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 <asm/gmap.h> 27 #include "kvm-s390.h" 28 #include "gaccess.h" 29 #include "trace-s390.h" 30 31 #define IOINT_SCHID_MASK 0x0000ffff 32 #define IOINT_SSID_MASK 0x00030000 33 #define IOINT_CSSID_MASK 0x03fc0000 34 #define PFAULT_INIT 0x0600 35 #define PFAULT_DONE 0x0680 36 #define VIRTIO_PARAM 0x0d00 37 38 /* handle external calls via sigp interpretation facility */ 39 static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id) 40 { 41 int c, scn; 42 43 if (!(atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND)) 44 return 0; 45 46 read_lock(&vcpu->kvm->arch.sca_lock); 47 if (vcpu->kvm->arch.use_esca) { 48 struct esca_block *sca = vcpu->kvm->arch.sca; 49 union esca_sigp_ctrl sigp_ctrl = 50 sca->cpu[vcpu->vcpu_id].sigp_ctrl; 51 52 c = sigp_ctrl.c; 53 scn = sigp_ctrl.scn; 54 } else { 55 struct bsca_block *sca = vcpu->kvm->arch.sca; 56 union bsca_sigp_ctrl sigp_ctrl = 57 sca->cpu[vcpu->vcpu_id].sigp_ctrl; 58 59 c = sigp_ctrl.c; 60 scn = sigp_ctrl.scn; 61 } 62 read_unlock(&vcpu->kvm->arch.sca_lock); 63 64 if (src_id) 65 *src_id = scn; 66 67 return c; 68 } 69 70 static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id) 71 { 72 int expect, rc; 73 74 read_lock(&vcpu->kvm->arch.sca_lock); 75 if (vcpu->kvm->arch.use_esca) { 76 struct esca_block *sca = vcpu->kvm->arch.sca; 77 union esca_sigp_ctrl *sigp_ctrl = 78 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl); 79 union esca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl; 80 81 new_val.scn = src_id; 82 new_val.c = 1; 83 old_val.c = 0; 84 85 expect = old_val.value; 86 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value); 87 } else { 88 struct bsca_block *sca = vcpu->kvm->arch.sca; 89 union bsca_sigp_ctrl *sigp_ctrl = 90 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl); 91 union bsca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl; 92 93 new_val.scn = src_id; 94 new_val.c = 1; 95 old_val.c = 0; 96 97 expect = old_val.value; 98 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value); 99 } 100 read_unlock(&vcpu->kvm->arch.sca_lock); 101 102 if (rc != expect) { 103 /* another external call is pending */ 104 return -EBUSY; 105 } 106 atomic_or(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags); 107 return 0; 108 } 109 110 static void sca_clear_ext_call(struct kvm_vcpu *vcpu) 111 { 112 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 113 int rc, expect; 114 115 atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags); 116 read_lock(&vcpu->kvm->arch.sca_lock); 117 if (vcpu->kvm->arch.use_esca) { 118 struct esca_block *sca = vcpu->kvm->arch.sca; 119 union esca_sigp_ctrl *sigp_ctrl = 120 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl); 121 union esca_sigp_ctrl old = *sigp_ctrl; 122 123 expect = old.value; 124 rc = cmpxchg(&sigp_ctrl->value, old.value, 0); 125 } else { 126 struct bsca_block *sca = vcpu->kvm->arch.sca; 127 union bsca_sigp_ctrl *sigp_ctrl = 128 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl); 129 union bsca_sigp_ctrl old = *sigp_ctrl; 130 131 expect = old.value; 132 rc = cmpxchg(&sigp_ctrl->value, old.value, 0); 133 } 134 read_unlock(&vcpu->kvm->arch.sca_lock); 135 WARN_ON(rc != expect); /* cannot clear? */ 136 } 137 138 int psw_extint_disabled(struct kvm_vcpu *vcpu) 139 { 140 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT); 141 } 142 143 static int psw_ioint_disabled(struct kvm_vcpu *vcpu) 144 { 145 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO); 146 } 147 148 static int psw_mchk_disabled(struct kvm_vcpu *vcpu) 149 { 150 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK); 151 } 152 153 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu) 154 { 155 return psw_extint_disabled(vcpu) && 156 psw_ioint_disabled(vcpu) && 157 psw_mchk_disabled(vcpu); 158 } 159 160 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu) 161 { 162 if (psw_extint_disabled(vcpu) || 163 !(vcpu->arch.sie_block->gcr[0] & 0x800ul)) 164 return 0; 165 if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu)) 166 /* No timer interrupts when single stepping */ 167 return 0; 168 return 1; 169 } 170 171 static int ckc_irq_pending(struct kvm_vcpu *vcpu) 172 { 173 if (vcpu->arch.sie_block->ckc >= kvm_s390_get_tod_clock_fast(vcpu->kvm)) 174 return 0; 175 return ckc_interrupts_enabled(vcpu); 176 } 177 178 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu) 179 { 180 return !psw_extint_disabled(vcpu) && 181 (vcpu->arch.sie_block->gcr[0] & 0x400ul); 182 } 183 184 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu) 185 { 186 if (!cpu_timer_interrupts_enabled(vcpu)) 187 return 0; 188 return kvm_s390_get_cpu_timer(vcpu) >> 63; 189 } 190 191 static inline int is_ioirq(unsigned long irq_type) 192 { 193 return ((irq_type >= IRQ_PEND_IO_ISC_0) && 194 (irq_type <= IRQ_PEND_IO_ISC_7)); 195 } 196 197 static uint64_t isc_to_isc_bits(int isc) 198 { 199 return (0x80 >> isc) << 24; 200 } 201 202 static inline u8 int_word_to_isc(u32 int_word) 203 { 204 return (int_word & 0x38000000) >> 27; 205 } 206 207 static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu) 208 { 209 return vcpu->kvm->arch.float_int.pending_irqs | 210 vcpu->arch.local_int.pending_irqs; 211 } 212 213 static unsigned long disable_iscs(struct kvm_vcpu *vcpu, 214 unsigned long active_mask) 215 { 216 int i; 217 218 for (i = 0; i <= MAX_ISC; i++) 219 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i))) 220 active_mask &= ~(1UL << (IRQ_PEND_IO_ISC_0 + i)); 221 222 return active_mask; 223 } 224 225 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu) 226 { 227 unsigned long active_mask; 228 229 active_mask = pending_irqs(vcpu); 230 if (!active_mask) 231 return 0; 232 233 if (psw_extint_disabled(vcpu)) 234 active_mask &= ~IRQ_PEND_EXT_MASK; 235 if (psw_ioint_disabled(vcpu)) 236 active_mask &= ~IRQ_PEND_IO_MASK; 237 else 238 active_mask = disable_iscs(vcpu, active_mask); 239 if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul)) 240 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask); 241 if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul)) 242 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask); 243 if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul)) 244 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask); 245 if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul)) 246 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask); 247 if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul)) 248 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask); 249 if (psw_mchk_disabled(vcpu)) 250 active_mask &= ~IRQ_PEND_MCHK_MASK; 251 if (!(vcpu->arch.sie_block->gcr[14] & 252 vcpu->kvm->arch.float_int.mchk.cr14)) 253 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask); 254 255 /* 256 * STOP irqs will never be actively delivered. They are triggered via 257 * intercept requests and cleared when the stop intercept is performed. 258 */ 259 __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask); 260 261 return active_mask; 262 } 263 264 static void __set_cpu_idle(struct kvm_vcpu *vcpu) 265 { 266 atomic_or(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags); 267 set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask); 268 } 269 270 static void __unset_cpu_idle(struct kvm_vcpu *vcpu) 271 { 272 atomic_andnot(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags); 273 clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask); 274 } 275 276 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu) 277 { 278 atomic_andnot(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT, 279 &vcpu->arch.sie_block->cpuflags); 280 vcpu->arch.sie_block->lctl = 0x0000; 281 vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT); 282 283 if (guestdbg_enabled(vcpu)) { 284 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 | 285 LCTL_CR10 | LCTL_CR11); 286 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT); 287 } 288 } 289 290 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag) 291 { 292 atomic_or(flag, &vcpu->arch.sie_block->cpuflags); 293 } 294 295 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu) 296 { 297 if (!(pending_irqs(vcpu) & IRQ_PEND_IO_MASK)) 298 return; 299 else if (psw_ioint_disabled(vcpu)) 300 __set_cpuflag(vcpu, CPUSTAT_IO_INT); 301 else 302 vcpu->arch.sie_block->lctl |= LCTL_CR6; 303 } 304 305 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu) 306 { 307 if (!(pending_irqs(vcpu) & IRQ_PEND_EXT_MASK)) 308 return; 309 if (psw_extint_disabled(vcpu)) 310 __set_cpuflag(vcpu, CPUSTAT_EXT_INT); 311 else 312 vcpu->arch.sie_block->lctl |= LCTL_CR0; 313 } 314 315 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu) 316 { 317 if (!(pending_irqs(vcpu) & IRQ_PEND_MCHK_MASK)) 318 return; 319 if (psw_mchk_disabled(vcpu)) 320 vcpu->arch.sie_block->ictl |= ICTL_LPSW; 321 else 322 vcpu->arch.sie_block->lctl |= LCTL_CR14; 323 } 324 325 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu) 326 { 327 if (kvm_s390_is_stop_irq_pending(vcpu)) 328 __set_cpuflag(vcpu, CPUSTAT_STOP_INT); 329 } 330 331 /* Set interception request for non-deliverable interrupts */ 332 static void set_intercept_indicators(struct kvm_vcpu *vcpu) 333 { 334 set_intercept_indicators_io(vcpu); 335 set_intercept_indicators_ext(vcpu); 336 set_intercept_indicators_mchk(vcpu); 337 set_intercept_indicators_stop(vcpu); 338 } 339 340 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu) 341 { 342 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 343 int rc; 344 345 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER, 346 0, 0); 347 348 rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER, 349 (u16 *)__LC_EXT_INT_CODE); 350 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR); 351 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 352 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 353 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 354 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 355 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs); 356 return rc ? -EFAULT : 0; 357 } 358 359 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu) 360 { 361 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 362 int rc; 363 364 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP, 365 0, 0); 366 367 rc = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP, 368 (u16 __user *)__LC_EXT_INT_CODE); 369 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR); 370 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 371 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 372 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 373 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 374 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs); 375 return rc ? -EFAULT : 0; 376 } 377 378 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu) 379 { 380 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 381 struct kvm_s390_ext_info ext; 382 int rc; 383 384 spin_lock(&li->lock); 385 ext = li->irq.ext; 386 clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs); 387 li->irq.ext.ext_params2 = 0; 388 spin_unlock(&li->lock); 389 390 VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx", 391 ext.ext_params2); 392 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, 393 KVM_S390_INT_PFAULT_INIT, 394 0, ext.ext_params2); 395 396 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE); 397 rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR); 398 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 399 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 400 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 401 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 402 rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2); 403 return rc ? -EFAULT : 0; 404 } 405 406 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu) 407 { 408 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 409 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 410 struct kvm_s390_mchk_info mchk = {}; 411 unsigned long adtl_status_addr; 412 int deliver = 0; 413 int rc = 0; 414 415 spin_lock(&fi->lock); 416 spin_lock(&li->lock); 417 if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) || 418 test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) { 419 /* 420 * If there was an exigent machine check pending, then any 421 * repressible machine checks that might have been pending 422 * are indicated along with it, so always clear bits for 423 * repressible and exigent interrupts 424 */ 425 mchk = li->irq.mchk; 426 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs); 427 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs); 428 memset(&li->irq.mchk, 0, sizeof(mchk)); 429 deliver = 1; 430 } 431 /* 432 * We indicate floating repressible conditions along with 433 * other pending conditions. Channel Report Pending and Channel 434 * Subsystem damage are the only two and and are indicated by 435 * bits in mcic and masked in cr14. 436 */ 437 if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) { 438 mchk.mcic |= fi->mchk.mcic; 439 mchk.cr14 |= fi->mchk.cr14; 440 memset(&fi->mchk, 0, sizeof(mchk)); 441 deliver = 1; 442 } 443 spin_unlock(&li->lock); 444 spin_unlock(&fi->lock); 445 446 if (deliver) { 447 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx", 448 mchk.mcic); 449 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, 450 KVM_S390_MCHK, 451 mchk.cr14, mchk.mcic); 452 453 rc = kvm_s390_vcpu_store_status(vcpu, 454 KVM_S390_STORE_STATUS_PREFIXED); 455 rc |= read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR, 456 &adtl_status_addr, 457 sizeof(unsigned long)); 458 rc |= kvm_s390_vcpu_store_adtl_status(vcpu, 459 adtl_status_addr); 460 rc |= put_guest_lc(vcpu, mchk.mcic, 461 (u64 __user *) __LC_MCCK_CODE); 462 rc |= put_guest_lc(vcpu, mchk.failing_storage_address, 463 (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR); 464 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA, 465 &mchk.fixed_logout, 466 sizeof(mchk.fixed_logout)); 467 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW, 468 &vcpu->arch.sie_block->gpsw, 469 sizeof(psw_t)); 470 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW, 471 &vcpu->arch.sie_block->gpsw, 472 sizeof(psw_t)); 473 } 474 return rc ? -EFAULT : 0; 475 } 476 477 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu) 478 { 479 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 480 int rc; 481 482 VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart"); 483 vcpu->stat.deliver_restart_signal++; 484 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0); 485 486 rc = write_guest_lc(vcpu, 487 offsetof(struct lowcore, restart_old_psw), 488 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 489 rc |= read_guest_lc(vcpu, offsetof(struct lowcore, restart_psw), 490 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 491 clear_bit(IRQ_PEND_RESTART, &li->pending_irqs); 492 return rc ? -EFAULT : 0; 493 } 494 495 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu) 496 { 497 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 498 struct kvm_s390_prefix_info prefix; 499 500 spin_lock(&li->lock); 501 prefix = li->irq.prefix; 502 li->irq.prefix.address = 0; 503 clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs); 504 spin_unlock(&li->lock); 505 506 vcpu->stat.deliver_prefix_signal++; 507 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, 508 KVM_S390_SIGP_SET_PREFIX, 509 prefix.address, 0); 510 511 kvm_s390_set_prefix(vcpu, prefix.address); 512 return 0; 513 } 514 515 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu) 516 { 517 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 518 int rc; 519 int cpu_addr; 520 521 spin_lock(&li->lock); 522 cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS); 523 clear_bit(cpu_addr, li->sigp_emerg_pending); 524 if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS)) 525 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs); 526 spin_unlock(&li->lock); 527 528 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg"); 529 vcpu->stat.deliver_emergency_signal++; 530 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY, 531 cpu_addr, 0); 532 533 rc = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG, 534 (u16 *)__LC_EXT_INT_CODE); 535 rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR); 536 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 537 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 538 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 539 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 540 return rc ? -EFAULT : 0; 541 } 542 543 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu) 544 { 545 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 546 struct kvm_s390_extcall_info extcall; 547 int rc; 548 549 spin_lock(&li->lock); 550 extcall = li->irq.extcall; 551 li->irq.extcall.code = 0; 552 clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs); 553 spin_unlock(&li->lock); 554 555 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call"); 556 vcpu->stat.deliver_external_call++; 557 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, 558 KVM_S390_INT_EXTERNAL_CALL, 559 extcall.code, 0); 560 561 rc = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL, 562 (u16 *)__LC_EXT_INT_CODE); 563 rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR); 564 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 565 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 566 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw, 567 sizeof(psw_t)); 568 return rc ? -EFAULT : 0; 569 } 570 571 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu) 572 { 573 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 574 struct kvm_s390_pgm_info pgm_info; 575 int rc = 0, nullifying = false; 576 u16 ilen; 577 578 spin_lock(&li->lock); 579 pgm_info = li->irq.pgm; 580 clear_bit(IRQ_PEND_PROG, &li->pending_irqs); 581 memset(&li->irq.pgm, 0, sizeof(pgm_info)); 582 spin_unlock(&li->lock); 583 584 ilen = pgm_info.flags & KVM_S390_PGM_FLAGS_ILC_MASK; 585 VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilen:%d", 586 pgm_info.code, ilen); 587 vcpu->stat.deliver_program_int++; 588 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT, 589 pgm_info.code, 0); 590 591 switch (pgm_info.code & ~PGM_PER) { 592 case PGM_AFX_TRANSLATION: 593 case PGM_ASX_TRANSLATION: 594 case PGM_EX_TRANSLATION: 595 case PGM_LFX_TRANSLATION: 596 case PGM_LSTE_SEQUENCE: 597 case PGM_LSX_TRANSLATION: 598 case PGM_LX_TRANSLATION: 599 case PGM_PRIMARY_AUTHORITY: 600 case PGM_SECONDARY_AUTHORITY: 601 nullifying = true; 602 /* fall through */ 603 case PGM_SPACE_SWITCH: 604 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code, 605 (u64 *)__LC_TRANS_EXC_CODE); 606 break; 607 case PGM_ALEN_TRANSLATION: 608 case PGM_ALE_SEQUENCE: 609 case PGM_ASTE_INSTANCE: 610 case PGM_ASTE_SEQUENCE: 611 case PGM_ASTE_VALIDITY: 612 case PGM_EXTENDED_AUTHORITY: 613 rc = put_guest_lc(vcpu, pgm_info.exc_access_id, 614 (u8 *)__LC_EXC_ACCESS_ID); 615 nullifying = true; 616 break; 617 case PGM_ASCE_TYPE: 618 case PGM_PAGE_TRANSLATION: 619 case PGM_REGION_FIRST_TRANS: 620 case PGM_REGION_SECOND_TRANS: 621 case PGM_REGION_THIRD_TRANS: 622 case PGM_SEGMENT_TRANSLATION: 623 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code, 624 (u64 *)__LC_TRANS_EXC_CODE); 625 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id, 626 (u8 *)__LC_EXC_ACCESS_ID); 627 rc |= put_guest_lc(vcpu, pgm_info.op_access_id, 628 (u8 *)__LC_OP_ACCESS_ID); 629 nullifying = true; 630 break; 631 case PGM_MONITOR: 632 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr, 633 (u16 *)__LC_MON_CLASS_NR); 634 rc |= put_guest_lc(vcpu, pgm_info.mon_code, 635 (u64 *)__LC_MON_CODE); 636 break; 637 case PGM_VECTOR_PROCESSING: 638 case PGM_DATA: 639 rc = put_guest_lc(vcpu, pgm_info.data_exc_code, 640 (u32 *)__LC_DATA_EXC_CODE); 641 break; 642 case PGM_PROTECTION: 643 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code, 644 (u64 *)__LC_TRANS_EXC_CODE); 645 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id, 646 (u8 *)__LC_EXC_ACCESS_ID); 647 break; 648 case PGM_STACK_FULL: 649 case PGM_STACK_EMPTY: 650 case PGM_STACK_SPECIFICATION: 651 case PGM_STACK_TYPE: 652 case PGM_STACK_OPERATION: 653 case PGM_TRACE_TABEL: 654 case PGM_CRYPTO_OPERATION: 655 nullifying = true; 656 break; 657 } 658 659 if (pgm_info.code & PGM_PER) { 660 rc |= put_guest_lc(vcpu, pgm_info.per_code, 661 (u8 *) __LC_PER_CODE); 662 rc |= put_guest_lc(vcpu, pgm_info.per_atmid, 663 (u8 *)__LC_PER_ATMID); 664 rc |= put_guest_lc(vcpu, pgm_info.per_address, 665 (u64 *) __LC_PER_ADDRESS); 666 rc |= put_guest_lc(vcpu, pgm_info.per_access_id, 667 (u8 *) __LC_PER_ACCESS_ID); 668 } 669 670 if (nullifying && !(pgm_info.flags & KVM_S390_PGM_FLAGS_NO_REWIND)) 671 kvm_s390_rewind_psw(vcpu, ilen); 672 673 /* bit 1+2 of the target are the ilc, so we can directly use ilen */ 674 rc |= put_guest_lc(vcpu, ilen, (u16 *) __LC_PGM_ILC); 675 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea, 676 (u64 *) __LC_LAST_BREAK); 677 rc |= put_guest_lc(vcpu, pgm_info.code, 678 (u16 *)__LC_PGM_INT_CODE); 679 rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW, 680 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 681 rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW, 682 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 683 return rc ? -EFAULT : 0; 684 } 685 686 static int __must_check __deliver_service(struct kvm_vcpu *vcpu) 687 { 688 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 689 struct kvm_s390_ext_info ext; 690 int rc = 0; 691 692 spin_lock(&fi->lock); 693 if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) { 694 spin_unlock(&fi->lock); 695 return 0; 696 } 697 ext = fi->srv_signal; 698 memset(&fi->srv_signal, 0, sizeof(ext)); 699 clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs); 700 spin_unlock(&fi->lock); 701 702 VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x", 703 ext.ext_params); 704 vcpu->stat.deliver_service_signal++; 705 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE, 706 ext.ext_params, 0); 707 708 rc = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE); 709 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR); 710 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 711 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 712 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 713 &vcpu->arch.sie_block->gpsw, sizeof(psw_t)); 714 rc |= put_guest_lc(vcpu, ext.ext_params, 715 (u32 *)__LC_EXT_PARAMS); 716 717 return rc ? -EFAULT : 0; 718 } 719 720 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu) 721 { 722 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 723 struct kvm_s390_interrupt_info *inti; 724 int rc = 0; 725 726 spin_lock(&fi->lock); 727 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT], 728 struct kvm_s390_interrupt_info, 729 list); 730 if (inti) { 731 list_del(&inti->list); 732 fi->counters[FIRQ_CNTR_PFAULT] -= 1; 733 } 734 if (list_empty(&fi->lists[FIRQ_LIST_PFAULT])) 735 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs); 736 spin_unlock(&fi->lock); 737 738 if (inti) { 739 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, 740 KVM_S390_INT_PFAULT_DONE, 0, 741 inti->ext.ext_params2); 742 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx", 743 inti->ext.ext_params2); 744 745 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, 746 (u16 *)__LC_EXT_INT_CODE); 747 rc |= put_guest_lc(vcpu, PFAULT_DONE, 748 (u16 *)__LC_EXT_CPU_ADDR); 749 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 750 &vcpu->arch.sie_block->gpsw, 751 sizeof(psw_t)); 752 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 753 &vcpu->arch.sie_block->gpsw, 754 sizeof(psw_t)); 755 rc |= put_guest_lc(vcpu, inti->ext.ext_params2, 756 (u64 *)__LC_EXT_PARAMS2); 757 kfree(inti); 758 } 759 return rc ? -EFAULT : 0; 760 } 761 762 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu) 763 { 764 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; 765 struct kvm_s390_interrupt_info *inti; 766 int rc = 0; 767 768 spin_lock(&fi->lock); 769 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO], 770 struct kvm_s390_interrupt_info, 771 list); 772 if (inti) { 773 VCPU_EVENT(vcpu, 4, 774 "deliver: virtio parm: 0x%x,parm64: 0x%llx", 775 inti->ext.ext_params, inti->ext.ext_params2); 776 vcpu->stat.deliver_virtio_interrupt++; 777 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, 778 inti->type, 779 inti->ext.ext_params, 780 inti->ext.ext_params2); 781 list_del(&inti->list); 782 fi->counters[FIRQ_CNTR_VIRTIO] -= 1; 783 } 784 if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO])) 785 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs); 786 spin_unlock(&fi->lock); 787 788 if (inti) { 789 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, 790 (u16 *)__LC_EXT_INT_CODE); 791 rc |= put_guest_lc(vcpu, VIRTIO_PARAM, 792 (u16 *)__LC_EXT_CPU_ADDR); 793 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW, 794 &vcpu->arch.sie_block->gpsw, 795 sizeof(psw_t)); 796 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, 797 &vcpu->arch.sie_block->gpsw, 798 sizeof(psw_t)); 799 rc |= put_guest_lc(vcpu, inti->ext.ext_params, 800 (u32 *)__LC_EXT_PARAMS); 801 rc |= put_guest_lc(vcpu, inti->ext.ext_params2, 802 (u64 *)__LC_EXT_PARAMS2); 803 kfree(inti); 804 } 805 return rc ? -EFAULT : 0; 806 } 807 808 static int __must_check __deliver_io(struct kvm_vcpu *vcpu, 809 unsigned long irq_type) 810 { 811 struct list_head *isc_list; 812 struct kvm_s390_float_interrupt *fi; 813 struct kvm_s390_interrupt_info *inti = NULL; 814 int rc = 0; 815 816 fi = &vcpu->kvm->arch.float_int; 817 818 spin_lock(&fi->lock); 819 isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0]; 820 inti = list_first_entry_or_null(isc_list, 821 struct kvm_s390_interrupt_info, 822 list); 823 if (inti) { 824 VCPU_EVENT(vcpu, 4, "deliver: I/O 0x%llx", inti->type); 825 vcpu->stat.deliver_io_int++; 826 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, 827 inti->type, 828 ((__u32)inti->io.subchannel_id << 16) | 829 inti->io.subchannel_nr, 830 ((__u64)inti->io.io_int_parm << 32) | 831 inti->io.io_int_word); 832 list_del(&inti->list); 833 fi->counters[FIRQ_CNTR_IO] -= 1; 834 } 835 if (list_empty(isc_list)) 836 clear_bit(irq_type, &fi->pending_irqs); 837 spin_unlock(&fi->lock); 838 839 if (inti) { 840 rc = put_guest_lc(vcpu, inti->io.subchannel_id, 841 (u16 *)__LC_SUBCHANNEL_ID); 842 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr, 843 (u16 *)__LC_SUBCHANNEL_NR); 844 rc |= put_guest_lc(vcpu, inti->io.io_int_parm, 845 (u32 *)__LC_IO_INT_PARM); 846 rc |= put_guest_lc(vcpu, inti->io.io_int_word, 847 (u32 *)__LC_IO_INT_WORD); 848 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW, 849 &vcpu->arch.sie_block->gpsw, 850 sizeof(psw_t)); 851 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW, 852 &vcpu->arch.sie_block->gpsw, 853 sizeof(psw_t)); 854 kfree(inti); 855 } 856 857 return rc ? -EFAULT : 0; 858 } 859 860 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu); 861 862 static const deliver_irq_t deliver_irq_funcs[] = { 863 [IRQ_PEND_MCHK_EX] = __deliver_machine_check, 864 [IRQ_PEND_MCHK_REP] = __deliver_machine_check, 865 [IRQ_PEND_PROG] = __deliver_prog, 866 [IRQ_PEND_EXT_EMERGENCY] = __deliver_emergency_signal, 867 [IRQ_PEND_EXT_EXTERNAL] = __deliver_external_call, 868 [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc, 869 [IRQ_PEND_EXT_CPU_TIMER] = __deliver_cpu_timer, 870 [IRQ_PEND_RESTART] = __deliver_restart, 871 [IRQ_PEND_SET_PREFIX] = __deliver_set_prefix, 872 [IRQ_PEND_PFAULT_INIT] = __deliver_pfault_init, 873 [IRQ_PEND_EXT_SERVICE] = __deliver_service, 874 [IRQ_PEND_PFAULT_DONE] = __deliver_pfault_done, 875 [IRQ_PEND_VIRTIO] = __deliver_virtio, 876 }; 877 878 /* Check whether an external call is pending (deliverable or not) */ 879 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu) 880 { 881 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 882 883 if (!sclp.has_sigpif) 884 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs); 885 886 return sca_ext_call_pending(vcpu, NULL); 887 } 888 889 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop) 890 { 891 if (deliverable_irqs(vcpu)) 892 return 1; 893 894 if (kvm_cpu_has_pending_timer(vcpu)) 895 return 1; 896 897 /* external call pending and deliverable */ 898 if (kvm_s390_ext_call_pending(vcpu) && 899 !psw_extint_disabled(vcpu) && 900 (vcpu->arch.sie_block->gcr[0] & 0x2000ul)) 901 return 1; 902 903 if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu)) 904 return 1; 905 return 0; 906 } 907 908 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) 909 { 910 return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu); 911 } 912 913 static u64 __calculate_sltime(struct kvm_vcpu *vcpu) 914 { 915 u64 now, cputm, sltime = 0; 916 917 if (ckc_interrupts_enabled(vcpu)) { 918 now = kvm_s390_get_tod_clock_fast(vcpu->kvm); 919 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now); 920 /* already expired or overflow? */ 921 if (!sltime || vcpu->arch.sie_block->ckc <= now) 922 return 0; 923 if (cpu_timer_interrupts_enabled(vcpu)) { 924 cputm = kvm_s390_get_cpu_timer(vcpu); 925 /* already expired? */ 926 if (cputm >> 63) 927 return 0; 928 return min(sltime, tod_to_ns(cputm)); 929 } 930 } else if (cpu_timer_interrupts_enabled(vcpu)) { 931 sltime = kvm_s390_get_cpu_timer(vcpu); 932 /* already expired? */ 933 if (sltime >> 63) 934 return 0; 935 } 936 return sltime; 937 } 938 939 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu) 940 { 941 u64 sltime; 942 943 vcpu->stat.exit_wait_state++; 944 945 /* fast path */ 946 if (kvm_arch_vcpu_runnable(vcpu)) 947 return 0; 948 949 if (psw_interrupts_disabled(vcpu)) { 950 VCPU_EVENT(vcpu, 3, "%s", "disabled wait"); 951 return -EOPNOTSUPP; /* disabled wait */ 952 } 953 954 if (!ckc_interrupts_enabled(vcpu) && 955 !cpu_timer_interrupts_enabled(vcpu)) { 956 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer"); 957 __set_cpu_idle(vcpu); 958 goto no_timer; 959 } 960 961 sltime = __calculate_sltime(vcpu); 962 if (!sltime) 963 return 0; 964 965 __set_cpu_idle(vcpu); 966 hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL); 967 VCPU_EVENT(vcpu, 4, "enabled wait: %llu ns", sltime); 968 no_timer: 969 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 970 kvm_vcpu_block(vcpu); 971 __unset_cpu_idle(vcpu); 972 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 973 974 hrtimer_cancel(&vcpu->arch.ckc_timer); 975 return 0; 976 } 977 978 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu) 979 { 980 if (swait_active(&vcpu->wq)) { 981 /* 982 * The vcpu gave up the cpu voluntarily, mark it as a good 983 * yield-candidate. 984 */ 985 vcpu->preempted = true; 986 swake_up(&vcpu->wq); 987 vcpu->stat.halt_wakeup++; 988 } 989 } 990 991 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer) 992 { 993 struct kvm_vcpu *vcpu; 994 u64 sltime; 995 996 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer); 997 sltime = __calculate_sltime(vcpu); 998 999 /* 1000 * If the monotonic clock runs faster than the tod clock we might be 1001 * woken up too early and have to go back to sleep to avoid deadlocks. 1002 */ 1003 if (sltime && hrtimer_forward_now(timer, ns_to_ktime(sltime))) 1004 return HRTIMER_RESTART; 1005 kvm_s390_vcpu_wakeup(vcpu); 1006 return HRTIMER_NORESTART; 1007 } 1008 1009 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu) 1010 { 1011 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1012 1013 spin_lock(&li->lock); 1014 li->pending_irqs = 0; 1015 bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS); 1016 memset(&li->irq, 0, sizeof(li->irq)); 1017 spin_unlock(&li->lock); 1018 1019 sca_clear_ext_call(vcpu); 1020 } 1021 1022 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu) 1023 { 1024 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1025 deliver_irq_t func; 1026 int rc = 0; 1027 unsigned long irq_type; 1028 unsigned long irqs; 1029 1030 __reset_intercept_indicators(vcpu); 1031 1032 /* pending ckc conditions might have been invalidated */ 1033 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs); 1034 if (ckc_irq_pending(vcpu)) 1035 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs); 1036 1037 /* pending cpu timer conditions might have been invalidated */ 1038 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs); 1039 if (cpu_timer_irq_pending(vcpu)) 1040 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs); 1041 1042 while ((irqs = deliverable_irqs(vcpu)) && !rc) { 1043 /* bits are in the order of interrupt priority */ 1044 irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT); 1045 if (is_ioirq(irq_type)) { 1046 rc = __deliver_io(vcpu, irq_type); 1047 } else { 1048 func = deliver_irq_funcs[irq_type]; 1049 if (!func) { 1050 WARN_ON_ONCE(func == NULL); 1051 clear_bit(irq_type, &li->pending_irqs); 1052 continue; 1053 } 1054 rc = func(vcpu); 1055 } 1056 } 1057 1058 set_intercept_indicators(vcpu); 1059 1060 return rc; 1061 } 1062 1063 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 1064 { 1065 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1066 1067 VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code); 1068 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT, 1069 irq->u.pgm.code, 0); 1070 1071 if (!(irq->u.pgm.flags & KVM_S390_PGM_FLAGS_ILC_VALID)) { 1072 /* auto detection if no valid ILC was given */ 1073 irq->u.pgm.flags &= ~KVM_S390_PGM_FLAGS_ILC_MASK; 1074 irq->u.pgm.flags |= kvm_s390_get_ilen(vcpu); 1075 irq->u.pgm.flags |= KVM_S390_PGM_FLAGS_ILC_VALID; 1076 } 1077 1078 if (irq->u.pgm.code == PGM_PER) { 1079 li->irq.pgm.code |= PGM_PER; 1080 li->irq.pgm.flags = irq->u.pgm.flags; 1081 /* only modify PER related information */ 1082 li->irq.pgm.per_address = irq->u.pgm.per_address; 1083 li->irq.pgm.per_code = irq->u.pgm.per_code; 1084 li->irq.pgm.per_atmid = irq->u.pgm.per_atmid; 1085 li->irq.pgm.per_access_id = irq->u.pgm.per_access_id; 1086 } else if (!(irq->u.pgm.code & PGM_PER)) { 1087 li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) | 1088 irq->u.pgm.code; 1089 li->irq.pgm.flags = irq->u.pgm.flags; 1090 /* only modify non-PER information */ 1091 li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code; 1092 li->irq.pgm.mon_code = irq->u.pgm.mon_code; 1093 li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code; 1094 li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr; 1095 li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id; 1096 li->irq.pgm.op_access_id = irq->u.pgm.op_access_id; 1097 } else { 1098 li->irq.pgm = irq->u.pgm; 1099 } 1100 set_bit(IRQ_PEND_PROG, &li->pending_irqs); 1101 return 0; 1102 } 1103 1104 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 1105 { 1106 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1107 1108 VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx", 1109 irq->u.ext.ext_params2); 1110 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT, 1111 irq->u.ext.ext_params, 1112 irq->u.ext.ext_params2); 1113 1114 li->irq.ext = irq->u.ext; 1115 set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs); 1116 atomic_or(CPUSTAT_EXT_INT, li->cpuflags); 1117 return 0; 1118 } 1119 1120 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 1121 { 1122 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1123 struct kvm_s390_extcall_info *extcall = &li->irq.extcall; 1124 uint16_t src_id = irq->u.extcall.code; 1125 1126 VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u", 1127 src_id); 1128 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL, 1129 src_id, 0); 1130 1131 /* sending vcpu invalid */ 1132 if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL) 1133 return -EINVAL; 1134 1135 if (sclp.has_sigpif) 1136 return sca_inject_ext_call(vcpu, src_id); 1137 1138 if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs)) 1139 return -EBUSY; 1140 *extcall = irq->u.extcall; 1141 atomic_or(CPUSTAT_EXT_INT, li->cpuflags); 1142 return 0; 1143 } 1144 1145 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 1146 { 1147 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1148 struct kvm_s390_prefix_info *prefix = &li->irq.prefix; 1149 1150 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x", 1151 irq->u.prefix.address); 1152 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX, 1153 irq->u.prefix.address, 0); 1154 1155 if (!is_vcpu_stopped(vcpu)) 1156 return -EBUSY; 1157 1158 *prefix = irq->u.prefix; 1159 set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs); 1160 return 0; 1161 } 1162 1163 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS) 1164 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 1165 { 1166 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1167 struct kvm_s390_stop_info *stop = &li->irq.stop; 1168 int rc = 0; 1169 1170 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0); 1171 1172 if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS) 1173 return -EINVAL; 1174 1175 if (is_vcpu_stopped(vcpu)) { 1176 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS) 1177 rc = kvm_s390_store_status_unloaded(vcpu, 1178 KVM_S390_STORE_STATUS_NOADDR); 1179 return rc; 1180 } 1181 1182 if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs)) 1183 return -EBUSY; 1184 stop->flags = irq->u.stop.flags; 1185 __set_cpuflag(vcpu, CPUSTAT_STOP_INT); 1186 return 0; 1187 } 1188 1189 static int __inject_sigp_restart(struct kvm_vcpu *vcpu, 1190 struct kvm_s390_irq *irq) 1191 { 1192 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1193 1194 VCPU_EVENT(vcpu, 3, "%s", "inject: restart int"); 1195 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0); 1196 1197 set_bit(IRQ_PEND_RESTART, &li->pending_irqs); 1198 return 0; 1199 } 1200 1201 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu, 1202 struct kvm_s390_irq *irq) 1203 { 1204 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1205 1206 VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u", 1207 irq->u.emerg.code); 1208 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY, 1209 irq->u.emerg.code, 0); 1210 1211 /* sending vcpu invalid */ 1212 if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL) 1213 return -EINVAL; 1214 1215 set_bit(irq->u.emerg.code, li->sigp_emerg_pending); 1216 set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs); 1217 atomic_or(CPUSTAT_EXT_INT, li->cpuflags); 1218 return 0; 1219 } 1220 1221 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 1222 { 1223 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1224 struct kvm_s390_mchk_info *mchk = &li->irq.mchk; 1225 1226 VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx", 1227 irq->u.mchk.mcic); 1228 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0, 1229 irq->u.mchk.mcic); 1230 1231 /* 1232 * Because repressible machine checks can be indicated along with 1233 * exigent machine checks (PoP, Chapter 11, Interruption action) 1234 * we need to combine cr14, mcic and external damage code. 1235 * Failing storage address and the logout area should not be or'ed 1236 * together, we just indicate the last occurrence of the corresponding 1237 * machine check 1238 */ 1239 mchk->cr14 |= irq->u.mchk.cr14; 1240 mchk->mcic |= irq->u.mchk.mcic; 1241 mchk->ext_damage_code |= irq->u.mchk.ext_damage_code; 1242 mchk->failing_storage_address = irq->u.mchk.failing_storage_address; 1243 memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout, 1244 sizeof(mchk->fixed_logout)); 1245 if (mchk->mcic & MCHK_EX_MASK) 1246 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs); 1247 else if (mchk->mcic & MCHK_REP_MASK) 1248 set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs); 1249 return 0; 1250 } 1251 1252 static int __inject_ckc(struct kvm_vcpu *vcpu) 1253 { 1254 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1255 1256 VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external"); 1257 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP, 1258 0, 0); 1259 1260 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs); 1261 atomic_or(CPUSTAT_EXT_INT, li->cpuflags); 1262 return 0; 1263 } 1264 1265 static int __inject_cpu_timer(struct kvm_vcpu *vcpu) 1266 { 1267 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1268 1269 VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external"); 1270 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER, 1271 0, 0); 1272 1273 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs); 1274 atomic_or(CPUSTAT_EXT_INT, li->cpuflags); 1275 return 0; 1276 } 1277 1278 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm, 1279 int isc, u32 schid) 1280 { 1281 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; 1282 struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc]; 1283 struct kvm_s390_interrupt_info *iter; 1284 u16 id = (schid & 0xffff0000U) >> 16; 1285 u16 nr = schid & 0x0000ffffU; 1286 1287 spin_lock(&fi->lock); 1288 list_for_each_entry(iter, isc_list, list) { 1289 if (schid && (id != iter->io.subchannel_id || 1290 nr != iter->io.subchannel_nr)) 1291 continue; 1292 /* found an appropriate entry */ 1293 list_del_init(&iter->list); 1294 fi->counters[FIRQ_CNTR_IO] -= 1; 1295 if (list_empty(isc_list)) 1296 clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs); 1297 spin_unlock(&fi->lock); 1298 return iter; 1299 } 1300 spin_unlock(&fi->lock); 1301 return NULL; 1302 } 1303 1304 /* 1305 * Dequeue and return an I/O interrupt matching any of the interruption 1306 * subclasses as designated by the isc mask in cr6 and the schid (if != 0). 1307 */ 1308 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm, 1309 u64 isc_mask, u32 schid) 1310 { 1311 struct kvm_s390_interrupt_info *inti = NULL; 1312 int isc; 1313 1314 for (isc = 0; isc <= MAX_ISC && !inti; isc++) { 1315 if (isc_mask & isc_to_isc_bits(isc)) 1316 inti = get_io_int(kvm, isc, schid); 1317 } 1318 return inti; 1319 } 1320 1321 #define SCCB_MASK 0xFFFFFFF8 1322 #define SCCB_EVENT_PENDING 0x3 1323 1324 static int __inject_service(struct kvm *kvm, 1325 struct kvm_s390_interrupt_info *inti) 1326 { 1327 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; 1328 1329 spin_lock(&fi->lock); 1330 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING; 1331 /* 1332 * Early versions of the QEMU s390 bios will inject several 1333 * service interrupts after another without handling a 1334 * condition code indicating busy. 1335 * We will silently ignore those superfluous sccb values. 1336 * A future version of QEMU will take care of serialization 1337 * of servc requests 1338 */ 1339 if (fi->srv_signal.ext_params & SCCB_MASK) 1340 goto out; 1341 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK; 1342 set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs); 1343 out: 1344 spin_unlock(&fi->lock); 1345 kfree(inti); 1346 return 0; 1347 } 1348 1349 static int __inject_virtio(struct kvm *kvm, 1350 struct kvm_s390_interrupt_info *inti) 1351 { 1352 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; 1353 1354 spin_lock(&fi->lock); 1355 if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) { 1356 spin_unlock(&fi->lock); 1357 return -EBUSY; 1358 } 1359 fi->counters[FIRQ_CNTR_VIRTIO] += 1; 1360 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]); 1361 set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs); 1362 spin_unlock(&fi->lock); 1363 return 0; 1364 } 1365 1366 static int __inject_pfault_done(struct kvm *kvm, 1367 struct kvm_s390_interrupt_info *inti) 1368 { 1369 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; 1370 1371 spin_lock(&fi->lock); 1372 if (fi->counters[FIRQ_CNTR_PFAULT] >= 1373 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) { 1374 spin_unlock(&fi->lock); 1375 return -EBUSY; 1376 } 1377 fi->counters[FIRQ_CNTR_PFAULT] += 1; 1378 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]); 1379 set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs); 1380 spin_unlock(&fi->lock); 1381 return 0; 1382 } 1383 1384 #define CR_PENDING_SUBCLASS 28 1385 static int __inject_float_mchk(struct kvm *kvm, 1386 struct kvm_s390_interrupt_info *inti) 1387 { 1388 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; 1389 1390 spin_lock(&fi->lock); 1391 fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS); 1392 fi->mchk.mcic |= inti->mchk.mcic; 1393 set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs); 1394 spin_unlock(&fi->lock); 1395 kfree(inti); 1396 return 0; 1397 } 1398 1399 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti) 1400 { 1401 struct kvm_s390_float_interrupt *fi; 1402 struct list_head *list; 1403 int isc; 1404 1405 fi = &kvm->arch.float_int; 1406 spin_lock(&fi->lock); 1407 if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) { 1408 spin_unlock(&fi->lock); 1409 return -EBUSY; 1410 } 1411 fi->counters[FIRQ_CNTR_IO] += 1; 1412 1413 isc = int_word_to_isc(inti->io.io_int_word); 1414 list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc]; 1415 list_add_tail(&inti->list, list); 1416 set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs); 1417 spin_unlock(&fi->lock); 1418 return 0; 1419 } 1420 1421 /* 1422 * Find a destination VCPU for a floating irq and kick it. 1423 */ 1424 static void __floating_irq_kick(struct kvm *kvm, u64 type) 1425 { 1426 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; 1427 struct kvm_s390_local_interrupt *li; 1428 struct kvm_vcpu *dst_vcpu; 1429 int sigcpu, online_vcpus, nr_tries = 0; 1430 1431 online_vcpus = atomic_read(&kvm->online_vcpus); 1432 if (!online_vcpus) 1433 return; 1434 1435 /* find idle VCPUs first, then round robin */ 1436 sigcpu = find_first_bit(fi->idle_mask, online_vcpus); 1437 if (sigcpu == online_vcpus) { 1438 do { 1439 sigcpu = fi->next_rr_cpu; 1440 fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus; 1441 /* avoid endless loops if all vcpus are stopped */ 1442 if (nr_tries++ >= online_vcpus) 1443 return; 1444 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu))); 1445 } 1446 dst_vcpu = kvm_get_vcpu(kvm, sigcpu); 1447 1448 /* make the VCPU drop out of the SIE, or wake it up if sleeping */ 1449 li = &dst_vcpu->arch.local_int; 1450 spin_lock(&li->lock); 1451 switch (type) { 1452 case KVM_S390_MCHK: 1453 atomic_or(CPUSTAT_STOP_INT, li->cpuflags); 1454 break; 1455 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 1456 atomic_or(CPUSTAT_IO_INT, li->cpuflags); 1457 break; 1458 default: 1459 atomic_or(CPUSTAT_EXT_INT, li->cpuflags); 1460 break; 1461 } 1462 spin_unlock(&li->lock); 1463 kvm_s390_vcpu_wakeup(dst_vcpu); 1464 } 1465 1466 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti) 1467 { 1468 u64 type = READ_ONCE(inti->type); 1469 int rc; 1470 1471 switch (type) { 1472 case KVM_S390_MCHK: 1473 rc = __inject_float_mchk(kvm, inti); 1474 break; 1475 case KVM_S390_INT_VIRTIO: 1476 rc = __inject_virtio(kvm, inti); 1477 break; 1478 case KVM_S390_INT_SERVICE: 1479 rc = __inject_service(kvm, inti); 1480 break; 1481 case KVM_S390_INT_PFAULT_DONE: 1482 rc = __inject_pfault_done(kvm, inti); 1483 break; 1484 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 1485 rc = __inject_io(kvm, inti); 1486 break; 1487 default: 1488 rc = -EINVAL; 1489 } 1490 if (rc) 1491 return rc; 1492 1493 __floating_irq_kick(kvm, type); 1494 return 0; 1495 } 1496 1497 int kvm_s390_inject_vm(struct kvm *kvm, 1498 struct kvm_s390_interrupt *s390int) 1499 { 1500 struct kvm_s390_interrupt_info *inti; 1501 int rc; 1502 1503 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 1504 if (!inti) 1505 return -ENOMEM; 1506 1507 inti->type = s390int->type; 1508 switch (inti->type) { 1509 case KVM_S390_INT_VIRTIO: 1510 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx", 1511 s390int->parm, s390int->parm64); 1512 inti->ext.ext_params = s390int->parm; 1513 inti->ext.ext_params2 = s390int->parm64; 1514 break; 1515 case KVM_S390_INT_SERVICE: 1516 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm); 1517 inti->ext.ext_params = s390int->parm; 1518 break; 1519 case KVM_S390_INT_PFAULT_DONE: 1520 inti->ext.ext_params2 = s390int->parm64; 1521 break; 1522 case KVM_S390_MCHK: 1523 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx", 1524 s390int->parm64); 1525 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */ 1526 inti->mchk.mcic = s390int->parm64; 1527 break; 1528 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 1529 if (inti->type & KVM_S390_INT_IO_AI_MASK) 1530 VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)"); 1531 else 1532 VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x", 1533 s390int->type & IOINT_CSSID_MASK, 1534 s390int->type & IOINT_SSID_MASK, 1535 s390int->type & IOINT_SCHID_MASK); 1536 inti->io.subchannel_id = s390int->parm >> 16; 1537 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu; 1538 inti->io.io_int_parm = s390int->parm64 >> 32; 1539 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull; 1540 break; 1541 default: 1542 kfree(inti); 1543 return -EINVAL; 1544 } 1545 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64, 1546 2); 1547 1548 rc = __inject_vm(kvm, inti); 1549 if (rc) 1550 kfree(inti); 1551 return rc; 1552 } 1553 1554 int kvm_s390_reinject_io_int(struct kvm *kvm, 1555 struct kvm_s390_interrupt_info *inti) 1556 { 1557 return __inject_vm(kvm, inti); 1558 } 1559 1560 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int, 1561 struct kvm_s390_irq *irq) 1562 { 1563 irq->type = s390int->type; 1564 switch (irq->type) { 1565 case KVM_S390_PROGRAM_INT: 1566 if (s390int->parm & 0xffff0000) 1567 return -EINVAL; 1568 irq->u.pgm.code = s390int->parm; 1569 break; 1570 case KVM_S390_SIGP_SET_PREFIX: 1571 irq->u.prefix.address = s390int->parm; 1572 break; 1573 case KVM_S390_SIGP_STOP: 1574 irq->u.stop.flags = s390int->parm; 1575 break; 1576 case KVM_S390_INT_EXTERNAL_CALL: 1577 if (s390int->parm & 0xffff0000) 1578 return -EINVAL; 1579 irq->u.extcall.code = s390int->parm; 1580 break; 1581 case KVM_S390_INT_EMERGENCY: 1582 if (s390int->parm & 0xffff0000) 1583 return -EINVAL; 1584 irq->u.emerg.code = s390int->parm; 1585 break; 1586 case KVM_S390_MCHK: 1587 irq->u.mchk.mcic = s390int->parm64; 1588 break; 1589 } 1590 return 0; 1591 } 1592 1593 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu) 1594 { 1595 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1596 1597 return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs); 1598 } 1599 1600 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu) 1601 { 1602 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1603 1604 spin_lock(&li->lock); 1605 li->irq.stop.flags = 0; 1606 clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs); 1607 spin_unlock(&li->lock); 1608 } 1609 1610 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 1611 { 1612 int rc; 1613 1614 switch (irq->type) { 1615 case KVM_S390_PROGRAM_INT: 1616 rc = __inject_prog(vcpu, irq); 1617 break; 1618 case KVM_S390_SIGP_SET_PREFIX: 1619 rc = __inject_set_prefix(vcpu, irq); 1620 break; 1621 case KVM_S390_SIGP_STOP: 1622 rc = __inject_sigp_stop(vcpu, irq); 1623 break; 1624 case KVM_S390_RESTART: 1625 rc = __inject_sigp_restart(vcpu, irq); 1626 break; 1627 case KVM_S390_INT_CLOCK_COMP: 1628 rc = __inject_ckc(vcpu); 1629 break; 1630 case KVM_S390_INT_CPU_TIMER: 1631 rc = __inject_cpu_timer(vcpu); 1632 break; 1633 case KVM_S390_INT_EXTERNAL_CALL: 1634 rc = __inject_extcall(vcpu, irq); 1635 break; 1636 case KVM_S390_INT_EMERGENCY: 1637 rc = __inject_sigp_emergency(vcpu, irq); 1638 break; 1639 case KVM_S390_MCHK: 1640 rc = __inject_mchk(vcpu, irq); 1641 break; 1642 case KVM_S390_INT_PFAULT_INIT: 1643 rc = __inject_pfault_init(vcpu, irq); 1644 break; 1645 case KVM_S390_INT_VIRTIO: 1646 case KVM_S390_INT_SERVICE: 1647 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 1648 default: 1649 rc = -EINVAL; 1650 } 1651 1652 return rc; 1653 } 1654 1655 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) 1656 { 1657 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 1658 int rc; 1659 1660 spin_lock(&li->lock); 1661 rc = do_inject_vcpu(vcpu, irq); 1662 spin_unlock(&li->lock); 1663 if (!rc) 1664 kvm_s390_vcpu_wakeup(vcpu); 1665 return rc; 1666 } 1667 1668 static inline void clear_irq_list(struct list_head *_list) 1669 { 1670 struct kvm_s390_interrupt_info *inti, *n; 1671 1672 list_for_each_entry_safe(inti, n, _list, list) { 1673 list_del(&inti->list); 1674 kfree(inti); 1675 } 1676 } 1677 1678 static void inti_to_irq(struct kvm_s390_interrupt_info *inti, 1679 struct kvm_s390_irq *irq) 1680 { 1681 irq->type = inti->type; 1682 switch (inti->type) { 1683 case KVM_S390_INT_PFAULT_INIT: 1684 case KVM_S390_INT_PFAULT_DONE: 1685 case KVM_S390_INT_VIRTIO: 1686 irq->u.ext = inti->ext; 1687 break; 1688 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 1689 irq->u.io = inti->io; 1690 break; 1691 } 1692 } 1693 1694 void kvm_s390_clear_float_irqs(struct kvm *kvm) 1695 { 1696 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; 1697 int i; 1698 1699 spin_lock(&fi->lock); 1700 fi->pending_irqs = 0; 1701 memset(&fi->srv_signal, 0, sizeof(fi->srv_signal)); 1702 memset(&fi->mchk, 0, sizeof(fi->mchk)); 1703 for (i = 0; i < FIRQ_LIST_COUNT; i++) 1704 clear_irq_list(&fi->lists[i]); 1705 for (i = 0; i < FIRQ_MAX_COUNT; i++) 1706 fi->counters[i] = 0; 1707 spin_unlock(&fi->lock); 1708 }; 1709 1710 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len) 1711 { 1712 struct kvm_s390_interrupt_info *inti; 1713 struct kvm_s390_float_interrupt *fi; 1714 struct kvm_s390_irq *buf; 1715 struct kvm_s390_irq *irq; 1716 int max_irqs; 1717 int ret = 0; 1718 int n = 0; 1719 int i; 1720 1721 if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0) 1722 return -EINVAL; 1723 1724 /* 1725 * We are already using -ENOMEM to signal 1726 * userspace it may retry with a bigger buffer, 1727 * so we need to use something else for this case 1728 */ 1729 buf = vzalloc(len); 1730 if (!buf) 1731 return -ENOBUFS; 1732 1733 max_irqs = len / sizeof(struct kvm_s390_irq); 1734 1735 fi = &kvm->arch.float_int; 1736 spin_lock(&fi->lock); 1737 for (i = 0; i < FIRQ_LIST_COUNT; i++) { 1738 list_for_each_entry(inti, &fi->lists[i], list) { 1739 if (n == max_irqs) { 1740 /* signal userspace to try again */ 1741 ret = -ENOMEM; 1742 goto out; 1743 } 1744 inti_to_irq(inti, &buf[n]); 1745 n++; 1746 } 1747 } 1748 if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) { 1749 if (n == max_irqs) { 1750 /* signal userspace to try again */ 1751 ret = -ENOMEM; 1752 goto out; 1753 } 1754 irq = (struct kvm_s390_irq *) &buf[n]; 1755 irq->type = KVM_S390_INT_SERVICE; 1756 irq->u.ext = fi->srv_signal; 1757 n++; 1758 } 1759 if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) { 1760 if (n == max_irqs) { 1761 /* signal userspace to try again */ 1762 ret = -ENOMEM; 1763 goto out; 1764 } 1765 irq = (struct kvm_s390_irq *) &buf[n]; 1766 irq->type = KVM_S390_MCHK; 1767 irq->u.mchk = fi->mchk; 1768 n++; 1769 } 1770 1771 out: 1772 spin_unlock(&fi->lock); 1773 if (!ret && n > 0) { 1774 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n)) 1775 ret = -EFAULT; 1776 } 1777 vfree(buf); 1778 1779 return ret < 0 ? ret : n; 1780 } 1781 1782 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr) 1783 { 1784 int r; 1785 1786 switch (attr->group) { 1787 case KVM_DEV_FLIC_GET_ALL_IRQS: 1788 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr, 1789 attr->attr); 1790 break; 1791 default: 1792 r = -EINVAL; 1793 } 1794 1795 return r; 1796 } 1797 1798 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti, 1799 u64 addr) 1800 { 1801 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr; 1802 void *target = NULL; 1803 void __user *source; 1804 u64 size; 1805 1806 if (get_user(inti->type, (u64 __user *)addr)) 1807 return -EFAULT; 1808 1809 switch (inti->type) { 1810 case KVM_S390_INT_PFAULT_INIT: 1811 case KVM_S390_INT_PFAULT_DONE: 1812 case KVM_S390_INT_VIRTIO: 1813 case KVM_S390_INT_SERVICE: 1814 target = (void *) &inti->ext; 1815 source = &uptr->u.ext; 1816 size = sizeof(inti->ext); 1817 break; 1818 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: 1819 target = (void *) &inti->io; 1820 source = &uptr->u.io; 1821 size = sizeof(inti->io); 1822 break; 1823 case KVM_S390_MCHK: 1824 target = (void *) &inti->mchk; 1825 source = &uptr->u.mchk; 1826 size = sizeof(inti->mchk); 1827 break; 1828 default: 1829 return -EINVAL; 1830 } 1831 1832 if (copy_from_user(target, source, size)) 1833 return -EFAULT; 1834 1835 return 0; 1836 } 1837 1838 static int enqueue_floating_irq(struct kvm_device *dev, 1839 struct kvm_device_attr *attr) 1840 { 1841 struct kvm_s390_interrupt_info *inti = NULL; 1842 int r = 0; 1843 int len = attr->attr; 1844 1845 if (len % sizeof(struct kvm_s390_irq) != 0) 1846 return -EINVAL; 1847 else if (len > KVM_S390_FLIC_MAX_BUFFER) 1848 return -EINVAL; 1849 1850 while (len >= sizeof(struct kvm_s390_irq)) { 1851 inti = kzalloc(sizeof(*inti), GFP_KERNEL); 1852 if (!inti) 1853 return -ENOMEM; 1854 1855 r = copy_irq_from_user(inti, attr->addr); 1856 if (r) { 1857 kfree(inti); 1858 return r; 1859 } 1860 r = __inject_vm(dev->kvm, inti); 1861 if (r) { 1862 kfree(inti); 1863 return r; 1864 } 1865 len -= sizeof(struct kvm_s390_irq); 1866 attr->addr += sizeof(struct kvm_s390_irq); 1867 } 1868 1869 return r; 1870 } 1871 1872 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id) 1873 { 1874 if (id >= MAX_S390_IO_ADAPTERS) 1875 return NULL; 1876 return kvm->arch.adapters[id]; 1877 } 1878 1879 static int register_io_adapter(struct kvm_device *dev, 1880 struct kvm_device_attr *attr) 1881 { 1882 struct s390_io_adapter *adapter; 1883 struct kvm_s390_io_adapter adapter_info; 1884 1885 if (copy_from_user(&adapter_info, 1886 (void __user *)attr->addr, sizeof(adapter_info))) 1887 return -EFAULT; 1888 1889 if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) || 1890 (dev->kvm->arch.adapters[adapter_info.id] != NULL)) 1891 return -EINVAL; 1892 1893 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL); 1894 if (!adapter) 1895 return -ENOMEM; 1896 1897 INIT_LIST_HEAD(&adapter->maps); 1898 init_rwsem(&adapter->maps_lock); 1899 atomic_set(&adapter->nr_maps, 0); 1900 adapter->id = adapter_info.id; 1901 adapter->isc = adapter_info.isc; 1902 adapter->maskable = adapter_info.maskable; 1903 adapter->masked = false; 1904 adapter->swap = adapter_info.swap; 1905 dev->kvm->arch.adapters[adapter->id] = adapter; 1906 1907 return 0; 1908 } 1909 1910 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked) 1911 { 1912 int ret; 1913 struct s390_io_adapter *adapter = get_io_adapter(kvm, id); 1914 1915 if (!adapter || !adapter->maskable) 1916 return -EINVAL; 1917 ret = adapter->masked; 1918 adapter->masked = masked; 1919 return ret; 1920 } 1921 1922 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr) 1923 { 1924 struct s390_io_adapter *adapter = get_io_adapter(kvm, id); 1925 struct s390_map_info *map; 1926 int ret; 1927 1928 if (!adapter || !addr) 1929 return -EINVAL; 1930 1931 map = kzalloc(sizeof(*map), GFP_KERNEL); 1932 if (!map) { 1933 ret = -ENOMEM; 1934 goto out; 1935 } 1936 INIT_LIST_HEAD(&map->list); 1937 map->guest_addr = addr; 1938 map->addr = gmap_translate(kvm->arch.gmap, addr); 1939 if (map->addr == -EFAULT) { 1940 ret = -EFAULT; 1941 goto out; 1942 } 1943 ret = get_user_pages_fast(map->addr, 1, 1, &map->page); 1944 if (ret < 0) 1945 goto out; 1946 BUG_ON(ret != 1); 1947 down_write(&adapter->maps_lock); 1948 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) { 1949 list_add_tail(&map->list, &adapter->maps); 1950 ret = 0; 1951 } else { 1952 put_page(map->page); 1953 ret = -EINVAL; 1954 } 1955 up_write(&adapter->maps_lock); 1956 out: 1957 if (ret) 1958 kfree(map); 1959 return ret; 1960 } 1961 1962 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr) 1963 { 1964 struct s390_io_adapter *adapter = get_io_adapter(kvm, id); 1965 struct s390_map_info *map, *tmp; 1966 int found = 0; 1967 1968 if (!adapter || !addr) 1969 return -EINVAL; 1970 1971 down_write(&adapter->maps_lock); 1972 list_for_each_entry_safe(map, tmp, &adapter->maps, list) { 1973 if (map->guest_addr == addr) { 1974 found = 1; 1975 atomic_dec(&adapter->nr_maps); 1976 list_del(&map->list); 1977 put_page(map->page); 1978 kfree(map); 1979 break; 1980 } 1981 } 1982 up_write(&adapter->maps_lock); 1983 1984 return found ? 0 : -EINVAL; 1985 } 1986 1987 void kvm_s390_destroy_adapters(struct kvm *kvm) 1988 { 1989 int i; 1990 struct s390_map_info *map, *tmp; 1991 1992 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) { 1993 if (!kvm->arch.adapters[i]) 1994 continue; 1995 list_for_each_entry_safe(map, tmp, 1996 &kvm->arch.adapters[i]->maps, list) { 1997 list_del(&map->list); 1998 put_page(map->page); 1999 kfree(map); 2000 } 2001 kfree(kvm->arch.adapters[i]); 2002 } 2003 } 2004 2005 static int modify_io_adapter(struct kvm_device *dev, 2006 struct kvm_device_attr *attr) 2007 { 2008 struct kvm_s390_io_adapter_req req; 2009 struct s390_io_adapter *adapter; 2010 int ret; 2011 2012 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req))) 2013 return -EFAULT; 2014 2015 adapter = get_io_adapter(dev->kvm, req.id); 2016 if (!adapter) 2017 return -EINVAL; 2018 switch (req.type) { 2019 case KVM_S390_IO_ADAPTER_MASK: 2020 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask); 2021 if (ret > 0) 2022 ret = 0; 2023 break; 2024 case KVM_S390_IO_ADAPTER_MAP: 2025 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr); 2026 break; 2027 case KVM_S390_IO_ADAPTER_UNMAP: 2028 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr); 2029 break; 2030 default: 2031 ret = -EINVAL; 2032 } 2033 2034 return ret; 2035 } 2036 2037 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr) 2038 { 2039 int r = 0; 2040 unsigned int i; 2041 struct kvm_vcpu *vcpu; 2042 2043 switch (attr->group) { 2044 case KVM_DEV_FLIC_ENQUEUE: 2045 r = enqueue_floating_irq(dev, attr); 2046 break; 2047 case KVM_DEV_FLIC_CLEAR_IRQS: 2048 kvm_s390_clear_float_irqs(dev->kvm); 2049 break; 2050 case KVM_DEV_FLIC_APF_ENABLE: 2051 dev->kvm->arch.gmap->pfault_enabled = 1; 2052 break; 2053 case KVM_DEV_FLIC_APF_DISABLE_WAIT: 2054 dev->kvm->arch.gmap->pfault_enabled = 0; 2055 /* 2056 * Make sure no async faults are in transition when 2057 * clearing the queues. So we don't need to worry 2058 * about late coming workers. 2059 */ 2060 synchronize_srcu(&dev->kvm->srcu); 2061 kvm_for_each_vcpu(i, vcpu, dev->kvm) 2062 kvm_clear_async_pf_completion_queue(vcpu); 2063 break; 2064 case KVM_DEV_FLIC_ADAPTER_REGISTER: 2065 r = register_io_adapter(dev, attr); 2066 break; 2067 case KVM_DEV_FLIC_ADAPTER_MODIFY: 2068 r = modify_io_adapter(dev, attr); 2069 break; 2070 default: 2071 r = -EINVAL; 2072 } 2073 2074 return r; 2075 } 2076 2077 static int flic_create(struct kvm_device *dev, u32 type) 2078 { 2079 if (!dev) 2080 return -EINVAL; 2081 if (dev->kvm->arch.flic) 2082 return -EINVAL; 2083 dev->kvm->arch.flic = dev; 2084 return 0; 2085 } 2086 2087 static void flic_destroy(struct kvm_device *dev) 2088 { 2089 dev->kvm->arch.flic = NULL; 2090 kfree(dev); 2091 } 2092 2093 /* s390 floating irq controller (flic) */ 2094 struct kvm_device_ops kvm_flic_ops = { 2095 .name = "kvm-flic", 2096 .get_attr = flic_get_attr, 2097 .set_attr = flic_set_attr, 2098 .create = flic_create, 2099 .destroy = flic_destroy, 2100 }; 2101 2102 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap) 2103 { 2104 unsigned long bit; 2105 2106 bit = bit_nr + (addr % PAGE_SIZE) * 8; 2107 2108 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit; 2109 } 2110 2111 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter, 2112 u64 addr) 2113 { 2114 struct s390_map_info *map; 2115 2116 if (!adapter) 2117 return NULL; 2118 2119 list_for_each_entry(map, &adapter->maps, list) { 2120 if (map->guest_addr == addr) 2121 return map; 2122 } 2123 return NULL; 2124 } 2125 2126 static int adapter_indicators_set(struct kvm *kvm, 2127 struct s390_io_adapter *adapter, 2128 struct kvm_s390_adapter_int *adapter_int) 2129 { 2130 unsigned long bit; 2131 int summary_set, idx; 2132 struct s390_map_info *info; 2133 void *map; 2134 2135 info = get_map_info(adapter, adapter_int->ind_addr); 2136 if (!info) 2137 return -1; 2138 map = page_address(info->page); 2139 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap); 2140 set_bit(bit, map); 2141 idx = srcu_read_lock(&kvm->srcu); 2142 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT); 2143 set_page_dirty_lock(info->page); 2144 info = get_map_info(adapter, adapter_int->summary_addr); 2145 if (!info) { 2146 srcu_read_unlock(&kvm->srcu, idx); 2147 return -1; 2148 } 2149 map = page_address(info->page); 2150 bit = get_ind_bit(info->addr, adapter_int->summary_offset, 2151 adapter->swap); 2152 summary_set = test_and_set_bit(bit, map); 2153 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT); 2154 set_page_dirty_lock(info->page); 2155 srcu_read_unlock(&kvm->srcu, idx); 2156 return summary_set ? 0 : 1; 2157 } 2158 2159 /* 2160 * < 0 - not injected due to error 2161 * = 0 - coalesced, summary indicator already active 2162 * > 0 - injected interrupt 2163 */ 2164 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e, 2165 struct kvm *kvm, int irq_source_id, int level, 2166 bool line_status) 2167 { 2168 int ret; 2169 struct s390_io_adapter *adapter; 2170 2171 /* We're only interested in the 0->1 transition. */ 2172 if (!level) 2173 return 0; 2174 adapter = get_io_adapter(kvm, e->adapter.adapter_id); 2175 if (!adapter) 2176 return -1; 2177 down_read(&adapter->maps_lock); 2178 ret = adapter_indicators_set(kvm, adapter, &e->adapter); 2179 up_read(&adapter->maps_lock); 2180 if ((ret > 0) && !adapter->masked) { 2181 struct kvm_s390_interrupt s390int = { 2182 .type = KVM_S390_INT_IO(1, 0, 0, 0), 2183 .parm = 0, 2184 .parm64 = (adapter->isc << 27) | 0x80000000, 2185 }; 2186 ret = kvm_s390_inject_vm(kvm, &s390int); 2187 if (ret == 0) 2188 ret = 1; 2189 } 2190 return ret; 2191 } 2192 2193 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e, 2194 const struct kvm_irq_routing_entry *ue) 2195 { 2196 int ret; 2197 2198 switch (ue->type) { 2199 case KVM_IRQ_ROUTING_S390_ADAPTER: 2200 e->set = set_adapter_int; 2201 e->adapter.summary_addr = ue->u.adapter.summary_addr; 2202 e->adapter.ind_addr = ue->u.adapter.ind_addr; 2203 e->adapter.summary_offset = ue->u.adapter.summary_offset; 2204 e->adapter.ind_offset = ue->u.adapter.ind_offset; 2205 e->adapter.adapter_id = ue->u.adapter.adapter_id; 2206 ret = 0; 2207 break; 2208 default: 2209 ret = -EINVAL; 2210 } 2211 2212 return ret; 2213 } 2214 2215 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm, 2216 int irq_source_id, int level, bool line_status) 2217 { 2218 return -EINVAL; 2219 } 2220 2221 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len) 2222 { 2223 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 2224 struct kvm_s390_irq *buf; 2225 int r = 0; 2226 int n; 2227 2228 buf = vmalloc(len); 2229 if (!buf) 2230 return -ENOMEM; 2231 2232 if (copy_from_user((void *) buf, irqstate, len)) { 2233 r = -EFAULT; 2234 goto out_free; 2235 } 2236 2237 /* 2238 * Don't allow setting the interrupt state 2239 * when there are already interrupts pending 2240 */ 2241 spin_lock(&li->lock); 2242 if (li->pending_irqs) { 2243 r = -EBUSY; 2244 goto out_unlock; 2245 } 2246 2247 for (n = 0; n < len / sizeof(*buf); n++) { 2248 r = do_inject_vcpu(vcpu, &buf[n]); 2249 if (r) 2250 break; 2251 } 2252 2253 out_unlock: 2254 spin_unlock(&li->lock); 2255 out_free: 2256 vfree(buf); 2257 2258 return r; 2259 } 2260 2261 static void store_local_irq(struct kvm_s390_local_interrupt *li, 2262 struct kvm_s390_irq *irq, 2263 unsigned long irq_type) 2264 { 2265 switch (irq_type) { 2266 case IRQ_PEND_MCHK_EX: 2267 case IRQ_PEND_MCHK_REP: 2268 irq->type = KVM_S390_MCHK; 2269 irq->u.mchk = li->irq.mchk; 2270 break; 2271 case IRQ_PEND_PROG: 2272 irq->type = KVM_S390_PROGRAM_INT; 2273 irq->u.pgm = li->irq.pgm; 2274 break; 2275 case IRQ_PEND_PFAULT_INIT: 2276 irq->type = KVM_S390_INT_PFAULT_INIT; 2277 irq->u.ext = li->irq.ext; 2278 break; 2279 case IRQ_PEND_EXT_EXTERNAL: 2280 irq->type = KVM_S390_INT_EXTERNAL_CALL; 2281 irq->u.extcall = li->irq.extcall; 2282 break; 2283 case IRQ_PEND_EXT_CLOCK_COMP: 2284 irq->type = KVM_S390_INT_CLOCK_COMP; 2285 break; 2286 case IRQ_PEND_EXT_CPU_TIMER: 2287 irq->type = KVM_S390_INT_CPU_TIMER; 2288 break; 2289 case IRQ_PEND_SIGP_STOP: 2290 irq->type = KVM_S390_SIGP_STOP; 2291 irq->u.stop = li->irq.stop; 2292 break; 2293 case IRQ_PEND_RESTART: 2294 irq->type = KVM_S390_RESTART; 2295 break; 2296 case IRQ_PEND_SET_PREFIX: 2297 irq->type = KVM_S390_SIGP_SET_PREFIX; 2298 irq->u.prefix = li->irq.prefix; 2299 break; 2300 } 2301 } 2302 2303 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len) 2304 { 2305 int scn; 2306 unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)]; 2307 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; 2308 unsigned long pending_irqs; 2309 struct kvm_s390_irq irq; 2310 unsigned long irq_type; 2311 int cpuaddr; 2312 int n = 0; 2313 2314 spin_lock(&li->lock); 2315 pending_irqs = li->pending_irqs; 2316 memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending, 2317 sizeof(sigp_emerg_pending)); 2318 spin_unlock(&li->lock); 2319 2320 for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) { 2321 memset(&irq, 0, sizeof(irq)); 2322 if (irq_type == IRQ_PEND_EXT_EMERGENCY) 2323 continue; 2324 if (n + sizeof(irq) > len) 2325 return -ENOBUFS; 2326 store_local_irq(&vcpu->arch.local_int, &irq, irq_type); 2327 if (copy_to_user(&buf[n], &irq, sizeof(irq))) 2328 return -EFAULT; 2329 n += sizeof(irq); 2330 } 2331 2332 if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) { 2333 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) { 2334 memset(&irq, 0, sizeof(irq)); 2335 if (n + sizeof(irq) > len) 2336 return -ENOBUFS; 2337 irq.type = KVM_S390_INT_EMERGENCY; 2338 irq.u.emerg.code = cpuaddr; 2339 if (copy_to_user(&buf[n], &irq, sizeof(irq))) 2340 return -EFAULT; 2341 n += sizeof(irq); 2342 } 2343 } 2344 2345 if (sca_ext_call_pending(vcpu, &scn)) { 2346 if (n + sizeof(irq) > len) 2347 return -ENOBUFS; 2348 memset(&irq, 0, sizeof(irq)); 2349 irq.type = KVM_S390_INT_EXTERNAL_CALL; 2350 irq.u.extcall.code = scn; 2351 if (copy_to_user(&buf[n], &irq, sizeof(irq))) 2352 return -EFAULT; 2353 n += sizeof(irq); 2354 } 2355 2356 return n; 2357 } 2358