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 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         return psw_extint_disabled(vcpu) &&
  55                psw_ioint_disabled(vcpu) &&
  56                psw_mchk_disabled(vcpu);
  57 }
  58
  59 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
  60 {
  61         if (psw_extint_disabled(vcpu) ||
  62             !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
  63                 return 0;
  64         if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
  65                 /* No timer interrupts when single stepping */
  66                 return 0;
  67         return 1;
  68 }
  69
  70 static int ckc_irq_pending(struct kvm_vcpu *vcpu)
  71 {
  72         if (vcpu->arch.sie_block->ckc >= kvm_s390_get_tod_clock_fast(vcpu->kvm))
  73                 return 0;
  74         return ckc_interrupts_enabled(vcpu);
  75 }
  76
  77 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
  78 {
  79         return !psw_extint_disabled(vcpu) &&
  80                (vcpu->arch.sie_block->gcr[0] & 0x400ul);
  81 }
  82
  83 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
  84 {
  85         return (vcpu->arch.sie_block->cputm >> 63) &&
  86                cpu_timer_interrupts_enabled(vcpu);
  87 }
  88
  89 static inline int is_ioirq(unsigned long irq_type)
  90 {
  91         return ((irq_type >= IRQ_PEND_IO_ISC_0) &&
  92                 (irq_type <= IRQ_PEND_IO_ISC_7));
  93 }
  94
  95 static uint64_t isc_to_isc_bits(int isc)
  96 {
  97         return (0x80 >> isc) << 24;
  98 }
  99
 100 static inline u8 int_word_to_isc(u32 int_word)
 101 {
 102         return (int_word & 0x38000000) >> 27;
 103 }
 104
 105 static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
 106 {
 107         return vcpu->kvm->arch.float_int.pending_irqs |
 108                vcpu->arch.local_int.pending_irqs;
 109 }
 110
 111 static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
 112                                    unsigned long active_mask)
 113 {
 114         int i;
 115
 116         for (i = 0; i <= MAX_ISC; i++)
 117                 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
 118                         active_mask &= ~(1UL << (IRQ_PEND_IO_ISC_0 + i));
 119
 120         return active_mask;
 121 }
 122
 123 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
 124 {
 125         unsigned long active_mask;
 126
 127         active_mask = pending_irqs(vcpu);
 128         if (!active_mask)
 129                 return 0;
 130
 131         if (psw_extint_disabled(vcpu))
 132                 active_mask &= ~IRQ_PEND_EXT_MASK;
 133         if (psw_ioint_disabled(vcpu))
 134                 active_mask &= ~IRQ_PEND_IO_MASK;
 135         else
 136                 active_mask = disable_iscs(vcpu, active_mask);
 137         if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
 138                 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
 139         if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
 140                 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
 141         if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
 142                 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
 143         if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
 144                 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
 145         if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
 146                 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
 147         if (psw_mchk_disabled(vcpu))
 148                 active_mask &= ~IRQ_PEND_MCHK_MASK;
 149         if (!(vcpu->arch.sie_block->gcr[14] &
 150               vcpu->kvm->arch.float_int.mchk.cr14))
 151                 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
 152
 153         /*
 154          * STOP irqs will never be actively delivered. They are triggered via
 155          * intercept requests and cleared when the stop intercept is performed.
 156          */
 157         __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
 158
 159         return active_mask;
 160 }
 161
 162 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
 163 {
 164         atomic_or(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 165         set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 166 }
 167
 168 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
 169 {
 170         atomic_andnot(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 171         clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 172 }
 173
 174 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
 175 {
 176         atomic_andnot(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
 177                     &vcpu->arch.sie_block->cpuflags);
 178         vcpu->arch.sie_block->lctl = 0x0000;
 179         vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
 180
 181         if (guestdbg_enabled(vcpu)) {
 182                 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
 183                                                LCTL_CR10 | LCTL_CR11);
 184                 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
 185         }
 186 }
 187
 188 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
 189 {
 190         atomic_or(flag, &vcpu->arch.sie_block->cpuflags);
 191 }
 192
 193 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
 194 {
 195         if (!(pending_irqs(vcpu) & IRQ_PEND_IO_MASK))
 196                 return;
 197         else if (psw_ioint_disabled(vcpu))
 198                 __set_cpuflag(vcpu, CPUSTAT_IO_INT);
 199         else
 200                 vcpu->arch.sie_block->lctl |= LCTL_CR6;
 201 }
 202
 203 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
 204 {
 205         if (!(pending_irqs(vcpu) & IRQ_PEND_EXT_MASK))
 206                 return;
 207         if (psw_extint_disabled(vcpu))
 208                 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
 209         else
 210                 vcpu->arch.sie_block->lctl |= LCTL_CR0;
 211 }
 212
 213 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
 214 {
 215         if (!(pending_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
 216                 return;
 217         if (psw_mchk_disabled(vcpu))
 218                 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
 219         else
 220                 vcpu->arch.sie_block->lctl |= LCTL_CR14;
 221 }
 222
 223 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
 224 {
 225         if (kvm_s390_is_stop_irq_pending(vcpu))
 226                 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
 227 }
 228
 229 /* Set interception request for non-deliverable interrupts */
 230 static void set_intercept_indicators(struct kvm_vcpu *vcpu)
 231 {
 232         set_intercept_indicators_io(vcpu);
 233         set_intercept_indicators_ext(vcpu);
 234         set_intercept_indicators_mchk(vcpu);
 235         set_intercept_indicators_stop(vcpu);
 236 }
 237
 238 static u16 get_ilc(struct kvm_vcpu *vcpu)
 239 {
 240         switch (vcpu->arch.sie_block->icptcode) {
 241         case ICPT_INST:
 242         case ICPT_INSTPROGI:
 243         case ICPT_OPEREXC:
 244         case ICPT_PARTEXEC:
 245         case ICPT_IOINST:
 246                 /* last instruction only stored for these icptcodes */
 247                 return insn_length(vcpu->arch.sie_block->ipa >> 8);
 248         case ICPT_PROGI:
 249                 return vcpu->arch.sie_block->pgmilc;
 250         default:
 251                 return 0;
 252         }
 253 }
 254
 255 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
 256 {
 257         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 258         int rc;
 259
 260         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
 261                                          0, 0);
 262
 263         rc  = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
 264                            (u16 *)__LC_EXT_INT_CODE);
 265         rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 266         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 267                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 268         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 269                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 270         clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
 271         return rc ? -EFAULT : 0;
 272 }
 273
 274 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
 275 {
 276         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 277         int rc;
 278
 279         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
 280                                          0, 0);
 281
 282         rc  = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
 283                            (u16 __user *)__LC_EXT_INT_CODE);
 284         rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 285         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 286                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 287         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 288                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 289         clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
 290         return rc ? -EFAULT : 0;
 291 }
 292
 293 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
 294 {
 295         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 296         struct kvm_s390_ext_info ext;
 297         int rc;
 298
 299         spin_lock(&li->lock);
 300         ext = li->irq.ext;
 301         clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
 302         li->irq.ext.ext_params2 = 0;
 303         spin_unlock(&li->lock);
 304
 305         VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
 306                    ext.ext_params2);
 307         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 308                                          KVM_S390_INT_PFAULT_INIT,
 309                                          0, ext.ext_params2);
 310
 311         rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
 312         rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
 313         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 314                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 315         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 316                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 317         rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
 318         return rc ? -EFAULT : 0;
 319 }
 320
 321 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
 322 {
 323         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 324         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 325         struct kvm_s390_mchk_info mchk = {};
 326         unsigned long adtl_status_addr;
 327         int deliver = 0;
 328         int rc = 0;
 329
 330         spin_lock(&fi->lock);
 331         spin_lock(&li->lock);
 332         if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
 333             test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
 334                 /*
 335                  * If there was an exigent machine check pending, then any
 336                  * repressible machine checks that might have been pending
 337                  * are indicated along with it, so always clear bits for
 338                  * repressible and exigent interrupts
 339                  */
 340                 mchk = li->irq.mchk;
 341                 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
 342                 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
 343                 memset(&li->irq.mchk, 0, sizeof(mchk));
 344                 deliver = 1;
 345         }
 346         /*
 347          * We indicate floating repressible conditions along with
 348          * other pending conditions. Channel Report Pending and Channel
 349          * Subsystem damage are the only two and and are indicated by
 350          * bits in mcic and masked in cr14.
 351          */
 352         if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
 353                 mchk.mcic |= fi->mchk.mcic;
 354                 mchk.cr14 |= fi->mchk.cr14;
 355                 memset(&fi->mchk, 0, sizeof(mchk));
 356                 deliver = 1;
 357         }
 358         spin_unlock(&li->lock);
 359         spin_unlock(&fi->lock);
 360
 361         if (deliver) {
 362                 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
 363                            mchk.mcic);
 364                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 365                                                  KVM_S390_MCHK,
 366                                                  mchk.cr14, mchk.mcic);
 367
 368                 rc  = kvm_s390_vcpu_store_status(vcpu,
 369                                                  KVM_S390_STORE_STATUS_PREFIXED);
 370                 rc |= read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR,
 371                                     &adtl_status_addr,
 372                                     sizeof(unsigned long));
 373                 rc |= kvm_s390_vcpu_store_adtl_status(vcpu,
 374                                                       adtl_status_addr);
 375                 rc |= put_guest_lc(vcpu, mchk.mcic,
 376                                    (u64 __user *) __LC_MCCK_CODE);
 377                 rc |= put_guest_lc(vcpu, mchk.failing_storage_address,
 378                                    (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
 379                 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA,
 380                                      &mchk.fixed_logout,
 381                                      sizeof(mchk.fixed_logout));
 382                 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
 383                                      &vcpu->arch.sie_block->gpsw,
 384                                      sizeof(psw_t));
 385                 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
 386                                     &vcpu->arch.sie_block->gpsw,
 387                                     sizeof(psw_t));
 388         }
 389         return rc ? -EFAULT : 0;
 390 }
 391
 392 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
 393 {
 394         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 395         int rc;
 396
 397         VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
 398         vcpu->stat.deliver_restart_signal++;
 399         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
 400
 401         rc  = write_guest_lc(vcpu,
 402                              offsetof(struct _lowcore, restart_old_psw),
 403                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 404         rc |= read_guest_lc(vcpu, offsetof(struct _lowcore, restart_psw),
 405                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 406         clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
 407         return rc ? -EFAULT : 0;
 408 }
 409
 410 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
 411 {
 412         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 413         struct kvm_s390_prefix_info prefix;
 414
 415         spin_lock(&li->lock);
 416         prefix = li->irq.prefix;
 417         li->irq.prefix.address = 0;
 418         clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
 419         spin_unlock(&li->lock);
 420
 421         vcpu->stat.deliver_prefix_signal++;
 422         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 423                                          KVM_S390_SIGP_SET_PREFIX,
 424                                          prefix.address, 0);
 425
 426         kvm_s390_set_prefix(vcpu, prefix.address);
 427         return 0;
 428 }
 429
 430 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
 431 {
 432         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 433         int rc;
 434         int cpu_addr;
 435
 436         spin_lock(&li->lock);
 437         cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
 438         clear_bit(cpu_addr, li->sigp_emerg_pending);
 439         if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
 440                 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
 441         spin_unlock(&li->lock);
 442
 443         VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
 444         vcpu->stat.deliver_emergency_signal++;
 445         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
 446                                          cpu_addr, 0);
 447
 448         rc  = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
 449                            (u16 *)__LC_EXT_INT_CODE);
 450         rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
 451         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 452                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 453         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 454                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 455         return rc ? -EFAULT : 0;
 456 }
 457
 458 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
 459 {
 460         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 461         struct kvm_s390_extcall_info extcall;
 462         int rc;
 463
 464         spin_lock(&li->lock);
 465         extcall = li->irq.extcall;
 466         li->irq.extcall.code = 0;
 467         clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
 468         spin_unlock(&li->lock);
 469
 470         VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
 471         vcpu->stat.deliver_external_call++;
 472         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 473                                          KVM_S390_INT_EXTERNAL_CALL,
 474                                          extcall.code, 0);
 475
 476         rc  = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
 477                            (u16 *)__LC_EXT_INT_CODE);
 478         rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
 479         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 480                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 481         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
 482                             sizeof(psw_t));
 483         return rc ? -EFAULT : 0;
 484 }
 485
 486 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
 487 {
 488         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 489         struct kvm_s390_pgm_info pgm_info;
 490         int rc = 0, nullifying = false;
 491         u16 ilc = get_ilc(vcpu);
 492
 493         spin_lock(&li->lock);
 494         pgm_info = li->irq.pgm;
 495         clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
 496         memset(&li->irq.pgm, 0, sizeof(pgm_info));
 497         spin_unlock(&li->lock);
 498
 499         VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilc:%d",
 500                    pgm_info.code, ilc);
 501         vcpu->stat.deliver_program_int++;
 502         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
 503                                          pgm_info.code, 0);
 504
 505         switch (pgm_info.code & ~PGM_PER) {
 506         case PGM_AFX_TRANSLATION:
 507         case PGM_ASX_TRANSLATION:
 508         case PGM_EX_TRANSLATION:
 509         case PGM_LFX_TRANSLATION:
 510         case PGM_LSTE_SEQUENCE:
 511         case PGM_LSX_TRANSLATION:
 512         case PGM_LX_TRANSLATION:
 513         case PGM_PRIMARY_AUTHORITY:
 514         case PGM_SECONDARY_AUTHORITY:
 515                 nullifying = true;
 516                 /* fall through */
 517         case PGM_SPACE_SWITCH:
 518                 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
 519                                   (u64 *)__LC_TRANS_EXC_CODE);
 520                 break;
 521         case PGM_ALEN_TRANSLATION:
 522         case PGM_ALE_SEQUENCE:
 523         case PGM_ASTE_INSTANCE:
 524         case PGM_ASTE_SEQUENCE:
 525         case PGM_ASTE_VALIDITY:
 526         case PGM_EXTENDED_AUTHORITY:
 527                 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
 528                                   (u8 *)__LC_EXC_ACCESS_ID);
 529                 nullifying = true;
 530                 break;
 531         case PGM_ASCE_TYPE:
 532         case PGM_PAGE_TRANSLATION:
 533         case PGM_REGION_FIRST_TRANS:
 534         case PGM_REGION_SECOND_TRANS:
 535         case PGM_REGION_THIRD_TRANS:
 536         case PGM_SEGMENT_TRANSLATION:
 537                 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
 538                                   (u64 *)__LC_TRANS_EXC_CODE);
 539                 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
 540                                    (u8 *)__LC_EXC_ACCESS_ID);
 541                 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
 542                                    (u8 *)__LC_OP_ACCESS_ID);
 543                 nullifying = true;
 544                 break;
 545         case PGM_MONITOR:
 546                 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
 547                                   (u16 *)__LC_MON_CLASS_NR);
 548                 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
 549                                    (u64 *)__LC_MON_CODE);
 550                 break;
 551         case PGM_VECTOR_PROCESSING:
 552         case PGM_DATA:
 553                 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
 554                                   (u32 *)__LC_DATA_EXC_CODE);
 555                 break;
 556         case PGM_PROTECTION:
 557                 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
 558                                   (u64 *)__LC_TRANS_EXC_CODE);
 559                 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
 560                                    (u8 *)__LC_EXC_ACCESS_ID);
 561                 break;
 562         case PGM_STACK_FULL:
 563         case PGM_STACK_EMPTY:
 564         case PGM_STACK_SPECIFICATION:
 565         case PGM_STACK_TYPE:
 566         case PGM_STACK_OPERATION:
 567         case PGM_TRACE_TABEL:
 568         case PGM_CRYPTO_OPERATION:
 569                 nullifying = true;
 570                 break;
 571         }
 572
 573         if (pgm_info.code & PGM_PER) {
 574                 rc |= put_guest_lc(vcpu, pgm_info.per_code,
 575                                    (u8 *) __LC_PER_CODE);
 576                 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
 577                                    (u8 *)__LC_PER_ATMID);
 578                 rc |= put_guest_lc(vcpu, pgm_info.per_address,
 579                                    (u64 *) __LC_PER_ADDRESS);
 580                 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
 581                                    (u8 *) __LC_PER_ACCESS_ID);
 582         }
 583
 584         if (nullifying && vcpu->arch.sie_block->icptcode == ICPT_INST)
 585                 kvm_s390_rewind_psw(vcpu, ilc);
 586
 587         rc |= put_guest_lc(vcpu, ilc, (u16 *) __LC_PGM_ILC);
 588         rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
 589                                  (u64 *) __LC_LAST_BREAK);
 590         rc |= put_guest_lc(vcpu, pgm_info.code,
 591                            (u16 *)__LC_PGM_INT_CODE);
 592         rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
 593                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 594         rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
 595                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 596         return rc ? -EFAULT : 0;
 597 }
 598
 599 static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
 600 {
 601         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 602         struct kvm_s390_ext_info ext;
 603         int rc = 0;
 604
 605         spin_lock(&fi->lock);
 606         if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
 607                 spin_unlock(&fi->lock);
 608                 return 0;
 609         }
 610         ext = fi->srv_signal;
 611         memset(&fi->srv_signal, 0, sizeof(ext));
 612         clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
 613         spin_unlock(&fi->lock);
 614
 615         VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
 616                    ext.ext_params);
 617         vcpu->stat.deliver_service_signal++;
 618         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
 619                                          ext.ext_params, 0);
 620
 621         rc  = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
 622         rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 623         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 624                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 625         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 626                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 627         rc |= put_guest_lc(vcpu, ext.ext_params,
 628                            (u32 *)__LC_EXT_PARAMS);
 629
 630         return rc ? -EFAULT : 0;
 631 }
 632
 633 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
 634 {
 635         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 636         struct kvm_s390_interrupt_info *inti;
 637         int rc = 0;
 638
 639         spin_lock(&fi->lock);
 640         inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
 641                                         struct kvm_s390_interrupt_info,
 642                                         list);
 643         if (inti) {
 644                 list_del(&inti->list);
 645                 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
 646         }
 647         if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
 648                 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
 649         spin_unlock(&fi->lock);
 650
 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                 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
 656                            inti->ext.ext_params2);
 657
 658                 rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
 659                                 (u16 *)__LC_EXT_INT_CODE);
 660                 rc |= put_guest_lc(vcpu, PFAULT_DONE,
 661                                 (u16 *)__LC_EXT_CPU_ADDR);
 662                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 663                                 &vcpu->arch.sie_block->gpsw,
 664                                 sizeof(psw_t));
 665                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 666                                 &vcpu->arch.sie_block->gpsw,
 667                                 sizeof(psw_t));
 668                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 669                                 (u64 *)__LC_EXT_PARAMS2);
 670                 kfree(inti);
 671         }
 672         return rc ? -EFAULT : 0;
 673 }
 674
 675 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
 676 {
 677         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 678         struct kvm_s390_interrupt_info *inti;
 679         int rc = 0;
 680
 681         spin_lock(&fi->lock);
 682         inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
 683                                         struct kvm_s390_interrupt_info,
 684                                         list);
 685         if (inti) {
 686                 VCPU_EVENT(vcpu, 4,
 687                            "deliver: virtio parm: 0x%x,parm64: 0x%llx",
 688                            inti->ext.ext_params, inti->ext.ext_params2);
 689                 vcpu->stat.deliver_virtio_interrupt++;
 690                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 691                                 inti->type,
 692                                 inti->ext.ext_params,
 693                                 inti->ext.ext_params2);
 694                 list_del(&inti->list);
 695                 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
 696         }
 697         if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
 698                 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
 699         spin_unlock(&fi->lock);
 700
 701         if (inti) {
 702                 rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
 703                                 (u16 *)__LC_EXT_INT_CODE);
 704                 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
 705                                 (u16 *)__LC_EXT_CPU_ADDR);
 706                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 707                                 &vcpu->arch.sie_block->gpsw,
 708                                 sizeof(psw_t));
 709                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 710                                 &vcpu->arch.sie_block->gpsw,
 711                                 sizeof(psw_t));
 712                 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
 713                                 (u32 *)__LC_EXT_PARAMS);
 714                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 715                                 (u64 *)__LC_EXT_PARAMS2);
 716                 kfree(inti);
 717         }
 718         return rc ? -EFAULT : 0;
 719 }
 720
 721 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
 722                                      unsigned long irq_type)
 723 {
 724         struct list_head *isc_list;
 725         struct kvm_s390_float_interrupt *fi;
 726         struct kvm_s390_interrupt_info *inti = NULL;
 727         int rc = 0;
 728
 729         fi = &vcpu->kvm->arch.float_int;
 730
 731         spin_lock(&fi->lock);
 732         isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0];
 733         inti = list_first_entry_or_null(isc_list,
 734                                         struct kvm_s390_interrupt_info,
 735                                         list);
 736         if (inti) {
 737                 VCPU_EVENT(vcpu, 4, "deliver: I/O 0x%llx", inti->type);
 738                 vcpu->stat.deliver_io_int++;
 739                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 740                                 inti->type,
 741                                 ((__u32)inti->io.subchannel_id << 16) |
 742                                 inti->io.subchannel_nr,
 743                                 ((__u64)inti->io.io_int_parm << 32) |
 744                                 inti->io.io_int_word);
 745                 list_del(&inti->list);
 746                 fi->counters[FIRQ_CNTR_IO] -= 1;
 747         }
 748         if (list_empty(isc_list))
 749                 clear_bit(irq_type, &fi->pending_irqs);
 750         spin_unlock(&fi->lock);
 751
 752         if (inti) {
 753                 rc  = put_guest_lc(vcpu, inti->io.subchannel_id,
 754                                 (u16 *)__LC_SUBCHANNEL_ID);
 755                 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
 756                                 (u16 *)__LC_SUBCHANNEL_NR);
 757                 rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
 758                                 (u32 *)__LC_IO_INT_PARM);
 759                 rc |= put_guest_lc(vcpu, inti->io.io_int_word,
 760                                 (u32 *)__LC_IO_INT_WORD);
 761                 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
 762                                 &vcpu->arch.sie_block->gpsw,
 763                                 sizeof(psw_t));
 764                 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
 765                                 &vcpu->arch.sie_block->gpsw,
 766                                 sizeof(psw_t));
 767                 kfree(inti);
 768         }
 769
 770         return rc ? -EFAULT : 0;
 771 }
 772
 773 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);
 774
 775 static const deliver_irq_t deliver_irq_funcs[] = {
 776         [IRQ_PEND_MCHK_EX]        = __deliver_machine_check,
 777         [IRQ_PEND_MCHK_REP]       = __deliver_machine_check,
 778         [IRQ_PEND_PROG]           = __deliver_prog,
 779         [IRQ_PEND_EXT_EMERGENCY]  = __deliver_emergency_signal,
 780         [IRQ_PEND_EXT_EXTERNAL]   = __deliver_external_call,
 781         [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc,
 782         [IRQ_PEND_EXT_CPU_TIMER]  = __deliver_cpu_timer,
 783         [IRQ_PEND_RESTART]        = __deliver_restart,
 784         [IRQ_PEND_SET_PREFIX]     = __deliver_set_prefix,
 785         [IRQ_PEND_PFAULT_INIT]    = __deliver_pfault_init,
 786         [IRQ_PEND_EXT_SERVICE]    = __deliver_service,
 787         [IRQ_PEND_PFAULT_DONE]    = __deliver_pfault_done,
 788         [IRQ_PEND_VIRTIO]         = __deliver_virtio,
 789 };
 790
 791 /* Check whether an external call is pending (deliverable or not) */
 792 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
 793 {
 794         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 795         uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
 796
 797         if (!sclp.has_sigpif)
 798                 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
 799
 800         return (sigp_ctrl & SIGP_CTRL_C) &&
 801                (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND);
 802 }
 803
 804 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
 805 {
 806         if (deliverable_irqs(vcpu))
 807                 return 1;
 808
 809         if (kvm_cpu_has_pending_timer(vcpu))
 810                 return 1;
 811
 812         /* external call pending and deliverable */
 813         if (kvm_s390_ext_call_pending(vcpu) &&
 814             !psw_extint_disabled(vcpu) &&
 815             (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
 816                 return 1;
 817
 818         if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
 819                 return 1;
 820         return 0;
 821 }
 822
 823 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 824 {
 825         return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
 826 }
 827
 828 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
 829 {
 830         u64 now, sltime;
 831
 832         vcpu->stat.exit_wait_state++;
 833
 834         /* fast path */
 835         if (kvm_arch_vcpu_runnable(vcpu))
 836                 return 0;
 837
 838         if (psw_interrupts_disabled(vcpu)) {
 839                 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
 840                 return -EOPNOTSUPP; /* disabled wait */
 841         }
 842
 843         if (!ckc_interrupts_enabled(vcpu)) {
 844                 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
 845                 __set_cpu_idle(vcpu);
 846                 goto no_timer;
 847         }
 848
 849         now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
 850         sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
 851
 852         /* underflow */
 853         if (vcpu->arch.sie_block->ckc < now)
 854                 return 0;
 855
 856         __set_cpu_idle(vcpu);
 857         hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
 858         VCPU_EVENT(vcpu, 4, "enabled wait via clock comparator: %llu ns", sltime);
 859 no_timer:
 860         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
 861         kvm_vcpu_block(vcpu);
 862         __unset_cpu_idle(vcpu);
 863         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
 864
 865         hrtimer_cancel(&vcpu->arch.ckc_timer);
 866         return 0;
 867 }
 868
 869 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
 870 {
 871         if (swait_active(&vcpu->wq)) {
 872                 /*
 873                  * The vcpu gave up the cpu voluntarily, mark it as a good
 874                  * yield-candidate.
 875                  */
 876                 vcpu->preempted = true;
 877                 swake_up(&vcpu->wq);
 878                 vcpu->stat.halt_wakeup++;
 879         }
 880 }
 881
 882 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
 883 {
 884         struct kvm_vcpu *vcpu;
 885         u64 now, sltime;
 886
 887         vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
 888         now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
 889         sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
 890
 891         /*
 892          * If the monotonic clock runs faster than the tod clock we might be
 893          * woken up too early and have to go back to sleep to avoid deadlocks.
 894          */
 895         if (vcpu->arch.sie_block->ckc > now &&
 896             hrtimer_forward_now(timer, ns_to_ktime(sltime)))
 897                 return HRTIMER_RESTART;
 898         kvm_s390_vcpu_wakeup(vcpu);
 899         return HRTIMER_NORESTART;
 900 }
 901
 902 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
 903 {
 904         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 905
 906         spin_lock(&li->lock);
 907         li->pending_irqs = 0;
 908         bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
 909         memset(&li->irq, 0, sizeof(li->irq));
 910         spin_unlock(&li->lock);
 911
 912         /* clear pending external calls set by sigp interpretation facility */
 913         atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags);
 914         vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl = 0;
 915 }
 916
 917 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
 918 {
 919         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 920         deliver_irq_t func;
 921         int rc = 0;
 922         unsigned long irq_type;
 923         unsigned long irqs;
 924
 925         __reset_intercept_indicators(vcpu);
 926
 927         /* pending ckc conditions might have been invalidated */
 928         clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
 929         if (ckc_irq_pending(vcpu))
 930                 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
 931
 932         /* pending cpu timer conditions might have been invalidated */
 933         clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
 934         if (cpu_timer_irq_pending(vcpu))
 935                 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
 936
 937         while ((irqs = deliverable_irqs(vcpu)) && !rc) {
 938                 /* bits are in the order of interrupt priority */
 939                 irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT);
 940                 if (is_ioirq(irq_type)) {
 941                         rc = __deliver_io(vcpu, irq_type);
 942                 } else {
 943                         func = deliver_irq_funcs[irq_type];
 944                         if (!func) {
 945                                 WARN_ON_ONCE(func == NULL);
 946                                 clear_bit(irq_type, &li->pending_irqs);
 947                                 continue;
 948                         }
 949                         rc = func(vcpu);
 950                 }
 951         }
 952
 953         set_intercept_indicators(vcpu);
 954
 955         return rc;
 956 }
 957
 958 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
 959 {
 960         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 961
 962         VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
 963         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
 964                                    irq->u.pgm.code, 0);
 965
 966         if (irq->u.pgm.code == PGM_PER) {
 967                 li->irq.pgm.code |= PGM_PER;
 968                 /* only modify PER related information */
 969                 li->irq.pgm.per_address = irq->u.pgm.per_address;
 970                 li->irq.pgm.per_code = irq->u.pgm.per_code;
 971                 li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
 972                 li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
 973         } else if (!(irq->u.pgm.code & PGM_PER)) {
 974                 li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
 975                                    irq->u.pgm.code;
 976                 /* only modify non-PER information */
 977                 li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
 978                 li->irq.pgm.mon_code = irq->u.pgm.mon_code;
 979                 li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
 980                 li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
 981                 li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
 982                 li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
 983         } else {
 984                 li->irq.pgm = irq->u.pgm;
 985         }
 986         set_bit(IRQ_PEND_PROG, &li->pending_irqs);
 987         return 0;
 988 }
 989
 990 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
 991 {
 992         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 993
 994         VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
 995                    irq->u.ext.ext_params2);
 996         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
 997                                    irq->u.ext.ext_params,
 998                                    irq->u.ext.ext_params2);
 999
1000         li->irq.ext = irq->u.ext;
1001         set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1002         atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1003         return 0;
1004 }
1005
1006 static int __inject_extcall_sigpif(struct kvm_vcpu *vcpu, uint16_t src_id)
1007 {
1008         unsigned char new_val, old_val;
1009         uint8_t *sigp_ctrl = &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
1010
1011         new_val = SIGP_CTRL_C | (src_id & SIGP_CTRL_SCN_MASK);
1012         old_val = *sigp_ctrl & ~SIGP_CTRL_C;
1013         if (cmpxchg(sigp_ctrl, old_val, new_val) != old_val) {
1014                 /* another external call is pending */
1015                 return -EBUSY;
1016         }
1017         atomic_or(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
1018         return 0;
1019 }
1020
1021 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1022 {
1023         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1024         struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1025         uint16_t src_id = irq->u.extcall.code;
1026
1027         VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1028                    src_id);
1029         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1030                                    src_id, 0);
1031
1032         /* sending vcpu invalid */
1033         if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
1034                 return -EINVAL;
1035
1036         if (sclp.has_sigpif)
1037                 return __inject_extcall_sigpif(vcpu, src_id);
1038
1039         if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1040                 return -EBUSY;
1041         *extcall = irq->u.extcall;
1042         atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1043         return 0;
1044 }
1045
1046 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1047 {
1048         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1049         struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1050
1051         VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1052                    irq->u.prefix.address);
1053         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1054                                    irq->u.prefix.address, 0);
1055
1056         if (!is_vcpu_stopped(vcpu))
1057                 return -EBUSY;
1058
1059         *prefix = irq->u.prefix;
1060         set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1061         return 0;
1062 }
1063
1064 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1065 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1066 {
1067         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1068         struct kvm_s390_stop_info *stop = &li->irq.stop;
1069         int rc = 0;
1070
1071         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1072
1073         if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1074                 return -EINVAL;
1075
1076         if (is_vcpu_stopped(vcpu)) {
1077                 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1078                         rc = kvm_s390_store_status_unloaded(vcpu,
1079                                                 KVM_S390_STORE_STATUS_NOADDR);
1080                 return rc;
1081         }
1082
1083         if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1084                 return -EBUSY;
1085         stop->flags = irq->u.stop.flags;
1086         __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
1087         return 0;
1088 }
1089
1090 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1091                                  struct kvm_s390_irq *irq)
1092 {
1093         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1094
1095         VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1096         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1097
1098         set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1099         return 0;
1100 }
1101
1102 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1103                                    struct kvm_s390_irq *irq)
1104 {
1105         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1106
1107         VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1108                    irq->u.emerg.code);
1109         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1110                                    irq->u.emerg.code, 0);
1111
1112         /* sending vcpu invalid */
1113         if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
1114                 return -EINVAL;
1115
1116         set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1117         set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1118         atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1119         return 0;
1120 }
1121
1122 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1123 {
1124         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1125         struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1126
1127         VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1128                    irq->u.mchk.mcic);
1129         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1130                                    irq->u.mchk.mcic);
1131
1132         /*
1133          * Because repressible machine checks can be indicated along with
1134          * exigent machine checks (PoP, Chapter 11, Interruption action)
1135          * we need to combine cr14, mcic and external damage code.
1136          * Failing storage address and the logout area should not be or'ed
1137          * together, we just indicate the last occurrence of the corresponding
1138          * machine check
1139          */
1140         mchk->cr14 |= irq->u.mchk.cr14;
1141         mchk->mcic |= irq->u.mchk.mcic;
1142         mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1143         mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1144         memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1145                sizeof(mchk->fixed_logout));
1146         if (mchk->mcic & MCHK_EX_MASK)
1147                 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1148         else if (mchk->mcic & MCHK_REP_MASK)
1149                 set_bit(IRQ_PEND_MCHK_REP,  &li->pending_irqs);
1150         return 0;
1151 }
1152
1153 static int __inject_ckc(struct kvm_vcpu *vcpu)
1154 {
1155         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1156
1157         VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1158         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1159                                    0, 0);
1160
1161         set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1162         atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1163         return 0;
1164 }
1165
1166 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1167 {
1168         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1169
1170         VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1171         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1172                                    0, 0);
1173
1174         set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1175         atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1176         return 0;
1177 }
1178
1179 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1180                                                   int isc, u32 schid)
1181 {
1182         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1183         struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1184         struct kvm_s390_interrupt_info *iter;
1185         u16 id = (schid & 0xffff0000U) >> 16;
1186         u16 nr = schid & 0x0000ffffU;
1187
1188         spin_lock(&fi->lock);
1189         list_for_each_entry(iter, isc_list, list) {
1190                 if (schid && (id != iter->io.subchannel_id ||
1191                               nr != iter->io.subchannel_nr))
1192                         continue;
1193                 /* found an appropriate entry */
1194                 list_del_init(&iter->list);
1195                 fi->counters[FIRQ_CNTR_IO] -= 1;
1196                 if (list_empty(isc_list))
1197                         clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1198                 spin_unlock(&fi->lock);
1199                 return iter;
1200         }
1201         spin_unlock(&fi->lock);
1202         return NULL;
1203 }
1204
1205 /*
1206  * Dequeue and return an I/O interrupt matching any of the interruption
1207  * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1208  */
1209 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1210                                                     u64 isc_mask, u32 schid)
1211 {
1212         struct kvm_s390_interrupt_info *inti = NULL;
1213         int isc;
1214
1215         for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1216                 if (isc_mask & isc_to_isc_bits(isc))
1217                         inti = get_io_int(kvm, isc, schid);
1218         }
1219         return inti;
1220 }
1221
1222 #define SCCB_MASK 0xFFFFFFF8
1223 #define SCCB_EVENT_PENDING 0x3
1224
1225 static int __inject_service(struct kvm *kvm,
1226                              struct kvm_s390_interrupt_info *inti)
1227 {
1228         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1229
1230         spin_lock(&fi->lock);
1231         fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1232         /*
1233          * Early versions of the QEMU s390 bios will inject several
1234          * service interrupts after another without handling a
1235          * condition code indicating busy.
1236          * We will silently ignore those superfluous sccb values.
1237          * A future version of QEMU will take care of serialization
1238          * of servc requests
1239          */
1240         if (fi->srv_signal.ext_params & SCCB_MASK)
1241                 goto out;
1242         fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1243         set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1244 out:
1245         spin_unlock(&fi->lock);
1246         kfree(inti);
1247         return 0;
1248 }
1249
1250 static int __inject_virtio(struct kvm *kvm,
1251                             struct kvm_s390_interrupt_info *inti)
1252 {
1253         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1254
1255         spin_lock(&fi->lock);
1256         if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1257                 spin_unlock(&fi->lock);
1258                 return -EBUSY;
1259         }
1260         fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1261         list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1262         set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1263         spin_unlock(&fi->lock);
1264         return 0;
1265 }
1266
1267 static int __inject_pfault_done(struct kvm *kvm,
1268                                  struct kvm_s390_interrupt_info *inti)
1269 {
1270         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1271
1272         spin_lock(&fi->lock);
1273         if (fi->counters[FIRQ_CNTR_PFAULT] >=
1274                 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1275                 spin_unlock(&fi->lock);
1276                 return -EBUSY;
1277         }
1278         fi->counters[FIRQ_CNTR_PFAULT] += 1;
1279         list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1280         set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1281         spin_unlock(&fi->lock);
1282         return 0;
1283 }
1284
1285 #define CR_PENDING_SUBCLASS 28
1286 static int __inject_float_mchk(struct kvm *kvm,
1287                                 struct kvm_s390_interrupt_info *inti)
1288 {
1289         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1290
1291         spin_lock(&fi->lock);
1292         fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1293         fi->mchk.mcic |= inti->mchk.mcic;
1294         set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1295         spin_unlock(&fi->lock);
1296         kfree(inti);
1297         return 0;
1298 }
1299
1300 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1301 {
1302         struct kvm_s390_float_interrupt *fi;
1303         struct list_head *list;
1304         int isc;
1305
1306         fi = &kvm->arch.float_int;
1307         spin_lock(&fi->lock);
1308         if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1309                 spin_unlock(&fi->lock);
1310                 return -EBUSY;
1311         }
1312         fi->counters[FIRQ_CNTR_IO] += 1;
1313
1314         isc = int_word_to_isc(inti->io.io_int_word);
1315         list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1316         list_add_tail(&inti->list, list);
1317         set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1318         spin_unlock(&fi->lock);
1319         return 0;
1320 }
1321
1322 /*
1323  * Find a destination VCPU for a floating irq and kick it.
1324  */
1325 static void __floating_irq_kick(struct kvm *kvm, u64 type)
1326 {
1327         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1328         struct kvm_s390_local_interrupt *li;
1329         struct kvm_vcpu *dst_vcpu;
1330         int sigcpu, online_vcpus, nr_tries = 0;
1331
1332         online_vcpus = atomic_read(&kvm->online_vcpus);
1333         if (!online_vcpus)
1334                 return;
1335
1336         /* find idle VCPUs first, then round robin */
1337         sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
1338         if (sigcpu == online_vcpus) {
1339                 do {
1340                         sigcpu = fi->next_rr_cpu;
1341                         fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
1342                         /* avoid endless loops if all vcpus are stopped */
1343                         if (nr_tries++ >= online_vcpus)
1344                                 return;
1345                 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1346         }
1347         dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1348
1349         /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1350         li = &dst_vcpu->arch.local_int;
1351         spin_lock(&li->lock);
1352         switch (type) {
1353         case KVM_S390_MCHK:
1354                 atomic_or(CPUSTAT_STOP_INT, li->cpuflags);
1355                 break;
1356         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1357                 atomic_or(CPUSTAT_IO_INT, li->cpuflags);
1358                 break;
1359         default:
1360                 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1361                 break;
1362         }
1363         spin_unlock(&li->lock);
1364         kvm_s390_vcpu_wakeup(dst_vcpu);
1365 }
1366
1367 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1368 {
1369         u64 type = READ_ONCE(inti->type);
1370         int rc;
1371
1372         switch (type) {
1373         case KVM_S390_MCHK:
1374                 rc = __inject_float_mchk(kvm, inti);
1375                 break;
1376         case KVM_S390_INT_VIRTIO:
1377                 rc = __inject_virtio(kvm, inti);
1378                 break;
1379         case KVM_S390_INT_SERVICE:
1380                 rc = __inject_service(kvm, inti);
1381                 break;
1382         case KVM_S390_INT_PFAULT_DONE:
1383                 rc = __inject_pfault_done(kvm, inti);
1384                 break;
1385         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1386                 rc = __inject_io(kvm, inti);
1387                 break;
1388         default:
1389                 rc = -EINVAL;
1390         }
1391         if (rc)
1392                 return rc;
1393
1394         __floating_irq_kick(kvm, type);
1395         return 0;
1396 }
1397
1398 int kvm_s390_inject_vm(struct kvm *kvm,
1399                        struct kvm_s390_interrupt *s390int)
1400 {
1401         struct kvm_s390_interrupt_info *inti;
1402         int rc;
1403
1404         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1405         if (!inti)
1406                 return -ENOMEM;
1407
1408         inti->type = s390int->type;
1409         switch (inti->type) {
1410         case KVM_S390_INT_VIRTIO:
1411                 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1412                          s390int->parm, s390int->parm64);
1413                 inti->ext.ext_params = s390int->parm;
1414                 inti->ext.ext_params2 = s390int->parm64;
1415                 break;
1416         case KVM_S390_INT_SERVICE:
1417                 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1418                 inti->ext.ext_params = s390int->parm;
1419                 break;
1420         case KVM_S390_INT_PFAULT_DONE:
1421                 inti->ext.ext_params2 = s390int->parm64;
1422                 break;
1423         case KVM_S390_MCHK:
1424                 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1425                          s390int->parm64);
1426                 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1427                 inti->mchk.mcic = s390int->parm64;
1428                 break;
1429         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1430                 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1431                         VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
1432                 else
1433                         VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
1434                                  s390int->type & IOINT_CSSID_MASK,
1435                                  s390int->type & IOINT_SSID_MASK,
1436                                  s390int->type & IOINT_SCHID_MASK);
1437                 inti->io.subchannel_id = s390int->parm >> 16;
1438                 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1439                 inti->io.io_int_parm = s390int->parm64 >> 32;
1440                 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1441                 break;
1442         default:
1443                 kfree(inti);
1444                 return -EINVAL;
1445         }
1446         trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1447                                  2);
1448
1449         rc = __inject_vm(kvm, inti);
1450         if (rc)
1451                 kfree(inti);
1452         return rc;
1453 }
1454
1455 int kvm_s390_reinject_io_int(struct kvm *kvm,
1456                               struct kvm_s390_interrupt_info *inti)
1457 {
1458         return __inject_vm(kvm, inti);
1459 }
1460
1461 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1462                        struct kvm_s390_irq *irq)
1463 {
1464         irq->type = s390int->type;
1465         switch (irq->type) {
1466         case KVM_S390_PROGRAM_INT:
1467                 if (s390int->parm & 0xffff0000)
1468                         return -EINVAL;
1469                 irq->u.pgm.code = s390int->parm;
1470                 break;
1471         case KVM_S390_SIGP_SET_PREFIX:
1472                 irq->u.prefix.address = s390int->parm;
1473                 break;
1474         case KVM_S390_SIGP_STOP:
1475                 irq->u.stop.flags = s390int->parm;
1476                 break;
1477         case KVM_S390_INT_EXTERNAL_CALL:
1478                 if (s390int->parm & 0xffff0000)
1479                         return -EINVAL;
1480                 irq->u.extcall.code = s390int->parm;
1481                 break;
1482         case KVM_S390_INT_EMERGENCY:
1483                 if (s390int->parm & 0xffff0000)
1484                         return -EINVAL;
1485                 irq->u.emerg.code = s390int->parm;
1486                 break;
1487         case KVM_S390_MCHK:
1488                 irq->u.mchk.mcic = s390int->parm64;
1489                 break;
1490         }
1491         return 0;
1492 }
1493
1494 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1495 {
1496         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1497
1498         return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1499 }
1500
1501 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1502 {
1503         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1504
1505         spin_lock(&li->lock);
1506         li->irq.stop.flags = 0;
1507         clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1508         spin_unlock(&li->lock);
1509 }
1510
1511 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1512 {
1513         int rc;
1514
1515         switch (irq->type) {
1516         case KVM_S390_PROGRAM_INT:
1517                 rc = __inject_prog(vcpu, irq);
1518                 break;
1519         case KVM_S390_SIGP_SET_PREFIX:
1520                 rc = __inject_set_prefix(vcpu, irq);
1521                 break;
1522         case KVM_S390_SIGP_STOP:
1523                 rc = __inject_sigp_stop(vcpu, irq);
1524                 break;
1525         case KVM_S390_RESTART:
1526                 rc = __inject_sigp_restart(vcpu, irq);
1527                 break;
1528         case KVM_S390_INT_CLOCK_COMP:
1529                 rc = __inject_ckc(vcpu);
1530                 break;
1531         case KVM_S390_INT_CPU_TIMER:
1532                 rc = __inject_cpu_timer(vcpu);
1533                 break;
1534         case KVM_S390_INT_EXTERNAL_CALL:
1535                 rc = __inject_extcall(vcpu, irq);
1536                 break;
1537         case KVM_S390_INT_EMERGENCY:
1538                 rc = __inject_sigp_emergency(vcpu, irq);
1539                 break;
1540         case KVM_S390_MCHK:
1541                 rc = __inject_mchk(vcpu, irq);
1542                 break;
1543         case KVM_S390_INT_PFAULT_INIT:
1544                 rc = __inject_pfault_init(vcpu, irq);
1545                 break;
1546         case KVM_S390_INT_VIRTIO:
1547         case KVM_S390_INT_SERVICE:
1548         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1549         default:
1550                 rc = -EINVAL;
1551         }
1552
1553         return rc;
1554 }
1555
1556 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1557 {
1558         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1559         int rc;
1560
1561         spin_lock(&li->lock);
1562         rc = do_inject_vcpu(vcpu, irq);
1563         spin_unlock(&li->lock);
1564         if (!rc)
1565                 kvm_s390_vcpu_wakeup(vcpu);
1566         return rc;
1567 }
1568
1569 static inline void clear_irq_list(struct list_head *_list)
1570 {
1571         struct kvm_s390_interrupt_info *inti, *n;
1572
1573         list_for_each_entry_safe(inti, n, _list, list) {
1574                 list_del(&inti->list);
1575                 kfree(inti);
1576         }
1577 }
1578
1579 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1580                        struct kvm_s390_irq *irq)
1581 {
1582         irq->type = inti->type;
1583         switch (inti->type) {
1584         case KVM_S390_INT_PFAULT_INIT:
1585         case KVM_S390_INT_PFAULT_DONE:
1586         case KVM_S390_INT_VIRTIO:
1587                 irq->u.ext = inti->ext;
1588                 break;
1589         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1590                 irq->u.io = inti->io;
1591                 break;
1592         }
1593 }
1594
1595 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1596 {
1597         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1598         int i;
1599
1600         spin_lock(&fi->lock);
1601         fi->pending_irqs = 0;
1602         memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
1603         memset(&fi->mchk, 0, sizeof(fi->mchk));
1604         for (i = 0; i < FIRQ_LIST_COUNT; i++)
1605                 clear_irq_list(&fi->lists[i]);
1606         for (i = 0; i < FIRQ_MAX_COUNT; i++)
1607                 fi->counters[i] = 0;
1608         spin_unlock(&fi->lock);
1609 };
1610
1611 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1612 {
1613         struct kvm_s390_interrupt_info *inti;
1614         struct kvm_s390_float_interrupt *fi;
1615         struct kvm_s390_irq *buf;
1616         struct kvm_s390_irq *irq;
1617         int max_irqs;
1618         int ret = 0;
1619         int n = 0;
1620         int i;
1621
1622         if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
1623                 return -EINVAL;
1624
1625         /*
1626          * We are already using -ENOMEM to signal
1627          * userspace it may retry with a bigger buffer,
1628          * so we need to use something else for this case
1629          */
1630         buf = vzalloc(len);
1631         if (!buf)
1632                 return -ENOBUFS;
1633
1634         max_irqs = len / sizeof(struct kvm_s390_irq);
1635
1636         fi = &kvm->arch.float_int;
1637         spin_lock(&fi->lock);
1638         for (i = 0; i < FIRQ_LIST_COUNT; i++) {
1639                 list_for_each_entry(inti, &fi->lists[i], list) {
1640                         if (n == max_irqs) {
1641                                 /* signal userspace to try again */
1642                                 ret = -ENOMEM;
1643                                 goto out;
1644                         }
1645                         inti_to_irq(inti, &buf[n]);
1646                         n++;
1647                 }
1648         }
1649         if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
1650                 if (n == max_irqs) {
1651                         /* signal userspace to try again */
1652                         ret = -ENOMEM;
1653                         goto out;
1654                 }
1655                 irq = (struct kvm_s390_irq *) &buf[n];
1656                 irq->type = KVM_S390_INT_SERVICE;
1657                 irq->u.ext = fi->srv_signal;
1658                 n++;
1659         }
1660         if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
1661                 if (n == max_irqs) {
1662                                 /* signal userspace to try again */
1663                                 ret = -ENOMEM;
1664                                 goto out;
1665                 }
1666                 irq = (struct kvm_s390_irq *) &buf[n];
1667                 irq->type = KVM_S390_MCHK;
1668                 irq->u.mchk = fi->mchk;
1669                 n++;
1670 }
1671
1672 out:
1673         spin_unlock(&fi->lock);
1674         if (!ret && n > 0) {
1675                 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
1676                         ret = -EFAULT;
1677         }
1678         vfree(buf);
1679
1680         return ret < 0 ? ret : n;
1681 }
1682
1683 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1684 {
1685         int r;
1686
1687         switch (attr->group) {
1688         case KVM_DEV_FLIC_GET_ALL_IRQS:
1689                 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
1690                                           attr->attr);
1691                 break;
1692         default:
1693                 r = -EINVAL;
1694         }
1695
1696         return r;
1697 }
1698
1699 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1700                                      u64 addr)
1701 {
1702         struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1703         void *target = NULL;
1704         void __user *source;
1705         u64 size;
1706
1707         if (get_user(inti->type, (u64 __user *)addr))
1708                 return -EFAULT;
1709
1710         switch (inti->type) {
1711         case KVM_S390_INT_PFAULT_INIT:
1712         case KVM_S390_INT_PFAULT_DONE:
1713         case KVM_S390_INT_VIRTIO:
1714         case KVM_S390_INT_SERVICE:
1715                 target = (void *) &inti->ext;
1716                 source = &uptr->u.ext;
1717                 size = sizeof(inti->ext);
1718                 break;
1719         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1720                 target = (void *) &inti->io;
1721                 source = &uptr->u.io;
1722                 size = sizeof(inti->io);
1723                 break;
1724         case KVM_S390_MCHK:
1725                 target = (void *) &inti->mchk;
1726                 source = &uptr->u.mchk;
1727                 size = sizeof(inti->mchk);
1728                 break;
1729         default:
1730                 return -EINVAL;
1731         }
1732
1733         if (copy_from_user(target, source, size))
1734                 return -EFAULT;
1735
1736         return 0;
1737 }
1738
1739 static int enqueue_floating_irq(struct kvm_device *dev,
1740                                 struct kvm_device_attr *attr)
1741 {
1742         struct kvm_s390_interrupt_info *inti = NULL;
1743         int r = 0;
1744         int len = attr->attr;
1745
1746         if (len % sizeof(struct kvm_s390_irq) != 0)
1747                 return -EINVAL;
1748         else if (len > KVM_S390_FLIC_MAX_BUFFER)
1749                 return -EINVAL;
1750
1751         while (len >= sizeof(struct kvm_s390_irq)) {
1752                 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1753                 if (!inti)
1754                         return -ENOMEM;
1755
1756                 r = copy_irq_from_user(inti, attr->addr);
1757                 if (r) {
1758                         kfree(inti);
1759                         return r;
1760                 }
1761                 r = __inject_vm(dev->kvm, inti);
1762                 if (r) {
1763                         kfree(inti);
1764                         return r;
1765                 }
1766                 len -= sizeof(struct kvm_s390_irq);
1767                 attr->addr += sizeof(struct kvm_s390_irq);
1768         }
1769
1770         return r;
1771 }
1772
1773 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1774 {
1775         if (id >= MAX_S390_IO_ADAPTERS)
1776                 return NULL;
1777         return kvm->arch.adapters[id];
1778 }
1779
1780 static int register_io_adapter(struct kvm_device *dev,
1781                                struct kvm_device_attr *attr)
1782 {
1783         struct s390_io_adapter *adapter;
1784         struct kvm_s390_io_adapter adapter_info;
1785
1786         if (copy_from_user(&adapter_info,
1787                            (void __user *)attr->addr, sizeof(adapter_info)))
1788                 return -EFAULT;
1789
1790         if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1791             (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1792                 return -EINVAL;
1793
1794         adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1795         if (!adapter)
1796                 return -ENOMEM;
1797
1798         INIT_LIST_HEAD(&adapter->maps);
1799         init_rwsem(&adapter->maps_lock);
1800         atomic_set(&adapter->nr_maps, 0);
1801         adapter->id = adapter_info.id;
1802         adapter->isc = adapter_info.isc;
1803         adapter->maskable = adapter_info.maskable;
1804         adapter->masked = false;
1805         adapter->swap = adapter_info.swap;
1806         dev->kvm->arch.adapters[adapter->id] = adapter;
1807
1808         return 0;
1809 }
1810
1811 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1812 {
1813         int ret;
1814         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1815
1816         if (!adapter || !adapter->maskable)
1817                 return -EINVAL;
1818         ret = adapter->masked;
1819         adapter->masked = masked;
1820         return ret;
1821 }
1822
1823 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1824 {
1825         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1826         struct s390_map_info *map;
1827         int ret;
1828
1829         if (!adapter || !addr)
1830                 return -EINVAL;
1831
1832         map = kzalloc(sizeof(*map), GFP_KERNEL);
1833         if (!map) {
1834                 ret = -ENOMEM;
1835                 goto out;
1836         }
1837         INIT_LIST_HEAD(&map->list);
1838         map->guest_addr = addr;
1839         map->addr = gmap_translate(kvm->arch.gmap, addr);
1840         if (map->addr == -EFAULT) {
1841                 ret = -EFAULT;
1842                 goto out;
1843         }
1844         ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1845         if (ret < 0)
1846                 goto out;
1847         BUG_ON(ret != 1);
1848         down_write(&adapter->maps_lock);
1849         if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1850                 list_add_tail(&map->list, &adapter->maps);
1851                 ret = 0;
1852         } else {
1853                 put_page(map->page);
1854                 ret = -EINVAL;
1855         }
1856         up_write(&adapter->maps_lock);
1857 out:
1858         if (ret)
1859                 kfree(map);
1860         return ret;
1861 }
1862
1863 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1864 {
1865         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1866         struct s390_map_info *map, *tmp;
1867         int found = 0;
1868
1869         if (!adapter || !addr)
1870                 return -EINVAL;
1871
1872         down_write(&adapter->maps_lock);
1873         list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1874                 if (map->guest_addr == addr) {
1875                         found = 1;
1876                         atomic_dec(&adapter->nr_maps);
1877                         list_del(&map->list);
1878                         put_page(map->page);
1879                         kfree(map);
1880                         break;
1881                 }
1882         }
1883         up_write(&adapter->maps_lock);
1884
1885         return found ? 0 : -EINVAL;
1886 }
1887
1888 void kvm_s390_destroy_adapters(struct kvm *kvm)
1889 {
1890         int i;
1891         struct s390_map_info *map, *tmp;
1892
1893         for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
1894                 if (!kvm->arch.adapters[i])
1895                         continue;
1896                 list_for_each_entry_safe(map, tmp,
1897                                          &kvm->arch.adapters[i]->maps, list) {
1898                         list_del(&map->list);
1899                         put_page(map->page);
1900                         kfree(map);
1901                 }
1902                 kfree(kvm->arch.adapters[i]);
1903         }
1904 }
1905
1906 static int modify_io_adapter(struct kvm_device *dev,
1907                              struct kvm_device_attr *attr)
1908 {
1909         struct kvm_s390_io_adapter_req req;
1910         struct s390_io_adapter *adapter;
1911         int ret;
1912
1913         if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
1914                 return -EFAULT;
1915
1916         adapter = get_io_adapter(dev->kvm, req.id);
1917         if (!adapter)
1918                 return -EINVAL;
1919         switch (req.type) {
1920         case KVM_S390_IO_ADAPTER_MASK:
1921                 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
1922                 if (ret > 0)
1923                         ret = 0;
1924                 break;
1925         case KVM_S390_IO_ADAPTER_MAP:
1926                 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
1927                 break;
1928         case KVM_S390_IO_ADAPTER_UNMAP:
1929                 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
1930                 break;
1931         default:
1932                 ret = -EINVAL;
1933         }
1934
1935         return ret;
1936 }
1937
1938 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1939 {
1940         int r = 0;
1941         unsigned int i;
1942         struct kvm_vcpu *vcpu;
1943
1944         switch (attr->group) {
1945         case KVM_DEV_FLIC_ENQUEUE:
1946                 r = enqueue_floating_irq(dev, attr);
1947                 break;
1948         case KVM_DEV_FLIC_CLEAR_IRQS:
1949                 kvm_s390_clear_float_irqs(dev->kvm);
1950                 break;
1951         case KVM_DEV_FLIC_APF_ENABLE:
1952                 dev->kvm->arch.gmap->pfault_enabled = 1;
1953                 break;
1954         case KVM_DEV_FLIC_APF_DISABLE_WAIT:
1955                 dev->kvm->arch.gmap->pfault_enabled = 0;
1956                 /*
1957                  * Make sure no async faults are in transition when
1958                  * clearing the queues. So we don't need to worry
1959                  * about late coming workers.
1960                  */
1961                 synchronize_srcu(&dev->kvm->srcu);
1962                 kvm_for_each_vcpu(i, vcpu, dev->kvm)
1963                         kvm_clear_async_pf_completion_queue(vcpu);
1964                 break;
1965         case KVM_DEV_FLIC_ADAPTER_REGISTER:
1966                 r = register_io_adapter(dev, attr);
1967                 break;
1968         case KVM_DEV_FLIC_ADAPTER_MODIFY:
1969                 r = modify_io_adapter(dev, attr);
1970                 break;
1971         default:
1972                 r = -EINVAL;
1973         }
1974
1975         return r;
1976 }
1977
1978 static int flic_create(struct kvm_device *dev, u32 type)
1979 {
1980         if (!dev)
1981                 return -EINVAL;
1982         if (dev->kvm->arch.flic)
1983                 return -EINVAL;
1984         dev->kvm->arch.flic = dev;
1985         return 0;
1986 }
1987
1988 static void flic_destroy(struct kvm_device *dev)
1989 {
1990         dev->kvm->arch.flic = NULL;
1991         kfree(dev);
1992 }
1993
1994 /* s390 floating irq controller (flic) */
1995 struct kvm_device_ops kvm_flic_ops = {
1996         .name = "kvm-flic",
1997         .get_attr = flic_get_attr,
1998         .set_attr = flic_set_attr,
1999         .create = flic_create,
2000         .destroy = flic_destroy,
2001 };
2002
2003 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2004 {
2005         unsigned long bit;
2006
2007         bit = bit_nr + (addr % PAGE_SIZE) * 8;
2008
2009         return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2010 }
2011
2012 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2013                                           u64 addr)
2014 {
2015         struct s390_map_info *map;
2016
2017         if (!adapter)
2018                 return NULL;
2019
2020         list_for_each_entry(map, &adapter->maps, list) {
2021                 if (map->guest_addr == addr)
2022                         return map;
2023         }
2024         return NULL;
2025 }
2026
2027 static int adapter_indicators_set(struct kvm *kvm,
2028                                   struct s390_io_adapter *adapter,
2029                                   struct kvm_s390_adapter_int *adapter_int)
2030 {
2031         unsigned long bit;
2032         int summary_set, idx;
2033         struct s390_map_info *info;
2034         void *map;
2035
2036         info = get_map_info(adapter, adapter_int->ind_addr);
2037         if (!info)
2038                 return -1;
2039         map = page_address(info->page);
2040         bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2041         set_bit(bit, map);
2042         idx = srcu_read_lock(&kvm->srcu);
2043         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2044         set_page_dirty_lock(info->page);
2045         info = get_map_info(adapter, adapter_int->summary_addr);
2046         if (!info) {
2047                 srcu_read_unlock(&kvm->srcu, idx);
2048                 return -1;
2049         }
2050         map = page_address(info->page);
2051         bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2052                           adapter->swap);
2053         summary_set = test_and_set_bit(bit, map);
2054         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2055         set_page_dirty_lock(info->page);
2056         srcu_read_unlock(&kvm->srcu, idx);
2057         return summary_set ? 0 : 1;
2058 }
2059
2060 /*
2061  * < 0 - not injected due to error
2062  * = 0 - coalesced, summary indicator already active
2063  * > 0 - injected interrupt
2064  */
2065 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2066                            struct kvm *kvm, int irq_source_id, int level,
2067                            bool line_status)
2068 {
2069         int ret;
2070         struct s390_io_adapter *adapter;
2071
2072         /* We're only interested in the 0->1 transition. */
2073         if (!level)
2074                 return 0;
2075         adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2076         if (!adapter)
2077                 return -1;
2078         down_read(&adapter->maps_lock);
2079         ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2080         up_read(&adapter->maps_lock);
2081         if ((ret > 0) && !adapter->masked) {
2082                 struct kvm_s390_interrupt s390int = {
2083                         .type = KVM_S390_INT_IO(1, 0, 0, 0),
2084                         .parm = 0,
2085                         .parm64 = (adapter->isc << 27) | 0x80000000,
2086                 };
2087                 ret = kvm_s390_inject_vm(kvm, &s390int);
2088                 if (ret == 0)
2089                         ret = 1;
2090         }
2091         return ret;
2092 }
2093
2094 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
2095                           const struct kvm_irq_routing_entry *ue)
2096 {
2097         int ret;
2098
2099         switch (ue->type) {
2100         case KVM_IRQ_ROUTING_S390_ADAPTER:
2101                 e->set = set_adapter_int;
2102                 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2103                 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2104                 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2105                 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2106                 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2107                 ret = 0;
2108                 break;
2109         default:
2110                 ret = -EINVAL;
2111         }
2112
2113         return ret;
2114 }
2115
2116 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2117                 int irq_source_id, int level, bool line_status)
2118 {
2119         return -EINVAL;
2120 }
2121
2122 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2123 {
2124         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2125         struct kvm_s390_irq *buf;
2126         int r = 0;
2127         int n;
2128
2129         buf = vmalloc(len);
2130         if (!buf)
2131                 return -ENOMEM;
2132
2133         if (copy_from_user((void *) buf, irqstate, len)) {
2134                 r = -EFAULT;
2135                 goto out_free;
2136         }
2137
2138         /*
2139          * Don't allow setting the interrupt state
2140          * when there are already interrupts pending
2141          */
2142         spin_lock(&li->lock);
2143         if (li->pending_irqs) {
2144                 r = -EBUSY;
2145                 goto out_unlock;
2146         }
2147
2148         for (n = 0; n < len / sizeof(*buf); n++) {
2149                 r = do_inject_vcpu(vcpu, &buf[n]);
2150                 if (r)
2151                         break;
2152         }
2153
2154 out_unlock:
2155         spin_unlock(&li->lock);
2156 out_free:
2157         vfree(buf);
2158
2159         return r;
2160 }
2161
2162 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2163                             struct kvm_s390_irq *irq,
2164                             unsigned long irq_type)
2165 {
2166         switch (irq_type) {
2167         case IRQ_PEND_MCHK_EX:
2168         case IRQ_PEND_MCHK_REP:
2169                 irq->type = KVM_S390_MCHK;
2170                 irq->u.mchk = li->irq.mchk;
2171                 break;
2172         case IRQ_PEND_PROG:
2173                 irq->type = KVM_S390_PROGRAM_INT;
2174                 irq->u.pgm = li->irq.pgm;
2175                 break;
2176         case IRQ_PEND_PFAULT_INIT:
2177                 irq->type = KVM_S390_INT_PFAULT_INIT;
2178                 irq->u.ext = li->irq.ext;
2179                 break;
2180         case IRQ_PEND_EXT_EXTERNAL:
2181                 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2182                 irq->u.extcall = li->irq.extcall;
2183                 break;
2184         case IRQ_PEND_EXT_CLOCK_COMP:
2185                 irq->type = KVM_S390_INT_CLOCK_COMP;
2186                 break;
2187         case IRQ_PEND_EXT_CPU_TIMER:
2188                 irq->type = KVM_S390_INT_CPU_TIMER;
2189                 break;
2190         case IRQ_PEND_SIGP_STOP:
2191                 irq->type = KVM_S390_SIGP_STOP;
2192                 irq->u.stop = li->irq.stop;
2193                 break;
2194         case IRQ_PEND_RESTART:
2195                 irq->type = KVM_S390_RESTART;
2196                 break;
2197         case IRQ_PEND_SET_PREFIX:
2198                 irq->type = KVM_S390_SIGP_SET_PREFIX;
2199                 irq->u.prefix = li->irq.prefix;
2200                 break;
2201         }
2202 }
2203
2204 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2205 {
2206         uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
2207         unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2208         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2209         unsigned long pending_irqs;
2210         struct kvm_s390_irq irq;
2211         unsigned long irq_type;
2212         int cpuaddr;
2213         int n = 0;
2214
2215         spin_lock(&li->lock);
2216         pending_irqs = li->pending_irqs;
2217         memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2218                sizeof(sigp_emerg_pending));
2219         spin_unlock(&li->lock);
2220
2221         for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2222                 memset(&irq, 0, sizeof(irq));
2223                 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2224                         continue;
2225                 if (n + sizeof(irq) > len)
2226                         return -ENOBUFS;
2227                 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2228                 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2229                         return -EFAULT;
2230                 n += sizeof(irq);
2231         }
2232
2233         if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2234                 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2235                         memset(&irq, 0, sizeof(irq));
2236                         if (n + sizeof(irq) > len)
2237                                 return -ENOBUFS;
2238                         irq.type = KVM_S390_INT_EMERGENCY;
2239                         irq.u.emerg.code = cpuaddr;
2240                         if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2241                                 return -EFAULT;
2242                         n += sizeof(irq);
2243                 }
2244         }
2245
2246         if ((sigp_ctrl & SIGP_CTRL_C) &&
2247             (atomic_read(&vcpu->arch.sie_block->cpuflags) &
2248              CPUSTAT_ECALL_PEND)) {
2249                 if (n + sizeof(irq) > len)
2250                         return -ENOBUFS;
2251                 memset(&irq, 0, sizeof(irq));
2252                 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2253                 irq.u.extcall.code = sigp_ctrl & SIGP_CTRL_SCN_MASK;
2254                 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2255                         return -EFAULT;
2256                 n += sizeof(irq);
2257         }
2258
2259         return n;
2260 }