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                                         if (!stimer->msg_pending)
 654                                                 stimer_start(stimer);
 655                                 } else
 656                                         stimer_cleanup(stimer);
 657                         }
 658                 }
 659 }
 660
 661 void kvm_hv_vcpu_uninit(struct kvm_vcpu *vcpu)
 662 {
 663         struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
 664         int i;
 665
 666         for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
 667                 stimer_cleanup(&hv_vcpu->stimer[i]);
 668 }
 669
 670 static void stimer_prepare_msg(struct kvm_vcpu_hv_stimer *stimer)
 671 {
 672         struct hv_message *msg = &stimer->msg;
 673         struct hv_timer_message_payload *payload =
 674                         (struct hv_timer_message_payload *)&msg->u.payload;
 675
 676         memset(&msg->header, 0, sizeof(msg->header));
 677         msg->header.message_type = HVMSG_TIMER_EXPIRED;
 678         msg->header.payload_size = sizeof(*payload);
 679
 680         payload->timer_index = stimer->index;
 681         payload->expiration_time = 0;
 682         payload->delivery_time = 0;
 683 }
 684
 685 static void stimer_init(struct kvm_vcpu_hv_stimer *stimer, int timer_index)
 686 {
 687         memset(stimer, 0, sizeof(*stimer));
 688         stimer->index = timer_index;
 689         hrtimer_init(&stimer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
 690         stimer->timer.function = stimer_timer_callback;
 691         stimer_prepare_msg(stimer);
 692 }
 693
 694 void kvm_hv_vcpu_init(struct kvm_vcpu *vcpu)
 695 {
 696         struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
 697         int i;
 698
 699         synic_init(&hv_vcpu->synic);
 700
 701         bitmap_zero(hv_vcpu->stimer_pending_bitmap, HV_SYNIC_STIMER_COUNT);
 702         for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
 703                 stimer_init(&hv_vcpu->stimer[i], i);
 704 }
 705
 706 void kvm_hv_vcpu_postcreate(struct kvm_vcpu *vcpu)
 707 {
 708         struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
 709
 710         hv_vcpu->vp_index = kvm_vcpu_get_idx(vcpu);
 711 }
 712
 713 int kvm_hv_activate_synic(struct kvm_vcpu *vcpu, bool dont_zero_synic_pages)
 714 {
 715         struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
 716
 717         /*
 718          * Hyper-V SynIC auto EOI SINT's are
 719          * not compatible with APICV, so deactivate APICV
 720          */
 721         kvm_vcpu_deactivate_apicv(vcpu);
 722         synic->active = true;
 723         synic->dont_zero_synic_pages = dont_zero_synic_pages;
 724         return 0;
 725 }
 726
 727 static bool kvm_hv_msr_partition_wide(u32 msr)
 728 {
 729         bool r = false;
 730
 731         switch (msr) {
 732         case HV_X64_MSR_GUEST_OS_ID:
 733         case HV_X64_MSR_HYPERCALL:
 734         case HV_X64_MSR_REFERENCE_TSC:
 735         case HV_X64_MSR_TIME_REF_COUNT:
 736         case HV_X64_MSR_CRASH_CTL:
 737         case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
 738         case HV_X64_MSR_RESET:
 739                 r = true;
 740                 break;
 741         }
 742
 743         return r;
 744 }
 745
 746 static int kvm_hv_msr_get_crash_data(struct kvm_vcpu *vcpu,
 747                                      u32 index, u64 *pdata)
 748 {
 749         struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
 750         size_t size = ARRAY_SIZE(hv->hv_crash_param);
 751
 752         if (WARN_ON_ONCE(index >= size))
 753                 return -EINVAL;
 754
 755         *pdata = hv->hv_crash_param[array_index_nospec(index, size)];
 756         return 0;
 757 }
 758
 759 static int kvm_hv_msr_get_crash_ctl(struct kvm_vcpu *vcpu, u64 *pdata)
 760 {
 761         struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
 762
 763         *pdata = hv->hv_crash_ctl;
 764         return 0;
 765 }
 766
 767 static int kvm_hv_msr_set_crash_ctl(struct kvm_vcpu *vcpu, u64 data, bool host)
 768 {
 769         struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
 770
 771         if (host)
 772                 hv->hv_crash_ctl = data & HV_X64_MSR_CRASH_CTL_NOTIFY;
 773
 774         if (!host && (data & HV_X64_MSR_CRASH_CTL_NOTIFY)) {
 775
 776                 vcpu_debug(vcpu, "hv crash (0x%llx 0x%llx 0x%llx 0x%llx 0x%llx)\n",
 777                           hv->hv_crash_param[0],
 778                           hv->hv_crash_param[1],
 779                           hv->hv_crash_param[2],
 780                           hv->hv_crash_param[3],
 781                           hv->hv_crash_param[4]);
 782
 783                 /* Send notification about crash to user space */
 784                 kvm_make_request(KVM_REQ_HV_CRASH, vcpu);
 785         }
 786
 787         return 0;
 788 }
 789
 790 static int kvm_hv_msr_set_crash_data(struct kvm_vcpu *vcpu,
 791                                      u32 index, u64 data)
 792 {
 793         struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
 794         size_t size = ARRAY_SIZE(hv->hv_crash_param);
 795
 796         if (WARN_ON_ONCE(index >= size))
 797                 return -EINVAL;
 798
 799         hv->hv_crash_param[array_index_nospec(index, size)] = data;
 800         return 0;
 801 }
 802
 803 /*
 804  * The kvmclock and Hyper-V TSC page use similar formulas, and converting
 805  * between them is possible:
 806  *
 807  * kvmclock formula:
 808  *    nsec = (ticks - tsc_timestamp) * tsc_to_system_mul * 2^(tsc_shift-32)
 809  *           + system_time
 810  *
 811  * Hyper-V formula:
 812  *    nsec/100 = ticks * scale / 2^64 + offset
 813  *
 814  * When tsc_timestamp = system_time = 0, offset is zero in the Hyper-V formula.
 815  * By dividing the kvmclock formula by 100 and equating what's left we get:
 816  *    ticks * scale / 2^64 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100
 817  *            scale / 2^64 =         tsc_to_system_mul * 2^(tsc_shift-32) / 100
 818  *            scale        =         tsc_to_system_mul * 2^(32+tsc_shift) / 100
 819  *
 820  * Now expand the kvmclock formula and divide by 100:
 821  *    nsec = ticks * tsc_to_system_mul * 2^(tsc_shift-32)
 822  *           - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32)
 823  *           + system_time
 824  *    nsec/100 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100
 825  *               - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32) / 100
 826  *               + system_time / 100
 827  *
 828  * Replace tsc_to_system_mul * 2^(tsc_shift-32) / 100 by scale / 2^64:
 829  *    nsec/100 = ticks * scale / 2^64
 830  *               - tsc_timestamp * scale / 2^64
 831  *               + system_time / 100
 832  *
 833  * Equate with the Hyper-V formula so that ticks * scale / 2^64 cancels out:
 834  *    offset = system_time / 100 - tsc_timestamp * scale / 2^64
 835  *
 836  * These two equivalencies are implemented in this function.
 837  */
 838 static bool compute_tsc_page_parameters(struct pvclock_vcpu_time_info *hv_clock,
 839                                         HV_REFERENCE_TSC_PAGE *tsc_ref)
 840 {
 841         u64 max_mul;
 842
 843         if (!(hv_clock->flags & PVCLOCK_TSC_STABLE_BIT))
 844                 return false;
 845
 846         /*
 847          * check if scale would overflow, if so we use the time ref counter
 848          *    tsc_to_system_mul * 2^(tsc_shift+32) / 100 >= 2^64
 849          *    tsc_to_system_mul / 100 >= 2^(32-tsc_shift)
 850          *    tsc_to_system_mul >= 100 * 2^(32-tsc_shift)
 851          */
 852         max_mul = 100ull << (32 - hv_clock->tsc_shift);
 853         if (hv_clock->tsc_to_system_mul >= max_mul)
 854                 return false;
 855
 856         /*
 857          * Otherwise compute the scale and offset according to the formulas
 858          * derived above.
 859          */
 860         tsc_ref->tsc_scale =
 861                 mul_u64_u32_div(1ULL << (32 + hv_clock->tsc_shift),
 862                                 hv_clock->tsc_to_system_mul,
 863                                 100);
 864
 865         tsc_ref->tsc_offset = hv_clock->system_time;
 866         do_div(tsc_ref->tsc_offset, 100);
 867         tsc_ref->tsc_offset -=
 868                 mul_u64_u64_shr(hv_clock->tsc_timestamp, tsc_ref->tsc_scale, 64);
 869         return true;
 870 }
 871
 872 void kvm_hv_setup_tsc_page(struct kvm *kvm,
 873                            struct pvclock_vcpu_time_info *hv_clock)
 874 {
 875         struct kvm_hv *hv = &kvm->arch.hyperv;
 876         u32 tsc_seq;
 877         u64 gfn;
 878
 879         BUILD_BUG_ON(sizeof(tsc_seq) != sizeof(hv->tsc_ref.tsc_sequence));
 880         BUILD_BUG_ON(offsetof(HV_REFERENCE_TSC_PAGE, tsc_sequence) != 0);
 881
 882         if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE))
 883                 return;
 884
 885         mutex_lock(&kvm->arch.hyperv.hv_lock);
 886         if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE))
 887                 goto out_unlock;
 888
 889         gfn = hv->hv_tsc_page >> HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT;
 890         /*
 891          * Because the TSC parameters only vary when there is a
 892          * change in the master clock, do not bother with caching.
 893          */
 894         if (unlikely(kvm_read_guest(kvm, gfn_to_gpa(gfn),
 895                                     &tsc_seq, sizeof(tsc_seq))))
 896                 goto out_unlock;
 897
 898         /*
 899          * While we're computing and writing the parameters, force the
 900          * guest to use the time reference count MSR.
 901          */
 902         hv->tsc_ref.tsc_sequence = 0;
 903         if (kvm_write_guest(kvm, gfn_to_gpa(gfn),
 904                             &hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence)))
 905                 goto out_unlock;
 906
 907         if (!compute_tsc_page_parameters(hv_clock, &hv->tsc_ref))
 908                 goto out_unlock;
 909
 910         /* Ensure sequence is zero before writing the rest of the struct.  */
 911         smp_wmb();
 912         if (kvm_write_guest(kvm, gfn_to_gpa(gfn), &hv->tsc_ref, sizeof(hv->tsc_ref)))
 913                 goto out_unlock;
 914
 915         /*
 916          * Now switch to the TSC page mechanism by writing the sequence.
 917          */
 918         tsc_seq++;
 919         if (tsc_seq == 0xFFFFFFFF || tsc_seq == 0)
 920                 tsc_seq = 1;
 921
 922         /* Write the struct entirely before the non-zero sequence.  */
 923         smp_wmb();
 924
 925         hv->tsc_ref.tsc_sequence = tsc_seq;
 926         kvm_write_guest(kvm, gfn_to_gpa(gfn),
 927                         &hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence));
 928 out_unlock:
 929         mutex_unlock(&kvm->arch.hyperv.hv_lock);
 930 }
 931
 932 static int kvm_hv_set_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data,
 933                              bool host)
 934 {
 935         struct kvm *kvm = vcpu->kvm;
 936         struct kvm_hv *hv = &kvm->arch.hyperv;
 937
 938         switch (msr) {
 939         case HV_X64_MSR_GUEST_OS_ID:
 940                 hv->hv_guest_os_id = data;
 941                 /* setting guest os id to zero disables hypercall page */
 942                 if (!hv->hv_guest_os_id)
 943                         hv->hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE;
 944                 break;
 945         case HV_X64_MSR_HYPERCALL: {
 946                 u64 gfn;
 947                 unsigned long addr;
 948                 u8 instructions[4];
 949
 950                 /* if guest os id is not set hypercall should remain disabled */
 951                 if (!hv->hv_guest_os_id)
 952                         break;
 953                 if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) {
 954                         hv->hv_hypercall = data;
 955                         break;
 956                 }
 957                 gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT;
 958                 addr = gfn_to_hva(kvm, gfn);
 959                 if (kvm_is_error_hva(addr))
 960                         return 1;
 961                 kvm_x86_ops->patch_hypercall(vcpu, instructions);
 962                 ((unsigned char *)instructions)[3] = 0xc3; /* ret */
 963                 if (__copy_to_user((void __user *)addr, instructions, 4))
 964                         return 1;
 965                 hv->hv_hypercall = data;
 966                 mark_page_dirty(kvm, gfn);
 967                 break;
 968         }
 969         case HV_X64_MSR_REFERENCE_TSC:
 970                 hv->hv_tsc_page = data;
 971                 if (hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE)
 972                         kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
 973                 break;
 974         case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
 975                 return kvm_hv_msr_set_crash_data(vcpu,
 976                                                  msr - HV_X64_MSR_CRASH_P0,
 977                                                  data);
 978         case HV_X64_MSR_CRASH_CTL:
 979                 return kvm_hv_msr_set_crash_ctl(vcpu, data, host);
 980         case HV_X64_MSR_RESET:
 981                 if (data == 1) {
 982                         vcpu_debug(vcpu, "hyper-v reset requested\n");
 983                         kvm_make_request(KVM_REQ_HV_RESET, vcpu);
 984                 }
 985                 break;
 986         default:
 987                 vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
 988                             msr, data);
 989                 return 1;
 990         }
 991         return 0;
 992 }
 993
 994 /* Calculate cpu time spent by current task in 100ns units */
 995 static u64 current_task_runtime_100ns(void)
 996 {
 997         u64 utime, stime;
 998
 999         task_cputime_adjusted(current, &utime, &stime);
1000
1001         return div_u64(utime + stime, 100);
1002 }
1003
1004 static int kvm_hv_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
1005 {
1006         struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv;
1007
1008         switch (msr) {
1009         case HV_X64_MSR_VP_INDEX:
1010                 if (!host)
1011                         return 1;
1012                 hv->vp_index = (u32)data;
1013                 break;
1014         case HV_X64_MSR_APIC_ASSIST_PAGE: {
1015                 u64 gfn;
1016                 unsigned long addr;
1017
1018                 if (!(data & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE)) {
1019                         hv->hv_vapic = data;
1020                         if (kvm_lapic_enable_pv_eoi(vcpu, 0))
1021                                 return 1;
1022                         break;
1023                 }
1024                 gfn = data >> HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT;
1025                 addr = kvm_vcpu_gfn_to_hva(vcpu, gfn);
1026                 if (kvm_is_error_hva(addr))
1027                         return 1;
1028                 if (__clear_user((void __user *)addr, PAGE_SIZE))
1029                         return 1;
1030                 hv->hv_vapic = data;
1031                 kvm_vcpu_mark_page_dirty(vcpu, gfn);
1032                 if (kvm_lapic_enable_pv_eoi(vcpu,
1033                                             gfn_to_gpa(gfn) | KVM_MSR_ENABLED))
1034                         return 1;
1035                 break;
1036         }
1037         case HV_X64_MSR_EOI:
1038                 return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data);
1039         case HV_X64_MSR_ICR:
1040                 return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data);
1041         case HV_X64_MSR_TPR:
1042                 return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data);
1043         case HV_X64_MSR_VP_RUNTIME:
1044                 if (!host)
1045                         return 1;
1046                 hv->runtime_offset = data - current_task_runtime_100ns();
1047                 break;
1048         case HV_X64_MSR_SCONTROL:
1049         case HV_X64_MSR_SVERSION:
1050         case HV_X64_MSR_SIEFP:
1051         case HV_X64_MSR_SIMP:
1052         case HV_X64_MSR_EOM:
1053         case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
1054                 return synic_set_msr(vcpu_to_synic(vcpu), msr, data, host);
1055         case HV_X64_MSR_STIMER0_CONFIG:
1056         case HV_X64_MSR_STIMER1_CONFIG:
1057         case HV_X64_MSR_STIMER2_CONFIG:
1058         case HV_X64_MSR_STIMER3_CONFIG: {
1059                 int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2;
1060
1061                 return stimer_set_config(vcpu_to_stimer(vcpu, timer_index),
1062                                          data, host);
1063         }
1064         case HV_X64_MSR_STIMER0_COUNT:
1065         case HV_X64_MSR_STIMER1_COUNT:
1066         case HV_X64_MSR_STIMER2_COUNT:
1067         case HV_X64_MSR_STIMER3_COUNT: {
1068                 int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2;
1069
1070                 return stimer_set_count(vcpu_to_stimer(vcpu, timer_index),
1071                                         data, host);
1072         }
1073         default:
1074                 vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
1075                             msr, data);
1076                 return 1;
1077         }
1078
1079         return 0;
1080 }
1081
1082 static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1083 {
1084         u64 data = 0;
1085         struct kvm *kvm = vcpu->kvm;
1086         struct kvm_hv *hv = &kvm->arch.hyperv;
1087
1088         switch (msr) {
1089         case HV_X64_MSR_GUEST_OS_ID:
1090                 data = hv->hv_guest_os_id;
1091                 break;
1092         case HV_X64_MSR_HYPERCALL:
1093                 data = hv->hv_hypercall;
1094                 break;
1095         case HV_X64_MSR_TIME_REF_COUNT:
1096                 data = get_time_ref_counter(kvm);
1097                 break;
1098         case HV_X64_MSR_REFERENCE_TSC:
1099                 data = hv->hv_tsc_page;
1100                 break;
1101         case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
1102                 return kvm_hv_msr_get_crash_data(vcpu,
1103                                                  msr - HV_X64_MSR_CRASH_P0,
1104                                                  pdata);
1105         case HV_X64_MSR_CRASH_CTL:
1106                 return kvm_hv_msr_get_crash_ctl(vcpu, pdata);
1107         case HV_X64_MSR_RESET:
1108                 data = 0;
1109                 break;
1110         default:
1111                 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1112                 return 1;
1113         }
1114
1115         *pdata = data;
1116         return 0;
1117 }
1118
1119 static int kvm_hv_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1120 {
1121         u64 data = 0;
1122         struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv;
1123
1124         switch (msr) {
1125         case HV_X64_MSR_VP_INDEX:
1126                 data = hv->vp_index;
1127                 break;
1128         case HV_X64_MSR_EOI:
1129                 return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata);
1130         case HV_X64_MSR_ICR:
1131                 return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata);
1132         case HV_X64_MSR_TPR:
1133                 return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata);
1134         case HV_X64_MSR_APIC_ASSIST_PAGE:
1135                 data = hv->hv_vapic;
1136                 break;
1137         case HV_X64_MSR_VP_RUNTIME:
1138                 data = current_task_runtime_100ns() + hv->runtime_offset;
1139                 break;
1140         case HV_X64_MSR_SCONTROL:
1141         case HV_X64_MSR_SVERSION:
1142         case HV_X64_MSR_SIEFP:
1143         case HV_X64_MSR_SIMP:
1144         case HV_X64_MSR_EOM:
1145         case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
1146                 return synic_get_msr(vcpu_to_synic(vcpu), msr, pdata);
1147         case HV_X64_MSR_STIMER0_CONFIG:
1148         case HV_X64_MSR_STIMER1_CONFIG:
1149         case HV_X64_MSR_STIMER2_CONFIG:
1150         case HV_X64_MSR_STIMER3_CONFIG: {
1151                 int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2;
1152
1153                 return stimer_get_config(vcpu_to_stimer(vcpu, timer_index),
1154                                          pdata);
1155         }
1156         case HV_X64_MSR_STIMER0_COUNT:
1157         case HV_X64_MSR_STIMER1_COUNT:
1158         case HV_X64_MSR_STIMER2_COUNT:
1159         case HV_X64_MSR_STIMER3_COUNT: {
1160                 int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2;
1161
1162                 return stimer_get_count(vcpu_to_stimer(vcpu, timer_index),
1163                                         pdata);
1164         }
1165         case HV_X64_MSR_TSC_FREQUENCY:
1166                 data = (u64)vcpu->arch.virtual_tsc_khz * 1000;
1167                 break;
1168         case HV_X64_MSR_APIC_FREQUENCY:
1169                 data = APIC_BUS_FREQUENCY;
1170                 break;
1171         default:
1172                 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1173                 return 1;
1174         }
1175         *pdata = data;
1176         return 0;
1177 }
1178
1179 int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
1180 {
1181         if (kvm_hv_msr_partition_wide(msr)) {
1182                 int r;
1183
1184                 mutex_lock(&vcpu->kvm->arch.hyperv.hv_lock);
1185                 r = kvm_hv_set_msr_pw(vcpu, msr, data, host);
1186                 mutex_unlock(&vcpu->kvm->arch.hyperv.hv_lock);
1187                 return r;
1188         } else
1189                 return kvm_hv_set_msr(vcpu, msr, data, host);
1190 }
1191
1192 int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1193 {
1194         if (kvm_hv_msr_partition_wide(msr)) {
1195                 int r;
1196
1197                 mutex_lock(&vcpu->kvm->arch.hyperv.hv_lock);
1198                 r = kvm_hv_get_msr_pw(vcpu, msr, pdata);
1199                 mutex_unlock(&vcpu->kvm->arch.hyperv.hv_lock);
1200                 return r;
1201         } else
1202                 return kvm_hv_get_msr(vcpu, msr, pdata);
1203 }
1204
1205 bool kvm_hv_hypercall_enabled(struct kvm *kvm)
1206 {
1207         return READ_ONCE(kvm->arch.hyperv.hv_hypercall) & HV_X64_MSR_HYPERCALL_ENABLE;
1208 }
1209
1210 static void kvm_hv_hypercall_set_result(struct kvm_vcpu *vcpu, u64 result)
1211 {
1212         bool longmode;
1213
1214         longmode = is_64_bit_mode(vcpu);
1215         if (longmode)
1216                 kvm_register_write(vcpu, VCPU_REGS_RAX, result);
1217         else {
1218                 kvm_register_write(vcpu, VCPU_REGS_RDX, result >> 32);
1219                 kvm_register_write(vcpu, VCPU_REGS_RAX, result & 0xffffffff);
1220         }
1221 }
1222
1223 static int kvm_hv_hypercall_complete_userspace(struct kvm_vcpu *vcpu)
1224 {
1225         struct kvm_run *run = vcpu->run;
1226
1227         kvm_hv_hypercall_set_result(vcpu, run->hyperv.u.hcall.result);
1228         return kvm_skip_emulated_instruction(vcpu);
1229 }
1230
1231 int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
1232 {
1233         u64 param, ingpa, outgpa, ret;
1234         uint16_t code, rep_idx, rep_cnt, res = HV_STATUS_SUCCESS, rep_done = 0;
1235         bool fast, longmode;
1236
1237         /*
1238          * hypercall generates UD from non zero cpl and real mode
1239          * per HYPER-V spec
1240          */
1241         if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) {
1242                 kvm_queue_exception(vcpu, UD_VECTOR);
1243                 return 1;
1244         }
1245
1246         longmode = is_64_bit_mode(vcpu);
1247
1248         if (!longmode) {
1249                 param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) |
1250                         (kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff);
1251                 ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) |
1252                         (kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff);
1253                 outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) |
1254                         (kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff);
1255         }
1256 #ifdef CONFIG_X86_64
1257         else {
1258                 param = kvm_register_read(vcpu, VCPU_REGS_RCX);
1259                 ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX);
1260                 outgpa = kvm_register_read(vcpu, VCPU_REGS_R8);
1261         }
1262 #endif
1263
1264         code = param & 0xffff;
1265         fast = (param >> 16) & 0x1;
1266         rep_cnt = (param >> 32) & 0xfff;
1267         rep_idx = (param >> 48) & 0xfff;
1268
1269         trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa);
1270
1271         /* Hypercall continuation is not supported yet */
1272         if (rep_cnt || rep_idx) {
1273                 res = HV_STATUS_INVALID_HYPERCALL_CODE;
1274                 goto set_result;
1275         }
1276
1277         switch (code) {
1278         case HVCALL_NOTIFY_LONG_SPIN_WAIT:
1279                 kvm_vcpu_on_spin(vcpu, true);
1280                 break;
1281         case HVCALL_POST_MESSAGE:
1282         case HVCALL_SIGNAL_EVENT:
1283                 /* don't bother userspace if it has no way to handle it */
1284                 if (!vcpu_to_synic(vcpu)->active) {
1285                         res = HV_STATUS_INVALID_HYPERCALL_CODE;
1286                         break;
1287                 }
1288                 vcpu->run->exit_reason = KVM_EXIT_HYPERV;
1289                 vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL;
1290                 vcpu->run->hyperv.u.hcall.input = param;
1291                 vcpu->run->hyperv.u.hcall.params[0] = ingpa;
1292                 vcpu->run->hyperv.u.hcall.params[1] = outgpa;
1293                 vcpu->arch.complete_userspace_io =
1294                                 kvm_hv_hypercall_complete_userspace;
1295                 return 0;
1296         default:
1297                 res = HV_STATUS_INVALID_HYPERCALL_CODE;
1298                 break;
1299         }
1300
1301 set_result:
1302         ret = res | (((u64)rep_done & 0xfff) << 32);
1303         kvm_hv_hypercall_set_result(vcpu, ret);
1304         return 1;
1305 }