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