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, 2018
   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 #define KMSG_COMPONENT "kvm-s390"
  15 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  16
  17 #include <linux/compiler.h>
  18 #include <linux/err.h>
  19 #include <linux/fs.h>
  20 #include <linux/hrtimer.h>
  21 #include <linux/init.h>
  22 #include <linux/kvm.h>
  23 #include <linux/kvm_host.h>
  24 #include <linux/mman.h>
  25 #include <linux/module.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/random.h>
  28 #include <linux/slab.h>
  29 #include <linux/timer.h>
  30 #include <linux/vmalloc.h>
  31 #include <linux/bitmap.h>
  32 #include <linux/sched/signal.h>
  33 #include <linux/string.h>
  34
  35 #include <asm/asm-offsets.h>
  36 #include <asm/lowcore.h>
  37 #include <asm/stp.h>
  38 #include <asm/pgtable.h>
  39 #include <asm/gmap.h>
  40 #include <asm/nmi.h>
  41 #include <asm/switch_to.h>
  42 #include <asm/isc.h>
  43 #include <asm/sclp.h>
  44 #include <asm/cpacf.h>
  45 #include <asm/timex.h>
  46 #include <asm/ap.h>
  47 #include "kvm-s390.h"
  48 #include "gaccess.h"
  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 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
  61
  62 struct kvm_stats_debugfs_item debugfs_entries[] = {
  63         { "userspace_handled", VCPU_STAT(exit_userspace) },
  64         { "exit_null", VCPU_STAT(exit_null) },
  65         { "exit_validity", VCPU_STAT(exit_validity) },
  66         { "exit_stop_request", VCPU_STAT(exit_stop_request) },
  67         { "exit_external_request", VCPU_STAT(exit_external_request) },
  68         { "exit_io_request", VCPU_STAT(exit_io_request) },
  69         { "exit_external_interrupt", VCPU_STAT(exit_external_interrupt) },
  70         { "exit_instruction", VCPU_STAT(exit_instruction) },
  71         { "exit_pei", VCPU_STAT(exit_pei) },
  72         { "exit_program_interruption", VCPU_STAT(exit_program_interruption) },
  73         { "exit_instr_and_program_int", VCPU_STAT(exit_instr_and_program) },
  74         { "exit_operation_exception", VCPU_STAT(exit_operation_exception) },
  75         { "halt_successful_poll", VCPU_STAT(halt_successful_poll) },
  76         { "halt_attempted_poll", VCPU_STAT(halt_attempted_poll) },
  77         { "halt_poll_invalid", VCPU_STAT(halt_poll_invalid) },
  78         { "halt_no_poll_steal", VCPU_STAT(halt_no_poll_steal) },
  79         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
  80         { "instruction_lctlg", VCPU_STAT(instruction_lctlg) },
  81         { "instruction_lctl", VCPU_STAT(instruction_lctl) },
  82         { "instruction_stctl", VCPU_STAT(instruction_stctl) },
  83         { "instruction_stctg", VCPU_STAT(instruction_stctg) },
  84         { "deliver_ckc", VCPU_STAT(deliver_ckc) },
  85         { "deliver_cputm", VCPU_STAT(deliver_cputm) },
  86         { "deliver_emergency_signal", VCPU_STAT(deliver_emergency_signal) },
  87         { "deliver_external_call", VCPU_STAT(deliver_external_call) },
  88         { "deliver_service_signal", VCPU_STAT(deliver_service_signal) },
  89         { "deliver_virtio", VCPU_STAT(deliver_virtio) },
  90         { "deliver_stop_signal", VCPU_STAT(deliver_stop_signal) },
  91         { "deliver_prefix_signal", VCPU_STAT(deliver_prefix_signal) },
  92         { "deliver_restart_signal", VCPU_STAT(deliver_restart_signal) },
  93         { "deliver_program", VCPU_STAT(deliver_program) },
  94         { "deliver_io", VCPU_STAT(deliver_io) },
  95         { "deliver_machine_check", VCPU_STAT(deliver_machine_check) },
  96         { "exit_wait_state", VCPU_STAT(exit_wait_state) },
  97         { "inject_ckc", VCPU_STAT(inject_ckc) },
  98         { "inject_cputm", VCPU_STAT(inject_cputm) },
  99         { "inject_external_call", VCPU_STAT(inject_external_call) },
 100         { "inject_float_mchk", VM_STAT(inject_float_mchk) },
 101         { "inject_emergency_signal", VCPU_STAT(inject_emergency_signal) },
 102         { "inject_io", VM_STAT(inject_io) },
 103         { "inject_mchk", VCPU_STAT(inject_mchk) },
 104         { "inject_pfault_done", VM_STAT(inject_pfault_done) },
 105         { "inject_program", VCPU_STAT(inject_program) },
 106         { "inject_restart", VCPU_STAT(inject_restart) },
 107         { "inject_service_signal", VM_STAT(inject_service_signal) },
 108         { "inject_set_prefix", VCPU_STAT(inject_set_prefix) },
 109         { "inject_stop_signal", VCPU_STAT(inject_stop_signal) },
 110         { "inject_pfault_init", VCPU_STAT(inject_pfault_init) },
 111         { "inject_virtio", VM_STAT(inject_virtio) },
 112         { "instruction_epsw", VCPU_STAT(instruction_epsw) },
 113         { "instruction_gs", VCPU_STAT(instruction_gs) },
 114         { "instruction_io_other", VCPU_STAT(instruction_io_other) },
 115         { "instruction_lpsw", VCPU_STAT(instruction_lpsw) },
 116         { "instruction_lpswe", VCPU_STAT(instruction_lpswe) },
 117         { "instruction_pfmf", VCPU_STAT(instruction_pfmf) },
 118         { "instruction_ptff", VCPU_STAT(instruction_ptff) },
 119         { "instruction_stidp", VCPU_STAT(instruction_stidp) },
 120         { "instruction_sck", VCPU_STAT(instruction_sck) },
 121         { "instruction_sckpf", VCPU_STAT(instruction_sckpf) },
 122         { "instruction_spx", VCPU_STAT(instruction_spx) },
 123         { "instruction_stpx", VCPU_STAT(instruction_stpx) },
 124         { "instruction_stap", VCPU_STAT(instruction_stap) },
 125         { "instruction_iske", VCPU_STAT(instruction_iske) },
 126         { "instruction_ri", VCPU_STAT(instruction_ri) },
 127         { "instruction_rrbe", VCPU_STAT(instruction_rrbe) },
 128         { "instruction_sske", VCPU_STAT(instruction_sske) },
 129         { "instruction_ipte_interlock", VCPU_STAT(instruction_ipte_interlock) },
 130         { "instruction_essa", VCPU_STAT(instruction_essa) },
 131         { "instruction_stsi", VCPU_STAT(instruction_stsi) },
 132         { "instruction_stfl", VCPU_STAT(instruction_stfl) },
 133         { "instruction_tb", VCPU_STAT(instruction_tb) },
 134         { "instruction_tpi", VCPU_STAT(instruction_tpi) },
 135         { "instruction_tprot", VCPU_STAT(instruction_tprot) },
 136         { "instruction_tsch", VCPU_STAT(instruction_tsch) },
 137         { "instruction_sthyi", VCPU_STAT(instruction_sthyi) },
 138         { "instruction_sie", VCPU_STAT(instruction_sie) },
 139         { "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) },
 140         { "instruction_sigp_sense_running", VCPU_STAT(instruction_sigp_sense_running) },
 141         { "instruction_sigp_external_call", VCPU_STAT(instruction_sigp_external_call) },
 142         { "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) },
 143         { "instruction_sigp_cond_emergency", VCPU_STAT(instruction_sigp_cond_emergency) },
 144         { "instruction_sigp_start", VCPU_STAT(instruction_sigp_start) },
 145         { "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) },
 146         { "instruction_sigp_stop_store_status", VCPU_STAT(instruction_sigp_stop_store_status) },
 147         { "instruction_sigp_store_status", VCPU_STAT(instruction_sigp_store_status) },
 148         { "instruction_sigp_store_adtl_status", VCPU_STAT(instruction_sigp_store_adtl_status) },
 149         { "instruction_sigp_set_arch", VCPU_STAT(instruction_sigp_arch) },
 150         { "instruction_sigp_set_prefix", VCPU_STAT(instruction_sigp_prefix) },
 151         { "instruction_sigp_restart", VCPU_STAT(instruction_sigp_restart) },
 152         { "instruction_sigp_cpu_reset", VCPU_STAT(instruction_sigp_cpu_reset) },
 153         { "instruction_sigp_init_cpu_reset", VCPU_STAT(instruction_sigp_init_cpu_reset) },
 154         { "instruction_sigp_unknown", VCPU_STAT(instruction_sigp_unknown) },
 155         { "instruction_diag_10", VCPU_STAT(diagnose_10) },
 156         { "instruction_diag_44", VCPU_STAT(diagnose_44) },
 157         { "instruction_diag_9c", VCPU_STAT(diagnose_9c) },
 158         { "diag_9c_ignored", VCPU_STAT(diagnose_9c_ignored) },
 159         { "instruction_diag_258", VCPU_STAT(diagnose_258) },
 160         { "instruction_diag_308", VCPU_STAT(diagnose_308) },
 161         { "instruction_diag_500", VCPU_STAT(diagnose_500) },
 162         { "instruction_diag_other", VCPU_STAT(diagnose_other) },
 163         { NULL }
 164 };
 165
 166 struct kvm_s390_tod_clock_ext {
 167         __u8 epoch_idx;
 168         __u64 tod;
 169         __u8 reserved[7];
 170 } __packed;
 171
 172 /* allow nested virtualization in KVM (if enabled by user space) */
 173 static int nested;
 174 module_param(nested, int, S_IRUGO);
 175 MODULE_PARM_DESC(nested, "Nested virtualization support");
 176
 177 /* allow 1m huge page guest backing, if !nested */
 178 static int hpage;
 179 module_param(hpage, int, 0444);
 180 MODULE_PARM_DESC(hpage, "1m huge page backing support");
 181
 182 /* maximum percentage of steal time for polling.  >100 is treated like 100 */
 183 static u8 halt_poll_max_steal = 10;
 184 module_param(halt_poll_max_steal, byte, 0644);
 185 MODULE_PARM_DESC(halt_poll_max_steal, "Maximum percentage of steal time to allow polling");
 186
 187 /*
 188  * For now we handle at most 16 double words as this is what the s390 base
 189  * kernel handles and stores in the prefix page. If we ever need to go beyond
 190  * this, this requires changes to code, but the external uapi can stay.
 191  */
 192 #define SIZE_INTERNAL 16
 193
 194 /*
 195  * Base feature mask that defines default mask for facilities. Consists of the
 196  * defines in FACILITIES_KVM and the non-hypervisor managed bits.
 197  */
 198 static unsigned long kvm_s390_fac_base[SIZE_INTERNAL] = { FACILITIES_KVM };
 199 /*
 200  * Extended feature mask. Consists of the defines in FACILITIES_KVM_CPUMODEL
 201  * and defines the facilities that can be enabled via a cpu model.
 202  */
 203 static unsigned long kvm_s390_fac_ext[SIZE_INTERNAL] = { FACILITIES_KVM_CPUMODEL };
 204
 205 static unsigned long kvm_s390_fac_size(void)
 206 {
 207         BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_MASK_SIZE_U64);
 208         BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_LIST_SIZE_U64);
 209         BUILD_BUG_ON(SIZE_INTERNAL * sizeof(unsigned long) >
 210                 sizeof(S390_lowcore.stfle_fac_list));
 211
 212         return SIZE_INTERNAL;
 213 }
 214
 215 /* available cpu features supported by kvm */
 216 static DECLARE_BITMAP(kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
 217 /* available subfunctions indicated via query / "test bit" */
 218 static struct kvm_s390_vm_cpu_subfunc kvm_s390_available_subfunc;
 219
 220 static struct gmap_notifier gmap_notifier;
 221 static struct gmap_notifier vsie_gmap_notifier;
 222 debug_info_t *kvm_s390_dbf;
 223
 224 /* Section: not file related */
 225 int kvm_arch_hardware_enable(void)
 226 {
 227         /* every s390 is virtualization enabled ;-) */
 228         return 0;
 229 }
 230
 231 int kvm_arch_check_processor_compat(void)
 232 {
 233         return 0;
 234 }
 235
 236 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
 237                               unsigned long end);
 238
 239 static void kvm_clock_sync_scb(struct kvm_s390_sie_block *scb, u64 delta)
 240 {
 241         u8 delta_idx = 0;
 242
 243         /*
 244          * The TOD jumps by delta, we have to compensate this by adding
 245          * -delta to the epoch.
 246          */
 247         delta = -delta;
 248
 249         /* sign-extension - we're adding to signed values below */
 250         if ((s64)delta < 0)
 251                 delta_idx = -1;
 252
 253         scb->epoch += delta;
 254         if (scb->ecd & ECD_MEF) {
 255                 scb->epdx += delta_idx;
 256                 if (scb->epoch < delta)
 257                         scb->epdx += 1;
 258         }
 259 }
 260
 261 /*
 262  * This callback is executed during stop_machine(). All CPUs are therefore
 263  * temporarily stopped. In order not to change guest behavior, we have to
 264  * disable preemption whenever we touch the epoch of kvm and the VCPUs,
 265  * so a CPU won't be stopped while calculating with the epoch.
 266  */
 267 static int kvm_clock_sync(struct notifier_block *notifier, unsigned long val,
 268                           void *v)
 269 {
 270         struct kvm *kvm;
 271         struct kvm_vcpu *vcpu;
 272         int i;
 273         unsigned long long *delta = v;
 274
 275         list_for_each_entry(kvm, &vm_list, vm_list) {
 276                 kvm_for_each_vcpu(i, vcpu, kvm) {
 277                         kvm_clock_sync_scb(vcpu->arch.sie_block, *delta);
 278                         if (i == 0) {
 279                                 kvm->arch.epoch = vcpu->arch.sie_block->epoch;
 280                                 kvm->arch.epdx = vcpu->arch.sie_block->epdx;
 281                         }
 282                         if (vcpu->arch.cputm_enabled)
 283                                 vcpu->arch.cputm_start += *delta;
 284                         if (vcpu->arch.vsie_block)
 285                                 kvm_clock_sync_scb(vcpu->arch.vsie_block,
 286                                                    *delta);
 287                 }
 288         }
 289         return NOTIFY_OK;
 290 }
 291
 292 static struct notifier_block kvm_clock_notifier = {
 293         .notifier_call = kvm_clock_sync,
 294 };
 295
 296 int kvm_arch_hardware_setup(void)
 297 {
 298         gmap_notifier.notifier_call = kvm_gmap_notifier;
 299         gmap_register_pte_notifier(&gmap_notifier);
 300         vsie_gmap_notifier.notifier_call = kvm_s390_vsie_gmap_notifier;
 301         gmap_register_pte_notifier(&vsie_gmap_notifier);
 302         atomic_notifier_chain_register(&s390_epoch_delta_notifier,
 303                                        &kvm_clock_notifier);
 304         return 0;
 305 }
 306
 307 void kvm_arch_hardware_unsetup(void)
 308 {
 309         gmap_unregister_pte_notifier(&gmap_notifier);
 310         gmap_unregister_pte_notifier(&vsie_gmap_notifier);
 311         atomic_notifier_chain_unregister(&s390_epoch_delta_notifier,
 312                                          &kvm_clock_notifier);
 313 }
 314
 315 static void allow_cpu_feat(unsigned long nr)
 316 {
 317         set_bit_inv(nr, kvm_s390_available_cpu_feat);
 318 }
 319
 320 static inline int plo_test_bit(unsigned char nr)
 321 {
 322         register unsigned long r0 asm("0") = (unsigned long) nr | 0x100;
 323         int cc;
 324
 325         asm volatile(
 326                 /* Parameter registers are ignored for "test bit" */
 327                 "       plo     0,0,0,0(0)\n"
 328                 "       ipm     %0\n"
 329                 "       srl     %0,28\n"
 330                 : "=d" (cc)
 331                 : "d" (r0)
 332                 : "cc");
 333         return cc == 0;
 334 }
 335
 336 static __always_inline void __insn32_query(unsigned int opcode, u8 *query)
 337 {
 338         register unsigned long r0 asm("0") = 0; /* query function */
 339         register unsigned long r1 asm("1") = (unsigned long) query;
 340
 341         asm volatile(
 342                 /* Parameter regs are ignored */
 343                 "       .insn   rrf,%[opc] << 16,2,4,6,0\n"
 344                 :
 345                 : "d" (r0), "a" (r1), [opc] "i" (opcode)
 346                 : "cc", "memory");
 347 }
 348
 349 #define INSN_SORTL 0xb938
 350 #define INSN_DFLTCC 0xb939
 351
 352 static void kvm_s390_cpu_feat_init(void)
 353 {
 354         int i;
 355
 356         for (i = 0; i < 256; ++i) {
 357                 if (plo_test_bit(i))
 358                         kvm_s390_available_subfunc.plo[i >> 3] |= 0x80 >> (i & 7);
 359         }
 360
 361         if (test_facility(28)) /* TOD-clock steering */
 362                 ptff(kvm_s390_available_subfunc.ptff,
 363                      sizeof(kvm_s390_available_subfunc.ptff),
 364                      PTFF_QAF);
 365
 366         if (test_facility(17)) { /* MSA */
 367                 __cpacf_query(CPACF_KMAC, (cpacf_mask_t *)
 368                               kvm_s390_available_subfunc.kmac);
 369                 __cpacf_query(CPACF_KMC, (cpacf_mask_t *)
 370                               kvm_s390_available_subfunc.kmc);
 371                 __cpacf_query(CPACF_KM, (cpacf_mask_t *)
 372                               kvm_s390_available_subfunc.km);
 373                 __cpacf_query(CPACF_KIMD, (cpacf_mask_t *)
 374                               kvm_s390_available_subfunc.kimd);
 375                 __cpacf_query(CPACF_KLMD, (cpacf_mask_t *)
 376                               kvm_s390_available_subfunc.klmd);
 377         }
 378         if (test_facility(76)) /* MSA3 */
 379                 __cpacf_query(CPACF_PCKMO, (cpacf_mask_t *)
 380                               kvm_s390_available_subfunc.pckmo);
 381         if (test_facility(77)) { /* MSA4 */
 382                 __cpacf_query(CPACF_KMCTR, (cpacf_mask_t *)
 383                               kvm_s390_available_subfunc.kmctr);
 384                 __cpacf_query(CPACF_KMF, (cpacf_mask_t *)
 385                               kvm_s390_available_subfunc.kmf);
 386                 __cpacf_query(CPACF_KMO, (cpacf_mask_t *)
 387                               kvm_s390_available_subfunc.kmo);
 388                 __cpacf_query(CPACF_PCC, (cpacf_mask_t *)
 389                               kvm_s390_available_subfunc.pcc);
 390         }
 391         if (test_facility(57)) /* MSA5 */
 392                 __cpacf_query(CPACF_PRNO, (cpacf_mask_t *)
 393                               kvm_s390_available_subfunc.ppno);
 394
 395         if (test_facility(146)) /* MSA8 */
 396                 __cpacf_query(CPACF_KMA, (cpacf_mask_t *)
 397                               kvm_s390_available_subfunc.kma);
 398
 399         if (test_facility(155)) /* MSA9 */
 400                 __cpacf_query(CPACF_KDSA, (cpacf_mask_t *)
 401                               kvm_s390_available_subfunc.kdsa);
 402
 403         if (test_facility(150)) /* SORTL */
 404                 __insn32_query(INSN_SORTL, kvm_s390_available_subfunc.sortl);
 405
 406         if (test_facility(151)) /* DFLTCC */
 407                 __insn32_query(INSN_DFLTCC, kvm_s390_available_subfunc.dfltcc);
 408
 409         if (MACHINE_HAS_ESOP)
 410                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP);
 411         /*
 412          * We need SIE support, ESOP (PROT_READ protection for gmap_shadow),
 413          * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing).
 414          */
 415         if (!sclp.has_sief2 || !MACHINE_HAS_ESOP || !sclp.has_64bscao ||
 416             !test_facility(3) || !nested)
 417                 return;
 418         allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2);
 419         if (sclp.has_64bscao)
 420                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO);
 421         if (sclp.has_siif)
 422                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF);
 423         if (sclp.has_gpere)
 424                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GPERE);
 425         if (sclp.has_gsls)
 426                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GSLS);
 427         if (sclp.has_ib)
 428                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IB);
 429         if (sclp.has_cei)
 430                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_CEI);
 431         if (sclp.has_ibs)
 432                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IBS);
 433         if (sclp.has_kss)
 434                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_KSS);
 435         /*
 436          * KVM_S390_VM_CPU_FEAT_SKEY: Wrong shadow of PTE.I bits will make
 437          * all skey handling functions read/set the skey from the PGSTE
 438          * instead of the real storage key.
 439          *
 440          * KVM_S390_VM_CPU_FEAT_CMMA: Wrong shadow of PTE.I bits will make
 441          * pages being detected as preserved although they are resident.
 442          *
 443          * KVM_S390_VM_CPU_FEAT_PFMFI: Wrong shadow of PTE.I bits will
 444          * have the same effect as for KVM_S390_VM_CPU_FEAT_SKEY.
 445          *
 446          * For KVM_S390_VM_CPU_FEAT_SKEY, KVM_S390_VM_CPU_FEAT_CMMA and
 447          * KVM_S390_VM_CPU_FEAT_PFMFI, all PTE.I and PGSTE bits have to be
 448          * correctly shadowed. We can do that for the PGSTE but not for PTE.I.
 449          *
 450          * KVM_S390_VM_CPU_FEAT_SIGPIF: Wrong SCB addresses in the SCA. We
 451          * cannot easily shadow the SCA because of the ipte lock.
 452          */
 453 }
 454
 455 int kvm_arch_init(void *opaque)
 456 {
 457         int rc = -ENOMEM;
 458
 459         kvm_s390_dbf = debug_register("kvm-trace", 32, 1, 7 * sizeof(long));
 460         if (!kvm_s390_dbf)
 461                 return -ENOMEM;
 462
 463         if (debug_register_view(kvm_s390_dbf, &debug_sprintf_view))
 464                 goto out;
 465
 466         kvm_s390_cpu_feat_init();
 467
 468         /* Register floating interrupt controller interface. */
 469         rc = kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC);
 470         if (rc) {
 471                 pr_err("A FLIC registration call failed with rc=%d\n", rc);
 472                 goto out;
 473         }
 474
 475         rc = kvm_s390_gib_init(GAL_ISC);
 476         if (rc)
 477                 goto out;
 478
 479         return 0;
 480
 481 out:
 482         kvm_arch_exit();
 483         return rc;
 484 }
 485
 486 void kvm_arch_exit(void)
 487 {
 488         kvm_s390_gib_destroy();
 489         debug_unregister(kvm_s390_dbf);
 490 }
 491
 492 /* Section: device related */
 493 long kvm_arch_dev_ioctl(struct file *filp,
 494                         unsigned int ioctl, unsigned long arg)
 495 {
 496         if (ioctl == KVM_S390_ENABLE_SIE)
 497                 return s390_enable_sie();
 498         return -EINVAL;
 499 }
 500
 501 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 502 {
 503         int r;
 504
 505         switch (ext) {
 506         case KVM_CAP_S390_PSW:
 507         case KVM_CAP_S390_GMAP:
 508         case KVM_CAP_SYNC_MMU:
 509 #ifdef CONFIG_KVM_S390_UCONTROL
 510         case KVM_CAP_S390_UCONTROL:
 511 #endif
 512         case KVM_CAP_ASYNC_PF:
 513         case KVM_CAP_SYNC_REGS:
 514         case KVM_CAP_ONE_REG:
 515         case KVM_CAP_ENABLE_CAP:
 516         case KVM_CAP_S390_CSS_SUPPORT:
 517         case KVM_CAP_IOEVENTFD:
 518         case KVM_CAP_DEVICE_CTRL:
 519         case KVM_CAP_S390_IRQCHIP:
 520         case KVM_CAP_VM_ATTRIBUTES:
 521         case KVM_CAP_MP_STATE:
 522         case KVM_CAP_IMMEDIATE_EXIT:
 523         case KVM_CAP_S390_INJECT_IRQ:
 524         case KVM_CAP_S390_USER_SIGP:
 525         case KVM_CAP_S390_USER_STSI:
 526         case KVM_CAP_S390_SKEYS:
 527         case KVM_CAP_S390_IRQ_STATE:
 528         case KVM_CAP_S390_USER_INSTR0:
 529         case KVM_CAP_S390_CMMA_MIGRATION:
 530         case KVM_CAP_S390_AIS:
 531         case KVM_CAP_S390_AIS_MIGRATION:
 532         case KVM_CAP_S390_VCPU_RESETS:
 533                 r = 1;
 534                 break;
 535         case KVM_CAP_S390_HPAGE_1M:
 536                 r = 0;
 537                 if (hpage && !kvm_is_ucontrol(kvm))
 538                         r = 1;
 539                 break;
 540         case KVM_CAP_S390_MEM_OP:
 541                 r = MEM_OP_MAX_SIZE;
 542                 break;
 543         case KVM_CAP_NR_VCPUS:
 544         case KVM_CAP_MAX_VCPUS:
 545         case KVM_CAP_MAX_VCPU_ID:
 546                 r = KVM_S390_BSCA_CPU_SLOTS;
 547                 if (!kvm_s390_use_sca_entries())
 548                         r = KVM_MAX_VCPUS;
 549                 else if (sclp.has_esca && sclp.has_64bscao)
 550                         r = KVM_S390_ESCA_CPU_SLOTS;
 551                 break;
 552         case KVM_CAP_S390_COW:
 553                 r = MACHINE_HAS_ESOP;
 554                 break;
 555         case KVM_CAP_S390_VECTOR_REGISTERS:
 556                 r = MACHINE_HAS_VX;
 557                 break;
 558         case KVM_CAP_S390_RI:
 559                 r = test_facility(64);
 560                 break;
 561         case KVM_CAP_S390_GS:
 562                 r = test_facility(133);
 563                 break;
 564         case KVM_CAP_S390_BPB:
 565                 r = test_facility(82);
 566                 break;
 567         default:
 568                 r = 0;
 569         }
 570         return r;
 571 }
 572
 573 static void kvm_s390_sync_dirty_log(struct kvm *kvm,
 574                                     struct kvm_memory_slot *memslot)
 575 {
 576         int i;
 577         gfn_t cur_gfn, last_gfn;
 578         unsigned long gaddr, vmaddr;
 579         struct gmap *gmap = kvm->arch.gmap;
 580         DECLARE_BITMAP(bitmap, _PAGE_ENTRIES);
 581
 582         /* Loop over all guest segments */
 583         cur_gfn = memslot->base_gfn;
 584         last_gfn = memslot->base_gfn + memslot->npages;
 585         for (; cur_gfn <= last_gfn; cur_gfn += _PAGE_ENTRIES) {
 586                 gaddr = gfn_to_gpa(cur_gfn);
 587                 vmaddr = gfn_to_hva_memslot(memslot, cur_gfn);
 588                 if (kvm_is_error_hva(vmaddr))
 589                         continue;
 590
 591                 bitmap_zero(bitmap, _PAGE_ENTRIES);
 592                 gmap_sync_dirty_log_pmd(gmap, bitmap, gaddr, vmaddr);
 593                 for (i = 0; i < _PAGE_ENTRIES; i++) {
 594                         if (test_bit(i, bitmap))
 595                                 mark_page_dirty(kvm, cur_gfn + i);
 596                 }
 597
 598                 if (fatal_signal_pending(current))
 599                         return;
 600                 cond_resched();
 601         }
 602 }
 603
 604 /* Section: vm related */
 605 static void sca_del_vcpu(struct kvm_vcpu *vcpu);
 606
 607 /*
 608  * Get (and clear) the dirty memory log for a memory slot.
 609  */
 610 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 611                                struct kvm_dirty_log *log)
 612 {
 613         int r;
 614         unsigned long n;
 615         struct kvm_memslots *slots;
 616         struct kvm_memory_slot *memslot;
 617         int is_dirty = 0;
 618
 619         if (kvm_is_ucontrol(kvm))
 620                 return -EINVAL;
 621
 622         mutex_lock(&kvm->slots_lock);
 623
 624         r = -EINVAL;
 625         if (log->slot >= KVM_USER_MEM_SLOTS)
 626                 goto out;
 627
 628         slots = kvm_memslots(kvm);
 629         memslot = id_to_memslot(slots, log->slot);
 630         r = -ENOENT;
 631         if (!memslot->dirty_bitmap)
 632                 goto out;
 633
 634         kvm_s390_sync_dirty_log(kvm, memslot);
 635         r = kvm_get_dirty_log(kvm, log, &is_dirty);
 636         if (r)
 637                 goto out;
 638
 639         /* Clear the dirty log */
 640         if (is_dirty) {
 641                 n = kvm_dirty_bitmap_bytes(memslot);
 642                 memset(memslot->dirty_bitmap, 0, n);
 643         }
 644         r = 0;
 645 out:
 646         mutex_unlock(&kvm->slots_lock);
 647         return r;
 648 }
 649
 650 static void icpt_operexc_on_all_vcpus(struct kvm *kvm)
 651 {
 652         unsigned int i;
 653         struct kvm_vcpu *vcpu;
 654
 655         kvm_for_each_vcpu(i, vcpu, kvm) {
 656                 kvm_s390_sync_request(KVM_REQ_ICPT_OPEREXC, vcpu);
 657         }
 658 }
 659
 660 int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
 661 {
 662         int r;
 663
 664         if (cap->flags)
 665                 return -EINVAL;
 666
 667         switch (cap->cap) {
 668         case KVM_CAP_S390_IRQCHIP:
 669                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP");
 670                 kvm->arch.use_irqchip = 1;
 671                 r = 0;
 672                 break;
 673         case KVM_CAP_S390_USER_SIGP:
 674                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP");
 675                 kvm->arch.user_sigp = 1;
 676                 r = 0;
 677                 break;
 678         case KVM_CAP_S390_VECTOR_REGISTERS:
 679                 mutex_lock(&kvm->lock);
 680                 if (kvm->created_vcpus) {
 681                         r = -EBUSY;
 682                 } else if (MACHINE_HAS_VX) {
 683                         set_kvm_facility(kvm->arch.model.fac_mask, 129);
 684                         set_kvm_facility(kvm->arch.model.fac_list, 129);
 685                         if (test_facility(134)) {
 686                                 set_kvm_facility(kvm->arch.model.fac_mask, 134);
 687                                 set_kvm_facility(kvm->arch.model.fac_list, 134);
 688                         }
 689                         if (test_facility(135)) {
 690                                 set_kvm_facility(kvm->arch.model.fac_mask, 135);
 691                                 set_kvm_facility(kvm->arch.model.fac_list, 135);
 692                         }
 693                         if (test_facility(148)) {
 694                                 set_kvm_facility(kvm->arch.model.fac_mask, 148);
 695                                 set_kvm_facility(kvm->arch.model.fac_list, 148);
 696                         }
 697                         if (test_facility(152)) {
 698                                 set_kvm_facility(kvm->arch.model.fac_mask, 152);
 699                                 set_kvm_facility(kvm->arch.model.fac_list, 152);
 700                         }
 701                         r = 0;
 702                 } else
 703                         r = -EINVAL;
 704                 mutex_unlock(&kvm->lock);
 705                 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s",
 706                          r ? "(not available)" : "(success)");
 707                 break;
 708         case KVM_CAP_S390_RI:
 709                 r = -EINVAL;
 710                 mutex_lock(&kvm->lock);
 711                 if (kvm->created_vcpus) {
 712                         r = -EBUSY;
 713                 } else if (test_facility(64)) {
 714                         set_kvm_facility(kvm->arch.model.fac_mask, 64);
 715                         set_kvm_facility(kvm->arch.model.fac_list, 64);
 716                         r = 0;
 717                 }
 718                 mutex_unlock(&kvm->lock);
 719                 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s",
 720                          r ? "(not available)" : "(success)");
 721                 break;
 722         case KVM_CAP_S390_AIS:
 723                 mutex_lock(&kvm->lock);
 724                 if (kvm->created_vcpus) {
 725                         r = -EBUSY;
 726                 } else {
 727                         set_kvm_facility(kvm->arch.model.fac_mask, 72);
 728                         set_kvm_facility(kvm->arch.model.fac_list, 72);
 729                         r = 0;
 730                 }
 731                 mutex_unlock(&kvm->lock);
 732                 VM_EVENT(kvm, 3, "ENABLE: AIS %s",
 733                          r ? "(not available)" : "(success)");
 734                 break;
 735         case KVM_CAP_S390_GS:
 736                 r = -EINVAL;
 737                 mutex_lock(&kvm->lock);
 738                 if (kvm->created_vcpus) {
 739                         r = -EBUSY;
 740                 } else if (test_facility(133)) {
 741                         set_kvm_facility(kvm->arch.model.fac_mask, 133);
 742                         set_kvm_facility(kvm->arch.model.fac_list, 133);
 743                         r = 0;
 744                 }
 745                 mutex_unlock(&kvm->lock);
 746                 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_GS %s",
 747                          r ? "(not available)" : "(success)");
 748                 break;
 749         case KVM_CAP_S390_HPAGE_1M:
 750                 mutex_lock(&kvm->lock);
 751                 if (kvm->created_vcpus)
 752                         r = -EBUSY;
 753                 else if (!hpage || kvm->arch.use_cmma || kvm_is_ucontrol(kvm))
 754                         r = -EINVAL;
 755                 else {
 756                         r = 0;
 757                         down_write(&kvm->mm->mmap_sem);
 758                         kvm->mm->context.allow_gmap_hpage_1m = 1;
 759                         up_write(&kvm->mm->mmap_sem);
 760                         /*
 761                          * We might have to create fake 4k page
 762                          * tables. To avoid that the hardware works on
 763                          * stale PGSTEs, we emulate these instructions.
 764                          */
 765                         kvm->arch.use_skf = 0;
 766                         kvm->arch.use_pfmfi = 0;
 767                 }
 768                 mutex_unlock(&kvm->lock);
 769                 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_HPAGE %s",
 770                          r ? "(not available)" : "(success)");
 771                 break;
 772         case KVM_CAP_S390_USER_STSI:
 773                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI");
 774                 kvm->arch.user_stsi = 1;
 775                 r = 0;
 776                 break;
 777         case KVM_CAP_S390_USER_INSTR0:
 778                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_INSTR0");
 779                 kvm->arch.user_instr0 = 1;
 780                 icpt_operexc_on_all_vcpus(kvm);
 781                 r = 0;
 782                 break;
 783         default:
 784                 r = -EINVAL;
 785                 break;
 786         }
 787         return r;
 788 }
 789
 790 static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
 791 {
 792         int ret;
 793
 794         switch (attr->attr) {
 795         case KVM_S390_VM_MEM_LIMIT_SIZE:
 796                 ret = 0;
 797                 VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes",
 798                          kvm->arch.mem_limit);
 799                 if (put_user(kvm->arch.mem_limit, (u64 __user *)attr->addr))
 800                         ret = -EFAULT;
 801                 break;
 802         default:
 803                 ret = -ENXIO;
 804                 break;
 805         }
 806         return ret;
 807 }
 808
 809 static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
 810 {
 811         int ret;
 812         unsigned int idx;
 813         switch (attr->attr) {
 814         case KVM_S390_VM_MEM_ENABLE_CMMA:
 815                 ret = -ENXIO;
 816                 if (!sclp.has_cmma)
 817                         break;
 818
 819                 VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support");
 820                 mutex_lock(&kvm->lock);
 821                 if (kvm->created_vcpus)
 822                         ret = -EBUSY;
 823                 else if (kvm->mm->context.allow_gmap_hpage_1m)
 824                         ret = -EINVAL;
 825                 else {
 826                         kvm->arch.use_cmma = 1;
 827                         /* Not compatible with cmma. */
 828                         kvm->arch.use_pfmfi = 0;
 829                         ret = 0;
 830                 }
 831                 mutex_unlock(&kvm->lock);
 832                 break;
 833         case KVM_S390_VM_MEM_CLR_CMMA:
 834                 ret = -ENXIO;
 835                 if (!sclp.has_cmma)
 836                         break;
 837                 ret = -EINVAL;
 838                 if (!kvm->arch.use_cmma)
 839                         break;
 840
 841                 VM_EVENT(kvm, 3, "%s", "RESET: CMMA states");
 842                 mutex_lock(&kvm->lock);
 843                 idx = srcu_read_lock(&kvm->srcu);
 844                 s390_reset_cmma(kvm->arch.gmap->mm);
 845                 srcu_read_unlock(&kvm->srcu, idx);
 846                 mutex_unlock(&kvm->lock);
 847                 ret = 0;
 848                 break;
 849         case KVM_S390_VM_MEM_LIMIT_SIZE: {
 850                 unsigned long new_limit;
 851
 852                 if (kvm_is_ucontrol(kvm))
 853                         return -EINVAL;
 854
 855                 if (get_user(new_limit, (u64 __user *)attr->addr))
 856                         return -EFAULT;
 857
 858                 if (kvm->arch.mem_limit != KVM_S390_NO_MEM_LIMIT &&
 859                     new_limit > kvm->arch.mem_limit)
 860                         return -E2BIG;
 861
 862                 if (!new_limit)
 863                         return -EINVAL;
 864
 865                 /* gmap_create takes last usable address */
 866                 if (new_limit != KVM_S390_NO_MEM_LIMIT)
 867                         new_limit -= 1;
 868
 869                 ret = -EBUSY;
 870                 mutex_lock(&kvm->lock);
 871                 if (!kvm->created_vcpus) {
 872                         /* gmap_create will round the limit up */
 873                         struct gmap *new = gmap_create(current->mm, new_limit);
 874
 875                         if (!new) {
 876                                 ret = -ENOMEM;
 877                         } else {
 878                                 gmap_remove(kvm->arch.gmap);
 879                                 new->private = kvm;
 880                                 kvm->arch.gmap = new;
 881                                 ret = 0;
 882                         }
 883                 }
 884                 mutex_unlock(&kvm->lock);
 885                 VM_EVENT(kvm, 3, "SET: max guest address: %lu", new_limit);
 886                 VM_EVENT(kvm, 3, "New guest asce: 0x%pK",
 887                          (void *) kvm->arch.gmap->asce);
 888                 break;
 889         }
 890         default:
 891                 ret = -ENXIO;
 892                 break;
 893         }
 894         return ret;
 895 }
 896
 897 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu);
 898
 899 void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm)
 900 {
 901         struct kvm_vcpu *vcpu;
 902         int i;
 903
 904         kvm_s390_vcpu_block_all(kvm);
 905
 906         kvm_for_each_vcpu(i, vcpu, kvm) {
 907                 kvm_s390_vcpu_crypto_setup(vcpu);
 908                 /* recreate the shadow crycb by leaving the VSIE handler */
 909                 kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu);
 910         }
 911
 912         kvm_s390_vcpu_unblock_all(kvm);
 913 }
 914
 915 static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
 916 {
 917         mutex_lock(&kvm->lock);
 918         switch (attr->attr) {
 919         case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
 920                 if (!test_kvm_facility(kvm, 76)) {
 921                         mutex_unlock(&kvm->lock);
 922                         return -EINVAL;
 923                 }
 924                 get_random_bytes(
 925                         kvm->arch.crypto.crycb->aes_wrapping_key_mask,
 926                         sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
 927                 kvm->arch.crypto.aes_kw = 1;
 928                 VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support");
 929                 break;
 930         case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
 931                 if (!test_kvm_facility(kvm, 76)) {
 932                         mutex_unlock(&kvm->lock);
 933                         return -EINVAL;
 934                 }
 935                 get_random_bytes(
 936                         kvm->arch.crypto.crycb->dea_wrapping_key_mask,
 937                         sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
 938                 kvm->arch.crypto.dea_kw = 1;
 939                 VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support");
 940                 break;
 941         case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
 942                 if (!test_kvm_facility(kvm, 76)) {
 943                         mutex_unlock(&kvm->lock);
 944                         return -EINVAL;
 945                 }
 946                 kvm->arch.crypto.aes_kw = 0;
 947                 memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0,
 948                         sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
 949                 VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support");
 950                 break;
 951         case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
 952                 if (!test_kvm_facility(kvm, 76)) {
 953                         mutex_unlock(&kvm->lock);
 954                         return -EINVAL;
 955                 }
 956                 kvm->arch.crypto.dea_kw = 0;
 957                 memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0,
 958                         sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
 959                 VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support");
 960                 break;
 961         case KVM_S390_VM_CRYPTO_ENABLE_APIE:
 962                 if (!ap_instructions_available()) {
 963                         mutex_unlock(&kvm->lock);
 964                         return -EOPNOTSUPP;
 965                 }
 966                 kvm->arch.crypto.apie = 1;
 967                 break;
 968         case KVM_S390_VM_CRYPTO_DISABLE_APIE:
 969                 if (!ap_instructions_available()) {
 970                         mutex_unlock(&kvm->lock);
 971                         return -EOPNOTSUPP;
 972                 }
 973                 kvm->arch.crypto.apie = 0;
 974                 break;
 975         default:
 976                 mutex_unlock(&kvm->lock);
 977                 return -ENXIO;
 978         }
 979
 980         kvm_s390_vcpu_crypto_reset_all(kvm);
 981         mutex_unlock(&kvm->lock);
 982         return 0;
 983 }
 984
 985 static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req)
 986 {
 987         int cx;
 988         struct kvm_vcpu *vcpu;
 989
 990         kvm_for_each_vcpu(cx, vcpu, kvm)
 991                 kvm_s390_sync_request(req, vcpu);
 992 }
 993
 994 /*
 995  * Must be called with kvm->srcu held to avoid races on memslots, and with
 996  * kvm->slots_lock to avoid races with ourselves and kvm_s390_vm_stop_migration.
 997  */
 998 static int kvm_s390_vm_start_migration(struct kvm *kvm)
 999 {
1000         struct kvm_memory_slot *ms;
1001         struct kvm_memslots *slots;
1002         unsigned long ram_pages = 0;
1003         int slotnr;
1004
1005         /* migration mode already enabled */
1006         if (kvm->arch.migration_mode)
1007                 return 0;
1008         slots = kvm_memslots(kvm);
1009         if (!slots || !slots->used_slots)
1010                 return -EINVAL;
1011
1012         if (!kvm->arch.use_cmma) {
1013                 kvm->arch.migration_mode = 1;
1014                 return 0;
1015         }
1016         /* mark all the pages in active slots as dirty */
1017         for (slotnr = 0; slotnr < slots->used_slots; slotnr++) {
1018                 ms = slots->memslots + slotnr;
1019                 if (!ms->dirty_bitmap)
1020                         return -EINVAL;
1021                 /*
1022                  * The second half of the bitmap is only used on x86,
1023                  * and would be wasted otherwise, so we put it to good
1024                  * use here to keep track of the state of the storage
1025                  * attributes.
1026                  */
1027                 memset(kvm_second_dirty_bitmap(ms), 0xff, kvm_dirty_bitmap_bytes(ms));
1028                 ram_pages += ms->npages;
1029         }
1030         atomic64_set(&kvm->arch.cmma_dirty_pages, ram_pages);
1031         kvm->arch.migration_mode = 1;
1032         kvm_s390_sync_request_broadcast(kvm, KVM_REQ_START_MIGRATION);
1033         return 0;
1034 }
1035
1036 /*
1037  * Must be called with kvm->slots_lock to avoid races with ourselves and
1038  * kvm_s390_vm_start_migration.
1039  */
1040 static int kvm_s390_vm_stop_migration(struct kvm *kvm)
1041 {
1042         /* migration mode already disabled */
1043         if (!kvm->arch.migration_mode)
1044                 return 0;
1045         kvm->arch.migration_mode = 0;
1046         if (kvm->arch.use_cmma)
1047                 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_STOP_MIGRATION);
1048         return 0;
1049 }
1050
1051 static int kvm_s390_vm_set_migration(struct kvm *kvm,
1052                                      struct kvm_device_attr *attr)
1053 {
1054         int res = -ENXIO;
1055
1056         mutex_lock(&kvm->slots_lock);
1057         switch (attr->attr) {
1058         case KVM_S390_VM_MIGRATION_START:
1059                 res = kvm_s390_vm_start_migration(kvm);
1060                 break;
1061         case KVM_S390_VM_MIGRATION_STOP:
1062                 res = kvm_s390_vm_stop_migration(kvm);
1063                 break;
1064         default:
1065                 break;
1066         }
1067         mutex_unlock(&kvm->slots_lock);
1068
1069         return res;
1070 }
1071
1072 static int kvm_s390_vm_get_migration(struct kvm *kvm,
1073                                      struct kvm_device_attr *attr)
1074 {
1075         u64 mig = kvm->arch.migration_mode;
1076
1077         if (attr->attr != KVM_S390_VM_MIGRATION_STATUS)
1078                 return -ENXIO;
1079
1080         if (copy_to_user((void __user *)attr->addr, &mig, sizeof(mig)))
1081                 return -EFAULT;
1082         return 0;
1083 }
1084
1085 static int kvm_s390_set_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
1086 {
1087         struct kvm_s390_vm_tod_clock gtod;
1088
1089         if (copy_from_user(&gtod, (void __user *)attr->addr, sizeof(gtod)))
1090                 return -EFAULT;
1091
1092         if (!test_kvm_facility(kvm, 139) && gtod.epoch_idx)
1093                 return -EINVAL;
1094         kvm_s390_set_tod_clock(kvm, &gtod);
1095
1096         VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x, TOD base: 0x%llx",
1097                 gtod.epoch_idx, gtod.tod);
1098
1099         return 0;
1100 }
1101
1102 static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
1103 {
1104         u8 gtod_high;
1105
1106         if (copy_from_user(&gtod_high, (void __user *)attr->addr,
1107                                            sizeof(gtod_high)))
1108                 return -EFAULT;
1109
1110         if (gtod_high != 0)
1111                 return -EINVAL;
1112         VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high);
1113
1114         return 0;
1115 }
1116
1117 static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
1118 {
1119         struct kvm_s390_vm_tod_clock gtod = { 0 };
1120
1121         if (copy_from_user(&gtod.tod, (void __user *)attr->addr,
1122                            sizeof(gtod.tod)))
1123                 return -EFAULT;
1124
1125         kvm_s390_set_tod_clock(kvm, &gtod);
1126         VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod.tod);
1127         return 0;
1128 }
1129
1130 static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr)
1131 {
1132         int ret;
1133
1134         if (attr->flags)
1135                 return -EINVAL;
1136
1137         switch (attr->attr) {
1138         case KVM_S390_VM_TOD_EXT:
1139                 ret = kvm_s390_set_tod_ext(kvm, attr);
1140                 break;
1141         case KVM_S390_VM_TOD_HIGH:
1142                 ret = kvm_s390_set_tod_high(kvm, attr);
1143                 break;
1144         case KVM_S390_VM_TOD_LOW:
1145                 ret = kvm_s390_set_tod_low(kvm, attr);
1146                 break;
1147         default:
1148                 ret = -ENXIO;
1149                 break;
1150         }
1151         return ret;
1152 }
1153
1154 static void kvm_s390_get_tod_clock(struct kvm *kvm,
1155                                    struct kvm_s390_vm_tod_clock *gtod)
1156 {
1157         struct kvm_s390_tod_clock_ext htod;
1158
1159         preempt_disable();
1160
1161         get_tod_clock_ext((char *)&htod);
1162
1163         gtod->tod = htod.tod + kvm->arch.epoch;
1164         gtod->epoch_idx = 0;
1165         if (test_kvm_facility(kvm, 139)) {
1166                 gtod->epoch_idx = htod.epoch_idx + kvm->arch.epdx;
1167                 if (gtod->tod < htod.tod)
1168                         gtod->epoch_idx += 1;
1169         }
1170
1171         preempt_enable();
1172 }
1173
1174 static int kvm_s390_get_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
1175 {
1176         struct kvm_s390_vm_tod_clock gtod;
1177
1178         memset(&gtod, 0, sizeof(gtod));
1179         kvm_s390_get_tod_clock(kvm, &gtod);
1180         if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
1181                 return -EFAULT;
1182
1183         VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x, TOD base: 0x%llx",
1184                 gtod.epoch_idx, gtod.tod);
1185         return 0;
1186 }
1187
1188 static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
1189 {
1190         u8 gtod_high = 0;
1191
1192         if (copy_to_user((void __user *)attr->addr, &gtod_high,
1193                                          sizeof(gtod_high)))
1194                 return -EFAULT;
1195         VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high);
1196
1197         return 0;
1198 }
1199
1200 static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
1201 {
1202         u64 gtod;
1203
1204         gtod = kvm_s390_get_tod_clock_fast(kvm);
1205         if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
1206                 return -EFAULT;
1207         VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod);
1208
1209         return 0;
1210 }
1211
1212 static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr)
1213 {
1214         int ret;
1215
1216         if (attr->flags)
1217                 return -EINVAL;
1218
1219         switch (attr->attr) {
1220         case KVM_S390_VM_TOD_EXT:
1221                 ret = kvm_s390_get_tod_ext(kvm, attr);
1222                 break;
1223         case KVM_S390_VM_TOD_HIGH:
1224                 ret = kvm_s390_get_tod_high(kvm, attr);
1225                 break;
1226         case KVM_S390_VM_TOD_LOW:
1227                 ret = kvm_s390_get_tod_low(kvm, attr);
1228                 break;
1229         default:
1230                 ret = -ENXIO;
1231                 break;
1232         }
1233         return ret;
1234 }
1235
1236 static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr)
1237 {
1238         struct kvm_s390_vm_cpu_processor *proc;
1239         u16 lowest_ibc, unblocked_ibc;
1240         int ret = 0;
1241
1242         mutex_lock(&kvm->lock);
1243         if (kvm->created_vcpus) {
1244                 ret = -EBUSY;
1245                 goto out;
1246         }
1247         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
1248         if (!proc) {
1249                 ret = -ENOMEM;
1250                 goto out;
1251         }
1252         if (!copy_from_user(proc, (void __user *)attr->addr,
1253                             sizeof(*proc))) {
1254                 kvm->arch.model.cpuid = proc->cpuid;
1255                 lowest_ibc = sclp.ibc >> 16 & 0xfff;
1256                 unblocked_ibc = sclp.ibc & 0xfff;
1257                 if (lowest_ibc && proc->ibc) {
1258                         if (proc->ibc > unblocked_ibc)
1259                                 kvm->arch.model.ibc = unblocked_ibc;
1260                         else if (proc->ibc < lowest_ibc)
1261                                 kvm->arch.model.ibc = lowest_ibc;
1262                         else
1263                                 kvm->arch.model.ibc = proc->ibc;
1264                 }
1265                 memcpy(kvm->arch.model.fac_list, proc->fac_list,
1266                        S390_ARCH_FAC_LIST_SIZE_BYTE);
1267                 VM_EVENT(kvm, 3, "SET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
1268                          kvm->arch.model.ibc,
1269                          kvm->arch.model.cpuid);
1270                 VM_EVENT(kvm, 3, "SET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
1271                          kvm->arch.model.fac_list[0],
1272                          kvm->arch.model.fac_list[1],
1273                          kvm->arch.model.fac_list[2]);
1274         } else
1275                 ret = -EFAULT;
1276         kfree(proc);
1277 out:
1278         mutex_unlock(&kvm->lock);
1279         return ret;
1280 }
1281
1282 static int kvm_s390_set_processor_feat(struct kvm *kvm,
1283                                        struct kvm_device_attr *attr)
1284 {
1285         struct kvm_s390_vm_cpu_feat data;
1286
1287         if (copy_from_user(&data, (void __user *)attr->addr, sizeof(data)))
1288                 return -EFAULT;
1289         if (!bitmap_subset((unsigned long *) data.feat,
1290                            kvm_s390_available_cpu_feat,
1291                            KVM_S390_VM_CPU_FEAT_NR_BITS))
1292                 return -EINVAL;
1293
1294         mutex_lock(&kvm->lock);
1295         if (kvm->created_vcpus) {
1296                 mutex_unlock(&kvm->lock);
1297                 return -EBUSY;
1298         }
1299         bitmap_copy(kvm->arch.cpu_feat, (unsigned long *) data.feat,
1300                     KVM_S390_VM_CPU_FEAT_NR_BITS);
1301         mutex_unlock(&kvm->lock);
1302         VM_EVENT(kvm, 3, "SET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx",
1303                          data.feat[0],
1304                          data.feat[1],
1305                          data.feat[2]);
1306         return 0;
1307 }
1308
1309 static int kvm_s390_set_processor_subfunc(struct kvm *kvm,
1310                                           struct kvm_device_attr *attr)
1311 {
1312         mutex_lock(&kvm->lock);
1313         if (kvm->created_vcpus) {
1314                 mutex_unlock(&kvm->lock);
1315                 return -EBUSY;
1316         }
1317
1318         if (copy_from_user(&kvm->arch.model.subfuncs, (void __user *)attr->addr,
1319                            sizeof(struct kvm_s390_vm_cpu_subfunc))) {
1320                 mutex_unlock(&kvm->lock);
1321                 return -EFAULT;
1322         }
1323         mutex_unlock(&kvm->lock);
1324
1325         VM_EVENT(kvm, 3, "SET: guest PLO    subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1326                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0],
1327                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1],
1328                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2],
1329                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]);
1330         VM_EVENT(kvm, 3, "SET: guest PTFF   subfunc 0x%16.16lx.%16.16lx",
1331                  ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0],
1332                  ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]);
1333         VM_EVENT(kvm, 3, "SET: guest KMAC   subfunc 0x%16.16lx.%16.16lx",
1334                  ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0],
1335                  ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]);
1336         VM_EVENT(kvm, 3, "SET: guest KMC    subfunc 0x%16.16lx.%16.16lx",
1337                  ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0],
1338                  ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]);
1339         VM_EVENT(kvm, 3, "SET: guest KM     subfunc 0x%16.16lx.%16.16lx",
1340                  ((unsigned long *) &kvm->arch.model.subfuncs.km)[0],
1341                  ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]);
1342         VM_EVENT(kvm, 3, "SET: guest KIMD   subfunc 0x%16.16lx.%16.16lx",
1343                  ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0],
1344                  ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]);
1345         VM_EVENT(kvm, 3, "SET: guest KLMD   subfunc 0x%16.16lx.%16.16lx",
1346                  ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0],
1347                  ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]);
1348         VM_EVENT(kvm, 3, "SET: guest PCKMO  subfunc 0x%16.16lx.%16.16lx",
1349                  ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0],
1350                  ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]);
1351         VM_EVENT(kvm, 3, "SET: guest KMCTR  subfunc 0x%16.16lx.%16.16lx",
1352                  ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0],
1353                  ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]);
1354         VM_EVENT(kvm, 3, "SET: guest KMF    subfunc 0x%16.16lx.%16.16lx",
1355                  ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0],
1356                  ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]);
1357         VM_EVENT(kvm, 3, "SET: guest KMO    subfunc 0x%16.16lx.%16.16lx",
1358                  ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0],
1359                  ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]);
1360         VM_EVENT(kvm, 3, "SET: guest PCC    subfunc 0x%16.16lx.%16.16lx",
1361                  ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0],
1362                  ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]);
1363         VM_EVENT(kvm, 3, "SET: guest PPNO   subfunc 0x%16.16lx.%16.16lx",
1364                  ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0],
1365                  ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]);
1366         VM_EVENT(kvm, 3, "SET: guest KMA    subfunc 0x%16.16lx.%16.16lx",
1367                  ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0],
1368                  ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]);
1369         VM_EVENT(kvm, 3, "SET: guest KDSA   subfunc 0x%16.16lx.%16.16lx",
1370                  ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0],
1371                  ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]);
1372         VM_EVENT(kvm, 3, "SET: guest SORTL  subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1373                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0],
1374                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1],
1375                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2],
1376                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]);
1377         VM_EVENT(kvm, 3, "SET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1378                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0],
1379                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1],
1380                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2],
1381                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]);
1382
1383         return 0;
1384 }
1385
1386 static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
1387 {
1388         int ret = -ENXIO;
1389
1390         switch (attr->attr) {
1391         case KVM_S390_VM_CPU_PROCESSOR:
1392                 ret = kvm_s390_set_processor(kvm, attr);
1393                 break;
1394         case KVM_S390_VM_CPU_PROCESSOR_FEAT:
1395                 ret = kvm_s390_set_processor_feat(kvm, attr);
1396                 break;
1397         case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1398                 ret = kvm_s390_set_processor_subfunc(kvm, attr);
1399                 break;
1400         }
1401         return ret;
1402 }
1403
1404 static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr)
1405 {
1406         struct kvm_s390_vm_cpu_processor *proc;
1407         int ret = 0;
1408
1409         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
1410         if (!proc) {
1411                 ret = -ENOMEM;
1412                 goto out;
1413         }
1414         proc->cpuid = kvm->arch.model.cpuid;
1415         proc->ibc = kvm->arch.model.ibc;
1416         memcpy(&proc->fac_list, kvm->arch.model.fac_list,
1417                S390_ARCH_FAC_LIST_SIZE_BYTE);
1418         VM_EVENT(kvm, 3, "GET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
1419                  kvm->arch.model.ibc,
1420                  kvm->arch.model.cpuid);
1421         VM_EVENT(kvm, 3, "GET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
1422                  kvm->arch.model.fac_list[0],
1423                  kvm->arch.model.fac_list[1],
1424                  kvm->arch.model.fac_list[2]);
1425         if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc)))
1426                 ret = -EFAULT;
1427         kfree(proc);
1428 out:
1429         return ret;
1430 }
1431
1432 static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr)
1433 {
1434         struct kvm_s390_vm_cpu_machine *mach;
1435         int ret = 0;
1436
1437         mach = kzalloc(sizeof(*mach), GFP_KERNEL);
1438         if (!mach) {
1439                 ret = -ENOMEM;
1440                 goto out;
1441         }
1442         get_cpu_id((struct cpuid *) &mach->cpuid);
1443         mach->ibc = sclp.ibc;
1444         memcpy(&mach->fac_mask, kvm->arch.model.fac_mask,
1445                S390_ARCH_FAC_LIST_SIZE_BYTE);
1446         memcpy((unsigned long *)&mach->fac_list, S390_lowcore.stfle_fac_list,
1447                sizeof(S390_lowcore.stfle_fac_list));
1448         VM_EVENT(kvm, 3, "GET: host ibc:  0x%4.4x, host cpuid:  0x%16.16llx",
1449                  kvm->arch.model.ibc,
1450                  kvm->arch.model.cpuid);
1451         VM_EVENT(kvm, 3, "GET: host facmask:  0x%16.16llx.%16.16llx.%16.16llx",
1452                  mach->fac_mask[0],
1453                  mach->fac_mask[1],
1454                  mach->fac_mask[2]);
1455         VM_EVENT(kvm, 3, "GET: host faclist:  0x%16.16llx.%16.16llx.%16.16llx",
1456                  mach->fac_list[0],
1457                  mach->fac_list[1],
1458                  mach->fac_list[2]);
1459         if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach)))
1460                 ret = -EFAULT;
1461         kfree(mach);
1462 out:
1463         return ret;
1464 }
1465
1466 static int kvm_s390_get_processor_feat(struct kvm *kvm,
1467                                        struct kvm_device_attr *attr)
1468 {
1469         struct kvm_s390_vm_cpu_feat data;
1470
1471         bitmap_copy((unsigned long *) data.feat, kvm->arch.cpu_feat,
1472                     KVM_S390_VM_CPU_FEAT_NR_BITS);
1473         if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
1474                 return -EFAULT;
1475         VM_EVENT(kvm, 3, "GET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx",
1476                          data.feat[0],
1477                          data.feat[1],
1478                          data.feat[2]);
1479         return 0;
1480 }
1481
1482 static int kvm_s390_get_machine_feat(struct kvm *kvm,
1483                                      struct kvm_device_attr *attr)
1484 {
1485         struct kvm_s390_vm_cpu_feat data;
1486
1487         bitmap_copy((unsigned long *) data.feat,
1488                     kvm_s390_available_cpu_feat,
1489                     KVM_S390_VM_CPU_FEAT_NR_BITS);
1490         if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
1491                 return -EFAULT;
1492         VM_EVENT(kvm, 3, "GET: host feat:  0x%16.16llx.0x%16.16llx.0x%16.16llx",
1493                          data.feat[0],
1494                          data.feat[1],
1495                          data.feat[2]);
1496         return 0;
1497 }
1498
1499 static int kvm_s390_get_processor_subfunc(struct kvm *kvm,
1500                                           struct kvm_device_attr *attr)
1501 {
1502         if (copy_to_user((void __user *)attr->addr, &kvm->arch.model.subfuncs,
1503             sizeof(struct kvm_s390_vm_cpu_subfunc)))
1504                 return -EFAULT;
1505
1506         VM_EVENT(kvm, 3, "GET: guest PLO    subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1507                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0],
1508                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1],
1509                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2],
1510                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]);
1511         VM_EVENT(kvm, 3, "GET: guest PTFF   subfunc 0x%16.16lx.%16.16lx",
1512                  ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0],
1513                  ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]);
1514         VM_EVENT(kvm, 3, "GET: guest KMAC   subfunc 0x%16.16lx.%16.16lx",
1515                  ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0],
1516                  ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]);
1517         VM_EVENT(kvm, 3, "GET: guest KMC    subfunc 0x%16.16lx.%16.16lx",
1518                  ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0],
1519                  ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]);
1520         VM_EVENT(kvm, 3, "GET: guest KM     subfunc 0x%16.16lx.%16.16lx",
1521                  ((unsigned long *) &kvm->arch.model.subfuncs.km)[0],
1522                  ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]);
1523         VM_EVENT(kvm, 3, "GET: guest KIMD   subfunc 0x%16.16lx.%16.16lx",
1524                  ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0],
1525                  ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]);
1526         VM_EVENT(kvm, 3, "GET: guest KLMD   subfunc 0x%16.16lx.%16.16lx",
1527                  ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0],
1528                  ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]);
1529         VM_EVENT(kvm, 3, "GET: guest PCKMO  subfunc 0x%16.16lx.%16.16lx",
1530                  ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0],
1531                  ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]);
1532         VM_EVENT(kvm, 3, "GET: guest KMCTR  subfunc 0x%16.16lx.%16.16lx",
1533                  ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0],
1534                  ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]);
1535         VM_EVENT(kvm, 3, "GET: guest KMF    subfunc 0x%16.16lx.%16.16lx",
1536                  ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0],
1537                  ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]);
1538         VM_EVENT(kvm, 3, "GET: guest KMO    subfunc 0x%16.16lx.%16.16lx",
1539                  ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0],
1540                  ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]);
1541         VM_EVENT(kvm, 3, "GET: guest PCC    subfunc 0x%16.16lx.%16.16lx",
1542                  ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0],
1543                  ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]);
1544         VM_EVENT(kvm, 3, "GET: guest PPNO   subfunc 0x%16.16lx.%16.16lx",
1545                  ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0],
1546                  ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]);
1547         VM_EVENT(kvm, 3, "GET: guest KMA    subfunc 0x%16.16lx.%16.16lx",
1548                  ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0],
1549                  ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]);
1550         VM_EVENT(kvm, 3, "GET: guest KDSA   subfunc 0x%16.16lx.%16.16lx",
1551                  ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0],
1552                  ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]);
1553         VM_EVENT(kvm, 3, "GET: guest SORTL  subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1554                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0],
1555                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1],
1556                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2],
1557                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]);
1558         VM_EVENT(kvm, 3, "GET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1559                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0],
1560                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1],
1561                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2],
1562                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]);
1563
1564         return 0;
1565 }
1566
1567 static int kvm_s390_get_machine_subfunc(struct kvm *kvm,
1568                                         struct kvm_device_attr *attr)
1569 {
1570         if (copy_to_user((void __user *)attr->addr, &kvm_s390_available_subfunc,
1571             sizeof(struct kvm_s390_vm_cpu_subfunc)))
1572                 return -EFAULT;
1573
1574         VM_EVENT(kvm, 3, "GET: host  PLO    subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1575                  ((unsigned long *) &kvm_s390_available_subfunc.plo)[0],
1576                  ((unsigned long *) &kvm_s390_available_subfunc.plo)[1],
1577                  ((unsigned long *) &kvm_s390_available_subfunc.plo)[2],
1578                  ((unsigned long *) &kvm_s390_available_subfunc.plo)[3]);
1579         VM_EVENT(kvm, 3, "GET: host  PTFF   subfunc 0x%16.16lx.%16.16lx",
1580                  ((unsigned long *) &kvm_s390_available_subfunc.ptff)[0],
1581                  ((unsigned long *) &kvm_s390_available_subfunc.ptff)[1]);
1582         VM_EVENT(kvm, 3, "GET: host  KMAC   subfunc 0x%16.16lx.%16.16lx",
1583                  ((unsigned long *) &kvm_s390_available_subfunc.kmac)[0],
1584                  ((unsigned long *) &kvm_s390_available_subfunc.kmac)[1]);
1585         VM_EVENT(kvm, 3, "GET: host  KMC    subfunc 0x%16.16lx.%16.16lx",
1586                  ((unsigned long *) &kvm_s390_available_subfunc.kmc)[0],
1587                  ((unsigned long *) &kvm_s390_available_subfunc.kmc)[1]);
1588         VM_EVENT(kvm, 3, "GET: host  KM     subfunc 0x%16.16lx.%16.16lx",
1589                  ((unsigned long *) &kvm_s390_available_subfunc.km)[0],
1590                  ((unsigned long *) &kvm_s390_available_subfunc.km)[1]);
1591         VM_EVENT(kvm, 3, "GET: host  KIMD   subfunc 0x%16.16lx.%16.16lx",
1592                  ((unsigned long *) &kvm_s390_available_subfunc.kimd)[0],
1593                  ((unsigned long *) &kvm_s390_available_subfunc.kimd)[1]);
1594         VM_EVENT(kvm, 3, "GET: host  KLMD   subfunc 0x%16.16lx.%16.16lx",
1595                  ((unsigned long *) &kvm_s390_available_subfunc.klmd)[0],
1596                  ((unsigned long *) &kvm_s390_available_subfunc.klmd)[1]);
1597         VM_EVENT(kvm, 3, "GET: host  PCKMO  subfunc 0x%16.16lx.%16.16lx",
1598                  ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[0],
1599                  ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[1]);
1600         VM_EVENT(kvm, 3, "GET: host  KMCTR  subfunc 0x%16.16lx.%16.16lx",
1601                  ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[0],
1602                  ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[1]);
1603         VM_EVENT(kvm, 3, "GET: host  KMF    subfunc 0x%16.16lx.%16.16lx",
1604                  ((unsigned long *) &kvm_s390_available_subfunc.kmf)[0],
1605                  ((unsigned long *) &kvm_s390_available_subfunc.kmf)[1]);
1606         VM_EVENT(kvm, 3, "GET: host  KMO    subfunc 0x%16.16lx.%16.16lx",
1607                  ((unsigned long *) &kvm_s390_available_subfunc.kmo)[0],
1608                  ((unsigned long *) &kvm_s390_available_subfunc.kmo)[1]);
1609         VM_EVENT(kvm, 3, "GET: host  PCC    subfunc 0x%16.16lx.%16.16lx",
1610                  ((unsigned long *) &kvm_s390_available_subfunc.pcc)[0],
1611                  ((unsigned long *) &kvm_s390_available_subfunc.pcc)[1]);
1612         VM_EVENT(kvm, 3, "GET: host  PPNO   subfunc 0x%16.16lx.%16.16lx",
1613                  ((unsigned long *) &kvm_s390_available_subfunc.ppno)[0],
1614                  ((unsigned long *) &kvm_s390_available_subfunc.ppno)[1]);
1615         VM_EVENT(kvm, 3, "GET: host  KMA    subfunc 0x%16.16lx.%16.16lx",
1616                  ((unsigned long *) &kvm_s390_available_subfunc.kma)[0],
1617                  ((unsigned long *) &kvm_s390_available_subfunc.kma)[1]);
1618         VM_EVENT(kvm, 3, "GET: host  KDSA   subfunc 0x%16.16lx.%16.16lx",
1619                  ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[0],
1620                  ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[1]);
1621         VM_EVENT(kvm, 3, "GET: host  SORTL  subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1622                  ((unsigned long *) &kvm_s390_available_subfunc.sortl)[0],
1623                  ((unsigned long *) &kvm_s390_available_subfunc.sortl)[1],
1624                  ((unsigned long *) &kvm_s390_available_subfunc.sortl)[2],
1625                  ((unsigned long *) &kvm_s390_available_subfunc.sortl)[3]);
1626         VM_EVENT(kvm, 3, "GET: host  DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1627                  ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[0],
1628                  ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[1],
1629                  ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[2],
1630                  ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[3]);
1631
1632         return 0;
1633 }
1634
1635 static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
1636 {
1637         int ret = -ENXIO;
1638
1639         switch (attr->attr) {
1640         case KVM_S390_VM_CPU_PROCESSOR:
1641                 ret = kvm_s390_get_processor(kvm, attr);
1642                 break;
1643         case KVM_S390_VM_CPU_MACHINE:
1644                 ret = kvm_s390_get_machine(kvm, attr);
1645                 break;
1646         case KVM_S390_VM_CPU_PROCESSOR_FEAT:
1647                 ret = kvm_s390_get_processor_feat(kvm, attr);
1648                 break;
1649         case KVM_S390_VM_CPU_MACHINE_FEAT:
1650                 ret = kvm_s390_get_machine_feat(kvm, attr);
1651                 break;
1652         case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1653                 ret = kvm_s390_get_processor_subfunc(kvm, attr);
1654                 break;
1655         case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
1656                 ret = kvm_s390_get_machine_subfunc(kvm, attr);
1657                 break;
1658         }
1659         return ret;
1660 }
1661
1662 static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1663 {
1664         int ret;
1665
1666         switch (attr->group) {
1667         case KVM_S390_VM_MEM_CTRL:
1668                 ret = kvm_s390_set_mem_control(kvm, attr);
1669                 break;
1670         case KVM_S390_VM_TOD:
1671                 ret = kvm_s390_set_tod(kvm, attr);
1672                 break;
1673         case KVM_S390_VM_CPU_MODEL:
1674                 ret = kvm_s390_set_cpu_model(kvm, attr);
1675                 break;
1676         case KVM_S390_VM_CRYPTO:
1677                 ret = kvm_s390_vm_set_crypto(kvm, attr);
1678                 break;
1679         case KVM_S390_VM_MIGRATION:
1680                 ret = kvm_s390_vm_set_migration(kvm, attr);
1681                 break;
1682         default:
1683                 ret = -ENXIO;
1684                 break;
1685         }
1686
1687         return ret;
1688 }
1689
1690 static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1691 {
1692         int ret;
1693
1694         switch (attr->group) {
1695         case KVM_S390_VM_MEM_CTRL:
1696                 ret = kvm_s390_get_mem_control(kvm, attr);
1697                 break;
1698         case KVM_S390_VM_TOD:
1699                 ret = kvm_s390_get_tod(kvm, attr);
1700                 break;
1701         case KVM_S390_VM_CPU_MODEL:
1702                 ret = kvm_s390_get_cpu_model(kvm, attr);
1703                 break;
1704         case KVM_S390_VM_MIGRATION:
1705                 ret = kvm_s390_vm_get_migration(kvm, attr);
1706                 break;
1707         default:
1708                 ret = -ENXIO;
1709                 break;
1710         }
1711
1712         return ret;
1713 }
1714
1715 static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1716 {
1717         int ret;
1718
1719         switch (attr->group) {
1720         case KVM_S390_VM_MEM_CTRL:
1721                 switch (attr->attr) {
1722                 case KVM_S390_VM_MEM_ENABLE_CMMA:
1723                 case KVM_S390_VM_MEM_CLR_CMMA:
1724                         ret = sclp.has_cmma ? 0 : -ENXIO;
1725                         break;
1726                 case KVM_S390_VM_MEM_LIMIT_SIZE:
1727                         ret = 0;
1728                         break;
1729                 default:
1730                         ret = -ENXIO;
1731                         break;
1732                 }
1733                 break;
1734         case KVM_S390_VM_TOD:
1735                 switch (attr->attr) {
1736                 case KVM_S390_VM_TOD_LOW:
1737                 case KVM_S390_VM_TOD_HIGH:
1738                         ret = 0;
1739                         break;
1740                 default:
1741                         ret = -ENXIO;
1742                         break;
1743                 }
1744                 break;
1745         case KVM_S390_VM_CPU_MODEL:
1746                 switch (attr->attr) {
1747                 case KVM_S390_VM_CPU_PROCESSOR:
1748                 case KVM_S390_VM_CPU_MACHINE:
1749                 case KVM_S390_VM_CPU_PROCESSOR_FEAT:
1750                 case KVM_S390_VM_CPU_MACHINE_FEAT:
1751                 case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
1752                 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1753                         ret = 0;
1754                         break;
1755                 default:
1756                         ret = -ENXIO;
1757                         break;
1758                 }
1759                 break;
1760         case KVM_S390_VM_CRYPTO:
1761                 switch (attr->attr) {
1762                 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
1763                 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
1764                 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
1765                 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
1766                         ret = 0;
1767                         break;
1768                 case KVM_S390_VM_CRYPTO_ENABLE_APIE:
1769                 case KVM_S390_VM_CRYPTO_DISABLE_APIE:
1770                         ret = ap_instructions_available() ? 0 : -ENXIO;
1771                         break;
1772                 default:
1773                         ret = -ENXIO;
1774                         break;
1775                 }
1776                 break;
1777         case KVM_S390_VM_MIGRATION:
1778                 ret = 0;
1779                 break;
1780         default:
1781                 ret = -ENXIO;
1782                 break;
1783         }
1784
1785         return ret;
1786 }
1787
1788 static long kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
1789 {
1790         uint8_t *keys;
1791         uint64_t hva;
1792         int srcu_idx, i, r = 0;
1793
1794         if (args->flags != 0)
1795                 return -EINVAL;
1796
1797         /* Is this guest using storage keys? */
1798         if (!mm_uses_skeys(current->mm))
1799                 return KVM_S390_GET_SKEYS_NONE;
1800
1801         /* Enforce sane limit on memory allocation */
1802         if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
1803                 return -EINVAL;
1804
1805         keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL);
1806         if (!keys)
1807                 return -ENOMEM;
1808
1809         down_read(&current->mm->mmap_sem);
1810         srcu_idx = srcu_read_lock(&kvm->srcu);
1811         for (i = 0; i < args->count; i++) {
1812                 hva = gfn_to_hva(kvm, args->start_gfn + i);
1813                 if (kvm_is_error_hva(hva)) {
1814                         r = -EFAULT;
1815                         break;
1816                 }
1817
1818                 r = get_guest_storage_key(current->mm, hva, &keys[i]);
1819                 if (r)
1820                         break;
1821         }
1822         srcu_read_unlock(&kvm->srcu, srcu_idx);
1823         up_read(&current->mm->mmap_sem);
1824
1825         if (!r) {
1826                 r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys,
1827                                  sizeof(uint8_t) * args->count);
1828                 if (r)
1829                         r = -EFAULT;
1830         }
1831
1832         kvfree(keys);
1833         return r;
1834 }
1835
1836 static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
1837 {
1838         uint8_t *keys;
1839         uint64_t hva;
1840         int srcu_idx, i, r = 0;
1841         bool unlocked;
1842
1843         if (args->flags != 0)
1844                 return -EINVAL;
1845
1846         /* Enforce sane limit on memory allocation */
1847         if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
1848                 return -EINVAL;
1849
1850         keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL);
1851         if (!keys)
1852                 return -ENOMEM;
1853
1854         r = copy_from_user(keys, (uint8_t __user *)args->skeydata_addr,
1855                            sizeof(uint8_t) * args->count);
1856         if (r) {
1857                 r = -EFAULT;
1858                 goto out;
1859         }
1860
1861         /* Enable storage key handling for the guest */
1862         r = s390_enable_skey();
1863         if (r)
1864                 goto out;
1865
1866         i = 0;
1867         down_read(&current->mm->mmap_sem);
1868         srcu_idx = srcu_read_lock(&kvm->srcu);
1869         while (i < args->count) {
1870                 unlocked = false;
1871                 hva = gfn_to_hva(kvm, args->start_gfn + i);
1872                 if (kvm_is_error_hva(hva)) {
1873                         r = -EFAULT;
1874                         break;
1875                 }
1876
1877                 /* Lowest order bit is reserved */
1878                 if (keys[i] & 0x01) {
1879                         r = -EINVAL;
1880                         break;
1881                 }
1882
1883                 r = set_guest_storage_key(current->mm, hva, keys[i], 0);
1884                 if (r) {
1885                         r = fixup_user_fault(current, current->mm, hva,
1886                                              FAULT_FLAG_WRITE, &unlocked);
1887                         if (r)
1888                                 break;
1889                 }
1890                 if (!r)
1891                         i++;
1892         }
1893         srcu_read_unlock(&kvm->srcu, srcu_idx);
1894         up_read(&current->mm->mmap_sem);
1895 out:
1896         kvfree(keys);
1897         return r;
1898 }
1899
1900 /*
1901  * Base address and length must be sent at the start of each block, therefore
1902  * it's cheaper to send some clean data, as long as it's less than the size of
1903  * two longs.
1904  */
1905 #define KVM_S390_MAX_BIT_DISTANCE (2 * sizeof(void *))
1906 /* for consistency */
1907 #define KVM_S390_CMMA_SIZE_MAX ((u32)KVM_S390_SKEYS_MAX)
1908
1909 /*
1910  * Similar to gfn_to_memslot, but returns the index of a memslot also when the
1911  * address falls in a hole. In that case the index of one of the memslots
1912  * bordering the hole is returned.
1913  */
1914 static int gfn_to_memslot_approx(struct kvm_memslots *slots, gfn_t gfn)
1915 {
1916         int start = 0, end = slots->used_slots;
1917         int slot = atomic_read(&slots->lru_slot);
1918         struct kvm_memory_slot *memslots = slots->memslots;
1919
1920         if (gfn >= memslots[slot].base_gfn &&
1921             gfn < memslots[slot].base_gfn + memslots[slot].npages)
1922                 return slot;
1923
1924         while (start < end) {
1925                 slot = start + (end - start) / 2;
1926
1927                 if (gfn >= memslots[slot].base_gfn)
1928                         end = slot;
1929                 else
1930                         start = slot + 1;
1931         }
1932
1933         if (gfn >= memslots[start].base_gfn &&
1934             gfn < memslots[start].base_gfn + memslots[start].npages) {
1935                 atomic_set(&slots->lru_slot, start);
1936         }
1937
1938         return start;
1939 }
1940
1941 static int kvm_s390_peek_cmma(struct kvm *kvm, struct kvm_s390_cmma_log *args,
1942                               u8 *res, unsigned long bufsize)
1943 {
1944         unsigned long pgstev, hva, cur_gfn = args->start_gfn;
1945
1946         args->count = 0;
1947         while (args->count < bufsize) {
1948                 hva = gfn_to_hva(kvm, cur_gfn);
1949                 /*
1950                  * We return an error if the first value was invalid, but we
1951                  * return successfully if at least one value was copied.
1952                  */
1953                 if (kvm_is_error_hva(hva))
1954                         return args->count ? 0 : -EFAULT;
1955                 if (get_pgste(kvm->mm, hva, &pgstev) < 0)
1956                         pgstev = 0;
1957                 res[args->count++] = (pgstev >> 24) & 0x43;
1958                 cur_gfn++;
1959         }
1960
1961         return 0;
1962 }
1963
1964 static unsigned long kvm_s390_next_dirty_cmma(struct kvm_memslots *slots,
1965                                               unsigned long cur_gfn)
1966 {
1967         int slotidx = gfn_to_memslot_approx(slots, cur_gfn);
1968         struct kvm_memory_slot *ms = slots->memslots + slotidx;
1969         unsigned long ofs = cur_gfn - ms->base_gfn;
1970
1971         if (ms->base_gfn + ms->npages <= cur_gfn) {
1972                 slotidx--;
1973                 /* If we are above the highest slot, wrap around */
1974                 if (slotidx < 0)
1975                         slotidx = slots->used_slots - 1;
1976
1977                 ms = slots->memslots + slotidx;
1978                 ofs = 0;
1979         }
1980         ofs = find_next_bit(kvm_second_dirty_bitmap(ms), ms->npages, ofs);
1981         while ((slotidx > 0) && (ofs >= ms->npages)) {
1982                 slotidx--;
1983                 ms = slots->memslots + slotidx;
1984                 ofs = find_next_bit(kvm_second_dirty_bitmap(ms), ms->npages, 0);
1985         }
1986         return ms->base_gfn + ofs;
1987 }
1988
1989 static int kvm_s390_get_cmma(struct kvm *kvm, struct kvm_s390_cmma_log *args,
1990                              u8 *res, unsigned long bufsize)
1991 {
1992         unsigned long mem_end, cur_gfn, next_gfn, hva, pgstev;
1993         struct kvm_memslots *slots = kvm_memslots(kvm);
1994         struct kvm_memory_slot *ms;
1995
1996         cur_gfn = kvm_s390_next_dirty_cmma(slots, args->start_gfn);
1997         ms = gfn_to_memslot(kvm, cur_gfn);
1998         args->count = 0;
1999         args->start_gfn = cur_gfn;
2000         if (!ms)
2001                 return 0;
2002         next_gfn = kvm_s390_next_dirty_cmma(slots, cur_gfn + 1);
2003         mem_end = slots->memslots[0].base_gfn + slots->memslots[0].npages;
2004
2005         while (args->count < bufsize) {
2006                 hva = gfn_to_hva(kvm, cur_gfn);
2007                 if (kvm_is_error_hva(hva))
2008                         return 0;
2009                 /* Decrement only if we actually flipped the bit to 0 */
2010                 if (test_and_clear_bit(cur_gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
2011                         atomic64_dec(&kvm->arch.cmma_dirty_pages);
2012                 if (get_pgste(kvm->mm, hva, &pgstev) < 0)
2013                         pgstev = 0;
2014                 /* Save the value */
2015                 res[args->count++] = (pgstev >> 24) & 0x43;
2016                 /* If the next bit is too far away, stop. */
2017                 if (next_gfn > cur_gfn + KVM_S390_MAX_BIT_DISTANCE)
2018                         return 0;
2019                 /* If we reached the previous "next", find the next one */
2020                 if (cur_gfn == next_gfn)
2021                         next_gfn = kvm_s390_next_dirty_cmma(slots, cur_gfn + 1);
2022                 /* Reached the end of memory or of the buffer, stop */
2023                 if ((next_gfn >= mem_end) ||
2024                     (next_gfn - args->start_gfn >= bufsize))
2025                         return 0;
2026                 cur_gfn++;
2027                 /* Reached the end of the current memslot, take the next one. */
2028                 if (cur_gfn - ms->base_gfn >= ms->npages) {
2029                         ms = gfn_to_memslot(kvm, cur_gfn);
2030                         if (!ms)
2031                                 return 0;
2032                 }
2033         }
2034         return 0;
2035 }
2036
2037 /*
2038  * This function searches for the next page with dirty CMMA attributes, and
2039  * saves the attributes in the buffer up to either the end of the buffer or
2040  * until a block of at least KVM_S390_MAX_BIT_DISTANCE clean bits is found;
2041  * no trailing clean bytes are saved.
2042  * In case no dirty bits were found, or if CMMA was not enabled or used, the
2043  * output buffer will indicate 0 as length.
2044  */
2045 static int kvm_s390_get_cmma_bits(struct kvm *kvm,
2046                                   struct kvm_s390_cmma_log *args)
2047 {
2048         unsigned long bufsize;
2049         int srcu_idx, peek, ret;
2050         u8 *values;
2051
2052         if (!kvm->arch.use_cmma)
2053                 return -ENXIO;
2054         /* Invalid/unsupported flags were specified */
2055         if (args->flags & ~KVM_S390_CMMA_PEEK)
2056                 return -EINVAL;
2057         /* Migration mode query, and we are not doing a migration */
2058         peek = !!(args->flags & KVM_S390_CMMA_PEEK);
2059         if (!peek && !kvm->arch.migration_mode)
2060                 return -EINVAL;
2061         /* CMMA is disabled or was not used, or the buffer has length zero */
2062         bufsize = min(args->count, KVM_S390_CMMA_SIZE_MAX);
2063         if (!bufsize || !kvm->mm->context.uses_cmm) {
2064                 memset(args, 0, sizeof(*args));
2065                 return 0;
2066         }
2067         /* We are not peeking, and there are no dirty pages */
2068         if (!peek && !atomic64_read(&kvm->arch.cmma_dirty_pages)) {
2069                 memset(args, 0, sizeof(*args));
2070                 return 0;
2071         }
2072
2073         values = vmalloc(bufsize);
2074         if (!values)
2075                 return -ENOMEM;
2076
2077         down_read(&kvm->mm->mmap_sem);
2078         srcu_idx = srcu_read_lock(&kvm->srcu);
2079         if (peek)
2080                 ret = kvm_s390_peek_cmma(kvm, args, values, bufsize);
2081         else
2082                 ret = kvm_s390_get_cmma(kvm, args, values, bufsize);
2083         srcu_read_unlock(&kvm->srcu, srcu_idx);
2084         up_read(&kvm->mm->mmap_sem);
2085
2086         if (kvm->arch.migration_mode)
2087                 args->remaining = atomic64_read(&kvm->arch.cmma_dirty_pages);
2088         else
2089                 args->remaining = 0;
2090
2091         if (copy_to_user((void __user *)args->values, values, args->count))
2092                 ret = -EFAULT;
2093
2094         vfree(values);
2095         return ret;
2096 }
2097
2098 /*
2099  * This function sets the CMMA attributes for the given pages. If the input
2100  * buffer has zero length, no action is taken, otherwise the attributes are
2101  * set and the mm->context.uses_cmm flag is set.
2102  */
2103 static int kvm_s390_set_cmma_bits(struct kvm *kvm,
2104                                   const struct kvm_s390_cmma_log *args)
2105 {
2106         unsigned long hva, mask, pgstev, i;
2107         uint8_t *bits;
2108         int srcu_idx, r = 0;
2109
2110         mask = args->mask;
2111
2112         if (!kvm->arch.use_cmma)
2113                 return -ENXIO;
2114         /* invalid/unsupported flags */
2115         if (args->flags != 0)
2116                 return -EINVAL;
2117         /* Enforce sane limit on memory allocation */
2118         if (args->count > KVM_S390_CMMA_SIZE_MAX)
2119                 return -EINVAL;
2120         /* Nothing to do */
2121         if (args->count == 0)
2122                 return 0;
2123
2124         bits = vmalloc(array_size(sizeof(*bits), args->count));
2125         if (!bits)
2126                 return -ENOMEM;
2127
2128         r = copy_from_user(bits, (void __user *)args->values, args->count);
2129         if (r) {
2130                 r = -EFAULT;
2131                 goto out;
2132         }
2133
2134         down_read(&kvm->mm->mmap_sem);
2135         srcu_idx = srcu_read_lock(&kvm->srcu);
2136         for (i = 0; i < args->count; i++) {
2137                 hva = gfn_to_hva(kvm, args->start_gfn + i);
2138                 if (kvm_is_error_hva(hva)) {
2139                         r = -EFAULT;
2140                         break;
2141                 }
2142
2143                 pgstev = bits[i];
2144                 pgstev = pgstev << 24;
2145                 mask &= _PGSTE_GPS_USAGE_MASK | _PGSTE_GPS_NODAT;
2146                 set_pgste_bits(kvm->mm, hva, mask, pgstev);
2147         }
2148         srcu_read_unlock(&kvm->srcu, srcu_idx);
2149         up_read(&kvm->mm->mmap_sem);
2150
2151         if (!kvm->mm->context.uses_cmm) {
2152                 down_write(&kvm->mm->mmap_sem);
2153                 kvm->mm->context.uses_cmm = 1;
2154                 up_write(&kvm->mm->mmap_sem);
2155         }
2156 out:
2157         vfree(bits);
2158         return r;
2159 }
2160
2161 long kvm_arch_vm_ioctl(struct file *filp,
2162                        unsigned int ioctl, unsigned long arg)
2163 {
2164         struct kvm *kvm = filp->private_data;
2165         void __user *argp = (void __user *)arg;
2166         struct kvm_device_attr attr;
2167         int r;
2168
2169         switch (ioctl) {
2170         case KVM_S390_INTERRUPT: {
2171                 struct kvm_s390_interrupt s390int;
2172
2173                 r = -EFAULT;
2174                 if (copy_from_user(&s390int, argp, sizeof(s390int)))
2175                         break;
2176                 r = kvm_s390_inject_vm(kvm, &s390int);
2177                 break;
2178         }
2179         case KVM_CREATE_IRQCHIP: {
2180                 struct kvm_irq_routing_entry routing;
2181
2182                 r = -EINVAL;
2183                 if (kvm->arch.use_irqchip) {
2184                         /* Set up dummy routing. */
2185                         memset(&routing, 0, sizeof(routing));
2186                         r = kvm_set_irq_routing(kvm, &routing, 0, 0);
2187                 }
2188                 break;
2189         }
2190         case KVM_SET_DEVICE_ATTR: {
2191                 r = -EFAULT;
2192                 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2193                         break;
2194                 r = kvm_s390_vm_set_attr(kvm, &attr);
2195                 break;
2196         }
2197         case KVM_GET_DEVICE_ATTR: {
2198                 r = -EFAULT;
2199                 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2200                         break;
2201                 r = kvm_s390_vm_get_attr(kvm, &attr);
2202                 break;
2203         }
2204         case KVM_HAS_DEVICE_ATTR: {
2205                 r = -EFAULT;
2206                 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2207                         break;
2208                 r = kvm_s390_vm_has_attr(kvm, &attr);
2209                 break;
2210         }
2211         case KVM_S390_GET_SKEYS: {
2212                 struct kvm_s390_skeys args;
2213
2214                 r = -EFAULT;
2215                 if (copy_from_user(&args, argp,
2216                                    sizeof(struct kvm_s390_skeys)))
2217                         break;
2218                 r = kvm_s390_get_skeys(kvm, &args);
2219                 break;
2220         }
2221         case KVM_S390_SET_SKEYS: {
2222                 struct kvm_s390_skeys args;
2223
2224                 r = -EFAULT;
2225                 if (copy_from_user(&args, argp,
2226                                    sizeof(struct kvm_s390_skeys)))
2227                         break;
2228                 r = kvm_s390_set_skeys(kvm, &args);
2229                 break;
2230         }
2231         case KVM_S390_GET_CMMA_BITS: {
2232                 struct kvm_s390_cmma_log args;
2233
2234                 r = -EFAULT;
2235                 if (copy_from_user(&args, argp, sizeof(args)))
2236                         break;
2237                 mutex_lock(&kvm->slots_lock);
2238                 r = kvm_s390_get_cmma_bits(kvm, &args);
2239                 mutex_unlock(&kvm->slots_lock);
2240                 if (!r) {
2241                         r = copy_to_user(argp, &args, sizeof(args));
2242                         if (r)
2243                                 r = -EFAULT;
2244                 }
2245                 break;
2246         }
2247         case KVM_S390_SET_CMMA_BITS: {
2248                 struct kvm_s390_cmma_log args;
2249
2250                 r = -EFAULT;
2251                 if (copy_from_user(&args, argp, sizeof(args)))
2252                         break;
2253                 mutex_lock(&kvm->slots_lock);
2254                 r = kvm_s390_set_cmma_bits(kvm, &args);
2255                 mutex_unlock(&kvm->slots_lock);
2256                 break;
2257         }
2258         default:
2259                 r = -ENOTTY;
2260         }
2261
2262         return r;
2263 }
2264
2265 static int kvm_s390_apxa_installed(void)
2266 {
2267         struct ap_config_info info;
2268
2269         if (ap_instructions_available()) {
2270                 if (ap_qci(&info) == 0)
2271                         return info.apxa;
2272         }
2273
2274         return 0;
2275 }
2276
2277 /*
2278  * The format of the crypto control block (CRYCB) is specified in the 3 low
2279  * order bits of the CRYCB designation (CRYCBD) field as follows:
2280  * Format 0: Neither the message security assist extension 3 (MSAX3) nor the
2281  *           AP extended addressing (APXA) facility are installed.
2282  * Format 1: The APXA facility is not installed but the MSAX3 facility is.
2283  * Format 2: Both the APXA and MSAX3 facilities are installed
2284  */
2285 static void kvm_s390_set_crycb_format(struct kvm *kvm)
2286 {
2287         kvm->arch.crypto.crycbd = (__u32)(unsigned long) kvm->arch.crypto.crycb;
2288
2289         /* Clear the CRYCB format bits - i.e., set format 0 by default */
2290         kvm->arch.crypto.crycbd &= ~(CRYCB_FORMAT_MASK);
2291
2292         /* Check whether MSAX3 is installed */
2293         if (!test_kvm_facility(kvm, 76))
2294                 return;
2295
2296         if (kvm_s390_apxa_installed())
2297                 kvm->arch.crypto.crycbd |= CRYCB_FORMAT2;
2298         else
2299                 kvm->arch.crypto.crycbd |= CRYCB_FORMAT1;
2300 }
2301
2302 void kvm_arch_crypto_set_masks(struct kvm *kvm, unsigned long *apm,
2303                                unsigned long *aqm, unsigned long *adm)
2304 {
2305         struct kvm_s390_crypto_cb *crycb = kvm->arch.crypto.crycb;
2306
2307         mutex_lock(&kvm->lock);
2308         kvm_s390_vcpu_block_all(kvm);
2309
2310         switch (kvm->arch.crypto.crycbd & CRYCB_FORMAT_MASK) {
2311         case CRYCB_FORMAT2: /* APCB1 use 256 bits */
2312                 memcpy(crycb->apcb1.apm, apm, 32);
2313                 VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx %016lx %016lx %016lx",
2314                          apm[0], apm[1], apm[2], apm[3]);
2315                 memcpy(crycb->apcb1.aqm, aqm, 32);
2316                 VM_EVENT(kvm, 3, "SET CRYCB: aqm %016lx %016lx %016lx %016lx",
2317                          aqm[0], aqm[1], aqm[2], aqm[3]);
2318                 memcpy(crycb->apcb1.adm, adm, 32);
2319                 VM_EVENT(kvm, 3, "SET CRYCB: adm %016lx %016lx %016lx %016lx",
2320                          adm[0], adm[1], adm[2], adm[3]);
2321                 break;
2322         case CRYCB_FORMAT1:
2323         case CRYCB_FORMAT0: /* Fall through both use APCB0 */
2324                 memcpy(crycb->apcb0.apm, apm, 8);
2325                 memcpy(crycb->apcb0.aqm, aqm, 2);
2326                 memcpy(crycb->apcb0.adm, adm, 2);
2327                 VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx aqm %04x adm %04x",
2328                          apm[0], *((unsigned short *)aqm),
2329                          *((unsigned short *)adm));
2330                 break;
2331         default:        /* Can not happen */
2332                 break;
2333         }
2334
2335         /* recreate the shadow crycb for each vcpu */
2336         kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART);
2337         kvm_s390_vcpu_unblock_all(kvm);
2338         mutex_unlock(&kvm->lock);
2339 }
2340 EXPORT_SYMBOL_GPL(kvm_arch_crypto_set_masks);
2341
2342 void kvm_arch_crypto_clear_masks(struct kvm *kvm)
2343 {
2344         mutex_lock(&kvm->lock);
2345         kvm_s390_vcpu_block_all(kvm);
2346
2347         memset(&kvm->arch.crypto.crycb->apcb0, 0,
2348                sizeof(kvm->arch.crypto.crycb->apcb0));
2349         memset(&kvm->arch.crypto.crycb->apcb1, 0,
2350                sizeof(kvm->arch.crypto.crycb->apcb1));
2351
2352         VM_EVENT(kvm, 3, "%s", "CLR CRYCB:");
2353         /* recreate the shadow crycb for each vcpu */
2354         kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART);
2355         kvm_s390_vcpu_unblock_all(kvm);
2356         mutex_unlock(&kvm->lock);
2357 }
2358 EXPORT_SYMBOL_GPL(kvm_arch_crypto_clear_masks);
2359
2360 static u64 kvm_s390_get_initial_cpuid(void)
2361 {
2362         struct cpuid cpuid;
2363
2364         get_cpu_id(&cpuid);
2365         cpuid.version = 0xff;
2366         return *((u64 *) &cpuid);
2367 }
2368
2369 static void kvm_s390_crypto_init(struct kvm *kvm)
2370 {
2371         kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb;
2372         kvm_s390_set_crycb_format(kvm);
2373
2374         if (!test_kvm_facility(kvm, 76))
2375                 return;
2376
2377         /* Enable AES/DEA protected key functions by default */
2378         kvm->arch.crypto.aes_kw = 1;
2379         kvm->arch.crypto.dea_kw = 1;
2380         get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask,
2381                          sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
2382         get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask,
2383                          sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
2384 }
2385
2386 static void sca_dispose(struct kvm *kvm)
2387 {
2388         if (kvm->arch.use_esca)
2389                 free_pages_exact(kvm->arch.sca, sizeof(struct esca_block));
2390         else
2391                 free_page((unsigned long)(kvm->arch.sca));
2392         kvm->arch.sca = NULL;
2393 }
2394
2395 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
2396 {
2397         gfp_t alloc_flags = GFP_KERNEL;
2398         int i, rc;
2399         char debug_name[16];
2400         static unsigned long sca_offset;
2401
2402         rc = -EINVAL;
2403 #ifdef CONFIG_KVM_S390_UCONTROL
2404         if (type & ~KVM_VM_S390_UCONTROL)
2405                 goto out_err;
2406         if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN)))
2407                 goto out_err;
2408 #else
2409         if (type)
2410                 goto out_err;
2411 #endif
2412
2413         rc = s390_enable_sie();
2414         if (rc)
2415                 goto out_err;
2416
2417         rc = -ENOMEM;
2418
2419         if (!sclp.has_64bscao)
2420                 alloc_flags |= GFP_DMA;
2421         rwlock_init(&kvm->arch.sca_lock);
2422         /* start with basic SCA */
2423         kvm->arch.sca = (struct bsca_block *) get_zeroed_page(alloc_flags);
2424         if (!kvm->arch.sca)
2425                 goto out_err;
2426         mutex_lock(&kvm_lock);
2427         sca_offset += 16;
2428         if (sca_offset + sizeof(struct bsca_block) > PAGE_SIZE)
2429                 sca_offset = 0;
2430         kvm->arch.sca = (struct bsca_block *)
2431                         ((char *) kvm->arch.sca + sca_offset);
2432         mutex_unlock(&kvm_lock);
2433
2434         sprintf(debug_name, "kvm-%u", current->pid);
2435
2436         kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long));
2437         if (!kvm->arch.dbf)
2438                 goto out_err;
2439
2440         BUILD_BUG_ON(sizeof(struct sie_page2) != 4096);
2441         kvm->arch.sie_page2 =
2442              (struct sie_page2 *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
2443         if (!kvm->arch.sie_page2)
2444                 goto out_err;
2445
2446         kvm->arch.sie_page2->kvm = kvm;
2447         kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list;
2448
2449         for (i = 0; i < kvm_s390_fac_size(); i++) {
2450                 kvm->arch.model.fac_mask[i] = S390_lowcore.stfle_fac_list[i] &
2451                                               (kvm_s390_fac_base[i] |
2452                                                kvm_s390_fac_ext[i]);
2453                 kvm->arch.model.fac_list[i] = S390_lowcore.stfle_fac_list[i] &
2454                                               kvm_s390_fac_base[i];
2455         }
2456         kvm->arch.model.subfuncs = kvm_s390_available_subfunc;
2457
2458         /* we are always in czam mode - even on pre z14 machines */
2459         set_kvm_facility(kvm->arch.model.fac_mask, 138);
2460         set_kvm_facility(kvm->arch.model.fac_list, 138);
2461         /* we emulate STHYI in kvm */
2462         set_kvm_facility(kvm->arch.model.fac_mask, 74);
2463         set_kvm_facility(kvm->arch.model.fac_list, 74);
2464         if (MACHINE_HAS_TLB_GUEST) {
2465                 set_kvm_facility(kvm->arch.model.fac_mask, 147);
2466                 set_kvm_facility(kvm->arch.model.fac_list, 147);
2467         }
2468
2469         if (css_general_characteristics.aiv && test_facility(65))
2470                 set_kvm_facility(kvm->arch.model.fac_mask, 65);
2471
2472         kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid();
2473         kvm->arch.model.ibc = sclp.ibc & 0x0fff;
2474
2475         kvm_s390_crypto_init(kvm);
2476
2477         mutex_init(&kvm->arch.float_int.ais_lock);
2478         spin_lock_init(&kvm->arch.float_int.lock);
2479         for (i = 0; i < FIRQ_LIST_COUNT; i++)
2480                 INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]);
2481         init_waitqueue_head(&kvm->arch.ipte_wq);
2482         mutex_init(&kvm->arch.ipte_mutex);
2483
2484         debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
2485         VM_EVENT(kvm, 3, "vm created with type %lu", type);
2486
2487         if (type & KVM_VM_S390_UCONTROL) {
2488                 kvm->arch.gmap = NULL;
2489                 kvm->arch.mem_limit = KVM_S390_NO_MEM_LIMIT;
2490         } else {
2491                 if (sclp.hamax == U64_MAX)
2492                         kvm->arch.mem_limit = TASK_SIZE_MAX;
2493                 else
2494                         kvm->arch.mem_limit = min_t(unsigned long, TASK_SIZE_MAX,
2495                                                     sclp.hamax + 1);
2496                 kvm->arch.gmap = gmap_create(current->mm, kvm->arch.mem_limit - 1);
2497                 if (!kvm->arch.gmap)
2498                         goto out_err;
2499                 kvm->arch.gmap->private = kvm;
2500                 kvm->arch.gmap->pfault_enabled = 0;
2501         }
2502
2503         kvm->arch.use_pfmfi = sclp.has_pfmfi;
2504         kvm->arch.use_skf = sclp.has_skey;
2505         spin_lock_init(&kvm->arch.start_stop_lock);
2506         kvm_s390_vsie_init(kvm);
2507         kvm_s390_gisa_init(kvm);
2508         KVM_EVENT(3, "vm 0x%pK created by pid %u", kvm, current->pid);
2509
2510         return 0;
2511 out_err:
2512         free_page((unsigned long)kvm->arch.sie_page2);
2513         debug_unregister(kvm->arch.dbf);
2514         sca_dispose(kvm);
2515         KVM_EVENT(3, "creation of vm failed: %d", rc);
2516         return rc;
2517 }
2518
2519 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
2520 {
2521         VCPU_EVENT(vcpu, 3, "%s", "free cpu");
2522         trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
2523         kvm_s390_clear_local_irqs(vcpu);
2524         kvm_clear_async_pf_completion_queue(vcpu);
2525         if (!kvm_is_ucontrol(vcpu->kvm))
2526                 sca_del_vcpu(vcpu);
2527
2528         if (kvm_is_ucontrol(vcpu->kvm))
2529                 gmap_remove(vcpu->arch.gmap);
2530
2531         if (vcpu->kvm->arch.use_cmma)
2532                 kvm_s390_vcpu_unsetup_cmma(vcpu);
2533         free_page((unsigned long)(vcpu->arch.sie_block));
2534 }
2535
2536 static void kvm_free_vcpus(struct kvm *kvm)
2537 {
2538         unsigned int i;
2539         struct kvm_vcpu *vcpu;
2540
2541         kvm_for_each_vcpu(i, vcpu, kvm)
2542                 kvm_vcpu_destroy(vcpu);
2543
2544         mutex_lock(&kvm->lock);
2545         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
2546                 kvm->vcpus[i] = NULL;
2547
2548         atomic_set(&kvm->online_vcpus, 0);
2549         mutex_unlock(&kvm->lock);
2550 }
2551
2552 void kvm_arch_destroy_vm(struct kvm *kvm)
2553 {
2554         kvm_free_vcpus(kvm);
2555         sca_dispose(kvm);
2556         debug_unregister(kvm->arch.dbf);
2557         kvm_s390_gisa_destroy(kvm);
2558         free_page((unsigned long)kvm->arch.sie_page2);
2559         if (!kvm_is_ucontrol(kvm))
2560                 gmap_remove(kvm->arch.gmap);
2561         kvm_s390_destroy_adapters(kvm);
2562         kvm_s390_clear_float_irqs(kvm);
2563         kvm_s390_vsie_destroy(kvm);
2564         KVM_EVENT(3, "vm 0x%pK destroyed", kvm);
2565 }
2566
2567 /* Section: vcpu related */
2568 static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu)
2569 {
2570         vcpu->arch.gmap = gmap_create(current->mm, -1UL);
2571         if (!vcpu->arch.gmap)
2572                 return -ENOMEM;
2573         vcpu->arch.gmap->private = vcpu->kvm;
2574
2575         return 0;
2576 }
2577
2578 static void sca_del_vcpu(struct kvm_vcpu *vcpu)
2579 {
2580         if (!kvm_s390_use_sca_entries())
2581                 return;
2582         read_lock(&vcpu->kvm->arch.sca_lock);
2583         if (vcpu->kvm->arch.use_esca) {
2584                 struct esca_block *sca = vcpu->kvm->arch.sca;
2585
2586                 clear_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
2587                 sca->cpu[vcpu->vcpu_id].sda = 0;
2588         } else {
2589                 struct bsca_block *sca = vcpu->kvm->arch.sca;
2590
2591                 clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
2592                 sca->cpu[vcpu->vcpu_id].sda = 0;
2593         }
2594         read_unlock(&vcpu->kvm->arch.sca_lock);
2595 }
2596
2597 static void sca_add_vcpu(struct kvm_vcpu *vcpu)
2598 {
2599         if (!kvm_s390_use_sca_entries()) {
2600                 struct bsca_block *sca = vcpu->kvm->arch.sca;
2601
2602                 /* we still need the basic sca for the ipte control */
2603                 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
2604                 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
2605                 return;
2606         }
2607         read_lock(&vcpu->kvm->arch.sca_lock);
2608         if (vcpu->kvm->arch.use_esca) {
2609                 struct esca_block *sca = vcpu->kvm->arch.sca;
2610
2611                 sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
2612                 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
2613                 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca & ~0x3fU;
2614                 vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
2615                 set_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
2616         } else {
2617                 struct bsca_block *sca = vcpu->kvm->arch.sca;
2618
2619                 sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
2620                 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
2621                 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
2622                 set_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
2623         }
2624         read_unlock(&vcpu->kvm->arch.sca_lock);
2625 }
2626
2627 /* Basic SCA to Extended SCA data copy routines */
2628 static inline void sca_copy_entry(struct esca_entry *d, struct bsca_entry *s)
2629 {
2630         d->sda = s->sda;
2631         d->sigp_ctrl.c = s->sigp_ctrl.c;
2632         d->sigp_ctrl.scn = s->sigp_ctrl.scn;
2633 }
2634
2635 static void sca_copy_b_to_e(struct esca_block *d, struct bsca_block *s)
2636 {
2637         int i;
2638
2639         d->ipte_control = s->ipte_control;
2640         d->mcn[0] = s->mcn;
2641         for (i = 0; i < KVM_S390_BSCA_CPU_SLOTS; i++)
2642                 sca_copy_entry(&d->cpu[i], &s->cpu[i]);
2643 }
2644
2645 static int sca_switch_to_extended(struct kvm *kvm)
2646 {
2647         struct bsca_block *old_sca = kvm->arch.sca;
2648         struct esca_block *new_sca;
2649         struct kvm_vcpu *vcpu;
2650         unsigned int vcpu_idx;
2651         u32 scaol, scaoh;
2652
2653         new_sca = alloc_pages_exact(sizeof(*new_sca), GFP_KERNEL|__GFP_ZERO);
2654         if (!new_sca)
2655                 return -ENOMEM;
2656
2657         scaoh = (u32)((u64)(new_sca) >> 32);
2658         scaol = (u32)(u64)(new_sca) & ~0x3fU;
2659
2660         kvm_s390_vcpu_block_all(kvm);
2661         write_lock(&kvm->arch.sca_lock);
2662
2663         sca_copy_b_to_e(new_sca, old_sca);
2664
2665         kvm_for_each_vcpu(vcpu_idx, vcpu, kvm) {
2666                 vcpu->arch.sie_block->scaoh = scaoh;
2667                 vcpu->arch.sie_block->scaol = scaol;
2668                 vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
2669         }
2670         kvm->arch.sca = new_sca;
2671         kvm->arch.use_esca = 1;
2672
2673         write_unlock(&kvm->arch.sca_lock);
2674         kvm_s390_vcpu_unblock_all(kvm);
2675
2676         free_page((unsigned long)old_sca);
2677
2678         VM_EVENT(kvm, 2, "Switched to ESCA (0x%pK -> 0x%pK)",
2679                  old_sca, kvm->arch.sca);
2680         return 0;
2681 }
2682
2683 static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)
2684 {
2685         int rc;
2686
2687         if (!kvm_s390_use_sca_entries()) {
2688                 if (id < KVM_MAX_VCPUS)
2689                         return true;
2690                 return false;
2691         }
2692         if (id < KVM_S390_BSCA_CPU_SLOTS)
2693                 return true;
2694         if (!sclp.has_esca || !sclp.has_64bscao)
2695                 return false;
2696
2697         mutex_lock(&kvm->lock);
2698         rc = kvm->arch.use_esca ? 0 : sca_switch_to_extended(kvm);
2699         mutex_unlock(&kvm->lock);
2700
2701         return rc == 0 && id < KVM_S390_ESCA_CPU_SLOTS;
2702 }
2703
2704 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2705 static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2706 {
2707         WARN_ON_ONCE(vcpu->arch.cputm_start != 0);
2708         raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2709         vcpu->arch.cputm_start = get_tod_clock_fast();
2710         raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2711 }
2712
2713 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2714 static void __stop_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2715 {
2716         WARN_ON_ONCE(vcpu->arch.cputm_start == 0);
2717         raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2718         vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start;
2719         vcpu->arch.cputm_start = 0;
2720         raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2721 }
2722
2723 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2724 static void __enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2725 {
2726         WARN_ON_ONCE(vcpu->arch.cputm_enabled);
2727         vcpu->arch.cputm_enabled = true;
2728         __start_cpu_timer_accounting(vcpu);
2729 }
2730
2731 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2732 static void __disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2733 {
2734         WARN_ON_ONCE(!vcpu->arch.cputm_enabled);
2735         __stop_cpu_timer_accounting(vcpu);
2736         vcpu->arch.cputm_enabled = false;
2737 }
2738
2739 static void enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2740 {
2741         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2742         __enable_cpu_timer_accounting(vcpu);
2743         preempt_enable();
2744 }
2745
2746 static void disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2747 {
2748         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2749         __disable_cpu_timer_accounting(vcpu);
2750         preempt_enable();
2751 }
2752
2753 /* set the cpu timer - may only be called from the VCPU thread itself */
2754 void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm)
2755 {
2756         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2757         raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2758         if (vcpu->arch.cputm_enabled)
2759                 vcpu->arch.cputm_start = get_tod_clock_fast();
2760         vcpu->arch.sie_block->cputm = cputm;
2761         raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2762         preempt_enable();
2763 }
2764
2765 /* update and get the cpu timer - can also be called from other VCPU threads */
2766 __u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu)
2767 {
2768         unsigned int seq;
2769         __u64 value;
2770
2771         if (unlikely(!vcpu->arch.cputm_enabled))
2772                 return vcpu->arch.sie_block->cputm;
2773
2774         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2775         do {
2776                 seq = raw_read_seqcount(&vcpu->arch.cputm_seqcount);
2777                 /*
2778                  * If the writer would ever execute a read in the critical
2779                  * section, e.g. in irq context, we have a deadlock.
2780                  */
2781                 WARN_ON_ONCE((seq & 1) && smp_processor_id() == vcpu->cpu);
2782                 value = vcpu->arch.sie_block->cputm;
2783                 /* if cputm_start is 0, accounting is being started/stopped */
2784                 if (likely(vcpu->arch.cputm_start))
2785                         value -= get_tod_clock_fast() - vcpu->arch.cputm_start;
2786         } while (read_seqcount_retry(&vcpu->arch.cputm_seqcount, seq & ~1));
2787         preempt_enable();
2788         return value;
2789 }
2790
2791 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
2792 {
2793
2794         gmap_enable(vcpu->arch.enabled_gmap);
2795         kvm_s390_set_cpuflags(vcpu, CPUSTAT_RUNNING);
2796         if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
2797                 __start_cpu_timer_accounting(vcpu);
2798         vcpu->cpu = cpu;
2799 }
2800
2801 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
2802 {
2803         vcpu->cpu = -1;
2804         if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
2805                 __stop_cpu_timer_accounting(vcpu);
2806         kvm_s390_clear_cpuflags(vcpu, CPUSTAT_RUNNING);
2807         vcpu->arch.enabled_gmap = gmap_get_enabled();
2808         gmap_disable(vcpu->arch.enabled_gmap);
2809
2810 }
2811
2812 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
2813 {
2814         mutex_lock(&vcpu->kvm->lock);
2815         preempt_disable();
2816         vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch;
2817         vcpu->arch.sie_block->epdx = vcpu->kvm->arch.epdx;
2818         preempt_enable();
2819         mutex_unlock(&vcpu->kvm->lock);
2820         if (!kvm_is_ucontrol(vcpu->kvm)) {
2821                 vcpu->arch.gmap = vcpu->kvm->arch.gmap;
2822                 sca_add_vcpu(vcpu);
2823         }
2824         if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0)
2825                 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
2826         /* make vcpu_load load the right gmap on the first trigger */
2827         vcpu->arch.enabled_gmap = vcpu->arch.gmap;
2828 }
2829
2830 static bool kvm_has_pckmo_subfunc(struct kvm *kvm, unsigned long nr)
2831 {
2832         if (test_bit_inv(nr, (unsigned long *)&kvm->arch.model.subfuncs.pckmo) &&
2833             test_bit_inv(nr, (unsigned long *)&kvm_s390_available_subfunc.pckmo))
2834                 return true;
2835         return false;
2836 }
2837
2838 static bool kvm_has_pckmo_ecc(struct kvm *kvm)
2839 {
2840         /* At least one ECC subfunction must be present */
2841         return kvm_has_pckmo_subfunc(kvm, 32) ||
2842                kvm_has_pckmo_subfunc(kvm, 33) ||
2843                kvm_has_pckmo_subfunc(kvm, 34) ||
2844                kvm_has_pckmo_subfunc(kvm, 40) ||
2845                kvm_has_pckmo_subfunc(kvm, 41);
2846
2847 }
2848
2849 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
2850 {
2851         /*
2852          * If the AP instructions are not being interpreted and the MSAX3
2853          * facility is not configured for the guest, there is nothing to set up.
2854          */
2855         if (!vcpu->kvm->arch.crypto.apie && !test_kvm_facility(vcpu->kvm, 76))
2856                 return;
2857
2858         vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd;
2859         vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA);
2860         vcpu->arch.sie_block->eca &= ~ECA_APIE;
2861         vcpu->arch.sie_block->ecd &= ~ECD_ECC;
2862
2863         if (vcpu->kvm->arch.crypto.apie)
2864                 vcpu->arch.sie_block->eca |= ECA_APIE;
2865
2866         /* Set up protected key support */
2867         if (vcpu->kvm->arch.crypto.aes_kw) {
2868                 vcpu->arch.sie_block->ecb3 |= ECB3_AES;
2869                 /* ecc is also wrapped with AES key */
2870                 if (kvm_has_pckmo_ecc(vcpu->kvm))
2871                         vcpu->arch.sie_block->ecd |= ECD_ECC;
2872         }
2873
2874         if (vcpu->kvm->arch.crypto.dea_kw)
2875                 vcpu->arch.sie_block->ecb3 |= ECB3_DEA;
2876 }
2877
2878 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu)
2879 {
2880         free_page(vcpu->arch.sie_block->cbrlo);
2881         vcpu->arch.sie_block->cbrlo = 0;
2882 }
2883
2884 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu)
2885 {
2886         vcpu->arch.sie_block->cbrlo = get_zeroed_page(GFP_KERNEL);
2887         if (!vcpu->arch.sie_block->cbrlo)
2888                 return -ENOMEM;
2889         return 0;
2890 }
2891
2892 static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu)
2893 {
2894         struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model;
2895
2896         vcpu->arch.sie_block->ibc = model->ibc;
2897         if (test_kvm_facility(vcpu->kvm, 7))
2898                 vcpu->arch.sie_block->fac = (u32)(u64) model->fac_list;
2899 }
2900
2901 static int kvm_s390_vcpu_setup(struct kvm_vcpu *vcpu)
2902 {
2903         int rc = 0;
2904
2905         atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
2906                                                     CPUSTAT_SM |
2907                                                     CPUSTAT_STOPPED);
2908
2909         if (test_kvm_facility(vcpu->kvm, 78))
2910                 kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED2);
2911         else if (test_kvm_facility(vcpu->kvm, 8))
2912                 kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED);
2913
2914         kvm_s390_vcpu_setup_model(vcpu);
2915
2916         /* pgste_set_pte has special handling for !MACHINE_HAS_ESOP */
2917         if (MACHINE_HAS_ESOP)
2918                 vcpu->arch.sie_block->ecb |= ECB_HOSTPROTINT;
2919         if (test_kvm_facility(vcpu->kvm, 9))
2920                 vcpu->arch.sie_block->ecb |= ECB_SRSI;
2921         if (test_kvm_facility(vcpu->kvm, 73))
2922                 vcpu->arch.sie_block->ecb |= ECB_TE;
2923
2924         if (test_kvm_facility(vcpu->kvm, 8) && vcpu->kvm->arch.use_pfmfi)
2925                 vcpu->arch.sie_block->ecb2 |= ECB2_PFMFI;
2926         if (test_kvm_facility(vcpu->kvm, 130))
2927                 vcpu->arch.sie_block->ecb2 |= ECB2_IEP;
2928         vcpu->arch.sie_block->eca = ECA_MVPGI | ECA_PROTEXCI;
2929         if (sclp.has_cei)
2930                 vcpu->arch.sie_block->eca |= ECA_CEI;
2931         if (sclp.has_ib)
2932                 vcpu->arch.sie_block->eca |= ECA_IB;
2933         if (sclp.has_siif)
2934                 vcpu->arch.sie_block->eca |= ECA_SII;
2935         if (sclp.has_sigpif)
2936                 vcpu->arch.sie_block->eca |= ECA_SIGPI;
2937         if (test_kvm_facility(vcpu->kvm, 129)) {
2938                 vcpu->arch.sie_block->eca |= ECA_VX;
2939                 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
2940         }
2941         if (test_kvm_facility(vcpu->kvm, 139))
2942                 vcpu->arch.sie_block->ecd |= ECD_MEF;
2943         if (test_kvm_facility(vcpu->kvm, 156))
2944                 vcpu->arch.sie_block->ecd |= ECD_ETOKENF;
2945         if (vcpu->arch.sie_block->gd) {
2946                 vcpu->arch.sie_block->eca |= ECA_AIV;
2947                 VCPU_EVENT(vcpu, 3, "AIV gisa format-%u enabled for cpu %03u",
2948                            vcpu->arch.sie_block->gd & 0x3, vcpu->vcpu_id);
2949         }
2950         vcpu->arch.sie_block->sdnxo = ((unsigned long) &vcpu->run->s.regs.sdnx)
2951                                         | SDNXC;
2952         vcpu->arch.sie_block->riccbd = (unsigned long) &vcpu->run->s.regs.riccb;
2953
2954         if (sclp.has_kss)
2955                 kvm_s390_set_cpuflags(vcpu, CPUSTAT_KSS);
2956         else
2957                 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
2958
2959         if (vcpu->kvm->arch.use_cmma) {
2960                 rc = kvm_s390_vcpu_setup_cmma(vcpu);
2961                 if (rc)
2962                         return rc;
2963         }
2964         hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
2965         vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
2966
2967         vcpu->arch.sie_block->hpid = HPID_KVM;
2968
2969         kvm_s390_vcpu_crypto_setup(vcpu);
2970
2971         return rc;
2972 }
2973
2974 int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
2975 {
2976         if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id))
2977                 return -EINVAL;
2978         return 0;
2979 }
2980
2981 int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
2982 {
2983         struct sie_page *sie_page;
2984         int rc;
2985
2986         BUILD_BUG_ON(sizeof(struct sie_page) != 4096);
2987         sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL);
2988         if (!sie_page)
2989                 return -ENOMEM;
2990
2991         vcpu->arch.sie_block = &sie_page->sie_block;
2992         vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb;
2993
2994         /* the real guest size will always be smaller than msl */
2995         vcpu->arch.sie_block->mso = 0;
2996         vcpu->arch.sie_block->msl = sclp.hamax;
2997
2998         vcpu->arch.sie_block->icpua = vcpu->vcpu_id;
2999         spin_lock_init(&vcpu->arch.local_int.lock);
3000         vcpu->arch.sie_block->gd = (u32)(u64)vcpu->kvm->arch.gisa_int.origin;
3001         if (vcpu->arch.sie_block->gd && sclp.has_gisaf)
3002                 vcpu->arch.sie_block->gd |= GISA_FORMAT1;
3003         seqcount_init(&vcpu->arch.cputm_seqcount);
3004
3005         vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
3006         kvm_clear_async_pf_completion_queue(vcpu);
3007         vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
3008                                     KVM_SYNC_GPRS |
3009                                     KVM_SYNC_ACRS |
3010                                     KVM_SYNC_CRS |
3011                                     KVM_SYNC_ARCH0 |
3012                                     KVM_SYNC_PFAULT;
3013         kvm_s390_set_prefix(vcpu, 0);
3014         if (test_kvm_facility(vcpu->kvm, 64))
3015                 vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;
3016         if (test_kvm_facility(vcpu->kvm, 82))
3017                 vcpu->run->kvm_valid_regs |= KVM_SYNC_BPBC;
3018         if (test_kvm_facility(vcpu->kvm, 133))
3019                 vcpu->run->kvm_valid_regs |= KVM_SYNC_GSCB;
3020         if (test_kvm_facility(vcpu->kvm, 156))
3021                 vcpu->run->kvm_valid_regs |= KVM_SYNC_ETOKEN;
3022         /* fprs can be synchronized via vrs, even if the guest has no vx. With
3023          * MACHINE_HAS_VX, (load|store)_fpu_regs() will work with vrs format.
3024          */
3025         if (MACHINE_HAS_VX)
3026                 vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS;
3027         else
3028                 vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS;
3029
3030         if (kvm_is_ucontrol(vcpu->kvm)) {
3031                 rc = __kvm_ucontrol_vcpu_init(vcpu);
3032                 if (rc)
3033                         goto out_free_sie_block;
3034         }
3035
3036         VM_EVENT(vcpu->kvm, 3, "create cpu %d at 0x%pK, sie block at 0x%pK",
3037                  vcpu->vcpu_id, vcpu, vcpu->arch.sie_block);
3038         trace_kvm_s390_create_vcpu(vcpu->vcpu_id, vcpu, vcpu->arch.sie_block);
3039
3040         rc = kvm_s390_vcpu_setup(vcpu);
3041         if (rc)
3042                 goto out_ucontrol_uninit;
3043         return 0;
3044
3045 out_ucontrol_uninit:
3046         if (kvm_is_ucontrol(vcpu->kvm))
3047                 gmap_remove(vcpu->arch.gmap);
3048 out_free_sie_block:
3049         free_page((unsigned long)(vcpu->arch.sie_block));
3050         return rc;
3051 }
3052
3053 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
3054 {
3055         return kvm_s390_vcpu_has_irq(vcpu, 0);
3056 }
3057
3058 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
3059 {
3060         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE);
3061 }
3062
3063 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu)
3064 {
3065         atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
3066         exit_sie(vcpu);
3067 }
3068
3069 void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu)
3070 {
3071         atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
3072 }
3073
3074 static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu)
3075 {
3076         atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
3077         exit_sie(vcpu);
3078 }
3079
3080 bool kvm_s390_vcpu_sie_inhibited(struct kvm_vcpu *vcpu)
3081 {
3082         return atomic_read(&vcpu->arch.sie_block->prog20) &
3083                (PROG_BLOCK_SIE | PROG_REQUEST);
3084 }
3085
3086 static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu)
3087 {
3088         atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
3089 }
3090
3091 /*
3092  * Kick a guest cpu out of (v)SIE and wait until (v)SIE is not running.
3093  * If the CPU is not running (e.g. waiting as idle) the function will
3094  * return immediately. */
3095 void exit_sie(struct kvm_vcpu *vcpu)
3096 {
3097         kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
3098         kvm_s390_vsie_kick(vcpu);
3099         while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE)
3100                 cpu_relax();
3101 }
3102
3103 /* Kick a guest cpu out of SIE to process a request synchronously */
3104 void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu)
3105 {
3106         kvm_make_request(req, vcpu);
3107         kvm_s390_vcpu_request(vcpu);
3108 }
3109
3110 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
3111                               unsigned long end)
3112 {
3113         struct kvm *kvm = gmap->private;
3114         struct kvm_vcpu *vcpu;
3115         unsigned long prefix;
3116         int i;
3117
3118         if (gmap_is_shadow(gmap))
3119                 return;
3120         if (start >= 1UL << 31)
3121                 /* We are only interested in prefix pages */
3122                 return;
3123         kvm_for_each_vcpu(i, vcpu, kvm) {
3124                 /* match against both prefix pages */
3125                 prefix = kvm_s390_get_prefix(vcpu);
3126                 if (prefix <= end && start <= prefix + 2*PAGE_SIZE - 1) {
3127                         VCPU_EVENT(vcpu, 2, "gmap notifier for %lx-%lx",
3128                                    start, end);
3129                         kvm_s390_sync_request(KVM_REQ_MMU_RELOAD, vcpu);
3130                 }
3131         }
3132 }
3133
3134 bool kvm_arch_no_poll(struct kvm_vcpu *vcpu)
3135 {
3136         /* do not poll with more than halt_poll_max_steal percent of steal time */
3137         if (S390_lowcore.avg_steal_timer * 100 / (TICK_USEC << 12) >=
3138             halt_poll_max_steal) {
3139                 vcpu->stat.halt_no_poll_steal++;
3140                 return true;
3141         }
3142         return false;
3143 }
3144
3145 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
3146 {
3147         /* kvm common code refers to this, but never calls it */
3148         BUG();
3149         return 0;
3150 }
3151
3152 static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
3153                                            struct kvm_one_reg *reg)
3154 {
3155         int r = -EINVAL;
3156
3157         switch (reg->id) {
3158         case KVM_REG_S390_TODPR:
3159                 r = put_user(vcpu->arch.sie_block->todpr,
3160                              (u32 __user *)reg->addr);
3161                 break;
3162         case KVM_REG_S390_EPOCHDIFF:
3163                 r = put_user(vcpu->arch.sie_block->epoch,
3164                              (u64 __user *)reg->addr);
3165                 break;
3166         case KVM_REG_S390_CPU_TIMER:
3167                 r = put_user(kvm_s390_get_cpu_timer(vcpu),
3168                              (u64 __user *)reg->addr);
3169                 break;
3170         case KVM_REG_S390_CLOCK_COMP:
3171                 r = put_user(vcpu->arch.sie_block->ckc,
3172                              (u64 __user *)reg->addr);
3173                 break;
3174         case KVM_REG_S390_PFTOKEN:
3175                 r = put_user(vcpu->arch.pfault_token,
3176                              (u64 __user *)reg->addr);
3177                 break;
3178         case KVM_REG_S390_PFCOMPARE:
3179                 r = put_user(vcpu->arch.pfault_compare,
3180                              (u64 __user *)reg->addr);
3181                 break;
3182         case KVM_REG_S390_PFSELECT:
3183                 r = put_user(vcpu->arch.pfault_select,
3184                              (u64 __user *)reg->addr);
3185                 break;
3186         case KVM_REG_S390_PP:
3187                 r = put_user(vcpu->arch.sie_block->pp,
3188                              (u64 __user *)reg->addr);
3189                 break;
3190         case KVM_REG_S390_GBEA:
3191                 r = put_user(vcpu->arch.sie_block->gbea,
3192                              (u64 __user *)reg->addr);
3193                 break;
3194         default:
3195                 break;
3196         }
3197
3198         return r;
3199 }
3200
3201 static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
3202                                            struct kvm_one_reg *reg)
3203 {
3204         int r = -EINVAL;
3205         __u64 val;
3206
3207         switch (reg->id) {
3208         case KVM_REG_S390_TODPR:
3209                 r = get_user(vcpu->arch.sie_block->todpr,
3210                              (u32 __user *)reg->addr);
3211                 break;
3212         case KVM_REG_S390_EPOCHDIFF:
3213                 r = get_user(vcpu->arch.sie_block->epoch,
3214                              (u64 __user *)reg->addr);
3215                 break;
3216         case KVM_REG_S390_CPU_TIMER:
3217                 r = get_user(val, (u64 __user *)reg->addr);
3218                 if (!r)
3219                         kvm_s390_set_cpu_timer(vcpu, val);
3220                 break;
3221         case KVM_REG_S390_CLOCK_COMP:
3222                 r = get_user(vcpu->arch.sie_block->ckc,
3223                              (u64 __user *)reg->addr);
3224                 break;
3225         case KVM_REG_S390_PFTOKEN:
3226                 r = get_user(vcpu->arch.pfault_token,
3227                              (u64 __user *)reg->addr);
3228                 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
3229                         kvm_clear_async_pf_completion_queue(vcpu);
3230                 break;
3231         case KVM_REG_S390_PFCOMPARE:
3232                 r = get_user(vcpu->arch.pfault_compare,
3233                              (u64 __user *)reg->addr);
3234                 break;
3235         case KVM_REG_S390_PFSELECT:
3236                 r = get_user(vcpu->arch.pfault_select,
3237                              (u64 __user *)reg->addr);
3238                 break;
3239         case KVM_REG_S390_PP:
3240                 r = get_user(vcpu->arch.sie_block->pp,
3241                              (u64 __user *)reg->addr);
3242                 break;
3243         case KVM_REG_S390_GBEA:
3244                 r = get_user(vcpu->arch.sie_block->gbea,
3245                              (u64 __user *)reg->addr);
3246                 break;
3247         default:
3248                 break;
3249         }
3250
3251         return r;
3252 }
3253
3254 static void kvm_arch_vcpu_ioctl_normal_reset(struct kvm_vcpu *vcpu)
3255 {
3256         vcpu->arch.sie_block->gpsw.mask &= ~PSW_MASK_RI;
3257         vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
3258         memset(vcpu->run->s.regs.riccb, 0, sizeof(vcpu->run->s.regs.riccb));
3259
3260         kvm_clear_async_pf_completion_queue(vcpu);
3261         if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
3262                 kvm_s390_vcpu_stop(vcpu);
3263         kvm_s390_clear_local_irqs(vcpu);
3264 }
3265
3266 static void kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
3267 {
3268         /* Initial reset is a superset of the normal reset */
3269         kvm_arch_vcpu_ioctl_normal_reset(vcpu);
3270
3271         /* this equals initial cpu reset in pop, but we don't switch to ESA */
3272         vcpu->arch.sie_block->gpsw.mask = 0;
3273         vcpu->arch.sie_block->gpsw.addr = 0;
3274         kvm_s390_set_prefix(vcpu, 0);
3275         kvm_s390_set_cpu_timer(vcpu, 0);
3276         vcpu->arch.sie_block->ckc = 0;
3277         vcpu->arch.sie_block->todpr = 0;
3278         memset(vcpu->arch.sie_block->gcr, 0, sizeof(vcpu->arch.sie_block->gcr));
3279         vcpu->arch.sie_block->gcr[0] = CR0_INITIAL_MASK;
3280         vcpu->arch.sie_block->gcr[14] = CR14_INITIAL_MASK;
3281         vcpu->run->s.regs.fpc = 0;
3282         vcpu->arch.sie_block->gbea = 1;
3283         vcpu->arch.sie_block->pp = 0;
3284         vcpu->arch.sie_block->fpf &= ~FPF_BPBC;
3285 }
3286
3287 static void kvm_arch_vcpu_ioctl_clear_reset(struct kvm_vcpu *vcpu)
3288 {
3289         struct kvm_sync_regs *regs = &vcpu->run->s.regs;
3290
3291         /* Clear reset is a superset of the initial reset */
3292         kvm_arch_vcpu_ioctl_initial_reset(vcpu);
3293
3294         memset(&regs->gprs, 0, sizeof(regs->gprs));
3295         memset(&regs->vrs, 0, sizeof(regs->vrs));
3296         memset(&regs->acrs, 0, sizeof(regs->acrs));
3297         memset(&regs->gscb, 0, sizeof(regs->gscb));
3298
3299         regs->etoken = 0;
3300         regs->etoken_extension = 0;
3301 }
3302
3303 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
3304 {
3305         vcpu_load(vcpu);
3306         memcpy(&vcpu->run->s.regs.gprs, &regs->gprs, sizeof(regs->gprs));
3307         vcpu_put(vcpu);
3308         return 0;
3309 }
3310
3311 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
3312 {
3313         vcpu_load(vcpu);
3314         memcpy(&regs->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs));
3315         vcpu_put(vcpu);
3316         return 0;
3317 }
3318
3319 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
3320                                   struct kvm_sregs *sregs)
3321 {
3322         vcpu_load(vcpu);
3323
3324         memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs));
3325         memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));
3326
3327         vcpu_put(vcpu);
3328         return 0;
3329 }
3330
3331 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
3332                                   struct kvm_sregs *sregs)
3333 {
3334         vcpu_load(vcpu);
3335
3336         memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs));
3337         memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs));
3338
3339         vcpu_put(vcpu);
3340         return 0;
3341 }
3342
3343 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
3344 {
3345         int ret = 0;
3346
3347         vcpu_load(vcpu);
3348
3349         if (test_fp_ctl(fpu->fpc)) {
3350                 ret = -EINVAL;
3351                 goto out;
3352         }
3353         vcpu->run->s.regs.fpc = fpu->fpc;
3354         if (MACHINE_HAS_VX)
3355                 convert_fp_to_vx((__vector128 *) vcpu->run->s.regs.vrs,
3356                                  (freg_t *) fpu->fprs);
3357         else
3358                 memcpy(vcpu->run->s.regs.fprs, &fpu->fprs, sizeof(fpu->fprs));
3359
3360 out:
3361         vcpu_put(vcpu);
3362         return ret;
3363 }
3364
3365 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
3366 {
3367         vcpu_load(vcpu);
3368
3369         /* make sure we have the latest values */
3370         save_fpu_regs();
3371         if (MACHINE_HAS_VX)
3372                 convert_vx_to_fp((freg_t *) fpu->fprs,
3373                                  (__vector128 *) vcpu->run->s.regs.vrs);
3374         else
3375                 memcpy(fpu->fprs, vcpu->run->s.regs.fprs, sizeof(fpu->fprs));
3376         fpu->fpc = vcpu->run->s.regs.fpc;
3377
3378         vcpu_put(vcpu);
3379         return 0;
3380 }
3381
3382 static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
3383 {
3384         int rc = 0;
3385
3386         if (!is_vcpu_stopped(vcpu))
3387                 rc = -EBUSY;
3388         else {
3389                 vcpu->run->psw_mask = psw.mask;
3390                 vcpu->run->psw_addr = psw.addr;
3391         }
3392         return rc;
3393 }
3394
3395 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
3396                                   struct kvm_translation *tr)
3397 {
3398         return -EINVAL; /* not implemented yet */
3399 }
3400
3401 #define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \
3402                               KVM_GUESTDBG_USE_HW_BP | \
3403                               KVM_GUESTDBG_ENABLE)
3404
3405 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
3406                                         struct kvm_guest_debug *dbg)
3407 {
3408         int rc = 0;
3409
3410         vcpu_load(vcpu);
3411
3412         vcpu->guest_debug = 0;
3413         kvm_s390_clear_bp_data(vcpu);
3414
3415         if (dbg->control & ~VALID_GUESTDBG_FLAGS) {
3416                 rc = -EINVAL;
3417                 goto out;
3418         }
3419         if (!sclp.has_gpere) {
3420                 rc = -EINVAL;
3421                 goto out;
3422         }
3423
3424         if (dbg->control & KVM_GUESTDBG_ENABLE) {
3425                 vcpu->guest_debug = dbg->control;
3426                 /* enforce guest PER */
3427                 kvm_s390_set_cpuflags(vcpu, CPUSTAT_P);
3428
3429                 if (dbg->control & KVM_GUESTDBG_USE_HW_BP)
3430                         rc = kvm_s390_import_bp_data(vcpu, dbg);
3431         } else {
3432                 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P);
3433                 vcpu->arch.guestdbg.last_bp = 0;
3434         }
3435
3436         if (rc) {
3437                 vcpu->guest_debug = 0;
3438                 kvm_s390_clear_bp_data(vcpu);
3439                 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P);
3440         }
3441
3442 out:
3443         vcpu_put(vcpu);
3444         return rc;
3445 }
3446
3447 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
3448                                     struct kvm_mp_state *mp_state)
3449 {
3450         int ret;
3451
3452         vcpu_load(vcpu);
3453
3454         /* CHECK_STOP and LOAD are not supported yet */
3455         ret = is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED :
3456                                       KVM_MP_STATE_OPERATING;
3457
3458         vcpu_put(vcpu);
3459         return ret;
3460 }
3461
3462 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
3463                                     struct kvm_mp_state *mp_state)
3464 {
3465         int rc = 0;
3466
3467         vcpu_load(vcpu);
3468
3469         /* user space knows about this interface - let it control the state */
3470         vcpu->kvm->arch.user_cpu_state_ctrl = 1;
3471
3472         switch (mp_state->mp_state) {
3473         case KVM_MP_STATE_STOPPED:
3474                 kvm_s390_vcpu_stop(vcpu);
3475                 break;
3476         case KVM_MP_STATE_OPERATING:
3477                 kvm_s390_vcpu_start(vcpu);
3478                 break;
3479         case KVM_MP_STATE_LOAD:
3480         case KVM_MP_STATE_CHECK_STOP:
3481                 /* fall through - CHECK_STOP and LOAD are not supported yet */
3482         default:
3483                 rc = -ENXIO;
3484         }
3485
3486         vcpu_put(vcpu);
3487         return rc;
3488 }
3489
3490 static bool ibs_enabled(struct kvm_vcpu *vcpu)
3491 {
3492         return kvm_s390_test_cpuflags(vcpu, CPUSTAT_IBS);
3493 }
3494
3495 static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
3496 {
3497 retry:
3498         kvm_s390_vcpu_request_handled(vcpu);
3499         if (!kvm_request_pending(vcpu))
3500                 return 0;
3501         /*
3502          * We use MMU_RELOAD just to re-arm the ipte notifier for the
3503          * guest prefix page. gmap_mprotect_notify will wait on the ptl lock.
3504          * This ensures that the ipte instruction for this request has
3505          * already finished. We might race against a second unmapper that
3506          * wants to set the blocking bit. Lets just retry the request loop.
3507          */
3508         if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) {
3509                 int rc;
3510                 rc = gmap_mprotect_notify(vcpu->arch.gmap,
3511                                           kvm_s390_get_prefix(vcpu),
3512                                           PAGE_SIZE * 2, PROT_WRITE);
3513                 if (rc) {
3514                         kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
3515                         return rc;
3516                 }
3517                 goto retry;
3518         }
3519
3520         if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
3521                 vcpu->arch.sie_block->ihcpu = 0xffff;
3522                 goto retry;
3523         }
3524
3525         if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) {
3526                 if (!ibs_enabled(vcpu)) {
3527                         trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1);
3528                         kvm_s390_set_cpuflags(vcpu, CPUSTAT_IBS);
3529                 }
3530                 goto retry;
3531         }
3532
3533         if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) {
3534                 if (ibs_enabled(vcpu)) {
3535                         trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0);
3536                         kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IBS);
3537                 }
3538                 goto retry;
3539         }
3540
3541         if (kvm_check_request(KVM_REQ_ICPT_OPEREXC, vcpu)) {
3542                 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
3543                 goto retry;
3544         }
3545
3546         if (kvm_check_request(KVM_REQ_START_MIGRATION, vcpu)) {
3547                 /*
3548                  * Disable CMM virtualization; we will emulate the ESSA
3549                  * instruction manually, in order to provide additional
3550                  * functionalities needed for live migration.
3551                  */
3552                 vcpu->arch.sie_block->ecb2 &= ~ECB2_CMMA;
3553                 goto retry;
3554         }
3555
3556         if (kvm_check_request(KVM_REQ_STOP_MIGRATION, vcpu)) {
3557                 /*
3558                  * Re-enable CMM virtualization if CMMA is available and
3559                  * CMM has been used.
3560                  */
3561                 if ((vcpu->kvm->arch.use_cmma) &&
3562                     (vcpu->kvm->mm->context.uses_cmm))
3563                         vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
3564                 goto retry;
3565         }
3566
3567         /* nothing to do, just clear the request */
3568         kvm_clear_request(KVM_REQ_UNHALT, vcpu);
3569         /* we left the vsie handler, nothing to do, just clear the request */
3570         kvm_clear_request(KVM_REQ_VSIE_RESTART, vcpu);
3571
3572         return 0;
3573 }
3574
3575 void kvm_s390_set_tod_clock(struct kvm *kvm,
3576                             const struct kvm_s390_vm_tod_clock *gtod)
3577 {
3578         struct kvm_vcpu *vcpu;
3579         struct kvm_s390_tod_clock_ext htod;
3580         int i;
3581
3582         mutex_lock(&kvm->lock);
3583         preempt_disable();
3584
3585         get_tod_clock_ext((char *)&htod);
3586
3587         kvm->arch.epoch = gtod->tod - htod.tod;
3588         kvm->arch.epdx = 0;
3589         if (test_kvm_facility(kvm, 139)) {
3590                 kvm->arch.epdx = gtod->epoch_idx - htod.epoch_idx;
3591                 if (kvm->arch.epoch > gtod->tod)
3592                         kvm->arch.epdx -= 1;
3593         }
3594
3595         kvm_s390_vcpu_block_all(kvm);
3596         kvm_for_each_vcpu(i, vcpu, kvm) {
3597                 vcpu->arch.sie_block->epoch = kvm->arch.epoch;
3598                 vcpu->arch.sie_block->epdx  = kvm->arch.epdx;
3599         }
3600
3601         kvm_s390_vcpu_unblock_all(kvm);
3602         preempt_enable();
3603         mutex_unlock(&kvm->lock);
3604 }
3605
3606 /**
3607  * kvm_arch_fault_in_page - fault-in guest page if necessary
3608  * @vcpu: The corresponding virtual cpu
3609  * @gpa: Guest physical address
3610  * @writable: Whether the page should be writable or not
3611  *
3612  * Make sure that a guest page has been faulted-in on the host.
3613  *
3614  * Return: Zero on success, negative error code otherwise.
3615  */
3616 long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable)
3617 {
3618         return gmap_fault(vcpu->arch.gmap, gpa,
3619                           writable ? FAULT_FLAG_WRITE : 0);
3620 }
3621
3622 static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token,
3623                                       unsigned long token)
3624 {
3625         struct kvm_s390_interrupt inti;
3626         struct kvm_s390_irq irq;
3627
3628         if (start_token) {
3629                 irq.u.ext.ext_params2 = token;
3630                 irq.type = KVM_S390_INT_PFAULT_INIT;
3631                 WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq));
3632         } else {
3633                 inti.type = KVM_S390_INT_PFAULT_DONE;
3634                 inti.parm64 = token;
3635                 WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti));
3636         }
3637 }
3638
3639 void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
3640                                      struct kvm_async_pf *work)
3641 {
3642         trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token);
3643         __kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token);
3644 }
3645
3646 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
3647                                  struct kvm_async_pf *work)
3648 {
3649         trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token);
3650         __kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token);
3651 }
3652
3653 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu,
3654                                struct kvm_async_pf *work)
3655 {
3656         /* s390 will always inject the page directly */
3657 }
3658
3659 bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu)
3660 {
3661         /*
3662          * s390 will always inject the page directly,
3663          * but we still want check_async_completion to cleanup
3664          */
3665         return true;
3666 }
3667
3668 static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu)
3669 {
3670         hva_t hva;
3671         struct kvm_arch_async_pf arch;
3672         int rc;
3673
3674         if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
3675                 return 0;
3676         if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) !=
3677             vcpu->arch.pfault_compare)
3678                 return 0;
3679         if (psw_extint_disabled(vcpu))
3680                 return 0;
3681         if (kvm_s390_vcpu_has_irq(vcpu, 0))
3682                 return 0;
3683         if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK))
3684                 return 0;
3685         if (!vcpu->arch.gmap->pfault_enabled)
3686                 return 0;
3687
3688         hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr));
3689         hva += current->thread.gmap_addr & ~PAGE_MASK;
3690         if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8))
3691                 return 0;
3692
3693         rc = kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch);
3694         return rc;
3695 }
3696
3697 static int vcpu_pre_run(struct kvm_vcpu *vcpu)
3698 {
3699         int rc, cpuflags;
3700
3701         /*
3702          * On s390 notifications for arriving pages will be delivered directly
3703          * to the guest but the house keeping for completed pfaults is
3704          * handled outside the worker.
3705          */
3706         kvm_check_async_pf_completion(vcpu);
3707
3708         vcpu->arch.sie_block->gg14 = vcpu->run->s.regs.gprs[14];
3709         vcpu->arch.sie_block->gg15 = vcpu->run->s.regs.gprs[15];
3710
3711         if (need_resched())
3712                 schedule();
3713
3714         if (test_cpu_flag(CIF_MCCK_PENDING))
3715                 s390_handle_mcck();
3716
3717         if (!kvm_is_ucontrol(vcpu->kvm)) {
3718                 rc = kvm_s390_deliver_pending_interrupts(vcpu);
3719                 if (rc)
3720                         return rc;
3721         }
3722
3723         rc = kvm_s390_handle_requests(vcpu);
3724         if (rc)
3725                 return rc;
3726
3727         if (guestdbg_enabled(vcpu)) {
3728                 kvm_s390_backup_guest_per_regs(vcpu);
3729                 kvm_s390_patch_guest_per_regs(vcpu);
3730         }
3731
3732         clear_bit(vcpu->vcpu_id, vcpu->kvm->arch.gisa_int.kicked_mask);
3733
3734         vcpu->arch.sie_block->icptcode = 0;
3735         cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags);
3736         VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags);
3737         trace_kvm_s390_sie_enter(vcpu, cpuflags);
3738
3739         return 0;
3740 }
3741
3742 static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu)
3743 {
3744         struct kvm_s390_pgm_info pgm_info = {
3745                 .code = PGM_ADDRESSING,
3746         };
3747         u8 opcode, ilen;
3748         int rc;
3749
3750         VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction");
3751         trace_kvm_s390_sie_fault(vcpu);
3752
3753         /*
3754          * We want to inject an addressing exception, which is defined as a
3755          * suppressing or terminating exception. However, since we came here
3756          * by a DAT access exception, the PSW still points to the faulting
3757          * instruction since DAT exceptions are nullifying. So we've got
3758          * to look up the current opcode to get the length of the instruction
3759          * to be able to forward the PSW.
3760          */
3761         rc = read_guest_instr(vcpu, vcpu->arch.sie_block->gpsw.addr, &opcode, 1);
3762         ilen = insn_length(opcode);
3763         if (rc < 0) {
3764                 return rc;
3765         } else if (rc) {
3766                 /* Instruction-Fetching Exceptions - we can't detect the ilen.
3767                  * Forward by arbitrary ilc, injection will take care of
3768                  * nullification if necessary.
3769                  */
3770                 pgm_info = vcpu->arch.pgm;
3771                 ilen = 4;
3772         }
3773         pgm_info.flags = ilen | KVM_S390_PGM_FLAGS_ILC_VALID;
3774         kvm_s390_forward_psw(vcpu, ilen);
3775         return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
3776 }
3777
3778 static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason)
3779 {
3780         struct mcck_volatile_info *mcck_info;
3781         struct sie_page *sie_page;
3782
3783         VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
3784                    vcpu->arch.sie_block->icptcode);
3785         trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);
3786
3787         if (guestdbg_enabled(vcpu))
3788                 kvm_s390_restore_guest_per_regs(vcpu);
3789
3790         vcpu->run->s.regs.gprs[14] = vcpu->arch.sie_block->gg14;
3791         vcpu->run->s.regs.gprs[15] = vcpu->arch.sie_block->gg15;
3792
3793         if (exit_reason == -EINTR) {
3794                 VCPU_EVENT(vcpu, 3, "%s", "machine check");
3795                 sie_page = container_of(vcpu->arch.sie_block,
3796                                         struct sie_page, sie_block);
3797                 mcck_info = &sie_page->mcck_info;
3798                 kvm_s390_reinject_machine_check(vcpu, mcck_info);
3799                 return 0;
3800         }
3801
3802         if (vcpu->arch.sie_block->icptcode > 0) {
3803                 int rc = kvm_handle_sie_intercept(vcpu);
3804
3805                 if (rc != -EOPNOTSUPP)
3806                         return rc;
3807                 vcpu->run->exit_reason = KVM_EXIT_S390_SIEIC;
3808                 vcpu->run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode;
3809                 vcpu->run->s390_sieic.ipa = vcpu->arch.sie_block->ipa;
3810                 vcpu->run->s390_sieic.ipb = vcpu->arch.sie_block->ipb;
3811                 return -EREMOTE;
3812         } else if (exit_reason != -EFAULT) {
3813                 vcpu->stat.exit_null++;
3814                 return 0;
3815         } else if (kvm_is_ucontrol(vcpu->kvm)) {
3816                 vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL;
3817                 vcpu->run->s390_ucontrol.trans_exc_code =
3818                                                 current->thread.gmap_addr;
3819                 vcpu->run->s390_ucontrol.pgm_code = 0x10;
3820                 return -EREMOTE;
3821         } else if (current->thread.gmap_pfault) {
3822                 trace_kvm_s390_major_guest_pfault(vcpu);
3823                 current->thread.gmap_pfault = 0;
3824                 if (kvm_arch_setup_async_pf(vcpu))
3825                         return 0;
3826                 return kvm_arch_fault_in_page(vcpu, current->thread.gmap_addr, 1);
3827         }
3828         return vcpu_post_run_fault_in_sie(vcpu);
3829 }
3830
3831 static int __vcpu_run(struct kvm_vcpu *vcpu)
3832 {
3833         int rc, exit_reason;
3834
3835         /*
3836          * We try to hold kvm->srcu during most of vcpu_run (except when run-
3837          * ning the guest), so that memslots (and other stuff) are protected
3838          */
3839         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
3840
3841         do {
3842                 rc = vcpu_pre_run(vcpu);
3843                 if (rc)
3844                         break;
3845
3846                 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
3847                 /*
3848                  * As PF_VCPU will be used in fault handler, between
3849                  * guest_enter and guest_exit should be no uaccess.
3850                  */
3851                 local_irq_disable();
3852                 guest_enter_irqoff();
3853                 __disable_cpu_timer_accounting(vcpu);
3854                 local_irq_enable();
3855                 exit_reason = sie64a(vcpu->arch.sie_block,
3856                                      vcpu->run->s.regs.gprs);
3857                 local_irq_disable();
3858                 __enable_cpu_timer_accounting(vcpu);
3859                 guest_exit_irqoff();
3860                 local_irq_enable();
3861                 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
3862
3863                 rc = vcpu_post_run(vcpu, exit_reason);
3864         } while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc);
3865
3866         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
3867         return rc;
3868 }
3869
3870 static void sync_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3871 {
3872         struct runtime_instr_cb *riccb;
3873         struct gs_cb *gscb;
3874
3875         riccb = (struct runtime_instr_cb *) &kvm_run->s.regs.riccb;
3876         gscb = (struct gs_cb *) &kvm_run->s.regs.gscb;
3877         vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
3878         vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
3879         if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX)
3880                 kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
3881         if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) {
3882                 memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128);
3883                 /* some control register changes require a tlb flush */
3884                 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
3885         }
3886         if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
3887                 kvm_s390_set_cpu_timer(vcpu, kvm_run->s.regs.cputm);
3888                 vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc;
3889                 vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr;
3890                 vcpu->arch.sie_block->pp = kvm_run->s.regs.pp;
3891                 vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea;
3892         }
3893         if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) {
3894                 vcpu->arch.pfault_token = kvm_run->s.regs.pft;
3895                 vcpu->arch.pfault_select = kvm_run->s.regs.pfs;
3896                 vcpu->arch.pfault_compare = kvm_run->s.regs.pfc;
3897                 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
3898                         kvm_clear_async_pf_completion_queue(vcpu);
3899         }
3900         /*
3901          * If userspace sets the riccb (e.g. after migration) to a valid state,
3902          * we should enable RI here instead of doing the lazy enablement.
3903          */
3904         if ((kvm_run->kvm_dirty_regs & KVM_SYNC_RICCB) &&
3905             test_kvm_facility(vcpu->kvm, 64) &&
3906             riccb->v &&
3907             !(vcpu->arch.sie_block->ecb3 & ECB3_RI)) {
3908                 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (sync_regs)");
3909                 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
3910         }
3911         /*
3912          * If userspace sets the gscb (e.g. after migration) to non-zero,
3913          * we should enable GS here instead of doing the lazy enablement.
3914          */
3915         if ((kvm_run->kvm_dirty_regs & KVM_SYNC_GSCB) &&
3916             test_kvm_facility(vcpu->kvm, 133) &&
3917             gscb->gssm &&
3918             !vcpu->arch.gs_enabled) {
3919                 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (sync_regs)");
3920                 vcpu->arch.sie_block->ecb |= ECB_GS;
3921                 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
3922                 vcpu->arch.gs_enabled = 1;
3923         }
3924         if ((kvm_run->kvm_dirty_regs & KVM_SYNC_BPBC) &&
3925             test_kvm_facility(vcpu->kvm, 82)) {
3926                 vcpu->arch.sie_block->fpf &= ~FPF_BPBC;
3927                 vcpu->arch.sie_block->fpf |= kvm_run->s.regs.bpbc ? FPF_BPBC : 0;
3928         }
3929         save_access_regs(vcpu->arch.host_acrs);
3930         restore_access_regs(vcpu->run->s.regs.acrs);
3931         /* save host (userspace) fprs/vrs */
3932         save_fpu_regs();
3933         vcpu->arch.host_fpregs.fpc = current->thread.fpu.fpc;
3934         vcpu->arch.host_fpregs.regs = current->thread.fpu.regs;
3935         if (MACHINE_HAS_VX)
3936                 current->thread.fpu.regs = vcpu->run->s.regs.vrs;
3937         else
3938                 current->thread.fpu.regs = vcpu->run->s.regs.fprs;
3939         current->thread.fpu.fpc = vcpu->run->s.regs.fpc;
3940         if (test_fp_ctl(current->thread.fpu.fpc))
3941                 /* User space provided an invalid FPC, let's clear it */
3942                 current->thread.fpu.fpc = 0;
3943         if (MACHINE_HAS_GS) {
3944                 preempt_disable();
3945                 __ctl_set_bit(2, 4);
3946                 if (current->thread.gs_cb) {
3947                         vcpu->arch.host_gscb = current->thread.gs_cb;
3948                         save_gs_cb(vcpu->arch.host_gscb);
3949                 }
3950                 if (vcpu->arch.gs_enabled) {
3951                         current->thread.gs_cb = (struct gs_cb *)
3952                                                 &vcpu->run->s.regs.gscb;
3953                         restore_gs_cb(current->thread.gs_cb);
3954                 }
3955                 preempt_enable();
3956         }
3957         /* SIE will load etoken directly from SDNX and therefore kvm_run */
3958
3959         kvm_run->kvm_dirty_regs = 0;
3960 }
3961
3962 static void store_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3963 {
3964         kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask;
3965         kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr;
3966         kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu);
3967         memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128);
3968         kvm_run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu);
3969         kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc;
3970         kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr;
3971         kvm_run->s.regs.pp = vcpu->arch.sie_block->pp;
3972         kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea;
3973         kvm_run->s.regs.pft = vcpu->arch.pfault_token;
3974         kvm_run->s.regs.pfs = vcpu->arch.pfault_select;
3975         kvm_run->s.regs.pfc = vcpu->arch.pfault_compare;
3976         kvm_run->s.regs.bpbc = (vcpu->arch.sie_block->fpf & FPF_BPBC) == FPF_BPBC;
3977         save_access_regs(vcpu->run->s.regs.acrs);
3978         restore_access_regs(vcpu->arch.host_acrs);
3979         /* Save guest register state */
3980         save_fpu_regs();
3981         vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
3982         /* Restore will be done lazily at return */
3983         current->thread.fpu.fpc = vcpu->arch.host_fpregs.fpc;
3984         current->thread.fpu.regs = vcpu->arch.host_fpregs.regs;
3985         if (MACHINE_HAS_GS) {
3986                 __ctl_set_bit(2, 4);
3987                 if (vcpu->arch.gs_enabled)
3988                         save_gs_cb(current->thread.gs_cb);
3989                 preempt_disable();
3990                 current->thread.gs_cb = vcpu->arch.host_gscb;
3991                 restore_gs_cb(vcpu->arch.host_gscb);
3992                 preempt_enable();
3993                 if (!vcpu->arch.host_gscb)
3994                         __ctl_clear_bit(2, 4);
3995                 vcpu->arch.host_gscb = NULL;
3996         }
3997         /* SIE will save etoken directly into SDNX and therefore kvm_run */
3998 }
3999
4000 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
4001 {
4002         int rc;
4003
4004         if (kvm_run->immediate_exit)
4005                 return -EINTR;
4006
4007         if (kvm_run->kvm_valid_regs & ~KVM_SYNC_S390_VALID_FIELDS ||
4008             kvm_run->kvm_dirty_regs & ~KVM_SYNC_S390_VALID_FIELDS)
4009                 return -EINVAL;
4010
4011         vcpu_load(vcpu);
4012
4013         if (guestdbg_exit_pending(vcpu)) {
4014                 kvm_s390_prepare_debug_exit(vcpu);
4015                 rc = 0;
4016                 goto out;
4017         }
4018
4019         kvm_sigset_activate(vcpu);
4020
4021         if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) {
4022                 kvm_s390_vcpu_start(vcpu);
4023         } else if (is_vcpu_stopped(vcpu)) {
4024                 pr_err_ratelimited("can't run stopped vcpu %d\n",
4025                                    vcpu->vcpu_id);
4026                 rc = -EINVAL;
4027                 goto out;
4028         }
4029
4030         sync_regs(vcpu, kvm_run);
4031         enable_cpu_timer_accounting(vcpu);
4032
4033         might_fault();
4034         rc = __vcpu_run(vcpu);
4035
4036         if (signal_pending(current) && !rc) {
4037                 kvm_run->exit_reason = KVM_EXIT_INTR;
4038                 rc = -EINTR;
4039         }
4040
4041         if (guestdbg_exit_pending(vcpu) && !rc)  {
4042                 kvm_s390_prepare_debug_exit(vcpu);
4043                 rc = 0;
4044         }
4045
4046         if (rc == -EREMOTE) {
4047                 /* userspace support is needed, kvm_run has been prepared */
4048                 rc = 0;
4049         }
4050
4051         disable_cpu_timer_accounting(vcpu);
4052         store_regs(vcpu, kvm_run);
4053
4054         kvm_sigset_deactivate(vcpu);
4055
4056         vcpu->stat.exit_userspace++;
4057 out:
4058         vcpu_put(vcpu);
4059         return rc;
4060 }
4061
4062 /*
4063  * store status at address
4064  * we use have two special cases:
4065  * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit
4066  * KVM_S390_STORE_STATUS_PREFIXED: -> prefix
4067  */
4068 int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa)
4069 {
4070         unsigned char archmode = 1;
4071         freg_t fprs[NUM_FPRS];
4072         unsigned int px;
4073         u64 clkcomp, cputm;
4074         int rc;
4075
4076         px = kvm_s390_get_prefix(vcpu);
4077         if (gpa == KVM_S390_STORE_STATUS_NOADDR) {
4078                 if (write_guest_abs(vcpu, 163, &archmode, 1))
4079                         return -EFAULT;
4080                 gpa = 0;
4081         } else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) {
4082                 if (write_guest_real(vcpu, 163, &archmode, 1))
4083                         return -EFAULT;
4084                 gpa = px;
4085         } else
4086                 gpa -= __LC_FPREGS_SAVE_AREA;
4087
4088         /* manually convert vector registers if necessary */
4089         if (MACHINE_HAS_VX) {
4090                 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
4091                 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
4092                                      fprs, 128);
4093         } else {
4094                 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
4095                                      vcpu->run->s.regs.fprs, 128);
4096         }
4097         rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA,
4098                               vcpu->run->s.regs.gprs, 128);
4099         rc |= write_guest_abs(vcpu, gpa + __LC_PSW_SAVE_AREA,
4100                               &vcpu->arch.sie_block->gpsw, 16);
4101         rc |= write_guest_abs(vcpu, gpa + __LC_PREFIX_SAVE_AREA,
4102                               &px, 4);
4103         rc |= write_guest_abs(vcpu, gpa + __LC_FP_CREG_SAVE_AREA,
4104                               &vcpu->run->s.regs.fpc, 4);
4105         rc |= write_guest_abs(vcpu, gpa + __LC_TOD_PROGREG_SAVE_AREA,
4106                               &vcpu->arch.sie_block->todpr, 4);
4107         cputm = kvm_s390_get_cpu_timer(vcpu);
4108         rc |= write_guest_abs(vcpu, gpa + __LC_CPU_TIMER_SAVE_AREA,
4109                               &cputm, 8);
4110         clkcomp = vcpu->arch.sie_block->ckc >> 8;
4111         rc |= write_guest_abs(vcpu, gpa + __LC_CLOCK_COMP_SAVE_AREA,
4112                               &clkcomp, 8);
4113         rc |= write_guest_abs(vcpu, gpa + __LC_AREGS_SAVE_AREA,
4114                               &vcpu->run->s.regs.acrs, 64);
4115         rc |= write_guest_abs(vcpu, gpa + __LC_CREGS_SAVE_AREA,
4116                               &vcpu->arch.sie_block->gcr, 128);
4117         return rc ? -EFAULT : 0;
4118 }
4119
4120 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
4121 {
4122         /*
4123          * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy
4124          * switch in the run ioctl. Let's update our copies before we save
4125          * it into the save area
4126          */
4127         save_fpu_regs();
4128         vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
4129         save_access_regs(vcpu->run->s.regs.acrs);
4130
4131         return kvm_s390_store_status_unloaded(vcpu, addr);
4132 }
4133
4134 static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
4135 {
4136         kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu);
4137         kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu);
4138 }
4139
4140 static void __disable_ibs_on_all_vcpus(struct kvm *kvm)
4141 {
4142         unsigned int i;
4143         struct kvm_vcpu *vcpu;
4144
4145         kvm_for_each_vcpu(i, vcpu, kvm) {
4146                 __disable_ibs_on_vcpu(vcpu);
4147         }
4148 }
4149
4150 static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
4151 {
4152         if (!sclp.has_ibs)
4153                 return;
4154         kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu);
4155         kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu);
4156 }
4157
4158 void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu)
4159 {
4160         int i, online_vcpus, started_vcpus = 0;
4161
4162         if (!is_vcpu_stopped(vcpu))
4163                 return;
4164
4165         trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1);
4166         /* Only one cpu at a time may enter/leave the STOPPED state. */
4167         spin_lock(&vcpu->kvm->arch.start_stop_lock);
4168         online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
4169
4170         for (i = 0; i < online_vcpus; i++) {
4171                 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i]))
4172                         started_vcpus++;
4173         }
4174
4175         if (started_vcpus == 0) {
4176                 /* we're the only active VCPU -> speed it up */
4177                 __enable_ibs_on_vcpu(vcpu);
4178         } else if (started_vcpus == 1) {
4179                 /*
4180                  * As we are starting a second VCPU, we have to disable
4181                  * the IBS facility on all VCPUs to remove potentially
4182                  * oustanding ENABLE requests.
4183                  */
4184                 __disable_ibs_on_all_vcpus(vcpu->kvm);
4185         }
4186
4187         kvm_s390_clear_cpuflags(vcpu, CPUSTAT_STOPPED);
4188         /*
4189          * Another VCPU might have used IBS while we were offline.
4190          * Let's play safe and flush the VCPU at startup.
4191          */
4192         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
4193         spin_unlock(&vcpu->kvm->arch.start_stop_lock);
4194         return;
4195 }
4196
4197 void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu)
4198 {
4199         int i, online_vcpus, started_vcpus = 0;
4200         struct kvm_vcpu *started_vcpu = NULL;
4201
4202         if (is_vcpu_stopped(vcpu))
4203                 return;
4204
4205         trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0);
4206         /* Only one cpu at a time may enter/leave the STOPPED state. */
4207         spin_lock(&vcpu->kvm->arch.start_stop_lock);
4208         online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
4209
4210         /* SIGP STOP and SIGP STOP AND STORE STATUS has been fully processed */
4211         kvm_s390_clear_stop_irq(vcpu);
4212
4213         kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOPPED);
4214         __disable_ibs_on_vcpu(vcpu);
4215
4216         for (i = 0; i < online_vcpus; i++) {
4217                 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i])) {
4218                         started_vcpus++;
4219                         started_vcpu = vcpu->kvm->vcpus[i];
4220                 }
4221         }
4222
4223         if (started_vcpus == 1) {
4224                 /*
4225                  * As we only have one VCPU left, we want to enable the
4226                  * IBS facility for that VCPU to speed it up.
4227                  */
4228                 __enable_ibs_on_vcpu(started_vcpu);
4229         }
4230
4231         spin_unlock(&vcpu->kvm->arch.start_stop_lock);
4232         return;
4233 }
4234
4235 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
4236                                      struct kvm_enable_cap *cap)
4237 {
4238         int r;
4239
4240         if (cap->flags)
4241                 return -EINVAL;
4242
4243         switch (cap->cap) {
4244         case KVM_CAP_S390_CSS_SUPPORT:
4245                 if (!vcpu->kvm->arch.css_support) {
4246                         vcpu->kvm->arch.css_support = 1;
4247                         VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support");
4248                         trace_kvm_s390_enable_css(vcpu->kvm);
4249                 }
4250                 r = 0;
4251                 break;
4252         default:
4253                 r = -EINVAL;
4254                 break;
4255         }
4256         return r;
4257 }
4258
4259 static long kvm_s390_guest_mem_op(struct kvm_vcpu *vcpu,
4260                                   struct kvm_s390_mem_op *mop)
4261 {
4262         void __user *uaddr = (void __user *)mop->buf;
4263         void *tmpbuf = NULL;
4264         int r, srcu_idx;
4265         const u64 supported_flags = KVM_S390_MEMOP_F_INJECT_EXCEPTION
4266                                     | KVM_S390_MEMOP_F_CHECK_ONLY;
4267
4268         if (mop->flags & ~supported_flags || mop->ar >= NUM_ACRS || !mop->size)
4269                 return -EINVAL;
4270
4271         if (mop->size > MEM_OP_MAX_SIZE)
4272                 return -E2BIG;
4273
4274         if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) {
4275                 tmpbuf = vmalloc(mop->size);
4276                 if (!tmpbuf)
4277                         return -ENOMEM;
4278         }
4279
4280         srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
4281
4282         switch (mop->op) {
4283         case KVM_S390_MEMOP_LOGICAL_READ:
4284                 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
4285                         r = check_gva_range(vcpu, mop->gaddr, mop->ar,
4286                                             mop->size, GACC_FETCH);
4287                         break;
4288                 }
4289                 r = read_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size);
4290                 if (r == 0) {
4291                         if (copy_to_user(uaddr, tmpbuf, mop->size))
4292                                 r = -EFAULT;
4293                 }
4294                 break;
4295         case KVM_S390_MEMOP_LOGICAL_WRITE:
4296                 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
4297                         r = check_gva_range(vcpu, mop->gaddr, mop->ar,
4298                                             mop->size, GACC_STORE);
4299                         break;
4300                 }
4301                 if (copy_from_user(tmpbuf, uaddr, mop->size)) {
4302                         r = -EFAULT;
4303                         break;
4304                 }
4305                 r = write_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size);
4306                 break;
4307         default:
4308                 r = -EINVAL;
4309         }
4310
4311         srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
4312
4313         if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0)
4314                 kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
4315
4316         vfree(tmpbuf);
4317         return r;
4318 }
4319
4320 long kvm_arch_vcpu_async_ioctl(struct file *filp,
4321                                unsigned int ioctl, unsigned long arg)
4322 {
4323         struct kvm_vcpu *vcpu = filp->private_data;
4324         void __user *argp = (void __user *)arg;
4325
4326         switch (ioctl) {
4327         case KVM_S390_IRQ: {
4328                 struct kvm_s390_irq s390irq;
4329
4330                 if (copy_from_user(&s390irq, argp, sizeof(s390irq)))
4331                         return -EFAULT;
4332                 return kvm_s390_inject_vcpu(vcpu, &s390irq);
4333         }
4334         case KVM_S390_INTERRUPT: {
4335                 struct kvm_s390_interrupt s390int;
4336                 struct kvm_s390_irq s390irq = {};
4337
4338                 if (copy_from_user(&s390int, argp, sizeof(s390int)))
4339                         return -EFAULT;
4340                 if (s390int_to_s390irq(&s390int, &s390irq))
4341                         return -EINVAL;
4342                 return kvm_s390_inject_vcpu(vcpu, &s390irq);
4343         }
4344         }
4345         return -ENOIOCTLCMD;
4346 }
4347
4348 long kvm_arch_vcpu_ioctl(struct file *filp,
4349                          unsigned int ioctl, unsigned long arg)
4350 {
4351         struct kvm_vcpu *vcpu = filp->private_data;
4352         void __user *argp = (void __user *)arg;
4353         int idx;
4354         long r;
4355
4356         vcpu_load(vcpu);
4357
4358         switch (ioctl) {
4359         case KVM_S390_STORE_STATUS:
4360                 idx = srcu_read_lock(&vcpu->kvm->srcu);
4361                 r = kvm_s390_store_status_unloaded(vcpu, arg);
4362                 srcu_read_unlock(&vcpu->kvm->srcu, idx);
4363                 break;
4364         case KVM_S390_SET_INITIAL_PSW: {
4365                 psw_t psw;
4366
4367                 r = -EFAULT;
4368                 if (copy_from_user(&psw, argp, sizeof(psw)))
4369                         break;
4370                 r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
4371                 break;
4372         }
4373         case KVM_S390_CLEAR_RESET:
4374                 r = 0;
4375                 kvm_arch_vcpu_ioctl_clear_reset(vcpu);
4376                 break;
4377         case KVM_S390_INITIAL_RESET:
4378                 r = 0;
4379                 kvm_arch_vcpu_ioctl_initial_reset(vcpu);
4380                 break;
4381         case KVM_S390_NORMAL_RESET:
4382                 r = 0;
4383                 kvm_arch_vcpu_ioctl_normal_reset(vcpu);
4384                 break;
4385         case KVM_SET_ONE_REG:
4386         case KVM_GET_ONE_REG: {
4387                 struct kvm_one_reg reg;
4388                 r = -EFAULT;
4389                 if (copy_from_user(&reg, argp, sizeof(reg)))
4390                         break;
4391                 if (ioctl == KVM_SET_ONE_REG)
4392                         r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, &reg);
4393                 else
4394                         r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, &reg);
4395                 break;
4396         }
4397 #ifdef CONFIG_KVM_S390_UCONTROL
4398         case KVM_S390_UCAS_MAP: {
4399                 struct kvm_s390_ucas_mapping ucasmap;
4400
4401                 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
4402                         r = -EFAULT;
4403                         break;
4404                 }
4405
4406                 if (!kvm_is_ucontrol(vcpu->kvm)) {
4407                         r = -EINVAL;
4408                         break;
4409                 }
4410
4411                 r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr,
4412                                      ucasmap.vcpu_addr, ucasmap.length);
4413                 break;
4414         }
4415         case KVM_S390_UCAS_UNMAP: {
4416                 struct kvm_s390_ucas_mapping ucasmap;
4417
4418                 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
4419                         r = -EFAULT;
4420                         break;
4421                 }
4422
4423                 if (!kvm_is_ucontrol(vcpu->kvm)) {
4424                         r = -EINVAL;
4425                         break;
4426                 }
4427
4428                 r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr,
4429                         ucasmap.length);
4430                 break;
4431         }
4432 #endif
4433         case KVM_S390_VCPU_FAULT: {
4434                 r = gmap_fault(vcpu->arch.gmap, arg, 0);
4435                 break;
4436         }
4437         case KVM_ENABLE_CAP:
4438         {
4439                 struct kvm_enable_cap cap;
4440                 r = -EFAULT;
4441                 if (copy_from_user(&cap, argp, sizeof(cap)))
4442                         break;
4443                 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
4444                 break;
4445         }
4446         case KVM_S390_MEM_OP: {
4447                 struct kvm_s390_mem_op mem_op;
4448
4449                 if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0)
4450                         r = kvm_s390_guest_mem_op(vcpu, &mem_op);
4451                 else
4452                         r = -EFAULT;
4453                 break;
4454         }
4455         case KVM_S390_SET_IRQ_STATE: {
4456                 struct kvm_s390_irq_state irq_state;
4457
4458                 r = -EFAULT;
4459                 if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
4460                         break;
4461                 if (irq_state.len > VCPU_IRQS_MAX_BUF ||
4462                     irq_state.len == 0 ||
4463                     irq_state.len % sizeof(struct kvm_s390_irq) > 0) {
4464                         r = -EINVAL;
4465                         break;
4466                 }
4467                 /* do not use irq_state.flags, it will break old QEMUs */
4468                 r = kvm_s390_set_irq_state(vcpu,
4469                                            (void __user *) irq_state.buf,
4470                                            irq_state.len);
4471                 break;
4472         }
4473         case KVM_S390_GET_IRQ_STATE: {
4474                 struct kvm_s390_irq_state irq_state;
4475
4476                 r = -EFAULT;
4477                 if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
4478                         break;
4479                 if (irq_state.len == 0) {
4480                         r = -EINVAL;
4481                         break;
4482                 }
4483                 /* do not use irq_state.flags, it will break old QEMUs */
4484                 r = kvm_s390_get_irq_state(vcpu,
4485                                            (__u8 __user *)  irq_state.buf,
4486                                            irq_state.len);
4487                 break;
4488         }
4489         default:
4490                 r = -ENOTTY;
4491         }
4492
4493         vcpu_put(vcpu);
4494         return r;
4495 }
4496
4497 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
4498 {
4499 #ifdef CONFIG_KVM_S390_UCONTROL
4500         if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET)
4501                  && (kvm_is_ucontrol(vcpu->kvm))) {
4502                 vmf->page = virt_to_page(vcpu->arch.sie_block);
4503                 get_page(vmf->page);
4504                 return 0;
4505         }
4506 #endif
4507         return VM_FAULT_SIGBUS;
4508 }
4509
4510 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
4511                             unsigned long npages)
4512 {
4513         return 0;
4514 }
4515
4516 /* Section: memory related */
4517 int kvm_arch_prepare_memory_region(struct kvm *kvm,
4518                                    struct kvm_memory_slot *memslot,
4519                                    const struct kvm_userspace_memory_region *mem,
4520                                    enum kvm_mr_change change)
4521 {
4522         /* A few sanity checks. We can have memory slots which have to be
4523            located/ended at a segment boundary (1MB). The memory in userland is
4524            ok to be fragmented into various different vmas. It is okay to mmap()
4525            and munmap() stuff in this slot after doing this call at any time */
4526
4527         if (mem->userspace_addr & 0xffffful)
4528                 return -EINVAL;
4529
4530         if (mem->memory_size & 0xffffful)
4531                 return -EINVAL;
4532
4533         if (mem->guest_phys_addr + mem->memory_size > kvm->arch.mem_limit)
4534                 return -EINVAL;
4535
4536         return 0;
4537 }
4538
4539 void kvm_arch_commit_memory_region(struct kvm *kvm,
4540                                 const struct kvm_userspace_memory_region *mem,
4541                                 const struct kvm_memory_slot *old,
4542                                 const struct kvm_memory_slot *new,
4543                                 enum kvm_mr_change change)
4544 {
4545         int rc = 0;
4546
4547         switch (change) {
4548         case KVM_MR_DELETE:
4549                 rc = gmap_unmap_segment(kvm->arch.gmap, old->base_gfn * PAGE_SIZE,
4550                                         old->npages * PAGE_SIZE);
4551                 break;
4552         case KVM_MR_MOVE:
4553                 rc = gmap_unmap_segment(kvm->arch.gmap, old->base_gfn * PAGE_SIZE,
4554                                         old->npages * PAGE_SIZE);
4555                 if (rc)
4556                         break;
4557                 /* FALLTHROUGH */
4558         case KVM_MR_CREATE:
4559                 rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr,
4560                                       mem->guest_phys_addr, mem->memory_size);
4561                 break;
4562         case KVM_MR_FLAGS_ONLY:
4563                 break;
4564         default:
4565                 WARN(1, "Unknown KVM MR CHANGE: %d\n", change);
4566         }
4567         if (rc)
4568                 pr_warn("failed to commit memory region\n");
4569         return;
4570 }
4571
4572 static inline unsigned long nonhyp_mask(int i)
4573 {
4574         unsigned int nonhyp_fai = (sclp.hmfai << i * 2) >> 30;
4575
4576         return 0x0000ffffffffffffUL >> (nonhyp_fai << 4);
4577 }
4578
4579 void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu)
4580 {
4581         vcpu->valid_wakeup = false;
4582 }
4583
4584 static int __init kvm_s390_init(void)
4585 {
4586         int i;
4587
4588         if (!sclp.has_sief2) {
4589                 pr_info("SIE is not available\n");
4590                 return -ENODEV;
4591         }
4592
4593         if (nested && hpage) {
4594                 pr_info("A KVM host that supports nesting cannot back its KVM guests with huge pages\n");
4595                 return -EINVAL;
4596         }
4597
4598         for (i = 0; i < 16; i++)
4599                 kvm_s390_fac_base[i] |=
4600                         S390_lowcore.stfle_fac_list[i] & nonhyp_mask(i);
4601
4602         return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
4603 }
4604
4605 static void __exit kvm_s390_exit(void)
4606 {
4607         kvm_exit();
4608 }
4609
4610 module_init(kvm_s390_init);
4611 module_exit(kvm_s390_exit);
4612
4613 /*
4614  * Enable autoloading of the kvm module.
4615  * Note that we add the module alias here instead of virt/kvm/kvm_main.c
4616  * since x86 takes a different approach.
4617  */
4618 #include <linux/miscdevice.h>
4619 MODULE_ALIAS_MISCDEV(KVM_MINOR);
4620 MODULE_ALIAS("devname:kvm");