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