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         set_kvm_facility(kvm->arch.model.fac_mask, 74);
1931         set_kvm_facility(kvm->arch.model.fac_list, 74);
1932         if (MACHINE_HAS_TLB_GUEST) {
1933                 set_kvm_facility(kvm->arch.model.fac_mask, 147);
1934                 set_kvm_facility(kvm->arch.model.fac_list, 147);
1935         }
1936
1937         kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid();
1938         kvm->arch.model.ibc = sclp.ibc & 0x0fff;
1939
1940         kvm_s390_crypto_init(kvm);
1941
1942         mutex_init(&kvm->arch.float_int.ais_lock);
1943         kvm->arch.float_int.simm = 0;
1944         kvm->arch.float_int.nimm = 0;
1945         spin_lock_init(&kvm->arch.float_int.lock);
1946         for (i = 0; i < FIRQ_LIST_COUNT; i++)
1947                 INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]);
1948         init_waitqueue_head(&kvm->arch.ipte_wq);
1949         mutex_init(&kvm->arch.ipte_mutex);
1950
1951         debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
1952         VM_EVENT(kvm, 3, "vm created with type %lu", type);
1953
1954         if (type & KVM_VM_S390_UCONTROL) {
1955                 kvm->arch.gmap = NULL;
1956                 kvm->arch.mem_limit = KVM_S390_NO_MEM_LIMIT;
1957         } else {
1958                 if (sclp.hamax == U64_MAX)
1959                         kvm->arch.mem_limit = TASK_SIZE_MAX;
1960                 else
1961                         kvm->arch.mem_limit = min_t(unsigned long, TASK_SIZE_MAX,
1962                                                     sclp.hamax + 1);
1963                 kvm->arch.gmap = gmap_create(current->mm, kvm->arch.mem_limit - 1);
1964                 if (!kvm->arch.gmap)
1965                         goto out_err;
1966                 kvm->arch.gmap->private = kvm;
1967                 kvm->arch.gmap->pfault_enabled = 0;
1968         }
1969
1970         kvm->arch.css_support = 0;
1971         kvm->arch.use_irqchip = 0;
1972         kvm->arch.epoch = 0;
1973
1974         spin_lock_init(&kvm->arch.start_stop_lock);
1975         kvm_s390_vsie_init(kvm);
1976         KVM_EVENT(3, "vm 0x%pK created by pid %u", kvm, current->pid);
1977
1978         return 0;
1979 out_err:
1980         free_page((unsigned long)kvm->arch.sie_page2);
1981         debug_unregister(kvm->arch.dbf);
1982         sca_dispose(kvm);
1983         KVM_EVENT(3, "creation of vm failed: %d", rc);
1984         return rc;
1985 }
1986
1987 bool kvm_arch_has_vcpu_debugfs(void)
1988 {
1989         return false;
1990 }
1991
1992 int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
1993 {
1994         return 0;
1995 }
1996
1997 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
1998 {
1999         VCPU_EVENT(vcpu, 3, "%s", "free cpu");
2000         trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
2001         kvm_s390_clear_local_irqs(vcpu);
2002         kvm_clear_async_pf_completion_queue(vcpu);
2003         if (!kvm_is_ucontrol(vcpu->kvm))
2004                 sca_del_vcpu(vcpu);
2005
2006         if (kvm_is_ucontrol(vcpu->kvm))
2007                 gmap_remove(vcpu->arch.gmap);
2008
2009         if (vcpu->kvm->arch.use_cmma)
2010                 kvm_s390_vcpu_unsetup_cmma(vcpu);
2011         free_page((unsigned long)(vcpu->arch.sie_block));
2012
2013         kvm_vcpu_uninit(vcpu);
2014         kmem_cache_free(kvm_vcpu_cache, vcpu);
2015 }
2016
2017 static void kvm_free_vcpus(struct kvm *kvm)
2018 {
2019         unsigned int i;
2020         struct kvm_vcpu *vcpu;
2021
2022         kvm_for_each_vcpu(i, vcpu, kvm)
2023                 kvm_arch_vcpu_destroy(vcpu);
2024
2025         mutex_lock(&kvm->lock);
2026         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
2027                 kvm->vcpus[i] = NULL;
2028
2029         atomic_set(&kvm->online_vcpus, 0);
2030         mutex_unlock(&kvm->lock);
2031 }
2032
2033 void kvm_arch_destroy_vm(struct kvm *kvm)
2034 {
2035         kvm_free_vcpus(kvm);
2036         sca_dispose(kvm);
2037         debug_unregister(kvm->arch.dbf);
2038         free_page((unsigned long)kvm->arch.sie_page2);
2039         if (!kvm_is_ucontrol(kvm))
2040                 gmap_remove(kvm->arch.gmap);
2041         kvm_s390_destroy_adapters(kvm);
2042         kvm_s390_clear_float_irqs(kvm);
2043         kvm_s390_vsie_destroy(kvm);
2044         if (kvm->arch.migration_state) {
2045                 vfree(kvm->arch.migration_state->pgste_bitmap);
2046                 kfree(kvm->arch.migration_state);
2047         }
2048         KVM_EVENT(3, "vm 0x%pK destroyed", kvm);
2049 }
2050
2051 /* Section: vcpu related */
2052 static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu)
2053 {
2054         vcpu->arch.gmap = gmap_create(current->mm, -1UL);
2055         if (!vcpu->arch.gmap)
2056                 return -ENOMEM;
2057         vcpu->arch.gmap->private = vcpu->kvm;
2058
2059         return 0;
2060 }
2061
2062 static void sca_del_vcpu(struct kvm_vcpu *vcpu)
2063 {
2064         if (!kvm_s390_use_sca_entries())
2065                 return;
2066         read_lock(&vcpu->kvm->arch.sca_lock);
2067         if (vcpu->kvm->arch.use_esca) {
2068                 struct esca_block *sca = vcpu->kvm->arch.sca;
2069
2070                 clear_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
2071                 sca->cpu[vcpu->vcpu_id].sda = 0;
2072         } else {
2073                 struct bsca_block *sca = vcpu->kvm->arch.sca;
2074
2075                 clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
2076                 sca->cpu[vcpu->vcpu_id].sda = 0;
2077         }
2078         read_unlock(&vcpu->kvm->arch.sca_lock);
2079 }
2080
2081 static void sca_add_vcpu(struct kvm_vcpu *vcpu)
2082 {
2083         if (!kvm_s390_use_sca_entries()) {
2084                 struct bsca_block *sca = vcpu->kvm->arch.sca;
2085
2086                 /* we still need the basic sca for the ipte control */
2087                 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
2088                 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
2089         }
2090         read_lock(&vcpu->kvm->arch.sca_lock);
2091         if (vcpu->kvm->arch.use_esca) {
2092                 struct esca_block *sca = vcpu->kvm->arch.sca;
2093
2094                 sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
2095                 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
2096                 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca & ~0x3fU;
2097                 vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
2098                 set_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
2099         } else {
2100                 struct bsca_block *sca = vcpu->kvm->arch.sca;
2101
2102                 sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
2103                 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
2104                 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
2105                 set_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
2106         }
2107         read_unlock(&vcpu->kvm->arch.sca_lock);
2108 }
2109
2110 /* Basic SCA to Extended SCA data copy routines */
2111 static inline void sca_copy_entry(struct esca_entry *d, struct bsca_entry *s)
2112 {
2113         d->sda = s->sda;
2114         d->sigp_ctrl.c = s->sigp_ctrl.c;
2115         d->sigp_ctrl.scn = s->sigp_ctrl.scn;
2116 }
2117
2118 static void sca_copy_b_to_e(struct esca_block *d, struct bsca_block *s)
2119 {
2120         int i;
2121
2122         d->ipte_control = s->ipte_control;
2123         d->mcn[0] = s->mcn;
2124         for (i = 0; i < KVM_S390_BSCA_CPU_SLOTS; i++)
2125                 sca_copy_entry(&d->cpu[i], &s->cpu[i]);
2126 }
2127
2128 static int sca_switch_to_extended(struct kvm *kvm)
2129 {
2130         struct bsca_block *old_sca = kvm->arch.sca;
2131         struct esca_block *new_sca;
2132         struct kvm_vcpu *vcpu;
2133         unsigned int vcpu_idx;
2134         u32 scaol, scaoh;
2135
2136         new_sca = alloc_pages_exact(sizeof(*new_sca), GFP_KERNEL|__GFP_ZERO);
2137         if (!new_sca)
2138                 return -ENOMEM;
2139
2140         scaoh = (u32)((u64)(new_sca) >> 32);
2141         scaol = (u32)(u64)(new_sca) & ~0x3fU;
2142
2143         kvm_s390_vcpu_block_all(kvm);
2144         write_lock(&kvm->arch.sca_lock);
2145
2146         sca_copy_b_to_e(new_sca, old_sca);
2147
2148         kvm_for_each_vcpu(vcpu_idx, vcpu, kvm) {
2149                 vcpu->arch.sie_block->scaoh = scaoh;
2150                 vcpu->arch.sie_block->scaol = scaol;
2151                 vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
2152         }
2153         kvm->arch.sca = new_sca;
2154         kvm->arch.use_esca = 1;
2155
2156         write_unlock(&kvm->arch.sca_lock);
2157         kvm_s390_vcpu_unblock_all(kvm);
2158
2159         free_page((unsigned long)old_sca);
2160
2161         VM_EVENT(kvm, 2, "Switched to ESCA (0x%pK -> 0x%pK)",
2162                  old_sca, kvm->arch.sca);
2163         return 0;
2164 }
2165
2166 static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)
2167 {
2168         int rc;
2169
2170         if (!kvm_s390_use_sca_entries()) {
2171                 if (id < KVM_MAX_VCPUS)
2172                         return true;
2173                 return false;
2174         }
2175         if (id < KVM_S390_BSCA_CPU_SLOTS)
2176                 return true;
2177         if (!sclp.has_esca || !sclp.has_64bscao)
2178                 return false;
2179
2180         mutex_lock(&kvm->lock);
2181         rc = kvm->arch.use_esca ? 0 : sca_switch_to_extended(kvm);
2182         mutex_unlock(&kvm->lock);
2183
2184         return rc == 0 && id < KVM_S390_ESCA_CPU_SLOTS;
2185 }
2186
2187 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
2188 {
2189         vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
2190         kvm_clear_async_pf_completion_queue(vcpu);
2191         vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
2192                                     KVM_SYNC_GPRS |
2193                                     KVM_SYNC_ACRS |
2194                                     KVM_SYNC_CRS |
2195                                     KVM_SYNC_ARCH0 |
2196                                     KVM_SYNC_PFAULT;
2197         kvm_s390_set_prefix(vcpu, 0);
2198         if (test_kvm_facility(vcpu->kvm, 64))
2199                 vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;
2200         if (test_kvm_facility(vcpu->kvm, 133))
2201                 vcpu->run->kvm_valid_regs |= KVM_SYNC_GSCB;
2202         /* fprs can be synchronized via vrs, even if the guest has no vx. With
2203          * MACHINE_HAS_VX, (load|store)_fpu_regs() will work with vrs format.
2204          */
2205         if (MACHINE_HAS_VX)
2206                 vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS;
2207         else
2208                 vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS;
2209
2210         if (kvm_is_ucontrol(vcpu->kvm))
2211                 return __kvm_ucontrol_vcpu_init(vcpu);
2212
2213         return 0;
2214 }
2215
2216 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2217 static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2218 {
2219         WARN_ON_ONCE(vcpu->arch.cputm_start != 0);
2220         raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2221         vcpu->arch.cputm_start = get_tod_clock_fast();
2222         raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2223 }
2224
2225 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2226 static void __stop_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2227 {
2228         WARN_ON_ONCE(vcpu->arch.cputm_start == 0);
2229         raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2230         vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start;
2231         vcpu->arch.cputm_start = 0;
2232         raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2233 }
2234
2235 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2236 static void __enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2237 {
2238         WARN_ON_ONCE(vcpu->arch.cputm_enabled);
2239         vcpu->arch.cputm_enabled = true;
2240         __start_cpu_timer_accounting(vcpu);
2241 }
2242
2243 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2244 static void __disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2245 {
2246         WARN_ON_ONCE(!vcpu->arch.cputm_enabled);
2247         __stop_cpu_timer_accounting(vcpu);
2248         vcpu->arch.cputm_enabled = false;
2249 }
2250
2251 static void enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2252 {
2253         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2254         __enable_cpu_timer_accounting(vcpu);
2255         preempt_enable();
2256 }
2257
2258 static void disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2259 {
2260         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2261         __disable_cpu_timer_accounting(vcpu);
2262         preempt_enable();
2263 }
2264
2265 /* set the cpu timer - may only be called from the VCPU thread itself */
2266 void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm)
2267 {
2268         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2269         raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2270         if (vcpu->arch.cputm_enabled)
2271                 vcpu->arch.cputm_start = get_tod_clock_fast();
2272         vcpu->arch.sie_block->cputm = cputm;
2273         raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2274         preempt_enable();
2275 }
2276
2277 /* update and get the cpu timer - can also be called from other VCPU threads */
2278 __u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu)
2279 {
2280         unsigned int seq;
2281         __u64 value;
2282
2283         if (unlikely(!vcpu->arch.cputm_enabled))
2284                 return vcpu->arch.sie_block->cputm;
2285
2286         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2287         do {
2288                 seq = raw_read_seqcount(&vcpu->arch.cputm_seqcount);
2289                 /*
2290                  * If the writer would ever execute a read in the critical
2291                  * section, e.g. in irq context, we have a deadlock.
2292                  */
2293                 WARN_ON_ONCE((seq & 1) && smp_processor_id() == vcpu->cpu);
2294                 value = vcpu->arch.sie_block->cputm;
2295                 /* if cputm_start is 0, accounting is being started/stopped */
2296                 if (likely(vcpu->arch.cputm_start))
2297                         value -= get_tod_clock_fast() - vcpu->arch.cputm_start;
2298         } while (read_seqcount_retry(&vcpu->arch.cputm_seqcount, seq & ~1));
2299         preempt_enable();
2300         return value;
2301 }
2302
2303 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
2304 {
2305
2306         gmap_enable(vcpu->arch.enabled_gmap);
2307         atomic_or(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
2308         if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
2309                 __start_cpu_timer_accounting(vcpu);
2310         vcpu->cpu = cpu;
2311 }
2312
2313 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
2314 {
2315         vcpu->cpu = -1;
2316         if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
2317                 __stop_cpu_timer_accounting(vcpu);
2318         atomic_andnot(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
2319         vcpu->arch.enabled_gmap = gmap_get_enabled();
2320         gmap_disable(vcpu->arch.enabled_gmap);
2321
2322 }
2323
2324 static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
2325 {
2326         /* this equals initial cpu reset in pop, but we don't switch to ESA */
2327         vcpu->arch.sie_block->gpsw.mask = 0UL;
2328         vcpu->arch.sie_block->gpsw.addr = 0UL;
2329         kvm_s390_set_prefix(vcpu, 0);
2330         kvm_s390_set_cpu_timer(vcpu, 0);
2331         vcpu->arch.sie_block->ckc       = 0UL;
2332         vcpu->arch.sie_block->todpr     = 0;
2333         memset(vcpu->arch.sie_block->gcr, 0, 16 * sizeof(__u64));
2334         vcpu->arch.sie_block->gcr[0]  = 0xE0UL;
2335         vcpu->arch.sie_block->gcr[14] = 0xC2000000UL;
2336         /* make sure the new fpc will be lazily loaded */
2337         save_fpu_regs();
2338         current->thread.fpu.fpc = 0;
2339         vcpu->arch.sie_block->gbea = 1;
2340         vcpu->arch.sie_block->pp = 0;
2341         vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
2342         kvm_clear_async_pf_completion_queue(vcpu);
2343         if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
2344                 kvm_s390_vcpu_stop(vcpu);
2345         kvm_s390_clear_local_irqs(vcpu);
2346 }
2347
2348 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
2349 {
2350         mutex_lock(&vcpu->kvm->lock);
2351         preempt_disable();
2352         vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch;
2353         preempt_enable();
2354         mutex_unlock(&vcpu->kvm->lock);
2355         if (!kvm_is_ucontrol(vcpu->kvm)) {
2356                 vcpu->arch.gmap = vcpu->kvm->arch.gmap;
2357                 sca_add_vcpu(vcpu);
2358         }
2359         if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0)
2360                 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
2361         /* make vcpu_load load the right gmap on the first trigger */
2362         vcpu->arch.enabled_gmap = vcpu->arch.gmap;
2363 }
2364
2365 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
2366 {
2367         if (!test_kvm_facility(vcpu->kvm, 76))
2368                 return;
2369
2370         vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA);
2371
2372         if (vcpu->kvm->arch.crypto.aes_kw)
2373                 vcpu->arch.sie_block->ecb3 |= ECB3_AES;
2374         if (vcpu->kvm->arch.crypto.dea_kw)
2375                 vcpu->arch.sie_block->ecb3 |= ECB3_DEA;
2376
2377         vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd;
2378 }
2379
2380 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu)
2381 {
2382         free_page(vcpu->arch.sie_block->cbrlo);
2383         vcpu->arch.sie_block->cbrlo = 0;
2384 }
2385
2386 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu)
2387 {
2388         vcpu->arch.sie_block->cbrlo = get_zeroed_page(GFP_KERNEL);
2389         if (!vcpu->arch.sie_block->cbrlo)
2390                 return -ENOMEM;
2391
2392         vcpu->arch.sie_block->ecb2 &= ~ECB2_PFMFI;
2393         return 0;
2394 }
2395
2396 static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu)
2397 {
2398         struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model;
2399
2400         vcpu->arch.sie_block->ibc = model->ibc;
2401         if (test_kvm_facility(vcpu->kvm, 7))
2402                 vcpu->arch.sie_block->fac = (u32)(u64) model->fac_list;
2403 }
2404
2405 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
2406 {
2407         int rc = 0;
2408
2409         atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
2410                                                     CPUSTAT_SM |
2411                                                     CPUSTAT_STOPPED);
2412
2413         if (test_kvm_facility(vcpu->kvm, 78))
2414                 atomic_or(CPUSTAT_GED2, &vcpu->arch.sie_block->cpuflags);
2415         else if (test_kvm_facility(vcpu->kvm, 8))
2416                 atomic_or(CPUSTAT_GED, &vcpu->arch.sie_block->cpuflags);
2417
2418         kvm_s390_vcpu_setup_model(vcpu);
2419
2420         /* pgste_set_pte has special handling for !MACHINE_HAS_ESOP */
2421         if (MACHINE_HAS_ESOP)
2422                 vcpu->arch.sie_block->ecb |= ECB_HOSTPROTINT;
2423         if (test_kvm_facility(vcpu->kvm, 9))
2424                 vcpu->arch.sie_block->ecb |= ECB_SRSI;
2425         if (test_kvm_facility(vcpu->kvm, 73))
2426                 vcpu->arch.sie_block->ecb |= ECB_TE;
2427
2428         if (test_kvm_facility(vcpu->kvm, 8) && sclp.has_pfmfi)
2429                 vcpu->arch.sie_block->ecb2 |= ECB2_PFMFI;
2430         if (test_kvm_facility(vcpu->kvm, 130))
2431                 vcpu->arch.sie_block->ecb2 |= ECB2_IEP;
2432         vcpu->arch.sie_block->eca = ECA_MVPGI | ECA_PROTEXCI;
2433         if (sclp.has_cei)
2434                 vcpu->arch.sie_block->eca |= ECA_CEI;
2435         if (sclp.has_ib)
2436                 vcpu->arch.sie_block->eca |= ECA_IB;
2437         if (sclp.has_siif)
2438                 vcpu->arch.sie_block->eca |= ECA_SII;
2439         if (sclp.has_sigpif)
2440                 vcpu->arch.sie_block->eca |= ECA_SIGPI;
2441         if (test_kvm_facility(vcpu->kvm, 129)) {
2442                 vcpu->arch.sie_block->eca |= ECA_VX;
2443                 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
2444         }
2445         if (test_kvm_facility(vcpu->kvm, 139))
2446                 vcpu->arch.sie_block->ecd |= ECD_MEF;
2447
2448         vcpu->arch.sie_block->sdnxo = ((unsigned long) &vcpu->run->s.regs.sdnx)
2449                                         | SDNXC;
2450         vcpu->arch.sie_block->riccbd = (unsigned long) &vcpu->run->s.regs.riccb;
2451
2452         if (sclp.has_kss)
2453                 atomic_or(CPUSTAT_KSS, &vcpu->arch.sie_block->cpuflags);
2454         else
2455                 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
2456
2457         if (vcpu->kvm->arch.use_cmma) {
2458                 rc = kvm_s390_vcpu_setup_cmma(vcpu);
2459                 if (rc)
2460                         return rc;
2461         }
2462         hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
2463         vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
2464
2465         kvm_s390_vcpu_crypto_setup(vcpu);
2466
2467         return rc;
2468 }
2469
2470 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
2471                                       unsigned int id)
2472 {
2473         struct kvm_vcpu *vcpu;
2474         struct sie_page *sie_page;
2475         int rc = -EINVAL;
2476
2477         if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id))
2478                 goto out;
2479
2480         rc = -ENOMEM;
2481
2482         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
2483         if (!vcpu)
2484                 goto out;
2485
2486         BUILD_BUG_ON(sizeof(struct sie_page) != 4096);
2487         sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL);
2488         if (!sie_page)
2489                 goto out_free_cpu;
2490
2491         vcpu->arch.sie_block = &sie_page->sie_block;
2492         vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb;
2493
2494         /* the real guest size will always be smaller than msl */
2495         vcpu->arch.sie_block->mso = 0;
2496         vcpu->arch.sie_block->msl = sclp.hamax;
2497
2498         vcpu->arch.sie_block->icpua = id;
2499         spin_lock_init(&vcpu->arch.local_int.lock);
2500         vcpu->arch.local_int.float_int = &kvm->arch.float_int;
2501         vcpu->arch.local_int.wq = &vcpu->wq;
2502         vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags;
2503         seqcount_init(&vcpu->arch.cputm_seqcount);
2504
2505         rc = kvm_vcpu_init(vcpu, kvm, id);
2506         if (rc)
2507                 goto out_free_sie_block;
2508         VM_EVENT(kvm, 3, "create cpu %d at 0x%pK, sie block at 0x%pK", id, vcpu,
2509                  vcpu->arch.sie_block);
2510         trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block);
2511
2512         return vcpu;
2513 out_free_sie_block:
2514         free_page((unsigned long)(vcpu->arch.sie_block));
2515 out_free_cpu:
2516         kmem_cache_free(kvm_vcpu_cache, vcpu);
2517 out:
2518         return ERR_PTR(rc);
2519 }
2520
2521 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
2522 {
2523         return kvm_s390_vcpu_has_irq(vcpu, 0);
2524 }
2525
2526 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu)
2527 {
2528         atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
2529         exit_sie(vcpu);
2530 }
2531
2532 void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu)
2533 {
2534         atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
2535 }
2536
2537 static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu)
2538 {
2539         atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
2540         exit_sie(vcpu);
2541 }
2542
2543 static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu)
2544 {
2545         atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
2546 }
2547
2548 /*
2549  * Kick a guest cpu out of SIE and wait until SIE is not running.
2550  * If the CPU is not running (e.g. waiting as idle) the function will
2551  * return immediately. */
2552 void exit_sie(struct kvm_vcpu *vcpu)
2553 {
2554         atomic_or(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags);
2555         while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE)
2556                 cpu_relax();
2557 }
2558
2559 /* Kick a guest cpu out of SIE to process a request synchronously */
2560 void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu)
2561 {
2562         kvm_make_request(req, vcpu);
2563         kvm_s390_vcpu_request(vcpu);
2564 }
2565
2566 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
2567                               unsigned long end)
2568 {
2569         struct kvm *kvm = gmap->private;
2570         struct kvm_vcpu *vcpu;
2571         unsigned long prefix;
2572         int i;
2573
2574         if (gmap_is_shadow(gmap))
2575                 return;
2576         if (start >= 1UL << 31)
2577                 /* We are only interested in prefix pages */
2578                 return;
2579         kvm_for_each_vcpu(i, vcpu, kvm) {
2580                 /* match against both prefix pages */
2581                 prefix = kvm_s390_get_prefix(vcpu);
2582                 if (prefix <= end && start <= prefix + 2*PAGE_SIZE - 1) {
2583                         VCPU_EVENT(vcpu, 2, "gmap notifier for %lx-%lx",
2584                                    start, end);
2585                         kvm_s390_sync_request(KVM_REQ_MMU_RELOAD, vcpu);
2586                 }
2587         }
2588 }
2589
2590 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
2591 {
2592         /* kvm common code refers to this, but never calls it */
2593         BUG();
2594         return 0;
2595 }
2596
2597 static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
2598                                            struct kvm_one_reg *reg)
2599 {
2600         int r = -EINVAL;
2601
2602         switch (reg->id) {
2603         case KVM_REG_S390_TODPR:
2604                 r = put_user(vcpu->arch.sie_block->todpr,
2605                              (u32 __user *)reg->addr);
2606                 break;
2607         case KVM_REG_S390_EPOCHDIFF:
2608                 r = put_user(vcpu->arch.sie_block->epoch,
2609                              (u64 __user *)reg->addr);
2610                 break;
2611         case KVM_REG_S390_CPU_TIMER:
2612                 r = put_user(kvm_s390_get_cpu_timer(vcpu),
2613                              (u64 __user *)reg->addr);
2614                 break;
2615         case KVM_REG_S390_CLOCK_COMP:
2616                 r = put_user(vcpu->arch.sie_block->ckc,
2617                              (u64 __user *)reg->addr);
2618                 break;
2619         case KVM_REG_S390_PFTOKEN:
2620                 r = put_user(vcpu->arch.pfault_token,
2621                              (u64 __user *)reg->addr);
2622                 break;
2623         case KVM_REG_S390_PFCOMPARE:
2624                 r = put_user(vcpu->arch.pfault_compare,
2625                              (u64 __user *)reg->addr);
2626                 break;
2627         case KVM_REG_S390_PFSELECT:
2628                 r = put_user(vcpu->arch.pfault_select,
2629                              (u64 __user *)reg->addr);
2630                 break;
2631         case KVM_REG_S390_PP:
2632                 r = put_user(vcpu->arch.sie_block->pp,
2633                              (u64 __user *)reg->addr);
2634                 break;
2635         case KVM_REG_S390_GBEA:
2636                 r = put_user(vcpu->arch.sie_block->gbea,
2637                              (u64 __user *)reg->addr);
2638                 break;
2639         default:
2640                 break;
2641         }
2642
2643         return r;
2644 }
2645
2646 static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
2647                                            struct kvm_one_reg *reg)
2648 {
2649         int r = -EINVAL;
2650         __u64 val;
2651
2652         switch (reg->id) {
2653         case KVM_REG_S390_TODPR:
2654                 r = get_user(vcpu->arch.sie_block->todpr,
2655                              (u32 __user *)reg->addr);
2656                 break;
2657         case KVM_REG_S390_EPOCHDIFF:
2658                 r = get_user(vcpu->arch.sie_block->epoch,
2659                              (u64 __user *)reg->addr);
2660                 break;
2661         case KVM_REG_S390_CPU_TIMER:
2662                 r = get_user(val, (u64 __user *)reg->addr);
2663                 if (!r)
2664                         kvm_s390_set_cpu_timer(vcpu, val);
2665                 break;
2666         case KVM_REG_S390_CLOCK_COMP:
2667                 r = get_user(vcpu->arch.sie_block->ckc,
2668                              (u64 __user *)reg->addr);
2669                 break;
2670         case KVM_REG_S390_PFTOKEN:
2671                 r = get_user(vcpu->arch.pfault_token,
2672                              (u64 __user *)reg->addr);
2673                 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
2674                         kvm_clear_async_pf_completion_queue(vcpu);
2675                 break;
2676         case KVM_REG_S390_PFCOMPARE:
2677                 r = get_user(vcpu->arch.pfault_compare,
2678                              (u64 __user *)reg->addr);
2679                 break;
2680         case KVM_REG_S390_PFSELECT:
2681                 r = get_user(vcpu->arch.pfault_select,
2682                              (u64 __user *)reg->addr);
2683                 break;
2684         case KVM_REG_S390_PP:
2685                 r = get_user(vcpu->arch.sie_block->pp,
2686                              (u64 __user *)reg->addr);
2687                 break;
2688         case KVM_REG_S390_GBEA:
2689                 r = get_user(vcpu->arch.sie_block->gbea,
2690                              (u64 __user *)reg->addr);
2691                 break;
2692         default:
2693                 break;
2694         }
2695
2696         return r;
2697 }
2698
2699 static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
2700 {
2701         kvm_s390_vcpu_initial_reset(vcpu);
2702         return 0;
2703 }
2704
2705 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
2706 {
2707         memcpy(&vcpu->run->s.regs.gprs, &regs->gprs, sizeof(regs->gprs));
2708         return 0;
2709 }
2710
2711 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
2712 {
2713         memcpy(&regs->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs));
2714         return 0;
2715 }
2716
2717 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2718                                   struct kvm_sregs *sregs)
2719 {
2720         memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs));
2721         memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));
2722         return 0;
2723 }
2724
2725 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
2726                                   struct kvm_sregs *sregs)
2727 {
2728         memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs));
2729         memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs));
2730         return 0;
2731 }
2732
2733 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2734 {
2735         if (test_fp_ctl(fpu->fpc))
2736                 return -EINVAL;
2737         vcpu->run->s.regs.fpc = fpu->fpc;
2738         if (MACHINE_HAS_VX)
2739                 convert_fp_to_vx((__vector128 *) vcpu->run->s.regs.vrs,
2740                                  (freg_t *) fpu->fprs);
2741         else
2742                 memcpy(vcpu->run->s.regs.fprs, &fpu->fprs, sizeof(fpu->fprs));
2743         return 0;
2744 }
2745
2746 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2747 {
2748         /* make sure we have the latest values */
2749         save_fpu_regs();
2750         if (MACHINE_HAS_VX)
2751                 convert_vx_to_fp((freg_t *) fpu->fprs,
2752                                  (__vector128 *) vcpu->run->s.regs.vrs);
2753         else
2754                 memcpy(fpu->fprs, vcpu->run->s.regs.fprs, sizeof(fpu->fprs));
2755         fpu->fpc = vcpu->run->s.regs.fpc;
2756         return 0;
2757 }
2758
2759 static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
2760 {
2761         int rc = 0;
2762
2763         if (!is_vcpu_stopped(vcpu))
2764                 rc = -EBUSY;
2765         else {
2766                 vcpu->run->psw_mask = psw.mask;
2767                 vcpu->run->psw_addr = psw.addr;
2768         }
2769         return rc;
2770 }
2771
2772 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2773                                   struct kvm_translation *tr)
2774 {
2775         return -EINVAL; /* not implemented yet */
2776 }
2777
2778 #define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \
2779                               KVM_GUESTDBG_USE_HW_BP | \
2780                               KVM_GUESTDBG_ENABLE)
2781
2782 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
2783                                         struct kvm_guest_debug *dbg)
2784 {
2785         int rc = 0;
2786
2787         vcpu->guest_debug = 0;
2788         kvm_s390_clear_bp_data(vcpu);
2789
2790         if (dbg->control & ~VALID_GUESTDBG_FLAGS)
2791                 return -EINVAL;
2792         if (!sclp.has_gpere)
2793                 return -EINVAL;
2794
2795         if (dbg->control & KVM_GUESTDBG_ENABLE) {
2796                 vcpu->guest_debug = dbg->control;
2797                 /* enforce guest PER */
2798                 atomic_or(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2799
2800                 if (dbg->control & KVM_GUESTDBG_USE_HW_BP)
2801                         rc = kvm_s390_import_bp_data(vcpu, dbg);
2802         } else {
2803                 atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2804                 vcpu->arch.guestdbg.last_bp = 0;
2805         }
2806
2807         if (rc) {
2808                 vcpu->guest_debug = 0;
2809                 kvm_s390_clear_bp_data(vcpu);
2810                 atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2811         }
2812
2813         return rc;
2814 }
2815
2816 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
2817                                     struct kvm_mp_state *mp_state)
2818 {
2819         /* CHECK_STOP and LOAD are not supported yet */
2820         return is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED :
2821                                        KVM_MP_STATE_OPERATING;
2822 }
2823
2824 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
2825                                     struct kvm_mp_state *mp_state)
2826 {
2827         int rc = 0;
2828
2829         /* user space knows about this interface - let it control the state */
2830         vcpu->kvm->arch.user_cpu_state_ctrl = 1;
2831
2832         switch (mp_state->mp_state) {
2833         case KVM_MP_STATE_STOPPED:
2834                 kvm_s390_vcpu_stop(vcpu);
2835                 break;
2836         case KVM_MP_STATE_OPERATING:
2837                 kvm_s390_vcpu_start(vcpu);
2838                 break;
2839         case KVM_MP_STATE_LOAD:
2840         case KVM_MP_STATE_CHECK_STOP:
2841                 /* fall through - CHECK_STOP and LOAD are not supported yet */
2842         default:
2843                 rc = -ENXIO;
2844         }
2845
2846         return rc;
2847 }
2848
2849 static bool ibs_enabled(struct kvm_vcpu *vcpu)
2850 {
2851         return atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_IBS;
2852 }
2853
2854 static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
2855 {
2856 retry:
2857         kvm_s390_vcpu_request_handled(vcpu);
2858         if (!kvm_request_pending(vcpu))
2859                 return 0;
2860         /*
2861          * We use MMU_RELOAD just to re-arm the ipte notifier for the
2862          * guest prefix page. gmap_mprotect_notify will wait on the ptl lock.
2863          * This ensures that the ipte instruction for this request has
2864          * already finished. We might race against a second unmapper that
2865          * wants to set the blocking bit. Lets just retry the request loop.
2866          */
2867         if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) {
2868                 int rc;
2869                 rc = gmap_mprotect_notify(vcpu->arch.gmap,
2870                                           kvm_s390_get_prefix(vcpu),
2871                                           PAGE_SIZE * 2, PROT_WRITE);
2872                 if (rc) {
2873                         kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
2874                         return rc;
2875                 }
2876                 goto retry;
2877         }
2878
2879         if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
2880                 vcpu->arch.sie_block->ihcpu = 0xffff;
2881                 goto retry;
2882         }
2883
2884         if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) {
2885                 if (!ibs_enabled(vcpu)) {
2886                         trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1);
2887                         atomic_or(CPUSTAT_IBS,
2888                                         &vcpu->arch.sie_block->cpuflags);
2889                 }
2890                 goto retry;
2891         }
2892
2893         if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) {
2894                 if (ibs_enabled(vcpu)) {
2895                         trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0);
2896                         atomic_andnot(CPUSTAT_IBS,
2897                                           &vcpu->arch.sie_block->cpuflags);
2898                 }
2899                 goto retry;
2900         }
2901
2902         if (kvm_check_request(KVM_REQ_ICPT_OPEREXC, vcpu)) {
2903                 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
2904                 goto retry;
2905         }
2906
2907         if (kvm_check_request(KVM_REQ_START_MIGRATION, vcpu)) {
2908                 /*
2909                  * Disable CMMA virtualization; we will emulate the ESSA
2910                  * instruction manually, in order to provide additional
2911                  * functionalities needed for live migration.
2912                  */
2913                 vcpu->arch.sie_block->ecb2 &= ~ECB2_CMMA;
2914                 goto retry;
2915         }
2916
2917         if (kvm_check_request(KVM_REQ_STOP_MIGRATION, vcpu)) {
2918                 /*
2919                  * Re-enable CMMA virtualization if CMMA is available and
2920                  * was used.
2921                  */
2922                 if ((vcpu->kvm->arch.use_cmma) &&
2923                     (vcpu->kvm->mm->context.use_cmma))
2924                         vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
2925                 goto retry;
2926         }
2927
2928         /* nothing to do, just clear the request */
2929         kvm_clear_request(KVM_REQ_UNHALT, vcpu);
2930
2931         return 0;
2932 }
2933
2934 void kvm_s390_set_tod_clock_ext(struct kvm *kvm,
2935                                  const struct kvm_s390_vm_tod_clock *gtod)
2936 {
2937         struct kvm_vcpu *vcpu;
2938         struct kvm_s390_tod_clock_ext htod;
2939         int i;
2940
2941         mutex_lock(&kvm->lock);
2942         preempt_disable();
2943
2944         get_tod_clock_ext((char *)&htod);
2945
2946         kvm->arch.epoch = gtod->tod - htod.tod;
2947         kvm->arch.epdx = gtod->epoch_idx - htod.epoch_idx;
2948
2949         if (kvm->arch.epoch > gtod->tod)
2950                 kvm->arch.epdx -= 1;
2951
2952         kvm_s390_vcpu_block_all(kvm);
2953         kvm_for_each_vcpu(i, vcpu, kvm) {
2954                 vcpu->arch.sie_block->epoch = kvm->arch.epoch;
2955                 vcpu->arch.sie_block->epdx  = kvm->arch.epdx;
2956         }
2957
2958         kvm_s390_vcpu_unblock_all(kvm);
2959         preempt_enable();
2960         mutex_unlock(&kvm->lock);
2961 }
2962
2963 void kvm_s390_set_tod_clock(struct kvm *kvm, u64 tod)
2964 {
2965         struct kvm_vcpu *vcpu;
2966         int i;
2967
2968         mutex_lock(&kvm->lock);
2969         preempt_disable();
2970         kvm->arch.epoch = tod - get_tod_clock();
2971         kvm_s390_vcpu_block_all(kvm);
2972         kvm_for_each_vcpu(i, vcpu, kvm)
2973                 vcpu->arch.sie_block->epoch = kvm->arch.epoch;
2974         kvm_s390_vcpu_unblock_all(kvm);
2975         preempt_enable();
2976         mutex_unlock(&kvm->lock);
2977 }
2978
2979 /**
2980  * kvm_arch_fault_in_page - fault-in guest page if necessary
2981  * @vcpu: The corresponding virtual cpu
2982  * @gpa: Guest physical address
2983  * @writable: Whether the page should be writable or not
2984  *
2985  * Make sure that a guest page has been faulted-in on the host.
2986  *
2987  * Return: Zero on success, negative error code otherwise.
2988  */
2989 long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable)
2990 {
2991         return gmap_fault(vcpu->arch.gmap, gpa,
2992                           writable ? FAULT_FLAG_WRITE : 0);
2993 }
2994
2995 static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token,
2996                                       unsigned long token)
2997 {
2998         struct kvm_s390_interrupt inti;
2999         struct kvm_s390_irq irq;
3000
3001         if (start_token) {
3002                 irq.u.ext.ext_params2 = token;
3003                 irq.type = KVM_S390_INT_PFAULT_INIT;
3004                 WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq));
3005         } else {
3006                 inti.type = KVM_S390_INT_PFAULT_DONE;
3007                 inti.parm64 = token;
3008                 WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti));
3009         }
3010 }
3011
3012 void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
3013                                      struct kvm_async_pf *work)
3014 {
3015         trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token);
3016         __kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token);
3017 }
3018
3019 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
3020                                  struct kvm_async_pf *work)
3021 {
3022         trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token);
3023         __kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token);
3024 }
3025
3026 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu,
3027                                struct kvm_async_pf *work)
3028 {
3029         /* s390 will always inject the page directly */
3030 }
3031
3032 bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu)
3033 {
3034         /*
3035          * s390 will always inject the page directly,
3036          * but we still want check_async_completion to cleanup
3037          */
3038         return true;
3039 }
3040
3041 static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu)
3042 {
3043         hva_t hva;
3044         struct kvm_arch_async_pf arch;
3045         int rc;
3046
3047         if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
3048                 return 0;
3049         if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) !=
3050             vcpu->arch.pfault_compare)
3051                 return 0;
3052         if (psw_extint_disabled(vcpu))
3053                 return 0;
3054         if (kvm_s390_vcpu_has_irq(vcpu, 0))
3055                 return 0;
3056         if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
3057                 return 0;
3058         if (!vcpu->arch.gmap->pfault_enabled)
3059                 return 0;
3060
3061         hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr));
3062         hva += current->thread.gmap_addr & ~PAGE_MASK;
3063         if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8))
3064                 return 0;
3065
3066         rc = kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch);
3067         return rc;
3068 }
3069
3070 static int vcpu_pre_run(struct kvm_vcpu *vcpu)
3071 {
3072         int rc, cpuflags;
3073
3074         /*
3075          * On s390 notifications for arriving pages will be delivered directly
3076          * to the guest but the house keeping for completed pfaults is
3077          * handled outside the worker.
3078          */
3079         kvm_check_async_pf_completion(vcpu);
3080
3081         vcpu->arch.sie_block->gg14 = vcpu->run->s.regs.gprs[14];
3082         vcpu->arch.sie_block->gg15 = vcpu->run->s.regs.gprs[15];
3083
3084         if (need_resched())
3085                 schedule();
3086
3087         if (test_cpu_flag(CIF_MCCK_PENDING))
3088                 s390_handle_mcck();
3089
3090         if (!kvm_is_ucontrol(vcpu->kvm)) {
3091                 rc = kvm_s390_deliver_pending_interrupts(vcpu);
3092                 if (rc)
3093                         return rc;
3094         }
3095
3096         rc = kvm_s390_handle_requests(vcpu);
3097         if (rc)
3098                 return rc;
3099
3100         if (guestdbg_enabled(vcpu)) {
3101                 kvm_s390_backup_guest_per_regs(vcpu);
3102                 kvm_s390_patch_guest_per_regs(vcpu);
3103         }
3104
3105         vcpu->arch.sie_block->icptcode = 0;
3106         cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags);
3107         VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags);
3108         trace_kvm_s390_sie_enter(vcpu, cpuflags);
3109
3110         return 0;
3111 }
3112
3113 static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu)
3114 {
3115         struct kvm_s390_pgm_info pgm_info = {
3116                 .code = PGM_ADDRESSING,
3117         };
3118         u8 opcode, ilen;
3119         int rc;
3120
3121         VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction");
3122         trace_kvm_s390_sie_fault(vcpu);
3123
3124         /*
3125          * We want to inject an addressing exception, which is defined as a
3126          * suppressing or terminating exception. However, since we came here
3127          * by a DAT access exception, the PSW still points to the faulting
3128          * instruction since DAT exceptions are nullifying. So we've got
3129          * to look up the current opcode to get the length of the instruction
3130          * to be able to forward the PSW.
3131          */
3132         rc = read_guest_instr(vcpu, vcpu->arch.sie_block->gpsw.addr, &opcode, 1);
3133         ilen = insn_length(opcode);
3134         if (rc < 0) {
3135                 return rc;
3136         } else if (rc) {
3137                 /* Instruction-Fetching Exceptions - we can't detect the ilen.
3138                  * Forward by arbitrary ilc, injection will take care of
3139                  * nullification if necessary.
3140                  */
3141                 pgm_info = vcpu->arch.pgm;
3142                 ilen = 4;
3143         }
3144         pgm_info.flags = ilen | KVM_S390_PGM_FLAGS_ILC_VALID;
3145         kvm_s390_forward_psw(vcpu, ilen);
3146         return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
3147 }
3148
3149 static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason)
3150 {
3151         struct mcck_volatile_info *mcck_info;
3152         struct sie_page *sie_page;
3153
3154         VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
3155                    vcpu->arch.sie_block->icptcode);
3156         trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);
3157
3158         if (guestdbg_enabled(vcpu))
3159                 kvm_s390_restore_guest_per_regs(vcpu);
3160
3161         vcpu->run->s.regs.gprs[14] = vcpu->arch.sie_block->gg14;
3162         vcpu->run->s.regs.gprs[15] = vcpu->arch.sie_block->gg15;
3163
3164         if (exit_reason == -EINTR) {
3165                 VCPU_EVENT(vcpu, 3, "%s", "machine check");
3166                 sie_page = container_of(vcpu->arch.sie_block,
3167                                         struct sie_page, sie_block);
3168                 mcck_info = &sie_page->mcck_info;
3169                 kvm_s390_reinject_machine_check(vcpu, mcck_info);
3170                 return 0;
3171         }
3172
3173         if (vcpu->arch.sie_block->icptcode > 0) {
3174                 int rc = kvm_handle_sie_intercept(vcpu);
3175
3176                 if (rc != -EOPNOTSUPP)
3177                         return rc;
3178                 vcpu->run->exit_reason = KVM_EXIT_S390_SIEIC;
3179                 vcpu->run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode;
3180                 vcpu->run->s390_sieic.ipa = vcpu->arch.sie_block->ipa;
3181                 vcpu->run->s390_sieic.ipb = vcpu->arch.sie_block->ipb;
3182                 return -EREMOTE;
3183         } else if (exit_reason != -EFAULT) {
3184                 vcpu->stat.exit_null++;
3185                 return 0;
3186         } else if (kvm_is_ucontrol(vcpu->kvm)) {
3187                 vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL;
3188                 vcpu->run->s390_ucontrol.trans_exc_code =
3189                                                 current->thread.gmap_addr;
3190                 vcpu->run->s390_ucontrol.pgm_code = 0x10;
3191                 return -EREMOTE;
3192         } else if (current->thread.gmap_pfault) {
3193                 trace_kvm_s390_major_guest_pfault(vcpu);
3194                 current->thread.gmap_pfault = 0;
3195                 if (kvm_arch_setup_async_pf(vcpu))
3196                         return 0;
3197                 return kvm_arch_fault_in_page(vcpu, current->thread.gmap_addr, 1);
3198         }
3199         return vcpu_post_run_fault_in_sie(vcpu);
3200 }
3201
3202 static int __vcpu_run(struct kvm_vcpu *vcpu)
3203 {
3204         int rc, exit_reason;
3205
3206         /*
3207          * We try to hold kvm->srcu during most of vcpu_run (except when run-
3208          * ning the guest), so that memslots (and other stuff) are protected
3209          */
3210         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
3211
3212         do {
3213                 rc = vcpu_pre_run(vcpu);
3214                 if (rc)
3215                         break;
3216
3217                 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
3218                 /*
3219                  * As PF_VCPU will be used in fault handler, between
3220                  * guest_enter and guest_exit should be no uaccess.
3221                  */
3222                 local_irq_disable();
3223                 guest_enter_irqoff();
3224                 __disable_cpu_timer_accounting(vcpu);
3225                 local_irq_enable();
3226                 exit_reason = sie64a(vcpu->arch.sie_block,
3227                                      vcpu->run->s.regs.gprs);
3228                 local_irq_disable();
3229                 __enable_cpu_timer_accounting(vcpu);
3230                 guest_exit_irqoff();
3231                 local_irq_enable();
3232                 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
3233
3234                 rc = vcpu_post_run(vcpu, exit_reason);
3235         } while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc);
3236
3237         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
3238         return rc;
3239 }
3240
3241 static void sync_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3242 {
3243         struct runtime_instr_cb *riccb;
3244         struct gs_cb *gscb;
3245
3246         riccb = (struct runtime_instr_cb *) &kvm_run->s.regs.riccb;
3247         gscb = (struct gs_cb *) &kvm_run->s.regs.gscb;
3248         vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
3249         vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
3250         if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX)
3251                 kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
3252         if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) {
3253                 memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128);
3254                 /* some control register changes require a tlb flush */
3255                 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
3256         }
3257         if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
3258                 kvm_s390_set_cpu_timer(vcpu, kvm_run->s.regs.cputm);
3259                 vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc;
3260                 vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr;
3261                 vcpu->arch.sie_block->pp = kvm_run->s.regs.pp;
3262                 vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea;
3263         }
3264         if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) {
3265                 vcpu->arch.pfault_token = kvm_run->s.regs.pft;
3266                 vcpu->arch.pfault_select = kvm_run->s.regs.pfs;
3267                 vcpu->arch.pfault_compare = kvm_run->s.regs.pfc;
3268                 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
3269                         kvm_clear_async_pf_completion_queue(vcpu);
3270         }
3271         /*
3272          * If userspace sets the riccb (e.g. after migration) to a valid state,
3273          * we should enable RI here instead of doing the lazy enablement.
3274          */
3275         if ((kvm_run->kvm_dirty_regs & KVM_SYNC_RICCB) &&
3276             test_kvm_facility(vcpu->kvm, 64) &&
3277             riccb->valid &&
3278             !(vcpu->arch.sie_block->ecb3 & ECB3_RI)) {
3279                 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (sync_regs)");
3280                 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
3281         }
3282         /*
3283          * If userspace sets the gscb (e.g. after migration) to non-zero,
3284          * we should enable GS here instead of doing the lazy enablement.
3285          */
3286         if ((kvm_run->kvm_dirty_regs & KVM_SYNC_GSCB) &&
3287             test_kvm_facility(vcpu->kvm, 133) &&
3288             gscb->gssm &&
3289             !vcpu->arch.gs_enabled) {
3290                 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (sync_regs)");
3291                 vcpu->arch.sie_block->ecb |= ECB_GS;
3292                 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
3293                 vcpu->arch.gs_enabled = 1;
3294         }
3295         save_access_regs(vcpu->arch.host_acrs);
3296         restore_access_regs(vcpu->run->s.regs.acrs);
3297         /* save host (userspace) fprs/vrs */
3298         save_fpu_regs();
3299         vcpu->arch.host_fpregs.fpc = current->thread.fpu.fpc;
3300         vcpu->arch.host_fpregs.regs = current->thread.fpu.regs;
3301         if (MACHINE_HAS_VX)
3302                 current->thread.fpu.regs = vcpu->run->s.regs.vrs;
3303         else
3304                 current->thread.fpu.regs = vcpu->run->s.regs.fprs;
3305         current->thread.fpu.fpc = vcpu->run->s.regs.fpc;
3306         if (test_fp_ctl(current->thread.fpu.fpc))
3307                 /* User space provided an invalid FPC, let's clear it */
3308                 current->thread.fpu.fpc = 0;
3309         if (MACHINE_HAS_GS) {
3310                 preempt_disable();
3311                 __ctl_set_bit(2, 4);
3312                 if (current->thread.gs_cb) {
3313                         vcpu->arch.host_gscb = current->thread.gs_cb;
3314                         save_gs_cb(vcpu->arch.host_gscb);
3315                 }
3316                 if (vcpu->arch.gs_enabled) {
3317                         current->thread.gs_cb = (struct gs_cb *)
3318                                                 &vcpu->run->s.regs.gscb;
3319                         restore_gs_cb(current->thread.gs_cb);
3320                 }
3321                 preempt_enable();
3322         }
3323
3324         kvm_run->kvm_dirty_regs = 0;
3325 }
3326
3327 static void store_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3328 {
3329         kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask;
3330         kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr;
3331         kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu);
3332         memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128);
3333         kvm_run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu);
3334         kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc;
3335         kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr;
3336         kvm_run->s.regs.pp = vcpu->arch.sie_block->pp;
3337         kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea;
3338         kvm_run->s.regs.pft = vcpu->arch.pfault_token;
3339         kvm_run->s.regs.pfs = vcpu->arch.pfault_select;
3340         kvm_run->s.regs.pfc = vcpu->arch.pfault_compare;
3341         save_access_regs(vcpu->run->s.regs.acrs);
3342         restore_access_regs(vcpu->arch.host_acrs);
3343         /* Save guest register state */
3344         save_fpu_regs();
3345         vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
3346         /* Restore will be done lazily at return */
3347         current->thread.fpu.fpc = vcpu->arch.host_fpregs.fpc;
3348         current->thread.fpu.regs = vcpu->arch.host_fpregs.regs;
3349         if (MACHINE_HAS_GS) {
3350                 __ctl_set_bit(2, 4);
3351                 if (vcpu->arch.gs_enabled)
3352                         save_gs_cb(current->thread.gs_cb);
3353                 preempt_disable();
3354                 current->thread.gs_cb = vcpu->arch.host_gscb;
3355                 restore_gs_cb(vcpu->arch.host_gscb);
3356                 preempt_enable();
3357                 if (!vcpu->arch.host_gscb)
3358                         __ctl_clear_bit(2, 4);
3359                 vcpu->arch.host_gscb = NULL;
3360         }
3361
3362 }
3363
3364 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3365 {
3366         int rc;
3367         sigset_t sigsaved;
3368
3369         if (kvm_run->immediate_exit)
3370                 return -EINTR;
3371
3372         if (guestdbg_exit_pending(vcpu)) {
3373                 kvm_s390_prepare_debug_exit(vcpu);
3374                 return 0;
3375         }
3376
3377         if (vcpu->sigset_active)
3378                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
3379
3380         if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) {
3381                 kvm_s390_vcpu_start(vcpu);
3382         } else if (is_vcpu_stopped(vcpu)) {
3383                 pr_err_ratelimited("can't run stopped vcpu %d\n",
3384                                    vcpu->vcpu_id);
3385                 return -EINVAL;
3386         }
3387
3388         sync_regs(vcpu, kvm_run);
3389         enable_cpu_timer_accounting(vcpu);
3390
3391         might_fault();
3392         rc = __vcpu_run(vcpu);
3393
3394         if (signal_pending(current) && !rc) {
3395                 kvm_run->exit_reason = KVM_EXIT_INTR;
3396                 rc = -EINTR;
3397         }
3398
3399         if (guestdbg_exit_pending(vcpu) && !rc)  {
3400                 kvm_s390_prepare_debug_exit(vcpu);
3401                 rc = 0;
3402         }
3403
3404         if (rc == -EREMOTE) {
3405                 /* userspace support is needed, kvm_run has been prepared */
3406                 rc = 0;
3407         }
3408
3409         disable_cpu_timer_accounting(vcpu);
3410         store_regs(vcpu, kvm_run);
3411
3412         if (vcpu->sigset_active)
3413                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
3414
3415         vcpu->stat.exit_userspace++;
3416         return rc;
3417 }
3418
3419 /*
3420  * store status at address
3421  * we use have two special cases:
3422  * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit
3423  * KVM_S390_STORE_STATUS_PREFIXED: -> prefix
3424  */
3425 int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa)
3426 {
3427         unsigned char archmode = 1;
3428         freg_t fprs[NUM_FPRS];
3429         unsigned int px;
3430         u64 clkcomp, cputm;
3431         int rc;
3432
3433         px = kvm_s390_get_prefix(vcpu);
3434         if (gpa == KVM_S390_STORE_STATUS_NOADDR) {
3435                 if (write_guest_abs(vcpu, 163, &archmode, 1))
3436                         return -EFAULT;
3437                 gpa = 0;
3438         } else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) {
3439                 if (write_guest_real(vcpu, 163, &archmode, 1))
3440                         return -EFAULT;
3441                 gpa = px;
3442         } else
3443                 gpa -= __LC_FPREGS_SAVE_AREA;
3444
3445         /* manually convert vector registers if necessary */
3446         if (MACHINE_HAS_VX) {
3447                 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
3448                 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
3449                                      fprs, 128);
3450         } else {
3451                 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
3452                                      vcpu->run->s.regs.fprs, 128);
3453         }
3454         rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA,
3455                               vcpu->run->s.regs.gprs, 128);
3456         rc |= write_guest_abs(vcpu, gpa + __LC_PSW_SAVE_AREA,
3457                               &vcpu->arch.sie_block->gpsw, 16);
3458         rc |= write_guest_abs(vcpu, gpa + __LC_PREFIX_SAVE_AREA,
3459                               &px, 4);
3460         rc |= write_guest_abs(vcpu, gpa + __LC_FP_CREG_SAVE_AREA,
3461                               &vcpu->run->s.regs.fpc, 4);
3462         rc |= write_guest_abs(vcpu, gpa + __LC_TOD_PROGREG_SAVE_AREA,
3463                               &vcpu->arch.sie_block->todpr, 4);
3464         cputm = kvm_s390_get_cpu_timer(vcpu);
3465         rc |= write_guest_abs(vcpu, gpa + __LC_CPU_TIMER_SAVE_AREA,
3466                               &cputm, 8);
3467         clkcomp = vcpu->arch.sie_block->ckc >> 8;
3468         rc |= write_guest_abs(vcpu, gpa + __LC_CLOCK_COMP_SAVE_AREA,
3469                               &clkcomp, 8);
3470         rc |= write_guest_abs(vcpu, gpa + __LC_AREGS_SAVE_AREA,
3471                               &vcpu->run->s.regs.acrs, 64);
3472         rc |= write_guest_abs(vcpu, gpa + __LC_CREGS_SAVE_AREA,
3473                               &vcpu->arch.sie_block->gcr, 128);
3474         return rc ? -EFAULT : 0;
3475 }
3476
3477 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
3478 {
3479         /*
3480          * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy
3481          * switch in the run ioctl. Let's update our copies before we save
3482          * it into the save area
3483          */
3484         save_fpu_regs();
3485         vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
3486         save_access_regs(vcpu->run->s.regs.acrs);
3487
3488         return kvm_s390_store_status_unloaded(vcpu, addr);
3489 }
3490
3491 static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
3492 {
3493         kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu);
3494         kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu);
3495 }
3496
3497 static void __disable_ibs_on_all_vcpus(struct kvm *kvm)
3498 {
3499         unsigned int i;
3500         struct kvm_vcpu *vcpu;
3501
3502         kvm_for_each_vcpu(i, vcpu, kvm) {
3503                 __disable_ibs_on_vcpu(vcpu);
3504         }
3505 }
3506
3507 static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
3508 {
3509         if (!sclp.has_ibs)
3510                 return;
3511         kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu);
3512         kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu);
3513 }
3514
3515 void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu)
3516 {
3517         int i, online_vcpus, started_vcpus = 0;
3518
3519         if (!is_vcpu_stopped(vcpu))
3520                 return;
3521
3522         trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1);
3523         /* Only one cpu at a time may enter/leave the STOPPED state. */
3524         spin_lock(&vcpu->kvm->arch.start_stop_lock);
3525         online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
3526
3527         for (i = 0; i < online_vcpus; i++) {
3528                 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i]))
3529                         started_vcpus++;
3530         }
3531
3532         if (started_vcpus == 0) {
3533                 /* we're the only active VCPU -> speed it up */
3534                 __enable_ibs_on_vcpu(vcpu);
3535         } else if (started_vcpus == 1) {
3536                 /*
3537                  * As we are starting a second VCPU, we have to disable
3538                  * the IBS facility on all VCPUs to remove potentially
3539                  * oustanding ENABLE requests.
3540                  */
3541                 __disable_ibs_on_all_vcpus(vcpu->kvm);
3542         }
3543
3544         atomic_andnot(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
3545         /*
3546          * Another VCPU might have used IBS while we were offline.
3547          * Let's play safe and flush the VCPU at startup.
3548          */
3549         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
3550         spin_unlock(&vcpu->kvm->arch.start_stop_lock);
3551         return;
3552 }
3553
3554 void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu)
3555 {
3556         int i, online_vcpus, started_vcpus = 0;
3557         struct kvm_vcpu *started_vcpu = NULL;
3558
3559         if (is_vcpu_stopped(vcpu))
3560                 return;
3561
3562         trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0);
3563         /* Only one cpu at a time may enter/leave the STOPPED state. */
3564         spin_lock(&vcpu->kvm->arch.start_stop_lock);
3565         online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
3566
3567         /* SIGP STOP and SIGP STOP AND STORE STATUS has been fully processed */
3568         kvm_s390_clear_stop_irq(vcpu);
3569
3570         atomic_or(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
3571         __disable_ibs_on_vcpu(vcpu);
3572
3573         for (i = 0; i < online_vcpus; i++) {
3574                 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i])) {
3575                         started_vcpus++;
3576                         started_vcpu = vcpu->kvm->vcpus[i];
3577                 }
3578         }
3579
3580         if (started_vcpus == 1) {
3581                 /*
3582                  * As we only have one VCPU left, we want to enable the
3583                  * IBS facility for that VCPU to speed it up.
3584                  */
3585                 __enable_ibs_on_vcpu(started_vcpu);
3586         }
3587
3588         spin_unlock(&vcpu->kvm->arch.start_stop_lock);
3589         return;
3590 }
3591
3592 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
3593                                      struct kvm_enable_cap *cap)
3594 {
3595         int r;
3596
3597         if (cap->flags)
3598                 return -EINVAL;
3599
3600         switch (cap->cap) {
3601         case KVM_CAP_S390_CSS_SUPPORT:
3602                 if (!vcpu->kvm->arch.css_support) {
3603                         vcpu->kvm->arch.css_support = 1;
3604                         VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support");
3605                         trace_kvm_s390_enable_css(vcpu->kvm);
3606                 }
3607                 r = 0;
3608                 break;
3609         default:
3610                 r = -EINVAL;
3611                 break;
3612         }
3613         return r;
3614 }
3615
3616 static long kvm_s390_guest_mem_op(struct kvm_vcpu *vcpu,
3617                                   struct kvm_s390_mem_op *mop)
3618 {
3619         void __user *uaddr = (void __user *)mop->buf;
3620         void *tmpbuf = NULL;
3621         int r, srcu_idx;
3622         const u64 supported_flags = KVM_S390_MEMOP_F_INJECT_EXCEPTION
3623                                     | KVM_S390_MEMOP_F_CHECK_ONLY;
3624
3625         if (mop->flags & ~supported_flags)
3626                 return -EINVAL;
3627
3628         if (mop->size > MEM_OP_MAX_SIZE)
3629                 return -E2BIG;
3630
3631         if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) {
3632                 tmpbuf = vmalloc(mop->size);
3633                 if (!tmpbuf)
3634                         return -ENOMEM;
3635         }
3636
3637         srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
3638
3639         switch (mop->op) {
3640         case KVM_S390_MEMOP_LOGICAL_READ:
3641                 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
3642                         r = check_gva_range(vcpu, mop->gaddr, mop->ar,
3643                                             mop->size, GACC_FETCH);
3644                         break;
3645                 }
3646                 r = read_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size);
3647                 if (r == 0) {
3648                         if (copy_to_user(uaddr, tmpbuf, mop->size))
3649                                 r = -EFAULT;
3650                 }
3651                 break;
3652         case KVM_S390_MEMOP_LOGICAL_WRITE:
3653                 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
3654                         r = check_gva_range(vcpu, mop->gaddr, mop->ar,
3655                                             mop->size, GACC_STORE);
3656                         break;
3657                 }
3658                 if (copy_from_user(tmpbuf, uaddr, mop->size)) {
3659                         r = -EFAULT;
3660                         break;
3661                 }
3662                 r = write_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size);
3663                 break;
3664         default:
3665                 r = -EINVAL;
3666         }
3667
3668         srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
3669
3670         if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0)
3671                 kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
3672
3673         vfree(tmpbuf);
3674         return r;
3675 }
3676
3677 long kvm_arch_vcpu_ioctl(struct file *filp,
3678                          unsigned int ioctl, unsigned long arg)
3679 {
3680         struct kvm_vcpu *vcpu = filp->private_data;
3681         void __user *argp = (void __user *)arg;
3682         int idx;
3683         long r;
3684
3685         switch (ioctl) {
3686         case KVM_S390_IRQ: {
3687                 struct kvm_s390_irq s390irq;
3688
3689                 r = -EFAULT;
3690                 if (copy_from_user(&s390irq, argp, sizeof(s390irq)))
3691                         break;
3692                 r = kvm_s390_inject_vcpu(vcpu, &s390irq);
3693                 break;
3694         }
3695         case KVM_S390_INTERRUPT: {
3696                 struct kvm_s390_interrupt s390int;
3697                 struct kvm_s390_irq s390irq;
3698
3699                 r = -EFAULT;
3700                 if (copy_from_user(&s390int, argp, sizeof(s390int)))
3701                         break;
3702                 if (s390int_to_s390irq(&s390int, &s390irq))
3703                         return -EINVAL;
3704                 r = kvm_s390_inject_vcpu(vcpu, &s390irq);
3705                 break;
3706         }
3707         case KVM_S390_STORE_STATUS:
3708                 idx = srcu_read_lock(&vcpu->kvm->srcu);
3709                 r = kvm_s390_vcpu_store_status(vcpu, arg);
3710                 srcu_read_unlock(&vcpu->kvm->srcu, idx);
3711                 break;
3712         case KVM_S390_SET_INITIAL_PSW: {
3713                 psw_t psw;
3714
3715                 r = -EFAULT;
3716                 if (copy_from_user(&psw, argp, sizeof(psw)))
3717                         break;
3718                 r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
3719                 break;
3720         }
3721         case KVM_S390_INITIAL_RESET:
3722                 r = kvm_arch_vcpu_ioctl_initial_reset(vcpu);
3723                 break;
3724         case KVM_SET_ONE_REG:
3725         case KVM_GET_ONE_REG: {
3726                 struct kvm_one_reg reg;
3727                 r = -EFAULT;
3728                 if (copy_from_user(&reg, argp, sizeof(reg)))
3729                         break;
3730                 if (ioctl == KVM_SET_ONE_REG)
3731                         r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, &reg);
3732                 else
3733                         r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, &reg);
3734                 break;
3735         }
3736 #ifdef CONFIG_KVM_S390_UCONTROL
3737         case KVM_S390_UCAS_MAP: {
3738                 struct kvm_s390_ucas_mapping ucasmap;
3739
3740                 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
3741                         r = -EFAULT;
3742                         break;
3743                 }
3744
3745                 if (!kvm_is_ucontrol(vcpu->kvm)) {
3746                         r = -EINVAL;
3747                         break;
3748                 }
3749
3750                 r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr,
3751                                      ucasmap.vcpu_addr, ucasmap.length);
3752                 break;
3753         }
3754         case KVM_S390_UCAS_UNMAP: {
3755                 struct kvm_s390_ucas_mapping ucasmap;
3756
3757                 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
3758                         r = -EFAULT;
3759                         break;
3760                 }
3761
3762                 if (!kvm_is_ucontrol(vcpu->kvm)) {
3763                         r = -EINVAL;
3764                         break;
3765                 }
3766
3767                 r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr,
3768                         ucasmap.length);
3769                 break;
3770         }
3771 #endif
3772         case KVM_S390_VCPU_FAULT: {
3773                 r = gmap_fault(vcpu->arch.gmap, arg, 0);
3774                 break;
3775         }
3776         case KVM_ENABLE_CAP:
3777         {
3778                 struct kvm_enable_cap cap;
3779                 r = -EFAULT;
3780                 if (copy_from_user(&cap, argp, sizeof(cap)))
3781                         break;
3782                 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
3783                 break;
3784         }
3785         case KVM_S390_MEM_OP: {
3786                 struct kvm_s390_mem_op mem_op;
3787
3788                 if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0)
3789                         r = kvm_s390_guest_mem_op(vcpu, &mem_op);
3790                 else
3791                         r = -EFAULT;
3792                 break;
3793         }
3794         case KVM_S390_SET_IRQ_STATE: {
3795                 struct kvm_s390_irq_state irq_state;
3796
3797                 r = -EFAULT;
3798                 if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
3799                         break;
3800                 if (irq_state.len > VCPU_IRQS_MAX_BUF ||
3801                     irq_state.len == 0 ||
3802                     irq_state.len % sizeof(struct kvm_s390_irq) > 0) {
3803                         r = -EINVAL;
3804                         break;
3805                 }
3806                 r = kvm_s390_set_irq_state(vcpu,
3807                                            (void __user *) irq_state.buf,
3808                                            irq_state.len);
3809                 break;
3810         }
3811         case KVM_S390_GET_IRQ_STATE: {
3812                 struct kvm_s390_irq_state irq_state;
3813
3814                 r = -EFAULT;
3815                 if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
3816                         break;
3817                 if (irq_state.len == 0) {
3818                         r = -EINVAL;
3819                         break;
3820                 }
3821                 r = kvm_s390_get_irq_state(vcpu,
3822                                            (__u8 __user *)  irq_state.buf,
3823                                            irq_state.len);
3824                 break;
3825         }
3826         default:
3827                 r = -ENOTTY;
3828         }
3829         return r;
3830 }
3831
3832 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
3833 {
3834 #ifdef CONFIG_KVM_S390_UCONTROL
3835         if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET)
3836                  && (kvm_is_ucontrol(vcpu->kvm))) {
3837                 vmf->page = virt_to_page(vcpu->arch.sie_block);
3838                 get_page(vmf->page);
3839                 return 0;
3840         }
3841 #endif
3842         return VM_FAULT_SIGBUS;
3843 }
3844
3845 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
3846                             unsigned long npages)
3847 {
3848         return 0;
3849 }
3850
3851 /* Section: memory related */
3852 int kvm_arch_prepare_memory_region(struct kvm *kvm,
3853                                    struct kvm_memory_slot *memslot,
3854                                    const struct kvm_userspace_memory_region *mem,
3855                                    enum kvm_mr_change change)
3856 {
3857         /* A few sanity checks. We can have memory slots which have to be
3858            located/ended at a segment boundary (1MB). The memory in userland is
3859            ok to be fragmented into various different vmas. It is okay to mmap()
3860            and munmap() stuff in this slot after doing this call at any time */
3861
3862         if (mem->userspace_addr & 0xffffful)
3863                 return -EINVAL;
3864
3865         if (mem->memory_size & 0xffffful)
3866                 return -EINVAL;
3867
3868         if (mem->guest_phys_addr + mem->memory_size > kvm->arch.mem_limit)
3869                 return -EINVAL;
3870
3871         return 0;
3872 }
3873
3874 void kvm_arch_commit_memory_region(struct kvm *kvm,
3875                                 const struct kvm_userspace_memory_region *mem,
3876                                 const struct kvm_memory_slot *old,
3877                                 const struct kvm_memory_slot *new,
3878                                 enum kvm_mr_change change)
3879 {
3880         int rc;
3881
3882         /* If the basics of the memslot do not change, we do not want
3883          * to update the gmap. Every update causes several unnecessary
3884          * segment translation exceptions. This is usually handled just
3885          * fine by the normal fault handler + gmap, but it will also
3886          * cause faults on the prefix page of running guest CPUs.
3887          */
3888         if (old->userspace_addr == mem->userspace_addr &&
3889             old->base_gfn * PAGE_SIZE == mem->guest_phys_addr &&
3890             old->npages * PAGE_SIZE == mem->memory_size)
3891                 return;
3892
3893         rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr,
3894                 mem->guest_phys_addr, mem->memory_size);
3895         if (rc)
3896                 pr_warn("failed to commit memory region\n");
3897         return;
3898 }
3899
3900 static inline unsigned long nonhyp_mask(int i)
3901 {
3902         unsigned int nonhyp_fai = (sclp.hmfai << i * 2) >> 30;
3903
3904         return 0x0000ffffffffffffUL >> (nonhyp_fai << 4);
3905 }
3906
3907 void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu)
3908 {
3909         vcpu->valid_wakeup = false;
3910 }
3911
3912 static int __init kvm_s390_init(void)
3913 {
3914         int i;
3915
3916         if (!sclp.has_sief2) {
3917                 pr_info("SIE not available\n");
3918                 return -ENODEV;
3919         }
3920
3921         for (i = 0; i < 16; i++)
3922                 kvm_s390_fac_list_mask[i] |=
3923                         S390_lowcore.stfle_fac_list[i] & nonhyp_mask(i);
3924
3925         return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
3926 }
3927
3928 static void __exit kvm_s390_exit(void)
3929 {
3930         kvm_exit();
3931 }
3932
3933 module_init(kvm_s390_init);
3934 module_exit(kvm_s390_exit);
3935
3936 /*
3937  * Enable autoloading of the kvm module.
3938  * Note that we add the module alias here instead of virt/kvm/kvm_main.c
3939  * since x86 takes a different approach.
3940  */
3941 #include <linux/miscdevice.h>
3942 MODULE_ALIAS_MISCDEV(KVM_MINOR);
3943 MODULE_ALIAS("devname:kvm");