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 PFAULT_INIT 0x0600
  34 #define PFAULT_DONE 0x0680
  35 #define VIRTIO_PARAM 0x0d00
  36
  37 int psw_extint_disabled(struct kvm_vcpu *vcpu)
  38 {
  39         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
  40 }
  41
  42 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
  43 {
  44         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
  45 }
  46
  47 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
  48 {
  49         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
  50 }
  51
  52 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
  53 {
  54         if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
  55             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
  56             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
  57                 return 0;
  58         return 1;
  59 }
  60
  61 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
  62 {
  63         if (psw_extint_disabled(vcpu) ||
  64             !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
  65                 return 0;
  66         if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
  67                 /* No timer interrupts when single stepping */
  68                 return 0;
  69         return 1;
  70 }
  71
  72 static int ckc_irq_pending(struct kvm_vcpu *vcpu)
  73 {
  74         if (!(vcpu->arch.sie_block->ckc <
  75               get_tod_clock_fast() + vcpu->arch.sie_block->epoch))
  76                 return 0;
  77         return ckc_interrupts_enabled(vcpu);
  78 }
  79
  80 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
  81 {
  82         return !psw_extint_disabled(vcpu) &&
  83                (vcpu->arch.sie_block->gcr[0] & 0x400ul);
  84 }
  85
  86 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
  87 {
  88         return (vcpu->arch.sie_block->cputm >> 63) &&
  89                cpu_timer_interrupts_enabled(vcpu);
  90 }
  91
  92 static inline int is_ioirq(unsigned long irq_type)
  93 {
  94         return ((irq_type >= IRQ_PEND_IO_ISC_0) &&
  95                 (irq_type <= IRQ_PEND_IO_ISC_7));
  96 }
  97
  98 static uint64_t isc_to_isc_bits(int isc)
  99 {
 100         return (0x80 >> isc) << 24;
 101 }
 102
 103 static inline u8 int_word_to_isc(u32 int_word)
 104 {
 105         return (int_word & 0x38000000) >> 27;
 106 }
 107
 108 static inline unsigned long pending_floating_irqs(struct kvm_vcpu *vcpu)
 109 {
 110         return vcpu->kvm->arch.float_int.pending_irqs;
 111 }
 112
 113 static inline unsigned long pending_local_irqs(struct kvm_vcpu *vcpu)
 114 {
 115         return vcpu->arch.local_int.pending_irqs;
 116 }
 117
 118 static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
 119                                    unsigned long active_mask)
 120 {
 121         int i;
 122
 123         for (i = 0; i <= MAX_ISC; i++)
 124                 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
 125                         active_mask &= ~(1UL << (IRQ_PEND_IO_ISC_0 + i));
 126
 127         return active_mask;
 128 }
 129
 130 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
 131 {
 132         unsigned long active_mask;
 133
 134         active_mask = pending_local_irqs(vcpu);
 135         active_mask |= pending_floating_irqs(vcpu);
 136         if (!active_mask)
 137                 return 0;
 138
 139         if (psw_extint_disabled(vcpu))
 140                 active_mask &= ~IRQ_PEND_EXT_MASK;
 141         if (psw_ioint_disabled(vcpu))
 142                 active_mask &= ~IRQ_PEND_IO_MASK;
 143         else
 144                 active_mask = disable_iscs(vcpu, active_mask);
 145         if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
 146                 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
 147         if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
 148                 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
 149         if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
 150                 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
 151         if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
 152                 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
 153         if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
 154                 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
 155         if (psw_mchk_disabled(vcpu))
 156                 active_mask &= ~IRQ_PEND_MCHK_MASK;
 157         if (!(vcpu->arch.sie_block->gcr[14] &
 158               vcpu->kvm->arch.float_int.mchk.cr14))
 159                 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
 160
 161         /*
 162          * STOP irqs will never be actively delivered. They are triggered via
 163          * intercept requests and cleared when the stop intercept is performed.
 164          */
 165         __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
 166
 167         return active_mask;
 168 }
 169
 170 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
 171 {
 172         atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 173         set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 174 }
 175
 176 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
 177 {
 178         atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 179         clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 180 }
 181
 182 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
 183 {
 184         atomic_clear_mask(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
 185                           &vcpu->arch.sie_block->cpuflags);
 186         vcpu->arch.sie_block->lctl = 0x0000;
 187         vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
 188
 189         if (guestdbg_enabled(vcpu)) {
 190                 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
 191                                                LCTL_CR10 | LCTL_CR11);
 192                 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
 193         }
 194 }
 195
 196 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
 197 {
 198         atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
 199 }
 200
 201 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
 202 {
 203         if (!(pending_floating_irqs(vcpu) & IRQ_PEND_IO_MASK))
 204                 return;
 205         else if (psw_ioint_disabled(vcpu))
 206                 __set_cpuflag(vcpu, CPUSTAT_IO_INT);
 207         else
 208                 vcpu->arch.sie_block->lctl |= LCTL_CR6;
 209 }
 210
 211 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
 212 {
 213         if (!(pending_local_irqs(vcpu) & IRQ_PEND_EXT_MASK))
 214                 return;
 215         if (psw_extint_disabled(vcpu))
 216                 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
 217         else
 218                 vcpu->arch.sie_block->lctl |= LCTL_CR0;
 219 }
 220
 221 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
 222 {
 223         if (!(pending_local_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
 224                 return;
 225         if (psw_mchk_disabled(vcpu))
 226                 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
 227         else
 228                 vcpu->arch.sie_block->lctl |= LCTL_CR14;
 229 }
 230
 231 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
 232 {
 233         if (kvm_s390_is_stop_irq_pending(vcpu))
 234                 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
 235 }
 236
 237 /* Set interception request for non-deliverable interrupts */
 238 static void set_intercept_indicators(struct kvm_vcpu *vcpu)
 239 {
 240         set_intercept_indicators_io(vcpu);
 241         set_intercept_indicators_ext(vcpu);
 242         set_intercept_indicators_mchk(vcpu);
 243         set_intercept_indicators_stop(vcpu);
 244 }
 245
 246 static u16 get_ilc(struct kvm_vcpu *vcpu)
 247 {
 248         switch (vcpu->arch.sie_block->icptcode) {
 249         case ICPT_INST:
 250         case ICPT_INSTPROGI:
 251         case ICPT_OPEREXC:
 252         case ICPT_PARTEXEC:
 253         case ICPT_IOINST:
 254                 /* last instruction only stored for these icptcodes */
 255                 return insn_length(vcpu->arch.sie_block->ipa >> 8);
 256         case ICPT_PROGI:
 257                 return vcpu->arch.sie_block->pgmilc;
 258         default:
 259                 return 0;
 260         }
 261 }
 262
 263 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
 264 {
 265         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 266         int rc;
 267
 268         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
 269                                          0, 0);
 270
 271         rc  = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
 272                            (u16 *)__LC_EXT_INT_CODE);
 273         rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 274         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 275                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 276         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 277                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 278         clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
 279         return rc ? -EFAULT : 0;
 280 }
 281
 282 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
 283 {
 284         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 285         int rc;
 286
 287         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
 288                                          0, 0);
 289
 290         rc  = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
 291                            (u16 __user *)__LC_EXT_INT_CODE);
 292         rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 293         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 294                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 295         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 296                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 297         clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
 298         return rc ? -EFAULT : 0;
 299 }
 300
 301 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
 302 {
 303         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 304         struct kvm_s390_ext_info ext;
 305         int rc;
 306
 307         spin_lock(&li->lock);
 308         ext = li->irq.ext;
 309         clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
 310         li->irq.ext.ext_params2 = 0;
 311         spin_unlock(&li->lock);
 312
 313         VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
 314                    ext.ext_params2);
 315         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 316                                          KVM_S390_INT_PFAULT_INIT,
 317                                          0, ext.ext_params2);
 318
 319         rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
 320         rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
 321         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 322                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 323         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 324                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 325         rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
 326         return rc ? -EFAULT : 0;
 327 }
 328
 329 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
 330 {
 331         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 332         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 333         struct kvm_s390_mchk_info mchk = {};
 334         unsigned long adtl_status_addr;
 335         int deliver = 0;
 336         int rc = 0;
 337
 338         spin_lock(&fi->lock);
 339         spin_lock(&li->lock);
 340         if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
 341             test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
 342                 /*
 343                  * If there was an exigent machine check pending, then any
 344                  * repressible machine checks that might have been pending
 345                  * are indicated along with it, so always clear bits for
 346                  * repressible and exigent interrupts
 347                  */
 348                 mchk = li->irq.mchk;
 349                 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
 350                 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
 351                 memset(&li->irq.mchk, 0, sizeof(mchk));
 352                 deliver = 1;
 353         }
 354         /*
 355          * We indicate floating repressible conditions along with
 356          * other pending conditions. Channel Report Pending and Channel
 357          * Subsystem damage are the only two and and are indicated by
 358          * bits in mcic and masked in cr14.
 359          */
 360         if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
 361                 mchk.mcic |= fi->mchk.mcic;
 362                 mchk.cr14 |= fi->mchk.cr14;
 363                 memset(&fi->mchk, 0, sizeof(mchk));
 364                 deliver = 1;
 365         }
 366         spin_unlock(&li->lock);
 367         spin_unlock(&fi->lock);
 368
 369         if (deliver) {
 370                 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
 371                            mchk.mcic);
 372                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 373                                                  KVM_S390_MCHK,
 374                                                  mchk.cr14, mchk.mcic);
 375
 376                 rc  = kvm_s390_vcpu_store_status(vcpu,
 377                                                  KVM_S390_STORE_STATUS_PREFIXED);
 378                 rc |= read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR,
 379                                     &adtl_status_addr,
 380                                     sizeof(unsigned long));
 381                 rc |= kvm_s390_vcpu_store_adtl_status(vcpu,
 382                                                       adtl_status_addr);
 383                 rc |= put_guest_lc(vcpu, mchk.mcic,
 384                                    (u64 __user *) __LC_MCCK_CODE);
 385                 rc |= put_guest_lc(vcpu, mchk.failing_storage_address,
 386                                    (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
 387                 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA,
 388                                      &mchk.fixed_logout,
 389                                      sizeof(mchk.fixed_logout));
 390                 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
 391                                      &vcpu->arch.sie_block->gpsw,
 392                                      sizeof(psw_t));
 393                 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
 394                                     &vcpu->arch.sie_block->gpsw,
 395                                     sizeof(psw_t));
 396         }
 397         return rc ? -EFAULT : 0;
 398 }
 399
 400 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
 401 {
 402         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 403         int rc;
 404
 405         VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
 406         vcpu->stat.deliver_restart_signal++;
 407         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
 408
 409         rc  = write_guest_lc(vcpu,
 410                              offsetof(struct _lowcore, restart_old_psw),
 411                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 412         rc |= read_guest_lc(vcpu, offsetof(struct _lowcore, restart_psw),
 413                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 414         clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
 415         return rc ? -EFAULT : 0;
 416 }
 417
 418 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
 419 {
 420         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 421         struct kvm_s390_prefix_info prefix;
 422
 423         spin_lock(&li->lock);
 424         prefix = li->irq.prefix;
 425         li->irq.prefix.address = 0;
 426         clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
 427         spin_unlock(&li->lock);
 428
 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", "deliver: 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", "deliver: 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, 3, "deliver: program irq code 0x%x, ilc:%d",
 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, "deliver: sclp parameter 0x%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                 list_del(&inti->list);
 653                 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
 654         }
 655         if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
 656                 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
 657         spin_unlock(&fi->lock);
 658
 659         if (inti) {
 660                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 661                                                  KVM_S390_INT_PFAULT_DONE, 0,
 662                                                  inti->ext.ext_params2);
 663                 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
 664                            inti->ext.ext_params2);
 665
 666                 rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
 667                                 (u16 *)__LC_EXT_INT_CODE);
 668                 rc |= put_guest_lc(vcpu, PFAULT_DONE,
 669                                 (u16 *)__LC_EXT_CPU_ADDR);
 670                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 671                                 &vcpu->arch.sie_block->gpsw,
 672                                 sizeof(psw_t));
 673                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 674                                 &vcpu->arch.sie_block->gpsw,
 675                                 sizeof(psw_t));
 676                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 677                                 (u64 *)__LC_EXT_PARAMS2);
 678                 kfree(inti);
 679         }
 680         return rc ? -EFAULT : 0;
 681 }
 682
 683 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
 684 {
 685         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 686         struct kvm_s390_interrupt_info *inti;
 687         int rc = 0;
 688
 689         spin_lock(&fi->lock);
 690         inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
 691                                         struct kvm_s390_interrupt_info,
 692                                         list);
 693         if (inti) {
 694                 VCPU_EVENT(vcpu, 4,
 695                            "deliver: virtio parm: 0x%x,parm64: 0x%llx",
 696                            inti->ext.ext_params, inti->ext.ext_params2);
 697                 vcpu->stat.deliver_virtio_interrupt++;
 698                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 699                                 inti->type,
 700                                 inti->ext.ext_params,
 701                                 inti->ext.ext_params2);
 702                 list_del(&inti->list);
 703                 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
 704         }
 705         if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
 706                 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
 707         spin_unlock(&fi->lock);
 708
 709         if (inti) {
 710                 rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
 711                                 (u16 *)__LC_EXT_INT_CODE);
 712                 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
 713                                 (u16 *)__LC_EXT_CPU_ADDR);
 714                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 715                                 &vcpu->arch.sie_block->gpsw,
 716                                 sizeof(psw_t));
 717                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 718                                 &vcpu->arch.sie_block->gpsw,
 719                                 sizeof(psw_t));
 720                 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
 721                                 (u32 *)__LC_EXT_PARAMS);
 722                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 723                                 (u64 *)__LC_EXT_PARAMS2);
 724                 kfree(inti);
 725         }
 726         return rc ? -EFAULT : 0;
 727 }
 728
 729 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
 730                                      unsigned long irq_type)
 731 {
 732         struct list_head *isc_list;
 733         struct kvm_s390_float_interrupt *fi;
 734         struct kvm_s390_interrupt_info *inti = NULL;
 735         int rc = 0;
 736
 737         fi = &vcpu->kvm->arch.float_int;
 738
 739         spin_lock(&fi->lock);
 740         isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0];
 741         inti = list_first_entry_or_null(isc_list,
 742                                         struct kvm_s390_interrupt_info,
 743                                         list);
 744         if (inti) {
 745                 VCPU_EVENT(vcpu, 4, "deliver: I/O 0x%llx", inti->type);
 746                 vcpu->stat.deliver_io_int++;
 747                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 748                                 inti->type,
 749                                 ((__u32)inti->io.subchannel_id << 16) |
 750                                 inti->io.subchannel_nr,
 751                                 ((__u64)inti->io.io_int_parm << 32) |
 752                                 inti->io.io_int_word);
 753                 list_del(&inti->list);
 754                 fi->counters[FIRQ_CNTR_IO] -= 1;
 755         }
 756         if (list_empty(isc_list))
 757                 clear_bit(irq_type, &fi->pending_irqs);
 758         spin_unlock(&fi->lock);
 759
 760         if (inti) {
 761                 rc  = put_guest_lc(vcpu, inti->io.subchannel_id,
 762                                 (u16 *)__LC_SUBCHANNEL_ID);
 763                 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
 764                                 (u16 *)__LC_SUBCHANNEL_NR);
 765                 rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
 766                                 (u32 *)__LC_IO_INT_PARM);
 767                 rc |= put_guest_lc(vcpu, inti->io.io_int_word,
 768                                 (u32 *)__LC_IO_INT_WORD);
 769                 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
 770                                 &vcpu->arch.sie_block->gpsw,
 771                                 sizeof(psw_t));
 772                 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
 773                                 &vcpu->arch.sie_block->gpsw,
 774                                 sizeof(psw_t));
 775                 kfree(inti);
 776         }
 777
 778         return rc ? -EFAULT : 0;
 779 }
 780
 781 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);
 782
 783 static const deliver_irq_t deliver_irq_funcs[] = {
 784         [IRQ_PEND_MCHK_EX]        = __deliver_machine_check,
 785         [IRQ_PEND_MCHK_REP]       = __deliver_machine_check,
 786         [IRQ_PEND_PROG]           = __deliver_prog,
 787         [IRQ_PEND_EXT_EMERGENCY]  = __deliver_emergency_signal,
 788         [IRQ_PEND_EXT_EXTERNAL]   = __deliver_external_call,
 789         [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc,
 790         [IRQ_PEND_EXT_CPU_TIMER]  = __deliver_cpu_timer,
 791         [IRQ_PEND_RESTART]        = __deliver_restart,
 792         [IRQ_PEND_SET_PREFIX]     = __deliver_set_prefix,
 793         [IRQ_PEND_PFAULT_INIT]    = __deliver_pfault_init,
 794         [IRQ_PEND_EXT_SERVICE]    = __deliver_service,
 795         [IRQ_PEND_PFAULT_DONE]    = __deliver_pfault_done,
 796         [IRQ_PEND_VIRTIO]         = __deliver_virtio,
 797 };
 798
 799 /* Check whether an external call is pending (deliverable or not) */
 800 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
 801 {
 802         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 803         uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
 804
 805         if (!sclp.has_sigpif)
 806                 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
 807
 808         return (sigp_ctrl & SIGP_CTRL_C) &&
 809                (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND);
 810 }
 811
 812 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
 813 {
 814         int rc;
 815
 816         rc = !!deliverable_irqs(vcpu);
 817
 818         if (!rc && kvm_cpu_has_pending_timer(vcpu))
 819                 rc = 1;
 820
 821         /* external call pending and deliverable */
 822         if (!rc && kvm_s390_ext_call_pending(vcpu) &&
 823             !psw_extint_disabled(vcpu) &&
 824             (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
 825                 rc = 1;
 826
 827         if (!rc && !exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
 828                 rc = 1;
 829
 830         return rc;
 831 }
 832
 833 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 834 {
 835         return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
 836 }
 837
 838 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
 839 {
 840         u64 now, sltime;
 841
 842         vcpu->stat.exit_wait_state++;
 843
 844         /* fast path */
 845         if (kvm_cpu_has_pending_timer(vcpu) || kvm_arch_vcpu_runnable(vcpu))
 846                 return 0;
 847
 848         if (psw_interrupts_disabled(vcpu)) {
 849                 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
 850                 return -EOPNOTSUPP; /* disabled wait */
 851         }
 852
 853         if (!ckc_interrupts_enabled(vcpu)) {
 854                 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
 855                 __set_cpu_idle(vcpu);
 856                 goto no_timer;
 857         }
 858
 859         now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
 860         sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
 861
 862         /* underflow */
 863         if (vcpu->arch.sie_block->ckc < now)
 864                 return 0;
 865
 866         __set_cpu_idle(vcpu);
 867         hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
 868         VCPU_EVENT(vcpu, 4, "enabled wait via clock comparator: %llu ns", sltime);
 869 no_timer:
 870         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
 871         kvm_vcpu_block(vcpu);
 872         __unset_cpu_idle(vcpu);
 873         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
 874
 875         hrtimer_cancel(&vcpu->arch.ckc_timer);
 876         return 0;
 877 }
 878
 879 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
 880 {
 881         if (waitqueue_active(&vcpu->wq)) {
 882                 /*
 883                  * The vcpu gave up the cpu voluntarily, mark it as a good
 884                  * yield-candidate.
 885                  */
 886                 vcpu->preempted = true;
 887                 wake_up_interruptible(&vcpu->wq);
 888                 vcpu->stat.halt_wakeup++;
 889         }
 890 }
 891
 892 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
 893 {
 894         struct kvm_vcpu *vcpu;
 895         u64 now, sltime;
 896
 897         vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
 898         now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
 899         sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
 900
 901         /*
 902          * If the monotonic clock runs faster than the tod clock we might be
 903          * woken up too early and have to go back to sleep to avoid deadlocks.
 904          */
 905         if (vcpu->arch.sie_block->ckc > now &&
 906             hrtimer_forward_now(timer, ns_to_ktime(sltime)))
 907                 return HRTIMER_RESTART;
 908         kvm_s390_vcpu_wakeup(vcpu);
 909         return HRTIMER_NORESTART;
 910 }
 911
 912 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
 913 {
 914         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 915
 916         spin_lock(&li->lock);
 917         li->pending_irqs = 0;
 918         bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
 919         memset(&li->irq, 0, sizeof(li->irq));
 920         spin_unlock(&li->lock);
 921
 922         /* clear pending external calls set by sigp interpretation facility */
 923         atomic_clear_mask(CPUSTAT_ECALL_PEND, li->cpuflags);
 924         vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl = 0;
 925 }
 926
 927 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
 928 {
 929         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 930         deliver_irq_t func;
 931         int rc = 0;
 932         unsigned long irq_type;
 933         unsigned long irqs;
 934
 935         __reset_intercept_indicators(vcpu);
 936
 937         /* pending ckc conditions might have been invalidated */
 938         clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
 939         if (ckc_irq_pending(vcpu))
 940                 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
 941
 942         /* pending cpu timer conditions might have been invalidated */
 943         clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
 944         if (cpu_timer_irq_pending(vcpu))
 945                 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
 946
 947         while ((irqs = deliverable_irqs(vcpu)) && !rc) {
 948                 /* bits are in the order of interrupt priority */
 949                 irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT);
 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         }
 962
 963         set_intercept_indicators(vcpu);
 964
 965         return rc;
 966 }
 967
 968 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
 969 {
 970         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 971
 972         VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
 973         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
 974                                    irq->u.pgm.code, 0);
 975
 976         li->irq.pgm = irq->u.pgm;
 977         set_bit(IRQ_PEND_PROG, &li->pending_irqs);
 978         return 0;
 979 }
 980
 981 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 982 {
 983         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 984         struct kvm_s390_irq irq;
 985
 986         spin_lock(&li->lock);
 987         irq.u.pgm.code = code;
 988         __inject_prog(vcpu, &irq);
 989         BUG_ON(waitqueue_active(li->wq));
 990         spin_unlock(&li->lock);
 991         return 0;
 992 }
 993
 994 int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
 995                              struct kvm_s390_pgm_info *pgm_info)
 996 {
 997         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 998         struct kvm_s390_irq irq;
 999         int rc;
1000
1001         spin_lock(&li->lock);
1002         irq.u.pgm = *pgm_info;
1003         rc = __inject_prog(vcpu, &irq);
1004         BUG_ON(waitqueue_active(li->wq));
1005         spin_unlock(&li->lock);
1006         return rc;
1007 }
1008
1009 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1010 {
1011         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1012
1013         VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
1014                    irq->u.ext.ext_params2);
1015         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1016                                    irq->u.ext.ext_params,
1017                                    irq->u.ext.ext_params2);
1018
1019         li->irq.ext = irq->u.ext;
1020         set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1021         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1022         return 0;
1023 }
1024
1025 static int __inject_extcall_sigpif(struct kvm_vcpu *vcpu, uint16_t src_id)
1026 {
1027         unsigned char new_val, old_val;
1028         uint8_t *sigp_ctrl = &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
1029
1030         new_val = SIGP_CTRL_C | (src_id & SIGP_CTRL_SCN_MASK);
1031         old_val = *sigp_ctrl & ~SIGP_CTRL_C;
1032         if (cmpxchg(sigp_ctrl, old_val, new_val) != old_val) {
1033                 /* another external call is pending */
1034                 return -EBUSY;
1035         }
1036         atomic_set_mask(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
1037         return 0;
1038 }
1039
1040 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1041 {
1042         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1043         struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1044         uint16_t src_id = irq->u.extcall.code;
1045
1046         VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1047                    src_id);
1048         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1049                                    src_id, 0);
1050
1051         /* sending vcpu invalid */
1052         if (src_id >= KVM_MAX_VCPUS ||
1053             kvm_get_vcpu(vcpu->kvm, src_id) == NULL)
1054                 return -EINVAL;
1055
1056         if (sclp.has_sigpif)
1057                 return __inject_extcall_sigpif(vcpu, src_id);
1058
1059         if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1060                 return -EBUSY;
1061         *extcall = irq->u.extcall;
1062         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1063         return 0;
1064 }
1065
1066 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1067 {
1068         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1069         struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1070
1071         VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1072                    irq->u.prefix.address);
1073         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1074                                    irq->u.prefix.address, 0);
1075
1076         if (!is_vcpu_stopped(vcpu))
1077                 return -EBUSY;
1078
1079         *prefix = irq->u.prefix;
1080         set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1081         return 0;
1082 }
1083
1084 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1085 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1086 {
1087         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1088         struct kvm_s390_stop_info *stop = &li->irq.stop;
1089         int rc = 0;
1090
1091         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1092
1093         if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1094                 return -EINVAL;
1095
1096         if (is_vcpu_stopped(vcpu)) {
1097                 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1098                         rc = kvm_s390_store_status_unloaded(vcpu,
1099                                                 KVM_S390_STORE_STATUS_NOADDR);
1100                 return rc;
1101         }
1102
1103         if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1104                 return -EBUSY;
1105         stop->flags = irq->u.stop.flags;
1106         __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
1107         return 0;
1108 }
1109
1110 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1111                                  struct kvm_s390_irq *irq)
1112 {
1113         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1114
1115         VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1116         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1117
1118         set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1119         return 0;
1120 }
1121
1122 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1123                                    struct kvm_s390_irq *irq)
1124 {
1125         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1126
1127         VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1128                    irq->u.emerg.code);
1129         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1130                                    irq->u.emerg.code, 0);
1131
1132         set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1133         set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1134         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1135         return 0;
1136 }
1137
1138 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1139 {
1140         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1141         struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1142
1143         VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1144                    irq->u.mchk.mcic);
1145         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1146                                    irq->u.mchk.mcic);
1147
1148         /*
1149          * Because repressible machine checks can be indicated along with
1150          * exigent machine checks (PoP, Chapter 11, Interruption action)
1151          * we need to combine cr14, mcic and external damage code.
1152          * Failing storage address and the logout area should not be or'ed
1153          * together, we just indicate the last occurrence of the corresponding
1154          * machine check
1155          */
1156         mchk->cr14 |= irq->u.mchk.cr14;
1157         mchk->mcic |= irq->u.mchk.mcic;
1158         mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1159         mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1160         memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1161                sizeof(mchk->fixed_logout));
1162         if (mchk->mcic & MCHK_EX_MASK)
1163                 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1164         else if (mchk->mcic & MCHK_REP_MASK)
1165                 set_bit(IRQ_PEND_MCHK_REP,  &li->pending_irqs);
1166         return 0;
1167 }
1168
1169 static int __inject_ckc(struct kvm_vcpu *vcpu)
1170 {
1171         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1172
1173         VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1174         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1175                                    0, 0);
1176
1177         set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1178         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1179         return 0;
1180 }
1181
1182 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1183 {
1184         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1185
1186         VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1187         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1188                                    0, 0);
1189
1190         set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1191         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1192         return 0;
1193 }
1194
1195 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1196                                                   int isc, u32 schid)
1197 {
1198         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1199         struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1200         struct kvm_s390_interrupt_info *iter;
1201         u16 id = (schid & 0xffff0000U) >> 16;
1202         u16 nr = schid & 0x0000ffffU;
1203
1204         spin_lock(&fi->lock);
1205         list_for_each_entry(iter, isc_list, list) {
1206                 if (schid && (id != iter->io.subchannel_id ||
1207                               nr != iter->io.subchannel_nr))
1208                         continue;
1209                 /* found an appropriate entry */
1210                 list_del_init(&iter->list);
1211                 fi->counters[FIRQ_CNTR_IO] -= 1;
1212                 if (list_empty(isc_list))
1213                         clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1214                 spin_unlock(&fi->lock);
1215                 return iter;
1216         }
1217         spin_unlock(&fi->lock);
1218         return NULL;
1219 }
1220
1221 /*
1222  * Dequeue and return an I/O interrupt matching any of the interruption
1223  * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1224  */
1225 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1226                                                     u64 isc_mask, u32 schid)
1227 {
1228         struct kvm_s390_interrupt_info *inti = NULL;
1229         int isc;
1230
1231         for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1232                 if (isc_mask & isc_to_isc_bits(isc))
1233                         inti = get_io_int(kvm, isc, schid);
1234         }
1235         return inti;
1236 }
1237
1238 #define SCCB_MASK 0xFFFFFFF8
1239 #define SCCB_EVENT_PENDING 0x3
1240
1241 static int __inject_service(struct kvm *kvm,
1242                              struct kvm_s390_interrupt_info *inti)
1243 {
1244         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1245
1246         spin_lock(&fi->lock);
1247         fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1248         /*
1249          * Early versions of the QEMU s390 bios will inject several
1250          * service interrupts after another without handling a
1251          * condition code indicating busy.
1252          * We will silently ignore those superfluous sccb values.
1253          * A future version of QEMU will take care of serialization
1254          * of servc requests
1255          */
1256         if (fi->srv_signal.ext_params & SCCB_MASK)
1257                 goto out;
1258         fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1259         set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1260 out:
1261         spin_unlock(&fi->lock);
1262         kfree(inti);
1263         return 0;
1264 }
1265
1266 static int __inject_virtio(struct kvm *kvm,
1267                             struct kvm_s390_interrupt_info *inti)
1268 {
1269         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1270
1271         spin_lock(&fi->lock);
1272         if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1273                 spin_unlock(&fi->lock);
1274                 return -EBUSY;
1275         }
1276         fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1277         list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1278         set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1279         spin_unlock(&fi->lock);
1280         return 0;
1281 }
1282
1283 static int __inject_pfault_done(struct kvm *kvm,
1284                                  struct kvm_s390_interrupt_info *inti)
1285 {
1286         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1287
1288         spin_lock(&fi->lock);
1289         if (fi->counters[FIRQ_CNTR_PFAULT] >=
1290                 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1291                 spin_unlock(&fi->lock);
1292                 return -EBUSY;
1293         }
1294         fi->counters[FIRQ_CNTR_PFAULT] += 1;
1295         list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1296         set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1297         spin_unlock(&fi->lock);
1298         return 0;
1299 }
1300
1301 #define CR_PENDING_SUBCLASS 28
1302 static int __inject_float_mchk(struct kvm *kvm,
1303                                 struct kvm_s390_interrupt_info *inti)
1304 {
1305         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1306
1307         spin_lock(&fi->lock);
1308         fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1309         fi->mchk.mcic |= inti->mchk.mcic;
1310         set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1311         spin_unlock(&fi->lock);
1312         kfree(inti);
1313         return 0;
1314 }
1315
1316 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1317 {
1318         struct kvm_s390_float_interrupt *fi;
1319         struct list_head *list;
1320         int isc;
1321
1322         fi = &kvm->arch.float_int;
1323         spin_lock(&fi->lock);
1324         if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1325                 spin_unlock(&fi->lock);
1326                 return -EBUSY;
1327         }
1328         fi->counters[FIRQ_CNTR_IO] += 1;
1329
1330         isc = int_word_to_isc(inti->io.io_int_word);
1331         list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1332         list_add_tail(&inti->list, list);
1333         set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1334         spin_unlock(&fi->lock);
1335         return 0;
1336 }
1337
1338 /*
1339  * Find a destination VCPU for a floating irq and kick it.
1340  */
1341 static void __floating_irq_kick(struct kvm *kvm, u64 type)
1342 {
1343         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1344         struct kvm_s390_local_interrupt *li;
1345         struct kvm_vcpu *dst_vcpu;
1346         int sigcpu, online_vcpus, nr_tries = 0;
1347
1348         online_vcpus = atomic_read(&kvm->online_vcpus);
1349         if (!online_vcpus)
1350                 return;
1351
1352         /* find idle VCPUs first, then round robin */
1353         sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
1354         if (sigcpu == online_vcpus) {
1355                 do {
1356                         sigcpu = fi->next_rr_cpu;
1357                         fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
1358                         /* avoid endless loops if all vcpus are stopped */
1359                         if (nr_tries++ >= online_vcpus)
1360                                 return;
1361                 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1362         }
1363         dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1364
1365         /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1366         li = &dst_vcpu->arch.local_int;
1367         spin_lock(&li->lock);
1368         switch (type) {
1369         case KVM_S390_MCHK:
1370                 atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
1371                 break;
1372         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1373                 atomic_set_mask(CPUSTAT_IO_INT, li->cpuflags);
1374                 break;
1375         default:
1376                 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1377                 break;
1378         }
1379         spin_unlock(&li->lock);
1380         kvm_s390_vcpu_wakeup(dst_vcpu);
1381 }
1382
1383 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1384 {
1385         struct kvm_s390_float_interrupt *fi;
1386         u64 type = READ_ONCE(inti->type);
1387         int rc;
1388
1389         fi = &kvm->arch.float_int;
1390
1391         switch (type) {
1392         case KVM_S390_MCHK:
1393                 rc = __inject_float_mchk(kvm, inti);
1394                 break;
1395         case KVM_S390_INT_VIRTIO:
1396                 rc = __inject_virtio(kvm, inti);
1397                 break;
1398         case KVM_S390_INT_SERVICE:
1399                 rc = __inject_service(kvm, inti);
1400                 break;
1401         case KVM_S390_INT_PFAULT_DONE:
1402                 rc = __inject_pfault_done(kvm, inti);
1403                 break;
1404         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1405                 rc = __inject_io(kvm, inti);
1406                 break;
1407         default:
1408                 rc = -EINVAL;
1409         }
1410         if (rc)
1411                 return rc;
1412
1413         __floating_irq_kick(kvm, type);
1414         return 0;
1415 }
1416
1417 int kvm_s390_inject_vm(struct kvm *kvm,
1418                        struct kvm_s390_interrupt *s390int)
1419 {
1420         struct kvm_s390_interrupt_info *inti;
1421         int rc;
1422
1423         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1424         if (!inti)
1425                 return -ENOMEM;
1426
1427         inti->type = s390int->type;
1428         switch (inti->type) {
1429         case KVM_S390_INT_VIRTIO:
1430                 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1431                          s390int->parm, s390int->parm64);
1432                 inti->ext.ext_params = s390int->parm;
1433                 inti->ext.ext_params2 = s390int->parm64;
1434                 break;
1435         case KVM_S390_INT_SERVICE:
1436                 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1437                 inti->ext.ext_params = s390int->parm;
1438                 break;
1439         case KVM_S390_INT_PFAULT_DONE:
1440                 inti->ext.ext_params2 = s390int->parm64;
1441                 break;
1442         case KVM_S390_MCHK:
1443                 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1444                          s390int->parm64);
1445                 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1446                 inti->mchk.mcic = s390int->parm64;
1447                 break;
1448         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1449                 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1450                         VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
1451                 else
1452                         VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
1453                                  s390int->type & IOINT_CSSID_MASK,
1454                                  s390int->type & IOINT_SSID_MASK,
1455                                  s390int->type & IOINT_SCHID_MASK);
1456                 inti->io.subchannel_id = s390int->parm >> 16;
1457                 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1458                 inti->io.io_int_parm = s390int->parm64 >> 32;
1459                 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1460                 break;
1461         default:
1462                 kfree(inti);
1463                 return -EINVAL;
1464         }
1465         trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1466                                  2);
1467
1468         rc = __inject_vm(kvm, inti);
1469         if (rc)
1470                 kfree(inti);
1471         return rc;
1472 }
1473
1474 int kvm_s390_reinject_io_int(struct kvm *kvm,
1475                               struct kvm_s390_interrupt_info *inti)
1476 {
1477         return __inject_vm(kvm, inti);
1478 }
1479
1480 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1481                        struct kvm_s390_irq *irq)
1482 {
1483         irq->type = s390int->type;
1484         switch (irq->type) {
1485         case KVM_S390_PROGRAM_INT:
1486                 if (s390int->parm & 0xffff0000)
1487                         return -EINVAL;
1488                 irq->u.pgm.code = s390int->parm;
1489                 break;
1490         case KVM_S390_SIGP_SET_PREFIX:
1491                 irq->u.prefix.address = s390int->parm;
1492                 break;
1493         case KVM_S390_SIGP_STOP:
1494                 irq->u.stop.flags = s390int->parm;
1495                 break;
1496         case KVM_S390_INT_EXTERNAL_CALL:
1497                 if (s390int->parm & 0xffff0000)
1498                         return -EINVAL;
1499                 irq->u.extcall.code = s390int->parm;
1500                 break;
1501         case KVM_S390_INT_EMERGENCY:
1502                 if (s390int->parm & 0xffff0000)
1503                         return -EINVAL;
1504                 irq->u.emerg.code = s390int->parm;
1505                 break;
1506         case KVM_S390_MCHK:
1507                 irq->u.mchk.mcic = s390int->parm64;
1508                 break;
1509         }
1510         return 0;
1511 }
1512
1513 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1514 {
1515         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1516
1517         return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1518 }
1519
1520 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1521 {
1522         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1523
1524         spin_lock(&li->lock);
1525         li->irq.stop.flags = 0;
1526         clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1527         spin_unlock(&li->lock);
1528 }
1529
1530 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1531 {
1532         int rc;
1533
1534         switch (irq->type) {
1535         case KVM_S390_PROGRAM_INT:
1536                 rc = __inject_prog(vcpu, irq);
1537                 break;
1538         case KVM_S390_SIGP_SET_PREFIX:
1539                 rc = __inject_set_prefix(vcpu, irq);
1540                 break;
1541         case KVM_S390_SIGP_STOP:
1542                 rc = __inject_sigp_stop(vcpu, irq);
1543                 break;
1544         case KVM_S390_RESTART:
1545                 rc = __inject_sigp_restart(vcpu, irq);
1546                 break;
1547         case KVM_S390_INT_CLOCK_COMP:
1548                 rc = __inject_ckc(vcpu);
1549                 break;
1550         case KVM_S390_INT_CPU_TIMER:
1551                 rc = __inject_cpu_timer(vcpu);
1552                 break;
1553         case KVM_S390_INT_EXTERNAL_CALL:
1554                 rc = __inject_extcall(vcpu, irq);
1555                 break;
1556         case KVM_S390_INT_EMERGENCY:
1557                 rc = __inject_sigp_emergency(vcpu, irq);
1558                 break;
1559         case KVM_S390_MCHK:
1560                 rc = __inject_mchk(vcpu, irq);
1561                 break;
1562         case KVM_S390_INT_PFAULT_INIT:
1563                 rc = __inject_pfault_init(vcpu, irq);
1564                 break;
1565         case KVM_S390_INT_VIRTIO:
1566         case KVM_S390_INT_SERVICE:
1567         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1568         default:
1569                 rc = -EINVAL;
1570         }
1571
1572         return rc;
1573 }
1574
1575 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1576 {
1577         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1578         int rc;
1579
1580         spin_lock(&li->lock);
1581         rc = do_inject_vcpu(vcpu, irq);
1582         spin_unlock(&li->lock);
1583         if (!rc)
1584                 kvm_s390_vcpu_wakeup(vcpu);
1585         return rc;
1586 }
1587
1588 static inline void clear_irq_list(struct list_head *_list)
1589 {
1590         struct kvm_s390_interrupt_info *inti, *n;
1591
1592         list_for_each_entry_safe(inti, n, _list, list) {
1593                 list_del(&inti->list);
1594                 kfree(inti);
1595         }
1596 }
1597
1598 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1599                        struct kvm_s390_irq *irq)
1600 {
1601         irq->type = inti->type;
1602         switch (inti->type) {
1603         case KVM_S390_INT_PFAULT_INIT:
1604         case KVM_S390_INT_PFAULT_DONE:
1605         case KVM_S390_INT_VIRTIO:
1606                 irq->u.ext = inti->ext;
1607                 break;
1608         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1609                 irq->u.io = inti->io;
1610                 break;
1611         }
1612 }
1613
1614 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1615 {
1616         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1617         int i;
1618
1619         spin_lock(&fi->lock);
1620         fi->pending_irqs = 0;
1621         memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
1622         memset(&fi->mchk, 0, sizeof(fi->mchk));
1623         for (i = 0; i < FIRQ_LIST_COUNT; i++)
1624                 clear_irq_list(&fi->lists[i]);
1625         for (i = 0; i < FIRQ_MAX_COUNT; i++)
1626                 fi->counters[i] = 0;
1627         spin_unlock(&fi->lock);
1628 };
1629
1630 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1631 {
1632         struct kvm_s390_interrupt_info *inti;
1633         struct kvm_s390_float_interrupt *fi;
1634         struct kvm_s390_irq *buf;
1635         struct kvm_s390_irq *irq;
1636         int max_irqs;
1637         int ret = 0;
1638         int n = 0;
1639         int i;
1640
1641         if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
1642                 return -EINVAL;
1643
1644         /*
1645          * We are already using -ENOMEM to signal
1646          * userspace it may retry with a bigger buffer,
1647          * so we need to use something else for this case
1648          */
1649         buf = vzalloc(len);
1650         if (!buf)
1651                 return -ENOBUFS;
1652
1653         max_irqs = len / sizeof(struct kvm_s390_irq);
1654
1655         fi = &kvm->arch.float_int;
1656         spin_lock(&fi->lock);
1657         for (i = 0; i < FIRQ_LIST_COUNT; i++) {
1658                 list_for_each_entry(inti, &fi->lists[i], list) {
1659                         if (n == max_irqs) {
1660                                 /* signal userspace to try again */
1661                                 ret = -ENOMEM;
1662                                 goto out;
1663                         }
1664                         inti_to_irq(inti, &buf[n]);
1665                         n++;
1666                 }
1667         }
1668         if (test_bit(IRQ_PEND_EXT_SERVICE, &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_INT_SERVICE;
1676                 irq->u.ext = fi->srv_signal;
1677                 n++;
1678         }
1679         if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
1680                 if (n == max_irqs) {
1681                                 /* signal userspace to try again */
1682                                 ret = -ENOMEM;
1683                                 goto out;
1684                 }
1685                 irq = (struct kvm_s390_irq *) &buf[n];
1686                 irq->type = KVM_S390_MCHK;
1687                 irq->u.mchk = fi->mchk;
1688                 n++;
1689 }
1690
1691 out:
1692         spin_unlock(&fi->lock);
1693         if (!ret && n > 0) {
1694                 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
1695                         ret = -EFAULT;
1696         }
1697         vfree(buf);
1698
1699         return ret < 0 ? ret : n;
1700 }
1701
1702 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1703 {
1704         int r;
1705
1706         switch (attr->group) {
1707         case KVM_DEV_FLIC_GET_ALL_IRQS:
1708                 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
1709                                           attr->attr);
1710                 break;
1711         default:
1712                 r = -EINVAL;
1713         }
1714
1715         return r;
1716 }
1717
1718 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1719                                      u64 addr)
1720 {
1721         struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1722         void *target = NULL;
1723         void __user *source;
1724         u64 size;
1725
1726         if (get_user(inti->type, (u64 __user *)addr))
1727                 return -EFAULT;
1728
1729         switch (inti->type) {
1730         case KVM_S390_INT_PFAULT_INIT:
1731         case KVM_S390_INT_PFAULT_DONE:
1732         case KVM_S390_INT_VIRTIO:
1733         case KVM_S390_INT_SERVICE:
1734                 target = (void *) &inti->ext;
1735                 source = &uptr->u.ext;
1736                 size = sizeof(inti->ext);
1737                 break;
1738         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1739                 target = (void *) &inti->io;
1740                 source = &uptr->u.io;
1741                 size = sizeof(inti->io);
1742                 break;
1743         case KVM_S390_MCHK:
1744                 target = (void *) &inti->mchk;
1745                 source = &uptr->u.mchk;
1746                 size = sizeof(inti->mchk);
1747                 break;
1748         default:
1749                 return -EINVAL;
1750         }
1751
1752         if (copy_from_user(target, source, size))
1753                 return -EFAULT;
1754
1755         return 0;
1756 }
1757
1758 static int enqueue_floating_irq(struct kvm_device *dev,
1759                                 struct kvm_device_attr *attr)
1760 {
1761         struct kvm_s390_interrupt_info *inti = NULL;
1762         int r = 0;
1763         int len = attr->attr;
1764
1765         if (len % sizeof(struct kvm_s390_irq) != 0)
1766                 return -EINVAL;
1767         else if (len > KVM_S390_FLIC_MAX_BUFFER)
1768                 return -EINVAL;
1769
1770         while (len >= sizeof(struct kvm_s390_irq)) {
1771                 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1772                 if (!inti)
1773                         return -ENOMEM;
1774
1775                 r = copy_irq_from_user(inti, attr->addr);
1776                 if (r) {
1777                         kfree(inti);
1778                         return r;
1779                 }
1780                 r = __inject_vm(dev->kvm, inti);
1781                 if (r) {
1782                         kfree(inti);
1783                         return r;
1784                 }
1785                 len -= sizeof(struct kvm_s390_irq);
1786                 attr->addr += sizeof(struct kvm_s390_irq);
1787         }
1788
1789         return r;
1790 }
1791
1792 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1793 {
1794         if (id >= MAX_S390_IO_ADAPTERS)
1795                 return NULL;
1796         return kvm->arch.adapters[id];
1797 }
1798
1799 static int register_io_adapter(struct kvm_device *dev,
1800                                struct kvm_device_attr *attr)
1801 {
1802         struct s390_io_adapter *adapter;
1803         struct kvm_s390_io_adapter adapter_info;
1804
1805         if (copy_from_user(&adapter_info,
1806                            (void __user *)attr->addr, sizeof(adapter_info)))
1807                 return -EFAULT;
1808
1809         if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1810             (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1811                 return -EINVAL;
1812
1813         adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1814         if (!adapter)
1815                 return -ENOMEM;
1816
1817         INIT_LIST_HEAD(&adapter->maps);
1818         init_rwsem(&adapter->maps_lock);
1819         atomic_set(&adapter->nr_maps, 0);
1820         adapter->id = adapter_info.id;
1821         adapter->isc = adapter_info.isc;
1822         adapter->maskable = adapter_info.maskable;
1823         adapter->masked = false;
1824         adapter->swap = adapter_info.swap;
1825         dev->kvm->arch.adapters[adapter->id] = adapter;
1826
1827         return 0;
1828 }
1829
1830 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1831 {
1832         int ret;
1833         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1834
1835         if (!adapter || !adapter->maskable)
1836                 return -EINVAL;
1837         ret = adapter->masked;
1838         adapter->masked = masked;
1839         return ret;
1840 }
1841
1842 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1843 {
1844         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1845         struct s390_map_info *map;
1846         int ret;
1847
1848         if (!adapter || !addr)
1849                 return -EINVAL;
1850
1851         map = kzalloc(sizeof(*map), GFP_KERNEL);
1852         if (!map) {
1853                 ret = -ENOMEM;
1854                 goto out;
1855         }
1856         INIT_LIST_HEAD(&map->list);
1857         map->guest_addr = addr;
1858         map->addr = gmap_translate(kvm->arch.gmap, addr);
1859         if (map->addr == -EFAULT) {
1860                 ret = -EFAULT;
1861                 goto out;
1862         }
1863         ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1864         if (ret < 0)
1865                 goto out;
1866         BUG_ON(ret != 1);
1867         down_write(&adapter->maps_lock);
1868         if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1869                 list_add_tail(&map->list, &adapter->maps);
1870                 ret = 0;
1871         } else {
1872                 put_page(map->page);
1873                 ret = -EINVAL;
1874         }
1875         up_write(&adapter->maps_lock);
1876 out:
1877         if (ret)
1878                 kfree(map);
1879         return ret;
1880 }
1881
1882 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1883 {
1884         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1885         struct s390_map_info *map, *tmp;
1886         int found = 0;
1887
1888         if (!adapter || !addr)
1889                 return -EINVAL;
1890
1891         down_write(&adapter->maps_lock);
1892         list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1893                 if (map->guest_addr == addr) {
1894                         found = 1;
1895                         atomic_dec(&adapter->nr_maps);
1896                         list_del(&map->list);
1897                         put_page(map->page);
1898                         kfree(map);
1899                         break;
1900                 }
1901         }
1902         up_write(&adapter->maps_lock);
1903
1904         return found ? 0 : -EINVAL;
1905 }
1906
1907 void kvm_s390_destroy_adapters(struct kvm *kvm)
1908 {
1909         int i;
1910         struct s390_map_info *map, *tmp;
1911
1912         for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
1913                 if (!kvm->arch.adapters[i])
1914                         continue;
1915                 list_for_each_entry_safe(map, tmp,
1916                                          &kvm->arch.adapters[i]->maps, list) {
1917                         list_del(&map->list);
1918                         put_page(map->page);
1919                         kfree(map);
1920                 }
1921                 kfree(kvm->arch.adapters[i]);
1922         }
1923 }
1924
1925 static int modify_io_adapter(struct kvm_device *dev,
1926                              struct kvm_device_attr *attr)
1927 {
1928         struct kvm_s390_io_adapter_req req;
1929         struct s390_io_adapter *adapter;
1930         int ret;
1931
1932         if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
1933                 return -EFAULT;
1934
1935         adapter = get_io_adapter(dev->kvm, req.id);
1936         if (!adapter)
1937                 return -EINVAL;
1938         switch (req.type) {
1939         case KVM_S390_IO_ADAPTER_MASK:
1940                 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
1941                 if (ret > 0)
1942                         ret = 0;
1943                 break;
1944         case KVM_S390_IO_ADAPTER_MAP:
1945                 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
1946                 break;
1947         case KVM_S390_IO_ADAPTER_UNMAP:
1948                 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
1949                 break;
1950         default:
1951                 ret = -EINVAL;
1952         }
1953
1954         return ret;
1955 }
1956
1957 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1958 {
1959         int r = 0;
1960         unsigned int i;
1961         struct kvm_vcpu *vcpu;
1962
1963         switch (attr->group) {
1964         case KVM_DEV_FLIC_ENQUEUE:
1965                 r = enqueue_floating_irq(dev, attr);
1966                 break;
1967         case KVM_DEV_FLIC_CLEAR_IRQS:
1968                 kvm_s390_clear_float_irqs(dev->kvm);
1969                 break;
1970         case KVM_DEV_FLIC_APF_ENABLE:
1971                 dev->kvm->arch.gmap->pfault_enabled = 1;
1972                 break;
1973         case KVM_DEV_FLIC_APF_DISABLE_WAIT:
1974                 dev->kvm->arch.gmap->pfault_enabled = 0;
1975                 /*
1976                  * Make sure no async faults are in transition when
1977                  * clearing the queues. So we don't need to worry
1978                  * about late coming workers.
1979                  */
1980                 synchronize_srcu(&dev->kvm->srcu);
1981                 kvm_for_each_vcpu(i, vcpu, dev->kvm)
1982                         kvm_clear_async_pf_completion_queue(vcpu);
1983                 break;
1984         case KVM_DEV_FLIC_ADAPTER_REGISTER:
1985                 r = register_io_adapter(dev, attr);
1986                 break;
1987         case KVM_DEV_FLIC_ADAPTER_MODIFY:
1988                 r = modify_io_adapter(dev, attr);
1989                 break;
1990         default:
1991                 r = -EINVAL;
1992         }
1993
1994         return r;
1995 }
1996
1997 static int flic_create(struct kvm_device *dev, u32 type)
1998 {
1999         if (!dev)
2000                 return -EINVAL;
2001         if (dev->kvm->arch.flic)
2002                 return -EINVAL;
2003         dev->kvm->arch.flic = dev;
2004         return 0;
2005 }
2006
2007 static void flic_destroy(struct kvm_device *dev)
2008 {
2009         dev->kvm->arch.flic = NULL;
2010         kfree(dev);
2011 }
2012
2013 /* s390 floating irq controller (flic) */
2014 struct kvm_device_ops kvm_flic_ops = {
2015         .name = "kvm-flic",
2016         .get_attr = flic_get_attr,
2017         .set_attr = flic_set_attr,
2018         .create = flic_create,
2019         .destroy = flic_destroy,
2020 };
2021
2022 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2023 {
2024         unsigned long bit;
2025
2026         bit = bit_nr + (addr % PAGE_SIZE) * 8;
2027
2028         return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2029 }
2030
2031 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2032                                           u64 addr)
2033 {
2034         struct s390_map_info *map;
2035
2036         if (!adapter)
2037                 return NULL;
2038
2039         list_for_each_entry(map, &adapter->maps, list) {
2040                 if (map->guest_addr == addr)
2041                         return map;
2042         }
2043         return NULL;
2044 }
2045
2046 static int adapter_indicators_set(struct kvm *kvm,
2047                                   struct s390_io_adapter *adapter,
2048                                   struct kvm_s390_adapter_int *adapter_int)
2049 {
2050         unsigned long bit;
2051         int summary_set, idx;
2052         struct s390_map_info *info;
2053         void *map;
2054
2055         info = get_map_info(adapter, adapter_int->ind_addr);
2056         if (!info)
2057                 return -1;
2058         map = page_address(info->page);
2059         bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2060         set_bit(bit, map);
2061         idx = srcu_read_lock(&kvm->srcu);
2062         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2063         set_page_dirty_lock(info->page);
2064         info = get_map_info(adapter, adapter_int->summary_addr);
2065         if (!info) {
2066                 srcu_read_unlock(&kvm->srcu, idx);
2067                 return -1;
2068         }
2069         map = page_address(info->page);
2070         bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2071                           adapter->swap);
2072         summary_set = test_and_set_bit(bit, map);
2073         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2074         set_page_dirty_lock(info->page);
2075         srcu_read_unlock(&kvm->srcu, idx);
2076         return summary_set ? 0 : 1;
2077 }
2078
2079 /*
2080  * < 0 - not injected due to error
2081  * = 0 - coalesced, summary indicator already active
2082  * > 0 - injected interrupt
2083  */
2084 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2085                            struct kvm *kvm, int irq_source_id, int level,
2086                            bool line_status)
2087 {
2088         int ret;
2089         struct s390_io_adapter *adapter;
2090
2091         /* We're only interested in the 0->1 transition. */
2092         if (!level)
2093                 return 0;
2094         adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2095         if (!adapter)
2096                 return -1;
2097         down_read(&adapter->maps_lock);
2098         ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2099         up_read(&adapter->maps_lock);
2100         if ((ret > 0) && !adapter->masked) {
2101                 struct kvm_s390_interrupt s390int = {
2102                         .type = KVM_S390_INT_IO(1, 0, 0, 0),
2103                         .parm = 0,
2104                         .parm64 = (adapter->isc << 27) | 0x80000000,
2105                 };
2106                 ret = kvm_s390_inject_vm(kvm, &s390int);
2107                 if (ret == 0)
2108                         ret = 1;
2109         }
2110         return ret;
2111 }
2112
2113 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
2114                           const struct kvm_irq_routing_entry *ue)
2115 {
2116         int ret;
2117
2118         switch (ue->type) {
2119         case KVM_IRQ_ROUTING_S390_ADAPTER:
2120                 e->set = set_adapter_int;
2121                 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2122                 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2123                 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2124                 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2125                 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2126                 ret = 0;
2127                 break;
2128         default:
2129                 ret = -EINVAL;
2130         }
2131
2132         return ret;
2133 }
2134
2135 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2136                 int irq_source_id, int level, bool line_status)
2137 {
2138         return -EINVAL;
2139 }
2140
2141 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2142 {
2143         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2144         struct kvm_s390_irq *buf;
2145         int r = 0;
2146         int n;
2147
2148         buf = vmalloc(len);
2149         if (!buf)
2150                 return -ENOMEM;
2151
2152         if (copy_from_user((void *) buf, irqstate, len)) {
2153                 r = -EFAULT;
2154                 goto out_free;
2155         }
2156
2157         /*
2158          * Don't allow setting the interrupt state
2159          * when there are already interrupts pending
2160          */
2161         spin_lock(&li->lock);
2162         if (li->pending_irqs) {
2163                 r = -EBUSY;
2164                 goto out_unlock;
2165         }
2166
2167         for (n = 0; n < len / sizeof(*buf); n++) {
2168                 r = do_inject_vcpu(vcpu, &buf[n]);
2169                 if (r)
2170                         break;
2171         }
2172
2173 out_unlock:
2174         spin_unlock(&li->lock);
2175 out_free:
2176         vfree(buf);
2177
2178         return r;
2179 }
2180
2181 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2182                             struct kvm_s390_irq *irq,
2183                             unsigned long irq_type)
2184 {
2185         switch (irq_type) {
2186         case IRQ_PEND_MCHK_EX:
2187         case IRQ_PEND_MCHK_REP:
2188                 irq->type = KVM_S390_MCHK;
2189                 irq->u.mchk = li->irq.mchk;
2190                 break;
2191         case IRQ_PEND_PROG:
2192                 irq->type = KVM_S390_PROGRAM_INT;
2193                 irq->u.pgm = li->irq.pgm;
2194                 break;
2195         case IRQ_PEND_PFAULT_INIT:
2196                 irq->type = KVM_S390_INT_PFAULT_INIT;
2197                 irq->u.ext = li->irq.ext;
2198                 break;
2199         case IRQ_PEND_EXT_EXTERNAL:
2200                 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2201                 irq->u.extcall = li->irq.extcall;
2202                 break;
2203         case IRQ_PEND_EXT_CLOCK_COMP:
2204                 irq->type = KVM_S390_INT_CLOCK_COMP;
2205                 break;
2206         case IRQ_PEND_EXT_CPU_TIMER:
2207                 irq->type = KVM_S390_INT_CPU_TIMER;
2208                 break;
2209         case IRQ_PEND_SIGP_STOP:
2210                 irq->type = KVM_S390_SIGP_STOP;
2211                 irq->u.stop = li->irq.stop;
2212                 break;
2213         case IRQ_PEND_RESTART:
2214                 irq->type = KVM_S390_RESTART;
2215                 break;
2216         case IRQ_PEND_SET_PREFIX:
2217                 irq->type = KVM_S390_SIGP_SET_PREFIX;
2218                 irq->u.prefix = li->irq.prefix;
2219                 break;
2220         }
2221 }
2222
2223 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2224 {
2225         uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
2226         unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2227         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2228         unsigned long pending_irqs;
2229         struct kvm_s390_irq irq;
2230         unsigned long irq_type;
2231         int cpuaddr;
2232         int n = 0;
2233
2234         spin_lock(&li->lock);
2235         pending_irqs = li->pending_irqs;
2236         memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2237                sizeof(sigp_emerg_pending));
2238         spin_unlock(&li->lock);
2239
2240         for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2241                 memset(&irq, 0, sizeof(irq));
2242                 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2243                         continue;
2244                 if (n + sizeof(irq) > len)
2245                         return -ENOBUFS;
2246                 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2247                 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2248                         return -EFAULT;
2249                 n += sizeof(irq);
2250         }
2251
2252         if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2253                 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2254                         memset(&irq, 0, sizeof(irq));
2255                         if (n + sizeof(irq) > len)
2256                                 return -ENOBUFS;
2257                         irq.type = KVM_S390_INT_EMERGENCY;
2258                         irq.u.emerg.code = cpuaddr;
2259                         if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2260                                 return -EFAULT;
2261                         n += sizeof(irq);
2262                 }
2263         }
2264
2265         if ((sigp_ctrl & SIGP_CTRL_C) &&
2266             (atomic_read(&vcpu->arch.sie_block->cpuflags) &
2267              CPUSTAT_ECALL_PEND)) {
2268                 if (n + sizeof(irq) > len)
2269                         return -ENOBUFS;
2270                 memset(&irq, 0, sizeof(irq));
2271                 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2272                 irq.u.extcall.code = sigp_ctrl & SIGP_CTRL_SCN_MASK;
2273                 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2274                         return -EFAULT;
2275                 n += sizeof(irq);
2276         }
2277
2278         return n;
2279 }