arch/s390/kvm/interrupt.c

   1 /*
   2  * handling kvm guest interrupts
   3  *
   4  * Copyright IBM Corp. 2008, 2015
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License (version 2 only)
   8  * as published by the Free Software Foundation.
   9  *
  10  *    Author(s): Carsten Otte <cotte@de.ibm.com>
  11  */
  12
  13 #include <linux/interrupt.h>
  14 #include <linux/kvm_host.h>
  15 #include <linux/hrtimer.h>
  16 #include <linux/mmu_context.h>
  17 #include <linux/signal.h>
  18 #include <linux/slab.h>
  19 #include <linux/bitmap.h>
  20 #include <linux/vmalloc.h>
  21 #include <asm/asm-offsets.h>
  22 #include <asm/dis.h>
  23 #include <asm/uaccess.h>
  24 #include <asm/sclp.h>
  25 #include <asm/isc.h>
  26 #include <asm/gmap.h>
  27 #include "kvm-s390.h"
  28 #include "gaccess.h"
  29 #include "trace-s390.h"
  30
  31 #define IOINT_SCHID_MASK 0x0000ffff
  32 #define IOINT_SSID_MASK 0x00030000
  33 #define IOINT_CSSID_MASK 0x03fc0000
  34 #define PFAULT_INIT 0x0600
  35 #define PFAULT_DONE 0x0680
  36 #define VIRTIO_PARAM 0x0d00
  37
  38 /* handle external calls via sigp interpretation facility */
  39 static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id)
  40 {
  41         int c, scn;
  42
  43         if (!(atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND))
  44                 return 0;
  45
  46         read_lock(&vcpu->kvm->arch.sca_lock);
  47         if (vcpu->kvm->arch.use_esca) {
  48                 struct esca_block *sca = vcpu->kvm->arch.sca;
  49                 union esca_sigp_ctrl sigp_ctrl =
  50                         sca->cpu[vcpu->vcpu_id].sigp_ctrl;
  51
  52                 c = sigp_ctrl.c;
  53                 scn = sigp_ctrl.scn;
  54         } else {
  55                 struct bsca_block *sca = vcpu->kvm->arch.sca;
  56                 union bsca_sigp_ctrl sigp_ctrl =
  57                         sca->cpu[vcpu->vcpu_id].sigp_ctrl;
  58
  59                 c = sigp_ctrl.c;
  60                 scn = sigp_ctrl.scn;
  61         }
  62         read_unlock(&vcpu->kvm->arch.sca_lock);
  63
  64         if (src_id)
  65                 *src_id = scn;
  66
  67         return c;
  68 }
  69
  70 static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)
  71 {
  72         int expect, rc;
  73
  74         read_lock(&vcpu->kvm->arch.sca_lock);
  75         if (vcpu->kvm->arch.use_esca) {
  76                 struct esca_block *sca = vcpu->kvm->arch.sca;
  77                 union esca_sigp_ctrl *sigp_ctrl =
  78                         &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
  79                 union esca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
  80
  81                 new_val.scn = src_id;
  82                 new_val.c = 1;
  83                 old_val.c = 0;
  84
  85                 expect = old_val.value;
  86                 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
  87         } else {
  88                 struct bsca_block *sca = vcpu->kvm->arch.sca;
  89                 union bsca_sigp_ctrl *sigp_ctrl =
  90                         &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
  91                 union bsca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
  92
  93                 new_val.scn = src_id;
  94                 new_val.c = 1;
  95                 old_val.c = 0;
  96
  97                 expect = old_val.value;
  98                 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
  99         }
 100         read_unlock(&vcpu->kvm->arch.sca_lock);
 101
 102         if (rc != expect) {
 103                 /* another external call is pending */
 104                 return -EBUSY;
 105         }
 106         atomic_or(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
 107         return 0;
 108 }
 109
 110 static void sca_clear_ext_call(struct kvm_vcpu *vcpu)
 111 {
 112         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 113         int rc, expect;
 114
 115         atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags);
 116         read_lock(&vcpu->kvm->arch.sca_lock);
 117         if (vcpu->kvm->arch.use_esca) {
 118                 struct esca_block *sca = vcpu->kvm->arch.sca;
 119                 union esca_sigp_ctrl *sigp_ctrl =
 120                         &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
 121                 union esca_sigp_ctrl old = *sigp_ctrl;
 122
 123                 expect = old.value;
 124                 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
 125         } else {
 126                 struct bsca_block *sca = vcpu->kvm->arch.sca;
 127                 union bsca_sigp_ctrl *sigp_ctrl =
 128                         &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
 129                 union bsca_sigp_ctrl old = *sigp_ctrl;
 130
 131                 expect = old.value;
 132                 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
 133         }
 134         read_unlock(&vcpu->kvm->arch.sca_lock);
 135         WARN_ON(rc != expect); /* cannot clear? */
 136 }
 137
 138 int psw_extint_disabled(struct kvm_vcpu *vcpu)
 139 {
 140         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
 141 }
 142
 143 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
 144 {
 145         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
 146 }
 147
 148 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
 149 {
 150         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
 151 }
 152
 153 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
 154 {
 155         return psw_extint_disabled(vcpu) &&
 156                psw_ioint_disabled(vcpu) &&
 157                psw_mchk_disabled(vcpu);
 158 }
 159
 160 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
 161 {
 162         if (psw_extint_disabled(vcpu) ||
 163             !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
 164                 return 0;
 165         if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
 166                 /* No timer interrupts when single stepping */
 167                 return 0;
 168         return 1;
 169 }
 170
 171 static int ckc_irq_pending(struct kvm_vcpu *vcpu)
 172 {
 173         if (vcpu->arch.sie_block->ckc >= kvm_s390_get_tod_clock_fast(vcpu->kvm))
 174                 return 0;
 175         return ckc_interrupts_enabled(vcpu);
 176 }
 177
 178 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
 179 {
 180         return !psw_extint_disabled(vcpu) &&
 181                (vcpu->arch.sie_block->gcr[0] & 0x400ul);
 182 }
 183
 184 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
 185 {
 186         if (!cpu_timer_interrupts_enabled(vcpu))
 187                 return 0;
 188         return kvm_s390_get_cpu_timer(vcpu) >> 63;
 189 }
 190
 191 static inline int is_ioirq(unsigned long irq_type)
 192 {
 193         return ((irq_type >= IRQ_PEND_IO_ISC_0) &&
 194                 (irq_type <= IRQ_PEND_IO_ISC_7));
 195 }
 196
 197 static uint64_t isc_to_isc_bits(int isc)
 198 {
 199         return (0x80 >> isc) << 24;
 200 }
 201
 202 static inline u8 int_word_to_isc(u32 int_word)
 203 {
 204         return (int_word & 0x38000000) >> 27;
 205 }
 206
 207 static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
 208 {
 209         return vcpu->kvm->arch.float_int.pending_irqs |
 210                vcpu->arch.local_int.pending_irqs;
 211 }
 212
 213 static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
 214                                    unsigned long active_mask)
 215 {
 216         int i;
 217
 218         for (i = 0; i <= MAX_ISC; i++)
 219                 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
 220                         active_mask &= ~(1UL << (IRQ_PEND_IO_ISC_0 + i));
 221
 222         return active_mask;
 223 }
 224
 225 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
 226 {
 227         unsigned long active_mask;
 228
 229         active_mask = pending_irqs(vcpu);
 230         if (!active_mask)
 231                 return 0;
 232
 233         if (psw_extint_disabled(vcpu))
 234                 active_mask &= ~IRQ_PEND_EXT_MASK;
 235         if (psw_ioint_disabled(vcpu))
 236                 active_mask &= ~IRQ_PEND_IO_MASK;
 237         else
 238                 active_mask = disable_iscs(vcpu, active_mask);
 239         if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
 240                 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
 241         if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
 242                 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
 243         if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
 244                 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
 245         if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
 246                 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
 247         if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
 248                 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
 249         if (psw_mchk_disabled(vcpu))
 250                 active_mask &= ~IRQ_PEND_MCHK_MASK;
 251         if (!(vcpu->arch.sie_block->gcr[14] &
 252               vcpu->kvm->arch.float_int.mchk.cr14))
 253                 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
 254
 255         /*
 256          * STOP irqs will never be actively delivered. They are triggered via
 257          * intercept requests and cleared when the stop intercept is performed.
 258          */
 259         __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
 260
 261         return active_mask;
 262 }
 263
 264 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
 265 {
 266         atomic_or(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 267         set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 268 }
 269
 270 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
 271 {
 272         atomic_andnot(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 273         clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 274 }
 275
 276 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
 277 {
 278         atomic_andnot(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
 279                     &vcpu->arch.sie_block->cpuflags);
 280         vcpu->arch.sie_block->lctl = 0x0000;
 281         vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
 282
 283         if (guestdbg_enabled(vcpu)) {
 284                 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
 285                                                LCTL_CR10 | LCTL_CR11);
 286                 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
 287         }
 288 }
 289
 290 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
 291 {
 292         atomic_or(flag, &vcpu->arch.sie_block->cpuflags);
 293 }
 294
 295 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
 296 {
 297         if (!(pending_irqs(vcpu) & IRQ_PEND_IO_MASK))
 298                 return;
 299         else if (psw_ioint_disabled(vcpu))
 300                 __set_cpuflag(vcpu, CPUSTAT_IO_INT);
 301         else
 302                 vcpu->arch.sie_block->lctl |= LCTL_CR6;
 303 }
 304
 305 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
 306 {
 307         if (!(pending_irqs(vcpu) & IRQ_PEND_EXT_MASK))
 308                 return;
 309         if (psw_extint_disabled(vcpu))
 310                 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
 311         else
 312                 vcpu->arch.sie_block->lctl |= LCTL_CR0;
 313 }
 314
 315 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
 316 {
 317         if (!(pending_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
 318                 return;
 319         if (psw_mchk_disabled(vcpu))
 320                 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
 321         else
 322                 vcpu->arch.sie_block->lctl |= LCTL_CR14;
 323 }
 324
 325 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
 326 {
 327         if (kvm_s390_is_stop_irq_pending(vcpu))
 328                 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
 329 }
 330
 331 /* Set interception request for non-deliverable interrupts */
 332 static void set_intercept_indicators(struct kvm_vcpu *vcpu)
 333 {
 334         set_intercept_indicators_io(vcpu);
 335         set_intercept_indicators_ext(vcpu);
 336         set_intercept_indicators_mchk(vcpu);
 337         set_intercept_indicators_stop(vcpu);
 338 }
 339
 340 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
 341 {
 342         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 343         int rc;
 344
 345         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
 346                                          0, 0);
 347
 348         rc  = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
 349                            (u16 *)__LC_EXT_INT_CODE);
 350         rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 351         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 352                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 353         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 354                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 355         clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
 356         return rc ? -EFAULT : 0;
 357 }
 358
 359 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
 360 {
 361         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 362         int rc;
 363
 364         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
 365                                          0, 0);
 366
 367         rc  = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
 368                            (u16 __user *)__LC_EXT_INT_CODE);
 369         rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 370         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 371                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 372         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 373                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 374         clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
 375         return rc ? -EFAULT : 0;
 376 }
 377
 378 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
 379 {
 380         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 381         struct kvm_s390_ext_info ext;
 382         int rc;
 383
 384         spin_lock(&li->lock);
 385         ext = li->irq.ext;
 386         clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
 387         li->irq.ext.ext_params2 = 0;
 388         spin_unlock(&li->lock);
 389
 390         VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
 391                    ext.ext_params2);
 392         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 393                                          KVM_S390_INT_PFAULT_INIT,
 394                                          0, ext.ext_params2);
 395
 396         rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
 397         rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
 398         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 399                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 400         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 401                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 402         rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
 403         return rc ? -EFAULT : 0;
 404 }
 405
 406 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
 407 {
 408         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 409         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 410         struct kvm_s390_mchk_info mchk = {};
 411         unsigned long adtl_status_addr;
 412         int deliver = 0;
 413         int rc = 0;
 414
 415         spin_lock(&fi->lock);
 416         spin_lock(&li->lock);
 417         if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
 418             test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
 419                 /*
 420                  * If there was an exigent machine check pending, then any
 421                  * repressible machine checks that might have been pending
 422                  * are indicated along with it, so always clear bits for
 423                  * repressible and exigent interrupts
 424                  */
 425                 mchk = li->irq.mchk;
 426                 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
 427                 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
 428                 memset(&li->irq.mchk, 0, sizeof(mchk));
 429                 deliver = 1;
 430         }
 431         /*
 432          * We indicate floating repressible conditions along with
 433          * other pending conditions. Channel Report Pending and Channel
 434          * Subsystem damage are the only two and and are indicated by
 435          * bits in mcic and masked in cr14.
 436          */
 437         if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
 438                 mchk.mcic |= fi->mchk.mcic;
 439                 mchk.cr14 |= fi->mchk.cr14;
 440                 memset(&fi->mchk, 0, sizeof(mchk));
 441                 deliver = 1;
 442         }
 443         spin_unlock(&li->lock);
 444         spin_unlock(&fi->lock);
 445
 446         if (deliver) {
 447                 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
 448                            mchk.mcic);
 449                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 450                                                  KVM_S390_MCHK,
 451                                                  mchk.cr14, mchk.mcic);
 452
 453                 rc  = kvm_s390_vcpu_store_status(vcpu,
 454                                                  KVM_S390_STORE_STATUS_PREFIXED);
 455                 rc |= read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR,
 456                                     &adtl_status_addr,
 457                                     sizeof(unsigned long));
 458                 rc |= kvm_s390_vcpu_store_adtl_status(vcpu,
 459                                                       adtl_status_addr);
 460                 rc |= put_guest_lc(vcpu, mchk.mcic,
 461                                    (u64 __user *) __LC_MCCK_CODE);
 462                 rc |= put_guest_lc(vcpu, mchk.failing_storage_address,
 463                                    (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
 464                 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA,
 465                                      &mchk.fixed_logout,
 466                                      sizeof(mchk.fixed_logout));
 467                 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
 468                                      &vcpu->arch.sie_block->gpsw,
 469                                      sizeof(psw_t));
 470                 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
 471                                     &vcpu->arch.sie_block->gpsw,
 472                                     sizeof(psw_t));
 473         }
 474         return rc ? -EFAULT : 0;
 475 }
 476
 477 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
 478 {
 479         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 480         int rc;
 481
 482         VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
 483         vcpu->stat.deliver_restart_signal++;
 484         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
 485
 486         rc  = write_guest_lc(vcpu,
 487                              offsetof(struct lowcore, restart_old_psw),
 488                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 489         rc |= read_guest_lc(vcpu, offsetof(struct lowcore, restart_psw),
 490                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 491         clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
 492         return rc ? -EFAULT : 0;
 493 }
 494
 495 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
 496 {
 497         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 498         struct kvm_s390_prefix_info prefix;
 499
 500         spin_lock(&li->lock);
 501         prefix = li->irq.prefix;
 502         li->irq.prefix.address = 0;
 503         clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
 504         spin_unlock(&li->lock);
 505
 506         vcpu->stat.deliver_prefix_signal++;
 507         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 508                                          KVM_S390_SIGP_SET_PREFIX,
 509                                          prefix.address, 0);
 510
 511         kvm_s390_set_prefix(vcpu, prefix.address);
 512         return 0;
 513 }
 514
 515 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
 516 {
 517         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 518         int rc;
 519         int cpu_addr;
 520
 521         spin_lock(&li->lock);
 522         cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
 523         clear_bit(cpu_addr, li->sigp_emerg_pending);
 524         if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
 525                 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
 526         spin_unlock(&li->lock);
 527
 528         VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
 529         vcpu->stat.deliver_emergency_signal++;
 530         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
 531                                          cpu_addr, 0);
 532
 533         rc  = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
 534                            (u16 *)__LC_EXT_INT_CODE);
 535         rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
 536         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 537                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 538         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 539                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 540         return rc ? -EFAULT : 0;
 541 }
 542
 543 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
 544 {
 545         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 546         struct kvm_s390_extcall_info extcall;
 547         int rc;
 548
 549         spin_lock(&li->lock);
 550         extcall = li->irq.extcall;
 551         li->irq.extcall.code = 0;
 552         clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
 553         spin_unlock(&li->lock);
 554
 555         VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
 556         vcpu->stat.deliver_external_call++;
 557         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 558                                          KVM_S390_INT_EXTERNAL_CALL,
 559                                          extcall.code, 0);
 560
 561         rc  = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
 562                            (u16 *)__LC_EXT_INT_CODE);
 563         rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
 564         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 565                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 566         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
 567                             sizeof(psw_t));
 568         return rc ? -EFAULT : 0;
 569 }
 570
 571 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
 572 {
 573         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 574         struct kvm_s390_pgm_info pgm_info;
 575         int rc = 0, nullifying = false;
 576         u16 ilen;
 577
 578         spin_lock(&li->lock);
 579         pgm_info = li->irq.pgm;
 580         clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
 581         memset(&li->irq.pgm, 0, sizeof(pgm_info));
 582         spin_unlock(&li->lock);
 583
 584         ilen = pgm_info.flags & KVM_S390_PGM_FLAGS_ILC_MASK;
 585         VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilen:%d",
 586                    pgm_info.code, ilen);
 587         vcpu->stat.deliver_program_int++;
 588         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
 589                                          pgm_info.code, 0);
 590
 591         switch (pgm_info.code & ~PGM_PER) {
 592         case PGM_AFX_TRANSLATION:
 593         case PGM_ASX_TRANSLATION:
 594         case PGM_EX_TRANSLATION:
 595         case PGM_LFX_TRANSLATION:
 596         case PGM_LSTE_SEQUENCE:
 597         case PGM_LSX_TRANSLATION:
 598         case PGM_LX_TRANSLATION:
 599         case PGM_PRIMARY_AUTHORITY:
 600         case PGM_SECONDARY_AUTHORITY:
 601                 nullifying = true;
 602                 /* fall through */
 603         case PGM_SPACE_SWITCH:
 604                 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
 605                                   (u64 *)__LC_TRANS_EXC_CODE);
 606                 break;
 607         case PGM_ALEN_TRANSLATION:
 608         case PGM_ALE_SEQUENCE:
 609         case PGM_ASTE_INSTANCE:
 610         case PGM_ASTE_SEQUENCE:
 611         case PGM_ASTE_VALIDITY:
 612         case PGM_EXTENDED_AUTHORITY:
 613                 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
 614                                   (u8 *)__LC_EXC_ACCESS_ID);
 615                 nullifying = true;
 616                 break;
 617         case PGM_ASCE_TYPE:
 618         case PGM_PAGE_TRANSLATION:
 619         case PGM_REGION_FIRST_TRANS:
 620         case PGM_REGION_SECOND_TRANS:
 621         case PGM_REGION_THIRD_TRANS:
 622         case PGM_SEGMENT_TRANSLATION:
 623                 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
 624                                   (u64 *)__LC_TRANS_EXC_CODE);
 625                 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
 626                                    (u8 *)__LC_EXC_ACCESS_ID);
 627                 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
 628                                    (u8 *)__LC_OP_ACCESS_ID);
 629                 nullifying = true;
 630                 break;
 631         case PGM_MONITOR:
 632                 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
 633                                   (u16 *)__LC_MON_CLASS_NR);
 634                 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
 635                                    (u64 *)__LC_MON_CODE);
 636                 break;
 637         case PGM_VECTOR_PROCESSING:
 638         case PGM_DATA:
 639                 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
 640                                   (u32 *)__LC_DATA_EXC_CODE);
 641                 break;
 642         case PGM_PROTECTION:
 643                 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
 644                                   (u64 *)__LC_TRANS_EXC_CODE);
 645                 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
 646                                    (u8 *)__LC_EXC_ACCESS_ID);
 647                 break;
 648         case PGM_STACK_FULL:
 649         case PGM_STACK_EMPTY:
 650         case PGM_STACK_SPECIFICATION:
 651         case PGM_STACK_TYPE:
 652         case PGM_STACK_OPERATION:
 653         case PGM_TRACE_TABEL:
 654         case PGM_CRYPTO_OPERATION:
 655                 nullifying = true;
 656                 break;
 657         }
 658
 659         if (pgm_info.code & PGM_PER) {
 660                 rc |= put_guest_lc(vcpu, pgm_info.per_code,
 661                                    (u8 *) __LC_PER_CODE);
 662                 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
 663                                    (u8 *)__LC_PER_ATMID);
 664                 rc |= put_guest_lc(vcpu, pgm_info.per_address,
 665                                    (u64 *) __LC_PER_ADDRESS);
 666                 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
 667                                    (u8 *) __LC_PER_ACCESS_ID);
 668         }
 669
 670         if (nullifying && !(pgm_info.flags & KVM_S390_PGM_FLAGS_NO_REWIND))
 671                 kvm_s390_rewind_psw(vcpu, ilen);
 672
 673         /* bit 1+2 of the target are the ilc, so we can directly use ilen */
 674         rc |= put_guest_lc(vcpu, ilen, (u16 *) __LC_PGM_ILC);
 675         rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
 676                                  (u64 *) __LC_LAST_BREAK);
 677         rc |= put_guest_lc(vcpu, pgm_info.code,
 678                            (u16 *)__LC_PGM_INT_CODE);
 679         rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
 680                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 681         rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
 682                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 683         return rc ? -EFAULT : 0;
 684 }
 685
 686 static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
 687 {
 688         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 689         struct kvm_s390_ext_info ext;
 690         int rc = 0;
 691
 692         spin_lock(&fi->lock);
 693         if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
 694                 spin_unlock(&fi->lock);
 695                 return 0;
 696         }
 697         ext = fi->srv_signal;
 698         memset(&fi->srv_signal, 0, sizeof(ext));
 699         clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
 700         spin_unlock(&fi->lock);
 701
 702         VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
 703                    ext.ext_params);
 704         vcpu->stat.deliver_service_signal++;
 705         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
 706                                          ext.ext_params, 0);
 707
 708         rc  = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
 709         rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 710         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 711                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 712         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 713                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 714         rc |= put_guest_lc(vcpu, ext.ext_params,
 715                            (u32 *)__LC_EXT_PARAMS);
 716
 717         return rc ? -EFAULT : 0;
 718 }
 719
 720 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
 721 {
 722         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 723         struct kvm_s390_interrupt_info *inti;
 724         int rc = 0;
 725
 726         spin_lock(&fi->lock);
 727         inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
 728                                         struct kvm_s390_interrupt_info,
 729                                         list);
 730         if (inti) {
 731                 list_del(&inti->list);
 732                 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
 733         }
 734         if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
 735                 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
 736         spin_unlock(&fi->lock);
 737
 738         if (inti) {
 739                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 740                                                  KVM_S390_INT_PFAULT_DONE, 0,
 741                                                  inti->ext.ext_params2);
 742                 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
 743                            inti->ext.ext_params2);
 744
 745                 rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
 746                                 (u16 *)__LC_EXT_INT_CODE);
 747                 rc |= put_guest_lc(vcpu, PFAULT_DONE,
 748                                 (u16 *)__LC_EXT_CPU_ADDR);
 749                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 750                                 &vcpu->arch.sie_block->gpsw,
 751                                 sizeof(psw_t));
 752                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 753                                 &vcpu->arch.sie_block->gpsw,
 754                                 sizeof(psw_t));
 755                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 756                                 (u64 *)__LC_EXT_PARAMS2);
 757                 kfree(inti);
 758         }
 759         return rc ? -EFAULT : 0;
 760 }
 761
 762 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
 763 {
 764         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 765         struct kvm_s390_interrupt_info *inti;
 766         int rc = 0;
 767
 768         spin_lock(&fi->lock);
 769         inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
 770                                         struct kvm_s390_interrupt_info,
 771                                         list);
 772         if (inti) {
 773                 VCPU_EVENT(vcpu, 4,
 774                            "deliver: virtio parm: 0x%x,parm64: 0x%llx",
 775                            inti->ext.ext_params, inti->ext.ext_params2);
 776                 vcpu->stat.deliver_virtio_interrupt++;
 777                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 778                                 inti->type,
 779                                 inti->ext.ext_params,
 780                                 inti->ext.ext_params2);
 781                 list_del(&inti->list);
 782                 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
 783         }
 784         if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
 785                 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
 786         spin_unlock(&fi->lock);
 787
 788         if (inti) {
 789                 rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
 790                                 (u16 *)__LC_EXT_INT_CODE);
 791                 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
 792                                 (u16 *)__LC_EXT_CPU_ADDR);
 793                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 794                                 &vcpu->arch.sie_block->gpsw,
 795                                 sizeof(psw_t));
 796                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 797                                 &vcpu->arch.sie_block->gpsw,
 798                                 sizeof(psw_t));
 799                 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
 800                                 (u32 *)__LC_EXT_PARAMS);
 801                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 802                                 (u64 *)__LC_EXT_PARAMS2);
 803                 kfree(inti);
 804         }
 805         return rc ? -EFAULT : 0;
 806 }
 807
 808 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
 809                                      unsigned long irq_type)
 810 {
 811         struct list_head *isc_list;
 812         struct kvm_s390_float_interrupt *fi;
 813         struct kvm_s390_interrupt_info *inti = NULL;
 814         int rc = 0;
 815
 816         fi = &vcpu->kvm->arch.float_int;
 817
 818         spin_lock(&fi->lock);
 819         isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0];
 820         inti = list_first_entry_or_null(isc_list,
 821                                         struct kvm_s390_interrupt_info,
 822                                         list);
 823         if (inti) {
 824                 VCPU_EVENT(vcpu, 4, "deliver: I/O 0x%llx", inti->type);
 825                 vcpu->stat.deliver_io_int++;
 826                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 827                                 inti->type,
 828                                 ((__u32)inti->io.subchannel_id << 16) |
 829                                 inti->io.subchannel_nr,
 830                                 ((__u64)inti->io.io_int_parm << 32) |
 831                                 inti->io.io_int_word);
 832                 list_del(&inti->list);
 833                 fi->counters[FIRQ_CNTR_IO] -= 1;
 834         }
 835         if (list_empty(isc_list))
 836                 clear_bit(irq_type, &fi->pending_irqs);
 837         spin_unlock(&fi->lock);
 838
 839         if (inti) {
 840                 rc  = put_guest_lc(vcpu, inti->io.subchannel_id,
 841                                 (u16 *)__LC_SUBCHANNEL_ID);
 842                 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
 843                                 (u16 *)__LC_SUBCHANNEL_NR);
 844                 rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
 845                                 (u32 *)__LC_IO_INT_PARM);
 846                 rc |= put_guest_lc(vcpu, inti->io.io_int_word,
 847                                 (u32 *)__LC_IO_INT_WORD);
 848                 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
 849                                 &vcpu->arch.sie_block->gpsw,
 850                                 sizeof(psw_t));
 851                 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
 852                                 &vcpu->arch.sie_block->gpsw,
 853                                 sizeof(psw_t));
 854                 kfree(inti);
 855         }
 856
 857         return rc ? -EFAULT : 0;
 858 }
 859
 860 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);
 861
 862 static const deliver_irq_t deliver_irq_funcs[] = {
 863         [IRQ_PEND_MCHK_EX]        = __deliver_machine_check,
 864         [IRQ_PEND_MCHK_REP]       = __deliver_machine_check,
 865         [IRQ_PEND_PROG]           = __deliver_prog,
 866         [IRQ_PEND_EXT_EMERGENCY]  = __deliver_emergency_signal,
 867         [IRQ_PEND_EXT_EXTERNAL]   = __deliver_external_call,
 868         [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc,
 869         [IRQ_PEND_EXT_CPU_TIMER]  = __deliver_cpu_timer,
 870         [IRQ_PEND_RESTART]        = __deliver_restart,
 871         [IRQ_PEND_SET_PREFIX]     = __deliver_set_prefix,
 872         [IRQ_PEND_PFAULT_INIT]    = __deliver_pfault_init,
 873         [IRQ_PEND_EXT_SERVICE]    = __deliver_service,
 874         [IRQ_PEND_PFAULT_DONE]    = __deliver_pfault_done,
 875         [IRQ_PEND_VIRTIO]         = __deliver_virtio,
 876 };
 877
 878 /* Check whether an external call is pending (deliverable or not) */
 879 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
 880 {
 881         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 882
 883         if (!sclp.has_sigpif)
 884                 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
 885
 886         return sca_ext_call_pending(vcpu, NULL);
 887 }
 888
 889 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
 890 {
 891         if (deliverable_irqs(vcpu))
 892                 return 1;
 893
 894         if (kvm_cpu_has_pending_timer(vcpu))
 895                 return 1;
 896
 897         /* external call pending and deliverable */
 898         if (kvm_s390_ext_call_pending(vcpu) &&
 899             !psw_extint_disabled(vcpu) &&
 900             (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
 901                 return 1;
 902
 903         if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
 904                 return 1;
 905         return 0;
 906 }
 907
 908 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 909 {
 910         return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
 911 }
 912
 913 static u64 __calculate_sltime(struct kvm_vcpu *vcpu)
 914 {
 915         u64 now, cputm, sltime = 0;
 916
 917         if (ckc_interrupts_enabled(vcpu)) {
 918                 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
 919                 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
 920                 /* already expired or overflow? */
 921                 if (!sltime || vcpu->arch.sie_block->ckc <= now)
 922                         return 0;
 923                 if (cpu_timer_interrupts_enabled(vcpu)) {
 924                         cputm = kvm_s390_get_cpu_timer(vcpu);
 925                         /* already expired? */
 926                         if (cputm >> 63)
 927                                 return 0;
 928                         return min(sltime, tod_to_ns(cputm));
 929                 }
 930         } else if (cpu_timer_interrupts_enabled(vcpu)) {
 931                 sltime = kvm_s390_get_cpu_timer(vcpu);
 932                 /* already expired? */
 933                 if (sltime >> 63)
 934                         return 0;
 935         }
 936         return sltime;
 937 }
 938
 939 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
 940 {
 941         u64 sltime;
 942
 943         vcpu->stat.exit_wait_state++;
 944
 945         /* fast path */
 946         if (kvm_arch_vcpu_runnable(vcpu))
 947                 return 0;
 948
 949         if (psw_interrupts_disabled(vcpu)) {
 950                 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
 951                 return -EOPNOTSUPP; /* disabled wait */
 952         }
 953
 954         if (!ckc_interrupts_enabled(vcpu) &&
 955             !cpu_timer_interrupts_enabled(vcpu)) {
 956                 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
 957                 __set_cpu_idle(vcpu);
 958                 goto no_timer;
 959         }
 960
 961         sltime = __calculate_sltime(vcpu);
 962         if (!sltime)
 963                 return 0;
 964
 965         __set_cpu_idle(vcpu);
 966         hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
 967         VCPU_EVENT(vcpu, 4, "enabled wait: %llu ns", sltime);
 968 no_timer:
 969         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
 970         kvm_vcpu_block(vcpu);
 971         __unset_cpu_idle(vcpu);
 972         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
 973
 974         hrtimer_cancel(&vcpu->arch.ckc_timer);
 975         return 0;
 976 }
 977
 978 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
 979 {
 980         /*
 981          * We cannot move this into the if, as the CPU might be already
 982          * in kvm_vcpu_block without having the waitqueue set (polling)
 983          */
 984         vcpu->valid_wakeup = true;
 985         if (swait_active(&vcpu->wq)) {
 986                 /*
 987                  * The vcpu gave up the cpu voluntarily, mark it as a good
 988                  * yield-candidate.
 989                  */
 990                 vcpu->preempted = true;
 991                 swake_up(&vcpu->wq);
 992                 vcpu->stat.halt_wakeup++;
 993         }
 994 }
 995
 996 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
 997 {
 998         struct kvm_vcpu *vcpu;
 999         u64 sltime;
1000
1001         vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
1002         sltime = __calculate_sltime(vcpu);
1003
1004         /*
1005          * If the monotonic clock runs faster than the tod clock we might be
1006          * woken up too early and have to go back to sleep to avoid deadlocks.
1007          */
1008         if (sltime && hrtimer_forward_now(timer, ns_to_ktime(sltime)))
1009                 return HRTIMER_RESTART;
1010         kvm_s390_vcpu_wakeup(vcpu);
1011         return HRTIMER_NORESTART;
1012 }
1013
1014 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
1015 {
1016         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1017
1018         spin_lock(&li->lock);
1019         li->pending_irqs = 0;
1020         bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
1021         memset(&li->irq, 0, sizeof(li->irq));
1022         spin_unlock(&li->lock);
1023
1024         sca_clear_ext_call(vcpu);
1025 }
1026
1027 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
1028 {
1029         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1030         deliver_irq_t func;
1031         int rc = 0;
1032         unsigned long irq_type;
1033         unsigned long irqs;
1034
1035         __reset_intercept_indicators(vcpu);
1036
1037         /* pending ckc conditions might have been invalidated */
1038         clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1039         if (ckc_irq_pending(vcpu))
1040                 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1041
1042         /* pending cpu timer conditions might have been invalidated */
1043         clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1044         if (cpu_timer_irq_pending(vcpu))
1045                 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1046
1047         while ((irqs = deliverable_irqs(vcpu)) && !rc) {
1048                 /* bits are in the order of interrupt priority */
1049                 irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT);
1050                 if (is_ioirq(irq_type)) {
1051                         rc = __deliver_io(vcpu, irq_type);
1052                 } else {
1053                         func = deliver_irq_funcs[irq_type];
1054                         if (!func) {
1055                                 WARN_ON_ONCE(func == NULL);
1056                                 clear_bit(irq_type, &li->pending_irqs);
1057                                 continue;
1058                         }
1059                         rc = func(vcpu);
1060                 }
1061         }
1062
1063         set_intercept_indicators(vcpu);
1064
1065         return rc;
1066 }
1067
1068 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1069 {
1070         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1071
1072         VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
1073         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
1074                                    irq->u.pgm.code, 0);
1075
1076         if (!(irq->u.pgm.flags & KVM_S390_PGM_FLAGS_ILC_VALID)) {
1077                 /* auto detection if no valid ILC was given */
1078                 irq->u.pgm.flags &= ~KVM_S390_PGM_FLAGS_ILC_MASK;
1079                 irq->u.pgm.flags |= kvm_s390_get_ilen(vcpu);
1080                 irq->u.pgm.flags |= KVM_S390_PGM_FLAGS_ILC_VALID;
1081         }
1082
1083         if (irq->u.pgm.code == PGM_PER) {
1084                 li->irq.pgm.code |= PGM_PER;
1085                 li->irq.pgm.flags = irq->u.pgm.flags;
1086                 /* only modify PER related information */
1087                 li->irq.pgm.per_address = irq->u.pgm.per_address;
1088                 li->irq.pgm.per_code = irq->u.pgm.per_code;
1089                 li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
1090                 li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
1091         } else if (!(irq->u.pgm.code & PGM_PER)) {
1092                 li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
1093                                    irq->u.pgm.code;
1094                 li->irq.pgm.flags = irq->u.pgm.flags;
1095                 /* only modify non-PER information */
1096                 li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
1097                 li->irq.pgm.mon_code = irq->u.pgm.mon_code;
1098                 li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
1099                 li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
1100                 li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
1101                 li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
1102         } else {
1103                 li->irq.pgm = irq->u.pgm;
1104         }
1105         set_bit(IRQ_PEND_PROG, &li->pending_irqs);
1106         return 0;
1107 }
1108
1109 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1110 {
1111         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1112
1113         VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
1114                    irq->u.ext.ext_params2);
1115         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1116                                    irq->u.ext.ext_params,
1117                                    irq->u.ext.ext_params2);
1118
1119         li->irq.ext = irq->u.ext;
1120         set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1121         atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1122         return 0;
1123 }
1124
1125 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1126 {
1127         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1128         struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1129         uint16_t src_id = irq->u.extcall.code;
1130
1131         VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1132                    src_id);
1133         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1134                                    src_id, 0);
1135
1136         /* sending vcpu invalid */
1137         if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
1138                 return -EINVAL;
1139
1140         if (sclp.has_sigpif)
1141                 return sca_inject_ext_call(vcpu, src_id);
1142
1143         if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1144                 return -EBUSY;
1145         *extcall = irq->u.extcall;
1146         atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1147         return 0;
1148 }
1149
1150 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1151 {
1152         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1153         struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1154
1155         VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1156                    irq->u.prefix.address);
1157         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1158                                    irq->u.prefix.address, 0);
1159
1160         if (!is_vcpu_stopped(vcpu))
1161                 return -EBUSY;
1162
1163         *prefix = irq->u.prefix;
1164         set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1165         return 0;
1166 }
1167
1168 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1169 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1170 {
1171         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1172         struct kvm_s390_stop_info *stop = &li->irq.stop;
1173         int rc = 0;
1174
1175         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1176
1177         if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1178                 return -EINVAL;
1179
1180         if (is_vcpu_stopped(vcpu)) {
1181                 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1182                         rc = kvm_s390_store_status_unloaded(vcpu,
1183                                                 KVM_S390_STORE_STATUS_NOADDR);
1184                 return rc;
1185         }
1186
1187         if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1188                 return -EBUSY;
1189         stop->flags = irq->u.stop.flags;
1190         __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
1191         return 0;
1192 }
1193
1194 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1195                                  struct kvm_s390_irq *irq)
1196 {
1197         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1198
1199         VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1200         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1201
1202         set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1203         return 0;
1204 }
1205
1206 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1207                                    struct kvm_s390_irq *irq)
1208 {
1209         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1210
1211         VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1212                    irq->u.emerg.code);
1213         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1214                                    irq->u.emerg.code, 0);
1215
1216         /* sending vcpu invalid */
1217         if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
1218                 return -EINVAL;
1219
1220         set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1221         set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1222         atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1223         return 0;
1224 }
1225
1226 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1227 {
1228         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1229         struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1230
1231         VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1232                    irq->u.mchk.mcic);
1233         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1234                                    irq->u.mchk.mcic);
1235
1236         /*
1237          * Because repressible machine checks can be indicated along with
1238          * exigent machine checks (PoP, Chapter 11, Interruption action)
1239          * we need to combine cr14, mcic and external damage code.
1240          * Failing storage address and the logout area should not be or'ed
1241          * together, we just indicate the last occurrence of the corresponding
1242          * machine check
1243          */
1244         mchk->cr14 |= irq->u.mchk.cr14;
1245         mchk->mcic |= irq->u.mchk.mcic;
1246         mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1247         mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1248         memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1249                sizeof(mchk->fixed_logout));
1250         if (mchk->mcic & MCHK_EX_MASK)
1251                 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1252         else if (mchk->mcic & MCHK_REP_MASK)
1253                 set_bit(IRQ_PEND_MCHK_REP,  &li->pending_irqs);
1254         return 0;
1255 }
1256
1257 static int __inject_ckc(struct kvm_vcpu *vcpu)
1258 {
1259         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1260
1261         VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1262         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1263                                    0, 0);
1264
1265         set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1266         atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1267         return 0;
1268 }
1269
1270 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1271 {
1272         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1273
1274         VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1275         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1276                                    0, 0);
1277
1278         set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1279         atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1280         return 0;
1281 }
1282
1283 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1284                                                   int isc, u32 schid)
1285 {
1286         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1287         struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1288         struct kvm_s390_interrupt_info *iter;
1289         u16 id = (schid & 0xffff0000U) >> 16;
1290         u16 nr = schid & 0x0000ffffU;
1291
1292         spin_lock(&fi->lock);
1293         list_for_each_entry(iter, isc_list, list) {
1294                 if (schid && (id != iter->io.subchannel_id ||
1295                               nr != iter->io.subchannel_nr))
1296                         continue;
1297                 /* found an appropriate entry */
1298                 list_del_init(&iter->list);
1299                 fi->counters[FIRQ_CNTR_IO] -= 1;
1300                 if (list_empty(isc_list))
1301                         clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1302                 spin_unlock(&fi->lock);
1303                 return iter;
1304         }
1305         spin_unlock(&fi->lock);
1306         return NULL;
1307 }
1308
1309 /*
1310  * Dequeue and return an I/O interrupt matching any of the interruption
1311  * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1312  */
1313 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1314                                                     u64 isc_mask, u32 schid)
1315 {
1316         struct kvm_s390_interrupt_info *inti = NULL;
1317         int isc;
1318
1319         for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1320                 if (isc_mask & isc_to_isc_bits(isc))
1321                         inti = get_io_int(kvm, isc, schid);
1322         }
1323         return inti;
1324 }
1325
1326 #define SCCB_MASK 0xFFFFFFF8
1327 #define SCCB_EVENT_PENDING 0x3
1328
1329 static int __inject_service(struct kvm *kvm,
1330                              struct kvm_s390_interrupt_info *inti)
1331 {
1332         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1333
1334         spin_lock(&fi->lock);
1335         fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1336         /*
1337          * Early versions of the QEMU s390 bios will inject several
1338          * service interrupts after another without handling a
1339          * condition code indicating busy.
1340          * We will silently ignore those superfluous sccb values.
1341          * A future version of QEMU will take care of serialization
1342          * of servc requests
1343          */
1344         if (fi->srv_signal.ext_params & SCCB_MASK)
1345                 goto out;
1346         fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1347         set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1348 out:
1349         spin_unlock(&fi->lock);
1350         kfree(inti);
1351         return 0;
1352 }
1353
1354 static int __inject_virtio(struct kvm *kvm,
1355                             struct kvm_s390_interrupt_info *inti)
1356 {
1357         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1358
1359         spin_lock(&fi->lock);
1360         if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1361                 spin_unlock(&fi->lock);
1362                 return -EBUSY;
1363         }
1364         fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1365         list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1366         set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1367         spin_unlock(&fi->lock);
1368         return 0;
1369 }
1370
1371 static int __inject_pfault_done(struct kvm *kvm,
1372                                  struct kvm_s390_interrupt_info *inti)
1373 {
1374         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1375
1376         spin_lock(&fi->lock);
1377         if (fi->counters[FIRQ_CNTR_PFAULT] >=
1378                 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1379                 spin_unlock(&fi->lock);
1380                 return -EBUSY;
1381         }
1382         fi->counters[FIRQ_CNTR_PFAULT] += 1;
1383         list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1384         set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1385         spin_unlock(&fi->lock);
1386         return 0;
1387 }
1388
1389 #define CR_PENDING_SUBCLASS 28
1390 static int __inject_float_mchk(struct kvm *kvm,
1391                                 struct kvm_s390_interrupt_info *inti)
1392 {
1393         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1394
1395         spin_lock(&fi->lock);
1396         fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1397         fi->mchk.mcic |= inti->mchk.mcic;
1398         set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1399         spin_unlock(&fi->lock);
1400         kfree(inti);
1401         return 0;
1402 }
1403
1404 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1405 {
1406         struct kvm_s390_float_interrupt *fi;
1407         struct list_head *list;
1408         int isc;
1409
1410         fi = &kvm->arch.float_int;
1411         spin_lock(&fi->lock);
1412         if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1413                 spin_unlock(&fi->lock);
1414                 return -EBUSY;
1415         }
1416         fi->counters[FIRQ_CNTR_IO] += 1;
1417
1418         isc = int_word_to_isc(inti->io.io_int_word);
1419         list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1420         list_add_tail(&inti->list, list);
1421         set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1422         spin_unlock(&fi->lock);
1423         return 0;
1424 }
1425
1426 /*
1427  * Find a destination VCPU for a floating irq and kick it.
1428  */
1429 static void __floating_irq_kick(struct kvm *kvm, u64 type)
1430 {
1431         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1432         struct kvm_s390_local_interrupt *li;
1433         struct kvm_vcpu *dst_vcpu;
1434         int sigcpu, online_vcpus, nr_tries = 0;
1435
1436         online_vcpus = atomic_read(&kvm->online_vcpus);
1437         if (!online_vcpus)
1438                 return;
1439
1440         /* find idle VCPUs first, then round robin */
1441         sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
1442         if (sigcpu == online_vcpus) {
1443                 do {
1444                         sigcpu = fi->next_rr_cpu;
1445                         fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
1446                         /* avoid endless loops if all vcpus are stopped */
1447                         if (nr_tries++ >= online_vcpus)
1448                                 return;
1449                 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1450         }
1451         dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1452
1453         /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1454         li = &dst_vcpu->arch.local_int;
1455         spin_lock(&li->lock);
1456         switch (type) {
1457         case KVM_S390_MCHK:
1458                 atomic_or(CPUSTAT_STOP_INT, li->cpuflags);
1459                 break;
1460         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1461                 atomic_or(CPUSTAT_IO_INT, li->cpuflags);
1462                 break;
1463         default:
1464                 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1465                 break;
1466         }
1467         spin_unlock(&li->lock);
1468         kvm_s390_vcpu_wakeup(dst_vcpu);
1469 }
1470
1471 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1472 {
1473         u64 type = READ_ONCE(inti->type);
1474         int rc;
1475
1476         switch (type) {
1477         case KVM_S390_MCHK:
1478                 rc = __inject_float_mchk(kvm, inti);
1479                 break;
1480         case KVM_S390_INT_VIRTIO:
1481                 rc = __inject_virtio(kvm, inti);
1482                 break;
1483         case KVM_S390_INT_SERVICE:
1484                 rc = __inject_service(kvm, inti);
1485                 break;
1486         case KVM_S390_INT_PFAULT_DONE:
1487                 rc = __inject_pfault_done(kvm, inti);
1488                 break;
1489         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1490                 rc = __inject_io(kvm, inti);
1491                 break;
1492         default:
1493                 rc = -EINVAL;
1494         }
1495         if (rc)
1496                 return rc;
1497
1498         __floating_irq_kick(kvm, type);
1499         return 0;
1500 }
1501
1502 int kvm_s390_inject_vm(struct kvm *kvm,
1503                        struct kvm_s390_interrupt *s390int)
1504 {
1505         struct kvm_s390_interrupt_info *inti;
1506         int rc;
1507
1508         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1509         if (!inti)
1510                 return -ENOMEM;
1511
1512         inti->type = s390int->type;
1513         switch (inti->type) {
1514         case KVM_S390_INT_VIRTIO:
1515                 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1516                          s390int->parm, s390int->parm64);
1517                 inti->ext.ext_params = s390int->parm;
1518                 inti->ext.ext_params2 = s390int->parm64;
1519                 break;
1520         case KVM_S390_INT_SERVICE:
1521                 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1522                 inti->ext.ext_params = s390int->parm;
1523                 break;
1524         case KVM_S390_INT_PFAULT_DONE:
1525                 inti->ext.ext_params2 = s390int->parm64;
1526                 break;
1527         case KVM_S390_MCHK:
1528                 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1529                          s390int->parm64);
1530                 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1531                 inti->mchk.mcic = s390int->parm64;
1532                 break;
1533         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1534                 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1535                         VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
1536                 else
1537                         VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
1538                                  s390int->type & IOINT_CSSID_MASK,
1539                                  s390int->type & IOINT_SSID_MASK,
1540                                  s390int->type & IOINT_SCHID_MASK);
1541                 inti->io.subchannel_id = s390int->parm >> 16;
1542                 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1543                 inti->io.io_int_parm = s390int->parm64 >> 32;
1544                 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1545                 break;
1546         default:
1547                 kfree(inti);
1548                 return -EINVAL;
1549         }
1550         trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1551                                  2);
1552
1553         rc = __inject_vm(kvm, inti);
1554         if (rc)
1555                 kfree(inti);
1556         return rc;
1557 }
1558
1559 int kvm_s390_reinject_io_int(struct kvm *kvm,
1560                               struct kvm_s390_interrupt_info *inti)
1561 {
1562         return __inject_vm(kvm, inti);
1563 }
1564
1565 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1566                        struct kvm_s390_irq *irq)
1567 {
1568         irq->type = s390int->type;
1569         switch (irq->type) {
1570         case KVM_S390_PROGRAM_INT:
1571                 if (s390int->parm & 0xffff0000)
1572                         return -EINVAL;
1573                 irq->u.pgm.code = s390int->parm;
1574                 break;
1575         case KVM_S390_SIGP_SET_PREFIX:
1576                 irq->u.prefix.address = s390int->parm;
1577                 break;
1578         case KVM_S390_SIGP_STOP:
1579                 irq->u.stop.flags = s390int->parm;
1580                 break;
1581         case KVM_S390_INT_EXTERNAL_CALL:
1582                 if (s390int->parm & 0xffff0000)
1583                         return -EINVAL;
1584                 irq->u.extcall.code = s390int->parm;
1585                 break;
1586         case KVM_S390_INT_EMERGENCY:
1587                 if (s390int->parm & 0xffff0000)
1588                         return -EINVAL;
1589                 irq->u.emerg.code = s390int->parm;
1590                 break;
1591         case KVM_S390_MCHK:
1592                 irq->u.mchk.mcic = s390int->parm64;
1593                 break;
1594         }
1595         return 0;
1596 }
1597
1598 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1599 {
1600         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1601
1602         return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1603 }
1604
1605 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1606 {
1607         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1608
1609         spin_lock(&li->lock);
1610         li->irq.stop.flags = 0;
1611         clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1612         spin_unlock(&li->lock);
1613 }
1614
1615 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1616 {
1617         int rc;
1618
1619         switch (irq->type) {
1620         case KVM_S390_PROGRAM_INT:
1621                 rc = __inject_prog(vcpu, irq);
1622                 break;
1623         case KVM_S390_SIGP_SET_PREFIX:
1624                 rc = __inject_set_prefix(vcpu, irq);
1625                 break;
1626         case KVM_S390_SIGP_STOP:
1627                 rc = __inject_sigp_stop(vcpu, irq);
1628                 break;
1629         case KVM_S390_RESTART:
1630                 rc = __inject_sigp_restart(vcpu, irq);
1631                 break;
1632         case KVM_S390_INT_CLOCK_COMP:
1633                 rc = __inject_ckc(vcpu);
1634                 break;
1635         case KVM_S390_INT_CPU_TIMER:
1636                 rc = __inject_cpu_timer(vcpu);
1637                 break;
1638         case KVM_S390_INT_EXTERNAL_CALL:
1639                 rc = __inject_extcall(vcpu, irq);
1640                 break;
1641         case KVM_S390_INT_EMERGENCY:
1642                 rc = __inject_sigp_emergency(vcpu, irq);
1643                 break;
1644         case KVM_S390_MCHK:
1645                 rc = __inject_mchk(vcpu, irq);
1646                 break;
1647         case KVM_S390_INT_PFAULT_INIT:
1648                 rc = __inject_pfault_init(vcpu, irq);
1649                 break;
1650         case KVM_S390_INT_VIRTIO:
1651         case KVM_S390_INT_SERVICE:
1652         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1653         default:
1654                 rc = -EINVAL;
1655         }
1656
1657         return rc;
1658 }
1659
1660 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1661 {
1662         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1663         int rc;
1664
1665         spin_lock(&li->lock);
1666         rc = do_inject_vcpu(vcpu, irq);
1667         spin_unlock(&li->lock);
1668         if (!rc)
1669                 kvm_s390_vcpu_wakeup(vcpu);
1670         return rc;
1671 }
1672
1673 static inline void clear_irq_list(struct list_head *_list)
1674 {
1675         struct kvm_s390_interrupt_info *inti, *n;
1676
1677         list_for_each_entry_safe(inti, n, _list, list) {
1678                 list_del(&inti->list);
1679                 kfree(inti);
1680         }
1681 }
1682
1683 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1684                        struct kvm_s390_irq *irq)
1685 {
1686         irq->type = inti->type;
1687         switch (inti->type) {
1688         case KVM_S390_INT_PFAULT_INIT:
1689         case KVM_S390_INT_PFAULT_DONE:
1690         case KVM_S390_INT_VIRTIO:
1691                 irq->u.ext = inti->ext;
1692                 break;
1693         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1694                 irq->u.io = inti->io;
1695                 break;
1696         }
1697 }
1698
1699 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1700 {
1701         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1702         int i;
1703
1704         spin_lock(&fi->lock);
1705         fi->pending_irqs = 0;
1706         memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
1707         memset(&fi->mchk, 0, sizeof(fi->mchk));
1708         for (i = 0; i < FIRQ_LIST_COUNT; i++)
1709                 clear_irq_list(&fi->lists[i]);
1710         for (i = 0; i < FIRQ_MAX_COUNT; i++)
1711                 fi->counters[i] = 0;
1712         spin_unlock(&fi->lock);
1713 };
1714
1715 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1716 {
1717         struct kvm_s390_interrupt_info *inti;
1718         struct kvm_s390_float_interrupt *fi;
1719         struct kvm_s390_irq *buf;
1720         struct kvm_s390_irq *irq;
1721         int max_irqs;
1722         int ret = 0;
1723         int n = 0;
1724         int i;
1725
1726         if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
1727                 return -EINVAL;
1728
1729         /*
1730          * We are already using -ENOMEM to signal
1731          * userspace it may retry with a bigger buffer,
1732          * so we need to use something else for this case
1733          */
1734         buf = vzalloc(len);
1735         if (!buf)
1736                 return -ENOBUFS;
1737
1738         max_irqs = len / sizeof(struct kvm_s390_irq);
1739
1740         fi = &kvm->arch.float_int;
1741         spin_lock(&fi->lock);
1742         for (i = 0; i < FIRQ_LIST_COUNT; i++) {
1743                 list_for_each_entry(inti, &fi->lists[i], list) {
1744                         if (n == max_irqs) {
1745                                 /* signal userspace to try again */
1746                                 ret = -ENOMEM;
1747                                 goto out;
1748                         }
1749                         inti_to_irq(inti, &buf[n]);
1750                         n++;
1751                 }
1752         }
1753         if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
1754                 if (n == max_irqs) {
1755                         /* signal userspace to try again */
1756                         ret = -ENOMEM;
1757                         goto out;
1758                 }
1759                 irq = (struct kvm_s390_irq *) &buf[n];
1760                 irq->type = KVM_S390_INT_SERVICE;
1761                 irq->u.ext = fi->srv_signal;
1762                 n++;
1763         }
1764         if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
1765                 if (n == max_irqs) {
1766                                 /* signal userspace to try again */
1767                                 ret = -ENOMEM;
1768                                 goto out;
1769                 }
1770                 irq = (struct kvm_s390_irq *) &buf[n];
1771                 irq->type = KVM_S390_MCHK;
1772                 irq->u.mchk = fi->mchk;
1773                 n++;
1774 }
1775
1776 out:
1777         spin_unlock(&fi->lock);
1778         if (!ret && n > 0) {
1779                 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
1780                         ret = -EFAULT;
1781         }
1782         vfree(buf);
1783
1784         return ret < 0 ? ret : n;
1785 }
1786
1787 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1788 {
1789         int r;
1790
1791         switch (attr->group) {
1792         case KVM_DEV_FLIC_GET_ALL_IRQS:
1793                 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
1794                                           attr->attr);
1795                 break;
1796         default:
1797                 r = -EINVAL;
1798         }
1799
1800         return r;
1801 }
1802
1803 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1804                                      u64 addr)
1805 {
1806         struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1807         void *target = NULL;
1808         void __user *source;
1809         u64 size;
1810
1811         if (get_user(inti->type, (u64 __user *)addr))
1812                 return -EFAULT;
1813
1814         switch (inti->type) {
1815         case KVM_S390_INT_PFAULT_INIT:
1816         case KVM_S390_INT_PFAULT_DONE:
1817         case KVM_S390_INT_VIRTIO:
1818         case KVM_S390_INT_SERVICE:
1819                 target = (void *) &inti->ext;
1820                 source = &uptr->u.ext;
1821                 size = sizeof(inti->ext);
1822                 break;
1823         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1824                 target = (void *) &inti->io;
1825                 source = &uptr->u.io;
1826                 size = sizeof(inti->io);
1827                 break;
1828         case KVM_S390_MCHK:
1829                 target = (void *) &inti->mchk;
1830                 source = &uptr->u.mchk;
1831                 size = sizeof(inti->mchk);
1832                 break;
1833         default:
1834                 return -EINVAL;
1835         }
1836
1837         if (copy_from_user(target, source, size))
1838                 return -EFAULT;
1839
1840         return 0;
1841 }
1842
1843 static int enqueue_floating_irq(struct kvm_device *dev,
1844                                 struct kvm_device_attr *attr)
1845 {
1846         struct kvm_s390_interrupt_info *inti = NULL;
1847         int r = 0;
1848         int len = attr->attr;
1849
1850         if (len % sizeof(struct kvm_s390_irq) != 0)
1851                 return -EINVAL;
1852         else if (len > KVM_S390_FLIC_MAX_BUFFER)
1853                 return -EINVAL;
1854
1855         while (len >= sizeof(struct kvm_s390_irq)) {
1856                 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1857                 if (!inti)
1858                         return -ENOMEM;
1859
1860                 r = copy_irq_from_user(inti, attr->addr);
1861                 if (r) {
1862                         kfree(inti);
1863                         return r;
1864                 }
1865                 r = __inject_vm(dev->kvm, inti);
1866                 if (r) {
1867                         kfree(inti);
1868                         return r;
1869                 }
1870                 len -= sizeof(struct kvm_s390_irq);
1871                 attr->addr += sizeof(struct kvm_s390_irq);
1872         }
1873
1874         return r;
1875 }
1876
1877 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1878 {
1879         if (id >= MAX_S390_IO_ADAPTERS)
1880                 return NULL;
1881         return kvm->arch.adapters[id];
1882 }
1883
1884 static int register_io_adapter(struct kvm_device *dev,
1885                                struct kvm_device_attr *attr)
1886 {
1887         struct s390_io_adapter *adapter;
1888         struct kvm_s390_io_adapter adapter_info;
1889
1890         if (copy_from_user(&adapter_info,
1891                            (void __user *)attr->addr, sizeof(adapter_info)))
1892                 return -EFAULT;
1893
1894         if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1895             (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1896                 return -EINVAL;
1897
1898         adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1899         if (!adapter)
1900                 return -ENOMEM;
1901
1902         INIT_LIST_HEAD(&adapter->maps);
1903         init_rwsem(&adapter->maps_lock);
1904         atomic_set(&adapter->nr_maps, 0);
1905         adapter->id = adapter_info.id;
1906         adapter->isc = adapter_info.isc;
1907         adapter->maskable = adapter_info.maskable;
1908         adapter->masked = false;
1909         adapter->swap = adapter_info.swap;
1910         dev->kvm->arch.adapters[adapter->id] = adapter;
1911
1912         return 0;
1913 }
1914
1915 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1916 {
1917         int ret;
1918         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1919
1920         if (!adapter || !adapter->maskable)
1921                 return -EINVAL;
1922         ret = adapter->masked;
1923         adapter->masked = masked;
1924         return ret;
1925 }
1926
1927 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1928 {
1929         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1930         struct s390_map_info *map;
1931         int ret;
1932
1933         if (!adapter || !addr)
1934                 return -EINVAL;
1935
1936         map = kzalloc(sizeof(*map), GFP_KERNEL);
1937         if (!map) {
1938                 ret = -ENOMEM;
1939                 goto out;
1940         }
1941         INIT_LIST_HEAD(&map->list);
1942         map->guest_addr = addr;
1943         map->addr = gmap_translate(kvm->arch.gmap, addr);
1944         if (map->addr == -EFAULT) {
1945                 ret = -EFAULT;
1946                 goto out;
1947         }
1948         ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1949         if (ret < 0)
1950                 goto out;
1951         BUG_ON(ret != 1);
1952         down_write(&adapter->maps_lock);
1953         if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1954                 list_add_tail(&map->list, &adapter->maps);
1955                 ret = 0;
1956         } else {
1957                 put_page(map->page);
1958                 ret = -EINVAL;
1959         }
1960         up_write(&adapter->maps_lock);
1961 out:
1962         if (ret)
1963                 kfree(map);
1964         return ret;
1965 }
1966
1967 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1968 {
1969         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1970         struct s390_map_info *map, *tmp;
1971         int found = 0;
1972
1973         if (!adapter || !addr)
1974                 return -EINVAL;
1975
1976         down_write(&adapter->maps_lock);
1977         list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1978                 if (map->guest_addr == addr) {
1979                         found = 1;
1980                         atomic_dec(&adapter->nr_maps);
1981                         list_del(&map->list);
1982                         put_page(map->page);
1983                         kfree(map);
1984                         break;
1985                 }
1986         }
1987         up_write(&adapter->maps_lock);
1988
1989         return found ? 0 : -EINVAL;
1990 }
1991
1992 void kvm_s390_destroy_adapters(struct kvm *kvm)
1993 {
1994         int i;
1995         struct s390_map_info *map, *tmp;
1996
1997         for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
1998                 if (!kvm->arch.adapters[i])
1999                         continue;
2000                 list_for_each_entry_safe(map, tmp,
2001                                          &kvm->arch.adapters[i]->maps, list) {
2002                         list_del(&map->list);
2003                         put_page(map->page);
2004                         kfree(map);
2005                 }
2006                 kfree(kvm->arch.adapters[i]);
2007         }
2008 }
2009
2010 static int modify_io_adapter(struct kvm_device *dev,
2011                              struct kvm_device_attr *attr)
2012 {
2013         struct kvm_s390_io_adapter_req req;
2014         struct s390_io_adapter *adapter;
2015         int ret;
2016
2017         if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2018                 return -EFAULT;
2019
2020         adapter = get_io_adapter(dev->kvm, req.id);
2021         if (!adapter)
2022                 return -EINVAL;
2023         switch (req.type) {
2024         case KVM_S390_IO_ADAPTER_MASK:
2025                 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
2026                 if (ret > 0)
2027                         ret = 0;
2028                 break;
2029         case KVM_S390_IO_ADAPTER_MAP:
2030                 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
2031                 break;
2032         case KVM_S390_IO_ADAPTER_UNMAP:
2033                 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
2034                 break;
2035         default:
2036                 ret = -EINVAL;
2037         }
2038
2039         return ret;
2040 }
2041
2042 static int clear_io_irq(struct kvm *kvm, struct kvm_device_attr *attr)
2043
2044 {
2045         const u64 isc_mask = 0xffUL << 24; /* all iscs set */
2046         u32 schid;
2047
2048         if (attr->flags)
2049                 return -EINVAL;
2050         if (attr->attr != sizeof(schid))
2051                 return -EINVAL;
2052         if (copy_from_user(&schid, (void __user *) attr->addr, sizeof(schid)))
2053                 return -EFAULT;
2054         kfree(kvm_s390_get_io_int(kvm, isc_mask, schid));
2055         /*
2056          * If userspace is conforming to the architecture, we can have at most
2057          * one pending I/O interrupt per subchannel, so this is effectively a
2058          * clear all.
2059          */
2060         return 0;
2061 }
2062
2063 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2064 {
2065         int r = 0;
2066         unsigned int i;
2067         struct kvm_vcpu *vcpu;
2068
2069         switch (attr->group) {
2070         case KVM_DEV_FLIC_ENQUEUE:
2071                 r = enqueue_floating_irq(dev, attr);
2072                 break;
2073         case KVM_DEV_FLIC_CLEAR_IRQS:
2074                 kvm_s390_clear_float_irqs(dev->kvm);
2075                 break;
2076         case KVM_DEV_FLIC_APF_ENABLE:
2077                 dev->kvm->arch.gmap->pfault_enabled = 1;
2078                 break;
2079         case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2080                 dev->kvm->arch.gmap->pfault_enabled = 0;
2081                 /*
2082                  * Make sure no async faults are in transition when
2083                  * clearing the queues. So we don't need to worry
2084                  * about late coming workers.
2085                  */
2086                 synchronize_srcu(&dev->kvm->srcu);
2087                 kvm_for_each_vcpu(i, vcpu, dev->kvm)
2088                         kvm_clear_async_pf_completion_queue(vcpu);
2089                 break;
2090         case KVM_DEV_FLIC_ADAPTER_REGISTER:
2091                 r = register_io_adapter(dev, attr);
2092                 break;
2093         case KVM_DEV_FLIC_ADAPTER_MODIFY:
2094                 r = modify_io_adapter(dev, attr);
2095                 break;
2096         case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2097                 r = clear_io_irq(dev->kvm, attr);
2098                 break;
2099         default:
2100                 r = -EINVAL;
2101         }
2102
2103         return r;
2104 }
2105
2106 static int flic_has_attr(struct kvm_device *dev,
2107                              struct kvm_device_attr *attr)
2108 {
2109         switch (attr->group) {
2110         case KVM_DEV_FLIC_GET_ALL_IRQS:
2111         case KVM_DEV_FLIC_ENQUEUE:
2112         case KVM_DEV_FLIC_CLEAR_IRQS:
2113         case KVM_DEV_FLIC_APF_ENABLE:
2114         case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2115         case KVM_DEV_FLIC_ADAPTER_REGISTER:
2116         case KVM_DEV_FLIC_ADAPTER_MODIFY:
2117         case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2118                 return 0;
2119         }
2120         return -ENXIO;
2121 }
2122
2123 static int flic_create(struct kvm_device *dev, u32 type)
2124 {
2125         if (!dev)
2126                 return -EINVAL;
2127         if (dev->kvm->arch.flic)
2128                 return -EINVAL;
2129         dev->kvm->arch.flic = dev;
2130         return 0;
2131 }
2132
2133 static void flic_destroy(struct kvm_device *dev)
2134 {
2135         dev->kvm->arch.flic = NULL;
2136         kfree(dev);
2137 }
2138
2139 /* s390 floating irq controller (flic) */
2140 struct kvm_device_ops kvm_flic_ops = {
2141         .name = "kvm-flic",
2142         .get_attr = flic_get_attr,
2143         .set_attr = flic_set_attr,
2144         .has_attr = flic_has_attr,
2145         .create = flic_create,
2146         .destroy = flic_destroy,
2147 };
2148
2149 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2150 {
2151         unsigned long bit;
2152
2153         bit = bit_nr + (addr % PAGE_SIZE) * 8;
2154
2155         return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2156 }
2157
2158 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2159                                           u64 addr)
2160 {
2161         struct s390_map_info *map;
2162
2163         if (!adapter)
2164                 return NULL;
2165
2166         list_for_each_entry(map, &adapter->maps, list) {
2167                 if (map->guest_addr == addr)
2168                         return map;
2169         }
2170         return NULL;
2171 }
2172
2173 static int adapter_indicators_set(struct kvm *kvm,
2174                                   struct s390_io_adapter *adapter,
2175                                   struct kvm_s390_adapter_int *adapter_int)
2176 {
2177         unsigned long bit;
2178         int summary_set, idx;
2179         struct s390_map_info *info;
2180         void *map;
2181
2182         info = get_map_info(adapter, adapter_int->ind_addr);
2183         if (!info)
2184                 return -1;
2185         map = page_address(info->page);
2186         bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2187         set_bit(bit, map);
2188         idx = srcu_read_lock(&kvm->srcu);
2189         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2190         set_page_dirty_lock(info->page);
2191         info = get_map_info(adapter, adapter_int->summary_addr);
2192         if (!info) {
2193                 srcu_read_unlock(&kvm->srcu, idx);
2194                 return -1;
2195         }
2196         map = page_address(info->page);
2197         bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2198                           adapter->swap);
2199         summary_set = test_and_set_bit(bit, map);
2200         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2201         set_page_dirty_lock(info->page);
2202         srcu_read_unlock(&kvm->srcu, idx);
2203         return summary_set ? 0 : 1;
2204 }
2205
2206 /*
2207  * < 0 - not injected due to error
2208  * = 0 - coalesced, summary indicator already active
2209  * > 0 - injected interrupt
2210  */
2211 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2212                            struct kvm *kvm, int irq_source_id, int level,
2213                            bool line_status)
2214 {
2215         int ret;
2216         struct s390_io_adapter *adapter;
2217
2218         /* We're only interested in the 0->1 transition. */
2219         if (!level)
2220                 return 0;
2221         adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2222         if (!adapter)
2223                 return -1;
2224         down_read(&adapter->maps_lock);
2225         ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2226         up_read(&adapter->maps_lock);
2227         if ((ret > 0) && !adapter->masked) {
2228                 struct kvm_s390_interrupt s390int = {
2229                         .type = KVM_S390_INT_IO(1, 0, 0, 0),
2230                         .parm = 0,
2231                         .parm64 = (adapter->isc << 27) | 0x80000000,
2232                 };
2233                 ret = kvm_s390_inject_vm(kvm, &s390int);
2234                 if (ret == 0)
2235                         ret = 1;
2236         }
2237         return ret;
2238 }
2239
2240 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
2241                           const struct kvm_irq_routing_entry *ue)
2242 {
2243         int ret;
2244
2245         switch (ue->type) {
2246         case KVM_IRQ_ROUTING_S390_ADAPTER:
2247                 e->set = set_adapter_int;
2248                 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2249                 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2250                 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2251                 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2252                 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2253                 ret = 0;
2254                 break;
2255         default:
2256                 ret = -EINVAL;
2257         }
2258
2259         return ret;
2260 }
2261
2262 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2263                 int irq_source_id, int level, bool line_status)
2264 {
2265         return -EINVAL;
2266 }
2267
2268 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2269 {
2270         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2271         struct kvm_s390_irq *buf;
2272         int r = 0;
2273         int n;
2274
2275         buf = vmalloc(len);
2276         if (!buf)
2277                 return -ENOMEM;
2278
2279         if (copy_from_user((void *) buf, irqstate, len)) {
2280                 r = -EFAULT;
2281                 goto out_free;
2282         }
2283
2284         /*
2285          * Don't allow setting the interrupt state
2286          * when there are already interrupts pending
2287          */
2288         spin_lock(&li->lock);
2289         if (li->pending_irqs) {
2290                 r = -EBUSY;
2291                 goto out_unlock;
2292         }
2293
2294         for (n = 0; n < len / sizeof(*buf); n++) {
2295                 r = do_inject_vcpu(vcpu, &buf[n]);
2296                 if (r)
2297                         break;
2298         }
2299
2300 out_unlock:
2301         spin_unlock(&li->lock);
2302 out_free:
2303         vfree(buf);
2304
2305         return r;
2306 }
2307
2308 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2309                             struct kvm_s390_irq *irq,
2310                             unsigned long irq_type)
2311 {
2312         switch (irq_type) {
2313         case IRQ_PEND_MCHK_EX:
2314         case IRQ_PEND_MCHK_REP:
2315                 irq->type = KVM_S390_MCHK;
2316                 irq->u.mchk = li->irq.mchk;
2317                 break;
2318         case IRQ_PEND_PROG:
2319                 irq->type = KVM_S390_PROGRAM_INT;
2320                 irq->u.pgm = li->irq.pgm;
2321                 break;
2322         case IRQ_PEND_PFAULT_INIT:
2323                 irq->type = KVM_S390_INT_PFAULT_INIT;
2324                 irq->u.ext = li->irq.ext;
2325                 break;
2326         case IRQ_PEND_EXT_EXTERNAL:
2327                 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2328                 irq->u.extcall = li->irq.extcall;
2329                 break;
2330         case IRQ_PEND_EXT_CLOCK_COMP:
2331                 irq->type = KVM_S390_INT_CLOCK_COMP;
2332                 break;
2333         case IRQ_PEND_EXT_CPU_TIMER:
2334                 irq->type = KVM_S390_INT_CPU_TIMER;
2335                 break;
2336         case IRQ_PEND_SIGP_STOP:
2337                 irq->type = KVM_S390_SIGP_STOP;
2338                 irq->u.stop = li->irq.stop;
2339                 break;
2340         case IRQ_PEND_RESTART:
2341                 irq->type = KVM_S390_RESTART;
2342                 break;
2343         case IRQ_PEND_SET_PREFIX:
2344                 irq->type = KVM_S390_SIGP_SET_PREFIX;
2345                 irq->u.prefix = li->irq.prefix;
2346                 break;
2347         }
2348 }
2349
2350 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2351 {
2352         int scn;
2353         unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2354         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2355         unsigned long pending_irqs;
2356         struct kvm_s390_irq irq;
2357         unsigned long irq_type;
2358         int cpuaddr;
2359         int n = 0;
2360
2361         spin_lock(&li->lock);
2362         pending_irqs = li->pending_irqs;
2363         memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2364                sizeof(sigp_emerg_pending));
2365         spin_unlock(&li->lock);
2366
2367         for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2368                 memset(&irq, 0, sizeof(irq));
2369                 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2370                         continue;
2371                 if (n + sizeof(irq) > len)
2372                         return -ENOBUFS;
2373                 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2374                 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2375                         return -EFAULT;
2376                 n += sizeof(irq);
2377         }
2378
2379         if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2380                 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2381                         memset(&irq, 0, sizeof(irq));
2382                         if (n + sizeof(irq) > len)
2383                                 return -ENOBUFS;
2384                         irq.type = KVM_S390_INT_EMERGENCY;
2385                         irq.u.emerg.code = cpuaddr;
2386                         if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2387                                 return -EFAULT;
2388                         n += sizeof(irq);
2389                 }
2390         }
2391
2392         if (sca_ext_call_pending(vcpu, &scn)) {
2393                 if (n + sizeof(irq) > len)
2394                         return -ENOBUFS;
2395                 memset(&irq, 0, sizeof(irq));
2396                 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2397                 irq.u.extcall.code = scn;
2398                 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2399                         return -EFAULT;
2400                 n += sizeof(irq);
2401         }
2402
2403         return n;
2404 }