arch/x86/kvm/hyperv.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * KVM Microsoft Hyper-V emulation
   4  *
   5  * derived from arch/x86/kvm/x86.c
   6  *
   7  * Copyright (C) 2006 Qumranet, Inc.
   8  * Copyright (C) 2008 Qumranet, Inc.
   9  * Copyright IBM Corporation, 2008
  10  * Copyright 2010 Red Hat, Inc. and/or its affiliates.
  11  * Copyright (C) 2015 Andrey Smetanin <asmetanin@virtuozzo.com>
  12  *
  13  * Authors:
  14  *   Avi Kivity   <avi@qumranet.com>
  15  *   Yaniv Kamay  <yaniv@qumranet.com>
  16  *   Amit Shah    <amit.shah@qumranet.com>
  17  *   Ben-Ami Yassour <benami@il.ibm.com>
  18  *   Andrey Smetanin <asmetanin@virtuozzo.com>
  19  */
  20
  21 #include "x86.h"
  22 #include "lapic.h"
  23 #include "ioapic.h"
  24 #include "hyperv.h"
  25
  26 #include <linux/cpu.h>
  27 #include <linux/kvm_host.h>
  28 #include <linux/highmem.h>
  29 #include <linux/sched/cputime.h>
  30 #include <linux/eventfd.h>
  31
  32 #include <asm/apicdef.h>
  33 #include <trace/events/kvm.h>
  34
  35 #include "trace.h"
  36
  37 #define KVM_HV_MAX_SPARSE_VCPU_SET_BITS DIV_ROUND_UP(KVM_MAX_VCPUS, 64)
  38
  39 static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer,
  40                                 bool vcpu_kick);
  41
  42 static inline u64 synic_read_sint(struct kvm_vcpu_hv_synic *synic, int sint)
  43 {
  44         return atomic64_read(&synic->sint[sint]);
  45 }
  46
  47 static inline int synic_get_sint_vector(u64 sint_value)
  48 {
  49         if (sint_value & HV_SYNIC_SINT_MASKED)
  50                 return -1;
  51         return sint_value & HV_SYNIC_SINT_VECTOR_MASK;
  52 }
  53
  54 static bool synic_has_vector_connected(struct kvm_vcpu_hv_synic *synic,
  55                                       int vector)
  56 {
  57         int i;
  58
  59         for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
  60                 if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector)
  61                         return true;
  62         }
  63         return false;
  64 }
  65
  66 static bool synic_has_vector_auto_eoi(struct kvm_vcpu_hv_synic *synic,
  67                                      int vector)
  68 {
  69         int i;
  70         u64 sint_value;
  71
  72         for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
  73                 sint_value = synic_read_sint(synic, i);
  74                 if (synic_get_sint_vector(sint_value) == vector &&
  75                     sint_value & HV_SYNIC_SINT_AUTO_EOI)
  76                         return true;
  77         }
  78         return false;
  79 }
  80
  81 static void synic_update_vector(struct kvm_vcpu_hv_synic *synic,
  82                                 int vector)
  83 {
  84         if (vector < HV_SYNIC_FIRST_VALID_VECTOR)
  85                 return;
  86
  87         if (synic_has_vector_connected(synic, vector))
  88                 __set_bit(vector, synic->vec_bitmap);
  89         else
  90                 __clear_bit(vector, synic->vec_bitmap);
  91
  92         if (synic_has_vector_auto_eoi(synic, vector))
  93                 __set_bit(vector, synic->auto_eoi_bitmap);
  94         else
  95                 __clear_bit(vector, synic->auto_eoi_bitmap);
  96 }
  97
  98 static int synic_set_sint(struct kvm_vcpu_hv_synic *synic, int sint,
  99                           u64 data, bool host)
 100 {
 101         int vector, old_vector;
 102         bool masked;
 103
 104         vector = data & HV_SYNIC_SINT_VECTOR_MASK;
 105         masked = data & HV_SYNIC_SINT_MASKED;
 106
 107         /*
 108          * Valid vectors are 16-255, however, nested Hyper-V attempts to write
 109          * default '0x10000' value on boot and this should not #GP. We need to
 110          * allow zero-initing the register from host as well.
 111          */
 112         if (vector < HV_SYNIC_FIRST_VALID_VECTOR && !host && !masked)
 113                 return 1;
 114         /*
 115          * Guest may configure multiple SINTs to use the same vector, so
 116          * we maintain a bitmap of vectors handled by synic, and a
 117          * bitmap of vectors with auto-eoi behavior.  The bitmaps are
 118          * updated here, and atomically queried on fast paths.
 119          */
 120         old_vector = synic_read_sint(synic, sint) & HV_SYNIC_SINT_VECTOR_MASK;
 121
 122         atomic64_set(&synic->sint[sint], data);
 123
 124         synic_update_vector(synic, old_vector);
 125
 126         synic_update_vector(synic, vector);
 127
 128         /* Load SynIC vectors into EOI exit bitmap */
 129         kvm_make_request(KVM_REQ_SCAN_IOAPIC, synic_to_vcpu(synic));
 130         return 0;
 131 }
 132
 133 static struct kvm_vcpu *get_vcpu_by_vpidx(struct kvm *kvm, u32 vpidx)
 134 {
 135         struct kvm_vcpu *vcpu = NULL;
 136         int i;
 137
 138         if (vpidx >= KVM_MAX_VCPUS)
 139                 return NULL;
 140
 141         vcpu = kvm_get_vcpu(kvm, vpidx);
 142         if (vcpu && vcpu_to_hv_vcpu(vcpu)->vp_index == vpidx)
 143                 return vcpu;
 144         kvm_for_each_vcpu(i, vcpu, kvm)
 145                 if (vcpu_to_hv_vcpu(vcpu)->vp_index == vpidx)
 146                         return vcpu;
 147         return NULL;
 148 }
 149
 150 static struct kvm_vcpu_hv_synic *synic_get(struct kvm *kvm, u32 vpidx)
 151 {
 152         struct kvm_vcpu *vcpu;
 153         struct kvm_vcpu_hv_synic *synic;
 154
 155         vcpu = get_vcpu_by_vpidx(kvm, vpidx);
 156         if (!vcpu)
 157                 return NULL;
 158         synic = vcpu_to_synic(vcpu);
 159         return (synic->active) ? synic : NULL;
 160 }
 161
 162 static void kvm_hv_notify_acked_sint(struct kvm_vcpu *vcpu, u32 sint)
 163 {
 164         struct kvm *kvm = vcpu->kvm;
 165         struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
 166         struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
 167         struct kvm_vcpu_hv_stimer *stimer;
 168         int gsi, idx;
 169
 170         trace_kvm_hv_notify_acked_sint(vcpu->vcpu_id, sint);
 171
 172         /* Try to deliver pending Hyper-V SynIC timers messages */
 173         for (idx = 0; idx < ARRAY_SIZE(hv_vcpu->stimer); idx++) {
 174                 stimer = &hv_vcpu->stimer[idx];
 175                 if (stimer->msg_pending && stimer->config.enable &&
 176                     !stimer->config.direct_mode &&
 177                     stimer->config.sintx == sint)
 178                         stimer_mark_pending(stimer, false);
 179         }
 180
 181         idx = srcu_read_lock(&kvm->irq_srcu);
 182         gsi = atomic_read(&synic->sint_to_gsi[sint]);
 183         if (gsi != -1)
 184                 kvm_notify_acked_gsi(kvm, gsi);
 185         srcu_read_unlock(&kvm->irq_srcu, idx);
 186 }
 187
 188 static void synic_exit(struct kvm_vcpu_hv_synic *synic, u32 msr)
 189 {
 190         struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
 191         struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv;
 192
 193         hv_vcpu->exit.type = KVM_EXIT_HYPERV_SYNIC;
 194         hv_vcpu->exit.u.synic.msr = msr;
 195         hv_vcpu->exit.u.synic.control = synic->control;
 196         hv_vcpu->exit.u.synic.evt_page = synic->evt_page;
 197         hv_vcpu->exit.u.synic.msg_page = synic->msg_page;
 198
 199         kvm_make_request(KVM_REQ_HV_EXIT, vcpu);
 200 }
 201
 202 static int synic_set_msr(struct kvm_vcpu_hv_synic *synic,
 203                          u32 msr, u64 data, bool host)
 204 {
 205         struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
 206         int ret;
 207
 208         if (!synic->active && (!host || data))
 209                 return 1;
 210
 211         trace_kvm_hv_synic_set_msr(vcpu->vcpu_id, msr, data, host);
 212
 213         ret = 0;
 214         switch (msr) {
 215         case HV_X64_MSR_SCONTROL:
 216                 synic->control = data;
 217                 if (!host)
 218                         synic_exit(synic, msr);
 219                 break;
 220         case HV_X64_MSR_SVERSION:
 221                 if (!host) {
 222                         ret = 1;
 223                         break;
 224                 }
 225                 synic->version = data;
 226                 break;
 227         case HV_X64_MSR_SIEFP:
 228                 if ((data & HV_SYNIC_SIEFP_ENABLE) && !host &&
 229                     !synic->dont_zero_synic_pages)
 230                         if (kvm_clear_guest(vcpu->kvm,
 231                                             data & PAGE_MASK, PAGE_SIZE)) {
 232                                 ret = 1;
 233                                 break;
 234                         }
 235                 synic->evt_page = data;
 236                 if (!host)
 237                         synic_exit(synic, msr);
 238                 break;
 239         case HV_X64_MSR_SIMP:
 240                 if ((data & HV_SYNIC_SIMP_ENABLE) && !host &&
 241                     !synic->dont_zero_synic_pages)
 242                         if (kvm_clear_guest(vcpu->kvm,
 243                                             data & PAGE_MASK, PAGE_SIZE)) {
 244                                 ret = 1;
 245                                 break;
 246                         }
 247                 synic->msg_page = data;
 248                 if (!host)
 249                         synic_exit(synic, msr);
 250                 break;
 251         case HV_X64_MSR_EOM: {
 252                 int i;
 253
 254                 if (!synic->active)
 255                         break;
 256
 257                 for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
 258                         kvm_hv_notify_acked_sint(vcpu, i);
 259                 break;
 260         }
 261         case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
 262                 ret = synic_set_sint(synic, msr - HV_X64_MSR_SINT0, data, host);
 263                 break;
 264         default:
 265                 ret = 1;
 266                 break;
 267         }
 268         return ret;
 269 }
 270
 271 static int synic_get_msr(struct kvm_vcpu_hv_synic *synic, u32 msr, u64 *pdata,
 272                          bool host)
 273 {
 274         int ret;
 275
 276         if (!synic->active && !host)
 277                 return 1;
 278
 279         ret = 0;
 280         switch (msr) {
 281         case HV_X64_MSR_SCONTROL:
 282                 *pdata = synic->control;
 283                 break;
 284         case HV_X64_MSR_SVERSION:
 285                 *pdata = synic->version;
 286                 break;
 287         case HV_X64_MSR_SIEFP:
 288                 *pdata = synic->evt_page;
 289                 break;
 290         case HV_X64_MSR_SIMP:
 291                 *pdata = synic->msg_page;
 292                 break;
 293         case HV_X64_MSR_EOM:
 294                 *pdata = 0;
 295                 break;
 296         case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
 297                 *pdata = atomic64_read(&synic->sint[msr - HV_X64_MSR_SINT0]);
 298                 break;
 299         default:
 300                 ret = 1;
 301                 break;
 302         }
 303         return ret;
 304 }
 305
 306 static int synic_set_irq(struct kvm_vcpu_hv_synic *synic, u32 sint)
 307 {
 308         struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
 309         struct kvm_lapic_irq irq;
 310         int ret, vector;
 311
 312         if (KVM_BUG_ON(!lapic_in_kernel(vcpu), vcpu->kvm))
 313                 return -EINVAL;
 314
 315         if (sint >= ARRAY_SIZE(synic->sint))
 316                 return -EINVAL;
 317
 318         vector = synic_get_sint_vector(synic_read_sint(synic, sint));
 319         if (vector < 0)
 320                 return -ENOENT;
 321
 322         memset(&irq, 0, sizeof(irq));
 323         irq.shorthand = APIC_DEST_SELF;
 324         irq.dest_mode = APIC_DEST_PHYSICAL;
 325         irq.delivery_mode = APIC_DM_FIXED;
 326         irq.vector = vector;
 327         irq.level = 1;
 328
 329         ret = kvm_irq_delivery_to_apic(vcpu->kvm, vcpu->arch.apic, &irq, NULL);
 330         trace_kvm_hv_synic_set_irq(vcpu->vcpu_id, sint, irq.vector, ret);
 331         return ret;
 332 }
 333
 334 int kvm_hv_synic_set_irq(struct kvm *kvm, u32 vpidx, u32 sint)
 335 {
 336         struct kvm_vcpu_hv_synic *synic;
 337
 338         synic = synic_get(kvm, vpidx);
 339         if (!synic)
 340                 return -EINVAL;
 341
 342         return synic_set_irq(synic, sint);
 343 }
 344
 345 void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector)
 346 {
 347         struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
 348         int i;
 349
 350         trace_kvm_hv_synic_send_eoi(vcpu->vcpu_id, vector);
 351
 352         for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
 353                 if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector)
 354                         kvm_hv_notify_acked_sint(vcpu, i);
 355 }
 356
 357 static int kvm_hv_set_sint_gsi(struct kvm *kvm, u32 vpidx, u32 sint, int gsi)
 358 {
 359         struct kvm_vcpu_hv_synic *synic;
 360
 361         synic = synic_get(kvm, vpidx);
 362         if (!synic)
 363                 return -EINVAL;
 364
 365         if (sint >= ARRAY_SIZE(synic->sint_to_gsi))
 366                 return -EINVAL;
 367
 368         atomic_set(&synic->sint_to_gsi[sint], gsi);
 369         return 0;
 370 }
 371
 372 void kvm_hv_irq_routing_update(struct kvm *kvm)
 373 {
 374         struct kvm_irq_routing_table *irq_rt;
 375         struct kvm_kernel_irq_routing_entry *e;
 376         u32 gsi;
 377
 378         irq_rt = srcu_dereference_check(kvm->irq_routing, &kvm->irq_srcu,
 379                                         lockdep_is_held(&kvm->irq_lock));
 380
 381         for (gsi = 0; gsi < irq_rt->nr_rt_entries; gsi++) {
 382                 hlist_for_each_entry(e, &irq_rt->map[gsi], link) {
 383                         if (e->type == KVM_IRQ_ROUTING_HV_SINT)
 384                                 kvm_hv_set_sint_gsi(kvm, e->hv_sint.vcpu,
 385                                                     e->hv_sint.sint, gsi);
 386                 }
 387         }
 388 }
 389
 390 static void synic_init(struct kvm_vcpu_hv_synic *synic)
 391 {
 392         int i;
 393
 394         memset(synic, 0, sizeof(*synic));
 395         synic->version = HV_SYNIC_VERSION_1;
 396         for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
 397                 atomic64_set(&synic->sint[i], HV_SYNIC_SINT_MASKED);
 398                 atomic_set(&synic->sint_to_gsi[i], -1);
 399         }
 400 }
 401
 402 static u64 get_time_ref_counter(struct kvm *kvm)
 403 {
 404         struct kvm_hv *hv = &kvm->arch.hyperv;
 405         struct kvm_vcpu *vcpu;
 406         u64 tsc;
 407
 408         /*
 409          * The guest has not set up the TSC page or the clock isn't
 410          * stable, fall back to get_kvmclock_ns.
 411          */
 412         if (!hv->tsc_ref.tsc_sequence)
 413                 return div_u64(get_kvmclock_ns(kvm), 100);
 414
 415         vcpu = kvm_get_vcpu(kvm, 0);
 416         tsc = kvm_read_l1_tsc(vcpu, rdtsc());
 417         return mul_u64_u64_shr(tsc, hv->tsc_ref.tsc_scale, 64)
 418                 + hv->tsc_ref.tsc_offset;
 419 }
 420
 421 static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer,
 422                                 bool vcpu_kick)
 423 {
 424         struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
 425
 426         set_bit(stimer->index,
 427                 vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap);
 428         kvm_make_request(KVM_REQ_HV_STIMER, vcpu);
 429         if (vcpu_kick)
 430                 kvm_vcpu_kick(vcpu);
 431 }
 432
 433 static void stimer_cleanup(struct kvm_vcpu_hv_stimer *stimer)
 434 {
 435         struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
 436
 437         trace_kvm_hv_stimer_cleanup(stimer_to_vcpu(stimer)->vcpu_id,
 438                                     stimer->index);
 439
 440         hrtimer_cancel(&stimer->timer);
 441         clear_bit(stimer->index,
 442                   vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap);
 443         stimer->msg_pending = false;
 444         stimer->exp_time = 0;
 445 }
 446
 447 static enum hrtimer_restart stimer_timer_callback(struct hrtimer *timer)
 448 {
 449         struct kvm_vcpu_hv_stimer *stimer;
 450
 451         stimer = container_of(timer, struct kvm_vcpu_hv_stimer, timer);
 452         trace_kvm_hv_stimer_callback(stimer_to_vcpu(stimer)->vcpu_id,
 453                                      stimer->index);
 454         stimer_mark_pending(stimer, true);
 455
 456         return HRTIMER_NORESTART;
 457 }
 458
 459 /*
 460  * stimer_start() assumptions:
 461  * a) stimer->count is not equal to 0
 462  * b) stimer->config has HV_STIMER_ENABLE flag
 463  */
 464 static int stimer_start(struct kvm_vcpu_hv_stimer *stimer)
 465 {
 466         u64 time_now;
 467         ktime_t ktime_now;
 468
 469         time_now = get_time_ref_counter(stimer_to_vcpu(stimer)->kvm);
 470         ktime_now = ktime_get();
 471
 472         if (stimer->config.periodic) {
 473                 if (stimer->exp_time) {
 474                         if (time_now >= stimer->exp_time) {
 475                                 u64 remainder;
 476
 477                                 div64_u64_rem(time_now - stimer->exp_time,
 478                                               stimer->count, &remainder);
 479                                 stimer->exp_time =
 480                                         time_now + (stimer->count - remainder);
 481                         }
 482                 } else
 483                         stimer->exp_time = time_now + stimer->count;
 484
 485                 trace_kvm_hv_stimer_start_periodic(
 486                                         stimer_to_vcpu(stimer)->vcpu_id,
 487                                         stimer->index,
 488                                         time_now, stimer->exp_time);
 489
 490                 hrtimer_start(&stimer->timer,
 491                               ktime_add_ns(ktime_now,
 492                                            100 * (stimer->exp_time - time_now)),
 493                               HRTIMER_MODE_ABS);
 494                 return 0;
 495         }
 496         stimer->exp_time = stimer->count;
 497         if (time_now >= stimer->count) {
 498                 /*
 499                  * Expire timer according to Hypervisor Top-Level Functional
 500                  * specification v4(15.3.1):
 501                  * "If a one shot is enabled and the specified count is in
 502                  * the past, it will expire immediately."
 503                  */
 504                 stimer_mark_pending(stimer, false);
 505                 return 0;
 506         }
 507
 508         trace_kvm_hv_stimer_start_one_shot(stimer_to_vcpu(stimer)->vcpu_id,
 509                                            stimer->index,
 510                                            time_now, stimer->count);
 511
 512         hrtimer_start(&stimer->timer,
 513                       ktime_add_ns(ktime_now, 100 * (stimer->count - time_now)),
 514                       HRTIMER_MODE_ABS);
 515         return 0;
 516 }
 517
 518 static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config,
 519                              bool host)
 520 {
 521         union hv_stimer_config new_config = {.as_uint64 = config},
 522                 old_config = {.as_uint64 = stimer->config.as_uint64};
 523         struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
 524         struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
 525
 526         if (!synic->active && (!host || config))
 527                 return 1;
 528
 529         trace_kvm_hv_stimer_set_config(stimer_to_vcpu(stimer)->vcpu_id,
 530                                        stimer->index, config, host);
 531
 532         stimer_cleanup(stimer);
 533         if (old_config.enable &&
 534             !new_config.direct_mode && new_config.sintx == 0)
 535                 new_config.enable = 0;
 536         stimer->config.as_uint64 = new_config.as_uint64;
 537
 538         if (stimer->config.enable)
 539                 stimer_mark_pending(stimer, false);
 540
 541         return 0;
 542 }
 543
 544 static int stimer_set_count(struct kvm_vcpu_hv_stimer *stimer, u64 count,
 545                             bool host)
 546 {
 547         struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
 548         struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
 549
 550         if (!synic->active && (!host || count))
 551                 return 1;
 552
 553         trace_kvm_hv_stimer_set_count(stimer_to_vcpu(stimer)->vcpu_id,
 554                                       stimer->index, count, host);
 555
 556         stimer_cleanup(stimer);
 557         stimer->count = count;
 558         if (!host) {
 559                 if (stimer->count == 0)
 560                         stimer->config.enable = 0;
 561                 else if (stimer->config.auto_enable)
 562                         stimer->config.enable = 1;
 563         }
 564
 565         if (stimer->config.enable)
 566                 stimer_mark_pending(stimer, false);
 567
 568         return 0;
 569 }
 570
 571 static int stimer_get_config(struct kvm_vcpu_hv_stimer *stimer, u64 *pconfig)
 572 {
 573         *pconfig = stimer->config.as_uint64;
 574         return 0;
 575 }
 576
 577 static int stimer_get_count(struct kvm_vcpu_hv_stimer *stimer, u64 *pcount)
 578 {
 579         *pcount = stimer->count;
 580         return 0;
 581 }
 582
 583 static int synic_deliver_msg(struct kvm_vcpu_hv_synic *synic, u32 sint,
 584                              struct hv_message *src_msg, bool no_retry)
 585 {
 586         struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
 587         int msg_off = offsetof(struct hv_message_page, sint_message[sint]);
 588         gfn_t msg_page_gfn;
 589         struct hv_message_header hv_hdr;
 590         int r;
 591
 592         if (!(synic->msg_page & HV_SYNIC_SIMP_ENABLE))
 593                 return -ENOENT;
 594
 595         msg_page_gfn = synic->msg_page >> PAGE_SHIFT;
 596
 597         /*
 598          * Strictly following the spec-mandated ordering would assume setting
 599          * .msg_pending before checking .message_type.  However, this function
 600          * is only called in vcpu context so the entire update is atomic from
 601          * guest POV and thus the exact order here doesn't matter.
 602          */
 603         r = kvm_vcpu_read_guest_page(vcpu, msg_page_gfn, &hv_hdr.message_type,
 604                                      msg_off + offsetof(struct hv_message,
 605                                                         header.message_type),
 606                                      sizeof(hv_hdr.message_type));
 607         if (r < 0)
 608                 return r;
 609
 610         if (hv_hdr.message_type != HVMSG_NONE) {
 611                 if (no_retry)
 612                         return 0;
 613
 614                 hv_hdr.message_flags.msg_pending = 1;
 615                 r = kvm_vcpu_write_guest_page(vcpu, msg_page_gfn,
 616                                               &hv_hdr.message_flags,
 617                                               msg_off +
 618                                               offsetof(struct hv_message,
 619                                                        header.message_flags),
 620                                               sizeof(hv_hdr.message_flags));
 621                 if (r < 0)
 622                         return r;
 623                 return -EAGAIN;
 624         }
 625
 626         r = kvm_vcpu_write_guest_page(vcpu, msg_page_gfn, src_msg, msg_off,
 627                                       sizeof(src_msg->header) +
 628                                       src_msg->header.payload_size);
 629         if (r < 0)
 630                 return r;
 631
 632         r = synic_set_irq(synic, sint);
 633         if (r < 0)
 634                 return r;
 635         if (r == 0)
 636                 return -EFAULT;
 637         return 0;
 638 }
 639
 640 static int stimer_send_msg(struct kvm_vcpu_hv_stimer *stimer)
 641 {
 642         struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
 643         struct hv_message *msg = &stimer->msg;
 644         struct hv_timer_message_payload *payload =
 645                         (struct hv_timer_message_payload *)&msg->u.payload;
 646
 647         /*
 648          * To avoid piling up periodic ticks, don't retry message
 649          * delivery for them (within "lazy" lost ticks policy).
 650          */
 651         bool no_retry = stimer->config.periodic;
 652
 653         payload->expiration_time = stimer->exp_time;
 654         payload->delivery_time = get_time_ref_counter(vcpu->kvm);
 655         return synic_deliver_msg(vcpu_to_synic(vcpu),
 656                                  stimer->config.sintx, msg,
 657                                  no_retry);
 658 }
 659
 660 static int stimer_notify_direct(struct kvm_vcpu_hv_stimer *stimer)
 661 {
 662         struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
 663         struct kvm_lapic_irq irq = {
 664                 .delivery_mode = APIC_DM_FIXED,
 665                 .vector = stimer->config.apic_vector
 666         };
 667
 668         if (lapic_in_kernel(vcpu))
 669                 return !kvm_apic_set_irq(vcpu, &irq, NULL);
 670         return 0;
 671 }
 672
 673 static void stimer_expiration(struct kvm_vcpu_hv_stimer *stimer)
 674 {
 675         int r, direct = stimer->config.direct_mode;
 676
 677         stimer->msg_pending = true;
 678         if (!direct)
 679                 r = stimer_send_msg(stimer);
 680         else
 681                 r = stimer_notify_direct(stimer);
 682         trace_kvm_hv_stimer_expiration(stimer_to_vcpu(stimer)->vcpu_id,
 683                                        stimer->index, direct, r);
 684         if (!r) {
 685                 stimer->msg_pending = false;
 686                 if (!(stimer->config.periodic))
 687                         stimer->config.enable = 0;
 688         }
 689 }
 690
 691 void kvm_hv_process_stimers(struct kvm_vcpu *vcpu)
 692 {
 693         struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
 694         struct kvm_vcpu_hv_stimer *stimer;
 695         u64 time_now, exp_time;
 696         int i;
 697
 698         for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
 699                 if (test_and_clear_bit(i, hv_vcpu->stimer_pending_bitmap)) {
 700                         stimer = &hv_vcpu->stimer[i];
 701                         if (stimer->config.enable) {
 702                                 exp_time = stimer->exp_time;
 703
 704                                 if (exp_time) {
 705                                         time_now =
 706                                                 get_time_ref_counter(vcpu->kvm);
 707                                         if (time_now >= exp_time)
 708                                                 stimer_expiration(stimer);
 709                                 }
 710
 711                                 if ((stimer->config.enable) &&
 712                                     stimer->count) {
 713                                         if (!stimer->msg_pending)
 714                                                 stimer_start(stimer);
 715                                 } else
 716                                         stimer_cleanup(stimer);
 717                         }
 718                 }
 719 }
 720
 721 void kvm_hv_vcpu_uninit(struct kvm_vcpu *vcpu)
 722 {
 723         struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
 724         int i;
 725
 726         for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
 727                 stimer_cleanup(&hv_vcpu->stimer[i]);
 728 }
 729
 730 bool kvm_hv_assist_page_enabled(struct kvm_vcpu *vcpu)
 731 {
 732         if (!(vcpu->arch.hyperv.hv_vapic & HV_X64_MSR_VP_ASSIST_PAGE_ENABLE))
 733                 return false;
 734         return vcpu->arch.pv_eoi.msr_val & KVM_MSR_ENABLED;
 735 }
 736 EXPORT_SYMBOL_GPL(kvm_hv_assist_page_enabled);
 737
 738 bool kvm_hv_get_assist_page(struct kvm_vcpu *vcpu,
 739                             struct hv_vp_assist_page *assist_page)
 740 {
 741         if (!kvm_hv_assist_page_enabled(vcpu))
 742                 return false;
 743         return !kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data,
 744                                       assist_page, sizeof(*assist_page));
 745 }
 746 EXPORT_SYMBOL_GPL(kvm_hv_get_assist_page);
 747
 748 static void stimer_prepare_msg(struct kvm_vcpu_hv_stimer *stimer)
 749 {
 750         struct hv_message *msg = &stimer->msg;
 751         struct hv_timer_message_payload *payload =
 752                         (struct hv_timer_message_payload *)&msg->u.payload;
 753
 754         memset(&msg->header, 0, sizeof(msg->header));
 755         msg->header.message_type = HVMSG_TIMER_EXPIRED;
 756         msg->header.payload_size = sizeof(*payload);
 757
 758         payload->timer_index = stimer->index;
 759         payload->expiration_time = 0;
 760         payload->delivery_time = 0;
 761 }
 762
 763 static void stimer_init(struct kvm_vcpu_hv_stimer *stimer, int timer_index)
 764 {
 765         memset(stimer, 0, sizeof(*stimer));
 766         stimer->index = timer_index;
 767         hrtimer_init(&stimer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
 768         stimer->timer.function = stimer_timer_callback;
 769         stimer_prepare_msg(stimer);
 770 }
 771
 772 void kvm_hv_vcpu_init(struct kvm_vcpu *vcpu)
 773 {
 774         struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
 775         int i;
 776
 777         synic_init(&hv_vcpu->synic);
 778
 779         bitmap_zero(hv_vcpu->stimer_pending_bitmap, HV_SYNIC_STIMER_COUNT);
 780         for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
 781                 stimer_init(&hv_vcpu->stimer[i], i);
 782 }
 783
 784 void kvm_hv_vcpu_postcreate(struct kvm_vcpu *vcpu)
 785 {
 786         struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
 787
 788         hv_vcpu->vp_index = kvm_vcpu_get_idx(vcpu);
 789 }
 790
 791 int kvm_hv_activate_synic(struct kvm_vcpu *vcpu, bool dont_zero_synic_pages)
 792 {
 793         struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
 794
 795         /*
 796          * Hyper-V SynIC auto EOI SINT's are
 797          * not compatible with APICV, so deactivate APICV
 798          */
 799         kvm_vcpu_deactivate_apicv(vcpu);
 800         synic->active = true;
 801         synic->dont_zero_synic_pages = dont_zero_synic_pages;
 802         return 0;
 803 }
 804
 805 static bool kvm_hv_msr_partition_wide(u32 msr)
 806 {
 807         bool r = false;
 808
 809         switch (msr) {
 810         case HV_X64_MSR_GUEST_OS_ID:
 811         case HV_X64_MSR_HYPERCALL:
 812         case HV_X64_MSR_REFERENCE_TSC:
 813         case HV_X64_MSR_TIME_REF_COUNT:
 814         case HV_X64_MSR_CRASH_CTL:
 815         case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
 816         case HV_X64_MSR_RESET:
 817         case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
 818         case HV_X64_MSR_TSC_EMULATION_CONTROL:
 819         case HV_X64_MSR_TSC_EMULATION_STATUS:
 820                 r = true;
 821                 break;
 822         }
 823
 824         return r;
 825 }
 826
 827 static int kvm_hv_msr_get_crash_data(struct kvm_vcpu *vcpu,
 828                                      u32 index, u64 *pdata)
 829 {
 830         struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
 831         size_t size = ARRAY_SIZE(hv->hv_crash_param);
 832
 833         if (WARN_ON_ONCE(index >= size))
 834                 return -EINVAL;
 835
 836         *pdata = hv->hv_crash_param[array_index_nospec(index, size)];
 837         return 0;
 838 }
 839
 840 static int kvm_hv_msr_get_crash_ctl(struct kvm_vcpu *vcpu, u64 *pdata)
 841 {
 842         struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
 843
 844         *pdata = hv->hv_crash_ctl;
 845         return 0;
 846 }
 847
 848 static int kvm_hv_msr_set_crash_ctl(struct kvm_vcpu *vcpu, u64 data, bool host)
 849 {
 850         struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
 851
 852         if (host)
 853                 hv->hv_crash_ctl = data & HV_CRASH_CTL_CRASH_NOTIFY;
 854
 855         if (!host && (data & HV_CRASH_CTL_CRASH_NOTIFY)) {
 856
 857                 vcpu_debug(vcpu, "hv crash (0x%llx 0x%llx 0x%llx 0x%llx 0x%llx)\n",
 858                           hv->hv_crash_param[0],
 859                           hv->hv_crash_param[1],
 860                           hv->hv_crash_param[2],
 861                           hv->hv_crash_param[3],
 862                           hv->hv_crash_param[4]);
 863
 864                 /* Send notification about crash to user space */
 865                 kvm_make_request(KVM_REQ_HV_CRASH, vcpu);
 866         }
 867
 868         return 0;
 869 }
 870
 871 static int kvm_hv_msr_set_crash_data(struct kvm_vcpu *vcpu,
 872                                      u32 index, u64 data)
 873 {
 874         struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
 875         size_t size = ARRAY_SIZE(hv->hv_crash_param);
 876
 877         if (WARN_ON_ONCE(index >= size))
 878                 return -EINVAL;
 879
 880         hv->hv_crash_param[array_index_nospec(index, size)] = data;
 881         return 0;
 882 }
 883
 884 /*
 885  * The kvmclock and Hyper-V TSC page use similar formulas, and converting
 886  * between them is possible:
 887  *
 888  * kvmclock formula:
 889  *    nsec = (ticks - tsc_timestamp) * tsc_to_system_mul * 2^(tsc_shift-32)
 890  *           + system_time
 891  *
 892  * Hyper-V formula:
 893  *    nsec/100 = ticks * scale / 2^64 + offset
 894  *
 895  * When tsc_timestamp = system_time = 0, offset is zero in the Hyper-V formula.
 896  * By dividing the kvmclock formula by 100 and equating what's left we get:
 897  *    ticks * scale / 2^64 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100
 898  *            scale / 2^64 =         tsc_to_system_mul * 2^(tsc_shift-32) / 100
 899  *            scale        =         tsc_to_system_mul * 2^(32+tsc_shift) / 100
 900  *
 901  * Now expand the kvmclock formula and divide by 100:
 902  *    nsec = ticks * tsc_to_system_mul * 2^(tsc_shift-32)
 903  *           - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32)
 904  *           + system_time
 905  *    nsec/100 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100
 906  *               - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32) / 100
 907  *               + system_time / 100
 908  *
 909  * Replace tsc_to_system_mul * 2^(tsc_shift-32) / 100 by scale / 2^64:
 910  *    nsec/100 = ticks * scale / 2^64
 911  *               - tsc_timestamp * scale / 2^64
 912  *               + system_time / 100
 913  *
 914  * Equate with the Hyper-V formula so that ticks * scale / 2^64 cancels out:
 915  *    offset = system_time / 100 - tsc_timestamp * scale / 2^64
 916  *
 917  * These two equivalencies are implemented in this function.
 918  */
 919 static bool compute_tsc_page_parameters(struct pvclock_vcpu_time_info *hv_clock,
 920                                         HV_REFERENCE_TSC_PAGE *tsc_ref)
 921 {
 922         u64 max_mul;
 923
 924         if (!(hv_clock->flags & PVCLOCK_TSC_STABLE_BIT))
 925                 return false;
 926
 927         /*
 928          * check if scale would overflow, if so we use the time ref counter
 929          *    tsc_to_system_mul * 2^(tsc_shift+32) / 100 >= 2^64
 930          *    tsc_to_system_mul / 100 >= 2^(32-tsc_shift)
 931          *    tsc_to_system_mul >= 100 * 2^(32-tsc_shift)
 932          */
 933         max_mul = 100ull << (32 - hv_clock->tsc_shift);
 934         if (hv_clock->tsc_to_system_mul >= max_mul)
 935                 return false;
 936
 937         /*
 938          * Otherwise compute the scale and offset according to the formulas
 939          * derived above.
 940          */
 941         tsc_ref->tsc_scale =
 942                 mul_u64_u32_div(1ULL << (32 + hv_clock->tsc_shift),
 943                                 hv_clock->tsc_to_system_mul,
 944                                 100);
 945
 946         tsc_ref->tsc_offset = hv_clock->system_time;
 947         do_div(tsc_ref->tsc_offset, 100);
 948         tsc_ref->tsc_offset -=
 949                 mul_u64_u64_shr(hv_clock->tsc_timestamp, tsc_ref->tsc_scale, 64);
 950         return true;
 951 }
 952
 953 void kvm_hv_setup_tsc_page(struct kvm *kvm,
 954                            struct pvclock_vcpu_time_info *hv_clock)
 955 {
 956         struct kvm_hv *hv = &kvm->arch.hyperv;
 957         u32 tsc_seq;
 958         u64 gfn;
 959
 960         BUILD_BUG_ON(sizeof(tsc_seq) != sizeof(hv->tsc_ref.tsc_sequence));
 961         BUILD_BUG_ON(offsetof(HV_REFERENCE_TSC_PAGE, tsc_sequence) != 0);
 962
 963         if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE))
 964                 return;
 965
 966         mutex_lock(&kvm->arch.hyperv.hv_lock);
 967         if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE))
 968                 goto out_unlock;
 969
 970         gfn = hv->hv_tsc_page >> HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT;
 971         /*
 972          * Because the TSC parameters only vary when there is a
 973          * change in the master clock, do not bother with caching.
 974          */
 975         if (unlikely(kvm_read_guest(kvm, gfn_to_gpa(gfn),
 976                                     &tsc_seq, sizeof(tsc_seq))))
 977                 goto out_unlock;
 978
 979         /*
 980          * While we're computing and writing the parameters, force the
 981          * guest to use the time reference count MSR.
 982          */
 983         hv->tsc_ref.tsc_sequence = 0;
 984         if (kvm_write_guest(kvm, gfn_to_gpa(gfn),
 985                             &hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence)))
 986                 goto out_unlock;
 987
 988         if (!compute_tsc_page_parameters(hv_clock, &hv->tsc_ref))
 989                 goto out_unlock;
 990
 991         /* Ensure sequence is zero before writing the rest of the struct.  */
 992         smp_wmb();
 993         if (kvm_write_guest(kvm, gfn_to_gpa(gfn), &hv->tsc_ref, sizeof(hv->tsc_ref)))
 994                 goto out_unlock;
 995
 996         /*
 997          * Now switch to the TSC page mechanism by writing the sequence.
 998          */
 999         tsc_seq++;
1000         if (tsc_seq == 0xFFFFFFFF || tsc_seq == 0)
1001                 tsc_seq = 1;
1002
1003         /* Write the struct entirely before the non-zero sequence.  */
1004         smp_wmb();
1005
1006         hv->tsc_ref.tsc_sequence = tsc_seq;
1007         kvm_write_guest(kvm, gfn_to_gpa(gfn),
1008                         &hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence));
1009 out_unlock:
1010         mutex_unlock(&kvm->arch.hyperv.hv_lock);
1011 }
1012
1013 static int kvm_hv_set_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data,
1014                              bool host)
1015 {
1016         struct kvm *kvm = vcpu->kvm;
1017         struct kvm_hv *hv = &kvm->arch.hyperv;
1018
1019         switch (msr) {
1020         case HV_X64_MSR_GUEST_OS_ID:
1021                 hv->hv_guest_os_id = data;
1022                 /* setting guest os id to zero disables hypercall page */
1023                 if (!hv->hv_guest_os_id)
1024                         hv->hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE;
1025                 break;
1026         case HV_X64_MSR_HYPERCALL: {
1027                 u64 gfn;
1028                 unsigned long addr;
1029                 u8 instructions[4];
1030
1031                 /* if guest os id is not set hypercall should remain disabled */
1032                 if (!hv->hv_guest_os_id)
1033                         break;
1034                 if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) {
1035                         hv->hv_hypercall = data;
1036                         break;
1037                 }
1038                 gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT;
1039                 addr = gfn_to_hva(kvm, gfn);
1040                 if (kvm_is_error_hva(addr))
1041                         return 1;
1042                 kvm_x86_ops->patch_hypercall(vcpu, instructions);
1043                 ((unsigned char *)instructions)[3] = 0xc3; /* ret */
1044                 if (__copy_to_user((void __user *)addr, instructions, 4))
1045                         return 1;
1046                 hv->hv_hypercall = data;
1047                 mark_page_dirty(kvm, gfn);
1048                 break;
1049         }
1050         case HV_X64_MSR_REFERENCE_TSC:
1051                 hv->hv_tsc_page = data;
1052                 if (hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE)
1053                         kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
1054                 break;
1055         case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
1056                 return kvm_hv_msr_set_crash_data(vcpu,
1057                                                  msr - HV_X64_MSR_CRASH_P0,
1058                                                  data);
1059         case HV_X64_MSR_CRASH_CTL:
1060                 return kvm_hv_msr_set_crash_ctl(vcpu, data, host);
1061         case HV_X64_MSR_RESET:
1062                 if (data == 1) {
1063                         vcpu_debug(vcpu, "hyper-v reset requested\n");
1064                         kvm_make_request(KVM_REQ_HV_RESET, vcpu);
1065                 }
1066                 break;
1067         case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
1068                 hv->hv_reenlightenment_control = data;
1069                 break;
1070         case HV_X64_MSR_TSC_EMULATION_CONTROL:
1071                 hv->hv_tsc_emulation_control = data;
1072                 break;
1073         case HV_X64_MSR_TSC_EMULATION_STATUS:
1074                 hv->hv_tsc_emulation_status = data;
1075                 break;
1076         case HV_X64_MSR_TIME_REF_COUNT:
1077                 /* read-only, but still ignore it if host-initiated */
1078                 if (!host)
1079                         return 1;
1080                 break;
1081         default:
1082                 vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
1083                             msr, data);
1084                 return 1;
1085         }
1086         return 0;
1087 }
1088
1089 /* Calculate cpu time spent by current task in 100ns units */
1090 static u64 current_task_runtime_100ns(void)
1091 {
1092         u64 utime, stime;
1093
1094         task_cputime_adjusted(current, &utime, &stime);
1095
1096         return div_u64(utime + stime, 100);
1097 }
1098
1099 static int kvm_hv_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
1100 {
1101         struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv;
1102
1103         switch (msr) {
1104         case HV_X64_MSR_VP_INDEX: {
1105                 struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
1106                 int vcpu_idx = kvm_vcpu_get_idx(vcpu);
1107                 u32 new_vp_index = (u32)data;
1108
1109                 if (!host || new_vp_index >= KVM_MAX_VCPUS)
1110                         return 1;
1111
1112                 if (new_vp_index == hv_vcpu->vp_index)
1113                         return 0;
1114
1115                 /*
1116                  * The VP index is initialized to vcpu_index by
1117                  * kvm_hv_vcpu_postcreate so they initially match.  Now the
1118                  * VP index is changing, adjust num_mismatched_vp_indexes if
1119                  * it now matches or no longer matches vcpu_idx.
1120                  */
1121                 if (hv_vcpu->vp_index == vcpu_idx)
1122                         atomic_inc(&hv->num_mismatched_vp_indexes);
1123                 else if (new_vp_index == vcpu_idx)
1124                         atomic_dec(&hv->num_mismatched_vp_indexes);
1125
1126                 hv_vcpu->vp_index = new_vp_index;
1127                 break;
1128         }
1129         case HV_X64_MSR_VP_ASSIST_PAGE: {
1130                 u64 gfn;
1131                 unsigned long addr;
1132
1133                 if (!(data & HV_X64_MSR_VP_ASSIST_PAGE_ENABLE)) {
1134                         hv_vcpu->hv_vapic = data;
1135                         if (kvm_lapic_enable_pv_eoi(vcpu, 0, 0))
1136                                 return 1;
1137                         break;
1138                 }
1139                 gfn = data >> HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_SHIFT;
1140                 addr = kvm_vcpu_gfn_to_hva(vcpu, gfn);
1141                 if (kvm_is_error_hva(addr))
1142                         return 1;
1143
1144                 /*
1145                  * Clear apic_assist portion of f(struct hv_vp_assist_page
1146                  * only, there can be valuable data in the rest which needs
1147                  * to be preserved e.g. on migration.
1148                  */
1149                 if (__clear_user((void __user *)addr, sizeof(u32)))
1150                         return 1;
1151                 hv_vcpu->hv_vapic = data;
1152                 kvm_vcpu_mark_page_dirty(vcpu, gfn);
1153                 if (kvm_lapic_enable_pv_eoi(vcpu,
1154                                             gfn_to_gpa(gfn) | KVM_MSR_ENABLED,
1155                                             sizeof(struct hv_vp_assist_page)))
1156                         return 1;
1157                 break;
1158         }
1159         case HV_X64_MSR_EOI:
1160                 return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data);
1161         case HV_X64_MSR_ICR:
1162                 return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data);
1163         case HV_X64_MSR_TPR:
1164                 return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data);
1165         case HV_X64_MSR_VP_RUNTIME:
1166                 if (!host)
1167                         return 1;
1168                 hv_vcpu->runtime_offset = data - current_task_runtime_100ns();
1169                 break;
1170         case HV_X64_MSR_SCONTROL:
1171         case HV_X64_MSR_SVERSION:
1172         case HV_X64_MSR_SIEFP:
1173         case HV_X64_MSR_SIMP:
1174         case HV_X64_MSR_EOM:
1175         case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
1176                 return synic_set_msr(vcpu_to_synic(vcpu), msr, data, host);
1177         case HV_X64_MSR_STIMER0_CONFIG:
1178         case HV_X64_MSR_STIMER1_CONFIG:
1179         case HV_X64_MSR_STIMER2_CONFIG:
1180         case HV_X64_MSR_STIMER3_CONFIG: {
1181                 int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2;
1182
1183                 return stimer_set_config(vcpu_to_stimer(vcpu, timer_index),
1184                                          data, host);
1185         }
1186         case HV_X64_MSR_STIMER0_COUNT:
1187         case HV_X64_MSR_STIMER1_COUNT:
1188         case HV_X64_MSR_STIMER2_COUNT:
1189         case HV_X64_MSR_STIMER3_COUNT: {
1190                 int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2;
1191
1192                 return stimer_set_count(vcpu_to_stimer(vcpu, timer_index),
1193                                         data, host);
1194         }
1195         case HV_X64_MSR_TSC_FREQUENCY:
1196         case HV_X64_MSR_APIC_FREQUENCY:
1197                 /* read-only, but still ignore it if host-initiated */
1198                 if (!host)
1199                         return 1;
1200                 break;
1201         default:
1202                 vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
1203                             msr, data);
1204                 return 1;
1205         }
1206
1207         return 0;
1208 }
1209
1210 static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1211 {
1212         u64 data = 0;
1213         struct kvm *kvm = vcpu->kvm;
1214         struct kvm_hv *hv = &kvm->arch.hyperv;
1215
1216         switch (msr) {
1217         case HV_X64_MSR_GUEST_OS_ID:
1218                 data = hv->hv_guest_os_id;
1219                 break;
1220         case HV_X64_MSR_HYPERCALL:
1221                 data = hv->hv_hypercall;
1222                 break;
1223         case HV_X64_MSR_TIME_REF_COUNT:
1224                 data = get_time_ref_counter(kvm);
1225                 break;
1226         case HV_X64_MSR_REFERENCE_TSC:
1227                 data = hv->hv_tsc_page;
1228                 break;
1229         case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
1230                 return kvm_hv_msr_get_crash_data(vcpu,
1231                                                  msr - HV_X64_MSR_CRASH_P0,
1232                                                  pdata);
1233         case HV_X64_MSR_CRASH_CTL:
1234                 return kvm_hv_msr_get_crash_ctl(vcpu, pdata);
1235         case HV_X64_MSR_RESET:
1236                 data = 0;
1237                 break;
1238         case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
1239                 data = hv->hv_reenlightenment_control;
1240                 break;
1241         case HV_X64_MSR_TSC_EMULATION_CONTROL:
1242                 data = hv->hv_tsc_emulation_control;
1243                 break;
1244         case HV_X64_MSR_TSC_EMULATION_STATUS:
1245                 data = hv->hv_tsc_emulation_status;
1246                 break;
1247         default:
1248                 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1249                 return 1;
1250         }
1251
1252         *pdata = data;
1253         return 0;
1254 }
1255
1256 static int kvm_hv_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata,
1257                           bool host)
1258 {
1259         u64 data = 0;
1260         struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv;
1261
1262         switch (msr) {
1263         case HV_X64_MSR_VP_INDEX:
1264                 data = hv_vcpu->vp_index;
1265                 break;
1266         case HV_X64_MSR_EOI:
1267                 return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata);
1268         case HV_X64_MSR_ICR:
1269                 return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata);
1270         case HV_X64_MSR_TPR:
1271                 return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata);
1272         case HV_X64_MSR_VP_ASSIST_PAGE:
1273                 data = hv_vcpu->hv_vapic;
1274                 break;
1275         case HV_X64_MSR_VP_RUNTIME:
1276                 data = current_task_runtime_100ns() + hv_vcpu->runtime_offset;
1277                 break;
1278         case HV_X64_MSR_SCONTROL:
1279         case HV_X64_MSR_SVERSION:
1280         case HV_X64_MSR_SIEFP:
1281         case HV_X64_MSR_SIMP:
1282         case HV_X64_MSR_EOM:
1283         case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
1284                 return synic_get_msr(vcpu_to_synic(vcpu), msr, pdata, host);
1285         case HV_X64_MSR_STIMER0_CONFIG:
1286         case HV_X64_MSR_STIMER1_CONFIG:
1287         case HV_X64_MSR_STIMER2_CONFIG:
1288         case HV_X64_MSR_STIMER3_CONFIG: {
1289                 int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2;
1290
1291                 return stimer_get_config(vcpu_to_stimer(vcpu, timer_index),
1292                                          pdata);
1293         }
1294         case HV_X64_MSR_STIMER0_COUNT:
1295         case HV_X64_MSR_STIMER1_COUNT:
1296         case HV_X64_MSR_STIMER2_COUNT:
1297         case HV_X64_MSR_STIMER3_COUNT: {
1298                 int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2;
1299
1300                 return stimer_get_count(vcpu_to_stimer(vcpu, timer_index),
1301                                         pdata);
1302         }
1303         case HV_X64_MSR_TSC_FREQUENCY:
1304                 data = (u64)vcpu->arch.virtual_tsc_khz * 1000;
1305                 break;
1306         case HV_X64_MSR_APIC_FREQUENCY:
1307                 data = APIC_BUS_FREQUENCY;
1308                 break;
1309         default:
1310                 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1311                 return 1;
1312         }
1313         *pdata = data;
1314         return 0;
1315 }
1316
1317 int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
1318 {
1319         if (kvm_hv_msr_partition_wide(msr)) {
1320                 int r;
1321
1322                 mutex_lock(&vcpu->kvm->arch.hyperv.hv_lock);
1323                 r = kvm_hv_set_msr_pw(vcpu, msr, data, host);
1324                 mutex_unlock(&vcpu->kvm->arch.hyperv.hv_lock);
1325                 return r;
1326         } else
1327                 return kvm_hv_set_msr(vcpu, msr, data, host);
1328 }
1329
1330 int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host)
1331 {
1332         if (kvm_hv_msr_partition_wide(msr)) {
1333                 int r;
1334
1335                 mutex_lock(&vcpu->kvm->arch.hyperv.hv_lock);
1336                 r = kvm_hv_get_msr_pw(vcpu, msr, pdata);
1337                 mutex_unlock(&vcpu->kvm->arch.hyperv.hv_lock);
1338                 return r;
1339         } else
1340                 return kvm_hv_get_msr(vcpu, msr, pdata, host);
1341 }
1342
1343 static __always_inline unsigned long *sparse_set_to_vcpu_mask(
1344         struct kvm *kvm, u64 *sparse_banks, u64 valid_bank_mask,
1345         u64 *vp_bitmap, unsigned long *vcpu_bitmap)
1346 {
1347         struct kvm_hv *hv = &kvm->arch.hyperv;
1348         struct kvm_vcpu *vcpu;
1349         int i, bank, sbank = 0;
1350
1351         memset(vp_bitmap, 0,
1352                KVM_HV_MAX_SPARSE_VCPU_SET_BITS * sizeof(*vp_bitmap));
1353         for_each_set_bit(bank, (unsigned long *)&valid_bank_mask,
1354                          KVM_HV_MAX_SPARSE_VCPU_SET_BITS)
1355                 vp_bitmap[bank] = sparse_banks[sbank++];
1356
1357         if (likely(!atomic_read(&hv->num_mismatched_vp_indexes))) {
1358                 /* for all vcpus vp_index == vcpu_idx */
1359                 return (unsigned long *)vp_bitmap;
1360         }
1361
1362         bitmap_zero(vcpu_bitmap, KVM_MAX_VCPUS);
1363         kvm_for_each_vcpu(i, vcpu, kvm) {
1364                 if (test_bit(vcpu_to_hv_vcpu(vcpu)->vp_index,
1365                              (unsigned long *)vp_bitmap))
1366                         __set_bit(i, vcpu_bitmap);
1367         }
1368         return vcpu_bitmap;
1369 }
1370
1371 static u64 kvm_hv_flush_tlb(struct kvm_vcpu *current_vcpu, u64 ingpa,
1372                             u16 rep_cnt, bool ex)
1373 {
1374         struct kvm *kvm = current_vcpu->kvm;
1375         struct kvm_vcpu_hv *hv_vcpu = &current_vcpu->arch.hyperv;
1376         struct hv_tlb_flush_ex flush_ex;
1377         struct hv_tlb_flush flush;
1378         u64 vp_bitmap[KVM_HV_MAX_SPARSE_VCPU_SET_BITS];
1379         DECLARE_BITMAP(vcpu_bitmap, KVM_MAX_VCPUS);
1380         unsigned long *vcpu_mask;
1381         u64 valid_bank_mask;
1382         u64 sparse_banks[64];
1383         int sparse_banks_len;
1384         bool all_cpus;
1385
1386         if (!ex) {
1387                 if (unlikely(kvm_read_guest(kvm, ingpa, &flush, sizeof(flush))))
1388                         return HV_STATUS_INVALID_HYPERCALL_INPUT;
1389
1390                 trace_kvm_hv_flush_tlb(flush.processor_mask,
1391                                        flush.address_space, flush.flags);
1392
1393                 valid_bank_mask = BIT_ULL(0);
1394                 sparse_banks[0] = flush.processor_mask;
1395
1396                 /*
1397                  * Work around possible WS2012 bug: it sends hypercalls
1398                  * with processor_mask = 0x0 and HV_FLUSH_ALL_PROCESSORS clear,
1399                  * while also expecting us to flush something and crashing if
1400                  * we don't. Let's treat processor_mask == 0 same as
1401                  * HV_FLUSH_ALL_PROCESSORS.
1402                  */
1403                 all_cpus = (flush.flags & HV_FLUSH_ALL_PROCESSORS) ||
1404                         flush.processor_mask == 0;
1405         } else {
1406                 if (unlikely(kvm_read_guest(kvm, ingpa, &flush_ex,
1407                                             sizeof(flush_ex))))
1408                         return HV_STATUS_INVALID_HYPERCALL_INPUT;
1409
1410                 trace_kvm_hv_flush_tlb_ex(flush_ex.hv_vp_set.valid_bank_mask,
1411                                           flush_ex.hv_vp_set.format,
1412                                           flush_ex.address_space,
1413                                           flush_ex.flags);
1414
1415                 valid_bank_mask = flush_ex.hv_vp_set.valid_bank_mask;
1416                 all_cpus = flush_ex.hv_vp_set.format !=
1417                         HV_GENERIC_SET_SPARSE_4K;
1418
1419                 sparse_banks_len =
1420                         bitmap_weight((unsigned long *)&valid_bank_mask, 64) *
1421                         sizeof(sparse_banks[0]);
1422
1423                 if (!sparse_banks_len && !all_cpus)
1424                         goto ret_success;
1425
1426                 if (!all_cpus &&
1427                     kvm_read_guest(kvm,
1428                                    ingpa + offsetof(struct hv_tlb_flush_ex,
1429                                                     hv_vp_set.bank_contents),
1430                                    sparse_banks,
1431                                    sparse_banks_len))
1432                         return HV_STATUS_INVALID_HYPERCALL_INPUT;
1433         }
1434
1435         cpumask_clear(&hv_vcpu->tlb_flush);
1436
1437         vcpu_mask = all_cpus ? NULL :
1438                 sparse_set_to_vcpu_mask(kvm, sparse_banks, valid_bank_mask,
1439                                         vp_bitmap, vcpu_bitmap);
1440
1441         /*
1442          * vcpu->arch.cr3 may not be up-to-date for running vCPUs so we can't
1443          * analyze it here, flush TLB regardless of the specified address space.
1444          */
1445         kvm_make_vcpus_request_mask(kvm,
1446                                     KVM_REQ_TLB_FLUSH | KVM_REQUEST_NO_WAKEUP,
1447                                     vcpu_mask, &hv_vcpu->tlb_flush);
1448
1449 ret_success:
1450         /* We always do full TLB flush, set rep_done = rep_cnt. */
1451         return (u64)HV_STATUS_SUCCESS |
1452                 ((u64)rep_cnt << HV_HYPERCALL_REP_COMP_OFFSET);
1453 }
1454
1455 static void kvm_send_ipi_to_many(struct kvm *kvm, u32 vector,
1456                                  unsigned long *vcpu_bitmap)
1457 {
1458         struct kvm_lapic_irq irq = {
1459                 .delivery_mode = APIC_DM_FIXED,
1460                 .vector = vector
1461         };
1462         struct kvm_vcpu *vcpu;
1463         int i;
1464
1465         kvm_for_each_vcpu(i, vcpu, kvm) {
1466                 if (vcpu_bitmap && !test_bit(i, vcpu_bitmap))
1467                         continue;
1468
1469                 /* We fail only when APIC is disabled */
1470                 kvm_apic_set_irq(vcpu, &irq, NULL);
1471         }
1472 }
1473
1474 static u64 kvm_hv_send_ipi(struct kvm_vcpu *current_vcpu, u64 ingpa, u64 outgpa,
1475                            bool ex, bool fast)
1476 {
1477         struct kvm *kvm = current_vcpu->kvm;
1478         struct hv_send_ipi_ex send_ipi_ex;
1479         struct hv_send_ipi send_ipi;
1480         u64 vp_bitmap[KVM_HV_MAX_SPARSE_VCPU_SET_BITS];
1481         DECLARE_BITMAP(vcpu_bitmap, KVM_MAX_VCPUS);
1482         unsigned long *vcpu_mask;
1483         unsigned long valid_bank_mask;
1484         u64 sparse_banks[64];
1485         int sparse_banks_len;
1486         u32 vector;
1487         bool all_cpus;
1488
1489         if (!ex) {
1490                 if (!fast) {
1491                         if (unlikely(kvm_read_guest(kvm, ingpa, &send_ipi,
1492                                                     sizeof(send_ipi))))
1493                                 return HV_STATUS_INVALID_HYPERCALL_INPUT;
1494                         sparse_banks[0] = send_ipi.cpu_mask;
1495                         vector = send_ipi.vector;
1496                 } else {
1497                         /* 'reserved' part of hv_send_ipi should be 0 */
1498                         if (unlikely(ingpa >> 32 != 0))
1499                                 return HV_STATUS_INVALID_HYPERCALL_INPUT;
1500                         sparse_banks[0] = outgpa;
1501                         vector = (u32)ingpa;
1502                 }
1503                 all_cpus = false;
1504                 valid_bank_mask = BIT_ULL(0);
1505
1506                 trace_kvm_hv_send_ipi(vector, sparse_banks[0]);
1507         } else {
1508                 if (unlikely(kvm_read_guest(kvm, ingpa, &send_ipi_ex,
1509                                             sizeof(send_ipi_ex))))
1510                         return HV_STATUS_INVALID_HYPERCALL_INPUT;
1511
1512                 trace_kvm_hv_send_ipi_ex(send_ipi_ex.vector,
1513                                          send_ipi_ex.vp_set.format,
1514                                          send_ipi_ex.vp_set.valid_bank_mask);
1515
1516                 vector = send_ipi_ex.vector;
1517                 valid_bank_mask = send_ipi_ex.vp_set.valid_bank_mask;
1518                 sparse_banks_len = bitmap_weight(&valid_bank_mask, 64) *
1519                         sizeof(sparse_banks[0]);
1520
1521                 all_cpus = send_ipi_ex.vp_set.format == HV_GENERIC_SET_ALL;
1522
1523                 if (all_cpus)
1524                         goto check_and_send_ipi;
1525
1526                 if (!sparse_banks_len)
1527                         goto ret_success;
1528
1529                 if (kvm_read_guest(kvm,
1530                                    ingpa + offsetof(struct hv_send_ipi_ex,
1531                                                     vp_set.bank_contents),
1532                                    sparse_banks,
1533                                    sparse_banks_len))
1534                         return HV_STATUS_INVALID_HYPERCALL_INPUT;
1535         }
1536
1537 check_and_send_ipi:
1538         if ((vector < HV_IPI_LOW_VECTOR) || (vector > HV_IPI_HIGH_VECTOR))
1539                 return HV_STATUS_INVALID_HYPERCALL_INPUT;
1540
1541         vcpu_mask = all_cpus ? NULL :
1542                 sparse_set_to_vcpu_mask(kvm, sparse_banks, valid_bank_mask,
1543                                         vp_bitmap, vcpu_bitmap);
1544
1545         kvm_send_ipi_to_many(kvm, vector, vcpu_mask);
1546
1547 ret_success:
1548         return HV_STATUS_SUCCESS;
1549 }
1550
1551 bool kvm_hv_hypercall_enabled(struct kvm *kvm)
1552 {
1553         return READ_ONCE(kvm->arch.hyperv.hv_hypercall) & HV_X64_MSR_HYPERCALL_ENABLE;
1554 }
1555
1556 static void kvm_hv_hypercall_set_result(struct kvm_vcpu *vcpu, u64 result)
1557 {
1558         bool longmode;
1559
1560         longmode = is_64_bit_mode(vcpu);
1561         if (longmode)
1562                 kvm_rax_write(vcpu, result);
1563         else {
1564                 kvm_rdx_write(vcpu, result >> 32);
1565                 kvm_rax_write(vcpu, result & 0xffffffff);
1566         }
1567 }
1568
1569 static int kvm_hv_hypercall_complete(struct kvm_vcpu *vcpu, u64 result)
1570 {
1571         kvm_hv_hypercall_set_result(vcpu, result);
1572         ++vcpu->stat.hypercalls;
1573         return kvm_skip_emulated_instruction(vcpu);
1574 }
1575
1576 static int kvm_hv_hypercall_complete_userspace(struct kvm_vcpu *vcpu)
1577 {
1578         return kvm_hv_hypercall_complete(vcpu, vcpu->run->hyperv.u.hcall.result);
1579 }
1580
1581 static u16 kvm_hvcall_signal_event(struct kvm_vcpu *vcpu, bool fast, u64 param)
1582 {
1583         struct eventfd_ctx *eventfd;
1584
1585         if (unlikely(!fast)) {
1586                 int ret;
1587                 gpa_t gpa = param;
1588
1589                 if ((gpa & (__alignof__(param) - 1)) ||
1590                     offset_in_page(gpa) + sizeof(param) > PAGE_SIZE)
1591                         return HV_STATUS_INVALID_ALIGNMENT;
1592
1593                 ret = kvm_vcpu_read_guest(vcpu, gpa, &param, sizeof(param));
1594                 if (ret < 0)
1595                         return HV_STATUS_INVALID_ALIGNMENT;
1596         }
1597
1598         /*
1599          * Per spec, bits 32-47 contain the extra "flag number".  However, we
1600          * have no use for it, and in all known usecases it is zero, so just
1601          * report lookup failure if it isn't.
1602          */
1603         if (param & 0xffff00000000ULL)
1604                 return HV_STATUS_INVALID_PORT_ID;
1605         /* remaining bits are reserved-zero */
1606         if (param & ~KVM_HYPERV_CONN_ID_MASK)
1607                 return HV_STATUS_INVALID_HYPERCALL_INPUT;
1608
1609         /* the eventfd is protected by vcpu->kvm->srcu, but conn_to_evt isn't */
1610         rcu_read_lock();
1611         eventfd = idr_find(&vcpu->kvm->arch.hyperv.conn_to_evt, param);
1612         rcu_read_unlock();
1613         if (!eventfd)
1614                 return HV_STATUS_INVALID_PORT_ID;
1615
1616         eventfd_signal(eventfd, 1);
1617         return HV_STATUS_SUCCESS;
1618 }
1619
1620 int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
1621 {
1622         u64 param, ingpa, outgpa, ret = HV_STATUS_SUCCESS;
1623         uint16_t code, rep_idx, rep_cnt;
1624         bool fast, rep;
1625
1626         /*
1627          * hypercall generates UD from non zero cpl and real mode
1628          * per HYPER-V spec
1629          */
1630         if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) {
1631                 kvm_queue_exception(vcpu, UD_VECTOR);
1632                 return 1;
1633         }
1634
1635 #ifdef CONFIG_X86_64
1636         if (is_64_bit_mode(vcpu)) {
1637                 param = kvm_rcx_read(vcpu);
1638                 ingpa = kvm_rdx_read(vcpu);
1639                 outgpa = kvm_r8_read(vcpu);
1640         } else
1641 #endif
1642         {
1643                 param = ((u64)kvm_rdx_read(vcpu) << 32) |
1644                         (kvm_rax_read(vcpu) & 0xffffffff);
1645                 ingpa = ((u64)kvm_rbx_read(vcpu) << 32) |
1646                         (kvm_rcx_read(vcpu) & 0xffffffff);
1647                 outgpa = ((u64)kvm_rdi_read(vcpu) << 32) |
1648                         (kvm_rsi_read(vcpu) & 0xffffffff);
1649         }
1650
1651         code = param & 0xffff;
1652         fast = !!(param & HV_HYPERCALL_FAST_BIT);
1653         rep_cnt = (param >> HV_HYPERCALL_REP_COMP_OFFSET) & 0xfff;
1654         rep_idx = (param >> HV_HYPERCALL_REP_START_OFFSET) & 0xfff;
1655         rep = !!(rep_cnt || rep_idx);
1656
1657         trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa);
1658
1659         switch (code) {
1660         case HVCALL_NOTIFY_LONG_SPIN_WAIT:
1661                 if (unlikely(rep)) {
1662                         ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
1663                         break;
1664                 }
1665                 kvm_vcpu_on_spin(vcpu, true);
1666                 break;
1667         case HVCALL_SIGNAL_EVENT:
1668                 if (unlikely(rep)) {
1669                         ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
1670                         break;
1671                 }
1672                 ret = kvm_hvcall_signal_event(vcpu, fast, ingpa);
1673                 if (ret != HV_STATUS_INVALID_PORT_ID)
1674                         break;
1675                 /* fall through - maybe userspace knows this conn_id. */
1676         case HVCALL_POST_MESSAGE:
1677                 /* don't bother userspace if it has no way to handle it */
1678                 if (unlikely(rep || !vcpu_to_synic(vcpu)->active)) {
1679                         ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
1680                         break;
1681                 }
1682                 vcpu->run->exit_reason = KVM_EXIT_HYPERV;
1683                 vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL;
1684                 vcpu->run->hyperv.u.hcall.input = param;
1685                 vcpu->run->hyperv.u.hcall.params[0] = ingpa;
1686                 vcpu->run->hyperv.u.hcall.params[1] = outgpa;
1687                 vcpu->arch.complete_userspace_io =
1688                                 kvm_hv_hypercall_complete_userspace;
1689                 return 0;
1690         case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST:
1691                 if (unlikely(fast || !rep_cnt || rep_idx)) {
1692                         ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
1693                         break;
1694                 }
1695                 ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt, false);
1696                 break;
1697         case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE:
1698                 if (unlikely(fast || rep)) {
1699                         ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
1700                         break;
1701                 }
1702                 ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt, false);
1703                 break;
1704         case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX:
1705                 if (unlikely(fast || !rep_cnt || rep_idx)) {
1706                         ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
1707                         break;
1708                 }
1709                 ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt, true);
1710                 break;
1711         case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX:
1712                 if (unlikely(fast || rep)) {
1713                         ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
1714                         break;
1715                 }
1716                 ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt, true);
1717                 break;
1718         case HVCALL_SEND_IPI:
1719                 if (unlikely(rep)) {
1720                         ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
1721                         break;
1722                 }
1723                 ret = kvm_hv_send_ipi(vcpu, ingpa, outgpa, false, fast);
1724                 break;
1725         case HVCALL_SEND_IPI_EX:
1726                 if (unlikely(fast || rep)) {
1727                         ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
1728                         break;
1729                 }
1730                 ret = kvm_hv_send_ipi(vcpu, ingpa, outgpa, true, false);
1731                 break;
1732         default:
1733                 ret = HV_STATUS_INVALID_HYPERCALL_CODE;
1734                 break;
1735         }
1736
1737         return kvm_hv_hypercall_complete(vcpu, ret);
1738 }
1739
1740 void kvm_hv_init_vm(struct kvm *kvm)
1741 {
1742         mutex_init(&kvm->arch.hyperv.hv_lock);
1743         idr_init(&kvm->arch.hyperv.conn_to_evt);
1744 }
1745
1746 void kvm_hv_destroy_vm(struct kvm *kvm)
1747 {
1748         struct eventfd_ctx *eventfd;
1749         int i;
1750
1751         idr_for_each_entry(&kvm->arch.hyperv.conn_to_evt, eventfd, i)
1752                 eventfd_ctx_put(eventfd);
1753         idr_destroy(&kvm->arch.hyperv.conn_to_evt);
1754 }
1755
1756 static int kvm_hv_eventfd_assign(struct kvm *kvm, u32 conn_id, int fd)
1757 {
1758         struct kvm_hv *hv = &kvm->arch.hyperv;
1759         struct eventfd_ctx *eventfd;
1760         int ret;
1761
1762         eventfd = eventfd_ctx_fdget(fd);
1763         if (IS_ERR(eventfd))
1764                 return PTR_ERR(eventfd);
1765
1766         mutex_lock(&hv->hv_lock);
1767         ret = idr_alloc(&hv->conn_to_evt, eventfd, conn_id, conn_id + 1,
1768                         GFP_KERNEL_ACCOUNT);
1769         mutex_unlock(&hv->hv_lock);
1770
1771         if (ret >= 0)
1772                 return 0;
1773
1774         if (ret == -ENOSPC)
1775                 ret = -EEXIST;
1776         eventfd_ctx_put(eventfd);
1777         return ret;
1778 }
1779
1780 static int kvm_hv_eventfd_deassign(struct kvm *kvm, u32 conn_id)
1781 {
1782         struct kvm_hv *hv = &kvm->arch.hyperv;
1783         struct eventfd_ctx *eventfd;
1784
1785         mutex_lock(&hv->hv_lock);
1786         eventfd = idr_remove(&hv->conn_to_evt, conn_id);
1787         mutex_unlock(&hv->hv_lock);
1788
1789         if (!eventfd)
1790                 return -ENOENT;
1791
1792         synchronize_srcu(&kvm->srcu);
1793         eventfd_ctx_put(eventfd);
1794         return 0;
1795 }
1796
1797 int kvm_vm_ioctl_hv_eventfd(struct kvm *kvm, struct kvm_hyperv_eventfd *args)
1798 {
1799         if ((args->flags & ~KVM_HYPERV_EVENTFD_DEASSIGN) ||
1800             (args->conn_id & ~KVM_HYPERV_CONN_ID_MASK))
1801                 return -EINVAL;
1802
1803         if (args->flags == KVM_HYPERV_EVENTFD_DEASSIGN)
1804                 return kvm_hv_eventfd_deassign(kvm, args->conn_id);
1805         return kvm_hv_eventfd_assign(kvm, args->conn_id, args->fd);
1806 }
1807
1808 int kvm_vcpu_ioctl_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid,
1809                                 struct kvm_cpuid_entry2 __user *entries)
1810 {
1811         uint16_t evmcs_ver = 0;
1812         struct kvm_cpuid_entry2 cpuid_entries[] = {
1813                 { .function = HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS },
1814                 { .function = HYPERV_CPUID_INTERFACE },
1815                 { .function = HYPERV_CPUID_VERSION },
1816                 { .function = HYPERV_CPUID_FEATURES },
1817                 { .function = HYPERV_CPUID_ENLIGHTMENT_INFO },
1818                 { .function = HYPERV_CPUID_IMPLEMENT_LIMITS },
1819                 { .function = HYPERV_CPUID_NESTED_FEATURES },
1820         };
1821         int i, nent = ARRAY_SIZE(cpuid_entries);
1822
1823         if (kvm_x86_ops->nested_get_evmcs_version)
1824                 evmcs_ver = kvm_x86_ops->nested_get_evmcs_version(vcpu);
1825
1826         /* Skip NESTED_FEATURES if eVMCS is not supported */
1827         if (!evmcs_ver)
1828                 --nent;
1829
1830         if (cpuid->nent < nent)
1831                 return -E2BIG;
1832
1833         if (cpuid->nent > nent)
1834                 cpuid->nent = nent;
1835
1836         for (i = 0; i < nent; i++) {
1837                 struct kvm_cpuid_entry2 *ent = &cpuid_entries[i];
1838                 u32 signature[3];
1839
1840                 switch (ent->function) {
1841                 case HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS:
1842                         memcpy(signature, "Linux KVM Hv", 12);
1843
1844                         ent->eax = HYPERV_CPUID_NESTED_FEATURES;
1845                         ent->ebx = signature[0];
1846                         ent->ecx = signature[1];
1847                         ent->edx = signature[2];
1848                         break;
1849
1850                 case HYPERV_CPUID_INTERFACE:
1851                         memcpy(signature, "Hv#1\0\0\0\0\0\0\0\0", 12);
1852                         ent->eax = signature[0];
1853                         break;
1854
1855                 case HYPERV_CPUID_VERSION:
1856                         /*
1857                          * We implement some Hyper-V 2016 functions so let's use
1858                          * this version.
1859                          */
1860                         ent->eax = 0x00003839;
1861                         ent->ebx = 0x000A0000;
1862                         break;
1863
1864                 case HYPERV_CPUID_FEATURES:
1865                         ent->eax |= HV_X64_MSR_VP_RUNTIME_AVAILABLE;
1866                         ent->eax |= HV_MSR_TIME_REF_COUNT_AVAILABLE;
1867                         ent->eax |= HV_X64_MSR_SYNIC_AVAILABLE;
1868                         ent->eax |= HV_MSR_SYNTIMER_AVAILABLE;
1869                         ent->eax |= HV_X64_MSR_APIC_ACCESS_AVAILABLE;
1870                         ent->eax |= HV_X64_MSR_HYPERCALL_AVAILABLE;
1871                         ent->eax |= HV_X64_MSR_VP_INDEX_AVAILABLE;
1872                         ent->eax |= HV_X64_MSR_RESET_AVAILABLE;
1873                         ent->eax |= HV_MSR_REFERENCE_TSC_AVAILABLE;
1874                         ent->eax |= HV_X64_ACCESS_FREQUENCY_MSRS;
1875                         ent->eax |= HV_X64_ACCESS_REENLIGHTENMENT;
1876
1877                         ent->ebx |= HV_X64_POST_MESSAGES;
1878                         ent->ebx |= HV_X64_SIGNAL_EVENTS;
1879
1880                         ent->edx |= HV_FEATURE_FREQUENCY_MSRS_AVAILABLE;
1881                         ent->edx |= HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE;
1882
1883                         /*
1884                          * Direct Synthetic timers only make sense with in-kernel
1885                          * LAPIC
1886                          */
1887                         if (lapic_in_kernel(vcpu))
1888                                 ent->edx |= HV_STIMER_DIRECT_MODE_AVAILABLE;
1889
1890                         break;
1891
1892                 case HYPERV_CPUID_ENLIGHTMENT_INFO:
1893                         ent->eax |= HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED;
1894                         ent->eax |= HV_X64_APIC_ACCESS_RECOMMENDED;
1895                         ent->eax |= HV_X64_RELAXED_TIMING_RECOMMENDED;
1896                         ent->eax |= HV_X64_CLUSTER_IPI_RECOMMENDED;
1897                         ent->eax |= HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED;
1898                         if (evmcs_ver)
1899                                 ent->eax |= HV_X64_ENLIGHTENED_VMCS_RECOMMENDED;
1900                         if (!cpu_smt_possible())
1901                                 ent->eax |= HV_X64_NO_NONARCH_CORESHARING;
1902                         /*
1903                          * Default number of spinlock retry attempts, matches
1904                          * HyperV 2016.
1905                          */
1906                         ent->ebx = 0x00000FFF;
1907
1908                         break;
1909
1910                 case HYPERV_CPUID_IMPLEMENT_LIMITS:
1911                         /* Maximum number of virtual processors */
1912                         ent->eax = KVM_MAX_VCPUS;
1913                         /*
1914                          * Maximum number of logical processors, matches
1915                          * HyperV 2016.
1916                          */
1917                         ent->ebx = 64;
1918
1919                         break;
1920
1921                 case HYPERV_CPUID_NESTED_FEATURES:
1922                         ent->eax = evmcs_ver;
1923
1924                         break;
1925
1926                 default:
1927                         break;
1928                 }
1929         }
1930
1931         if (copy_to_user(entries, cpuid_entries,
1932                          nent * sizeof(struct kvm_cpuid_entry2)))
1933                 return -EFAULT;
1934
1935         return 0;
1936 }