arch/s390/kvm/interrupt.c

   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 PFAULT_INIT 0x0600
  32 #define PFAULT_DONE 0x0680
  33 #define VIRTIO_PARAM 0x0d00
  34
  35 /* handle external calls via sigp interpretation facility */
  36 static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id)
  37 {
  38         int c, scn;
  39
  40         if (!(atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND))
  41                 return 0;
  42
  43         read_lock(&vcpu->kvm->arch.sca_lock);
  44         if (vcpu->kvm->arch.use_esca) {
  45                 struct esca_block *sca = vcpu->kvm->arch.sca;
  46                 union esca_sigp_ctrl sigp_ctrl =
  47                         sca->cpu[vcpu->vcpu_id].sigp_ctrl;
  48
  49                 c = sigp_ctrl.c;
  50                 scn = sigp_ctrl.scn;
  51         } else {
  52                 struct bsca_block *sca = vcpu->kvm->arch.sca;
  53                 union bsca_sigp_ctrl sigp_ctrl =
  54                         sca->cpu[vcpu->vcpu_id].sigp_ctrl;
  55
  56                 c = sigp_ctrl.c;
  57                 scn = sigp_ctrl.scn;
  58         }
  59         read_unlock(&vcpu->kvm->arch.sca_lock);
  60
  61         if (src_id)
  62                 *src_id = scn;
  63
  64         return c;
  65 }
  66
  67 static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)
  68 {
  69         int expect, rc;
  70
  71         read_lock(&vcpu->kvm->arch.sca_lock);
  72         if (vcpu->kvm->arch.use_esca) {
  73                 struct esca_block *sca = vcpu->kvm->arch.sca;
  74                 union esca_sigp_ctrl *sigp_ctrl =
  75                         &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
  76                 union esca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
  77
  78                 new_val.scn = src_id;
  79                 new_val.c = 1;
  80                 old_val.c = 0;
  81
  82                 expect = old_val.value;
  83                 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
  84         } else {
  85                 struct bsca_block *sca = vcpu->kvm->arch.sca;
  86                 union bsca_sigp_ctrl *sigp_ctrl =
  87                         &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
  88                 union bsca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
  89
  90                 new_val.scn = src_id;
  91                 new_val.c = 1;
  92                 old_val.c = 0;
  93
  94                 expect = old_val.value;
  95                 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
  96         }
  97         read_unlock(&vcpu->kvm->arch.sca_lock);
  98
  99         if (rc != expect) {
 100                 /* another external call is pending */
 101                 return -EBUSY;
 102         }
 103         atomic_or(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
 104         return 0;
 105 }
 106
 107 static void sca_clear_ext_call(struct kvm_vcpu *vcpu)
 108 {
 109         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 110         int rc, expect;
 111
 112         atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags);
 113         read_lock(&vcpu->kvm->arch.sca_lock);
 114         if (vcpu->kvm->arch.use_esca) {
 115                 struct esca_block *sca = vcpu->kvm->arch.sca;
 116                 union esca_sigp_ctrl *sigp_ctrl =
 117                         &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
 118                 union esca_sigp_ctrl old = *sigp_ctrl;
 119
 120                 expect = old.value;
 121                 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
 122         } else {
 123                 struct bsca_block *sca = vcpu->kvm->arch.sca;
 124                 union bsca_sigp_ctrl *sigp_ctrl =
 125                         &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
 126                 union bsca_sigp_ctrl old = *sigp_ctrl;
 127
 128                 expect = old.value;
 129                 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
 130         }
 131         read_unlock(&vcpu->kvm->arch.sca_lock);
 132         WARN_ON(rc != expect); /* cannot clear? */
 133 }
 134
 135 int psw_extint_disabled(struct kvm_vcpu *vcpu)
 136 {
 137         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
 138 }
 139
 140 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
 141 {
 142         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
 143 }
 144
 145 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
 146 {
 147         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
 148 }
 149
 150 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
 151 {
 152         return psw_extint_disabled(vcpu) &&
 153                psw_ioint_disabled(vcpu) &&
 154                psw_mchk_disabled(vcpu);
 155 }
 156
 157 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
 158 {
 159         if (psw_extint_disabled(vcpu) ||
 160             !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
 161                 return 0;
 162         if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
 163                 /* No timer interrupts when single stepping */
 164                 return 0;
 165         return 1;
 166 }
 167
 168 static int ckc_irq_pending(struct kvm_vcpu *vcpu)
 169 {
 170         if (vcpu->arch.sie_block->ckc >= kvm_s390_get_tod_clock_fast(vcpu->kvm))
 171                 return 0;
 172         return ckc_interrupts_enabled(vcpu);
 173 }
 174
 175 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
 176 {
 177         return !psw_extint_disabled(vcpu) &&
 178                (vcpu->arch.sie_block->gcr[0] & 0x400ul);
 179 }
 180
 181 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
 182 {
 183         if (!cpu_timer_interrupts_enabled(vcpu))
 184                 return 0;
 185         return kvm_s390_get_cpu_timer(vcpu) >> 63;
 186 }
 187
 188 static inline int is_ioirq(unsigned long irq_type)
 189 {
 190         return ((irq_type >= IRQ_PEND_IO_ISC_0) &&
 191                 (irq_type <= IRQ_PEND_IO_ISC_7));
 192 }
 193
 194 static uint64_t isc_to_isc_bits(int isc)
 195 {
 196         return (0x80 >> isc) << 24;
 197 }
 198
 199 static inline u8 int_word_to_isc(u32 int_word)
 200 {
 201         return (int_word & 0x38000000) >> 27;
 202 }
 203
 204 static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
 205 {
 206         return vcpu->kvm->arch.float_int.pending_irqs |
 207                vcpu->arch.local_int.pending_irqs;
 208 }
 209
 210 static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
 211                                    unsigned long active_mask)
 212 {
 213         int i;
 214
 215         for (i = 0; i <= MAX_ISC; i++)
 216                 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
 217                         active_mask &= ~(1UL << (IRQ_PEND_IO_ISC_0 + i));
 218
 219         return active_mask;
 220 }
 221
 222 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
 223 {
 224         unsigned long active_mask;
 225
 226         active_mask = pending_irqs(vcpu);
 227         if (!active_mask)
 228                 return 0;
 229
 230         if (psw_extint_disabled(vcpu))
 231                 active_mask &= ~IRQ_PEND_EXT_MASK;
 232         if (psw_ioint_disabled(vcpu))
 233                 active_mask &= ~IRQ_PEND_IO_MASK;
 234         else
 235                 active_mask = disable_iscs(vcpu, active_mask);
 236         if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
 237                 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
 238         if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
 239                 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
 240         if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
 241                 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
 242         if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
 243                 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
 244         if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
 245                 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
 246         if (psw_mchk_disabled(vcpu))
 247                 active_mask &= ~IRQ_PEND_MCHK_MASK;
 248         if (!(vcpu->arch.sie_block->gcr[14] &
 249               vcpu->kvm->arch.float_int.mchk.cr14))
 250                 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
 251
 252         /*
 253          * STOP irqs will never be actively delivered. They are triggered via
 254          * intercept requests and cleared when the stop intercept is performed.
 255          */
 256         __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
 257
 258         return active_mask;
 259 }
 260
 261 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
 262 {
 263         atomic_or(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 264         set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 265 }
 266
 267 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
 268 {
 269         atomic_andnot(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 270         clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 271 }
 272
 273 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
 274 {
 275         atomic_andnot(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
 276                     &vcpu->arch.sie_block->cpuflags);
 277         vcpu->arch.sie_block->lctl = 0x0000;
 278         vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
 279
 280         if (guestdbg_enabled(vcpu)) {
 281                 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
 282                                                LCTL_CR10 | LCTL_CR11);
 283                 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
 284         }
 285 }
 286
 287 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
 288 {
 289         atomic_or(flag, &vcpu->arch.sie_block->cpuflags);
 290 }
 291
 292 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
 293 {
 294         if (!(pending_irqs(vcpu) & IRQ_PEND_IO_MASK))
 295                 return;
 296         else if (psw_ioint_disabled(vcpu))
 297                 __set_cpuflag(vcpu, CPUSTAT_IO_INT);
 298         else
 299                 vcpu->arch.sie_block->lctl |= LCTL_CR6;
 300 }
 301
 302 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
 303 {
 304         if (!(pending_irqs(vcpu) & IRQ_PEND_EXT_MASK))
 305                 return;
 306         if (psw_extint_disabled(vcpu))
 307                 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
 308         else
 309                 vcpu->arch.sie_block->lctl |= LCTL_CR0;
 310 }
 311
 312 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
 313 {
 314         if (!(pending_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
 315                 return;
 316         if (psw_mchk_disabled(vcpu))
 317                 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
 318         else
 319                 vcpu->arch.sie_block->lctl |= LCTL_CR14;
 320 }
 321
 322 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
 323 {
 324         if (kvm_s390_is_stop_irq_pending(vcpu))
 325                 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
 326 }
 327
 328 /* Set interception request for non-deliverable interrupts */
 329 static void set_intercept_indicators(struct kvm_vcpu *vcpu)
 330 {
 331         set_intercept_indicators_io(vcpu);
 332         set_intercept_indicators_ext(vcpu);
 333         set_intercept_indicators_mchk(vcpu);
 334         set_intercept_indicators_stop(vcpu);
 335 }
 336
 337 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
 338 {
 339         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 340         int rc;
 341
 342         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
 343                                          0, 0);
 344
 345         rc  = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
 346                            (u16 *)__LC_EXT_INT_CODE);
 347         rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 348         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 349                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 350         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 351                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 352         clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
 353         return rc ? -EFAULT : 0;
 354 }
 355
 356 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
 357 {
 358         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 359         int rc;
 360
 361         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
 362                                          0, 0);
 363
 364         rc  = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
 365                            (u16 __user *)__LC_EXT_INT_CODE);
 366         rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 367         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 368                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 369         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 370                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 371         clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
 372         return rc ? -EFAULT : 0;
 373 }
 374
 375 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
 376 {
 377         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 378         struct kvm_s390_ext_info ext;
 379         int rc;
 380
 381         spin_lock(&li->lock);
 382         ext = li->irq.ext;
 383         clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
 384         li->irq.ext.ext_params2 = 0;
 385         spin_unlock(&li->lock);
 386
 387         VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
 388                    ext.ext_params2);
 389         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 390                                          KVM_S390_INT_PFAULT_INIT,
 391                                          0, ext.ext_params2);
 392
 393         rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
 394         rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
 395         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 396                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 397         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 398                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 399         rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
 400         return rc ? -EFAULT : 0;
 401 }
 402
 403 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
 404 {
 405         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 406         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 407         struct kvm_s390_mchk_info mchk = {};
 408         unsigned long adtl_status_addr;
 409         int deliver = 0;
 410         int rc = 0;
 411
 412         spin_lock(&fi->lock);
 413         spin_lock(&li->lock);
 414         if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
 415             test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
 416                 /*
 417                  * If there was an exigent machine check pending, then any
 418                  * repressible machine checks that might have been pending
 419                  * are indicated along with it, so always clear bits for
 420                  * repressible and exigent interrupts
 421                  */
 422                 mchk = li->irq.mchk;
 423                 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
 424                 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
 425                 memset(&li->irq.mchk, 0, sizeof(mchk));
 426                 deliver = 1;
 427         }
 428         /*
 429          * We indicate floating repressible conditions along with
 430          * other pending conditions. Channel Report Pending and Channel
 431          * Subsystem damage are the only two and and are indicated by
 432          * bits in mcic and masked in cr14.
 433          */
 434         if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
 435                 mchk.mcic |= fi->mchk.mcic;
 436                 mchk.cr14 |= fi->mchk.cr14;
 437                 memset(&fi->mchk, 0, sizeof(mchk));
 438                 deliver = 1;
 439         }
 440         spin_unlock(&li->lock);
 441         spin_unlock(&fi->lock);
 442
 443         if (deliver) {
 444                 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
 445                            mchk.mcic);
 446                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 447                                                  KVM_S390_MCHK,
 448                                                  mchk.cr14, mchk.mcic);
 449
 450                 rc  = kvm_s390_vcpu_store_status(vcpu,
 451                                                  KVM_S390_STORE_STATUS_PREFIXED);
 452                 rc |= read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR,
 453                                     &adtl_status_addr,
 454                                     sizeof(unsigned long));
 455                 rc |= kvm_s390_vcpu_store_adtl_status(vcpu,
 456                                                       adtl_status_addr);
 457                 rc |= put_guest_lc(vcpu, mchk.mcic,
 458                                    (u64 __user *) __LC_MCCK_CODE);
 459                 rc |= put_guest_lc(vcpu, mchk.failing_storage_address,
 460                                    (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
 461                 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA,
 462                                      &mchk.fixed_logout,
 463                                      sizeof(mchk.fixed_logout));
 464                 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
 465                                      &vcpu->arch.sie_block->gpsw,
 466                                      sizeof(psw_t));
 467                 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
 468                                     &vcpu->arch.sie_block->gpsw,
 469                                     sizeof(psw_t));
 470         }
 471         return rc ? -EFAULT : 0;
 472 }
 473
 474 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
 475 {
 476         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 477         int rc;
 478
 479         VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
 480         vcpu->stat.deliver_restart_signal++;
 481         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
 482
 483         rc  = write_guest_lc(vcpu,
 484                              offsetof(struct lowcore, restart_old_psw),
 485                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 486         rc |= read_guest_lc(vcpu, offsetof(struct lowcore, restart_psw),
 487                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 488         clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
 489         return rc ? -EFAULT : 0;
 490 }
 491
 492 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
 493 {
 494         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 495         struct kvm_s390_prefix_info prefix;
 496
 497         spin_lock(&li->lock);
 498         prefix = li->irq.prefix;
 499         li->irq.prefix.address = 0;
 500         clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
 501         spin_unlock(&li->lock);
 502
 503         vcpu->stat.deliver_prefix_signal++;
 504         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 505                                          KVM_S390_SIGP_SET_PREFIX,
 506                                          prefix.address, 0);
 507
 508         kvm_s390_set_prefix(vcpu, prefix.address);
 509         return 0;
 510 }
 511
 512 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
 513 {
 514         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 515         int rc;
 516         int cpu_addr;
 517
 518         spin_lock(&li->lock);
 519         cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
 520         clear_bit(cpu_addr, li->sigp_emerg_pending);
 521         if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
 522                 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
 523         spin_unlock(&li->lock);
 524
 525         VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
 526         vcpu->stat.deliver_emergency_signal++;
 527         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
 528                                          cpu_addr, 0);
 529
 530         rc  = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
 531                            (u16 *)__LC_EXT_INT_CODE);
 532         rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
 533         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 534                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 535         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 536                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 537         return rc ? -EFAULT : 0;
 538 }
 539
 540 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
 541 {
 542         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 543         struct kvm_s390_extcall_info extcall;
 544         int rc;
 545
 546         spin_lock(&li->lock);
 547         extcall = li->irq.extcall;
 548         li->irq.extcall.code = 0;
 549         clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
 550         spin_unlock(&li->lock);
 551
 552         VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
 553         vcpu->stat.deliver_external_call++;
 554         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 555                                          KVM_S390_INT_EXTERNAL_CALL,
 556                                          extcall.code, 0);
 557
 558         rc  = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
 559                            (u16 *)__LC_EXT_INT_CODE);
 560         rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
 561         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 562                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 563         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
 564                             sizeof(psw_t));
 565         return rc ? -EFAULT : 0;
 566 }
 567
 568 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
 569 {
 570         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 571         struct kvm_s390_pgm_info pgm_info;
 572         int rc = 0, nullifying = false;
 573         u16 ilen;
 574
 575         spin_lock(&li->lock);
 576         pgm_info = li->irq.pgm;
 577         clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
 578         memset(&li->irq.pgm, 0, sizeof(pgm_info));
 579         spin_unlock(&li->lock);
 580
 581         ilen = pgm_info.flags & KVM_S390_PGM_FLAGS_ILC_MASK;
 582         VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilen:%d",
 583                    pgm_info.code, ilen);
 584         vcpu->stat.deliver_program_int++;
 585         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
 586                                          pgm_info.code, 0);
 587
 588         switch (pgm_info.code & ~PGM_PER) {
 589         case PGM_AFX_TRANSLATION:
 590         case PGM_ASX_TRANSLATION:
 591         case PGM_EX_TRANSLATION:
 592         case PGM_LFX_TRANSLATION:
 593         case PGM_LSTE_SEQUENCE:
 594         case PGM_LSX_TRANSLATION:
 595         case PGM_LX_TRANSLATION:
 596         case PGM_PRIMARY_AUTHORITY:
 597         case PGM_SECONDARY_AUTHORITY:
 598                 nullifying = true;
 599                 /* fall through */
 600         case PGM_SPACE_SWITCH:
 601                 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
 602                                   (u64 *)__LC_TRANS_EXC_CODE);
 603                 break;
 604         case PGM_ALEN_TRANSLATION:
 605         case PGM_ALE_SEQUENCE:
 606         case PGM_ASTE_INSTANCE:
 607         case PGM_ASTE_SEQUENCE:
 608         case PGM_ASTE_VALIDITY:
 609         case PGM_EXTENDED_AUTHORITY:
 610                 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
 611                                   (u8 *)__LC_EXC_ACCESS_ID);
 612                 nullifying = true;
 613                 break;
 614         case PGM_ASCE_TYPE:
 615         case PGM_PAGE_TRANSLATION:
 616         case PGM_REGION_FIRST_TRANS:
 617         case PGM_REGION_SECOND_TRANS:
 618         case PGM_REGION_THIRD_TRANS:
 619         case PGM_SEGMENT_TRANSLATION:
 620                 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
 621                                   (u64 *)__LC_TRANS_EXC_CODE);
 622                 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
 623                                    (u8 *)__LC_EXC_ACCESS_ID);
 624                 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
 625                                    (u8 *)__LC_OP_ACCESS_ID);
 626                 nullifying = true;
 627                 break;
 628         case PGM_MONITOR:
 629                 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
 630                                   (u16 *)__LC_MON_CLASS_NR);
 631                 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
 632                                    (u64 *)__LC_MON_CODE);
 633                 break;
 634         case PGM_VECTOR_PROCESSING:
 635         case PGM_DATA:
 636                 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
 637                                   (u32 *)__LC_DATA_EXC_CODE);
 638                 break;
 639         case PGM_PROTECTION:
 640                 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
 641                                   (u64 *)__LC_TRANS_EXC_CODE);
 642                 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
 643                                    (u8 *)__LC_EXC_ACCESS_ID);
 644                 break;
 645         case PGM_STACK_FULL:
 646         case PGM_STACK_EMPTY:
 647         case PGM_STACK_SPECIFICATION:
 648         case PGM_STACK_TYPE:
 649         case PGM_STACK_OPERATION:
 650         case PGM_TRACE_TABEL:
 651         case PGM_CRYPTO_OPERATION:
 652                 nullifying = true;
 653                 break;
 654         }
 655
 656         if (pgm_info.code & PGM_PER) {
 657                 rc |= put_guest_lc(vcpu, pgm_info.per_code,
 658                                    (u8 *) __LC_PER_CODE);
 659                 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
 660                                    (u8 *)__LC_PER_ATMID);
 661                 rc |= put_guest_lc(vcpu, pgm_info.per_address,
 662                                    (u64 *) __LC_PER_ADDRESS);
 663                 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
 664                                    (u8 *) __LC_PER_ACCESS_ID);
 665         }
 666
 667         if (nullifying && !(pgm_info.flags & KVM_S390_PGM_FLAGS_NO_REWIND))
 668                 kvm_s390_rewind_psw(vcpu, ilen);
 669
 670         /* bit 1+2 of the target are the ilc, so we can directly use ilen */
 671         rc |= put_guest_lc(vcpu, ilen, (u16 *) __LC_PGM_ILC);
 672         rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
 673                                  (u64 *) __LC_LAST_BREAK);
 674         rc |= put_guest_lc(vcpu, pgm_info.code,
 675                            (u16 *)__LC_PGM_INT_CODE);
 676         rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
 677                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 678         rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
 679                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 680         return rc ? -EFAULT : 0;
 681 }
 682
 683 static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
 684 {
 685         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 686         struct kvm_s390_ext_info ext;
 687         int rc = 0;
 688
 689         spin_lock(&fi->lock);
 690         if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
 691                 spin_unlock(&fi->lock);
 692                 return 0;
 693         }
 694         ext = fi->srv_signal;
 695         memset(&fi->srv_signal, 0, sizeof(ext));
 696         clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
 697         spin_unlock(&fi->lock);
 698
 699         VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
 700                    ext.ext_params);
 701         vcpu->stat.deliver_service_signal++;
 702         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
 703                                          ext.ext_params, 0);
 704
 705         rc  = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
 706         rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 707         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 708                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 709         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 710                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 711         rc |= put_guest_lc(vcpu, ext.ext_params,
 712                            (u32 *)__LC_EXT_PARAMS);
 713
 714         return rc ? -EFAULT : 0;
 715 }
 716
 717 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
 718 {
 719         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 720         struct kvm_s390_interrupt_info *inti;
 721         int rc = 0;
 722
 723         spin_lock(&fi->lock);
 724         inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
 725                                         struct kvm_s390_interrupt_info,
 726                                         list);
 727         if (inti) {
 728                 list_del(&inti->list);
 729                 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
 730         }
 731         if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
 732                 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
 733         spin_unlock(&fi->lock);
 734
 735         if (inti) {
 736                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 737                                                  KVM_S390_INT_PFAULT_DONE, 0,
 738                                                  inti->ext.ext_params2);
 739                 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
 740                            inti->ext.ext_params2);
 741
 742                 rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
 743                                 (u16 *)__LC_EXT_INT_CODE);
 744                 rc |= put_guest_lc(vcpu, PFAULT_DONE,
 745                                 (u16 *)__LC_EXT_CPU_ADDR);
 746                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 747                                 &vcpu->arch.sie_block->gpsw,
 748                                 sizeof(psw_t));
 749                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 750                                 &vcpu->arch.sie_block->gpsw,
 751                                 sizeof(psw_t));
 752                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 753                                 (u64 *)__LC_EXT_PARAMS2);
 754                 kfree(inti);
 755         }
 756         return rc ? -EFAULT : 0;
 757 }
 758
 759 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
 760 {
 761         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 762         struct kvm_s390_interrupt_info *inti;
 763         int rc = 0;
 764
 765         spin_lock(&fi->lock);
 766         inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
 767                                         struct kvm_s390_interrupt_info,
 768                                         list);
 769         if (inti) {
 770                 VCPU_EVENT(vcpu, 4,
 771                            "deliver: virtio parm: 0x%x,parm64: 0x%llx",
 772                            inti->ext.ext_params, inti->ext.ext_params2);
 773                 vcpu->stat.deliver_virtio_interrupt++;
 774                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 775                                 inti->type,
 776                                 inti->ext.ext_params,
 777                                 inti->ext.ext_params2);
 778                 list_del(&inti->list);
 779                 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
 780         }
 781         if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
 782                 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
 783         spin_unlock(&fi->lock);
 784
 785         if (inti) {
 786                 rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
 787                                 (u16 *)__LC_EXT_INT_CODE);
 788                 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
 789                                 (u16 *)__LC_EXT_CPU_ADDR);
 790                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 791                                 &vcpu->arch.sie_block->gpsw,
 792                                 sizeof(psw_t));
 793                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 794                                 &vcpu->arch.sie_block->gpsw,
 795                                 sizeof(psw_t));
 796                 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
 797                                 (u32 *)__LC_EXT_PARAMS);
 798                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 799                                 (u64 *)__LC_EXT_PARAMS2);
 800                 kfree(inti);
 801         }
 802         return rc ? -EFAULT : 0;
 803 }
 804
 805 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
 806                                      unsigned long irq_type)
 807 {
 808         struct list_head *isc_list;
 809         struct kvm_s390_float_interrupt *fi;
 810         struct kvm_s390_interrupt_info *inti = NULL;
 811         int rc = 0;
 812
 813         fi = &vcpu->kvm->arch.float_int;
 814
 815         spin_lock(&fi->lock);
 816         isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0];
 817         inti = list_first_entry_or_null(isc_list,
 818                                         struct kvm_s390_interrupt_info,
 819                                         list);
 820         if (inti) {
 821                 if (inti->type & KVM_S390_INT_IO_AI_MASK)
 822                         VCPU_EVENT(vcpu, 4, "%s", "deliver: I/O (AI)");
 823                 else
 824                         VCPU_EVENT(vcpu, 4, "deliver: I/O %x ss %x schid %04x",
 825                         inti->io.subchannel_id >> 8,
 826                         inti->io.subchannel_id >> 1 & 0x3,
 827                         inti->io.subchannel_nr);
 828
 829                 vcpu->stat.deliver_io_int++;
 830                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 831                                 inti->type,
 832                                 ((__u32)inti->io.subchannel_id << 16) |
 833                                 inti->io.subchannel_nr,
 834                                 ((__u64)inti->io.io_int_parm << 32) |
 835                                 inti->io.io_int_word);
 836                 list_del(&inti->list);
 837                 fi->counters[FIRQ_CNTR_IO] -= 1;
 838         }
 839         if (list_empty(isc_list))
 840                 clear_bit(irq_type, &fi->pending_irqs);
 841         spin_unlock(&fi->lock);
 842
 843         if (inti) {
 844                 rc  = put_guest_lc(vcpu, inti->io.subchannel_id,
 845                                 (u16 *)__LC_SUBCHANNEL_ID);
 846                 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
 847                                 (u16 *)__LC_SUBCHANNEL_NR);
 848                 rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
 849                                 (u32 *)__LC_IO_INT_PARM);
 850                 rc |= put_guest_lc(vcpu, inti->io.io_int_word,
 851                                 (u32 *)__LC_IO_INT_WORD);
 852                 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
 853                                 &vcpu->arch.sie_block->gpsw,
 854                                 sizeof(psw_t));
 855                 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
 856                                 &vcpu->arch.sie_block->gpsw,
 857                                 sizeof(psw_t));
 858                 kfree(inti);
 859         }
 860
 861         return rc ? -EFAULT : 0;
 862 }
 863
 864 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);
 865
 866 static const deliver_irq_t deliver_irq_funcs[] = {
 867         [IRQ_PEND_MCHK_EX]        = __deliver_machine_check,
 868         [IRQ_PEND_MCHK_REP]       = __deliver_machine_check,
 869         [IRQ_PEND_PROG]           = __deliver_prog,
 870         [IRQ_PEND_EXT_EMERGENCY]  = __deliver_emergency_signal,
 871         [IRQ_PEND_EXT_EXTERNAL]   = __deliver_external_call,
 872         [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc,
 873         [IRQ_PEND_EXT_CPU_TIMER]  = __deliver_cpu_timer,
 874         [IRQ_PEND_RESTART]        = __deliver_restart,
 875         [IRQ_PEND_SET_PREFIX]     = __deliver_set_prefix,
 876         [IRQ_PEND_PFAULT_INIT]    = __deliver_pfault_init,
 877         [IRQ_PEND_EXT_SERVICE]    = __deliver_service,
 878         [IRQ_PEND_PFAULT_DONE]    = __deliver_pfault_done,
 879         [IRQ_PEND_VIRTIO]         = __deliver_virtio,
 880 };
 881
 882 /* Check whether an external call is pending (deliverable or not) */
 883 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
 884 {
 885         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 886
 887         if (!sclp.has_sigpif)
 888                 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
 889
 890         return sca_ext_call_pending(vcpu, NULL);
 891 }
 892
 893 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
 894 {
 895         if (deliverable_irqs(vcpu))
 896                 return 1;
 897
 898         if (kvm_cpu_has_pending_timer(vcpu))
 899                 return 1;
 900
 901         /* external call pending and deliverable */
 902         if (kvm_s390_ext_call_pending(vcpu) &&
 903             !psw_extint_disabled(vcpu) &&
 904             (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
 905                 return 1;
 906
 907         if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
 908                 return 1;
 909         return 0;
 910 }
 911
 912 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 913 {
 914         return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
 915 }
 916
 917 static u64 __calculate_sltime(struct kvm_vcpu *vcpu)
 918 {
 919         u64 now, cputm, sltime = 0;
 920
 921         if (ckc_interrupts_enabled(vcpu)) {
 922                 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
 923                 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
 924                 /* already expired or overflow? */
 925                 if (!sltime || vcpu->arch.sie_block->ckc <= now)
 926                         return 0;
 927                 if (cpu_timer_interrupts_enabled(vcpu)) {
 928                         cputm = kvm_s390_get_cpu_timer(vcpu);
 929                         /* already expired? */
 930                         if (cputm >> 63)
 931                                 return 0;
 932                         return min(sltime, tod_to_ns(cputm));
 933                 }
 934         } else if (cpu_timer_interrupts_enabled(vcpu)) {
 935                 sltime = kvm_s390_get_cpu_timer(vcpu);
 936                 /* already expired? */
 937                 if (sltime >> 63)
 938                         return 0;
 939         }
 940         return sltime;
 941 }
 942
 943 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
 944 {
 945         u64 sltime;
 946
 947         vcpu->stat.exit_wait_state++;
 948
 949         /* fast path */
 950         if (kvm_arch_vcpu_runnable(vcpu))
 951                 return 0;
 952
 953         if (psw_interrupts_disabled(vcpu)) {
 954                 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
 955                 return -EOPNOTSUPP; /* disabled wait */
 956         }
 957
 958         if (!ckc_interrupts_enabled(vcpu) &&
 959             !cpu_timer_interrupts_enabled(vcpu)) {
 960                 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
 961                 __set_cpu_idle(vcpu);
 962                 goto no_timer;
 963         }
 964
 965         sltime = __calculate_sltime(vcpu);
 966         if (!sltime)
 967                 return 0;
 968
 969         __set_cpu_idle(vcpu);
 970         hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
 971         VCPU_EVENT(vcpu, 4, "enabled wait: %llu ns", sltime);
 972 no_timer:
 973         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
 974         kvm_vcpu_block(vcpu);
 975         __unset_cpu_idle(vcpu);
 976         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
 977
 978         hrtimer_cancel(&vcpu->arch.ckc_timer);
 979         return 0;
 980 }
 981
 982 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
 983 {
 984         /*
 985          * We cannot move this into the if, as the CPU might be already
 986          * in kvm_vcpu_block without having the waitqueue set (polling)
 987          */
 988         vcpu->valid_wakeup = true;
 989         if (swait_active(&vcpu->wq)) {
 990                 /*
 991                  * The vcpu gave up the cpu voluntarily, mark it as a good
 992                  * yield-candidate.
 993                  */
 994                 vcpu->preempted = true;
 995                 swake_up(&vcpu->wq);
 996                 vcpu->stat.halt_wakeup++;
 997         }
 998         /*
 999          * The VCPU might not be sleeping but is executing the VSIE. Let's
1000          * kick it, so it leaves the SIE to process the request.
1001          */
1002         kvm_s390_vsie_kick(vcpu);
1003 }
1004
1005 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
1006 {
1007         struct kvm_vcpu *vcpu;
1008         u64 sltime;
1009
1010         vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
1011         sltime = __calculate_sltime(vcpu);
1012
1013         /*
1014          * If the monotonic clock runs faster than the tod clock we might be
1015          * woken up too early and have to go back to sleep to avoid deadlocks.
1016          */
1017         if (sltime && hrtimer_forward_now(timer, ns_to_ktime(sltime)))
1018                 return HRTIMER_RESTART;
1019         kvm_s390_vcpu_wakeup(vcpu);
1020         return HRTIMER_NORESTART;
1021 }
1022
1023 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
1024 {
1025         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1026
1027         spin_lock(&li->lock);
1028         li->pending_irqs = 0;
1029         bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
1030         memset(&li->irq, 0, sizeof(li->irq));
1031         spin_unlock(&li->lock);
1032
1033         sca_clear_ext_call(vcpu);
1034 }
1035
1036 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
1037 {
1038         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1039         deliver_irq_t func;
1040         int rc = 0;
1041         unsigned long irq_type;
1042         unsigned long irqs;
1043
1044         __reset_intercept_indicators(vcpu);
1045
1046         /* pending ckc conditions might have been invalidated */
1047         clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1048         if (ckc_irq_pending(vcpu))
1049                 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1050
1051         /* pending cpu timer conditions might have been invalidated */
1052         clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1053         if (cpu_timer_irq_pending(vcpu))
1054                 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1055
1056         while ((irqs = deliverable_irqs(vcpu)) && !rc) {
1057                 /* bits are in the order of interrupt priority */
1058                 irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT);
1059                 if (is_ioirq(irq_type)) {
1060                         rc = __deliver_io(vcpu, irq_type);
1061                 } else {
1062                         func = deliver_irq_funcs[irq_type];
1063                         if (!func) {
1064                                 WARN_ON_ONCE(func == NULL);
1065                                 clear_bit(irq_type, &li->pending_irqs);
1066                                 continue;
1067                         }
1068                         rc = func(vcpu);
1069                 }
1070         }
1071
1072         set_intercept_indicators(vcpu);
1073
1074         return rc;
1075 }
1076
1077 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1078 {
1079         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1080
1081         VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
1082         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
1083                                    irq->u.pgm.code, 0);
1084
1085         if (!(irq->u.pgm.flags & KVM_S390_PGM_FLAGS_ILC_VALID)) {
1086                 /* auto detection if no valid ILC was given */
1087                 irq->u.pgm.flags &= ~KVM_S390_PGM_FLAGS_ILC_MASK;
1088                 irq->u.pgm.flags |= kvm_s390_get_ilen(vcpu);
1089                 irq->u.pgm.flags |= KVM_S390_PGM_FLAGS_ILC_VALID;
1090         }
1091
1092         if (irq->u.pgm.code == PGM_PER) {
1093                 li->irq.pgm.code |= PGM_PER;
1094                 li->irq.pgm.flags = irq->u.pgm.flags;
1095                 /* only modify PER related information */
1096                 li->irq.pgm.per_address = irq->u.pgm.per_address;
1097                 li->irq.pgm.per_code = irq->u.pgm.per_code;
1098                 li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
1099                 li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
1100         } else if (!(irq->u.pgm.code & PGM_PER)) {
1101                 li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
1102                                    irq->u.pgm.code;
1103                 li->irq.pgm.flags = irq->u.pgm.flags;
1104                 /* only modify non-PER information */
1105                 li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
1106                 li->irq.pgm.mon_code = irq->u.pgm.mon_code;
1107                 li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
1108                 li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
1109                 li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
1110                 li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
1111         } else {
1112                 li->irq.pgm = irq->u.pgm;
1113         }
1114         set_bit(IRQ_PEND_PROG, &li->pending_irqs);
1115         return 0;
1116 }
1117
1118 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1119 {
1120         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1121
1122         VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
1123                    irq->u.ext.ext_params2);
1124         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1125                                    irq->u.ext.ext_params,
1126                                    irq->u.ext.ext_params2);
1127
1128         li->irq.ext = irq->u.ext;
1129         set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1130         atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1131         return 0;
1132 }
1133
1134 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1135 {
1136         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1137         struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1138         uint16_t src_id = irq->u.extcall.code;
1139
1140         VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1141                    src_id);
1142         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1143                                    src_id, 0);
1144
1145         /* sending vcpu invalid */
1146         if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
1147                 return -EINVAL;
1148
1149         if (sclp.has_sigpif)
1150                 return sca_inject_ext_call(vcpu, src_id);
1151
1152         if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1153                 return -EBUSY;
1154         *extcall = irq->u.extcall;
1155         atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1156         return 0;
1157 }
1158
1159 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1160 {
1161         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1162         struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1163
1164         VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1165                    irq->u.prefix.address);
1166         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1167                                    irq->u.prefix.address, 0);
1168
1169         if (!is_vcpu_stopped(vcpu))
1170                 return -EBUSY;
1171
1172         *prefix = irq->u.prefix;
1173         set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1174         return 0;
1175 }
1176
1177 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1178 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1179 {
1180         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1181         struct kvm_s390_stop_info *stop = &li->irq.stop;
1182         int rc = 0;
1183
1184         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1185
1186         if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1187                 return -EINVAL;
1188
1189         if (is_vcpu_stopped(vcpu)) {
1190                 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1191                         rc = kvm_s390_store_status_unloaded(vcpu,
1192                                                 KVM_S390_STORE_STATUS_NOADDR);
1193                 return rc;
1194         }
1195
1196         if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1197                 return -EBUSY;
1198         stop->flags = irq->u.stop.flags;
1199         __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
1200         return 0;
1201 }
1202
1203 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1204                                  struct kvm_s390_irq *irq)
1205 {
1206         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1207
1208         VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1209         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1210
1211         set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1212         return 0;
1213 }
1214
1215 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1216                                    struct kvm_s390_irq *irq)
1217 {
1218         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1219
1220         VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1221                    irq->u.emerg.code);
1222         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1223                                    irq->u.emerg.code, 0);
1224
1225         /* sending vcpu invalid */
1226         if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
1227                 return -EINVAL;
1228
1229         set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1230         set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1231         atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1232         return 0;
1233 }
1234
1235 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1236 {
1237         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1238         struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1239
1240         VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1241                    irq->u.mchk.mcic);
1242         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1243                                    irq->u.mchk.mcic);
1244
1245         /*
1246          * Because repressible machine checks can be indicated along with
1247          * exigent machine checks (PoP, Chapter 11, Interruption action)
1248          * we need to combine cr14, mcic and external damage code.
1249          * Failing storage address and the logout area should not be or'ed
1250          * together, we just indicate the last occurrence of the corresponding
1251          * machine check
1252          */
1253         mchk->cr14 |= irq->u.mchk.cr14;
1254         mchk->mcic |= irq->u.mchk.mcic;
1255         mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1256         mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1257         memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1258                sizeof(mchk->fixed_logout));
1259         if (mchk->mcic & MCHK_EX_MASK)
1260                 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1261         else if (mchk->mcic & MCHK_REP_MASK)
1262                 set_bit(IRQ_PEND_MCHK_REP,  &li->pending_irqs);
1263         return 0;
1264 }
1265
1266 static int __inject_ckc(struct kvm_vcpu *vcpu)
1267 {
1268         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1269
1270         VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1271         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1272                                    0, 0);
1273
1274         set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1275         atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1276         return 0;
1277 }
1278
1279 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1280 {
1281         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1282
1283         VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1284         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1285                                    0, 0);
1286
1287         set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1288         atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1289         return 0;
1290 }
1291
1292 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1293                                                   int isc, u32 schid)
1294 {
1295         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1296         struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1297         struct kvm_s390_interrupt_info *iter;
1298         u16 id = (schid & 0xffff0000U) >> 16;
1299         u16 nr = schid & 0x0000ffffU;
1300
1301         spin_lock(&fi->lock);
1302         list_for_each_entry(iter, isc_list, list) {
1303                 if (schid && (id != iter->io.subchannel_id ||
1304                               nr != iter->io.subchannel_nr))
1305                         continue;
1306                 /* found an appropriate entry */
1307                 list_del_init(&iter->list);
1308                 fi->counters[FIRQ_CNTR_IO] -= 1;
1309                 if (list_empty(isc_list))
1310                         clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1311                 spin_unlock(&fi->lock);
1312                 return iter;
1313         }
1314         spin_unlock(&fi->lock);
1315         return NULL;
1316 }
1317
1318 /*
1319  * Dequeue and return an I/O interrupt matching any of the interruption
1320  * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1321  */
1322 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1323                                                     u64 isc_mask, u32 schid)
1324 {
1325         struct kvm_s390_interrupt_info *inti = NULL;
1326         int isc;
1327
1328         for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1329                 if (isc_mask & isc_to_isc_bits(isc))
1330                         inti = get_io_int(kvm, isc, schid);
1331         }
1332         return inti;
1333 }
1334
1335 #define SCCB_MASK 0xFFFFFFF8
1336 #define SCCB_EVENT_PENDING 0x3
1337
1338 static int __inject_service(struct kvm *kvm,
1339                              struct kvm_s390_interrupt_info *inti)
1340 {
1341         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1342
1343         spin_lock(&fi->lock);
1344         fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1345         /*
1346          * Early versions of the QEMU s390 bios will inject several
1347          * service interrupts after another without handling a
1348          * condition code indicating busy.
1349          * We will silently ignore those superfluous sccb values.
1350          * A future version of QEMU will take care of serialization
1351          * of servc requests
1352          */
1353         if (fi->srv_signal.ext_params & SCCB_MASK)
1354                 goto out;
1355         fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1356         set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1357 out:
1358         spin_unlock(&fi->lock);
1359         kfree(inti);
1360         return 0;
1361 }
1362
1363 static int __inject_virtio(struct kvm *kvm,
1364                             struct kvm_s390_interrupt_info *inti)
1365 {
1366         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1367
1368         spin_lock(&fi->lock);
1369         if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1370                 spin_unlock(&fi->lock);
1371                 return -EBUSY;
1372         }
1373         fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1374         list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1375         set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1376         spin_unlock(&fi->lock);
1377         return 0;
1378 }
1379
1380 static int __inject_pfault_done(struct kvm *kvm,
1381                                  struct kvm_s390_interrupt_info *inti)
1382 {
1383         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1384
1385         spin_lock(&fi->lock);
1386         if (fi->counters[FIRQ_CNTR_PFAULT] >=
1387                 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1388                 spin_unlock(&fi->lock);
1389                 return -EBUSY;
1390         }
1391         fi->counters[FIRQ_CNTR_PFAULT] += 1;
1392         list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1393         set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1394         spin_unlock(&fi->lock);
1395         return 0;
1396 }
1397
1398 #define CR_PENDING_SUBCLASS 28
1399 static int __inject_float_mchk(struct kvm *kvm,
1400                                 struct kvm_s390_interrupt_info *inti)
1401 {
1402         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1403
1404         spin_lock(&fi->lock);
1405         fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1406         fi->mchk.mcic |= inti->mchk.mcic;
1407         set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1408         spin_unlock(&fi->lock);
1409         kfree(inti);
1410         return 0;
1411 }
1412
1413 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1414 {
1415         struct kvm_s390_float_interrupt *fi;
1416         struct list_head *list;
1417         int isc;
1418
1419         fi = &kvm->arch.float_int;
1420         spin_lock(&fi->lock);
1421         if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1422                 spin_unlock(&fi->lock);
1423                 return -EBUSY;
1424         }
1425         fi->counters[FIRQ_CNTR_IO] += 1;
1426
1427         if (inti->type & KVM_S390_INT_IO_AI_MASK)
1428                 VM_EVENT(kvm, 4, "%s", "inject: I/O (AI)");
1429         else
1430                 VM_EVENT(kvm, 4, "inject: I/O %x ss %x schid %04x",
1431                         inti->io.subchannel_id >> 8,
1432                         inti->io.subchannel_id >> 1 & 0x3,
1433                         inti->io.subchannel_nr);
1434         isc = int_word_to_isc(inti->io.io_int_word);
1435         list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1436         list_add_tail(&inti->list, list);
1437         set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1438         spin_unlock(&fi->lock);
1439         return 0;
1440 }
1441
1442 /*
1443  * Find a destination VCPU for a floating irq and kick it.
1444  */
1445 static void __floating_irq_kick(struct kvm *kvm, u64 type)
1446 {
1447         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1448         struct kvm_s390_local_interrupt *li;
1449         struct kvm_vcpu *dst_vcpu;
1450         int sigcpu, online_vcpus, nr_tries = 0;
1451
1452         online_vcpus = atomic_read(&kvm->online_vcpus);
1453         if (!online_vcpus)
1454                 return;
1455
1456         /* find idle VCPUs first, then round robin */
1457         sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
1458         if (sigcpu == online_vcpus) {
1459                 do {
1460                         sigcpu = fi->next_rr_cpu;
1461                         fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
1462                         /* avoid endless loops if all vcpus are stopped */
1463                         if (nr_tries++ >= online_vcpus)
1464                                 return;
1465                 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1466         }
1467         dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1468
1469         /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1470         li = &dst_vcpu->arch.local_int;
1471         spin_lock(&li->lock);
1472         switch (type) {
1473         case KVM_S390_MCHK:
1474                 atomic_or(CPUSTAT_STOP_INT, li->cpuflags);
1475                 break;
1476         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1477                 atomic_or(CPUSTAT_IO_INT, li->cpuflags);
1478                 break;
1479         default:
1480                 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1481                 break;
1482         }
1483         spin_unlock(&li->lock);
1484         kvm_s390_vcpu_wakeup(dst_vcpu);
1485 }
1486
1487 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1488 {
1489         u64 type = READ_ONCE(inti->type);
1490         int rc;
1491
1492         switch (type) {
1493         case KVM_S390_MCHK:
1494                 rc = __inject_float_mchk(kvm, inti);
1495                 break;
1496         case KVM_S390_INT_VIRTIO:
1497                 rc = __inject_virtio(kvm, inti);
1498                 break;
1499         case KVM_S390_INT_SERVICE:
1500                 rc = __inject_service(kvm, inti);
1501                 break;
1502         case KVM_S390_INT_PFAULT_DONE:
1503                 rc = __inject_pfault_done(kvm, inti);
1504                 break;
1505         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1506                 rc = __inject_io(kvm, inti);
1507                 break;
1508         default:
1509                 rc = -EINVAL;
1510         }
1511         if (rc)
1512                 return rc;
1513
1514         __floating_irq_kick(kvm, type);
1515         return 0;
1516 }
1517
1518 int kvm_s390_inject_vm(struct kvm *kvm,
1519                        struct kvm_s390_interrupt *s390int)
1520 {
1521         struct kvm_s390_interrupt_info *inti;
1522         int rc;
1523
1524         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1525         if (!inti)
1526                 return -ENOMEM;
1527
1528         inti->type = s390int->type;
1529         switch (inti->type) {
1530         case KVM_S390_INT_VIRTIO:
1531                 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1532                          s390int->parm, s390int->parm64);
1533                 inti->ext.ext_params = s390int->parm;
1534                 inti->ext.ext_params2 = s390int->parm64;
1535                 break;
1536         case KVM_S390_INT_SERVICE:
1537                 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1538                 inti->ext.ext_params = s390int->parm;
1539                 break;
1540         case KVM_S390_INT_PFAULT_DONE:
1541                 inti->ext.ext_params2 = s390int->parm64;
1542                 break;
1543         case KVM_S390_MCHK:
1544                 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1545                          s390int->parm64);
1546                 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1547                 inti->mchk.mcic = s390int->parm64;
1548                 break;
1549         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1550                 inti->io.subchannel_id = s390int->parm >> 16;
1551                 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1552                 inti->io.io_int_parm = s390int->parm64 >> 32;
1553                 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1554                 break;
1555         default:
1556                 kfree(inti);
1557                 return -EINVAL;
1558         }
1559         trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1560                                  2);
1561
1562         rc = __inject_vm(kvm, inti);
1563         if (rc)
1564                 kfree(inti);
1565         return rc;
1566 }
1567
1568 int kvm_s390_reinject_io_int(struct kvm *kvm,
1569                               struct kvm_s390_interrupt_info *inti)
1570 {
1571         return __inject_vm(kvm, inti);
1572 }
1573
1574 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1575                        struct kvm_s390_irq *irq)
1576 {
1577         irq->type = s390int->type;
1578         switch (irq->type) {
1579         case KVM_S390_PROGRAM_INT:
1580                 if (s390int->parm & 0xffff0000)
1581                         return -EINVAL;
1582                 irq->u.pgm.code = s390int->parm;
1583                 break;
1584         case KVM_S390_SIGP_SET_PREFIX:
1585                 irq->u.prefix.address = s390int->parm;
1586                 break;
1587         case KVM_S390_SIGP_STOP:
1588                 irq->u.stop.flags = s390int->parm;
1589                 break;
1590         case KVM_S390_INT_EXTERNAL_CALL:
1591                 if (s390int->parm & 0xffff0000)
1592                         return -EINVAL;
1593                 irq->u.extcall.code = s390int->parm;
1594                 break;
1595         case KVM_S390_INT_EMERGENCY:
1596                 if (s390int->parm & 0xffff0000)
1597                         return -EINVAL;
1598                 irq->u.emerg.code = s390int->parm;
1599                 break;
1600         case KVM_S390_MCHK:
1601                 irq->u.mchk.mcic = s390int->parm64;
1602                 break;
1603         }
1604         return 0;
1605 }
1606
1607 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1608 {
1609         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1610
1611         return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1612 }
1613
1614 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1615 {
1616         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1617
1618         spin_lock(&li->lock);
1619         li->irq.stop.flags = 0;
1620         clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1621         spin_unlock(&li->lock);
1622 }
1623
1624 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1625 {
1626         int rc;
1627
1628         switch (irq->type) {
1629         case KVM_S390_PROGRAM_INT:
1630                 rc = __inject_prog(vcpu, irq);
1631                 break;
1632         case KVM_S390_SIGP_SET_PREFIX:
1633                 rc = __inject_set_prefix(vcpu, irq);
1634                 break;
1635         case KVM_S390_SIGP_STOP:
1636                 rc = __inject_sigp_stop(vcpu, irq);
1637                 break;
1638         case KVM_S390_RESTART:
1639                 rc = __inject_sigp_restart(vcpu, irq);
1640                 break;
1641         case KVM_S390_INT_CLOCK_COMP:
1642                 rc = __inject_ckc(vcpu);
1643                 break;
1644         case KVM_S390_INT_CPU_TIMER:
1645                 rc = __inject_cpu_timer(vcpu);
1646                 break;
1647         case KVM_S390_INT_EXTERNAL_CALL:
1648                 rc = __inject_extcall(vcpu, irq);
1649                 break;
1650         case KVM_S390_INT_EMERGENCY:
1651                 rc = __inject_sigp_emergency(vcpu, irq);
1652                 break;
1653         case KVM_S390_MCHK:
1654                 rc = __inject_mchk(vcpu, irq);
1655                 break;
1656         case KVM_S390_INT_PFAULT_INIT:
1657                 rc = __inject_pfault_init(vcpu, irq);
1658                 break;
1659         case KVM_S390_INT_VIRTIO:
1660         case KVM_S390_INT_SERVICE:
1661         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1662         default:
1663                 rc = -EINVAL;
1664         }
1665
1666         return rc;
1667 }
1668
1669 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1670 {
1671         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1672         int rc;
1673
1674         spin_lock(&li->lock);
1675         rc = do_inject_vcpu(vcpu, irq);
1676         spin_unlock(&li->lock);
1677         if (!rc)
1678                 kvm_s390_vcpu_wakeup(vcpu);
1679         return rc;
1680 }
1681
1682 static inline void clear_irq_list(struct list_head *_list)
1683 {
1684         struct kvm_s390_interrupt_info *inti, *n;
1685
1686         list_for_each_entry_safe(inti, n, _list, list) {
1687                 list_del(&inti->list);
1688                 kfree(inti);
1689         }
1690 }
1691
1692 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1693                        struct kvm_s390_irq *irq)
1694 {
1695         irq->type = inti->type;
1696         switch (inti->type) {
1697         case KVM_S390_INT_PFAULT_INIT:
1698         case KVM_S390_INT_PFAULT_DONE:
1699         case KVM_S390_INT_VIRTIO:
1700                 irq->u.ext = inti->ext;
1701                 break;
1702         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1703                 irq->u.io = inti->io;
1704                 break;
1705         }
1706 }
1707
1708 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1709 {
1710         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1711         int i;
1712
1713         spin_lock(&fi->lock);
1714         fi->pending_irqs = 0;
1715         memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
1716         memset(&fi->mchk, 0, sizeof(fi->mchk));
1717         for (i = 0; i < FIRQ_LIST_COUNT; i++)
1718                 clear_irq_list(&fi->lists[i]);
1719         for (i = 0; i < FIRQ_MAX_COUNT; i++)
1720                 fi->counters[i] = 0;
1721         spin_unlock(&fi->lock);
1722 };
1723
1724 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1725 {
1726         struct kvm_s390_interrupt_info *inti;
1727         struct kvm_s390_float_interrupt *fi;
1728         struct kvm_s390_irq *buf;
1729         struct kvm_s390_irq *irq;
1730         int max_irqs;
1731         int ret = 0;
1732         int n = 0;
1733         int i;
1734
1735         if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
1736                 return -EINVAL;
1737
1738         /*
1739          * We are already using -ENOMEM to signal
1740          * userspace it may retry with a bigger buffer,
1741          * so we need to use something else for this case
1742          */
1743         buf = vzalloc(len);
1744         if (!buf)
1745                 return -ENOBUFS;
1746
1747         max_irqs = len / sizeof(struct kvm_s390_irq);
1748
1749         fi = &kvm->arch.float_int;
1750         spin_lock(&fi->lock);
1751         for (i = 0; i < FIRQ_LIST_COUNT; i++) {
1752                 list_for_each_entry(inti, &fi->lists[i], list) {
1753                         if (n == max_irqs) {
1754                                 /* signal userspace to try again */
1755                                 ret = -ENOMEM;
1756                                 goto out;
1757                         }
1758                         inti_to_irq(inti, &buf[n]);
1759                         n++;
1760                 }
1761         }
1762         if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
1763                 if (n == max_irqs) {
1764                         /* signal userspace to try again */
1765                         ret = -ENOMEM;
1766                         goto out;
1767                 }
1768                 irq = (struct kvm_s390_irq *) &buf[n];
1769                 irq->type = KVM_S390_INT_SERVICE;
1770                 irq->u.ext = fi->srv_signal;
1771                 n++;
1772         }
1773         if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
1774                 if (n == max_irqs) {
1775                                 /* signal userspace to try again */
1776                                 ret = -ENOMEM;
1777                                 goto out;
1778                 }
1779                 irq = (struct kvm_s390_irq *) &buf[n];
1780                 irq->type = KVM_S390_MCHK;
1781                 irq->u.mchk = fi->mchk;
1782                 n++;
1783 }
1784
1785 out:
1786         spin_unlock(&fi->lock);
1787         if (!ret && n > 0) {
1788                 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
1789                         ret = -EFAULT;
1790         }
1791         vfree(buf);
1792
1793         return ret < 0 ? ret : n;
1794 }
1795
1796 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1797 {
1798         int r;
1799
1800         switch (attr->group) {
1801         case KVM_DEV_FLIC_GET_ALL_IRQS:
1802                 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
1803                                           attr->attr);
1804                 break;
1805         default:
1806                 r = -EINVAL;
1807         }
1808
1809         return r;
1810 }
1811
1812 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1813                                      u64 addr)
1814 {
1815         struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1816         void *target = NULL;
1817         void __user *source;
1818         u64 size;
1819
1820         if (get_user(inti->type, (u64 __user *)addr))
1821                 return -EFAULT;
1822
1823         switch (inti->type) {
1824         case KVM_S390_INT_PFAULT_INIT:
1825         case KVM_S390_INT_PFAULT_DONE:
1826         case KVM_S390_INT_VIRTIO:
1827         case KVM_S390_INT_SERVICE:
1828                 target = (void *) &inti->ext;
1829                 source = &uptr->u.ext;
1830                 size = sizeof(inti->ext);
1831                 break;
1832         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1833                 target = (void *) &inti->io;
1834                 source = &uptr->u.io;
1835                 size = sizeof(inti->io);
1836                 break;
1837         case KVM_S390_MCHK:
1838                 target = (void *) &inti->mchk;
1839                 source = &uptr->u.mchk;
1840                 size = sizeof(inti->mchk);
1841                 break;
1842         default:
1843                 return -EINVAL;
1844         }
1845
1846         if (copy_from_user(target, source, size))
1847                 return -EFAULT;
1848
1849         return 0;
1850 }
1851
1852 static int enqueue_floating_irq(struct kvm_device *dev,
1853                                 struct kvm_device_attr *attr)
1854 {
1855         struct kvm_s390_interrupt_info *inti = NULL;
1856         int r = 0;
1857         int len = attr->attr;
1858
1859         if (len % sizeof(struct kvm_s390_irq) != 0)
1860                 return -EINVAL;
1861         else if (len > KVM_S390_FLIC_MAX_BUFFER)
1862                 return -EINVAL;
1863
1864         while (len >= sizeof(struct kvm_s390_irq)) {
1865                 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1866                 if (!inti)
1867                         return -ENOMEM;
1868
1869                 r = copy_irq_from_user(inti, attr->addr);
1870                 if (r) {
1871                         kfree(inti);
1872                         return r;
1873                 }
1874                 r = __inject_vm(dev->kvm, inti);
1875                 if (r) {
1876                         kfree(inti);
1877                         return r;
1878                 }
1879                 len -= sizeof(struct kvm_s390_irq);
1880                 attr->addr += sizeof(struct kvm_s390_irq);
1881         }
1882
1883         return r;
1884 }
1885
1886 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1887 {
1888         if (id >= MAX_S390_IO_ADAPTERS)
1889                 return NULL;
1890         return kvm->arch.adapters[id];
1891 }
1892
1893 static int register_io_adapter(struct kvm_device *dev,
1894                                struct kvm_device_attr *attr)
1895 {
1896         struct s390_io_adapter *adapter;
1897         struct kvm_s390_io_adapter adapter_info;
1898
1899         if (copy_from_user(&adapter_info,
1900                            (void __user *)attr->addr, sizeof(adapter_info)))
1901                 return -EFAULT;
1902
1903         if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1904             (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1905                 return -EINVAL;
1906
1907         adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1908         if (!adapter)
1909                 return -ENOMEM;
1910
1911         INIT_LIST_HEAD(&adapter->maps);
1912         init_rwsem(&adapter->maps_lock);
1913         atomic_set(&adapter->nr_maps, 0);
1914         adapter->id = adapter_info.id;
1915         adapter->isc = adapter_info.isc;
1916         adapter->maskable = adapter_info.maskable;
1917         adapter->masked = false;
1918         adapter->swap = adapter_info.swap;
1919         dev->kvm->arch.adapters[adapter->id] = adapter;
1920
1921         return 0;
1922 }
1923
1924 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1925 {
1926         int ret;
1927         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1928
1929         if (!adapter || !adapter->maskable)
1930                 return -EINVAL;
1931         ret = adapter->masked;
1932         adapter->masked = masked;
1933         return ret;
1934 }
1935
1936 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1937 {
1938         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1939         struct s390_map_info *map;
1940         int ret;
1941
1942         if (!adapter || !addr)
1943                 return -EINVAL;
1944
1945         map = kzalloc(sizeof(*map), GFP_KERNEL);
1946         if (!map) {
1947                 ret = -ENOMEM;
1948                 goto out;
1949         }
1950         INIT_LIST_HEAD(&map->list);
1951         map->guest_addr = addr;
1952         map->addr = gmap_translate(kvm->arch.gmap, addr);
1953         if (map->addr == -EFAULT) {
1954                 ret = -EFAULT;
1955                 goto out;
1956         }
1957         ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1958         if (ret < 0)
1959                 goto out;
1960         BUG_ON(ret != 1);
1961         down_write(&adapter->maps_lock);
1962         if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1963                 list_add_tail(&map->list, &adapter->maps);
1964                 ret = 0;
1965         } else {
1966                 put_page(map->page);
1967                 ret = -EINVAL;
1968         }
1969         up_write(&adapter->maps_lock);
1970 out:
1971         if (ret)
1972                 kfree(map);
1973         return ret;
1974 }
1975
1976 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1977 {
1978         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1979         struct s390_map_info *map, *tmp;
1980         int found = 0;
1981
1982         if (!adapter || !addr)
1983                 return -EINVAL;
1984
1985         down_write(&adapter->maps_lock);
1986         list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1987                 if (map->guest_addr == addr) {
1988                         found = 1;
1989                         atomic_dec(&adapter->nr_maps);
1990                         list_del(&map->list);
1991                         put_page(map->page);
1992                         kfree(map);
1993                         break;
1994                 }
1995         }
1996         up_write(&adapter->maps_lock);
1997
1998         return found ? 0 : -EINVAL;
1999 }
2000
2001 void kvm_s390_destroy_adapters(struct kvm *kvm)
2002 {
2003         int i;
2004         struct s390_map_info *map, *tmp;
2005
2006         for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
2007                 if (!kvm->arch.adapters[i])
2008                         continue;
2009                 list_for_each_entry_safe(map, tmp,
2010                                          &kvm->arch.adapters[i]->maps, list) {
2011                         list_del(&map->list);
2012                         put_page(map->page);
2013                         kfree(map);
2014                 }
2015                 kfree(kvm->arch.adapters[i]);
2016         }
2017 }
2018
2019 static int modify_io_adapter(struct kvm_device *dev,
2020                              struct kvm_device_attr *attr)
2021 {
2022         struct kvm_s390_io_adapter_req req;
2023         struct s390_io_adapter *adapter;
2024         int ret;
2025
2026         if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2027                 return -EFAULT;
2028
2029         adapter = get_io_adapter(dev->kvm, req.id);
2030         if (!adapter)
2031                 return -EINVAL;
2032         switch (req.type) {
2033         case KVM_S390_IO_ADAPTER_MASK:
2034                 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
2035                 if (ret > 0)
2036                         ret = 0;
2037                 break;
2038         case KVM_S390_IO_ADAPTER_MAP:
2039                 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
2040                 break;
2041         case KVM_S390_IO_ADAPTER_UNMAP:
2042                 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
2043                 break;
2044         default:
2045                 ret = -EINVAL;
2046         }
2047
2048         return ret;
2049 }
2050
2051 static int clear_io_irq(struct kvm *kvm, struct kvm_device_attr *attr)
2052
2053 {
2054         const u64 isc_mask = 0xffUL << 24; /* all iscs set */
2055         u32 schid;
2056
2057         if (attr->flags)
2058                 return -EINVAL;
2059         if (attr->attr != sizeof(schid))
2060                 return -EINVAL;
2061         if (copy_from_user(&schid, (void __user *) attr->addr, sizeof(schid)))
2062                 return -EFAULT;
2063         kfree(kvm_s390_get_io_int(kvm, isc_mask, schid));
2064         /*
2065          * If userspace is conforming to the architecture, we can have at most
2066          * one pending I/O interrupt per subchannel, so this is effectively a
2067          * clear all.
2068          */
2069         return 0;
2070 }
2071
2072 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2073 {
2074         int r = 0;
2075         unsigned int i;
2076         struct kvm_vcpu *vcpu;
2077
2078         switch (attr->group) {
2079         case KVM_DEV_FLIC_ENQUEUE:
2080                 r = enqueue_floating_irq(dev, attr);
2081                 break;
2082         case KVM_DEV_FLIC_CLEAR_IRQS:
2083                 kvm_s390_clear_float_irqs(dev->kvm);
2084                 break;
2085         case KVM_DEV_FLIC_APF_ENABLE:
2086                 dev->kvm->arch.gmap->pfault_enabled = 1;
2087                 break;
2088         case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2089                 dev->kvm->arch.gmap->pfault_enabled = 0;
2090                 /*
2091                  * Make sure no async faults are in transition when
2092                  * clearing the queues. So we don't need to worry
2093                  * about late coming workers.
2094                  */
2095                 synchronize_srcu(&dev->kvm->srcu);
2096                 kvm_for_each_vcpu(i, vcpu, dev->kvm)
2097                         kvm_clear_async_pf_completion_queue(vcpu);
2098                 break;
2099         case KVM_DEV_FLIC_ADAPTER_REGISTER:
2100                 r = register_io_adapter(dev, attr);
2101                 break;
2102         case KVM_DEV_FLIC_ADAPTER_MODIFY:
2103                 r = modify_io_adapter(dev, attr);
2104                 break;
2105         case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2106                 r = clear_io_irq(dev->kvm, attr);
2107                 break;
2108         default:
2109                 r = -EINVAL;
2110         }
2111
2112         return r;
2113 }
2114
2115 static int flic_has_attr(struct kvm_device *dev,
2116                              struct kvm_device_attr *attr)
2117 {
2118         switch (attr->group) {
2119         case KVM_DEV_FLIC_GET_ALL_IRQS:
2120         case KVM_DEV_FLIC_ENQUEUE:
2121         case KVM_DEV_FLIC_CLEAR_IRQS:
2122         case KVM_DEV_FLIC_APF_ENABLE:
2123         case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2124         case KVM_DEV_FLIC_ADAPTER_REGISTER:
2125         case KVM_DEV_FLIC_ADAPTER_MODIFY:
2126         case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2127                 return 0;
2128         }
2129         return -ENXIO;
2130 }
2131
2132 static int flic_create(struct kvm_device *dev, u32 type)
2133 {
2134         if (!dev)
2135                 return -EINVAL;
2136         if (dev->kvm->arch.flic)
2137                 return -EINVAL;
2138         dev->kvm->arch.flic = dev;
2139         return 0;
2140 }
2141
2142 static void flic_destroy(struct kvm_device *dev)
2143 {
2144         dev->kvm->arch.flic = NULL;
2145         kfree(dev);
2146 }
2147
2148 /* s390 floating irq controller (flic) */
2149 struct kvm_device_ops kvm_flic_ops = {
2150         .name = "kvm-flic",
2151         .get_attr = flic_get_attr,
2152         .set_attr = flic_set_attr,
2153         .has_attr = flic_has_attr,
2154         .create = flic_create,
2155         .destroy = flic_destroy,
2156 };
2157
2158 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2159 {
2160         unsigned long bit;
2161
2162         bit = bit_nr + (addr % PAGE_SIZE) * 8;
2163
2164         return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2165 }
2166
2167 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2168                                           u64 addr)
2169 {
2170         struct s390_map_info *map;
2171
2172         if (!adapter)
2173                 return NULL;
2174
2175         list_for_each_entry(map, &adapter->maps, list) {
2176                 if (map->guest_addr == addr)
2177                         return map;
2178         }
2179         return NULL;
2180 }
2181
2182 static int adapter_indicators_set(struct kvm *kvm,
2183                                   struct s390_io_adapter *adapter,
2184                                   struct kvm_s390_adapter_int *adapter_int)
2185 {
2186         unsigned long bit;
2187         int summary_set, idx;
2188         struct s390_map_info *info;
2189         void *map;
2190
2191         info = get_map_info(adapter, adapter_int->ind_addr);
2192         if (!info)
2193                 return -1;
2194         map = page_address(info->page);
2195         bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2196         set_bit(bit, map);
2197         idx = srcu_read_lock(&kvm->srcu);
2198         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2199         set_page_dirty_lock(info->page);
2200         info = get_map_info(adapter, adapter_int->summary_addr);
2201         if (!info) {
2202                 srcu_read_unlock(&kvm->srcu, idx);
2203                 return -1;
2204         }
2205         map = page_address(info->page);
2206         bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2207                           adapter->swap);
2208         summary_set = test_and_set_bit(bit, map);
2209         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2210         set_page_dirty_lock(info->page);
2211         srcu_read_unlock(&kvm->srcu, idx);
2212         return summary_set ? 0 : 1;
2213 }
2214
2215 /*
2216  * < 0 - not injected due to error
2217  * = 0 - coalesced, summary indicator already active
2218  * > 0 - injected interrupt
2219  */
2220 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2221                            struct kvm *kvm, int irq_source_id, int level,
2222                            bool line_status)
2223 {
2224         int ret;
2225         struct s390_io_adapter *adapter;
2226
2227         /* We're only interested in the 0->1 transition. */
2228         if (!level)
2229                 return 0;
2230         adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2231         if (!adapter)
2232                 return -1;
2233         down_read(&adapter->maps_lock);
2234         ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2235         up_read(&adapter->maps_lock);
2236         if ((ret > 0) && !adapter->masked) {
2237                 struct kvm_s390_interrupt s390int = {
2238                         .type = KVM_S390_INT_IO(1, 0, 0, 0),
2239                         .parm = 0,
2240                         .parm64 = (adapter->isc << 27) | 0x80000000,
2241                 };
2242                 ret = kvm_s390_inject_vm(kvm, &s390int);
2243                 if (ret == 0)
2244                         ret = 1;
2245         }
2246         return ret;
2247 }
2248
2249 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
2250                           const struct kvm_irq_routing_entry *ue)
2251 {
2252         int ret;
2253
2254         switch (ue->type) {
2255         case KVM_IRQ_ROUTING_S390_ADAPTER:
2256                 e->set = set_adapter_int;
2257                 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2258                 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2259                 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2260                 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2261                 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2262                 ret = 0;
2263                 break;
2264         default:
2265                 ret = -EINVAL;
2266         }
2267
2268         return ret;
2269 }
2270
2271 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2272                 int irq_source_id, int level, bool line_status)
2273 {
2274         return -EINVAL;
2275 }
2276
2277 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2278 {
2279         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2280         struct kvm_s390_irq *buf;
2281         int r = 0;
2282         int n;
2283
2284         buf = vmalloc(len);
2285         if (!buf)
2286                 return -ENOMEM;
2287
2288         if (copy_from_user((void *) buf, irqstate, len)) {
2289                 r = -EFAULT;
2290                 goto out_free;
2291         }
2292
2293         /*
2294          * Don't allow setting the interrupt state
2295          * when there are already interrupts pending
2296          */
2297         spin_lock(&li->lock);
2298         if (li->pending_irqs) {
2299                 r = -EBUSY;
2300                 goto out_unlock;
2301         }
2302
2303         for (n = 0; n < len / sizeof(*buf); n++) {
2304                 r = do_inject_vcpu(vcpu, &buf[n]);
2305                 if (r)
2306                         break;
2307         }
2308
2309 out_unlock:
2310         spin_unlock(&li->lock);
2311 out_free:
2312         vfree(buf);
2313
2314         return r;
2315 }
2316
2317 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2318                             struct kvm_s390_irq *irq,
2319                             unsigned long irq_type)
2320 {
2321         switch (irq_type) {
2322         case IRQ_PEND_MCHK_EX:
2323         case IRQ_PEND_MCHK_REP:
2324                 irq->type = KVM_S390_MCHK;
2325                 irq->u.mchk = li->irq.mchk;
2326                 break;
2327         case IRQ_PEND_PROG:
2328                 irq->type = KVM_S390_PROGRAM_INT;
2329                 irq->u.pgm = li->irq.pgm;
2330                 break;
2331         case IRQ_PEND_PFAULT_INIT:
2332                 irq->type = KVM_S390_INT_PFAULT_INIT;
2333                 irq->u.ext = li->irq.ext;
2334                 break;
2335         case IRQ_PEND_EXT_EXTERNAL:
2336                 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2337                 irq->u.extcall = li->irq.extcall;
2338                 break;
2339         case IRQ_PEND_EXT_CLOCK_COMP:
2340                 irq->type = KVM_S390_INT_CLOCK_COMP;
2341                 break;
2342         case IRQ_PEND_EXT_CPU_TIMER:
2343                 irq->type = KVM_S390_INT_CPU_TIMER;
2344                 break;
2345         case IRQ_PEND_SIGP_STOP:
2346                 irq->type = KVM_S390_SIGP_STOP;
2347                 irq->u.stop = li->irq.stop;
2348                 break;
2349         case IRQ_PEND_RESTART:
2350                 irq->type = KVM_S390_RESTART;
2351                 break;
2352         case IRQ_PEND_SET_PREFIX:
2353                 irq->type = KVM_S390_SIGP_SET_PREFIX;
2354                 irq->u.prefix = li->irq.prefix;
2355                 break;
2356         }
2357 }
2358
2359 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2360 {
2361         int scn;
2362         unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2363         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2364         unsigned long pending_irqs;
2365         struct kvm_s390_irq irq;
2366         unsigned long irq_type;
2367         int cpuaddr;
2368         int n = 0;
2369
2370         spin_lock(&li->lock);
2371         pending_irqs = li->pending_irqs;
2372         memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2373                sizeof(sigp_emerg_pending));
2374         spin_unlock(&li->lock);
2375
2376         for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2377                 memset(&irq, 0, sizeof(irq));
2378                 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2379                         continue;
2380                 if (n + sizeof(irq) > len)
2381                         return -ENOBUFS;
2382                 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2383                 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2384                         return -EFAULT;
2385                 n += sizeof(irq);
2386         }
2387
2388         if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2389                 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2390                         memset(&irq, 0, sizeof(irq));
2391                         if (n + sizeof(irq) > len)
2392                                 return -ENOBUFS;
2393                         irq.type = KVM_S390_INT_EMERGENCY;
2394                         irq.u.emerg.code = cpuaddr;
2395                         if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2396                                 return -EFAULT;
2397                         n += sizeof(irq);
2398                 }
2399         }
2400
2401         if (sca_ext_call_pending(vcpu, &scn)) {
2402                 if (n + sizeof(irq) > len)
2403                         return -ENOBUFS;
2404                 memset(&irq, 0, sizeof(irq));
2405                 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2406                 irq.u.extcall.code = scn;
2407                 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2408                         return -EFAULT;
2409                 n += sizeof(irq);
2410         }
2411
2412         return n;
2413 }