arch/x86/kvm/hyperv.c

   1 /*
   2  * KVM Microsoft Hyper-V emulation
   3  *
   4  * derived from arch/x86/kvm/x86.c
   5  *
   6  * Copyright (C) 2006 Qumranet, Inc.
   7  * Copyright (C) 2008 Qumranet, Inc.
   8  * Copyright IBM Corporation, 2008
   9  * Copyright 2010 Red Hat, Inc. and/or its affiliates.
  10  * Copyright (C) 2015 Andrey Smetanin <asmetanin@virtuozzo.com>
  11  *
  12  * Authors:
  13  *   Avi Kivity   <avi@qumranet.com>
  14  *   Yaniv Kamay  <yaniv@qumranet.com>
  15  *   Amit Shah    <amit.shah@qumranet.com>
  16  *   Ben-Ami Yassour <benami@il.ibm.com>
  17  *   Andrey Smetanin <asmetanin@virtuozzo.com>
  18  *
  19  * This work is licensed under the terms of the GNU GPL, version 2.  See
  20  * the COPYING file in the top-level directory.
  21  *
  22  */
  23
  24 #include "x86.h"
  25 #include "lapic.h"
  26 #include "ioapic.h"
  27 #include "hyperv.h"
  28
  29 #include <linux/kvm_host.h>
  30 #include <linux/highmem.h>
  31 #include <linux/sched/cputime.h>
  32
  33 #include <asm/apicdef.h>
  34 #include <trace/events/kvm.h>
  35
  36 #include "trace.h"
  37
  38 static inline u64 synic_read_sint(struct kvm_vcpu_hv_synic *synic, int sint)
  39 {
  40         return atomic64_read(&synic->sint[sint]);
  41 }
  42
  43 static inline int synic_get_sint_vector(u64 sint_value)
  44 {
  45         if (sint_value & HV_SYNIC_SINT_MASKED)
  46                 return -1;
  47         return sint_value & HV_SYNIC_SINT_VECTOR_MASK;
  48 }
  49
  50 static bool synic_has_vector_connected(struct kvm_vcpu_hv_synic *synic,
  51                                       int vector)
  52 {
  53         int i;
  54
  55         for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
  56                 if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector)
  57                         return true;
  58         }
  59         return false;
  60 }
  61
  62 static bool synic_has_vector_auto_eoi(struct kvm_vcpu_hv_synic *synic,
  63                                      int vector)
  64 {
  65         int i;
  66         u64 sint_value;
  67
  68         for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
  69                 sint_value = synic_read_sint(synic, i);
  70                 if (synic_get_sint_vector(sint_value) == vector &&
  71                     sint_value & HV_SYNIC_SINT_AUTO_EOI)
  72                         return true;
  73         }
  74         return false;
  75 }
  76
  77 static int synic_set_sint(struct kvm_vcpu_hv_synic *synic, int sint,
  78                           u64 data, bool host)
  79 {
  80         int vector;
  81
  82         vector = data & HV_SYNIC_SINT_VECTOR_MASK;
  83         if (vector < 16 && !host)
  84                 return 1;
  85         /*
  86          * Guest may configure multiple SINTs to use the same vector, so
  87          * we maintain a bitmap of vectors handled by synic, and a
  88          * bitmap of vectors with auto-eoi behavior.  The bitmaps are
  89          * updated here, and atomically queried on fast paths.
  90          */
  91
  92         atomic64_set(&synic->sint[sint], data);
  93
  94         if (synic_has_vector_connected(synic, vector))
  95                 __set_bit(vector, synic->vec_bitmap);
  96         else
  97                 __clear_bit(vector, synic->vec_bitmap);
  98
  99         if (synic_has_vector_auto_eoi(synic, vector))
 100                 __set_bit(vector, synic->auto_eoi_bitmap);
 101         else
 102                 __clear_bit(vector, synic->auto_eoi_bitmap);
 103
 104         /* Load SynIC vectors into EOI exit bitmap */
 105         kvm_make_request(KVM_REQ_SCAN_IOAPIC, synic_to_vcpu(synic));
 106         return 0;
 107 }
 108
 109 static struct kvm_vcpu *get_vcpu_by_vpidx(struct kvm *kvm, u32 vpidx)
 110 {
 111         struct kvm_vcpu *vcpu = NULL;
 112         int i;
 113
 114         if (vpidx < KVM_MAX_VCPUS)
 115                 vcpu = kvm_get_vcpu(kvm, vpidx);
 116         if (vcpu && vcpu_to_hv_vcpu(vcpu)->vp_index == vpidx)
 117                 return vcpu;
 118         kvm_for_each_vcpu(i, vcpu, kvm)
 119                 if (vcpu_to_hv_vcpu(vcpu)->vp_index == vpidx)
 120                         return vcpu;
 121         return NULL;
 122 }
 123
 124 static struct kvm_vcpu_hv_synic *synic_get(struct kvm *kvm, u32 vpidx)
 125 {
 126         struct kvm_vcpu *vcpu;
 127         struct kvm_vcpu_hv_synic *synic;
 128
 129         vcpu = get_vcpu_by_vpidx(kvm, vpidx);
 130         if (!vcpu)
 131                 return NULL;
 132         synic = vcpu_to_synic(vcpu);
 133         return (synic->active) ? synic : NULL;
 134 }
 135
 136 static void synic_clear_sint_msg_pending(struct kvm_vcpu_hv_synic *synic,
 137                                         u32 sint)
 138 {
 139         struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
 140         struct page *page;
 141         gpa_t gpa;
 142         struct hv_message *msg;
 143         struct hv_message_page *msg_page;
 144
 145         gpa = synic->msg_page & PAGE_MASK;
 146         page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT);
 147         if (is_error_page(page)) {
 148                 vcpu_err(vcpu, "Hyper-V SynIC can't get msg page, gpa 0x%llx\n",
 149                          gpa);
 150                 return;
 151         }
 152         msg_page = kmap_atomic(page);
 153
 154         msg = &msg_page->sint_message[sint];
 155         msg->header.message_flags.msg_pending = 0;
 156
 157         kunmap_atomic(msg_page);
 158         kvm_release_page_dirty(page);
 159         kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT);
 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, stimers_pending;
 169
 170         trace_kvm_hv_notify_acked_sint(vcpu->vcpu_id, sint);
 171
 172         if (synic->msg_page & HV_SYNIC_SIMP_ENABLE)
 173                 synic_clear_sint_msg_pending(synic, sint);
 174
 175         /* Try to deliver pending Hyper-V SynIC timers messages */
 176         stimers_pending = 0;
 177         for (idx = 0; idx < ARRAY_SIZE(hv_vcpu->stimer); idx++) {
 178                 stimer = &hv_vcpu->stimer[idx];
 179                 if (stimer->msg_pending &&
 180                     (stimer->config & HV_STIMER_ENABLE) &&
 181                     HV_STIMER_SINT(stimer->config) == sint) {
 182                         set_bit(stimer->index,
 183                                 hv_vcpu->stimer_pending_bitmap);
 184                         stimers_pending++;
 185                 }
 186         }
 187         if (stimers_pending)
 188                 kvm_make_request(KVM_REQ_HV_STIMER, vcpu);
 189
 190         idx = srcu_read_lock(&kvm->irq_srcu);
 191         gsi = atomic_read(&synic->sint_to_gsi[sint]);
 192         if (gsi != -1)
 193                 kvm_notify_acked_gsi(kvm, gsi);
 194         srcu_read_unlock(&kvm->irq_srcu, idx);
 195 }
 196
 197 static void synic_exit(struct kvm_vcpu_hv_synic *synic, u32 msr)
 198 {
 199         struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
 200         struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv;
 201
 202         hv_vcpu->exit.type = KVM_EXIT_HYPERV_SYNIC;
 203         hv_vcpu->exit.u.synic.msr = msr;
 204         hv_vcpu->exit.u.synic.control = synic->control;
 205         hv_vcpu->exit.u.synic.evt_page = synic->evt_page;
 206         hv_vcpu->exit.u.synic.msg_page = synic->msg_page;
 207
 208         kvm_make_request(KVM_REQ_HV_EXIT, vcpu);
 209 }
 210
 211 static int synic_set_msr(struct kvm_vcpu_hv_synic *synic,
 212                          u32 msr, u64 data, bool host)
 213 {
 214         struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
 215         int ret;
 216
 217         if (!synic->active)
 218                 return 1;
 219
 220         trace_kvm_hv_synic_set_msr(vcpu->vcpu_id, msr, data, host);
 221
 222         ret = 0;
 223         switch (msr) {
 224         case HV_X64_MSR_SCONTROL:
 225                 synic->control = data;
 226                 if (!host)
 227                         synic_exit(synic, msr);
 228                 break;
 229         case HV_X64_MSR_SVERSION:
 230                 if (!host) {
 231                         ret = 1;
 232                         break;
 233                 }
 234                 synic->version = data;
 235                 break;
 236         case HV_X64_MSR_SIEFP:
 237                 if ((data & HV_SYNIC_SIEFP_ENABLE) && !host &&
 238                     !synic->dont_zero_synic_pages)
 239                         if (kvm_clear_guest(vcpu->kvm,
 240                                             data & PAGE_MASK, PAGE_SIZE)) {
 241                                 ret = 1;
 242                                 break;
 243                         }
 244                 synic->evt_page = data;
 245                 if (!host)
 246                         synic_exit(synic, msr);
 247                 break;
 248         case HV_X64_MSR_SIMP:
 249                 if ((data & HV_SYNIC_SIMP_ENABLE) && !host &&
 250                     !synic->dont_zero_synic_pages)
 251                         if (kvm_clear_guest(vcpu->kvm,
 252                                             data & PAGE_MASK, PAGE_SIZE)) {
 253                                 ret = 1;
 254                                 break;
 255                         }
 256                 synic->msg_page = data;
 257                 if (!host)
 258                         synic_exit(synic, msr);
 259                 break;
 260         case HV_X64_MSR_EOM: {
 261                 int i;
 262
 263                 for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
 264                         kvm_hv_notify_acked_sint(vcpu, i);
 265                 break;
 266         }
 267         case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
 268                 ret = synic_set_sint(synic, msr - HV_X64_MSR_SINT0, data, host);
 269                 break;
 270         default:
 271                 ret = 1;
 272                 break;
 273         }
 274         return ret;
 275 }
 276
 277 static int synic_get_msr(struct kvm_vcpu_hv_synic *synic, u32 msr, u64 *pdata)
 278 {
 279         int ret;
 280
 281         if (!synic->active)
 282                 return 1;
 283
 284         ret = 0;
 285         switch (msr) {
 286         case HV_X64_MSR_SCONTROL:
 287                 *pdata = synic->control;
 288                 break;
 289         case HV_X64_MSR_SVERSION:
 290                 *pdata = synic->version;
 291                 break;
 292         case HV_X64_MSR_SIEFP:
 293                 *pdata = synic->evt_page;
 294                 break;
 295         case HV_X64_MSR_SIMP:
 296                 *pdata = synic->msg_page;
 297                 break;
 298         case HV_X64_MSR_EOM:
 299                 *pdata = 0;
 300                 break;
 301         case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
 302                 *pdata = atomic64_read(&synic->sint[msr - HV_X64_MSR_SINT0]);
 303                 break;
 304         default:
 305                 ret = 1;
 306                 break;
 307         }
 308         return ret;
 309 }
 310
 311 static int synic_set_irq(struct kvm_vcpu_hv_synic *synic, u32 sint)
 312 {
 313         struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
 314         struct kvm_lapic_irq irq;
 315         int ret, vector;
 316
 317         if (sint >= ARRAY_SIZE(synic->sint))
 318                 return -EINVAL;
 319
 320         vector = synic_get_sint_vector(synic_read_sint(synic, sint));
 321         if (vector < 0)
 322                 return -ENOENT;
 323
 324         memset(&irq, 0, sizeof(irq));
 325         irq.shorthand = APIC_DEST_SELF;
 326         irq.dest_mode = APIC_DEST_PHYSICAL;
 327         irq.delivery_mode = APIC_DM_FIXED;
 328         irq.vector = vector;
 329         irq.level = 1;
 330
 331         ret = kvm_irq_delivery_to_apic(vcpu->kvm, vcpu->arch.apic, &irq, NULL);
 332         trace_kvm_hv_synic_set_irq(vcpu->vcpu_id, sint, irq.vector, ret);
 333         return ret;
 334 }
 335
 336 int kvm_hv_synic_set_irq(struct kvm *kvm, u32 vpidx, u32 sint)
 337 {
 338         struct kvm_vcpu_hv_synic *synic;
 339
 340         synic = synic_get(kvm, vpidx);
 341         if (!synic)
 342                 return -EINVAL;
 343
 344         return synic_set_irq(synic, sint);
 345 }
 346
 347 void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector)
 348 {
 349         struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
 350         int i;
 351
 352         trace_kvm_hv_synic_send_eoi(vcpu->vcpu_id, vector);
 353
 354         for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
 355                 if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector)
 356                         kvm_hv_notify_acked_sint(vcpu, i);
 357 }
 358
 359 static int kvm_hv_set_sint_gsi(struct kvm *kvm, u32 vpidx, u32 sint, int gsi)
 360 {
 361         struct kvm_vcpu_hv_synic *synic;
 362
 363         synic = synic_get(kvm, vpidx);
 364         if (!synic)
 365                 return -EINVAL;
 366
 367         if (sint >= ARRAY_SIZE(synic->sint_to_gsi))
 368                 return -EINVAL;
 369
 370         atomic_set(&synic->sint_to_gsi[sint], gsi);
 371         return 0;
 372 }
 373
 374 void kvm_hv_irq_routing_update(struct kvm *kvm)
 375 {
 376         struct kvm_irq_routing_table *irq_rt;
 377         struct kvm_kernel_irq_routing_entry *e;
 378         u32 gsi;
 379
 380         irq_rt = srcu_dereference_check(kvm->irq_routing, &kvm->irq_srcu,
 381                                         lockdep_is_held(&kvm->irq_lock));
 382
 383         for (gsi = 0; gsi < irq_rt->nr_rt_entries; gsi++) {
 384                 hlist_for_each_entry(e, &irq_rt->map[gsi], link) {
 385                         if (e->type == KVM_IRQ_ROUTING_HV_SINT)
 386                                 kvm_hv_set_sint_gsi(kvm, e->hv_sint.vcpu,
 387                                                     e->hv_sint.sint, gsi);
 388                 }
 389         }
 390 }
 391
 392 static void synic_init(struct kvm_vcpu_hv_synic *synic)
 393 {
 394         int i;
 395
 396         memset(synic, 0, sizeof(*synic));
 397         synic->version = HV_SYNIC_VERSION_1;
 398         for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
 399                 atomic64_set(&synic->sint[i], HV_SYNIC_SINT_MASKED);
 400                 atomic_set(&synic->sint_to_gsi[i], -1);
 401         }
 402 }
 403
 404 static u64 get_time_ref_counter(struct kvm *kvm)
 405 {
 406         struct kvm_hv *hv = &kvm->arch.hyperv;
 407         struct kvm_vcpu *vcpu;
 408         u64 tsc;
 409
 410         /*
 411          * The guest has not set up the TSC page or the clock isn't
 412          * stable, fall back to get_kvmclock_ns.
 413          */
 414         if (!hv->tsc_ref.tsc_sequence)
 415                 return div_u64(get_kvmclock_ns(kvm), 100);
 416
 417         vcpu = kvm_get_vcpu(kvm, 0);
 418         tsc = kvm_read_l1_tsc(vcpu, rdtsc());
 419         return mul_u64_u64_shr(tsc, hv->tsc_ref.tsc_scale, 64)
 420                 + hv->tsc_ref.tsc_offset;
 421 }
 422
 423 static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer,
 424                                 bool vcpu_kick)
 425 {
 426         struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
 427
 428         set_bit(stimer->index,
 429                 vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap);
 430         kvm_make_request(KVM_REQ_HV_STIMER, vcpu);
 431         if (vcpu_kick)
 432                 kvm_vcpu_kick(vcpu);
 433 }
 434
 435 static void stimer_cleanup(struct kvm_vcpu_hv_stimer *stimer)
 436 {
 437         struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
 438
 439         trace_kvm_hv_stimer_cleanup(stimer_to_vcpu(stimer)->vcpu_id,
 440                                     stimer->index);
 441
 442         hrtimer_cancel(&stimer->timer);
 443         clear_bit(stimer->index,
 444                   vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap);
 445         stimer->msg_pending = false;
 446         stimer->exp_time = 0;
 447 }
 448
 449 static enum hrtimer_restart stimer_timer_callback(struct hrtimer *timer)
 450 {
 451         struct kvm_vcpu_hv_stimer *stimer;
 452
 453         stimer = container_of(timer, struct kvm_vcpu_hv_stimer, timer);
 454         trace_kvm_hv_stimer_callback(stimer_to_vcpu(stimer)->vcpu_id,
 455                                      stimer->index);
 456         stimer_mark_pending(stimer, true);
 457
 458         return HRTIMER_NORESTART;
 459 }
 460
 461 /*
 462  * stimer_start() assumptions:
 463  * a) stimer->count is not equal to 0
 464  * b) stimer->config has HV_STIMER_ENABLE flag
 465  */
 466 static int stimer_start(struct kvm_vcpu_hv_stimer *stimer)
 467 {
 468         u64 time_now;
 469         ktime_t ktime_now;
 470
 471         time_now = get_time_ref_counter(stimer_to_vcpu(stimer)->kvm);
 472         ktime_now = ktime_get();
 473
 474         if (stimer->config & HV_STIMER_PERIODIC) {
 475                 if (stimer->exp_time) {
 476                         if (time_now >= stimer->exp_time) {
 477                                 u64 remainder;
 478
 479                                 div64_u64_rem(time_now - stimer->exp_time,
 480                                               stimer->count, &remainder);
 481                                 stimer->exp_time =
 482                                         time_now + (stimer->count - remainder);
 483                         }
 484                 } else
 485                         stimer->exp_time = time_now + stimer->count;
 486
 487                 trace_kvm_hv_stimer_start_periodic(
 488                                         stimer_to_vcpu(stimer)->vcpu_id,
 489                                         stimer->index,
 490                                         time_now, stimer->exp_time);
 491
 492                 hrtimer_start(&stimer->timer,
 493                               ktime_add_ns(ktime_now,
 494                                            100 * (stimer->exp_time - time_now)),
 495                               HRTIMER_MODE_ABS);
 496                 return 0;
 497         }
 498         stimer->exp_time = stimer->count;
 499         if (time_now >= stimer->count) {
 500                 /*
 501                  * Expire timer according to Hypervisor Top-Level Functional
 502                  * specification v4(15.3.1):
 503                  * "If a one shot is enabled and the specified count is in
 504                  * the past, it will expire immediately."
 505                  */
 506                 stimer_mark_pending(stimer, false);
 507                 return 0;
 508         }
 509
 510         trace_kvm_hv_stimer_start_one_shot(stimer_to_vcpu(stimer)->vcpu_id,
 511                                            stimer->index,
 512                                            time_now, stimer->count);
 513
 514         hrtimer_start(&stimer->timer,
 515                       ktime_add_ns(ktime_now, 100 * (stimer->count - time_now)),
 516                       HRTIMER_MODE_ABS);
 517         return 0;
 518 }
 519
 520 static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config,
 521                              bool host)
 522 {
 523         trace_kvm_hv_stimer_set_config(stimer_to_vcpu(stimer)->vcpu_id,
 524                                        stimer->index, config, host);
 525
 526         stimer_cleanup(stimer);
 527         if ((stimer->config & HV_STIMER_ENABLE) && HV_STIMER_SINT(config) == 0)
 528                 config &= ~HV_STIMER_ENABLE;
 529         stimer->config = config;
 530         stimer_mark_pending(stimer, false);
 531         return 0;
 532 }
 533
 534 static int stimer_set_count(struct kvm_vcpu_hv_stimer *stimer, u64 count,
 535                             bool host)
 536 {
 537         trace_kvm_hv_stimer_set_count(stimer_to_vcpu(stimer)->vcpu_id,
 538                                       stimer->index, count, host);
 539
 540         stimer_cleanup(stimer);
 541         stimer->count = count;
 542         if (stimer->count == 0)
 543                 stimer->config &= ~HV_STIMER_ENABLE;
 544         else if (stimer->config & HV_STIMER_AUTOENABLE)
 545                 stimer->config |= HV_STIMER_ENABLE;
 546         stimer_mark_pending(stimer, false);
 547         return 0;
 548 }
 549
 550 static int stimer_get_config(struct kvm_vcpu_hv_stimer *stimer, u64 *pconfig)
 551 {
 552         *pconfig = stimer->config;
 553         return 0;
 554 }
 555
 556 static int stimer_get_count(struct kvm_vcpu_hv_stimer *stimer, u64 *pcount)
 557 {
 558         *pcount = stimer->count;
 559         return 0;
 560 }
 561
 562 static int synic_deliver_msg(struct kvm_vcpu_hv_synic *synic, u32 sint,
 563                              struct hv_message *src_msg)
 564 {
 565         struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
 566         struct page *page;
 567         gpa_t gpa;
 568         struct hv_message *dst_msg;
 569         int r;
 570         struct hv_message_page *msg_page;
 571
 572         if (!(synic->msg_page & HV_SYNIC_SIMP_ENABLE))
 573                 return -ENOENT;
 574
 575         gpa = synic->msg_page & PAGE_MASK;
 576         page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT);
 577         if (is_error_page(page))
 578                 return -EFAULT;
 579
 580         msg_page = kmap_atomic(page);
 581         dst_msg = &msg_page->sint_message[sint];
 582         if (sync_cmpxchg(&dst_msg->header.message_type, HVMSG_NONE,
 583                          src_msg->header.message_type) != HVMSG_NONE) {
 584                 dst_msg->header.message_flags.msg_pending = 1;
 585                 r = -EAGAIN;
 586         } else {
 587                 memcpy(&dst_msg->u.payload, &src_msg->u.payload,
 588                        src_msg->header.payload_size);
 589                 dst_msg->header.message_type = src_msg->header.message_type;
 590                 dst_msg->header.payload_size = src_msg->header.payload_size;
 591                 r = synic_set_irq(synic, sint);
 592                 if (r >= 1)
 593                         r = 0;
 594                 else if (r == 0)
 595                         r = -EFAULT;
 596         }
 597         kunmap_atomic(msg_page);
 598         kvm_release_page_dirty(page);
 599         kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT);
 600         return r;
 601 }
 602
 603 static int stimer_send_msg(struct kvm_vcpu_hv_stimer *stimer)
 604 {
 605         struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
 606         struct hv_message *msg = &stimer->msg;
 607         struct hv_timer_message_payload *payload =
 608                         (struct hv_timer_message_payload *)&msg->u.payload;
 609
 610         payload->expiration_time = stimer->exp_time;
 611         payload->delivery_time = get_time_ref_counter(vcpu->kvm);
 612         return synic_deliver_msg(vcpu_to_synic(vcpu),
 613                                  HV_STIMER_SINT(stimer->config), msg);
 614 }
 615
 616 static void stimer_expiration(struct kvm_vcpu_hv_stimer *stimer)
 617 {
 618         int r;
 619
 620         stimer->msg_pending = true;
 621         r = stimer_send_msg(stimer);
 622         trace_kvm_hv_stimer_expiration(stimer_to_vcpu(stimer)->vcpu_id,
 623                                        stimer->index, r);
 624         if (!r) {
 625                 stimer->msg_pending = false;
 626                 if (!(stimer->config & HV_STIMER_PERIODIC))
 627                         stimer->config &= ~HV_STIMER_ENABLE;
 628         }
 629 }
 630
 631 void kvm_hv_process_stimers(struct kvm_vcpu *vcpu)
 632 {
 633         struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
 634         struct kvm_vcpu_hv_stimer *stimer;
 635         u64 time_now, exp_time;
 636         int i;
 637
 638         for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
 639                 if (test_and_clear_bit(i, hv_vcpu->stimer_pending_bitmap)) {
 640                         stimer = &hv_vcpu->stimer[i];
 641                         if (stimer->config & HV_STIMER_ENABLE) {
 642                                 exp_time = stimer->exp_time;
 643
 644                                 if (exp_time) {
 645                                         time_now =
 646                                                 get_time_ref_counter(vcpu->kvm);
 647                                         if (time_now >= exp_time)
 648                                                 stimer_expiration(stimer);
 649                                 }
 650
 651                                 if ((stimer->config & HV_STIMER_ENABLE) &&
 652                                     stimer->count)
 653                                         stimer_start(stimer);
 654                                 else
 655                                         stimer_cleanup(stimer);
 656                         }
 657                 }
 658 }
 659
 660 void kvm_hv_vcpu_uninit(struct kvm_vcpu *vcpu)
 661 {
 662         struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
 663         int i;
 664
 665         for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
 666                 stimer_cleanup(&hv_vcpu->stimer[i]);
 667 }
 668
 669 static void stimer_prepare_msg(struct kvm_vcpu_hv_stimer *stimer)
 670 {
 671         struct hv_message *msg = &stimer->msg;
 672         struct hv_timer_message_payload *payload =
 673                         (struct hv_timer_message_payload *)&msg->u.payload;
 674
 675         memset(&msg->header, 0, sizeof(msg->header));
 676         msg->header.message_type = HVMSG_TIMER_EXPIRED;
 677         msg->header.payload_size = sizeof(*payload);
 678
 679         payload->timer_index = stimer->index;
 680         payload->expiration_time = 0;
 681         payload->delivery_time = 0;
 682 }
 683
 684 static void stimer_init(struct kvm_vcpu_hv_stimer *stimer, int timer_index)
 685 {
 686         memset(stimer, 0, sizeof(*stimer));
 687         stimer->index = timer_index;
 688         hrtimer_init(&stimer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
 689         stimer->timer.function = stimer_timer_callback;
 690         stimer_prepare_msg(stimer);
 691 }
 692
 693 void kvm_hv_vcpu_init(struct kvm_vcpu *vcpu)
 694 {
 695         struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
 696         int i;
 697
 698         synic_init(&hv_vcpu->synic);
 699
 700         bitmap_zero(hv_vcpu->stimer_pending_bitmap, HV_SYNIC_STIMER_COUNT);
 701         for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
 702                 stimer_init(&hv_vcpu->stimer[i], i);
 703 }
 704
 705 void kvm_hv_vcpu_postcreate(struct kvm_vcpu *vcpu)
 706 {
 707         struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
 708
 709         hv_vcpu->vp_index = kvm_vcpu_get_idx(vcpu);
 710 }
 711
 712 int kvm_hv_activate_synic(struct kvm_vcpu *vcpu, bool dont_zero_synic_pages)
 713 {
 714         struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
 715
 716         /*
 717          * Hyper-V SynIC auto EOI SINT's are
 718          * not compatible with APICV, so deactivate APICV
 719          */
 720         kvm_vcpu_deactivate_apicv(vcpu);
 721         synic->active = true;
 722         synic->dont_zero_synic_pages = dont_zero_synic_pages;
 723         return 0;
 724 }
 725
 726 static bool kvm_hv_msr_partition_wide(u32 msr)
 727 {
 728         bool r = false;
 729
 730         switch (msr) {
 731         case HV_X64_MSR_GUEST_OS_ID:
 732         case HV_X64_MSR_HYPERCALL:
 733         case HV_X64_MSR_REFERENCE_TSC:
 734         case HV_X64_MSR_TIME_REF_COUNT:
 735         case HV_X64_MSR_CRASH_CTL:
 736         case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
 737         case HV_X64_MSR_RESET:
 738                 r = true;
 739                 break;
 740         }
 741
 742         return r;
 743 }
 744
 745 static int kvm_hv_msr_get_crash_data(struct kvm_vcpu *vcpu,
 746                                      u32 index, u64 *pdata)
 747 {
 748         struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
 749
 750         if (WARN_ON_ONCE(index >= ARRAY_SIZE(hv->hv_crash_param)))
 751                 return -EINVAL;
 752
 753         *pdata = hv->hv_crash_param[index];
 754         return 0;
 755 }
 756
 757 static int kvm_hv_msr_get_crash_ctl(struct kvm_vcpu *vcpu, u64 *pdata)
 758 {
 759         struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
 760
 761         *pdata = hv->hv_crash_ctl;
 762         return 0;
 763 }
 764
 765 static int kvm_hv_msr_set_crash_ctl(struct kvm_vcpu *vcpu, u64 data, bool host)
 766 {
 767         struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
 768
 769         if (host)
 770                 hv->hv_crash_ctl = data & HV_X64_MSR_CRASH_CTL_NOTIFY;
 771
 772         if (!host && (data & HV_X64_MSR_CRASH_CTL_NOTIFY)) {
 773
 774                 vcpu_debug(vcpu, "hv crash (0x%llx 0x%llx 0x%llx 0x%llx 0x%llx)\n",
 775                           hv->hv_crash_param[0],
 776                           hv->hv_crash_param[1],
 777                           hv->hv_crash_param[2],
 778                           hv->hv_crash_param[3],
 779                           hv->hv_crash_param[4]);
 780
 781                 /* Send notification about crash to user space */
 782                 kvm_make_request(KVM_REQ_HV_CRASH, vcpu);
 783         }
 784
 785         return 0;
 786 }
 787
 788 static int kvm_hv_msr_set_crash_data(struct kvm_vcpu *vcpu,
 789                                      u32 index, u64 data)
 790 {
 791         struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
 792
 793         if (WARN_ON_ONCE(index >= ARRAY_SIZE(hv->hv_crash_param)))
 794                 return -EINVAL;
 795
 796         hv->hv_crash_param[index] = data;
 797         return 0;
 798 }
 799
 800 /*
 801  * The kvmclock and Hyper-V TSC page use similar formulas, and converting
 802  * between them is possible:
 803  *
 804  * kvmclock formula:
 805  *    nsec = (ticks - tsc_timestamp) * tsc_to_system_mul * 2^(tsc_shift-32)
 806  *           + system_time
 807  *
 808  * Hyper-V formula:
 809  *    nsec/100 = ticks * scale / 2^64 + offset
 810  *
 811  * When tsc_timestamp = system_time = 0, offset is zero in the Hyper-V formula.
 812  * By dividing the kvmclock formula by 100 and equating what's left we get:
 813  *    ticks * scale / 2^64 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100
 814  *            scale / 2^64 =         tsc_to_system_mul * 2^(tsc_shift-32) / 100
 815  *            scale        =         tsc_to_system_mul * 2^(32+tsc_shift) / 100
 816  *
 817  * Now expand the kvmclock formula and divide by 100:
 818  *    nsec = ticks * tsc_to_system_mul * 2^(tsc_shift-32)
 819  *           - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32)
 820  *           + system_time
 821  *    nsec/100 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100
 822  *               - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32) / 100
 823  *               + system_time / 100
 824  *
 825  * Replace tsc_to_system_mul * 2^(tsc_shift-32) / 100 by scale / 2^64:
 826  *    nsec/100 = ticks * scale / 2^64
 827  *               - tsc_timestamp * scale / 2^64
 828  *               + system_time / 100
 829  *
 830  * Equate with the Hyper-V formula so that ticks * scale / 2^64 cancels out:
 831  *    offset = system_time / 100 - tsc_timestamp * scale / 2^64
 832  *
 833  * These two equivalencies are implemented in this function.
 834  */
 835 static bool compute_tsc_page_parameters(struct pvclock_vcpu_time_info *hv_clock,
 836                                         HV_REFERENCE_TSC_PAGE *tsc_ref)
 837 {
 838         u64 max_mul;
 839
 840         if (!(hv_clock->flags & PVCLOCK_TSC_STABLE_BIT))
 841                 return false;
 842
 843         /*
 844          * check if scale would overflow, if so we use the time ref counter
 845          *    tsc_to_system_mul * 2^(tsc_shift+32) / 100 >= 2^64
 846          *    tsc_to_system_mul / 100 >= 2^(32-tsc_shift)
 847          *    tsc_to_system_mul >= 100 * 2^(32-tsc_shift)
 848          */
 849         max_mul = 100ull << (32 - hv_clock->tsc_shift);
 850         if (hv_clock->tsc_to_system_mul >= max_mul)
 851                 return false;
 852
 853         /*
 854          * Otherwise compute the scale and offset according to the formulas
 855          * derived above.
 856          */
 857         tsc_ref->tsc_scale =
 858                 mul_u64_u32_div(1ULL << (32 + hv_clock->tsc_shift),
 859                                 hv_clock->tsc_to_system_mul,
 860                                 100);
 861
 862         tsc_ref->tsc_offset = hv_clock->system_time;
 863         do_div(tsc_ref->tsc_offset, 100);
 864         tsc_ref->tsc_offset -=
 865                 mul_u64_u64_shr(hv_clock->tsc_timestamp, tsc_ref->tsc_scale, 64);
 866         return true;
 867 }
 868
 869 void kvm_hv_setup_tsc_page(struct kvm *kvm,
 870                            struct pvclock_vcpu_time_info *hv_clock)
 871 {
 872         struct kvm_hv *hv = &kvm->arch.hyperv;
 873         u32 tsc_seq;
 874         u64 gfn;
 875
 876         BUILD_BUG_ON(sizeof(tsc_seq) != sizeof(hv->tsc_ref.tsc_sequence));
 877         BUILD_BUG_ON(offsetof(HV_REFERENCE_TSC_PAGE, tsc_sequence) != 0);
 878
 879         if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE))
 880                 return;
 881
 882         mutex_lock(&kvm->arch.hyperv.hv_lock);
 883         if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE))
 884                 goto out_unlock;
 885
 886         gfn = hv->hv_tsc_page >> HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT;
 887         /*
 888          * Because the TSC parameters only vary when there is a
 889          * change in the master clock, do not bother with caching.
 890          */
 891         if (unlikely(kvm_read_guest(kvm, gfn_to_gpa(gfn),
 892                                     &tsc_seq, sizeof(tsc_seq))))
 893                 goto out_unlock;
 894
 895         /*
 896          * While we're computing and writing the parameters, force the
 897          * guest to use the time reference count MSR.
 898          */
 899         hv->tsc_ref.tsc_sequence = 0;
 900         if (kvm_write_guest(kvm, gfn_to_gpa(gfn),
 901                             &hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence)))
 902                 goto out_unlock;
 903
 904         if (!compute_tsc_page_parameters(hv_clock, &hv->tsc_ref))
 905                 goto out_unlock;
 906
 907         /* Ensure sequence is zero before writing the rest of the struct.  */
 908         smp_wmb();
 909         if (kvm_write_guest(kvm, gfn_to_gpa(gfn), &hv->tsc_ref, sizeof(hv->tsc_ref)))
 910                 goto out_unlock;
 911
 912         /*
 913          * Now switch to the TSC page mechanism by writing the sequence.
 914          */
 915         tsc_seq++;
 916         if (tsc_seq == 0xFFFFFFFF || tsc_seq == 0)
 917                 tsc_seq = 1;
 918
 919         /* Write the struct entirely before the non-zero sequence.  */
 920         smp_wmb();
 921
 922         hv->tsc_ref.tsc_sequence = tsc_seq;
 923         kvm_write_guest(kvm, gfn_to_gpa(gfn),
 924                         &hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence));
 925 out_unlock:
 926         mutex_unlock(&kvm->arch.hyperv.hv_lock);
 927 }
 928
 929 static int kvm_hv_set_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data,
 930                              bool host)
 931 {
 932         struct kvm *kvm = vcpu->kvm;
 933         struct kvm_hv *hv = &kvm->arch.hyperv;
 934
 935         switch (msr) {
 936         case HV_X64_MSR_GUEST_OS_ID:
 937                 hv->hv_guest_os_id = data;
 938                 /* setting guest os id to zero disables hypercall page */
 939                 if (!hv->hv_guest_os_id)
 940                         hv->hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE;
 941                 break;
 942         case HV_X64_MSR_HYPERCALL: {
 943                 u64 gfn;
 944                 unsigned long addr;
 945                 u8 instructions[4];
 946
 947                 /* if guest os id is not set hypercall should remain disabled */
 948                 if (!hv->hv_guest_os_id)
 949                         break;
 950                 if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) {
 951                         hv->hv_hypercall = data;
 952                         break;
 953                 }
 954                 gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT;
 955                 addr = gfn_to_hva(kvm, gfn);
 956                 if (kvm_is_error_hva(addr))
 957                         return 1;
 958                 kvm_x86_ops->patch_hypercall(vcpu, instructions);
 959                 ((unsigned char *)instructions)[3] = 0xc3; /* ret */
 960                 if (__copy_to_user((void __user *)addr, instructions, 4))
 961                         return 1;
 962                 hv->hv_hypercall = data;
 963                 mark_page_dirty(kvm, gfn);
 964                 break;
 965         }
 966         case HV_X64_MSR_REFERENCE_TSC:
 967                 hv->hv_tsc_page = data;
 968                 if (hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE)
 969                         kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
 970                 break;
 971         case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
 972                 return kvm_hv_msr_set_crash_data(vcpu,
 973                                                  msr - HV_X64_MSR_CRASH_P0,
 974                                                  data);
 975         case HV_X64_MSR_CRASH_CTL:
 976                 return kvm_hv_msr_set_crash_ctl(vcpu, data, host);
 977         case HV_X64_MSR_RESET:
 978                 if (data == 1) {
 979                         vcpu_debug(vcpu, "hyper-v reset requested\n");
 980                         kvm_make_request(KVM_REQ_HV_RESET, vcpu);
 981                 }
 982                 break;
 983         default:
 984                 vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
 985                             msr, data);
 986                 return 1;
 987         }
 988         return 0;
 989 }
 990
 991 /* Calculate cpu time spent by current task in 100ns units */
 992 static u64 current_task_runtime_100ns(void)
 993 {
 994         u64 utime, stime;
 995
 996         task_cputime_adjusted(current, &utime, &stime);
 997
 998         return div_u64(utime + stime, 100);
 999 }
1000
1001 static int kvm_hv_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
1002 {
1003         struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv;
1004
1005         switch (msr) {
1006         case HV_X64_MSR_VP_INDEX:
1007                 if (!host)
1008                         return 1;
1009                 hv->vp_index = (u32)data;
1010                 break;
1011         case HV_X64_MSR_APIC_ASSIST_PAGE: {
1012                 u64 gfn;
1013                 unsigned long addr;
1014
1015                 if (!(data & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE)) {
1016                         hv->hv_vapic = data;
1017                         if (kvm_lapic_enable_pv_eoi(vcpu, 0))
1018                                 return 1;
1019                         break;
1020                 }
1021                 gfn = data >> HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT;
1022                 addr = kvm_vcpu_gfn_to_hva(vcpu, gfn);
1023                 if (kvm_is_error_hva(addr))
1024                         return 1;
1025                 if (__clear_user((void __user *)addr, PAGE_SIZE))
1026                         return 1;
1027                 hv->hv_vapic = data;
1028                 kvm_vcpu_mark_page_dirty(vcpu, gfn);
1029                 if (kvm_lapic_enable_pv_eoi(vcpu,
1030                                             gfn_to_gpa(gfn) | KVM_MSR_ENABLED))
1031                         return 1;
1032                 break;
1033         }
1034         case HV_X64_MSR_EOI:
1035                 return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data);
1036         case HV_X64_MSR_ICR:
1037                 return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data);
1038         case HV_X64_MSR_TPR:
1039                 return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data);
1040         case HV_X64_MSR_VP_RUNTIME:
1041                 if (!host)
1042                         return 1;
1043                 hv->runtime_offset = data - current_task_runtime_100ns();
1044                 break;
1045         case HV_X64_MSR_SCONTROL:
1046         case HV_X64_MSR_SVERSION:
1047         case HV_X64_MSR_SIEFP:
1048         case HV_X64_MSR_SIMP:
1049         case HV_X64_MSR_EOM:
1050         case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
1051                 return synic_set_msr(vcpu_to_synic(vcpu), msr, data, host);
1052         case HV_X64_MSR_STIMER0_CONFIG:
1053         case HV_X64_MSR_STIMER1_CONFIG:
1054         case HV_X64_MSR_STIMER2_CONFIG:
1055         case HV_X64_MSR_STIMER3_CONFIG: {
1056                 int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2;
1057
1058                 return stimer_set_config(vcpu_to_stimer(vcpu, timer_index),
1059                                          data, host);
1060         }
1061         case HV_X64_MSR_STIMER0_COUNT:
1062         case HV_X64_MSR_STIMER1_COUNT:
1063         case HV_X64_MSR_STIMER2_COUNT:
1064         case HV_X64_MSR_STIMER3_COUNT: {
1065                 int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2;
1066
1067                 return stimer_set_count(vcpu_to_stimer(vcpu, timer_index),
1068                                         data, host);
1069         }
1070         default:
1071                 vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
1072                             msr, data);
1073                 return 1;
1074         }
1075
1076         return 0;
1077 }
1078
1079 static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1080 {
1081         u64 data = 0;
1082         struct kvm *kvm = vcpu->kvm;
1083         struct kvm_hv *hv = &kvm->arch.hyperv;
1084
1085         switch (msr) {
1086         case HV_X64_MSR_GUEST_OS_ID:
1087                 data = hv->hv_guest_os_id;
1088                 break;
1089         case HV_X64_MSR_HYPERCALL:
1090                 data = hv->hv_hypercall;
1091                 break;
1092         case HV_X64_MSR_TIME_REF_COUNT:
1093                 data = get_time_ref_counter(kvm);
1094                 break;
1095         case HV_X64_MSR_REFERENCE_TSC:
1096                 data = hv->hv_tsc_page;
1097                 break;
1098         case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
1099                 return kvm_hv_msr_get_crash_data(vcpu,
1100                                                  msr - HV_X64_MSR_CRASH_P0,
1101                                                  pdata);
1102         case HV_X64_MSR_CRASH_CTL:
1103                 return kvm_hv_msr_get_crash_ctl(vcpu, pdata);
1104         case HV_X64_MSR_RESET:
1105                 data = 0;
1106                 break;
1107         default:
1108                 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1109                 return 1;
1110         }
1111
1112         *pdata = data;
1113         return 0;
1114 }
1115
1116 static int kvm_hv_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1117 {
1118         u64 data = 0;
1119         struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv;
1120
1121         switch (msr) {
1122         case HV_X64_MSR_VP_INDEX:
1123                 data = hv->vp_index;
1124                 break;
1125         case HV_X64_MSR_EOI:
1126                 return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata);
1127         case HV_X64_MSR_ICR:
1128                 return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata);
1129         case HV_X64_MSR_TPR:
1130                 return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata);
1131         case HV_X64_MSR_APIC_ASSIST_PAGE:
1132                 data = hv->hv_vapic;
1133                 break;
1134         case HV_X64_MSR_VP_RUNTIME:
1135                 data = current_task_runtime_100ns() + hv->runtime_offset;
1136                 break;
1137         case HV_X64_MSR_SCONTROL:
1138         case HV_X64_MSR_SVERSION:
1139         case HV_X64_MSR_SIEFP:
1140         case HV_X64_MSR_SIMP:
1141         case HV_X64_MSR_EOM:
1142         case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
1143                 return synic_get_msr(vcpu_to_synic(vcpu), msr, pdata);
1144         case HV_X64_MSR_STIMER0_CONFIG:
1145         case HV_X64_MSR_STIMER1_CONFIG:
1146         case HV_X64_MSR_STIMER2_CONFIG:
1147         case HV_X64_MSR_STIMER3_CONFIG: {
1148                 int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2;
1149
1150                 return stimer_get_config(vcpu_to_stimer(vcpu, timer_index),
1151                                          pdata);
1152         }
1153         case HV_X64_MSR_STIMER0_COUNT:
1154         case HV_X64_MSR_STIMER1_COUNT:
1155         case HV_X64_MSR_STIMER2_COUNT:
1156         case HV_X64_MSR_STIMER3_COUNT: {
1157                 int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2;
1158
1159                 return stimer_get_count(vcpu_to_stimer(vcpu, timer_index),
1160                                         pdata);
1161         }
1162         default:
1163                 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1164                 return 1;
1165         }
1166         *pdata = data;
1167         return 0;
1168 }
1169
1170 int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
1171 {
1172         if (kvm_hv_msr_partition_wide(msr)) {
1173                 int r;
1174
1175                 mutex_lock(&vcpu->kvm->arch.hyperv.hv_lock);
1176                 r = kvm_hv_set_msr_pw(vcpu, msr, data, host);
1177                 mutex_unlock(&vcpu->kvm->arch.hyperv.hv_lock);
1178                 return r;
1179         } else
1180                 return kvm_hv_set_msr(vcpu, msr, data, host);
1181 }
1182
1183 int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1184 {
1185         if (kvm_hv_msr_partition_wide(msr)) {
1186                 int r;
1187
1188                 mutex_lock(&vcpu->kvm->arch.hyperv.hv_lock);
1189                 r = kvm_hv_get_msr_pw(vcpu, msr, pdata);
1190                 mutex_unlock(&vcpu->kvm->arch.hyperv.hv_lock);
1191                 return r;
1192         } else
1193                 return kvm_hv_get_msr(vcpu, msr, pdata);
1194 }
1195
1196 bool kvm_hv_hypercall_enabled(struct kvm *kvm)
1197 {
1198         return READ_ONCE(kvm->arch.hyperv.hv_hypercall) & HV_X64_MSR_HYPERCALL_ENABLE;
1199 }
1200
1201 static void kvm_hv_hypercall_set_result(struct kvm_vcpu *vcpu, u64 result)
1202 {
1203         bool longmode;
1204
1205         longmode = is_64_bit_mode(vcpu);
1206         if (longmode)
1207                 kvm_register_write(vcpu, VCPU_REGS_RAX, result);
1208         else {
1209                 kvm_register_write(vcpu, VCPU_REGS_RDX, result >> 32);
1210                 kvm_register_write(vcpu, VCPU_REGS_RAX, result & 0xffffffff);
1211         }
1212 }
1213
1214 static int kvm_hv_hypercall_complete_userspace(struct kvm_vcpu *vcpu)
1215 {
1216         struct kvm_run *run = vcpu->run;
1217
1218         kvm_hv_hypercall_set_result(vcpu, run->hyperv.u.hcall.result);
1219         return 1;
1220 }
1221
1222 int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
1223 {
1224         u64 param, ingpa, outgpa, ret;
1225         uint16_t code, rep_idx, rep_cnt, res = HV_STATUS_SUCCESS, rep_done = 0;
1226         bool fast, longmode;
1227
1228         /*
1229          * hypercall generates UD from non zero cpl and real mode
1230          * per HYPER-V spec
1231          */
1232         if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) {
1233                 kvm_queue_exception(vcpu, UD_VECTOR);
1234                 return 1;
1235         }
1236
1237         longmode = is_64_bit_mode(vcpu);
1238
1239         if (!longmode) {
1240                 param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) |
1241                         (kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff);
1242                 ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) |
1243                         (kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff);
1244                 outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) |
1245                         (kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff);
1246         }
1247 #ifdef CONFIG_X86_64
1248         else {
1249                 param = kvm_register_read(vcpu, VCPU_REGS_RCX);
1250                 ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX);
1251                 outgpa = kvm_register_read(vcpu, VCPU_REGS_R8);
1252         }
1253 #endif
1254
1255         code = param & 0xffff;
1256         fast = (param >> 16) & 0x1;
1257         rep_cnt = (param >> 32) & 0xfff;
1258         rep_idx = (param >> 48) & 0xfff;
1259
1260         trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa);
1261
1262         /* Hypercall continuation is not supported yet */
1263         if (rep_cnt || rep_idx) {
1264                 res = HV_STATUS_INVALID_HYPERCALL_CODE;
1265                 goto set_result;
1266         }
1267
1268         switch (code) {
1269         case HVCALL_NOTIFY_LONG_SPIN_WAIT:
1270                 kvm_vcpu_on_spin(vcpu);
1271                 break;
1272         case HVCALL_POST_MESSAGE:
1273         case HVCALL_SIGNAL_EVENT:
1274                 /* don't bother userspace if it has no way to handle it */
1275                 if (!vcpu_to_synic(vcpu)->active) {
1276                         res = HV_STATUS_INVALID_HYPERCALL_CODE;
1277                         break;
1278                 }
1279                 vcpu->run->exit_reason = KVM_EXIT_HYPERV;
1280                 vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL;
1281                 vcpu->run->hyperv.u.hcall.input = param;
1282                 vcpu->run->hyperv.u.hcall.params[0] = ingpa;
1283                 vcpu->run->hyperv.u.hcall.params[1] = outgpa;
1284                 vcpu->arch.complete_userspace_io =
1285                                 kvm_hv_hypercall_complete_userspace;
1286                 return 0;
1287         default:
1288                 res = HV_STATUS_INVALID_HYPERCALL_CODE;
1289                 break;
1290         }
1291
1292 set_result:
1293         ret = res | (((u64)rep_done & 0xfff) << 32);
1294         kvm_hv_hypercall_set_result(vcpu, ret);
1295         return 1;
1296 }