arch/s390/kvm/kvm-s390.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * hosting IBM Z kernel virtual machines (s390x)
   4  *
   5  * Copyright IBM Corp. 2008, 2018
   6  *
   7  *    Author(s): Carsten Otte <cotte@de.ibm.com>
   8  *               Christian Borntraeger <borntraeger@de.ibm.com>
   9  *               Heiko Carstens <heiko.carstens@de.ibm.com>
  10  *               Christian Ehrhardt <ehrhardt@de.ibm.com>
  11  *               Jason J. Herne <jjherne@us.ibm.com>
  12  */
  13
  14 #define KMSG_COMPONENT "kvm-s390"
  15 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  16
  17 #include <linux/compiler.h>
  18 #include <linux/err.h>
  19 #include <linux/fs.h>
  20 #include <linux/hrtimer.h>
  21 #include <linux/init.h>
  22 #include <linux/kvm.h>
  23 #include <linux/kvm_host.h>
  24 #include <linux/mman.h>
  25 #include <linux/module.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/random.h>
  28 #include <linux/slab.h>
  29 #include <linux/timer.h>
  30 #include <linux/vmalloc.h>
  31 #include <linux/bitmap.h>
  32 #include <linux/sched/signal.h>
  33 #include <linux/string.h>
  34
  35 #include <asm/asm-offsets.h>
  36 #include <asm/lowcore.h>
  37 #include <asm/stp.h>
  38 #include <asm/pgtable.h>
  39 #include <asm/gmap.h>
  40 #include <asm/nmi.h>
  41 #include <asm/switch_to.h>
  42 #include <asm/isc.h>
  43 #include <asm/sclp.h>
  44 #include <asm/cpacf.h>
  45 #include <asm/timex.h>
  46 #include <asm/ap.h>
  47 #include "kvm-s390.h"
  48 #include "gaccess.h"
  49
  50 #define CREATE_TRACE_POINTS
  51 #include "trace.h"
  52 #include "trace-s390.h"
  53
  54 #define MEM_OP_MAX_SIZE 65536   /* Maximum transfer size for KVM_S390_MEM_OP */
  55 #define LOCAL_IRQS 32
  56 #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
  57                            (KVM_MAX_VCPUS + LOCAL_IRQS))
  58
  59 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
  60 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
  61
  62 struct kvm_stats_debugfs_item debugfs_entries[] = {
  63         { "userspace_handled", VCPU_STAT(exit_userspace) },
  64         { "exit_null", VCPU_STAT(exit_null) },
  65         { "exit_validity", VCPU_STAT(exit_validity) },
  66         { "exit_stop_request", VCPU_STAT(exit_stop_request) },
  67         { "exit_external_request", VCPU_STAT(exit_external_request) },
  68         { "exit_io_request", VCPU_STAT(exit_io_request) },
  69         { "exit_external_interrupt", VCPU_STAT(exit_external_interrupt) },
  70         { "exit_instruction", VCPU_STAT(exit_instruction) },
  71         { "exit_pei", VCPU_STAT(exit_pei) },
  72         { "exit_program_interruption", VCPU_STAT(exit_program_interruption) },
  73         { "exit_instr_and_program_int", VCPU_STAT(exit_instr_and_program) },
  74         { "exit_operation_exception", VCPU_STAT(exit_operation_exception) },
  75         { "halt_successful_poll", VCPU_STAT(halt_successful_poll) },
  76         { "halt_attempted_poll", VCPU_STAT(halt_attempted_poll) },
  77         { "halt_poll_invalid", VCPU_STAT(halt_poll_invalid) },
  78         { "halt_no_poll_steal", VCPU_STAT(halt_no_poll_steal) },
  79         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
  80         { "instruction_lctlg", VCPU_STAT(instruction_lctlg) },
  81         { "instruction_lctl", VCPU_STAT(instruction_lctl) },
  82         { "instruction_stctl", VCPU_STAT(instruction_stctl) },
  83         { "instruction_stctg", VCPU_STAT(instruction_stctg) },
  84         { "deliver_ckc", VCPU_STAT(deliver_ckc) },
  85         { "deliver_cputm", VCPU_STAT(deliver_cputm) },
  86         { "deliver_emergency_signal", VCPU_STAT(deliver_emergency_signal) },
  87         { "deliver_external_call", VCPU_STAT(deliver_external_call) },
  88         { "deliver_service_signal", VCPU_STAT(deliver_service_signal) },
  89         { "deliver_virtio", VCPU_STAT(deliver_virtio) },
  90         { "deliver_stop_signal", VCPU_STAT(deliver_stop_signal) },
  91         { "deliver_prefix_signal", VCPU_STAT(deliver_prefix_signal) },
  92         { "deliver_restart_signal", VCPU_STAT(deliver_restart_signal) },
  93         { "deliver_program", VCPU_STAT(deliver_program) },
  94         { "deliver_io", VCPU_STAT(deliver_io) },
  95         { "deliver_machine_check", VCPU_STAT(deliver_machine_check) },
  96         { "exit_wait_state", VCPU_STAT(exit_wait_state) },
  97         { "inject_ckc", VCPU_STAT(inject_ckc) },
  98         { "inject_cputm", VCPU_STAT(inject_cputm) },
  99         { "inject_external_call", VCPU_STAT(inject_external_call) },
 100         { "inject_float_mchk", VM_STAT(inject_float_mchk) },
 101         { "inject_emergency_signal", VCPU_STAT(inject_emergency_signal) },
 102         { "inject_io", VM_STAT(inject_io) },
 103         { "inject_mchk", VCPU_STAT(inject_mchk) },
 104         { "inject_pfault_done", VM_STAT(inject_pfault_done) },
 105         { "inject_program", VCPU_STAT(inject_program) },
 106         { "inject_restart", VCPU_STAT(inject_restart) },
 107         { "inject_service_signal", VM_STAT(inject_service_signal) },
 108         { "inject_set_prefix", VCPU_STAT(inject_set_prefix) },
 109         { "inject_stop_signal", VCPU_STAT(inject_stop_signal) },
 110         { "inject_pfault_init", VCPU_STAT(inject_pfault_init) },
 111         { "inject_virtio", VM_STAT(inject_virtio) },
 112         { "instruction_epsw", VCPU_STAT(instruction_epsw) },
 113         { "instruction_gs", VCPU_STAT(instruction_gs) },
 114         { "instruction_io_other", VCPU_STAT(instruction_io_other) },
 115         { "instruction_lpsw", VCPU_STAT(instruction_lpsw) },
 116         { "instruction_lpswe", VCPU_STAT(instruction_lpswe) },
 117         { "instruction_pfmf", VCPU_STAT(instruction_pfmf) },
 118         { "instruction_ptff", VCPU_STAT(instruction_ptff) },
 119         { "instruction_stidp", VCPU_STAT(instruction_stidp) },
 120         { "instruction_sck", VCPU_STAT(instruction_sck) },
 121         { "instruction_sckpf", VCPU_STAT(instruction_sckpf) },
 122         { "instruction_spx", VCPU_STAT(instruction_spx) },
 123         { "instruction_stpx", VCPU_STAT(instruction_stpx) },
 124         { "instruction_stap", VCPU_STAT(instruction_stap) },
 125         { "instruction_iske", VCPU_STAT(instruction_iske) },
 126         { "instruction_ri", VCPU_STAT(instruction_ri) },
 127         { "instruction_rrbe", VCPU_STAT(instruction_rrbe) },
 128         { "instruction_sske", VCPU_STAT(instruction_sske) },
 129         { "instruction_ipte_interlock", VCPU_STAT(instruction_ipte_interlock) },
 130         { "instruction_essa", VCPU_STAT(instruction_essa) },
 131         { "instruction_stsi", VCPU_STAT(instruction_stsi) },
 132         { "instruction_stfl", VCPU_STAT(instruction_stfl) },
 133         { "instruction_tb", VCPU_STAT(instruction_tb) },
 134         { "instruction_tpi", VCPU_STAT(instruction_tpi) },
 135         { "instruction_tprot", VCPU_STAT(instruction_tprot) },
 136         { "instruction_tsch", VCPU_STAT(instruction_tsch) },
 137         { "instruction_sthyi", VCPU_STAT(instruction_sthyi) },
 138         { "instruction_sie", VCPU_STAT(instruction_sie) },
 139         { "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) },
 140         { "instruction_sigp_sense_running", VCPU_STAT(instruction_sigp_sense_running) },
 141         { "instruction_sigp_external_call", VCPU_STAT(instruction_sigp_external_call) },
 142         { "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) },
 143         { "instruction_sigp_cond_emergency", VCPU_STAT(instruction_sigp_cond_emergency) },
 144         { "instruction_sigp_start", VCPU_STAT(instruction_sigp_start) },
 145         { "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) },
 146         { "instruction_sigp_stop_store_status", VCPU_STAT(instruction_sigp_stop_store_status) },
 147         { "instruction_sigp_store_status", VCPU_STAT(instruction_sigp_store_status) },
 148         { "instruction_sigp_store_adtl_status", VCPU_STAT(instruction_sigp_store_adtl_status) },
 149         { "instruction_sigp_set_arch", VCPU_STAT(instruction_sigp_arch) },
 150         { "instruction_sigp_set_prefix", VCPU_STAT(instruction_sigp_prefix) },
 151         { "instruction_sigp_restart", VCPU_STAT(instruction_sigp_restart) },
 152         { "instruction_sigp_cpu_reset", VCPU_STAT(instruction_sigp_cpu_reset) },
 153         { "instruction_sigp_init_cpu_reset", VCPU_STAT(instruction_sigp_init_cpu_reset) },
 154         { "instruction_sigp_unknown", VCPU_STAT(instruction_sigp_unknown) },
 155         { "instruction_diag_10", VCPU_STAT(diagnose_10) },
 156         { "instruction_diag_44", VCPU_STAT(diagnose_44) },
 157         { "instruction_diag_9c", VCPU_STAT(diagnose_9c) },
 158         { "instruction_diag_258", VCPU_STAT(diagnose_258) },
 159         { "instruction_diag_308", VCPU_STAT(diagnose_308) },
 160         { "instruction_diag_500", VCPU_STAT(diagnose_500) },
 161         { "instruction_diag_other", VCPU_STAT(diagnose_other) },
 162         { NULL }
 163 };
 164
 165 struct kvm_s390_tod_clock_ext {
 166         __u8 epoch_idx;
 167         __u64 tod;
 168         __u8 reserved[7];
 169 } __packed;
 170
 171 /* allow nested virtualization in KVM (if enabled by user space) */
 172 static int nested;
 173 module_param(nested, int, S_IRUGO);
 174 MODULE_PARM_DESC(nested, "Nested virtualization support");
 175
 176 /* allow 1m huge page guest backing, if !nested */
 177 static int hpage;
 178 module_param(hpage, int, 0444);
 179 MODULE_PARM_DESC(hpage, "1m huge page backing support");
 180
 181 /* maximum percentage of steal time for polling.  >100 is treated like 100 */
 182 static u8 halt_poll_max_steal = 10;
 183 module_param(halt_poll_max_steal, byte, 0644);
 184 MODULE_PARM_DESC(halt_poll_max_steal, "Maximum percentage of steal time to allow polling");
 185
 186 /*
 187  * For now we handle at most 16 double words as this is what the s390 base
 188  * kernel handles and stores in the prefix page. If we ever need to go beyond
 189  * this, this requires changes to code, but the external uapi can stay.
 190  */
 191 #define SIZE_INTERNAL 16
 192
 193 /*
 194  * Base feature mask that defines default mask for facilities. Consists of the
 195  * defines in FACILITIES_KVM and the non-hypervisor managed bits.
 196  */
 197 static unsigned long kvm_s390_fac_base[SIZE_INTERNAL] = { FACILITIES_KVM };
 198 /*
 199  * Extended feature mask. Consists of the defines in FACILITIES_KVM_CPUMODEL
 200  * and defines the facilities that can be enabled via a cpu model.
 201  */
 202 static unsigned long kvm_s390_fac_ext[SIZE_INTERNAL] = { FACILITIES_KVM_CPUMODEL };
 203
 204 static unsigned long kvm_s390_fac_size(void)
 205 {
 206         BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_MASK_SIZE_U64);
 207         BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_LIST_SIZE_U64);
 208         BUILD_BUG_ON(SIZE_INTERNAL * sizeof(unsigned long) >
 209                 sizeof(S390_lowcore.stfle_fac_list));
 210
 211         return SIZE_INTERNAL;
 212 }
 213
 214 /* available cpu features supported by kvm */
 215 static DECLARE_BITMAP(kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
 216 /* available subfunctions indicated via query / "test bit" */
 217 static struct kvm_s390_vm_cpu_subfunc kvm_s390_available_subfunc;
 218
 219 static struct gmap_notifier gmap_notifier;
 220 static struct gmap_notifier vsie_gmap_notifier;
 221 debug_info_t *kvm_s390_dbf;
 222
 223 /* Section: not file related */
 224 int kvm_arch_hardware_enable(void)
 225 {
 226         /* every s390 is virtualization enabled ;-) */
 227         return 0;
 228 }
 229
 230 int kvm_arch_check_processor_compat(void)
 231 {
 232         return 0;
 233 }
 234
 235 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
 236                               unsigned long end);
 237
 238 static void kvm_clock_sync_scb(struct kvm_s390_sie_block *scb, u64 delta)
 239 {
 240         u8 delta_idx = 0;
 241
 242         /*
 243          * The TOD jumps by delta, we have to compensate this by adding
 244          * -delta to the epoch.
 245          */
 246         delta = -delta;
 247
 248         /* sign-extension - we're adding to signed values below */
 249         if ((s64)delta < 0)
 250                 delta_idx = -1;
 251
 252         scb->epoch += delta;
 253         if (scb->ecd & ECD_MEF) {
 254                 scb->epdx += delta_idx;
 255                 if (scb->epoch < delta)
 256                         scb->epdx += 1;
 257         }
 258 }
 259
 260 /*
 261  * This callback is executed during stop_machine(). All CPUs are therefore
 262  * temporarily stopped. In order not to change guest behavior, we have to
 263  * disable preemption whenever we touch the epoch of kvm and the VCPUs,
 264  * so a CPU won't be stopped while calculating with the epoch.
 265  */
 266 static int kvm_clock_sync(struct notifier_block *notifier, unsigned long val,
 267                           void *v)
 268 {
 269         struct kvm *kvm;
 270         struct kvm_vcpu *vcpu;
 271         int i;
 272         unsigned long long *delta = v;
 273
 274         list_for_each_entry(kvm, &vm_list, vm_list) {
 275                 kvm_for_each_vcpu(i, vcpu, kvm) {
 276                         kvm_clock_sync_scb(vcpu->arch.sie_block, *delta);
 277                         if (i == 0) {
 278                                 kvm->arch.epoch = vcpu->arch.sie_block->epoch;
 279                                 kvm->arch.epdx = vcpu->arch.sie_block->epdx;
 280                         }
 281                         if (vcpu->arch.cputm_enabled)
 282                                 vcpu->arch.cputm_start += *delta;
 283                         if (vcpu->arch.vsie_block)
 284                                 kvm_clock_sync_scb(vcpu->arch.vsie_block,
 285                                                    *delta);
 286                 }
 287         }
 288         return NOTIFY_OK;
 289 }
 290
 291 static struct notifier_block kvm_clock_notifier = {
 292         .notifier_call = kvm_clock_sync,
 293 };
 294
 295 int kvm_arch_hardware_setup(void)
 296 {
 297         gmap_notifier.notifier_call = kvm_gmap_notifier;
 298         gmap_register_pte_notifier(&gmap_notifier);
 299         vsie_gmap_notifier.notifier_call = kvm_s390_vsie_gmap_notifier;
 300         gmap_register_pte_notifier(&vsie_gmap_notifier);
 301         atomic_notifier_chain_register(&s390_epoch_delta_notifier,
 302                                        &kvm_clock_notifier);
 303         return 0;
 304 }
 305
 306 void kvm_arch_hardware_unsetup(void)
 307 {
 308         gmap_unregister_pte_notifier(&gmap_notifier);
 309         gmap_unregister_pte_notifier(&vsie_gmap_notifier);
 310         atomic_notifier_chain_unregister(&s390_epoch_delta_notifier,
 311                                          &kvm_clock_notifier);
 312 }
 313
 314 static void allow_cpu_feat(unsigned long nr)
 315 {
 316         set_bit_inv(nr, kvm_s390_available_cpu_feat);
 317 }
 318
 319 static inline int plo_test_bit(unsigned char nr)
 320 {
 321         register unsigned long r0 asm("0") = (unsigned long) nr | 0x100;
 322         int cc;
 323
 324         asm volatile(
 325                 /* Parameter registers are ignored for "test bit" */
 326                 "       plo     0,0,0,0(0)\n"
 327                 "       ipm     %0\n"
 328                 "       srl     %0,28\n"
 329                 : "=d" (cc)
 330                 : "d" (r0)
 331                 : "cc");
 332         return cc == 0;
 333 }
 334
 335 static inline void __insn32_query(unsigned int opcode, u8 query[32])
 336 {
 337         register unsigned long r0 asm("0") = 0; /* query function */
 338         register unsigned long r1 asm("1") = (unsigned long) query;
 339
 340         asm volatile(
 341                 /* Parameter regs are ignored */
 342                 "       .insn   rrf,%[opc] << 16,2,4,6,0\n"
 343                 : "=m" (*query)
 344                 : "d" (r0), "a" (r1), [opc] "i" (opcode)
 345                 : "cc");
 346 }
 347
 348 #define INSN_SORTL 0xb938
 349 #define INSN_DFLTCC 0xb939
 350
 351 static void kvm_s390_cpu_feat_init(void)
 352 {
 353         int i;
 354
 355         for (i = 0; i < 256; ++i) {
 356                 if (plo_test_bit(i))
 357                         kvm_s390_available_subfunc.plo[i >> 3] |= 0x80 >> (i & 7);
 358         }
 359
 360         if (test_facility(28)) /* TOD-clock steering */
 361                 ptff(kvm_s390_available_subfunc.ptff,
 362                      sizeof(kvm_s390_available_subfunc.ptff),
 363                      PTFF_QAF);
 364
 365         if (test_facility(17)) { /* MSA */
 366                 __cpacf_query(CPACF_KMAC, (cpacf_mask_t *)
 367                               kvm_s390_available_subfunc.kmac);
 368                 __cpacf_query(CPACF_KMC, (cpacf_mask_t *)
 369                               kvm_s390_available_subfunc.kmc);
 370                 __cpacf_query(CPACF_KM, (cpacf_mask_t *)
 371                               kvm_s390_available_subfunc.km);
 372                 __cpacf_query(CPACF_KIMD, (cpacf_mask_t *)
 373                               kvm_s390_available_subfunc.kimd);
 374                 __cpacf_query(CPACF_KLMD, (cpacf_mask_t *)
 375                               kvm_s390_available_subfunc.klmd);
 376         }
 377         if (test_facility(76)) /* MSA3 */
 378                 __cpacf_query(CPACF_PCKMO, (cpacf_mask_t *)
 379                               kvm_s390_available_subfunc.pckmo);
 380         if (test_facility(77)) { /* MSA4 */
 381                 __cpacf_query(CPACF_KMCTR, (cpacf_mask_t *)
 382                               kvm_s390_available_subfunc.kmctr);
 383                 __cpacf_query(CPACF_KMF, (cpacf_mask_t *)
 384                               kvm_s390_available_subfunc.kmf);
 385                 __cpacf_query(CPACF_KMO, (cpacf_mask_t *)
 386                               kvm_s390_available_subfunc.kmo);
 387                 __cpacf_query(CPACF_PCC, (cpacf_mask_t *)
 388                               kvm_s390_available_subfunc.pcc);
 389         }
 390         if (test_facility(57)) /* MSA5 */
 391                 __cpacf_query(CPACF_PRNO, (cpacf_mask_t *)
 392                               kvm_s390_available_subfunc.ppno);
 393
 394         if (test_facility(146)) /* MSA8 */
 395                 __cpacf_query(CPACF_KMA, (cpacf_mask_t *)
 396                               kvm_s390_available_subfunc.kma);
 397
 398         if (test_facility(155)) /* MSA9 */
 399                 __cpacf_query(CPACF_KDSA, (cpacf_mask_t *)
 400                               kvm_s390_available_subfunc.kdsa);
 401
 402         if (test_facility(150)) /* SORTL */
 403                 __insn32_query(INSN_SORTL, kvm_s390_available_subfunc.sortl);
 404
 405         if (test_facility(151)) /* DFLTCC */
 406                 __insn32_query(INSN_DFLTCC, kvm_s390_available_subfunc.dfltcc);
 407
 408         if (MACHINE_HAS_ESOP)
 409                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP);
 410         /*
 411          * We need SIE support, ESOP (PROT_READ protection for gmap_shadow),
 412          * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing).
 413          */
 414         if (!sclp.has_sief2 || !MACHINE_HAS_ESOP || !sclp.has_64bscao ||
 415             !test_facility(3) || !nested)
 416                 return;
 417         allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2);
 418         if (sclp.has_64bscao)
 419                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO);
 420         if (sclp.has_siif)
 421                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF);
 422         if (sclp.has_gpere)
 423                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GPERE);
 424         if (sclp.has_gsls)
 425                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GSLS);
 426         if (sclp.has_ib)
 427                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IB);
 428         if (sclp.has_cei)
 429                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_CEI);
 430         if (sclp.has_ibs)
 431                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IBS);
 432         if (sclp.has_kss)
 433                 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_KSS);
 434         /*
 435          * KVM_S390_VM_CPU_FEAT_SKEY: Wrong shadow of PTE.I bits will make
 436          * all skey handling functions read/set the skey from the PGSTE
 437          * instead of the real storage key.
 438          *
 439          * KVM_S390_VM_CPU_FEAT_CMMA: Wrong shadow of PTE.I bits will make
 440          * pages being detected as preserved although they are resident.
 441          *
 442          * KVM_S390_VM_CPU_FEAT_PFMFI: Wrong shadow of PTE.I bits will
 443          * have the same effect as for KVM_S390_VM_CPU_FEAT_SKEY.
 444          *
 445          * For KVM_S390_VM_CPU_FEAT_SKEY, KVM_S390_VM_CPU_FEAT_CMMA and
 446          * KVM_S390_VM_CPU_FEAT_PFMFI, all PTE.I and PGSTE bits have to be
 447          * correctly shadowed. We can do that for the PGSTE but not for PTE.I.
 448          *
 449          * KVM_S390_VM_CPU_FEAT_SIGPIF: Wrong SCB addresses in the SCA. We
 450          * cannot easily shadow the SCA because of the ipte lock.
 451          */
 452 }
 453
 454 int kvm_arch_init(void *opaque)
 455 {
 456         int rc;
 457
 458         kvm_s390_dbf = debug_register("kvm-trace", 32, 1, 7 * sizeof(long));
 459         if (!kvm_s390_dbf)
 460                 return -ENOMEM;
 461
 462         if (debug_register_view(kvm_s390_dbf, &debug_sprintf_view)) {
 463                 rc = -ENOMEM;
 464                 goto out_debug_unreg;
 465         }
 466
 467         kvm_s390_cpu_feat_init();
 468
 469         /* Register floating interrupt controller interface. */
 470         rc = kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC);
 471         if (rc) {
 472                 pr_err("A FLIC registration call failed with rc=%d\n", rc);
 473                 goto out_debug_unreg;
 474         }
 475
 476         rc = kvm_s390_gib_init(GAL_ISC);
 477         if (rc)
 478                 goto out_gib_destroy;
 479
 480         return 0;
 481
 482 out_gib_destroy:
 483         kvm_s390_gib_destroy();
 484 out_debug_unreg:
 485         debug_unregister(kvm_s390_dbf);
 486         return rc;
 487 }
 488
 489 void kvm_arch_exit(void)
 490 {
 491         kvm_s390_gib_destroy();
 492         debug_unregister(kvm_s390_dbf);
 493 }
 494
 495 /* Section: device related */
 496 long kvm_arch_dev_ioctl(struct file *filp,
 497                         unsigned int ioctl, unsigned long arg)
 498 {
 499         if (ioctl == KVM_S390_ENABLE_SIE)
 500                 return s390_enable_sie();
 501         return -EINVAL;
 502 }
 503
 504 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 505 {
 506         int r;
 507
 508         switch (ext) {
 509         case KVM_CAP_S390_PSW:
 510         case KVM_CAP_S390_GMAP:
 511         case KVM_CAP_SYNC_MMU:
 512 #ifdef CONFIG_KVM_S390_UCONTROL
 513         case KVM_CAP_S390_UCONTROL:
 514 #endif
 515         case KVM_CAP_ASYNC_PF:
 516         case KVM_CAP_SYNC_REGS:
 517         case KVM_CAP_ONE_REG:
 518         case KVM_CAP_ENABLE_CAP:
 519         case KVM_CAP_S390_CSS_SUPPORT:
 520         case KVM_CAP_IOEVENTFD:
 521         case KVM_CAP_DEVICE_CTRL:
 522         case KVM_CAP_S390_IRQCHIP:
 523         case KVM_CAP_VM_ATTRIBUTES:
 524         case KVM_CAP_MP_STATE:
 525         case KVM_CAP_IMMEDIATE_EXIT:
 526         case KVM_CAP_S390_INJECT_IRQ:
 527         case KVM_CAP_S390_USER_SIGP:
 528         case KVM_CAP_S390_USER_STSI:
 529         case KVM_CAP_S390_SKEYS:
 530         case KVM_CAP_S390_IRQ_STATE:
 531         case KVM_CAP_S390_USER_INSTR0:
 532         case KVM_CAP_S390_CMMA_MIGRATION:
 533         case KVM_CAP_S390_AIS:
 534         case KVM_CAP_S390_AIS_MIGRATION:
 535                 r = 1;
 536                 break;
 537         case KVM_CAP_S390_HPAGE_1M:
 538                 r = 0;
 539                 if (hpage && !kvm_is_ucontrol(kvm))
 540                         r = 1;
 541                 break;
 542         case KVM_CAP_S390_MEM_OP:
 543                 r = MEM_OP_MAX_SIZE;
 544                 break;
 545         case KVM_CAP_NR_VCPUS:
 546         case KVM_CAP_MAX_VCPUS:
 547         case KVM_CAP_MAX_VCPU_ID:
 548                 r = KVM_S390_BSCA_CPU_SLOTS;
 549                 if (!kvm_s390_use_sca_entries())
 550                         r = KVM_MAX_VCPUS;
 551                 else if (sclp.has_esca && sclp.has_64bscao)
 552                         r = KVM_S390_ESCA_CPU_SLOTS;
 553                 break;
 554         case KVM_CAP_S390_COW:
 555                 r = MACHINE_HAS_ESOP;
 556                 break;
 557         case KVM_CAP_S390_VECTOR_REGISTERS:
 558                 r = MACHINE_HAS_VX;
 559                 break;
 560         case KVM_CAP_S390_RI:
 561                 r = test_facility(64);
 562                 break;
 563         case KVM_CAP_S390_GS:
 564                 r = test_facility(133);
 565                 break;
 566         case KVM_CAP_S390_BPB:
 567                 r = test_facility(82);
 568                 break;
 569         default:
 570                 r = 0;
 571         }
 572         return r;
 573 }
 574
 575 static void kvm_s390_sync_dirty_log(struct kvm *kvm,
 576                                     struct kvm_memory_slot *memslot)
 577 {
 578         int i;
 579         gfn_t cur_gfn, last_gfn;
 580         unsigned long gaddr, vmaddr;
 581         struct gmap *gmap = kvm->arch.gmap;
 582         DECLARE_BITMAP(bitmap, _PAGE_ENTRIES);
 583
 584         /* Loop over all guest segments */
 585         cur_gfn = memslot->base_gfn;
 586         last_gfn = memslot->base_gfn + memslot->npages;
 587         for (; cur_gfn <= last_gfn; cur_gfn += _PAGE_ENTRIES) {
 588                 gaddr = gfn_to_gpa(cur_gfn);
 589                 vmaddr = gfn_to_hva_memslot(memslot, cur_gfn);
 590                 if (kvm_is_error_hva(vmaddr))
 591                         continue;
 592
 593                 bitmap_zero(bitmap, _PAGE_ENTRIES);
 594                 gmap_sync_dirty_log_pmd(gmap, bitmap, gaddr, vmaddr);
 595                 for (i = 0; i < _PAGE_ENTRIES; i++) {
 596                         if (test_bit(i, bitmap))
 597                                 mark_page_dirty(kvm, cur_gfn + i);
 598                 }
 599
 600                 if (fatal_signal_pending(current))
 601                         return;
 602                 cond_resched();
 603         }
 604 }
 605
 606 /* Section: vm related */
 607 static void sca_del_vcpu(struct kvm_vcpu *vcpu);
 608
 609 /*
 610  * Get (and clear) the dirty memory log for a memory slot.
 611  */
 612 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 613                                struct kvm_dirty_log *log)
 614 {
 615         int r;
 616         unsigned long n;
 617         struct kvm_memslots *slots;
 618         struct kvm_memory_slot *memslot;
 619         int is_dirty = 0;
 620
 621         if (kvm_is_ucontrol(kvm))
 622                 return -EINVAL;
 623
 624         mutex_lock(&kvm->slots_lock);
 625
 626         r = -EINVAL;
 627         if (log->slot >= KVM_USER_MEM_SLOTS)
 628                 goto out;
 629
 630         slots = kvm_memslots(kvm);
 631         memslot = id_to_memslot(slots, log->slot);
 632         r = -ENOENT;
 633         if (!memslot->dirty_bitmap)
 634                 goto out;
 635
 636         kvm_s390_sync_dirty_log(kvm, memslot);
 637         r = kvm_get_dirty_log(kvm, log, &is_dirty);
 638         if (r)
 639                 goto out;
 640
 641         /* Clear the dirty log */
 642         if (is_dirty) {
 643                 n = kvm_dirty_bitmap_bytes(memslot);
 644                 memset(memslot->dirty_bitmap, 0, n);
 645         }
 646         r = 0;
 647 out:
 648         mutex_unlock(&kvm->slots_lock);
 649         return r;
 650 }
 651
 652 static void icpt_operexc_on_all_vcpus(struct kvm *kvm)
 653 {
 654         unsigned int i;
 655         struct kvm_vcpu *vcpu;
 656
 657         kvm_for_each_vcpu(i, vcpu, kvm) {
 658                 kvm_s390_sync_request(KVM_REQ_ICPT_OPEREXC, vcpu);
 659         }
 660 }
 661
 662 int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
 663 {
 664         int r;
 665
 666         if (cap->flags)
 667                 return -EINVAL;
 668
 669         switch (cap->cap) {
 670         case KVM_CAP_S390_IRQCHIP:
 671                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP");
 672                 kvm->arch.use_irqchip = 1;
 673                 r = 0;
 674                 break;
 675         case KVM_CAP_S390_USER_SIGP:
 676                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP");
 677                 kvm->arch.user_sigp = 1;
 678                 r = 0;
 679                 break;
 680         case KVM_CAP_S390_VECTOR_REGISTERS:
 681                 mutex_lock(&kvm->lock);
 682                 if (kvm->created_vcpus) {
 683                         r = -EBUSY;
 684                 } else if (MACHINE_HAS_VX) {
 685                         set_kvm_facility(kvm->arch.model.fac_mask, 129);
 686                         set_kvm_facility(kvm->arch.model.fac_list, 129);
 687                         if (test_facility(134)) {
 688                                 set_kvm_facility(kvm->arch.model.fac_mask, 134);
 689                                 set_kvm_facility(kvm->arch.model.fac_list, 134);
 690                         }
 691                         if (test_facility(135)) {
 692                                 set_kvm_facility(kvm->arch.model.fac_mask, 135);
 693                                 set_kvm_facility(kvm->arch.model.fac_list, 135);
 694                         }
 695                         if (test_facility(148)) {
 696                                 set_kvm_facility(kvm->arch.model.fac_mask, 148);
 697                                 set_kvm_facility(kvm->arch.model.fac_list, 148);
 698                         }
 699                         if (test_facility(152)) {
 700                                 set_kvm_facility(kvm->arch.model.fac_mask, 152);
 701                                 set_kvm_facility(kvm->arch.model.fac_list, 152);
 702                         }
 703                         r = 0;
 704                 } else
 705                         r = -EINVAL;
 706                 mutex_unlock(&kvm->lock);
 707                 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s",
 708                          r ? "(not available)" : "(success)");
 709                 break;
 710         case KVM_CAP_S390_RI:
 711                 r = -EINVAL;
 712                 mutex_lock(&kvm->lock);
 713                 if (kvm->created_vcpus) {
 714                         r = -EBUSY;
 715                 } else if (test_facility(64)) {
 716                         set_kvm_facility(kvm->arch.model.fac_mask, 64);
 717                         set_kvm_facility(kvm->arch.model.fac_list, 64);
 718                         r = 0;
 719                 }
 720                 mutex_unlock(&kvm->lock);
 721                 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s",
 722                          r ? "(not available)" : "(success)");
 723                 break;
 724         case KVM_CAP_S390_AIS:
 725                 mutex_lock(&kvm->lock);
 726                 if (kvm->created_vcpus) {
 727                         r = -EBUSY;
 728                 } else {
 729                         set_kvm_facility(kvm->arch.model.fac_mask, 72);
 730                         set_kvm_facility(kvm->arch.model.fac_list, 72);
 731                         r = 0;
 732                 }
 733                 mutex_unlock(&kvm->lock);
 734                 VM_EVENT(kvm, 3, "ENABLE: AIS %s",
 735                          r ? "(not available)" : "(success)");
 736                 break;
 737         case KVM_CAP_S390_GS:
 738                 r = -EINVAL;
 739                 mutex_lock(&kvm->lock);
 740                 if (kvm->created_vcpus) {
 741                         r = -EBUSY;
 742                 } else if (test_facility(133)) {
 743                         set_kvm_facility(kvm->arch.model.fac_mask, 133);
 744                         set_kvm_facility(kvm->arch.model.fac_list, 133);
 745                         r = 0;
 746                 }
 747                 mutex_unlock(&kvm->lock);
 748                 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_GS %s",
 749                          r ? "(not available)" : "(success)");
 750                 break;
 751         case KVM_CAP_S390_HPAGE_1M:
 752                 mutex_lock(&kvm->lock);
 753                 if (kvm->created_vcpus)
 754                         r = -EBUSY;
 755                 else if (!hpage || kvm->arch.use_cmma || kvm_is_ucontrol(kvm))
 756                         r = -EINVAL;
 757                 else {
 758                         r = 0;
 759                         down_write(&kvm->mm->mmap_sem);
 760                         kvm->mm->context.allow_gmap_hpage_1m = 1;
 761                         up_write(&kvm->mm->mmap_sem);
 762                         /*
 763                          * We might have to create fake 4k page
 764                          * tables. To avoid that the hardware works on
 765                          * stale PGSTEs, we emulate these instructions.
 766                          */
 767                         kvm->arch.use_skf = 0;
 768                         kvm->arch.use_pfmfi = 0;
 769                 }
 770                 mutex_unlock(&kvm->lock);
 771                 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_HPAGE %s",
 772                          r ? "(not available)" : "(success)");
 773                 break;
 774         case KVM_CAP_S390_USER_STSI:
 775                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI");
 776                 kvm->arch.user_stsi = 1;
 777                 r = 0;
 778                 break;
 779         case KVM_CAP_S390_USER_INSTR0:
 780                 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_INSTR0");
 781                 kvm->arch.user_instr0 = 1;
 782                 icpt_operexc_on_all_vcpus(kvm);
 783                 r = 0;
 784                 break;
 785         default:
 786                 r = -EINVAL;
 787                 break;
 788         }
 789         return r;
 790 }
 791
 792 static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
 793 {
 794         int ret;
 795
 796         switch (attr->attr) {
 797         case KVM_S390_VM_MEM_LIMIT_SIZE:
 798                 ret = 0;
 799                 VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes",
 800                          kvm->arch.mem_limit);
 801                 if (put_user(kvm->arch.mem_limit, (u64 __user *)attr->addr))
 802                         ret = -EFAULT;
 803                 break;
 804         default:
 805                 ret = -ENXIO;
 806                 break;
 807         }
 808         return ret;
 809 }
 810
 811 static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
 812 {
 813         int ret;
 814         unsigned int idx;
 815         switch (attr->attr) {
 816         case KVM_S390_VM_MEM_ENABLE_CMMA:
 817                 ret = -ENXIO;
 818                 if (!sclp.has_cmma)
 819                         break;
 820
 821                 VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support");
 822                 mutex_lock(&kvm->lock);
 823                 if (kvm->created_vcpus)
 824                         ret = -EBUSY;
 825                 else if (kvm->mm->context.allow_gmap_hpage_1m)
 826                         ret = -EINVAL;
 827                 else {
 828                         kvm->arch.use_cmma = 1;
 829                         /* Not compatible with cmma. */
 830                         kvm->arch.use_pfmfi = 0;
 831                         ret = 0;
 832                 }
 833                 mutex_unlock(&kvm->lock);
 834                 break;
 835         case KVM_S390_VM_MEM_CLR_CMMA:
 836                 ret = -ENXIO;
 837                 if (!sclp.has_cmma)
 838                         break;
 839                 ret = -EINVAL;
 840                 if (!kvm->arch.use_cmma)
 841                         break;
 842
 843                 VM_EVENT(kvm, 3, "%s", "RESET: CMMA states");
 844                 mutex_lock(&kvm->lock);
 845                 idx = srcu_read_lock(&kvm->srcu);
 846                 s390_reset_cmma(kvm->arch.gmap->mm);
 847                 srcu_read_unlock(&kvm->srcu, idx);
 848                 mutex_unlock(&kvm->lock);
 849                 ret = 0;
 850                 break;
 851         case KVM_S390_VM_MEM_LIMIT_SIZE: {
 852                 unsigned long new_limit;
 853
 854                 if (kvm_is_ucontrol(kvm))
 855                         return -EINVAL;
 856
 857                 if (get_user(new_limit, (u64 __user *)attr->addr))
 858                         return -EFAULT;
 859
 860                 if (kvm->arch.mem_limit != KVM_S390_NO_MEM_LIMIT &&
 861                     new_limit > kvm->arch.mem_limit)
 862                         return -E2BIG;
 863
 864                 if (!new_limit)
 865                         return -EINVAL;
 866
 867                 /* gmap_create takes last usable address */
 868                 if (new_limit != KVM_S390_NO_MEM_LIMIT)
 869                         new_limit -= 1;
 870
 871                 ret = -EBUSY;
 872                 mutex_lock(&kvm->lock);
 873                 if (!kvm->created_vcpus) {
 874                         /* gmap_create will round the limit up */
 875                         struct gmap *new = gmap_create(current->mm, new_limit);
 876
 877                         if (!new) {
 878                                 ret = -ENOMEM;
 879                         } else {
 880                                 gmap_remove(kvm->arch.gmap);
 881                                 new->private = kvm;
 882                                 kvm->arch.gmap = new;
 883                                 ret = 0;
 884                         }
 885                 }
 886                 mutex_unlock(&kvm->lock);
 887                 VM_EVENT(kvm, 3, "SET: max guest address: %lu", new_limit);
 888                 VM_EVENT(kvm, 3, "New guest asce: 0x%pK",
 889                          (void *) kvm->arch.gmap->asce);
 890                 break;
 891         }
 892         default:
 893                 ret = -ENXIO;
 894                 break;
 895         }
 896         return ret;
 897 }
 898
 899 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu);
 900
 901 void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm)
 902 {
 903         struct kvm_vcpu *vcpu;
 904         int i;
 905
 906         kvm_s390_vcpu_block_all(kvm);
 907
 908         kvm_for_each_vcpu(i, vcpu, kvm) {
 909                 kvm_s390_vcpu_crypto_setup(vcpu);
 910                 /* recreate the shadow crycb by leaving the VSIE handler */
 911                 kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu);
 912         }
 913
 914         kvm_s390_vcpu_unblock_all(kvm);
 915 }
 916
 917 static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
 918 {
 919         mutex_lock(&kvm->lock);
 920         switch (attr->attr) {
 921         case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
 922                 if (!test_kvm_facility(kvm, 76)) {
 923                         mutex_unlock(&kvm->lock);
 924                         return -EINVAL;
 925                 }
 926                 get_random_bytes(
 927                         kvm->arch.crypto.crycb->aes_wrapping_key_mask,
 928                         sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
 929                 kvm->arch.crypto.aes_kw = 1;
 930                 VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support");
 931                 break;
 932         case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
 933                 if (!test_kvm_facility(kvm, 76)) {
 934                         mutex_unlock(&kvm->lock);
 935                         return -EINVAL;
 936                 }
 937                 get_random_bytes(
 938                         kvm->arch.crypto.crycb->dea_wrapping_key_mask,
 939                         sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
 940                 kvm->arch.crypto.dea_kw = 1;
 941                 VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support");
 942                 break;
 943         case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
 944                 if (!test_kvm_facility(kvm, 76)) {
 945                         mutex_unlock(&kvm->lock);
 946                         return -EINVAL;
 947                 }
 948                 kvm->arch.crypto.aes_kw = 0;
 949                 memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0,
 950                         sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
 951                 VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support");
 952                 break;
 953         case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
 954                 if (!test_kvm_facility(kvm, 76)) {
 955                         mutex_unlock(&kvm->lock);
 956                         return -EINVAL;
 957                 }
 958                 kvm->arch.crypto.dea_kw = 0;
 959                 memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0,
 960                         sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
 961                 VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support");
 962                 break;
 963         case KVM_S390_VM_CRYPTO_ENABLE_APIE:
 964                 if (!ap_instructions_available()) {
 965                         mutex_unlock(&kvm->lock);
 966                         return -EOPNOTSUPP;
 967                 }
 968                 kvm->arch.crypto.apie = 1;
 969                 break;
 970         case KVM_S390_VM_CRYPTO_DISABLE_APIE:
 971                 if (!ap_instructions_available()) {
 972                         mutex_unlock(&kvm->lock);
 973                         return -EOPNOTSUPP;
 974                 }
 975                 kvm->arch.crypto.apie = 0;
 976                 break;
 977         default:
 978                 mutex_unlock(&kvm->lock);
 979                 return -ENXIO;
 980         }
 981
 982         kvm_s390_vcpu_crypto_reset_all(kvm);
 983         mutex_unlock(&kvm->lock);
 984         return 0;
 985 }
 986
 987 static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req)
 988 {
 989         int cx;
 990         struct kvm_vcpu *vcpu;
 991
 992         kvm_for_each_vcpu(cx, vcpu, kvm)
 993                 kvm_s390_sync_request(req, vcpu);
 994 }
 995
 996 /*
 997  * Must be called with kvm->srcu held to avoid races on memslots, and with
 998  * kvm->slots_lock to avoid races with ourselves and kvm_s390_vm_stop_migration.
 999  */
1000 static int kvm_s390_vm_start_migration(struct kvm *kvm)
1001 {
1002         struct kvm_memory_slot *ms;
1003         struct kvm_memslots *slots;
1004         unsigned long ram_pages = 0;
1005         int slotnr;
1006
1007         /* migration mode already enabled */
1008         if (kvm->arch.migration_mode)
1009                 return 0;
1010         slots = kvm_memslots(kvm);
1011         if (!slots || !slots->used_slots)
1012                 return -EINVAL;
1013
1014         if (!kvm->arch.use_cmma) {
1015                 kvm->arch.migration_mode = 1;
1016                 return 0;
1017         }
1018         /* mark all the pages in active slots as dirty */
1019         for (slotnr = 0; slotnr < slots->used_slots; slotnr++) {
1020                 ms = slots->memslots + slotnr;
1021                 /*
1022                  * The second half of the bitmap is only used on x86,
1023                  * and would be wasted otherwise, so we put it to good
1024                  * use here to keep track of the state of the storage
1025                  * attributes.
1026                  */
1027                 memset(kvm_second_dirty_bitmap(ms), 0xff, kvm_dirty_bitmap_bytes(ms));
1028                 ram_pages += ms->npages;
1029         }
1030         atomic64_set(&kvm->arch.cmma_dirty_pages, ram_pages);
1031         kvm->arch.migration_mode = 1;
1032         kvm_s390_sync_request_broadcast(kvm, KVM_REQ_START_MIGRATION);
1033         return 0;
1034 }
1035
1036 /*
1037  * Must be called with kvm->slots_lock to avoid races with ourselves and
1038  * kvm_s390_vm_start_migration.
1039  */
1040 static int kvm_s390_vm_stop_migration(struct kvm *kvm)
1041 {
1042         /* migration mode already disabled */
1043         if (!kvm->arch.migration_mode)
1044                 return 0;
1045         kvm->arch.migration_mode = 0;
1046         if (kvm->arch.use_cmma)
1047                 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_STOP_MIGRATION);
1048         return 0;
1049 }
1050
1051 static int kvm_s390_vm_set_migration(struct kvm *kvm,
1052                                      struct kvm_device_attr *attr)
1053 {
1054         int res = -ENXIO;
1055
1056         mutex_lock(&kvm->slots_lock);
1057         switch (attr->attr) {
1058         case KVM_S390_VM_MIGRATION_START:
1059                 res = kvm_s390_vm_start_migration(kvm);
1060                 break;
1061         case KVM_S390_VM_MIGRATION_STOP:
1062                 res = kvm_s390_vm_stop_migration(kvm);
1063                 break;
1064         default:
1065                 break;
1066         }
1067         mutex_unlock(&kvm->slots_lock);
1068
1069         return res;
1070 }
1071
1072 static int kvm_s390_vm_get_migration(struct kvm *kvm,
1073                                      struct kvm_device_attr *attr)
1074 {
1075         u64 mig = kvm->arch.migration_mode;
1076
1077         if (attr->attr != KVM_S390_VM_MIGRATION_STATUS)
1078                 return -ENXIO;
1079
1080         if (copy_to_user((void __user *)attr->addr, &mig, sizeof(mig)))
1081                 return -EFAULT;
1082         return 0;
1083 }
1084
1085 static int kvm_s390_set_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
1086 {
1087         struct kvm_s390_vm_tod_clock gtod;
1088
1089         if (copy_from_user(&gtod, (void __user *)attr->addr, sizeof(gtod)))
1090                 return -EFAULT;
1091
1092         if (!test_kvm_facility(kvm, 139) && gtod.epoch_idx)
1093                 return -EINVAL;
1094         kvm_s390_set_tod_clock(kvm, &gtod);
1095
1096         VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x, TOD base: 0x%llx",
1097                 gtod.epoch_idx, gtod.tod);
1098
1099         return 0;
1100 }
1101
1102 static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
1103 {
1104         u8 gtod_high;
1105
1106         if (copy_from_user(&gtod_high, (void __user *)attr->addr,
1107                                            sizeof(gtod_high)))
1108                 return -EFAULT;
1109
1110         if (gtod_high != 0)
1111                 return -EINVAL;
1112         VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high);
1113
1114         return 0;
1115 }
1116
1117 static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
1118 {
1119         struct kvm_s390_vm_tod_clock gtod = { 0 };
1120
1121         if (copy_from_user(&gtod.tod, (void __user *)attr->addr,
1122                            sizeof(gtod.tod)))
1123                 return -EFAULT;
1124
1125         kvm_s390_set_tod_clock(kvm, &gtod);
1126         VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod.tod);
1127         return 0;
1128 }
1129
1130 static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr)
1131 {
1132         int ret;
1133
1134         if (attr->flags)
1135                 return -EINVAL;
1136
1137         switch (attr->attr) {
1138         case KVM_S390_VM_TOD_EXT:
1139                 ret = kvm_s390_set_tod_ext(kvm, attr);
1140                 break;
1141         case KVM_S390_VM_TOD_HIGH:
1142                 ret = kvm_s390_set_tod_high(kvm, attr);
1143                 break;
1144         case KVM_S390_VM_TOD_LOW:
1145                 ret = kvm_s390_set_tod_low(kvm, attr);
1146                 break;
1147         default:
1148                 ret = -ENXIO;
1149                 break;
1150         }
1151         return ret;
1152 }
1153
1154 static void kvm_s390_get_tod_clock(struct kvm *kvm,
1155                                    struct kvm_s390_vm_tod_clock *gtod)
1156 {
1157         struct kvm_s390_tod_clock_ext htod;
1158
1159         preempt_disable();
1160
1161         get_tod_clock_ext((char *)&htod);
1162
1163         gtod->tod = htod.tod + kvm->arch.epoch;
1164         gtod->epoch_idx = 0;
1165         if (test_kvm_facility(kvm, 139)) {
1166                 gtod->epoch_idx = htod.epoch_idx + kvm->arch.epdx;
1167                 if (gtod->tod < htod.tod)
1168                         gtod->epoch_idx += 1;
1169         }
1170
1171         preempt_enable();
1172 }
1173
1174 static int kvm_s390_get_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
1175 {
1176         struct kvm_s390_vm_tod_clock gtod;
1177
1178         memset(&gtod, 0, sizeof(gtod));
1179         kvm_s390_get_tod_clock(kvm, &gtod);
1180         if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
1181                 return -EFAULT;
1182
1183         VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x, TOD base: 0x%llx",
1184                 gtod.epoch_idx, gtod.tod);
1185         return 0;
1186 }
1187
1188 static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
1189 {
1190         u8 gtod_high = 0;
1191
1192         if (copy_to_user((void __user *)attr->addr, &gtod_high,
1193                                          sizeof(gtod_high)))
1194                 return -EFAULT;
1195         VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high);
1196
1197         return 0;
1198 }
1199
1200 static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
1201 {
1202         u64 gtod;
1203
1204         gtod = kvm_s390_get_tod_clock_fast(kvm);
1205         if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
1206                 return -EFAULT;
1207         VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod);
1208
1209         return 0;
1210 }
1211
1212 static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr)
1213 {
1214         int ret;
1215
1216         if (attr->flags)
1217                 return -EINVAL;
1218
1219         switch (attr->attr) {
1220         case KVM_S390_VM_TOD_EXT:
1221                 ret = kvm_s390_get_tod_ext(kvm, attr);
1222                 break;
1223         case KVM_S390_VM_TOD_HIGH:
1224                 ret = kvm_s390_get_tod_high(kvm, attr);
1225                 break;
1226         case KVM_S390_VM_TOD_LOW:
1227                 ret = kvm_s390_get_tod_low(kvm, attr);
1228                 break;
1229         default:
1230                 ret = -ENXIO;
1231                 break;
1232         }
1233         return ret;
1234 }
1235
1236 static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr)
1237 {
1238         struct kvm_s390_vm_cpu_processor *proc;
1239         u16 lowest_ibc, unblocked_ibc;
1240         int ret = 0;
1241
1242         mutex_lock(&kvm->lock);
1243         if (kvm->created_vcpus) {
1244                 ret = -EBUSY;
1245                 goto out;
1246         }
1247         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
1248         if (!proc) {
1249                 ret = -ENOMEM;
1250                 goto out;
1251         }
1252         if (!copy_from_user(proc, (void __user *)attr->addr,
1253                             sizeof(*proc))) {
1254                 kvm->arch.model.cpuid = proc->cpuid;
1255                 lowest_ibc = sclp.ibc >> 16 & 0xfff;
1256                 unblocked_ibc = sclp.ibc & 0xfff;
1257                 if (lowest_ibc && proc->ibc) {
1258                         if (proc->ibc > unblocked_ibc)
1259                                 kvm->arch.model.ibc = unblocked_ibc;
1260                         else if (proc->ibc < lowest_ibc)
1261                                 kvm->arch.model.ibc = lowest_ibc;
1262                         else
1263                                 kvm->arch.model.ibc = proc->ibc;
1264                 }
1265                 memcpy(kvm->arch.model.fac_list, proc->fac_list,
1266                        S390_ARCH_FAC_LIST_SIZE_BYTE);
1267                 VM_EVENT(kvm, 3, "SET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
1268                          kvm->arch.model.ibc,
1269                          kvm->arch.model.cpuid);
1270                 VM_EVENT(kvm, 3, "SET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
1271                          kvm->arch.model.fac_list[0],
1272                          kvm->arch.model.fac_list[1],
1273                          kvm->arch.model.fac_list[2]);
1274         } else
1275                 ret = -EFAULT;
1276         kfree(proc);
1277 out:
1278         mutex_unlock(&kvm->lock);
1279         return ret;
1280 }
1281
1282 static int kvm_s390_set_processor_feat(struct kvm *kvm,
1283                                        struct kvm_device_attr *attr)
1284 {
1285         struct kvm_s390_vm_cpu_feat data;
1286
1287         if (copy_from_user(&data, (void __user *)attr->addr, sizeof(data)))
1288                 return -EFAULT;
1289         if (!bitmap_subset((unsigned long *) data.feat,
1290                            kvm_s390_available_cpu_feat,
1291                            KVM_S390_VM_CPU_FEAT_NR_BITS))
1292                 return -EINVAL;
1293
1294         mutex_lock(&kvm->lock);
1295         if (kvm->created_vcpus) {
1296                 mutex_unlock(&kvm->lock);
1297                 return -EBUSY;
1298         }
1299         bitmap_copy(kvm->arch.cpu_feat, (unsigned long *) data.feat,
1300                     KVM_S390_VM_CPU_FEAT_NR_BITS);
1301         mutex_unlock(&kvm->lock);
1302         VM_EVENT(kvm, 3, "SET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx",
1303                          data.feat[0],
1304                          data.feat[1],
1305                          data.feat[2]);
1306         return 0;
1307 }
1308
1309 static int kvm_s390_set_processor_subfunc(struct kvm *kvm,
1310                                           struct kvm_device_attr *attr)
1311 {
1312         mutex_lock(&kvm->lock);
1313         if (kvm->created_vcpus) {
1314                 mutex_unlock(&kvm->lock);
1315                 return -EBUSY;
1316         }
1317
1318         if (copy_from_user(&kvm->arch.model.subfuncs, (void __user *)attr->addr,
1319                            sizeof(struct kvm_s390_vm_cpu_subfunc))) {
1320                 mutex_unlock(&kvm->lock);
1321                 return -EFAULT;
1322         }
1323         mutex_unlock(&kvm->lock);
1324
1325         VM_EVENT(kvm, 3, "SET: guest PLO    subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1326                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0],
1327                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1],
1328                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2],
1329                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]);
1330         VM_EVENT(kvm, 3, "SET: guest PTFF   subfunc 0x%16.16lx.%16.16lx",
1331                  ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0],
1332                  ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]);
1333         VM_EVENT(kvm, 3, "SET: guest KMAC   subfunc 0x%16.16lx.%16.16lx",
1334                  ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0],
1335                  ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]);
1336         VM_EVENT(kvm, 3, "SET: guest KMC    subfunc 0x%16.16lx.%16.16lx",
1337                  ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0],
1338                  ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]);
1339         VM_EVENT(kvm, 3, "SET: guest KM     subfunc 0x%16.16lx.%16.16lx",
1340                  ((unsigned long *) &kvm->arch.model.subfuncs.km)[0],
1341                  ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]);
1342         VM_EVENT(kvm, 3, "SET: guest KIMD   subfunc 0x%16.16lx.%16.16lx",
1343                  ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0],
1344                  ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]);
1345         VM_EVENT(kvm, 3, "SET: guest KLMD   subfunc 0x%16.16lx.%16.16lx",
1346                  ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0],
1347                  ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]);
1348         VM_EVENT(kvm, 3, "SET: guest PCKMO  subfunc 0x%16.16lx.%16.16lx",
1349                  ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0],
1350                  ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]);
1351         VM_EVENT(kvm, 3, "SET: guest KMCTR  subfunc 0x%16.16lx.%16.16lx",
1352                  ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0],
1353                  ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]);
1354         VM_EVENT(kvm, 3, "SET: guest KMF    subfunc 0x%16.16lx.%16.16lx",
1355                  ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0],
1356                  ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]);
1357         VM_EVENT(kvm, 3, "SET: guest KMO    subfunc 0x%16.16lx.%16.16lx",
1358                  ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0],
1359                  ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]);
1360         VM_EVENT(kvm, 3, "SET: guest PCC    subfunc 0x%16.16lx.%16.16lx",
1361                  ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0],
1362                  ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]);
1363         VM_EVENT(kvm, 3, "SET: guest PPNO   subfunc 0x%16.16lx.%16.16lx",
1364                  ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0],
1365                  ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]);
1366         VM_EVENT(kvm, 3, "SET: guest KMA    subfunc 0x%16.16lx.%16.16lx",
1367                  ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0],
1368                  ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]);
1369         VM_EVENT(kvm, 3, "SET: guest KDSA   subfunc 0x%16.16lx.%16.16lx",
1370                  ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0],
1371                  ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]);
1372         VM_EVENT(kvm, 3, "SET: guest SORTL  subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1373                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0],
1374                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1],
1375                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2],
1376                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]);
1377         VM_EVENT(kvm, 3, "SET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1378                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0],
1379                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1],
1380                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2],
1381                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]);
1382
1383         return 0;
1384 }
1385
1386 static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
1387 {
1388         int ret = -ENXIO;
1389
1390         switch (attr->attr) {
1391         case KVM_S390_VM_CPU_PROCESSOR:
1392                 ret = kvm_s390_set_processor(kvm, attr);
1393                 break;
1394         case KVM_S390_VM_CPU_PROCESSOR_FEAT:
1395                 ret = kvm_s390_set_processor_feat(kvm, attr);
1396                 break;
1397         case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1398                 ret = kvm_s390_set_processor_subfunc(kvm, attr);
1399                 break;
1400         }
1401         return ret;
1402 }
1403
1404 static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr)
1405 {
1406         struct kvm_s390_vm_cpu_processor *proc;
1407         int ret = 0;
1408
1409         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
1410         if (!proc) {
1411                 ret = -ENOMEM;
1412                 goto out;
1413         }
1414         proc->cpuid = kvm->arch.model.cpuid;
1415         proc->ibc = kvm->arch.model.ibc;
1416         memcpy(&proc->fac_list, kvm->arch.model.fac_list,
1417                S390_ARCH_FAC_LIST_SIZE_BYTE);
1418         VM_EVENT(kvm, 3, "GET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
1419                  kvm->arch.model.ibc,
1420                  kvm->arch.model.cpuid);
1421         VM_EVENT(kvm, 3, "GET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
1422                  kvm->arch.model.fac_list[0],
1423                  kvm->arch.model.fac_list[1],
1424                  kvm->arch.model.fac_list[2]);
1425         if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc)))
1426                 ret = -EFAULT;
1427         kfree(proc);
1428 out:
1429         return ret;
1430 }
1431
1432 static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr)
1433 {
1434         struct kvm_s390_vm_cpu_machine *mach;
1435         int ret = 0;
1436
1437         mach = kzalloc(sizeof(*mach), GFP_KERNEL);
1438         if (!mach) {
1439                 ret = -ENOMEM;
1440                 goto out;
1441         }
1442         get_cpu_id((struct cpuid *) &mach->cpuid);
1443         mach->ibc = sclp.ibc;
1444         memcpy(&mach->fac_mask, kvm->arch.model.fac_mask,
1445                S390_ARCH_FAC_LIST_SIZE_BYTE);
1446         memcpy((unsigned long *)&mach->fac_list, S390_lowcore.stfle_fac_list,
1447                sizeof(S390_lowcore.stfle_fac_list));
1448         VM_EVENT(kvm, 3, "GET: host ibc:  0x%4.4x, host cpuid:  0x%16.16llx",
1449                  kvm->arch.model.ibc,
1450                  kvm->arch.model.cpuid);
1451         VM_EVENT(kvm, 3, "GET: host facmask:  0x%16.16llx.%16.16llx.%16.16llx",
1452                  mach->fac_mask[0],
1453                  mach->fac_mask[1],
1454                  mach->fac_mask[2]);
1455         VM_EVENT(kvm, 3, "GET: host faclist:  0x%16.16llx.%16.16llx.%16.16llx",
1456                  mach->fac_list[0],
1457                  mach->fac_list[1],
1458                  mach->fac_list[2]);
1459         if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach)))
1460                 ret = -EFAULT;
1461         kfree(mach);
1462 out:
1463         return ret;
1464 }
1465
1466 static int kvm_s390_get_processor_feat(struct kvm *kvm,
1467                                        struct kvm_device_attr *attr)
1468 {
1469         struct kvm_s390_vm_cpu_feat data;
1470
1471         bitmap_copy((unsigned long *) data.feat, kvm->arch.cpu_feat,
1472                     KVM_S390_VM_CPU_FEAT_NR_BITS);
1473         if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
1474                 return -EFAULT;
1475         VM_EVENT(kvm, 3, "GET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx",
1476                          data.feat[0],
1477                          data.feat[1],
1478                          data.feat[2]);
1479         return 0;
1480 }
1481
1482 static int kvm_s390_get_machine_feat(struct kvm *kvm,
1483                                      struct kvm_device_attr *attr)
1484 {
1485         struct kvm_s390_vm_cpu_feat data;
1486
1487         bitmap_copy((unsigned long *) data.feat,
1488                     kvm_s390_available_cpu_feat,
1489                     KVM_S390_VM_CPU_FEAT_NR_BITS);
1490         if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
1491                 return -EFAULT;
1492         VM_EVENT(kvm, 3, "GET: host feat:  0x%16.16llx.0x%16.16llx.0x%16.16llx",
1493                          data.feat[0],
1494                          data.feat[1],
1495                          data.feat[2]);
1496         return 0;
1497 }
1498
1499 static int kvm_s390_get_processor_subfunc(struct kvm *kvm,
1500                                           struct kvm_device_attr *attr)
1501 {
1502         if (copy_to_user((void __user *)attr->addr, &kvm->arch.model.subfuncs,
1503             sizeof(struct kvm_s390_vm_cpu_subfunc)))
1504                 return -EFAULT;
1505
1506         VM_EVENT(kvm, 3, "GET: guest PLO    subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1507                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0],
1508                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1],
1509                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2],
1510                  ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]);
1511         VM_EVENT(kvm, 3, "GET: guest PTFF   subfunc 0x%16.16lx.%16.16lx",
1512                  ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0],
1513                  ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]);
1514         VM_EVENT(kvm, 3, "GET: guest KMAC   subfunc 0x%16.16lx.%16.16lx",
1515                  ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0],
1516                  ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]);
1517         VM_EVENT(kvm, 3, "GET: guest KMC    subfunc 0x%16.16lx.%16.16lx",
1518                  ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0],
1519                  ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]);
1520         VM_EVENT(kvm, 3, "GET: guest KM     subfunc 0x%16.16lx.%16.16lx",
1521                  ((unsigned long *) &kvm->arch.model.subfuncs.km)[0],
1522                  ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]);
1523         VM_EVENT(kvm, 3, "GET: guest KIMD   subfunc 0x%16.16lx.%16.16lx",
1524                  ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0],
1525                  ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]);
1526         VM_EVENT(kvm, 3, "GET: guest KLMD   subfunc 0x%16.16lx.%16.16lx",
1527                  ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0],
1528                  ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]);
1529         VM_EVENT(kvm, 3, "GET: guest PCKMO  subfunc 0x%16.16lx.%16.16lx",
1530                  ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0],
1531                  ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]);
1532         VM_EVENT(kvm, 3, "GET: guest KMCTR  subfunc 0x%16.16lx.%16.16lx",
1533                  ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0],
1534                  ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]);
1535         VM_EVENT(kvm, 3, "GET: guest KMF    subfunc 0x%16.16lx.%16.16lx",
1536                  ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0],
1537                  ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]);
1538         VM_EVENT(kvm, 3, "GET: guest KMO    subfunc 0x%16.16lx.%16.16lx",
1539                  ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0],
1540                  ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]);
1541         VM_EVENT(kvm, 3, "GET: guest PCC    subfunc 0x%16.16lx.%16.16lx",
1542                  ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0],
1543                  ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]);
1544         VM_EVENT(kvm, 3, "GET: guest PPNO   subfunc 0x%16.16lx.%16.16lx",
1545                  ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0],
1546                  ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]);
1547         VM_EVENT(kvm, 3, "GET: guest KMA    subfunc 0x%16.16lx.%16.16lx",
1548                  ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0],
1549                  ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]);
1550         VM_EVENT(kvm, 3, "GET: guest KDSA   subfunc 0x%16.16lx.%16.16lx",
1551                  ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0],
1552                  ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]);
1553         VM_EVENT(kvm, 3, "GET: guest SORTL  subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1554                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0],
1555                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1],
1556                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2],
1557                  ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]);
1558         VM_EVENT(kvm, 3, "GET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1559                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0],
1560                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1],
1561                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2],
1562                  ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]);
1563
1564         return 0;
1565 }
1566
1567 static int kvm_s390_get_machine_subfunc(struct kvm *kvm,
1568                                         struct kvm_device_attr *attr)
1569 {
1570         if (copy_to_user((void __user *)attr->addr, &kvm_s390_available_subfunc,
1571             sizeof(struct kvm_s390_vm_cpu_subfunc)))
1572                 return -EFAULT;
1573
1574         VM_EVENT(kvm, 3, "GET: host  PLO    subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1575                  ((unsigned long *) &kvm_s390_available_subfunc.plo)[0],
1576                  ((unsigned long *) &kvm_s390_available_subfunc.plo)[1],
1577                  ((unsigned long *) &kvm_s390_available_subfunc.plo)[2],
1578                  ((unsigned long *) &kvm_s390_available_subfunc.plo)[3]);
1579         VM_EVENT(kvm, 3, "GET: host  PTFF   subfunc 0x%16.16lx.%16.16lx",
1580                  ((unsigned long *) &kvm_s390_available_subfunc.ptff)[0],
1581                  ((unsigned long *) &kvm_s390_available_subfunc.ptff)[1]);
1582         VM_EVENT(kvm, 3, "GET: host  KMAC   subfunc 0x%16.16lx.%16.16lx",
1583                  ((unsigned long *) &kvm_s390_available_subfunc.kmac)[0],
1584                  ((unsigned long *) &kvm_s390_available_subfunc.kmac)[1]);
1585         VM_EVENT(kvm, 3, "GET: host  KMC    subfunc 0x%16.16lx.%16.16lx",
1586                  ((unsigned long *) &kvm_s390_available_subfunc.kmc)[0],
1587                  ((unsigned long *) &kvm_s390_available_subfunc.kmc)[1]);
1588         VM_EVENT(kvm, 3, "GET: host  KM     subfunc 0x%16.16lx.%16.16lx",
1589                  ((unsigned long *) &kvm_s390_available_subfunc.km)[0],
1590                  ((unsigned long *) &kvm_s390_available_subfunc.km)[1]);
1591         VM_EVENT(kvm, 3, "GET: host  KIMD   subfunc 0x%16.16lx.%16.16lx",
1592                  ((unsigned long *) &kvm_s390_available_subfunc.kimd)[0],
1593                  ((unsigned long *) &kvm_s390_available_subfunc.kimd)[1]);
1594         VM_EVENT(kvm, 3, "GET: host  KLMD   subfunc 0x%16.16lx.%16.16lx",
1595                  ((unsigned long *) &kvm_s390_available_subfunc.klmd)[0],
1596                  ((unsigned long *) &kvm_s390_available_subfunc.klmd)[1]);
1597         VM_EVENT(kvm, 3, "GET: host  PCKMO  subfunc 0x%16.16lx.%16.16lx",
1598                  ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[0],
1599                  ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[1]);
1600         VM_EVENT(kvm, 3, "GET: host  KMCTR  subfunc 0x%16.16lx.%16.16lx",
1601                  ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[0],
1602                  ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[1]);
1603         VM_EVENT(kvm, 3, "GET: host  KMF    subfunc 0x%16.16lx.%16.16lx",
1604                  ((unsigned long *) &kvm_s390_available_subfunc.kmf)[0],
1605                  ((unsigned long *) &kvm_s390_available_subfunc.kmf)[1]);
1606         VM_EVENT(kvm, 3, "GET: host  KMO    subfunc 0x%16.16lx.%16.16lx",
1607                  ((unsigned long *) &kvm_s390_available_subfunc.kmo)[0],
1608                  ((unsigned long *) &kvm_s390_available_subfunc.kmo)[1]);
1609         VM_EVENT(kvm, 3, "GET: host  PCC    subfunc 0x%16.16lx.%16.16lx",
1610                  ((unsigned long *) &kvm_s390_available_subfunc.pcc)[0],
1611                  ((unsigned long *) &kvm_s390_available_subfunc.pcc)[1]);
1612         VM_EVENT(kvm, 3, "GET: host  PPNO   subfunc 0x%16.16lx.%16.16lx",
1613                  ((unsigned long *) &kvm_s390_available_subfunc.ppno)[0],
1614                  ((unsigned long *) &kvm_s390_available_subfunc.ppno)[1]);
1615         VM_EVENT(kvm, 3, "GET: host  KMA    subfunc 0x%16.16lx.%16.16lx",
1616                  ((unsigned long *) &kvm_s390_available_subfunc.kma)[0],
1617                  ((unsigned long *) &kvm_s390_available_subfunc.kma)[1]);
1618         VM_EVENT(kvm, 3, "GET: host  KDSA   subfunc 0x%16.16lx.%16.16lx",
1619                  ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[0],
1620                  ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[1]);
1621         VM_EVENT(kvm, 3, "GET: host  SORTL  subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1622                  ((unsigned long *) &kvm_s390_available_subfunc.sortl)[0],
1623                  ((unsigned long *) &kvm_s390_available_subfunc.sortl)[1],
1624                  ((unsigned long *) &kvm_s390_available_subfunc.sortl)[2],
1625                  ((unsigned long *) &kvm_s390_available_subfunc.sortl)[3]);
1626         VM_EVENT(kvm, 3, "GET: host  DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1627                  ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[0],
1628                  ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[1],
1629                  ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[2],
1630                  ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[3]);
1631
1632         return 0;
1633 }
1634
1635 static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
1636 {
1637         int ret = -ENXIO;
1638
1639         switch (attr->attr) {
1640         case KVM_S390_VM_CPU_PROCESSOR:
1641                 ret = kvm_s390_get_processor(kvm, attr);
1642                 break;
1643         case KVM_S390_VM_CPU_MACHINE:
1644                 ret = kvm_s390_get_machine(kvm, attr);
1645                 break;
1646         case KVM_S390_VM_CPU_PROCESSOR_FEAT:
1647                 ret = kvm_s390_get_processor_feat(kvm, attr);
1648                 break;
1649         case KVM_S390_VM_CPU_MACHINE_FEAT:
1650                 ret = kvm_s390_get_machine_feat(kvm, attr);
1651                 break;
1652         case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1653                 ret = kvm_s390_get_processor_subfunc(kvm, attr);
1654                 break;
1655         case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
1656                 ret = kvm_s390_get_machine_subfunc(kvm, attr);
1657                 break;
1658         }
1659         return ret;
1660 }
1661
1662 static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1663 {
1664         int ret;
1665
1666         switch (attr->group) {
1667         case KVM_S390_VM_MEM_CTRL:
1668                 ret = kvm_s390_set_mem_control(kvm, attr);
1669                 break;
1670         case KVM_S390_VM_TOD:
1671                 ret = kvm_s390_set_tod(kvm, attr);
1672                 break;
1673         case KVM_S390_VM_CPU_MODEL:
1674                 ret = kvm_s390_set_cpu_model(kvm, attr);
1675                 break;
1676         case KVM_S390_VM_CRYPTO:
1677                 ret = kvm_s390_vm_set_crypto(kvm, attr);
1678                 break;
1679         case KVM_S390_VM_MIGRATION:
1680                 ret = kvm_s390_vm_set_migration(kvm, attr);
1681                 break;
1682         default:
1683                 ret = -ENXIO;
1684                 break;
1685         }
1686
1687         return ret;
1688 }
1689
1690 static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1691 {
1692         int ret;
1693
1694         switch (attr->group) {
1695         case KVM_S390_VM_MEM_CTRL:
1696                 ret = kvm_s390_get_mem_control(kvm, attr);
1697                 break;
1698         case KVM_S390_VM_TOD:
1699                 ret = kvm_s390_get_tod(kvm, attr);
1700                 break;
1701         case KVM_S390_VM_CPU_MODEL:
1702                 ret = kvm_s390_get_cpu_model(kvm, attr);
1703                 break;
1704         case KVM_S390_VM_MIGRATION:
1705                 ret = kvm_s390_vm_get_migration(kvm, attr);
1706                 break;
1707         default:
1708                 ret = -ENXIO;
1709                 break;
1710         }
1711
1712         return ret;
1713 }
1714
1715 static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1716 {
1717         int ret;
1718
1719         switch (attr->group) {
1720         case KVM_S390_VM_MEM_CTRL:
1721                 switch (attr->attr) {
1722                 case KVM_S390_VM_MEM_ENABLE_CMMA:
1723                 case KVM_S390_VM_MEM_CLR_CMMA:
1724                         ret = sclp.has_cmma ? 0 : -ENXIO;
1725                         break;
1726                 case KVM_S390_VM_MEM_LIMIT_SIZE:
1727                         ret = 0;
1728                         break;
1729                 default:
1730                         ret = -ENXIO;
1731                         break;
1732                 }
1733                 break;
1734         case KVM_S390_VM_TOD:
1735                 switch (attr->attr) {
1736                 case KVM_S390_VM_TOD_LOW:
1737                 case KVM_S390_VM_TOD_HIGH:
1738                         ret = 0;
1739                         break;
1740                 default:
1741                         ret = -ENXIO;
1742                         break;
1743                 }
1744                 break;
1745         case KVM_S390_VM_CPU_MODEL:
1746                 switch (attr->attr) {
1747                 case KVM_S390_VM_CPU_PROCESSOR:
1748                 case KVM_S390_VM_CPU_MACHINE:
1749                 case KVM_S390_VM_CPU_PROCESSOR_FEAT:
1750                 case KVM_S390_VM_CPU_MACHINE_FEAT:
1751                 case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
1752                 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1753                         ret = 0;
1754                         break;
1755                 default:
1756                         ret = -ENXIO;
1757                         break;
1758                 }
1759                 break;
1760         case KVM_S390_VM_CRYPTO:
1761                 switch (attr->attr) {
1762                 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
1763                 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
1764                 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
1765                 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
1766                         ret = 0;
1767                         break;
1768                 case KVM_S390_VM_CRYPTO_ENABLE_APIE:
1769                 case KVM_S390_VM_CRYPTO_DISABLE_APIE:
1770                         ret = ap_instructions_available() ? 0 : -ENXIO;
1771                         break;
1772                 default:
1773                         ret = -ENXIO;
1774                         break;
1775                 }
1776                 break;
1777         case KVM_S390_VM_MIGRATION:
1778                 ret = 0;
1779                 break;
1780         default:
1781                 ret = -ENXIO;
1782                 break;
1783         }
1784
1785         return ret;
1786 }
1787
1788 static long kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
1789 {
1790         uint8_t *keys;
1791         uint64_t hva;
1792         int srcu_idx, i, r = 0;
1793
1794         if (args->flags != 0)
1795                 return -EINVAL;
1796
1797         /* Is this guest using storage keys? */
1798         if (!mm_uses_skeys(current->mm))
1799                 return KVM_S390_GET_SKEYS_NONE;
1800
1801         /* Enforce sane limit on memory allocation */
1802         if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
1803                 return -EINVAL;
1804
1805         keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL);
1806         if (!keys)
1807                 return -ENOMEM;
1808
1809         down_read(&current->mm->mmap_sem);
1810         srcu_idx = srcu_read_lock(&kvm->srcu);
1811         for (i = 0; i < args->count; i++) {
1812                 hva = gfn_to_hva(kvm, args->start_gfn + i);
1813                 if (kvm_is_error_hva(hva)) {
1814                         r = -EFAULT;
1815                         break;
1816                 }
1817
1818                 r = get_guest_storage_key(current->mm, hva, &keys[i]);
1819                 if (r)
1820                         break;
1821         }
1822         srcu_read_unlock(&kvm->srcu, srcu_idx);
1823         up_read(&current->mm->mmap_sem);
1824
1825         if (!r) {
1826                 r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys,
1827                                  sizeof(uint8_t) * args->count);
1828                 if (r)
1829                         r = -EFAULT;
1830         }
1831
1832         kvfree(keys);
1833         return r;
1834 }
1835
1836 static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
1837 {
1838         uint8_t *keys;
1839         uint64_t hva;
1840         int srcu_idx, i, r = 0;
1841         bool unlocked;
1842
1843         if (args->flags != 0)
1844                 return -EINVAL;
1845
1846         /* Enforce sane limit on memory allocation */
1847         if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
1848                 return -EINVAL;
1849
1850         keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL);
1851         if (!keys)
1852                 return -ENOMEM;
1853
1854         r = copy_from_user(keys, (uint8_t __user *)args->skeydata_addr,
1855                            sizeof(uint8_t) * args->count);
1856         if (r) {
1857                 r = -EFAULT;
1858                 goto out;
1859         }
1860
1861         /* Enable storage key handling for the guest */
1862         r = s390_enable_skey();
1863         if (r)
1864                 goto out;
1865
1866         i = 0;
1867         down_read(&current->mm->mmap_sem);
1868         srcu_idx = srcu_read_lock(&kvm->srcu);
1869         while (i < args->count) {
1870                 unlocked = false;
1871                 hva = gfn_to_hva(kvm, args->start_gfn + i);
1872                 if (kvm_is_error_hva(hva)) {
1873                         r = -EFAULT;
1874                         break;
1875                 }
1876
1877                 /* Lowest order bit is reserved */
1878                 if (keys[i] & 0x01) {
1879                         r = -EINVAL;
1880                         break;
1881                 }
1882
1883                 r = set_guest_storage_key(current->mm, hva, keys[i], 0);
1884                 if (r) {
1885                         r = fixup_user_fault(current, current->mm, hva,
1886                                              FAULT_FLAG_WRITE, &unlocked);
1887                         if (r)
1888                                 break;
1889                 }
1890                 if (!r)
1891                         i++;
1892         }
1893         srcu_read_unlock(&kvm->srcu, srcu_idx);
1894         up_read(&current->mm->mmap_sem);
1895 out:
1896         kvfree(keys);
1897         return r;
1898 }
1899
1900 /*
1901  * Base address and length must be sent at the start of each block, therefore
1902  * it's cheaper to send some clean data, as long as it's less than the size of
1903  * two longs.
1904  */
1905 #define KVM_S390_MAX_BIT_DISTANCE (2 * sizeof(void *))
1906 /* for consistency */
1907 #define KVM_S390_CMMA_SIZE_MAX ((u32)KVM_S390_SKEYS_MAX)
1908
1909 /*
1910  * Similar to gfn_to_memslot, but returns the index of a memslot also when the
1911  * address falls in a hole. In that case the index of one of the memslots
1912  * bordering the hole is returned.
1913  */
1914 static int gfn_to_memslot_approx(struct kvm_memslots *slots, gfn_t gfn)
1915 {
1916         int start = 0, end = slots->used_slots;
1917         int slot = atomic_read(&slots->lru_slot);
1918         struct kvm_memory_slot *memslots = slots->memslots;
1919
1920         if (gfn >= memslots[slot].base_gfn &&
1921             gfn < memslots[slot].base_gfn + memslots[slot].npages)
1922                 return slot;
1923
1924         while (start < end) {
1925                 slot = start + (end - start) / 2;
1926
1927                 if (gfn >= memslots[slot].base_gfn)
1928                         end = slot;
1929                 else
1930                         start = slot + 1;
1931         }
1932
1933         if (gfn >= memslots[start].base_gfn &&
1934             gfn < memslots[start].base_gfn + memslots[start].npages) {
1935                 atomic_set(&slots->lru_slot, start);
1936         }
1937
1938         return start;
1939 }
1940
1941 static int kvm_s390_peek_cmma(struct kvm *kvm, struct kvm_s390_cmma_log *args,
1942                               u8 *res, unsigned long bufsize)
1943 {
1944         unsigned long pgstev, hva, cur_gfn = args->start_gfn;
1945
1946         args->count = 0;
1947         while (args->count < bufsize) {
1948                 hva = gfn_to_hva(kvm, cur_gfn);
1949                 /*
1950                  * We return an error if the first value was invalid, but we
1951                  * return successfully if at least one value was copied.
1952                  */
1953                 if (kvm_is_error_hva(hva))
1954                         return args->count ? 0 : -EFAULT;
1955                 if (get_pgste(kvm->mm, hva, &pgstev) < 0)
1956                         pgstev = 0;
1957                 res[args->count++] = (pgstev >> 24) & 0x43;
1958                 cur_gfn++;
1959         }
1960
1961         return 0;
1962 }
1963
1964 static unsigned long kvm_s390_next_dirty_cmma(struct kvm_memslots *slots,
1965                                               unsigned long cur_gfn)
1966 {
1967         int slotidx = gfn_to_memslot_approx(slots, cur_gfn);
1968         struct kvm_memory_slot *ms = slots->memslots + slotidx;
1969         unsigned long ofs = cur_gfn - ms->base_gfn;
1970
1971         if (ms->base_gfn + ms->npages <= cur_gfn) {
1972                 slotidx--;
1973                 /* If we are above the highest slot, wrap around */
1974                 if (slotidx < 0)
1975                         slotidx = slots->used_slots - 1;
1976
1977                 ms = slots->memslots + slotidx;
1978                 ofs = 0;
1979         }
1980         ofs = find_next_bit(kvm_second_dirty_bitmap(ms), ms->npages, ofs);
1981         while ((slotidx > 0) && (ofs >= ms->npages)) {
1982                 slotidx--;
1983                 ms = slots->memslots + slotidx;
1984                 ofs = find_next_bit(kvm_second_dirty_bitmap(ms), ms->npages, 0);
1985         }
1986         return ms->base_gfn + ofs;
1987 }
1988
1989 static int kvm_s390_get_cmma(struct kvm *kvm, struct kvm_s390_cmma_log *args,
1990                              u8 *res, unsigned long bufsize)
1991 {
1992         unsigned long mem_end, cur_gfn, next_gfn, hva, pgstev;
1993         struct kvm_memslots *slots = kvm_memslots(kvm);
1994         struct kvm_memory_slot *ms;
1995
1996         cur_gfn = kvm_s390_next_dirty_cmma(slots, args->start_gfn);
1997         ms = gfn_to_memslot(kvm, cur_gfn);
1998         args->count = 0;
1999         args->start_gfn = cur_gfn;
2000         if (!ms)
2001                 return 0;
2002         next_gfn = kvm_s390_next_dirty_cmma(slots, cur_gfn + 1);
2003         mem_end = slots->memslots[0].base_gfn + slots->memslots[0].npages;
2004
2005         while (args->count < bufsize) {
2006                 hva = gfn_to_hva(kvm, cur_gfn);
2007                 if (kvm_is_error_hva(hva))
2008                         return 0;
2009                 /* Decrement only if we actually flipped the bit to 0 */
2010                 if (test_and_clear_bit(cur_gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
2011                         atomic64_dec(&kvm->arch.cmma_dirty_pages);
2012                 if (get_pgste(kvm->mm, hva, &pgstev) < 0)
2013                         pgstev = 0;
2014                 /* Save the value */
2015                 res[args->count++] = (pgstev >> 24) & 0x43;
2016                 /* If the next bit is too far away, stop. */
2017                 if (next_gfn > cur_gfn + KVM_S390_MAX_BIT_DISTANCE)
2018                         return 0;
2019                 /* If we reached the previous "next", find the next one */
2020                 if (cur_gfn == next_gfn)
2021                         next_gfn = kvm_s390_next_dirty_cmma(slots, cur_gfn + 1);
2022                 /* Reached the end of memory or of the buffer, stop */
2023                 if ((next_gfn >= mem_end) ||
2024                     (next_gfn - args->start_gfn >= bufsize))
2025                         return 0;
2026                 cur_gfn++;
2027                 /* Reached the end of the current memslot, take the next one. */
2028                 if (cur_gfn - ms->base_gfn >= ms->npages) {
2029                         ms = gfn_to_memslot(kvm, cur_gfn);
2030                         if (!ms)
2031                                 return 0;
2032                 }
2033         }
2034         return 0;
2035 }
2036
2037 /*
2038  * This function searches for the next page with dirty CMMA attributes, and
2039  * saves the attributes in the buffer up to either the end of the buffer or
2040  * until a block of at least KVM_S390_MAX_BIT_DISTANCE clean bits is found;
2041  * no trailing clean bytes are saved.
2042  * In case no dirty bits were found, or if CMMA was not enabled or used, the
2043  * output buffer will indicate 0 as length.
2044  */
2045 static int kvm_s390_get_cmma_bits(struct kvm *kvm,
2046                                   struct kvm_s390_cmma_log *args)
2047 {
2048         unsigned long bufsize;
2049         int srcu_idx, peek, ret;
2050         u8 *values;
2051
2052         if (!kvm->arch.use_cmma)
2053                 return -ENXIO;
2054         /* Invalid/unsupported flags were specified */
2055         if (args->flags & ~KVM_S390_CMMA_PEEK)
2056                 return -EINVAL;
2057         /* Migration mode query, and we are not doing a migration */
2058         peek = !!(args->flags & KVM_S390_CMMA_PEEK);
2059         if (!peek && !kvm->arch.migration_mode)
2060                 return -EINVAL;
2061         /* CMMA is disabled or was not used, or the buffer has length zero */
2062         bufsize = min(args->count, KVM_S390_CMMA_SIZE_MAX);
2063         if (!bufsize || !kvm->mm->context.uses_cmm) {
2064                 memset(args, 0, sizeof(*args));
2065                 return 0;
2066         }
2067         /* We are not peeking, and there are no dirty pages */
2068         if (!peek && !atomic64_read(&kvm->arch.cmma_dirty_pages)) {
2069                 memset(args, 0, sizeof(*args));
2070                 return 0;
2071         }
2072
2073         values = vmalloc(bufsize);
2074         if (!values)
2075                 return -ENOMEM;
2076
2077         down_read(&kvm->mm->mmap_sem);
2078         srcu_idx = srcu_read_lock(&kvm->srcu);
2079         if (peek)
2080                 ret = kvm_s390_peek_cmma(kvm, args, values, bufsize);
2081         else
2082                 ret = kvm_s390_get_cmma(kvm, args, values, bufsize);
2083         srcu_read_unlock(&kvm->srcu, srcu_idx);
2084         up_read(&kvm->mm->mmap_sem);
2085
2086         if (kvm->arch.migration_mode)
2087                 args->remaining = atomic64_read(&kvm->arch.cmma_dirty_pages);
2088         else
2089                 args->remaining = 0;
2090
2091         if (copy_to_user((void __user *)args->values, values, args->count))
2092                 ret = -EFAULT;
2093
2094         vfree(values);
2095         return ret;
2096 }
2097
2098 /*
2099  * This function sets the CMMA attributes for the given pages. If the input
2100  * buffer has zero length, no action is taken, otherwise the attributes are
2101  * set and the mm->context.uses_cmm flag is set.
2102  */
2103 static int kvm_s390_set_cmma_bits(struct kvm *kvm,
2104                                   const struct kvm_s390_cmma_log *args)
2105 {
2106         unsigned long hva, mask, pgstev, i;
2107         uint8_t *bits;
2108         int srcu_idx, r = 0;
2109
2110         mask = args->mask;
2111
2112         if (!kvm->arch.use_cmma)
2113                 return -ENXIO;
2114         /* invalid/unsupported flags */
2115         if (args->flags != 0)
2116                 return -EINVAL;
2117         /* Enforce sane limit on memory allocation */
2118         if (args->count > KVM_S390_CMMA_SIZE_MAX)
2119                 return -EINVAL;
2120         /* Nothing to do */
2121         if (args->count == 0)
2122                 return 0;
2123
2124         bits = vmalloc(array_size(sizeof(*bits), args->count));
2125         if (!bits)
2126                 return -ENOMEM;
2127
2128         r = copy_from_user(bits, (void __user *)args->values, args->count);
2129         if (r) {
2130                 r = -EFAULT;
2131                 goto out;
2132         }
2133
2134         down_read(&kvm->mm->mmap_sem);
2135         srcu_idx = srcu_read_lock(&kvm->srcu);
2136         for (i = 0; i < args->count; i++) {
2137                 hva = gfn_to_hva(kvm, args->start_gfn + i);
2138                 if (kvm_is_error_hva(hva)) {
2139                         r = -EFAULT;
2140                         break;
2141                 }
2142
2143                 pgstev = bits[i];
2144                 pgstev = pgstev << 24;
2145                 mask &= _PGSTE_GPS_USAGE_MASK | _PGSTE_GPS_NODAT;
2146                 set_pgste_bits(kvm->mm, hva, mask, pgstev);
2147         }
2148         srcu_read_unlock(&kvm->srcu, srcu_idx);
2149         up_read(&kvm->mm->mmap_sem);
2150
2151         if (!kvm->mm->context.uses_cmm) {
2152                 down_write(&kvm->mm->mmap_sem);
2153                 kvm->mm->context.uses_cmm = 1;
2154                 up_write(&kvm->mm->mmap_sem);
2155         }
2156 out:
2157         vfree(bits);
2158         return r;
2159 }
2160
2161 long kvm_arch_vm_ioctl(struct file *filp,
2162                        unsigned int ioctl, unsigned long arg)
2163 {
2164         struct kvm *kvm = filp->private_data;
2165         void __user *argp = (void __user *)arg;
2166         struct kvm_device_attr attr;
2167         int r;
2168
2169         switch (ioctl) {
2170         case KVM_S390_INTERRUPT: {
2171                 struct kvm_s390_interrupt s390int;
2172
2173                 r = -EFAULT;
2174                 if (copy_from_user(&s390int, argp, sizeof(s390int)))
2175                         break;
2176                 r = kvm_s390_inject_vm(kvm, &s390int);
2177                 break;
2178         }
2179         case KVM_CREATE_IRQCHIP: {
2180                 struct kvm_irq_routing_entry routing;
2181
2182                 r = -EINVAL;
2183                 if (kvm->arch.use_irqchip) {
2184                         /* Set up dummy routing. */
2185                         memset(&routing, 0, sizeof(routing));
2186                         r = kvm_set_irq_routing(kvm, &routing, 0, 0);
2187                 }
2188                 break;
2189         }
2190         case KVM_SET_DEVICE_ATTR: {
2191                 r = -EFAULT;
2192                 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2193                         break;
2194                 r = kvm_s390_vm_set_attr(kvm, &attr);
2195                 break;
2196         }
2197         case KVM_GET_DEVICE_ATTR: {
2198                 r = -EFAULT;
2199                 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2200                         break;
2201                 r = kvm_s390_vm_get_attr(kvm, &attr);
2202                 break;
2203         }
2204         case KVM_HAS_DEVICE_ATTR: {
2205                 r = -EFAULT;
2206                 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2207                         break;
2208                 r = kvm_s390_vm_has_attr(kvm, &attr);
2209                 break;
2210         }
2211         case KVM_S390_GET_SKEYS: {
2212                 struct kvm_s390_skeys args;
2213
2214                 r = -EFAULT;
2215                 if (copy_from_user(&args, argp,
2216                                    sizeof(struct kvm_s390_skeys)))
2217                         break;
2218                 r = kvm_s390_get_skeys(kvm, &args);
2219                 break;
2220         }
2221         case KVM_S390_SET_SKEYS: {
2222                 struct kvm_s390_skeys args;
2223
2224                 r = -EFAULT;
2225                 if (copy_from_user(&args, argp,
2226                                    sizeof(struct kvm_s390_skeys)))
2227                         break;
2228                 r = kvm_s390_set_skeys(kvm, &args);
2229                 break;
2230         }
2231         case KVM_S390_GET_CMMA_BITS: {
2232                 struct kvm_s390_cmma_log args;
2233
2234                 r = -EFAULT;
2235                 if (copy_from_user(&args, argp, sizeof(args)))
2236                         break;
2237                 mutex_lock(&kvm->slots_lock);
2238                 r = kvm_s390_get_cmma_bits(kvm, &args);
2239                 mutex_unlock(&kvm->slots_lock);
2240                 if (!r) {
2241                         r = copy_to_user(argp, &args, sizeof(args));
2242                         if (r)
2243                                 r = -EFAULT;
2244                 }
2245                 break;
2246         }
2247         case KVM_S390_SET_CMMA_BITS: {
2248                 struct kvm_s390_cmma_log args;
2249
2250                 r = -EFAULT;
2251                 if (copy_from_user(&args, argp, sizeof(args)))
2252                         break;
2253                 mutex_lock(&kvm->slots_lock);
2254                 r = kvm_s390_set_cmma_bits(kvm, &args);
2255                 mutex_unlock(&kvm->slots_lock);
2256                 break;
2257         }
2258         default:
2259                 r = -ENOTTY;
2260         }
2261
2262         return r;
2263 }
2264
2265 static int kvm_s390_apxa_installed(void)
2266 {
2267         struct ap_config_info info;
2268
2269         if (ap_instructions_available()) {
2270                 if (ap_qci(&info) == 0)
2271                         return info.apxa;
2272         }
2273
2274         return 0;
2275 }
2276
2277 /*
2278  * The format of the crypto control block (CRYCB) is specified in the 3 low
2279  * order bits of the CRYCB designation (CRYCBD) field as follows:
2280  * Format 0: Neither the message security assist extension 3 (MSAX3) nor the
2281  *           AP extended addressing (APXA) facility are installed.
2282  * Format 1: The APXA facility is not installed but the MSAX3 facility is.
2283  * Format 2: Both the APXA and MSAX3 facilities are installed
2284  */
2285 static void kvm_s390_set_crycb_format(struct kvm *kvm)
2286 {
2287         kvm->arch.crypto.crycbd = (__u32)(unsigned long) kvm->arch.crypto.crycb;
2288
2289         /* Clear the CRYCB format bits - i.e., set format 0 by default */
2290         kvm->arch.crypto.crycbd &= ~(CRYCB_FORMAT_MASK);
2291
2292         /* Check whether MSAX3 is installed */
2293         if (!test_kvm_facility(kvm, 76))
2294                 return;
2295
2296         if (kvm_s390_apxa_installed())
2297                 kvm->arch.crypto.crycbd |= CRYCB_FORMAT2;
2298         else
2299                 kvm->arch.crypto.crycbd |= CRYCB_FORMAT1;
2300 }
2301
2302 void kvm_arch_crypto_set_masks(struct kvm *kvm, unsigned long *apm,
2303                                unsigned long *aqm, unsigned long *adm)
2304 {
2305         struct kvm_s390_crypto_cb *crycb = kvm->arch.crypto.crycb;
2306
2307         mutex_lock(&kvm->lock);
2308         kvm_s390_vcpu_block_all(kvm);
2309
2310         switch (kvm->arch.crypto.crycbd & CRYCB_FORMAT_MASK) {
2311         case CRYCB_FORMAT2: /* APCB1 use 256 bits */
2312                 memcpy(crycb->apcb1.apm, apm, 32);
2313                 VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx %016lx %016lx %016lx",
2314                          apm[0], apm[1], apm[2], apm[3]);
2315                 memcpy(crycb->apcb1.aqm, aqm, 32);
2316                 VM_EVENT(kvm, 3, "SET CRYCB: aqm %016lx %016lx %016lx %016lx",
2317                          aqm[0], aqm[1], aqm[2], aqm[3]);
2318                 memcpy(crycb->apcb1.adm, adm, 32);
2319                 VM_EVENT(kvm, 3, "SET CRYCB: adm %016lx %016lx %016lx %016lx",
2320                          adm[0], adm[1], adm[2], adm[3]);
2321                 break;
2322         case CRYCB_FORMAT1:
2323         case CRYCB_FORMAT0: /* Fall through both use APCB0 */
2324                 memcpy(crycb->apcb0.apm, apm, 8);
2325                 memcpy(crycb->apcb0.aqm, aqm, 2);
2326                 memcpy(crycb->apcb0.adm, adm, 2);
2327                 VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx aqm %04x adm %04x",
2328                          apm[0], *((unsigned short *)aqm),
2329                          *((unsigned short *)adm));
2330                 break;
2331         default:        /* Can not happen */
2332                 break;
2333         }
2334
2335         /* recreate the shadow crycb for each vcpu */
2336         kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART);
2337         kvm_s390_vcpu_unblock_all(kvm);
2338         mutex_unlock(&kvm->lock);
2339 }
2340 EXPORT_SYMBOL_GPL(kvm_arch_crypto_set_masks);
2341
2342 void kvm_arch_crypto_clear_masks(struct kvm *kvm)
2343 {
2344         mutex_lock(&kvm->lock);
2345         kvm_s390_vcpu_block_all(kvm);
2346
2347         memset(&kvm->arch.crypto.crycb->apcb0, 0,
2348                sizeof(kvm->arch.crypto.crycb->apcb0));
2349         memset(&kvm->arch.crypto.crycb->apcb1, 0,
2350                sizeof(kvm->arch.crypto.crycb->apcb1));
2351
2352         VM_EVENT(kvm, 3, "%s", "CLR CRYCB:");
2353         /* recreate the shadow crycb for each vcpu */
2354         kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART);
2355         kvm_s390_vcpu_unblock_all(kvm);
2356         mutex_unlock(&kvm->lock);
2357 }
2358 EXPORT_SYMBOL_GPL(kvm_arch_crypto_clear_masks);
2359
2360 static u64 kvm_s390_get_initial_cpuid(void)
2361 {
2362         struct cpuid cpuid;
2363
2364         get_cpu_id(&cpuid);
2365         cpuid.version = 0xff;
2366         return *((u64 *) &cpuid);
2367 }
2368
2369 static void kvm_s390_crypto_init(struct kvm *kvm)
2370 {
2371         kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb;
2372         kvm_s390_set_crycb_format(kvm);
2373
2374         if (!test_kvm_facility(kvm, 76))
2375                 return;
2376
2377         /* Enable AES/DEA protected key functions by default */
2378         kvm->arch.crypto.aes_kw = 1;
2379         kvm->arch.crypto.dea_kw = 1;
2380         get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask,
2381                          sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
2382         get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask,
2383                          sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
2384 }
2385
2386 static void sca_dispose(struct kvm *kvm)
2387 {
2388         if (kvm->arch.use_esca)
2389                 free_pages_exact(kvm->arch.sca, sizeof(struct esca_block));
2390         else
2391                 free_page((unsigned long)(kvm->arch.sca));
2392         kvm->arch.sca = NULL;
2393 }
2394
2395 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
2396 {
2397         gfp_t alloc_flags = GFP_KERNEL;
2398         int i, rc;
2399         char debug_name[16];
2400         static unsigned long sca_offset;
2401
2402         rc = -EINVAL;
2403 #ifdef CONFIG_KVM_S390_UCONTROL
2404         if (type & ~KVM_VM_S390_UCONTROL)
2405                 goto out_err;
2406         if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN)))
2407                 goto out_err;
2408 #else
2409         if (type)
2410                 goto out_err;
2411 #endif
2412
2413         rc = s390_enable_sie();
2414         if (rc)
2415                 goto out_err;
2416
2417         rc = -ENOMEM;
2418
2419         if (!sclp.has_64bscao)
2420                 alloc_flags |= GFP_DMA;
2421         rwlock_init(&kvm->arch.sca_lock);
2422         /* start with basic SCA */
2423         kvm->arch.sca = (struct bsca_block *) get_zeroed_page(alloc_flags);
2424         if (!kvm->arch.sca)
2425                 goto out_err;
2426         mutex_lock(&kvm_lock);
2427         sca_offset += 16;
2428         if (sca_offset + sizeof(struct bsca_block) > PAGE_SIZE)
2429                 sca_offset = 0;
2430         kvm->arch.sca = (struct bsca_block *)
2431                         ((char *) kvm->arch.sca + sca_offset);
2432         mutex_unlock(&kvm_lock);
2433
2434         sprintf(debug_name, "kvm-%u", current->pid);
2435
2436         kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long));
2437         if (!kvm->arch.dbf)
2438                 goto out_err;
2439
2440         BUILD_BUG_ON(sizeof(struct sie_page2) != 4096);
2441         kvm->arch.sie_page2 =
2442              (struct sie_page2 *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
2443         if (!kvm->arch.sie_page2)
2444                 goto out_err;
2445
2446         kvm->arch.sie_page2->kvm = kvm;
2447         kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list;
2448
2449         for (i = 0; i < kvm_s390_fac_size(); i++) {
2450                 kvm->arch.model.fac_mask[i] = S390_lowcore.stfle_fac_list[i] &
2451                                               (kvm_s390_fac_base[i] |
2452                                                kvm_s390_fac_ext[i]);
2453                 kvm->arch.model.fac_list[i] = S390_lowcore.stfle_fac_list[i] &
2454                                               kvm_s390_fac_base[i];
2455         }
2456         kvm->arch.model.subfuncs = kvm_s390_available_subfunc;
2457
2458         /* we are always in czam mode - even on pre z14 machines */
2459         set_kvm_facility(kvm->arch.model.fac_mask, 138);
2460         set_kvm_facility(kvm->arch.model.fac_list, 138);
2461         /* we emulate STHYI in kvm */
2462         set_kvm_facility(kvm->arch.model.fac_mask, 74);
2463         set_kvm_facility(kvm->arch.model.fac_list, 74);
2464         if (MACHINE_HAS_TLB_GUEST) {
2465                 set_kvm_facility(kvm->arch.model.fac_mask, 147);
2466                 set_kvm_facility(kvm->arch.model.fac_list, 147);
2467         }
2468
2469         if (css_general_characteristics.aiv && test_facility(65))
2470                 set_kvm_facility(kvm->arch.model.fac_mask, 65);
2471
2472         kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid();
2473         kvm->arch.model.ibc = sclp.ibc & 0x0fff;
2474
2475         kvm_s390_crypto_init(kvm);
2476
2477         mutex_init(&kvm->arch.float_int.ais_lock);
2478         spin_lock_init(&kvm->arch.float_int.lock);
2479         for (i = 0; i < FIRQ_LIST_COUNT; i++)
2480                 INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]);
2481         init_waitqueue_head(&kvm->arch.ipte_wq);
2482         mutex_init(&kvm->arch.ipte_mutex);
2483
2484         debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
2485         VM_EVENT(kvm, 3, "vm created with type %lu", type);
2486
2487         if (type & KVM_VM_S390_UCONTROL) {
2488                 kvm->arch.gmap = NULL;
2489                 kvm->arch.mem_limit = KVM_S390_NO_MEM_LIMIT;
2490         } else {
2491                 if (sclp.hamax == U64_MAX)
2492                         kvm->arch.mem_limit = TASK_SIZE_MAX;
2493                 else
2494                         kvm->arch.mem_limit = min_t(unsigned long, TASK_SIZE_MAX,
2495                                                     sclp.hamax + 1);
2496                 kvm->arch.gmap = gmap_create(current->mm, kvm->arch.mem_limit - 1);
2497                 if (!kvm->arch.gmap)
2498                         goto out_err;
2499                 kvm->arch.gmap->private = kvm;
2500                 kvm->arch.gmap->pfault_enabled = 0;
2501         }
2502
2503         kvm->arch.use_pfmfi = sclp.has_pfmfi;
2504         kvm->arch.use_skf = sclp.has_skey;
2505         spin_lock_init(&kvm->arch.start_stop_lock);
2506         kvm_s390_vsie_init(kvm);
2507         kvm_s390_gisa_init(kvm);
2508         KVM_EVENT(3, "vm 0x%pK created by pid %u", kvm, current->pid);
2509
2510         return 0;
2511 out_err:
2512         free_page((unsigned long)kvm->arch.sie_page2);
2513         debug_unregister(kvm->arch.dbf);
2514         sca_dispose(kvm);
2515         KVM_EVENT(3, "creation of vm failed: %d", rc);
2516         return rc;
2517 }
2518
2519 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
2520 {
2521         VCPU_EVENT(vcpu, 3, "%s", "free cpu");
2522         trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
2523         kvm_s390_clear_local_irqs(vcpu);
2524         kvm_clear_async_pf_completion_queue(vcpu);
2525         if (!kvm_is_ucontrol(vcpu->kvm))
2526                 sca_del_vcpu(vcpu);
2527
2528         if (kvm_is_ucontrol(vcpu->kvm))
2529                 gmap_remove(vcpu->arch.gmap);
2530
2531         if (vcpu->kvm->arch.use_cmma)
2532                 kvm_s390_vcpu_unsetup_cmma(vcpu);
2533         free_page((unsigned long)(vcpu->arch.sie_block));
2534
2535         kvm_vcpu_uninit(vcpu);
2536         kmem_cache_free(kvm_vcpu_cache, vcpu);
2537 }
2538
2539 static void kvm_free_vcpus(struct kvm *kvm)
2540 {
2541         unsigned int i;
2542         struct kvm_vcpu *vcpu;
2543
2544         kvm_for_each_vcpu(i, vcpu, kvm)
2545                 kvm_arch_vcpu_destroy(vcpu);
2546
2547         mutex_lock(&kvm->lock);
2548         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
2549                 kvm->vcpus[i] = NULL;
2550
2551         atomic_set(&kvm->online_vcpus, 0);
2552         mutex_unlock(&kvm->lock);
2553 }
2554
2555 void kvm_arch_destroy_vm(struct kvm *kvm)
2556 {
2557         kvm_free_vcpus(kvm);
2558         sca_dispose(kvm);
2559         debug_unregister(kvm->arch.dbf);
2560         kvm_s390_gisa_destroy(kvm);
2561         free_page((unsigned long)kvm->arch.sie_page2);
2562         if (!kvm_is_ucontrol(kvm))
2563                 gmap_remove(kvm->arch.gmap);
2564         kvm_s390_destroy_adapters(kvm);
2565         kvm_s390_clear_float_irqs(kvm);
2566         kvm_s390_vsie_destroy(kvm);
2567         KVM_EVENT(3, "vm 0x%pK destroyed", kvm);
2568 }
2569
2570 /* Section: vcpu related */
2571 static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu)
2572 {
2573         vcpu->arch.gmap = gmap_create(current->mm, -1UL);
2574         if (!vcpu->arch.gmap)
2575                 return -ENOMEM;
2576         vcpu->arch.gmap->private = vcpu->kvm;
2577
2578         return 0;
2579 }
2580
2581 static void sca_del_vcpu(struct kvm_vcpu *vcpu)
2582 {
2583         if (!kvm_s390_use_sca_entries())
2584                 return;
2585         read_lock(&vcpu->kvm->arch.sca_lock);
2586         if (vcpu->kvm->arch.use_esca) {
2587                 struct esca_block *sca = vcpu->kvm->arch.sca;
2588
2589                 clear_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
2590                 sca->cpu[vcpu->vcpu_id].sda = 0;
2591         } else {
2592                 struct bsca_block *sca = vcpu->kvm->arch.sca;
2593
2594                 clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
2595                 sca->cpu[vcpu->vcpu_id].sda = 0;
2596         }
2597         read_unlock(&vcpu->kvm->arch.sca_lock);
2598 }
2599
2600 static void sca_add_vcpu(struct kvm_vcpu *vcpu)
2601 {
2602         if (!kvm_s390_use_sca_entries()) {
2603                 struct bsca_block *sca = vcpu->kvm->arch.sca;
2604
2605                 /* we still need the basic sca for the ipte control */
2606                 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
2607                 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
2608                 return;
2609         }
2610         read_lock(&vcpu->kvm->arch.sca_lock);
2611         if (vcpu->kvm->arch.use_esca) {
2612                 struct esca_block *sca = vcpu->kvm->arch.sca;
2613
2614                 sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
2615                 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
2616                 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca & ~0x3fU;
2617                 vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
2618                 set_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
2619         } else {
2620                 struct bsca_block *sca = vcpu->kvm->arch.sca;
2621
2622                 sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
2623                 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
2624                 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
2625                 set_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
2626         }
2627         read_unlock(&vcpu->kvm->arch.sca_lock);
2628 }
2629
2630 /* Basic SCA to Extended SCA data copy routines */
2631 static inline void sca_copy_entry(struct esca_entry *d, struct bsca_entry *s)
2632 {
2633         d->sda = s->sda;
2634         d->sigp_ctrl.c = s->sigp_ctrl.c;
2635         d->sigp_ctrl.scn = s->sigp_ctrl.scn;
2636 }
2637
2638 static void sca_copy_b_to_e(struct esca_block *d, struct bsca_block *s)
2639 {
2640         int i;
2641
2642         d->ipte_control = s->ipte_control;
2643         d->mcn[0] = s->mcn;
2644         for (i = 0; i < KVM_S390_BSCA_CPU_SLOTS; i++)
2645                 sca_copy_entry(&d->cpu[i], &s->cpu[i]);
2646 }
2647
2648 static int sca_switch_to_extended(struct kvm *kvm)
2649 {
2650         struct bsca_block *old_sca = kvm->arch.sca;
2651         struct esca_block *new_sca;
2652         struct kvm_vcpu *vcpu;
2653         unsigned int vcpu_idx;
2654         u32 scaol, scaoh;
2655
2656         new_sca = alloc_pages_exact(sizeof(*new_sca), GFP_KERNEL|__GFP_ZERO);
2657         if (!new_sca)
2658                 return -ENOMEM;
2659
2660         scaoh = (u32)((u64)(new_sca) >> 32);
2661         scaol = (u32)(u64)(new_sca) & ~0x3fU;
2662
2663         kvm_s390_vcpu_block_all(kvm);
2664         write_lock(&kvm->arch.sca_lock);
2665
2666         sca_copy_b_to_e(new_sca, old_sca);
2667
2668         kvm_for_each_vcpu(vcpu_idx, vcpu, kvm) {
2669                 vcpu->arch.sie_block->scaoh = scaoh;
2670                 vcpu->arch.sie_block->scaol = scaol;
2671                 vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
2672         }
2673         kvm->arch.sca = new_sca;
2674         kvm->arch.use_esca = 1;
2675
2676         write_unlock(&kvm->arch.sca_lock);
2677         kvm_s390_vcpu_unblock_all(kvm);
2678
2679         free_page((unsigned long)old_sca);
2680
2681         VM_EVENT(kvm, 2, "Switched to ESCA (0x%pK -> 0x%pK)",
2682                  old_sca, kvm->arch.sca);
2683         return 0;
2684 }
2685
2686 static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)
2687 {
2688         int rc;
2689
2690         if (!kvm_s390_use_sca_entries()) {
2691                 if (id < KVM_MAX_VCPUS)
2692                         return true;
2693                 return false;
2694         }
2695         if (id < KVM_S390_BSCA_CPU_SLOTS)
2696                 return true;
2697         if (!sclp.has_esca || !sclp.has_64bscao)
2698                 return false;
2699
2700         mutex_lock(&kvm->lock);
2701         rc = kvm->arch.use_esca ? 0 : sca_switch_to_extended(kvm);
2702         mutex_unlock(&kvm->lock);
2703
2704         return rc == 0 && id < KVM_S390_ESCA_CPU_SLOTS;
2705 }
2706
2707 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
2708 {
2709         vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
2710         kvm_clear_async_pf_completion_queue(vcpu);
2711         vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
2712                                     KVM_SYNC_GPRS |
2713                                     KVM_SYNC_ACRS |
2714                                     KVM_SYNC_CRS |
2715                                     KVM_SYNC_ARCH0 |
2716                                     KVM_SYNC_PFAULT;
2717         kvm_s390_set_prefix(vcpu, 0);
2718         if (test_kvm_facility(vcpu->kvm, 64))
2719                 vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;
2720         if (test_kvm_facility(vcpu->kvm, 82))
2721                 vcpu->run->kvm_valid_regs |= KVM_SYNC_BPBC;
2722         if (test_kvm_facility(vcpu->kvm, 133))
2723                 vcpu->run->kvm_valid_regs |= KVM_SYNC_GSCB;
2724         if (test_kvm_facility(vcpu->kvm, 156))
2725                 vcpu->run->kvm_valid_regs |= KVM_SYNC_ETOKEN;
2726         /* fprs can be synchronized via vrs, even if the guest has no vx. With
2727          * MACHINE_HAS_VX, (load|store)_fpu_regs() will work with vrs format.
2728          */
2729         if (MACHINE_HAS_VX)
2730                 vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS;
2731         else
2732                 vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS;
2733
2734         if (kvm_is_ucontrol(vcpu->kvm))
2735                 return __kvm_ucontrol_vcpu_init(vcpu);
2736
2737         return 0;
2738 }
2739
2740 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2741 static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2742 {
2743         WARN_ON_ONCE(vcpu->arch.cputm_start != 0);
2744         raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2745         vcpu->arch.cputm_start = get_tod_clock_fast();
2746         raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2747 }
2748
2749 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2750 static void __stop_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2751 {
2752         WARN_ON_ONCE(vcpu->arch.cputm_start == 0);
2753         raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2754         vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start;
2755         vcpu->arch.cputm_start = 0;
2756         raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2757 }
2758
2759 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2760 static void __enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2761 {
2762         WARN_ON_ONCE(vcpu->arch.cputm_enabled);
2763         vcpu->arch.cputm_enabled = true;
2764         __start_cpu_timer_accounting(vcpu);
2765 }
2766
2767 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
2768 static void __disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2769 {
2770         WARN_ON_ONCE(!vcpu->arch.cputm_enabled);
2771         __stop_cpu_timer_accounting(vcpu);
2772         vcpu->arch.cputm_enabled = false;
2773 }
2774
2775 static void enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2776 {
2777         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2778         __enable_cpu_timer_accounting(vcpu);
2779         preempt_enable();
2780 }
2781
2782 static void disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
2783 {
2784         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2785         __disable_cpu_timer_accounting(vcpu);
2786         preempt_enable();
2787 }
2788
2789 /* set the cpu timer - may only be called from the VCPU thread itself */
2790 void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm)
2791 {
2792         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2793         raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
2794         if (vcpu->arch.cputm_enabled)
2795                 vcpu->arch.cputm_start = get_tod_clock_fast();
2796         vcpu->arch.sie_block->cputm = cputm;
2797         raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
2798         preempt_enable();
2799 }
2800
2801 /* update and get the cpu timer - can also be called from other VCPU threads */
2802 __u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu)
2803 {
2804         unsigned int seq;
2805         __u64 value;
2806
2807         if (unlikely(!vcpu->arch.cputm_enabled))
2808                 return vcpu->arch.sie_block->cputm;
2809
2810         preempt_disable(); /* protect from TOD sync and vcpu_load/put */
2811         do {
2812                 seq = raw_read_seqcount(&vcpu->arch.cputm_seqcount);
2813                 /*
2814                  * If the writer would ever execute a read in the critical
2815                  * section, e.g. in irq context, we have a deadlock.
2816                  */
2817                 WARN_ON_ONCE((seq & 1) && smp_processor_id() == vcpu->cpu);
2818                 value = vcpu->arch.sie_block->cputm;
2819                 /* if cputm_start is 0, accounting is being started/stopped */
2820                 if (likely(vcpu->arch.cputm_start))
2821                         value -= get_tod_clock_fast() - vcpu->arch.cputm_start;
2822         } while (read_seqcount_retry(&vcpu->arch.cputm_seqcount, seq & ~1));
2823         preempt_enable();
2824         return value;
2825 }
2826
2827 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
2828 {
2829
2830         gmap_enable(vcpu->arch.enabled_gmap);
2831         kvm_s390_set_cpuflags(vcpu, CPUSTAT_RUNNING);
2832         if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
2833                 __start_cpu_timer_accounting(vcpu);
2834         vcpu->cpu = cpu;
2835 }
2836
2837 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
2838 {
2839         vcpu->cpu = -1;
2840         if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
2841                 __stop_cpu_timer_accounting(vcpu);
2842         kvm_s390_clear_cpuflags(vcpu, CPUSTAT_RUNNING);
2843         vcpu->arch.enabled_gmap = gmap_get_enabled();
2844         gmap_disable(vcpu->arch.enabled_gmap);
2845
2846 }
2847
2848 static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
2849 {
2850         /* this equals initial cpu reset in pop, but we don't switch to ESA */
2851         vcpu->arch.sie_block->gpsw.mask = 0UL;
2852         vcpu->arch.sie_block->gpsw.addr = 0UL;
2853         kvm_s390_set_prefix(vcpu, 0);
2854         kvm_s390_set_cpu_timer(vcpu, 0);
2855         vcpu->arch.sie_block->ckc       = 0UL;
2856         vcpu->arch.sie_block->todpr     = 0;
2857         memset(vcpu->arch.sie_block->gcr, 0, 16 * sizeof(__u64));
2858         vcpu->arch.sie_block->gcr[0]  = CR0_UNUSED_56 |
2859                                         CR0_INTERRUPT_KEY_SUBMASK |
2860                                         CR0_MEASUREMENT_ALERT_SUBMASK;
2861         vcpu->arch.sie_block->gcr[14] = CR14_UNUSED_32 |
2862                                         CR14_UNUSED_33 |
2863                                         CR14_EXTERNAL_DAMAGE_SUBMASK;
2864         /* make sure the new fpc will be lazily loaded */
2865         save_fpu_regs();
2866         current->thread.fpu.fpc = 0;
2867         vcpu->arch.sie_block->gbea = 1;
2868         vcpu->arch.sie_block->pp = 0;
2869         vcpu->arch.sie_block->fpf &= ~FPF_BPBC;
2870         vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
2871         kvm_clear_async_pf_completion_queue(vcpu);
2872         if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
2873                 kvm_s390_vcpu_stop(vcpu);
2874         kvm_s390_clear_local_irqs(vcpu);
2875 }
2876
2877 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
2878 {
2879         mutex_lock(&vcpu->kvm->lock);
2880         preempt_disable();
2881         vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch;
2882         vcpu->arch.sie_block->epdx = vcpu->kvm->arch.epdx;
2883         preempt_enable();
2884         mutex_unlock(&vcpu->kvm->lock);
2885         if (!kvm_is_ucontrol(vcpu->kvm)) {
2886                 vcpu->arch.gmap = vcpu->kvm->arch.gmap;
2887                 sca_add_vcpu(vcpu);
2888         }
2889         if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0)
2890                 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
2891         /* make vcpu_load load the right gmap on the first trigger */
2892         vcpu->arch.enabled_gmap = vcpu->arch.gmap;
2893 }
2894
2895 static bool kvm_has_pckmo_subfunc(struct kvm *kvm, unsigned long nr)
2896 {
2897         if (test_bit_inv(nr, (unsigned long *)&kvm->arch.model.subfuncs.pckmo) &&
2898             test_bit_inv(nr, (unsigned long *)&kvm_s390_available_subfunc.pckmo))
2899                 return true;
2900         return false;
2901 }
2902
2903 static bool kvm_has_pckmo_ecc(struct kvm *kvm)
2904 {
2905         /* At least one ECC subfunction must be present */
2906         return kvm_has_pckmo_subfunc(kvm, 32) ||
2907                kvm_has_pckmo_subfunc(kvm, 33) ||
2908                kvm_has_pckmo_subfunc(kvm, 34) ||
2909                kvm_has_pckmo_subfunc(kvm, 40) ||
2910                kvm_has_pckmo_subfunc(kvm, 41);
2911
2912 }
2913
2914 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
2915 {
2916         /*
2917          * If the AP instructions are not being interpreted and the MSAX3
2918          * facility is not configured for the guest, there is nothing to set up.
2919          */
2920         if (!vcpu->kvm->arch.crypto.apie && !test_kvm_facility(vcpu->kvm, 76))
2921                 return;
2922
2923         vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd;
2924         vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA);
2925         vcpu->arch.sie_block->eca &= ~ECA_APIE;
2926         vcpu->arch.sie_block->ecd &= ~ECD_ECC;
2927
2928         if (vcpu->kvm->arch.crypto.apie)
2929                 vcpu->arch.sie_block->eca |= ECA_APIE;
2930
2931         /* Set up protected key support */
2932         if (vcpu->kvm->arch.crypto.aes_kw) {
2933                 vcpu->arch.sie_block->ecb3 |= ECB3_AES;
2934                 /* ecc is also wrapped with AES key */
2935                 if (kvm_has_pckmo_ecc(vcpu->kvm))
2936                         vcpu->arch.sie_block->ecd |= ECD_ECC;
2937         }
2938
2939         if (vcpu->kvm->arch.crypto.dea_kw)
2940                 vcpu->arch.sie_block->ecb3 |= ECB3_DEA;
2941 }
2942
2943 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu)
2944 {
2945         free_page(vcpu->arch.sie_block->cbrlo);
2946         vcpu->arch.sie_block->cbrlo = 0;
2947 }
2948
2949 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu)
2950 {
2951         vcpu->arch.sie_block->cbrlo = get_zeroed_page(GFP_KERNEL);
2952         if (!vcpu->arch.sie_block->cbrlo)
2953                 return -ENOMEM;
2954         return 0;
2955 }
2956
2957 static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu)
2958 {
2959         struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model;
2960
2961         vcpu->arch.sie_block->ibc = model->ibc;
2962         if (test_kvm_facility(vcpu->kvm, 7))
2963                 vcpu->arch.sie_block->fac = (u32)(u64) model->fac_list;
2964 }
2965
2966 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
2967 {
2968         int rc = 0;
2969
2970         atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
2971                                                     CPUSTAT_SM |
2972                                                     CPUSTAT_STOPPED);
2973
2974         if (test_kvm_facility(vcpu->kvm, 78))
2975                 kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED2);
2976         else if (test_kvm_facility(vcpu->kvm, 8))
2977                 kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED);
2978
2979         kvm_s390_vcpu_setup_model(vcpu);
2980
2981         /* pgste_set_pte has special handling for !MACHINE_HAS_ESOP */
2982         if (MACHINE_HAS_ESOP)
2983                 vcpu->arch.sie_block->ecb |= ECB_HOSTPROTINT;
2984         if (test_kvm_facility(vcpu->kvm, 9))
2985                 vcpu->arch.sie_block->ecb |= ECB_SRSI;
2986         if (test_kvm_facility(vcpu->kvm, 73))
2987                 vcpu->arch.sie_block->ecb |= ECB_TE;
2988
2989         if (test_kvm_facility(vcpu->kvm, 8) && vcpu->kvm->arch.use_pfmfi)
2990                 vcpu->arch.sie_block->ecb2 |= ECB2_PFMFI;
2991         if (test_kvm_facility(vcpu->kvm, 130))
2992                 vcpu->arch.sie_block->ecb2 |= ECB2_IEP;
2993         vcpu->arch.sie_block->eca = ECA_MVPGI | ECA_PROTEXCI;
2994         if (sclp.has_cei)
2995                 vcpu->arch.sie_block->eca |= ECA_CEI;
2996         if (sclp.has_ib)
2997                 vcpu->arch.sie_block->eca |= ECA_IB;
2998         if (sclp.has_siif)
2999                 vcpu->arch.sie_block->eca |= ECA_SII;
3000         if (sclp.has_sigpif)
3001                 vcpu->arch.sie_block->eca |= ECA_SIGPI;
3002         if (test_kvm_facility(vcpu->kvm, 129)) {
3003                 vcpu->arch.sie_block->eca |= ECA_VX;
3004                 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
3005         }
3006         if (test_kvm_facility(vcpu->kvm, 139))
3007                 vcpu->arch.sie_block->ecd |= ECD_MEF;
3008         if (test_kvm_facility(vcpu->kvm, 156))
3009                 vcpu->arch.sie_block->ecd |= ECD_ETOKENF;
3010         if (vcpu->arch.sie_block->gd) {
3011                 vcpu->arch.sie_block->eca |= ECA_AIV;
3012                 VCPU_EVENT(vcpu, 3, "AIV gisa format-%u enabled for cpu %03u",
3013                            vcpu->arch.sie_block->gd & 0x3, vcpu->vcpu_id);
3014         }
3015         vcpu->arch.sie_block->sdnxo = ((unsigned long) &vcpu->run->s.regs.sdnx)
3016                                         | SDNXC;
3017         vcpu->arch.sie_block->riccbd = (unsigned long) &vcpu->run->s.regs.riccb;
3018
3019         if (sclp.has_kss)
3020                 kvm_s390_set_cpuflags(vcpu, CPUSTAT_KSS);
3021         else
3022                 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
3023
3024         if (vcpu->kvm->arch.use_cmma) {
3025                 rc = kvm_s390_vcpu_setup_cmma(vcpu);
3026                 if (rc)
3027                         return rc;
3028         }
3029         hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
3030         vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
3031
3032         vcpu->arch.sie_block->hpid = HPID_KVM;
3033
3034         kvm_s390_vcpu_crypto_setup(vcpu);
3035
3036         return rc;
3037 }
3038
3039 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
3040                                       unsigned int id)
3041 {
3042         struct kvm_vcpu *vcpu;
3043         struct sie_page *sie_page;
3044         int rc = -EINVAL;
3045
3046         if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id))
3047                 goto out;
3048
3049         rc = -ENOMEM;
3050
3051         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
3052         if (!vcpu)
3053                 goto out;
3054
3055         BUILD_BUG_ON(sizeof(struct sie_page) != 4096);
3056         sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL);
3057         if (!sie_page)
3058                 goto out_free_cpu;
3059
3060         vcpu->arch.sie_block = &sie_page->sie_block;
3061         vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb;
3062
3063         /* the real guest size will always be smaller than msl */
3064         vcpu->arch.sie_block->mso = 0;
3065         vcpu->arch.sie_block->msl = sclp.hamax;
3066
3067         vcpu->arch.sie_block->icpua = id;
3068         spin_lock_init(&vcpu->arch.local_int.lock);
3069         vcpu->arch.sie_block->gd = (u32)(u64)kvm->arch.gisa_int.origin;
3070         if (vcpu->arch.sie_block->gd && sclp.has_gisaf)
3071                 vcpu->arch.sie_block->gd |= GISA_FORMAT1;
3072         seqcount_init(&vcpu->arch.cputm_seqcount);
3073
3074         rc = kvm_vcpu_init(vcpu, kvm, id);
3075         if (rc)
3076                 goto out_free_sie_block;
3077         VM_EVENT(kvm, 3, "create cpu %d at 0x%pK, sie block at 0x%pK", id, vcpu,
3078                  vcpu->arch.sie_block);
3079         trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block);
3080
3081         return vcpu;
3082 out_free_sie_block:
3083         free_page((unsigned long)(vcpu->arch.sie_block));
3084 out_free_cpu:
3085         kmem_cache_free(kvm_vcpu_cache, vcpu);
3086 out:
3087         return ERR_PTR(rc);
3088 }
3089
3090 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
3091 {
3092         return kvm_s390_vcpu_has_irq(vcpu, 0);
3093 }
3094
3095 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
3096 {
3097         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE);
3098 }
3099
3100 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu)
3101 {
3102         atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
3103         exit_sie(vcpu);
3104 }
3105
3106 void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu)
3107 {
3108         atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
3109 }
3110
3111 static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu)
3112 {
3113         atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
3114         exit_sie(vcpu);
3115 }
3116
3117 bool kvm_s390_vcpu_sie_inhibited(struct kvm_vcpu *vcpu)
3118 {
3119         return atomic_read(&vcpu->arch.sie_block->prog20) &
3120                (PROG_BLOCK_SIE | PROG_REQUEST);
3121 }
3122
3123 static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu)
3124 {
3125         atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
3126 }
3127
3128 /*
3129  * Kick a guest cpu out of (v)SIE and wait until (v)SIE is not running.
3130  * If the CPU is not running (e.g. waiting as idle) the function will
3131  * return immediately. */
3132 void exit_sie(struct kvm_vcpu *vcpu)
3133 {
3134         kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
3135         kvm_s390_vsie_kick(vcpu);
3136         while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE)
3137                 cpu_relax();
3138 }
3139
3140 /* Kick a guest cpu out of SIE to process a request synchronously */
3141 void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu)
3142 {
3143         kvm_make_request(req, vcpu);
3144         kvm_s390_vcpu_request(vcpu);
3145 }
3146
3147 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
3148                               unsigned long end)
3149 {
3150         struct kvm *kvm = gmap->private;
3151         struct kvm_vcpu *vcpu;
3152         unsigned long prefix;
3153         int i;
3154
3155         if (gmap_is_shadow(gmap))
3156                 return;
3157         if (start >= 1UL << 31)
3158                 /* We are only interested in prefix pages */
3159                 return;
3160         kvm_for_each_vcpu(i, vcpu, kvm) {
3161                 /* match against both prefix pages */
3162                 prefix = kvm_s390_get_prefix(vcpu);
3163                 if (prefix <= end && start <= prefix + 2*PAGE_SIZE - 1) {
3164                         VCPU_EVENT(vcpu, 2, "gmap notifier for %lx-%lx",
3165                                    start, end);
3166                         kvm_s390_sync_request(KVM_REQ_MMU_RELOAD, vcpu);
3167                 }
3168         }
3169 }
3170
3171 bool kvm_arch_no_poll(struct kvm_vcpu *vcpu)
3172 {
3173         /* do not poll with more than halt_poll_max_steal percent of steal time */
3174         if (S390_lowcore.avg_steal_timer * 100 / (TICK_USEC << 12) >=
3175             halt_poll_max_steal) {
3176                 vcpu->stat.halt_no_poll_steal++;
3177                 return true;
3178         }
3179         return false;
3180 }
3181
3182 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
3183 {
3184         /* kvm common code refers to this, but never calls it */
3185         BUG();
3186         return 0;
3187 }
3188
3189 static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
3190                                            struct kvm_one_reg *reg)
3191 {
3192         int r = -EINVAL;
3193
3194         switch (reg->id) {
3195         case KVM_REG_S390_TODPR:
3196                 r = put_user(vcpu->arch.sie_block->todpr,
3197                              (u32 __user *)reg->addr);
3198                 break;
3199         case KVM_REG_S390_EPOCHDIFF:
3200                 r = put_user(vcpu->arch.sie_block->epoch,
3201                              (u64 __user *)reg->addr);
3202                 break;
3203         case KVM_REG_S390_CPU_TIMER:
3204                 r = put_user(kvm_s390_get_cpu_timer(vcpu),
3205                              (u64 __user *)reg->addr);
3206                 break;
3207         case KVM_REG_S390_CLOCK_COMP:
3208                 r = put_user(vcpu->arch.sie_block->ckc,
3209                              (u64 __user *)reg->addr);
3210                 break;
3211         case KVM_REG_S390_PFTOKEN:
3212                 r = put_user(vcpu->arch.pfault_token,
3213                              (u64 __user *)reg->addr);
3214                 break;
3215         case KVM_REG_S390_PFCOMPARE:
3216                 r = put_user(vcpu->arch.pfault_compare,
3217                              (u64 __user *)reg->addr);
3218                 break;
3219         case KVM_REG_S390_PFSELECT:
3220                 r = put_user(vcpu->arch.pfault_select,
3221                              (u64 __user *)reg->addr);
3222                 break;
3223         case KVM_REG_S390_PP:
3224                 r = put_user(vcpu->arch.sie_block->pp,
3225                              (u64 __user *)reg->addr);
3226                 break;
3227         case KVM_REG_S390_GBEA:
3228                 r = put_user(vcpu->arch.sie_block->gbea,
3229                              (u64 __user *)reg->addr);
3230                 break;
3231         default:
3232                 break;
3233         }
3234
3235         return r;
3236 }
3237
3238 static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
3239                                            struct kvm_one_reg *reg)
3240 {
3241         int r = -EINVAL;
3242         __u64 val;
3243
3244         switch (reg->id) {
3245         case KVM_REG_S390_TODPR:
3246                 r = get_user(vcpu->arch.sie_block->todpr,
3247                              (u32 __user *)reg->addr);
3248                 break;
3249         case KVM_REG_S390_EPOCHDIFF:
3250                 r = get_user(vcpu->arch.sie_block->epoch,
3251                              (u64 __user *)reg->addr);
3252                 break;
3253         case KVM_REG_S390_CPU_TIMER:
3254                 r = get_user(val, (u64 __user *)reg->addr);
3255                 if (!r)
3256                         kvm_s390_set_cpu_timer(vcpu, val);
3257                 break;
3258         case KVM_REG_S390_CLOCK_COMP:
3259                 r = get_user(vcpu->arch.sie_block->ckc,
3260                              (u64 __user *)reg->addr);
3261                 break;
3262         case KVM_REG_S390_PFTOKEN:
3263                 r = get_user(vcpu->arch.pfault_token,
3264                              (u64 __user *)reg->addr);
3265                 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
3266                         kvm_clear_async_pf_completion_queue(vcpu);
3267                 break;
3268         case KVM_REG_S390_PFCOMPARE:
3269                 r = get_user(vcpu->arch.pfault_compare,
3270                              (u64 __user *)reg->addr);
3271                 break;
3272         case KVM_REG_S390_PFSELECT:
3273                 r = get_user(vcpu->arch.pfault_select,
3274                              (u64 __user *)reg->addr);
3275                 break;
3276         case KVM_REG_S390_PP:
3277                 r = get_user(vcpu->arch.sie_block->pp,
3278                              (u64 __user *)reg->addr);
3279                 break;
3280         case KVM_REG_S390_GBEA:
3281                 r = get_user(vcpu->arch.sie_block->gbea,
3282                              (u64 __user *)reg->addr);
3283                 break;
3284         default:
3285                 break;
3286         }
3287
3288         return r;
3289 }
3290
3291 static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
3292 {
3293         kvm_s390_vcpu_initial_reset(vcpu);
3294         return 0;
3295 }
3296
3297 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
3298 {
3299         vcpu_load(vcpu);
3300         memcpy(&vcpu->run->s.regs.gprs, &regs->gprs, sizeof(regs->gprs));
3301         vcpu_put(vcpu);
3302         return 0;
3303 }
3304
3305 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
3306 {
3307         vcpu_load(vcpu);
3308         memcpy(&regs->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs));
3309         vcpu_put(vcpu);
3310         return 0;
3311 }
3312
3313 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
3314                                   struct kvm_sregs *sregs)
3315 {
3316         vcpu_load(vcpu);
3317
3318         memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs));
3319         memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));
3320
3321         vcpu_put(vcpu);
3322         return 0;
3323 }
3324
3325 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
3326                                   struct kvm_sregs *sregs)
3327 {
3328         vcpu_load(vcpu);
3329
3330         memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs));
3331         memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs));
3332
3333         vcpu_put(vcpu);
3334         return 0;
3335 }
3336
3337 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
3338 {
3339         int ret = 0;
3340
3341         vcpu_load(vcpu);
3342
3343         if (test_fp_ctl(fpu->fpc)) {
3344                 ret = -EINVAL;
3345                 goto out;
3346         }
3347         vcpu->run->s.regs.fpc = fpu->fpc;
3348         if (MACHINE_HAS_VX)
3349                 convert_fp_to_vx((__vector128 *) vcpu->run->s.regs.vrs,
3350                                  (freg_t *) fpu->fprs);
3351         else
3352                 memcpy(vcpu->run->s.regs.fprs, &fpu->fprs, sizeof(fpu->fprs));
3353
3354 out:
3355         vcpu_put(vcpu);
3356         return ret;
3357 }
3358
3359 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
3360 {
3361         vcpu_load(vcpu);
3362
3363         /* make sure we have the latest values */
3364         save_fpu_regs();
3365         if (MACHINE_HAS_VX)
3366                 convert_vx_to_fp((freg_t *) fpu->fprs,
3367                                  (__vector128 *) vcpu->run->s.regs.vrs);
3368         else
3369                 memcpy(fpu->fprs, vcpu->run->s.regs.fprs, sizeof(fpu->fprs));
3370         fpu->fpc = vcpu->run->s.regs.fpc;
3371
3372         vcpu_put(vcpu);
3373         return 0;
3374 }
3375
3376 static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
3377 {
3378         int rc = 0;
3379
3380         if (!is_vcpu_stopped(vcpu))
3381                 rc = -EBUSY;
3382         else {
3383                 vcpu->run->psw_mask = psw.mask;
3384                 vcpu->run->psw_addr = psw.addr;
3385         }
3386         return rc;
3387 }
3388
3389 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
3390                                   struct kvm_translation *tr)
3391 {
3392         return -EINVAL; /* not implemented yet */
3393 }
3394
3395 #define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \
3396                               KVM_GUESTDBG_USE_HW_BP | \
3397                               KVM_GUESTDBG_ENABLE)
3398
3399 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
3400                                         struct kvm_guest_debug *dbg)
3401 {
3402         int rc = 0;
3403
3404         vcpu_load(vcpu);
3405
3406         vcpu->guest_debug = 0;
3407         kvm_s390_clear_bp_data(vcpu);
3408
3409         if (dbg->control & ~VALID_GUESTDBG_FLAGS) {
3410                 rc = -EINVAL;
3411                 goto out;
3412         }
3413         if (!sclp.has_gpere) {
3414                 rc = -EINVAL;
3415                 goto out;
3416         }
3417
3418         if (dbg->control & KVM_GUESTDBG_ENABLE) {
3419                 vcpu->guest_debug = dbg->control;
3420                 /* enforce guest PER */
3421                 kvm_s390_set_cpuflags(vcpu, CPUSTAT_P);
3422
3423                 if (dbg->control & KVM_GUESTDBG_USE_HW_BP)
3424                         rc = kvm_s390_import_bp_data(vcpu, dbg);
3425         } else {
3426                 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P);
3427                 vcpu->arch.guestdbg.last_bp = 0;
3428         }
3429
3430         if (rc) {
3431                 vcpu->guest_debug = 0;
3432                 kvm_s390_clear_bp_data(vcpu);
3433                 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P);
3434         }
3435
3436 out:
3437         vcpu_put(vcpu);
3438         return rc;
3439 }
3440
3441 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
3442                                     struct kvm_mp_state *mp_state)
3443 {
3444         int ret;
3445
3446         vcpu_load(vcpu);
3447
3448         /* CHECK_STOP and LOAD are not supported yet */
3449         ret = is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED :
3450                                       KVM_MP_STATE_OPERATING;
3451
3452         vcpu_put(vcpu);
3453         return ret;
3454 }
3455
3456 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
3457                                     struct kvm_mp_state *mp_state)
3458 {
3459         int rc = 0;
3460
3461         vcpu_load(vcpu);
3462
3463         /* user space knows about this interface - let it control the state */
3464         vcpu->kvm->arch.user_cpu_state_ctrl = 1;
3465
3466         switch (mp_state->mp_state) {
3467         case KVM_MP_STATE_STOPPED:
3468                 kvm_s390_vcpu_stop(vcpu);
3469                 break;
3470         case KVM_MP_STATE_OPERATING:
3471                 kvm_s390_vcpu_start(vcpu);
3472                 break;
3473         case KVM_MP_STATE_LOAD:
3474         case KVM_MP_STATE_CHECK_STOP:
3475                 /* fall through - CHECK_STOP and LOAD are not supported yet */
3476         default:
3477                 rc = -ENXIO;
3478         }
3479
3480         vcpu_put(vcpu);
3481         return rc;
3482 }
3483
3484 static bool ibs_enabled(struct kvm_vcpu *vcpu)
3485 {
3486         return kvm_s390_test_cpuflags(vcpu, CPUSTAT_IBS);
3487 }
3488
3489 static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
3490 {
3491 retry:
3492         kvm_s390_vcpu_request_handled(vcpu);
3493         if (!kvm_request_pending(vcpu))
3494                 return 0;
3495         /*
3496          * We use MMU_RELOAD just to re-arm the ipte notifier for the
3497          * guest prefix page. gmap_mprotect_notify will wait on the ptl lock.
3498          * This ensures that the ipte instruction for this request has
3499          * already finished. We might race against a second unmapper that
3500          * wants to set the blocking bit. Lets just retry the request loop.
3501          */
3502         if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) {
3503                 int rc;
3504                 rc = gmap_mprotect_notify(vcpu->arch.gmap,
3505                                           kvm_s390_get_prefix(vcpu),
3506                                           PAGE_SIZE * 2, PROT_WRITE);
3507                 if (rc) {
3508                         kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
3509                         return rc;
3510                 }
3511                 goto retry;
3512         }
3513
3514         if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
3515                 vcpu->arch.sie_block->ihcpu = 0xffff;
3516                 goto retry;
3517         }
3518
3519         if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) {
3520                 if (!ibs_enabled(vcpu)) {
3521                         trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1);
3522                         kvm_s390_set_cpuflags(vcpu, CPUSTAT_IBS);
3523                 }
3524                 goto retry;
3525         }
3526
3527         if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) {
3528                 if (ibs_enabled(vcpu)) {
3529                         trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0);
3530                         kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IBS);
3531                 }
3532                 goto retry;
3533         }
3534
3535         if (kvm_check_request(KVM_REQ_ICPT_OPEREXC, vcpu)) {
3536                 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
3537                 goto retry;
3538         }
3539
3540         if (kvm_check_request(KVM_REQ_START_MIGRATION, vcpu)) {
3541                 /*
3542                  * Disable CMM virtualization; we will emulate the ESSA
3543                  * instruction manually, in order to provide additional
3544                  * functionalities needed for live migration.
3545                  */
3546                 vcpu->arch.sie_block->ecb2 &= ~ECB2_CMMA;
3547                 goto retry;
3548         }
3549
3550         if (kvm_check_request(KVM_REQ_STOP_MIGRATION, vcpu)) {
3551                 /*
3552                  * Re-enable CMM virtualization if CMMA is available and
3553                  * CMM has been used.
3554                  */
3555                 if ((vcpu->kvm->arch.use_cmma) &&
3556                     (vcpu->kvm->mm->context.uses_cmm))
3557                         vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
3558                 goto retry;
3559         }
3560
3561         /* nothing to do, just clear the request */
3562         kvm_clear_request(KVM_REQ_UNHALT, vcpu);
3563         /* we left the vsie handler, nothing to do, just clear the request */
3564         kvm_clear_request(KVM_REQ_VSIE_RESTART, vcpu);
3565
3566         return 0;
3567 }
3568
3569 void kvm_s390_set_tod_clock(struct kvm *kvm,
3570                             const struct kvm_s390_vm_tod_clock *gtod)
3571 {
3572         struct kvm_vcpu *vcpu;
3573         struct kvm_s390_tod_clock_ext htod;
3574         int i;
3575
3576         mutex_lock(&kvm->lock);
3577         preempt_disable();
3578
3579         get_tod_clock_ext((char *)&htod);
3580
3581         kvm->arch.epoch = gtod->tod - htod.tod;
3582         kvm->arch.epdx = 0;
3583         if (test_kvm_facility(kvm, 139)) {
3584                 kvm->arch.epdx = gtod->epoch_idx - htod.epoch_idx;
3585                 if (kvm->arch.epoch > gtod->tod)
3586                         kvm->arch.epdx -= 1;
3587         }
3588
3589         kvm_s390_vcpu_block_all(kvm);
3590         kvm_for_each_vcpu(i, vcpu, kvm) {
3591                 vcpu->arch.sie_block->epoch = kvm->arch.epoch;
3592                 vcpu->arch.sie_block->epdx  = kvm->arch.epdx;
3593         }
3594
3595         kvm_s390_vcpu_unblock_all(kvm);
3596         preempt_enable();
3597         mutex_unlock(&kvm->lock);
3598 }
3599
3600 /**
3601  * kvm_arch_fault_in_page - fault-in guest page if necessary
3602  * @vcpu: The corresponding virtual cpu
3603  * @gpa: Guest physical address
3604  * @writable: Whether the page should be writable or not
3605  *
3606  * Make sure that a guest page has been faulted-in on the host.
3607  *
3608  * Return: Zero on success, negative error code otherwise.
3609  */
3610 long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable)
3611 {
3612         return gmap_fault(vcpu->arch.gmap, gpa,
3613                           writable ? FAULT_FLAG_WRITE : 0);
3614 }
3615
3616 static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token,
3617                                       unsigned long token)
3618 {
3619         struct kvm_s390_interrupt inti;
3620         struct kvm_s390_irq irq;
3621
3622         if (start_token) {
3623                 irq.u.ext.ext_params2 = token;
3624                 irq.type = KVM_S390_INT_PFAULT_INIT;
3625                 WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq));
3626         } else {
3627                 inti.type = KVM_S390_INT_PFAULT_DONE;
3628                 inti.parm64 = token;
3629                 WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti));
3630         }
3631 }
3632
3633 void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
3634                                      struct kvm_async_pf *work)
3635 {
3636         trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token);
3637         __kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token);
3638 }
3639
3640 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
3641                                  struct kvm_async_pf *work)
3642 {
3643         trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token);
3644         __kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token);
3645 }
3646
3647 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu,
3648                                struct kvm_async_pf *work)
3649 {
3650         /* s390 will always inject the page directly */
3651 }
3652
3653 bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu)
3654 {
3655         /*
3656          * s390 will always inject the page directly,
3657          * but we still want check_async_completion to cleanup
3658          */
3659         return true;
3660 }
3661
3662 static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu)
3663 {
3664         hva_t hva;
3665         struct kvm_arch_async_pf arch;
3666         int rc;
3667
3668         if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
3669                 return 0;
3670         if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) !=
3671             vcpu->arch.pfault_compare)
3672                 return 0;
3673         if (psw_extint_disabled(vcpu))
3674                 return 0;
3675         if (kvm_s390_vcpu_has_irq(vcpu, 0))
3676                 return 0;
3677         if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK))
3678                 return 0;
3679         if (!vcpu->arch.gmap->pfault_enabled)
3680                 return 0;
3681
3682         hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr));
3683         hva += current->thread.gmap_addr & ~PAGE_MASK;
3684         if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8))
3685                 return 0;
3686
3687         rc = kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch);
3688         return rc;
3689 }
3690
3691 static int vcpu_pre_run(struct kvm_vcpu *vcpu)
3692 {
3693         int rc, cpuflags;
3694
3695         /*
3696          * On s390 notifications for arriving pages will be delivered directly
3697          * to the guest but the house keeping for completed pfaults is
3698          * handled outside the worker.
3699          */
3700         kvm_check_async_pf_completion(vcpu);
3701
3702         vcpu->arch.sie_block->gg14 = vcpu->run->s.regs.gprs[14];
3703         vcpu->arch.sie_block->gg15 = vcpu->run->s.regs.gprs[15];
3704
3705         if (need_resched())
3706                 schedule();
3707
3708         if (test_cpu_flag(CIF_MCCK_PENDING))
3709                 s390_handle_mcck();
3710
3711         if (!kvm_is_ucontrol(vcpu->kvm)) {
3712                 rc = kvm_s390_deliver_pending_interrupts(vcpu);
3713                 if (rc)
3714                         return rc;
3715         }
3716
3717         rc = kvm_s390_handle_requests(vcpu);
3718         if (rc)
3719                 return rc;
3720
3721         if (guestdbg_enabled(vcpu)) {
3722                 kvm_s390_backup_guest_per_regs(vcpu);
3723                 kvm_s390_patch_guest_per_regs(vcpu);
3724         }
3725
3726         clear_bit(vcpu->vcpu_id, vcpu->kvm->arch.gisa_int.kicked_mask);
3727
3728         vcpu->arch.sie_block->icptcode = 0;
3729         cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags);
3730         VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags);
3731         trace_kvm_s390_sie_enter(vcpu, cpuflags);
3732
3733         return 0;
3734 }
3735
3736 static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu)
3737 {
3738         struct kvm_s390_pgm_info pgm_info = {
3739                 .code = PGM_ADDRESSING,
3740         };
3741         u8 opcode, ilen;
3742         int rc;
3743
3744         VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction");
3745         trace_kvm_s390_sie_fault(vcpu);
3746
3747         /*
3748          * We want to inject an addressing exception, which is defined as a
3749          * suppressing or terminating exception. However, since we came here
3750          * by a DAT access exception, the PSW still points to the faulting
3751          * instruction since DAT exceptions are nullifying. So we've got
3752          * to look up the current opcode to get the length of the instruction
3753          * to be able to forward the PSW.
3754          */
3755         rc = read_guest_instr(vcpu, vcpu->arch.sie_block->gpsw.addr, &opcode, 1);
3756         ilen = insn_length(opcode);
3757         if (rc < 0) {
3758                 return rc;
3759         } else if (rc) {
3760                 /* Instruction-Fetching Exceptions - we can't detect the ilen.
3761                  * Forward by arbitrary ilc, injection will take care of
3762                  * nullification if necessary.
3763                  */
3764                 pgm_info = vcpu->arch.pgm;
3765                 ilen = 4;
3766         }
3767         pgm_info.flags = ilen | KVM_S390_PGM_FLAGS_ILC_VALID;
3768         kvm_s390_forward_psw(vcpu, ilen);
3769         return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
3770 }
3771
3772 static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason)
3773 {
3774         struct mcck_volatile_info *mcck_info;
3775         struct sie_page *sie_page;
3776
3777         VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
3778                    vcpu->arch.sie_block->icptcode);
3779         trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);
3780
3781         if (guestdbg_enabled(vcpu))
3782                 kvm_s390_restore_guest_per_regs(vcpu);
3783
3784         vcpu->run->s.regs.gprs[14] = vcpu->arch.sie_block->gg14;
3785         vcpu->run->s.regs.gprs[15] = vcpu->arch.sie_block->gg15;
3786
3787         if (exit_reason == -EINTR) {
3788                 VCPU_EVENT(vcpu, 3, "%s", "machine check");
3789                 sie_page = container_of(vcpu->arch.sie_block,
3790                                         struct sie_page, sie_block);
3791                 mcck_info = &sie_page->mcck_info;
3792                 kvm_s390_reinject_machine_check(vcpu, mcck_info);
3793                 return 0;
3794         }
3795
3796         if (vcpu->arch.sie_block->icptcode > 0) {
3797                 int rc = kvm_handle_sie_intercept(vcpu);
3798
3799                 if (rc != -EOPNOTSUPP)
3800                         return rc;
3801                 vcpu->run->exit_reason = KVM_EXIT_S390_SIEIC;
3802                 vcpu->run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode;
3803                 vcpu->run->s390_sieic.ipa = vcpu->arch.sie_block->ipa;
3804                 vcpu->run->s390_sieic.ipb = vcpu->arch.sie_block->ipb;
3805                 return -EREMOTE;
3806         } else if (exit_reason != -EFAULT) {
3807                 vcpu->stat.exit_null++;
3808                 return 0;
3809         } else if (kvm_is_ucontrol(vcpu->kvm)) {
3810                 vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL;
3811                 vcpu->run->s390_ucontrol.trans_exc_code =
3812                                                 current->thread.gmap_addr;
3813                 vcpu->run->s390_ucontrol.pgm_code = 0x10;
3814                 return -EREMOTE;
3815         } else if (current->thread.gmap_pfault) {
3816                 trace_kvm_s390_major_guest_pfault(vcpu);
3817                 current->thread.gmap_pfault = 0;
3818                 if (kvm_arch_setup_async_pf(vcpu))
3819                         return 0;
3820                 return kvm_arch_fault_in_page(vcpu, current->thread.gmap_addr, 1);
3821         }
3822         return vcpu_post_run_fault_in_sie(vcpu);
3823 }
3824
3825 static int __vcpu_run(struct kvm_vcpu *vcpu)
3826 {
3827         int rc, exit_reason;
3828
3829         /*
3830          * We try to hold kvm->srcu during most of vcpu_run (except when run-
3831          * ning the guest), so that memslots (and other stuff) are protected
3832          */
3833         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
3834
3835         do {
3836                 rc = vcpu_pre_run(vcpu);
3837                 if (rc)
3838                         break;
3839
3840                 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
3841                 /*
3842                  * As PF_VCPU will be used in fault handler, between
3843                  * guest_enter and guest_exit should be no uaccess.
3844                  */
3845                 local_irq_disable();
3846                 guest_enter_irqoff();
3847                 __disable_cpu_timer_accounting(vcpu);
3848                 local_irq_enable();
3849                 exit_reason = sie64a(vcpu->arch.sie_block,
3850                                      vcpu->run->s.regs.gprs);
3851                 local_irq_disable();
3852                 __enable_cpu_timer_accounting(vcpu);
3853                 guest_exit_irqoff();
3854                 local_irq_enable();
3855                 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
3856
3857                 rc = vcpu_post_run(vcpu, exit_reason);
3858         } while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc);
3859
3860         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
3861         return rc;
3862 }
3863
3864 static void sync_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3865 {
3866         struct runtime_instr_cb *riccb;
3867         struct gs_cb *gscb;
3868
3869         riccb = (struct runtime_instr_cb *) &kvm_run->s.regs.riccb;
3870         gscb = (struct gs_cb *) &kvm_run->s.regs.gscb;
3871         vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
3872         vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
3873         if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX)
3874                 kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
3875         if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) {
3876                 memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128);
3877                 /* some control register changes require a tlb flush */
3878                 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
3879         }
3880         if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
3881                 kvm_s390_set_cpu_timer(vcpu, kvm_run->s.regs.cputm);
3882                 vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc;
3883                 vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr;
3884                 vcpu->arch.sie_block->pp = kvm_run->s.regs.pp;
3885                 vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea;
3886         }
3887         if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) {
3888                 vcpu->arch.pfault_token = kvm_run->s.regs.pft;
3889                 vcpu->arch.pfault_select = kvm_run->s.regs.pfs;
3890                 vcpu->arch.pfault_compare = kvm_run->s.regs.pfc;
3891                 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
3892                         kvm_clear_async_pf_completion_queue(vcpu);
3893         }
3894         /*
3895          * If userspace sets the riccb (e.g. after migration) to a valid state,
3896          * we should enable RI here instead of doing the lazy enablement.
3897          */
3898         if ((kvm_run->kvm_dirty_regs & KVM_SYNC_RICCB) &&
3899             test_kvm_facility(vcpu->kvm, 64) &&
3900             riccb->v &&
3901             !(vcpu->arch.sie_block->ecb3 & ECB3_RI)) {
3902                 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (sync_regs)");
3903                 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
3904         }
3905         /*
3906          * If userspace sets the gscb (e.g. after migration) to non-zero,
3907          * we should enable GS here instead of doing the lazy enablement.
3908          */
3909         if ((kvm_run->kvm_dirty_regs & KVM_SYNC_GSCB) &&
3910             test_kvm_facility(vcpu->kvm, 133) &&
3911             gscb->gssm &&
3912             !vcpu->arch.gs_enabled) {
3913                 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (sync_regs)");
3914                 vcpu->arch.sie_block->ecb |= ECB_GS;
3915                 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
3916                 vcpu->arch.gs_enabled = 1;
3917         }
3918         if ((kvm_run->kvm_dirty_regs & KVM_SYNC_BPBC) &&
3919             test_kvm_facility(vcpu->kvm, 82)) {
3920                 vcpu->arch.sie_block->fpf &= ~FPF_BPBC;
3921                 vcpu->arch.sie_block->fpf |= kvm_run->s.regs.bpbc ? FPF_BPBC : 0;
3922         }
3923         save_access_regs(vcpu->arch.host_acrs);
3924         restore_access_regs(vcpu->run->s.regs.acrs);
3925         /* save host (userspace) fprs/vrs */
3926         save_fpu_regs();
3927         vcpu->arch.host_fpregs.fpc = current->thread.fpu.fpc;
3928         vcpu->arch.host_fpregs.regs = current->thread.fpu.regs;
3929         if (MACHINE_HAS_VX)
3930                 current->thread.fpu.regs = vcpu->run->s.regs.vrs;
3931         else
3932                 current->thread.fpu.regs = vcpu->run->s.regs.fprs;
3933         current->thread.fpu.fpc = vcpu->run->s.regs.fpc;
3934         if (test_fp_ctl(current->thread.fpu.fpc))
3935                 /* User space provided an invalid FPC, let's clear it */
3936                 current->thread.fpu.fpc = 0;
3937         if (MACHINE_HAS_GS) {
3938                 preempt_disable();
3939                 __ctl_set_bit(2, 4);
3940                 if (current->thread.gs_cb) {
3941                         vcpu->arch.host_gscb = current->thread.gs_cb;
3942                         save_gs_cb(vcpu->arch.host_gscb);
3943                 }
3944                 if (vcpu->arch.gs_enabled) {
3945                         current->thread.gs_cb = (struct gs_cb *)
3946                                                 &vcpu->run->s.regs.gscb;
3947                         restore_gs_cb(current->thread.gs_cb);
3948                 }
3949                 preempt_enable();
3950         }
3951         /* SIE will load etoken directly from SDNX and therefore kvm_run */
3952
3953         kvm_run->kvm_dirty_regs = 0;
3954 }
3955
3956 static void store_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3957 {
3958         kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask;
3959         kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr;
3960         kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu);
3961         memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128);
3962         kvm_run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu);
3963         kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc;
3964         kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr;
3965         kvm_run->s.regs.pp = vcpu->arch.sie_block->pp;
3966         kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea;
3967         kvm_run->s.regs.pft = vcpu->arch.pfault_token;
3968         kvm_run->s.regs.pfs = vcpu->arch.pfault_select;
3969         kvm_run->s.regs.pfc = vcpu->arch.pfault_compare;
3970         kvm_run->s.regs.bpbc = (vcpu->arch.sie_block->fpf & FPF_BPBC) == FPF_BPBC;
3971         save_access_regs(vcpu->run->s.regs.acrs);
3972         restore_access_regs(vcpu->arch.host_acrs);
3973         /* Save guest register state */
3974         save_fpu_regs();
3975         vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
3976         /* Restore will be done lazily at return */
3977         current->thread.fpu.fpc = vcpu->arch.host_fpregs.fpc;
3978         current->thread.fpu.regs = vcpu->arch.host_fpregs.regs;
3979         if (MACHINE_HAS_GS) {
3980                 __ctl_set_bit(2, 4);
3981                 if (vcpu->arch.gs_enabled)
3982                         save_gs_cb(current->thread.gs_cb);
3983                 preempt_disable();
3984                 current->thread.gs_cb = vcpu->arch.host_gscb;
3985                 restore_gs_cb(vcpu->arch.host_gscb);
3986                 preempt_enable();
3987                 if (!vcpu->arch.host_gscb)
3988                         __ctl_clear_bit(2, 4);
3989                 vcpu->arch.host_gscb = NULL;
3990         }
3991         /* SIE will save etoken directly into SDNX and therefore kvm_run */
3992 }
3993
3994 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3995 {
3996         int rc;
3997
3998         if (kvm_run->immediate_exit)
3999                 return -EINTR;
4000
4001         vcpu_load(vcpu);
4002
4003         if (guestdbg_exit_pending(vcpu)) {
4004                 kvm_s390_prepare_debug_exit(vcpu);
4005                 rc = 0;
4006                 goto out;
4007         }
4008
4009         kvm_sigset_activate(vcpu);
4010
4011         if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) {
4012                 kvm_s390_vcpu_start(vcpu);
4013         } else if (is_vcpu_stopped(vcpu)) {
4014                 pr_err_ratelimited("can't run stopped vcpu %d\n",
4015                                    vcpu->vcpu_id);
4016                 rc = -EINVAL;
4017                 goto out;
4018         }
4019
4020         sync_regs(vcpu, kvm_run);
4021         enable_cpu_timer_accounting(vcpu);
4022
4023         might_fault();
4024         rc = __vcpu_run(vcpu);
4025
4026         if (signal_pending(current) && !rc) {
4027                 kvm_run->exit_reason = KVM_EXIT_INTR;
4028                 rc = -EINTR;
4029         }
4030
4031         if (guestdbg_exit_pending(vcpu) && !rc)  {
4032                 kvm_s390_prepare_debug_exit(vcpu);
4033                 rc = 0;
4034         }
4035
4036         if (rc == -EREMOTE) {
4037                 /* userspace support is needed, kvm_run has been prepared */
4038                 rc = 0;
4039         }
4040
4041         disable_cpu_timer_accounting(vcpu);
4042         store_regs(vcpu, kvm_run);
4043
4044         kvm_sigset_deactivate(vcpu);
4045
4046         vcpu->stat.exit_userspace++;
4047 out:
4048         vcpu_put(vcpu);
4049         return rc;
4050 }
4051
4052 /*
4053  * store status at address
4054  * we use have two special cases:
4055  * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit
4056  * KVM_S390_STORE_STATUS_PREFIXED: -> prefix
4057  */
4058 int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa)
4059 {
4060         unsigned char archmode = 1;
4061         freg_t fprs[NUM_FPRS];
4062         unsigned int px;
4063         u64 clkcomp, cputm;
4064         int rc;
4065
4066         px = kvm_s390_get_prefix(vcpu);
4067         if (gpa == KVM_S390_STORE_STATUS_NOADDR) {
4068                 if (write_guest_abs(vcpu, 163, &archmode, 1))
4069                         return -EFAULT;
4070                 gpa = 0;
4071         } else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) {
4072                 if (write_guest_real(vcpu, 163, &archmode, 1))
4073                         return -EFAULT;
4074                 gpa = px;
4075         } else
4076                 gpa -= __LC_FPREGS_SAVE_AREA;
4077
4078         /* manually convert vector registers if necessary */
4079         if (MACHINE_HAS_VX) {
4080                 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
4081                 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
4082                                      fprs, 128);
4083         } else {
4084                 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
4085                                      vcpu->run->s.regs.fprs, 128);
4086         }
4087         rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA,
4088                               vcpu->run->s.regs.gprs, 128);
4089         rc |= write_guest_abs(vcpu, gpa + __LC_PSW_SAVE_AREA,
4090                               &vcpu->arch.sie_block->gpsw, 16);
4091         rc |= write_guest_abs(vcpu, gpa + __LC_PREFIX_SAVE_AREA,
4092                               &px, 4);
4093         rc |= write_guest_abs(vcpu, gpa + __LC_FP_CREG_SAVE_AREA,
4094                               &vcpu->run->s.regs.fpc, 4);
4095         rc |= write_guest_abs(vcpu, gpa + __LC_TOD_PROGREG_SAVE_AREA,
4096                               &vcpu->arch.sie_block->todpr, 4);
4097         cputm = kvm_s390_get_cpu_timer(vcpu);
4098         rc |= write_guest_abs(vcpu, gpa + __LC_CPU_TIMER_SAVE_AREA,
4099                               &cputm, 8);
4100         clkcomp = vcpu->arch.sie_block->ckc >> 8;
4101         rc |= write_guest_abs(vcpu, gpa + __LC_CLOCK_COMP_SAVE_AREA,
4102                               &clkcomp, 8);
4103         rc |= write_guest_abs(vcpu, gpa + __LC_AREGS_SAVE_AREA,
4104                               &vcpu->run->s.regs.acrs, 64);
4105         rc |= write_guest_abs(vcpu, gpa + __LC_CREGS_SAVE_AREA,
4106                               &vcpu->arch.sie_block->gcr, 128);
4107         return rc ? -EFAULT : 0;
4108 }
4109
4110 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
4111 {
4112         /*
4113          * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy
4114          * switch in the run ioctl. Let's update our copies before we save
4115          * it into the save area
4116          */
4117         save_fpu_regs();
4118         vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
4119         save_access_regs(vcpu->run->s.regs.acrs);
4120
4121         return kvm_s390_store_status_unloaded(vcpu, addr);
4122 }
4123
4124 static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
4125 {
4126         kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu);
4127         kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu);
4128 }
4129
4130 static void __disable_ibs_on_all_vcpus(struct kvm *kvm)
4131 {
4132         unsigned int i;
4133         struct kvm_vcpu *vcpu;
4134
4135         kvm_for_each_vcpu(i, vcpu, kvm) {
4136                 __disable_ibs_on_vcpu(vcpu);
4137         }
4138 }
4139
4140 static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
4141 {
4142         if (!sclp.has_ibs)
4143                 return;
4144         kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu);
4145         kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu);
4146 }
4147
4148 void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu)
4149 {
4150         int i, online_vcpus, started_vcpus = 0;
4151
4152         if (!is_vcpu_stopped(vcpu))
4153                 return;
4154
4155         trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1);
4156         /* Only one cpu at a time may enter/leave the STOPPED state. */
4157         spin_lock(&vcpu->kvm->arch.start_stop_lock);
4158         online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
4159
4160         for (i = 0; i < online_vcpus; i++) {
4161                 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i]))
4162                         started_vcpus++;
4163         }
4164
4165         if (started_vcpus == 0) {
4166                 /* we're the only active VCPU -> speed it up */
4167                 __enable_ibs_on_vcpu(vcpu);
4168         } else if (started_vcpus == 1) {
4169                 /*
4170                  * As we are starting a second VCPU, we have to disable
4171                  * the IBS facility on all VCPUs to remove potentially
4172                  * oustanding ENABLE requests.
4173                  */
4174                 __disable_ibs_on_all_vcpus(vcpu->kvm);
4175         }
4176
4177         kvm_s390_clear_cpuflags(vcpu, CPUSTAT_STOPPED);
4178         /*
4179          * Another VCPU might have used IBS while we were offline.
4180          * Let's play safe and flush the VCPU at startup.
4181          */
4182         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
4183         spin_unlock(&vcpu->kvm->arch.start_stop_lock);
4184         return;
4185 }
4186
4187 void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu)
4188 {
4189         int i, online_vcpus, started_vcpus = 0;
4190         struct kvm_vcpu *started_vcpu = NULL;
4191
4192         if (is_vcpu_stopped(vcpu))
4193                 return;
4194
4195         trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0);
4196         /* Only one cpu at a time may enter/leave the STOPPED state. */
4197         spin_lock(&vcpu->kvm->arch.start_stop_lock);
4198         online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
4199
4200         /* SIGP STOP and SIGP STOP AND STORE STATUS has been fully processed */
4201         kvm_s390_clear_stop_irq(vcpu);
4202
4203         kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOPPED);
4204         __disable_ibs_on_vcpu(vcpu);
4205
4206         for (i = 0; i < online_vcpus; i++) {
4207                 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i])) {
4208                         started_vcpus++;
4209                         started_vcpu = vcpu->kvm->vcpus[i];
4210                 }
4211         }
4212
4213         if (started_vcpus == 1) {
4214                 /*
4215                  * As we only have one VCPU left, we want to enable the
4216                  * IBS facility for that VCPU to speed it up.
4217                  */
4218                 __enable_ibs_on_vcpu(started_vcpu);
4219         }
4220
4221         spin_unlock(&vcpu->kvm->arch.start_stop_lock);
4222         return;
4223 }
4224
4225 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
4226                                      struct kvm_enable_cap *cap)
4227 {
4228         int r;
4229
4230         if (cap->flags)
4231                 return -EINVAL;
4232
4233         switch (cap->cap) {
4234         case KVM_CAP_S390_CSS_SUPPORT:
4235                 if (!vcpu->kvm->arch.css_support) {
4236                         vcpu->kvm->arch.css_support = 1;
4237                         VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support");
4238                         trace_kvm_s390_enable_css(vcpu->kvm);
4239                 }
4240                 r = 0;
4241                 break;
4242         default:
4243                 r = -EINVAL;
4244                 break;
4245         }
4246         return r;
4247 }
4248
4249 static long kvm_s390_guest_mem_op(struct kvm_vcpu *vcpu,
4250                                   struct kvm_s390_mem_op *mop)
4251 {
4252         void __user *uaddr = (void __user *)mop->buf;
4253         void *tmpbuf = NULL;
4254         int r, srcu_idx;
4255         const u64 supported_flags = KVM_S390_MEMOP_F_INJECT_EXCEPTION
4256                                     | KVM_S390_MEMOP_F_CHECK_ONLY;
4257
4258         if (mop->flags & ~supported_flags)
4259                 return -EINVAL;
4260
4261         if (mop->size > MEM_OP_MAX_SIZE)
4262                 return -E2BIG;
4263
4264         if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) {
4265                 tmpbuf = vmalloc(mop->size);
4266                 if (!tmpbuf)
4267                         return -ENOMEM;
4268         }
4269
4270         srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
4271
4272         switch (mop->op) {
4273         case KVM_S390_MEMOP_LOGICAL_READ:
4274                 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
4275                         r = check_gva_range(vcpu, mop->gaddr, mop->ar,
4276                                             mop->size, GACC_FETCH);
4277                         break;
4278                 }
4279                 r = read_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size);
4280                 if (r == 0) {
4281                         if (copy_to_user(uaddr, tmpbuf, mop->size))
4282                                 r = -EFAULT;
4283                 }
4284                 break;
4285         case KVM_S390_MEMOP_LOGICAL_WRITE:
4286                 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
4287                         r = check_gva_range(vcpu, mop->gaddr, mop->ar,
4288                                             mop->size, GACC_STORE);
4289                         break;
4290                 }
4291                 if (copy_from_user(tmpbuf, uaddr, mop->size)) {
4292                         r = -EFAULT;
4293                         break;
4294                 }
4295                 r = write_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size);
4296                 break;
4297         default:
4298                 r = -EINVAL;
4299         }
4300
4301         srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
4302
4303         if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0)
4304                 kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
4305
4306         vfree(tmpbuf);
4307         return r;
4308 }
4309
4310 long kvm_arch_vcpu_async_ioctl(struct file *filp,
4311                                unsigned int ioctl, unsigned long arg)
4312 {
4313         struct kvm_vcpu *vcpu = filp->private_data;
4314         void __user *argp = (void __user *)arg;
4315
4316         switch (ioctl) {
4317         case KVM_S390_IRQ: {
4318                 struct kvm_s390_irq s390irq;
4319
4320                 if (copy_from_user(&s390irq, argp, sizeof(s390irq)))
4321                         return -EFAULT;
4322                 return kvm_s390_inject_vcpu(vcpu, &s390irq);
4323         }
4324         case KVM_S390_INTERRUPT: {
4325                 struct kvm_s390_interrupt s390int;
4326                 struct kvm_s390_irq s390irq;
4327
4328                 if (copy_from_user(&s390int, argp, sizeof(s390int)))
4329                         return -EFAULT;
4330                 if (s390int_to_s390irq(&s390int, &s390irq))
4331                         return -EINVAL;
4332                 return kvm_s390_inject_vcpu(vcpu, &s390irq);
4333         }
4334         }
4335         return -ENOIOCTLCMD;
4336 }
4337
4338 long kvm_arch_vcpu_ioctl(struct file *filp,
4339                          unsigned int ioctl, unsigned long arg)
4340 {
4341         struct kvm_vcpu *vcpu = filp->private_data;
4342         void __user *argp = (void __user *)arg;
4343         int idx;
4344         long r;
4345
4346         vcpu_load(vcpu);
4347
4348         switch (ioctl) {
4349         case KVM_S390_STORE_STATUS:
4350                 idx = srcu_read_lock(&vcpu->kvm->srcu);
4351                 r = kvm_s390_vcpu_store_status(vcpu, arg);
4352                 srcu_read_unlock(&vcpu->kvm->srcu, idx);
4353                 break;
4354         case KVM_S390_SET_INITIAL_PSW: {
4355                 psw_t psw;
4356
4357                 r = -EFAULT;
4358                 if (copy_from_user(&psw, argp, sizeof(psw)))
4359                         break;
4360                 r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
4361                 break;
4362         }
4363         case KVM_S390_INITIAL_RESET:
4364                 r = kvm_arch_vcpu_ioctl_initial_reset(vcpu);
4365                 break;
4366         case KVM_SET_ONE_REG:
4367         case KVM_GET_ONE_REG: {
4368                 struct kvm_one_reg reg;
4369                 r = -EFAULT;
4370                 if (copy_from_user(&reg, argp, sizeof(reg)))
4371                         break;
4372                 if (ioctl == KVM_SET_ONE_REG)
4373                         r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, &reg);
4374                 else
4375                         r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, &reg);
4376                 break;
4377         }
4378 #ifdef CONFIG_KVM_S390_UCONTROL
4379         case KVM_S390_UCAS_MAP: {
4380                 struct kvm_s390_ucas_mapping ucasmap;
4381
4382                 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
4383                         r = -EFAULT;
4384                         break;
4385                 }
4386
4387                 if (!kvm_is_ucontrol(vcpu->kvm)) {
4388                         r = -EINVAL;
4389                         break;
4390                 }
4391
4392                 r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr,
4393                                      ucasmap.vcpu_addr, ucasmap.length);
4394                 break;
4395         }
4396         case KVM_S390_UCAS_UNMAP: {
4397                 struct kvm_s390_ucas_mapping ucasmap;
4398
4399                 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
4400                         r = -EFAULT;
4401                         break;
4402                 }
4403
4404                 if (!kvm_is_ucontrol(vcpu->kvm)) {
4405                         r = -EINVAL;
4406                         break;
4407                 }
4408
4409                 r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr,
4410                         ucasmap.length);
4411                 break;
4412         }
4413 #endif
4414         case KVM_S390_VCPU_FAULT: {
4415                 r = gmap_fault(vcpu->arch.gmap, arg, 0);
4416                 break;
4417         }
4418         case KVM_ENABLE_CAP:
4419         {
4420                 struct kvm_enable_cap cap;
4421                 r = -EFAULT;
4422                 if (copy_from_user(&cap, argp, sizeof(cap)))
4423                         break;
4424                 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
4425                 break;
4426         }
4427         case KVM_S390_MEM_OP: {
4428                 struct kvm_s390_mem_op mem_op;
4429
4430                 if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0)
4431                         r = kvm_s390_guest_mem_op(vcpu, &mem_op);
4432                 else
4433                         r = -EFAULT;
4434                 break;
4435         }
4436         case KVM_S390_SET_IRQ_STATE: {
4437                 struct kvm_s390_irq_state irq_state;
4438
4439                 r = -EFAULT;
4440                 if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
4441                         break;
4442                 if (irq_state.len > VCPU_IRQS_MAX_BUF ||
4443                     irq_state.len == 0 ||
4444                     irq_state.len % sizeof(struct kvm_s390_irq) > 0) {
4445                         r = -EINVAL;
4446                         break;
4447                 }
4448                 /* do not use irq_state.flags, it will break old QEMUs */
4449                 r = kvm_s390_set_irq_state(vcpu,
4450                                            (void __user *) irq_state.buf,
4451                                            irq_state.len);
4452                 break;
4453         }
4454         case KVM_S390_GET_IRQ_STATE: {
4455                 struct kvm_s390_irq_state irq_state;
4456
4457                 r = -EFAULT;
4458                 if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
4459                         break;
4460                 if (irq_state.len == 0) {
4461                         r = -EINVAL;
4462                         break;
4463                 }
4464                 /* do not use irq_state.flags, it will break old QEMUs */
4465                 r = kvm_s390_get_irq_state(vcpu,
4466                                            (__u8 __user *)  irq_state.buf,
4467                                            irq_state.len);
4468                 break;
4469         }
4470         default:
4471                 r = -ENOTTY;
4472         }
4473
4474         vcpu_put(vcpu);
4475         return r;
4476 }
4477
4478 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
4479 {
4480 #ifdef CONFIG_KVM_S390_UCONTROL
4481         if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET)
4482                  && (kvm_is_ucontrol(vcpu->kvm))) {
4483                 vmf->page = virt_to_page(vcpu->arch.sie_block);
4484                 get_page(vmf->page);
4485                 return 0;
4486         }
4487 #endif
4488         return VM_FAULT_SIGBUS;
4489 }
4490
4491 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
4492                             unsigned long npages)
4493 {
4494         return 0;
4495 }
4496
4497 /* Section: memory related */
4498 int kvm_arch_prepare_memory_region(struct kvm *kvm,
4499                                    struct kvm_memory_slot *memslot,
4500                                    const struct kvm_userspace_memory_region *mem,
4501                                    enum kvm_mr_change change)
4502 {
4503         /* A few sanity checks. We can have memory slots which have to be
4504            located/ended at a segment boundary (1MB). The memory in userland is
4505            ok to be fragmented into various different vmas. It is okay to mmap()
4506            and munmap() stuff in this slot after doing this call at any time */
4507
4508         if (mem->userspace_addr & 0xffffful)
4509                 return -EINVAL;
4510
4511         if (mem->memory_size & 0xffffful)
4512                 return -EINVAL;
4513
4514         if (mem->guest_phys_addr + mem->memory_size > kvm->arch.mem_limit)
4515                 return -EINVAL;
4516
4517         return 0;
4518 }
4519
4520 void kvm_arch_commit_memory_region(struct kvm *kvm,
4521                                 const struct kvm_userspace_memory_region *mem,
4522                                 const struct kvm_memory_slot *old,
4523                                 const struct kvm_memory_slot *new,
4524                                 enum kvm_mr_change change)
4525 {
4526         int rc = 0;
4527
4528         switch (change) {
4529         case KVM_MR_DELETE:
4530                 rc = gmap_unmap_segment(kvm->arch.gmap, old->base_gfn * PAGE_SIZE,
4531                                         old->npages * PAGE_SIZE);
4532                 break;
4533         case KVM_MR_MOVE:
4534                 rc = gmap_unmap_segment(kvm->arch.gmap, old->base_gfn * PAGE_SIZE,
4535                                         old->npages * PAGE_SIZE);
4536                 if (rc)
4537                         break;
4538                 /* FALLTHROUGH */
4539         case KVM_MR_CREATE:
4540                 rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr,
4541                                       mem->guest_phys_addr, mem->memory_size);
4542                 break;
4543         case KVM_MR_FLAGS_ONLY:
4544                 break;
4545         default:
4546                 WARN(1, "Unknown KVM MR CHANGE: %d\n", change);
4547         }
4548         if (rc)
4549                 pr_warn("failed to commit memory region\n");
4550         return;
4551 }
4552
4553 static inline unsigned long nonhyp_mask(int i)
4554 {
4555         unsigned int nonhyp_fai = (sclp.hmfai << i * 2) >> 30;
4556
4557         return 0x0000ffffffffffffUL >> (nonhyp_fai << 4);
4558 }
4559
4560 void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu)
4561 {
4562         vcpu->valid_wakeup = false;
4563 }
4564
4565 static int __init kvm_s390_init(void)
4566 {
4567         int i;
4568
4569         if (!sclp.has_sief2) {
4570                 pr_info("SIE is not available\n");
4571                 return -ENODEV;
4572         }
4573
4574         if (nested && hpage) {
4575                 pr_info("A KVM host that supports nesting cannot back its KVM guests with huge pages\n");
4576                 return -EINVAL;
4577         }
4578
4579         for (i = 0; i < 16; i++)
4580                 kvm_s390_fac_base[i] |=
4581                         S390_lowcore.stfle_fac_list[i] & nonhyp_mask(i);
4582
4583         return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
4584 }
4585
4586 static void __exit kvm_s390_exit(void)
4587 {
4588         kvm_exit();
4589 }
4590
4591 module_init(kvm_s390_init);
4592 module_exit(kvm_s390_exit);
4593
4594 /*
4595  * Enable autoloading of the kvm module.
4596  * Note that we add the module alias here instead of virt/kvm/kvm_main.c
4597  * since x86 takes a different approach.
4598  */
4599 #include <linux/miscdevice.h>
4600 MODULE_ALIAS_MISCDEV(KVM_MINOR);
4601 MODULE_ALIAS("devname:kvm");