_pending); 1135 set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs); 1136 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); 1137 return 0; 1138 } 1139 1140 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 1141 { 1142 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1143 struct kvm_s390_mchk_info *mchk = &li->irq.mchk; 1144 1145 VCPU_EVENT(vcpu, 5, "inject: machine check parm64:%llx", 1146 irq->u.mchk.mcic); 1147 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0, 1148 irq->u.mchk.mcic, 2); 1149 1150 /* 1151 * Because repressible machine checks can be indicated along with 1152 * exigent machine checks (PoP, Chapter 11, Interruption action) 1153 * we need to combine cr14, mcic and external damage code. 1154 * Failing storage address and the logout area should not be or'ed 1155 * together, we just indicate the last occurrence of the corresponding 1156 * machine check 1157 */ 1158 mchk->cr14 |= irq->u.mchk.cr14; 1159 mchk->mcic |= irq->u.mchk.mcic; 1160 mchk->ext_damage_code |= irq->u.mchk.ext_damage_code; 1161 mchk->failing_storage_address = irq->u.mchk.failing_storage_address; 1162 memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout, 1163 sizeof(mchk->fixed_logout)); 1164 if (mchk->mcic & MCHK_EX_MASK) 1165 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs); 1166 else if (mchk->mcic & MCHK_REP_MASK) 1167 set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs); 1168 return 0; 1169 } 1170 1171 static int __inject_ckc(struct kvm_vcpu *vcpu) 1172 { 1173 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1174 1175 VCPU_EVENT(vcpu, 3, "inject: type %x", KVM_S390_INT_CLOCK_COMP); 1176 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP, 1177 0, 0, 2); 1178 1179 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs); 1180 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); 1181 return 0; 1182 } 1183 1184 static int __inject_cpu_timer(struct kvm_vcpu *vcpu) 1185 { 1186 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1187 1188 VCPU_EVENT(vcpu, 3, "inject: type %x", KVM_S390_INT_CPU_TIMER); 1189 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER, 1190 0, 0, 2); 1191 1192 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs); 1193 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); 1194 return 0; 1195 } 1196 1197 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm, 1198 int isc, u32 schid) 1199 { 1200 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; 1201 struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc]; 1202 struct kvm_s390_interrupt_info *iter; 1203 u16 id = (schid & 0xffff0000U) >> 16; 1204 u16 nr = schid & 0x0000ffffU; 1205 1206 spin_lock(&fi->lock); 1207 list_for_each_entry(iter, isc_list, list) { 1208 if (schid && (id != iter->io.subchannel_id || 1209 nr != iter->io.subchannel_nr)) 1210 continue; 1211 /* found an appropriate entry */ 1212 list_del_init(&iter->list); 1213 fi->counters[FIRQ_CNTR_IO] -= 1; 1214 if (list_empty(isc_list)) 1215 clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs); 1216 spin_unlock(&fi->lock); 1217 return iter; 1218 } 1219 spin_unlock(&fi->lock); 1220 return NULL; 1221 } 1222 1223 /* 1224 * Dequeue and return an I/O interrupt matching any of the interruption 1225 * subclasses as designated by the isc mask in cr6 and the schid (if != 0). 1226 */ 1227 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm, 1228 u64 isc_mask, u32 schid) 1229 { 1230 struct kvm_s390_interrupt_info *inti = NULL; 1231 int isc; 1232 1233 for (isc = 0; isc <= MAX_ISC && !inti; isc++) { 1234 if (isc_mask & isc_to_isc_bits(isc)) 1235 inti = get_io_int(kvm, isc, schid); 1236 } 1237 return inti; 1238 } 1239 1240 #define SCCB_MASK 0xFFFFFFF8 1241 #define SCCB_EVENT_PENDING 0x3 1242 1243 static int __inject_service(struct kvm *kvm, 1244 struct kvm_s390_interrupt_info *inti) 1245 { 1246 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; 1247 1248 spin_lock(&fi->lock); 1249 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING; 1250 /* 1251 * Early versions of the QEMU s390 bios will inject several 1252 * service interrupts after another without handling a 1253 * condition code indicating busy. 1254 * We will silently ignore those superfluous sccb values. 1255 * A future version of QEMU will take care of serialization 1256 * of servc requests 1257 */ 1258 if (fi->srv_signal.ext_params & SCCB_MASK) 1259 goto out; 1260 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK; 1261 set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs); 1262 out: 1263 spin_unlock(&fi->lock); 1264 kfree(inti); 1265 return 0; 1266 } 1267 1268 static int __inject_virtio(struct kvm *kvm, 1269 struct kvm_s390_interrupt_info *inti) 1270 { 1271 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; 1272 1273 spin_lock(&fi->lock); 1274 if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) { 1275 spin_unlock(&fi->lock); 1276 return -EBUSY; 1277 } 1278 fi->counters[FIRQ_CNTR_VIRTIO] += 1; 1279 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]); 1280 set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs); 1281 spin_unlock(&fi->lock); 1282 return 0; 1283 } 1284 1285 static int __inject_pfault_done(struct kvm *kvm, 1286 struct kvm_s390_interrupt_info *inti) 1287 { 1288 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; 1289 1290 spin_lock(&fi->lock); 1291 if (fi->counters[FIRQ_CNTR_PFAULT] >= 1292 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) { 1293 spin_unlock(&fi->lock); 1294 return -EBUSY; 1295 } 1296 fi->counters[FIRQ_CNTR_PFAULT] += 1; 1297 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]); 1298 set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs); 1299 spin_unlock(&fi->lock); 1300 return 0; 1301 } 1302 1303 #define CR_PENDING_SUBCLASS 28 1304 static int __inject_float_mchk(struct kvm *kvm, 1305 struct kvm_s390_interrupt_info *inti) 1306 { 1307 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; 1308 1309 spin_lock(&fi->lock); 1310 fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS); 1311 fi->mchk.mcic |= inti->mchk.mcic; 1312 set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs); 1313 spin_unlock(&fi->lock); 1314 kfree(inti); 1315 return 0; 1316 } 1317 1318 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti) 1319 { 1320 struct kvm_s390_float_interrupt *fi; 1321 struct list_head *list; 1322 int isc; 1323 1324 fi = &kvm->arch.float_int; 1325 spin_lock(&fi->lock); 1326 if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) { 1327 spin_unlock(&fi->lock); 1328 return -EBUSY; 1329 } 1330 fi->counters[FIRQ_CNTR_IO] += 1; 1331 1332 isc = int_word_to_isc(inti->io.io_int_word); 1333 list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc]; 1334 list_add_tail(&inti->list, list); 1335 set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs); 1336 spin_unlock(&fi->lock); 1337 return 0; 1338 } 1339 1340 /* 1341 * Find a destination VCPU for a floating irq and kick it. 1342 */ 1343 static void __floating_irq_kick(struct kvm *kvm, u64 type) 1344 { 1345 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; 1346 struct kvm_s390_local_interrupt *li; 1347 struct kvm_vcpu *dst_vcpu; 1348 int sigcpu, online_vcpus, nr_tries = 0; 1349 1350 online_vcpus = atomic_read(&kvm->online_vcpus); 1351 if (!online_vcpus) 1352 return; 1353 1354 /* find idle VCPUs first, then round robin */ 1355 sigcpu = find_first_bit(fi->idle_mask, online_vcpus); 1356 if (sigcpu == online_vcpus) { 1357 do { 1358 sigcpu = fi->next_rr_cpu; 1359 fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus; 1360 /* avoid endless loops if all vcpus are stopped */ 1361 if (nr_tries++ >= online_vcpus) 1362 return; 1363 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu))); 1364 } 1365 dst_vcpu = kvm_get_vcpu(kvm, sigcpu); 1366 1367 /* make the VCPU drop out of the SIE, or wake it up if sleeping */ 1368 li = &dst_vcpu->arch.local_int; 1369 spin_lock(&li->lock); 1370 switch (type) { 1371 case KVM_S390_MCHK: 1372 atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags); 1373 break; 1374 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 1375 atomic_set_mask(CPUSTAT_IO_INT, li->cpuflags); 1376 break; 1377 default: 1378 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); 1379 break; 1380 } 1381 spin_unlock(&li->lock); 1382 kvm_s390_vcpu_wakeup(dst_vcpu); 1383 } 1384 1385 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti) 1386 { 1387 struct kvm_s390_float_interrupt *fi; 1388 u64 type = READ_ONCE(inti->type); 1389 int rc; 1390 1391 fi = &kvm->arch.float_int; 1392 1393 switch (type) { 1394 case KVM_S390_MCHK: 1395 rc = __inject_float_mchk(kvm, inti); 1396 break; 1397 case KVM_S390_INT_VIRTIO: 1398 rc = __inject_virtio(kvm, inti); 1399 break; 1400 case KVM_S390_INT_SERVICE: 1401 rc = __inject_service(kvm, inti); 1402 break; 1403 case KVM_S390_INT_PFAULT_DONE: 1404 rc = __inject_pfault_done(kvm, inti); 1405 break; 1406 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 1407 rc = __inject_io(kvm, inti); 1408 break; 1409 default: 1410 rc = -EINVAL; 1411 } 1412 if (rc) 1413 return rc; 1414 1415 __floating_irq_kick(kvm, type); 1416 return 0; 1417 } 1418 1419 int kvm_s390_inject_vm(struct kvm *kvm, 1420 struct kvm_s390_interrupt *s390int) 1421 { 1422 struct kvm_s390_interrupt_info *inti; 1423 int rc; 1424 1425 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 1426 if (!inti) 1427 return -ENOMEM; 1428 1429 inti->type = s390int->type; 1430 switch (inti->type) { 1431 case KVM_S390_INT_VIRTIO: 1432 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx", 1433 s390int->parm, s390int->parm64); 1434 inti->ext.ext_params = s390int->parm; 1435 inti->ext.ext_params2 = s390int->parm64; 1436 break; 1437 case KVM_S390_INT_SERVICE: 1438 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm); 1439 inti->ext.ext_params = s390int->parm; 1440 break; 1441 case KVM_S390_INT_PFAULT_DONE: 1442 inti->ext.ext_params2 = s390int->parm64; 1443 break; 1444 case KVM_S390_MCHK: 1445 VM_EVENT(kvm, 5, "inject: machine check parm64:%llx", 1446 s390int->parm64); 1447 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */ 1448 inti->mchk.mcic = s390int->parm64; 1449 break; 1450 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 1451 if (inti->type & IOINT_AI_MASK) 1452 VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)"); 1453 else 1454 VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x", 1455 s390int->type & IOINT_CSSID_MASK, 1456 s390int->type & IOINT_SSID_MASK, 1457 s390int->type & IOINT_SCHID_MASK); 1458 inti->io.subchannel_id = s390int->parm >> 16; 1459 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu; 1460 inti->io.io_int_parm = s390int->parm64 >> 32; 1461 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull; 1462 break; 1463 default: 1464 kfree(inti); 1465 return -EINVAL; 1466 } 1467 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64, 1468 2); 1469 1470 rc = __inject_vm(kvm, inti); 1471 if (rc) 1472 kfree(inti); 1473 return rc; 1474 } 1475 1476 int kvm_s390_reinject_io_int(struct kvm *kvm, 1477 struct kvm_s390_interrupt_info *inti) 1478 { 1479 return __inject_vm(kvm, inti); 1480 } 1481 1482 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int, 1483 struct kvm_s390_irq *irq) 1484 { 1485 irq->type = s390int->type; 1486 switch (irq->type) { 1487 case KVM_S390_PROGRAM_INT: 1488 if (s390int->parm & 0xffff0000) 1489 return -EINVAL; 1490 irq->u.pgm.code = s390int->parm; 1491 break; 1492 case KVM_S390_SIGP_SET_PREFIX: 1493 irq->u.prefix.address = s390int->parm; 1494 break; 1495 case KVM_S390_SIGP_STOP: 1496 irq->u.stop.flags = s390int->parm; 1497 break; 1498 case KVM_S390_INT_EXTERNAL_CALL: 1499 if (s390int->parm & 0xffff0000) 1500 return -EINVAL; 1501 irq->u.extcall.code = s390int->parm; 1502 break; 1503 case KVM_S390_INT_EMERGENCY: 1504 if (s390int->parm & 0xffff0000) 1505 return -EINVAL; 1506 irq->u.emerg.code = s390int->parm; 1507 break; 1508 case KVM_S390_MCHK: 1509 irq->u.mchk.mcic = s390int->parm64; 1510 break; 1511 } 1512 return 0; 1513 } 1514 1515 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu) 1516 { 1517 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1518 1519 return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs); 1520 } 1521 1522 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu) 1523 { 1524 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1525 1526 spin_lock(&li->lock); 1527 li->irq.stop.flags = 0; 1528 clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs); 1529 spin_unlock(&li->lock); 1530 } 1531 1532 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 1533 { 1534 int rc; 1535 1536 switch (irq->type) { 1537 case KVM_S390_PROGRAM_INT: 1538 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)", 1539 irq->u.pgm.code); 1540 rc = __inject_prog(vcpu, irq); 1541 break; 1542 case KVM_S390_SIGP_SET_PREFIX: 1543 rc = __inject_set_prefix(vcpu, irq); 1544 break; 1545 case KVM_S390_SIGP_STOP: 1546 rc = __inject_sigp_stop(vcpu, irq); 1547 break; 1548 case KVM_S390_RESTART: 1549 rc = __inject_sigp_restart(vcpu, irq); 1550 break; 1551 case KVM_S390_INT_CLOCK_COMP: 1552 rc = __inject_ckc(vcpu); 1553 break; 1554 case KVM_S390_INT_CPU_TIMER: 1555 rc = __inject_cpu_timer(vcpu); 1556 break; 1557 case KVM_S390_INT_EXTERNAL_CALL: 1558 rc = __inject_extcall(vcpu, irq); 1559 break; 1560 case KVM_S390_INT_EMERGENCY: 1561 rc = __inject_sigp_emergency(vcpu, irq); 1562 break; 1563 case KVM_S390_MCHK: 1564 rc = __inject_mchk(vcpu, irq); 1565 break; 1566 case KVM_S390_INT_PFAULT_INIT: 1567 rc = __inject_pfault_init(vcpu, irq); 1568 break; 1569 case KVM_S390_INT_VIRTIO: 1570 case KVM_S390_INT_SERVICE: 1571 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 1572 default: 1573 rc = -EINVAL; 1574 } 1575 1576 return rc; 1577 } 1578 1579 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 1580 { 1581 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1582 int rc; 1583 1584 spin_lock(&li->lock); 1585 rc = do_inject_vcpu(vcpu, irq); 1586 spin_unlock(&li->lock); 1587 if (!rc) 1588 kvm_s390_vcpu_wakeup(vcpu); 1589 return rc; 1590 } 1591 1592 static inline void clear_irq_list(struct list_head *_list) 1593 { 1594 struct kvm_s390_interrupt_info *inti, *n; 1595 1596 list_for_each_entry_safe(inti, n, _list, list) { 1597 list_del(&inti->list); 1598 kfree(inti); 1599 } 1600 } 1601 1602 static void inti_to_irq(struct kvm_s390_interrupt_info *inti, 1603 struct kvm_s390_irq *irq) 1604 { 1605 irq->type = inti->type; 1606 switch (inti->type) { 1607 case KVM_S390_INT_PFAULT_INIT: 1608 case KVM_S390_INT_PFAULT_DONE: 1609 case KVM_S390_INT_VIRTIO: 1610 irq->u.ext = inti->ext; 1611 break; 1612 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 1613 irq->u.io = inti->io; 1614 break; 1615 } 1616 } 1617 1618 void kvm_s390_clear_float_irqs(struct kvm *kvm) 1619 { 1620 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; 1621 int i; 1622 1623 spin_lock(&fi->lock); 1624 fi->pending_irqs = 0; 1625 memset(&fi->srv_signal, 0, sizeof(fi->srv_signal)); 1626 memset(&fi->mchk, 0, sizeof(fi->mchk)); 1627 for (i = 0; i < FIRQ_LIST_COUNT; i++) 1628 clear_irq_list(&fi->lists[i]); 1629 for (i = 0; i < FIRQ_MAX_COUNT; i++) 1630 fi->counters[i] = 0; 1631 spin_unlock(&fi->lock); 1632 }; 1633 1634 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len) 1635 { 1636 struct kvm_s390_interrupt_info *inti; 1637 struct kvm_s390_float_interrupt *fi; 1638 struct kvm_s390_irq *buf; 1639 struct kvm_s390_irq *irq; 1640 int max_irqs; 1641 int ret = 0; 1642 int n = 0; 1643 int i; 1644 1645 if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0) 1646 return -EINVAL; 1647 1648 /* 1649 * We are already using -ENOMEM to signal 1650 * userspace it may retry with a bigger buffer, 1651 * so we need to use something else for this case 1652 */ 1653 buf = vzalloc(len); 1654 if (!buf) 1655 return -ENOBUFS; 1656 1657 max_irqs = len / sizeof(struct kvm_s390_irq); 1658 1659 fi = &kvm->arch.float_int; 1660 spin_lock(&fi->lock); 1661 for (i = 0; i < FIRQ_LIST_COUNT; i++) { 1662 list_for_each_entry(inti, &fi->lists[i], list) { 1663 if (n == max_irqs) { 1664 /* signal userspace to try again */ 1665 ret = -ENOMEM; 1666 goto out; 1667 } 1668 inti_to_irq(inti, &buf[n]); 1669 n++; 1670 } 1671 } 1672 if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) { 1673 if (n == max_irqs) { 1674 /* signal userspace to try again */ 1675 ret = -ENOMEM; 1676 goto out; 1677 } 1678 irq = (struct kvm_s390_irq *) &buf[n]; 1679 irq->type = KVM_S390_INT_SERVICE; 1680 irq->u.ext = fi->srv_signal; 1681 n++; 1682 } 1683 if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) { 1684 if (n == max_irqs) { 1685 /* signal userspace to try again */ 1686 ret = -ENOMEM; 1687 goto out; 1688 } 1689 irq = (struct kvm_s390_irq *) &buf[n]; 1690 irq->type = KVM_S390_MCHK; 1691 irq->u.mchk = fi->mchk; 1692 n++; 1693 } 1694 1695 out: 1696 spin_unlock(&fi->lock); 1697 if (!ret && n > 0) { 1698 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n)) 1699 ret = -EFAULT; 1700 } 1701 vfree(buf); 1702 1703 return ret < 0 ? ret : n; 1704 } 1705 1706 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr) 1707 { 1708 int r; 1709 1710 switch (attr->group) { 1711 case KVM_DEV_FLIC_GET_ALL_IRQS: 1712 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr, 1713 attr->attr); 1714 break; 1715 default: 1716 r = -EINVAL; 1717 } 1718 1719 return r; 1720 } 1721 1722 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti, 1723 u64 addr) 1724 { 1725 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr; 1726 void *target = NULL; 1727 void __user *source; 1728 u64 size; 1729 1730 if (get_user(inti->type, (u64 __user *)addr)) 1731 return -EFAULT; 1732 1733 switch (inti->type) { 1734 case KVM_S390_INT_PFAULT_INIT: 1735 case KVM_S390_INT_PFAULT_DONE: 1736 case KVM_S390_INT_VIRTIO: 1737 case KVM_S390_INT_SERVICE: 1738 target = (void *) &inti->ext; 1739 source = &uptr->u.ext; 1740 size = sizeof(inti->ext); 1741 break; 1742 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 1743 target = (void *) &inti->io; 1744 source = &uptr->u.io; 1745 size = sizeof(inti->io); 1746 break; 1747 case KVM_S390_MCHK: 1748 target = (void *) &inti->mchk; 1749 source = &uptr->u.mchk; 1750 size = sizeof(inti->mchk); 1751 break; 1752 default: 1753 return -EINVAL; 1754 } 1755 1756 if (copy_from_user(target, source, size)) 1757 return -EFAULT; 1758 1759 return 0; 1760 } 1761 1762 static int enqueue_floating_irq(struct kvm_device *dev, 1763 struct kvm_device_attr *attr) 1764 { 1765 struct kvm_s390_interrupt_info *inti = NULL; 1766 int r = 0; 1767 int len = attr->attr; 1768 1769 if (len % sizeof(struct kvm_s390_irq) != 0) 1770 return -EINVAL; 1771 else if (len > KVM_S390_FLIC_MAX_BUFFER) 1772 return -EINVAL; 1773 1774 while (len >= sizeof(struct kvm_s390_irq)) { 1775 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 1776 if (!inti) 1777 return -ENOMEM; 1778 1779 r = copy_irq_from_user(inti, attr->addr); 1780 if (r) { 1781 kfree(inti); 1782 return r; 1783 } 1784 r = __inject_vm(dev->kvm, inti); 1785 if (r) { 1786 kfree(inti); 1787 return r; 1788 } 1789 len -= sizeof(struct kvm_s390_irq); 1790 attr->addr += sizeof(struct kvm_s390_irq); 1791 } 1792 1793 return r; 1794 } 1795 1796 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id) 1797 { 1798 if (id >= MAX_S390_IO_ADAPTERS) 1799 return NULL; 1800 return kvm->arch.adapters[id]; 1801 } 1802 1803 static int register_io_adapter(struct kvm_device *dev, 1804 struct kvm_device_attr *attr) 1805 { 1806 struct s390_io_adapter *adapter; 1807 struct kvm_s390_io_adapter adapter_info; 1808 1809 if (copy_from_user(&adapter_info, 1810 (void __user *)attr->addr, sizeof(adapter_info))) 1811 return -EFAULT; 1812 1813 if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) || 1814 (dev->kvm->arch.adapters[adapter_info.id] != NULL)) 1815 return -EINVAL; 1816 1817 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL); 1818 if (!adapter) 1819 return -ENOMEM; 1820 1821 INIT_LIST_HEAD(&adapter->maps); 1822 init_rwsem(&adapter->maps_lock); 1823 atomic_set(&adapter->nr_maps, 0); 1824 adapter->id = adapter_info.id; 1825 adapter->isc = adapter_info.isc; 1826 adapter->maskable = adapter_info.maskable; 1827 adapter->masked = false; 1828 adapter->swap = adapter_info.swap; 1829 dev->kvm->arch.adapters[adapter->id] = adapter; 1830 1831 return 0; 1832 } 1833 1834 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked) 1835 { 1836 int ret; 1837 struct s390_io_adapter *adapter = get_io_adapter(kvm, id); 1838 1839 if (!adapter || !adapter->maskable) 1840 return -EINVAL; 1841 ret = adapter->masked; 1842 adapter->masked = masked; 1843 return ret; 1844 } 1845 1846 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr) 1847 { 1848 struct s390_io_adapter *adapter = get_io_adapter(kvm, id); 1849 struct s390_map_info *map; 1850 int ret; 1851 1852 if (!adapter || !addr) 1853 return -EINVAL; 1854 1855 map = kzalloc(sizeof(*map), GFP_KERNEL); 1856 if (!map) { 1857 ret = -ENOMEM; 1858 goto out; 1859 } 1860 INIT_LIST_HEAD(&map->list); 1861 map->guest_addr = addr; 1862 map->addr = gmap_translate(kvm->arch.gmap, addr); 1863 if (map->addr == -EFAULT) { 1864 ret = -EFAULT; 1865 goto out; 1866 } 1867 ret = get_user_pages_fast(map->addr, 1, 1, &map->page); 1868 if (ret < 0) 1869 goto out; 1870 BUG_ON(ret != 1); 1871 down_write(&adapter->maps_lock); 1872 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) { 1873 list_add_tail(&map->list, &adapter->maps); 1874 ret = 0; 1875 } else { 1876 put_page(map->page); 1877 ret = -EINVAL; 1878 } 1879 up_write(&adapter->maps_lock); 1880 out: 1881 if (ret) 1882 kfree(map); 1883 return ret; 1884 } 1885 1886 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr) 1887 { 1888 struct s390_io_adapter *adapter = get_io_adapter(kvm, id); 1889 struct s390_map_info *map, *tmp; 1890 int found = 0; 1891 1892 if (!adapter || !addr) 1893 return -EINVAL; 1894 1895 down_write(&adapter->maps_lock); 1896 list_for_each_entry_safe(map, tmp, &adapter->maps, list) { 1897 if (map->guest_addr == addr) { 1898 found = 1; 1899 atomic_dec(&adapter->nr_maps); 1900 list_del(&map->list); 1901 put_page(map->page); 1902 kfree(map); 1903 break; 1904 } 1905 } 1906 up_write(&adapter->maps_lock); 1907 1908 return found ? 0 : -EINVAL; 1909 } 1910 1911 void kvm_s390_destroy_adapters(struct kvm *kvm) 1912 { 1913 int i; 1914 struct s390_map_info *map, *tmp; 1915 1916 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) { 1917 if (!kvm->arch.adapters[i]) 1918 continue; 1919 list_for_each_entry_safe(map, tmp, 1920 &kvm->arch.adapters[i]->maps, list) { 1921 list_del(&map->list); 1922 put_page(map->page); 1923 kfree(map); 1924 } 1925 kfree(kvm->arch.adapters[i]); 1926 } 1927 } 1928 1929 static int modify_io_adapter(struct kvm_device *dev, 1930 struct kvm_device_attr *attr) 1931 { 1932 struct kvm_s390_io_adapter_req req; 1933 struct s390_io_adapter *adapter; 1934 int ret; 1935 1936 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req))) 1937 return -EFAULT; 1938 1939 adapter = get_io_adapter(dev->kvm, req.id); 1940 if (!adapter) 1941 return -EINVAL; 1942 switch (req.type) { 1943 case KVM_S390_IO_ADAPTER_MASK: 1944 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask); 1945 if (ret > 0) 1946 ret = 0; 1947 break; 1948 case KVM_S390_IO_ADAPTER_MAP: 1949 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr); 1950 break; 1951 case KVM_S390_IO_ADAPTER_UNMAP: 1952 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr); 1953 break; 1954 default: 1955 ret = -EINVAL; 1956 } 1957 1958 return ret; 1959 } 1960 1961 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr) 1962 { 1963 int r = 0; 1964 unsigned int i; 1965 struct kvm_vcpu *vcpu; 1966 1967 switch (attr->group) { 1968 case KVM_DEV_FLIC_ENQUEUE: 1969 r = enqueue_floating_irq(dev, attr); 1970 break; 1971 case KVM_DEV_FLIC_CLEAR_IRQS: 1972 kvm_s390_clear_float_irqs(dev->kvm); 1973 break; 1974 case KVM_DEV_FLIC_APF_ENABLE: 1975 dev->kvm->arch.gmap->pfault_enabled = 1; 1976 break; 1977 case KVM_DEV_FLIC_APF_DISABLE_WAIT: 1978 dev->kvm->arch.gmap->pfault_enabled = 0; 1979 /* 1980 * Make sure no async faults are in transition when 1981 * clearing the queues. So we don't need to worry 1982 * about late coming workers. 1983 */ 1984 synchronize_srcu(&dev->kvm->srcu); 1985 kvm_for_each_vcpu(i, vcpu, dev->kvm) 1986 kvm_clear_async_pf_completion_queue(vcpu); 1987 break; 1988 case KVM_DEV_FLIC_ADAPTER_REGISTER: 1989 r = register_io_adapter(dev, attr); 1990 break; 1991 case KVM_DEV_FLIC_ADAPTER_MODIFY: 1992 r = modify_io_adapter(dev, attr); 1993 break; 1994 default: 1995 r = -EINVAL; 1996 } 1997 1998 return r; 1999 } 2000 2001 static int flic_create(struct kvm_device *dev, u32 type) 2002 { 2003 if (!dev) 2004 return -EINVAL; 2005 if (dev->kvm->arch.flic) 2006 return -EINVAL; 2007 dev->kvm->arch.flic = dev; 2008 return 0; 2009 } 2010 2011 static void flic_destroy(struct kvm_device *dev) 2012 { 2013 dev->kvm->arch.flic = NULL; 2014 kfree(dev); 2015 } 2016 2017 /* s390 floating irq controller (flic) */ 2018 struct kvm_device_ops kvm_flic_ops = { 2019 .name = "kvm-flic", 2020 .get_attr = flic_get_attr, 2021 .set_attr = flic_set_attr, 2022 .create = flic_create, 2023 .destroy = flic_destroy, 2024 }; 2025 2026 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap) 2027 { 2028 unsigned long bit; 2029 2030 bit = bit_nr + (addr % PAGE_SIZE) * 8; 2031 2032 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit; 2033 } 2034 2035 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter, 2036 u64 addr) 2037 { 2038 struct s390_map_info *map; 2039 2040 if (!adapter) 2041 return NULL; 2042 2043 list_for_each_entry(map, &adapter->maps, list) { 2044 if (map->guest_addr == addr) 2045 return map; 2046 } 2047 return NULL; 2048 } 2049 2050 static int adapter_indicators_set(struct kvm *kvm, 2051 struct s390_io_adapter *adapter, 2052 struct kvm_s390_adapter_int *adapter_int) 2053 { 2054 unsigned long bit; 2055 int summary_set, idx; 2056 struct s390_map_info *info; 2057 void *map; 2058 2059 info = get_map_info(adapter, adapter_int->ind_addr); 2060 if (!info) 2061 return -1; 2062 map = page_address(info->page); 2063 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap); 2064 set_bit(bit, map); 2065 idx = srcu_read_lock(&kvm->srcu); 2066 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT); 2067 set_page_dirty_lock(info->page); 2068 info = get_map_info(adapter, adapter_int->summary_addr); 2069 if (!info) { 2070 srcu_read_unlock(&kvm->srcu, idx); 2071 return -1; 2072 } 2073 map = page_address(info->page); 2074 bit = get_ind_bit(info->addr, adapter_int->summary_offset, 2075 adapter->swap); 2076 summary_set = test_and_set_bit(bit, map); 2077 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT); 2078 set_page_dirty_lock(info->page); 2079 srcu_read_unlock(&kvm->srcu, idx); 2080 return summary_set ? 0 : 1; 2081 } 2082 2083 /* 2084 * < 0 - not injected due to error 2085 * = 0 - coalesced, summary indicator already active 2086 * > 0 - injected interrupt 2087 */ 2088 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e, 2089 struct kvm *kvm, int irq_source_id, int level, 2090 bool line_status) 2091 { 2092 int ret; 2093 struct s390_io_adapter *adapter; 2094 2095 /* We're only interested in the 0->1 transition. */ 2096 if (!level) 2097 return 0; 2098 adapter = get_io_adapter(kvm, e->adapter.adapter_id); 2099 if (!adapter) 2100 return -1; 2101 down_read(&adapter->maps_lock); 2102 ret = adapter_indicators_set(kvm, adapter, &e->adapter); 2103 up_read(&adapter->maps_lock); 2104 if ((ret > 0) && !adapter->masked) { 2105 struct kvm_s390_interrupt s390int = { 2106 .type = KVM_S390_INT_IO(1, 0, 0, 0), 2107 .parm = 0, 2108 .parm64 = (adapter->isc << 27) | 0x80000000, 2109 }; 2110 ret = kvm_s390_inject_vm(kvm, &s390int); 2111 if (ret == 0) 2112 ret = 1; 2113 } 2114 return ret; 2115 } 2116 2117 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e, 2118 const struct kvm_irq_routing_entry *ue) 2119 { 2120 int ret; 2121 2122 switch (ue->type) { 2123 case KVM_IRQ_ROUTING_S390_ADAPTER: 2124 e->set = set_adapter_int; 2125 e->adapter.summary_addr = ue->u.adapter.summary_addr; 2126 e->adapter.ind_addr = ue->u.adapter.ind_addr; 2127 e->adapter.summary_offset = ue->u.adapter.summary_offset; 2128 e->adapter.ind_offset = ue->u.adapter.ind_offset; 2129 e->adapter.adapter_id = ue->u.adapter.adapter_id; 2130 ret = 0; 2131 break; 2132 default: 2133 ret = -EINVAL; 2134 } 2135 2136 return ret; 2137 } 2138 2139 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm, 2140 int irq_source_id, int level, bool line_status) 2141 { 2142 return -EINVAL; 2143 } 2144 2145 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len) 2146 { 2147 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 2148 struct kvm_s390_irq *buf; 2149 int r = 0; 2150 int n; 2151 2152 buf = vmalloc(len); 2153 if (!buf) 2154 return -ENOMEM; 2155 2156 if (copy_from_user((void *) buf, irqstate, len)) { 2157 r = -EFAULT; 2158 goto out_free; 2159 } 2160 2161 /* 2162 * Don't allow setting the interrupt state 2163 * when there are already interrupts pending 2164 */ 2165 spin_lock(&li->lock); 2166 if (li->pending_irqs) { 2167 r = -EBUSY; 2168 goto out_unlock; 2169 } 2170 2171 for (n = 0; n < len / sizeof(*buf); n++) { 2172 r = do_inject_vcpu(vcpu, &buf[n]); 2173 if (r) 2174 break; 2175 } 2176 2177 out_unlock: 2178 spin_unlock(&li->lock); 2179 out_free: 2180 vfree(buf); 2181 2182 return r; 2183 } 2184 2185 static void store_local_irq(struct kvm_s390_local_interrupt *li, 2186 struct kvm_s390_irq *irq, 2187 unsigned long irq_type) 2188 { 2189 switch (irq_type) { 2190 case IRQ_PEND_MCHK_EX: 2191 case IRQ_PEND_MCHK_REP: 2192 irq->type = KVM_S390_MCHK; 2193 irq->u.mchk = li->irq.mchk; 2194 break; 2195 case IRQ_PEND_PROG: 2196 irq->type = KVM_S390_PROGRAM_INT; 2197 irq->u.pgm = li->irq.pgm; 2198 break; 2199 case IRQ_PEND_PFAULT_INIT: 2200 irq->type = KVM_S390_INT_PFAULT_INIT; 2201 irq->u.ext = li->irq.ext; 2202 break; 2203 case IRQ_PEND_EXT_EXTERNAL: 2204 irq->type = KVM_S390_INT_EXTERNAL_CALL; 2205 irq->u.extcall = li->irq.extcall; 2206 break; 2207 case IRQ_PEND_EXT_CLOCK_COMP: 2208 irq->type = KVM_S390_INT_CLOCK_COMP; 2209 break; 2210 case IRQ_PEND_EXT_CPU_TIMER: 2211 irq->type = KVM_S390_INT_CPU_TIMER; 2212 break; 2213 case IRQ_PEND_SIGP_STOP: 2214 irq->type = KVM_S390_SIGP_STOP; 2215 irq->u.stop = li->irq.stop; 2216 break; 2217 case IRQ_PEND_RESTART: 2218 irq->type = KVM_S390_RESTART; 2219 break; 2220 case IRQ_PEND_SET_PREFIX: 2221 irq->type = KVM_S390_SIGP_SET_PREFIX; 2222 irq->u.prefix = li->irq.prefix; 2223 break; 2224 } 2225 } 2226 2227 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len) 2228 { 2229 uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl; 2230 unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)]; 2231 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 2232 unsigned long pending_irqs; 2233 struct kvm_s390_irq irq; 2234 unsigned long irq_type; 2235 int cpuaddr; 2236 int n = 0; 2237 2238 spin_lock(&li->lock); 2239 pending_irqs = li->pending_irqs; 2240 memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending, 2241 sizeof(sigp_emerg_pending)); 2242 spin_unlock(&li->lock); 2243 2244 for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) { 2245 memset(&irq, 0, sizeof(irq)); 2246 if (irq_type == IRQ_PEND_EXT_EMERGENCY) 2247 continue; 2248 if (n + sizeof(irq) > len) 2249 return -ENOBUFS; 2250 store_local_irq(&vcpu->arch.local_int, &irq, irq_type); 2251 if (copy_to_user(&buf[n], &irq, sizeof(irq))) 2252 return -EFAULT; 2253 n += sizeof(irq); 2254 } 2255 2256 if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) { 2257 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) { 2258 memset(&irq, 0, sizeof(irq)); 2259 if (n + sizeof(irq) > len) 2260 return -ENOBUFS; 2261 irq.type = KVM_S390_INT_EMERGENCY; 2262 irq.u.emerg.code = cpuaddr; 2263 if (copy_to_user(&buf[n], &irq, sizeof(irq))) 2264 return -EFAULT; 2265 n += sizeof(irq); 2266 } 2267 } 2268 2269 if ((sigp_ctrl & SIGP_CTRL_C) && 2270 (atomic_read(&vcpu->arch.sie_block->cpuflags) & 2271 CPUSTAT_ECALL_PEND)) { 2272 if (n + sizeof(irq) > len) 2273 return -ENOBUFS; 2274 memset(&irq, 0, sizeof(irq)); 2275 irq.type = KVM_S390_INT_EXTERNAL_CALL; 2276 irq.u.extcall.code = sigp_ctrl & SIGP_CTRL_SCN_MASK; 2277 if (copy_to_user(&buf[n], &irq, sizeof(irq))) 2278 return -EFAULT; 2279 n += sizeof(irq); 2280 } 2281 2282 return n; 2283 } 2284