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