kernel/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 "kvm-s390.h"
  27 #include "gaccess.h"
  28 #include "trace-s390.h"
  29
  30 #define IOINT_SCHID_MASK 0x0000ffff
  31 #define IOINT_SSID_MASK 0x00030000
  32 #define IOINT_CSSID_MASK 0x03fc0000
  33 #define IOINT_AI_MASK 0x04000000
  34 #define PFAULT_INIT 0x0600
  35 #define PFAULT_DONE 0x0680
  36 #define VIRTIO_PARAM 0x0d00
  37
  38 int psw_extint_disabled(struct kvm_vcpu *vcpu)
  39 {
  40         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
  41 }
  42
  43 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
  44 {
  45         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
  46 }
  47
  48 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
  49 {
  50         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
  51 }
  52
  53 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
  54 {
  55         if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
  56             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
  57             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
  58                 return 0;
  59         return 1;
  60 }
  61
  62 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
  63 {
  64         if (psw_extint_disabled(vcpu) ||
  65             !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
  66                 return 0;
  67         if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
  68                 /* No timer interrupts when single stepping */
  69                 return 0;
  70         return 1;
  71 }
  72
  73 static int ckc_irq_pending(struct kvm_vcpu *vcpu)
  74 {
  75         if (!(vcpu->arch.sie_block->ckc <
  76               get_tod_clock_fast() + vcpu->arch.sie_block->epoch))
  77                 return 0;
  78         return ckc_interrupts_enabled(vcpu);
  79 }
  80
  81 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
  82 {
  83         return !psw_extint_disabled(vcpu) &&
  84                (vcpu->arch.sie_block->gcr[0] & 0x400ul);
  85 }
  86
  87 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
  88 {
  89         return (vcpu->arch.sie_block->cputm >> 63) &&
  90                cpu_timer_interrupts_enabled(vcpu);
  91 }
  92
  93 static inline int is_ioirq(unsigned long irq_type)
  94 {
  95         return ((irq_type >= IRQ_PEND_IO_ISC_0) &&
  96                 (irq_type <= IRQ_PEND_IO_ISC_7));
  97 }
  98
  99 static uint64_t isc_to_isc_bits(int isc)
 100 {
 101         return (0x80 >> isc) << 24;
 102 }
 103
 104 static inline u8 int_word_to_isc(u32 int_word)
 105 {
 106         return (int_word & 0x38000000) >> 27;
 107 }
 108
 109 static inline unsigned long pending_floating_irqs(struct kvm_vcpu *vcpu)
 110 {
 111         return vcpu->kvm->arch.float_int.pending_irqs;
 112 }
 113
 114 static inline unsigned long pending_local_irqs(struct kvm_vcpu *vcpu)
 115 {
 116         return vcpu->arch.local_int.pending_irqs;
 117 }
 118
 119 static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
 120                                    unsigned long active_mask)
 121 {
 122         int i;
 123
 124         for (i = 0; i <= MAX_ISC; i++)
 125                 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
 126                         active_mask &= ~(1UL << (IRQ_PEND_IO_ISC_0 + i));
 127
 128         return active_mask;
 129 }
 130
 131 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
 132 {
 133         unsigned long active_mask;
 134
 135         active_mask = pending_local_irqs(vcpu);
 136         active_mask |= pending_floating_irqs(vcpu);
 137
 138         if (psw_extint_disabled(vcpu))
 139                 active_mask &= ~IRQ_PEND_EXT_MASK;
 140         if (psw_ioint_disabled(vcpu))
 141                 active_mask &= ~IRQ_PEND_IO_MASK;
 142         else
 143                 active_mask = disable_iscs(vcpu, active_mask);
 144         if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
 145                 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
 146         if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
 147                 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
 148         if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
 149                 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
 150         if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
 151                 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
 152         if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
 153                 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
 154         if (psw_mchk_disabled(vcpu))
 155                 active_mask &= ~IRQ_PEND_MCHK_MASK;
 156         if (!(vcpu->arch.sie_block->gcr[14] &
 157               vcpu->kvm->arch.float_int.mchk.cr14))
 158                 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
 159
 160         /*
 161          * STOP irqs will never be actively delivered. They are triggered via
 162          * intercept requests and cleared when the stop intercept is performed.
 163          */
 164         __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
 165
 166         return active_mask;
 167 }
 168
 169 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
 170 {
 171         atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 172         set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 173 }
 174
 175 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
 176 {
 177         atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 178         clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 179 }
 180
 181 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
 182 {
 183         atomic_clear_mask(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
 184                           &vcpu->arch.sie_block->cpuflags);
 185         vcpu->arch.sie_block->lctl = 0x0000;
 186         vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
 187
 188         if (guestdbg_enabled(vcpu)) {
 189                 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
 190                                                LCTL_CR10 | LCTL_CR11);
 191                 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
 192         }
 193 }
 194
 195 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
 196 {
 197         atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
 198 }
 199
 200 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
 201 {
 202         if (!(pending_floating_irqs(vcpu) & IRQ_PEND_IO_MASK))
 203                 return;
 204         else if (psw_ioint_disabled(vcpu))
 205                 __set_cpuflag(vcpu, CPUSTAT_IO_INT);
 206         else
 207                 vcpu->arch.sie_block->lctl |= LCTL_CR6;
 208 }
 209
 210 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
 211 {
 212         if (!(pending_local_irqs(vcpu) & IRQ_PEND_EXT_MASK))
 213                 return;
 214         if (psw_extint_disabled(vcpu))
 215                 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
 216         else
 217                 vcpu->arch.sie_block->lctl |= LCTL_CR0;
 218 }
 219
 220 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
 221 {
 222         if (!(pending_local_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
 223                 return;
 224         if (psw_mchk_disabled(vcpu))
 225                 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
 226         else
 227                 vcpu->arch.sie_block->lctl |= LCTL_CR14;
 228 }
 229
 230 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
 231 {
 232         if (kvm_s390_is_stop_irq_pending(vcpu))
 233                 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
 234 }
 235
 236 /* Set interception request for non-deliverable interrupts */
 237 static void set_intercept_indicators(struct kvm_vcpu *vcpu)
 238 {
 239         set_intercept_indicators_io(vcpu);
 240         set_intercept_indicators_ext(vcpu);
 241         set_intercept_indicators_mchk(vcpu);
 242         set_intercept_indicators_stop(vcpu);
 243 }
 244
 245 static u16 get_ilc(struct kvm_vcpu *vcpu)
 246 {
 247         switch (vcpu->arch.sie_block->icptcode) {
 248         case ICPT_INST:
 249         case ICPT_INSTPROGI:
 250         case ICPT_OPEREXC:
 251         case ICPT_PARTEXEC:
 252         case ICPT_IOINST:
 253                 /* last instruction only stored for these icptcodes */
 254                 return insn_length(vcpu->arch.sie_block->ipa >> 8);
 255         case ICPT_PROGI:
 256                 return vcpu->arch.sie_block->pgmilc;
 257         default:
 258                 return 0;
 259         }
 260 }
 261
 262 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
 263 {
 264         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 265         int rc;
 266
 267         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
 268                                          0, 0);
 269
 270         rc  = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
 271                            (u16 *)__LC_EXT_INT_CODE);
 272         rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 273         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 274                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 275         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 276                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 277         clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
 278         return rc ? -EFAULT : 0;
 279 }
 280
 281 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
 282 {
 283         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 284         int rc;
 285
 286         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
 287                                          0, 0);
 288
 289         rc  = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
 290                            (u16 __user *)__LC_EXT_INT_CODE);
 291         rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 292         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 293                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 294         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 295                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 296         clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
 297         return rc ? -EFAULT : 0;
 298 }
 299
 300 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
 301 {
 302         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 303         struct kvm_s390_ext_info ext;
 304         int rc;
 305
 306         spin_lock(&li->lock);
 307         ext = li->irq.ext;
 308         clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
 309         li->irq.ext.ext_params2 = 0;
 310         spin_unlock(&li->lock);
 311
 312         VCPU_EVENT(vcpu, 4, "interrupt: pfault init parm:%x,parm64:%llx",
 313                    0, ext.ext_params2);
 314         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 315                                          KVM_S390_INT_PFAULT_INIT,
 316                                          0, ext.ext_params2);
 317
 318         rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
 319         rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
 320         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 321                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 322         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 323                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 324         rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
 325         return rc ? -EFAULT : 0;
 326 }
 327
 328 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
 329 {
 330         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 331         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 332         struct kvm_s390_mchk_info mchk = {};
 333         unsigned long adtl_status_addr;
 334         int deliver = 0;
 335         int rc = 0;
 336
 337         spin_lock(&fi->lock);
 338         spin_lock(&li->lock);
 339         if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
 340             test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
 341                 /*
 342                  * If there was an exigent machine check pending, then any
 343                  * repressible machine checks that might have been pending
 344                  * are indicated along with it, so always clear bits for
 345                  * repressible and exigent interrupts
 346                  */
 347                 mchk = li->irq.mchk;
 348                 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
 349                 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
 350                 memset(&li->irq.mchk, 0, sizeof(mchk));
 351                 deliver = 1;
 352         }
 353         /*
 354          * We indicate floating repressible conditions along with
 355          * other pending conditions. Channel Report Pending and Channel
 356          * Subsystem damage are the only two and and are indicated by
 357          * bits in mcic and masked in cr14.
 358          */
 359         if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
 360                 mchk.mcic |= fi->mchk.mcic;
 361                 mchk.cr14 |= fi->mchk.cr14;
 362                 memset(&fi->mchk, 0, sizeof(mchk));
 363                 deliver = 1;
 364         }
 365         spin_unlock(&li->lock);
 366         spin_unlock(&fi->lock);
 367
 368         if (deliver) {
 369                 VCPU_EVENT(vcpu, 4, "interrupt: machine check mcic=%llx",
 370                            mchk.mcic);
 371                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 372                                                  KVM_S390_MCHK,
 373                                                  mchk.cr14, mchk.mcic);
 374
 375                 rc  = kvm_s390_vcpu_store_status(vcpu,
 376                                                  KVM_S390_STORE_STATUS_PREFIXED);
 377                 rc |= read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR,
 378                                     &adtl_status_addr,
 379                                     sizeof(unsigned long));
 380                 rc |= kvm_s390_vcpu_store_adtl_status(vcpu,
 381                                                       adtl_status_addr);
 382                 rc |= put_guest_lc(vcpu, mchk.mcic,
 383                                    (u64 __user *) __LC_MCCK_CODE);
 384                 rc |= put_guest_lc(vcpu, mchk.failing_storage_address,
 385                                    (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
 386                 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA,
 387                                      &mchk.fixed_logout,
 388                                      sizeof(mchk.fixed_logout));
 389                 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
 390                                      &vcpu->arch.sie_block->gpsw,
 391                                      sizeof(psw_t));
 392                 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
 393                                     &vcpu->arch.sie_block->gpsw,
 394                                     sizeof(psw_t));
 395         }
 396         return rc ? -EFAULT : 0;
 397 }
 398
 399 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
 400 {
 401         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 402         int rc;
 403
 404         VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
 405         vcpu->stat.deliver_restart_signal++;
 406         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
 407
 408         rc  = write_guest_lc(vcpu,
 409                              offsetof(struct _lowcore, restart_old_psw),
 410                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 411         rc |= read_guest_lc(vcpu, offsetof(struct _lowcore, restart_psw),
 412                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 413         clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
 414         return rc ? -EFAULT : 0;
 415 }
 416
 417 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
 418 {
 419         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 420         struct kvm_s390_prefix_info prefix;
 421
 422         spin_lock(&li->lock);
 423         prefix = li->irq.prefix;
 424         li->irq.prefix.address = 0;
 425         clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
 426         spin_unlock(&li->lock);
 427
 428         VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x", prefix.address);
 429         vcpu->stat.deliver_prefix_signal++;
 430         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 431                                          KVM_S390_SIGP_SET_PREFIX,
 432                                          prefix.address, 0);
 433
 434         kvm_s390_set_prefix(vcpu, prefix.address);
 435         return 0;
 436 }
 437
 438 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
 439 {
 440         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 441         int rc;
 442         int cpu_addr;
 443
 444         spin_lock(&li->lock);
 445         cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
 446         clear_bit(cpu_addr, li->sigp_emerg_pending);
 447         if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
 448                 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
 449         spin_unlock(&li->lock);
 450
 451         VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
 452         vcpu->stat.deliver_emergency_signal++;
 453         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
 454                                          cpu_addr, 0);
 455
 456         rc  = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
 457                            (u16 *)__LC_EXT_INT_CODE);
 458         rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
 459         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 460                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 461         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 462                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 463         return rc ? -EFAULT : 0;
 464 }
 465
 466 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
 467 {
 468         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 469         struct kvm_s390_extcall_info extcall;
 470         int rc;
 471
 472         spin_lock(&li->lock);
 473         extcall = li->irq.extcall;
 474         li->irq.extcall.code = 0;
 475         clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
 476         spin_unlock(&li->lock);
 477
 478         VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call");
 479         vcpu->stat.deliver_external_call++;
 480         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 481                                          KVM_S390_INT_EXTERNAL_CALL,
 482                                          extcall.code, 0);
 483
 484         rc  = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
 485                            (u16 *)__LC_EXT_INT_CODE);
 486         rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
 487         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 488                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 489         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
 490                             sizeof(psw_t));
 491         return rc ? -EFAULT : 0;
 492 }
 493
 494 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
 495 {
 496         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 497         struct kvm_s390_pgm_info pgm_info;
 498         int rc = 0, nullifying = false;
 499         u16 ilc = get_ilc(vcpu);
 500
 501         spin_lock(&li->lock);
 502         pgm_info = li->irq.pgm;
 503         clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
 504         memset(&li->irq.pgm, 0, sizeof(pgm_info));
 505         spin_unlock(&li->lock);
 506
 507         VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
 508                    pgm_info.code, ilc);
 509         vcpu->stat.deliver_program_int++;
 510         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
 511                                          pgm_info.code, 0);
 512
 513         switch (pgm_info.code & ~PGM_PER) {
 514         case PGM_AFX_TRANSLATION:
 515         case PGM_ASX_TRANSLATION:
 516         case PGM_EX_TRANSLATION:
 517         case PGM_LFX_TRANSLATION:
 518         case PGM_LSTE_SEQUENCE:
 519         case PGM_LSX_TRANSLATION:
 520         case PGM_LX_TRANSLATION:
 521         case PGM_PRIMARY_AUTHORITY:
 522         case PGM_SECONDARY_AUTHORITY:
 523                 nullifying = true;
 524                 /* fall through */
 525         case PGM_SPACE_SWITCH:
 526                 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
 527                                   (u64 *)__LC_TRANS_EXC_CODE);
 528                 break;
 529         case PGM_ALEN_TRANSLATION:
 530         case PGM_ALE_SEQUENCE:
 531         case PGM_ASTE_INSTANCE:
 532         case PGM_ASTE_SEQUENCE:
 533         case PGM_ASTE_VALIDITY:
 534         case PGM_EXTENDED_AUTHORITY:
 535                 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
 536                                   (u8 *)__LC_EXC_ACCESS_ID);
 537                 nullifying = true;
 538                 break;
 539         case PGM_ASCE_TYPE:
 540         case PGM_PAGE_TRANSLATION:
 541         case PGM_REGION_FIRST_TRANS:
 542         case PGM_REGION_SECOND_TRANS:
 543         case PGM_REGION_THIRD_TRANS:
 544         case PGM_SEGMENT_TRANSLATION:
 545                 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
 546                                   (u64 *)__LC_TRANS_EXC_CODE);
 547                 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
 548                                    (u8 *)__LC_EXC_ACCESS_ID);
 549                 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
 550                                    (u8 *)__LC_OP_ACCESS_ID);
 551                 nullifying = true;
 552                 break;
 553         case PGM_MONITOR:
 554                 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
 555                                   (u16 *)__LC_MON_CLASS_NR);
 556                 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
 557                                    (u64 *)__LC_MON_CODE);
 558                 break;
 559         case PGM_VECTOR_PROCESSING:
 560         case PGM_DATA:
 561                 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
 562                                   (u32 *)__LC_DATA_EXC_CODE);
 563                 break;
 564         case PGM_PROTECTION:
 565                 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
 566                                   (u64 *)__LC_TRANS_EXC_CODE);
 567                 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
 568                                    (u8 *)__LC_EXC_ACCESS_ID);
 569                 break;
 570         case PGM_STACK_FULL:
 571         case PGM_STACK_EMPTY:
 572         case PGM_STACK_SPECIFICATION:
 573         case PGM_STACK_TYPE:
 574         case PGM_STACK_OPERATION:
 575         case PGM_TRACE_TABEL:
 576         case PGM_CRYPTO_OPERATION:
 577                 nullifying = true;
 578                 break;
 579         }
 580
 581         if (pgm_info.code & PGM_PER) {
 582                 rc |= put_guest_lc(vcpu, pgm_info.per_code,
 583                                    (u8 *) __LC_PER_CODE);
 584                 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
 585                                    (u8 *)__LC_PER_ATMID);
 586                 rc |= put_guest_lc(vcpu, pgm_info.per_address,
 587                                    (u64 *) __LC_PER_ADDRESS);
 588                 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
 589                                    (u8 *) __LC_PER_ACCESS_ID);
 590         }
 591
 592         if (nullifying && vcpu->arch.sie_block->icptcode == ICPT_INST)
 593                 kvm_s390_rewind_psw(vcpu, ilc);
 594
 595         rc |= put_guest_lc(vcpu, ilc, (u16 *) __LC_PGM_ILC);
 596         rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
 597                                  (u64 *) __LC_LAST_BREAK);
 598         rc |= put_guest_lc(vcpu, pgm_info.code,
 599                            (u16 *)__LC_PGM_INT_CODE);
 600         rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
 601                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 602         rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
 603                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 604         return rc ? -EFAULT : 0;
 605 }
 606
 607 static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
 608 {
 609         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 610         struct kvm_s390_ext_info ext;
 611         int rc = 0;
 612
 613         spin_lock(&fi->lock);
 614         if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
 615                 spin_unlock(&fi->lock);
 616                 return 0;
 617         }
 618         ext = fi->srv_signal;
 619         memset(&fi->srv_signal, 0, sizeof(ext));
 620         clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
 621         spin_unlock(&fi->lock);
 622
 623         VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
 624                    ext.ext_params);
 625         vcpu->stat.deliver_service_signal++;
 626         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
 627                                          ext.ext_params, 0);
 628
 629         rc  = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
 630         rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 631         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 632                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 633         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 634                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 635         rc |= put_guest_lc(vcpu, ext.ext_params,
 636                            (u32 *)__LC_EXT_PARAMS);
 637
 638         return rc ? -EFAULT : 0;
 639 }
 640
 641 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
 642 {
 643         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 644         struct kvm_s390_interrupt_info *inti;
 645         int rc = 0;
 646
 647         spin_lock(&fi->lock);
 648         inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
 649                                         struct kvm_s390_interrupt_info,
 650                                         list);
 651         if (inti) {
 652                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 653                                 KVM_S390_INT_PFAULT_DONE, 0,
 654                                 inti->ext.ext_params2);
 655                 list_del(&inti->list);
 656                 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
 657         }
 658         if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
 659                 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
 660         spin_unlock(&fi->lock);
 661
 662         if (inti) {
 663                 rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
 664                                 (u16 *)__LC_EXT_INT_CODE);
 665                 rc |= put_guest_lc(vcpu, PFAULT_DONE,
 666                                 (u16 *)__LC_EXT_CPU_ADDR);
 667                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 668                                 &vcpu->arch.sie_block->gpsw,
 669                                 sizeof(psw_t));
 670                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 671                                 &vcpu->arch.sie_block->gpsw,
 672                                 sizeof(psw_t));
 673                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 674                                 (u64 *)__LC_EXT_PARAMS2);
 675                 kfree(inti);
 676         }
 677         return rc ? -EFAULT : 0;
 678 }
 679
 680 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
 681 {
 682         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 683         struct kvm_s390_interrupt_info *inti;
 684         int rc = 0;
 685
 686         spin_lock(&fi->lock);
 687         inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
 688                                         struct kvm_s390_interrupt_info,
 689                                         list);
 690         if (inti) {
 691                 VCPU_EVENT(vcpu, 4,
 692                            "interrupt: virtio parm:%x,parm64:%llx",
 693                            inti->ext.ext_params, inti->ext.ext_params2);
 694                 vcpu->stat.deliver_virtio_interrupt++;
 695                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 696                                 inti->type,
 697                                 inti->ext.ext_params,
 698                                 inti->ext.ext_params2);
 699                 list_del(&inti->list);
 700                 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
 701         }
 702         if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
 703                 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
 704         spin_unlock(&fi->lock);
 705
 706         if (inti) {
 707                 rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
 708                                 (u16 *)__LC_EXT_INT_CODE);
 709                 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
 710                                 (u16 *)__LC_EXT_CPU_ADDR);
 711                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 712                                 &vcpu->arch.sie_block->gpsw,
 713                                 sizeof(psw_t));
 714                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 715                                 &vcpu->arch.sie_block->gpsw,
 716                                 sizeof(psw_t));
 717                 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
 718                                 (u32 *)__LC_EXT_PARAMS);
 719                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 720                                 (u64 *)__LC_EXT_PARAMS2);
 721                 kfree(inti);
 722         }
 723         return rc ? -EFAULT : 0;
 724 }
 725
 726 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
 727                                      unsigned long irq_type)
 728 {
 729         struct list_head *isc_list;
 730         struct kvm_s390_float_interrupt *fi;
 731         struct kvm_s390_interrupt_info *inti = NULL;
 732         int rc = 0;
 733
 734         fi = &vcpu->kvm->arch.float_int;
 735
 736         spin_lock(&fi->lock);
 737         isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0];
 738         inti = list_first_entry_or_null(isc_list,
 739                                         struct kvm_s390_interrupt_info,
 740                                         list);
 741         if (inti) {
 742                 VCPU_EVENT(vcpu, 4, "interrupt: I/O %llx", inti->type);
 743                 vcpu->stat.deliver_io_int++;
 744                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 745                                 inti->type,
 746                                 ((__u32)inti->io.subchannel_id << 16) |
 747                                 inti->io.subchannel_nr,
 748                                 ((__u64)inti->io.io_int_parm << 32) |
 749                                 inti->io.io_int_word);
 750                 list_del(&inti->list);
 751                 fi->counters[FIRQ_CNTR_IO] -= 1;
 752         }
 753         if (list_empty(isc_list))
 754                 clear_bit(irq_type, &fi->pending_irqs);
 755         spin_unlock(&fi->lock);
 756
 757         if (inti) {
 758                 rc  = put_guest_lc(vcpu, inti->io.subchannel_id,
 759                                 (u16 *)__LC_SUBCHANNEL_ID);
 760                 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
 761                                 (u16 *)__LC_SUBCHANNEL_NR);
 762                 rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
 763                                 (u32 *)__LC_IO_INT_PARM);
 764                 rc |= put_guest_lc(vcpu, inti->io.io_int_word,
 765                                 (u32 *)__LC_IO_INT_WORD);
 766                 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
 767                                 &vcpu->arch.sie_block->gpsw,
 768                                 sizeof(psw_t));
 769                 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
 770                                 &vcpu->arch.sie_block->gpsw,
 771                                 sizeof(psw_t));
 772                 kfree(inti);
 773         }
 774
 775         return rc ? -EFAULT : 0;
 776 }
 777
 778 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);
 779
 780 static const deliver_irq_t deliver_irq_funcs[] = {
 781         [IRQ_PEND_MCHK_EX]        = __deliver_machine_check,
 782         [IRQ_PEND_MCHK_REP]       = __deliver_machine_check,
 783         [IRQ_PEND_PROG]           = __deliver_prog,
 784         [IRQ_PEND_EXT_EMERGENCY]  = __deliver_emergency_signal,
 785         [IRQ_PEND_EXT_EXTERNAL]   = __deliver_external_call,
 786         [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc,
 787         [IRQ_PEND_EXT_CPU_TIMER]  = __deliver_cpu_timer,
 788         [IRQ_PEND_RESTART]        = __deliver_restart,
 789         [IRQ_PEND_SET_PREFIX]     = __deliver_set_prefix,
 790         [IRQ_PEND_PFAULT_INIT]    = __deliver_pfault_init,
 791         [IRQ_PEND_EXT_SERVICE]    = __deliver_service,
 792         [IRQ_PEND_PFAULT_DONE]    = __deliver_pfault_done,
 793         [IRQ_PEND_VIRTIO]         = __deliver_virtio,
 794 };
 795
 796 /* Check whether an external call is pending (deliverable or not) */
 797 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
 798 {
 799         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 800         uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
 801
 802         if (!sclp_has_sigpif())
 803                 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
 804
 805         return (sigp_ctrl & SIGP_CTRL_C) &&
 806                (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND);
 807 }
 808
 809 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
 810 {
 811         int rc;
 812
 813         rc = !!deliverable_irqs(vcpu);
 814
 815         if (!rc && kvm_cpu_has_pending_timer(vcpu))
 816                 rc = 1;
 817
 818         /* external call pending and deliverable */
 819         if (!rc && kvm_s390_ext_call_pending(vcpu) &&
 820             !psw_extint_disabled(vcpu) &&
 821             (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
 822                 rc = 1;
 823
 824         if (!rc && !exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
 825                 rc = 1;
 826
 827         return rc;
 828 }
 829
 830 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 831 {
 832         return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
 833 }
 834
 835 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
 836 {
 837         u64 now, sltime;
 838
 839         vcpu->stat.exit_wait_state++;
 840
 841         /* fast path */
 842         if (kvm_cpu_has_pending_timer(vcpu) || kvm_arch_vcpu_runnable(vcpu))
 843                 return 0;
 844
 845         if (psw_interrupts_disabled(vcpu)) {
 846                 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
 847                 return -EOPNOTSUPP; /* disabled wait */
 848         }
 849
 850         if (!ckc_interrupts_enabled(vcpu)) {
 851                 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
 852                 __set_cpu_idle(vcpu);
 853                 goto no_timer;
 854         }
 855
 856         now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
 857         sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
 858
 859         /* underflow */
 860         if (vcpu->arch.sie_block->ckc < now)
 861                 return 0;
 862
 863         __set_cpu_idle(vcpu);
 864         hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
 865         VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
 866 no_timer:
 867         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
 868         kvm_vcpu_block(vcpu);
 869         __unset_cpu_idle(vcpu);
 870         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
 871
 872         hrtimer_cancel(&vcpu->arch.ckc_timer);
 873         return 0;
 874 }
 875
 876 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
 877 {
 878         if (swaitqueue_active(&vcpu->wq)) {
 879                 /*
 880                  * The vcpu gave up the cpu voluntarily, mark it as a good
 881                  * yield-candidate.
 882                  */
 883                 vcpu->preempted = true;
 884                 swait_wake_interruptible(&vcpu->wq);
 885                 vcpu->stat.halt_wakeup++;
 886         }
 887 }
 888
 889 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
 890 {
 891         struct kvm_vcpu *vcpu;
 892         u64 now, sltime;
 893
 894         vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
 895         now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
 896         sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
 897
 898         /*
 899          * If the monotonic clock runs faster than the tod clock we might be
 900          * woken up too early and have to go back to sleep to avoid deadlocks.
 901          */
 902         if (vcpu->arch.sie_block->ckc > now &&
 903             hrtimer_forward_now(timer, ns_to_ktime(sltime)))
 904                 return HRTIMER_RESTART;
 905         kvm_s390_vcpu_wakeup(vcpu);
 906         return HRTIMER_NORESTART;
 907 }
 908
 909 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
 910 {
 911         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 912
 913         spin_lock(&li->lock);
 914         li->pending_irqs = 0;
 915         bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
 916         memset(&li->irq, 0, sizeof(li->irq));
 917         spin_unlock(&li->lock);
 918
 919         /* clear pending external calls set by sigp interpretation facility */
 920         atomic_clear_mask(CPUSTAT_ECALL_PEND, li->cpuflags);
 921         vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl = 0;
 922 }
 923
 924 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
 925 {
 926         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 927         deliver_irq_t func;
 928         int rc = 0;
 929         unsigned long irq_type;
 930         unsigned long irqs;
 931
 932         __reset_intercept_indicators(vcpu);
 933
 934         /* pending ckc conditions might have been invalidated */
 935         clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
 936         if (ckc_irq_pending(vcpu))
 937                 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
 938
 939         /* pending cpu timer conditions might have been invalidated */
 940         clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
 941         if (cpu_timer_irq_pending(vcpu))
 942                 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
 943
 944         do {
 945                 irqs = deliverable_irqs(vcpu);
 946                 /* bits are in the order of interrupt priority */
 947                 irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT);
 948                 if (irq_type == IRQ_PEND_COUNT)
 949                         break;
 950                 if (is_ioirq(irq_type)) {
 951                         rc = __deliver_io(vcpu, irq_type);
 952                 } else {
 953                         func = deliver_irq_funcs[irq_type];
 954                         if (!func) {
 955                                 WARN_ON_ONCE(func == NULL);
 956                                 clear_bit(irq_type, &li->pending_irqs);
 957                                 continue;
 958                         }
 959                         rc = func(vcpu);
 960                 }
 961                 if (rc)
 962                         break;
 963         } while (!rc);
 964
 965         set_intercept_indicators(vcpu);
 966
 967         return rc;
 968 }
 969
 970 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
 971 {
 972         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 973
 974         li->irq.pgm = irq->u.pgm;
 975         set_bit(IRQ_PEND_PROG, &li->pending_irqs);
 976         return 0;
 977 }
 978
 979 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 980 {
 981         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 982         struct kvm_s390_irq irq;
 983
 984         VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
 985         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT, code,
 986                                    0, 1);
 987         spin_lock(&li->lock);
 988         irq.u.pgm.code = code;
 989         __inject_prog(vcpu, &irq);
 990         BUG_ON(swaitqueue_active(li->wq));
 991         spin_unlock(&li->lock);
 992         return 0;
 993 }
 994
 995 int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
 996                              struct kvm_s390_pgm_info *pgm_info)
 997 {
 998         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 999         struct kvm_s390_irq irq;
1000         int rc;
1001
1002         VCPU_EVENT(vcpu, 3, "inject: prog irq %d (from kernel)",
1003                    pgm_info->code);
1004         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
1005                                    pgm_info->code, 0, 1);
1006         spin_lock(&li->lock);
1007         irq.u.pgm = *pgm_info;
1008         rc = __inject_prog(vcpu, &irq);
1009         BUG_ON(swaitqueue_active(li->wq));
1010         spin_unlock(&li->lock);
1011         return rc;
1012 }
1013
1014 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1015 {
1016         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1017
1018         VCPU_EVENT(vcpu, 3, "inject: external irq params:%x, params2:%llx",
1019                    irq->u.ext.ext_params, irq->u.ext.ext_params2);
1020         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1021                                    irq->u.ext.ext_params,
1022                                    irq->u.ext.ext_params2, 2);
1023
1024         li->irq.ext = irq->u.ext;
1025         set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1026         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1027         return 0;
1028 }
1029
1030 static int __inject_extcall_sigpif(struct kvm_vcpu *vcpu, uint16_t src_id)
1031 {
1032         unsigned char new_val, old_val;
1033         uint8_t *sigp_ctrl = &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
1034
1035         new_val = SIGP_CTRL_C | (src_id & SIGP_CTRL_SCN_MASK);
1036         old_val = *sigp_ctrl & ~SIGP_CTRL_C;
1037         if (cmpxchg(sigp_ctrl, old_val, new_val) != old_val) {
1038                 /* another external call is pending */
1039                 return -EBUSY;
1040         }
1041         atomic_set_mask(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
1042         return 0;
1043 }
1044
1045 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1046 {
1047         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1048         struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1049         uint16_t src_id = irq->u.extcall.code;
1050
1051         VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u",
1052                    src_id);
1053         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1054                                    src_id, 0, 2);
1055
1056         /* sending vcpu invalid */
1057         if (src_id >= KVM_MAX_VCPUS ||
1058             kvm_get_vcpu(vcpu->kvm, src_id) == NULL)
1059                 return -EINVAL;
1060
1061         if (sclp_has_sigpif())
1062                 return __inject_extcall_sigpif(vcpu, src_id);
1063
1064         if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1065                 return -EBUSY;
1066         *extcall = irq->u.extcall;
1067         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1068         return 0;
1069 }
1070
1071 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1072 {
1073         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1074         struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1075
1076         VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
1077                    irq->u.prefix.address);
1078         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1079                                    irq->u.prefix.address, 0, 2);
1080
1081         if (!is_vcpu_stopped(vcpu))
1082                 return -EBUSY;
1083
1084         *prefix = irq->u.prefix;
1085         set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1086         return 0;
1087 }
1088
1089 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1090 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1091 {
1092         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1093         struct kvm_s390_stop_info *stop = &li->irq.stop;
1094         int rc = 0;
1095
1096         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0, 2);
1097
1098         if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1099                 return -EINVAL;
1100
1101         if (is_vcpu_stopped(vcpu)) {
1102                 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1103                         rc = kvm_s390_store_status_unloaded(vcpu,
1104                                                 KVM_S390_STORE_STATUS_NOADDR);
1105                 return rc;
1106         }
1107
1108         if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1109                 return -EBUSY;
1110         stop->flags = irq->u.stop.flags;
1111         __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
1112         return 0;
1113 }
1114
1115 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1116                                  struct kvm_s390_irq *irq)
1117 {
1118         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1119
1120         VCPU_EVENT(vcpu, 3, "inject: restart type %llx", irq->type);
1121         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0, 2);
1122
1123         set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1124         return 0;
1125 }
1126
1127 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1128                                    struct kvm_s390_irq *irq)
1129 {
1130         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1131
1132         VCPU_EVENT(vcpu, 3, "inject: emergency %u\n",
1133                    irq->u.emerg.code);
1134         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1135                                    irq->u.emerg.code, 0, 2);
1136
1137         set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1138         set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1139         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1140         return 0;
1141 }
1142
1143 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1144 {
1145         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1146         struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1147
1148         VCPU_EVENT(vcpu, 5, "inject: machine check parm64:%llx",
1149                    irq->u.mchk.mcic);
1150         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1151                                    irq->u.mchk.mcic, 2);
1152
1153         /*
1154          * Because repressible machine checks can be indicated along with
1155          * exigent machine checks (PoP, Chapter 11, Interruption action)
1156          * we need to combine cr14, mcic and external damage code.
1157          * Failing storage address and the logout area should not be or'ed
1158          * together, we just indicate the last occurrence of the corresponding
1159          * machine check
1160          */
1161         mchk->cr14 |= irq->u.mchk.cr14;
1162         mchk->mcic |= irq->u.mchk.mcic;
1163         mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1164         mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1165         memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1166                sizeof(mchk->fixed_logout));
1167         if (mchk->mcic & MCHK_EX_MASK)
1168                 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1169         else if (mchk->mcic & MCHK_REP_MASK)
1170                 set_bit(IRQ_PEND_MCHK_REP,  &li->pending_irqs);
1171         return 0;
1172 }
1173
1174 static int __inject_ckc(struct kvm_vcpu *vcpu)
1175 {
1176         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1177
1178         VCPU_EVENT(vcpu, 3, "inject: type %x", KVM_S390_INT_CLOCK_COMP);
1179         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1180                                    0, 0, 2);
1181
1182         set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1183         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1184         return 0;
1185 }
1186
1187 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1188 {
1189         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1190
1191         VCPU_EVENT(vcpu, 3, "inject: type %x", KVM_S390_INT_CPU_TIMER);
1192         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1193                                    0, 0, 2);
1194
1195         set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1196         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1197         return 0;
1198 }
1199
1200 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1201                                                   int isc, u32 schid)
1202 {
1203         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1204         struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1205         struct kvm_s390_interrupt_info *iter;
1206         u16 id = (schid & 0xffff0000U) >> 16;
1207         u16 nr = schid & 0x0000ffffU;
1208
1209         spin_lock(&fi->lock);
1210         list_for_each_entry(iter, isc_list, list) {
1211                 if (schid && (id != iter->io.subchannel_id ||
1212                               nr != iter->io.subchannel_nr))
1213                         continue;
1214                 /* found an appropriate entry */
1215                 list_del_init(&iter->list);
1216                 fi->counters[FIRQ_CNTR_IO] -= 1;
1217                 if (list_empty(isc_list))
1218                         clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1219                 spin_unlock(&fi->lock);
1220                 return iter;
1221         }
1222         spin_unlock(&fi->lock);
1223         return NULL;
1224 }
1225
1226 /*
1227  * Dequeue and return an I/O interrupt matching any of the interruption
1228  * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1229  */
1230 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1231                                                     u64 isc_mask, u32 schid)
1232 {
1233         struct kvm_s390_interrupt_info *inti = NULL;
1234         int isc;
1235
1236         for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1237                 if (isc_mask & isc_to_isc_bits(isc))
1238                         inti = get_io_int(kvm, isc, schid);
1239         }
1240         return inti;
1241 }
1242
1243 #define SCCB_MASK 0xFFFFFFF8
1244 #define SCCB_EVENT_PENDING 0x3
1245
1246 static int __inject_service(struct kvm *kvm,
1247                              struct kvm_s390_interrupt_info *inti)
1248 {
1249         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1250
1251         spin_lock(&fi->lock);
1252         fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1253         /*
1254          * Early versions of the QEMU s390 bios will inject several
1255          * service interrupts after another without handling a
1256          * condition code indicating busy.
1257          * We will silently ignore those superfluous sccb values.
1258          * A future version of QEMU will take care of serialization
1259          * of servc requests
1260          */
1261         if (fi->srv_signal.ext_params & SCCB_MASK)
1262                 goto out;
1263         fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1264         set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1265 out:
1266         spin_unlock(&fi->lock);
1267         kfree(inti);
1268         return 0;
1269 }
1270
1271 static int __inject_virtio(struct kvm *kvm,
1272                             struct kvm_s390_interrupt_info *inti)
1273 {
1274         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1275
1276         spin_lock(&fi->lock);
1277         if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1278                 spin_unlock(&fi->lock);
1279                 return -EBUSY;
1280         }
1281         fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1282         list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1283         set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1284         spin_unlock(&fi->lock);
1285         return 0;
1286 }
1287
1288 static int __inject_pfault_done(struct kvm *kvm,
1289                                  struct kvm_s390_interrupt_info *inti)
1290 {
1291         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1292
1293         spin_lock(&fi->lock);
1294         if (fi->counters[FIRQ_CNTR_PFAULT] >=
1295                 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1296                 spin_unlock(&fi->lock);
1297                 return -EBUSY;
1298         }
1299         fi->counters[FIRQ_CNTR_PFAULT] += 1;
1300         list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1301         set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1302         spin_unlock(&fi->lock);
1303         return 0;
1304 }
1305
1306 #define CR_PENDING_SUBCLASS 28
1307 static int __inject_float_mchk(struct kvm *kvm,
1308                                 struct kvm_s390_interrupt_info *inti)
1309 {
1310         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1311
1312         spin_lock(&fi->lock);
1313         fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1314         fi->mchk.mcic |= inti->mchk.mcic;
1315         set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1316         spin_unlock(&fi->lock);
1317         kfree(inti);
1318         return 0;
1319 }
1320
1321 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1322 {
1323         struct kvm_s390_float_interrupt *fi;
1324         struct list_head *list;
1325         int isc;
1326
1327         fi = &kvm->arch.float_int;
1328         spin_lock(&fi->lock);
1329         if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1330                 spin_unlock(&fi->lock);
1331                 return -EBUSY;
1332         }
1333         fi->counters[FIRQ_CNTR_IO] += 1;
1334
1335         isc = int_word_to_isc(inti->io.io_int_word);
1336         list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1337         list_add_tail(&inti->list, list);
1338         set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1339         spin_unlock(&fi->lock);
1340         return 0;
1341 }
1342
1343 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1344 {
1345         struct kvm_s390_local_interrupt *li;
1346         struct kvm_s390_float_interrupt *fi;
1347         struct kvm_vcpu *dst_vcpu = NULL;
1348         int sigcpu;
1349         u64 type = READ_ONCE(inti->type);
1350         int rc;
1351
1352         fi = &kvm->arch.float_int;
1353
1354         switch (type) {
1355         case KVM_S390_MCHK:
1356                 rc = __inject_float_mchk(kvm, inti);
1357                 break;
1358         case KVM_S390_INT_VIRTIO:
1359                 rc = __inject_virtio(kvm, inti);
1360                 break;
1361         case KVM_S390_INT_SERVICE:
1362                 rc = __inject_service(kvm, inti);
1363                 break;
1364         case KVM_S390_INT_PFAULT_DONE:
1365                 rc = __inject_pfault_done(kvm, inti);
1366                 break;
1367         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1368                 rc = __inject_io(kvm, inti);
1369                 break;
1370         default:
1371                 rc = -EINVAL;
1372         }
1373         if (rc)
1374                 return rc;
1375
1376         sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
1377         if (sigcpu == KVM_MAX_VCPUS) {
1378                 do {
1379                         sigcpu = fi->next_rr_cpu++;
1380                         if (sigcpu == KVM_MAX_VCPUS)
1381                                 sigcpu = fi->next_rr_cpu = 0;
1382                 } while (kvm_get_vcpu(kvm, sigcpu) == NULL);
1383         }
1384         dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1385         li = &dst_vcpu->arch.local_int;
1386         spin_lock(&li->lock);
1387         switch (type) {
1388         case KVM_S390_MCHK:
1389                 atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
1390                 break;
1391         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1392                 atomic_set_mask(CPUSTAT_IO_INT, li->cpuflags);
1393                 break;
1394         default:
1395                 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1396                 break;
1397         }
1398         spin_unlock(&li->lock);
1399         kvm_s390_vcpu_wakeup(kvm_get_vcpu(kvm, sigcpu));
1400         return 0;
1401
1402 }
1403
1404 int kvm_s390_inject_vm(struct kvm *kvm,
1405                        struct kvm_s390_interrupt *s390int)
1406 {
1407         struct kvm_s390_interrupt_info *inti;
1408         int rc;
1409
1410         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1411         if (!inti)
1412                 return -ENOMEM;
1413
1414         inti->type = s390int->type;
1415         switch (inti->type) {
1416         case KVM_S390_INT_VIRTIO:
1417                 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1418                          s390int->parm, s390int->parm64);
1419                 inti->ext.ext_params = s390int->parm;
1420                 inti->ext.ext_params2 = s390int->parm64;
1421                 break;
1422         case KVM_S390_INT_SERVICE:
1423                 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
1424                 inti->ext.ext_params = s390int->parm;
1425                 break;
1426         case KVM_S390_INT_PFAULT_DONE:
1427                 inti->ext.ext_params2 = s390int->parm64;
1428                 break;
1429         case KVM_S390_MCHK:
1430                 VM_EVENT(kvm, 5, "inject: machine check parm64:%llx",
1431                          s390int->parm64);
1432                 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1433                 inti->mchk.mcic = s390int->parm64;
1434                 break;
1435         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1436                 if (inti->type & IOINT_AI_MASK)
1437                         VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
1438                 else
1439                         VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
1440                                  s390int->type & IOINT_CSSID_MASK,
1441                                  s390int->type & IOINT_SSID_MASK,
1442                                  s390int->type & IOINT_SCHID_MASK);
1443                 inti->io.subchannel_id = s390int->parm >> 16;
1444                 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1445                 inti->io.io_int_parm = s390int->parm64 >> 32;
1446                 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1447                 break;
1448         default:
1449                 kfree(inti);
1450                 return -EINVAL;
1451         }
1452         trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1453                                  2);
1454
1455         rc = __inject_vm(kvm, inti);
1456         if (rc)
1457                 kfree(inti);
1458         return rc;
1459 }
1460
1461 int kvm_s390_reinject_io_int(struct kvm *kvm,
1462                               struct kvm_s390_interrupt_info *inti)
1463 {
1464         return __inject_vm(kvm, inti);
1465 }
1466
1467 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1468                        struct kvm_s390_irq *irq)
1469 {
1470         irq->type = s390int->type;
1471         switch (irq->type) {
1472         case KVM_S390_PROGRAM_INT:
1473                 if (s390int->parm & 0xffff0000)
1474                         return -EINVAL;
1475                 irq->u.pgm.code = s390int->parm;
1476                 break;
1477         case KVM_S390_SIGP_SET_PREFIX:
1478                 irq->u.prefix.address = s390int->parm;
1479                 break;
1480         case KVM_S390_SIGP_STOP:
1481                 irq->u.stop.flags = s390int->parm;
1482                 break;
1483         case KVM_S390_INT_EXTERNAL_CALL:
1484                 if (s390int->parm & 0xffff0000)
1485                         return -EINVAL;
1486                 irq->u.extcall.code = s390int->parm;
1487                 break;
1488         case KVM_S390_INT_EMERGENCY:
1489                 if (s390int->parm & 0xffff0000)
1490                         return -EINVAL;
1491                 irq->u.emerg.code = s390int->parm;
1492                 break;
1493         case KVM_S390_MCHK:
1494                 irq->u.mchk.mcic = s390int->parm64;
1495                 break;
1496         }
1497         return 0;
1498 }
1499
1500 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1501 {
1502         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1503
1504         return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1505 }
1506
1507 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1508 {
1509         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1510
1511         spin_lock(&li->lock);
1512         li->irq.stop.flags = 0;
1513         clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1514         spin_unlock(&li->lock);
1515 }
1516
1517 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1518 {
1519         int rc;
1520
1521         switch (irq->type) {
1522         case KVM_S390_PROGRAM_INT:
1523                 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
1524                            irq->u.pgm.code);
1525                 rc = __inject_prog(vcpu, irq);
1526                 break;
1527         case KVM_S390_SIGP_SET_PREFIX:
1528                 rc = __inject_set_prefix(vcpu, irq);
1529                 break;
1530         case KVM_S390_SIGP_STOP:
1531                 rc = __inject_sigp_stop(vcpu, irq);
1532                 break;
1533         case KVM_S390_RESTART:
1534                 rc = __inject_sigp_restart(vcpu, irq);
1535                 break;
1536         case KVM_S390_INT_CLOCK_COMP:
1537                 rc = __inject_ckc(vcpu);
1538                 break;
1539         case KVM_S390_INT_CPU_TIMER:
1540                 rc = __inject_cpu_timer(vcpu);
1541                 break;
1542         case KVM_S390_INT_EXTERNAL_CALL:
1543                 rc = __inject_extcall(vcpu, irq);
1544                 break;
1545         case KVM_S390_INT_EMERGENCY:
1546                 rc = __inject_sigp_emergency(vcpu, irq);
1547                 break;
1548         case KVM_S390_MCHK:
1549                 rc = __inject_mchk(vcpu, irq);
1550                 break;
1551         case KVM_S390_INT_PFAULT_INIT:
1552                 rc = __inject_pfault_init(vcpu, irq);
1553                 break;
1554         case KVM_S390_INT_VIRTIO:
1555         case KVM_S390_INT_SERVICE:
1556         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1557         default:
1558                 rc = -EINVAL;
1559         }
1560
1561         return rc;
1562 }
1563
1564 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1565 {
1566         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1567         int rc;
1568
1569         spin_lock(&li->lock);
1570         rc = do_inject_vcpu(vcpu, irq);
1571         spin_unlock(&li->lock);
1572         if (!rc)
1573                 kvm_s390_vcpu_wakeup(vcpu);
1574         return rc;
1575 }
1576
1577 static inline void clear_irq_list(struct list_head *_list)
1578 {
1579         struct kvm_s390_interrupt_info *inti, *n;
1580
1581         list_for_each_entry_safe(inti, n, _list, list) {
1582                 list_del(&inti->list);
1583                 kfree(inti);
1584         }
1585 }
1586
1587 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1588                        struct kvm_s390_irq *irq)
1589 {
1590         irq->type = inti->type;
1591         switch (inti->type) {
1592         case KVM_S390_INT_PFAULT_INIT:
1593         case KVM_S390_INT_PFAULT_DONE:
1594         case KVM_S390_INT_VIRTIO:
1595                 irq->u.ext = inti->ext;
1596                 break;
1597         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1598                 irq->u.io = inti->io;
1599                 break;
1600         }
1601 }
1602
1603 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1604 {
1605         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1606         int i;
1607
1608         spin_lock(&fi->lock);
1609         fi->pending_irqs = 0;
1610         memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
1611         memset(&fi->mchk, 0, sizeof(fi->mchk));
1612         for (i = 0; i < FIRQ_LIST_COUNT; i++)
1613                 clear_irq_list(&fi->lists[i]);
1614         for (i = 0; i < FIRQ_MAX_COUNT; i++)
1615                 fi->counters[i] = 0;
1616         spin_unlock(&fi->lock);
1617 };
1618
1619 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1620 {
1621         struct kvm_s390_interrupt_info *inti;
1622         struct kvm_s390_float_interrupt *fi;
1623         struct kvm_s390_irq *buf;
1624         struct kvm_s390_irq *irq;
1625         int max_irqs;
1626         int ret = 0;
1627         int n = 0;
1628         int i;
1629
1630         if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
1631                 return -EINVAL;
1632
1633         /*
1634          * We are already using -ENOMEM to signal
1635          * userspace it may retry with a bigger buffer,
1636          * so we need to use something else for this case
1637          */
1638         buf = vzalloc(len);
1639         if (!buf)
1640                 return -ENOBUFS;
1641
1642         max_irqs = len / sizeof(struct kvm_s390_irq);
1643
1644         fi = &kvm->arch.float_int;
1645         spin_lock(&fi->lock);
1646         for (i = 0; i < FIRQ_LIST_COUNT; i++) {
1647                 list_for_each_entry(inti, &fi->lists[i], list) {
1648                         if (n == max_irqs) {
1649                                 /* signal userspace to try again */
1650                                 ret = -ENOMEM;
1651                                 goto out;
1652                         }
1653                         inti_to_irq(inti, &buf[n]);
1654                         n++;
1655                 }
1656         }
1657         if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
1658                 if (n == max_irqs) {
1659                         /* signal userspace to try again */
1660                         ret = -ENOMEM;
1661                         goto out;
1662                 }
1663                 irq = (struct kvm_s390_irq *) &buf[n];
1664                 irq->type = KVM_S390_INT_SERVICE;
1665                 irq->u.ext = fi->srv_signal;
1666                 n++;
1667         }
1668         if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
1669                 if (n == max_irqs) {
1670                                 /* signal userspace to try again */
1671                                 ret = -ENOMEM;
1672                                 goto out;
1673                 }
1674                 irq = (struct kvm_s390_irq *) &buf[n];
1675                 irq->type = KVM_S390_MCHK;
1676                 irq->u.mchk = fi->mchk;
1677                 n++;
1678 }
1679
1680 out:
1681         spin_unlock(&fi->lock);
1682         if (!ret && n > 0) {
1683                 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
1684                         ret = -EFAULT;
1685         }
1686         vfree(buf);
1687
1688         return ret < 0 ? ret : n;
1689 }
1690
1691 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1692 {
1693         int r;
1694
1695         switch (attr->group) {
1696         case KVM_DEV_FLIC_GET_ALL_IRQS:
1697                 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
1698                                           attr->attr);
1699                 break;
1700         default:
1701                 r = -EINVAL;
1702         }
1703
1704         return r;
1705 }
1706
1707 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1708                                      u64 addr)
1709 {
1710         struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1711         void *target = NULL;
1712         void __user *source;
1713         u64 size;
1714
1715         if (get_user(inti->type, (u64 __user *)addr))
1716                 return -EFAULT;
1717
1718         switch (inti->type) {
1719         case KVM_S390_INT_PFAULT_INIT:
1720         case KVM_S390_INT_PFAULT_DONE:
1721         case KVM_S390_INT_VIRTIO:
1722         case KVM_S390_INT_SERVICE:
1723                 target = (void *) &inti->ext;
1724                 source = &uptr->u.ext;
1725                 size = sizeof(inti->ext);
1726                 break;
1727         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1728                 target = (void *) &inti->io;
1729                 source = &uptr->u.io;
1730                 size = sizeof(inti->io);
1731                 break;
1732         case KVM_S390_MCHK:
1733                 target = (void *) &inti->mchk;
1734                 source = &uptr->u.mchk;
1735                 size = sizeof(inti->mchk);
1736                 break;
1737         default:
1738                 return -EINVAL;
1739         }
1740
1741         if (copy_from_user(target, source, size))
1742                 return -EFAULT;
1743
1744         return 0;
1745 }
1746
1747 static int enqueue_floating_irq(struct kvm_device *dev,
1748                                 struct kvm_device_attr *attr)
1749 {
1750         struct kvm_s390_interrupt_info *inti = NULL;
1751         int r = 0;
1752         int len = attr->attr;
1753
1754         if (len % sizeof(struct kvm_s390_irq) != 0)
1755                 return -EINVAL;
1756         else if (len > KVM_S390_FLIC_MAX_BUFFER)
1757                 return -EINVAL;
1758
1759         while (len >= sizeof(struct kvm_s390_irq)) {
1760                 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1761                 if (!inti)
1762                         return -ENOMEM;
1763
1764                 r = copy_irq_from_user(inti, attr->addr);
1765                 if (r) {
1766                         kfree(inti);
1767                         return r;
1768                 }
1769                 r = __inject_vm(dev->kvm, inti);
1770                 if (r) {
1771                         kfree(inti);
1772                         return r;
1773                 }
1774                 len -= sizeof(struct kvm_s390_irq);
1775                 attr->addr += sizeof(struct kvm_s390_irq);
1776         }
1777
1778         return r;
1779 }
1780
1781 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1782 {
1783         if (id >= MAX_S390_IO_ADAPTERS)
1784                 return NULL;
1785         return kvm->arch.adapters[id];
1786 }
1787
1788 static int register_io_adapter(struct kvm_device *dev,
1789                                struct kvm_device_attr *attr)
1790 {
1791         struct s390_io_adapter *adapter;
1792         struct kvm_s390_io_adapter adapter_info;
1793
1794         if (copy_from_user(&adapter_info,
1795                            (void __user *)attr->addr, sizeof(adapter_info)))
1796                 return -EFAULT;
1797
1798         if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1799             (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1800                 return -EINVAL;
1801
1802         adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1803         if (!adapter)
1804                 return -ENOMEM;
1805
1806         INIT_LIST_HEAD(&adapter->maps);
1807         init_rwsem(&adapter->maps_lock);
1808         atomic_set(&adapter->nr_maps, 0);
1809         adapter->id = adapter_info.id;
1810         adapter->isc = adapter_info.isc;
1811         adapter->maskable = adapter_info.maskable;
1812         adapter->masked = false;
1813         adapter->swap = adapter_info.swap;
1814         dev->kvm->arch.adapters[adapter->id] = adapter;
1815
1816         return 0;
1817 }
1818
1819 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1820 {
1821         int ret;
1822         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1823
1824         if (!adapter || !adapter->maskable)
1825                 return -EINVAL;
1826         ret = adapter->masked;
1827         adapter->masked = masked;
1828         return ret;
1829 }
1830
1831 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1832 {
1833         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1834         struct s390_map_info *map;
1835         int ret;
1836
1837         if (!adapter || !addr)
1838                 return -EINVAL;
1839
1840         map = kzalloc(sizeof(*map), GFP_KERNEL);
1841         if (!map) {
1842                 ret = -ENOMEM;
1843                 goto out;
1844         }
1845         INIT_LIST_HEAD(&map->list);
1846         map->guest_addr = addr;
1847         map->addr = gmap_translate(kvm->arch.gmap, addr);
1848         if (map->addr == -EFAULT) {
1849                 ret = -EFAULT;
1850                 goto out;
1851         }
1852         ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1853         if (ret < 0)
1854                 goto out;
1855         BUG_ON(ret != 1);
1856         down_write(&adapter->maps_lock);
1857         if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1858                 list_add_tail(&map->list, &adapter->maps);
1859                 ret = 0;
1860         } else {
1861                 put_page(map->page);
1862                 ret = -EINVAL;
1863         }
1864         up_write(&adapter->maps_lock);
1865 out:
1866         if (ret)
1867                 kfree(map);
1868         return ret;
1869 }
1870
1871 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1872 {
1873         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1874         struct s390_map_info *map, *tmp;
1875         int found = 0;
1876
1877         if (!adapter || !addr)
1878                 return -EINVAL;
1879
1880         down_write(&adapter->maps_lock);
1881         list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1882                 if (map->guest_addr == addr) {
1883                         found = 1;
1884                         atomic_dec(&adapter->nr_maps);
1885                         list_del(&map->list);
1886                         put_page(map->page);
1887                         kfree(map);
1888                         break;
1889                 }
1890         }
1891         up_write(&adapter->maps_lock);
1892
1893         return found ? 0 : -EINVAL;
1894 }
1895
1896 void kvm_s390_destroy_adapters(struct kvm *kvm)
1897 {
1898         int i;
1899         struct s390_map_info *map, *tmp;
1900
1901         for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
1902                 if (!kvm->arch.adapters[i])
1903                         continue;
1904                 list_for_each_entry_safe(map, tmp,
1905                                          &kvm->arch.adapters[i]->maps, list) {
1906                         list_del(&map->list);
1907                         put_page(map->page);
1908                         kfree(map);
1909                 }
1910                 kfree(kvm->arch.adapters[i]);
1911         }
1912 }
1913
1914 static int modify_io_adapter(struct kvm_device *dev,
1915                              struct kvm_device_attr *attr)
1916 {
1917         struct kvm_s390_io_adapter_req req;
1918         struct s390_io_adapter *adapter;
1919         int ret;
1920
1921         if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
1922                 return -EFAULT;
1923
1924         adapter = get_io_adapter(dev->kvm, req.id);
1925         if (!adapter)
1926                 return -EINVAL;
1927         switch (req.type) {
1928         case KVM_S390_IO_ADAPTER_MASK:
1929                 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
1930                 if (ret > 0)
1931                         ret = 0;
1932                 break;
1933         case KVM_S390_IO_ADAPTER_MAP:
1934                 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
1935                 break;
1936         case KVM_S390_IO_ADAPTER_UNMAP:
1937                 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
1938                 break;
1939         default:
1940                 ret = -EINVAL;
1941         }
1942
1943         return ret;
1944 }
1945
1946 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1947 {
1948         int r = 0;
1949         unsigned int i;
1950         struct kvm_vcpu *vcpu;
1951
1952         switch (attr->group) {
1953         case KVM_DEV_FLIC_ENQUEUE:
1954                 r = enqueue_floating_irq(dev, attr);
1955                 break;
1956         case KVM_DEV_FLIC_CLEAR_IRQS:
1957                 kvm_s390_clear_float_irqs(dev->kvm);
1958                 break;
1959         case KVM_DEV_FLIC_APF_ENABLE:
1960                 dev->kvm->arch.gmap->pfault_enabled = 1;
1961                 break;
1962         case KVM_DEV_FLIC_APF_DISABLE_WAIT:
1963                 dev->kvm->arch.gmap->pfault_enabled = 0;
1964                 /*
1965                  * Make sure no async faults are in transition when
1966                  * clearing the queues. So we don't need to worry
1967                  * about late coming workers.
1968                  */
1969                 synchronize_srcu(&dev->kvm->srcu);
1970                 kvm_for_each_vcpu(i, vcpu, dev->kvm)
1971                         kvm_clear_async_pf_completion_queue(vcpu);
1972                 break;
1973         case KVM_DEV_FLIC_ADAPTER_REGISTER:
1974                 r = register_io_adapter(dev, attr);
1975                 break;
1976         case KVM_DEV_FLIC_ADAPTER_MODIFY:
1977                 r = modify_io_adapter(dev, attr);
1978                 break;
1979         default:
1980                 r = -EINVAL;
1981         }
1982
1983         return r;
1984 }
1985
1986 static int flic_create(struct kvm_device *dev, u32 type)
1987 {
1988         if (!dev)
1989                 return -EINVAL;
1990         if (dev->kvm->arch.flic)
1991                 return -EINVAL;
1992         dev->kvm->arch.flic = dev;
1993         return 0;
1994 }
1995
1996 static void flic_destroy(struct kvm_device *dev)
1997 {
1998         dev->kvm->arch.flic = NULL;
1999         kfree(dev);
2000 }
2001
2002 /* s390 floating irq controller (flic) */
2003 struct kvm_device_ops kvm_flic_ops = {
2004         .name = "kvm-flic",
2005         .get_attr = flic_get_attr,
2006         .set_attr = flic_set_attr,
2007         .create = flic_create,
2008         .destroy = flic_destroy,
2009 };
2010
2011 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2012 {
2013         unsigned long bit;
2014
2015         bit = bit_nr + (addr % PAGE_SIZE) * 8;
2016
2017         return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2018 }
2019
2020 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2021                                           u64 addr)
2022 {
2023         struct s390_map_info *map;
2024
2025         if (!adapter)
2026                 return NULL;
2027
2028         list_for_each_entry(map, &adapter->maps, list) {
2029                 if (map->guest_addr == addr)
2030                         return map;
2031         }
2032         return NULL;
2033 }
2034
2035 static int adapter_indicators_set(struct kvm *kvm,
2036                                   struct s390_io_adapter *adapter,
2037                                   struct kvm_s390_adapter_int *adapter_int)
2038 {
2039         unsigned long bit;
2040         int summary_set, idx;
2041         struct s390_map_info *info;
2042         void *map;
2043
2044         info = get_map_info(adapter, adapter_int->ind_addr);
2045         if (!info)
2046                 return -1;
2047         map = page_address(info->page);
2048         bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2049         set_bit(bit, map);
2050         idx = srcu_read_lock(&kvm->srcu);
2051         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2052         set_page_dirty_lock(info->page);
2053         info = get_map_info(adapter, adapter_int->summary_addr);
2054         if (!info) {
2055                 srcu_read_unlock(&kvm->srcu, idx);
2056                 return -1;
2057         }
2058         map = page_address(info->page);
2059         bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2060                           adapter->swap);
2061         summary_set = test_and_set_bit(bit, map);
2062         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2063         set_page_dirty_lock(info->page);
2064         srcu_read_unlock(&kvm->srcu, idx);
2065         return summary_set ? 0 : 1;
2066 }
2067
2068 /*
2069  * < 0 - not injected due to error
2070  * = 0 - coalesced, summary indicator already active
2071  * > 0 - injected interrupt
2072  */
2073 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2074                            struct kvm *kvm, int irq_source_id, int level,
2075                            bool line_status)
2076 {
2077         int ret;
2078         struct s390_io_adapter *adapter;
2079
2080         /* We're only interested in the 0->1 transition. */
2081         if (!level)
2082                 return 0;
2083         adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2084         if (!adapter)
2085                 return -1;
2086         down_read(&adapter->maps_lock);
2087         ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2088         up_read(&adapter->maps_lock);
2089         if ((ret > 0) && !adapter->masked) {
2090                 struct kvm_s390_interrupt s390int = {
2091                         .type = KVM_S390_INT_IO(1, 0, 0, 0),
2092                         .parm = 0,
2093                         .parm64 = (adapter->isc << 27) | 0x80000000,
2094                 };
2095                 ret = kvm_s390_inject_vm(kvm, &s390int);
2096                 if (ret == 0)
2097                         ret = 1;
2098         }
2099         return ret;
2100 }
2101
2102 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
2103                           const struct kvm_irq_routing_entry *ue)
2104 {
2105         int ret;
2106
2107         switch (ue->type) {
2108         case KVM_IRQ_ROUTING_S390_ADAPTER:
2109                 e->set = set_adapter_int;
2110                 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2111                 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2112                 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2113                 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2114                 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2115                 ret = 0;
2116                 break;
2117         default:
2118                 ret = -EINVAL;
2119         }
2120
2121         return ret;
2122 }
2123
2124 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2125                 int irq_source_id, int level, bool line_status)
2126 {
2127         return -EINVAL;
2128 }
2129
2130 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2131 {
2132         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2133         struct kvm_s390_irq *buf;
2134         int r = 0;
2135         int n;
2136
2137         buf = vmalloc(len);
2138         if (!buf)
2139                 return -ENOMEM;
2140
2141         if (copy_from_user((void *) buf, irqstate, len)) {
2142                 r = -EFAULT;
2143                 goto out_free;
2144         }
2145
2146         /*
2147          * Don't allow setting the interrupt state
2148          * when there are already interrupts pending
2149          */
2150         spin_lock(&li->lock);
2151         if (li->pending_irqs) {
2152                 r = -EBUSY;
2153                 goto out_unlock;
2154         }
2155
2156         for (n = 0; n < len / sizeof(*buf); n++) {
2157                 r = do_inject_vcpu(vcpu, &buf[n]);
2158                 if (r)
2159                         break;
2160         }
2161
2162 out_unlock:
2163         spin_unlock(&li->lock);
2164 out_free:
2165         vfree(buf);
2166
2167         return r;
2168 }
2169
2170 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2171                             struct kvm_s390_irq *irq,
2172                             unsigned long irq_type)
2173 {
2174         switch (irq_type) {
2175         case IRQ_PEND_MCHK_EX:
2176         case IRQ_PEND_MCHK_REP:
2177                 irq->type = KVM_S390_MCHK;
2178                 irq->u.mchk = li->irq.mchk;
2179                 break;
2180         case IRQ_PEND_PROG:
2181                 irq->type = KVM_S390_PROGRAM_INT;
2182                 irq->u.pgm = li->irq.pgm;
2183                 break;
2184         case IRQ_PEND_PFAULT_INIT:
2185                 irq->type = KVM_S390_INT_PFAULT_INIT;
2186                 irq->u.ext = li->irq.ext;
2187                 break;
2188         case IRQ_PEND_EXT_EXTERNAL:
2189                 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2190                 irq->u.extcall = li->irq.extcall;
2191                 break;
2192         case IRQ_PEND_EXT_CLOCK_COMP:
2193                 irq->type = KVM_S390_INT_CLOCK_COMP;
2194                 break;
2195         case IRQ_PEND_EXT_CPU_TIMER:
2196                 irq->type = KVM_S390_INT_CPU_TIMER;
2197                 break;
2198         case IRQ_PEND_SIGP_STOP:
2199                 irq->type = KVM_S390_SIGP_STOP;
2200                 irq->u.stop = li->irq.stop;
2201                 break;
2202         case IRQ_PEND_RESTART:
2203                 irq->type = KVM_S390_RESTART;
2204                 break;
2205         case IRQ_PEND_SET_PREFIX:
2206                 irq->type = KVM_S390_SIGP_SET_PREFIX;
2207                 irq->u.prefix = li->irq.prefix;
2208                 break;
2209         }
2210 }
2211
2212 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2213 {
2214         uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
2215         unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2216         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2217         unsigned long pending_irqs;
2218         struct kvm_s390_irq irq;
2219         unsigned long irq_type;
2220         int cpuaddr;
2221         int n = 0;
2222
2223         spin_lock(&li->lock);
2224         pending_irqs = li->pending_irqs;
2225         memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2226                sizeof(sigp_emerg_pending));
2227         spin_unlock(&li->lock);
2228
2229         for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2230                 memset(&irq, 0, sizeof(irq));
2231                 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2232                         continue;
2233                 if (n + sizeof(irq) > len)
2234                         return -ENOBUFS;
2235                 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2236                 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2237                         return -EFAULT;
2238                 n += sizeof(irq);
2239         }
2240
2241         if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2242                 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2243                         memset(&irq, 0, sizeof(irq));
2244                         if (n + sizeof(irq) > len)
2245                                 return -ENOBUFS;
2246                         irq.type = KVM_S390_INT_EMERGENCY;
2247                         irq.u.emerg.code = cpuaddr;
2248                         if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2249                                 return -EFAULT;
2250                         n += sizeof(irq);
2251                 }
2252         }
2253
2254         if ((sigp_ctrl & SIGP_CTRL_C) &&
2255             (atomic_read(&vcpu->arch.sie_block->cpuflags) &
2256              CPUSTAT_ECALL_PEND)) {
2257                 if (n + sizeof(irq) > len)
2258                         return -ENOBUFS;
2259                 memset(&irq, 0, sizeof(irq));
2260                 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2261                 irq.u.extcall.code = sigp_ctrl & SIGP_CTRL_SCN_MASK;
2262                 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2263                         return -EFAULT;
2264                 n += sizeof(irq);
2265         }
2266
2267         return n;
2268 }