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, 2020
   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 #include <linux/pgtable.h>
  35
  36 #include <asm/asm-offsets.h>
  37 #include <asm/lowcore.h>
  38 #include <asm/stp.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 <asm/uv.h>
  48 #include <asm/fpu/api.h>
  49 #include "kvm-s390.h"
  50 #include "gaccess.h"
  51
  52 #define CREATE_TRACE_POINTS
  53 #include "trace.h"
  54 #include "trace-s390.h"
  55
  56 #define MEM_OP_MAX_SIZE 65536   /* Maximum transfer size for KVM_S390_MEM_OP */
  57 #define LOCAL_IRQS 32
  58 #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
  59                            (KVM_MAX_VCPUS + LOCAL_IRQS))
  60
  61 const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
  62         KVM_GENERIC_VM_STATS(),
  63         STATS_DESC_COUNTER(VM, inject_io),
  64         STATS_DESC_COUNTER(VM, inject_float_mchk),
  65         STATS_DESC_COUNTER(VM, inject_pfault_done),
  66         STATS_DESC_COUNTER(VM, inject_service_signal),
  67         STATS_DESC_COUNTER(VM, inject_virtio)
  68 };
  69 static_assert(ARRAY_SIZE(kvm_vm_stats_desc) ==
  70                 sizeof(struct kvm_vm_stat) / sizeof(u64));
  71
  72 const struct kvm_stats_header kvm_vm_stats_header = {
  73         .name_size = KVM_STATS_NAME_SIZE,
  74         .num_desc = ARRAY_SIZE(kvm_vm_stats_desc),
  75         .id_offset = sizeof(struct kvm_stats_header),
  76         .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
  77         .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
  78                        sizeof(kvm_vm_stats_desc),
  79 };
  80
  81 const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
  82         KVM_GENERIC_VCPU_STATS(),
  83         STATS_DESC_COUNTER(VCPU, exit_userspace),
  84         STATS_DESC_COUNTER(VCPU, exit_null),
  85         STATS_DESC_COUNTER(VCPU, exit_external_request),
  86         STATS_DESC_COUNTER(VCPU, exit_io_request),
  87         STATS_DESC_COUNTER(VCPU, exit_external_interrupt),
  88         STATS_DESC_COUNTER(VCPU, exit_stop_request),
  89         STATS_DESC_COUNTER(VCPU, exit_validity),
  90         STATS_DESC_COUNTER(VCPU, exit_instruction),
  91         STATS_DESC_COUNTER(VCPU, exit_pei),
  92         STATS_DESC_COUNTER(VCPU, halt_no_poll_steal),
  93         STATS_DESC_COUNTER(VCPU, instruction_lctl),
  94         STATS_DESC_COUNTER(VCPU, instruction_lctlg),
  95         STATS_DESC_COUNTER(VCPU, instruction_stctl),
  96         STATS_DESC_COUNTER(VCPU, instruction_stctg),
  97         STATS_DESC_COUNTER(VCPU, exit_program_interruption),
  98         STATS_DESC_COUNTER(VCPU, exit_instr_and_program),
  99         STATS_DESC_COUNTER(VCPU, exit_operation_exception),
 100         STATS_DESC_COUNTER(VCPU, deliver_ckc),
 101         STATS_DESC_COUNTER(VCPU, deliver_cputm),
 102         STATS_DESC_COUNTER(VCPU, deliver_external_call),
 103         STATS_DESC_COUNTER(VCPU, deliver_emergency_signal),
 104         STATS_DESC_COUNTER(VCPU, deliver_service_signal),
 105         STATS_DESC_COUNTER(VCPU, deliver_virtio),
 106         STATS_DESC_COUNTER(VCPU, deliver_stop_signal),
 107         STATS_DESC_COUNTER(VCPU, deliver_prefix_signal),
 108         STATS_DESC_COUNTER(VCPU, deliver_restart_signal),
 109         STATS_DESC_COUNTER(VCPU, deliver_program),
 110         STATS_DESC_COUNTER(VCPU, deliver_io),
 111         STATS_DESC_COUNTER(VCPU, deliver_machine_check),
 112         STATS_DESC_COUNTER(VCPU, exit_wait_state),
 113         STATS_DESC_COUNTER(VCPU, inject_ckc),
 114         STATS_DESC_COUNTER(VCPU, inject_cputm),
 115         STATS_DESC_COUNTER(VCPU, inject_external_call),
 116         STATS_DESC_COUNTER(VCPU, inject_emergency_signal),
 117         STATS_DESC_COUNTER(VCPU, inject_mchk),
 118         STATS_DESC_COUNTER(VCPU, inject_pfault_init),
 119         STATS_DESC_COUNTER(VCPU, inject_program),
 120         STATS_DESC_COUNTER(VCPU, inject_restart),
 121         STATS_DESC_COUNTER(VCPU, inject_set_prefix),
 122         STATS_DESC_COUNTER(VCPU, inject_stop_signal),
 123         STATS_DESC_COUNTER(VCPU, instruction_epsw),
 124         STATS_DESC_COUNTER(VCPU, instruction_gs),
 125         STATS_DESC_COUNTER(VCPU, instruction_io_other),
 126         STATS_DESC_COUNTER(VCPU, instruction_lpsw),
 127         STATS_DESC_COUNTER(VCPU, instruction_lpswe),
 128         STATS_DESC_COUNTER(VCPU, instruction_pfmf),
 129         STATS_DESC_COUNTER(VCPU, instruction_ptff),
 130         STATS_DESC_COUNTER(VCPU, instruction_sck),
 131         STATS_DESC_COUNTER(VCPU, instruction_sckpf),
 132         STATS_DESC_COUNTER(VCPU, instruction_stidp),
 133         STATS_DESC_COUNTER(VCPU, instruction_spx),
 134         STATS_DESC_COUNTER(VCPU, instruction_stpx),
 135         STATS_DESC_COUNTER(VCPU, instruction_stap),
 136         STATS_DESC_COUNTER(VCPU, instruction_iske),
 137         STATS_DESC_COUNTER(VCPU, instruction_ri),
 138         STATS_DESC_COUNTER(VCPU, instruction_rrbe),
 139         STATS_DESC_COUNTER(VCPU, instruction_sske),
 140         STATS_DESC_COUNTER(VCPU, instruction_ipte_interlock),
 141         STATS_DESC_COUNTER(VCPU, instruction_stsi),
 142         STATS_DESC_COUNTER(VCPU, instruction_stfl),
 143         STATS_DESC_COUNTER(VCPU, instruction_tb),
 144         STATS_DESC_COUNTER(VCPU, instruction_tpi),
 145         STATS_DESC_COUNTER(VCPU, instruction_tprot),
 146         STATS_DESC_COUNTER(VCPU, instruction_tsch),
 147         STATS_DESC_COUNTER(VCPU, instruction_sie),
 148         STATS_DESC_COUNTER(VCPU, instruction_essa),
 149         STATS_DESC_COUNTER(VCPU, instruction_sthyi),
 150         STATS_DESC_COUNTER(VCPU, instruction_sigp_sense),
 151         STATS_DESC_COUNTER(VCPU, instruction_sigp_sense_running),
 152         STATS_DESC_COUNTER(VCPU, instruction_sigp_external_call),
 153         STATS_DESC_COUNTER(VCPU, instruction_sigp_emergency),
 154         STATS_DESC_COUNTER(VCPU, instruction_sigp_cond_emergency),
 155         STATS_DESC_COUNTER(VCPU, instruction_sigp_start),
 156         STATS_DESC_COUNTER(VCPU, instruction_sigp_stop),
 157         STATS_DESC_COUNTER(VCPU, instruction_sigp_stop_store_status),
 158         STATS_DESC_COUNTER(VCPU, instruction_sigp_store_status),
 159         STATS_DESC_COUNTER(VCPU, instruction_sigp_store_adtl_status),
 160         STATS_DESC_COUNTER(VCPU, instruction_sigp_arch),
 161         STATS_DESC_COUNTER(VCPU, instruction_sigp_prefix),
 162         STATS_DESC_COUNTER(VCPU, instruction_sigp_restart),
 163         STATS_DESC_COUNTER(VCPU, instruction_sigp_init_cpu_reset),
 164         STATS_DESC_COUNTER(VCPU, instruction_sigp_cpu_reset),
 165         STATS_DESC_COUNTER(VCPU, instruction_sigp_unknown),
 166         STATS_DESC_COUNTER(VCPU, instruction_diagnose_10),
 167         STATS_DESC_COUNTER(VCPU, instruction_diagnose_44),
 168         STATS_DESC_COUNTER(VCPU, instruction_diagnose_9c),
 169         STATS_DESC_COUNTER(VCPU, diag_9c_ignored),
 170         STATS_DESC_COUNTER(VCPU, diag_9c_forward),
 171         STATS_DESC_COUNTER(VCPU, instruction_diagnose_258),
 172         STATS_DESC_COUNTER(VCPU, instruction_diagnose_308),
 173         STATS_DESC_COUNTER(VCPU, instruction_diagnose_500),
 174         STATS_DESC_COUNTER(VCPU, instruction_diagnose_other),
 175         STATS_DESC_COUNTER(VCPU, pfault_sync)
 176 };
 177 static_assert(ARRAY_SIZE(kvm_vcpu_stats_desc) ==
 178                 sizeof(struct kvm_vcpu_stat) / sizeof(u64));
 179
 180 const struct kvm_stats_header kvm_vcpu_stats_header = {
 181         .name_size = KVM_STATS_NAME_SIZE,
 182         .num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc),
 183         .id_offset = sizeof(struct kvm_stats_header),
 184         .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
 185         .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
 186                        sizeof(kvm_vcpu_stats_desc),
 187 };
 188
 189 /* allow nested virtualization in KVM (if enabled by user space) */
 190 static int nested;
 191 module_param(nested, int, S_IRUGO);
 192 MODULE_PARM_DESC(nested, "Nested virtualization support");
 193
 194 /* allow 1m huge page guest backing, if !nested */
 195 static int hpage;
 196 module_param(hpage, int, 0444);
 197 MODULE_PARM_DESC(hpage, "1m huge page backing support");
 198
 199 /* maximum percentage of steal time for polling.  >100 is treated like 100 */
 200 static u8 halt_poll_max_steal = 10;
 201 module_param(halt_poll_max_steal, byte, 0644);
 202 MODULE_PARM_DESC(halt_poll_max_steal, "Maximum percentage of steal time to allow polling");
 203
 204 /* if set to true, the GISA will be initialized and used if available */
 205 static bool use_gisa  = true;
 206 module_param(use_gisa, bool, 0644);
 207 MODULE_PARM_DESC(use_gisa, "Use the GISA if the host supports it.");
 208
 209 /* maximum diag9c forwarding per second */
 210 unsigned int diag9c_forwarding_hz;
 211 module_param(diag9c_forwarding_hz, uint, 0644);
 212 MODULE_PARM_DESC(diag9c_forwarding_hz, "Maximum diag9c forwarding per second, 0 to turn off");
 213
 214 /*
 215  * For now we handle at most 16 double words as this is what the s390 base
 216  * kernel handles and stores in the prefix page. If we ever need to go beyond
 217  * this, this requires changes to code, but the external uapi can stay.
 218  */
 219 #define SIZE_INTERNAL 16
 220
 221 /*
 222  * Base feature mask that defines default mask for facilities. Consists of the
 223  * defines in FACILITIES_KVM and the non-hypervisor managed bits.
 224  */
 225 static unsigned long kvm_s390_fac_base[SIZE_INTERNAL] = { FACILITIES_KVM };
 226 /*
 227  * Extended feature mask. Consists of the defines in FACILITIES_KVM_CPUMODEL
 228  * and defines the facilities that can be enabled via a cpu model.
 229  */
 230 static unsigned long kvm_s390_fac_ext[SIZE_INTERNAL] = { FACILITIES_KVM_CPUMODEL };
 231
 232 static unsigned long kvm_s390_fac_size(void)
 233 {
 234         BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_MASK_SIZE_U64);
 235         BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_LIST_SIZE_U64);
 236         BUILD_BUG_ON(SIZE_INTERNAL * sizeof(unsigned long) >
 237                 sizeof(stfle_fac_list));
 238
 239         return SIZE_INTERNAL;
 240 }
 241
 242 /* available cpu features supported by kvm */
 243 static DECLARE_BITMAP(kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
 244 /* available subfunctions indicated via query / "test bit" */
 245 static struct kvm_s390_vm_cpu_subfunc kvm_s390_available_subfunc;
 246
 247 static struct gmap_notifier gmap_notifier;
 248 static struct gmap_notifier vsie_gmap_notifier;
 249 debug_info_t *kvm_s390_dbf;
 250 debug_info_t *kvm_s390_dbf_uv;
 251
 252 /* Section: not file related */
 253 int kvm_arch_hardware_enable(void)
 254 {
 255         /* every s390 is virtualization enabled ;-) */
 256         return 0;
 257 }
 258
 259 int kvm_arch_check_processor_compat(void *opaque)
 260 {
 261         return 0;
 262 }
 263
 264 /* forward declarations */
 265 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
 266                               unsigned long end);
 267 static int sca_switch_to_extended(struct kvm *kvm);
 268
 269 static void kvm_clock_sync_scb(struct kvm_s390_sie_block *scb, u64 delta)
 270 {
 271         u8 delta_idx = 0;
 272
 273         /*
 274          * The TOD jumps by delta, we have to compensate this by adding
 275          * -delta to the epoch.
 276          */
 277         delta = -delta;
 278
 279         /* sign-extension - we're adding to signed values below */
 280         if ((s64)delta < 0)
 281                 delta_idx = -1;
 282
 283         scb->epoch += delta;
 284         if (scb->ecd & ECD_MEF) {
 285                 scb->epdx += delta_idx;
 286                 if (scb->epoch < delta)
 287                         scb->epdx += 1;
 288         }
 289 }
 290
 291 /*
 292  * This callback is executed during stop_machine(). All CPUs are therefore
 293  * temporarily stopped. In order not to change guest behavior, we have to
 294  * disable preemption whenever we touch the epoch of kvm and the VCPUs,
 295  * so a CPU won't be stopped while calculating with the epoch.
 296  */
 297 static int kvm_clock_sync(struct notifier_block *notifier, unsigned long val,
 298                           void *v)
 299 {
 300         struct kvm *kvm;
 301         struct kvm_vcpu *vcpu;
 302         int i;
 303         unsigned long long *delta = v;
 304
 305         list_for_each_entry(kvm, &vm_list, vm_list) {
 306                 kvm_for_each_vcpu(i, vcpu, kvm) {
 307                         kvm_clock_sync_scb(vcpu->arch.sie_block, *delta);
 308                         if (i == 0) {
 309                                 kvm->arch.epoch = vcpu->arch.sie_block->epoch;
 310                                 kvm->arch.epdx = vcpu->arch.sie_block->epdx;
 311                         }
 312                         if (vcpu->arch.cputm_enabled)
 313                                 vcpu->arch.cputm_start += *delta;
 314                         if (vcpu->arch.vsie_block)
 315                                 kvm_clock_sync_scb(vcpu->arch.vsie_block,
 316                                                    *delta);
 317                 }
 318         }
 319         return NOTIFY_OK;
 320 }
 321
 322 static struct notifier_block kvm_clock_notifier = {
 323         .notifier_call = kvm_clock_sync,
 324 };
 325
 326 int kvm_arch_hardware_setup(void *opaque)
 327 {
 328         gmap_notifier.notifier_call = kvm_gmap_notifier;
 329         gmap_register_pte_notifier(&gmap_notifier);
 330         vsie_gmap_notifier.notifier_call = kvm_s390_vsie_gmap_notifier;
 331         gmap_register_pte_notifier(&vsie_gmap_notifier);
 332         atomic_notifier_chain_register(&s390_epoch_delta_notifier,
 333                                        &kvm_clock_notifier);
 334         return 0;
 335 }
 336
 337 void kvm_arch_hardware_unsetup(void)
 338 {
 339         gmap_unregister_pte_notifier(&gmap_notifier);
 340         gmap_unregister_pte_notifier(&vsie_gmap_notifier);
 341         atomic_notifier_chain_unregister(&s390_epoch_delta_notifier,
 342                                          &kvm_clock_notifier);
 343 }
 344
 345 static void allow_cpu_feat(unsigned long nr)
 346 {
 347         set_bit_inv(nr, kvm_s390_available_cpu_feat);
 348 }
 349
 350 static inline int plo_test_bit(unsigned char nr)
 351 {
 352         unsigned long function = (unsigned long)nr | 0x100;
 353         int cc;
 354
 355         asm volatile(
 356                 "       lgr     0,%[function]\n"
 357                 /* Parameter registers are ignored for "test bit" */
 358                 "       plo     0,0,0,0(0)\n"
 359                 "       ipm     %0\n"
 360                 "       srl     %0,28\n"
 361                 : "=d" (cc)
 362                 : [function] "d" (function)
 363                 : "cc", "0");
 364         return cc == 0;
 365 }
 366
 367 static __always_inline void __insn32_query(unsigned int opcode, u8 *query)
 368 {
 369         asm volatile(
 370                 "       lghi    0,0\n"
 371                 "       lgr     1,%[query]\n"
 372                 /* Parameter registers are ignored */
 373                 "       .insn   rrf,%[opc] << 16,2,4,6,0\n"
 374                 :
 375                 : [query] "d" ((unsigned long)query), [opc] "i" (opcode)
 376                 : "cc", "memory", "0", "1");
 377 }
 378
 379 #define INSN_SORTL 0xb938
 380 #define INSN_DFLTCC 0xb939
 381
 382 static void kvm_s390_cpu_feat_init(void)
 383 {
 384         int i;
 385
 386         for (i = 0; i < 256; ++i) {
 387                 if (plo_test_bit(i))
 388                         kvm_s390_available_subfunc.plo[i >> 3] |= 0x80 >> (i & 7);
 389         }
 390
 391         if (test_facility(28)) /* TOD-clock steering */
 392                 ptff(kvm_s390_available_subfunc.ptff,
 393                      sizeof(kvm_s390_available_subfunc.ptff),
 394                      PTFF_QAF);
 395
 396         if (test_facility(17)) { /* MSA */
 397                 __cpacf_query(CPACF_KMAC, (cpacf_mask_t *)
 398                               kvm_s390_available_subfunc.kmac);
 399                 __cpacf_query(CPACF_KMC, (cpacf_mask_t *)
 400                               kvm_s390_available_subfunc.kmc);
 401                 __cpacf_query(CPACF_KM, (cpacf_mask_t *)
 402                               kvm_s390_available_subfunc.km);
 403                 __cpacf_query(CPACF_KIMD, (cpacf_mask_t *)
 404                               kvm_s390_available_subfunc.kimd);
 405                 __cpacf_query(CPACF_KLMD, (cpacf_mask_t *)
 406                               kvm_s390_available_subfunc.klmd);
 407         }
 408         if (test_facility(76)) /* MSA3 */
 409                 __cpacf_query(CPACF_PCKMO, (cpacf_mask_t *)
 410                               kvm_s390_available_subfunc.pckmo);
 411         if (test_facility(77)) { /* MSA4 */
 412                 __cpacf_query(CPACF_KMCTR, (cpacf_mask_t *)
 413                               kvm_s390_available_subfunc.kmctr);
 414                 __cpacf_query(CPACF_KMF, (cpacf_mask_t *)
 415                               kvm_s390_available_subfunc.kmf);
 416                 __cpacf_query(CPACF_KMO, (cpacf_mask_t *)
 417                               kvm_s390_available_subfunc.kmo);
 418                 __cpacf_query(CPACF_PCC, (cpacf_mask_t *)
 419                               kvm_s390_available_subfunc.pcc);
 420         }
 421         if (test_facility(57)) /* MSA5 */
 422                 __cpacf_query(CPACF_PRNO, (cpacf_mask_t *)
 423                               kvm_s390_available_subfunc.ppno);
 424
 425         if (test_facility(146)) /* MSA8 */
 426                 __cpacf_query(CPACF_KMA, (cpacf_mask_t *)
 427                               kvm_s390_available_subfunc.kma);
 428
 429         if (test_facility(155)) /* MSA9 */
 430                 __cpacf_query(CPACF_KDSA, (cpacf_mask_t *)
 431                               kvm_s390_available_subfunc.kdsa);
 432
 433         if (test_facility(150)) /* SORTL */
 434                 __insn32_query(INSN_SORTL, kvm_s390_available_subfunc.sortl);
 435
 436         if (test_facility(151)) /* DFLTCC */
 437                 __insn32_query(INSN_DFLTCC, kvm_s390_available_subfunc.dfltcc);
 438
 439         if (MACHINE_HAS_ESOP)
 440                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP);
 441         /*
 442          * We need SIE support, ESOP (PROT_READ protection for gmap_shadow),
 443          * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing).
 444          */
 445         if (!sclp.has_sief2 || !MACHINE_HAS_ESOP || !sclp.has_64bscao ||
 446             !test_facility(3) || !nested)
 447                 return;
 448         allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2);
 449         if (sclp.has_64bscao)
 450                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO);
 451         if (sclp.has_siif)
 452                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF);
 453         if (sclp.has_gpere)
 454                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GPERE);
 455         if (sclp.has_gsls)
 456                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GSLS);
 457         if (sclp.has_ib)
 458                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IB);
 459         if (sclp.has_cei)
 460                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_CEI);
 461         if (sclp.has_ibs)
 462                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IBS);
 463         if (sclp.has_kss)
 464                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_KSS);
 465         /*
 466          * KVM_S390_VM_CPU_FEAT_SKEY: Wrong shadow of PTE.I bits will make
 467          * all skey handling functions read/set the skey from the PGSTE
 468          * instead of the real storage key.
 469          *
 470          * KVM_S390_VM_CPU_FEAT_CMMA: Wrong shadow of PTE.I bits will make
 471          * pages being detected as preserved although they are resident.
 472          *
 473          * KVM_S390_VM_CPU_FEAT_PFMFI: Wrong shadow of PTE.I bits will
 474          * have the same effect as for KVM_S390_VM_CPU_FEAT_SKEY.
 475          *
 476          * For KVM_S390_VM_CPU_FEAT_SKEY, KVM_S390_VM_CPU_FEAT_CMMA and
 477          * KVM_S390_VM_CPU_FEAT_PFMFI, all PTE.I and PGSTE bits have to be
 478          * correctly shadowed. We can do that for the PGSTE but not for PTE.I.
 479          *
 480          * KVM_S390_VM_CPU_FEAT_SIGPIF: Wrong SCB addresses in the SCA. We
 481          * cannot easily shadow the SCA because of the ipte lock.
 482          */
 483 }
 484
 485 int kvm_arch_init(void *opaque)
 486 {
 487         int rc = -ENOMEM;
 488
 489         kvm_s390_dbf = debug_register("kvm-trace", 32, 1, 7 * sizeof(long));
 490         if (!kvm_s390_dbf)
 491                 return -ENOMEM;
 492
 493         kvm_s390_dbf_uv = debug_register("kvm-uv", 32, 1, 7 * sizeof(long));
 494         if (!kvm_s390_dbf_uv)
 495                 goto out;
 496
 497         if (debug_register_view(kvm_s390_dbf, &debug_sprintf_view) ||
 498             debug_register_view(kvm_s390_dbf_uv, &debug_sprintf_view))
 499                 goto out;
 500
 501         kvm_s390_cpu_feat_init();
 502
 503         /* Register floating interrupt controller interface. */
 504         rc = kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC);
 505         if (rc) {
 506                 pr_err("A FLIC registration call failed with rc=%d\n", rc);
 507                 goto out;
 508         }
 509
 510         rc = kvm_s390_gib_init(GAL_ISC);
 511         if (rc)
 512                 goto out;
 513
 514         return 0;
 515
 516 out:
 517         kvm_arch_exit();
 518         return rc;
 519 }
 520
 521 void kvm_arch_exit(void)
 522 {
 523         kvm_s390_gib_destroy();
 524         debug_unregister(kvm_s390_dbf);
 525         debug_unregister(kvm_s390_dbf_uv);
 526 }
 527
 528 /* Section: device related */
 529 long kvm_arch_dev_ioctl(struct file *filp,
 530                         unsigned int ioctl, unsigned long arg)
 531 {
 532         if (ioctl == KVM_S390_ENABLE_SIE)
 533                 return s390_enable_sie();
 534         return -EINVAL;
 535 }
 536
 537 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 538 {
 539         int r;
 540
 541         switch (ext) {
 542         case KVM_CAP_S390_PSW:
 543         case KVM_CAP_S390_GMAP:
 544         case KVM_CAP_SYNC_MMU:
 545 #ifdef CONFIG_KVM_S390_UCONTROL
 546         case KVM_CAP_S390_UCONTROL:
 547 #endif
 548         case KVM_CAP_ASYNC_PF:
 549         case KVM_CAP_SYNC_REGS:
 550         case KVM_CAP_ONE_REG:
 551         case KVM_CAP_ENABLE_CAP:
 552         case KVM_CAP_S390_CSS_SUPPORT:
 553         case KVM_CAP_IOEVENTFD:
 554         case KVM_CAP_DEVICE_CTRL:
 555         case KVM_CAP_S390_IRQCHIP:
 556         case KVM_CAP_VM_ATTRIBUTES:
 557         case KVM_CAP_MP_STATE:
 558         case KVM_CAP_IMMEDIATE_EXIT:
 559         case KVM_CAP_S390_INJECT_IRQ:
 560         case KVM_CAP_S390_USER_SIGP:
 561         case KVM_CAP_S390_USER_STSI:
 562         case KVM_CAP_S390_SKEYS:
 563         case KVM_CAP_S390_IRQ_STATE:
 564         case KVM_CAP_S390_USER_INSTR0:
 565         case KVM_CAP_S390_CMMA_MIGRATION:
 566         case KVM_CAP_S390_AIS:
 567         case KVM_CAP_S390_AIS_MIGRATION:
 568         case KVM_CAP_S390_VCPU_RESETS:
 569         case KVM_CAP_SET_GUEST_DEBUG:
 570         case KVM_CAP_S390_DIAG318:
 571                 r = 1;
 572                 break;
 573         case KVM_CAP_SET_GUEST_DEBUG2:
 574                 r = KVM_GUESTDBG_VALID_MASK;
 575                 break;
 576         case KVM_CAP_S390_HPAGE_1M:
 577                 r = 0;
 578                 if (hpage && !kvm_is_ucontrol(kvm))
 579                         r = 1;
 580                 break;
 581         case KVM_CAP_S390_MEM_OP:
 582                 r = MEM_OP_MAX_SIZE;
 583                 break;
 584         case KVM_CAP_NR_VCPUS:
 585         case KVM_CAP_MAX_VCPUS:
 586         case KVM_CAP_MAX_VCPU_ID:
 587                 r = KVM_S390_BSCA_CPU_SLOTS;
 588                 if (!kvm_s390_use_sca_entries())
 589                         r = KVM_MAX_VCPUS;
 590                 else if (sclp.has_esca && sclp.has_64bscao)
 591                         r = KVM_S390_ESCA_CPU_SLOTS;
 592                 break;
 593         case KVM_CAP_S390_COW:
 594                 r = MACHINE_HAS_ESOP;
 595                 break;
 596         case KVM_CAP_S390_VECTOR_REGISTERS:
 597                 r = MACHINE_HAS_VX;
 598                 break;
 599         case KVM_CAP_S390_RI:
 600                 r = test_facility(64);
 601                 break;
 602         case KVM_CAP_S390_GS:
 603                 r = test_facility(133);
 604                 break;
 605         case KVM_CAP_S390_BPB:
 606                 r = test_facility(82);
 607                 break;
 608         case KVM_CAP_S390_PROTECTED:
 609                 r = is_prot_virt_host();
 610                 break;
 611         default:
 612                 r = 0;
 613         }
 614         return r;
 615 }
 616
 617 void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot)
 618 {
 619         int i;
 620         gfn_t cur_gfn, last_gfn;
 621         unsigned long gaddr, vmaddr;
 622         struct gmap *gmap = kvm->arch.gmap;
 623         DECLARE_BITMAP(bitmap, _PAGE_ENTRIES);
 624
 625         /* Loop over all guest segments */
 626         cur_gfn = memslot->base_gfn;
 627         last_gfn = memslot->base_gfn + memslot->npages;
 628         for (; cur_gfn <= last_gfn; cur_gfn += _PAGE_ENTRIES) {
 629                 gaddr = gfn_to_gpa(cur_gfn);
 630                 vmaddr = gfn_to_hva_memslot(memslot, cur_gfn);
 631                 if (kvm_is_error_hva(vmaddr))
 632                         continue;
 633
 634                 bitmap_zero(bitmap, _PAGE_ENTRIES);
 635                 gmap_sync_dirty_log_pmd(gmap, bitmap, gaddr, vmaddr);
 636                 for (i = 0; i < _PAGE_ENTRIES; i++) {
 637                         if (test_bit(i, bitmap))
 638                                 mark_page_dirty(kvm, cur_gfn + i);
 639                 }
 640
 641                 if (fatal_signal_pending(current))
 642                         return;
 643                 cond_resched();
 644         }
 645 }
 646
 647 /* Section: vm related */
 648 static void sca_del_vcpu(struct kvm_vcpu *vcpu);
 649
 650 /*
 651  * Get (and clear) the dirty memory log for a memory slot.
 652  */
 653 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 654                                struct kvm_dirty_log *log)
 655 {
 656         int r;
 657         unsigned long n;
 658         struct kvm_memory_slot *memslot;
 659         int is_dirty;
 660
 661         if (kvm_is_ucontrol(kvm))
 662                 return -EINVAL;
 663
 664         mutex_lock(&kvm->slots_lock);
 665
 666         r = -EINVAL;
 667         if (log->slot >= KVM_USER_MEM_SLOTS)
 668                 goto out;
 669
 670         r = kvm_get_dirty_log(kvm, log, &is_dirty, &memslot);
 671         if (r)
 672                 goto out;
 673
 674         /* Clear the dirty log */
 675         if (is_dirty) {
 676                 n = kvm_dirty_bitmap_bytes(memslot);
 677                 memset(memslot->dirty_bitmap, 0, n);
 678         }
 679         r = 0;
 680 out:
 681         mutex_unlock(&kvm->slots_lock);
 682         return r;
 683 }
 684
 685 static void icpt_operexc_on_all_vcpus(struct kvm *kvm)
 686 {
 687         unsigned int i;
 688         struct kvm_vcpu *vcpu;
 689
 690         kvm_for_each_vcpu(i, vcpu, kvm) {
 691                 kvm_s390_sync_request(KVM_REQ_ICPT_OPEREXC, vcpu);
 692         }
 693 }
 694
 695 int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
 696 {
 697         int r;
 698
 699         if (cap->flags)
 700                 return -EINVAL;
 701
 702         switch (cap->cap) {
 703         case KVM_CAP_S390_IRQCHIP:
 704                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP");
 705                 kvm->arch.use_irqchip = 1;
 706                 r = 0;
 707                 break;
 708         case KVM_CAP_S390_USER_SIGP:
 709                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP");
 710                 kvm->arch.user_sigp = 1;
 711                 r = 0;
 712                 break;
 713         case KVM_CAP_S390_VECTOR_REGISTERS:
 714                 mutex_lock(&kvm->lock);
 715                 if (kvm->created_vcpus) {
 716                         r = -EBUSY;
 717                 } else if (MACHINE_HAS_VX) {
 718                         set_kvm_facility(kvm->arch.model.fac_mask, 129);
 719                         set_kvm_facility(kvm->arch.model.fac_list, 129);
 720                         if (test_facility(134)) {
 721                                 set_kvm_facility(kvm->arch.model.fac_mask, 134);
 722                                 set_kvm_facility(kvm->arch.model.fac_list, 134);
 723                         }
 724                         if (test_facility(135)) {
 725                                 set_kvm_facility(kvm->arch.model.fac_mask, 135);
 726                                 set_kvm_facility(kvm->arch.model.fac_list, 135);
 727                         }
 728                         if (test_facility(148)) {
 729                                 set_kvm_facility(kvm->arch.model.fac_mask, 148);
 730                                 set_kvm_facility(kvm->arch.model.fac_list, 148);
 731                         }
 732                         if (test_facility(152)) {
 733                                 set_kvm_facility(kvm->arch.model.fac_mask, 152);
 734                                 set_kvm_facility(kvm->arch.model.fac_list, 152);
 735                         }
 736                         if (test_facility(192)) {
 737                                 set_kvm_facility(kvm->arch.model.fac_mask, 192);
 738                                 set_kvm_facility(kvm->arch.model.fac_list, 192);
 739                         }
 740                         r = 0;
 741                 } else
 742                         r = -EINVAL;
 743                 mutex_unlock(&kvm->lock);
 744                 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s",
 745                          r ? "(not available)" : "(success)");
 746                 break;
 747         case KVM_CAP_S390_RI:
 748                 r = -EINVAL;
 749                 mutex_lock(&kvm->lock);
 750                 if (kvm->created_vcpus) {
 751                         r = -EBUSY;
 752                 } else if (test_facility(64)) {
 753                         set_kvm_facility(kvm->arch.model.fac_mask, 64);
 754                         set_kvm_facility(kvm->arch.model.fac_list, 64);
 755                         r = 0;
 756                 }
 757                 mutex_unlock(&kvm->lock);
 758                 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s",
 759                          r ? "(not available)" : "(success)");
 760                 break;
 761         case KVM_CAP_S390_AIS:
 762                 mutex_lock(&kvm->lock);
 763                 if (kvm->created_vcpus) {
 764                         r = -EBUSY;
 765                 } else {
 766                         set_kvm_facility(kvm->arch.model.fac_mask, 72);
 767                         set_kvm_facility(kvm->arch.model.fac_list, 72);
 768                         r = 0;
 769                 }
 770                 mutex_unlock(&kvm->lock);
 771                 VM_EVENT(kvm, 3, "ENABLE: AIS %s",
 772                          r ? "(not available)" : "(success)");
 773                 break;
 774         case KVM_CAP_S390_GS:
 775                 r = -EINVAL;
 776                 mutex_lock(&kvm->lock);
 777                 if (kvm->created_vcpus) {
 778                         r = -EBUSY;
 779                 } else if (test_facility(133)) {
 780                         set_kvm_facility(kvm->arch.model.fac_mask, 133);
 781                         set_kvm_facility(kvm->arch.model.fac_list, 133);
 782                         r = 0;
 783                 }
 784                 mutex_unlock(&kvm->lock);
 785                 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_GS %s",
 786                          r ? "(not available)" : "(success)");
 787                 break;
 788         case KVM_CAP_S390_HPAGE_1M:
 789                 mutex_lock(&kvm->lock);
 790                 if (kvm->created_vcpus)
 791                         r = -EBUSY;
 792                 else if (!hpage || kvm->arch.use_cmma || kvm_is_ucontrol(kvm))
 793                         r = -EINVAL;
 794                 else {
 795                         r = 0;
 796                         mmap_write_lock(kvm->mm);
 797                         kvm->mm->context.allow_gmap_hpage_1m = 1;
 798                         mmap_write_unlock(kvm->mm);
 799                         /*
 800                          * We might have to create fake 4k page
 801                          * tables. To avoid that the hardware works on
 802                          * stale PGSTEs, we emulate these instructions.
 803                          */
 804                         kvm->arch.use_skf = 0;
 805                         kvm->arch.use_pfmfi = 0;
 806                 }
 807                 mutex_unlock(&kvm->lock);
 808                 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_HPAGE %s",
 809                          r ? "(not available)" : "(success)");
 810                 break;
 811         case KVM_CAP_S390_USER_STSI:
 812                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI");
 813                 kvm->arch.user_stsi = 1;
 814                 r = 0;
 815                 break;
 816         case KVM_CAP_S390_USER_INSTR0:
 817                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_INSTR0");
 818                 kvm->arch.user_instr0 = 1;
 819                 icpt_operexc_on_all_vcpus(kvm);
 820                 r = 0;
 821                 break;
 822         default:
 823                 r = -EINVAL;
 824                 break;
 825         }
 826         return r;
 827 }
 828
 829 static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
 830 {
 831         int ret;
 832
 833         switch (attr->attr) {
 834         case KVM_S390_VM_MEM_LIMIT_SIZE:
 835                 ret = 0;
 836                 VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes",
 837                          kvm->arch.mem_limit);
 838                 if (put_user(kvm->arch.mem_limit, (u64 __user *)attr->addr))
 839                         ret = -EFAULT;
 840                 break;
 841         default:
 842                 ret = -ENXIO;
 843                 break;
 844         }
 845         return ret;
 846 }
 847
 848 static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
 849 {
 850         int ret;
 851         unsigned int idx;
 852         switch (attr->attr) {
 853         case KVM_S390_VM_MEM_ENABLE_CMMA:
 854                 ret = -ENXIO;
 855                 if (!sclp.has_cmma)
 856                         break;
 857
 858                 VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support");
 859                 mutex_lock(&kvm->lock);
 860                 if (kvm->created_vcpus)
 861                         ret = -EBUSY;
 862                 else if (kvm->mm->context.allow_gmap_hpage_1m)
 863                         ret = -EINVAL;
 864                 else {
 865                         kvm->arch.use_cmma = 1;
 866                         /* Not compatible with cmma. */
 867                         kvm->arch.use_pfmfi = 0;
 868                         ret = 0;
 869                 }
 870                 mutex_unlock(&kvm->lock);
 871                 break;
 872         case KVM_S390_VM_MEM_CLR_CMMA:
 873                 ret = -ENXIO;
 874                 if (!sclp.has_cmma)
 875                         break;
 876                 ret = -EINVAL;
 877                 if (!kvm->arch.use_cmma)
 878                         break;
 879
 880                 VM_EVENT(kvm, 3, "%s", "RESET: CMMA states");
 881                 mutex_lock(&kvm->lock);
 882                 idx = srcu_read_lock(&kvm->srcu);
 883                 s390_reset_cmma(kvm->arch.gmap->mm);
 884                 srcu_read_unlock(&kvm->srcu, idx);
 885                 mutex_unlock(&kvm->lock);
 886                 ret = 0;
 887                 break;
 888         case KVM_S390_VM_MEM_LIMIT_SIZE: {
 889                 unsigned long new_limit;
 890
 891                 if (kvm_is_ucontrol(kvm))
 892                         return -EINVAL;
 893
 894                 if (get_user(new_limit, (u64 __user *)attr->addr))
 895                         return -EFAULT;
 896
 897                 if (kvm->arch.mem_limit != KVM_S390_NO_MEM_LIMIT &&
 898                     new_limit > kvm->arch.mem_limit)
 899                         return -E2BIG;
 900
 901                 if (!new_limit)
 902                         return -EINVAL;
 903
 904                 /* gmap_create takes last usable address */
 905                 if (new_limit != KVM_S390_NO_MEM_LIMIT)
 906                         new_limit -= 1;
 907
 908                 ret = -EBUSY;
 909                 mutex_lock(&kvm->lock);
 910                 if (!kvm->created_vcpus) {
 911                         /* gmap_create will round the limit up */
 912                         struct gmap *new = gmap_create(current->mm, new_limit);
 913
 914                         if (!new) {
 915                                 ret = -ENOMEM;
 916                         } else {
 917                                 gmap_remove(kvm->arch.gmap);
 918                                 new->private = kvm;
 919                                 kvm->arch.gmap = new;
 920                                 ret = 0;
 921                         }
 922                 }
 923                 mutex_unlock(&kvm->lock);
 924                 VM_EVENT(kvm, 3, "SET: max guest address: %lu", new_limit);
 925                 VM_EVENT(kvm, 3, "New guest asce: 0x%pK",
 926                          (void *) kvm->arch.gmap->asce);
 927                 break;
 928         }
 929         default:
 930                 ret = -ENXIO;
 931                 break;
 932         }
 933         return ret;
 934 }
 935
 936 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu);
 937
 938 void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm)
 939 {
 940         struct kvm_vcpu *vcpu;
 941         int i;
 942
 943         kvm_s390_vcpu_block_all(kvm);
 944
 945         kvm_for_each_vcpu(i, vcpu, kvm) {
 946                 kvm_s390_vcpu_crypto_setup(vcpu);
 947                 /* recreate the shadow crycb by leaving the VSIE handler */
 948                 kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu);
 949         }
 950
 951         kvm_s390_vcpu_unblock_all(kvm);
 952 }
 953
 954 static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
 955 {
 956         mutex_lock(&kvm->lock);
 957         switch (attr->attr) {
 958         case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
 959                 if (!test_kvm_facility(kvm, 76)) {
 960                         mutex_unlock(&kvm->lock);
 961                         return -EINVAL;
 962                 }
 963                 get_random_bytes(
 964                         kvm->arch.crypto.crycb->aes_wrapping_key_mask,
 965                         sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
 966                 kvm->arch.crypto.aes_kw = 1;
 967                 VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support");
 968                 break;
 969         case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
 970                 if (!test_kvm_facility(kvm, 76)) {
 971                         mutex_unlock(&kvm->lock);
 972                         return -EINVAL;
 973                 }
 974                 get_random_bytes(
 975                         kvm->arch.crypto.crycb->dea_wrapping_key_mask,
 976                         sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
 977                 kvm->arch.crypto.dea_kw = 1;
 978                 VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support");
 979                 break;
 980         case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
 981                 if (!test_kvm_facility(kvm, 76)) {
 982                         mutex_unlock(&kvm->lock);
 983                         return -EINVAL;
 984                 }
 985                 kvm->arch.crypto.aes_kw = 0;
 986                 memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0,
 987                         sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
 988                 VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support");
 989                 break;
 990         case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
 991                 if (!test_kvm_facility(kvm, 76)) {
 992                         mutex_unlock(&kvm->lock);
 993                         return -EINVAL;
 994                 }
 995                 kvm->arch.crypto.dea_kw = 0;
 996                 memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0,
 997                         sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
 998                 VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support");
 999                 break;
1000         case KVM_S390_VM_CRYPTO_ENABLE_APIE:
1001                 if (!ap_instructions_available()) {
1002                         mutex_unlock(&kvm->lock);
1003                         return -EOPNOTSUPP;
1004                 }
1005                 kvm->arch.crypto.apie = 1;
1006                 break;
1007         case KVM_S390_VM_CRYPTO_DISABLE_APIE:
1008                 if (!ap_instructions_available()) {
1009                         mutex_unlock(&kvm->lock);
1010                         return -EOPNOTSUPP;
1011                 }
1012                 kvm->arch.crypto.apie = 0;
1013                 break;
1014         default:
1015                 mutex_unlock(&kvm->lock);
1016                 return -ENXIO;
1017         }
1018
1019         kvm_s390_vcpu_crypto_reset_all(kvm);
1020         mutex_unlock(&kvm->lock);
1021         return 0;
1022 }
1023
1024 static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req)
1025 {
1026         int cx;
1027         struct kvm_vcpu *vcpu;
1028
1029         kvm_for_each_vcpu(cx, vcpu, kvm)
1030                 kvm_s390_sync_request(req, vcpu);
1031 }
1032
1033 /*
1034  * Must be called with kvm->srcu held to avoid races on memslots, and with
1035  * kvm->slots_lock to avoid races with ourselves and kvm_s390_vm_stop_migration.
1036  */
1037 static int kvm_s390_vm_start_migration(struct kvm *kvm)
1038 {
1039         struct kvm_memory_slot *ms;
1040         struct kvm_memslots *slots;
1041         unsigned long ram_pages = 0;
1042         int slotnr;
1043
1044         /* migration mode already enabled */
1045         if (kvm->arch.migration_mode)
1046                 return 0;
1047         slots = kvm_memslots(kvm);
1048         if (!slots || !slots->used_slots)
1049                 return -EINVAL;
1050
1051         if (!kvm->arch.use_cmma) {
1052                 kvm->arch.migration_mode = 1;
1053                 return 0;
1054         }
1055         /* mark all the pages in active slots as dirty */
1056         for (slotnr = 0; slotnr < slots->used_slots; slotnr++) {
1057                 ms = slots->memslots + slotnr;
1058                 if (!ms->dirty_bitmap)
1059                         return -EINVAL;
1060                 /*
1061                  * The second half of the bitmap is only used on x86,
1062                  * and would be wasted otherwise, so we put it to good
1063                  * use here to keep track of the state of the storage
1064                  * attributes.
1065                  */
1066                 memset(kvm_second_dirty_bitmap(ms), 0xff, kvm_dirty_bitmap_bytes(ms));
1067                 ram_pages += ms->npages;
1068         }
1069         atomic64_set(&kvm->arch.cmma_dirty_pages, ram_pages);
1070         kvm->arch.migration_mode = 1;
1071         kvm_s390_sync_request_broadcast(kvm, KVM_REQ_START_MIGRATION);
1072         return 0;
1073 }
1074
1075 /*
1076  * Must be called with kvm->slots_lock to avoid races with ourselves and
1077  * kvm_s390_vm_start_migration.
1078  */
1079 static int kvm_s390_vm_stop_migration(struct kvm *kvm)
1080 {
1081         /* migration mode already disabled */
1082         if (!kvm->arch.migration_mode)
1083                 return 0;
1084         kvm->arch.migration_mode = 0;
1085         if (kvm->arch.use_cmma)
1086                 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_STOP_MIGRATION);
1087         return 0;
1088 }
1089
1090 static int kvm_s390_vm_set_migration(struct kvm *kvm,
1091                                      struct kvm_device_attr *attr)
1092 {
1093         int res = -ENXIO;
1094
1095         mutex_lock(&kvm->slots_lock);
1096         switch (attr->attr) {
1097         case KVM_S390_VM_MIGRATION_START:
1098                 res = kvm_s390_vm_start_migration(kvm);
1099                 break;
1100         case KVM_S390_VM_MIGRATION_STOP:
1101                 res = kvm_s390_vm_stop_migration(kvm);
1102                 break;
1103         default:
1104                 break;
1105         }
1106         mutex_unlock(&kvm->slots_lock);
1107
1108         return res;
1109 }
1110
1111 static int kvm_s390_vm_get_migration(struct kvm *kvm,
1112                                      struct kvm_device_attr *attr)
1113 {
1114         u64 mig = kvm->arch.migration_mode;
1115
1116         if (attr->attr != KVM_S390_VM_MIGRATION_STATUS)
1117                 return -ENXIO;
1118
1119         if (copy_to_user((void __user *)attr->addr, &mig, sizeof(mig)))
1120                 return -EFAULT;
1121         return 0;
1122 }
1123
1124 static int kvm_s390_set_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
1125 {
1126         struct kvm_s390_vm_tod_clock gtod;
1127
1128         if (copy_from_user(&gtod, (void __user *)attr->addr, sizeof(gtod)))
1129                 return -EFAULT;
1130
1131         if (!test_kvm_facility(kvm, 139) && gtod.epoch_idx)
1132                 return -EINVAL;
1133         kvm_s390_set_tod_clock(kvm, &gtod);
1134
1135         VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x, TOD base: 0x%llx",
1136                 gtod.epoch_idx, gtod.tod);
1137
1138         return 0;
1139 }
1140
1141 static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
1142 {
1143         u8 gtod_high;
1144
1145         if (copy_from_user(&gtod_high, (void __user *)attr->addr,
1146                                            sizeof(gtod_high)))
1147                 return -EFAULT;
1148
1149         if (gtod_high != 0)
1150                 return -EINVAL;
1151         VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high);
1152
1153         return 0;
1154 }
1155
1156 static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
1157 {
1158         struct kvm_s390_vm_tod_clock gtod = { 0 };
1159
1160         if (copy_from_user(&gtod.tod, (void __user *)attr->addr,
1161                            sizeof(gtod.tod)))
1162                 return -EFAULT;
1163
1164         kvm_s390_set_tod_clock(kvm, &gtod);
1165         VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod.tod);
1166         return 0;
1167 }
1168
1169 static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr)
1170 {
1171         int ret;
1172
1173         if (attr->flags)
1174                 return -EINVAL;
1175
1176         switch (attr->attr) {
1177         case KVM_S390_VM_TOD_EXT:
1178                 ret = kvm_s390_set_tod_ext(kvm, attr);
1179                 break;
1180         case KVM_S390_VM_TOD_HIGH:
1181                 ret = kvm_s390_set_tod_high(kvm, attr);
1182                 break;
1183         case KVM_S390_VM_TOD_LOW:
1184                 ret = kvm_s390_set_tod_low(kvm, attr);
1185                 break;
1186         default:
1187                 ret = -ENXIO;
1188                 break;
1189         }
1190         return ret;
1191 }
1192
1193 static void kvm_s390_get_tod_clock(struct kvm *kvm,
1194                                    struct kvm_s390_vm_tod_clock *gtod)
1195 {
1196         union tod_clock clk;
1197
1198         preempt_disable();
1199
1200         store_tod_clock_ext(&clk);
1201
1202         gtod->tod = clk.tod + kvm->arch.epoch;
1203         gtod->epoch_idx = 0;
1204         if (test_kvm_facility(kvm, 139)) {
1205                 gtod->epoch_idx = clk.ei + kvm->arch.epdx;
1206                 if (gtod->tod < clk.tod)
1207                         gtod->epoch_idx += 1;
1208         }
1209
1210         preempt_enable();
1211 }
1212
1213 static int kvm_s390_get_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
1214 {
1215         struct kvm_s390_vm_tod_clock gtod;
1216
1217         memset(&gtod, 0, sizeof(gtod));
1218         kvm_s390_get_tod_clock(kvm, &gtod);
1219         if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
1220                 return -EFAULT;
1221
1222         VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x, TOD base: 0x%llx",
1223                 gtod.epoch_idx, gtod.tod);
1224         return 0;
1225 }
1226
1227 static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
1228 {
1229         u8 gtod_high = 0;
1230
1231         if (copy_to_user((void __user *)attr->addr, &gtod_high,
1232                                          sizeof(gtod_high)))
1233                 return -EFAULT;
1234         VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high);
1235
1236         return 0;
1237 }
1238
1239 static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
1240 {
1241         u64 gtod;
1242
1243         gtod = kvm_s390_get_tod_clock_fast(kvm);
1244         if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
1245                 return -EFAULT;
1246         VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod);
1247
1248         return 0;
1249 }
1250
1251 static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr)
1252 {
1253         int ret;
1254
1255         if (attr->flags)
1256                 return -EINVAL;
1257
1258         switch (attr->attr) {
1259         case KVM_S390_VM_TOD_EXT:
1260                 ret = kvm_s390_get_tod_ext(kvm, attr);
1261                 break;
1262         case KVM_S390_VM_TOD_HIGH:
1263                 ret = kvm_s390_get_tod_high(kvm, attr);
1264                 break;
1265         case KVM_S390_VM_TOD_LOW:
1266                 ret = kvm_s390_get_tod_low(kvm, attr);
1267                 break;
1268         default:
1269                 ret = -ENXIO;
1270                 break;
1271         }
1272         return ret;
1273 }
1274
1275 static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr)
1276 {
1277         struct kvm_s390_vm_cpu_processor *proc;
1278         u16 lowest_ibc, unblocked_ibc;
1279         int ret = 0;
1280
1281         mutex_lock(&kvm->lock);
1282         if (kvm->created_vcpus) {
1283                 ret = -EBUSY;
1284                 goto out;
1285         }
1286         proc = kzalloc(sizeof(*proc), GFP_KERNEL_ACCOUNT);
1287         if (!proc) {
1288                 ret = -ENOMEM;
1289                 goto out;
1290         }
1291         if (!copy_from_user(proc, (void __user *)attr->addr,
1292                             sizeof(*proc))) {
1293                 kvm->arch.model.cpuid = proc->cpuid;
1294                 lowest_ibc = sclp.ibc >> 16 & 0xfff;
1295                 unblocked_ibc = sclp.ibc & 0xfff;
1296                 if (lowest_ibc && proc->ibc) {
1297                         if (proc->ibc > unblocked_ibc)
1298                                 kvm->arch.model.ibc = unblocked_ibc;
1299                         else if (proc->ibc < lowest_ibc)
1300                                 kvm->arch.model.ibc = lowest_ibc;
1301                         else
1302                                 kvm->arch.model.ibc = proc->ibc;
1303                 }
1304                 memcpy(kvm->arch.model.fac_list, proc->fac_list,
1305                        S390_ARCH_FAC_LIST_SIZE_BYTE);
1306                 VM_EVENT(kvm, 3, "SET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
1307                          kvm->arch.model.ibc,
1308                          kvm->arch.model.cpuid);
1309                 VM_EVENT(kvm, 3, "SET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
1310                          kvm->arch.model.fac_list[0],
1311                          kvm->arch.model.fac_list[1],
1312                          kvm->arch.model.fac_list[2]);
1313         } else
1314                 ret = -EFAULT;
1315         kfree(proc);
1316 out:
1317         mutex_unlock(&kvm->lock);
1318         return ret;
1319 }
1320
1321 static int kvm_s390_set_processor_feat(struct kvm *kvm,
1322                                        struct kvm_device_attr *attr)
1323 {
1324         struct kvm_s390_vm_cpu_feat data;
1325
1326         if (copy_from_user(&data, (void __user *)attr->addr, sizeof(data)))
1327                 return -EFAULT;
1328         if (!bitmap_subset((unsigned long *) data.feat,
1329                            kvm_s390_available_cpu_feat,
1330                            KVM_S390_VM_CPU_FEAT_NR_BITS))
1331                 return -EINVAL;
1332
1333         mutex_lock(&kvm->lock);
1334         if (kvm->created_vcpus) {
1335                 mutex_unlock(&kvm->lock);
1336                 return -EBUSY;
1337         }
1338         bitmap_copy(kvm->arch.cpu_feat, (unsigned long *) data.feat,
1339                     KVM_S390_VM_CPU_FEAT_NR_BITS);
1340         mutex_unlock(&kvm->lock);
1341         VM_EVENT(kvm, 3, "SET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx",
1342                          data.feat[0],
1343                          data.feat[1],
1344                          data.feat[2]);
1345         return 0;
1346 }
1347
1348 static int kvm_s390_set_processor_subfunc(struct kvm *kvm,
1349                                           struct kvm_device_attr *attr)
1350 {
1351         mutex_lock(&kvm->lock);
1352         if (kvm->created_vcpus) {
1353                 mutex_unlock(&kvm->lock);
1354                 return -EBUSY;
1355         }
1356
1357         if (copy_from_user(&kvm->arch.model.subfuncs, (void __user *)attr->addr,
1358                            sizeof(struct kvm_s390_vm_cpu_subfunc))) {
1359                 mutex_unlock(&kvm->lock);
1360                 return -EFAULT;
1361         }
1362         mutex_unlock(&kvm->lock);
1363
1364         VM_EVENT(kvm, 3, "SET: guest PLO    subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1365                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0],
1366                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1],
1367                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2],
1368                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]);
1369         VM_EVENT(kvm, 3, "SET: guest PTFF   subfunc 0x%16.16lx.%16.16lx",
1370                  ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0],
1371                  ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]);
1372         VM_EVENT(kvm, 3, "SET: guest KMAC   subfunc 0x%16.16lx.%16.16lx",
1373                  ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0],
1374                  ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]);
1375         VM_EVENT(kvm, 3, "SET: guest KMC    subfunc 0x%16.16lx.%16.16lx",
1376                  ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0],
1377                  ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]);
1378         VM_EVENT(kvm, 3, "SET: guest KM     subfunc 0x%16.16lx.%16.16lx",
1379                  ((unsigned long *) &kvm->arch.model.subfuncs.km)[0],
1380                  ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]);
1381         VM_EVENT(kvm, 3, "SET: guest KIMD   subfunc 0x%16.16lx.%16.16lx",
1382                  ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0],
1383                  ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]);
1384         VM_EVENT(kvm, 3, "SET: guest KLMD   subfunc 0x%16.16lx.%16.16lx",
1385                  ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0],
1386                  ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]);
1387         VM_EVENT(kvm, 3, "SET: guest PCKMO  subfunc 0x%16.16lx.%16.16lx",
1388                  ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0],
1389                  ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]);
1390         VM_EVENT(kvm, 3, "SET: guest KMCTR  subfunc 0x%16.16lx.%16.16lx",
1391                  ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0],
1392                  ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]);
1393         VM_EVENT(kvm, 3, "SET: guest KMF    subfunc 0x%16.16lx.%16.16lx",
1394                  ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0],
1395                  ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]);
1396         VM_EVENT(kvm, 3, "SET: guest KMO    subfunc 0x%16.16lx.%16.16lx",
1397                  ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0],
1398                  ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]);
1399         VM_EVENT(kvm, 3, "SET: guest PCC    subfunc 0x%16.16lx.%16.16lx",
1400                  ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0],
1401                  ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]);
1402         VM_EVENT(kvm, 3, "SET: guest PPNO   subfunc 0x%16.16lx.%16.16lx",
1403                  ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0],
1404                  ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]);
1405         VM_EVENT(kvm, 3, "SET: guest KMA    subfunc 0x%16.16lx.%16.16lx",
1406                  ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0],
1407                  ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]);
1408         VM_EVENT(kvm, 3, "SET: guest KDSA   subfunc 0x%16.16lx.%16.16lx",
1409                  ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0],
1410                  ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]);
1411         VM_EVENT(kvm, 3, "SET: guest SORTL  subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1412                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0],
1413                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1],
1414                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2],
1415                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]);
1416         VM_EVENT(kvm, 3, "SET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1417                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0],
1418                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1],
1419                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2],
1420                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]);
1421
1422         return 0;
1423 }
1424
1425 static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
1426 {
1427         int ret = -ENXIO;
1428
1429         switch (attr->attr) {
1430         case KVM_S390_VM_CPU_PROCESSOR:
1431                 ret = kvm_s390_set_processor(kvm, attr);
1432                 break;
1433         case KVM_S390_VM_CPU_PROCESSOR_FEAT:
1434                 ret = kvm_s390_set_processor_feat(kvm, attr);
1435                 break;
1436         case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1437                 ret = kvm_s390_set_processor_subfunc(kvm, attr);
1438                 break;
1439         }
1440         return ret;
1441 }
1442
1443 static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr)
1444 {
1445         struct kvm_s390_vm_cpu_processor *proc;
1446         int ret = 0;
1447
1448         proc = kzalloc(sizeof(*proc), GFP_KERNEL_ACCOUNT);
1449         if (!proc) {
1450                 ret = -ENOMEM;
1451                 goto out;
1452         }
1453         proc->cpuid = kvm->arch.model.cpuid;
1454         proc->ibc = kvm->arch.model.ibc;
1455         memcpy(&proc->fac_list, kvm->arch.model.fac_list,
1456                S390_ARCH_FAC_LIST_SIZE_BYTE);
1457         VM_EVENT(kvm, 3, "GET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
1458                  kvm->arch.model.ibc,
1459                  kvm->arch.model.cpuid);
1460         VM_EVENT(kvm, 3, "GET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
1461                  kvm->arch.model.fac_list[0],
1462                  kvm->arch.model.fac_list[1],
1463                  kvm->arch.model.fac_list[2]);
1464         if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc)))
1465                 ret = -EFAULT;
1466         kfree(proc);
1467 out:
1468         return ret;
1469 }
1470
1471 static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr)
1472 {
1473         struct kvm_s390_vm_cpu_machine *mach;
1474         int ret = 0;
1475
1476         mach = kzalloc(sizeof(*mach), GFP_KERNEL_ACCOUNT);
1477         if (!mach) {
1478                 ret = -ENOMEM;
1479                 goto out;
1480         }
1481         get_cpu_id((struct cpuid *) &mach->cpuid);
1482         mach->ibc = sclp.ibc;
1483         memcpy(&mach->fac_mask, kvm->arch.model.fac_mask,
1484                S390_ARCH_FAC_LIST_SIZE_BYTE);
1485         memcpy((unsigned long *)&mach->fac_list, stfle_fac_list,
1486                sizeof(stfle_fac_list));
1487         VM_EVENT(kvm, 3, "GET: host ibc:  0x%4.4x, host cpuid:  0x%16.16llx",
1488                  kvm->arch.model.ibc,
1489                  kvm->arch.model.cpuid);
1490         VM_EVENT(kvm, 3, "GET: host facmask:  0x%16.16llx.%16.16llx.%16.16llx",
1491                  mach->fac_mask[0],
1492                  mach->fac_mask[1],
1493                  mach->fac_mask[2]);
1494         VM_EVENT(kvm, 3, "GET: host faclist:  0x%16.16llx.%16.16llx.%16.16llx",
1495                  mach->fac_list[0],
1496                  mach->fac_list[1],
1497                  mach->fac_list[2]);
1498         if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach)))
1499                 ret = -EFAULT;
1500         kfree(mach);
1501 out:
1502         return ret;
1503 }
1504
1505 static int kvm_s390_get_processor_feat(struct kvm *kvm,
1506                                        struct kvm_device_attr *attr)
1507 {
1508         struct kvm_s390_vm_cpu_feat data;
1509
1510         bitmap_copy((unsigned long *) data.feat, kvm->arch.cpu_feat,
1511                     KVM_S390_VM_CPU_FEAT_NR_BITS);
1512         if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
1513                 return -EFAULT;
1514         VM_EVENT(kvm, 3, "GET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx",
1515                          data.feat[0],
1516                          data.feat[1],
1517                          data.feat[2]);
1518         return 0;
1519 }
1520
1521 static int kvm_s390_get_machine_feat(struct kvm *kvm,
1522                                      struct kvm_device_attr *attr)
1523 {
1524         struct kvm_s390_vm_cpu_feat data;
1525
1526         bitmap_copy((unsigned long *) data.feat,
1527                     kvm_s390_available_cpu_feat,
1528                     KVM_S390_VM_CPU_FEAT_NR_BITS);
1529         if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
1530                 return -EFAULT;
1531         VM_EVENT(kvm, 3, "GET: host feat:  0x%16.16llx.0x%16.16llx.0x%16.16llx",
1532                          data.feat[0],
1533                          data.feat[1],
1534                          data.feat[2]);
1535         return 0;
1536 }
1537
1538 static int kvm_s390_get_processor_subfunc(struct kvm *kvm,
1539                                           struct kvm_device_attr *attr)
1540 {
1541         if (copy_to_user((void __user *)attr->addr, &kvm->arch.model.subfuncs,
1542             sizeof(struct kvm_s390_vm_cpu_subfunc)))
1543                 return -EFAULT;
1544
1545         VM_EVENT(kvm, 3, "GET: guest PLO    subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1546                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0],
1547                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1],
1548                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2],
1549                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]);
1550         VM_EVENT(kvm, 3, "GET: guest PTFF   subfunc 0x%16.16lx.%16.16lx",
1551                  ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0],
1552                  ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]);
1553         VM_EVENT(kvm, 3, "GET: guest KMAC   subfunc 0x%16.16lx.%16.16lx",
1554                  ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0],
1555                  ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]);
1556         VM_EVENT(kvm, 3, "GET: guest KMC    subfunc 0x%16.16lx.%16.16lx",
1557                  ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0],
1558                  ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]);
1559         VM_EVENT(kvm, 3, "GET: guest KM     subfunc 0x%16.16lx.%16.16lx",
1560                  ((unsigned long *) &kvm->arch.model.subfuncs.km)[0],
1561                  ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]);
1562         VM_EVENT(kvm, 3, "GET: guest KIMD   subfunc 0x%16.16lx.%16.16lx",
1563                  ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0],
1564                  ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]);
1565         VM_EVENT(kvm, 3, "GET: guest KLMD   subfunc 0x%16.16lx.%16.16lx",
1566                  ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0],
1567                  ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]);
1568         VM_EVENT(kvm, 3, "GET: guest PCKMO  subfunc 0x%16.16lx.%16.16lx",
1569                  ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0],
1570                  ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]);
1571         VM_EVENT(kvm, 3, "GET: guest KMCTR  subfunc 0x%16.16lx.%16.16lx",
1572                  ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0],
1573                  ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]);
1574         VM_EVENT(kvm, 3, "GET: guest KMF    subfunc 0x%16.16lx.%16.16lx",
1575                  ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0],
1576                  ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]);
1577         VM_EVENT(kvm, 3, "GET: guest KMO    subfunc 0x%16.16lx.%16.16lx",
1578                  ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0],
1579                  ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]);
1580         VM_EVENT(kvm, 3, "GET: guest PCC    subfunc 0x%16.16lx.%16.16lx",
1581                  ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0],
1582                  ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]);
1583         VM_EVENT(kvm, 3, "GET: guest PPNO   subfunc 0x%16.16lx.%16.16lx",
1584                  ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0],
1585                  ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]);
1586         VM_EVENT(kvm, 3, "GET: guest KMA    subfunc 0x%16.16lx.%16.16lx",
1587                  ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0],
1588                  ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]);
1589         VM_EVENT(kvm, 3, "GET: guest KDSA   subfunc 0x%16.16lx.%16.16lx",
1590                  ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0],
1591                  ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]);
1592         VM_EVENT(kvm, 3, "GET: guest SORTL  subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1593                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0],
1594                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1],
1595                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2],
1596                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]);
1597         VM_EVENT(kvm, 3, "GET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1598                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0],
1599                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1],
1600                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2],
1601                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]);
1602
1603         return 0;
1604 }
1605
1606 static int kvm_s390_get_machine_subfunc(struct kvm *kvm,
1607                                         struct kvm_device_attr *attr)
1608 {
1609         if (copy_to_user((void __user *)attr->addr, &kvm_s390_available_subfunc,
1610             sizeof(struct kvm_s390_vm_cpu_subfunc)))
1611                 return -EFAULT;
1612
1613         VM_EVENT(kvm, 3, "GET: host  PLO    subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1614                  ((unsigned long *) &kvm_s390_available_subfunc.plo)[0],
1615                  ((unsigned long *) &kvm_s390_available_subfunc.plo)[1],
1616                  ((unsigned long *) &kvm_s390_available_subfunc.plo)[2],
1617                  ((unsigned long *) &kvm_s390_available_subfunc.plo)[3]);
1618         VM_EVENT(kvm, 3, "GET: host  PTFF   subfunc 0x%16.16lx.%16.16lx",
1619                  ((unsigned long *) &kvm_s390_available_subfunc.ptff)[0],
1620                  ((unsigned long *) &kvm_s390_available_subfunc.ptff)[1]);
1621         VM_EVENT(kvm, 3, "GET: host  KMAC   subfunc 0x%16.16lx.%16.16lx",
1622                  ((unsigned long *) &kvm_s390_available_subfunc.kmac)[0],
1623                  ((unsigned long *) &kvm_s390_available_subfunc.kmac)[1]);
1624         VM_EVENT(kvm, 3, "GET: host  KMC    subfunc 0x%16.16lx.%16.16lx",
1625                  ((unsigned long *) &kvm_s390_available_subfunc.kmc)[0],
1626                  ((unsigned long *) &kvm_s390_available_subfunc.kmc)[1]);
1627         VM_EVENT(kvm, 3, "GET: host  KM     subfunc 0x%16.16lx.%16.16lx",
1628                  ((unsigned long *) &kvm_s390_available_subfunc.km)[0],
1629                  ((unsigned long *) &kvm_s390_available_subfunc.km)[1]);
1630         VM_EVENT(kvm, 3, "GET: host  KIMD   subfunc 0x%16.16lx.%16.16lx",
1631                  ((unsigned long *) &kvm_s390_available_subfunc.kimd)[0],
1632                  ((unsigned long *) &kvm_s390_available_subfunc.kimd)[1]);
1633         VM_EVENT(kvm, 3, "GET: host  KLMD   subfunc 0x%16.16lx.%16.16lx",
1634                  ((unsigned long *) &kvm_s390_available_subfunc.klmd)[0],
1635                  ((unsigned long *) &kvm_s390_available_subfunc.klmd)[1]);
1636         VM_EVENT(kvm, 3, "GET: host  PCKMO  subfunc 0x%16.16lx.%16.16lx",
1637                  ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[0],
1638                  ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[1]);
1639         VM_EVENT(kvm, 3, "GET: host  KMCTR  subfunc 0x%16.16lx.%16.16lx",
1640                  ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[0],
1641                  ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[1]);
1642         VM_EVENT(kvm, 3, "GET: host  KMF    subfunc 0x%16.16lx.%16.16lx",
1643                  ((unsigned long *) &kvm_s390_available_subfunc.kmf)[0],
1644                  ((unsigned long *) &kvm_s390_available_subfunc.kmf)[1]);
1645         VM_EVENT(kvm, 3, "GET: host  KMO    subfunc 0x%16.16lx.%16.16lx",
1646                  ((unsigned long *) &kvm_s390_available_subfunc.kmo)[0],
1647                  ((unsigned long *) &kvm_s390_available_subfunc.kmo)[1]);
1648         VM_EVENT(kvm, 3, "GET: host  PCC    subfunc 0x%16.16lx.%16.16lx",
1649                  ((unsigned long *) &kvm_s390_available_subfunc.pcc)[0],
1650                  ((unsigned long *) &kvm_s390_available_subfunc.pcc)[1]);
1651         VM_EVENT(kvm, 3, "GET: host  PPNO   subfunc 0x%16.16lx.%16.16lx",
1652                  ((unsigned long *) &kvm_s390_available_subfunc.ppno)[0],
1653                  ((unsigned long *) &kvm_s390_available_subfunc.ppno)[1]);
1654         VM_EVENT(kvm, 3, "GET: host  KMA    subfunc 0x%16.16lx.%16.16lx",
1655                  ((unsigned long *) &kvm_s390_available_subfunc.kma)[0],
1656                  ((unsigned long *) &kvm_s390_available_subfunc.kma)[1]);
1657         VM_EVENT(kvm, 3, "GET: host  KDSA   subfunc 0x%16.16lx.%16.16lx",
1658                  ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[0],
1659                  ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[1]);
1660         VM_EVENT(kvm, 3, "GET: host  SORTL  subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1661                  ((unsigned long *) &kvm_s390_available_subfunc.sortl)[0],
1662                  ((unsigned long *) &kvm_s390_available_subfunc.sortl)[1],
1663                  ((unsigned long *) &kvm_s390_available_subfunc.sortl)[2],
1664                  ((unsigned long *) &kvm_s390_available_subfunc.sortl)[3]);
1665         VM_EVENT(kvm, 3, "GET: host  DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1666                  ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[0],
1667                  ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[1],
1668                  ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[2],
1669                  ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[3]);
1670
1671         return 0;
1672 }
1673
1674 static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
1675 {
1676         int ret = -ENXIO;
1677
1678         switch (attr->attr) {
1679         case KVM_S390_VM_CPU_PROCESSOR:
1680                 ret = kvm_s390_get_processor(kvm, attr);
1681                 break;
1682         case KVM_S390_VM_CPU_MACHINE:
1683                 ret = kvm_s390_get_machine(kvm, attr);
1684                 break;
1685         case KVM_S390_VM_CPU_PROCESSOR_FEAT:
1686                 ret = kvm_s390_get_processor_feat(kvm, attr);
1687                 break;
1688         case KVM_S390_VM_CPU_MACHINE_FEAT:
1689                 ret = kvm_s390_get_machine_feat(kvm, attr);
1690                 break;
1691         case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1692                 ret = kvm_s390_get_processor_subfunc(kvm, attr);
1693                 break;
1694         case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
1695                 ret = kvm_s390_get_machine_subfunc(kvm, attr);
1696                 break;
1697         }
1698         return ret;
1699 }
1700
1701 static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1702 {
1703         int ret;
1704
1705         switch (attr->group) {
1706         case KVM_S390_VM_MEM_CTRL:
1707                 ret = kvm_s390_set_mem_control(kvm, attr);
1708                 break;
1709         case KVM_S390_VM_TOD:
1710                 ret = kvm_s390_set_tod(kvm, attr);
1711                 break;
1712         case KVM_S390_VM_CPU_MODEL:
1713                 ret = kvm_s390_set_cpu_model(kvm, attr);
1714                 break;
1715         case KVM_S390_VM_CRYPTO:
1716                 ret = kvm_s390_vm_set_crypto(kvm, attr);
1717                 break;
1718         case KVM_S390_VM_MIGRATION:
1719                 ret = kvm_s390_vm_set_migration(kvm, attr);
1720                 break;
1721         default:
1722                 ret = -ENXIO;
1723                 break;
1724         }
1725
1726         return ret;
1727 }
1728
1729 static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1730 {
1731         int ret;
1732
1733         switch (attr->group) {
1734         case KVM_S390_VM_MEM_CTRL:
1735                 ret = kvm_s390_get_mem_control(kvm, attr);
1736                 break;
1737         case KVM_S390_VM_TOD:
1738                 ret = kvm_s390_get_tod(kvm, attr);
1739                 break;
1740         case KVM_S390_VM_CPU_MODEL:
1741                 ret = kvm_s390_get_cpu_model(kvm, attr);
1742                 break;
1743         case KVM_S390_VM_MIGRATION:
1744                 ret = kvm_s390_vm_get_migration(kvm, attr);
1745                 break;
1746         default:
1747                 ret = -ENXIO;
1748                 break;
1749         }
1750
1751         return ret;
1752 }
1753
1754 static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1755 {
1756         int ret;
1757
1758         switch (attr->group) {
1759         case KVM_S390_VM_MEM_CTRL:
1760                 switch (attr->attr) {
1761                 case KVM_S390_VM_MEM_ENABLE_CMMA:
1762                 case KVM_S390_VM_MEM_CLR_CMMA:
1763                         ret = sclp.has_cmma ? 0 : -ENXIO;
1764                         break;
1765                 case KVM_S390_VM_MEM_LIMIT_SIZE:
1766                         ret = 0;
1767                         break;
1768                 default:
1769                         ret = -ENXIO;
1770                         break;
1771                 }
1772                 break;
1773         case KVM_S390_VM_TOD:
1774                 switch (attr->attr) {
1775                 case KVM_S390_VM_TOD_LOW:
1776                 case KVM_S390_VM_TOD_HIGH:
1777                         ret = 0;
1778                         break;
1779                 default:
1780                         ret = -ENXIO;
1781                         break;
1782                 }
1783                 break;
1784         case KVM_S390_VM_CPU_MODEL:
1785                 switch (attr->attr) {
1786                 case KVM_S390_VM_CPU_PROCESSOR:
1787                 case KVM_S390_VM_CPU_MACHINE:
1788                 case KVM_S390_VM_CPU_PROCESSOR_FEAT:
1789                 case KVM_S390_VM_CPU_MACHINE_FEAT:
1790                 case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
1791                 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1792                         ret = 0;
1793                         break;
1794                 default:
1795                         ret = -ENXIO;
1796                         break;
1797                 }
1798                 break;
1799         case KVM_S390_VM_CRYPTO:
1800                 switch (attr->attr) {
1801                 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
1802                 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
1803                 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
1804                 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
1805                         ret = 0;
1806                         break;
1807                 case KVM_S390_VM_CRYPTO_ENABLE_APIE:
1808                 case KVM_S390_VM_CRYPTO_DISABLE_APIE:
1809                         ret = ap_instructions_available() ? 0 : -ENXIO;
1810                         break;
1811                 default:
1812                         ret = -ENXIO;
1813                         break;
1814                 }
1815                 break;
1816         case KVM_S390_VM_MIGRATION:
1817                 ret = 0;
1818                 break;
1819         default:
1820                 ret = -ENXIO;
1821                 break;
1822         }
1823
1824         return ret;
1825 }
1826
1827 static long kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
1828 {
1829         uint8_t *keys;
1830         uint64_t hva;
1831         int srcu_idx, i, r = 0;
1832
1833         if (args->flags != 0)
1834                 return -EINVAL;
1835
1836         /* Is this guest using storage keys? */
1837         if (!mm_uses_skeys(current->mm))
1838                 return KVM_S390_GET_SKEYS_NONE;
1839
1840         /* Enforce sane limit on memory allocation */
1841         if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
1842                 return -EINVAL;
1843
1844         keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL_ACCOUNT);
1845         if (!keys)
1846                 return -ENOMEM;
1847
1848         mmap_read_lock(current->mm);
1849         srcu_idx = srcu_read_lock(&kvm->srcu);
1850         for (i = 0; i < args->count; i++) {
1851                 hva = gfn_to_hva(kvm, args->start_gfn + i);
1852                 if (kvm_is_error_hva(hva)) {
1853                         r = -EFAULT;
1854                         break;
1855                 }
1856
1857                 r = get_guest_storage_key(current->mm, hva, &keys[i]);
1858                 if (r)
1859                         break;
1860         }
1861         srcu_read_unlock(&kvm->srcu, srcu_idx);
1862         mmap_read_unlock(current->mm);
1863
1864         if (!r) {
1865                 r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys,
1866                                  sizeof(uint8_t) * args->count);
1867                 if (r)
1868                         r = -EFAULT;
1869         }
1870
1871         kvfree(keys);
1872         return r;
1873 }
1874
1875 static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
1876 {
1877         uint8_t *keys;
1878         uint64_t hva;
1879         int srcu_idx, i, r = 0;
1880         bool unlocked;
1881
1882         if (args->flags != 0)
1883                 return -EINVAL;
1884
1885         /* Enforce sane limit on memory allocation */
1886         if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
1887                 return -EINVAL;
1888
1889         keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL_ACCOUNT);
1890         if (!keys)
1891                 return -ENOMEM;
1892
1893         r = copy_from_user(keys, (uint8_t __user *)args->skeydata_addr,
1894                            sizeof(uint8_t) * args->count);
1895         if (r) {
1896                 r = -EFAULT;
1897                 goto out;
1898         }
1899
1900         /* Enable storage key handling for the guest */
1901         r = s390_enable_skey();
1902         if (r)
1903                 goto out;
1904
1905         i = 0;
1906         mmap_read_lock(current->mm);
1907         srcu_idx = srcu_read_lock(&kvm->srcu);
1908         while (i < args->count) {
1909                 unlocked = false;
1910                 hva = gfn_to_hva(kvm, args->start_gfn + i);
1911                 if (kvm_is_error_hva(hva)) {
1912                         r = -EFAULT;
1913                         break;
1914                 }
1915
1916                 /* Lowest order bit is reserved */
1917                 if (keys[i] & 0x01) {
1918                         r = -EINVAL;
1919                         break;
1920                 }
1921
1922                 r = set_guest_storage_key(current->mm, hva, keys[i], 0);
1923                 if (r) {
1924                         r = fixup_user_fault(current->mm, hva,
1925                                              FAULT_FLAG_WRITE, &unlocked);
1926                         if (r)
1927                                 break;
1928                 }
1929                 if (!r)
1930                         i++;
1931         }
1932         srcu_read_unlock(&kvm->srcu, srcu_idx);
1933         mmap_read_unlock(current->mm);
1934 out:
1935         kvfree(keys);
1936         return r;
1937 }
1938
1939 /*
1940  * Base address and length must be sent at the start of each block, therefore
1941  * it's cheaper to send some clean data, as long as it's less than the size of
1942  * two longs.
1943  */
1944 #define KVM_S390_MAX_BIT_DISTANCE (2 * sizeof(void *))
1945 /* for consistency */
1946 #define KVM_S390_CMMA_SIZE_MAX ((u32)KVM_S390_SKEYS_MAX)
1947
1948 /*
1949  * Similar to gfn_to_memslot, but returns the index of a memslot also when the
1950  * address falls in a hole. In that case the index of one of the memslots
1951  * bordering the hole is returned.
1952  */
1953 static int gfn_to_memslot_approx(struct kvm_memslots *slots, gfn_t gfn)
1954 {
1955         int start = 0, end = slots->used_slots;
1956         int slot = atomic_read(&slots->lru_slot);
1957         struct kvm_memory_slot *memslots = slots->memslots;
1958
1959         if (gfn >= memslots[slot].base_gfn &&
1960             gfn < memslots[slot].base_gfn + memslots[slot].npages)
1961                 return slot;
1962
1963         while (start < end) {
1964                 slot = start + (end - start) / 2;
1965
1966                 if (gfn >= memslots[slot].base_gfn)
1967                         end = slot;
1968                 else
1969                         start = slot + 1;
1970         }
1971
1972         if (start >= slots->used_slots)
1973                 return slots->used_slots - 1;
1974
1975         if (gfn >= memslots[start].base_gfn &&
1976             gfn < memslots[start].base_gfn + memslots[start].npages) {
1977                 atomic_set(&slots->lru_slot, start);
1978         }
1979
1980         return start;
1981 }
1982
1983 static int kvm_s390_peek_cmma(struct kvm *kvm, struct kvm_s390_cmma_log *args,
1984                               u8 *res, unsigned long bufsize)
1985 {
1986         unsigned long pgstev, hva, cur_gfn = args->start_gfn;
1987
1988         args->count = 0;
1989         while (args->count < bufsize) {
1990                 hva = gfn_to_hva(kvm, cur_gfn);
1991                 /*
1992                  * We return an error if the first value was invalid, but we
1993                  * return successfully if at least one value was copied.
1994                  */
1995                 if (kvm_is_error_hva(hva))
1996                         return args->count ? 0 : -EFAULT;
1997                 if (get_pgste(kvm->mm, hva, &pgstev) < 0)
1998                         pgstev = 0;
1999                 res[args->count++] = (pgstev >> 24) & 0x43;
2000                 cur_gfn++;
2001         }
2002
2003         return 0;
2004 }
2005
2006 static unsigned long kvm_s390_next_dirty_cmma(struct kvm_memslots *slots,
2007                                               unsigned long cur_gfn)
2008 {
2009         int slotidx = gfn_to_memslot_approx(slots, cur_gfn);
2010         struct kvm_memory_slot *ms = slots->memslots + slotidx;
2011         unsigned long ofs = cur_gfn - ms->base_gfn;
2012
2013         if (ms->base_gfn + ms->npages <= cur_gfn) {
2014                 slotidx--;
2015                 /* If we are above the highest slot, wrap around */
2016                 if (slotidx < 0)
2017                         slotidx = slots->used_slots - 1;
2018
2019                 ms = slots->memslots + slotidx;
2020                 ofs = 0;
2021         }
2022         ofs = find_next_bit(kvm_second_dirty_bitmap(ms), ms->npages, ofs);
2023         while ((slotidx > 0) && (ofs >= ms->npages)) {
2024                 slotidx--;
2025                 ms = slots->memslots + slotidx;
2026                 ofs = find_next_bit(kvm_second_dirty_bitmap(ms), ms->npages, 0);
2027         }
2028         return ms->base_gfn + ofs;
2029 }
2030
2031 static int kvm_s390_get_cmma(struct kvm *kvm, struct kvm_s390_cmma_log *args,
2032                              u8 *res, unsigned long bufsize)
2033 {
2034         unsigned long mem_end, cur_gfn, next_gfn, hva, pgstev;
2035         struct kvm_memslots *slots = kvm_memslots(kvm);
2036         struct kvm_memory_slot *ms;
2037
2038         if (unlikely(!slots->used_slots))
2039                 return 0;
2040
2041         cur_gfn = kvm_s390_next_dirty_cmma(slots, args->start_gfn);
2042         ms = gfn_to_memslot(kvm, cur_gfn);
2043         args->count = 0;
2044         args->start_gfn = cur_gfn;
2045         if (!ms)
2046                 return 0;
2047         next_gfn = kvm_s390_next_dirty_cmma(slots, cur_gfn + 1);
2048         mem_end = slots->memslots[0].base_gfn + slots->memslots[0].npages;
2049
2050         while (args->count < bufsize) {
2051                 hva = gfn_to_hva(kvm, cur_gfn);
2052                 if (kvm_is_error_hva(hva))
2053                         return 0;
2054                 /* Decrement only if we actually flipped the bit to 0 */
2055                 if (test_and_clear_bit(cur_gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
2056                         atomic64_dec(&kvm->arch.cmma_dirty_pages);
2057                 if (get_pgste(kvm->mm, hva, &pgstev) < 0)
2058                         pgstev = 0;
2059                 /* Save the value */
2060                 res[args->count++] = (pgstev >> 24) & 0x43;
2061                 /* If the next bit is too far away, stop. */
2062                 if (next_gfn > cur_gfn + KVM_S390_MAX_BIT_DISTANCE)
2063                         return 0;
2064                 /* If we reached the previous "next", find the next one */
2065                 if (cur_gfn == next_gfn)
2066                         next_gfn = kvm_s390_next_dirty_cmma(slots, cur_gfn + 1);
2067                 /* Reached the end of memory or of the buffer, stop */
2068                 if ((next_gfn >= mem_end) ||
2069                     (next_gfn - args->start_gfn >= bufsize))
2070                         return 0;
2071                 cur_gfn++;
2072                 /* Reached the end of the current memslot, take the next one. */
2073                 if (cur_gfn - ms->base_gfn >= ms->npages) {
2074                         ms = gfn_to_memslot(kvm, cur_gfn);
2075                         if (!ms)
2076                                 return 0;
2077                 }
2078         }
2079         return 0;
2080 }
2081
2082 /*
2083  * This function searches for the next page with dirty CMMA attributes, and
2084  * saves the attributes in the buffer up to either the end of the buffer or
2085  * until a block of at least KVM_S390_MAX_BIT_DISTANCE clean bits is found;
2086  * no trailing clean bytes are saved.
2087  * In case no dirty bits were found, or if CMMA was not enabled or used, the
2088  * output buffer will indicate 0 as length.
2089  */
2090 static int kvm_s390_get_cmma_bits(struct kvm *kvm,
2091                                   struct kvm_s390_cmma_log *args)
2092 {
2093         unsigned long bufsize;
2094         int srcu_idx, peek, ret;
2095         u8 *values;
2096
2097         if (!kvm->arch.use_cmma)
2098                 return -ENXIO;
2099         /* Invalid/unsupported flags were specified */
2100         if (args->flags & ~KVM_S390_CMMA_PEEK)
2101                 return -EINVAL;
2102         /* Migration mode query, and we are not doing a migration */
2103         peek = !!(args->flags & KVM_S390_CMMA_PEEK);
2104         if (!peek && !kvm->arch.migration_mode)
2105                 return -EINVAL;
2106         /* CMMA is disabled or was not used, or the buffer has length zero */
2107         bufsize = min(args->count, KVM_S390_CMMA_SIZE_MAX);
2108         if (!bufsize || !kvm->mm->context.uses_cmm) {
2109                 memset(args, 0, sizeof(*args));
2110                 return 0;
2111         }
2112         /* We are not peeking, and there are no dirty pages */
2113         if (!peek && !atomic64_read(&kvm->arch.cmma_dirty_pages)) {
2114                 memset(args, 0, sizeof(*args));
2115                 return 0;
2116         }
2117
2118         values = vmalloc(bufsize);
2119         if (!values)
2120                 return -ENOMEM;
2121
2122         mmap_read_lock(kvm->mm);
2123         srcu_idx = srcu_read_lock(&kvm->srcu);
2124         if (peek)
2125                 ret = kvm_s390_peek_cmma(kvm, args, values, bufsize);
2126         else
2127                 ret = kvm_s390_get_cmma(kvm, args, values, bufsize);
2128         srcu_read_unlock(&kvm->srcu, srcu_idx);
2129         mmap_read_unlock(kvm->mm);
2130
2131         if (kvm->arch.migration_mode)
2132                 args->remaining = atomic64_read(&kvm->arch.cmma_dirty_pages);
2133         else
2134                 args->remaining = 0;
2135
2136         if (copy_to_user((void __user *)args->values, values, args->count))
2137                 ret = -EFAULT;
2138
2139         vfree(values);
2140         return ret;
2141 }
2142
2143 /*
2144  * This function sets the CMMA attributes for the given pages. If the input
2145  * buffer has zero length, no action is taken, otherwise the attributes are
2146  * set and the mm->context.uses_cmm flag is set.
2147  */
2148 static int kvm_s390_set_cmma_bits(struct kvm *kvm,
2149                                   const struct kvm_s390_cmma_log *args)
2150 {
2151         unsigned long hva, mask, pgstev, i;
2152         uint8_t *bits;
2153         int srcu_idx, r = 0;
2154
2155         mask = args->mask;
2156
2157         if (!kvm->arch.use_cmma)
2158                 return -ENXIO;
2159         /* invalid/unsupported flags */
2160         if (args->flags != 0)
2161                 return -EINVAL;
2162         /* Enforce sane limit on memory allocation */
2163         if (args->count > KVM_S390_CMMA_SIZE_MAX)
2164                 return -EINVAL;
2165         /* Nothing to do */
2166         if (args->count == 0)
2167                 return 0;
2168
2169         bits = vmalloc(array_size(sizeof(*bits), args->count));
2170         if (!bits)
2171                 return -ENOMEM;
2172
2173         r = copy_from_user(bits, (void __user *)args->values, args->count);
2174         if (r) {
2175                 r = -EFAULT;
2176                 goto out;
2177         }
2178
2179         mmap_read_lock(kvm->mm);
2180         srcu_idx = srcu_read_lock(&kvm->srcu);
2181         for (i = 0; i < args->count; i++) {
2182                 hva = gfn_to_hva(kvm, args->start_gfn + i);
2183                 if (kvm_is_error_hva(hva)) {
2184                         r = -EFAULT;
2185                         break;
2186                 }
2187
2188                 pgstev = bits[i];
2189                 pgstev = pgstev << 24;
2190                 mask &= _PGSTE_GPS_USAGE_MASK | _PGSTE_GPS_NODAT;
2191                 set_pgste_bits(kvm->mm, hva, mask, pgstev);
2192         }
2193         srcu_read_unlock(&kvm->srcu, srcu_idx);
2194         mmap_read_unlock(kvm->mm);
2195
2196         if (!kvm->mm->context.uses_cmm) {
2197                 mmap_write_lock(kvm->mm);
2198                 kvm->mm->context.uses_cmm = 1;
2199                 mmap_write_unlock(kvm->mm);
2200         }
2201 out:
2202         vfree(bits);
2203         return r;
2204 }
2205
2206 static int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rcp, u16 *rrcp)
2207 {
2208         struct kvm_vcpu *vcpu;
2209         u16 rc, rrc;
2210         int ret = 0;
2211         int i;
2212
2213         /*
2214          * We ignore failures and try to destroy as many CPUs as possible.
2215          * At the same time we must not free the assigned resources when
2216          * this fails, as the ultravisor has still access to that memory.
2217          * So kvm_s390_pv_destroy_cpu can leave a "wanted" memory leak
2218          * behind.
2219          * We want to return the first failure rc and rrc, though.
2220          */
2221         kvm_for_each_vcpu(i, vcpu, kvm) {
2222                 mutex_lock(&vcpu->mutex);
2223                 if (kvm_s390_pv_destroy_cpu(vcpu, &rc, &rrc) && !ret) {
2224                         *rcp = rc;
2225                         *rrcp = rrc;
2226                         ret = -EIO;
2227                 }
2228                 mutex_unlock(&vcpu->mutex);
2229         }
2230         return ret;
2231 }
2232
2233 static int kvm_s390_cpus_to_pv(struct kvm *kvm, u16 *rc, u16 *rrc)
2234 {
2235         int i, r = 0;
2236         u16 dummy;
2237
2238         struct kvm_vcpu *vcpu;
2239
2240         kvm_for_each_vcpu(i, vcpu, kvm) {
2241                 mutex_lock(&vcpu->mutex);
2242                 r = kvm_s390_pv_create_cpu(vcpu, rc, rrc);
2243                 mutex_unlock(&vcpu->mutex);
2244                 if (r)
2245                         break;
2246         }
2247         if (r)
2248                 kvm_s390_cpus_from_pv(kvm, &dummy, &dummy);
2249         return r;
2250 }
2251
2252 static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd)
2253 {
2254         int r = 0;
2255         u16 dummy;
2256         void __user *argp = (void __user *)cmd->data;
2257
2258         switch (cmd->cmd) {
2259         case KVM_PV_ENABLE: {
2260                 r = -EINVAL;
2261                 if (kvm_s390_pv_is_protected(kvm))
2262                         break;
2263
2264                 /*
2265                  *  FMT 4 SIE needs esca. As we never switch back to bsca from
2266                  *  esca, we need no cleanup in the error cases below
2267                  */
2268                 r = sca_switch_to_extended(kvm);
2269                 if (r)
2270                         break;
2271
2272                 mmap_write_lock(current->mm);
2273                 r = gmap_mark_unmergeable();
2274                 mmap_write_unlock(current->mm);
2275                 if (r)
2276                         break;
2277
2278                 r = kvm_s390_pv_init_vm(kvm, &cmd->rc, &cmd->rrc);
2279                 if (r)
2280                         break;
2281
2282                 r = kvm_s390_cpus_to_pv(kvm, &cmd->rc, &cmd->rrc);
2283                 if (r)
2284                         kvm_s390_pv_deinit_vm(kvm, &dummy, &dummy);
2285
2286                 /* we need to block service interrupts from now on */
2287                 set_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs);
2288                 break;
2289         }
2290         case KVM_PV_DISABLE: {
2291                 r = -EINVAL;
2292                 if (!kvm_s390_pv_is_protected(kvm))
2293                         break;
2294
2295                 r = kvm_s390_cpus_from_pv(kvm, &cmd->rc, &cmd->rrc);
2296                 /*
2297                  * If a CPU could not be destroyed, destroy VM will also fail.
2298                  * There is no point in trying to destroy it. Instead return
2299                  * the rc and rrc from the first CPU that failed destroying.
2300                  */
2301                 if (r)
2302                         break;
2303                 r = kvm_s390_pv_deinit_vm(kvm, &cmd->rc, &cmd->rrc);
2304
2305                 /* no need to block service interrupts any more */
2306                 clear_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs);
2307                 break;
2308         }
2309         case KVM_PV_SET_SEC_PARMS: {
2310                 struct kvm_s390_pv_sec_parm parms = {};
2311                 void *hdr;
2312
2313                 r = -EINVAL;
2314                 if (!kvm_s390_pv_is_protected(kvm))
2315                         break;
2316
2317                 r = -EFAULT;
2318                 if (copy_from_user(&parms, argp, sizeof(parms)))
2319                         break;
2320
2321                 /* Currently restricted to 8KB */
2322                 r = -EINVAL;
2323                 if (parms.length > PAGE_SIZE * 2)
2324                         break;
2325
2326                 r = -ENOMEM;
2327                 hdr = vmalloc(parms.length);
2328                 if (!hdr)
2329                         break;
2330
2331                 r = -EFAULT;
2332                 if (!copy_from_user(hdr, (void __user *)parms.origin,
2333                                     parms.length))
2334                         r = kvm_s390_pv_set_sec_parms(kvm, hdr, parms.length,
2335                                                       &cmd->rc, &cmd->rrc);
2336
2337                 vfree(hdr);
2338                 break;
2339         }
2340         case KVM_PV_UNPACK: {
2341                 struct kvm_s390_pv_unp unp = {};
2342
2343                 r = -EINVAL;
2344                 if (!kvm_s390_pv_is_protected(kvm) || !mm_is_protected(kvm->mm))
2345                         break;
2346
2347                 r = -EFAULT;
2348                 if (copy_from_user(&unp, argp, sizeof(unp)))
2349                         break;
2350
2351                 r = kvm_s390_pv_unpack(kvm, unp.addr, unp.size, unp.tweak,
2352                                        &cmd->rc, &cmd->rrc);
2353                 break;
2354         }
2355         case KVM_PV_VERIFY: {
2356                 r = -EINVAL;
2357                 if (!kvm_s390_pv_is_protected(kvm))
2358                         break;
2359
2360                 r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
2361                                   UVC_CMD_VERIFY_IMG, &cmd->rc, &cmd->rrc);
2362                 KVM_UV_EVENT(kvm, 3, "PROTVIRT VERIFY: rc %x rrc %x", cmd->rc,
2363                              cmd->rrc);
2364                 break;
2365         }
2366         case KVM_PV_PREP_RESET: {
2367                 r = -EINVAL;
2368                 if (!kvm_s390_pv_is_protected(kvm))
2369                         break;
2370
2371                 r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
2372                                   UVC_CMD_PREPARE_RESET, &cmd->rc, &cmd->rrc);
2373                 KVM_UV_EVENT(kvm, 3, "PROTVIRT PREP RESET: rc %x rrc %x",
2374                              cmd->rc, cmd->rrc);
2375                 break;
2376         }
2377         case KVM_PV_UNSHARE_ALL: {
2378                 r = -EINVAL;
2379                 if (!kvm_s390_pv_is_protected(kvm))
2380                         break;
2381
2382                 r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
2383                                   UVC_CMD_SET_UNSHARE_ALL, &cmd->rc, &cmd->rrc);
2384                 KVM_UV_EVENT(kvm, 3, "PROTVIRT UNSHARE: rc %x rrc %x",
2385                              cmd->rc, cmd->rrc);
2386                 break;
2387         }
2388         default:
2389                 r = -ENOTTY;
2390         }
2391         return r;
2392 }
2393
2394 long kvm_arch_vm_ioctl(struct file *filp,
2395                        unsigned int ioctl, unsigned long arg)
2396 {
2397         struct kvm *kvm = filp->private_data;
2398         void __user *argp = (void __user *)arg;
2399         struct kvm_device_attr attr;
2400         int r;
2401
2402         switch (ioctl) {
2403         case KVM_S390_INTERRUPT: {
2404                 struct kvm_s390_interrupt s390int;
2405
2406                 r = -EFAULT;
2407                 if (copy_from_user(&s390int, argp, sizeof(s390int)))
2408                         break;
2409                 r = kvm_s390_inject_vm(kvm, &s390int);
2410                 break;
2411         }
2412         case KVM_CREATE_IRQCHIP: {
2413                 struct kvm_irq_routing_entry routing;
2414
2415                 r = -EINVAL;
2416                 if (kvm->arch.use_irqchip) {
2417                         /* Set up dummy routing. */
2418                         memset(&routing, 0, sizeof(routing));
2419                         r = kvm_set_irq_routing(kvm, &routing, 0, 0);
2420                 }
2421                 break;
2422         }
2423         case KVM_SET_DEVICE_ATTR: {
2424                 r = -EFAULT;
2425                 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2426                         break;
2427                 r = kvm_s390_vm_set_attr(kvm, &attr);
2428                 break;
2429         }
2430         case KVM_GET_DEVICE_ATTR: {
2431                 r = -EFAULT;
2432                 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2433                         break;
2434                 r = kvm_s390_vm_get_attr(kvm, &attr);
2435                 break;
2436         }
2437         case KVM_HAS_DEVICE_ATTR: {
2438                 r = -EFAULT;
2439                 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2440                         break;
2441                 r = kvm_s390_vm_has_attr(kvm, &attr);
2442                 break;
2443         }
2444         case KVM_S390_GET_SKEYS: {
2445                 struct kvm_s390_skeys args;
2446
2447                 r = -EFAULT;
2448                 if (copy_from_user(&args, argp,
2449                                    sizeof(struct kvm_s390_skeys)))
2450                         break;
2451                 r = kvm_s390_get_skeys(kvm, &args);
2452                 break;
2453         }
2454         case KVM_S390_SET_SKEYS: {
2455                 struct kvm_s390_skeys args;
2456
2457                 r = -EFAULT;
2458                 if (copy_from_user(&args, argp,
2459                                    sizeof(struct kvm_s390_skeys)))
2460                         break;
2461                 r = kvm_s390_set_skeys(kvm, &args);
2462                 break;
2463         }
2464         case KVM_S390_GET_CMMA_BITS: {
2465                 struct kvm_s390_cmma_log args;
2466
2467                 r = -EFAULT;
2468                 if (copy_from_user(&args, argp, sizeof(args)))
2469                         break;
2470                 mutex_lock(&kvm->slots_lock);
2471                 r = kvm_s390_get_cmma_bits(kvm, &args);
2472                 mutex_unlock(&kvm->slots_lock);
2473                 if (!r) {
2474                         r = copy_to_user(argp, &args, sizeof(args));
2475                         if (r)
2476                                 r = -EFAULT;
2477                 }
2478                 break;
2479         }
2480         case KVM_S390_SET_CMMA_BITS: {
2481                 struct kvm_s390_cmma_log args;
2482
2483                 r = -EFAULT;
2484                 if (copy_from_user(&args, argp, sizeof(args)))
2485                         break;
2486                 mutex_lock(&kvm->slots_lock);
2487                 r = kvm_s390_set_cmma_bits(kvm, &args);
2488                 mutex_unlock(&kvm->slots_lock);
2489                 break;
2490         }
2491         case KVM_S390_PV_COMMAND: {
2492                 struct kvm_pv_cmd args;
2493
2494                 /* protvirt means user sigp */
2495                 kvm->arch.user_cpu_state_ctrl = 1;
2496                 r = 0;
2497                 if (!is_prot_virt_host()) {
2498                         r = -EINVAL;
2499                         break;
2500                 }
2501                 if (copy_from_user(&args, argp, sizeof(args))) {
2502                         r = -EFAULT;
2503                         break;
2504                 }
2505                 if (args.flags) {
2506                         r = -EINVAL;
2507                         break;
2508                 }
2509                 mutex_lock(&kvm->lock);
2510                 r = kvm_s390_handle_pv(kvm, &args);
2511                 mutex_unlock(&kvm->lock);
2512                 if (copy_to_user(argp, &args, sizeof(args))) {
2513                         r = -EFAULT;
2514                         break;
2515                 }
2516                 break;
2517         }
2518         default:
2519                 r = -ENOTTY;
2520         }
2521
2522         return r;
2523 }
2524
2525 static int kvm_s390_apxa_installed(void)
2526 {
2527         struct ap_config_info info;
2528
2529         if (ap_instructions_available()) {
2530                 if (ap_qci(&info) == 0)
2531                         return info.apxa;
2532         }
2533
2534         return 0;
2535 }
2536
2537 /*
2538  * The format of the crypto control block (CRYCB) is specified in the 3 low
2539  * order bits of the CRYCB designation (CRYCBD) field as follows:
2540  * Format 0: Neither the message security assist extension 3 (MSAX3) nor the
2541  *           AP extended addressing (APXA) facility are installed.
2542  * Format 1: The APXA facility is not installed but the MSAX3 facility is.
2543  * Format 2: Both the APXA and MSAX3 facilities are installed
2544  */
2545 static void kvm_s390_set_crycb_format(struct kvm *kvm)
2546 {
2547         kvm->arch.crypto.crycbd = (__u32)(unsigned long) kvm->arch.crypto.crycb;
2548
2549         /* Clear the CRYCB format bits - i.e., set format 0 by default */
2550         kvm->arch.crypto.crycbd &= ~(CRYCB_FORMAT_MASK);
2551
2552         /* Check whether MSAX3 is installed */
2553         if (!test_kvm_facility(kvm, 76))
2554                 return;
2555
2556         if (kvm_s390_apxa_installed())
2557                 kvm->arch.crypto.crycbd |= CRYCB_FORMAT2;
2558         else
2559                 kvm->arch.crypto.crycbd |= CRYCB_FORMAT1;
2560 }
2561
2562 void kvm_arch_crypto_set_masks(struct kvm *kvm, unsigned long *apm,
2563                                unsigned long *aqm, unsigned long *adm)
2564 {
2565         struct kvm_s390_crypto_cb *crycb = kvm->arch.crypto.crycb;
2566
2567         mutex_lock(&kvm->lock);
2568         kvm_s390_vcpu_block_all(kvm);
2569
2570         switch (kvm->arch.crypto.crycbd & CRYCB_FORMAT_MASK) {
2571         case CRYCB_FORMAT2: /* APCB1 use 256 bits */
2572                 memcpy(crycb->apcb1.apm, apm, 32);
2573                 VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx %016lx %016lx %016lx",
2574                          apm[0], apm[1], apm[2], apm[3]);
2575                 memcpy(crycb->apcb1.aqm, aqm, 32);
2576                 VM_EVENT(kvm, 3, "SET CRYCB: aqm %016lx %016lx %016lx %016lx",
2577                          aqm[0], aqm[1], aqm[2], aqm[3]);
2578                 memcpy(crycb->apcb1.adm, adm, 32);
2579                 VM_EVENT(kvm, 3, "SET CRYCB: adm %016lx %016lx %016lx %016lx",
2580                          adm[0], adm[1], adm[2], adm[3]);
2581                 break;
2582         case CRYCB_FORMAT1:
2583         case CRYCB_FORMAT0: /* Fall through both use APCB0 */
2584                 memcpy(crycb->apcb0.apm, apm, 8);
2585                 memcpy(crycb->apcb0.aqm, aqm, 2);
2586                 memcpy(crycb->apcb0.adm, adm, 2);
2587                 VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx aqm %04x adm %04x",
2588                          apm[0], *((unsigned short *)aqm),
2589                          *((unsigned short *)adm));
2590                 break;
2591         default:        /* Can not happen */
2592                 break;
2593         }
2594
2595         /* recreate the shadow crycb for each vcpu */
2596         kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART);
2597         kvm_s390_vcpu_unblock_all(kvm);
2598         mutex_unlock(&kvm->lock);
2599 }
2600 EXPORT_SYMBOL_GPL(kvm_arch_crypto_set_masks);
2601
2602 void kvm_arch_crypto_clear_masks(struct kvm *kvm)
2603 {
2604         mutex_lock(&kvm->lock);
2605         kvm_s390_vcpu_block_all(kvm);
2606
2607         memset(&kvm->arch.crypto.crycb->apcb0, 0,
2608                sizeof(kvm->arch.crypto.crycb->apcb0));
2609         memset(&kvm->arch.crypto.crycb->apcb1, 0,
2610                sizeof(kvm->arch.crypto.crycb->apcb1));
2611
2612         VM_EVENT(kvm, 3, "%s", "CLR CRYCB:");
2613         /* recreate the shadow crycb for each vcpu */
2614         kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART);
2615         kvm_s390_vcpu_unblock_all(kvm);
2616         mutex_unlock(&kvm->lock);
2617 }
2618 EXPORT_SYMBOL_GPL(kvm_arch_crypto_clear_masks);
2619
2620 static u64 kvm_s390_get_initial_cpuid(void)
2621 {
2622         struct cpuid cpuid;
2623
2624         get_cpu_id(&cpuid);
2625         cpuid.version = 0xff;
2626         return *((u64 *) &cpuid);
2627 }
2628
2629 static void kvm_s390_crypto_init(struct kvm *kvm)
2630 {
2631         kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb;
2632         kvm_s390_set_crycb_format(kvm);
2633
2634         if (!test_kvm_facility(kvm, 76))
2635                 return;
2636
2637         /* Enable AES/DEA protected key functions by default */
2638         kvm->arch.crypto.aes_kw = 1;
2639         kvm->arch.crypto.dea_kw = 1;
2640         get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask,
2641                          sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
2642         get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask,
2643                          sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
2644 }
2645
2646 static void sca_dispose(struct kvm *kvm)
2647 {
2648         if (kvm->arch.use_esca)
2649                 free_pages_exact(kvm->arch.sca, sizeof(struct esca_block));
2650         else
2651                 free_page((unsigned long)(kvm->arch.sca));
2652         kvm->arch.sca = NULL;
2653 }
2654
2655 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
2656 {
2657         gfp_t alloc_flags = GFP_KERNEL_ACCOUNT;
2658         int i, rc;
2659         char debug_name[16];
2660         static unsigned long sca_offset;
2661
2662         rc = -EINVAL;
2663 #ifdef CONFIG_KVM_S390_UCONTROL
2664         if (type & ~KVM_VM_S390_UCONTROL)
2665                 goto out_err;
2666         if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN)))
2667                 goto out_err;
2668 #else
2669         if (type)
2670                 goto out_err;
2671 #endif
2672
2673         rc = s390_enable_sie();
2674         if (rc)
2675                 goto out_err;
2676
2677         rc = -ENOMEM;
2678
2679         if (!sclp.has_64bscao)
2680                 alloc_flags |= GFP_DMA;
2681         rwlock_init(&kvm->arch.sca_lock);
2682         /* start with basic SCA */
2683         kvm->arch.sca = (struct bsca_block *) get_zeroed_page(alloc_flags);
2684         if (!kvm->arch.sca)
2685                 goto out_err;
2686         mutex_lock(&kvm_lock);
2687         sca_offset += 16;
2688         if (sca_offset + sizeof(struct bsca_block) > PAGE_SIZE)
2689                 sca_offset = 0;
2690         kvm->arch.sca = (struct bsca_block *)
2691                         ((char *) kvm->arch.sca + sca_offset);
2692         mutex_unlock(&kvm_lock);
2693
2694         sprintf(debug_name, "kvm-%u", current->pid);
2695
2696         kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long));
2697         if (!kvm->arch.dbf)
2698                 goto out_err;
2699
2700         BUILD_BUG_ON(sizeof(struct sie_page2) != 4096);
2701         kvm->arch.sie_page2 =
2702              (struct sie_page2 *) get_zeroed_page(GFP_KERNEL_ACCOUNT | GFP_DMA);
2703         if (!kvm->arch.sie_page2)
2704                 goto out_err;
2705
2706         kvm->arch.sie_page2->kvm = kvm;
2707         kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list;
2708
2709         for (i = 0; i < kvm_s390_fac_size(); i++) {
2710                 kvm->arch.model.fac_mask[i] = stfle_fac_list[i] &
2711                                               (kvm_s390_fac_base[i] |
2712                                                kvm_s390_fac_ext[i]);
2713                 kvm->arch.model.fac_list[i] = stfle_fac_list[i] &
2714                                               kvm_s390_fac_base[i];
2715         }
2716         kvm->arch.model.subfuncs = kvm_s390_available_subfunc;
2717
2718         /* we are always in czam mode - even on pre z14 machines */
2719         set_kvm_facility(kvm->arch.model.fac_mask, 138);
2720         set_kvm_facility(kvm->arch.model.fac_list, 138);
2721         /* we emulate STHYI in kvm */
2722         set_kvm_facility(kvm->arch.model.fac_mask, 74);
2723         set_kvm_facility(kvm->arch.model.fac_list, 74);
2724         if (MACHINE_HAS_TLB_GUEST) {
2725                 set_kvm_facility(kvm->arch.model.fac_mask, 147);
2726                 set_kvm_facility(kvm->arch.model.fac_list, 147);
2727         }
2728
2729         if (css_general_characteristics.aiv && test_facility(65))
2730                 set_kvm_facility(kvm->arch.model.fac_mask, 65);
2731
2732         kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid();
2733         kvm->arch.model.ibc = sclp.ibc & 0x0fff;
2734
2735         kvm_s390_crypto_init(kvm);
2736
2737         mutex_init(&kvm->arch.float_int.ais_lock);
2738         spin_lock_init(&kvm->arch.float_int.lock);
2739         for (i = 0; i < FIRQ_LIST_COUNT; i++)
2740                 INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]);
2741         init_waitqueue_head(&kvm->arch.ipte_wq);
2742         mutex_init(&kvm->arch.ipte_mutex);
2743
2744         debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
2745         VM_EVENT(kvm, 3, "vm created with type %lu", type);
2746
2747         if (type & KVM_VM_S390_UCONTROL) {
2748                 kvm->arch.gmap = NULL;
2749                 kvm->arch.mem_limit = KVM_S390_NO_MEM_LIMIT;
2750         } else {
2751                 if (sclp.hamax == U64_MAX)
2752                         kvm->arch.mem_limit = TASK_SIZE_MAX;
2753                 else
2754                         kvm->arch.mem_limit = min_t(unsigned long, TASK_SIZE_MAX,
2755                                                     sclp.hamax + 1);
2756                 kvm->arch.gmap = gmap_create(current->mm, kvm->arch.mem_limit - 1);
2757                 if (!kvm->arch.gmap)
2758                         goto out_err;
2759                 kvm->arch.gmap->private = kvm;
2760                 kvm->arch.gmap->pfault_enabled = 0;
2761         }
2762
2763         kvm->arch.use_pfmfi = sclp.has_pfmfi;
2764         kvm->arch.use_skf = sclp.has_skey;
2765         spin_lock_init(&kvm->arch.start_stop_lock);
2766         kvm_s390_vsie_init(kvm);
2767         if (use_gisa)
2768                 kvm_s390_gisa_init(kvm);
2769         KVM_EVENT(3, "vm 0x%pK created by pid %u", kvm, current->pid);
2770
2771         return 0;
2772 out_err:
2773         free_page((unsigned long)kvm->arch.sie_page2);
2774         debug_unregister(kvm->arch.dbf);
2775         sca_dispose(kvm);
2776         KVM_EVENT(3, "creation of vm failed: %d", rc);
2777         return rc;
2778 }
2779
2780 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
2781 {
2782         u16 rc, rrc;
2783
2784         VCPU_EVENT(vcpu, 3, "%s", "free cpu");
2785         trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
2786         kvm_s390_clear_local_irqs(vcpu);
2787         kvm_clear_async_pf_completion_queue(vcpu);
2788         if (!kvm_is_ucontrol(vcpu->kvm))
2789                 sca_del_vcpu(vcpu);
2790
2791         if (kvm_is_ucontrol(vcpu->kvm))
2792                 gmap_remove(vcpu->arch.gmap);
2793
2794         if (vcpu->kvm->arch.use_cmma)
2795                 kvm_s390_vcpu_unsetup_cmma(vcpu);
2796         /* We can not hold the vcpu mutex here, we are already dying */
2797         if (kvm_s390_pv_cpu_get_handle(vcpu))
2798                 kvm_s390_pv_destroy_cpu(vcpu, &rc, &rrc);
2799         free_page((unsigned long)(vcpu->arch.sie_block));
2800 }
2801
2802 static void kvm_free_vcpus(struct kvm *kvm)
2803 {
2804         unsigned int i;
2805         struct kvm_vcpu *vcpu;
2806
2807         kvm_for_each_vcpu(i, vcpu, kvm)
2808                 kvm_vcpu_destroy(vcpu);
2809
2810         mutex_lock(&kvm->lock);
2811         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
2812                 kvm->vcpus[i] = NULL;
2813
2814         atomic_set(&kvm->online_vcpus, 0);
2815         mutex_unlock(&kvm->lock);
2816 }
2817
2818 void kvm_arch_destroy_vm(struct kvm *kvm)
2819 {
2820         u16 rc, rrc;
2821
2822         kvm_free_vcpus(kvm);
2823         sca_dispose(kvm);
2824         kvm_s390_gisa_destroy(kvm);
2825         /*
2826          * We are already at the end of life and kvm->lock is not taken.
2827          * This is ok as the file descriptor is closed by now and nobody
2828          * can mess with the pv state. To avoid lockdep_assert_held from
2829          * complaining we do not use kvm_s390_pv_is_protected.
2830          */
2831         if (kvm_s390_pv_get_handle(kvm))
2832                 kvm_s390_pv_deinit_vm(kvm, &rc, &rrc);
2833         debug_unregister(kvm->arch.dbf);
2834         free_page((unsigned long)kvm->arch.sie_page2);
2835         if (!kvm_is_ucontrol(kvm))
2836                 gmap_remove(kvm->arch.gmap);
2837         kvm_s390_destroy_adapters(kvm);
2838         kvm_s390_clear_float_irqs(kvm);
2839         kvm_s390_vsie_destroy(kvm);
2840         KVM_EVENT(3, "vm 0x%pK destroyed", kvm);
2841 }
2842
2843 /* Section: vcpu related */
2844 static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu)
2845 {
2846         vcpu->arch.gmap = gmap_create(current->mm, -1UL);
2847         if (!vcpu->arch.gmap)
2848                 return -ENOMEM;
2849         vcpu->arch.gmap->private = vcpu->kvm;
2850
2851         return 0;
2852 }
2853
2854 static void sca_del_vcpu(struct kvm_vcpu *vcpu)
2855 {
2856         if (!kvm_s390_use_sca_entries())
2857                 return;
2858         read_lock(&vcpu->kvm->arch.sca_lock);
2859         if (vcpu->kvm->arch.use_esca) {
2860                 struct esca_block *sca = vcpu->kvm->arch.sca;
2861
2862                 clear_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
2863                 sca->cpu[vcpu->vcpu_id].sda = 0;
2864         } else {
2865                 struct bsca_block *sca = vcpu->kvm->arch.sca;
2866
2867                 clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
2868                 sca->cpu[vcpu->vcpu_id].sda = 0;
2869         }
2870         read_unlock(&vcpu->kvm->arch.sca_lock);
2871 }
2872
2873 static void sca_add_vcpu(struct kvm_vcpu *vcpu)
2874 {
2875         if (!kvm_s390_use_sca_entries()) {
2876                 struct bsca_block *sca = vcpu->kvm->arch.sca;
2877
2878                 /* we still need the basic sca for the ipte control */
2879                 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
2880                 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
2881                 return;
2882         }
2883         read_lock(&vcpu->kvm->arch.sca_lock);
2884         if (vcpu->kvm->arch.use_esca) {
2885                 struct esca_block *sca = vcpu->kvm->arch.sca;
2886
2887                 sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
2888                 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
2889                 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca & ~0x3fU;
2890                 vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
2891                 set_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
2892         } else {
2893                 struct bsca_block *sca = vcpu->kvm->arch.sca;
2894
2895                 sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
2896                 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
2897                 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
2898                 set_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
2899         }
2900         read_unlock(&vcpu->kvm->arch.sca_lock);
2901 }
2902
2903 /* Basic SCA to Extended SCA data copy routines */
2904 static inline void sca_copy_entry(struct esca_entry *d, struct bsca_entry *s)
2905 {
2906         d->sda = s->sda;
2907         d->sigp_ctrl.c = s->sigp_ctrl.c;
2908         d->sigp_ctrl.scn = s->sigp_ctrl.scn;
2909 }
2910
2911 static void sca_copy_b_to_e(struct esca_block *d, struct bsca_block *s)
2912 {
2913         int i;
2914
2915         d->ipte_control = s->ipte_control;
2916         d->mcn[0] = s->mcn;
2917         for (i = 0; i < KVM_S390_BSCA_CPU_SLOTS; i++)
2918                 sca_copy_entry(&d->cpu[i], &s->cpu[i]);
2919 }
2920
2921 static int sca_switch_to_extended(struct kvm *kvm)
2922 {
2923         struct bsca_block *old_sca = kvm->arch.sca;
2924         struct esca_block *new_sca;
2925         struct kvm_vcpu *vcpu;
2926         unsigned int vcpu_idx;
2927         u32 scaol, scaoh;
2928
2929         if (kvm->arch.use_esca)
2930                 return 0;
2931
2932         new_sca = alloc_pages_exact(sizeof(*new_sca), GFP_KERNEL_ACCOUNT | __GFP_ZERO);
2933         if (!new_sca)
2934                 return -ENOMEM;
2935
2936         scaoh = (u32)((u64)(new_sca) >> 32);
2937         scaol = (u32)(u64)(new_sca) & ~0x3fU;
2938
2939         kvm_s390_vcpu_block_all(kvm);
2940         write_lock(&kvm->arch.sca_lock);
2941
2942         sca_copy_b_to_e(new_sca, old_sca);
2943
2944         kvm_for_each_vcpu(vcpu_idx, vcpu, kvm) {
2945                 vcpu->arch.sie_block->scaoh = scaoh;
2946                 vcpu->arch.sie_block->scaol = scaol;
2947                 vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
2948         }
2949         kvm->arch.sca = new_sca;
2950         kvm->arch.use_esca = 1;
2951
2952         write_unlock(&kvm->arch.sca_lock);
2953         kvm_s390_vcpu_unblock_all(kvm);
2954
2955         free_page((unsigned long)old_sca);
2956
2957         VM_EVENT(kvm, 2, "Switched to ESCA (0x%pK -> 0x%pK)",
2958                  old_sca, kvm->arch.sca);
2959         return 0;
2960 }
2961
2962 static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)
2963 {
2964         int rc;
2965
2966         if (!kvm_s390_use_sca_entries()) {
2967                 if (id < KVM_MAX_VCPUS)
2968                         return true;
2969                 return false;
2970         }
2971         if (id < KVM_S390_BSCA_CPU_SLOTS)
2972                 return true;
2973         if (!sclp.has_esca || !sclp.has_64bscao)
2974                 return false;
2975
2976         mutex_lock(&kvm->lock);
2977         rc = kvm->arch.use_esca ? 0 : sca_switch_to_extended(kvm);
2978         mutex_unlock(&kvm->lock);
2979
2980         return rc == 0 && id < KVM_S390_ESCA_CPU_SLOTS;
2981 }
2982
2983 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2984 static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2985 {
2986         WARN_ON_ONCE(vcpu->arch.cputm_start != 0);
2987         raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2988         vcpu->arch.cputm_start = get_tod_clock_fast();
2989         raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2990 }
2991
2992 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2993 static void __stop_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2994 {
2995         WARN_ON_ONCE(vcpu->arch.cputm_start == 0);
2996         raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2997         vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start;
2998         vcpu->arch.cputm_start = 0;
2999         raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
3000 }
3001
3002 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
3003 static void __enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
3004 {
3005         WARN_ON_ONCE(vcpu->arch.cputm_enabled);
3006         vcpu->arch.cputm_enabled = true;
3007         __start_cpu_timer_accounting(vcpu);
3008 }
3009
3010 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
3011 static void __disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
3012 {
3013         WARN_ON_ONCE(!vcpu->arch.cputm_enabled);
3014         __stop_cpu_timer_accounting(vcpu);
3015         vcpu->arch.cputm_enabled = false;
3016 }
3017
3018 static void enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
3019 {
3020         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
3021         __enable_cpu_timer_accounting(vcpu);
3022         preempt_enable();
3023 }
3024
3025 static void disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
3026 {
3027         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
3028         __disable_cpu_timer_accounting(vcpu);
3029         preempt_enable();
3030 }
3031
3032 /* set the cpu timer - may only be called from the VCPU thread itself */
3033 void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm)
3034 {
3035         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
3036         raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
3037         if (vcpu->arch.cputm_enabled)
3038                 vcpu->arch.cputm_start = get_tod_clock_fast();
3039         vcpu->arch.sie_block->cputm = cputm;
3040         raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
3041         preempt_enable();
3042 }
3043
3044 /* update and get the cpu timer - can also be called from other VCPU threads */
3045 __u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu)
3046 {
3047         unsigned int seq;
3048         __u64 value;
3049
3050         if (unlikely(!vcpu->arch.cputm_enabled))
3051                 return vcpu->arch.sie_block->cputm;
3052
3053         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
3054         do {
3055                 seq = raw_read_seqcount(&vcpu->arch.cputm_seqcount);
3056                 /*
3057                  * If the writer would ever execute a read in the critical
3058                  * section, e.g. in irq context, we have a deadlock.
3059                  */
3060                 WARN_ON_ONCE((seq & 1) && smp_processor_id() == vcpu->cpu);
3061                 value = vcpu->arch.sie_block->cputm;
3062                 /* if cputm_start is 0, accounting is being started/stopped */
3063                 if (likely(vcpu->arch.cputm_start))
3064                         value -= get_tod_clock_fast() - vcpu->arch.cputm_start;
3065         } while (read_seqcount_retry(&vcpu->arch.cputm_seqcount, seq & ~1));
3066         preempt_enable();
3067         return value;
3068 }
3069
3070 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
3071 {
3072
3073         gmap_enable(vcpu->arch.enabled_gmap);
3074         kvm_s390_set_cpuflags(vcpu, CPUSTAT_RUNNING);
3075         if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
3076                 __start_cpu_timer_accounting(vcpu);
3077         vcpu->cpu = cpu;
3078 }
3079
3080 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
3081 {
3082         vcpu->cpu = -1;
3083         if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
3084                 __stop_cpu_timer_accounting(vcpu);
3085         kvm_s390_clear_cpuflags(vcpu, CPUSTAT_RUNNING);
3086         vcpu->arch.enabled_gmap = gmap_get_enabled();
3087         gmap_disable(vcpu->arch.enabled_gmap);
3088
3089 }
3090
3091 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
3092 {
3093         mutex_lock(&vcpu->kvm->lock);
3094         preempt_disable();
3095         vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch;
3096         vcpu->arch.sie_block->epdx = vcpu->kvm->arch.epdx;
3097         preempt_enable();
3098         mutex_unlock(&vcpu->kvm->lock);
3099         if (!kvm_is_ucontrol(vcpu->kvm)) {
3100                 vcpu->arch.gmap = vcpu->kvm->arch.gmap;
3101                 sca_add_vcpu(vcpu);
3102         }
3103         if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0)
3104                 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
3105         /* make vcpu_load load the right gmap on the first trigger */
3106         vcpu->arch.enabled_gmap = vcpu->arch.gmap;
3107 }
3108
3109 static bool kvm_has_pckmo_subfunc(struct kvm *kvm, unsigned long nr)
3110 {
3111         if (test_bit_inv(nr, (unsigned long *)&kvm->arch.model.subfuncs.pckmo) &&
3112             test_bit_inv(nr, (unsigned long *)&kvm_s390_available_subfunc.pckmo))
3113                 return true;
3114         return false;
3115 }
3116
3117 static bool kvm_has_pckmo_ecc(struct kvm *kvm)
3118 {
3119         /* At least one ECC subfunction must be present */
3120         return kvm_has_pckmo_subfunc(kvm, 32) ||
3121                kvm_has_pckmo_subfunc(kvm, 33) ||
3122                kvm_has_pckmo_subfunc(kvm, 34) ||
3123                kvm_has_pckmo_subfunc(kvm, 40) ||
3124                kvm_has_pckmo_subfunc(kvm, 41);
3125
3126 }
3127
3128 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
3129 {
3130         /*
3131          * If the AP instructions are not being interpreted and the MSAX3
3132          * facility is not configured for the guest, there is nothing to set up.
3133          */
3134         if (!vcpu->kvm->arch.crypto.apie && !test_kvm_facility(vcpu->kvm, 76))
3135                 return;
3136
3137         vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd;
3138         vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA);
3139         vcpu->arch.sie_block->eca &= ~ECA_APIE;
3140         vcpu->arch.sie_block->ecd &= ~ECD_ECC;
3141
3142         if (vcpu->kvm->arch.crypto.apie)
3143                 vcpu->arch.sie_block->eca |= ECA_APIE;
3144
3145         /* Set up protected key support */
3146         if (vcpu->kvm->arch.crypto.aes_kw) {
3147                 vcpu->arch.sie_block->ecb3 |= ECB3_AES;
3148                 /* ecc is also wrapped with AES key */
3149                 if (kvm_has_pckmo_ecc(vcpu->kvm))
3150                         vcpu->arch.sie_block->ecd |= ECD_ECC;
3151         }
3152
3153         if (vcpu->kvm->arch.crypto.dea_kw)
3154                 vcpu->arch.sie_block->ecb3 |= ECB3_DEA;
3155 }
3156
3157 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu)
3158 {
3159         free_page(vcpu->arch.sie_block->cbrlo);
3160         vcpu->arch.sie_block->cbrlo = 0;
3161 }
3162
3163 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu)
3164 {
3165         vcpu->arch.sie_block->cbrlo = get_zeroed_page(GFP_KERNEL_ACCOUNT);
3166         if (!vcpu->arch.sie_block->cbrlo)
3167                 return -ENOMEM;
3168         return 0;
3169 }
3170
3171 static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu)
3172 {
3173         struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model;
3174
3175         vcpu->arch.sie_block->ibc = model->ibc;
3176         if (test_kvm_facility(vcpu->kvm, 7))
3177                 vcpu->arch.sie_block->fac = (u32)(u64) model->fac_list;
3178 }
3179
3180 static int kvm_s390_vcpu_setup(struct kvm_vcpu *vcpu)
3181 {
3182         int rc = 0;
3183         u16 uvrc, uvrrc;
3184
3185         atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
3186                                                     CPUSTAT_SM |
3187                                                     CPUSTAT_STOPPED);
3188
3189         if (test_kvm_facility(vcpu->kvm, 78))
3190                 kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED2);
3191         else if (test_kvm_facility(vcpu->kvm, 8))
3192                 kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED);
3193
3194         kvm_s390_vcpu_setup_model(vcpu);
3195
3196         /* pgste_set_pte has special handling for !MACHINE_HAS_ESOP */
3197         if (MACHINE_HAS_ESOP)
3198                 vcpu->arch.sie_block->ecb |= ECB_HOSTPROTINT;
3199         if (test_kvm_facility(vcpu->kvm, 9))
3200                 vcpu->arch.sie_block->ecb |= ECB_SRSI;
3201         if (test_kvm_facility(vcpu->kvm, 73))
3202                 vcpu->arch.sie_block->ecb |= ECB_TE;
3203
3204         if (test_kvm_facility(vcpu->kvm, 8) && vcpu->kvm->arch.use_pfmfi)
3205                 vcpu->arch.sie_block->ecb2 |= ECB2_PFMFI;
3206         if (test_kvm_facility(vcpu->kvm, 130))
3207                 vcpu->arch.sie_block->ecb2 |= ECB2_IEP;
3208         vcpu->arch.sie_block->eca = ECA_MVPGI | ECA_PROTEXCI;
3209         if (sclp.has_cei)
3210                 vcpu->arch.sie_block->eca |= ECA_CEI;
3211         if (sclp.has_ib)
3212                 vcpu->arch.sie_block->eca |= ECA_IB;
3213         if (sclp.has_siif)
3214                 vcpu->arch.sie_block->eca |= ECA_SII;
3215         if (sclp.has_sigpif)
3216                 vcpu->arch.sie_block->eca |= ECA_SIGPI;
3217         if (test_kvm_facility(vcpu->kvm, 129)) {
3218                 vcpu->arch.sie_block->eca |= ECA_VX;
3219                 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
3220         }
3221         if (test_kvm_facility(vcpu->kvm, 139))
3222                 vcpu->arch.sie_block->ecd |= ECD_MEF;
3223         if (test_kvm_facility(vcpu->kvm, 156))
3224                 vcpu->arch.sie_block->ecd |= ECD_ETOKENF;
3225         if (vcpu->arch.sie_block->gd) {
3226                 vcpu->arch.sie_block->eca |= ECA_AIV;
3227                 VCPU_EVENT(vcpu, 3, "AIV gisa format-%u enabled for cpu %03u",
3228                            vcpu->arch.sie_block->gd & 0x3, vcpu->vcpu_id);
3229         }
3230         vcpu->arch.sie_block->sdnxo = ((unsigned long) &vcpu->run->s.regs.sdnx)
3231                                         | SDNXC;
3232         vcpu->arch.sie_block->riccbd = (unsigned long) &vcpu->run->s.regs.riccb;
3233
3234         if (sclp.has_kss)
3235                 kvm_s390_set_cpuflags(vcpu, CPUSTAT_KSS);
3236         else
3237                 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
3238
3239         if (vcpu->kvm->arch.use_cmma) {
3240                 rc = kvm_s390_vcpu_setup_cmma(vcpu);
3241                 if (rc)
3242                         return rc;
3243         }
3244         hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
3245         vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
3246
3247         vcpu->arch.sie_block->hpid = HPID_KVM;
3248
3249         kvm_s390_vcpu_crypto_setup(vcpu);
3250
3251         mutex_lock(&vcpu->kvm->lock);
3252         if (kvm_s390_pv_is_protected(vcpu->kvm)) {
3253                 rc = kvm_s390_pv_create_cpu(vcpu, &uvrc, &uvrrc);
3254                 if (rc)
3255                         kvm_s390_vcpu_unsetup_cmma(vcpu);
3256         }
3257         mutex_unlock(&vcpu->kvm->lock);
3258
3259         return rc;
3260 }
3261
3262 int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
3263 {
3264         if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id))
3265                 return -EINVAL;
3266         return 0;
3267 }
3268
3269 int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
3270 {
3271         struct sie_page *sie_page;
3272         int rc;
3273
3274         BUILD_BUG_ON(sizeof(struct sie_page) != 4096);
3275         sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL_ACCOUNT);
3276         if (!sie_page)
3277                 return -ENOMEM;
3278
3279         vcpu->arch.sie_block = &sie_page->sie_block;
3280         vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb;
3281
3282         /* the real guest size will always be smaller than msl */
3283         vcpu->arch.sie_block->mso = 0;
3284         vcpu->arch.sie_block->msl = sclp.hamax;
3285
3286         vcpu->arch.sie_block->icpua = vcpu->vcpu_id;
3287         spin_lock_init(&vcpu->arch.local_int.lock);
3288         vcpu->arch.sie_block->gd = (u32)(u64)vcpu->kvm->arch.gisa_int.origin;
3289         if (vcpu->arch.sie_block->gd && sclp.has_gisaf)
3290                 vcpu->arch.sie_block->gd |= GISA_FORMAT1;
3291         seqcount_init(&vcpu->arch.cputm_seqcount);
3292
3293         vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
3294         kvm_clear_async_pf_completion_queue(vcpu);
3295         vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
3296                                     KVM_SYNC_GPRS |
3297                                     KVM_SYNC_ACRS |
3298                                     KVM_SYNC_CRS |
3299                                     KVM_SYNC_ARCH0 |
3300                                     KVM_SYNC_PFAULT |
3301                                     KVM_SYNC_DIAG318;
3302         kvm_s390_set_prefix(vcpu, 0);
3303         if (test_kvm_facility(vcpu->kvm, 64))
3304                 vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;
3305         if (test_kvm_facility(vcpu->kvm, 82))
3306                 vcpu->run->kvm_valid_regs |= KVM_SYNC_BPBC;
3307         if (test_kvm_facility(vcpu->kvm, 133))
3308                 vcpu->run->kvm_valid_regs |= KVM_SYNC_GSCB;
3309         if (test_kvm_facility(vcpu->kvm, 156))
3310                 vcpu->run->kvm_valid_regs |= KVM_SYNC_ETOKEN;
3311         /* fprs can be synchronized via vrs, even if the guest has no vx. With
3312          * MACHINE_HAS_VX, (load|store)_fpu_regs() will work with vrs format.
3313          */
3314         if (MACHINE_HAS_VX)
3315                 vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS;
3316         else
3317                 vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS;
3318
3319         if (kvm_is_ucontrol(vcpu->kvm)) {
3320                 rc = __kvm_ucontrol_vcpu_init(vcpu);
3321                 if (rc)
3322                         goto out_free_sie_block;
3323         }
3324
3325         VM_EVENT(vcpu->kvm, 3, "create cpu %d at 0x%pK, sie block at 0x%pK",
3326                  vcpu->vcpu_id, vcpu, vcpu->arch.sie_block);
3327         trace_kvm_s390_create_vcpu(vcpu->vcpu_id, vcpu, vcpu->arch.sie_block);
3328
3329         rc = kvm_s390_vcpu_setup(vcpu);
3330         if (rc)
3331                 goto out_ucontrol_uninit;
3332         return 0;
3333
3334 out_ucontrol_uninit:
3335         if (kvm_is_ucontrol(vcpu->kvm))
3336                 gmap_remove(vcpu->arch.gmap);
3337 out_free_sie_block:
3338         free_page((unsigned long)(vcpu->arch.sie_block));
3339         return rc;
3340 }
3341
3342 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
3343 {
3344         return kvm_s390_vcpu_has_irq(vcpu, 0);
3345 }
3346
3347 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
3348 {
3349         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE);
3350 }
3351
3352 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu)
3353 {
3354         atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
3355         exit_sie(vcpu);
3356 }
3357
3358 void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu)
3359 {
3360         atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
3361 }
3362
3363 static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu)
3364 {
3365         atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
3366         exit_sie(vcpu);
3367 }
3368
3369 bool kvm_s390_vcpu_sie_inhibited(struct kvm_vcpu *vcpu)
3370 {
3371         return atomic_read(&vcpu->arch.sie_block->prog20) &
3372                (PROG_BLOCK_SIE | PROG_REQUEST);
3373 }
3374
3375 static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu)
3376 {
3377         atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
3378 }
3379
3380 /*
3381  * Kick a guest cpu out of (v)SIE and wait until (v)SIE is not running.
3382  * If the CPU is not running (e.g. waiting as idle) the function will
3383  * return immediately. */
3384 void exit_sie(struct kvm_vcpu *vcpu)
3385 {
3386         kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
3387         kvm_s390_vsie_kick(vcpu);
3388         while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE)
3389                 cpu_relax();
3390 }
3391
3392 /* Kick a guest cpu out of SIE to process a request synchronously */
3393 void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu)
3394 {
3395         kvm_make_request(req, vcpu);
3396         kvm_s390_vcpu_request(vcpu);
3397 }
3398
3399 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
3400                               unsigned long end)
3401 {
3402         struct kvm *kvm = gmap->private;
3403         struct kvm_vcpu *vcpu;
3404         unsigned long prefix;
3405         int i;
3406
3407         if (gmap_is_shadow(gmap))
3408                 return;
3409         if (start >= 1UL << 31)
3410                 /* We are only interested in prefix pages */
3411                 return;
3412         kvm_for_each_vcpu(i, vcpu, kvm) {
3413                 /* match against both prefix pages */
3414                 prefix = kvm_s390_get_prefix(vcpu);
3415                 if (prefix <= end && start <= prefix + 2*PAGE_SIZE - 1) {
3416                         VCPU_EVENT(vcpu, 2, "gmap notifier for %lx-%lx",
3417                                    start, end);
3418                         kvm_s390_sync_request(KVM_REQ_MMU_RELOAD, vcpu);
3419                 }
3420         }
3421 }
3422
3423 bool kvm_arch_no_poll(struct kvm_vcpu *vcpu)
3424 {
3425         /* do not poll with more than halt_poll_max_steal percent of steal time */
3426         if (S390_lowcore.avg_steal_timer * 100 / (TICK_USEC << 12) >=
3427             halt_poll_max_steal) {
3428                 vcpu->stat.halt_no_poll_steal++;
3429                 return true;
3430         }
3431         return false;
3432 }
3433
3434 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
3435 {
3436         /* kvm common code refers to this, but never calls it */
3437         BUG();
3438         return 0;
3439 }
3440
3441 static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
3442                                            struct kvm_one_reg *reg)
3443 {
3444         int r = -EINVAL;
3445
3446         switch (reg->id) {
3447         case KVM_REG_S390_TODPR:
3448                 r = put_user(vcpu->arch.sie_block->todpr,
3449                              (u32 __user *)reg->addr);
3450                 break;
3451         case KVM_REG_S390_EPOCHDIFF:
3452                 r = put_user(vcpu->arch.sie_block->epoch,
3453                              (u64 __user *)reg->addr);
3454                 break;
3455         case KVM_REG_S390_CPU_TIMER:
3456                 r = put_user(kvm_s390_get_cpu_timer(vcpu),
3457                              (u64 __user *)reg->addr);
3458                 break;
3459         case KVM_REG_S390_CLOCK_COMP:
3460                 r = put_user(vcpu->arch.sie_block->ckc,
3461                              (u64 __user *)reg->addr);
3462                 break;
3463         case KVM_REG_S390_PFTOKEN:
3464                 r = put_user(vcpu->arch.pfault_token,
3465                              (u64 __user *)reg->addr);
3466                 break;
3467         case KVM_REG_S390_PFCOMPARE:
3468                 r = put_user(vcpu->arch.pfault_compare,
3469                              (u64 __user *)reg->addr);
3470                 break;
3471         case KVM_REG_S390_PFSELECT:
3472                 r = put_user(vcpu->arch.pfault_select,
3473                              (u64 __user *)reg->addr);
3474                 break;
3475         case KVM_REG_S390_PP:
3476                 r = put_user(vcpu->arch.sie_block->pp,
3477                              (u64 __user *)reg->addr);
3478                 break;
3479         case KVM_REG_S390_GBEA:
3480                 r = put_user(vcpu->arch.sie_block->gbea,
3481                              (u64 __user *)reg->addr);
3482                 break;
3483         default:
3484                 break;
3485         }
3486
3487         return r;
3488 }
3489
3490 static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
3491                                            struct kvm_one_reg *reg)
3492 {
3493         int r = -EINVAL;
3494         __u64 val;
3495
3496         switch (reg->id) {
3497         case KVM_REG_S390_TODPR:
3498                 r = get_user(vcpu->arch.sie_block->todpr,
3499                              (u32 __user *)reg->addr);
3500                 break;
3501         case KVM_REG_S390_EPOCHDIFF:
3502                 r = get_user(vcpu->arch.sie_block->epoch,
3503                              (u64 __user *)reg->addr);
3504                 break;
3505         case KVM_REG_S390_CPU_TIMER:
3506                 r = get_user(val, (u64 __user *)reg->addr);
3507                 if (!r)
3508                         kvm_s390_set_cpu_timer(vcpu, val);
3509                 break;
3510         case KVM_REG_S390_CLOCK_COMP:
3511                 r = get_user(vcpu->arch.sie_block->ckc,
3512                              (u64 __user *)reg->addr);
3513                 break;
3514         case KVM_REG_S390_PFTOKEN:
3515                 r = get_user(vcpu->arch.pfault_token,
3516                              (u64 __user *)reg->addr);
3517                 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
3518                         kvm_clear_async_pf_completion_queue(vcpu);
3519                 break;
3520         case KVM_REG_S390_PFCOMPARE:
3521                 r = get_user(vcpu->arch.pfault_compare,
3522                              (u64 __user *)reg->addr);
3523                 break;
3524         case KVM_REG_S390_PFSELECT:
3525                 r = get_user(vcpu->arch.pfault_select,
3526                              (u64 __user *)reg->addr);
3527                 break;
3528         case KVM_REG_S390_PP:
3529                 r = get_user(vcpu->arch.sie_block->pp,
3530                              (u64 __user *)reg->addr);
3531                 break;
3532         case KVM_REG_S390_GBEA:
3533                 r = get_user(vcpu->arch.sie_block->gbea,
3534                              (u64 __user *)reg->addr);
3535                 break;
3536         default:
3537                 break;
3538         }
3539
3540         return r;
3541 }
3542
3543 static void kvm_arch_vcpu_ioctl_normal_reset(struct kvm_vcpu *vcpu)
3544 {
3545         vcpu->arch.sie_block->gpsw.mask &= ~PSW_MASK_RI;
3546         vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
3547         memset(vcpu->run->s.regs.riccb, 0, sizeof(vcpu->run->s.regs.riccb));
3548
3549         kvm_clear_async_pf_completion_queue(vcpu);
3550         if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
3551                 kvm_s390_vcpu_stop(vcpu);
3552         kvm_s390_clear_local_irqs(vcpu);
3553 }
3554
3555 static void kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
3556 {
3557         /* Initial reset is a superset of the normal reset */
3558         kvm_arch_vcpu_ioctl_normal_reset(vcpu);
3559
3560         /*
3561          * This equals initial cpu reset in pop, but we don't switch to ESA.
3562          * We do not only reset the internal data, but also ...
3563          */
3564         vcpu->arch.sie_block->gpsw.mask = 0;
3565         vcpu->arch.sie_block->gpsw.addr = 0;
3566         kvm_s390_set_prefix(vcpu, 0);
3567         kvm_s390_set_cpu_timer(vcpu, 0);
3568         vcpu->arch.sie_block->ckc = 0;
3569         memset(vcpu->arch.sie_block->gcr, 0, sizeof(vcpu->arch.sie_block->gcr));
3570         vcpu->arch.sie_block->gcr[0] = CR0_INITIAL_MASK;
3571         vcpu->arch.sie_block->gcr[14] = CR14_INITIAL_MASK;
3572
3573         /* ... the data in sync regs */
3574         memset(vcpu->run->s.regs.crs, 0, sizeof(vcpu->run->s.regs.crs));
3575         vcpu->run->s.regs.ckc = 0;
3576         vcpu->run->s.regs.crs[0] = CR0_INITIAL_MASK;
3577         vcpu->run->s.regs.crs[14] = CR14_INITIAL_MASK;
3578         vcpu->run->psw_addr = 0;
3579         vcpu->run->psw_mask = 0;
3580         vcpu->run->s.regs.todpr = 0;
3581         vcpu->run->s.regs.cputm = 0;
3582         vcpu->run->s.regs.ckc = 0;
3583         vcpu->run->s.regs.pp = 0;
3584         vcpu->run->s.regs.gbea = 1;
3585         vcpu->run->s.regs.fpc = 0;
3586         /*
3587          * Do not reset these registers in the protected case, as some of
3588          * them are overlayed and they are not accessible in this case
3589          * anyway.
3590          */
3591         if (!kvm_s390_pv_cpu_is_protected(vcpu)) {
3592                 vcpu->arch.sie_block->gbea = 1;
3593                 vcpu->arch.sie_block->pp = 0;
3594                 vcpu->arch.sie_block->fpf &= ~FPF_BPBC;
3595                 vcpu->arch.sie_block->todpr = 0;
3596         }
3597 }
3598
3599 static void kvm_arch_vcpu_ioctl_clear_reset(struct kvm_vcpu *vcpu)
3600 {
3601         struct kvm_sync_regs *regs = &vcpu->run->s.regs;
3602
3603         /* Clear reset is a superset of the initial reset */
3604         kvm_arch_vcpu_ioctl_initial_reset(vcpu);
3605
3606         memset(&regs->gprs, 0, sizeof(regs->gprs));
3607         memset(&regs->vrs, 0, sizeof(regs->vrs));
3608         memset(&regs->acrs, 0, sizeof(regs->acrs));
3609         memset(&regs->gscb, 0, sizeof(regs->gscb));
3610
3611         regs->etoken = 0;
3612         regs->etoken_extension = 0;
3613 }
3614
3615 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
3616 {
3617         vcpu_load(vcpu);
3618         memcpy(&vcpu->run->s.regs.gprs, &regs->gprs, sizeof(regs->gprs));
3619         vcpu_put(vcpu);
3620         return 0;
3621 }
3622
3623 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
3624 {
3625         vcpu_load(vcpu);
3626         memcpy(&regs->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs));
3627         vcpu_put(vcpu);
3628         return 0;
3629 }
3630
3631 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
3632                                   struct kvm_sregs *sregs)
3633 {
3634         vcpu_load(vcpu);
3635
3636         memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs));
3637         memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));
3638
3639         vcpu_put(vcpu);
3640         return 0;
3641 }
3642
3643 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
3644                                   struct kvm_sregs *sregs)
3645 {
3646         vcpu_load(vcpu);
3647
3648         memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs));
3649         memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs));
3650
3651         vcpu_put(vcpu);
3652         return 0;
3653 }
3654
3655 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
3656 {
3657         int ret = 0;
3658
3659         vcpu_load(vcpu);
3660
3661         if (test_fp_ctl(fpu->fpc)) {
3662                 ret = -EINVAL;
3663                 goto out;
3664         }
3665         vcpu->run->s.regs.fpc = fpu->fpc;
3666         if (MACHINE_HAS_VX)
3667                 convert_fp_to_vx((__vector128 *) vcpu->run->s.regs.vrs,
3668                                  (freg_t *) fpu->fprs);
3669         else
3670                 memcpy(vcpu->run->s.regs.fprs, &fpu->fprs, sizeof(fpu->fprs));
3671
3672 out:
3673         vcpu_put(vcpu);
3674         return ret;
3675 }
3676
3677 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
3678 {
3679         vcpu_load(vcpu);
3680
3681         /* make sure we have the latest values */
3682         save_fpu_regs();
3683         if (MACHINE_HAS_VX)
3684                 convert_vx_to_fp((freg_t *) fpu->fprs,
3685                                  (__vector128 *) vcpu->run->s.regs.vrs);
3686         else
3687                 memcpy(fpu->fprs, vcpu->run->s.regs.fprs, sizeof(fpu->fprs));
3688         fpu->fpc = vcpu->run->s.regs.fpc;
3689
3690         vcpu_put(vcpu);
3691         return 0;
3692 }
3693
3694 static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
3695 {
3696         int rc = 0;
3697
3698         if (!is_vcpu_stopped(vcpu))
3699                 rc = -EBUSY;
3700         else {
3701                 vcpu->run->psw_mask = psw.mask;
3702                 vcpu->run->psw_addr = psw.addr;
3703         }
3704         return rc;
3705 }
3706
3707 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
3708                                   struct kvm_translation *tr)
3709 {
3710         return -EINVAL; /* not implemented yet */
3711 }
3712
3713 #define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \
3714                               KVM_GUESTDBG_USE_HW_BP | \
3715                               KVM_GUESTDBG_ENABLE)
3716
3717 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
3718                                         struct kvm_guest_debug *dbg)
3719 {
3720         int rc = 0;
3721
3722         vcpu_load(vcpu);
3723
3724         vcpu->guest_debug = 0;
3725         kvm_s390_clear_bp_data(vcpu);
3726
3727         if (dbg->control & ~VALID_GUESTDBG_FLAGS) {
3728                 rc = -EINVAL;
3729                 goto out;
3730         }
3731         if (!sclp.has_gpere) {
3732                 rc = -EINVAL;
3733                 goto out;
3734         }
3735
3736         if (dbg->control & KVM_GUESTDBG_ENABLE) {
3737                 vcpu->guest_debug = dbg->control;
3738                 /* enforce guest PER */
3739                 kvm_s390_set_cpuflags(vcpu, CPUSTAT_P);
3740
3741                 if (dbg->control & KVM_GUESTDBG_USE_HW_BP)
3742                         rc = kvm_s390_import_bp_data(vcpu, dbg);
3743         } else {
3744                 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P);
3745                 vcpu->arch.guestdbg.last_bp = 0;
3746         }
3747
3748         if (rc) {
3749                 vcpu->guest_debug = 0;
3750                 kvm_s390_clear_bp_data(vcpu);
3751                 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P);
3752         }
3753
3754 out:
3755         vcpu_put(vcpu);
3756         return rc;
3757 }
3758
3759 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
3760                                     struct kvm_mp_state *mp_state)
3761 {
3762         int ret;
3763
3764         vcpu_load(vcpu);
3765
3766         /* CHECK_STOP and LOAD are not supported yet */
3767         ret = is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED :
3768                                       KVM_MP_STATE_OPERATING;
3769
3770         vcpu_put(vcpu);
3771         return ret;
3772 }
3773
3774 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
3775                                     struct kvm_mp_state *mp_state)
3776 {
3777         int rc = 0;
3778
3779         vcpu_load(vcpu);
3780
3781         /* user space knows about this interface - let it control the state */
3782         vcpu->kvm->arch.user_cpu_state_ctrl = 1;
3783
3784         switch (mp_state->mp_state) {
3785         case KVM_MP_STATE_STOPPED:
3786                 rc = kvm_s390_vcpu_stop(vcpu);
3787                 break;
3788         case KVM_MP_STATE_OPERATING:
3789                 rc = kvm_s390_vcpu_start(vcpu);
3790                 break;
3791         case KVM_MP_STATE_LOAD:
3792                 if (!kvm_s390_pv_cpu_is_protected(vcpu)) {
3793                         rc = -ENXIO;
3794                         break;
3795                 }
3796                 rc = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR_LOAD);
3797                 break;
3798         case KVM_MP_STATE_CHECK_STOP:
3799                 fallthrough;    /* CHECK_STOP and LOAD are not supported yet */
3800         default:
3801                 rc = -ENXIO;
3802         }
3803
3804         vcpu_put(vcpu);
3805         return rc;
3806 }
3807
3808 static bool ibs_enabled(struct kvm_vcpu *vcpu)
3809 {
3810         return kvm_s390_test_cpuflags(vcpu, CPUSTAT_IBS);
3811 }
3812
3813 static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
3814 {
3815 retry:
3816         kvm_s390_vcpu_request_handled(vcpu);
3817         if (!kvm_request_pending(vcpu))
3818                 return 0;
3819         /*
3820          * We use MMU_RELOAD just to re-arm the ipte notifier for the
3821          * guest prefix page. gmap_mprotect_notify will wait on the ptl lock.
3822          * This ensures that the ipte instruction for this request has
3823          * already finished. We might race against a second unmapper that
3824          * wants to set the blocking bit. Lets just retry the request loop.
3825          */
3826         if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) {
3827                 int rc;
3828                 rc = gmap_mprotect_notify(vcpu->arch.gmap,
3829                                           kvm_s390_get_prefix(vcpu),
3830                                           PAGE_SIZE * 2, PROT_WRITE);
3831                 if (rc) {
3832                         kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
3833                         return rc;
3834                 }
3835                 goto retry;
3836         }
3837
3838         if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
3839                 vcpu->arch.sie_block->ihcpu = 0xffff;
3840                 goto retry;
3841         }
3842
3843         if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) {
3844                 if (!ibs_enabled(vcpu)) {
3845                         trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1);
3846                         kvm_s390_set_cpuflags(vcpu, CPUSTAT_IBS);
3847                 }
3848                 goto retry;
3849         }
3850
3851         if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) {
3852                 if (ibs_enabled(vcpu)) {
3853                         trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0);
3854                         kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IBS);
3855                 }
3856                 goto retry;
3857         }
3858
3859         if (kvm_check_request(KVM_REQ_ICPT_OPEREXC, vcpu)) {
3860                 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
3861                 goto retry;
3862         }
3863
3864         if (kvm_check_request(KVM_REQ_START_MIGRATION, vcpu)) {
3865                 /*
3866                  * Disable CMM virtualization; we will emulate the ESSA
3867                  * instruction manually, in order to provide additional
3868                  * functionalities needed for live migration.
3869                  */
3870                 vcpu->arch.sie_block->ecb2 &= ~ECB2_CMMA;
3871                 goto retry;
3872         }
3873
3874         if (kvm_check_request(KVM_REQ_STOP_MIGRATION, vcpu)) {
3875                 /*
3876                  * Re-enable CMM virtualization if CMMA is available and
3877                  * CMM has been used.
3878                  */
3879                 if ((vcpu->kvm->arch.use_cmma) &&
3880                     (vcpu->kvm->mm->context.uses_cmm))
3881                         vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
3882                 goto retry;
3883         }
3884
3885         /* nothing to do, just clear the request */
3886         kvm_clear_request(KVM_REQ_UNHALT, vcpu);
3887         /* we left the vsie handler, nothing to do, just clear the request */
3888         kvm_clear_request(KVM_REQ_VSIE_RESTART, vcpu);
3889
3890         return 0;
3891 }
3892
3893 void kvm_s390_set_tod_clock(struct kvm *kvm,
3894                             const struct kvm_s390_vm_tod_clock *gtod)
3895 {
3896         struct kvm_vcpu *vcpu;
3897         union tod_clock clk;
3898         int i;
3899
3900         mutex_lock(&kvm->lock);
3901         preempt_disable();
3902
3903         store_tod_clock_ext(&clk);
3904
3905         kvm->arch.epoch = gtod->tod - clk.tod;
3906         kvm->arch.epdx = 0;
3907         if (test_kvm_facility(kvm, 139)) {
3908                 kvm->arch.epdx = gtod->epoch_idx - clk.ei;
3909                 if (kvm->arch.epoch > gtod->tod)
3910                         kvm->arch.epdx -= 1;
3911         }
3912
3913         kvm_s390_vcpu_block_all(kvm);
3914         kvm_for_each_vcpu(i, vcpu, kvm) {
3915                 vcpu->arch.sie_block->epoch = kvm->arch.epoch;
3916                 vcpu->arch.sie_block->epdx  = kvm->arch.epdx;
3917         }
3918
3919         kvm_s390_vcpu_unblock_all(kvm);
3920         preempt_enable();
3921         mutex_unlock(&kvm->lock);
3922 }
3923
3924 /**
3925  * kvm_arch_fault_in_page - fault-in guest page if necessary
3926  * @vcpu: The corresponding virtual cpu
3927  * @gpa: Guest physical address
3928  * @writable: Whether the page should be writable or not
3929  *
3930  * Make sure that a guest page has been faulted-in on the host.
3931  *
3932  * Return: Zero on success, negative error code otherwise.
3933  */
3934 long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable)
3935 {
3936         return gmap_fault(vcpu->arch.gmap, gpa,
3937                           writable ? FAULT_FLAG_WRITE : 0);
3938 }
3939
3940 static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token,
3941                                       unsigned long token)
3942 {
3943         struct kvm_s390_interrupt inti;
3944         struct kvm_s390_irq irq;
3945
3946         if (start_token) {
3947                 irq.u.ext.ext_params2 = token;
3948                 irq.type = KVM_S390_INT_PFAULT_INIT;
3949                 WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq));
3950         } else {
3951                 inti.type = KVM_S390_INT_PFAULT_DONE;
3952                 inti.parm64 = token;
3953                 WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti));
3954         }
3955 }
3956
3957 bool kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
3958                                      struct kvm_async_pf *work)
3959 {
3960         trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token);
3961         __kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token);
3962
3963         return true;
3964 }
3965
3966 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
3967                                  struct kvm_async_pf *work)
3968 {
3969         trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token);
3970         __kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token);
3971 }
3972
3973 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu,
3974                                struct kvm_async_pf *work)
3975 {
3976         /* s390 will always inject the page directly */
3977 }
3978
3979 bool kvm_arch_can_dequeue_async_page_present(struct kvm_vcpu *vcpu)
3980 {
3981         /*
3982          * s390 will always inject the page directly,
3983          * but we still want check_async_completion to cleanup
3984          */
3985         return true;
3986 }
3987
3988 static bool kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu)
3989 {
3990         hva_t hva;
3991         struct kvm_arch_async_pf arch;
3992
3993         if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
3994                 return false;
3995         if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) !=
3996             vcpu->arch.pfault_compare)
3997                 return false;
3998         if (psw_extint_disabled(vcpu))
3999                 return false;
4000         if (kvm_s390_vcpu_has_irq(vcpu, 0))
4001                 return false;
4002         if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK))
4003                 return false;
4004         if (!vcpu->arch.gmap->pfault_enabled)
4005                 return false;
4006
4007         hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr));
4008         hva += current->thread.gmap_addr & ~PAGE_MASK;
4009         if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8))
4010                 return false;
4011
4012         return kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch);
4013 }
4014
4015 static int vcpu_pre_run(struct kvm_vcpu *vcpu)
4016 {
4017         int rc, cpuflags;
4018
4019         /*
4020          * On s390 notifications for arriving pages will be delivered directly
4021          * to the guest but the house keeping for completed pfaults is
4022          * handled outside the worker.
4023          */
4024         kvm_check_async_pf_completion(vcpu);
4025
4026         vcpu->arch.sie_block->gg14 = vcpu->run->s.regs.gprs[14];
4027         vcpu->arch.sie_block->gg15 = vcpu->run->s.regs.gprs[15];
4028
4029         if (need_resched())
4030                 schedule();
4031
4032         if (!kvm_is_ucontrol(vcpu->kvm)) {
4033                 rc = kvm_s390_deliver_pending_interrupts(vcpu);
4034                 if (rc)
4035                         return rc;
4036         }
4037
4038         rc = kvm_s390_handle_requests(vcpu);
4039         if (rc)
4040                 return rc;
4041
4042         if (guestdbg_enabled(vcpu)) {
4043                 kvm_s390_backup_guest_per_regs(vcpu);
4044                 kvm_s390_patch_guest_per_regs(vcpu);
4045         }
4046
4047         clear_bit(vcpu->vcpu_id, vcpu->kvm->arch.gisa_int.kicked_mask);
4048
4049         vcpu->arch.sie_block->icptcode = 0;
4050         cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags);
4051         VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags);
4052         trace_kvm_s390_sie_enter(vcpu, cpuflags);
4053
4054         return 0;
4055 }
4056
4057 static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu)
4058 {
4059         struct kvm_s390_pgm_info pgm_info = {
4060                 .code = PGM_ADDRESSING,
4061         };
4062         u8 opcode, ilen;
4063         int rc;
4064
4065         VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction");
4066         trace_kvm_s390_sie_fault(vcpu);
4067
4068         /*
4069          * We want to inject an addressing exception, which is defined as a
4070          * suppressing or terminating exception. However, since we came here
4071          * by a DAT access exception, the PSW still points to the faulting
4072          * instruction since DAT exceptions are nullifying. So we've got
4073          * to look up the current opcode to get the length of the instruction
4074          * to be able to forward the PSW.
4075          */
4076         rc = read_guest_instr(vcpu, vcpu->arch.sie_block->gpsw.addr, &opcode, 1);
4077         ilen = insn_length(opcode);
4078         if (rc < 0) {
4079                 return rc;
4080         } else if (rc) {
4081                 /* Instruction-Fetching Exceptions - we can't detect the ilen.
4082                  * Forward by arbitrary ilc, injection will take care of
4083                  * nullification if necessary.
4084                  */
4085                 pgm_info = vcpu->arch.pgm;
4086                 ilen = 4;
4087         }
4088         pgm_info.flags = ilen | KVM_S390_PGM_FLAGS_ILC_VALID;
4089         kvm_s390_forward_psw(vcpu, ilen);
4090         return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
4091 }
4092
4093 static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason)
4094 {
4095         struct mcck_volatile_info *mcck_info;
4096         struct sie_page *sie_page;
4097
4098         VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
4099                    vcpu->arch.sie_block->icptcode);
4100         trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);
4101
4102         if (guestdbg_enabled(vcpu))
4103                 kvm_s390_restore_guest_per_regs(vcpu);
4104
4105         vcpu->run->s.regs.gprs[14] = vcpu->arch.sie_block->gg14;
4106         vcpu->run->s.regs.gprs[15] = vcpu->arch.sie_block->gg15;
4107
4108         if (exit_reason == -EINTR) {
4109                 VCPU_EVENT(vcpu, 3, "%s", "machine check");
4110                 sie_page = container_of(vcpu->arch.sie_block,
4111                                         struct sie_page, sie_block);
4112                 mcck_info = &sie_page->mcck_info;
4113                 kvm_s390_reinject_machine_check(vcpu, mcck_info);
4114                 return 0;
4115         }
4116
4117         if (vcpu->arch.sie_block->icptcode > 0) {
4118                 int rc = kvm_handle_sie_intercept(vcpu);
4119
4120                 if (rc != -EOPNOTSUPP)
4121                         return rc;
4122                 vcpu->run->exit_reason = KVM_EXIT_S390_SIEIC;
4123                 vcpu->run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode;
4124                 vcpu->run->s390_sieic.ipa = vcpu->arch.sie_block->ipa;
4125                 vcpu->run->s390_sieic.ipb = vcpu->arch.sie_block->ipb;
4126                 return -EREMOTE;
4127         } else if (exit_reason != -EFAULT) {
4128                 vcpu->stat.exit_null++;
4129                 return 0;
4130         } else if (kvm_is_ucontrol(vcpu->kvm)) {
4131                 vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL;
4132                 vcpu->run->s390_ucontrol.trans_exc_code =
4133                                                 current->thread.gmap_addr;
4134                 vcpu->run->s390_ucontrol.pgm_code = 0x10;
4135                 return -EREMOTE;
4136         } else if (current->thread.gmap_pfault) {
4137                 trace_kvm_s390_major_guest_pfault(vcpu);
4138                 current->thread.gmap_pfault = 0;
4139                 if (kvm_arch_setup_async_pf(vcpu))
4140                         return 0;
4141                 vcpu->stat.pfault_sync++;
4142                 return kvm_arch_fault_in_page(vcpu, current->thread.gmap_addr, 1);
4143         }
4144         return vcpu_post_run_fault_in_sie(vcpu);
4145 }
4146
4147 #define PSW_INT_MASK (PSW_MASK_EXT | PSW_MASK_IO | PSW_MASK_MCHECK)
4148 static int __vcpu_run(struct kvm_vcpu *vcpu)
4149 {
4150         int rc, exit_reason;
4151         struct sie_page *sie_page = (struct sie_page *)vcpu->arch.sie_block;
4152
4153         /*
4154          * We try to hold kvm->srcu during most of vcpu_run (except when run-
4155          * ning the guest), so that memslots (and other stuff) are protected
4156          */
4157         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
4158
4159         do {
4160                 rc = vcpu_pre_run(vcpu);
4161                 if (rc)
4162                         break;
4163
4164                 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
4165                 /*
4166                  * As PF_VCPU will be used in fault handler, between
4167                  * guest_enter and guest_exit should be no uaccess.
4168                  */
4169                 local_irq_disable();
4170                 guest_enter_irqoff();
4171                 __disable_cpu_timer_accounting(vcpu);
4172                 local_irq_enable();
4173                 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
4174                         memcpy(sie_page->pv_grregs,
4175                                vcpu->run->s.regs.gprs,
4176                                sizeof(sie_page->pv_grregs));
4177                 }
4178                 if (test_cpu_flag(CIF_FPU))
4179                         load_fpu_regs();
4180                 exit_reason = sie64a(vcpu->arch.sie_block,
4181                                      vcpu->run->s.regs.gprs);
4182                 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
4183                         memcpy(vcpu->run->s.regs.gprs,
4184                                sie_page->pv_grregs,
4185                                sizeof(sie_page->pv_grregs));
4186                         /*
4187                          * We're not allowed to inject interrupts on intercepts
4188                          * that leave the guest state in an "in-between" state
4189                          * where the next SIE entry will do a continuation.
4190                          * Fence interrupts in our "internal" PSW.
4191                          */
4192                         if (vcpu->arch.sie_block->icptcode == ICPT_PV_INSTR ||
4193                             vcpu->arch.sie_block->icptcode == ICPT_PV_PREF) {
4194                                 vcpu->arch.sie_block->gpsw.mask &= ~PSW_INT_MASK;
4195                         }
4196                 }
4197                 local_irq_disable();
4198                 __enable_cpu_timer_accounting(vcpu);
4199                 guest_exit_irqoff();
4200                 local_irq_enable();
4201                 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
4202
4203                 rc = vcpu_post_run(vcpu, exit_reason);
4204         } while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc);
4205
4206         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
4207         return rc;
4208 }
4209
4210 static void sync_regs_fmt2(struct kvm_vcpu *vcpu)
4211 {
4212         struct kvm_run *kvm_run = vcpu->run;
4213         struct runtime_instr_cb *riccb;
4214         struct gs_cb *gscb;
4215
4216         riccb = (struct runtime_instr_cb *) &kvm_run->s.regs.riccb;
4217         gscb = (struct gs_cb *) &kvm_run->s.regs.gscb;
4218         vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
4219         vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
4220         if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
4221                 vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr;
4222                 vcpu->arch.sie_block->pp = kvm_run->s.regs.pp;
4223                 vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea;
4224         }
4225         if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) {
4226                 vcpu->arch.pfault_token = kvm_run->s.regs.pft;
4227                 vcpu->arch.pfault_select = kvm_run->s.regs.pfs;
4228                 vcpu->arch.pfault_compare = kvm_run->s.regs.pfc;
4229                 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
4230                         kvm_clear_async_pf_completion_queue(vcpu);
4231         }
4232         if (kvm_run->kvm_dirty_regs & KVM_SYNC_DIAG318) {
4233                 vcpu->arch.diag318_info.val = kvm_run->s.regs.diag318;
4234                 vcpu->arch.sie_block->cpnc = vcpu->arch.diag318_info.cpnc;
4235         }
4236         /*
4237          * If userspace sets the riccb (e.g. after migration) to a valid state,
4238          * we should enable RI here instead of doing the lazy enablement.
4239          */
4240         if ((kvm_run->kvm_dirty_regs & KVM_SYNC_RICCB) &&
4241             test_kvm_facility(vcpu->kvm, 64) &&
4242             riccb->v &&
4243             !(vcpu->arch.sie_block->ecb3 & ECB3_RI)) {
4244                 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (sync_regs)");
4245                 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
4246         }
4247         /*
4248          * If userspace sets the gscb (e.g. after migration) to non-zero,
4249          * we should enable GS here instead of doing the lazy enablement.
4250          */
4251         if ((kvm_run->kvm_dirty_regs & KVM_SYNC_GSCB) &&
4252             test_kvm_facility(vcpu->kvm, 133) &&
4253             gscb->gssm &&
4254             !vcpu->arch.gs_enabled) {
4255                 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (sync_regs)");
4256                 vcpu->arch.sie_block->ecb |= ECB_GS;
4257                 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
4258                 vcpu->arch.gs_enabled = 1;
4259         }
4260         if ((kvm_run->kvm_dirty_regs & KVM_SYNC_BPBC) &&
4261             test_kvm_facility(vcpu->kvm, 82)) {
4262                 vcpu->arch.sie_block->fpf &= ~FPF_BPBC;
4263                 vcpu->arch.sie_block->fpf |= kvm_run->s.regs.bpbc ? FPF_BPBC : 0;
4264         }
4265         if (MACHINE_HAS_GS) {
4266                 preempt_disable();
4267                 __ctl_set_bit(2, 4);
4268                 if (current->thread.gs_cb) {
4269                         vcpu->arch.host_gscb = current->thread.gs_cb;
4270                         save_gs_cb(vcpu->arch.host_gscb);
4271                 }
4272                 if (vcpu->arch.gs_enabled) {
4273                         current->thread.gs_cb = (struct gs_cb *)
4274                                                 &vcpu->run->s.regs.gscb;
4275                         restore_gs_cb(current->thread.gs_cb);
4276                 }
4277                 preempt_enable();
4278         }
4279         /* SIE will load etoken directly from SDNX and therefore kvm_run */
4280 }
4281
4282 static void sync_regs(struct kvm_vcpu *vcpu)
4283 {
4284         struct kvm_run *kvm_run = vcpu->run;
4285
4286         if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX)
4287                 kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
4288         if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) {
4289                 memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128);
4290                 /* some control register changes require a tlb flush */
4291                 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
4292         }
4293         if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
4294                 kvm_s390_set_cpu_timer(vcpu, kvm_run->s.regs.cputm);
4295                 vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc;
4296         }
4297         save_access_regs(vcpu->arch.host_acrs);
4298         restore_access_regs(vcpu->run->s.regs.acrs);
4299         /* save host (userspace) fprs/vrs */
4300         save_fpu_regs();
4301         vcpu->arch.host_fpregs.fpc = current->thread.fpu.fpc;
4302         vcpu->arch.host_fpregs.regs = current->thread.fpu.regs;
4303         if (MACHINE_HAS_VX)
4304                 current->thread.fpu.regs = vcpu->run->s.regs.vrs;
4305         else
4306                 current->thread.fpu.regs = vcpu->run->s.regs.fprs;
4307         current->thread.fpu.fpc = vcpu->run->s.regs.fpc;
4308         if (test_fp_ctl(current->thread.fpu.fpc))
4309                 /* User space provided an invalid FPC, let's clear it */
4310                 current->thread.fpu.fpc = 0;
4311
4312         /* Sync fmt2 only data */
4313         if (likely(!kvm_s390_pv_cpu_is_protected(vcpu))) {
4314                 sync_regs_fmt2(vcpu);
4315         } else {
4316                 /*
4317                  * In several places we have to modify our internal view to
4318                  * not do things that are disallowed by the ultravisor. For
4319                  * example we must not inject interrupts after specific exits
4320                  * (e.g. 112 prefix page not secure). We do this by turning
4321                  * off the machine check, external and I/O interrupt bits
4322                  * of our PSW copy. To avoid getting validity intercepts, we
4323                  * do only accept the condition code from userspace.
4324                  */
4325                 vcpu->arch.sie_block->gpsw.mask &= ~PSW_MASK_CC;
4326                 vcpu->arch.sie_block->gpsw.mask |= kvm_run->psw_mask &
4327                                                    PSW_MASK_CC;
4328         }
4329
4330         kvm_run->kvm_dirty_regs = 0;
4331 }
4332
4333 static void store_regs_fmt2(struct kvm_vcpu *vcpu)
4334 {
4335         struct kvm_run *kvm_run = vcpu->run;
4336
4337         kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr;
4338         kvm_run->s.regs.pp = vcpu->arch.sie_block->pp;
4339         kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea;
4340         kvm_run->s.regs.bpbc = (vcpu->arch.sie_block->fpf & FPF_BPBC) == FPF_BPBC;
4341         kvm_run->s.regs.diag318 = vcpu->arch.diag318_info.val;
4342         if (MACHINE_HAS_GS) {
4343                 preempt_disable();
4344                 __ctl_set_bit(2, 4);
4345                 if (vcpu->arch.gs_enabled)
4346                         save_gs_cb(current->thread.gs_cb);
4347                 current->thread.gs_cb = vcpu->arch.host_gscb;
4348                 restore_gs_cb(vcpu->arch.host_gscb);
4349                 if (!vcpu->arch.host_gscb)
4350                         __ctl_clear_bit(2, 4);
4351                 vcpu->arch.host_gscb = NULL;
4352                 preempt_enable();
4353         }
4354         /* SIE will save etoken directly into SDNX and therefore kvm_run */
4355 }
4356
4357 static void store_regs(struct kvm_vcpu *vcpu)
4358 {
4359         struct kvm_run *kvm_run = vcpu->run;
4360
4361         kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask;
4362         kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr;
4363         kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu);
4364         memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128);
4365         kvm_run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu);
4366         kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc;
4367         kvm_run->s.regs.pft = vcpu->arch.pfault_token;
4368         kvm_run->s.regs.pfs = vcpu->arch.pfault_select;
4369         kvm_run->s.regs.pfc = vcpu->arch.pfault_compare;
4370         save_access_regs(vcpu->run->s.regs.acrs);
4371         restore_access_regs(vcpu->arch.host_acrs);
4372         /* Save guest register state */
4373         save_fpu_regs();
4374         vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
4375         /* Restore will be done lazily at return */
4376         current->thread.fpu.fpc = vcpu->arch.host_fpregs.fpc;
4377         current->thread.fpu.regs = vcpu->arch.host_fpregs.regs;
4378         if (likely(!kvm_s390_pv_cpu_is_protected(vcpu)))
4379                 store_regs_fmt2(vcpu);
4380 }
4381
4382 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
4383 {
4384         struct kvm_run *kvm_run = vcpu->run;
4385         int rc;
4386
4387         if (kvm_run->immediate_exit)
4388                 return -EINTR;
4389
4390         if (kvm_run->kvm_valid_regs & ~KVM_SYNC_S390_VALID_FIELDS ||
4391             kvm_run->kvm_dirty_regs & ~KVM_SYNC_S390_VALID_FIELDS)
4392                 return -EINVAL;
4393
4394         vcpu_load(vcpu);
4395
4396         if (guestdbg_exit_pending(vcpu)) {
4397                 kvm_s390_prepare_debug_exit(vcpu);
4398                 rc = 0;
4399                 goto out;
4400         }
4401
4402         kvm_sigset_activate(vcpu);
4403
4404         /*
4405          * no need to check the return value of vcpu_start as it can only have
4406          * an error for protvirt, but protvirt means user cpu state
4407          */
4408         if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) {
4409                 kvm_s390_vcpu_start(vcpu);
4410         } else if (is_vcpu_stopped(vcpu)) {
4411                 pr_err_ratelimited("can't run stopped vcpu %d\n",
4412                                    vcpu->vcpu_id);
4413                 rc = -EINVAL;
4414                 goto out;
4415         }
4416
4417         sync_regs(vcpu);
4418         enable_cpu_timer_accounting(vcpu);
4419
4420         might_fault();
4421         rc = __vcpu_run(vcpu);
4422
4423         if (signal_pending(current) && !rc) {
4424                 kvm_run->exit_reason = KVM_EXIT_INTR;
4425                 rc = -EINTR;
4426         }
4427
4428         if (guestdbg_exit_pending(vcpu) && !rc)  {
4429                 kvm_s390_prepare_debug_exit(vcpu);
4430                 rc = 0;
4431         }
4432
4433         if (rc == -EREMOTE) {
4434                 /* userspace support is needed, kvm_run has been prepared */
4435                 rc = 0;
4436         }
4437
4438         disable_cpu_timer_accounting(vcpu);
4439         store_regs(vcpu);
4440
4441         kvm_sigset_deactivate(vcpu);
4442
4443         vcpu->stat.exit_userspace++;
4444 out:
4445         vcpu_put(vcpu);
4446         return rc;
4447 }
4448
4449 /*
4450  * store status at address
4451  * we use have two special cases:
4452  * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit
4453  * KVM_S390_STORE_STATUS_PREFIXED: -> prefix
4454  */
4455 int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa)
4456 {
4457         unsigned char archmode = 1;
4458         freg_t fprs[NUM_FPRS];
4459         unsigned int px;
4460         u64 clkcomp, cputm;
4461         int rc;
4462
4463         px = kvm_s390_get_prefix(vcpu);
4464         if (gpa == KVM_S390_STORE_STATUS_NOADDR) {
4465                 if (write_guest_abs(vcpu, 163, &archmode, 1))
4466                         return -EFAULT;
4467                 gpa = 0;
4468         } else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) {
4469                 if (write_guest_real(vcpu, 163, &archmode, 1))
4470                         return -EFAULT;
4471                 gpa = px;
4472         } else
4473                 gpa -= __LC_FPREGS_SAVE_AREA;
4474
4475         /* manually convert vector registers if necessary */
4476         if (MACHINE_HAS_VX) {
4477                 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
4478                 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
4479                                      fprs, 128);
4480         } else {
4481                 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
4482                                      vcpu->run->s.regs.fprs, 128);
4483         }
4484         rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA,
4485                               vcpu->run->s.regs.gprs, 128);
4486         rc |= write_guest_abs(vcpu, gpa + __LC_PSW_SAVE_AREA,
4487                               &vcpu->arch.sie_block->gpsw, 16);
4488         rc |= write_guest_abs(vcpu, gpa + __LC_PREFIX_SAVE_AREA,
4489                               &px, 4);
4490         rc |= write_guest_abs(vcpu, gpa + __LC_FP_CREG_SAVE_AREA,
4491                               &vcpu->run->s.regs.fpc, 4);
4492         rc |= write_guest_abs(vcpu, gpa + __LC_TOD_PROGREG_SAVE_AREA,
4493                               &vcpu->arch.sie_block->todpr, 4);
4494         cputm = kvm_s390_get_cpu_timer(vcpu);
4495         rc |= write_guest_abs(vcpu, gpa + __LC_CPU_TIMER_SAVE_AREA,
4496                               &cputm, 8);
4497         clkcomp = vcpu->arch.sie_block->ckc >> 8;
4498         rc |= write_guest_abs(vcpu, gpa + __LC_CLOCK_COMP_SAVE_AREA,
4499                               &clkcomp, 8);
4500         rc |= write_guest_abs(vcpu, gpa + __LC_AREGS_SAVE_AREA,
4501                               &vcpu->run->s.regs.acrs, 64);
4502         rc |= write_guest_abs(vcpu, gpa + __LC_CREGS_SAVE_AREA,
4503                               &vcpu->arch.sie_block->gcr, 128);
4504         return rc ? -EFAULT : 0;
4505 }
4506
4507 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
4508 {
4509         /*
4510          * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy
4511          * switch in the run ioctl. Let's update our copies before we save
4512          * it into the save area
4513          */
4514         save_fpu_regs();
4515         vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
4516         save_access_regs(vcpu->run->s.regs.acrs);
4517
4518         return kvm_s390_store_status_unloaded(vcpu, addr);
4519 }
4520
4521 static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
4522 {
4523         kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu);
4524         kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu);
4525 }
4526
4527 static void __disable_ibs_on_all_vcpus(struct kvm *kvm)
4528 {
4529         unsigned int i;
4530         struct kvm_vcpu *vcpu;
4531
4532         kvm_for_each_vcpu(i, vcpu, kvm) {
4533                 __disable_ibs_on_vcpu(vcpu);
4534         }
4535 }
4536
4537 static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
4538 {
4539         if (!sclp.has_ibs)
4540                 return;
4541         kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu);
4542         kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu);
4543 }
4544
4545 int kvm_s390_vcpu_start(struct kvm_vcpu *vcpu)
4546 {
4547         int i, online_vcpus, r = 0, started_vcpus = 0;
4548
4549         if (!is_vcpu_stopped(vcpu))
4550                 return 0;
4551
4552         trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1);
4553         /* Only one cpu at a time may enter/leave the STOPPED state. */
4554         spin_lock(&vcpu->kvm->arch.start_stop_lock);
4555         online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
4556
4557         /* Let's tell the UV that we want to change into the operating state */
4558         if (kvm_s390_pv_cpu_is_protected(vcpu)) {
4559                 r = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR);
4560                 if (r) {
4561                         spin_unlock(&vcpu->kvm->arch.start_stop_lock);
4562                         return r;
4563                 }
4564         }
4565
4566         for (i = 0; i < online_vcpus; i++) {
4567                 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i]))
4568                         started_vcpus++;
4569         }
4570
4571         if (started_vcpus == 0) {
4572                 /* we're the only active VCPU -> speed it up */
4573                 __enable_ibs_on_vcpu(vcpu);
4574         } else if (started_vcpus == 1) {
4575                 /*
4576                  * As we are starting a second VCPU, we have to disable
4577                  * the IBS facility on all VCPUs to remove potentially
4578                  * outstanding ENABLE requests.
4579                  */
4580                 __disable_ibs_on_all_vcpus(vcpu->kvm);
4581         }
4582
4583         kvm_s390_clear_cpuflags(vcpu, CPUSTAT_STOPPED);
4584         /*
4585          * The real PSW might have changed due to a RESTART interpreted by the
4586          * ultravisor. We block all interrupts and let the next sie exit
4587          * refresh our view.
4588          */
4589         if (kvm_s390_pv_cpu_is_protected(vcpu))
4590                 vcpu->arch.sie_block->gpsw.mask &= ~PSW_INT_MASK;
4591         /*
4592          * Another VCPU might have used IBS while we were offline.
4593          * Let's play safe and flush the VCPU at startup.
4594          */
4595         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
4596         spin_unlock(&vcpu->kvm->arch.start_stop_lock);
4597         return 0;
4598 }
4599
4600 int kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu)
4601 {
4602         int i, online_vcpus, r = 0, started_vcpus = 0;
4603         struct kvm_vcpu *started_vcpu = NULL;
4604
4605         if (is_vcpu_stopped(vcpu))
4606                 return 0;
4607
4608         trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0);
4609         /* Only one cpu at a time may enter/leave the STOPPED state. */
4610         spin_lock(&vcpu->kvm->arch.start_stop_lock);
4611         online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
4612
4613         /* Let's tell the UV that we want to change into the stopped state */
4614         if (kvm_s390_pv_cpu_is_protected(vcpu)) {
4615                 r = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_STP);
4616                 if (r) {
4617                         spin_unlock(&vcpu->kvm->arch.start_stop_lock);
4618                         return r;
4619                 }
4620         }
4621
4622         /* SIGP STOP and SIGP STOP AND STORE STATUS has been fully processed */
4623         kvm_s390_clear_stop_irq(vcpu);
4624
4625         kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOPPED);
4626         __disable_ibs_on_vcpu(vcpu);
4627
4628         for (i = 0; i < online_vcpus; i++) {
4629                 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i])) {
4630                         started_vcpus++;
4631                         started_vcpu = vcpu->kvm->vcpus[i];
4632                 }
4633         }
4634
4635         if (started_vcpus == 1) {
4636                 /*
4637                  * As we only have one VCPU left, we want to enable the
4638                  * IBS facility for that VCPU to speed it up.
4639                  */
4640                 __enable_ibs_on_vcpu(started_vcpu);
4641         }
4642
4643         spin_unlock(&vcpu->kvm->arch.start_stop_lock);
4644         return 0;
4645 }
4646
4647 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
4648                                      struct kvm_enable_cap *cap)
4649 {
4650         int r;
4651
4652         if (cap->flags)
4653                 return -EINVAL;
4654
4655         switch (cap->cap) {
4656         case KVM_CAP_S390_CSS_SUPPORT:
4657                 if (!vcpu->kvm->arch.css_support) {
4658                         vcpu->kvm->arch.css_support = 1;
4659                         VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support");
4660                         trace_kvm_s390_enable_css(vcpu->kvm);
4661                 }
4662                 r = 0;
4663                 break;
4664         default:
4665                 r = -EINVAL;
4666                 break;
4667         }
4668         return r;
4669 }
4670
4671 static long kvm_s390_guest_sida_op(struct kvm_vcpu *vcpu,
4672                                    struct kvm_s390_mem_op *mop)
4673 {
4674         void __user *uaddr = (void __user *)mop->buf;
4675         int r = 0;
4676
4677         if (mop->flags || !mop->size)
4678                 return -EINVAL;
4679         if (mop->size + mop->sida_offset < mop->size)
4680                 return -EINVAL;
4681         if (mop->size + mop->sida_offset > sida_size(vcpu->arch.sie_block))
4682                 return -E2BIG;
4683
4684         switch (mop->op) {
4685         case KVM_S390_MEMOP_SIDA_READ:
4686                 if (copy_to_user(uaddr, (void *)(sida_origin(vcpu->arch.sie_block) +
4687                                  mop->sida_offset), mop->size))
4688                         r = -EFAULT;
4689
4690                 break;
4691         case KVM_S390_MEMOP_SIDA_WRITE:
4692                 if (copy_from_user((void *)(sida_origin(vcpu->arch.sie_block) +
4693                                    mop->sida_offset), uaddr, mop->size))
4694                         r = -EFAULT;
4695                 break;
4696         }
4697         return r;
4698 }
4699 static long kvm_s390_guest_mem_op(struct kvm_vcpu *vcpu,
4700                                   struct kvm_s390_mem_op *mop)
4701 {
4702         void __user *uaddr = (void __user *)mop->buf;
4703         void *tmpbuf = NULL;
4704         int r = 0;
4705         const u64 supported_flags = KVM_S390_MEMOP_F_INJECT_EXCEPTION
4706                                     | KVM_S390_MEMOP_F_CHECK_ONLY;
4707
4708         if (mop->flags & ~supported_flags || mop->ar >= NUM_ACRS || !mop->size)
4709                 return -EINVAL;
4710
4711         if (mop->size > MEM_OP_MAX_SIZE)
4712                 return -E2BIG;
4713
4714         if (kvm_s390_pv_cpu_is_protected(vcpu))
4715                 return -EINVAL;
4716
4717         if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) {
4718                 tmpbuf = vmalloc(mop->size);
4719                 if (!tmpbuf)
4720                         return -ENOMEM;
4721         }
4722
4723         switch (mop->op) {
4724         case KVM_S390_MEMOP_LOGICAL_READ:
4725                 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
4726                         r = check_gva_range(vcpu, mop->gaddr, mop->ar,
4727                                             mop->size, GACC_FETCH);
4728                         break;
4729                 }
4730                 r = read_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size);
4731                 if (r == 0) {
4732                         if (copy_to_user(uaddr, tmpbuf, mop->size))
4733                                 r = -EFAULT;
4734                 }
4735                 break;
4736         case KVM_S390_MEMOP_LOGICAL_WRITE:
4737                 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
4738                         r = check_gva_range(vcpu, mop->gaddr, mop->ar,
4739                                             mop->size, GACC_STORE);
4740                         break;
4741                 }
4742                 if (copy_from_user(tmpbuf, uaddr, mop->size)) {
4743                         r = -EFAULT;
4744                         break;
4745                 }
4746                 r = write_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size);
4747                 break;
4748         }
4749
4750         if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0)
4751                 kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
4752
4753         vfree(tmpbuf);
4754         return r;
4755 }
4756
4757 static long kvm_s390_guest_memsida_op(struct kvm_vcpu *vcpu,
4758                                       struct kvm_s390_mem_op *mop)
4759 {
4760         int r, srcu_idx;
4761
4762         srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
4763
4764         switch (mop->op) {
4765         case KVM_S390_MEMOP_LOGICAL_READ:
4766         case KVM_S390_MEMOP_LOGICAL_WRITE:
4767                 r = kvm_s390_guest_mem_op(vcpu, mop);
4768                 break;
4769         case KVM_S390_MEMOP_SIDA_READ:
4770         case KVM_S390_MEMOP_SIDA_WRITE:
4771                 /* we are locked against sida going away by the vcpu->mutex */
4772                 r = kvm_s390_guest_sida_op(vcpu, mop);
4773                 break;
4774         default:
4775                 r = -EINVAL;
4776         }
4777
4778         srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
4779         return r;
4780 }
4781
4782 long kvm_arch_vcpu_async_ioctl(struct file *filp,
4783                                unsigned int ioctl, unsigned long arg)
4784 {
4785         struct kvm_vcpu *vcpu = filp->private_data;
4786         void __user *argp = (void __user *)arg;
4787
4788         switch (ioctl) {
4789         case KVM_S390_IRQ: {
4790                 struct kvm_s390_irq s390irq;
4791
4792                 if (copy_from_user(&s390irq, argp, sizeof(s390irq)))
4793                         return -EFAULT;
4794                 return kvm_s390_inject_vcpu(vcpu, &s390irq);
4795         }
4796         case KVM_S390_INTERRUPT: {
4797                 struct kvm_s390_interrupt s390int;
4798                 struct kvm_s390_irq s390irq = {};
4799
4800                 if (copy_from_user(&s390int, argp, sizeof(s390int)))
4801                         return -EFAULT;
4802                 if (s390int_to_s390irq(&s390int, &s390irq))
4803                         return -EINVAL;
4804                 return kvm_s390_inject_vcpu(vcpu, &s390irq);
4805         }
4806         }
4807         return -ENOIOCTLCMD;
4808 }
4809
4810 long kvm_arch_vcpu_ioctl(struct file *filp,
4811                          unsigned int ioctl, unsigned long arg)
4812 {
4813         struct kvm_vcpu *vcpu = filp->private_data;
4814         void __user *argp = (void __user *)arg;
4815         int idx;
4816         long r;
4817         u16 rc, rrc;
4818
4819         vcpu_load(vcpu);
4820
4821         switch (ioctl) {
4822         case KVM_S390_STORE_STATUS:
4823                 idx = srcu_read_lock(&vcpu->kvm->srcu);
4824                 r = kvm_s390_store_status_unloaded(vcpu, arg);
4825                 srcu_read_unlock(&vcpu->kvm->srcu, idx);
4826                 break;
4827         case KVM_S390_SET_INITIAL_PSW: {
4828                 psw_t psw;
4829
4830                 r = -EFAULT;
4831                 if (copy_from_user(&psw, argp, sizeof(psw)))
4832                         break;
4833                 r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
4834                 break;
4835         }
4836         case KVM_S390_CLEAR_RESET:
4837                 r = 0;
4838                 kvm_arch_vcpu_ioctl_clear_reset(vcpu);
4839                 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
4840                         r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu),
4841                                           UVC_CMD_CPU_RESET_CLEAR, &rc, &rrc);
4842                         VCPU_EVENT(vcpu, 3, "PROTVIRT RESET CLEAR VCPU: rc %x rrc %x",
4843                                    rc, rrc);
4844                 }
4845                 break;
4846         case KVM_S390_INITIAL_RESET:
4847                 r = 0;
4848                 kvm_arch_vcpu_ioctl_initial_reset(vcpu);
4849                 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
4850                         r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu),
4851                                           UVC_CMD_CPU_RESET_INITIAL,
4852                                           &rc, &rrc);
4853                         VCPU_EVENT(vcpu, 3, "PROTVIRT RESET INITIAL VCPU: rc %x rrc %x",
4854                                    rc, rrc);
4855                 }
4856                 break;
4857         case KVM_S390_NORMAL_RESET:
4858                 r = 0;
4859                 kvm_arch_vcpu_ioctl_normal_reset(vcpu);
4860                 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
4861                         r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu),
4862                                           UVC_CMD_CPU_RESET, &rc, &rrc);
4863                         VCPU_EVENT(vcpu, 3, "PROTVIRT RESET NORMAL VCPU: rc %x rrc %x",
4864                                    rc, rrc);
4865                 }
4866                 break;
4867         case KVM_SET_ONE_REG:
4868         case KVM_GET_ONE_REG: {
4869                 struct kvm_one_reg reg;
4870                 r = -EINVAL;
4871                 if (kvm_s390_pv_cpu_is_protected(vcpu))
4872                         break;
4873                 r = -EFAULT;
4874                 if (copy_from_user(&reg, argp, sizeof(reg)))
4875                         break;
4876                 if (ioctl == KVM_SET_ONE_REG)
4877                         r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, &reg);
4878                 else
4879                         r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, &reg);
4880                 break;
4881         }
4882 #ifdef CONFIG_KVM_S390_UCONTROL
4883         case KVM_S390_UCAS_MAP: {
4884                 struct kvm_s390_ucas_mapping ucasmap;
4885
4886                 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
4887                         r = -EFAULT;
4888                         break;
4889                 }
4890
4891                 if (!kvm_is_ucontrol(vcpu->kvm)) {
4892                         r = -EINVAL;
4893                         break;
4894                 }
4895
4896                 r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr,
4897                                      ucasmap.vcpu_addr, ucasmap.length);
4898                 break;
4899         }
4900         case KVM_S390_UCAS_UNMAP: {
4901                 struct kvm_s390_ucas_mapping ucasmap;
4902
4903                 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
4904                         r = -EFAULT;
4905                         break;
4906                 }
4907
4908                 if (!kvm_is_ucontrol(vcpu->kvm)) {
4909                         r = -EINVAL;
4910                         break;
4911                 }
4912
4913                 r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr,
4914                         ucasmap.length);
4915                 break;
4916         }
4917 #endif
4918         case KVM_S390_VCPU_FAULT: {
4919                 r = gmap_fault(vcpu->arch.gmap, arg, 0);
4920                 break;
4921         }
4922         case KVM_ENABLE_CAP:
4923         {
4924                 struct kvm_enable_cap cap;
4925                 r = -EFAULT;
4926                 if (copy_from_user(&cap, argp, sizeof(cap)))
4927                         break;
4928                 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
4929                 break;
4930         }
4931         case KVM_S390_MEM_OP: {
4932                 struct kvm_s390_mem_op mem_op;
4933
4934                 if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0)
4935                         r = kvm_s390_guest_memsida_op(vcpu, &mem_op);
4936                 else
4937                         r = -EFAULT;
4938                 break;
4939         }
4940         case KVM_S390_SET_IRQ_STATE: {
4941                 struct kvm_s390_irq_state irq_state;
4942
4943                 r = -EFAULT;
4944                 if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
4945                         break;
4946                 if (irq_state.len > VCPU_IRQS_MAX_BUF ||
4947                     irq_state.len == 0 ||
4948                     irq_state.len % sizeof(struct kvm_s390_irq) > 0) {
4949                         r = -EINVAL;
4950                         break;
4951                 }
4952                 /* do not use irq_state.flags, it will break old QEMUs */
4953                 r = kvm_s390_set_irq_state(vcpu,
4954                                            (void __user *) irq_state.buf,
4955                                            irq_state.len);
4956                 break;
4957         }
4958         case KVM_S390_GET_IRQ_STATE: {
4959                 struct kvm_s390_irq_state irq_state;
4960
4961                 r = -EFAULT;
4962                 if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
4963                         break;
4964                 if (irq_state.len == 0) {
4965                         r = -EINVAL;
4966                         break;
4967                 }
4968                 /* do not use irq_state.flags, it will break old QEMUs */
4969                 r = kvm_s390_get_irq_state(vcpu,
4970                                            (__u8 __user *)  irq_state.buf,
4971                                            irq_state.len);
4972                 break;
4973         }
4974         default:
4975                 r = -ENOTTY;
4976         }
4977
4978         vcpu_put(vcpu);
4979         return r;
4980 }
4981
4982 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
4983 {
4984 #ifdef CONFIG_KVM_S390_UCONTROL
4985         if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET)
4986                  && (kvm_is_ucontrol(vcpu->kvm))) {
4987                 vmf->page = virt_to_page(vcpu->arch.sie_block);
4988                 get_page(vmf->page);
4989                 return 0;
4990         }
4991 #endif
4992         return VM_FAULT_SIGBUS;
4993 }
4994
4995 /* Section: memory related */
4996 int kvm_arch_prepare_memory_region(struct kvm *kvm,
4997                                    struct kvm_memory_slot *memslot,
4998                                    const struct kvm_userspace_memory_region *mem,
4999                                    enum kvm_mr_change change)
5000 {
5001         /* A few sanity checks. We can have memory slots which have to be
5002            located/ended at a segment boundary (1MB). The memory in userland is
5003            ok to be fragmented into various different vmas. It is okay to mmap()
5004            and munmap() stuff in this slot after doing this call at any time */
5005
5006         if (mem->userspace_addr & 0xffffful)
5007                 return -EINVAL;
5008
5009         if (mem->memory_size & 0xffffful)
5010                 return -EINVAL;
5011
5012         if (mem->guest_phys_addr + mem->memory_size > kvm->arch.mem_limit)
5013                 return -EINVAL;
5014
5015         /* When we are protected, we should not change the memory slots */
5016         if (kvm_s390_pv_get_handle(kvm))
5017                 return -EINVAL;
5018         return 0;
5019 }
5020
5021 void kvm_arch_commit_memory_region(struct kvm *kvm,
5022                                 const struct kvm_userspace_memory_region *mem,
5023                                 struct kvm_memory_slot *old,
5024                                 const struct kvm_memory_slot *new,
5025                                 enum kvm_mr_change change)
5026 {
5027         int rc = 0;
5028
5029         switch (change) {
5030         case KVM_MR_DELETE:
5031                 rc = gmap_unmap_segment(kvm->arch.gmap, old->base_gfn * PAGE_SIZE,
5032                                         old->npages * PAGE_SIZE);
5033                 break;
5034         case KVM_MR_MOVE:
5035                 rc = gmap_unmap_segment(kvm->arch.gmap, old->base_gfn * PAGE_SIZE,
5036                                         old->npages * PAGE_SIZE);
5037                 if (rc)
5038                         break;
5039                 fallthrough;
5040         case KVM_MR_CREATE:
5041                 rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr,
5042                                       mem->guest_phys_addr, mem->memory_size);
5043                 break;
5044         case KVM_MR_FLAGS_ONLY:
5045                 break;
5046         default:
5047                 WARN(1, "Unknown KVM MR CHANGE: %d\n", change);
5048         }
5049         if (rc)
5050                 pr_warn("failed to commit memory region\n");
5051         return;
5052 }
5053
5054 static inline unsigned long nonhyp_mask(int i)
5055 {
5056         unsigned int nonhyp_fai = (sclp.hmfai << i * 2) >> 30;
5057
5058         return 0x0000ffffffffffffUL >> (nonhyp_fai << 4);
5059 }
5060
5061 void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu)
5062 {
5063         vcpu->valid_wakeup = false;
5064 }
5065
5066 static int __init kvm_s390_init(void)
5067 {
5068         int i;
5069
5070         if (!sclp.has_sief2) {
5071                 pr_info("SIE is not available\n");
5072                 return -ENODEV;
5073         }
5074
5075         if (nested && hpage) {
5076                 pr_info("A KVM host that supports nesting cannot back its KVM guests with huge pages\n");
5077                 return -EINVAL;
5078         }
5079
5080         for (i = 0; i < 16; i++)
5081                 kvm_s390_fac_base[i] |=
5082                         stfle_fac_list[i] & nonhyp_mask(i);
5083
5084         return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
5085 }
5086
5087 static void __exit kvm_s390_exit(void)
5088 {
5089         kvm_exit();
5090 }
5091
5092 module_init(kvm_s390_init);
5093 module_exit(kvm_s390_exit);
5094
5095 /*
5096  * Enable autoloading of the kvm module.
5097  * Note that we add the module alias here instead of virt/kvm/kvm_main.c
5098  * since x86 takes a different approach.
5099  */
5100 #include <linux/miscdevice.h>
5101 MODULE_ALIAS_MISCDEV(KVM_MINOR);
5102 MODULE_ALIAS("devname:kvm");