arch/s390/kvm/kvm-s390.c

   1 /*
   2  * hosting zSeries kernel virtual machines
   3  *
   4  * Copyright IBM Corp. 2008, 2009
   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  *               Christian Borntraeger <borntraeger@de.ibm.com>
  12  *               Heiko Carstens <heiko.carstens@de.ibm.com>
  13  *               Christian Ehrhardt <ehrhardt@de.ibm.com>
  14  *               Jason J. Herne <jjherne@us.ibm.com>
  15  */
  16
  17 #include <linux/compiler.h>
  18 #include <linux/err.h>
  19 #include <linux/fs.h>
  20 #include <linux/hrtimer.h>
  21 #include <linux/init.h>
  22 #include <linux/kvm.h>
  23 #include <linux/kvm_host.h>
  24 #include <linux/mman.h>
  25 #include <linux/module.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/random.h>
  28 #include <linux/slab.h>
  29 #include <linux/timer.h>
  30 #include <linux/vmalloc.h>
  31 #include <linux/bitmap.h>
  32 #include <linux/sched/signal.h>
  33 #include <linux/string.h>
  34
  35 #include <asm/asm-offsets.h>
  36 #include <asm/lowcore.h>
  37 #include <asm/stp.h>
  38 #include <asm/pgtable.h>
  39 #include <asm/gmap.h>
  40 #include <asm/nmi.h>
  41 #include <asm/switch_to.h>
  42 #include <asm/isc.h>
  43 #include <asm/sclp.h>
  44 #include <asm/cpacf.h>
  45 #include <asm/timex.h>
  46 #include "kvm-s390.h"
  47 #include "gaccess.h"
  48
  49 #define KMSG_COMPONENT "kvm-s390"
  50 #undef pr_fmt
  51 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  52
  53 #define CREATE_TRACE_POINTS
  54 #include "trace.h"
  55 #include "trace-s390.h"
  56
  57 #define MEM_OP_MAX_SIZE 65536   /* Maximum transfer size for KVM_S390_MEM_OP */
  58 #define LOCAL_IRQS 32
  59 #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
  60                            (KVM_MAX_VCPUS + LOCAL_IRQS))
  61
  62 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
  63
  64 struct kvm_stats_debugfs_item debugfs_entries[] = {
  65         { "userspace_handled", VCPU_STAT(exit_userspace) },
  66         { "exit_null", VCPU_STAT(exit_null) },
  67         { "exit_validity", VCPU_STAT(exit_validity) },
  68         { "exit_stop_request", VCPU_STAT(exit_stop_request) },
  69         { "exit_external_request", VCPU_STAT(exit_external_request) },
  70         { "exit_external_interrupt", VCPU_STAT(exit_external_interrupt) },
  71         { "exit_instruction", VCPU_STAT(exit_instruction) },
  72         { "exit_pei", VCPU_STAT(exit_pei) },
  73         { "exit_program_interruption", VCPU_STAT(exit_program_interruption) },
  74         { "exit_instr_and_program_int", VCPU_STAT(exit_instr_and_program) },
  75         { "exit_operation_exception", VCPU_STAT(exit_operation_exception) },
  76         { "halt_successful_poll", VCPU_STAT(halt_successful_poll) },
  77         { "halt_attempted_poll", VCPU_STAT(halt_attempted_poll) },
  78         { "halt_poll_invalid", VCPU_STAT(halt_poll_invalid) },
  79         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
  80         { "instruction_lctlg", VCPU_STAT(instruction_lctlg) },
  81         { "instruction_lctl", VCPU_STAT(instruction_lctl) },
  82         { "instruction_stctl", VCPU_STAT(instruction_stctl) },
  83         { "instruction_stctg", VCPU_STAT(instruction_stctg) },
  84         { "deliver_emergency_signal", VCPU_STAT(deliver_emergency_signal) },
  85         { "deliver_external_call", VCPU_STAT(deliver_external_call) },
  86         { "deliver_service_signal", VCPU_STAT(deliver_service_signal) },
  87         { "deliver_virtio_interrupt", VCPU_STAT(deliver_virtio_interrupt) },
  88         { "deliver_stop_signal", VCPU_STAT(deliver_stop_signal) },
  89         { "deliver_prefix_signal", VCPU_STAT(deliver_prefix_signal) },
  90         { "deliver_restart_signal", VCPU_STAT(deliver_restart_signal) },
  91         { "deliver_program_interruption", VCPU_STAT(deliver_program_int) },
  92         { "exit_wait_state", VCPU_STAT(exit_wait_state) },
  93         { "instruction_pfmf", VCPU_STAT(instruction_pfmf) },
  94         { "instruction_stidp", VCPU_STAT(instruction_stidp) },
  95         { "instruction_spx", VCPU_STAT(instruction_spx) },
  96         { "instruction_stpx", VCPU_STAT(instruction_stpx) },
  97         { "instruction_stap", VCPU_STAT(instruction_stap) },
  98         { "instruction_storage_key", VCPU_STAT(instruction_storage_key) },
  99         { "instruction_ipte_interlock", VCPU_STAT(instruction_ipte_interlock) },
 100         { "instruction_stsch", VCPU_STAT(instruction_stsch) },
 101         { "instruction_chsc", VCPU_STAT(instruction_chsc) },
 102         { "instruction_essa", VCPU_STAT(instruction_essa) },
 103         { "instruction_stsi", VCPU_STAT(instruction_stsi) },
 104         { "instruction_stfl", VCPU_STAT(instruction_stfl) },
 105         { "instruction_tprot", VCPU_STAT(instruction_tprot) },
 106         { "instruction_sthyi", VCPU_STAT(instruction_sthyi) },
 107         { "instruction_sie", VCPU_STAT(instruction_sie) },
 108         { "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) },
 109         { "instruction_sigp_sense_running", VCPU_STAT(instruction_sigp_sense_running) },
 110         { "instruction_sigp_external_call", VCPU_STAT(instruction_sigp_external_call) },
 111         { "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) },
 112         { "instruction_sigp_cond_emergency", VCPU_STAT(instruction_sigp_cond_emergency) },
 113         { "instruction_sigp_start", VCPU_STAT(instruction_sigp_start) },
 114         { "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) },
 115         { "instruction_sigp_stop_store_status", VCPU_STAT(instruction_sigp_stop_store_status) },
 116         { "instruction_sigp_store_status", VCPU_STAT(instruction_sigp_store_status) },
 117         { "instruction_sigp_store_adtl_status", VCPU_STAT(instruction_sigp_store_adtl_status) },
 118         { "instruction_sigp_set_arch", VCPU_STAT(instruction_sigp_arch) },
 119         { "instruction_sigp_set_prefix", VCPU_STAT(instruction_sigp_prefix) },
 120         { "instruction_sigp_restart", VCPU_STAT(instruction_sigp_restart) },
 121         { "instruction_sigp_cpu_reset", VCPU_STAT(instruction_sigp_cpu_reset) },
 122         { "instruction_sigp_init_cpu_reset", VCPU_STAT(instruction_sigp_init_cpu_reset) },
 123         { "instruction_sigp_unknown", VCPU_STAT(instruction_sigp_unknown) },
 124         { "diagnose_10", VCPU_STAT(diagnose_10) },
 125         { "diagnose_44", VCPU_STAT(diagnose_44) },
 126         { "diagnose_9c", VCPU_STAT(diagnose_9c) },
 127         { "diagnose_258", VCPU_STAT(diagnose_258) },
 128         { "diagnose_308", VCPU_STAT(diagnose_308) },
 129         { "diagnose_500", VCPU_STAT(diagnose_500) },
 130         { NULL }
 131 };
 132
 133 struct kvm_s390_tod_clock_ext {
 134         __u8 epoch_idx;
 135         __u64 tod;
 136         __u8 reserved[7];
 137 } __packed;
 138
 139 /* allow nested virtualization in KVM (if enabled by user space) */
 140 static int nested;
 141 module_param(nested, int, S_IRUGO);
 142 MODULE_PARM_DESC(nested, "Nested virtualization support");
 143
 144 /* upper facilities limit for kvm */
 145 unsigned long kvm_s390_fac_list_mask[16] = { FACILITIES_KVM };
 146
 147 unsigned long kvm_s390_fac_list_mask_size(void)
 148 {
 149         BUILD_BUG_ON(ARRAY_SIZE(kvm_s390_fac_list_mask) > S390_ARCH_FAC_MASK_SIZE_U64);
 150         return ARRAY_SIZE(kvm_s390_fac_list_mask);
 151 }
 152
 153 /* available cpu features supported by kvm */
 154 static DECLARE_BITMAP(kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
 155 /* available subfunctions indicated via query / "test bit" */
 156 static struct kvm_s390_vm_cpu_subfunc kvm_s390_available_subfunc;
 157
 158 static struct gmap_notifier gmap_notifier;
 159 static struct gmap_notifier vsie_gmap_notifier;
 160 debug_info_t *kvm_s390_dbf;
 161
 162 /* Section: not file related */
 163 int kvm_arch_hardware_enable(void)
 164 {
 165         /* every s390 is virtualization enabled ;-) */
 166         return 0;
 167 }
 168
 169 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
 170                               unsigned long end);
 171
 172 /*
 173  * This callback is executed during stop_machine(). All CPUs are therefore
 174  * temporarily stopped. In order not to change guest behavior, we have to
 175  * disable preemption whenever we touch the epoch of kvm and the VCPUs,
 176  * so a CPU won't be stopped while calculating with the epoch.
 177  */
 178 static int kvm_clock_sync(struct notifier_block *notifier, unsigned long val,
 179                           void *v)
 180 {
 181         struct kvm *kvm;
 182         struct kvm_vcpu *vcpu;
 183         int i;
 184         unsigned long long *delta = v;
 185
 186         list_for_each_entry(kvm, &vm_list, vm_list) {
 187                 kvm->arch.epoch -= *delta;
 188                 kvm_for_each_vcpu(i, vcpu, kvm) {
 189                         vcpu->arch.sie_block->epoch -= *delta;
 190                         if (vcpu->arch.cputm_enabled)
 191                                 vcpu->arch.cputm_start += *delta;
 192                         if (vcpu->arch.vsie_block)
 193                                 vcpu->arch.vsie_block->epoch -= *delta;
 194                 }
 195         }
 196         return NOTIFY_OK;
 197 }
 198
 199 static struct notifier_block kvm_clock_notifier = {
 200         .notifier_call = kvm_clock_sync,
 201 };
 202
 203 int kvm_arch_hardware_setup(void)
 204 {
 205         gmap_notifier.notifier_call = kvm_gmap_notifier;
 206         gmap_register_pte_notifier(&gmap_notifier);
 207         vsie_gmap_notifier.notifier_call = kvm_s390_vsie_gmap_notifier;
 208         gmap_register_pte_notifier(&vsie_gmap_notifier);
 209         atomic_notifier_chain_register(&s390_epoch_delta_notifier,
 210                                        &kvm_clock_notifier);
 211         return 0;
 212 }
 213
 214 void kvm_arch_hardware_unsetup(void)
 215 {
 216         gmap_unregister_pte_notifier(&gmap_notifier);
 217         gmap_unregister_pte_notifier(&vsie_gmap_notifier);
 218         atomic_notifier_chain_unregister(&s390_epoch_delta_notifier,
 219                                          &kvm_clock_notifier);
 220 }
 221
 222 static void allow_cpu_feat(unsigned long nr)
 223 {
 224         set_bit_inv(nr, kvm_s390_available_cpu_feat);
 225 }
 226
 227 static inline int plo_test_bit(unsigned char nr)
 228 {
 229         register unsigned long r0 asm("0") = (unsigned long) nr | 0x100;
 230         int cc;
 231
 232         asm volatile(
 233                 /* Parameter registers are ignored for "test bit" */
 234                 "       plo     0,0,0,0(0)\n"
 235                 "       ipm     %0\n"
 236                 "       srl     %0,28\n"
 237                 : "=d" (cc)
 238                 : "d" (r0)
 239                 : "cc");
 240         return cc == 0;
 241 }
 242
 243 static void kvm_s390_cpu_feat_init(void)
 244 {
 245         int i;
 246
 247         for (i = 0; i < 256; ++i) {
 248                 if (plo_test_bit(i))
 249                         kvm_s390_available_subfunc.plo[i >> 3] |= 0x80 >> (i & 7);
 250         }
 251
 252         if (test_facility(28)) /* TOD-clock steering */
 253                 ptff(kvm_s390_available_subfunc.ptff,
 254                      sizeof(kvm_s390_available_subfunc.ptff),
 255                      PTFF_QAF);
 256
 257         if (test_facility(17)) { /* MSA */
 258                 __cpacf_query(CPACF_KMAC, (cpacf_mask_t *)
 259                               kvm_s390_available_subfunc.kmac);
 260                 __cpacf_query(CPACF_KMC, (cpacf_mask_t *)
 261                               kvm_s390_available_subfunc.kmc);
 262                 __cpacf_query(CPACF_KM, (cpacf_mask_t *)
 263                               kvm_s390_available_subfunc.km);
 264                 __cpacf_query(CPACF_KIMD, (cpacf_mask_t *)
 265                               kvm_s390_available_subfunc.kimd);
 266                 __cpacf_query(CPACF_KLMD, (cpacf_mask_t *)
 267                               kvm_s390_available_subfunc.klmd);
 268         }
 269         if (test_facility(76)) /* MSA3 */
 270                 __cpacf_query(CPACF_PCKMO, (cpacf_mask_t *)
 271                               kvm_s390_available_subfunc.pckmo);
 272         if (test_facility(77)) { /* MSA4 */
 273                 __cpacf_query(CPACF_KMCTR, (cpacf_mask_t *)
 274                               kvm_s390_available_subfunc.kmctr);
 275                 __cpacf_query(CPACF_KMF, (cpacf_mask_t *)
 276                               kvm_s390_available_subfunc.kmf);
 277                 __cpacf_query(CPACF_KMO, (cpacf_mask_t *)
 278                               kvm_s390_available_subfunc.kmo);
 279                 __cpacf_query(CPACF_PCC, (cpacf_mask_t *)
 280                               kvm_s390_available_subfunc.pcc);
 281         }
 282         if (test_facility(57)) /* MSA5 */
 283                 __cpacf_query(CPACF_PRNO, (cpacf_mask_t *)
 284                               kvm_s390_available_subfunc.ppno);
 285
 286         if (test_facility(146)) /* MSA8 */
 287                 __cpacf_query(CPACF_KMA, (cpacf_mask_t *)
 288                               kvm_s390_available_subfunc.kma);
 289
 290         if (MACHINE_HAS_ESOP)
 291                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP);
 292         /*
 293          * We need SIE support, ESOP (PROT_READ protection for gmap_shadow),
 294          * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing).
 295          */
 296         if (!sclp.has_sief2 || !MACHINE_HAS_ESOP || !sclp.has_64bscao ||
 297             !test_facility(3) || !nested)
 298                 return;
 299         allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2);
 300         if (sclp.has_64bscao)
 301                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO);
 302         if (sclp.has_siif)
 303                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF);
 304         if (sclp.has_gpere)
 305                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GPERE);
 306         if (sclp.has_gsls)
 307                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GSLS);
 308         if (sclp.has_ib)
 309                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IB);
 310         if (sclp.has_cei)
 311                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_CEI);
 312         if (sclp.has_ibs)
 313                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IBS);
 314         if (sclp.has_kss)
 315                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_KSS);
 316         /*
 317          * KVM_S390_VM_CPU_FEAT_SKEY: Wrong shadow of PTE.I bits will make
 318          * all skey handling functions read/set the skey from the PGSTE
 319          * instead of the real storage key.
 320          *
 321          * KVM_S390_VM_CPU_FEAT_CMMA: Wrong shadow of PTE.I bits will make
 322          * pages being detected as preserved although they are resident.
 323          *
 324          * KVM_S390_VM_CPU_FEAT_PFMFI: Wrong shadow of PTE.I bits will
 325          * have the same effect as for KVM_S390_VM_CPU_FEAT_SKEY.
 326          *
 327          * For KVM_S390_VM_CPU_FEAT_SKEY, KVM_S390_VM_CPU_FEAT_CMMA and
 328          * KVM_S390_VM_CPU_FEAT_PFMFI, all PTE.I and PGSTE bits have to be
 329          * correctly shadowed. We can do that for the PGSTE but not for PTE.I.
 330          *
 331          * KVM_S390_VM_CPU_FEAT_SIGPIF: Wrong SCB addresses in the SCA. We
 332          * cannot easily shadow the SCA because of the ipte lock.
 333          */
 334 }
 335
 336 int kvm_arch_init(void *opaque)
 337 {
 338         kvm_s390_dbf = debug_register("kvm-trace", 32, 1, 7 * sizeof(long));
 339         if (!kvm_s390_dbf)
 340                 return -ENOMEM;
 341
 342         if (debug_register_view(kvm_s390_dbf, &debug_sprintf_view)) {
 343                 debug_unregister(kvm_s390_dbf);
 344                 return -ENOMEM;
 345         }
 346
 347         kvm_s390_cpu_feat_init();
 348
 349         /* Register floating interrupt controller interface. */
 350         return kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC);
 351 }
 352
 353 void kvm_arch_exit(void)
 354 {
 355         debug_unregister(kvm_s390_dbf);
 356 }
 357
 358 /* Section: device related */
 359 long kvm_arch_dev_ioctl(struct file *filp,
 360                         unsigned int ioctl, unsigned long arg)
 361 {
 362         if (ioctl == KVM_S390_ENABLE_SIE)
 363                 return s390_enable_sie();
 364         return -EINVAL;
 365 }
 366
 367 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 368 {
 369         int r;
 370
 371         switch (ext) {
 372         case KVM_CAP_S390_PSW:
 373         case KVM_CAP_S390_GMAP:
 374         case KVM_CAP_SYNC_MMU:
 375 #ifdef CONFIG_KVM_S390_UCONTROL
 376         case KVM_CAP_S390_UCONTROL:
 377 #endif
 378         case KVM_CAP_ASYNC_PF:
 379         case KVM_CAP_SYNC_REGS:
 380         case KVM_CAP_ONE_REG:
 381         case KVM_CAP_ENABLE_CAP:
 382         case KVM_CAP_S390_CSS_SUPPORT:
 383         case KVM_CAP_IOEVENTFD:
 384         case KVM_CAP_DEVICE_CTRL:
 385         case KVM_CAP_ENABLE_CAP_VM:
 386         case KVM_CAP_S390_IRQCHIP:
 387         case KVM_CAP_VM_ATTRIBUTES:
 388         case KVM_CAP_MP_STATE:
 389         case KVM_CAP_IMMEDIATE_EXIT:
 390         case KVM_CAP_S390_INJECT_IRQ:
 391         case KVM_CAP_S390_USER_SIGP:
 392         case KVM_CAP_S390_USER_STSI:
 393         case KVM_CAP_S390_SKEYS:
 394         case KVM_CAP_S390_IRQ_STATE:
 395         case KVM_CAP_S390_USER_INSTR0:
 396         case KVM_CAP_S390_CMMA_MIGRATION:
 397         case KVM_CAP_S390_AIS:
 398                 r = 1;
 399                 break;
 400         case KVM_CAP_S390_MEM_OP:
 401                 r = MEM_OP_MAX_SIZE;
 402                 break;
 403         case KVM_CAP_NR_VCPUS:
 404         case KVM_CAP_MAX_VCPUS:
 405                 r = KVM_S390_BSCA_CPU_SLOTS;
 406                 if (!kvm_s390_use_sca_entries())
 407                         r = KVM_MAX_VCPUS;
 408                 else if (sclp.has_esca && sclp.has_64bscao)
 409                         r = KVM_S390_ESCA_CPU_SLOTS;
 410                 break;
 411         case KVM_CAP_NR_MEMSLOTS:
 412                 r = KVM_USER_MEM_SLOTS;
 413                 break;
 414         case KVM_CAP_S390_COW:
 415                 r = MACHINE_HAS_ESOP;
 416                 break;
 417         case KVM_CAP_S390_VECTOR_REGISTERS:
 418                 r = MACHINE_HAS_VX;
 419                 break;
 420         case KVM_CAP_S390_RI:
 421                 r = test_facility(64);
 422                 break;
 423         case KVM_CAP_S390_GS:
 424                 r = test_facility(133);
 425                 break;
 426         default:
 427                 r = 0;
 428         }
 429         return r;
 430 }
 431
 432 static void kvm_s390_sync_dirty_log(struct kvm *kvm,
 433                                         struct kvm_memory_slot *memslot)
 434 {
 435         gfn_t cur_gfn, last_gfn;
 436         unsigned long address;
 437         struct gmap *gmap = kvm->arch.gmap;
 438
 439         /* Loop over all guest pages */
 440         last_gfn = memslot->base_gfn + memslot->npages;
 441         for (cur_gfn = memslot->base_gfn; cur_gfn <= last_gfn; cur_gfn++) {
 442                 address = gfn_to_hva_memslot(memslot, cur_gfn);
 443
 444                 if (test_and_clear_guest_dirty(gmap->mm, address))
 445                         mark_page_dirty(kvm, cur_gfn);
 446                 if (fatal_signal_pending(current))
 447                         return;
 448                 cond_resched();
 449         }
 450 }
 451
 452 /* Section: vm related */
 453 static void sca_del_vcpu(struct kvm_vcpu *vcpu);
 454
 455 /*
 456  * Get (and clear) the dirty memory log for a memory slot.
 457  */
 458 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 459                                struct kvm_dirty_log *log)
 460 {
 461         int r;
 462         unsigned long n;
 463         struct kvm_memslots *slots;
 464         struct kvm_memory_slot *memslot;
 465         int is_dirty = 0;
 466
 467         if (kvm_is_ucontrol(kvm))
 468                 return -EINVAL;
 469
 470         mutex_lock(&kvm->slots_lock);
 471
 472         r = -EINVAL;
 473         if (log->slot >= KVM_USER_MEM_SLOTS)
 474                 goto out;
 475
 476         slots = kvm_memslots(kvm);
 477         memslot = id_to_memslot(slots, log->slot);
 478         r = -ENOENT;
 479         if (!memslot->dirty_bitmap)
 480                 goto out;
 481
 482         kvm_s390_sync_dirty_log(kvm, memslot);
 483         r = kvm_get_dirty_log(kvm, log, &is_dirty);
 484         if (r)
 485                 goto out;
 486
 487         /* Clear the dirty log */
 488         if (is_dirty) {
 489                 n = kvm_dirty_bitmap_bytes(memslot);
 490                 memset(memslot->dirty_bitmap, 0, n);
 491         }
 492         r = 0;
 493 out:
 494         mutex_unlock(&kvm->slots_lock);
 495         return r;
 496 }
 497
 498 static void icpt_operexc_on_all_vcpus(struct kvm *kvm)
 499 {
 500         unsigned int i;
 501         struct kvm_vcpu *vcpu;
 502
 503         kvm_for_each_vcpu(i, vcpu, kvm) {
 504                 kvm_s390_sync_request(KVM_REQ_ICPT_OPEREXC, vcpu);
 505         }
 506 }
 507
 508 static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
 509 {
 510         int r;
 511
 512         if (cap->flags)
 513                 return -EINVAL;
 514
 515         switch (cap->cap) {
 516         case KVM_CAP_S390_IRQCHIP:
 517                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP");
 518                 kvm->arch.use_irqchip = 1;
 519                 r = 0;
 520                 break;
 521         case KVM_CAP_S390_USER_SIGP:
 522                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP");
 523                 kvm->arch.user_sigp = 1;
 524                 r = 0;
 525                 break;
 526         case KVM_CAP_S390_VECTOR_REGISTERS:
 527                 mutex_lock(&kvm->lock);
 528                 if (kvm->created_vcpus) {
 529                         r = -EBUSY;
 530                 } else if (MACHINE_HAS_VX) {
 531                         set_kvm_facility(kvm->arch.model.fac_mask, 129);
 532                         set_kvm_facility(kvm->arch.model.fac_list, 129);
 533                         if (test_facility(134)) {
 534                                 set_kvm_facility(kvm->arch.model.fac_mask, 134);
 535                                 set_kvm_facility(kvm->arch.model.fac_list, 134);
 536                         }
 537                         if (test_facility(135)) {
 538                                 set_kvm_facility(kvm->arch.model.fac_mask, 135);
 539                                 set_kvm_facility(kvm->arch.model.fac_list, 135);
 540                         }
 541                         r = 0;
 542                 } else
 543                         r = -EINVAL;
 544                 mutex_unlock(&kvm->lock);
 545                 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s",
 546                          r ? "(not available)" : "(success)");
 547                 break;
 548         case KVM_CAP_S390_RI:
 549                 r = -EINVAL;
 550                 mutex_lock(&kvm->lock);
 551                 if (kvm->created_vcpus) {
 552                         r = -EBUSY;
 553                 } else if (test_facility(64)) {
 554                         set_kvm_facility(kvm->arch.model.fac_mask, 64);
 555                         set_kvm_facility(kvm->arch.model.fac_list, 64);
 556                         r = 0;
 557                 }
 558                 mutex_unlock(&kvm->lock);
 559                 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s",
 560                          r ? "(not available)" : "(success)");
 561                 break;
 562         case KVM_CAP_S390_AIS:
 563                 mutex_lock(&kvm->lock);
 564                 if (kvm->created_vcpus) {
 565                         r = -EBUSY;
 566                 } else {
 567                         set_kvm_facility(kvm->arch.model.fac_mask, 72);
 568                         set_kvm_facility(kvm->arch.model.fac_list, 72);
 569                         r = 0;
 570                 }
 571                 mutex_unlock(&kvm->lock);
 572                 VM_EVENT(kvm, 3, "ENABLE: AIS %s",
 573                          r ? "(not available)" : "(success)");
 574                 break;
 575         case KVM_CAP_S390_GS:
 576                 r = -EINVAL;
 577                 mutex_lock(&kvm->lock);
 578                 if (atomic_read(&kvm->online_vcpus)) {
 579                         r = -EBUSY;
 580                 } else if (test_facility(133)) {
 581                         set_kvm_facility(kvm->arch.model.fac_mask, 133);
 582                         set_kvm_facility(kvm->arch.model.fac_list, 133);
 583                         r = 0;
 584                 }
 585                 mutex_unlock(&kvm->lock);
 586                 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_GS %s",
 587                          r ? "(not available)" : "(success)");
 588                 break;
 589         case KVM_CAP_S390_USER_STSI:
 590                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI");
 591                 kvm->arch.user_stsi = 1;
 592                 r = 0;
 593                 break;
 594         case KVM_CAP_S390_USER_INSTR0:
 595                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_INSTR0");
 596                 kvm->arch.user_instr0 = 1;
 597                 icpt_operexc_on_all_vcpus(kvm);
 598                 r = 0;
 599                 break;
 600         default:
 601                 r = -EINVAL;
 602                 break;
 603         }
 604         return r;
 605 }
 606
 607 static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
 608 {
 609         int ret;
 610
 611         switch (attr->attr) {
 612         case KVM_S390_VM_MEM_LIMIT_SIZE:
 613                 ret = 0;
 614                 VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes",
 615                          kvm->arch.mem_limit);
 616                 if (put_user(kvm->arch.mem_limit, (u64 __user *)attr->addr))
 617                         ret = -EFAULT;
 618                 break;
 619         default:
 620                 ret = -ENXIO;
 621                 break;
 622         }
 623         return ret;
 624 }
 625
 626 static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
 627 {
 628         int ret;
 629         unsigned int idx;
 630         switch (attr->attr) {
 631         case KVM_S390_VM_MEM_ENABLE_CMMA:
 632                 ret = -ENXIO;
 633                 if (!sclp.has_cmma)
 634                         break;
 635
 636                 ret = -EBUSY;
 637                 VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support");
 638                 mutex_lock(&kvm->lock);
 639                 if (!kvm->created_vcpus) {
 640                         kvm->arch.use_cmma = 1;
 641                         ret = 0;
 642                 }
 643                 mutex_unlock(&kvm->lock);
 644                 break;
 645         case KVM_S390_VM_MEM_CLR_CMMA:
 646                 ret = -ENXIO;
 647                 if (!sclp.has_cmma)
 648                         break;
 649                 ret = -EINVAL;
 650                 if (!kvm->arch.use_cmma)
 651                         break;
 652
 653                 VM_EVENT(kvm, 3, "%s", "RESET: CMMA states");
 654                 mutex_lock(&kvm->lock);
 655                 idx = srcu_read_lock(&kvm->srcu);
 656                 s390_reset_cmma(kvm->arch.gmap->mm);
 657                 srcu_read_unlock(&kvm->srcu, idx);
 658                 mutex_unlock(&kvm->lock);
 659                 ret = 0;
 660                 break;
 661         case KVM_S390_VM_MEM_LIMIT_SIZE: {
 662                 unsigned long new_limit;
 663
 664                 if (kvm_is_ucontrol(kvm))
 665                         return -EINVAL;
 666
 667                 if (get_user(new_limit, (u64 __user *)attr->addr))
 668                         return -EFAULT;
 669
 670                 if (kvm->arch.mem_limit != KVM_S390_NO_MEM_LIMIT &&
 671                     new_limit > kvm->arch.mem_limit)
 672                         return -E2BIG;
 673
 674                 if (!new_limit)
 675                         return -EINVAL;
 676
 677                 /* gmap_create takes last usable address */
 678                 if (new_limit != KVM_S390_NO_MEM_LIMIT)
 679                         new_limit -= 1;
 680
 681                 ret = -EBUSY;
 682                 mutex_lock(&kvm->lock);
 683                 if (!kvm->created_vcpus) {
 684                         /* gmap_create will round the limit up */
 685                         struct gmap *new = gmap_create(current->mm, new_limit);
 686
 687                         if (!new) {
 688                                 ret = -ENOMEM;
 689                         } else {
 690                                 gmap_remove(kvm->arch.gmap);
 691                                 new->private = kvm;
 692                                 kvm->arch.gmap = new;
 693                                 ret = 0;
 694                         }
 695                 }
 696                 mutex_unlock(&kvm->lock);
 697                 VM_EVENT(kvm, 3, "SET: max guest address: %lu", new_limit);
 698                 VM_EVENT(kvm, 3, "New guest asce: 0x%pK",
 699                          (void *) kvm->arch.gmap->asce);
 700                 break;
 701         }
 702         default:
 703                 ret = -ENXIO;
 704                 break;
 705         }
 706         return ret;
 707 }
 708
 709 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu);
 710
 711 static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
 712 {
 713         struct kvm_vcpu *vcpu;
 714         int i;
 715
 716         if (!test_kvm_facility(kvm, 76))
 717                 return -EINVAL;
 718
 719         mutex_lock(&kvm->lock);
 720         switch (attr->attr) {
 721         case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
 722                 get_random_bytes(
 723                         kvm->arch.crypto.crycb->aes_wrapping_key_mask,
 724                         sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
 725                 kvm->arch.crypto.aes_kw = 1;
 726                 VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support");
 727                 break;
 728         case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
 729                 get_random_bytes(
 730                         kvm->arch.crypto.crycb->dea_wrapping_key_mask,
 731                         sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
 732                 kvm->arch.crypto.dea_kw = 1;
 733                 VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support");
 734                 break;
 735         case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
 736                 kvm->arch.crypto.aes_kw = 0;
 737                 memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0,
 738                         sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
 739                 VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support");
 740                 break;
 741         case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
 742                 kvm->arch.crypto.dea_kw = 0;
 743                 memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0,
 744                         sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
 745                 VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support");
 746                 break;
 747         default:
 748                 mutex_unlock(&kvm->lock);
 749                 return -ENXIO;
 750         }
 751
 752         kvm_for_each_vcpu(i, vcpu, kvm) {
 753                 kvm_s390_vcpu_crypto_setup(vcpu);
 754                 exit_sie(vcpu);
 755         }
 756         mutex_unlock(&kvm->lock);
 757         return 0;
 758 }
 759
 760 static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req)
 761 {
 762         int cx;
 763         struct kvm_vcpu *vcpu;
 764
 765         kvm_for_each_vcpu(cx, vcpu, kvm)
 766                 kvm_s390_sync_request(req, vcpu);
 767 }
 768
 769 /*
 770  * Must be called with kvm->srcu held to avoid races on memslots, and with
 771  * kvm->lock to avoid races with ourselves and kvm_s390_vm_stop_migration.
 772  */
 773 static int kvm_s390_vm_start_migration(struct kvm *kvm)
 774 {
 775         struct kvm_s390_migration_state *mgs;
 776         struct kvm_memory_slot *ms;
 777         /* should be the only one */
 778         struct kvm_memslots *slots;
 779         unsigned long ram_pages;
 780         int slotnr;
 781
 782         /* migration mode already enabled */
 783         if (kvm->arch.migration_state)
 784                 return 0;
 785
 786         slots = kvm_memslots(kvm);
 787         if (!slots || !slots->used_slots)
 788                 return -EINVAL;
 789
 790         mgs = kzalloc(sizeof(*mgs), GFP_KERNEL);
 791         if (!mgs)
 792                 return -ENOMEM;
 793         kvm->arch.migration_state = mgs;
 794
 795         if (kvm->arch.use_cmma) {
 796                 /*
 797                  * Get the last slot. They should be sorted by base_gfn, so the
 798                  * last slot is also the one at the end of the address space.
 799                  * We have verified above that at least one slot is present.
 800                  */
 801                 ms = slots->memslots + slots->used_slots - 1;
 802                 /* round up so we only use full longs */
 803                 ram_pages = roundup(ms->base_gfn + ms->npages, BITS_PER_LONG);
 804                 /* allocate enough bytes to store all the bits */
 805                 mgs->pgste_bitmap = vmalloc(ram_pages / 8);
 806                 if (!mgs->pgste_bitmap) {
 807                         kfree(mgs);
 808                         kvm->arch.migration_state = NULL;
 809                         return -ENOMEM;
 810                 }
 811
 812                 mgs->bitmap_size = ram_pages;
 813                 atomic64_set(&mgs->dirty_pages, ram_pages);
 814                 /* mark all the pages in active slots as dirty */
 815                 for (slotnr = 0; slotnr < slots->used_slots; slotnr++) {
 816                         ms = slots->memslots + slotnr;
 817                         bitmap_set(mgs->pgste_bitmap, ms->base_gfn, ms->npages);
 818                 }
 819
 820                 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_START_MIGRATION);
 821         }
 822         return 0;
 823 }
 824
 825 /*
 826  * Must be called with kvm->lock to avoid races with ourselves and
 827  * kvm_s390_vm_start_migration.
 828  */
 829 static int kvm_s390_vm_stop_migration(struct kvm *kvm)
 830 {
 831         struct kvm_s390_migration_state *mgs;
 832
 833         /* migration mode already disabled */
 834         if (!kvm->arch.migration_state)
 835                 return 0;
 836         mgs = kvm->arch.migration_state;
 837         kvm->arch.migration_state = NULL;
 838
 839         if (kvm->arch.use_cmma) {
 840                 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_STOP_MIGRATION);
 841                 vfree(mgs->pgste_bitmap);
 842         }
 843         kfree(mgs);
 844         return 0;
 845 }
 846
 847 static int kvm_s390_vm_set_migration(struct kvm *kvm,
 848                                      struct kvm_device_attr *attr)
 849 {
 850         int idx, res = -ENXIO;
 851
 852         mutex_lock(&kvm->lock);
 853         switch (attr->attr) {
 854         case KVM_S390_VM_MIGRATION_START:
 855                 idx = srcu_read_lock(&kvm->srcu);
 856                 res = kvm_s390_vm_start_migration(kvm);
 857                 srcu_read_unlock(&kvm->srcu, idx);
 858                 break;
 859         case KVM_S390_VM_MIGRATION_STOP:
 860                 res = kvm_s390_vm_stop_migration(kvm);
 861                 break;
 862         default:
 863                 break;
 864         }
 865         mutex_unlock(&kvm->lock);
 866
 867         return res;
 868 }
 869
 870 static int kvm_s390_vm_get_migration(struct kvm *kvm,
 871                                      struct kvm_device_attr *attr)
 872 {
 873         u64 mig = (kvm->arch.migration_state != NULL);
 874
 875         if (attr->attr != KVM_S390_VM_MIGRATION_STATUS)
 876                 return -ENXIO;
 877
 878         if (copy_to_user((void __user *)attr->addr, &mig, sizeof(mig)))
 879                 return -EFAULT;
 880         return 0;
 881 }
 882
 883 static int kvm_s390_set_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
 884 {
 885         struct kvm_s390_vm_tod_clock gtod;
 886
 887         if (copy_from_user(&gtod, (void __user *)attr->addr, sizeof(gtod)))
 888                 return -EFAULT;
 889
 890         if (test_kvm_facility(kvm, 139))
 891                 kvm_s390_set_tod_clock_ext(kvm, &gtod);
 892         else if (gtod.epoch_idx == 0)
 893                 kvm_s390_set_tod_clock(kvm, gtod.tod);
 894         else
 895                 return -EINVAL;
 896
 897         VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x, TOD base: 0x%llx",
 898                 gtod.epoch_idx, gtod.tod);
 899
 900         return 0;
 901 }
 902
 903 static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
 904 {
 905         u8 gtod_high;
 906
 907         if (copy_from_user(&gtod_high, (void __user *)attr->addr,
 908                                            sizeof(gtod_high)))
 909                 return -EFAULT;
 910
 911         if (gtod_high != 0)
 912                 return -EINVAL;
 913         VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high);
 914
 915         return 0;
 916 }
 917
 918 static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
 919 {
 920         u64 gtod;
 921
 922         if (copy_from_user(&gtod, (void __user *)attr->addr, sizeof(gtod)))
 923                 return -EFAULT;
 924
 925         kvm_s390_set_tod_clock(kvm, gtod);
 926         VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod);
 927         return 0;
 928 }
 929
 930 static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr)
 931 {
 932         int ret;
 933
 934         if (attr->flags)
 935                 return -EINVAL;
 936
 937         switch (attr->attr) {
 938         case KVM_S390_VM_TOD_EXT:
 939                 ret = kvm_s390_set_tod_ext(kvm, attr);
 940                 break;
 941         case KVM_S390_VM_TOD_HIGH:
 942                 ret = kvm_s390_set_tod_high(kvm, attr);
 943                 break;
 944         case KVM_S390_VM_TOD_LOW:
 945                 ret = kvm_s390_set_tod_low(kvm, attr);
 946                 break;
 947         default:
 948                 ret = -ENXIO;
 949                 break;
 950         }
 951         return ret;
 952 }
 953
 954 static void kvm_s390_get_tod_clock_ext(struct kvm *kvm,
 955                                         struct kvm_s390_vm_tod_clock *gtod)
 956 {
 957         struct kvm_s390_tod_clock_ext htod;
 958
 959         preempt_disable();
 960
 961         get_tod_clock_ext((char *)&htod);
 962
 963         gtod->tod = htod.tod + kvm->arch.epoch;
 964         gtod->epoch_idx = htod.epoch_idx + kvm->arch.epdx;
 965
 966         if (gtod->tod < htod.tod)
 967                 gtod->epoch_idx += 1;
 968
 969         preempt_enable();
 970 }
 971
 972 static int kvm_s390_get_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
 973 {
 974         struct kvm_s390_vm_tod_clock gtod;
 975
 976         memset(&gtod, 0, sizeof(gtod));
 977
 978         if (test_kvm_facility(kvm, 139))
 979                 kvm_s390_get_tod_clock_ext(kvm, &gtod);
 980         else
 981                 gtod.tod = kvm_s390_get_tod_clock_fast(kvm);
 982
 983         if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
 984                 return -EFAULT;
 985
 986         VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x, TOD base: 0x%llx",
 987                 gtod.epoch_idx, gtod.tod);
 988         return 0;
 989 }
 990
 991 static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
 992 {
 993         u8 gtod_high = 0;
 994
 995         if (copy_to_user((void __user *)attr->addr, &gtod_high,
 996                                          sizeof(gtod_high)))
 997                 return -EFAULT;
 998         VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high);
 999
1000         return 0;
1001 }
1002
1003 static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
1004 {
1005         u64 gtod;
1006
1007         gtod = kvm_s390_get_tod_clock_fast(kvm);
1008         if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
1009                 return -EFAULT;
1010         VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod);
1011
1012         return 0;
1013 }
1014
1015 static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr)
1016 {
1017         int ret;
1018
1019         if (attr->flags)
1020                 return -EINVAL;
1021
1022         switch (attr->attr) {
1023         case KVM_S390_VM_TOD_EXT:
1024                 ret = kvm_s390_get_tod_ext(kvm, attr);
1025                 break;
1026         case KVM_S390_VM_TOD_HIGH:
1027                 ret = kvm_s390_get_tod_high(kvm, attr);
1028                 break;
1029         case KVM_S390_VM_TOD_LOW:
1030                 ret = kvm_s390_get_tod_low(kvm, attr);
1031                 break;
1032         default:
1033                 ret = -ENXIO;
1034                 break;
1035         }
1036         return ret;
1037 }
1038
1039 static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr)
1040 {
1041         struct kvm_s390_vm_cpu_processor *proc;
1042         u16 lowest_ibc, unblocked_ibc;
1043         int ret = 0;
1044
1045         mutex_lock(&kvm->lock);
1046         if (kvm->created_vcpus) {
1047                 ret = -EBUSY;
1048                 goto out;
1049         }
1050         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
1051         if (!proc) {
1052                 ret = -ENOMEM;
1053                 goto out;
1054         }
1055         if (!copy_from_user(proc, (void __user *)attr->addr,
1056                             sizeof(*proc))) {
1057                 kvm->arch.model.cpuid = proc->cpuid;
1058                 lowest_ibc = sclp.ibc >> 16 & 0xfff;
1059                 unblocked_ibc = sclp.ibc & 0xfff;
1060                 if (lowest_ibc && proc->ibc) {
1061                         if (proc->ibc > unblocked_ibc)
1062                                 kvm->arch.model.ibc = unblocked_ibc;
1063                         else if (proc->ibc < lowest_ibc)
1064                                 kvm->arch.model.ibc = lowest_ibc;
1065                         else
1066                                 kvm->arch.model.ibc = proc->ibc;
1067                 }
1068                 memcpy(kvm->arch.model.fac_list, proc->fac_list,
1069                        S390_ARCH_FAC_LIST_SIZE_BYTE);
1070                 VM_EVENT(kvm, 3, "SET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
1071                          kvm->arch.model.ibc,
1072                          kvm->arch.model.cpuid);
1073                 VM_EVENT(kvm, 3, "SET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
1074                          kvm->arch.model.fac_list[0],
1075                          kvm->arch.model.fac_list[1],
1076                          kvm->arch.model.fac_list[2]);
1077         } else
1078                 ret = -EFAULT;
1079         kfree(proc);
1080 out:
1081         mutex_unlock(&kvm->lock);
1082         return ret;
1083 }
1084
1085 static int kvm_s390_set_processor_feat(struct kvm *kvm,
1086                                        struct kvm_device_attr *attr)
1087 {
1088         struct kvm_s390_vm_cpu_feat data;
1089         int ret = -EBUSY;
1090
1091         if (copy_from_user(&data, (void __user *)attr->addr, sizeof(data)))
1092                 return -EFAULT;
1093         if (!bitmap_subset((unsigned long *) data.feat,
1094                            kvm_s390_available_cpu_feat,
1095                            KVM_S390_VM_CPU_FEAT_NR_BITS))
1096                 return -EINVAL;
1097
1098         mutex_lock(&kvm->lock);
1099         if (!atomic_read(&kvm->online_vcpus)) {
1100                 bitmap_copy(kvm->arch.cpu_feat, (unsigned long *) data.feat,
1101                             KVM_S390_VM_CPU_FEAT_NR_BITS);
1102                 ret = 0;
1103         }
1104         mutex_unlock(&kvm->lock);
1105         return ret;
1106 }
1107
1108 static int kvm_s390_set_processor_subfunc(struct kvm *kvm,
1109                                           struct kvm_device_attr *attr)
1110 {
1111         /*
1112          * Once supported by kernel + hw, we have to store the subfunctions
1113          * in kvm->arch and remember that user space configured them.
1114          */
1115         return -ENXIO;
1116 }
1117
1118 static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
1119 {
1120         int ret = -ENXIO;
1121
1122         switch (attr->attr) {
1123         case KVM_S390_VM_CPU_PROCESSOR:
1124                 ret = kvm_s390_set_processor(kvm, attr);
1125                 break;
1126         case KVM_S390_VM_CPU_PROCESSOR_FEAT:
1127                 ret = kvm_s390_set_processor_feat(kvm, attr);
1128                 break;
1129         case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1130                 ret = kvm_s390_set_processor_subfunc(kvm, attr);
1131                 break;
1132         }
1133         return ret;
1134 }
1135
1136 static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr)
1137 {
1138         struct kvm_s390_vm_cpu_processor *proc;
1139         int ret = 0;
1140
1141         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
1142         if (!proc) {
1143                 ret = -ENOMEM;
1144                 goto out;
1145         }
1146         proc->cpuid = kvm->arch.model.cpuid;
1147         proc->ibc = kvm->arch.model.ibc;
1148         memcpy(&proc->fac_list, kvm->arch.model.fac_list,
1149                S390_ARCH_FAC_LIST_SIZE_BYTE);
1150         VM_EVENT(kvm, 3, "GET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
1151                  kvm->arch.model.ibc,
1152                  kvm->arch.model.cpuid);
1153         VM_EVENT(kvm, 3, "GET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
1154                  kvm->arch.model.fac_list[0],
1155                  kvm->arch.model.fac_list[1],
1156                  kvm->arch.model.fac_list[2]);
1157         if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc)))
1158                 ret = -EFAULT;
1159         kfree(proc);
1160 out:
1161         return ret;
1162 }
1163
1164 static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr)
1165 {
1166         struct kvm_s390_vm_cpu_machine *mach;
1167         int ret = 0;
1168
1169         mach = kzalloc(sizeof(*mach), GFP_KERNEL);
1170         if (!mach) {
1171                 ret = -ENOMEM;
1172                 goto out;
1173         }
1174         get_cpu_id((struct cpuid *) &mach->cpuid);
1175         mach->ibc = sclp.ibc;
1176         memcpy(&mach->fac_mask, kvm->arch.model.fac_mask,
1177                S390_ARCH_FAC_LIST_SIZE_BYTE);
1178         memcpy((unsigned long *)&mach->fac_list, S390_lowcore.stfle_fac_list,
1179                sizeof(S390_lowcore.stfle_fac_list));
1180         VM_EVENT(kvm, 3, "GET: host ibc:  0x%4.4x, host cpuid:  0x%16.16llx",
1181                  kvm->arch.model.ibc,
1182                  kvm->arch.model.cpuid);
1183         VM_EVENT(kvm, 3, "GET: host facmask:  0x%16.16llx.%16.16llx.%16.16llx",
1184                  mach->fac_mask[0],
1185                  mach->fac_mask[1],
1186                  mach->fac_mask[2]);
1187         VM_EVENT(kvm, 3, "GET: host faclist:  0x%16.16llx.%16.16llx.%16.16llx",
1188                  mach->fac_list[0],
1189                  mach->fac_list[1],
1190                  mach->fac_list[2]);
1191         if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach)))
1192                 ret = -EFAULT;
1193         kfree(mach);
1194 out:
1195         return ret;
1196 }
1197
1198 static int kvm_s390_get_processor_feat(struct kvm *kvm,
1199                                        struct kvm_device_attr *attr)
1200 {
1201         struct kvm_s390_vm_cpu_feat data;
1202
1203         bitmap_copy((unsigned long *) data.feat, kvm->arch.cpu_feat,
1204                     KVM_S390_VM_CPU_FEAT_NR_BITS);
1205         if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
1206                 return -EFAULT;
1207         return 0;
1208 }
1209
1210 static int kvm_s390_get_machine_feat(struct kvm *kvm,
1211                                      struct kvm_device_attr *attr)
1212 {
1213         struct kvm_s390_vm_cpu_feat data;
1214
1215         bitmap_copy((unsigned long *) data.feat,
1216                     kvm_s390_available_cpu_feat,
1217                     KVM_S390_VM_CPU_FEAT_NR_BITS);
1218         if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
1219                 return -EFAULT;
1220         return 0;
1221 }
1222
1223 static int kvm_s390_get_processor_subfunc(struct kvm *kvm,
1224                                           struct kvm_device_attr *attr)
1225 {
1226         /*
1227          * Once we can actually configure subfunctions (kernel + hw support),
1228          * we have to check if they were already set by user space, if so copy
1229          * them from kvm->arch.
1230          */
1231         return -ENXIO;
1232 }
1233
1234 static int kvm_s390_get_machine_subfunc(struct kvm *kvm,
1235                                         struct kvm_device_attr *attr)
1236 {
1237         if (copy_to_user((void __user *)attr->addr, &kvm_s390_available_subfunc,
1238             sizeof(struct kvm_s390_vm_cpu_subfunc)))
1239                 return -EFAULT;
1240         return 0;
1241 }
1242 static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
1243 {
1244         int ret = -ENXIO;
1245
1246         switch (attr->attr) {
1247         case KVM_S390_VM_CPU_PROCESSOR:
1248                 ret = kvm_s390_get_processor(kvm, attr);
1249                 break;
1250         case KVM_S390_VM_CPU_MACHINE:
1251                 ret = kvm_s390_get_machine(kvm, attr);
1252                 break;
1253         case KVM_S390_VM_CPU_PROCESSOR_FEAT:
1254                 ret = kvm_s390_get_processor_feat(kvm, attr);
1255                 break;
1256         case KVM_S390_VM_CPU_MACHINE_FEAT:
1257                 ret = kvm_s390_get_machine_feat(kvm, attr);
1258                 break;
1259         case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1260                 ret = kvm_s390_get_processor_subfunc(kvm, attr);
1261                 break;
1262         case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
1263                 ret = kvm_s390_get_machine_subfunc(kvm, attr);
1264                 break;
1265         }
1266         return ret;
1267 }
1268
1269 static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1270 {
1271         int ret;
1272
1273         switch (attr->group) {
1274         case KVM_S390_VM_MEM_CTRL:
1275                 ret = kvm_s390_set_mem_control(kvm, attr);
1276                 break;
1277         case KVM_S390_VM_TOD:
1278                 ret = kvm_s390_set_tod(kvm, attr);
1279                 break;
1280         case KVM_S390_VM_CPU_MODEL:
1281                 ret = kvm_s390_set_cpu_model(kvm, attr);
1282                 break;
1283         case KVM_S390_VM_CRYPTO:
1284                 ret = kvm_s390_vm_set_crypto(kvm, attr);
1285                 break;
1286         case KVM_S390_VM_MIGRATION:
1287                 ret = kvm_s390_vm_set_migration(kvm, attr);
1288                 break;
1289         default:
1290                 ret = -ENXIO;
1291                 break;
1292         }
1293
1294         return ret;
1295 }
1296
1297 static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1298 {
1299         int ret;
1300
1301         switch (attr->group) {
1302         case KVM_S390_VM_MEM_CTRL:
1303                 ret = kvm_s390_get_mem_control(kvm, attr);
1304                 break;
1305         case KVM_S390_VM_TOD:
1306                 ret = kvm_s390_get_tod(kvm, attr);
1307                 break;
1308         case KVM_S390_VM_CPU_MODEL:
1309                 ret = kvm_s390_get_cpu_model(kvm, attr);
1310                 break;
1311         case KVM_S390_VM_MIGRATION:
1312                 ret = kvm_s390_vm_get_migration(kvm, attr);
1313                 break;
1314         default:
1315                 ret = -ENXIO;
1316                 break;
1317         }
1318
1319         return ret;
1320 }
1321
1322 static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1323 {
1324         int ret;
1325
1326         switch (attr->group) {
1327         case KVM_S390_VM_MEM_CTRL:
1328                 switch (attr->attr) {
1329                 case KVM_S390_VM_MEM_ENABLE_CMMA:
1330                 case KVM_S390_VM_MEM_CLR_CMMA:
1331                         ret = sclp.has_cmma ? 0 : -ENXIO;
1332                         break;
1333                 case KVM_S390_VM_MEM_LIMIT_SIZE:
1334                         ret = 0;
1335                         break;
1336                 default:
1337                         ret = -ENXIO;
1338                         break;
1339                 }
1340                 break;
1341         case KVM_S390_VM_TOD:
1342                 switch (attr->attr) {
1343                 case KVM_S390_VM_TOD_LOW:
1344                 case KVM_S390_VM_TOD_HIGH:
1345                         ret = 0;
1346                         break;
1347                 default:
1348                         ret = -ENXIO;
1349                         break;
1350                 }
1351                 break;
1352         case KVM_S390_VM_CPU_MODEL:
1353                 switch (attr->attr) {
1354                 case KVM_S390_VM_CPU_PROCESSOR:
1355                 case KVM_S390_VM_CPU_MACHINE:
1356                 case KVM_S390_VM_CPU_PROCESSOR_FEAT:
1357                 case KVM_S390_VM_CPU_MACHINE_FEAT:
1358                 case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
1359                         ret = 0;
1360                         break;
1361                 /* configuring subfunctions is not supported yet */
1362                 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1363                 default:
1364                         ret = -ENXIO;
1365                         break;
1366                 }
1367                 break;
1368         case KVM_S390_VM_CRYPTO:
1369                 switch (attr->attr) {
1370                 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
1371                 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
1372                 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
1373                 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
1374                         ret = 0;
1375                         break;
1376                 default:
1377                         ret = -ENXIO;
1378                         break;
1379                 }
1380                 break;
1381         case KVM_S390_VM_MIGRATION:
1382                 ret = 0;
1383                 break;
1384         default:
1385                 ret = -ENXIO;
1386                 break;
1387         }
1388
1389         return ret;
1390 }
1391
1392 static long kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
1393 {
1394         uint8_t *keys;
1395         uint64_t hva;
1396         int srcu_idx, i, r = 0;
1397
1398         if (args->flags != 0)
1399                 return -EINVAL;
1400
1401         /* Is this guest using storage keys? */
1402         if (!mm_use_skey(current->mm))
1403                 return KVM_S390_GET_SKEYS_NONE;
1404
1405         /* Enforce sane limit on memory allocation */
1406         if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
1407                 return -EINVAL;
1408
1409         keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL);
1410         if (!keys)
1411                 return -ENOMEM;
1412
1413         down_read(&current->mm->mmap_sem);
1414         srcu_idx = srcu_read_lock(&kvm->srcu);
1415         for (i = 0; i < args->count; i++) {
1416                 hva = gfn_to_hva(kvm, args->start_gfn + i);
1417                 if (kvm_is_error_hva(hva)) {
1418                         r = -EFAULT;
1419                         break;
1420                 }
1421
1422                 r = get_guest_storage_key(current->mm, hva, &keys[i]);
1423                 if (r)
1424                         break;
1425         }
1426         srcu_read_unlock(&kvm->srcu, srcu_idx);
1427         up_read(&current->mm->mmap_sem);
1428
1429         if (!r) {
1430                 r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys,
1431                                  sizeof(uint8_t) * args->count);
1432                 if (r)
1433                         r = -EFAULT;
1434         }
1435
1436         kvfree(keys);
1437         return r;
1438 }
1439
1440 static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
1441 {
1442         uint8_t *keys;
1443         uint64_t hva;
1444         int srcu_idx, i, r = 0;
1445
1446         if (args->flags != 0)
1447                 return -EINVAL;
1448
1449         /* Enforce sane limit on memory allocation */
1450         if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
1451                 return -EINVAL;
1452
1453         keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL);
1454         if (!keys)
1455                 return -ENOMEM;
1456
1457         r = copy_from_user(keys, (uint8_t __user *)args->skeydata_addr,
1458                            sizeof(uint8_t) * args->count);
1459         if (r) {
1460                 r = -EFAULT;
1461                 goto out;
1462         }
1463
1464         /* Enable storage key handling for the guest */
1465         r = s390_enable_skey();
1466         if (r)
1467                 goto out;
1468
1469         down_read(&current->mm->mmap_sem);
1470         srcu_idx = srcu_read_lock(&kvm->srcu);
1471         for (i = 0; i < args->count; i++) {
1472                 hva = gfn_to_hva(kvm, args->start_gfn + i);
1473                 if (kvm_is_error_hva(hva)) {
1474                         r = -EFAULT;
1475                         break;
1476                 }
1477
1478                 /* Lowest order bit is reserved */
1479                 if (keys[i] & 0x01) {
1480                         r = -EINVAL;
1481                         break;
1482                 }
1483
1484                 r = set_guest_storage_key(current->mm, hva, keys[i], 0);
1485                 if (r)
1486                         break;
1487         }
1488         srcu_read_unlock(&kvm->srcu, srcu_idx);
1489         up_read(&current->mm->mmap_sem);
1490 out:
1491         kvfree(keys);
1492         return r;
1493 }
1494
1495 /*
1496  * Base address and length must be sent at the start of each block, therefore
1497  * it's cheaper to send some clean data, as long as it's less than the size of
1498  * two longs.
1499  */
1500 #define KVM_S390_MAX_BIT_DISTANCE (2 * sizeof(void *))
1501 /* for consistency */
1502 #define KVM_S390_CMMA_SIZE_MAX ((u32)KVM_S390_SKEYS_MAX)
1503
1504 /*
1505  * This function searches for the next page with dirty CMMA attributes, and
1506  * saves the attributes in the buffer up to either the end of the buffer or
1507  * until a block of at least KVM_S390_MAX_BIT_DISTANCE clean bits is found;
1508  * no trailing clean bytes are saved.
1509  * In case no dirty bits were found, or if CMMA was not enabled or used, the
1510  * output buffer will indicate 0 as length.
1511  */
1512 static int kvm_s390_get_cmma_bits(struct kvm *kvm,
1513                                   struct kvm_s390_cmma_log *args)
1514 {
1515         struct kvm_s390_migration_state *s = kvm->arch.migration_state;
1516         unsigned long bufsize, hva, pgstev, i, next, cur;
1517         int srcu_idx, peek, r = 0, rr;
1518         u8 *res;
1519
1520         cur = args->start_gfn;
1521         i = next = pgstev = 0;
1522
1523         if (unlikely(!kvm->arch.use_cmma))
1524                 return -ENXIO;
1525         /* Invalid/unsupported flags were specified */
1526         if (args->flags & ~KVM_S390_CMMA_PEEK)
1527                 return -EINVAL;
1528         /* Migration mode query, and we are not doing a migration */
1529         peek = !!(args->flags & KVM_S390_CMMA_PEEK);
1530         if (!peek && !s)
1531                 return -EINVAL;
1532         /* CMMA is disabled or was not used, or the buffer has length zero */
1533         bufsize = min(args->count, KVM_S390_CMMA_SIZE_MAX);
1534         if (!bufsize || !kvm->mm->context.use_cmma) {
1535                 memset(args, 0, sizeof(*args));
1536                 return 0;
1537         }
1538
1539         if (!peek) {
1540                 /* We are not peeking, and there are no dirty pages */
1541                 if (!atomic64_read(&s->dirty_pages)) {
1542                         memset(args, 0, sizeof(*args));
1543                         return 0;
1544                 }
1545                 cur = find_next_bit(s->pgste_bitmap, s->bitmap_size,
1546                                     args->start_gfn);
1547                 if (cur >= s->bitmap_size)      /* nothing found, loop back */
1548                         cur = find_next_bit(s->pgste_bitmap, s->bitmap_size, 0);
1549                 if (cur >= s->bitmap_size) {    /* again! (very unlikely) */
1550                         memset(args, 0, sizeof(*args));
1551                         return 0;
1552                 }
1553                 next = find_next_bit(s->pgste_bitmap, s->bitmap_size, cur + 1);
1554         }
1555
1556         res = vmalloc(bufsize);
1557         if (!res)
1558                 return -ENOMEM;
1559
1560         args->start_gfn = cur;
1561
1562         down_read(&kvm->mm->mmap_sem);
1563         srcu_idx = srcu_read_lock(&kvm->srcu);
1564         while (i < bufsize) {
1565                 hva = gfn_to_hva(kvm, cur);
1566                 if (kvm_is_error_hva(hva)) {
1567                         r = -EFAULT;
1568                         break;
1569                 }
1570                 /* decrement only if we actually flipped the bit to 0 */
1571                 if (!peek && test_and_clear_bit(cur, s->pgste_bitmap))
1572                         atomic64_dec(&s->dirty_pages);
1573                 r = get_pgste(kvm->mm, hva, &pgstev);
1574                 if (r < 0)
1575                         pgstev = 0;
1576                 /* save the value */
1577                 res[i++] = (pgstev >> 24) & 0x43;
1578                 /*
1579                  * if the next bit is too far away, stop.
1580                  * if we reached the previous "next", find the next one
1581                  */
1582                 if (!peek) {
1583                         if (next > cur + KVM_S390_MAX_BIT_DISTANCE)
1584                                 break;
1585                         if (cur == next)
1586                                 next = find_next_bit(s->pgste_bitmap,
1587                                                      s->bitmap_size, cur + 1);
1588                 /* reached the end of the bitmap or of the buffer, stop */
1589                         if ((next >= s->bitmap_size) ||
1590                             (next >= args->start_gfn + bufsize))
1591                                 break;
1592                 }
1593                 cur++;
1594         }
1595         srcu_read_unlock(&kvm->srcu, srcu_idx);
1596         up_read(&kvm->mm->mmap_sem);
1597         args->count = i;
1598         args->remaining = s ? atomic64_read(&s->dirty_pages) : 0;
1599
1600         rr = copy_to_user((void __user *)args->values, res, args->count);
1601         if (rr)
1602                 r = -EFAULT;
1603
1604         vfree(res);
1605         return r;
1606 }
1607
1608 /*
1609  * This function sets the CMMA attributes for the given pages. If the input
1610  * buffer has zero length, no action is taken, otherwise the attributes are
1611  * set and the mm->context.use_cmma flag is set.
1612  */
1613 static int kvm_s390_set_cmma_bits(struct kvm *kvm,
1614                                   const struct kvm_s390_cmma_log *args)
1615 {
1616         unsigned long hva, mask, pgstev, i;
1617         uint8_t *bits;
1618         int srcu_idx, r = 0;
1619
1620         mask = args->mask;
1621
1622         if (!kvm->arch.use_cmma)
1623                 return -ENXIO;
1624         /* invalid/unsupported flags */
1625         if (args->flags != 0)
1626                 return -EINVAL;
1627         /* Enforce sane limit on memory allocation */
1628         if (args->count > KVM_S390_CMMA_SIZE_MAX)
1629                 return -EINVAL;
1630         /* Nothing to do */
1631         if (args->count == 0)
1632                 return 0;
1633
1634         bits = vmalloc(sizeof(*bits) * args->count);
1635         if (!bits)
1636                 return -ENOMEM;
1637
1638         r = copy_from_user(bits, (void __user *)args->values, args->count);
1639         if (r) {
1640                 r = -EFAULT;
1641                 goto out;
1642         }
1643
1644         down_read(&kvm->mm->mmap_sem);
1645         srcu_idx = srcu_read_lock(&kvm->srcu);
1646         for (i = 0; i < args->count; i++) {
1647                 hva = gfn_to_hva(kvm, args->start_gfn + i);
1648                 if (kvm_is_error_hva(hva)) {
1649                         r = -EFAULT;
1650                         break;
1651                 }
1652
1653                 pgstev = bits[i];
1654                 pgstev = pgstev << 24;
1655                 mask &= _PGSTE_GPS_USAGE_MASK | _PGSTE_GPS_NODAT;
1656                 set_pgste_bits(kvm->mm, hva, mask, pgstev);
1657         }
1658         srcu_read_unlock(&kvm->srcu, srcu_idx);
1659         up_read(&kvm->mm->mmap_sem);
1660
1661         if (!kvm->mm->context.use_cmma) {
1662                 down_write(&kvm->mm->mmap_sem);
1663                 kvm->mm->context.use_cmma = 1;
1664                 up_write(&kvm->mm->mmap_sem);
1665         }
1666 out:
1667         vfree(bits);
1668         return r;
1669 }
1670
1671 long kvm_arch_vm_ioctl(struct file *filp,
1672                        unsigned int ioctl, unsigned long arg)
1673 {
1674         struct kvm *kvm = filp->private_data;
1675         void __user *argp = (void __user *)arg;
1676         struct kvm_device_attr attr;
1677         int r;
1678
1679         switch (ioctl) {
1680         case KVM_S390_INTERRUPT: {
1681                 struct kvm_s390_interrupt s390int;
1682
1683                 r = -EFAULT;
1684                 if (copy_from_user(&s390int, argp, sizeof(s390int)))
1685                         break;
1686                 r = kvm_s390_inject_vm(kvm, &s390int);
1687                 break;
1688         }
1689         case KVM_ENABLE_CAP: {
1690                 struct kvm_enable_cap cap;
1691                 r = -EFAULT;
1692                 if (copy_from_user(&cap, argp, sizeof(cap)))
1693                         break;
1694                 r = kvm_vm_ioctl_enable_cap(kvm, &cap);
1695                 break;
1696         }
1697         case KVM_CREATE_IRQCHIP: {
1698                 struct kvm_irq_routing_entry routing;
1699
1700                 r = -EINVAL;
1701                 if (kvm->arch.use_irqchip) {
1702                         /* Set up dummy routing. */
1703                         memset(&routing, 0, sizeof(routing));
1704                         r = kvm_set_irq_routing(kvm, &routing, 0, 0);
1705                 }
1706                 break;
1707         }
1708         case KVM_SET_DEVICE_ATTR: {
1709                 r = -EFAULT;
1710                 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
1711                         break;
1712                 r = kvm_s390_vm_set_attr(kvm, &attr);
1713                 break;
1714         }
1715         case KVM_GET_DEVICE_ATTR: {
1716                 r = -EFAULT;
1717                 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
1718                         break;
1719                 r = kvm_s390_vm_get_attr(kvm, &attr);
1720                 break;
1721         }
1722         case KVM_HAS_DEVICE_ATTR: {
1723                 r = -EFAULT;
1724                 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
1725                         break;
1726                 r = kvm_s390_vm_has_attr(kvm, &attr);
1727                 break;
1728         }
1729         case KVM_S390_GET_SKEYS: {
1730                 struct kvm_s390_skeys args;
1731
1732                 r = -EFAULT;
1733                 if (copy_from_user(&args, argp,
1734                                    sizeof(struct kvm_s390_skeys)))
1735                         break;
1736                 r = kvm_s390_get_skeys(kvm, &args);
1737                 break;
1738         }
1739         case KVM_S390_SET_SKEYS: {
1740                 struct kvm_s390_skeys args;
1741
1742                 r = -EFAULT;
1743                 if (copy_from_user(&args, argp,
1744                                    sizeof(struct kvm_s390_skeys)))
1745                         break;
1746                 r = kvm_s390_set_skeys(kvm, &args);
1747                 break;
1748         }
1749         case KVM_S390_GET_CMMA_BITS: {
1750                 struct kvm_s390_cmma_log args;
1751
1752                 r = -EFAULT;
1753                 if (copy_from_user(&args, argp, sizeof(args)))
1754                         break;
1755                 r = kvm_s390_get_cmma_bits(kvm, &args);
1756                 if (!r) {
1757                         r = copy_to_user(argp, &args, sizeof(args));
1758                         if (r)
1759                                 r = -EFAULT;
1760                 }
1761                 break;
1762         }
1763         case KVM_S390_SET_CMMA_BITS: {
1764                 struct kvm_s390_cmma_log args;
1765
1766                 r = -EFAULT;
1767                 if (copy_from_user(&args, argp, sizeof(args)))
1768                         break;
1769                 r = kvm_s390_set_cmma_bits(kvm, &args);
1770                 break;
1771         }
1772         default:
1773                 r = -ENOTTY;
1774         }
1775
1776         return r;
1777 }
1778
1779 static int kvm_s390_query_ap_config(u8 *config)
1780 {
1781         u32 fcn_code = 0x04000000UL;
1782         u32 cc = 0;
1783
1784         memset(config, 0, 128);
1785         asm volatile(
1786                 "lgr 0,%1\n"
1787                 "lgr 2,%2\n"
1788                 ".long 0xb2af0000\n"            /* PQAP(QCI) */
1789                 "0: ipm %0\n"
1790                 "srl %0,28\n"
1791                 "1:\n"
1792                 EX_TABLE(0b, 1b)
1793                 : "+r" (cc)
1794                 : "r" (fcn_code), "r" (config)
1795                 : "cc", "0", "2", "memory"
1796         );
1797
1798         return cc;
1799 }
1800
1801 static int kvm_s390_apxa_installed(void)
1802 {
1803         u8 config[128];
1804         int cc;
1805
1806         if (test_facility(12)) {
1807                 cc = kvm_s390_query_ap_config(config);
1808
1809                 if (cc)
1810                         pr_err("PQAP(QCI) failed with cc=%d", cc);
1811                 else
1812                         return config[0] & 0x40;
1813         }
1814
1815         return 0;
1816 }
1817
1818 static void kvm_s390_set_crycb_format(struct kvm *kvm)
1819 {
1820         kvm->arch.crypto.crycbd = (__u32)(unsigned long) kvm->arch.crypto.crycb;
1821
1822         if (kvm_s390_apxa_installed())
1823                 kvm->arch.crypto.crycbd |= CRYCB_FORMAT2;
1824         else
1825                 kvm->arch.crypto.crycbd |= CRYCB_FORMAT1;
1826 }
1827
1828 static u64 kvm_s390_get_initial_cpuid(void)
1829 {
1830         struct cpuid cpuid;
1831
1832         get_cpu_id(&cpuid);
1833         cpuid.version = 0xff;
1834         return *((u64 *) &cpuid);
1835 }
1836
1837 static void kvm_s390_crypto_init(struct kvm *kvm)
1838 {
1839         if (!test_kvm_facility(kvm, 76))
1840                 return;
1841
1842         kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb;
1843         kvm_s390_set_crycb_format(kvm);
1844
1845         /* Enable AES/DEA protected key functions by default */
1846         kvm->arch.crypto.aes_kw = 1;
1847         kvm->arch.crypto.dea_kw = 1;
1848         get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask,
1849                          sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
1850         get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask,
1851                          sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
1852 }
1853
1854 static void sca_dispose(struct kvm *kvm)
1855 {
1856         if (kvm->arch.use_esca)
1857                 free_pages_exact(kvm->arch.sca, sizeof(struct esca_block));
1858         else
1859                 free_page((unsigned long)(kvm->arch.sca));
1860         kvm->arch.sca = NULL;
1861 }
1862
1863 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
1864 {
1865         gfp_t alloc_flags = GFP_KERNEL;
1866         int i, rc;
1867         char debug_name[16];
1868         static unsigned long sca_offset;
1869
1870         rc = -EINVAL;
1871 #ifdef CONFIG_KVM_S390_UCONTROL
1872         if (type & ~KVM_VM_S390_UCONTROL)
1873                 goto out_err;
1874         if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN)))
1875                 goto out_err;
1876 #else
1877         if (type)
1878                 goto out_err;
1879 #endif
1880
1881         rc = s390_enable_sie();
1882         if (rc)
1883                 goto out_err;
1884
1885         rc = -ENOMEM;
1886
1887         ratelimit_state_init(&kvm->arch.sthyi_limit, 5 * HZ, 500);
1888
1889         kvm->arch.use_esca = 0; /* start with basic SCA */
1890         if (!sclp.has_64bscao)
1891                 alloc_flags |= GFP_DMA;
1892         rwlock_init(&kvm->arch.sca_lock);
1893         kvm->arch.sca = (struct bsca_block *) get_zeroed_page(alloc_flags);
1894         if (!kvm->arch.sca)
1895                 goto out_err;
1896         spin_lock(&kvm_lock);
1897         sca_offset += 16;
1898         if (sca_offset + sizeof(struct bsca_block) > PAGE_SIZE)
1899                 sca_offset = 0;
1900         kvm->arch.sca = (struct bsca_block *)
1901                         ((char *) kvm->arch.sca + sca_offset);
1902         spin_unlock(&kvm_lock);
1903
1904         sprintf(debug_name, "kvm-%u", current->pid);
1905
1906         kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long));
1907         if (!kvm->arch.dbf)
1908                 goto out_err;
1909
1910         kvm->arch.sie_page2 =
1911              (struct sie_page2 *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1912         if (!kvm->arch.sie_page2)
1913                 goto out_err;
1914
1915         /* Populate the facility mask initially. */
1916         memcpy(kvm->arch.model.fac_mask, S390_lowcore.stfle_fac_list,
1917                sizeof(S390_lowcore.stfle_fac_list));
1918         for (i = 0; i < S390_ARCH_FAC_LIST_SIZE_U64; i++) {
1919                 if (i < kvm_s390_fac_list_mask_size())
1920                         kvm->arch.model.fac_mask[i] &= kvm_s390_fac_list_mask[i];
1921                 else
1922                         kvm->arch.model.fac_mask[i] = 0UL;
1923         }
1924
1925         /* Populate the facility list initially. */
1926         kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list;
1927         memcpy(kvm->arch.model.fac_list, kvm->arch.model.fac_mask,
1928                S390_ARCH_FAC_LIST_SIZE_BYTE);
1929
1930         /* we are always in czam mode - even on pre z14 machines */
1931         set_kvm_facility(kvm->arch.model.fac_mask, 138);
1932         set_kvm_facility(kvm->arch.model.fac_list, 138);
1933         /* we emulate STHYI in kvm */
1934         set_kvm_facility(kvm->arch.model.fac_mask, 74);
1935         set_kvm_facility(kvm->arch.model.fac_list, 74);
1936         if (MACHINE_HAS_TLB_GUEST) {
1937                 set_kvm_facility(kvm->arch.model.fac_mask, 147);
1938                 set_kvm_facility(kvm->arch.model.fac_list, 147);
1939         }
1940
1941         kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid();
1942         kvm->arch.model.ibc = sclp.ibc & 0x0fff;
1943
1944         kvm_s390_crypto_init(kvm);
1945
1946         mutex_init(&kvm->arch.float_int.ais_lock);
1947         kvm->arch.float_int.simm = 0;
1948         kvm->arch.float_int.nimm = 0;
1949         spin_lock_init(&kvm->arch.float_int.lock);
1950         for (i = 0; i < FIRQ_LIST_COUNT; i++)
1951                 INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]);
1952         init_waitqueue_head(&kvm->arch.ipte_wq);
1953         mutex_init(&kvm->arch.ipte_mutex);
1954
1955         debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
1956         VM_EVENT(kvm, 3, "vm created with type %lu", type);
1957
1958         if (type & KVM_VM_S390_UCONTROL) {
1959                 kvm->arch.gmap = NULL;
1960                 kvm->arch.mem_limit = KVM_S390_NO_MEM_LIMIT;
1961         } else {
1962                 if (sclp.hamax == U64_MAX)
1963                         kvm->arch.mem_limit = TASK_SIZE_MAX;
1964                 else
1965                         kvm->arch.mem_limit = min_t(unsigned long, TASK_SIZE_MAX,
1966                                                     sclp.hamax + 1);
1967                 kvm->arch.gmap = gmap_create(current->mm, kvm->arch.mem_limit - 1);
1968                 if (!kvm->arch.gmap)
1969                         goto out_err;
1970                 kvm->arch.gmap->private = kvm;
1971                 kvm->arch.gmap->pfault_enabled = 0;
1972         }
1973
1974         kvm->arch.css_support = 0;
1975         kvm->arch.use_irqchip = 0;
1976         kvm->arch.epoch = 0;
1977
1978         spin_lock_init(&kvm->arch.start_stop_lock);
1979         kvm_s390_vsie_init(kvm);
1980         KVM_EVENT(3, "vm 0x%pK created by pid %u", kvm, current->pid);
1981
1982         return 0;
1983 out_err:
1984         free_page((unsigned long)kvm->arch.sie_page2);
1985         debug_unregister(kvm->arch.dbf);
1986         sca_dispose(kvm);
1987         KVM_EVENT(3, "creation of vm failed: %d", rc);
1988         return rc;
1989 }
1990
1991 bool kvm_arch_has_vcpu_debugfs(void)
1992 {
1993         return false;
1994 }
1995
1996 int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
1997 {
1998         return 0;
1999 }
2000
2001 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
2002 {
2003         VCPU_EVENT(vcpu, 3, "%s", "free cpu");
2004         trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
2005         kvm_s390_clear_local_irqs(vcpu);
2006         kvm_clear_async_pf_completion_queue(vcpu);
2007         if (!kvm_is_ucontrol(vcpu->kvm))
2008                 sca_del_vcpu(vcpu);
2009
2010         if (kvm_is_ucontrol(vcpu->kvm))
2011                 gmap_remove(vcpu->arch.gmap);
2012
2013         if (vcpu->kvm->arch.use_cmma)
2014                 kvm_s390_vcpu_unsetup_cmma(vcpu);
2015         free_page((unsigned long)(vcpu->arch.sie_block));
2016
2017         kvm_vcpu_uninit(vcpu);
2018         kmem_cache_free(kvm_vcpu_cache, vcpu);
2019 }
2020
2021 static void kvm_free_vcpus(struct kvm *kvm)
2022 {
2023         unsigned int i;
2024         struct kvm_vcpu *vcpu;
2025
2026         kvm_for_each_vcpu(i, vcpu, kvm)
2027                 kvm_arch_vcpu_destroy(vcpu);
2028
2029         mutex_lock(&kvm->lock);
2030         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
2031                 kvm->vcpus[i] = NULL;
2032
2033         atomic_set(&kvm->online_vcpus, 0);
2034         mutex_unlock(&kvm->lock);
2035 }
2036
2037 void kvm_arch_destroy_vm(struct kvm *kvm)
2038 {
2039         kvm_free_vcpus(kvm);
2040         sca_dispose(kvm);
2041         debug_unregister(kvm->arch.dbf);
2042         free_page((unsigned long)kvm->arch.sie_page2);
2043         if (!kvm_is_ucontrol(kvm))
2044                 gmap_remove(kvm->arch.gmap);
2045         kvm_s390_destroy_adapters(kvm);
2046         kvm_s390_clear_float_irqs(kvm);
2047         kvm_s390_vsie_destroy(kvm);
2048         if (kvm->arch.migration_state) {
2049                 vfree(kvm->arch.migration_state->pgste_bitmap);
2050                 kfree(kvm->arch.migration_state);
2051         }
2052         KVM_EVENT(3, "vm 0x%pK destroyed", kvm);
2053 }
2054
2055 /* Section: vcpu related */
2056 static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu)
2057 {
2058         vcpu->arch.gmap = gmap_create(current->mm, -1UL);
2059         if (!vcpu->arch.gmap)
2060                 return -ENOMEM;
2061         vcpu->arch.gmap->private = vcpu->kvm;
2062
2063         return 0;
2064 }
2065
2066 static void sca_del_vcpu(struct kvm_vcpu *vcpu)
2067 {
2068         if (!kvm_s390_use_sca_entries())
2069                 return;
2070         read_lock(&vcpu->kvm->arch.sca_lock);
2071         if (vcpu->kvm->arch.use_esca) {
2072                 struct esca_block *sca = vcpu->kvm->arch.sca;
2073
2074                 clear_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
2075                 sca->cpu[vcpu->vcpu_id].sda = 0;
2076         } else {
2077                 struct bsca_block *sca = vcpu->kvm->arch.sca;
2078
2079                 clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
2080                 sca->cpu[vcpu->vcpu_id].sda = 0;
2081         }
2082         read_unlock(&vcpu->kvm->arch.sca_lock);
2083 }
2084
2085 static void sca_add_vcpu(struct kvm_vcpu *vcpu)
2086 {
2087         if (!kvm_s390_use_sca_entries()) {
2088                 struct bsca_block *sca = vcpu->kvm->arch.sca;
2089
2090                 /* we still need the basic sca for the ipte control */
2091                 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
2092                 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
2093         }
2094         read_lock(&vcpu->kvm->arch.sca_lock);
2095         if (vcpu->kvm->arch.use_esca) {
2096                 struct esca_block *sca = vcpu->kvm->arch.sca;
2097
2098                 sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
2099                 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
2100                 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca & ~0x3fU;
2101                 vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
2102                 set_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
2103         } else {
2104                 struct bsca_block *sca = vcpu->kvm->arch.sca;
2105
2106                 sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
2107                 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
2108                 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
2109                 set_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
2110         }
2111         read_unlock(&vcpu->kvm->arch.sca_lock);
2112 }
2113
2114 /* Basic SCA to Extended SCA data copy routines */
2115 static inline void sca_copy_entry(struct esca_entry *d, struct bsca_entry *s)
2116 {
2117         d->sda = s->sda;
2118         d->sigp_ctrl.c = s->sigp_ctrl.c;
2119         d->sigp_ctrl.scn = s->sigp_ctrl.scn;
2120 }
2121
2122 static void sca_copy_b_to_e(struct esca_block *d, struct bsca_block *s)
2123 {
2124         int i;
2125
2126         d->ipte_control = s->ipte_control;
2127         d->mcn[0] = s->mcn;
2128         for (i = 0; i < KVM_S390_BSCA_CPU_SLOTS; i++)
2129                 sca_copy_entry(&d->cpu[i], &s->cpu[i]);
2130 }
2131
2132 static int sca_switch_to_extended(struct kvm *kvm)
2133 {
2134         struct bsca_block *old_sca = kvm->arch.sca;
2135         struct esca_block *new_sca;
2136         struct kvm_vcpu *vcpu;
2137         unsigned int vcpu_idx;
2138         u32 scaol, scaoh;
2139
2140         new_sca = alloc_pages_exact(sizeof(*new_sca), GFP_KERNEL|__GFP_ZERO);
2141         if (!new_sca)
2142                 return -ENOMEM;
2143
2144         scaoh = (u32)((u64)(new_sca) >> 32);
2145         scaol = (u32)(u64)(new_sca) & ~0x3fU;
2146
2147         kvm_s390_vcpu_block_all(kvm);
2148         write_lock(&kvm->arch.sca_lock);
2149
2150         sca_copy_b_to_e(new_sca, old_sca);
2151
2152         kvm_for_each_vcpu(vcpu_idx, vcpu, kvm) {
2153                 vcpu->arch.sie_block->scaoh = scaoh;
2154                 vcpu->arch.sie_block->scaol = scaol;
2155                 vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
2156         }
2157         kvm->arch.sca = new_sca;
2158         kvm->arch.use_esca = 1;
2159
2160         write_unlock(&kvm->arch.sca_lock);
2161         kvm_s390_vcpu_unblock_all(kvm);
2162
2163         free_page((unsigned long)old_sca);
2164
2165         VM_EVENT(kvm, 2, "Switched to ESCA (0x%pK -> 0x%pK)",
2166                  old_sca, kvm->arch.sca);
2167         return 0;
2168 }
2169
2170 static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)
2171 {
2172         int rc;
2173
2174         if (!kvm_s390_use_sca_entries()) {
2175                 if (id < KVM_MAX_VCPUS)
2176                         return true;
2177                 return false;
2178         }
2179         if (id < KVM_S390_BSCA_CPU_SLOTS)
2180                 return true;
2181         if (!sclp.has_esca || !sclp.has_64bscao)
2182                 return false;
2183
2184         mutex_lock(&kvm->lock);
2185         rc = kvm->arch.use_esca ? 0 : sca_switch_to_extended(kvm);
2186         mutex_unlock(&kvm->lock);
2187
2188         return rc == 0 && id < KVM_S390_ESCA_CPU_SLOTS;
2189 }
2190
2191 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
2192 {
2193         vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
2194         kvm_clear_async_pf_completion_queue(vcpu);
2195         vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
2196                                     KVM_SYNC_GPRS |
2197                                     KVM_SYNC_ACRS |
2198                                     KVM_SYNC_CRS |
2199                                     KVM_SYNC_ARCH0 |
2200                                     KVM_SYNC_PFAULT;
2201         kvm_s390_set_prefix(vcpu, 0);
2202         if (test_kvm_facility(vcpu->kvm, 64))
2203                 vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;
2204         if (test_kvm_facility(vcpu->kvm, 133))
2205                 vcpu->run->kvm_valid_regs |= KVM_SYNC_GSCB;
2206         /* fprs can be synchronized via vrs, even if the guest has no vx. With
2207          * MACHINE_HAS_VX, (load|store)_fpu_regs() will work with vrs format.
2208          */
2209         if (MACHINE_HAS_VX)
2210                 vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS;
2211         else
2212                 vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS;
2213
2214         if (kvm_is_ucontrol(vcpu->kvm))
2215                 return __kvm_ucontrol_vcpu_init(vcpu);
2216
2217         return 0;
2218 }
2219
2220 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2221 static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2222 {
2223         WARN_ON_ONCE(vcpu->arch.cputm_start != 0);
2224         raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2225         vcpu->arch.cputm_start = get_tod_clock_fast();
2226         raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2227 }
2228
2229 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2230 static void __stop_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2231 {
2232         WARN_ON_ONCE(vcpu->arch.cputm_start == 0);
2233         raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2234         vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start;
2235         vcpu->arch.cputm_start = 0;
2236         raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2237 }
2238
2239 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2240 static void __enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2241 {
2242         WARN_ON_ONCE(vcpu->arch.cputm_enabled);
2243         vcpu->arch.cputm_enabled = true;
2244         __start_cpu_timer_accounting(vcpu);
2245 }
2246
2247 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2248 static void __disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2249 {
2250         WARN_ON_ONCE(!vcpu->arch.cputm_enabled);
2251         __stop_cpu_timer_accounting(vcpu);
2252         vcpu->arch.cputm_enabled = false;
2253 }
2254
2255 static void enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2256 {
2257         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2258         __enable_cpu_timer_accounting(vcpu);
2259         preempt_enable();
2260 }
2261
2262 static void disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2263 {
2264         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2265         __disable_cpu_timer_accounting(vcpu);
2266         preempt_enable();
2267 }
2268
2269 /* set the cpu timer - may only be called from the VCPU thread itself */
2270 void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm)
2271 {
2272         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2273         raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2274         if (vcpu->arch.cputm_enabled)
2275                 vcpu->arch.cputm_start = get_tod_clock_fast();
2276         vcpu->arch.sie_block->cputm = cputm;
2277         raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2278         preempt_enable();
2279 }
2280
2281 /* update and get the cpu timer - can also be called from other VCPU threads */
2282 __u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu)
2283 {
2284         unsigned int seq;
2285         __u64 value;
2286
2287         if (unlikely(!vcpu->arch.cputm_enabled))
2288                 return vcpu->arch.sie_block->cputm;
2289
2290         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2291         do {
2292                 seq = raw_read_seqcount(&vcpu->arch.cputm_seqcount);
2293                 /*
2294                  * If the writer would ever execute a read in the critical
2295                  * section, e.g. in irq context, we have a deadlock.
2296                  */
2297                 WARN_ON_ONCE((seq & 1) && smp_processor_id() == vcpu->cpu);
2298                 value = vcpu->arch.sie_block->cputm;
2299                 /* if cputm_start is 0, accounting is being started/stopped */
2300                 if (likely(vcpu->arch.cputm_start))
2301                         value -= get_tod_clock_fast() - vcpu->arch.cputm_start;
2302         } while (read_seqcount_retry(&vcpu->arch.cputm_seqcount, seq & ~1));
2303         preempt_enable();
2304         return value;
2305 }
2306
2307 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
2308 {
2309
2310         gmap_enable(vcpu->arch.enabled_gmap);
2311         atomic_or(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
2312         if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
2313                 __start_cpu_timer_accounting(vcpu);
2314         vcpu->cpu = cpu;
2315 }
2316
2317 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
2318 {
2319         vcpu->cpu = -1;
2320         if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
2321                 __stop_cpu_timer_accounting(vcpu);
2322         atomic_andnot(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
2323         vcpu->arch.enabled_gmap = gmap_get_enabled();
2324         gmap_disable(vcpu->arch.enabled_gmap);
2325
2326 }
2327
2328 static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
2329 {
2330         /* this equals initial cpu reset in pop, but we don't switch to ESA */
2331         vcpu->arch.sie_block->gpsw.mask = 0UL;
2332         vcpu->arch.sie_block->gpsw.addr = 0UL;
2333         kvm_s390_set_prefix(vcpu, 0);
2334         kvm_s390_set_cpu_timer(vcpu, 0);
2335         vcpu->arch.sie_block->ckc       = 0UL;
2336         vcpu->arch.sie_block->todpr     = 0;
2337         memset(vcpu->arch.sie_block->gcr, 0, 16 * sizeof(__u64));
2338         vcpu->arch.sie_block->gcr[0]  = 0xE0UL;
2339         vcpu->arch.sie_block->gcr[14] = 0xC2000000UL;
2340         /* make sure the new fpc will be lazily loaded */
2341         save_fpu_regs();
2342         current->thread.fpu.fpc = 0;
2343         vcpu->arch.sie_block->gbea = 1;
2344         vcpu->arch.sie_block->pp = 0;
2345         vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
2346         kvm_clear_async_pf_completion_queue(vcpu);
2347         if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
2348                 kvm_s390_vcpu_stop(vcpu);
2349         kvm_s390_clear_local_irqs(vcpu);
2350 }
2351
2352 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
2353 {
2354         mutex_lock(&vcpu->kvm->lock);
2355         preempt_disable();
2356         vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch;
2357         preempt_enable();
2358         mutex_unlock(&vcpu->kvm->lock);
2359         if (!kvm_is_ucontrol(vcpu->kvm)) {
2360                 vcpu->arch.gmap = vcpu->kvm->arch.gmap;
2361                 sca_add_vcpu(vcpu);
2362         }
2363         if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0)
2364                 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
2365         /* make vcpu_load load the right gmap on the first trigger */
2366         vcpu->arch.enabled_gmap = vcpu->arch.gmap;
2367 }
2368
2369 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
2370 {
2371         if (!test_kvm_facility(vcpu->kvm, 76))
2372                 return;
2373
2374         vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA);
2375
2376         if (vcpu->kvm->arch.crypto.aes_kw)
2377                 vcpu->arch.sie_block->ecb3 |= ECB3_AES;
2378         if (vcpu->kvm->arch.crypto.dea_kw)
2379                 vcpu->arch.sie_block->ecb3 |= ECB3_DEA;
2380
2381         vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd;
2382 }
2383
2384 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu)
2385 {
2386         free_page(vcpu->arch.sie_block->cbrlo);
2387         vcpu->arch.sie_block->cbrlo = 0;
2388 }
2389
2390 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu)
2391 {
2392         vcpu->arch.sie_block->cbrlo = get_zeroed_page(GFP_KERNEL);
2393         if (!vcpu->arch.sie_block->cbrlo)
2394                 return -ENOMEM;
2395
2396         vcpu->arch.sie_block->ecb2 &= ~ECB2_PFMFI;
2397         return 0;
2398 }
2399
2400 static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu)
2401 {
2402         struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model;
2403
2404         vcpu->arch.sie_block->ibc = model->ibc;
2405         if (test_kvm_facility(vcpu->kvm, 7))
2406                 vcpu->arch.sie_block->fac = (u32)(u64) model->fac_list;
2407 }
2408
2409 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
2410 {
2411         int rc = 0;
2412
2413         atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
2414                                                     CPUSTAT_SM |
2415                                                     CPUSTAT_STOPPED);
2416
2417         if (test_kvm_facility(vcpu->kvm, 78))
2418                 atomic_or(CPUSTAT_GED2, &vcpu->arch.sie_block->cpuflags);
2419         else if (test_kvm_facility(vcpu->kvm, 8))
2420                 atomic_or(CPUSTAT_GED, &vcpu->arch.sie_block->cpuflags);
2421
2422         kvm_s390_vcpu_setup_model(vcpu);
2423
2424         /* pgste_set_pte has special handling for !MACHINE_HAS_ESOP */
2425         if (MACHINE_HAS_ESOP)
2426                 vcpu->arch.sie_block->ecb |= ECB_HOSTPROTINT;
2427         if (test_kvm_facility(vcpu->kvm, 9))
2428                 vcpu->arch.sie_block->ecb |= ECB_SRSI;
2429         if (test_kvm_facility(vcpu->kvm, 73))
2430                 vcpu->arch.sie_block->ecb |= ECB_TE;
2431
2432         if (test_kvm_facility(vcpu->kvm, 8) && sclp.has_pfmfi)
2433                 vcpu->arch.sie_block->ecb2 |= ECB2_PFMFI;
2434         if (test_kvm_facility(vcpu->kvm, 130))
2435                 vcpu->arch.sie_block->ecb2 |= ECB2_IEP;
2436         vcpu->arch.sie_block->eca = ECA_MVPGI | ECA_PROTEXCI;
2437         if (sclp.has_cei)
2438                 vcpu->arch.sie_block->eca |= ECA_CEI;
2439         if (sclp.has_ib)
2440                 vcpu->arch.sie_block->eca |= ECA_IB;
2441         if (sclp.has_siif)
2442                 vcpu->arch.sie_block->eca |= ECA_SII;
2443         if (sclp.has_sigpif)
2444                 vcpu->arch.sie_block->eca |= ECA_SIGPI;
2445         if (test_kvm_facility(vcpu->kvm, 129)) {
2446                 vcpu->arch.sie_block->eca |= ECA_VX;
2447                 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
2448         }
2449         if (test_kvm_facility(vcpu->kvm, 139))
2450                 vcpu->arch.sie_block->ecd |= ECD_MEF;
2451
2452         vcpu->arch.sie_block->sdnxo = ((unsigned long) &vcpu->run->s.regs.sdnx)
2453                                         | SDNXC;
2454         vcpu->arch.sie_block->riccbd = (unsigned long) &vcpu->run->s.regs.riccb;
2455
2456         if (sclp.has_kss)
2457                 atomic_or(CPUSTAT_KSS, &vcpu->arch.sie_block->cpuflags);
2458         else
2459                 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
2460
2461         if (vcpu->kvm->arch.use_cmma) {
2462                 rc = kvm_s390_vcpu_setup_cmma(vcpu);
2463                 if (rc)
2464                         return rc;
2465         }
2466         hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
2467         vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
2468
2469         kvm_s390_vcpu_crypto_setup(vcpu);
2470
2471         return rc;
2472 }
2473
2474 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
2475                                       unsigned int id)
2476 {
2477         struct kvm_vcpu *vcpu;
2478         struct sie_page *sie_page;
2479         int rc = -EINVAL;
2480
2481         if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id))
2482                 goto out;
2483
2484         rc = -ENOMEM;
2485
2486         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
2487         if (!vcpu)
2488                 goto out;
2489
2490         BUILD_BUG_ON(sizeof(struct sie_page) != 4096);
2491         sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL);
2492         if (!sie_page)
2493                 goto out_free_cpu;
2494
2495         vcpu->arch.sie_block = &sie_page->sie_block;
2496         vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb;
2497
2498         /* the real guest size will always be smaller than msl */
2499         vcpu->arch.sie_block->mso = 0;
2500         vcpu->arch.sie_block->msl = sclp.hamax;
2501
2502         vcpu->arch.sie_block->icpua = id;
2503         spin_lock_init(&vcpu->arch.local_int.lock);
2504         vcpu->arch.local_int.float_int = &kvm->arch.float_int;
2505         vcpu->arch.local_int.wq = &vcpu->wq;
2506         vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags;
2507         seqcount_init(&vcpu->arch.cputm_seqcount);
2508
2509         rc = kvm_vcpu_init(vcpu, kvm, id);
2510         if (rc)
2511                 goto out_free_sie_block;
2512         VM_EVENT(kvm, 3, "create cpu %d at 0x%pK, sie block at 0x%pK", id, vcpu,
2513                  vcpu->arch.sie_block);
2514         trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block);
2515
2516         return vcpu;
2517 out_free_sie_block:
2518         free_page((unsigned long)(vcpu->arch.sie_block));
2519 out_free_cpu:
2520         kmem_cache_free(kvm_vcpu_cache, vcpu);
2521 out:
2522         return ERR_PTR(rc);
2523 }
2524
2525 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
2526 {
2527         return kvm_s390_vcpu_has_irq(vcpu, 0);
2528 }
2529
2530 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu)
2531 {
2532         atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
2533         exit_sie(vcpu);
2534 }
2535
2536 void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu)
2537 {
2538         atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
2539 }
2540
2541 static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu)
2542 {
2543         atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
2544         exit_sie(vcpu);
2545 }
2546
2547 static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu)
2548 {
2549         atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
2550 }
2551
2552 /*
2553  * Kick a guest cpu out of SIE and wait until SIE is not running.
2554  * If the CPU is not running (e.g. waiting as idle) the function will
2555  * return immediately. */
2556 void exit_sie(struct kvm_vcpu *vcpu)
2557 {
2558         atomic_or(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags);
2559         while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE)
2560                 cpu_relax();
2561 }
2562
2563 /* Kick a guest cpu out of SIE to process a request synchronously */
2564 void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu)
2565 {
2566         kvm_make_request(req, vcpu);
2567         kvm_s390_vcpu_request(vcpu);
2568 }
2569
2570 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
2571                               unsigned long end)
2572 {
2573         struct kvm *kvm = gmap->private;
2574         struct kvm_vcpu *vcpu;
2575         unsigned long prefix;
2576         int i;
2577
2578         if (gmap_is_shadow(gmap))
2579                 return;
2580         if (start >= 1UL << 31)
2581                 /* We are only interested in prefix pages */
2582                 return;
2583         kvm_for_each_vcpu(i, vcpu, kvm) {
2584                 /* match against both prefix pages */
2585                 prefix = kvm_s390_get_prefix(vcpu);
2586                 if (prefix <= end && start <= prefix + 2*PAGE_SIZE - 1) {
2587                         VCPU_EVENT(vcpu, 2, "gmap notifier for %lx-%lx",
2588                                    start, end);
2589                         kvm_s390_sync_request(KVM_REQ_MMU_RELOAD, vcpu);
2590                 }
2591         }
2592 }
2593
2594 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
2595 {
2596         /* kvm common code refers to this, but never calls it */
2597         BUG();
2598         return 0;
2599 }
2600
2601 static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
2602                                            struct kvm_one_reg *reg)
2603 {
2604         int r = -EINVAL;
2605
2606         switch (reg->id) {
2607         case KVM_REG_S390_TODPR:
2608                 r = put_user(vcpu->arch.sie_block->todpr,
2609                              (u32 __user *)reg->addr);
2610                 break;
2611         case KVM_REG_S390_EPOCHDIFF:
2612                 r = put_user(vcpu->arch.sie_block->epoch,
2613                              (u64 __user *)reg->addr);
2614                 break;
2615         case KVM_REG_S390_CPU_TIMER:
2616                 r = put_user(kvm_s390_get_cpu_timer(vcpu),
2617                              (u64 __user *)reg->addr);
2618                 break;
2619         case KVM_REG_S390_CLOCK_COMP:
2620                 r = put_user(vcpu->arch.sie_block->ckc,
2621                              (u64 __user *)reg->addr);
2622                 break;
2623         case KVM_REG_S390_PFTOKEN:
2624                 r = put_user(vcpu->arch.pfault_token,
2625                              (u64 __user *)reg->addr);
2626                 break;
2627         case KVM_REG_S390_PFCOMPARE:
2628                 r = put_user(vcpu->arch.pfault_compare,
2629                              (u64 __user *)reg->addr);
2630                 break;
2631         case KVM_REG_S390_PFSELECT:
2632                 r = put_user(vcpu->arch.pfault_select,
2633                              (u64 __user *)reg->addr);
2634                 break;
2635         case KVM_REG_S390_PP:
2636                 r = put_user(vcpu->arch.sie_block->pp,
2637                              (u64 __user *)reg->addr);
2638                 break;
2639         case KVM_REG_S390_GBEA:
2640                 r = put_user(vcpu->arch.sie_block->gbea,
2641                              (u64 __user *)reg->addr);
2642                 break;
2643         default:
2644                 break;
2645         }
2646
2647         return r;
2648 }
2649
2650 static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
2651                                            struct kvm_one_reg *reg)
2652 {
2653         int r = -EINVAL;
2654         __u64 val;
2655
2656         switch (reg->id) {
2657         case KVM_REG_S390_TODPR:
2658                 r = get_user(vcpu->arch.sie_block->todpr,
2659                              (u32 __user *)reg->addr);
2660                 break;
2661         case KVM_REG_S390_EPOCHDIFF:
2662                 r = get_user(vcpu->arch.sie_block->epoch,
2663                              (u64 __user *)reg->addr);
2664                 break;
2665         case KVM_REG_S390_CPU_TIMER:
2666                 r = get_user(val, (u64 __user *)reg->addr);
2667                 if (!r)
2668                         kvm_s390_set_cpu_timer(vcpu, val);
2669                 break;
2670         case KVM_REG_S390_CLOCK_COMP:
2671                 r = get_user(vcpu->arch.sie_block->ckc,
2672                              (u64 __user *)reg->addr);
2673                 break;
2674         case KVM_REG_S390_PFTOKEN:
2675                 r = get_user(vcpu->arch.pfault_token,
2676                              (u64 __user *)reg->addr);
2677                 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
2678                         kvm_clear_async_pf_completion_queue(vcpu);
2679                 break;
2680         case KVM_REG_S390_PFCOMPARE:
2681                 r = get_user(vcpu->arch.pfault_compare,
2682                              (u64 __user *)reg->addr);
2683                 break;
2684         case KVM_REG_S390_PFSELECT:
2685                 r = get_user(vcpu->arch.pfault_select,
2686                              (u64 __user *)reg->addr);
2687                 break;
2688         case KVM_REG_S390_PP:
2689                 r = get_user(vcpu->arch.sie_block->pp,
2690                              (u64 __user *)reg->addr);
2691                 break;
2692         case KVM_REG_S390_GBEA:
2693                 r = get_user(vcpu->arch.sie_block->gbea,
2694                              (u64 __user *)reg->addr);
2695                 break;
2696         default:
2697                 break;
2698         }
2699
2700         return r;
2701 }
2702
2703 static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
2704 {
2705         kvm_s390_vcpu_initial_reset(vcpu);
2706         return 0;
2707 }
2708
2709 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
2710 {
2711         memcpy(&vcpu->run->s.regs.gprs, &regs->gprs, sizeof(regs->gprs));
2712         return 0;
2713 }
2714
2715 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
2716 {
2717         memcpy(&regs->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs));
2718         return 0;
2719 }
2720
2721 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2722                                   struct kvm_sregs *sregs)
2723 {
2724         memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs));
2725         memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));
2726         return 0;
2727 }
2728
2729 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
2730                                   struct kvm_sregs *sregs)
2731 {
2732         memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs));
2733         memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs));
2734         return 0;
2735 }
2736
2737 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2738 {
2739         if (test_fp_ctl(fpu->fpc))
2740                 return -EINVAL;
2741         vcpu->run->s.regs.fpc = fpu->fpc;
2742         if (MACHINE_HAS_VX)
2743                 convert_fp_to_vx((__vector128 *) vcpu->run->s.regs.vrs,
2744                                  (freg_t *) fpu->fprs);
2745         else
2746                 memcpy(vcpu->run->s.regs.fprs, &fpu->fprs, sizeof(fpu->fprs));
2747         return 0;
2748 }
2749
2750 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2751 {
2752         /* make sure we have the latest values */
2753         save_fpu_regs();
2754         if (MACHINE_HAS_VX)
2755                 convert_vx_to_fp((freg_t *) fpu->fprs,
2756                                  (__vector128 *) vcpu->run->s.regs.vrs);
2757         else
2758                 memcpy(fpu->fprs, vcpu->run->s.regs.fprs, sizeof(fpu->fprs));
2759         fpu->fpc = vcpu->run->s.regs.fpc;
2760         return 0;
2761 }
2762
2763 static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
2764 {
2765         int rc = 0;
2766
2767         if (!is_vcpu_stopped(vcpu))
2768                 rc = -EBUSY;
2769         else {
2770                 vcpu->run->psw_mask = psw.mask;
2771                 vcpu->run->psw_addr = psw.addr;
2772         }
2773         return rc;
2774 }
2775
2776 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2777                                   struct kvm_translation *tr)
2778 {
2779         return -EINVAL; /* not implemented yet */
2780 }
2781
2782 #define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \
2783                               KVM_GUESTDBG_USE_HW_BP | \
2784                               KVM_GUESTDBG_ENABLE)
2785
2786 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
2787                                         struct kvm_guest_debug *dbg)
2788 {
2789         int rc = 0;
2790
2791         vcpu->guest_debug = 0;
2792         kvm_s390_clear_bp_data(vcpu);
2793
2794         if (dbg->control & ~VALID_GUESTDBG_FLAGS)
2795                 return -EINVAL;
2796         if (!sclp.has_gpere)
2797                 return -EINVAL;
2798
2799         if (dbg->control & KVM_GUESTDBG_ENABLE) {
2800                 vcpu->guest_debug = dbg->control;
2801                 /* enforce guest PER */
2802                 atomic_or(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2803
2804                 if (dbg->control & KVM_GUESTDBG_USE_HW_BP)
2805                         rc = kvm_s390_import_bp_data(vcpu, dbg);
2806         } else {
2807                 atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2808                 vcpu->arch.guestdbg.last_bp = 0;
2809         }
2810
2811         if (rc) {
2812                 vcpu->guest_debug = 0;
2813                 kvm_s390_clear_bp_data(vcpu);
2814                 atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2815         }
2816
2817         return rc;
2818 }
2819
2820 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
2821                                     struct kvm_mp_state *mp_state)
2822 {
2823         /* CHECK_STOP and LOAD are not supported yet */
2824         return is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED :
2825                                        KVM_MP_STATE_OPERATING;
2826 }
2827
2828 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
2829                                     struct kvm_mp_state *mp_state)
2830 {
2831         int rc = 0;
2832
2833         /* user space knows about this interface - let it control the state */
2834         vcpu->kvm->arch.user_cpu_state_ctrl = 1;
2835
2836         switch (mp_state->mp_state) {
2837         case KVM_MP_STATE_STOPPED:
2838                 kvm_s390_vcpu_stop(vcpu);
2839                 break;
2840         case KVM_MP_STATE_OPERATING:
2841                 kvm_s390_vcpu_start(vcpu);
2842                 break;
2843         case KVM_MP_STATE_LOAD:
2844         case KVM_MP_STATE_CHECK_STOP:
2845                 /* fall through - CHECK_STOP and LOAD are not supported yet */
2846         default:
2847                 rc = -ENXIO;
2848         }
2849
2850         return rc;
2851 }
2852
2853 static bool ibs_enabled(struct kvm_vcpu *vcpu)
2854 {
2855         return atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_IBS;
2856 }
2857
2858 static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
2859 {
2860 retry:
2861         kvm_s390_vcpu_request_handled(vcpu);
2862         if (!kvm_request_pending(vcpu))
2863                 return 0;
2864         /*
2865          * We use MMU_RELOAD just to re-arm the ipte notifier for the
2866          * guest prefix page. gmap_mprotect_notify will wait on the ptl lock.
2867          * This ensures that the ipte instruction for this request has
2868          * already finished. We might race against a second unmapper that
2869          * wants to set the blocking bit. Lets just retry the request loop.
2870          */
2871         if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) {
2872                 int rc;
2873                 rc = gmap_mprotect_notify(vcpu->arch.gmap,
2874                                           kvm_s390_get_prefix(vcpu),
2875                                           PAGE_SIZE * 2, PROT_WRITE);
2876                 if (rc) {
2877                         kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
2878                         return rc;
2879                 }
2880                 goto retry;
2881         }
2882
2883         if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
2884                 vcpu->arch.sie_block->ihcpu = 0xffff;
2885                 goto retry;
2886         }
2887
2888         if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) {
2889                 if (!ibs_enabled(vcpu)) {
2890                         trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1);
2891                         atomic_or(CPUSTAT_IBS,
2892                                         &vcpu->arch.sie_block->cpuflags);
2893                 }
2894                 goto retry;
2895         }
2896
2897         if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) {
2898                 if (ibs_enabled(vcpu)) {
2899                         trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0);
2900                         atomic_andnot(CPUSTAT_IBS,
2901                                           &vcpu->arch.sie_block->cpuflags);
2902                 }
2903                 goto retry;
2904         }
2905
2906         if (kvm_check_request(KVM_REQ_ICPT_OPEREXC, vcpu)) {
2907                 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
2908                 goto retry;
2909         }
2910
2911         if (kvm_check_request(KVM_REQ_START_MIGRATION, vcpu)) {
2912                 /*
2913                  * Disable CMMA virtualization; we will emulate the ESSA
2914                  * instruction manually, in order to provide additional
2915                  * functionalities needed for live migration.
2916                  */
2917                 vcpu->arch.sie_block->ecb2 &= ~ECB2_CMMA;
2918                 goto retry;
2919         }
2920
2921         if (kvm_check_request(KVM_REQ_STOP_MIGRATION, vcpu)) {
2922                 /*
2923                  * Re-enable CMMA virtualization if CMMA is available and
2924                  * was used.
2925                  */
2926                 if ((vcpu->kvm->arch.use_cmma) &&
2927                     (vcpu->kvm->mm->context.use_cmma))
2928                         vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
2929                 goto retry;
2930         }
2931
2932         /* nothing to do, just clear the request */
2933         kvm_clear_request(KVM_REQ_UNHALT, vcpu);
2934
2935         return 0;
2936 }
2937
2938 void kvm_s390_set_tod_clock_ext(struct kvm *kvm,
2939                                  const struct kvm_s390_vm_tod_clock *gtod)
2940 {
2941         struct kvm_vcpu *vcpu;
2942         struct kvm_s390_tod_clock_ext htod;
2943         int i;
2944
2945         mutex_lock(&kvm->lock);
2946         preempt_disable();
2947
2948         get_tod_clock_ext((char *)&htod);
2949
2950         kvm->arch.epoch = gtod->tod - htod.tod;
2951         kvm->arch.epdx = gtod->epoch_idx - htod.epoch_idx;
2952
2953         if (kvm->arch.epoch > gtod->tod)
2954                 kvm->arch.epdx -= 1;
2955
2956         kvm_s390_vcpu_block_all(kvm);
2957         kvm_for_each_vcpu(i, vcpu, kvm) {
2958                 vcpu->arch.sie_block->epoch = kvm->arch.epoch;
2959                 vcpu->arch.sie_block->epdx  = kvm->arch.epdx;
2960         }
2961
2962         kvm_s390_vcpu_unblock_all(kvm);
2963         preempt_enable();
2964         mutex_unlock(&kvm->lock);
2965 }
2966
2967 void kvm_s390_set_tod_clock(struct kvm *kvm, u64 tod)
2968 {
2969         struct kvm_vcpu *vcpu;
2970         int i;
2971
2972         mutex_lock(&kvm->lock);
2973         preempt_disable();
2974         kvm->arch.epoch = tod - get_tod_clock();
2975         kvm_s390_vcpu_block_all(kvm);
2976         kvm_for_each_vcpu(i, vcpu, kvm)
2977                 vcpu->arch.sie_block->epoch = kvm->arch.epoch;
2978         kvm_s390_vcpu_unblock_all(kvm);
2979         preempt_enable();
2980         mutex_unlock(&kvm->lock);
2981 }
2982
2983 /**
2984  * kvm_arch_fault_in_page - fault-in guest page if necessary
2985  * @vcpu: The corresponding virtual cpu
2986  * @gpa: Guest physical address
2987  * @writable: Whether the page should be writable or not
2988  *
2989  * Make sure that a guest page has been faulted-in on the host.
2990  *
2991  * Return: Zero on success, negative error code otherwise.
2992  */
2993 long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable)
2994 {
2995         return gmap_fault(vcpu->arch.gmap, gpa,
2996                           writable ? FAULT_FLAG_WRITE : 0);
2997 }
2998
2999 static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token,
3000                                       unsigned long token)
3001 {
3002         struct kvm_s390_interrupt inti;
3003         struct kvm_s390_irq irq;
3004
3005         if (start_token) {
3006                 irq.u.ext.ext_params2 = token;
3007                 irq.type = KVM_S390_INT_PFAULT_INIT;
3008                 WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq));
3009         } else {
3010                 inti.type = KVM_S390_INT_PFAULT_DONE;
3011                 inti.parm64 = token;
3012                 WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti));
3013         }
3014 }
3015
3016 void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
3017                                      struct kvm_async_pf *work)
3018 {
3019         trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token);
3020         __kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token);
3021 }
3022
3023 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
3024                                  struct kvm_async_pf *work)
3025 {
3026         trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token);
3027         __kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token);
3028 }
3029
3030 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu,
3031                                struct kvm_async_pf *work)
3032 {
3033         /* s390 will always inject the page directly */
3034 }
3035
3036 bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu)
3037 {
3038         /*
3039          * s390 will always inject the page directly,
3040          * but we still want check_async_completion to cleanup
3041          */
3042         return true;
3043 }
3044
3045 static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu)
3046 {
3047         hva_t hva;
3048         struct kvm_arch_async_pf arch;
3049         int rc;
3050
3051         if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
3052                 return 0;
3053         if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) !=
3054             vcpu->arch.pfault_compare)
3055                 return 0;
3056         if (psw_extint_disabled(vcpu))
3057                 return 0;
3058         if (kvm_s390_vcpu_has_irq(vcpu, 0))
3059                 return 0;
3060         if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
3061                 return 0;
3062         if (!vcpu->arch.gmap->pfault_enabled)
3063                 return 0;
3064
3065         hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr));
3066         hva += current->thread.gmap_addr & ~PAGE_MASK;
3067         if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8))
3068                 return 0;
3069
3070         rc = kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch);
3071         return rc;
3072 }
3073
3074 static int vcpu_pre_run(struct kvm_vcpu *vcpu)
3075 {
3076         int rc, cpuflags;
3077
3078         /*
3079          * On s390 notifications for arriving pages will be delivered directly
3080          * to the guest but the house keeping for completed pfaults is
3081          * handled outside the worker.
3082          */
3083         kvm_check_async_pf_completion(vcpu);
3084
3085         vcpu->arch.sie_block->gg14 = vcpu->run->s.regs.gprs[14];
3086         vcpu->arch.sie_block->gg15 = vcpu->run->s.regs.gprs[15];
3087
3088         if (need_resched())
3089                 schedule();
3090
3091         if (test_cpu_flag(CIF_MCCK_PENDING))
3092                 s390_handle_mcck();
3093
3094         if (!kvm_is_ucontrol(vcpu->kvm)) {
3095                 rc = kvm_s390_deliver_pending_interrupts(vcpu);
3096                 if (rc)
3097                         return rc;
3098         }
3099
3100         rc = kvm_s390_handle_requests(vcpu);
3101         if (rc)
3102                 return rc;
3103
3104         if (guestdbg_enabled(vcpu)) {
3105                 kvm_s390_backup_guest_per_regs(vcpu);
3106                 kvm_s390_patch_guest_per_regs(vcpu);
3107         }
3108
3109         vcpu->arch.sie_block->icptcode = 0;
3110         cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags);
3111         VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags);
3112         trace_kvm_s390_sie_enter(vcpu, cpuflags);
3113
3114         return 0;
3115 }
3116
3117 static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu)
3118 {
3119         struct kvm_s390_pgm_info pgm_info = {
3120                 .code = PGM_ADDRESSING,
3121         };
3122         u8 opcode, ilen;
3123         int rc;
3124
3125         VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction");
3126         trace_kvm_s390_sie_fault(vcpu);
3127
3128         /*
3129          * We want to inject an addressing exception, which is defined as a
3130          * suppressing or terminating exception. However, since we came here
3131          * by a DAT access exception, the PSW still points to the faulting
3132          * instruction since DAT exceptions are nullifying. So we've got
3133          * to look up the current opcode to get the length of the instruction
3134          * to be able to forward the PSW.
3135          */
3136         rc = read_guest_instr(vcpu, vcpu->arch.sie_block->gpsw.addr, &opcode, 1);
3137         ilen = insn_length(opcode);
3138         if (rc < 0) {
3139                 return rc;
3140         } else if (rc) {
3141                 /* Instruction-Fetching Exceptions - we can't detect the ilen.
3142                  * Forward by arbitrary ilc, injection will take care of
3143                  * nullification if necessary.
3144                  */
3145                 pgm_info = vcpu->arch.pgm;
3146                 ilen = 4;
3147         }
3148         pgm_info.flags = ilen | KVM_S390_PGM_FLAGS_ILC_VALID;
3149         kvm_s390_forward_psw(vcpu, ilen);
3150         return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
3151 }
3152
3153 static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason)
3154 {
3155         struct mcck_volatile_info *mcck_info;
3156         struct sie_page *sie_page;
3157
3158         VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
3159                    vcpu->arch.sie_block->icptcode);
3160         trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);
3161
3162         if (guestdbg_enabled(vcpu))
3163                 kvm_s390_restore_guest_per_regs(vcpu);
3164
3165         vcpu->run->s.regs.gprs[14] = vcpu->arch.sie_block->gg14;
3166         vcpu->run->s.regs.gprs[15] = vcpu->arch.sie_block->gg15;
3167
3168         if (exit_reason == -EINTR) {
3169                 VCPU_EVENT(vcpu, 3, "%s", "machine check");
3170                 sie_page = container_of(vcpu->arch.sie_block,
3171                                         struct sie_page, sie_block);
3172                 mcck_info = &sie_page->mcck_info;
3173                 kvm_s390_reinject_machine_check(vcpu, mcck_info);
3174                 return 0;
3175         }
3176
3177         if (vcpu->arch.sie_block->icptcode > 0) {
3178                 int rc = kvm_handle_sie_intercept(vcpu);
3179
3180                 if (rc != -EOPNOTSUPP)
3181                         return rc;
3182                 vcpu->run->exit_reason = KVM_EXIT_S390_SIEIC;
3183                 vcpu->run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode;
3184                 vcpu->run->s390_sieic.ipa = vcpu->arch.sie_block->ipa;
3185                 vcpu->run->s390_sieic.ipb = vcpu->arch.sie_block->ipb;
3186                 return -EREMOTE;
3187         } else if (exit_reason != -EFAULT) {
3188                 vcpu->stat.exit_null++;
3189                 return 0;
3190         } else if (kvm_is_ucontrol(vcpu->kvm)) {
3191                 vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL;
3192                 vcpu->run->s390_ucontrol.trans_exc_code =
3193                                                 current->thread.gmap_addr;
3194                 vcpu->run->s390_ucontrol.pgm_code = 0x10;
3195                 return -EREMOTE;
3196         } else if (current->thread.gmap_pfault) {
3197                 trace_kvm_s390_major_guest_pfault(vcpu);
3198                 current->thread.gmap_pfault = 0;
3199                 if (kvm_arch_setup_async_pf(vcpu))
3200                         return 0;
3201                 return kvm_arch_fault_in_page(vcpu, current->thread.gmap_addr, 1);
3202         }
3203         return vcpu_post_run_fault_in_sie(vcpu);
3204 }
3205
3206 static int __vcpu_run(struct kvm_vcpu *vcpu)
3207 {
3208         int rc, exit_reason;
3209
3210         /*
3211          * We try to hold kvm->srcu during most of vcpu_run (except when run-
3212          * ning the guest), so that memslots (and other stuff) are protected
3213          */
3214         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
3215
3216         do {
3217                 rc = vcpu_pre_run(vcpu);
3218                 if (rc)
3219                         break;
3220
3221                 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
3222                 /*
3223                  * As PF_VCPU will be used in fault handler, between
3224                  * guest_enter and guest_exit should be no uaccess.
3225                  */
3226                 local_irq_disable();
3227                 guest_enter_irqoff();
3228                 __disable_cpu_timer_accounting(vcpu);
3229                 local_irq_enable();
3230                 exit_reason = sie64a(vcpu->arch.sie_block,
3231                                      vcpu->run->s.regs.gprs);
3232                 local_irq_disable();
3233                 __enable_cpu_timer_accounting(vcpu);
3234                 guest_exit_irqoff();
3235                 local_irq_enable();
3236                 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
3237
3238                 rc = vcpu_post_run(vcpu, exit_reason);
3239         } while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc);
3240
3241         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
3242         return rc;
3243 }
3244
3245 static void sync_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3246 {
3247         struct runtime_instr_cb *riccb;
3248         struct gs_cb *gscb;
3249
3250         riccb = (struct runtime_instr_cb *) &kvm_run->s.regs.riccb;
3251         gscb = (struct gs_cb *) &kvm_run->s.regs.gscb;
3252         vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
3253         vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
3254         if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX)
3255                 kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
3256         if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) {
3257                 memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128);
3258                 /* some control register changes require a tlb flush */
3259                 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
3260         }
3261         if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
3262                 kvm_s390_set_cpu_timer(vcpu, kvm_run->s.regs.cputm);
3263                 vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc;
3264                 vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr;
3265                 vcpu->arch.sie_block->pp = kvm_run->s.regs.pp;
3266                 vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea;
3267         }
3268         if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) {
3269                 vcpu->arch.pfault_token = kvm_run->s.regs.pft;
3270                 vcpu->arch.pfault_select = kvm_run->s.regs.pfs;
3271                 vcpu->arch.pfault_compare = kvm_run->s.regs.pfc;
3272                 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
3273                         kvm_clear_async_pf_completion_queue(vcpu);
3274         }
3275         /*
3276          * If userspace sets the riccb (e.g. after migration) to a valid state,
3277          * we should enable RI here instead of doing the lazy enablement.
3278          */
3279         if ((kvm_run->kvm_dirty_regs & KVM_SYNC_RICCB) &&
3280             test_kvm_facility(vcpu->kvm, 64) &&
3281             riccb->valid &&
3282             !(vcpu->arch.sie_block->ecb3 & ECB3_RI)) {
3283                 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (sync_regs)");
3284                 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
3285         }
3286         /*
3287          * If userspace sets the gscb (e.g. after migration) to non-zero,
3288          * we should enable GS here instead of doing the lazy enablement.
3289          */
3290         if ((kvm_run->kvm_dirty_regs & KVM_SYNC_GSCB) &&
3291             test_kvm_facility(vcpu->kvm, 133) &&
3292             gscb->gssm &&
3293             !vcpu->arch.gs_enabled) {
3294                 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (sync_regs)");
3295                 vcpu->arch.sie_block->ecb |= ECB_GS;
3296                 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
3297                 vcpu->arch.gs_enabled = 1;
3298         }
3299         save_access_regs(vcpu->arch.host_acrs);
3300         restore_access_regs(vcpu->run->s.regs.acrs);
3301         /* save host (userspace) fprs/vrs */
3302         save_fpu_regs();
3303         vcpu->arch.host_fpregs.fpc = current->thread.fpu.fpc;
3304         vcpu->arch.host_fpregs.regs = current->thread.fpu.regs;
3305         if (MACHINE_HAS_VX)
3306                 current->thread.fpu.regs = vcpu->run->s.regs.vrs;
3307         else
3308                 current->thread.fpu.regs = vcpu->run->s.regs.fprs;
3309         current->thread.fpu.fpc = vcpu->run->s.regs.fpc;
3310         if (test_fp_ctl(current->thread.fpu.fpc))
3311                 /* User space provided an invalid FPC, let's clear it */
3312                 current->thread.fpu.fpc = 0;
3313         if (MACHINE_HAS_GS) {
3314                 preempt_disable();
3315                 __ctl_set_bit(2, 4);
3316                 if (current->thread.gs_cb) {
3317                         vcpu->arch.host_gscb = current->thread.gs_cb;
3318                         save_gs_cb(vcpu->arch.host_gscb);
3319                 }
3320                 if (vcpu->arch.gs_enabled) {
3321                         current->thread.gs_cb = (struct gs_cb *)
3322                                                 &vcpu->run->s.regs.gscb;
3323                         restore_gs_cb(current->thread.gs_cb);
3324                 }
3325                 preempt_enable();
3326         }
3327
3328         kvm_run->kvm_dirty_regs = 0;
3329 }
3330
3331 static void store_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3332 {
3333         kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask;
3334         kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr;
3335         kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu);
3336         memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128);
3337         kvm_run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu);
3338         kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc;
3339         kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr;
3340         kvm_run->s.regs.pp = vcpu->arch.sie_block->pp;
3341         kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea;
3342         kvm_run->s.regs.pft = vcpu->arch.pfault_token;
3343         kvm_run->s.regs.pfs = vcpu->arch.pfault_select;
3344         kvm_run->s.regs.pfc = vcpu->arch.pfault_compare;
3345         save_access_regs(vcpu->run->s.regs.acrs);
3346         restore_access_regs(vcpu->arch.host_acrs);
3347         /* Save guest register state */
3348         save_fpu_regs();
3349         vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
3350         /* Restore will be done lazily at return */
3351         current->thread.fpu.fpc = vcpu->arch.host_fpregs.fpc;
3352         current->thread.fpu.regs = vcpu->arch.host_fpregs.regs;
3353         if (MACHINE_HAS_GS) {
3354                 __ctl_set_bit(2, 4);
3355                 if (vcpu->arch.gs_enabled)
3356                         save_gs_cb(current->thread.gs_cb);
3357                 preempt_disable();
3358                 current->thread.gs_cb = vcpu->arch.host_gscb;
3359                 restore_gs_cb(vcpu->arch.host_gscb);
3360                 preempt_enable();
3361                 if (!vcpu->arch.host_gscb)
3362                         __ctl_clear_bit(2, 4);
3363                 vcpu->arch.host_gscb = NULL;
3364         }
3365
3366 }
3367
3368 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3369 {
3370         int rc;
3371         sigset_t sigsaved;
3372
3373         if (kvm_run->immediate_exit)
3374                 return -EINTR;
3375
3376         if (guestdbg_exit_pending(vcpu)) {
3377                 kvm_s390_prepare_debug_exit(vcpu);
3378                 return 0;
3379         }
3380
3381         if (vcpu->sigset_active)
3382                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
3383
3384         if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) {
3385                 kvm_s390_vcpu_start(vcpu);
3386         } else if (is_vcpu_stopped(vcpu)) {
3387                 pr_err_ratelimited("can't run stopped vcpu %d\n",
3388                                    vcpu->vcpu_id);
3389                 return -EINVAL;
3390         }
3391
3392         sync_regs(vcpu, kvm_run);
3393         enable_cpu_timer_accounting(vcpu);
3394
3395         might_fault();
3396         rc = __vcpu_run(vcpu);
3397
3398         if (signal_pending(current) && !rc) {
3399                 kvm_run->exit_reason = KVM_EXIT_INTR;
3400                 rc = -EINTR;
3401         }
3402
3403         if (guestdbg_exit_pending(vcpu) && !rc)  {
3404                 kvm_s390_prepare_debug_exit(vcpu);
3405                 rc = 0;
3406         }
3407
3408         if (rc == -EREMOTE) {
3409                 /* userspace support is needed, kvm_run has been prepared */
3410                 rc = 0;
3411         }
3412
3413         disable_cpu_timer_accounting(vcpu);
3414         store_regs(vcpu, kvm_run);
3415
3416         if (vcpu->sigset_active)
3417                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
3418
3419         vcpu->stat.exit_userspace++;
3420         return rc;
3421 }
3422
3423 /*
3424  * store status at address
3425  * we use have two special cases:
3426  * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit
3427  * KVM_S390_STORE_STATUS_PREFIXED: -> prefix
3428  */
3429 int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa)
3430 {
3431         unsigned char archmode = 1;
3432         freg_t fprs[NUM_FPRS];
3433         unsigned int px;
3434         u64 clkcomp, cputm;
3435         int rc;
3436
3437         px = kvm_s390_get_prefix(vcpu);
3438         if (gpa == KVM_S390_STORE_STATUS_NOADDR) {
3439                 if (write_guest_abs(vcpu, 163, &archmode, 1))
3440                         return -EFAULT;
3441                 gpa = 0;
3442         } else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) {
3443                 if (write_guest_real(vcpu, 163, &archmode, 1))
3444                         return -EFAULT;
3445                 gpa = px;
3446         } else
3447                 gpa -= __LC_FPREGS_SAVE_AREA;
3448
3449         /* manually convert vector registers if necessary */
3450         if (MACHINE_HAS_VX) {
3451                 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
3452                 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
3453                                      fprs, 128);
3454         } else {
3455                 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
3456                                      vcpu->run->s.regs.fprs, 128);
3457         }
3458         rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA,
3459                               vcpu->run->s.regs.gprs, 128);
3460         rc |= write_guest_abs(vcpu, gpa + __LC_PSW_SAVE_AREA,
3461                               &vcpu->arch.sie_block->gpsw, 16);
3462         rc |= write_guest_abs(vcpu, gpa + __LC_PREFIX_SAVE_AREA,
3463                               &px, 4);
3464         rc |= write_guest_abs(vcpu, gpa + __LC_FP_CREG_SAVE_AREA,
3465                               &vcpu->run->s.regs.fpc, 4);
3466         rc |= write_guest_abs(vcpu, gpa + __LC_TOD_PROGREG_SAVE_AREA,
3467                               &vcpu->arch.sie_block->todpr, 4);
3468         cputm = kvm_s390_get_cpu_timer(vcpu);
3469         rc |= write_guest_abs(vcpu, gpa + __LC_CPU_TIMER_SAVE_AREA,
3470                               &cputm, 8);
3471         clkcomp = vcpu->arch.sie_block->ckc >> 8;
3472         rc |= write_guest_abs(vcpu, gpa + __LC_CLOCK_COMP_SAVE_AREA,
3473                               &clkcomp, 8);
3474         rc |= write_guest_abs(vcpu, gpa + __LC_AREGS_SAVE_AREA,
3475                               &vcpu->run->s.regs.acrs, 64);
3476         rc |= write_guest_abs(vcpu, gpa + __LC_CREGS_SAVE_AREA,
3477                               &vcpu->arch.sie_block->gcr, 128);
3478         return rc ? -EFAULT : 0;
3479 }
3480
3481 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
3482 {
3483         /*
3484          * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy
3485          * switch in the run ioctl. Let's update our copies before we save
3486          * it into the save area
3487          */
3488         save_fpu_regs();
3489         vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
3490         save_access_regs(vcpu->run->s.regs.acrs);
3491
3492         return kvm_s390_store_status_unloaded(vcpu, addr);
3493 }
3494
3495 static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
3496 {
3497         kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu);
3498         kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu);
3499 }
3500
3501 static void __disable_ibs_on_all_vcpus(struct kvm *kvm)
3502 {
3503         unsigned int i;
3504         struct kvm_vcpu *vcpu;
3505
3506         kvm_for_each_vcpu(i, vcpu, kvm) {
3507                 __disable_ibs_on_vcpu(vcpu);
3508         }
3509 }
3510
3511 static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
3512 {
3513         if (!sclp.has_ibs)
3514                 return;
3515         kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu);
3516         kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu);
3517 }
3518
3519 void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu)
3520 {
3521         int i, online_vcpus, started_vcpus = 0;
3522
3523         if (!is_vcpu_stopped(vcpu))
3524                 return;
3525
3526         trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1);
3527         /* Only one cpu at a time may enter/leave the STOPPED state. */
3528         spin_lock(&vcpu->kvm->arch.start_stop_lock);
3529         online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
3530
3531         for (i = 0; i < online_vcpus; i++) {
3532                 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i]))
3533                         started_vcpus++;
3534         }
3535
3536         if (started_vcpus == 0) {
3537                 /* we're the only active VCPU -> speed it up */
3538                 __enable_ibs_on_vcpu(vcpu);
3539         } else if (started_vcpus == 1) {
3540                 /*
3541                  * As we are starting a second VCPU, we have to disable
3542                  * the IBS facility on all VCPUs to remove potentially
3543                  * oustanding ENABLE requests.
3544                  */
3545                 __disable_ibs_on_all_vcpus(vcpu->kvm);
3546         }
3547
3548         atomic_andnot(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
3549         /*
3550          * Another VCPU might have used IBS while we were offline.
3551          * Let's play safe and flush the VCPU at startup.
3552          */
3553         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
3554         spin_unlock(&vcpu->kvm->arch.start_stop_lock);
3555         return;
3556 }
3557
3558 void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu)
3559 {
3560         int i, online_vcpus, started_vcpus = 0;
3561         struct kvm_vcpu *started_vcpu = NULL;
3562
3563         if (is_vcpu_stopped(vcpu))
3564                 return;
3565
3566         trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0);
3567         /* Only one cpu at a time may enter/leave the STOPPED state. */
3568         spin_lock(&vcpu->kvm->arch.start_stop_lock);
3569         online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
3570
3571         /* SIGP STOP and SIGP STOP AND STORE STATUS has been fully processed */
3572         kvm_s390_clear_stop_irq(vcpu);
3573
3574         atomic_or(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
3575         __disable_ibs_on_vcpu(vcpu);
3576
3577         for (i = 0; i < online_vcpus; i++) {
3578                 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i])) {
3579                         started_vcpus++;
3580                         started_vcpu = vcpu->kvm->vcpus[i];
3581                 }
3582         }
3583
3584         if (started_vcpus == 1) {
3585                 /*
3586                  * As we only have one VCPU left, we want to enable the
3587                  * IBS facility for that VCPU to speed it up.
3588                  */
3589                 __enable_ibs_on_vcpu(started_vcpu);
3590         }
3591
3592         spin_unlock(&vcpu->kvm->arch.start_stop_lock);
3593         return;
3594 }
3595
3596 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
3597                                      struct kvm_enable_cap *cap)
3598 {
3599         int r;
3600
3601         if (cap->flags)
3602                 return -EINVAL;
3603
3604         switch (cap->cap) {
3605         case KVM_CAP_S390_CSS_SUPPORT:
3606                 if (!vcpu->kvm->arch.css_support) {
3607                         vcpu->kvm->arch.css_support = 1;
3608                         VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support");
3609                         trace_kvm_s390_enable_css(vcpu->kvm);
3610                 }
3611                 r = 0;
3612                 break;
3613         default:
3614                 r = -EINVAL;
3615                 break;
3616         }
3617         return r;
3618 }
3619
3620 static long kvm_s390_guest_mem_op(struct kvm_vcpu *vcpu,
3621                                   struct kvm_s390_mem_op *mop)
3622 {
3623         void __user *uaddr = (void __user *)mop->buf;
3624         void *tmpbuf = NULL;
3625         int r, srcu_idx;
3626         const u64 supported_flags = KVM_S390_MEMOP_F_INJECT_EXCEPTION
3627                                     | KVM_S390_MEMOP_F_CHECK_ONLY;
3628
3629         if (mop->flags & ~supported_flags)
3630                 return -EINVAL;
3631
3632         if (mop->size > MEM_OP_MAX_SIZE)
3633                 return -E2BIG;
3634
3635         if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) {
3636                 tmpbuf = vmalloc(mop->size);
3637                 if (!tmpbuf)
3638                         return -ENOMEM;
3639         }
3640
3641         srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
3642
3643         switch (mop->op) {
3644         case KVM_S390_MEMOP_LOGICAL_READ:
3645                 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
3646                         r = check_gva_range(vcpu, mop->gaddr, mop->ar,
3647                                             mop->size, GACC_FETCH);
3648                         break;
3649                 }
3650                 r = read_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size);
3651                 if (r == 0) {
3652                         if (copy_to_user(uaddr, tmpbuf, mop->size))
3653                                 r = -EFAULT;
3654                 }
3655                 break;
3656         case KVM_S390_MEMOP_LOGICAL_WRITE:
3657                 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
3658                         r = check_gva_range(vcpu, mop->gaddr, mop->ar,
3659                                             mop->size, GACC_STORE);
3660                         break;
3661                 }
3662                 if (copy_from_user(tmpbuf, uaddr, mop->size)) {
3663                         r = -EFAULT;
3664                         break;
3665                 }
3666                 r = write_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size);
3667                 break;
3668         default:
3669                 r = -EINVAL;
3670         }
3671
3672         srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
3673
3674         if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0)
3675                 kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
3676
3677         vfree(tmpbuf);
3678         return r;
3679 }
3680
3681 long kvm_arch_vcpu_ioctl(struct file *filp,
3682                          unsigned int ioctl, unsigned long arg)
3683 {
3684         struct kvm_vcpu *vcpu = filp->private_data;
3685         void __user *argp = (void __user *)arg;
3686         int idx;
3687         long r;
3688
3689         switch (ioctl) {
3690         case KVM_S390_IRQ: {
3691                 struct kvm_s390_irq s390irq;
3692
3693                 r = -EFAULT;
3694                 if (copy_from_user(&s390irq, argp, sizeof(s390irq)))
3695                         break;
3696                 r = kvm_s390_inject_vcpu(vcpu, &s390irq);
3697                 break;
3698         }
3699         case KVM_S390_INTERRUPT: {
3700                 struct kvm_s390_interrupt s390int;
3701                 struct kvm_s390_irq s390irq;
3702
3703                 r = -EFAULT;
3704                 if (copy_from_user(&s390int, argp, sizeof(s390int)))
3705                         break;
3706                 if (s390int_to_s390irq(&s390int, &s390irq))
3707                         return -EINVAL;
3708                 r = kvm_s390_inject_vcpu(vcpu, &s390irq);
3709                 break;
3710         }
3711         case KVM_S390_STORE_STATUS:
3712                 idx = srcu_read_lock(&vcpu->kvm->srcu);
3713                 r = kvm_s390_vcpu_store_status(vcpu, arg);
3714                 srcu_read_unlock(&vcpu->kvm->srcu, idx);
3715                 break;
3716         case KVM_S390_SET_INITIAL_PSW: {
3717                 psw_t psw;
3718
3719                 r = -EFAULT;
3720                 if (copy_from_user(&psw, argp, sizeof(psw)))
3721                         break;
3722                 r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
3723                 break;
3724         }
3725         case KVM_S390_INITIAL_RESET:
3726                 r = kvm_arch_vcpu_ioctl_initial_reset(vcpu);
3727                 break;
3728         case KVM_SET_ONE_REG:
3729         case KVM_GET_ONE_REG: {
3730                 struct kvm_one_reg reg;
3731                 r = -EFAULT;
3732                 if (copy_from_user(&reg, argp, sizeof(reg)))
3733                         break;
3734                 if (ioctl == KVM_SET_ONE_REG)
3735                         r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, &reg);
3736                 else
3737                         r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, &reg);
3738                 break;
3739         }
3740 #ifdef CONFIG_KVM_S390_UCONTROL
3741         case KVM_S390_UCAS_MAP: {
3742                 struct kvm_s390_ucas_mapping ucasmap;
3743
3744                 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
3745                         r = -EFAULT;
3746                         break;
3747                 }
3748
3749                 if (!kvm_is_ucontrol(vcpu->kvm)) {
3750                         r = -EINVAL;
3751                         break;
3752                 }
3753
3754                 r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr,
3755                                      ucasmap.vcpu_addr, ucasmap.length);
3756                 break;
3757         }
3758         case KVM_S390_UCAS_UNMAP: {
3759                 struct kvm_s390_ucas_mapping ucasmap;
3760
3761                 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
3762                         r = -EFAULT;
3763                         break;
3764                 }
3765
3766                 if (!kvm_is_ucontrol(vcpu->kvm)) {
3767                         r = -EINVAL;
3768                         break;
3769                 }
3770
3771                 r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr,
3772                         ucasmap.length);
3773                 break;
3774         }
3775 #endif
3776         case KVM_S390_VCPU_FAULT: {
3777                 r = gmap_fault(vcpu->arch.gmap, arg, 0);
3778                 break;
3779         }
3780         case KVM_ENABLE_CAP:
3781         {
3782                 struct kvm_enable_cap cap;
3783                 r = -EFAULT;
3784                 if (copy_from_user(&cap, argp, sizeof(cap)))
3785                         break;
3786                 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
3787                 break;
3788         }
3789         case KVM_S390_MEM_OP: {
3790                 struct kvm_s390_mem_op mem_op;
3791
3792                 if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0)
3793                         r = kvm_s390_guest_mem_op(vcpu, &mem_op);
3794                 else
3795                         r = -EFAULT;
3796                 break;
3797         }
3798         case KVM_S390_SET_IRQ_STATE: {
3799                 struct kvm_s390_irq_state irq_state;
3800
3801                 r = -EFAULT;
3802                 if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
3803                         break;
3804                 if (irq_state.len > VCPU_IRQS_MAX_BUF ||
3805                     irq_state.len == 0 ||
3806                     irq_state.len % sizeof(struct kvm_s390_irq) > 0) {
3807                         r = -EINVAL;
3808                         break;
3809                 }
3810                 r = kvm_s390_set_irq_state(vcpu,
3811                                            (void __user *) irq_state.buf,
3812                                            irq_state.len);
3813                 break;
3814         }
3815         case KVM_S390_GET_IRQ_STATE: {
3816                 struct kvm_s390_irq_state irq_state;
3817
3818                 r = -EFAULT;
3819                 if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
3820                         break;
3821                 if (irq_state.len == 0) {
3822                         r = -EINVAL;
3823                         break;
3824                 }
3825                 r = kvm_s390_get_irq_state(vcpu,
3826                                            (__u8 __user *)  irq_state.buf,
3827                                            irq_state.len);
3828                 break;
3829         }
3830         default:
3831                 r = -ENOTTY;
3832         }
3833         return r;
3834 }
3835
3836 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
3837 {
3838 #ifdef CONFIG_KVM_S390_UCONTROL
3839         if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET)
3840                  && (kvm_is_ucontrol(vcpu->kvm))) {
3841                 vmf->page = virt_to_page(vcpu->arch.sie_block);
3842                 get_page(vmf->page);
3843                 return 0;
3844         }
3845 #endif
3846         return VM_FAULT_SIGBUS;
3847 }
3848
3849 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
3850                             unsigned long npages)
3851 {
3852         return 0;
3853 }
3854
3855 /* Section: memory related */
3856 int kvm_arch_prepare_memory_region(struct kvm *kvm,
3857                                    struct kvm_memory_slot *memslot,
3858                                    const struct kvm_userspace_memory_region *mem,
3859                                    enum kvm_mr_change change)
3860 {
3861         /* A few sanity checks. We can have memory slots which have to be
3862            located/ended at a segment boundary (1MB). The memory in userland is
3863            ok to be fragmented into various different vmas. It is okay to mmap()
3864            and munmap() stuff in this slot after doing this call at any time */
3865
3866         if (mem->userspace_addr & 0xffffful)
3867                 return -EINVAL;
3868
3869         if (mem->memory_size & 0xffffful)
3870                 return -EINVAL;
3871
3872         if (mem->guest_phys_addr + mem->memory_size > kvm->arch.mem_limit)
3873                 return -EINVAL;
3874
3875         return 0;
3876 }
3877
3878 void kvm_arch_commit_memory_region(struct kvm *kvm,
3879                                 const struct kvm_userspace_memory_region *mem,
3880                                 const struct kvm_memory_slot *old,
3881                                 const struct kvm_memory_slot *new,
3882                                 enum kvm_mr_change change)
3883 {
3884         int rc;
3885
3886         /* If the basics of the memslot do not change, we do not want
3887          * to update the gmap. Every update causes several unnecessary
3888          * segment translation exceptions. This is usually handled just
3889          * fine by the normal fault handler + gmap, but it will also
3890          * cause faults on the prefix page of running guest CPUs.
3891          */
3892         if (old->userspace_addr == mem->userspace_addr &&
3893             old->base_gfn * PAGE_SIZE == mem->guest_phys_addr &&
3894             old->npages * PAGE_SIZE == mem->memory_size)
3895                 return;
3896
3897         rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr,
3898                 mem->guest_phys_addr, mem->memory_size);
3899         if (rc)
3900                 pr_warn("failed to commit memory region\n");
3901         return;
3902 }
3903
3904 static inline unsigned long nonhyp_mask(int i)
3905 {
3906         unsigned int nonhyp_fai = (sclp.hmfai << i * 2) >> 30;
3907
3908         return 0x0000ffffffffffffUL >> (nonhyp_fai << 4);
3909 }
3910
3911 void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu)
3912 {
3913         vcpu->valid_wakeup = false;
3914 }
3915
3916 static int __init kvm_s390_init(void)
3917 {
3918         int i;
3919
3920         if (!sclp.has_sief2) {
3921                 pr_info("SIE not available\n");
3922                 return -ENODEV;
3923         }
3924
3925         for (i = 0; i < 16; i++)
3926                 kvm_s390_fac_list_mask[i] |=
3927                         S390_lowcore.stfle_fac_list[i] & nonhyp_mask(i);
3928
3929         return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
3930 }
3931
3932 static void __exit kvm_s390_exit(void)
3933 {
3934         kvm_exit();
3935 }
3936
3937 module_init(kvm_s390_init);
3938 module_exit(kvm_s390_exit);
3939
3940 /*
3941  * Enable autoloading of the kvm module.
3942  * Note that we add the module alias here instead of virt/kvm/kvm_main.c
3943  * since x86 takes a different approach.
3944  */
3945 #include <linux/miscdevice.h>
3946 MODULE_ALIAS_MISCDEV(KVM_MINOR);
3947 MODULE_ALIAS("devname:kvm");