arch/s390/kvm/kvm-s390.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * hosting IBM Z kernel virtual machines (s390x)
   4  *
   5  * Copyright IBM Corp. 2008, 2017
   6  *
   7  *    Author(s): Carsten Otte <cotte@de.ibm.com>
   8  *               Christian Borntraeger <borntraeger@de.ibm.com>
   9  *               Heiko Carstens <heiko.carstens@de.ibm.com>
  10  *               Christian Ehrhardt <ehrhardt@de.ibm.com>
  11  *               Jason J. Herne <jjherne@us.ibm.com>
  12  */
  13
  14 #include <linux/compiler.h>
  15 #include <linux/err.h>
  16 #include <linux/fs.h>
  17 #include <linux/hrtimer.h>
  18 #include <linux/init.h>
  19 #include <linux/kvm.h>
  20 #include <linux/kvm_host.h>
  21 #include <linux/mman.h>
  22 #include <linux/module.h>
  23 #include <linux/moduleparam.h>
  24 #include <linux/random.h>
  25 #include <linux/slab.h>
  26 #include <linux/timer.h>
  27 #include <linux/vmalloc.h>
  28 #include <linux/bitmap.h>
  29 #include <linux/sched/signal.h>
  30 #include <linux/string.h>
  31
  32 #include <asm/asm-offsets.h>
  33 #include <asm/lowcore.h>
  34 #include <asm/stp.h>
  35 #include <asm/pgtable.h>
  36 #include <asm/gmap.h>
  37 #include <asm/nmi.h>
  38 #include <asm/switch_to.h>
  39 #include <asm/isc.h>
  40 #include <asm/sclp.h>
  41 #include <asm/cpacf.h>
  42 #include <asm/timex.h>
  43 #include "kvm-s390.h"
  44 #include "gaccess.h"
  45
  46 #define KMSG_COMPONENT "kvm-s390"
  47 #undef pr_fmt
  48 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  49
  50 #define CREATE_TRACE_POINTS
  51 #include "trace.h"
  52 #include "trace-s390.h"
  53
  54 #define MEM_OP_MAX_SIZE 65536   /* Maximum transfer size for KVM_S390_MEM_OP */
  55 #define LOCAL_IRQS 32
  56 #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
  57                            (KVM_MAX_VCPUS + LOCAL_IRQS))
  58
  59 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
  60
  61 struct kvm_stats_debugfs_item debugfs_entries[] = {
  62         { "userspace_handled", VCPU_STAT(exit_userspace) },
  63         { "exit_null", VCPU_STAT(exit_null) },
  64         { "exit_validity", VCPU_STAT(exit_validity) },
  65         { "exit_stop_request", VCPU_STAT(exit_stop_request) },
  66         { "exit_external_request", VCPU_STAT(exit_external_request) },
  67         { "exit_external_interrupt", VCPU_STAT(exit_external_interrupt) },
  68         { "exit_instruction", VCPU_STAT(exit_instruction) },
  69         { "exit_pei", VCPU_STAT(exit_pei) },
  70         { "exit_program_interruption", VCPU_STAT(exit_program_interruption) },
  71         { "exit_instr_and_program_int", VCPU_STAT(exit_instr_and_program) },
  72         { "exit_operation_exception", VCPU_STAT(exit_operation_exception) },
  73         { "halt_successful_poll", VCPU_STAT(halt_successful_poll) },
  74         { "halt_attempted_poll", VCPU_STAT(halt_attempted_poll) },
  75         { "halt_poll_invalid", VCPU_STAT(halt_poll_invalid) },
  76         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
  77         { "instruction_lctlg", VCPU_STAT(instruction_lctlg) },
  78         { "instruction_lctl", VCPU_STAT(instruction_lctl) },
  79         { "instruction_stctl", VCPU_STAT(instruction_stctl) },
  80         { "instruction_stctg", VCPU_STAT(instruction_stctg) },
  81         { "deliver_emergency_signal", VCPU_STAT(deliver_emergency_signal) },
  82         { "deliver_external_call", VCPU_STAT(deliver_external_call) },
  83         { "deliver_service_signal", VCPU_STAT(deliver_service_signal) },
  84         { "deliver_virtio_interrupt", VCPU_STAT(deliver_virtio_interrupt) },
  85         { "deliver_stop_signal", VCPU_STAT(deliver_stop_signal) },
  86         { "deliver_prefix_signal", VCPU_STAT(deliver_prefix_signal) },
  87         { "deliver_restart_signal", VCPU_STAT(deliver_restart_signal) },
  88         { "deliver_program_interruption", VCPU_STAT(deliver_program_int) },
  89         { "exit_wait_state", VCPU_STAT(exit_wait_state) },
  90         { "instruction_pfmf", VCPU_STAT(instruction_pfmf) },
  91         { "instruction_stidp", VCPU_STAT(instruction_stidp) },
  92         { "instruction_spx", VCPU_STAT(instruction_spx) },
  93         { "instruction_stpx", VCPU_STAT(instruction_stpx) },
  94         { "instruction_stap", VCPU_STAT(instruction_stap) },
  95         { "instruction_storage_key", VCPU_STAT(instruction_storage_key) },
  96         { "instruction_ipte_interlock", VCPU_STAT(instruction_ipte_interlock) },
  97         { "instruction_stsch", VCPU_STAT(instruction_stsch) },
  98         { "instruction_chsc", VCPU_STAT(instruction_chsc) },
  99         { "instruction_essa", VCPU_STAT(instruction_essa) },
 100         { "instruction_stsi", VCPU_STAT(instruction_stsi) },
 101         { "instruction_stfl", VCPU_STAT(instruction_stfl) },
 102         { "instruction_tprot", VCPU_STAT(instruction_tprot) },
 103         { "instruction_sthyi", VCPU_STAT(instruction_sthyi) },
 104         { "instruction_sie", VCPU_STAT(instruction_sie) },
 105         { "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) },
 106         { "instruction_sigp_sense_running", VCPU_STAT(instruction_sigp_sense_running) },
 107         { "instruction_sigp_external_call", VCPU_STAT(instruction_sigp_external_call) },
 108         { "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) },
 109         { "instruction_sigp_cond_emergency", VCPU_STAT(instruction_sigp_cond_emergency) },
 110         { "instruction_sigp_start", VCPU_STAT(instruction_sigp_start) },
 111         { "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) },
 112         { "instruction_sigp_stop_store_status", VCPU_STAT(instruction_sigp_stop_store_status) },
 113         { "instruction_sigp_store_status", VCPU_STAT(instruction_sigp_store_status) },
 114         { "instruction_sigp_store_adtl_status", VCPU_STAT(instruction_sigp_store_adtl_status) },
 115         { "instruction_sigp_set_arch", VCPU_STAT(instruction_sigp_arch) },
 116         { "instruction_sigp_set_prefix", VCPU_STAT(instruction_sigp_prefix) },
 117         { "instruction_sigp_restart", VCPU_STAT(instruction_sigp_restart) },
 118         { "instruction_sigp_cpu_reset", VCPU_STAT(instruction_sigp_cpu_reset) },
 119         { "instruction_sigp_init_cpu_reset", VCPU_STAT(instruction_sigp_init_cpu_reset) },
 120         { "instruction_sigp_unknown", VCPU_STAT(instruction_sigp_unknown) },
 121         { "diagnose_10", VCPU_STAT(diagnose_10) },
 122         { "diagnose_44", VCPU_STAT(diagnose_44) },
 123         { "diagnose_9c", VCPU_STAT(diagnose_9c) },
 124         { "diagnose_258", VCPU_STAT(diagnose_258) },
 125         { "diagnose_308", VCPU_STAT(diagnose_308) },
 126         { "diagnose_500", VCPU_STAT(diagnose_500) },
 127         { NULL }
 128 };
 129
 130 struct kvm_s390_tod_clock_ext {
 131         __u8 epoch_idx;
 132         __u64 tod;
 133         __u8 reserved[7];
 134 } __packed;
 135
 136 /* allow nested virtualization in KVM (if enabled by user space) */
 137 static int nested;
 138 module_param(nested, int, S_IRUGO);
 139 MODULE_PARM_DESC(nested, "Nested virtualization support");
 140
 141 /* upper facilities limit for kvm */
 142 unsigned long kvm_s390_fac_list_mask[16] = { FACILITIES_KVM };
 143
 144 unsigned long kvm_s390_fac_list_mask_size(void)
 145 {
 146         BUILD_BUG_ON(ARRAY_SIZE(kvm_s390_fac_list_mask) > S390_ARCH_FAC_MASK_SIZE_U64);
 147         return ARRAY_SIZE(kvm_s390_fac_list_mask);
 148 }
 149
 150 /* available cpu features supported by kvm */
 151 static DECLARE_BITMAP(kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
 152 /* available subfunctions indicated via query / "test bit" */
 153 static struct kvm_s390_vm_cpu_subfunc kvm_s390_available_subfunc;
 154
 155 static struct gmap_notifier gmap_notifier;
 156 static struct gmap_notifier vsie_gmap_notifier;
 157 debug_info_t *kvm_s390_dbf;
 158
 159 /* Section: not file related */
 160 int kvm_arch_hardware_enable(void)
 161 {
 162         /* every s390 is virtualization enabled ;-) */
 163         return 0;
 164 }
 165
 166 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
 167                               unsigned long end);
 168
 169 /*
 170  * This callback is executed during stop_machine(). All CPUs are therefore
 171  * temporarily stopped. In order not to change guest behavior, we have to
 172  * disable preemption whenever we touch the epoch of kvm and the VCPUs,
 173  * so a CPU won't be stopped while calculating with the epoch.
 174  */
 175 static int kvm_clock_sync(struct notifier_block *notifier, unsigned long val,
 176                           void *v)
 177 {
 178         struct kvm *kvm;
 179         struct kvm_vcpu *vcpu;
 180         int i;
 181         unsigned long long *delta = v;
 182
 183         list_for_each_entry(kvm, &vm_list, vm_list) {
 184                 kvm->arch.epoch -= *delta;
 185                 kvm_for_each_vcpu(i, vcpu, kvm) {
 186                         vcpu->arch.sie_block->epoch -= *delta;
 187                         if (vcpu->arch.cputm_enabled)
 188                                 vcpu->arch.cputm_start += *delta;
 189                         if (vcpu->arch.vsie_block)
 190                                 vcpu->arch.vsie_block->epoch -= *delta;
 191                 }
 192         }
 193         return NOTIFY_OK;
 194 }
 195
 196 static struct notifier_block kvm_clock_notifier = {
 197         .notifier_call = kvm_clock_sync,
 198 };
 199
 200 int kvm_arch_hardware_setup(void)
 201 {
 202         gmap_notifier.notifier_call = kvm_gmap_notifier;
 203         gmap_register_pte_notifier(&gmap_notifier);
 204         vsie_gmap_notifier.notifier_call = kvm_s390_vsie_gmap_notifier;
 205         gmap_register_pte_notifier(&vsie_gmap_notifier);
 206         atomic_notifier_chain_register(&s390_epoch_delta_notifier,
 207                                        &kvm_clock_notifier);
 208         return 0;
 209 }
 210
 211 void kvm_arch_hardware_unsetup(void)
 212 {
 213         gmap_unregister_pte_notifier(&gmap_notifier);
 214         gmap_unregister_pte_notifier(&vsie_gmap_notifier);
 215         atomic_notifier_chain_unregister(&s390_epoch_delta_notifier,
 216                                          &kvm_clock_notifier);
 217 }
 218
 219 static void allow_cpu_feat(unsigned long nr)
 220 {
 221         set_bit_inv(nr, kvm_s390_available_cpu_feat);
 222 }
 223
 224 static inline int plo_test_bit(unsigned char nr)
 225 {
 226         register unsigned long r0 asm("0") = (unsigned long) nr | 0x100;
 227         int cc;
 228
 229         asm volatile(
 230                 /* Parameter registers are ignored for "test bit" */
 231                 "       plo     0,0,0,0(0)\n"
 232                 "       ipm     %0\n"
 233                 "       srl     %0,28\n"
 234                 : "=d" (cc)
 235                 : "d" (r0)
 236                 : "cc");
 237         return cc == 0;
 238 }
 239
 240 static void kvm_s390_cpu_feat_init(void)
 241 {
 242         int i;
 243
 244         for (i = 0; i < 256; ++i) {
 245                 if (plo_test_bit(i))
 246                         kvm_s390_available_subfunc.plo[i >> 3] |= 0x80 >> (i & 7);
 247         }
 248
 249         if (test_facility(28)) /* TOD-clock steering */
 250                 ptff(kvm_s390_available_subfunc.ptff,
 251                      sizeof(kvm_s390_available_subfunc.ptff),
 252                      PTFF_QAF);
 253
 254         if (test_facility(17)) { /* MSA */
 255                 __cpacf_query(CPACF_KMAC, (cpacf_mask_t *)
 256                               kvm_s390_available_subfunc.kmac);
 257                 __cpacf_query(CPACF_KMC, (cpacf_mask_t *)
 258                               kvm_s390_available_subfunc.kmc);
 259                 __cpacf_query(CPACF_KM, (cpacf_mask_t *)
 260                               kvm_s390_available_subfunc.km);
 261                 __cpacf_query(CPACF_KIMD, (cpacf_mask_t *)
 262                               kvm_s390_available_subfunc.kimd);
 263                 __cpacf_query(CPACF_KLMD, (cpacf_mask_t *)
 264                               kvm_s390_available_subfunc.klmd);
 265         }
 266         if (test_facility(76)) /* MSA3 */
 267                 __cpacf_query(CPACF_PCKMO, (cpacf_mask_t *)
 268                               kvm_s390_available_subfunc.pckmo);
 269         if (test_facility(77)) { /* MSA4 */
 270                 __cpacf_query(CPACF_KMCTR, (cpacf_mask_t *)
 271                               kvm_s390_available_subfunc.kmctr);
 272                 __cpacf_query(CPACF_KMF, (cpacf_mask_t *)
 273                               kvm_s390_available_subfunc.kmf);
 274                 __cpacf_query(CPACF_KMO, (cpacf_mask_t *)
 275                               kvm_s390_available_subfunc.kmo);
 276                 __cpacf_query(CPACF_PCC, (cpacf_mask_t *)
 277                               kvm_s390_available_subfunc.pcc);
 278         }
 279         if (test_facility(57)) /* MSA5 */
 280                 __cpacf_query(CPACF_PRNO, (cpacf_mask_t *)
 281                               kvm_s390_available_subfunc.ppno);
 282
 283         if (test_facility(146)) /* MSA8 */
 284                 __cpacf_query(CPACF_KMA, (cpacf_mask_t *)
 285                               kvm_s390_available_subfunc.kma);
 286
 287         if (MACHINE_HAS_ESOP)
 288                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP);
 289         /*
 290          * We need SIE support, ESOP (PROT_READ protection for gmap_shadow),
 291          * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing).
 292          */
 293         if (!sclp.has_sief2 || !MACHINE_HAS_ESOP || !sclp.has_64bscao ||
 294             !test_facility(3) || !nested)
 295                 return;
 296         allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2);
 297         if (sclp.has_64bscao)
 298                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO);
 299         if (sclp.has_siif)
 300                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF);
 301         if (sclp.has_gpere)
 302                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GPERE);
 303         if (sclp.has_gsls)
 304                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GSLS);
 305         if (sclp.has_ib)
 306                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IB);
 307         if (sclp.has_cei)
 308                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_CEI);
 309         if (sclp.has_ibs)
 310                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IBS);
 311         if (sclp.has_kss)
 312                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_KSS);
 313         /*
 314          * KVM_S390_VM_CPU_FEAT_SKEY: Wrong shadow of PTE.I bits will make
 315          * all skey handling functions read/set the skey from the PGSTE
 316          * instead of the real storage key.
 317          *
 318          * KVM_S390_VM_CPU_FEAT_CMMA: Wrong shadow of PTE.I bits will make
 319          * pages being detected as preserved although they are resident.
 320          *
 321          * KVM_S390_VM_CPU_FEAT_PFMFI: Wrong shadow of PTE.I bits will
 322          * have the same effect as for KVM_S390_VM_CPU_FEAT_SKEY.
 323          *
 324          * For KVM_S390_VM_CPU_FEAT_SKEY, KVM_S390_VM_CPU_FEAT_CMMA and
 325          * KVM_S390_VM_CPU_FEAT_PFMFI, all PTE.I and PGSTE bits have to be
 326          * correctly shadowed. We can do that for the PGSTE but not for PTE.I.
 327          *
 328          * KVM_S390_VM_CPU_FEAT_SIGPIF: Wrong SCB addresses in the SCA. We
 329          * cannot easily shadow the SCA because of the ipte lock.
 330          */
 331 }
 332
 333 int kvm_arch_init(void *opaque)
 334 {
 335         kvm_s390_dbf = debug_register("kvm-trace", 32, 1, 7 * sizeof(long));
 336         if (!kvm_s390_dbf)
 337                 return -ENOMEM;
 338
 339         if (debug_register_view(kvm_s390_dbf, &debug_sprintf_view)) {
 340                 debug_unregister(kvm_s390_dbf);
 341                 return -ENOMEM;
 342         }
 343
 344         kvm_s390_cpu_feat_init();
 345
 346         /* Register floating interrupt controller interface. */
 347         return kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC);
 348 }
 349
 350 void kvm_arch_exit(void)
 351 {
 352         debug_unregister(kvm_s390_dbf);
 353 }
 354
 355 /* Section: device related */
 356 long kvm_arch_dev_ioctl(struct file *filp,
 357                         unsigned int ioctl, unsigned long arg)
 358 {
 359         if (ioctl == KVM_S390_ENABLE_SIE)
 360                 return s390_enable_sie();
 361         return -EINVAL;
 362 }
 363
 364 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 365 {
 366         int r;
 367
 368         switch (ext) {
 369         case KVM_CAP_S390_PSW:
 370         case KVM_CAP_S390_GMAP:
 371         case KVM_CAP_SYNC_MMU:
 372 #ifdef CONFIG_KVM_S390_UCONTROL
 373         case KVM_CAP_S390_UCONTROL:
 374 #endif
 375         case KVM_CAP_ASYNC_PF:
 376         case KVM_CAP_SYNC_REGS:
 377         case KVM_CAP_ONE_REG:
 378         case KVM_CAP_ENABLE_CAP:
 379         case KVM_CAP_S390_CSS_SUPPORT:
 380         case KVM_CAP_IOEVENTFD:
 381         case KVM_CAP_DEVICE_CTRL:
 382         case KVM_CAP_ENABLE_CAP_VM:
 383         case KVM_CAP_S390_IRQCHIP:
 384         case KVM_CAP_VM_ATTRIBUTES:
 385         case KVM_CAP_MP_STATE:
 386         case KVM_CAP_IMMEDIATE_EXIT:
 387         case KVM_CAP_S390_INJECT_IRQ:
 388         case KVM_CAP_S390_USER_SIGP:
 389         case KVM_CAP_S390_USER_STSI:
 390         case KVM_CAP_S390_SKEYS:
 391         case KVM_CAP_S390_IRQ_STATE:
 392         case KVM_CAP_S390_USER_INSTR0:
 393         case KVM_CAP_S390_CMMA_MIGRATION:
 394         case KVM_CAP_S390_AIS:
 395         case KVM_CAP_S390_AIS_MIGRATION:
 396                 r = 1;
 397                 break;
 398         case KVM_CAP_S390_MEM_OP:
 399                 r = MEM_OP_MAX_SIZE;
 400                 break;
 401         case KVM_CAP_NR_VCPUS:
 402         case KVM_CAP_MAX_VCPUS:
 403                 r = KVM_S390_BSCA_CPU_SLOTS;
 404                 if (!kvm_s390_use_sca_entries())
 405                         r = KVM_MAX_VCPUS;
 406                 else if (sclp.has_esca && sclp.has_64bscao)
 407                         r = KVM_S390_ESCA_CPU_SLOTS;
 408                 break;
 409         case KVM_CAP_NR_MEMSLOTS:
 410                 r = KVM_USER_MEM_SLOTS;
 411                 break;
 412         case KVM_CAP_S390_COW:
 413                 r = MACHINE_HAS_ESOP;
 414                 break;
 415         case KVM_CAP_S390_VECTOR_REGISTERS:
 416                 r = MACHINE_HAS_VX;
 417                 break;
 418         case KVM_CAP_S390_RI:
 419                 r = test_facility(64);
 420                 break;
 421         case KVM_CAP_S390_GS:
 422                 r = test_facility(133);
 423                 break;
 424         case KVM_CAP_S390_BPB:
 425                 r = test_facility(82);
 426                 break;
 427         default:
 428                 r = 0;
 429         }
 430         return r;
 431 }
 432
 433 static void kvm_s390_sync_dirty_log(struct kvm *kvm,
 434                                         struct kvm_memory_slot *memslot)
 435 {
 436         gfn_t cur_gfn, last_gfn;
 437         unsigned long address;
 438         struct gmap *gmap = kvm->arch.gmap;
 439
 440         /* Loop over all guest pages */
 441         last_gfn = memslot->base_gfn + memslot->npages;
 442         for (cur_gfn = memslot->base_gfn; cur_gfn <= last_gfn; cur_gfn++) {
 443                 address = gfn_to_hva_memslot(memslot, cur_gfn);
 444
 445                 if (test_and_clear_guest_dirty(gmap->mm, address))
 446                         mark_page_dirty(kvm, cur_gfn);
 447                 if (fatal_signal_pending(current))
 448                         return;
 449                 cond_resched();
 450         }
 451 }
 452
 453 /* Section: vm related */
 454 static void sca_del_vcpu(struct kvm_vcpu *vcpu);
 455
 456 /*
 457  * Get (and clear) the dirty memory log for a memory slot.
 458  */
 459 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 460                                struct kvm_dirty_log *log)
 461 {
 462         int r;
 463         unsigned long n;
 464         struct kvm_memslots *slots;
 465         struct kvm_memory_slot *memslot;
 466         int is_dirty = 0;
 467
 468         if (kvm_is_ucontrol(kvm))
 469                 return -EINVAL;
 470
 471         mutex_lock(&kvm->slots_lock);
 472
 473         r = -EINVAL;
 474         if (log->slot >= KVM_USER_MEM_SLOTS)
 475                 goto out;
 476
 477         slots = kvm_memslots(kvm);
 478         memslot = id_to_memslot(slots, log->slot);
 479         r = -ENOENT;
 480         if (!memslot->dirty_bitmap)
 481                 goto out;
 482
 483         kvm_s390_sync_dirty_log(kvm, memslot);
 484         r = kvm_get_dirty_log(kvm, log, &is_dirty);
 485         if (r)
 486                 goto out;
 487
 488         /* Clear the dirty log */
 489         if (is_dirty) {
 490                 n = kvm_dirty_bitmap_bytes(memslot);
 491                 memset(memslot->dirty_bitmap, 0, n);
 492         }
 493         r = 0;
 494 out:
 495         mutex_unlock(&kvm->slots_lock);
 496         return r;
 497 }
 498
 499 static void icpt_operexc_on_all_vcpus(struct kvm *kvm)
 500 {
 501         unsigned int i;
 502         struct kvm_vcpu *vcpu;
 503
 504         kvm_for_each_vcpu(i, vcpu, kvm) {
 505                 kvm_s390_sync_request(KVM_REQ_ICPT_OPEREXC, vcpu);
 506         }
 507 }
 508
 509 static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
 510 {
 511         int r;
 512
 513         if (cap->flags)
 514                 return -EINVAL;
 515
 516         switch (cap->cap) {
 517         case KVM_CAP_S390_IRQCHIP:
 518                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP");
 519                 kvm->arch.use_irqchip = 1;
 520                 r = 0;
 521                 break;
 522         case KVM_CAP_S390_USER_SIGP:
 523                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP");
 524                 kvm->arch.user_sigp = 1;
 525                 r = 0;
 526                 break;
 527         case KVM_CAP_S390_VECTOR_REGISTERS:
 528                 mutex_lock(&kvm->lock);
 529                 if (kvm->created_vcpus) {
 530                         r = -EBUSY;
 531                 } else if (MACHINE_HAS_VX) {
 532                         set_kvm_facility(kvm->arch.model.fac_mask, 129);
 533                         set_kvm_facility(kvm->arch.model.fac_list, 129);
 534                         if (test_facility(134)) {
 535                                 set_kvm_facility(kvm->arch.model.fac_mask, 134);
 536                                 set_kvm_facility(kvm->arch.model.fac_list, 134);
 537                         }
 538                         if (test_facility(135)) {
 539                                 set_kvm_facility(kvm->arch.model.fac_mask, 135);
 540                                 set_kvm_facility(kvm->arch.model.fac_list, 135);
 541                         }
 542                         r = 0;
 543                 } else
 544                         r = -EINVAL;
 545                 mutex_unlock(&kvm->lock);
 546                 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s",
 547                          r ? "(not available)" : "(success)");
 548                 break;
 549         case KVM_CAP_S390_RI:
 550                 r = -EINVAL;
 551                 mutex_lock(&kvm->lock);
 552                 if (kvm->created_vcpus) {
 553                         r = -EBUSY;
 554                 } else if (test_facility(64)) {
 555                         set_kvm_facility(kvm->arch.model.fac_mask, 64);
 556                         set_kvm_facility(kvm->arch.model.fac_list, 64);
 557                         r = 0;
 558                 }
 559                 mutex_unlock(&kvm->lock);
 560                 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s",
 561                          r ? "(not available)" : "(success)");
 562                 break;
 563         case KVM_CAP_S390_AIS:
 564                 mutex_lock(&kvm->lock);
 565                 if (kvm->created_vcpus) {
 566                         r = -EBUSY;
 567                 } else {
 568                         set_kvm_facility(kvm->arch.model.fac_mask, 72);
 569                         set_kvm_facility(kvm->arch.model.fac_list, 72);
 570                         r = 0;
 571                 }
 572                 mutex_unlock(&kvm->lock);
 573                 VM_EVENT(kvm, 3, "ENABLE: AIS %s",
 574                          r ? "(not available)" : "(success)");
 575                 break;
 576         case KVM_CAP_S390_GS:
 577                 r = -EINVAL;
 578                 mutex_lock(&kvm->lock);
 579                 if (atomic_read(&kvm->online_vcpus)) {
 580                         r = -EBUSY;
 581                 } else if (test_facility(133)) {
 582                         set_kvm_facility(kvm->arch.model.fac_mask, 133);
 583                         set_kvm_facility(kvm->arch.model.fac_list, 133);
 584                         r = 0;
 585                 }
 586                 mutex_unlock(&kvm->lock);
 587                 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_GS %s",
 588                          r ? "(not available)" : "(success)");
 589                 break;
 590         case KVM_CAP_S390_USER_STSI:
 591                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI");
 592                 kvm->arch.user_stsi = 1;
 593                 r = 0;
 594                 break;
 595         case KVM_CAP_S390_USER_INSTR0:
 596                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_INSTR0");
 597                 kvm->arch.user_instr0 = 1;
 598                 icpt_operexc_on_all_vcpus(kvm);
 599                 r = 0;
 600                 break;
 601         default:
 602                 r = -EINVAL;
 603                 break;
 604         }
 605         return r;
 606 }
 607
 608 static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
 609 {
 610         int ret;
 611
 612         switch (attr->attr) {
 613         case KVM_S390_VM_MEM_LIMIT_SIZE:
 614                 ret = 0;
 615                 VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes",
 616                          kvm->arch.mem_limit);
 617                 if (put_user(kvm->arch.mem_limit, (u64 __user *)attr->addr))
 618                         ret = -EFAULT;
 619                 break;
 620         default:
 621                 ret = -ENXIO;
 622                 break;
 623         }
 624         return ret;
 625 }
 626
 627 static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
 628 {
 629         int ret;
 630         unsigned int idx;
 631         switch (attr->attr) {
 632         case KVM_S390_VM_MEM_ENABLE_CMMA:
 633                 ret = -ENXIO;
 634                 if (!sclp.has_cmma)
 635                         break;
 636
 637                 ret = -EBUSY;
 638                 VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support");
 639                 mutex_lock(&kvm->lock);
 640                 if (!kvm->created_vcpus) {
 641                         kvm->arch.use_cmma = 1;
 642                         ret = 0;
 643                 }
 644                 mutex_unlock(&kvm->lock);
 645                 break;
 646         case KVM_S390_VM_MEM_CLR_CMMA:
 647                 ret = -ENXIO;
 648                 if (!sclp.has_cmma)
 649                         break;
 650                 ret = -EINVAL;
 651                 if (!kvm->arch.use_cmma)
 652                         break;
 653
 654                 VM_EVENT(kvm, 3, "%s", "RESET: CMMA states");
 655                 mutex_lock(&kvm->lock);
 656                 idx = srcu_read_lock(&kvm->srcu);
 657                 s390_reset_cmma(kvm->arch.gmap->mm);
 658                 srcu_read_unlock(&kvm->srcu, idx);
 659                 mutex_unlock(&kvm->lock);
 660                 ret = 0;
 661                 break;
 662         case KVM_S390_VM_MEM_LIMIT_SIZE: {
 663                 unsigned long new_limit;
 664
 665                 if (kvm_is_ucontrol(kvm))
 666                         return -EINVAL;
 667
 668                 if (get_user(new_limit, (u64 __user *)attr->addr))
 669                         return -EFAULT;
 670
 671                 if (kvm->arch.mem_limit != KVM_S390_NO_MEM_LIMIT &&
 672                     new_limit > kvm->arch.mem_limit)
 673                         return -E2BIG;
 674
 675                 if (!new_limit)
 676                         return -EINVAL;
 677
 678                 /* gmap_create takes last usable address */
 679                 if (new_limit != KVM_S390_NO_MEM_LIMIT)
 680                         new_limit -= 1;
 681
 682                 ret = -EBUSY;
 683                 mutex_lock(&kvm->lock);
 684                 if (!kvm->created_vcpus) {
 685                         /* gmap_create will round the limit up */
 686                         struct gmap *new = gmap_create(current->mm, new_limit);
 687
 688                         if (!new) {
 689                                 ret = -ENOMEM;
 690                         } else {
 691                                 gmap_remove(kvm->arch.gmap);
 692                                 new->private = kvm;
 693                                 kvm->arch.gmap = new;
 694                                 ret = 0;
 695                         }
 696                 }
 697                 mutex_unlock(&kvm->lock);
 698                 VM_EVENT(kvm, 3, "SET: max guest address: %lu", new_limit);
 699                 VM_EVENT(kvm, 3, "New guest asce: 0x%pK",
 700                          (void *) kvm->arch.gmap->asce);
 701                 break;
 702         }
 703         default:
 704                 ret = -ENXIO;
 705                 break;
 706         }
 707         return ret;
 708 }
 709
 710 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu);
 711
 712 static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
 713 {
 714         struct kvm_vcpu *vcpu;
 715         int i;
 716
 717         if (!test_kvm_facility(kvm, 76))
 718                 return -EINVAL;
 719
 720         mutex_lock(&kvm->lock);
 721         switch (attr->attr) {
 722         case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
 723                 get_random_bytes(
 724                         kvm->arch.crypto.crycb->aes_wrapping_key_mask,
 725                         sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
 726                 kvm->arch.crypto.aes_kw = 1;
 727                 VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support");
 728                 break;
 729         case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
 730                 get_random_bytes(
 731                         kvm->arch.crypto.crycb->dea_wrapping_key_mask,
 732                         sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
 733                 kvm->arch.crypto.dea_kw = 1;
 734                 VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support");
 735                 break;
 736         case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
 737                 kvm->arch.crypto.aes_kw = 0;
 738                 memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0,
 739                         sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
 740                 VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support");
 741                 break;
 742         case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
 743                 kvm->arch.crypto.dea_kw = 0;
 744                 memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0,
 745                         sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
 746                 VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support");
 747                 break;
 748         default:
 749                 mutex_unlock(&kvm->lock);
 750                 return -ENXIO;
 751         }
 752
 753         kvm_for_each_vcpu(i, vcpu, kvm) {
 754                 kvm_s390_vcpu_crypto_setup(vcpu);
 755                 exit_sie(vcpu);
 756         }
 757         mutex_unlock(&kvm->lock);
 758         return 0;
 759 }
 760
 761 static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req)
 762 {
 763         int cx;
 764         struct kvm_vcpu *vcpu;
 765
 766         kvm_for_each_vcpu(cx, vcpu, kvm)
 767                 kvm_s390_sync_request(req, vcpu);
 768 }
 769
 770 /*
 771  * Must be called with kvm->srcu held to avoid races on memslots, and with
 772  * kvm->lock to avoid races with ourselves and kvm_s390_vm_stop_migration.
 773  */
 774 static int kvm_s390_vm_start_migration(struct kvm *kvm)
 775 {
 776         struct kvm_s390_migration_state *mgs;
 777         struct kvm_memory_slot *ms;
 778         /* should be the only one */
 779         struct kvm_memslots *slots;
 780         unsigned long ram_pages;
 781         int slotnr;
 782
 783         /* migration mode already enabled */
 784         if (kvm->arch.migration_state)
 785                 return 0;
 786
 787         slots = kvm_memslots(kvm);
 788         if (!slots || !slots->used_slots)
 789                 return -EINVAL;
 790
 791         mgs = kzalloc(sizeof(*mgs), GFP_KERNEL);
 792         if (!mgs)
 793                 return -ENOMEM;
 794         kvm->arch.migration_state = mgs;
 795
 796         if (kvm->arch.use_cmma) {
 797                 /*
 798                  * Get the first slot. They are reverse sorted by base_gfn, so
 799                  * the first slot is also the one at the end of the address
 800                  * space. We have verified above that at least one slot is
 801                  * present.
 802                  */
 803                 ms = slots->memslots;
 804                 /* round up so we only use full longs */
 805                 ram_pages = roundup(ms->base_gfn + ms->npages, BITS_PER_LONG);
 806                 /* allocate enough bytes to store all the bits */
 807                 mgs->pgste_bitmap = vmalloc(ram_pages / 8);
 808                 if (!mgs->pgste_bitmap) {
 809                         kfree(mgs);
 810                         kvm->arch.migration_state = NULL;
 811                         return -ENOMEM;
 812                 }
 813
 814                 mgs->bitmap_size = ram_pages;
 815                 atomic64_set(&mgs->dirty_pages, ram_pages);
 816                 /* mark all the pages in active slots as dirty */
 817                 for (slotnr = 0; slotnr < slots->used_slots; slotnr++) {
 818                         ms = slots->memslots + slotnr;
 819                         bitmap_set(mgs->pgste_bitmap, ms->base_gfn, ms->npages);
 820                 }
 821
 822                 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_START_MIGRATION);
 823         }
 824         return 0;
 825 }
 826
 827 /*
 828  * Must be called with kvm->lock to avoid races with ourselves and
 829  * kvm_s390_vm_start_migration.
 830  */
 831 static int kvm_s390_vm_stop_migration(struct kvm *kvm)
 832 {
 833         struct kvm_s390_migration_state *mgs;
 834
 835         /* migration mode already disabled */
 836         if (!kvm->arch.migration_state)
 837                 return 0;
 838         mgs = kvm->arch.migration_state;
 839         kvm->arch.migration_state = NULL;
 840
 841         if (kvm->arch.use_cmma) {
 842                 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_STOP_MIGRATION);
 843                 vfree(mgs->pgste_bitmap);
 844         }
 845         kfree(mgs);
 846         return 0;
 847 }
 848
 849 static int kvm_s390_vm_set_migration(struct kvm *kvm,
 850                                      struct kvm_device_attr *attr)
 851 {
 852         int idx, res = -ENXIO;
 853
 854         mutex_lock(&kvm->lock);
 855         switch (attr->attr) {
 856         case KVM_S390_VM_MIGRATION_START:
 857                 idx = srcu_read_lock(&kvm->srcu);
 858                 res = kvm_s390_vm_start_migration(kvm);
 859                 srcu_read_unlock(&kvm->srcu, idx);
 860                 break;
 861         case KVM_S390_VM_MIGRATION_STOP:
 862                 res = kvm_s390_vm_stop_migration(kvm);
 863                 break;
 864         default:
 865                 break;
 866         }
 867         mutex_unlock(&kvm->lock);
 868
 869         return res;
 870 }
 871
 872 static int kvm_s390_vm_get_migration(struct kvm *kvm,
 873                                      struct kvm_device_attr *attr)
 874 {
 875         u64 mig = (kvm->arch.migration_state != NULL);
 876
 877         if (attr->attr != KVM_S390_VM_MIGRATION_STATUS)
 878                 return -ENXIO;
 879
 880         if (copy_to_user((void __user *)attr->addr, &mig, sizeof(mig)))
 881                 return -EFAULT;
 882         return 0;
 883 }
 884
 885 static int kvm_s390_set_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
 886 {
 887         struct kvm_s390_vm_tod_clock gtod;
 888
 889         if (copy_from_user(&gtod, (void __user *)attr->addr, sizeof(gtod)))
 890                 return -EFAULT;
 891
 892         if (test_kvm_facility(kvm, 139))
 893                 kvm_s390_set_tod_clock_ext(kvm, &gtod);
 894         else if (gtod.epoch_idx == 0)
 895                 kvm_s390_set_tod_clock(kvm, gtod.tod);
 896         else
 897                 return -EINVAL;
 898
 899         VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x, TOD base: 0x%llx",
 900                 gtod.epoch_idx, gtod.tod);
 901
 902         return 0;
 903 }
 904
 905 static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
 906 {
 907         u8 gtod_high;
 908
 909         if (copy_from_user(&gtod_high, (void __user *)attr->addr,
 910                                            sizeof(gtod_high)))
 911                 return -EFAULT;
 912
 913         if (gtod_high != 0)
 914                 return -EINVAL;
 915         VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high);
 916
 917         return 0;
 918 }
 919
 920 static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
 921 {
 922         u64 gtod;
 923
 924         if (copy_from_user(&gtod, (void __user *)attr->addr, sizeof(gtod)))
 925                 return -EFAULT;
 926
 927         kvm_s390_set_tod_clock(kvm, gtod);
 928         VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod);
 929         return 0;
 930 }
 931
 932 static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr)
 933 {
 934         int ret;
 935
 936         if (attr->flags)
 937                 return -EINVAL;
 938
 939         switch (attr->attr) {
 940         case KVM_S390_VM_TOD_EXT:
 941                 ret = kvm_s390_set_tod_ext(kvm, attr);
 942                 break;
 943         case KVM_S390_VM_TOD_HIGH:
 944                 ret = kvm_s390_set_tod_high(kvm, attr);
 945                 break;
 946         case KVM_S390_VM_TOD_LOW:
 947                 ret = kvm_s390_set_tod_low(kvm, attr);
 948                 break;
 949         default:
 950                 ret = -ENXIO;
 951                 break;
 952         }
 953         return ret;
 954 }
 955
 956 static void kvm_s390_get_tod_clock_ext(struct kvm *kvm,
 957                                         struct kvm_s390_vm_tod_clock *gtod)
 958 {
 959         struct kvm_s390_tod_clock_ext htod;
 960
 961         preempt_disable();
 962
 963         get_tod_clock_ext((char *)&htod);
 964
 965         gtod->tod = htod.tod + kvm->arch.epoch;
 966         gtod->epoch_idx = htod.epoch_idx + kvm->arch.epdx;
 967
 968         if (gtod->tod < htod.tod)
 969                 gtod->epoch_idx += 1;
 970
 971         preempt_enable();
 972 }
 973
 974 static int kvm_s390_get_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
 975 {
 976         struct kvm_s390_vm_tod_clock gtod;
 977
 978         memset(&gtod, 0, sizeof(gtod));
 979
 980         if (test_kvm_facility(kvm, 139))
 981                 kvm_s390_get_tod_clock_ext(kvm, &gtod);
 982         else
 983                 gtod.tod = kvm_s390_get_tod_clock_fast(kvm);
 984
 985         if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
 986                 return -EFAULT;
 987
 988         VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x, TOD base: 0x%llx",
 989                 gtod.epoch_idx, gtod.tod);
 990         return 0;
 991 }
 992
 993 static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
 994 {
 995         u8 gtod_high = 0;
 996
 997         if (copy_to_user((void __user *)attr->addr, &gtod_high,
 998                                          sizeof(gtod_high)))
 999                 return -EFAULT;
1000         VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high);
1001
1002         return 0;
1003 }
1004
1005 static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
1006 {
1007         u64 gtod;
1008
1009         gtod = kvm_s390_get_tod_clock_fast(kvm);
1010         if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
1011                 return -EFAULT;
1012         VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod);
1013
1014         return 0;
1015 }
1016
1017 static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr)
1018 {
1019         int ret;
1020
1021         if (attr->flags)
1022                 return -EINVAL;
1023
1024         switch (attr->attr) {
1025         case KVM_S390_VM_TOD_EXT:
1026                 ret = kvm_s390_get_tod_ext(kvm, attr);
1027                 break;
1028         case KVM_S390_VM_TOD_HIGH:
1029                 ret = kvm_s390_get_tod_high(kvm, attr);
1030                 break;
1031         case KVM_S390_VM_TOD_LOW:
1032                 ret = kvm_s390_get_tod_low(kvm, attr);
1033                 break;
1034         default:
1035                 ret = -ENXIO;
1036                 break;
1037         }
1038         return ret;
1039 }
1040
1041 static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr)
1042 {
1043         struct kvm_s390_vm_cpu_processor *proc;
1044         u16 lowest_ibc, unblocked_ibc;
1045         int ret = 0;
1046
1047         mutex_lock(&kvm->lock);
1048         if (kvm->created_vcpus) {
1049                 ret = -EBUSY;
1050                 goto out;
1051         }
1052         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
1053         if (!proc) {
1054                 ret = -ENOMEM;
1055                 goto out;
1056         }
1057         if (!copy_from_user(proc, (void __user *)attr->addr,
1058                             sizeof(*proc))) {
1059                 kvm->arch.model.cpuid = proc->cpuid;
1060                 lowest_ibc = sclp.ibc >> 16 & 0xfff;
1061                 unblocked_ibc = sclp.ibc & 0xfff;
1062                 if (lowest_ibc && proc->ibc) {
1063                         if (proc->ibc > unblocked_ibc)
1064                                 kvm->arch.model.ibc = unblocked_ibc;
1065                         else if (proc->ibc < lowest_ibc)
1066                                 kvm->arch.model.ibc = lowest_ibc;
1067                         else
1068                                 kvm->arch.model.ibc = proc->ibc;
1069                 }
1070                 memcpy(kvm->arch.model.fac_list, proc->fac_list,
1071                        S390_ARCH_FAC_LIST_SIZE_BYTE);
1072                 VM_EVENT(kvm, 3, "SET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
1073                          kvm->arch.model.ibc,
1074                          kvm->arch.model.cpuid);
1075                 VM_EVENT(kvm, 3, "SET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
1076                          kvm->arch.model.fac_list[0],
1077                          kvm->arch.model.fac_list[1],
1078                          kvm->arch.model.fac_list[2]);
1079         } else
1080                 ret = -EFAULT;
1081         kfree(proc);
1082 out:
1083         mutex_unlock(&kvm->lock);
1084         return ret;
1085 }
1086
1087 static int kvm_s390_set_processor_feat(struct kvm *kvm,
1088                                        struct kvm_device_attr *attr)
1089 {
1090         struct kvm_s390_vm_cpu_feat data;
1091         int ret = -EBUSY;
1092
1093         if (copy_from_user(&data, (void __user *)attr->addr, sizeof(data)))
1094                 return -EFAULT;
1095         if (!bitmap_subset((unsigned long *) data.feat,
1096                            kvm_s390_available_cpu_feat,
1097                            KVM_S390_VM_CPU_FEAT_NR_BITS))
1098                 return -EINVAL;
1099
1100         mutex_lock(&kvm->lock);
1101         if (!atomic_read(&kvm->online_vcpus)) {
1102                 bitmap_copy(kvm->arch.cpu_feat, (unsigned long *) data.feat,
1103                             KVM_S390_VM_CPU_FEAT_NR_BITS);
1104                 ret = 0;
1105         }
1106         mutex_unlock(&kvm->lock);
1107         return ret;
1108 }
1109
1110 static int kvm_s390_set_processor_subfunc(struct kvm *kvm,
1111                                           struct kvm_device_attr *attr)
1112 {
1113         /*
1114          * Once supported by kernel + hw, we have to store the subfunctions
1115          * in kvm->arch and remember that user space configured them.
1116          */
1117         return -ENXIO;
1118 }
1119
1120 static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
1121 {
1122         int ret = -ENXIO;
1123
1124         switch (attr->attr) {
1125         case KVM_S390_VM_CPU_PROCESSOR:
1126                 ret = kvm_s390_set_processor(kvm, attr);
1127                 break;
1128         case KVM_S390_VM_CPU_PROCESSOR_FEAT:
1129                 ret = kvm_s390_set_processor_feat(kvm, attr);
1130                 break;
1131         case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1132                 ret = kvm_s390_set_processor_subfunc(kvm, attr);
1133                 break;
1134         }
1135         return ret;
1136 }
1137
1138 static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr)
1139 {
1140         struct kvm_s390_vm_cpu_processor *proc;
1141         int ret = 0;
1142
1143         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
1144         if (!proc) {
1145                 ret = -ENOMEM;
1146                 goto out;
1147         }
1148         proc->cpuid = kvm->arch.model.cpuid;
1149         proc->ibc = kvm->arch.model.ibc;
1150         memcpy(&proc->fac_list, kvm->arch.model.fac_list,
1151                S390_ARCH_FAC_LIST_SIZE_BYTE);
1152         VM_EVENT(kvm, 3, "GET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
1153                  kvm->arch.model.ibc,
1154                  kvm->arch.model.cpuid);
1155         VM_EVENT(kvm, 3, "GET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
1156                  kvm->arch.model.fac_list[0],
1157                  kvm->arch.model.fac_list[1],
1158                  kvm->arch.model.fac_list[2]);
1159         if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc)))
1160                 ret = -EFAULT;
1161         kfree(proc);
1162 out:
1163         return ret;
1164 }
1165
1166 static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr)
1167 {
1168         struct kvm_s390_vm_cpu_machine *mach;
1169         int ret = 0;
1170
1171         mach = kzalloc(sizeof(*mach), GFP_KERNEL);
1172         if (!mach) {
1173                 ret = -ENOMEM;
1174                 goto out;
1175         }
1176         get_cpu_id((struct cpuid *) &mach->cpuid);
1177         mach->ibc = sclp.ibc;
1178         memcpy(&mach->fac_mask, kvm->arch.model.fac_mask,
1179                S390_ARCH_FAC_LIST_SIZE_BYTE);
1180         memcpy((unsigned long *)&mach->fac_list, S390_lowcore.stfle_fac_list,
1181                sizeof(S390_lowcore.stfle_fac_list));
1182         VM_EVENT(kvm, 3, "GET: host ibc:  0x%4.4x, host cpuid:  0x%16.16llx",
1183                  kvm->arch.model.ibc,
1184                  kvm->arch.model.cpuid);
1185         VM_EVENT(kvm, 3, "GET: host facmask:  0x%16.16llx.%16.16llx.%16.16llx",
1186                  mach->fac_mask[0],
1187                  mach->fac_mask[1],
1188                  mach->fac_mask[2]);
1189         VM_EVENT(kvm, 3, "GET: host faclist:  0x%16.16llx.%16.16llx.%16.16llx",
1190                  mach->fac_list[0],
1191                  mach->fac_list[1],
1192                  mach->fac_list[2]);
1193         if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach)))
1194                 ret = -EFAULT;
1195         kfree(mach);
1196 out:
1197         return ret;
1198 }
1199
1200 static int kvm_s390_get_processor_feat(struct kvm *kvm,
1201                                        struct kvm_device_attr *attr)
1202 {
1203         struct kvm_s390_vm_cpu_feat data;
1204
1205         bitmap_copy((unsigned long *) data.feat, kvm->arch.cpu_feat,
1206                     KVM_S390_VM_CPU_FEAT_NR_BITS);
1207         if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
1208                 return -EFAULT;
1209         return 0;
1210 }
1211
1212 static int kvm_s390_get_machine_feat(struct kvm *kvm,
1213                                      struct kvm_device_attr *attr)
1214 {
1215         struct kvm_s390_vm_cpu_feat data;
1216
1217         bitmap_copy((unsigned long *) data.feat,
1218                     kvm_s390_available_cpu_feat,
1219                     KVM_S390_VM_CPU_FEAT_NR_BITS);
1220         if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
1221                 return -EFAULT;
1222         return 0;
1223 }
1224
1225 static int kvm_s390_get_processor_subfunc(struct kvm *kvm,
1226                                           struct kvm_device_attr *attr)
1227 {
1228         /*
1229          * Once we can actually configure subfunctions (kernel + hw support),
1230          * we have to check if they were already set by user space, if so copy
1231          * them from kvm->arch.
1232          */
1233         return -ENXIO;
1234 }
1235
1236 static int kvm_s390_get_machine_subfunc(struct kvm *kvm,
1237                                         struct kvm_device_attr *attr)
1238 {
1239         if (copy_to_user((void __user *)attr->addr, &kvm_s390_available_subfunc,
1240             sizeof(struct kvm_s390_vm_cpu_subfunc)))
1241                 return -EFAULT;
1242         return 0;
1243 }
1244 static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
1245 {
1246         int ret = -ENXIO;
1247
1248         switch (attr->attr) {
1249         case KVM_S390_VM_CPU_PROCESSOR:
1250                 ret = kvm_s390_get_processor(kvm, attr);
1251                 break;
1252         case KVM_S390_VM_CPU_MACHINE:
1253                 ret = kvm_s390_get_machine(kvm, attr);
1254                 break;
1255         case KVM_S390_VM_CPU_PROCESSOR_FEAT:
1256                 ret = kvm_s390_get_processor_feat(kvm, attr);
1257                 break;
1258         case KVM_S390_VM_CPU_MACHINE_FEAT:
1259                 ret = kvm_s390_get_machine_feat(kvm, attr);
1260                 break;
1261         case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1262                 ret = kvm_s390_get_processor_subfunc(kvm, attr);
1263                 break;
1264         case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
1265                 ret = kvm_s390_get_machine_subfunc(kvm, attr);
1266                 break;
1267         }
1268         return ret;
1269 }
1270
1271 static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1272 {
1273         int ret;
1274
1275         switch (attr->group) {
1276         case KVM_S390_VM_MEM_CTRL:
1277                 ret = kvm_s390_set_mem_control(kvm, attr);
1278                 break;
1279         case KVM_S390_VM_TOD:
1280                 ret = kvm_s390_set_tod(kvm, attr);
1281                 break;
1282         case KVM_S390_VM_CPU_MODEL:
1283                 ret = kvm_s390_set_cpu_model(kvm, attr);
1284                 break;
1285         case KVM_S390_VM_CRYPTO:
1286                 ret = kvm_s390_vm_set_crypto(kvm, attr);
1287                 break;
1288         case KVM_S390_VM_MIGRATION:
1289                 ret = kvm_s390_vm_set_migration(kvm, attr);
1290                 break;
1291         default:
1292                 ret = -ENXIO;
1293                 break;
1294         }
1295
1296         return ret;
1297 }
1298
1299 static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1300 {
1301         int ret;
1302
1303         switch (attr->group) {
1304         case KVM_S390_VM_MEM_CTRL:
1305                 ret = kvm_s390_get_mem_control(kvm, attr);
1306                 break;
1307         case KVM_S390_VM_TOD:
1308                 ret = kvm_s390_get_tod(kvm, attr);
1309                 break;
1310         case KVM_S390_VM_CPU_MODEL:
1311                 ret = kvm_s390_get_cpu_model(kvm, attr);
1312                 break;
1313         case KVM_S390_VM_MIGRATION:
1314                 ret = kvm_s390_vm_get_migration(kvm, attr);
1315                 break;
1316         default:
1317                 ret = -ENXIO;
1318                 break;
1319         }
1320
1321         return ret;
1322 }
1323
1324 static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1325 {
1326         int ret;
1327
1328         switch (attr->group) {
1329         case KVM_S390_VM_MEM_CTRL:
1330                 switch (attr->attr) {
1331                 case KVM_S390_VM_MEM_ENABLE_CMMA:
1332                 case KVM_S390_VM_MEM_CLR_CMMA:
1333                         ret = sclp.has_cmma ? 0 : -ENXIO;
1334                         break;
1335                 case KVM_S390_VM_MEM_LIMIT_SIZE:
1336                         ret = 0;
1337                         break;
1338                 default:
1339                         ret = -ENXIO;
1340                         break;
1341                 }
1342                 break;
1343         case KVM_S390_VM_TOD:
1344                 switch (attr->attr) {
1345                 case KVM_S390_VM_TOD_LOW:
1346                 case KVM_S390_VM_TOD_HIGH:
1347                         ret = 0;
1348                         break;
1349                 default:
1350                         ret = -ENXIO;
1351                         break;
1352                 }
1353                 break;
1354         case KVM_S390_VM_CPU_MODEL:
1355                 switch (attr->attr) {
1356                 case KVM_S390_VM_CPU_PROCESSOR:
1357                 case KVM_S390_VM_CPU_MACHINE:
1358                 case KVM_S390_VM_CPU_PROCESSOR_FEAT:
1359                 case KVM_S390_VM_CPU_MACHINE_FEAT:
1360                 case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
1361                         ret = 0;
1362                         break;
1363                 /* configuring subfunctions is not supported yet */
1364                 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1365                 default:
1366                         ret = -ENXIO;
1367                         break;
1368                 }
1369                 break;
1370         case KVM_S390_VM_CRYPTO:
1371                 switch (attr->attr) {
1372                 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
1373                 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
1374                 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
1375                 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
1376                         ret = 0;
1377                         break;
1378                 default:
1379                         ret = -ENXIO;
1380                         break;
1381                 }
1382                 break;
1383         case KVM_S390_VM_MIGRATION:
1384                 ret = 0;
1385                 break;
1386         default:
1387                 ret = -ENXIO;
1388                 break;
1389         }
1390
1391         return ret;
1392 }
1393
1394 static long kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
1395 {
1396         uint8_t *keys;
1397         uint64_t hva;
1398         int srcu_idx, i, r = 0;
1399
1400         if (args->flags != 0)
1401                 return -EINVAL;
1402
1403         /* Is this guest using storage keys? */
1404         if (!mm_use_skey(current->mm))
1405                 return KVM_S390_GET_SKEYS_NONE;
1406
1407         /* Enforce sane limit on memory allocation */
1408         if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
1409                 return -EINVAL;
1410
1411         keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL);
1412         if (!keys)
1413                 return -ENOMEM;
1414
1415         down_read(&current->mm->mmap_sem);
1416         srcu_idx = srcu_read_lock(&kvm->srcu);
1417         for (i = 0; i < args->count; i++) {
1418                 hva = gfn_to_hva(kvm, args->start_gfn + i);
1419                 if (kvm_is_error_hva(hva)) {
1420                         r = -EFAULT;
1421                         break;
1422                 }
1423
1424                 r = get_guest_storage_key(current->mm, hva, &keys[i]);
1425                 if (r)
1426                         break;
1427         }
1428         srcu_read_unlock(&kvm->srcu, srcu_idx);
1429         up_read(&current->mm->mmap_sem);
1430
1431         if (!r) {
1432                 r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys,
1433                                  sizeof(uint8_t) * args->count);
1434                 if (r)
1435                         r = -EFAULT;
1436         }
1437
1438         kvfree(keys);
1439         return r;
1440 }
1441
1442 static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
1443 {
1444         uint8_t *keys;
1445         uint64_t hva;
1446         int srcu_idx, i, r = 0;
1447
1448         if (args->flags != 0)
1449                 return -EINVAL;
1450
1451         /* Enforce sane limit on memory allocation */
1452         if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
1453                 return -EINVAL;
1454
1455         keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL);
1456         if (!keys)
1457                 return -ENOMEM;
1458
1459         r = copy_from_user(keys, (uint8_t __user *)args->skeydata_addr,
1460                            sizeof(uint8_t) * args->count);
1461         if (r) {
1462                 r = -EFAULT;
1463                 goto out;
1464         }
1465
1466         /* Enable storage key handling for the guest */
1467         r = s390_enable_skey();
1468         if (r)
1469                 goto out;
1470
1471         down_read(&current->mm->mmap_sem);
1472         srcu_idx = srcu_read_lock(&kvm->srcu);
1473         for (i = 0; i < args->count; i++) {
1474                 hva = gfn_to_hva(kvm, args->start_gfn + i);
1475                 if (kvm_is_error_hva(hva)) {
1476                         r = -EFAULT;
1477                         break;
1478                 }
1479
1480                 /* Lowest order bit is reserved */
1481                 if (keys[i] & 0x01) {
1482                         r = -EINVAL;
1483                         break;
1484                 }
1485
1486                 r = set_guest_storage_key(current->mm, hva, keys[i], 0);
1487                 if (r)
1488                         break;
1489         }
1490         srcu_read_unlock(&kvm->srcu, srcu_idx);
1491         up_read(&current->mm->mmap_sem);
1492 out:
1493         kvfree(keys);
1494         return r;
1495 }
1496
1497 /*
1498  * Base address and length must be sent at the start of each block, therefore
1499  * it's cheaper to send some clean data, as long as it's less than the size of
1500  * two longs.
1501  */
1502 #define KVM_S390_MAX_BIT_DISTANCE (2 * sizeof(void *))
1503 /* for consistency */
1504 #define KVM_S390_CMMA_SIZE_MAX ((u32)KVM_S390_SKEYS_MAX)
1505
1506 /*
1507  * This function searches for the next page with dirty CMMA attributes, and
1508  * saves the attributes in the buffer up to either the end of the buffer or
1509  * until a block of at least KVM_S390_MAX_BIT_DISTANCE clean bits is found;
1510  * no trailing clean bytes are saved.
1511  * In case no dirty bits were found, or if CMMA was not enabled or used, the
1512  * output buffer will indicate 0 as length.
1513  */
1514 static int kvm_s390_get_cmma_bits(struct kvm *kvm,
1515                                   struct kvm_s390_cmma_log *args)
1516 {
1517         struct kvm_s390_migration_state *s = kvm->arch.migration_state;
1518         unsigned long bufsize, hva, pgstev, i, next, cur;
1519         int srcu_idx, peek, r = 0, rr;
1520         u8 *res;
1521
1522         cur = args->start_gfn;
1523         i = next = pgstev = 0;
1524
1525         if (unlikely(!kvm->arch.use_cmma))
1526                 return -ENXIO;
1527         /* Invalid/unsupported flags were specified */
1528         if (args->flags & ~KVM_S390_CMMA_PEEK)
1529                 return -EINVAL;
1530         /* Migration mode query, and we are not doing a migration */
1531         peek = !!(args->flags & KVM_S390_CMMA_PEEK);
1532         if (!peek && !s)
1533                 return -EINVAL;
1534         /* CMMA is disabled or was not used, or the buffer has length zero */
1535         bufsize = min(args->count, KVM_S390_CMMA_SIZE_MAX);
1536         if (!bufsize || !kvm->mm->context.use_cmma) {
1537                 memset(args, 0, sizeof(*args));
1538                 return 0;
1539         }
1540
1541         if (!peek) {
1542                 /* We are not peeking, and there are no dirty pages */
1543                 if (!atomic64_read(&s->dirty_pages)) {
1544                         memset(args, 0, sizeof(*args));
1545                         return 0;
1546                 }
1547                 cur = find_next_bit(s->pgste_bitmap, s->bitmap_size,
1548                                     args->start_gfn);
1549                 if (cur >= s->bitmap_size)      /* nothing found, loop back */
1550                         cur = find_next_bit(s->pgste_bitmap, s->bitmap_size, 0);
1551                 if (cur >= s->bitmap_size) {    /* again! (very unlikely) */
1552                         memset(args, 0, sizeof(*args));
1553                         return 0;
1554                 }
1555                 next = find_next_bit(s->pgste_bitmap, s->bitmap_size, cur + 1);
1556         }
1557
1558         res = vmalloc(bufsize);
1559         if (!res)
1560                 return -ENOMEM;
1561
1562         args->start_gfn = cur;
1563
1564         down_read(&kvm->mm->mmap_sem);
1565         srcu_idx = srcu_read_lock(&kvm->srcu);
1566         while (i < bufsize) {
1567                 hva = gfn_to_hva(kvm, cur);
1568                 if (kvm_is_error_hva(hva)) {
1569                         r = -EFAULT;
1570                         break;
1571                 }
1572                 /* decrement only if we actually flipped the bit to 0 */
1573                 if (!peek && test_and_clear_bit(cur, s->pgste_bitmap))
1574                         atomic64_dec(&s->dirty_pages);
1575                 r = get_pgste(kvm->mm, hva, &pgstev);
1576                 if (r < 0)
1577                         pgstev = 0;
1578                 /* save the value */
1579                 res[i++] = (pgstev >> 24) & 0x43;
1580                 /*
1581                  * if the next bit is too far away, stop.
1582                  * if we reached the previous "next", find the next one
1583                  */
1584                 if (!peek) {
1585                         if (next > cur + KVM_S390_MAX_BIT_DISTANCE)
1586                                 break;
1587                         if (cur == next)
1588                                 next = find_next_bit(s->pgste_bitmap,
1589                                                      s->bitmap_size, cur + 1);
1590                 /* reached the end of the bitmap or of the buffer, stop */
1591                         if ((next >= s->bitmap_size) ||
1592                             (next >= args->start_gfn + bufsize))
1593                                 break;
1594                 }
1595                 cur++;
1596         }
1597         srcu_read_unlock(&kvm->srcu, srcu_idx);
1598         up_read(&kvm->mm->mmap_sem);
1599         args->count = i;
1600         args->remaining = s ? atomic64_read(&s->dirty_pages) : 0;
1601
1602         rr = copy_to_user((void __user *)args->values, res, args->count);
1603         if (rr)
1604                 r = -EFAULT;
1605
1606         vfree(res);
1607         return r;
1608 }
1609
1610 /*
1611  * This function sets the CMMA attributes for the given pages. If the input
1612  * buffer has zero length, no action is taken, otherwise the attributes are
1613  * set and the mm->context.use_cmma flag is set.
1614  */
1615 static int kvm_s390_set_cmma_bits(struct kvm *kvm,
1616                                   const struct kvm_s390_cmma_log *args)
1617 {
1618         unsigned long hva, mask, pgstev, i;
1619         uint8_t *bits;
1620         int srcu_idx, r = 0;
1621
1622         mask = args->mask;
1623
1624         if (!kvm->arch.use_cmma)
1625                 return -ENXIO;
1626         /* invalid/unsupported flags */
1627         if (args->flags != 0)
1628                 return -EINVAL;
1629         /* Enforce sane limit on memory allocation */
1630         if (args->count > KVM_S390_CMMA_SIZE_MAX)
1631                 return -EINVAL;
1632         /* Nothing to do */
1633         if (args->count == 0)
1634                 return 0;
1635
1636         bits = vmalloc(sizeof(*bits) * args->count);
1637         if (!bits)
1638                 return -ENOMEM;
1639
1640         r = copy_from_user(bits, (void __user *)args->values, args->count);
1641         if (r) {
1642                 r = -EFAULT;
1643                 goto out;
1644         }
1645
1646         down_read(&kvm->mm->mmap_sem);
1647         srcu_idx = srcu_read_lock(&kvm->srcu);
1648         for (i = 0; i < args->count; i++) {
1649                 hva = gfn_to_hva(kvm, args->start_gfn + i);
1650                 if (kvm_is_error_hva(hva)) {
1651                         r = -EFAULT;
1652                         break;
1653                 }
1654
1655                 pgstev = bits[i];
1656                 pgstev = pgstev << 24;
1657                 mask &= _PGSTE_GPS_USAGE_MASK | _PGSTE_GPS_NODAT;
1658                 set_pgste_bits(kvm->mm, hva, mask, pgstev);
1659         }
1660         srcu_read_unlock(&kvm->srcu, srcu_idx);
1661         up_read(&kvm->mm->mmap_sem);
1662
1663         if (!kvm->mm->context.use_cmma) {
1664                 down_write(&kvm->mm->mmap_sem);
1665                 kvm->mm->context.use_cmma = 1;
1666                 up_write(&kvm->mm->mmap_sem);
1667         }
1668 out:
1669         vfree(bits);
1670         return r;
1671 }
1672
1673 long kvm_arch_vm_ioctl(struct file *filp,
1674                        unsigned int ioctl, unsigned long arg)
1675 {
1676         struct kvm *kvm = filp->private_data;
1677         void __user *argp = (void __user *)arg;
1678         struct kvm_device_attr attr;
1679         int r;
1680
1681         switch (ioctl) {
1682         case KVM_S390_INTERRUPT: {
1683                 struct kvm_s390_interrupt s390int;
1684
1685                 r = -EFAULT;
1686                 if (copy_from_user(&s390int, argp, sizeof(s390int)))
1687                         break;
1688                 r = kvm_s390_inject_vm(kvm, &s390int);
1689                 break;
1690         }
1691         case KVM_ENABLE_CAP: {
1692                 struct kvm_enable_cap cap;
1693                 r = -EFAULT;
1694                 if (copy_from_user(&cap, argp, sizeof(cap)))
1695                         break;
1696                 r = kvm_vm_ioctl_enable_cap(kvm, &cap);
1697                 break;
1698         }
1699         case KVM_CREATE_IRQCHIP: {
1700                 struct kvm_irq_routing_entry routing;
1701
1702                 r = -EINVAL;
1703                 if (kvm->arch.use_irqchip) {
1704                         /* Set up dummy routing. */
1705                         memset(&routing, 0, sizeof(routing));
1706                         r = kvm_set_irq_routing(kvm, &routing, 0, 0);
1707                 }
1708                 break;
1709         }
1710         case KVM_SET_DEVICE_ATTR: {
1711                 r = -EFAULT;
1712                 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
1713                         break;
1714                 r = kvm_s390_vm_set_attr(kvm, &attr);
1715                 break;
1716         }
1717         case KVM_GET_DEVICE_ATTR: {
1718                 r = -EFAULT;
1719                 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
1720                         break;
1721                 r = kvm_s390_vm_get_attr(kvm, &attr);
1722                 break;
1723         }
1724         case KVM_HAS_DEVICE_ATTR: {
1725                 r = -EFAULT;
1726                 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
1727                         break;
1728                 r = kvm_s390_vm_has_attr(kvm, &attr);
1729                 break;
1730         }
1731         case KVM_S390_GET_SKEYS: {
1732                 struct kvm_s390_skeys args;
1733
1734                 r = -EFAULT;
1735                 if (copy_from_user(&args, argp,
1736                                    sizeof(struct kvm_s390_skeys)))
1737                         break;
1738                 r = kvm_s390_get_skeys(kvm, &args);
1739                 break;
1740         }
1741         case KVM_S390_SET_SKEYS: {
1742                 struct kvm_s390_skeys args;
1743
1744                 r = -EFAULT;
1745                 if (copy_from_user(&args, argp,
1746                                    sizeof(struct kvm_s390_skeys)))
1747                         break;
1748                 r = kvm_s390_set_skeys(kvm, &args);
1749                 break;
1750         }
1751         case KVM_S390_GET_CMMA_BITS: {
1752                 struct kvm_s390_cmma_log args;
1753
1754                 r = -EFAULT;
1755                 if (copy_from_user(&args, argp, sizeof(args)))
1756                         break;
1757                 r = kvm_s390_get_cmma_bits(kvm, &args);
1758                 if (!r) {
1759                         r = copy_to_user(argp, &args, sizeof(args));
1760                         if (r)
1761                                 r = -EFAULT;
1762                 }
1763                 break;
1764         }
1765         case KVM_S390_SET_CMMA_BITS: {
1766                 struct kvm_s390_cmma_log args;
1767
1768                 r = -EFAULT;
1769                 if (copy_from_user(&args, argp, sizeof(args)))
1770                         break;
1771                 r = kvm_s390_set_cmma_bits(kvm, &args);
1772                 break;
1773         }
1774         default:
1775                 r = -ENOTTY;
1776         }
1777
1778         return r;
1779 }
1780
1781 static int kvm_s390_query_ap_config(u8 *config)
1782 {
1783         u32 fcn_code = 0x04000000UL;
1784         u32 cc = 0;
1785
1786         memset(config, 0, 128);
1787         asm volatile(
1788                 "lgr 0,%1\n"
1789                 "lgr 2,%2\n"
1790                 ".long 0xb2af0000\n"            /* PQAP(QCI) */
1791                 "0: ipm %0\n"
1792                 "srl %0,28\n"
1793                 "1:\n"
1794                 EX_TABLE(0b, 1b)
1795                 : "+r" (cc)
1796                 : "r" (fcn_code), "r" (config)
1797                 : "cc", "0", "2", "memory"
1798         );
1799
1800         return cc;
1801 }
1802
1803 static int kvm_s390_apxa_installed(void)
1804 {
1805         u8 config[128];
1806         int cc;
1807
1808         if (test_facility(12)) {
1809                 cc = kvm_s390_query_ap_config(config);
1810
1811                 if (cc)
1812                         pr_err("PQAP(QCI) failed with cc=%d", cc);
1813                 else
1814                         return config[0] & 0x40;
1815         }
1816
1817         return 0;
1818 }
1819
1820 static void kvm_s390_set_crycb_format(struct kvm *kvm)
1821 {
1822         kvm->arch.crypto.crycbd = (__u32)(unsigned long) kvm->arch.crypto.crycb;
1823
1824         if (kvm_s390_apxa_installed())
1825                 kvm->arch.crypto.crycbd |= CRYCB_FORMAT2;
1826         else
1827                 kvm->arch.crypto.crycbd |= CRYCB_FORMAT1;
1828 }
1829
1830 static u64 kvm_s390_get_initial_cpuid(void)
1831 {
1832         struct cpuid cpuid;
1833
1834         get_cpu_id(&cpuid);
1835         cpuid.version = 0xff;
1836         return *((u64 *) &cpuid);
1837 }
1838
1839 static void kvm_s390_crypto_init(struct kvm *kvm)
1840 {
1841         if (!test_kvm_facility(kvm, 76))
1842                 return;
1843
1844         kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb;
1845         kvm_s390_set_crycb_format(kvm);
1846
1847         /* Enable AES/DEA protected key functions by default */
1848         kvm->arch.crypto.aes_kw = 1;
1849         kvm->arch.crypto.dea_kw = 1;
1850         get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask,
1851                          sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
1852         get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask,
1853                          sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
1854 }
1855
1856 static void sca_dispose(struct kvm *kvm)
1857 {
1858         if (kvm->arch.use_esca)
1859                 free_pages_exact(kvm->arch.sca, sizeof(struct esca_block));
1860         else
1861                 free_page((unsigned long)(kvm->arch.sca));
1862         kvm->arch.sca = NULL;
1863 }
1864
1865 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
1866 {
1867         gfp_t alloc_flags = GFP_KERNEL;
1868         int i, rc;
1869         char debug_name[16];
1870         static unsigned long sca_offset;
1871
1872         rc = -EINVAL;
1873 #ifdef CONFIG_KVM_S390_UCONTROL
1874         if (type & ~KVM_VM_S390_UCONTROL)
1875                 goto out_err;
1876         if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN)))
1877                 goto out_err;
1878 #else
1879         if (type)
1880                 goto out_err;
1881 #endif
1882
1883         rc = s390_enable_sie();
1884         if (rc)
1885                 goto out_err;
1886
1887         rc = -ENOMEM;
1888
1889         kvm->arch.use_esca = 0; /* start with basic SCA */
1890         if (!sclp.has_64bscao)
1891                 alloc_flags |= GFP_DMA;
1892         rwlock_init(&kvm->arch.sca_lock);
1893         kvm->arch.sca = (struct bsca_block *) get_zeroed_page(alloc_flags);
1894         if (!kvm->arch.sca)
1895                 goto out_err;
1896         spin_lock(&kvm_lock);
1897         sca_offset += 16;
1898         if (sca_offset + sizeof(struct bsca_block) > PAGE_SIZE)
1899                 sca_offset = 0;
1900         kvm->arch.sca = (struct bsca_block *)
1901                         ((char *) kvm->arch.sca + sca_offset);
1902         spin_unlock(&kvm_lock);
1903
1904         sprintf(debug_name, "kvm-%u", current->pid);
1905
1906         kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long));
1907         if (!kvm->arch.dbf)
1908                 goto out_err;
1909
1910         kvm->arch.sie_page2 =
1911              (struct sie_page2 *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1912         if (!kvm->arch.sie_page2)
1913                 goto out_err;
1914
1915         /* Populate the facility mask initially. */
1916         memcpy(kvm->arch.model.fac_mask, S390_lowcore.stfle_fac_list,
1917                sizeof(S390_lowcore.stfle_fac_list));
1918         for (i = 0; i < S390_ARCH_FAC_LIST_SIZE_U64; i++) {
1919                 if (i < kvm_s390_fac_list_mask_size())
1920                         kvm->arch.model.fac_mask[i] &= kvm_s390_fac_list_mask[i];
1921                 else
1922                         kvm->arch.model.fac_mask[i] = 0UL;
1923         }
1924
1925         /* Populate the facility list initially. */
1926         kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list;
1927         memcpy(kvm->arch.model.fac_list, kvm->arch.model.fac_mask,
1928                S390_ARCH_FAC_LIST_SIZE_BYTE);
1929
1930         /* we are always in czam mode - even on pre z14 machines */
1931         set_kvm_facility(kvm->arch.model.fac_mask, 138);
1932         set_kvm_facility(kvm->arch.model.fac_list, 138);
1933         /* we emulate STHYI in kvm */
1934         set_kvm_facility(kvm->arch.model.fac_mask, 74);
1935         set_kvm_facility(kvm->arch.model.fac_list, 74);
1936         if (MACHINE_HAS_TLB_GUEST) {
1937                 set_kvm_facility(kvm->arch.model.fac_mask, 147);
1938                 set_kvm_facility(kvm->arch.model.fac_list, 147);
1939         }
1940
1941         kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid();
1942         kvm->arch.model.ibc = sclp.ibc & 0x0fff;
1943
1944         kvm_s390_crypto_init(kvm);
1945
1946         mutex_init(&kvm->arch.float_int.ais_lock);
1947         kvm->arch.float_int.simm = 0;
1948         kvm->arch.float_int.nimm = 0;
1949         spin_lock_init(&kvm->arch.float_int.lock);
1950         for (i = 0; i < FIRQ_LIST_COUNT; i++)
1951                 INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]);
1952         init_waitqueue_head(&kvm->arch.ipte_wq);
1953         mutex_init(&kvm->arch.ipte_mutex);
1954
1955         debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
1956         VM_EVENT(kvm, 3, "vm created with type %lu", type);
1957
1958         if (type & KVM_VM_S390_UCONTROL) {
1959                 kvm->arch.gmap = NULL;
1960                 kvm->arch.mem_limit = KVM_S390_NO_MEM_LIMIT;
1961         } else {
1962                 if (sclp.hamax == U64_MAX)
1963                         kvm->arch.mem_limit = TASK_SIZE_MAX;
1964                 else
1965                         kvm->arch.mem_limit = min_t(unsigned long, TASK_SIZE_MAX,
1966                                                     sclp.hamax + 1);
1967                 kvm->arch.gmap = gmap_create(current->mm, kvm->arch.mem_limit - 1);
1968                 if (!kvm->arch.gmap)
1969                         goto out_err;
1970                 kvm->arch.gmap->private = kvm;
1971                 kvm->arch.gmap->pfault_enabled = 0;
1972         }
1973
1974         kvm->arch.css_support = 0;
1975         kvm->arch.use_irqchip = 0;
1976         kvm->arch.epoch = 0;
1977
1978         spin_lock_init(&kvm->arch.start_stop_lock);
1979         kvm_s390_vsie_init(kvm);
1980         KVM_EVENT(3, "vm 0x%pK created by pid %u", kvm, current->pid);
1981
1982         return 0;
1983 out_err:
1984         free_page((unsigned long)kvm->arch.sie_page2);
1985         debug_unregister(kvm->arch.dbf);
1986         sca_dispose(kvm);
1987         KVM_EVENT(3, "creation of vm failed: %d", rc);
1988         return rc;
1989 }
1990
1991 bool kvm_arch_has_vcpu_debugfs(void)
1992 {
1993         return false;
1994 }
1995
1996 int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
1997 {
1998         return 0;
1999 }
2000
2001 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
2002 {
2003         VCPU_EVENT(vcpu, 3, "%s", "free cpu");
2004         trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
2005         kvm_s390_clear_local_irqs(vcpu);
2006         kvm_clear_async_pf_completion_queue(vcpu);
2007         if (!kvm_is_ucontrol(vcpu->kvm))
2008                 sca_del_vcpu(vcpu);
2009
2010         if (kvm_is_ucontrol(vcpu->kvm))
2011                 gmap_remove(vcpu->arch.gmap);
2012
2013         if (vcpu->kvm->arch.use_cmma)
2014                 kvm_s390_vcpu_unsetup_cmma(vcpu);
2015         free_page((unsigned long)(vcpu->arch.sie_block));
2016
2017         kvm_vcpu_uninit(vcpu);
2018         kmem_cache_free(kvm_vcpu_cache, vcpu);
2019 }
2020
2021 static void kvm_free_vcpus(struct kvm *kvm)
2022 {
2023         unsigned int i;
2024         struct kvm_vcpu *vcpu;
2025
2026         kvm_for_each_vcpu(i, vcpu, kvm)
2027                 kvm_arch_vcpu_destroy(vcpu);
2028
2029         mutex_lock(&kvm->lock);
2030         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
2031                 kvm->vcpus[i] = NULL;
2032
2033         atomic_set(&kvm->online_vcpus, 0);
2034         mutex_unlock(&kvm->lock);
2035 }
2036
2037 void kvm_arch_destroy_vm(struct kvm *kvm)
2038 {
2039         kvm_free_vcpus(kvm);
2040         sca_dispose(kvm);
2041         debug_unregister(kvm->arch.dbf);
2042         free_page((unsigned long)kvm->arch.sie_page2);
2043         if (!kvm_is_ucontrol(kvm))
2044                 gmap_remove(kvm->arch.gmap);
2045         kvm_s390_destroy_adapters(kvm);
2046         kvm_s390_clear_float_irqs(kvm);
2047         kvm_s390_vsie_destroy(kvm);
2048         if (kvm->arch.migration_state) {
2049                 vfree(kvm->arch.migration_state->pgste_bitmap);
2050                 kfree(kvm->arch.migration_state);
2051         }
2052         KVM_EVENT(3, "vm 0x%pK destroyed", kvm);
2053 }
2054
2055 /* Section: vcpu related */
2056 static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu)
2057 {
2058         vcpu->arch.gmap = gmap_create(current->mm, -1UL);
2059         if (!vcpu->arch.gmap)
2060                 return -ENOMEM;
2061         vcpu->arch.gmap->private = vcpu->kvm;
2062
2063         return 0;
2064 }
2065
2066 static void sca_del_vcpu(struct kvm_vcpu *vcpu)
2067 {
2068         if (!kvm_s390_use_sca_entries())
2069                 return;
2070         read_lock(&vcpu->kvm->arch.sca_lock);
2071         if (vcpu->kvm->arch.use_esca) {
2072                 struct esca_block *sca = vcpu->kvm->arch.sca;
2073
2074                 clear_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
2075                 sca->cpu[vcpu->vcpu_id].sda = 0;
2076         } else {
2077                 struct bsca_block *sca = vcpu->kvm->arch.sca;
2078
2079                 clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
2080                 sca->cpu[vcpu->vcpu_id].sda = 0;
2081         }
2082         read_unlock(&vcpu->kvm->arch.sca_lock);
2083 }
2084
2085 static void sca_add_vcpu(struct kvm_vcpu *vcpu)
2086 {
2087         if (!kvm_s390_use_sca_entries()) {
2088                 struct bsca_block *sca = vcpu->kvm->arch.sca;
2089
2090                 /* we still need the basic sca for the ipte control */
2091                 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
2092                 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
2093         }
2094         read_lock(&vcpu->kvm->arch.sca_lock);
2095         if (vcpu->kvm->arch.use_esca) {
2096                 struct esca_block *sca = vcpu->kvm->arch.sca;
2097
2098                 sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
2099                 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
2100                 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca & ~0x3fU;
2101                 vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
2102                 set_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
2103         } else {
2104                 struct bsca_block *sca = vcpu->kvm->arch.sca;
2105
2106                 sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
2107                 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
2108                 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
2109                 set_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
2110         }
2111         read_unlock(&vcpu->kvm->arch.sca_lock);
2112 }
2113
2114 /* Basic SCA to Extended SCA data copy routines */
2115 static inline void sca_copy_entry(struct esca_entry *d, struct bsca_entry *s)
2116 {
2117         d->sda = s->sda;
2118         d->sigp_ctrl.c = s->sigp_ctrl.c;
2119         d->sigp_ctrl.scn = s->sigp_ctrl.scn;
2120 }
2121
2122 static void sca_copy_b_to_e(struct esca_block *d, struct bsca_block *s)
2123 {
2124         int i;
2125
2126         d->ipte_control = s->ipte_control;
2127         d->mcn[0] = s->mcn;
2128         for (i = 0; i < KVM_S390_BSCA_CPU_SLOTS; i++)
2129                 sca_copy_entry(&d->cpu[i], &s->cpu[i]);
2130 }
2131
2132 static int sca_switch_to_extended(struct kvm *kvm)
2133 {
2134         struct bsca_block *old_sca = kvm->arch.sca;
2135         struct esca_block *new_sca;
2136         struct kvm_vcpu *vcpu;
2137         unsigned int vcpu_idx;
2138         u32 scaol, scaoh;
2139
2140         new_sca = alloc_pages_exact(sizeof(*new_sca), GFP_KERNEL|__GFP_ZERO);
2141         if (!new_sca)
2142                 return -ENOMEM;
2143
2144         scaoh = (u32)((u64)(new_sca) >> 32);
2145         scaol = (u32)(u64)(new_sca) & ~0x3fU;
2146
2147         kvm_s390_vcpu_block_all(kvm);
2148         write_lock(&kvm->arch.sca_lock);
2149
2150         sca_copy_b_to_e(new_sca, old_sca);
2151
2152         kvm_for_each_vcpu(vcpu_idx, vcpu, kvm) {
2153                 vcpu->arch.sie_block->scaoh = scaoh;
2154                 vcpu->arch.sie_block->scaol = scaol;
2155                 vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
2156         }
2157         kvm->arch.sca = new_sca;
2158         kvm->arch.use_esca = 1;
2159
2160         write_unlock(&kvm->arch.sca_lock);
2161         kvm_s390_vcpu_unblock_all(kvm);
2162
2163         free_page((unsigned long)old_sca);
2164
2165         VM_EVENT(kvm, 2, "Switched to ESCA (0x%pK -> 0x%pK)",
2166                  old_sca, kvm->arch.sca);
2167         return 0;
2168 }
2169
2170 static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)
2171 {
2172         int rc;
2173
2174         if (!kvm_s390_use_sca_entries()) {
2175                 if (id < KVM_MAX_VCPUS)
2176                         return true;
2177                 return false;
2178         }
2179         if (id < KVM_S390_BSCA_CPU_SLOTS)
2180                 return true;
2181         if (!sclp.has_esca || !sclp.has_64bscao)
2182                 return false;
2183
2184         mutex_lock(&kvm->lock);
2185         rc = kvm->arch.use_esca ? 0 : sca_switch_to_extended(kvm);
2186         mutex_unlock(&kvm->lock);
2187
2188         return rc == 0 && id < KVM_S390_ESCA_CPU_SLOTS;
2189 }
2190
2191 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
2192 {
2193         vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
2194         kvm_clear_async_pf_completion_queue(vcpu);
2195         vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
2196                                     KVM_SYNC_GPRS |
2197                                     KVM_SYNC_ACRS |
2198                                     KVM_SYNC_CRS |
2199                                     KVM_SYNC_ARCH0 |
2200                                     KVM_SYNC_PFAULT;
2201         kvm_s390_set_prefix(vcpu, 0);
2202         if (test_kvm_facility(vcpu->kvm, 64))
2203                 vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;
2204         if (test_kvm_facility(vcpu->kvm, 82))
2205                 vcpu->run->kvm_valid_regs |= KVM_SYNC_BPBC;
2206         if (test_kvm_facility(vcpu->kvm, 133))
2207                 vcpu->run->kvm_valid_regs |= KVM_SYNC_GSCB;
2208         /* fprs can be synchronized via vrs, even if the guest has no vx. With
2209          * MACHINE_HAS_VX, (load|store)_fpu_regs() will work with vrs format.
2210          */
2211         if (MACHINE_HAS_VX)
2212                 vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS;
2213         else
2214                 vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS;
2215
2216         if (kvm_is_ucontrol(vcpu->kvm))
2217                 return __kvm_ucontrol_vcpu_init(vcpu);
2218
2219         return 0;
2220 }
2221
2222 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2223 static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2224 {
2225         WARN_ON_ONCE(vcpu->arch.cputm_start != 0);
2226         raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2227         vcpu->arch.cputm_start = get_tod_clock_fast();
2228         raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2229 }
2230
2231 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2232 static void __stop_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2233 {
2234         WARN_ON_ONCE(vcpu->arch.cputm_start == 0);
2235         raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2236         vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start;
2237         vcpu->arch.cputm_start = 0;
2238         raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2239 }
2240
2241 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2242 static void __enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2243 {
2244         WARN_ON_ONCE(vcpu->arch.cputm_enabled);
2245         vcpu->arch.cputm_enabled = true;
2246         __start_cpu_timer_accounting(vcpu);
2247 }
2248
2249 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2250 static void __disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2251 {
2252         WARN_ON_ONCE(!vcpu->arch.cputm_enabled);
2253         __stop_cpu_timer_accounting(vcpu);
2254         vcpu->arch.cputm_enabled = false;
2255 }
2256
2257 static void enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2258 {
2259         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2260         __enable_cpu_timer_accounting(vcpu);
2261         preempt_enable();
2262 }
2263
2264 static void disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2265 {
2266         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2267         __disable_cpu_timer_accounting(vcpu);
2268         preempt_enable();
2269 }
2270
2271 /* set the cpu timer - may only be called from the VCPU thread itself */
2272 void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm)
2273 {
2274         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2275         raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2276         if (vcpu->arch.cputm_enabled)
2277                 vcpu->arch.cputm_start = get_tod_clock_fast();
2278         vcpu->arch.sie_block->cputm = cputm;
2279         raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2280         preempt_enable();
2281 }
2282
2283 /* update and get the cpu timer - can also be called from other VCPU threads */
2284 __u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu)
2285 {
2286         unsigned int seq;
2287         __u64 value;
2288
2289         if (unlikely(!vcpu->arch.cputm_enabled))
2290                 return vcpu->arch.sie_block->cputm;
2291
2292         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2293         do {
2294                 seq = raw_read_seqcount(&vcpu->arch.cputm_seqcount);
2295                 /*
2296                  * If the writer would ever execute a read in the critical
2297                  * section, e.g. in irq context, we have a deadlock.
2298                  */
2299                 WARN_ON_ONCE((seq & 1) && smp_processor_id() == vcpu->cpu);
2300                 value = vcpu->arch.sie_block->cputm;
2301                 /* if cputm_start is 0, accounting is being started/stopped */
2302                 if (likely(vcpu->arch.cputm_start))
2303                         value -= get_tod_clock_fast() - vcpu->arch.cputm_start;
2304         } while (read_seqcount_retry(&vcpu->arch.cputm_seqcount, seq & ~1));
2305         preempt_enable();
2306         return value;
2307 }
2308
2309 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
2310 {
2311
2312         gmap_enable(vcpu->arch.enabled_gmap);
2313         atomic_or(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
2314         if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
2315                 __start_cpu_timer_accounting(vcpu);
2316         vcpu->cpu = cpu;
2317 }
2318
2319 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
2320 {
2321         vcpu->cpu = -1;
2322         if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
2323                 __stop_cpu_timer_accounting(vcpu);
2324         atomic_andnot(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
2325         vcpu->arch.enabled_gmap = gmap_get_enabled();
2326         gmap_disable(vcpu->arch.enabled_gmap);
2327
2328 }
2329
2330 static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
2331 {
2332         /* this equals initial cpu reset in pop, but we don't switch to ESA */
2333         vcpu->arch.sie_block->gpsw.mask = 0UL;
2334         vcpu->arch.sie_block->gpsw.addr = 0UL;
2335         kvm_s390_set_prefix(vcpu, 0);
2336         kvm_s390_set_cpu_timer(vcpu, 0);
2337         vcpu->arch.sie_block->ckc       = 0UL;
2338         vcpu->arch.sie_block->todpr     = 0;
2339         memset(vcpu->arch.sie_block->gcr, 0, 16 * sizeof(__u64));
2340         vcpu->arch.sie_block->gcr[0]  = 0xE0UL;
2341         vcpu->arch.sie_block->gcr[14] = 0xC2000000UL;
2342         /* make sure the new fpc will be lazily loaded */
2343         save_fpu_regs();
2344         current->thread.fpu.fpc = 0;
2345         vcpu->arch.sie_block->gbea = 1;
2346         vcpu->arch.sie_block->pp = 0;
2347         vcpu->arch.sie_block->fpf &= ~FPF_BPBC;
2348         vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
2349         kvm_clear_async_pf_completion_queue(vcpu);
2350         if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
2351                 kvm_s390_vcpu_stop(vcpu);
2352         kvm_s390_clear_local_irqs(vcpu);
2353 }
2354
2355 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
2356 {
2357         mutex_lock(&vcpu->kvm->lock);
2358         preempt_disable();
2359         vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch;
2360         preempt_enable();
2361         mutex_unlock(&vcpu->kvm->lock);
2362         if (!kvm_is_ucontrol(vcpu->kvm)) {
2363                 vcpu->arch.gmap = vcpu->kvm->arch.gmap;
2364                 sca_add_vcpu(vcpu);
2365         }
2366         if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0)
2367                 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
2368         /* make vcpu_load load the right gmap on the first trigger */
2369         vcpu->arch.enabled_gmap = vcpu->arch.gmap;
2370 }
2371
2372 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
2373 {
2374         if (!test_kvm_facility(vcpu->kvm, 76))
2375                 return;
2376
2377         vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA);
2378
2379         if (vcpu->kvm->arch.crypto.aes_kw)
2380                 vcpu->arch.sie_block->ecb3 |= ECB3_AES;
2381         if (vcpu->kvm->arch.crypto.dea_kw)
2382                 vcpu->arch.sie_block->ecb3 |= ECB3_DEA;
2383
2384         vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd;
2385 }
2386
2387 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu)
2388 {
2389         free_page(vcpu->arch.sie_block->cbrlo);
2390         vcpu->arch.sie_block->cbrlo = 0;
2391 }
2392
2393 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu)
2394 {
2395         vcpu->arch.sie_block->cbrlo = get_zeroed_page(GFP_KERNEL);
2396         if (!vcpu->arch.sie_block->cbrlo)
2397                 return -ENOMEM;
2398
2399         vcpu->arch.sie_block->ecb2 &= ~ECB2_PFMFI;
2400         return 0;
2401 }
2402
2403 static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu)
2404 {
2405         struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model;
2406
2407         vcpu->arch.sie_block->ibc = model->ibc;
2408         if (test_kvm_facility(vcpu->kvm, 7))
2409                 vcpu->arch.sie_block->fac = (u32)(u64) model->fac_list;
2410 }
2411
2412 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
2413 {
2414         int rc = 0;
2415
2416         atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
2417                                                     CPUSTAT_SM |
2418                                                     CPUSTAT_STOPPED);
2419
2420         if (test_kvm_facility(vcpu->kvm, 78))
2421                 atomic_or(CPUSTAT_GED2, &vcpu->arch.sie_block->cpuflags);
2422         else if (test_kvm_facility(vcpu->kvm, 8))
2423                 atomic_or(CPUSTAT_GED, &vcpu->arch.sie_block->cpuflags);
2424
2425         kvm_s390_vcpu_setup_model(vcpu);
2426
2427         /* pgste_set_pte has special handling for !MACHINE_HAS_ESOP */
2428         if (MACHINE_HAS_ESOP)
2429                 vcpu->arch.sie_block->ecb |= ECB_HOSTPROTINT;
2430         if (test_kvm_facility(vcpu->kvm, 9))
2431                 vcpu->arch.sie_block->ecb |= ECB_SRSI;
2432         if (test_kvm_facility(vcpu->kvm, 73))
2433                 vcpu->arch.sie_block->ecb |= ECB_TE;
2434
2435         if (test_kvm_facility(vcpu->kvm, 8) && sclp.has_pfmfi)
2436                 vcpu->arch.sie_block->ecb2 |= ECB2_PFMFI;
2437         if (test_kvm_facility(vcpu->kvm, 130))
2438                 vcpu->arch.sie_block->ecb2 |= ECB2_IEP;
2439         vcpu->arch.sie_block->eca = ECA_MVPGI | ECA_PROTEXCI;
2440         if (sclp.has_cei)
2441                 vcpu->arch.sie_block->eca |= ECA_CEI;
2442         if (sclp.has_ib)
2443                 vcpu->arch.sie_block->eca |= ECA_IB;
2444         if (sclp.has_siif)
2445                 vcpu->arch.sie_block->eca |= ECA_SII;
2446         if (sclp.has_sigpif)
2447                 vcpu->arch.sie_block->eca |= ECA_SIGPI;
2448         if (test_kvm_facility(vcpu->kvm, 129)) {
2449                 vcpu->arch.sie_block->eca |= ECA_VX;
2450                 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
2451         }
2452         if (test_kvm_facility(vcpu->kvm, 139))
2453                 vcpu->arch.sie_block->ecd |= ECD_MEF;
2454
2455         vcpu->arch.sie_block->sdnxo = ((unsigned long) &vcpu->run->s.regs.sdnx)
2456                                         | SDNXC;
2457         vcpu->arch.sie_block->riccbd = (unsigned long) &vcpu->run->s.regs.riccb;
2458
2459         if (sclp.has_kss)
2460                 atomic_or(CPUSTAT_KSS, &vcpu->arch.sie_block->cpuflags);
2461         else
2462                 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
2463
2464         if (vcpu->kvm->arch.use_cmma) {
2465                 rc = kvm_s390_vcpu_setup_cmma(vcpu);
2466                 if (rc)
2467                         return rc;
2468         }
2469         hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
2470         vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
2471
2472         kvm_s390_vcpu_crypto_setup(vcpu);
2473
2474         return rc;
2475 }
2476
2477 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
2478                                       unsigned int id)
2479 {
2480         struct kvm_vcpu *vcpu;
2481         struct sie_page *sie_page;
2482         int rc = -EINVAL;
2483
2484         if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id))
2485                 goto out;
2486
2487         rc = -ENOMEM;
2488
2489         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
2490         if (!vcpu)
2491                 goto out;
2492
2493         BUILD_BUG_ON(sizeof(struct sie_page) != 4096);
2494         sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL);
2495         if (!sie_page)
2496                 goto out_free_cpu;
2497
2498         vcpu->arch.sie_block = &sie_page->sie_block;
2499         vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb;
2500
2501         /* the real guest size will always be smaller than msl */
2502         vcpu->arch.sie_block->mso = 0;
2503         vcpu->arch.sie_block->msl = sclp.hamax;
2504
2505         vcpu->arch.sie_block->icpua = id;
2506         spin_lock_init(&vcpu->arch.local_int.lock);
2507         vcpu->arch.local_int.float_int = &kvm->arch.float_int;
2508         vcpu->arch.local_int.wq = &vcpu->wq;
2509         vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags;
2510         seqcount_init(&vcpu->arch.cputm_seqcount);
2511
2512         rc = kvm_vcpu_init(vcpu, kvm, id);
2513         if (rc)
2514                 goto out_free_sie_block;
2515         VM_EVENT(kvm, 3, "create cpu %d at 0x%pK, sie block at 0x%pK", id, vcpu,
2516                  vcpu->arch.sie_block);
2517         trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block);
2518
2519         return vcpu;
2520 out_free_sie_block:
2521         free_page((unsigned long)(vcpu->arch.sie_block));
2522 out_free_cpu:
2523         kmem_cache_free(kvm_vcpu_cache, vcpu);
2524 out:
2525         return ERR_PTR(rc);
2526 }
2527
2528 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
2529 {
2530         return kvm_s390_vcpu_has_irq(vcpu, 0);
2531 }
2532
2533 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
2534 {
2535         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE);
2536 }
2537
2538 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu)
2539 {
2540         atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
2541         exit_sie(vcpu);
2542 }
2543
2544 void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu)
2545 {
2546         atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
2547 }
2548
2549 static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu)
2550 {
2551         atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
2552         exit_sie(vcpu);
2553 }
2554
2555 static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu)
2556 {
2557         atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
2558 }
2559
2560 /*
2561  * Kick a guest cpu out of SIE and wait until SIE is not running.
2562  * If the CPU is not running (e.g. waiting as idle) the function will
2563  * return immediately. */
2564 void exit_sie(struct kvm_vcpu *vcpu)
2565 {
2566         atomic_or(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags);
2567         while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE)
2568                 cpu_relax();
2569 }
2570
2571 /* Kick a guest cpu out of SIE to process a request synchronously */
2572 void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu)
2573 {
2574         kvm_make_request(req, vcpu);
2575         kvm_s390_vcpu_request(vcpu);
2576 }
2577
2578 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
2579                               unsigned long end)
2580 {
2581         struct kvm *kvm = gmap->private;
2582         struct kvm_vcpu *vcpu;
2583         unsigned long prefix;
2584         int i;
2585
2586         if (gmap_is_shadow(gmap))
2587                 return;
2588         if (start >= 1UL << 31)
2589                 /* We are only interested in prefix pages */
2590                 return;
2591         kvm_for_each_vcpu(i, vcpu, kvm) {
2592                 /* match against both prefix pages */
2593                 prefix = kvm_s390_get_prefix(vcpu);
2594                 if (prefix <= end && start <= prefix + 2*PAGE_SIZE - 1) {
2595                         VCPU_EVENT(vcpu, 2, "gmap notifier for %lx-%lx",
2596                                    start, end);
2597                         kvm_s390_sync_request(KVM_REQ_MMU_RELOAD, vcpu);
2598                 }
2599         }
2600 }
2601
2602 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
2603 {
2604         /* kvm common code refers to this, but never calls it */
2605         BUG();
2606         return 0;
2607 }
2608
2609 static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
2610                                            struct kvm_one_reg *reg)
2611 {
2612         int r = -EINVAL;
2613
2614         switch (reg->id) {
2615         case KVM_REG_S390_TODPR:
2616                 r = put_user(vcpu->arch.sie_block->todpr,
2617                              (u32 __user *)reg->addr);
2618                 break;
2619         case KVM_REG_S390_EPOCHDIFF:
2620                 r = put_user(vcpu->arch.sie_block->epoch,
2621                              (u64 __user *)reg->addr);
2622                 break;
2623         case KVM_REG_S390_CPU_TIMER:
2624                 r = put_user(kvm_s390_get_cpu_timer(vcpu),
2625                              (u64 __user *)reg->addr);
2626                 break;
2627         case KVM_REG_S390_CLOCK_COMP:
2628                 r = put_user(vcpu->arch.sie_block->ckc,
2629                              (u64 __user *)reg->addr);
2630                 break;
2631         case KVM_REG_S390_PFTOKEN:
2632                 r = put_user(vcpu->arch.pfault_token,
2633                              (u64 __user *)reg->addr);
2634                 break;
2635         case KVM_REG_S390_PFCOMPARE:
2636                 r = put_user(vcpu->arch.pfault_compare,
2637                              (u64 __user *)reg->addr);
2638                 break;
2639         case KVM_REG_S390_PFSELECT:
2640                 r = put_user(vcpu->arch.pfault_select,
2641                              (u64 __user *)reg->addr);
2642                 break;
2643         case KVM_REG_S390_PP:
2644                 r = put_user(vcpu->arch.sie_block->pp,
2645                              (u64 __user *)reg->addr);
2646                 break;
2647         case KVM_REG_S390_GBEA:
2648                 r = put_user(vcpu->arch.sie_block->gbea,
2649                              (u64 __user *)reg->addr);
2650                 break;
2651         default:
2652                 break;
2653         }
2654
2655         return r;
2656 }
2657
2658 static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
2659                                            struct kvm_one_reg *reg)
2660 {
2661         int r = -EINVAL;
2662         __u64 val;
2663
2664         switch (reg->id) {
2665         case KVM_REG_S390_TODPR:
2666                 r = get_user(vcpu->arch.sie_block->todpr,
2667                              (u32 __user *)reg->addr);
2668                 break;
2669         case KVM_REG_S390_EPOCHDIFF:
2670                 r = get_user(vcpu->arch.sie_block->epoch,
2671                              (u64 __user *)reg->addr);
2672                 break;
2673         case KVM_REG_S390_CPU_TIMER:
2674                 r = get_user(val, (u64 __user *)reg->addr);
2675                 if (!r)
2676                         kvm_s390_set_cpu_timer(vcpu, val);
2677                 break;
2678         case KVM_REG_S390_CLOCK_COMP:
2679                 r = get_user(vcpu->arch.sie_block->ckc,
2680                              (u64 __user *)reg->addr);
2681                 break;
2682         case KVM_REG_S390_PFTOKEN:
2683                 r = get_user(vcpu->arch.pfault_token,
2684                              (u64 __user *)reg->addr);
2685                 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
2686                         kvm_clear_async_pf_completion_queue(vcpu);
2687                 break;
2688         case KVM_REG_S390_PFCOMPARE:
2689                 r = get_user(vcpu->arch.pfault_compare,
2690                              (u64 __user *)reg->addr);
2691                 break;
2692         case KVM_REG_S390_PFSELECT:
2693                 r = get_user(vcpu->arch.pfault_select,
2694                              (u64 __user *)reg->addr);
2695                 break;
2696         case KVM_REG_S390_PP:
2697                 r = get_user(vcpu->arch.sie_block->pp,
2698                              (u64 __user *)reg->addr);
2699                 break;
2700         case KVM_REG_S390_GBEA:
2701                 r = get_user(vcpu->arch.sie_block->gbea,
2702                              (u64 __user *)reg->addr);
2703                 break;
2704         default:
2705                 break;
2706         }
2707
2708         return r;
2709 }
2710
2711 static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
2712 {
2713         kvm_s390_vcpu_initial_reset(vcpu);
2714         return 0;
2715 }
2716
2717 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
2718 {
2719         memcpy(&vcpu->run->s.regs.gprs, &regs->gprs, sizeof(regs->gprs));
2720         return 0;
2721 }
2722
2723 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
2724 {
2725         memcpy(&regs->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs));
2726         return 0;
2727 }
2728
2729 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2730                                   struct kvm_sregs *sregs)
2731 {
2732         memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs));
2733         memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));
2734         return 0;
2735 }
2736
2737 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
2738                                   struct kvm_sregs *sregs)
2739 {
2740         memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs));
2741         memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs));
2742         return 0;
2743 }
2744
2745 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2746 {
2747         if (test_fp_ctl(fpu->fpc))
2748                 return -EINVAL;
2749         vcpu->run->s.regs.fpc = fpu->fpc;
2750         if (MACHINE_HAS_VX)
2751                 convert_fp_to_vx((__vector128 *) vcpu->run->s.regs.vrs,
2752                                  (freg_t *) fpu->fprs);
2753         else
2754                 memcpy(vcpu->run->s.regs.fprs, &fpu->fprs, sizeof(fpu->fprs));
2755         return 0;
2756 }
2757
2758 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2759 {
2760         /* make sure we have the latest values */
2761         save_fpu_regs();
2762         if (MACHINE_HAS_VX)
2763                 convert_vx_to_fp((freg_t *) fpu->fprs,
2764                                  (__vector128 *) vcpu->run->s.regs.vrs);
2765         else
2766                 memcpy(fpu->fprs, vcpu->run->s.regs.fprs, sizeof(fpu->fprs));
2767         fpu->fpc = vcpu->run->s.regs.fpc;
2768         return 0;
2769 }
2770
2771 static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
2772 {
2773         int rc = 0;
2774
2775         if (!is_vcpu_stopped(vcpu))
2776                 rc = -EBUSY;
2777         else {
2778                 vcpu->run->psw_mask = psw.mask;
2779                 vcpu->run->psw_addr = psw.addr;
2780         }
2781         return rc;
2782 }
2783
2784 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2785                                   struct kvm_translation *tr)
2786 {
2787         return -EINVAL; /* not implemented yet */
2788 }
2789
2790 #define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \
2791                               KVM_GUESTDBG_USE_HW_BP | \
2792                               KVM_GUESTDBG_ENABLE)
2793
2794 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
2795                                         struct kvm_guest_debug *dbg)
2796 {
2797         int rc = 0;
2798
2799         vcpu->guest_debug = 0;
2800         kvm_s390_clear_bp_data(vcpu);
2801
2802         if (dbg->control & ~VALID_GUESTDBG_FLAGS)
2803                 return -EINVAL;
2804         if (!sclp.has_gpere)
2805                 return -EINVAL;
2806
2807         if (dbg->control & KVM_GUESTDBG_ENABLE) {
2808                 vcpu->guest_debug = dbg->control;
2809                 /* enforce guest PER */
2810                 atomic_or(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2811
2812                 if (dbg->control & KVM_GUESTDBG_USE_HW_BP)
2813                         rc = kvm_s390_import_bp_data(vcpu, dbg);
2814         } else {
2815                 atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2816                 vcpu->arch.guestdbg.last_bp = 0;
2817         }
2818
2819         if (rc) {
2820                 vcpu->guest_debug = 0;
2821                 kvm_s390_clear_bp_data(vcpu);
2822                 atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2823         }
2824
2825         return rc;
2826 }
2827
2828 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
2829                                     struct kvm_mp_state *mp_state)
2830 {
2831         /* CHECK_STOP and LOAD are not supported yet */
2832         return is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED :
2833                                        KVM_MP_STATE_OPERATING;
2834 }
2835
2836 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
2837                                     struct kvm_mp_state *mp_state)
2838 {
2839         int rc = 0;
2840
2841         /* user space knows about this interface - let it control the state */
2842         vcpu->kvm->arch.user_cpu_state_ctrl = 1;
2843
2844         switch (mp_state->mp_state) {
2845         case KVM_MP_STATE_STOPPED:
2846                 kvm_s390_vcpu_stop(vcpu);
2847                 break;
2848         case KVM_MP_STATE_OPERATING:
2849                 kvm_s390_vcpu_start(vcpu);
2850                 break;
2851         case KVM_MP_STATE_LOAD:
2852         case KVM_MP_STATE_CHECK_STOP:
2853                 /* fall through - CHECK_STOP and LOAD are not supported yet */
2854         default:
2855                 rc = -ENXIO;
2856         }
2857
2858         return rc;
2859 }
2860
2861 static bool ibs_enabled(struct kvm_vcpu *vcpu)
2862 {
2863         return atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_IBS;
2864 }
2865
2866 static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
2867 {
2868 retry:
2869         kvm_s390_vcpu_request_handled(vcpu);
2870         if (!kvm_request_pending(vcpu))
2871                 return 0;
2872         /*
2873          * We use MMU_RELOAD just to re-arm the ipte notifier for the
2874          * guest prefix page. gmap_mprotect_notify will wait on the ptl lock.
2875          * This ensures that the ipte instruction for this request has
2876          * already finished. We might race against a second unmapper that
2877          * wants to set the blocking bit. Lets just retry the request loop.
2878          */
2879         if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) {
2880                 int rc;
2881                 rc = gmap_mprotect_notify(vcpu->arch.gmap,
2882                                           kvm_s390_get_prefix(vcpu),
2883                                           PAGE_SIZE * 2, PROT_WRITE);
2884                 if (rc) {
2885                         kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
2886                         return rc;
2887                 }
2888                 goto retry;
2889         }
2890
2891         if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
2892                 vcpu->arch.sie_block->ihcpu = 0xffff;
2893                 goto retry;
2894         }
2895
2896         if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) {
2897                 if (!ibs_enabled(vcpu)) {
2898                         trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1);
2899                         atomic_or(CPUSTAT_IBS,
2900                                         &vcpu->arch.sie_block->cpuflags);
2901                 }
2902                 goto retry;
2903         }
2904
2905         if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) {
2906                 if (ibs_enabled(vcpu)) {
2907                         trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0);
2908                         atomic_andnot(CPUSTAT_IBS,
2909                                           &vcpu->arch.sie_block->cpuflags);
2910                 }
2911                 goto retry;
2912         }
2913
2914         if (kvm_check_request(KVM_REQ_ICPT_OPEREXC, vcpu)) {
2915                 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
2916                 goto retry;
2917         }
2918
2919         if (kvm_check_request(KVM_REQ_START_MIGRATION, vcpu)) {
2920                 /*
2921                  * Disable CMMA virtualization; we will emulate the ESSA
2922                  * instruction manually, in order to provide additional
2923                  * functionalities needed for live migration.
2924                  */
2925                 vcpu->arch.sie_block->ecb2 &= ~ECB2_CMMA;
2926                 goto retry;
2927         }
2928
2929         if (kvm_check_request(KVM_REQ_STOP_MIGRATION, vcpu)) {
2930                 /*
2931                  * Re-enable CMMA virtualization if CMMA is available and
2932                  * was used.
2933                  */
2934                 if ((vcpu->kvm->arch.use_cmma) &&
2935                     (vcpu->kvm->mm->context.use_cmma))
2936                         vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
2937                 goto retry;
2938         }
2939
2940         /* nothing to do, just clear the request */
2941         kvm_clear_request(KVM_REQ_UNHALT, vcpu);
2942
2943         return 0;
2944 }
2945
2946 void kvm_s390_set_tod_clock_ext(struct kvm *kvm,
2947                                  const struct kvm_s390_vm_tod_clock *gtod)
2948 {
2949         struct kvm_vcpu *vcpu;
2950         struct kvm_s390_tod_clock_ext htod;
2951         int i;
2952
2953         mutex_lock(&kvm->lock);
2954         preempt_disable();
2955
2956         get_tod_clock_ext((char *)&htod);
2957
2958         kvm->arch.epoch = gtod->tod - htod.tod;
2959         kvm->arch.epdx = gtod->epoch_idx - htod.epoch_idx;
2960
2961         if (kvm->arch.epoch > gtod->tod)
2962                 kvm->arch.epdx -= 1;
2963
2964         kvm_s390_vcpu_block_all(kvm);
2965         kvm_for_each_vcpu(i, vcpu, kvm) {
2966                 vcpu->arch.sie_block->epoch = kvm->arch.epoch;
2967                 vcpu->arch.sie_block->epdx  = kvm->arch.epdx;
2968         }
2969
2970         kvm_s390_vcpu_unblock_all(kvm);
2971         preempt_enable();
2972         mutex_unlock(&kvm->lock);
2973 }
2974
2975 void kvm_s390_set_tod_clock(struct kvm *kvm, u64 tod)
2976 {
2977         struct kvm_vcpu *vcpu;
2978         int i;
2979
2980         mutex_lock(&kvm->lock);
2981         preempt_disable();
2982         kvm->arch.epoch = tod - get_tod_clock();
2983         kvm_s390_vcpu_block_all(kvm);
2984         kvm_for_each_vcpu(i, vcpu, kvm)
2985                 vcpu->arch.sie_block->epoch = kvm->arch.epoch;
2986         kvm_s390_vcpu_unblock_all(kvm);
2987         preempt_enable();
2988         mutex_unlock(&kvm->lock);
2989 }
2990
2991 /**
2992  * kvm_arch_fault_in_page - fault-in guest page if necessary
2993  * @vcpu: The corresponding virtual cpu
2994  * @gpa: Guest physical address
2995  * @writable: Whether the page should be writable or not
2996  *
2997  * Make sure that a guest page has been faulted-in on the host.
2998  *
2999  * Return: Zero on success, negative error code otherwise.
3000  */
3001 long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable)
3002 {
3003         return gmap_fault(vcpu->arch.gmap, gpa,
3004                           writable ? FAULT_FLAG_WRITE : 0);
3005 }
3006
3007 static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token,
3008                                       unsigned long token)
3009 {
3010         struct kvm_s390_interrupt inti;
3011         struct kvm_s390_irq irq;
3012
3013         if (start_token) {
3014                 irq.u.ext.ext_params2 = token;
3015                 irq.type = KVM_S390_INT_PFAULT_INIT;
3016                 WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq));
3017         } else {
3018                 inti.type = KVM_S390_INT_PFAULT_DONE;
3019                 inti.parm64 = token;
3020                 WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti));
3021         }
3022 }
3023
3024 void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
3025                                      struct kvm_async_pf *work)
3026 {
3027         trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token);
3028         __kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token);
3029 }
3030
3031 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
3032                                  struct kvm_async_pf *work)
3033 {
3034         trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token);
3035         __kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token);
3036 }
3037
3038 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu,
3039                                struct kvm_async_pf *work)
3040 {
3041         /* s390 will always inject the page directly */
3042 }
3043
3044 bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu)
3045 {
3046         /*
3047          * s390 will always inject the page directly,
3048          * but we still want check_async_completion to cleanup
3049          */
3050         return true;
3051 }
3052
3053 static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu)
3054 {
3055         hva_t hva;
3056         struct kvm_arch_async_pf arch;
3057         int rc;
3058
3059         if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
3060                 return 0;
3061         if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) !=
3062             vcpu->arch.pfault_compare)
3063                 return 0;
3064         if (psw_extint_disabled(vcpu))
3065                 return 0;
3066         if (kvm_s390_vcpu_has_irq(vcpu, 0))
3067                 return 0;
3068         if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
3069                 return 0;
3070         if (!vcpu->arch.gmap->pfault_enabled)
3071                 return 0;
3072
3073         hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr));
3074         hva += current->thread.gmap_addr & ~PAGE_MASK;
3075         if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8))
3076                 return 0;
3077
3078         rc = kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch);
3079         return rc;
3080 }
3081
3082 static int vcpu_pre_run(struct kvm_vcpu *vcpu)
3083 {
3084         int rc, cpuflags;
3085
3086         /*
3087          * On s390 notifications for arriving pages will be delivered directly
3088          * to the guest but the house keeping for completed pfaults is
3089          * handled outside the worker.
3090          */
3091         kvm_check_async_pf_completion(vcpu);
3092
3093         vcpu->arch.sie_block->gg14 = vcpu->run->s.regs.gprs[14];
3094         vcpu->arch.sie_block->gg15 = vcpu->run->s.regs.gprs[15];
3095
3096         if (need_resched())
3097                 schedule();
3098
3099         if (test_cpu_flag(CIF_MCCK_PENDING))
3100                 s390_handle_mcck();
3101
3102         if (!kvm_is_ucontrol(vcpu->kvm)) {
3103                 rc = kvm_s390_deliver_pending_interrupts(vcpu);
3104                 if (rc)
3105                         return rc;
3106         }
3107
3108         rc = kvm_s390_handle_requests(vcpu);
3109         if (rc)
3110                 return rc;
3111
3112         if (guestdbg_enabled(vcpu)) {
3113                 kvm_s390_backup_guest_per_regs(vcpu);
3114                 kvm_s390_patch_guest_per_regs(vcpu);
3115         }
3116
3117         vcpu->arch.sie_block->icptcode = 0;
3118         cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags);
3119         VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags);
3120         trace_kvm_s390_sie_enter(vcpu, cpuflags);
3121
3122         return 0;
3123 }
3124
3125 static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu)
3126 {
3127         struct kvm_s390_pgm_info pgm_info = {
3128                 .code = PGM_ADDRESSING,
3129         };
3130         u8 opcode, ilen;
3131         int rc;
3132
3133         VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction");
3134         trace_kvm_s390_sie_fault(vcpu);
3135
3136         /*
3137          * We want to inject an addressing exception, which is defined as a
3138          * suppressing or terminating exception. However, since we came here
3139          * by a DAT access exception, the PSW still points to the faulting
3140          * instruction since DAT exceptions are nullifying. So we've got
3141          * to look up the current opcode to get the length of the instruction
3142          * to be able to forward the PSW.
3143          */
3144         rc = read_guest_instr(vcpu, vcpu->arch.sie_block->gpsw.addr, &opcode, 1);
3145         ilen = insn_length(opcode);
3146         if (rc < 0) {
3147                 return rc;
3148         } else if (rc) {
3149                 /* Instruction-Fetching Exceptions - we can't detect the ilen.
3150                  * Forward by arbitrary ilc, injection will take care of
3151                  * nullification if necessary.
3152                  */
3153                 pgm_info = vcpu->arch.pgm;
3154                 ilen = 4;
3155         }
3156         pgm_info.flags = ilen | KVM_S390_PGM_FLAGS_ILC_VALID;
3157         kvm_s390_forward_psw(vcpu, ilen);
3158         return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
3159 }
3160
3161 static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason)
3162 {
3163         struct mcck_volatile_info *mcck_info;
3164         struct sie_page *sie_page;
3165
3166         VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
3167                    vcpu->arch.sie_block->icptcode);
3168         trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);
3169
3170         if (guestdbg_enabled(vcpu))
3171                 kvm_s390_restore_guest_per_regs(vcpu);
3172
3173         vcpu->run->s.regs.gprs[14] = vcpu->arch.sie_block->gg14;
3174         vcpu->run->s.regs.gprs[15] = vcpu->arch.sie_block->gg15;
3175
3176         if (exit_reason == -EINTR) {
3177                 VCPU_EVENT(vcpu, 3, "%s", "machine check");
3178                 sie_page = container_of(vcpu->arch.sie_block,
3179                                         struct sie_page, sie_block);
3180                 mcck_info = &sie_page->mcck_info;
3181                 kvm_s390_reinject_machine_check(vcpu, mcck_info);
3182                 return 0;
3183         }
3184
3185         if (vcpu->arch.sie_block->icptcode > 0) {
3186                 int rc = kvm_handle_sie_intercept(vcpu);
3187
3188                 if (rc != -EOPNOTSUPP)
3189                         return rc;
3190                 vcpu->run->exit_reason = KVM_EXIT_S390_SIEIC;
3191                 vcpu->run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode;
3192                 vcpu->run->s390_sieic.ipa = vcpu->arch.sie_block->ipa;
3193                 vcpu->run->s390_sieic.ipb = vcpu->arch.sie_block->ipb;
3194                 return -EREMOTE;
3195         } else if (exit_reason != -EFAULT) {
3196                 vcpu->stat.exit_null++;
3197                 return 0;
3198         } else if (kvm_is_ucontrol(vcpu->kvm)) {
3199                 vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL;
3200                 vcpu->run->s390_ucontrol.trans_exc_code =
3201                                                 current->thread.gmap_addr;
3202                 vcpu->run->s390_ucontrol.pgm_code = 0x10;
3203                 return -EREMOTE;
3204         } else if (current->thread.gmap_pfault) {
3205                 trace_kvm_s390_major_guest_pfault(vcpu);
3206                 current->thread.gmap_pfault = 0;
3207                 if (kvm_arch_setup_async_pf(vcpu))
3208                         return 0;
3209                 return kvm_arch_fault_in_page(vcpu, current->thread.gmap_addr, 1);
3210         }
3211         return vcpu_post_run_fault_in_sie(vcpu);
3212 }
3213
3214 static int __vcpu_run(struct kvm_vcpu *vcpu)
3215 {
3216         int rc, exit_reason;
3217
3218         /*
3219          * We try to hold kvm->srcu during most of vcpu_run (except when run-
3220          * ning the guest), so that memslots (and other stuff) are protected
3221          */
3222         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
3223
3224         do {
3225                 rc = vcpu_pre_run(vcpu);
3226                 if (rc)
3227                         break;
3228
3229                 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
3230                 /*
3231                  * As PF_VCPU will be used in fault handler, between
3232                  * guest_enter and guest_exit should be no uaccess.
3233                  */
3234                 local_irq_disable();
3235                 guest_enter_irqoff();
3236                 __disable_cpu_timer_accounting(vcpu);
3237                 local_irq_enable();
3238                 exit_reason = sie64a(vcpu->arch.sie_block,
3239                                      vcpu->run->s.regs.gprs);
3240                 local_irq_disable();
3241                 __enable_cpu_timer_accounting(vcpu);
3242                 guest_exit_irqoff();
3243                 local_irq_enable();
3244                 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
3245
3246                 rc = vcpu_post_run(vcpu, exit_reason);
3247         } while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc);
3248
3249         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
3250         return rc;
3251 }
3252
3253 static void sync_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3254 {
3255         struct runtime_instr_cb *riccb;
3256         struct gs_cb *gscb;
3257
3258         riccb = (struct runtime_instr_cb *) &kvm_run->s.regs.riccb;
3259         gscb = (struct gs_cb *) &kvm_run->s.regs.gscb;
3260         vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
3261         vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
3262         if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX)
3263                 kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
3264         if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) {
3265                 memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128);
3266                 /* some control register changes require a tlb flush */
3267                 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
3268         }
3269         if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
3270                 kvm_s390_set_cpu_timer(vcpu, kvm_run->s.regs.cputm);
3271                 vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc;
3272                 vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr;
3273                 vcpu->arch.sie_block->pp = kvm_run->s.regs.pp;
3274                 vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea;
3275         }
3276         if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) {
3277                 vcpu->arch.pfault_token = kvm_run->s.regs.pft;
3278                 vcpu->arch.pfault_select = kvm_run->s.regs.pfs;
3279                 vcpu->arch.pfault_compare = kvm_run->s.regs.pfc;
3280                 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
3281                         kvm_clear_async_pf_completion_queue(vcpu);
3282         }
3283         /*
3284          * If userspace sets the riccb (e.g. after migration) to a valid state,
3285          * we should enable RI here instead of doing the lazy enablement.
3286          */
3287         if ((kvm_run->kvm_dirty_regs & KVM_SYNC_RICCB) &&
3288             test_kvm_facility(vcpu->kvm, 64) &&
3289             riccb->v &&
3290             !(vcpu->arch.sie_block->ecb3 & ECB3_RI)) {
3291                 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (sync_regs)");
3292                 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
3293         }
3294         /*
3295          * If userspace sets the gscb (e.g. after migration) to non-zero,
3296          * we should enable GS here instead of doing the lazy enablement.
3297          */
3298         if ((kvm_run->kvm_dirty_regs & KVM_SYNC_GSCB) &&
3299             test_kvm_facility(vcpu->kvm, 133) &&
3300             gscb->gssm &&
3301             !vcpu->arch.gs_enabled) {
3302                 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (sync_regs)");
3303                 vcpu->arch.sie_block->ecb |= ECB_GS;
3304                 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
3305                 vcpu->arch.gs_enabled = 1;
3306         }
3307         if ((kvm_run->kvm_dirty_regs & KVM_SYNC_BPBC) &&
3308             test_kvm_facility(vcpu->kvm, 82)) {
3309                 vcpu->arch.sie_block->fpf &= ~FPF_BPBC;
3310                 vcpu->arch.sie_block->fpf |= kvm_run->s.regs.bpbc ? FPF_BPBC : 0;
3311         }
3312         save_access_regs(vcpu->arch.host_acrs);
3313         restore_access_regs(vcpu->run->s.regs.acrs);
3314         /* save host (userspace) fprs/vrs */
3315         save_fpu_regs();
3316         vcpu->arch.host_fpregs.fpc = current->thread.fpu.fpc;
3317         vcpu->arch.host_fpregs.regs = current->thread.fpu.regs;
3318         if (MACHINE_HAS_VX)
3319                 current->thread.fpu.regs = vcpu->run->s.regs.vrs;
3320         else
3321                 current->thread.fpu.regs = vcpu->run->s.regs.fprs;
3322         current->thread.fpu.fpc = vcpu->run->s.regs.fpc;
3323         if (test_fp_ctl(current->thread.fpu.fpc))
3324                 /* User space provided an invalid FPC, let's clear it */
3325                 current->thread.fpu.fpc = 0;
3326         if (MACHINE_HAS_GS) {
3327                 preempt_disable();
3328                 __ctl_set_bit(2, 4);
3329                 if (current->thread.gs_cb) {
3330                         vcpu->arch.host_gscb = current->thread.gs_cb;
3331                         save_gs_cb(vcpu->arch.host_gscb);
3332                 }
3333                 if (vcpu->arch.gs_enabled) {
3334                         current->thread.gs_cb = (struct gs_cb *)
3335                                                 &vcpu->run->s.regs.gscb;
3336                         restore_gs_cb(current->thread.gs_cb);
3337                 }
3338                 preempt_enable();
3339         }
3340
3341         kvm_run->kvm_dirty_regs = 0;
3342 }
3343
3344 static void store_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3345 {
3346         kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask;
3347         kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr;
3348         kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu);
3349         memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128);
3350         kvm_run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu);
3351         kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc;
3352         kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr;
3353         kvm_run->s.regs.pp = vcpu->arch.sie_block->pp;
3354         kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea;
3355         kvm_run->s.regs.pft = vcpu->arch.pfault_token;
3356         kvm_run->s.regs.pfs = vcpu->arch.pfault_select;
3357         kvm_run->s.regs.pfc = vcpu->arch.pfault_compare;
3358         kvm_run->s.regs.bpbc = (vcpu->arch.sie_block->fpf & FPF_BPBC) == FPF_BPBC;
3359         save_access_regs(vcpu->run->s.regs.acrs);
3360         restore_access_regs(vcpu->arch.host_acrs);
3361         /* Save guest register state */
3362         save_fpu_regs();
3363         vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
3364         /* Restore will be done lazily at return */
3365         current->thread.fpu.fpc = vcpu->arch.host_fpregs.fpc;
3366         current->thread.fpu.regs = vcpu->arch.host_fpregs.regs;
3367         if (MACHINE_HAS_GS) {
3368                 __ctl_set_bit(2, 4);
3369                 if (vcpu->arch.gs_enabled)
3370                         save_gs_cb(current->thread.gs_cb);
3371                 preempt_disable();
3372                 current->thread.gs_cb = vcpu->arch.host_gscb;
3373                 restore_gs_cb(vcpu->arch.host_gscb);
3374                 preempt_enable();
3375                 if (!vcpu->arch.host_gscb)
3376                         __ctl_clear_bit(2, 4);
3377                 vcpu->arch.host_gscb = NULL;
3378         }
3379
3380 }
3381
3382 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3383 {
3384         int rc;
3385
3386         if (kvm_run->immediate_exit)
3387                 return -EINTR;
3388
3389         if (guestdbg_exit_pending(vcpu)) {
3390                 kvm_s390_prepare_debug_exit(vcpu);
3391                 return 0;
3392         }
3393
3394         kvm_sigset_activate(vcpu);
3395
3396         if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) {
3397                 kvm_s390_vcpu_start(vcpu);
3398         } else if (is_vcpu_stopped(vcpu)) {
3399                 pr_err_ratelimited("can't run stopped vcpu %d\n",
3400                                    vcpu->vcpu_id);
3401                 return -EINVAL;
3402         }
3403
3404         sync_regs(vcpu, kvm_run);
3405         enable_cpu_timer_accounting(vcpu);
3406
3407         might_fault();
3408         rc = __vcpu_run(vcpu);
3409
3410         if (signal_pending(current) && !rc) {
3411                 kvm_run->exit_reason = KVM_EXIT_INTR;
3412                 rc = -EINTR;
3413         }
3414
3415         if (guestdbg_exit_pending(vcpu) && !rc)  {
3416                 kvm_s390_prepare_debug_exit(vcpu);
3417                 rc = 0;
3418         }
3419
3420         if (rc == -EREMOTE) {
3421                 /* userspace support is needed, kvm_run has been prepared */
3422                 rc = 0;
3423         }
3424
3425         disable_cpu_timer_accounting(vcpu);
3426         store_regs(vcpu, kvm_run);
3427
3428         kvm_sigset_deactivate(vcpu);
3429
3430         vcpu->stat.exit_userspace++;
3431         return rc;
3432 }
3433
3434 /*
3435  * store status at address
3436  * we use have two special cases:
3437  * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit
3438  * KVM_S390_STORE_STATUS_PREFIXED: -> prefix
3439  */
3440 int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa)
3441 {
3442         unsigned char archmode = 1;
3443         freg_t fprs[NUM_FPRS];
3444         unsigned int px;
3445         u64 clkcomp, cputm;
3446         int rc;
3447
3448         px = kvm_s390_get_prefix(vcpu);
3449         if (gpa == KVM_S390_STORE_STATUS_NOADDR) {
3450                 if (write_guest_abs(vcpu, 163, &archmode, 1))
3451                         return -EFAULT;
3452                 gpa = 0;
3453         } else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) {
3454                 if (write_guest_real(vcpu, 163, &archmode, 1))
3455                         return -EFAULT;
3456                 gpa = px;
3457         } else
3458                 gpa -= __LC_FPREGS_SAVE_AREA;
3459
3460         /* manually convert vector registers if necessary */
3461         if (MACHINE_HAS_VX) {
3462                 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
3463                 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
3464                                      fprs, 128);
3465         } else {
3466                 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
3467                                      vcpu->run->s.regs.fprs, 128);
3468         }
3469         rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA,
3470                               vcpu->run->s.regs.gprs, 128);
3471         rc |= write_guest_abs(vcpu, gpa + __LC_PSW_SAVE_AREA,
3472                               &vcpu->arch.sie_block->gpsw, 16);
3473         rc |= write_guest_abs(vcpu, gpa + __LC_PREFIX_SAVE_AREA,
3474                               &px, 4);
3475         rc |= write_guest_abs(vcpu, gpa + __LC_FP_CREG_SAVE_AREA,
3476                               &vcpu->run->s.regs.fpc, 4);
3477         rc |= write_guest_abs(vcpu, gpa + __LC_TOD_PROGREG_SAVE_AREA,
3478                               &vcpu->arch.sie_block->todpr, 4);
3479         cputm = kvm_s390_get_cpu_timer(vcpu);
3480         rc |= write_guest_abs(vcpu, gpa + __LC_CPU_TIMER_SAVE_AREA,
3481                               &cputm, 8);
3482         clkcomp = vcpu->arch.sie_block->ckc >> 8;
3483         rc |= write_guest_abs(vcpu, gpa + __LC_CLOCK_COMP_SAVE_AREA,
3484                               &clkcomp, 8);
3485         rc |= write_guest_abs(vcpu, gpa + __LC_AREGS_SAVE_AREA,
3486                               &vcpu->run->s.regs.acrs, 64);
3487         rc |= write_guest_abs(vcpu, gpa + __LC_CREGS_SAVE_AREA,
3488                               &vcpu->arch.sie_block->gcr, 128);
3489         return rc ? -EFAULT : 0;
3490 }
3491
3492 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
3493 {
3494         /*
3495          * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy
3496          * switch in the run ioctl. Let's update our copies before we save
3497          * it into the save area
3498          */
3499         save_fpu_regs();
3500         vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
3501         save_access_regs(vcpu->run->s.regs.acrs);
3502
3503         return kvm_s390_store_status_unloaded(vcpu, addr);
3504 }
3505
3506 static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
3507 {
3508         kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu);
3509         kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu);
3510 }
3511
3512 static void __disable_ibs_on_all_vcpus(struct kvm *kvm)
3513 {
3514         unsigned int i;
3515         struct kvm_vcpu *vcpu;
3516
3517         kvm_for_each_vcpu(i, vcpu, kvm) {
3518                 __disable_ibs_on_vcpu(vcpu);
3519         }
3520 }
3521
3522 static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
3523 {
3524         if (!sclp.has_ibs)
3525                 return;
3526         kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu);
3527         kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu);
3528 }
3529
3530 void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu)
3531 {
3532         int i, online_vcpus, started_vcpus = 0;
3533
3534         if (!is_vcpu_stopped(vcpu))
3535                 return;
3536
3537         trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1);
3538         /* Only one cpu at a time may enter/leave the STOPPED state. */
3539         spin_lock(&vcpu->kvm->arch.start_stop_lock);
3540         online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
3541
3542         for (i = 0; i < online_vcpus; i++) {
3543                 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i]))
3544                         started_vcpus++;
3545         }
3546
3547         if (started_vcpus == 0) {
3548                 /* we're the only active VCPU -> speed it up */
3549                 __enable_ibs_on_vcpu(vcpu);
3550         } else if (started_vcpus == 1) {
3551                 /*
3552                  * As we are starting a second VCPU, we have to disable
3553                  * the IBS facility on all VCPUs to remove potentially
3554                  * oustanding ENABLE requests.
3555                  */
3556                 __disable_ibs_on_all_vcpus(vcpu->kvm);
3557         }
3558
3559         atomic_andnot(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
3560         /*
3561          * Another VCPU might have used IBS while we were offline.
3562          * Let's play safe and flush the VCPU at startup.
3563          */
3564         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
3565         spin_unlock(&vcpu->kvm->arch.start_stop_lock);
3566         return;
3567 }
3568
3569 void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu)
3570 {
3571         int i, online_vcpus, started_vcpus = 0;
3572         struct kvm_vcpu *started_vcpu = NULL;
3573
3574         if (is_vcpu_stopped(vcpu))
3575                 return;
3576
3577         trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0);
3578         /* Only one cpu at a time may enter/leave the STOPPED state. */
3579         spin_lock(&vcpu->kvm->arch.start_stop_lock);
3580         online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
3581
3582         /* SIGP STOP and SIGP STOP AND STORE STATUS has been fully processed */
3583         kvm_s390_clear_stop_irq(vcpu);
3584
3585         atomic_or(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
3586         __disable_ibs_on_vcpu(vcpu);
3587
3588         for (i = 0; i < online_vcpus; i++) {
3589                 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i])) {
3590                         started_vcpus++;
3591                         started_vcpu = vcpu->kvm->vcpus[i];
3592                 }
3593         }
3594
3595         if (started_vcpus == 1) {
3596                 /*
3597                  * As we only have one VCPU left, we want to enable the
3598                  * IBS facility for that VCPU to speed it up.
3599                  */
3600                 __enable_ibs_on_vcpu(started_vcpu);
3601         }
3602
3603         spin_unlock(&vcpu->kvm->arch.start_stop_lock);
3604         return;
3605 }
3606
3607 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
3608                                      struct kvm_enable_cap *cap)
3609 {
3610         int r;
3611
3612         if (cap->flags)
3613                 return -EINVAL;
3614
3615         switch (cap->cap) {
3616         case KVM_CAP_S390_CSS_SUPPORT:
3617                 if (!vcpu->kvm->arch.css_support) {
3618                         vcpu->kvm->arch.css_support = 1;
3619                         VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support");
3620                         trace_kvm_s390_enable_css(vcpu->kvm);
3621                 }
3622                 r = 0;
3623                 break;
3624         default:
3625                 r = -EINVAL;
3626                 break;
3627         }
3628         return r;
3629 }
3630
3631 static long kvm_s390_guest_mem_op(struct kvm_vcpu *vcpu,
3632                                   struct kvm_s390_mem_op *mop)
3633 {
3634         void __user *uaddr = (void __user *)mop->buf;
3635         void *tmpbuf = NULL;
3636         int r, srcu_idx;
3637         const u64 supported_flags = KVM_S390_MEMOP_F_INJECT_EXCEPTION
3638                                     | KVM_S390_MEMOP_F_CHECK_ONLY;
3639
3640         if (mop->flags & ~supported_flags)
3641                 return -EINVAL;
3642
3643         if (mop->size > MEM_OP_MAX_SIZE)
3644                 return -E2BIG;
3645
3646         if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) {
3647                 tmpbuf = vmalloc(mop->size);
3648                 if (!tmpbuf)
3649                         return -ENOMEM;
3650         }
3651
3652         srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
3653
3654         switch (mop->op) {
3655         case KVM_S390_MEMOP_LOGICAL_READ:
3656                 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
3657                         r = check_gva_range(vcpu, mop->gaddr, mop->ar,
3658                                             mop->size, GACC_FETCH);
3659                         break;
3660                 }
3661                 r = read_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size);
3662                 if (r == 0) {
3663                         if (copy_to_user(uaddr, tmpbuf, mop->size))
3664                                 r = -EFAULT;
3665                 }
3666                 break;
3667         case KVM_S390_MEMOP_LOGICAL_WRITE:
3668                 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
3669                         r = check_gva_range(vcpu, mop->gaddr, mop->ar,
3670                                             mop->size, GACC_STORE);
3671                         break;
3672                 }
3673                 if (copy_from_user(tmpbuf, uaddr, mop->size)) {
3674                         r = -EFAULT;
3675                         break;
3676                 }
3677                 r = write_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size);
3678                 break;
3679         default:
3680                 r = -EINVAL;
3681         }
3682
3683         srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
3684
3685         if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0)
3686                 kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
3687
3688         vfree(tmpbuf);
3689         return r;
3690 }
3691
3692 long kvm_arch_vcpu_ioctl(struct file *filp,
3693                          unsigned int ioctl, unsigned long arg)
3694 {
3695         struct kvm_vcpu *vcpu = filp->private_data;
3696         void __user *argp = (void __user *)arg;
3697         int idx;
3698         long r;
3699
3700         switch (ioctl) {
3701         case KVM_S390_IRQ: {
3702                 struct kvm_s390_irq s390irq;
3703
3704                 r = -EFAULT;
3705                 if (copy_from_user(&s390irq, argp, sizeof(s390irq)))
3706                         break;
3707                 r = kvm_s390_inject_vcpu(vcpu, &s390irq);
3708                 break;
3709         }
3710         case KVM_S390_INTERRUPT: {
3711                 struct kvm_s390_interrupt s390int;
3712                 struct kvm_s390_irq s390irq;
3713
3714                 r = -EFAULT;
3715                 if (copy_from_user(&s390int, argp, sizeof(s390int)))
3716                         break;
3717                 if (s390int_to_s390irq(&s390int, &s390irq))
3718                         return -EINVAL;
3719                 r = kvm_s390_inject_vcpu(vcpu, &s390irq);
3720                 break;
3721         }
3722         case KVM_S390_STORE_STATUS:
3723                 idx = srcu_read_lock(&vcpu->kvm->srcu);
3724                 r = kvm_s390_vcpu_store_status(vcpu, arg);
3725                 srcu_read_unlock(&vcpu->kvm->srcu, idx);
3726                 break;
3727         case KVM_S390_SET_INITIAL_PSW: {
3728                 psw_t psw;
3729
3730                 r = -EFAULT;
3731                 if (copy_from_user(&psw, argp, sizeof(psw)))
3732                         break;
3733                 r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
3734                 break;
3735         }
3736         case KVM_S390_INITIAL_RESET:
3737                 r = kvm_arch_vcpu_ioctl_initial_reset(vcpu);
3738                 break;
3739         case KVM_SET_ONE_REG:
3740         case KVM_GET_ONE_REG: {
3741                 struct kvm_one_reg reg;
3742                 r = -EFAULT;
3743                 if (copy_from_user(&reg, argp, sizeof(reg)))
3744                         break;
3745                 if (ioctl == KVM_SET_ONE_REG)
3746                         r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, &reg);
3747                 else
3748                         r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, &reg);
3749                 break;
3750         }
3751 #ifdef CONFIG_KVM_S390_UCONTROL
3752         case KVM_S390_UCAS_MAP: {
3753                 struct kvm_s390_ucas_mapping ucasmap;
3754
3755                 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
3756                         r = -EFAULT;
3757                         break;
3758                 }
3759
3760                 if (!kvm_is_ucontrol(vcpu->kvm)) {
3761                         r = -EINVAL;
3762                         break;
3763                 }
3764
3765                 r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr,
3766                                      ucasmap.vcpu_addr, ucasmap.length);
3767                 break;
3768         }
3769         case KVM_S390_UCAS_UNMAP: {
3770                 struct kvm_s390_ucas_mapping ucasmap;
3771
3772                 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
3773                         r = -EFAULT;
3774                         break;
3775                 }
3776
3777                 if (!kvm_is_ucontrol(vcpu->kvm)) {
3778                         r = -EINVAL;
3779                         break;
3780                 }
3781
3782                 r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr,
3783                         ucasmap.length);
3784                 break;
3785         }
3786 #endif
3787         case KVM_S390_VCPU_FAULT: {
3788                 r = gmap_fault(vcpu->arch.gmap, arg, 0);
3789                 break;
3790         }
3791         case KVM_ENABLE_CAP:
3792         {
3793                 struct kvm_enable_cap cap;
3794                 r = -EFAULT;
3795                 if (copy_from_user(&cap, argp, sizeof(cap)))
3796                         break;
3797                 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
3798                 break;
3799         }
3800         case KVM_S390_MEM_OP: {
3801                 struct kvm_s390_mem_op mem_op;
3802
3803                 if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0)
3804                         r = kvm_s390_guest_mem_op(vcpu, &mem_op);
3805                 else
3806                         r = -EFAULT;
3807                 break;
3808         }
3809         case KVM_S390_SET_IRQ_STATE: {
3810                 struct kvm_s390_irq_state irq_state;
3811
3812                 r = -EFAULT;
3813                 if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
3814                         break;
3815                 if (irq_state.len > VCPU_IRQS_MAX_BUF ||
3816                     irq_state.len == 0 ||
3817                     irq_state.len % sizeof(struct kvm_s390_irq) > 0) {
3818                         r = -EINVAL;
3819                         break;
3820                 }
3821                 /* do not use irq_state.flags, it will break old QEMUs */
3822                 r = kvm_s390_set_irq_state(vcpu,
3823                                            (void __user *) irq_state.buf,
3824                                            irq_state.len);
3825                 break;
3826         }
3827         case KVM_S390_GET_IRQ_STATE: {
3828                 struct kvm_s390_irq_state irq_state;
3829
3830                 r = -EFAULT;
3831                 if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
3832                         break;
3833                 if (irq_state.len == 0) {
3834                         r = -EINVAL;
3835                         break;
3836                 }
3837                 /* do not use irq_state.flags, it will break old QEMUs */
3838                 r = kvm_s390_get_irq_state(vcpu,
3839                                            (__u8 __user *)  irq_state.buf,
3840                                            irq_state.len);
3841                 break;
3842         }
3843         default:
3844                 r = -ENOTTY;
3845         }
3846         return r;
3847 }
3848
3849 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
3850 {
3851 #ifdef CONFIG_KVM_S390_UCONTROL
3852         if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET)
3853                  && (kvm_is_ucontrol(vcpu->kvm))) {
3854                 vmf->page = virt_to_page(vcpu->arch.sie_block);
3855                 get_page(vmf->page);
3856                 return 0;
3857         }
3858 #endif
3859         return VM_FAULT_SIGBUS;
3860 }
3861
3862 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
3863                             unsigned long npages)
3864 {
3865         return 0;
3866 }
3867
3868 /* Section: memory related */
3869 int kvm_arch_prepare_memory_region(struct kvm *kvm,
3870                                    struct kvm_memory_slot *memslot,
3871                                    const struct kvm_userspace_memory_region *mem,
3872                                    enum kvm_mr_change change)
3873 {
3874         /* A few sanity checks. We can have memory slots which have to be
3875            located/ended at a segment boundary (1MB). The memory in userland is
3876            ok to be fragmented into various different vmas. It is okay to mmap()
3877            and munmap() stuff in this slot after doing this call at any time */
3878
3879         if (mem->userspace_addr & 0xffffful)
3880                 return -EINVAL;
3881
3882         if (mem->memory_size & 0xffffful)
3883                 return -EINVAL;
3884
3885         if (mem->guest_phys_addr + mem->memory_size > kvm->arch.mem_limit)
3886                 return -EINVAL;
3887
3888         return 0;
3889 }
3890
3891 void kvm_arch_commit_memory_region(struct kvm *kvm,
3892                                 const struct kvm_userspace_memory_region *mem,
3893                                 const struct kvm_memory_slot *old,
3894                                 const struct kvm_memory_slot *new,
3895                                 enum kvm_mr_change change)
3896 {
3897         int rc;
3898
3899         /* If the basics of the memslot do not change, we do not want
3900          * to update the gmap. Every update causes several unnecessary
3901          * segment translation exceptions. This is usually handled just
3902          * fine by the normal fault handler + gmap, but it will also
3903          * cause faults on the prefix page of running guest CPUs.
3904          */
3905         if (old->userspace_addr == mem->userspace_addr &&
3906             old->base_gfn * PAGE_SIZE == mem->guest_phys_addr &&
3907             old->npages * PAGE_SIZE == mem->memory_size)
3908                 return;
3909
3910         rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr,
3911                 mem->guest_phys_addr, mem->memory_size);
3912         if (rc)
3913                 pr_warn("failed to commit memory region\n");
3914         return;
3915 }
3916
3917 static inline unsigned long nonhyp_mask(int i)
3918 {
3919         unsigned int nonhyp_fai = (sclp.hmfai << i * 2) >> 30;
3920
3921         return 0x0000ffffffffffffUL >> (nonhyp_fai << 4);
3922 }
3923
3924 void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu)
3925 {
3926         vcpu->valid_wakeup = false;
3927 }
3928
3929 static int __init kvm_s390_init(void)
3930 {
3931         int i;
3932
3933         if (!sclp.has_sief2) {
3934                 pr_info("SIE not available\n");
3935                 return -ENODEV;
3936         }
3937
3938         for (i = 0; i < 16; i++)
3939                 kvm_s390_fac_list_mask[i] |=
3940                         S390_lowcore.stfle_fac_list[i] & nonhyp_mask(i);
3941
3942         return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
3943 }
3944
3945 static void __exit kvm_s390_exit(void)
3946 {
3947         kvm_exit();
3948 }
3949
3950 module_init(kvm_s390_init);
3951 module_exit(kvm_s390_exit);
3952
3953 /*
3954  * Enable autoloading of the kvm module.
3955  * Note that we add the module alias here instead of virt/kvm/kvm_main.c
3956  * since x86 takes a different approach.
3957  */
3958 #include <linux/miscdevice.h>
3959 MODULE_ALIAS_MISCDEV(KVM_MINOR);
3960 MODULE_ALIAS("devname:kvm");