1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * KVM Microsoft Hyper-V emulation 4 * 5 * derived from arch/x86/kvm/x86.c 6 * 7 * Copyright (C) 2006 Qumranet, Inc. 8 * Copyright (C) 2008 Qumranet, Inc. 9 * Copyright IBM Corporation, 2008 10 * Copyright 2010 Red Hat, Inc. and/or its affiliates. 11 * Copyright (C) 2015 Andrey Smetanin <asmetanin@virtuozzo.com> 12 * 13 * Authors: 14 * Avi Kivity <avi@qumranet.com> 15 * Yaniv Kamay <yaniv@qumranet.com> 16 * Amit Shah <amit.shah@qumranet.com> 17 * Ben-Ami Yassour <benami@il.ibm.com> 18 * Andrey Smetanin <asmetanin@virtuozzo.com> 19 */ 20 21 #include "x86.h" 22 #include "lapic.h" 23 #include "ioapic.h" 24 #include "cpuid.h" 25 #include "hyperv.h" 26 #include "mmu.h" 27 #include "xen.h" 28 29 #include <linux/cpu.h> 30 #include <linux/kvm_host.h> 31 #include <linux/highmem.h> 32 #include <linux/sched/cputime.h> 33 #include <linux/spinlock.h> 34 #include <linux/eventfd.h> 35 36 #include <asm/apicdef.h> 37 #include <asm/mshyperv.h> 38 #include <trace/events/kvm.h> 39 40 #include "trace.h" 41 #include "irq.h" 42 #include "fpu.h" 43 44 #define KVM_HV_MAX_SPARSE_VCPU_SET_BITS DIV_ROUND_UP(KVM_MAX_VCPUS, HV_VCPUS_PER_SPARSE_BANK) 45 46 static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer, 47 bool vcpu_kick); 48 49 static inline u64 synic_read_sint(struct kvm_vcpu_hv_synic *synic, int sint) 50 { 51 return atomic64_read(&synic->sint[sint]); 52 } 53 54 static inline int synic_get_sint_vector(u64 sint_value) 55 { 56 if (sint_value & HV_SYNIC_SINT_MASKED) 57 return -1; 58 return sint_value & HV_SYNIC_SINT_VECTOR_MASK; 59 } 60 61 static bool synic_has_vector_connected(struct kvm_vcpu_hv_synic *synic, 62 int vector) 63 { 64 int i; 65 66 for (i = 0; i < ARRAY_SIZE(synic->sint); i++) { 67 if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector) 68 return true; 69 } 70 return false; 71 } 72 73 static bool synic_has_vector_auto_eoi(struct kvm_vcpu_hv_synic *synic, 74 int vector) 75 { 76 int i; 77 u64 sint_value; 78 79 for (i = 0; i < ARRAY_SIZE(synic->sint); i++) { 80 sint_value = synic_read_sint(synic, i); 81 if (synic_get_sint_vector(sint_value) == vector && 82 sint_value & HV_SYNIC_SINT_AUTO_EOI) 83 return true; 84 } 85 return false; 86 } 87 88 static void synic_update_vector(struct kvm_vcpu_hv_synic *synic, 89 int vector) 90 { 91 struct kvm_vcpu *vcpu = hv_synic_to_vcpu(synic); 92 struct kvm_hv *hv = to_kvm_hv(vcpu->kvm); 93 bool auto_eoi_old, auto_eoi_new; 94 95 if (vector < HV_SYNIC_FIRST_VALID_VECTOR) 96 return; 97 98 if (synic_has_vector_connected(synic, vector)) 99 __set_bit(vector, synic->vec_bitmap); 100 else 101 __clear_bit(vector, synic->vec_bitmap); 102 103 auto_eoi_old = !bitmap_empty(synic->auto_eoi_bitmap, 256); 104 105 if (synic_has_vector_auto_eoi(synic, vector)) 106 __set_bit(vector, synic->auto_eoi_bitmap); 107 else 108 __clear_bit(vector, synic->auto_eoi_bitmap); 109 110 auto_eoi_new = !bitmap_empty(synic->auto_eoi_bitmap, 256); 111 112 if (auto_eoi_old == auto_eoi_new) 113 return; 114 115 if (!enable_apicv) 116 return; 117 118 down_write(&vcpu->kvm->arch.apicv_update_lock); 119 120 if (auto_eoi_new) 121 hv->synic_auto_eoi_used++; 122 else 123 hv->synic_auto_eoi_used--; 124 125 /* 126 * Inhibit APICv if any vCPU is using SynIC's AutoEOI, which relies on 127 * the hypervisor to manually inject IRQs. 128 */ 129 __kvm_set_or_clear_apicv_inhibit(vcpu->kvm, 130 APICV_INHIBIT_REASON_HYPERV, 131 !!hv->synic_auto_eoi_used); 132 133 up_write(&vcpu->kvm->arch.apicv_update_lock); 134 } 135 136 static int synic_set_sint(struct kvm_vcpu_hv_synic *synic, int sint, 137 u64 data, bool host) 138 { 139 int vector, old_vector; 140 bool masked; 141 142 vector = data & HV_SYNIC_SINT_VECTOR_MASK; 143 masked = data & HV_SYNIC_SINT_MASKED; 144 145 /* 146 * Valid vectors are 16-255, however, nested Hyper-V attempts to write 147 * default '0x10000' value on boot and this should not #GP. We need to 148 * allow zero-initing the register from host as well. 149 */ 150 if (vector < HV_SYNIC_FIRST_VALID_VECTOR && !host && !masked) 151 return 1; 152 /* 153 * Guest may configure multiple SINTs to use the same vector, so 154 * we maintain a bitmap of vectors handled by synic, and a 155 * bitmap of vectors with auto-eoi behavior. The bitmaps are 156 * updated here, and atomically queried on fast paths. 157 */ 158 old_vector = synic_read_sint(synic, sint) & HV_SYNIC_SINT_VECTOR_MASK; 159 160 atomic64_set(&synic->sint[sint], data); 161 162 synic_update_vector(synic, old_vector); 163 164 synic_update_vector(synic, vector); 165 166 /* Load SynIC vectors into EOI exit bitmap */ 167 kvm_make_request(KVM_REQ_SCAN_IOAPIC, hv_synic_to_vcpu(synic)); 168 return 0; 169 } 170 171 static struct kvm_vcpu *get_vcpu_by_vpidx(struct kvm *kvm, u32 vpidx) 172 { 173 struct kvm_vcpu *vcpu = NULL; 174 unsigned long i; 175 176 if (vpidx >= KVM_MAX_VCPUS) 177 return NULL; 178 179 vcpu = kvm_get_vcpu(kvm, vpidx); 180 if (vcpu && kvm_hv_get_vpindex(vcpu) == vpidx) 181 return vcpu; 182 kvm_for_each_vcpu(i, vcpu, kvm) 183 if (kvm_hv_get_vpindex(vcpu) == vpidx) 184 return vcpu; 185 return NULL; 186 } 187 188 static struct kvm_vcpu_hv_synic *synic_get(struct kvm *kvm, u32 vpidx) 189 { 190 struct kvm_vcpu *vcpu; 191 struct kvm_vcpu_hv_synic *synic; 192 193 vcpu = get_vcpu_by_vpidx(kvm, vpidx); 194 if (!vcpu || !to_hv_vcpu(vcpu)) 195 return NULL; 196 synic = to_hv_synic(vcpu); 197 return (synic->active) ? synic : NULL; 198 } 199 200 static void kvm_hv_notify_acked_sint(struct kvm_vcpu *vcpu, u32 sint) 201 { 202 struct kvm *kvm = vcpu->kvm; 203 struct kvm_vcpu_hv_synic *synic = to_hv_synic(vcpu); 204 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); 205 struct kvm_vcpu_hv_stimer *stimer; 206 int gsi, idx; 207 208 trace_kvm_hv_notify_acked_sint(vcpu->vcpu_id, sint); 209 210 /* Try to deliver pending Hyper-V SynIC timers messages */ 211 for (idx = 0; idx < ARRAY_SIZE(hv_vcpu->stimer); idx++) { 212 stimer = &hv_vcpu->stimer[idx]; 213 if (stimer->msg_pending && stimer->config.enable && 214 !stimer->config.direct_mode && 215 stimer->config.sintx == sint) 216 stimer_mark_pending(stimer, false); 217 } 218 219 idx = srcu_read_lock(&kvm->irq_srcu); 220 gsi = atomic_read(&synic->sint_to_gsi[sint]); 221 if (gsi != -1) 222 kvm_notify_acked_gsi(kvm, gsi); 223 srcu_read_unlock(&kvm->irq_srcu, idx); 224 } 225 226 static void synic_exit(struct kvm_vcpu_hv_synic *synic, u32 msr) 227 { 228 struct kvm_vcpu *vcpu = hv_synic_to_vcpu(synic); 229 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); 230 231 hv_vcpu->exit.type = KVM_EXIT_HYPERV_SYNIC; 232 hv_vcpu->exit.u.synic.msr = msr; 233 hv_vcpu->exit.u.synic.control = synic->control; 234 hv_vcpu->exit.u.synic.evt_page = synic->evt_page; 235 hv_vcpu->exit.u.synic.msg_page = synic->msg_page; 236 237 kvm_make_request(KVM_REQ_HV_EXIT, vcpu); 238 } 239 240 static int synic_set_msr(struct kvm_vcpu_hv_synic *synic, 241 u32 msr, u64 data, bool host) 242 { 243 struct kvm_vcpu *vcpu = hv_synic_to_vcpu(synic); 244 int ret; 245 246 if (!synic->active && (!host || data)) 247 return 1; 248 249 trace_kvm_hv_synic_set_msr(vcpu->vcpu_id, msr, data, host); 250 251 ret = 0; 252 switch (msr) { 253 case HV_X64_MSR_SCONTROL: 254 synic->control = data; 255 if (!host) 256 synic_exit(synic, msr); 257 break; 258 case HV_X64_MSR_SVERSION: 259 if (!host) { 260 ret = 1; 261 break; 262 } 263 synic->version = data; 264 break; 265 case HV_X64_MSR_SIEFP: 266 if ((data & HV_SYNIC_SIEFP_ENABLE) && !host && 267 !synic->dont_zero_synic_pages) 268 if (kvm_clear_guest(vcpu->kvm, 269 data & PAGE_MASK, PAGE_SIZE)) { 270 ret = 1; 271 break; 272 } 273 synic->evt_page = data; 274 if (!host) 275 synic_exit(synic, msr); 276 break; 277 case HV_X64_MSR_SIMP: 278 if ((data & HV_SYNIC_SIMP_ENABLE) && !host && 279 !synic->dont_zero_synic_pages) 280 if (kvm_clear_guest(vcpu->kvm, 281 data & PAGE_MASK, PAGE_SIZE)) { 282 ret = 1; 283 break; 284 } 285 synic->msg_page = data; 286 if (!host) 287 synic_exit(synic, msr); 288 break; 289 case HV_X64_MSR_EOM: { 290 int i; 291 292 if (!synic->active) 293 break; 294 295 for (i = 0; i < ARRAY_SIZE(synic->sint); i++) 296 kvm_hv_notify_acked_sint(vcpu, i); 297 break; 298 } 299 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15: 300 ret = synic_set_sint(synic, msr - HV_X64_MSR_SINT0, data, host); 301 break; 302 default: 303 ret = 1; 304 break; 305 } 306 return ret; 307 } 308 309 static bool kvm_hv_is_syndbg_enabled(struct kvm_vcpu *vcpu) 310 { 311 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); 312 313 return hv_vcpu->cpuid_cache.syndbg_cap_eax & 314 HV_X64_SYNDBG_CAP_ALLOW_KERNEL_DEBUGGING; 315 } 316 317 static int kvm_hv_syndbg_complete_userspace(struct kvm_vcpu *vcpu) 318 { 319 struct kvm_hv *hv = to_kvm_hv(vcpu->kvm); 320 321 if (vcpu->run->hyperv.u.syndbg.msr == HV_X64_MSR_SYNDBG_CONTROL) 322 hv->hv_syndbg.control.status = 323 vcpu->run->hyperv.u.syndbg.status; 324 return 1; 325 } 326 327 static void syndbg_exit(struct kvm_vcpu *vcpu, u32 msr) 328 { 329 struct kvm_hv_syndbg *syndbg = to_hv_syndbg(vcpu); 330 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); 331 332 hv_vcpu->exit.type = KVM_EXIT_HYPERV_SYNDBG; 333 hv_vcpu->exit.u.syndbg.msr = msr; 334 hv_vcpu->exit.u.syndbg.control = syndbg->control.control; 335 hv_vcpu->exit.u.syndbg.send_page = syndbg->control.send_page; 336 hv_vcpu->exit.u.syndbg.recv_page = syndbg->control.recv_page; 337 hv_vcpu->exit.u.syndbg.pending_page = syndbg->control.pending_page; 338 vcpu->arch.complete_userspace_io = 339 kvm_hv_syndbg_complete_userspace; 340 341 kvm_make_request(KVM_REQ_HV_EXIT, vcpu); 342 } 343 344 static int syndbg_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host) 345 { 346 struct kvm_hv_syndbg *syndbg = to_hv_syndbg(vcpu); 347 348 if (!kvm_hv_is_syndbg_enabled(vcpu) && !host) 349 return 1; 350 351 trace_kvm_hv_syndbg_set_msr(vcpu->vcpu_id, 352 to_hv_vcpu(vcpu)->vp_index, msr, data); 353 switch (msr) { 354 case HV_X64_MSR_SYNDBG_CONTROL: 355 syndbg->control.control = data; 356 if (!host) 357 syndbg_exit(vcpu, msr); 358 break; 359 case HV_X64_MSR_SYNDBG_STATUS: 360 syndbg->control.status = data; 361 break; 362 case HV_X64_MSR_SYNDBG_SEND_BUFFER: 363 syndbg->control.send_page = data; 364 break; 365 case HV_X64_MSR_SYNDBG_RECV_BUFFER: 366 syndbg->control.recv_page = data; 367 break; 368 case HV_X64_MSR_SYNDBG_PENDING_BUFFER: 369 syndbg->control.pending_page = data; 370 if (!host) 371 syndbg_exit(vcpu, msr); 372 break; 373 case HV_X64_MSR_SYNDBG_OPTIONS: 374 syndbg->options = data; 375 break; 376 default: 377 break; 378 } 379 380 return 0; 381 } 382 383 static int syndbg_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host) 384 { 385 struct kvm_hv_syndbg *syndbg = to_hv_syndbg(vcpu); 386 387 if (!kvm_hv_is_syndbg_enabled(vcpu) && !host) 388 return 1; 389 390 switch (msr) { 391 case HV_X64_MSR_SYNDBG_CONTROL: 392 *pdata = syndbg->control.control; 393 break; 394 case HV_X64_MSR_SYNDBG_STATUS: 395 *pdata = syndbg->control.status; 396 break; 397 case HV_X64_MSR_SYNDBG_SEND_BUFFER: 398 *pdata = syndbg->control.send_page; 399 break; 400 case HV_X64_MSR_SYNDBG_RECV_BUFFER: 401 *pdata = syndbg->control.recv_page; 402 break; 403 case HV_X64_MSR_SYNDBG_PENDING_BUFFER: 404 *pdata = syndbg->control.pending_page; 405 break; 406 case HV_X64_MSR_SYNDBG_OPTIONS: 407 *pdata = syndbg->options; 408 break; 409 default: 410 break; 411 } 412 413 trace_kvm_hv_syndbg_get_msr(vcpu->vcpu_id, kvm_hv_get_vpindex(vcpu), msr, *pdata); 414 415 return 0; 416 } 417 418 static int synic_get_msr(struct kvm_vcpu_hv_synic *synic, u32 msr, u64 *pdata, 419 bool host) 420 { 421 int ret; 422 423 if (!synic->active && !host) 424 return 1; 425 426 ret = 0; 427 switch (msr) { 428 case HV_X64_MSR_SCONTROL: 429 *pdata = synic->control; 430 break; 431 case HV_X64_MSR_SVERSION: 432 *pdata = synic->version; 433 break; 434 case HV_X64_MSR_SIEFP: 435 *pdata = synic->evt_page; 436 break; 437 case HV_X64_MSR_SIMP: 438 *pdata = synic->msg_page; 439 break; 440 case HV_X64_MSR_EOM: 441 *pdata = 0; 442 break; 443 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15: 444 *pdata = atomic64_read(&synic->sint[msr - HV_X64_MSR_SINT0]); 445 break; 446 default: 447 ret = 1; 448 break; 449 } 450 return ret; 451 } 452 453 static int synic_set_irq(struct kvm_vcpu_hv_synic *synic, u32 sint) 454 { 455 struct kvm_vcpu *vcpu = hv_synic_to_vcpu(synic); 456 struct kvm_lapic_irq irq; 457 int ret, vector; 458 459 if (KVM_BUG_ON(!lapic_in_kernel(vcpu), vcpu->kvm)) 460 return -EINVAL; 461 462 if (sint >= ARRAY_SIZE(synic->sint)) 463 return -EINVAL; 464 465 vector = synic_get_sint_vector(synic_read_sint(synic, sint)); 466 if (vector < 0) 467 return -ENOENT; 468 469 memset(&irq, 0, sizeof(irq)); 470 irq.shorthand = APIC_DEST_SELF; 471 irq.dest_mode = APIC_DEST_PHYSICAL; 472 irq.delivery_mode = APIC_DM_FIXED; 473 irq.vector = vector; 474 irq.level = 1; 475 476 ret = kvm_irq_delivery_to_apic(vcpu->kvm, vcpu->arch.apic, &irq, NULL); 477 trace_kvm_hv_synic_set_irq(vcpu->vcpu_id, sint, irq.vector, ret); 478 return ret; 479 } 480 481 int kvm_hv_synic_set_irq(struct kvm *kvm, u32 vpidx, u32 sint) 482 { 483 struct kvm_vcpu_hv_synic *synic; 484 485 synic = synic_get(kvm, vpidx); 486 if (!synic) 487 return -EINVAL; 488 489 return synic_set_irq(synic, sint); 490 } 491 492 void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector) 493 { 494 struct kvm_vcpu_hv_synic *synic = to_hv_synic(vcpu); 495 int i; 496 497 trace_kvm_hv_synic_send_eoi(vcpu->vcpu_id, vector); 498 499 for (i = 0; i < ARRAY_SIZE(synic->sint); i++) 500 if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector) 501 kvm_hv_notify_acked_sint(vcpu, i); 502 } 503 504 static int kvm_hv_set_sint_gsi(struct kvm *kvm, u32 vpidx, u32 sint, int gsi) 505 { 506 struct kvm_vcpu_hv_synic *synic; 507 508 synic = synic_get(kvm, vpidx); 509 if (!synic) 510 return -EINVAL; 511 512 if (sint >= ARRAY_SIZE(synic->sint_to_gsi)) 513 return -EINVAL; 514 515 atomic_set(&synic->sint_to_gsi[sint], gsi); 516 return 0; 517 } 518 519 void kvm_hv_irq_routing_update(struct kvm *kvm) 520 { 521 struct kvm_irq_routing_table *irq_rt; 522 struct kvm_kernel_irq_routing_entry *e; 523 u32 gsi; 524 525 irq_rt = srcu_dereference_check(kvm->irq_routing, &kvm->irq_srcu, 526 lockdep_is_held(&kvm->irq_lock)); 527 528 for (gsi = 0; gsi < irq_rt->nr_rt_entries; gsi++) { 529 hlist_for_each_entry(e, &irq_rt->map[gsi], link) { 530 if (e->type == KVM_IRQ_ROUTING_HV_SINT) 531 kvm_hv_set_sint_gsi(kvm, e->hv_sint.vcpu, 532 e->hv_sint.sint, gsi); 533 } 534 } 535 } 536 537 static void synic_init(struct kvm_vcpu_hv_synic *synic) 538 { 539 int i; 540 541 memset(synic, 0, sizeof(*synic)); 542 synic->version = HV_SYNIC_VERSION_1; 543 for (i = 0; i < ARRAY_SIZE(synic->sint); i++) { 544 atomic64_set(&synic->sint[i], HV_SYNIC_SINT_MASKED); 545 atomic_set(&synic->sint_to_gsi[i], -1); 546 } 547 } 548 549 static u64 get_time_ref_counter(struct kvm *kvm) 550 { 551 struct kvm_hv *hv = to_kvm_hv(kvm); 552 struct kvm_vcpu *vcpu; 553 u64 tsc; 554 555 /* 556 * Fall back to get_kvmclock_ns() when TSC page hasn't been set up, 557 * is broken, disabled or being updated. 558 */ 559 if (hv->hv_tsc_page_status != HV_TSC_PAGE_SET) 560 return div_u64(get_kvmclock_ns(kvm), 100); 561 562 vcpu = kvm_get_vcpu(kvm, 0); 563 tsc = kvm_read_l1_tsc(vcpu, rdtsc()); 564 return mul_u64_u64_shr(tsc, hv->tsc_ref.tsc_scale, 64) 565 + hv->tsc_ref.tsc_offset; 566 } 567 568 static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer, 569 bool vcpu_kick) 570 { 571 struct kvm_vcpu *vcpu = hv_stimer_to_vcpu(stimer); 572 573 set_bit(stimer->index, 574 to_hv_vcpu(vcpu)->stimer_pending_bitmap); 575 kvm_make_request(KVM_REQ_HV_STIMER, vcpu); 576 if (vcpu_kick) 577 kvm_vcpu_kick(vcpu); 578 } 579 580 static void stimer_cleanup(struct kvm_vcpu_hv_stimer *stimer) 581 { 582 struct kvm_vcpu *vcpu = hv_stimer_to_vcpu(stimer); 583 584 trace_kvm_hv_stimer_cleanup(hv_stimer_to_vcpu(stimer)->vcpu_id, 585 stimer->index); 586 587 hrtimer_cancel(&stimer->timer); 588 clear_bit(stimer->index, 589 to_hv_vcpu(vcpu)->stimer_pending_bitmap); 590 stimer->msg_pending = false; 591 stimer->exp_time = 0; 592 } 593 594 static enum hrtimer_restart stimer_timer_callback(struct hrtimer *timer) 595 { 596 struct kvm_vcpu_hv_stimer *stimer; 597 598 stimer = container_of(timer, struct kvm_vcpu_hv_stimer, timer); 599 trace_kvm_hv_stimer_callback(hv_stimer_to_vcpu(stimer)->vcpu_id, 600 stimer->index); 601 stimer_mark_pending(stimer, true); 602 603 return HRTIMER_NORESTART; 604 } 605 606 /* 607 * stimer_start() assumptions: 608 * a) stimer->count is not equal to 0 609 * b) stimer->config has HV_STIMER_ENABLE flag 610 */ 611 static int stimer_start(struct kvm_vcpu_hv_stimer *stimer) 612 { 613 u64 time_now; 614 ktime_t ktime_now; 615 616 time_now = get_time_ref_counter(hv_stimer_to_vcpu(stimer)->kvm); 617 ktime_now = ktime_get(); 618 619 if (stimer->config.periodic) { 620 if (stimer->exp_time) { 621 if (time_now >= stimer->exp_time) { 622 u64 remainder; 623 624 div64_u64_rem(time_now - stimer->exp_time, 625 stimer->count, &remainder); 626 stimer->exp_time = 627 time_now + (stimer->count - remainder); 628 } 629 } else 630 stimer->exp_time = time_now + stimer->count; 631 632 trace_kvm_hv_stimer_start_periodic( 633 hv_stimer_to_vcpu(stimer)->vcpu_id, 634 stimer->index, 635 time_now, stimer->exp_time); 636 637 hrtimer_start(&stimer->timer, 638 ktime_add_ns(ktime_now, 639 100 * (stimer->exp_time - time_now)), 640 HRTIMER_MODE_ABS); 641 return 0; 642 } 643 stimer->exp_time = stimer->count; 644 if (time_now >= stimer->count) { 645 /* 646 * Expire timer according to Hypervisor Top-Level Functional 647 * specification v4(15.3.1): 648 * "If a one shot is enabled and the specified count is in 649 * the past, it will expire immediately." 650 */ 651 stimer_mark_pending(stimer, false); 652 return 0; 653 } 654 655 trace_kvm_hv_stimer_start_one_shot(hv_stimer_to_vcpu(stimer)->vcpu_id, 656 stimer->index, 657 time_now, stimer->count); 658 659 hrtimer_start(&stimer->timer, 660 ktime_add_ns(ktime_now, 100 * (stimer->count - time_now)), 661 HRTIMER_MODE_ABS); 662 return 0; 663 } 664 665 static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config, 666 bool host) 667 { 668 union hv_stimer_config new_config = {.as_uint64 = config}, 669 old_config = {.as_uint64 = stimer->config.as_uint64}; 670 struct kvm_vcpu *vcpu = hv_stimer_to_vcpu(stimer); 671 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); 672 struct kvm_vcpu_hv_synic *synic = to_hv_synic(vcpu); 673 674 if (!synic->active && (!host || config)) 675 return 1; 676 677 if (unlikely(!host && hv_vcpu->enforce_cpuid && new_config.direct_mode && 678 !(hv_vcpu->cpuid_cache.features_edx & 679 HV_STIMER_DIRECT_MODE_AVAILABLE))) 680 return 1; 681 682 trace_kvm_hv_stimer_set_config(hv_stimer_to_vcpu(stimer)->vcpu_id, 683 stimer->index, config, host); 684 685 stimer_cleanup(stimer); 686 if (old_config.enable && 687 !new_config.direct_mode && new_config.sintx == 0) 688 new_config.enable = 0; 689 stimer->config.as_uint64 = new_config.as_uint64; 690 691 if (stimer->config.enable) 692 stimer_mark_pending(stimer, false); 693 694 return 0; 695 } 696 697 static int stimer_set_count(struct kvm_vcpu_hv_stimer *stimer, u64 count, 698 bool host) 699 { 700 struct kvm_vcpu *vcpu = hv_stimer_to_vcpu(stimer); 701 struct kvm_vcpu_hv_synic *synic = to_hv_synic(vcpu); 702 703 if (!synic->active && (!host || count)) 704 return 1; 705 706 trace_kvm_hv_stimer_set_count(hv_stimer_to_vcpu(stimer)->vcpu_id, 707 stimer->index, count, host); 708 709 stimer_cleanup(stimer); 710 stimer->count = count; 711 if (stimer->count == 0) 712 stimer->config.enable = 0; 713 else if (stimer->config.auto_enable) 714 stimer->config.enable = 1; 715 716 if (stimer->config.enable) 717 stimer_mark_pending(stimer, false); 718 719 return 0; 720 } 721 722 static int stimer_get_config(struct kvm_vcpu_hv_stimer *stimer, u64 *pconfig) 723 { 724 *pconfig = stimer->config.as_uint64; 725 return 0; 726 } 727 728 static int stimer_get_count(struct kvm_vcpu_hv_stimer *stimer, u64 *pcount) 729 { 730 *pcount = stimer->count; 731 return 0; 732 } 733 734 static int synic_deliver_msg(struct kvm_vcpu_hv_synic *synic, u32 sint, 735 struct hv_message *src_msg, bool no_retry) 736 { 737 struct kvm_vcpu *vcpu = hv_synic_to_vcpu(synic); 738 int msg_off = offsetof(struct hv_message_page, sint_message[sint]); 739 gfn_t msg_page_gfn; 740 struct hv_message_header hv_hdr; 741 int r; 742 743 if (!(synic->msg_page & HV_SYNIC_SIMP_ENABLE)) 744 return -ENOENT; 745 746 msg_page_gfn = synic->msg_page >> PAGE_SHIFT; 747 748 /* 749 * Strictly following the spec-mandated ordering would assume setting 750 * .msg_pending before checking .message_type. However, this function 751 * is only called in vcpu context so the entire update is atomic from 752 * guest POV and thus the exact order here doesn't matter. 753 */ 754 r = kvm_vcpu_read_guest_page(vcpu, msg_page_gfn, &hv_hdr.message_type, 755 msg_off + offsetof(struct hv_message, 756 header.message_type), 757 sizeof(hv_hdr.message_type)); 758 if (r < 0) 759 return r; 760 761 if (hv_hdr.message_type != HVMSG_NONE) { 762 if (no_retry) 763 return 0; 764 765 hv_hdr.message_flags.msg_pending = 1; 766 r = kvm_vcpu_write_guest_page(vcpu, msg_page_gfn, 767 &hv_hdr.message_flags, 768 msg_off + 769 offsetof(struct hv_message, 770 header.message_flags), 771 sizeof(hv_hdr.message_flags)); 772 if (r < 0) 773 return r; 774 return -EAGAIN; 775 } 776 777 r = kvm_vcpu_write_guest_page(vcpu, msg_page_gfn, src_msg, msg_off, 778 sizeof(src_msg->header) + 779 src_msg->header.payload_size); 780 if (r < 0) 781 return r; 782 783 r = synic_set_irq(synic, sint); 784 if (r < 0) 785 return r; 786 if (r == 0) 787 return -EFAULT; 788 return 0; 789 } 790 791 static int stimer_send_msg(struct kvm_vcpu_hv_stimer *stimer) 792 { 793 struct kvm_vcpu *vcpu = hv_stimer_to_vcpu(stimer); 794 struct hv_message *msg = &stimer->msg; 795 struct hv_timer_message_payload *payload = 796 (struct hv_timer_message_payload *)&msg->u.payload; 797 798 /* 799 * To avoid piling up periodic ticks, don't retry message 800 * delivery for them (within "lazy" lost ticks policy). 801 */ 802 bool no_retry = stimer->config.periodic; 803 804 payload->expiration_time = stimer->exp_time; 805 payload->delivery_time = get_time_ref_counter(vcpu->kvm); 806 return synic_deliver_msg(to_hv_synic(vcpu), 807 stimer->config.sintx, msg, 808 no_retry); 809 } 810 811 static int stimer_notify_direct(struct kvm_vcpu_hv_stimer *stimer) 812 { 813 struct kvm_vcpu *vcpu = hv_stimer_to_vcpu(stimer); 814 struct kvm_lapic_irq irq = { 815 .delivery_mode = APIC_DM_FIXED, 816 .vector = stimer->config.apic_vector 817 }; 818 819 if (lapic_in_kernel(vcpu)) 820 return !kvm_apic_set_irq(vcpu, &irq, NULL); 821 return 0; 822 } 823 824 static void stimer_expiration(struct kvm_vcpu_hv_stimer *stimer) 825 { 826 int r, direct = stimer->config.direct_mode; 827 828 stimer->msg_pending = true; 829 if (!direct) 830 r = stimer_send_msg(stimer); 831 else 832 r = stimer_notify_direct(stimer); 833 trace_kvm_hv_stimer_expiration(hv_stimer_to_vcpu(stimer)->vcpu_id, 834 stimer->index, direct, r); 835 if (!r) { 836 stimer->msg_pending = false; 837 if (!(stimer->config.periodic)) 838 stimer->config.enable = 0; 839 } 840 } 841 842 void kvm_hv_process_stimers(struct kvm_vcpu *vcpu) 843 { 844 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); 845 struct kvm_vcpu_hv_stimer *stimer; 846 u64 time_now, exp_time; 847 int i; 848 849 if (!hv_vcpu) 850 return; 851 852 for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++) 853 if (test_and_clear_bit(i, hv_vcpu->stimer_pending_bitmap)) { 854 stimer = &hv_vcpu->stimer[i]; 855 if (stimer->config.enable) { 856 exp_time = stimer->exp_time; 857 858 if (exp_time) { 859 time_now = 860 get_time_ref_counter(vcpu->kvm); 861 if (time_now >= exp_time) 862 stimer_expiration(stimer); 863 } 864 865 if ((stimer->config.enable) && 866 stimer->count) { 867 if (!stimer->msg_pending) 868 stimer_start(stimer); 869 } else 870 stimer_cleanup(stimer); 871 } 872 } 873 } 874 875 void kvm_hv_vcpu_uninit(struct kvm_vcpu *vcpu) 876 { 877 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); 878 int i; 879 880 if (!hv_vcpu) 881 return; 882 883 for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++) 884 stimer_cleanup(&hv_vcpu->stimer[i]); 885 886 kfree(hv_vcpu); 887 vcpu->arch.hyperv = NULL; 888 } 889 890 bool kvm_hv_assist_page_enabled(struct kvm_vcpu *vcpu) 891 { 892 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); 893 894 if (!hv_vcpu) 895 return false; 896 897 if (!(hv_vcpu->hv_vapic & HV_X64_MSR_VP_ASSIST_PAGE_ENABLE)) 898 return false; 899 return vcpu->arch.pv_eoi.msr_val & KVM_MSR_ENABLED; 900 } 901 EXPORT_SYMBOL_GPL(kvm_hv_assist_page_enabled); 902 903 int kvm_hv_get_assist_page(struct kvm_vcpu *vcpu) 904 { 905 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); 906 907 if (!hv_vcpu || !kvm_hv_assist_page_enabled(vcpu)) 908 return -EFAULT; 909 910 return kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data, 911 &hv_vcpu->vp_assist_page, sizeof(struct hv_vp_assist_page)); 912 } 913 EXPORT_SYMBOL_GPL(kvm_hv_get_assist_page); 914 915 static void stimer_prepare_msg(struct kvm_vcpu_hv_stimer *stimer) 916 { 917 struct hv_message *msg = &stimer->msg; 918 struct hv_timer_message_payload *payload = 919 (struct hv_timer_message_payload *)&msg->u.payload; 920 921 memset(&msg->header, 0, sizeof(msg->header)); 922 msg->header.message_type = HVMSG_TIMER_EXPIRED; 923 msg->header.payload_size = sizeof(*payload); 924 925 payload->timer_index = stimer->index; 926 payload->expiration_time = 0; 927 payload->delivery_time = 0; 928 } 929 930 static void stimer_init(struct kvm_vcpu_hv_stimer *stimer, int timer_index) 931 { 932 memset(stimer, 0, sizeof(*stimer)); 933 stimer->index = timer_index; 934 hrtimer_init(&stimer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); 935 stimer->timer.function = stimer_timer_callback; 936 stimer_prepare_msg(stimer); 937 } 938 939 int kvm_hv_vcpu_init(struct kvm_vcpu *vcpu) 940 { 941 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); 942 int i; 943 944 if (hv_vcpu) 945 return 0; 946 947 hv_vcpu = kzalloc(sizeof(struct kvm_vcpu_hv), GFP_KERNEL_ACCOUNT); 948 if (!hv_vcpu) 949 return -ENOMEM; 950 951 vcpu->arch.hyperv = hv_vcpu; 952 hv_vcpu->vcpu = vcpu; 953 954 synic_init(&hv_vcpu->synic); 955 956 bitmap_zero(hv_vcpu->stimer_pending_bitmap, HV_SYNIC_STIMER_COUNT); 957 for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++) 958 stimer_init(&hv_vcpu->stimer[i], i); 959 960 hv_vcpu->vp_index = vcpu->vcpu_idx; 961 962 for (i = 0; i < HV_NR_TLB_FLUSH_FIFOS; i++) { 963 INIT_KFIFO(hv_vcpu->tlb_flush_fifo[i].entries); 964 spin_lock_init(&hv_vcpu->tlb_flush_fifo[i].write_lock); 965 } 966 967 return 0; 968 } 969 970 int kvm_hv_activate_synic(struct kvm_vcpu *vcpu, bool dont_zero_synic_pages) 971 { 972 struct kvm_vcpu_hv_synic *synic; 973 int r; 974 975 r = kvm_hv_vcpu_init(vcpu); 976 if (r) 977 return r; 978 979 synic = to_hv_synic(vcpu); 980 981 synic->active = true; 982 synic->dont_zero_synic_pages = dont_zero_synic_pages; 983 synic->control = HV_SYNIC_CONTROL_ENABLE; 984 return 0; 985 } 986 987 static bool kvm_hv_msr_partition_wide(u32 msr) 988 { 989 bool r = false; 990 991 switch (msr) { 992 case HV_X64_MSR_GUEST_OS_ID: 993 case HV_X64_MSR_HYPERCALL: 994 case HV_X64_MSR_REFERENCE_TSC: 995 case HV_X64_MSR_TIME_REF_COUNT: 996 case HV_X64_MSR_CRASH_CTL: 997 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4: 998 case HV_X64_MSR_RESET: 999 case HV_X64_MSR_REENLIGHTENMENT_CONTROL: 1000 case HV_X64_MSR_TSC_EMULATION_CONTROL: 1001 case HV_X64_MSR_TSC_EMULATION_STATUS: 1002 case HV_X64_MSR_SYNDBG_OPTIONS: 1003 case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER: 1004 r = true; 1005 break; 1006 } 1007 1008 return r; 1009 } 1010 1011 static int kvm_hv_msr_get_crash_data(struct kvm *kvm, u32 index, u64 *pdata) 1012 { 1013 struct kvm_hv *hv = to_kvm_hv(kvm); 1014 size_t size = ARRAY_SIZE(hv->hv_crash_param); 1015 1016 if (WARN_ON_ONCE(index >= size)) 1017 return -EINVAL; 1018 1019 *pdata = hv->hv_crash_param[array_index_nospec(index, size)]; 1020 return 0; 1021 } 1022 1023 static int kvm_hv_msr_get_crash_ctl(struct kvm *kvm, u64 *pdata) 1024 { 1025 struct kvm_hv *hv = to_kvm_hv(kvm); 1026 1027 *pdata = hv->hv_crash_ctl; 1028 return 0; 1029 } 1030 1031 static int kvm_hv_msr_set_crash_ctl(struct kvm *kvm, u64 data) 1032 { 1033 struct kvm_hv *hv = to_kvm_hv(kvm); 1034 1035 hv->hv_crash_ctl = data & HV_CRASH_CTL_CRASH_NOTIFY; 1036 1037 return 0; 1038 } 1039 1040 static int kvm_hv_msr_set_crash_data(struct kvm *kvm, u32 index, u64 data) 1041 { 1042 struct kvm_hv *hv = to_kvm_hv(kvm); 1043 size_t size = ARRAY_SIZE(hv->hv_crash_param); 1044 1045 if (WARN_ON_ONCE(index >= size)) 1046 return -EINVAL; 1047 1048 hv->hv_crash_param[array_index_nospec(index, size)] = data; 1049 return 0; 1050 } 1051 1052 /* 1053 * The kvmclock and Hyper-V TSC page use similar formulas, and converting 1054 * between them is possible: 1055 * 1056 * kvmclock formula: 1057 * nsec = (ticks - tsc_timestamp) * tsc_to_system_mul * 2^(tsc_shift-32) 1058 * + system_time 1059 * 1060 * Hyper-V formula: 1061 * nsec/100 = ticks * scale / 2^64 + offset 1062 * 1063 * When tsc_timestamp = system_time = 0, offset is zero in the Hyper-V formula. 1064 * By dividing the kvmclock formula by 100 and equating what's left we get: 1065 * ticks * scale / 2^64 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100 1066 * scale / 2^64 = tsc_to_system_mul * 2^(tsc_shift-32) / 100 1067 * scale = tsc_to_system_mul * 2^(32+tsc_shift) / 100 1068 * 1069 * Now expand the kvmclock formula and divide by 100: 1070 * nsec = ticks * tsc_to_system_mul * 2^(tsc_shift-32) 1071 * - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32) 1072 * + system_time 1073 * nsec/100 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100 1074 * - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32) / 100 1075 * + system_time / 100 1076 * 1077 * Replace tsc_to_system_mul * 2^(tsc_shift-32) / 100 by scale / 2^64: 1078 * nsec/100 = ticks * scale / 2^64 1079 * - tsc_timestamp * scale / 2^64 1080 * + system_time / 100 1081 * 1082 * Equate with the Hyper-V formula so that ticks * scale / 2^64 cancels out: 1083 * offset = system_time / 100 - tsc_timestamp * scale / 2^64 1084 * 1085 * These two equivalencies are implemented in this function. 1086 */ 1087 static bool compute_tsc_page_parameters(struct pvclock_vcpu_time_info *hv_clock, 1088 struct ms_hyperv_tsc_page *tsc_ref) 1089 { 1090 u64 max_mul; 1091 1092 if (!(hv_clock->flags & PVCLOCK_TSC_STABLE_BIT)) 1093 return false; 1094 1095 /* 1096 * check if scale would overflow, if so we use the time ref counter 1097 * tsc_to_system_mul * 2^(tsc_shift+32) / 100 >= 2^64 1098 * tsc_to_system_mul / 100 >= 2^(32-tsc_shift) 1099 * tsc_to_system_mul >= 100 * 2^(32-tsc_shift) 1100 */ 1101 max_mul = 100ull << (32 - hv_clock->tsc_shift); 1102 if (hv_clock->tsc_to_system_mul >= max_mul) 1103 return false; 1104 1105 /* 1106 * Otherwise compute the scale and offset according to the formulas 1107 * derived above. 1108 */ 1109 tsc_ref->tsc_scale = 1110 mul_u64_u32_div(1ULL << (32 + hv_clock->tsc_shift), 1111 hv_clock->tsc_to_system_mul, 1112 100); 1113 1114 tsc_ref->tsc_offset = hv_clock->system_time; 1115 do_div(tsc_ref->tsc_offset, 100); 1116 tsc_ref->tsc_offset -= 1117 mul_u64_u64_shr(hv_clock->tsc_timestamp, tsc_ref->tsc_scale, 64); 1118 return true; 1119 } 1120 1121 /* 1122 * Don't touch TSC page values if the guest has opted for TSC emulation after 1123 * migration. KVM doesn't fully support reenlightenment notifications and TSC 1124 * access emulation and Hyper-V is known to expect the values in TSC page to 1125 * stay constant before TSC access emulation is disabled from guest side 1126 * (HV_X64_MSR_TSC_EMULATION_STATUS). KVM userspace is expected to preserve TSC 1127 * frequency and guest visible TSC value across migration (and prevent it when 1128 * TSC scaling is unsupported). 1129 */ 1130 static inline bool tsc_page_update_unsafe(struct kvm_hv *hv) 1131 { 1132 return (hv->hv_tsc_page_status != HV_TSC_PAGE_GUEST_CHANGED) && 1133 hv->hv_tsc_emulation_control; 1134 } 1135 1136 void kvm_hv_setup_tsc_page(struct kvm *kvm, 1137 struct pvclock_vcpu_time_info *hv_clock) 1138 { 1139 struct kvm_hv *hv = to_kvm_hv(kvm); 1140 u32 tsc_seq; 1141 u64 gfn; 1142 1143 BUILD_BUG_ON(sizeof(tsc_seq) != sizeof(hv->tsc_ref.tsc_sequence)); 1144 BUILD_BUG_ON(offsetof(struct ms_hyperv_tsc_page, tsc_sequence) != 0); 1145 1146 mutex_lock(&hv->hv_lock); 1147 1148 if (hv->hv_tsc_page_status == HV_TSC_PAGE_BROKEN || 1149 hv->hv_tsc_page_status == HV_TSC_PAGE_SET || 1150 hv->hv_tsc_page_status == HV_TSC_PAGE_UNSET) 1151 goto out_unlock; 1152 1153 if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE)) 1154 goto out_unlock; 1155 1156 gfn = hv->hv_tsc_page >> HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT; 1157 /* 1158 * Because the TSC parameters only vary when there is a 1159 * change in the master clock, do not bother with caching. 1160 */ 1161 if (unlikely(kvm_read_guest(kvm, gfn_to_gpa(gfn), 1162 &tsc_seq, sizeof(tsc_seq)))) 1163 goto out_err; 1164 1165 if (tsc_seq && tsc_page_update_unsafe(hv)) { 1166 if (kvm_read_guest(kvm, gfn_to_gpa(gfn), &hv->tsc_ref, sizeof(hv->tsc_ref))) 1167 goto out_err; 1168 1169 hv->hv_tsc_page_status = HV_TSC_PAGE_SET; 1170 goto out_unlock; 1171 } 1172 1173 /* 1174 * While we're computing and writing the parameters, force the 1175 * guest to use the time reference count MSR. 1176 */ 1177 hv->tsc_ref.tsc_sequence = 0; 1178 if (kvm_write_guest(kvm, gfn_to_gpa(gfn), 1179 &hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence))) 1180 goto out_err; 1181 1182 if (!compute_tsc_page_parameters(hv_clock, &hv->tsc_ref)) 1183 goto out_err; 1184 1185 /* Ensure sequence is zero before writing the rest of the struct. */ 1186 smp_wmb(); 1187 if (kvm_write_guest(kvm, gfn_to_gpa(gfn), &hv->tsc_ref, sizeof(hv->tsc_ref))) 1188 goto out_err; 1189 1190 /* 1191 * Now switch to the TSC page mechanism by writing the sequence. 1192 */ 1193 tsc_seq++; 1194 if (tsc_seq == 0xFFFFFFFF || tsc_seq == 0) 1195 tsc_seq = 1; 1196 1197 /* Write the struct entirely before the non-zero sequence. */ 1198 smp_wmb(); 1199 1200 hv->tsc_ref.tsc_sequence = tsc_seq; 1201 if (kvm_write_guest(kvm, gfn_to_gpa(gfn), 1202 &hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence))) 1203 goto out_err; 1204 1205 hv->hv_tsc_page_status = HV_TSC_PAGE_SET; 1206 goto out_unlock; 1207 1208 out_err: 1209 hv->hv_tsc_page_status = HV_TSC_PAGE_BROKEN; 1210 out_unlock: 1211 mutex_unlock(&hv->hv_lock); 1212 } 1213 1214 void kvm_hv_request_tsc_page_update(struct kvm *kvm) 1215 { 1216 struct kvm_hv *hv = to_kvm_hv(kvm); 1217 1218 mutex_lock(&hv->hv_lock); 1219 1220 if (hv->hv_tsc_page_status == HV_TSC_PAGE_SET && 1221 !tsc_page_update_unsafe(hv)) 1222 hv->hv_tsc_page_status = HV_TSC_PAGE_HOST_CHANGED; 1223 1224 mutex_unlock(&hv->hv_lock); 1225 } 1226 1227 static bool hv_check_msr_access(struct kvm_vcpu_hv *hv_vcpu, u32 msr) 1228 { 1229 if (!hv_vcpu->enforce_cpuid) 1230 return true; 1231 1232 switch (msr) { 1233 case HV_X64_MSR_GUEST_OS_ID: 1234 case HV_X64_MSR_HYPERCALL: 1235 return hv_vcpu->cpuid_cache.features_eax & 1236 HV_MSR_HYPERCALL_AVAILABLE; 1237 case HV_X64_MSR_VP_RUNTIME: 1238 return hv_vcpu->cpuid_cache.features_eax & 1239 HV_MSR_VP_RUNTIME_AVAILABLE; 1240 case HV_X64_MSR_TIME_REF_COUNT: 1241 return hv_vcpu->cpuid_cache.features_eax & 1242 HV_MSR_TIME_REF_COUNT_AVAILABLE; 1243 case HV_X64_MSR_VP_INDEX: 1244 return hv_vcpu->cpuid_cache.features_eax & 1245 HV_MSR_VP_INDEX_AVAILABLE; 1246 case HV_X64_MSR_RESET: 1247 return hv_vcpu->cpuid_cache.features_eax & 1248 HV_MSR_RESET_AVAILABLE; 1249 case HV_X64_MSR_REFERENCE_TSC: 1250 return hv_vcpu->cpuid_cache.features_eax & 1251 HV_MSR_REFERENCE_TSC_AVAILABLE; 1252 case HV_X64_MSR_SCONTROL: 1253 case HV_X64_MSR_SVERSION: 1254 case HV_X64_MSR_SIEFP: 1255 case HV_X64_MSR_SIMP: 1256 case HV_X64_MSR_EOM: 1257 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15: 1258 return hv_vcpu->cpuid_cache.features_eax & 1259 HV_MSR_SYNIC_AVAILABLE; 1260 case HV_X64_MSR_STIMER0_CONFIG: 1261 case HV_X64_MSR_STIMER1_CONFIG: 1262 case HV_X64_MSR_STIMER2_CONFIG: 1263 case HV_X64_MSR_STIMER3_CONFIG: 1264 case HV_X64_MSR_STIMER0_COUNT: 1265 case HV_X64_MSR_STIMER1_COUNT: 1266 case HV_X64_MSR_STIMER2_COUNT: 1267 case HV_X64_MSR_STIMER3_COUNT: 1268 return hv_vcpu->cpuid_cache.features_eax & 1269 HV_MSR_SYNTIMER_AVAILABLE; 1270 case HV_X64_MSR_EOI: 1271 case HV_X64_MSR_ICR: 1272 case HV_X64_MSR_TPR: 1273 case HV_X64_MSR_VP_ASSIST_PAGE: 1274 return hv_vcpu->cpuid_cache.features_eax & 1275 HV_MSR_APIC_ACCESS_AVAILABLE; 1276 break; 1277 case HV_X64_MSR_TSC_FREQUENCY: 1278 case HV_X64_MSR_APIC_FREQUENCY: 1279 return hv_vcpu->cpuid_cache.features_eax & 1280 HV_ACCESS_FREQUENCY_MSRS; 1281 case HV_X64_MSR_REENLIGHTENMENT_CONTROL: 1282 case HV_X64_MSR_TSC_EMULATION_CONTROL: 1283 case HV_X64_MSR_TSC_EMULATION_STATUS: 1284 return hv_vcpu->cpuid_cache.features_eax & 1285 HV_ACCESS_REENLIGHTENMENT; 1286 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4: 1287 case HV_X64_MSR_CRASH_CTL: 1288 return hv_vcpu->cpuid_cache.features_edx & 1289 HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE; 1290 case HV_X64_MSR_SYNDBG_OPTIONS: 1291 case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER: 1292 return hv_vcpu->cpuid_cache.features_edx & 1293 HV_FEATURE_DEBUG_MSRS_AVAILABLE; 1294 default: 1295 break; 1296 } 1297 1298 return false; 1299 } 1300 1301 static int kvm_hv_set_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data, 1302 bool host) 1303 { 1304 struct kvm *kvm = vcpu->kvm; 1305 struct kvm_hv *hv = to_kvm_hv(kvm); 1306 1307 if (unlikely(!host && !hv_check_msr_access(to_hv_vcpu(vcpu), msr))) 1308 return 1; 1309 1310 switch (msr) { 1311 case HV_X64_MSR_GUEST_OS_ID: 1312 hv->hv_guest_os_id = data; 1313 /* setting guest os id to zero disables hypercall page */ 1314 if (!hv->hv_guest_os_id) 1315 hv->hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE; 1316 break; 1317 case HV_X64_MSR_HYPERCALL: { 1318 u8 instructions[9]; 1319 int i = 0; 1320 u64 addr; 1321 1322 /* if guest os id is not set hypercall should remain disabled */ 1323 if (!hv->hv_guest_os_id) 1324 break; 1325 if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) { 1326 hv->hv_hypercall = data; 1327 break; 1328 } 1329 1330 /* 1331 * If Xen and Hyper-V hypercalls are both enabled, disambiguate 1332 * the same way Xen itself does, by setting the bit 31 of EAX 1333 * which is RsvdZ in the 32-bit Hyper-V hypercall ABI and just 1334 * going to be clobbered on 64-bit. 1335 */ 1336 if (kvm_xen_hypercall_enabled(kvm)) { 1337 /* orl $0x80000000, %eax */ 1338 instructions[i++] = 0x0d; 1339 instructions[i++] = 0x00; 1340 instructions[i++] = 0x00; 1341 instructions[i++] = 0x00; 1342 instructions[i++] = 0x80; 1343 } 1344 1345 /* vmcall/vmmcall */ 1346 static_call(kvm_x86_patch_hypercall)(vcpu, instructions + i); 1347 i += 3; 1348 1349 /* ret */ 1350 ((unsigned char *)instructions)[i++] = 0xc3; 1351 1352 addr = data & HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_MASK; 1353 if (kvm_vcpu_write_guest(vcpu, addr, instructions, i)) 1354 return 1; 1355 hv->hv_hypercall = data; 1356 break; 1357 } 1358 case HV_X64_MSR_REFERENCE_TSC: 1359 hv->hv_tsc_page = data; 1360 if (hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE) { 1361 if (!host) 1362 hv->hv_tsc_page_status = HV_TSC_PAGE_GUEST_CHANGED; 1363 else 1364 hv->hv_tsc_page_status = HV_TSC_PAGE_HOST_CHANGED; 1365 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu); 1366 } else { 1367 hv->hv_tsc_page_status = HV_TSC_PAGE_UNSET; 1368 } 1369 break; 1370 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4: 1371 return kvm_hv_msr_set_crash_data(kvm, 1372 msr - HV_X64_MSR_CRASH_P0, 1373 data); 1374 case HV_X64_MSR_CRASH_CTL: 1375 if (host) 1376 return kvm_hv_msr_set_crash_ctl(kvm, data); 1377 1378 if (data & HV_CRASH_CTL_CRASH_NOTIFY) { 1379 vcpu_debug(vcpu, "hv crash (0x%llx 0x%llx 0x%llx 0x%llx 0x%llx)\n", 1380 hv->hv_crash_param[0], 1381 hv->hv_crash_param[1], 1382 hv->hv_crash_param[2], 1383 hv->hv_crash_param[3], 1384 hv->hv_crash_param[4]); 1385 1386 /* Send notification about crash to user space */ 1387 kvm_make_request(KVM_REQ_HV_CRASH, vcpu); 1388 } 1389 break; 1390 case HV_X64_MSR_RESET: 1391 if (data == 1) { 1392 vcpu_debug(vcpu, "hyper-v reset requested\n"); 1393 kvm_make_request(KVM_REQ_HV_RESET, vcpu); 1394 } 1395 break; 1396 case HV_X64_MSR_REENLIGHTENMENT_CONTROL: 1397 hv->hv_reenlightenment_control = data; 1398 break; 1399 case HV_X64_MSR_TSC_EMULATION_CONTROL: 1400 hv->hv_tsc_emulation_control = data; 1401 break; 1402 case HV_X64_MSR_TSC_EMULATION_STATUS: 1403 if (data && !host) 1404 return 1; 1405 1406 hv->hv_tsc_emulation_status = data; 1407 break; 1408 case HV_X64_MSR_TIME_REF_COUNT: 1409 /* read-only, but still ignore it if host-initiated */ 1410 if (!host) 1411 return 1; 1412 break; 1413 case HV_X64_MSR_SYNDBG_OPTIONS: 1414 case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER: 1415 return syndbg_set_msr(vcpu, msr, data, host); 1416 default: 1417 vcpu_unimpl(vcpu, "Hyper-V unhandled wrmsr: 0x%x data 0x%llx\n", 1418 msr, data); 1419 return 1; 1420 } 1421 return 0; 1422 } 1423 1424 /* Calculate cpu time spent by current task in 100ns units */ 1425 static u64 current_task_runtime_100ns(void) 1426 { 1427 u64 utime, stime; 1428 1429 task_cputime_adjusted(current, &utime, &stime); 1430 1431 return div_u64(utime + stime, 100); 1432 } 1433 1434 static int kvm_hv_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host) 1435 { 1436 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); 1437 1438 if (unlikely(!host && !hv_check_msr_access(hv_vcpu, msr))) 1439 return 1; 1440 1441 switch (msr) { 1442 case HV_X64_MSR_VP_INDEX: { 1443 struct kvm_hv *hv = to_kvm_hv(vcpu->kvm); 1444 u32 new_vp_index = (u32)data; 1445 1446 if (!host || new_vp_index >= KVM_MAX_VCPUS) 1447 return 1; 1448 1449 if (new_vp_index == hv_vcpu->vp_index) 1450 return 0; 1451 1452 /* 1453 * The VP index is initialized to vcpu_index by 1454 * kvm_hv_vcpu_postcreate so they initially match. Now the 1455 * VP index is changing, adjust num_mismatched_vp_indexes if 1456 * it now matches or no longer matches vcpu_idx. 1457 */ 1458 if (hv_vcpu->vp_index == vcpu->vcpu_idx) 1459 atomic_inc(&hv->num_mismatched_vp_indexes); 1460 else if (new_vp_index == vcpu->vcpu_idx) 1461 atomic_dec(&hv->num_mismatched_vp_indexes); 1462 1463 hv_vcpu->vp_index = new_vp_index; 1464 break; 1465 } 1466 case HV_X64_MSR_VP_ASSIST_PAGE: { 1467 u64 gfn; 1468 unsigned long addr; 1469 1470 if (!(data & HV_X64_MSR_VP_ASSIST_PAGE_ENABLE)) { 1471 hv_vcpu->hv_vapic = data; 1472 if (kvm_lapic_set_pv_eoi(vcpu, 0, 0)) 1473 return 1; 1474 break; 1475 } 1476 gfn = data >> HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_SHIFT; 1477 addr = kvm_vcpu_gfn_to_hva(vcpu, gfn); 1478 if (kvm_is_error_hva(addr)) 1479 return 1; 1480 1481 /* 1482 * Clear apic_assist portion of struct hv_vp_assist_page 1483 * only, there can be valuable data in the rest which needs 1484 * to be preserved e.g. on migration. 1485 */ 1486 if (__put_user(0, (u32 __user *)addr)) 1487 return 1; 1488 hv_vcpu->hv_vapic = data; 1489 kvm_vcpu_mark_page_dirty(vcpu, gfn); 1490 if (kvm_lapic_set_pv_eoi(vcpu, 1491 gfn_to_gpa(gfn) | KVM_MSR_ENABLED, 1492 sizeof(struct hv_vp_assist_page))) 1493 return 1; 1494 break; 1495 } 1496 case HV_X64_MSR_EOI: 1497 return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data); 1498 case HV_X64_MSR_ICR: 1499 return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data); 1500 case HV_X64_MSR_TPR: 1501 return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data); 1502 case HV_X64_MSR_VP_RUNTIME: 1503 if (!host) 1504 return 1; 1505 hv_vcpu->runtime_offset = data - current_task_runtime_100ns(); 1506 break; 1507 case HV_X64_MSR_SCONTROL: 1508 case HV_X64_MSR_SVERSION: 1509 case HV_X64_MSR_SIEFP: 1510 case HV_X64_MSR_SIMP: 1511 case HV_X64_MSR_EOM: 1512 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15: 1513 return synic_set_msr(to_hv_synic(vcpu), msr, data, host); 1514 case HV_X64_MSR_STIMER0_CONFIG: 1515 case HV_X64_MSR_STIMER1_CONFIG: 1516 case HV_X64_MSR_STIMER2_CONFIG: 1517 case HV_X64_MSR_STIMER3_CONFIG: { 1518 int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2; 1519 1520 return stimer_set_config(to_hv_stimer(vcpu, timer_index), 1521 data, host); 1522 } 1523 case HV_X64_MSR_STIMER0_COUNT: 1524 case HV_X64_MSR_STIMER1_COUNT: 1525 case HV_X64_MSR_STIMER2_COUNT: 1526 case HV_X64_MSR_STIMER3_COUNT: { 1527 int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2; 1528 1529 return stimer_set_count(to_hv_stimer(vcpu, timer_index), 1530 data, host); 1531 } 1532 case HV_X64_MSR_TSC_FREQUENCY: 1533 case HV_X64_MSR_APIC_FREQUENCY: 1534 /* read-only, but still ignore it if host-initiated */ 1535 if (!host) 1536 return 1; 1537 break; 1538 default: 1539 vcpu_unimpl(vcpu, "Hyper-V unhandled wrmsr: 0x%x data 0x%llx\n", 1540 msr, data); 1541 return 1; 1542 } 1543 1544 return 0; 1545 } 1546 1547 static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, 1548 bool host) 1549 { 1550 u64 data = 0; 1551 struct kvm *kvm = vcpu->kvm; 1552 struct kvm_hv *hv = to_kvm_hv(kvm); 1553 1554 if (unlikely(!host && !hv_check_msr_access(to_hv_vcpu(vcpu), msr))) 1555 return 1; 1556 1557 switch (msr) { 1558 case HV_X64_MSR_GUEST_OS_ID: 1559 data = hv->hv_guest_os_id; 1560 break; 1561 case HV_X64_MSR_HYPERCALL: 1562 data = hv->hv_hypercall; 1563 break; 1564 case HV_X64_MSR_TIME_REF_COUNT: 1565 data = get_time_ref_counter(kvm); 1566 break; 1567 case HV_X64_MSR_REFERENCE_TSC: 1568 data = hv->hv_tsc_page; 1569 break; 1570 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4: 1571 return kvm_hv_msr_get_crash_data(kvm, 1572 msr - HV_X64_MSR_CRASH_P0, 1573 pdata); 1574 case HV_X64_MSR_CRASH_CTL: 1575 return kvm_hv_msr_get_crash_ctl(kvm, pdata); 1576 case HV_X64_MSR_RESET: 1577 data = 0; 1578 break; 1579 case HV_X64_MSR_REENLIGHTENMENT_CONTROL: 1580 data = hv->hv_reenlightenment_control; 1581 break; 1582 case HV_X64_MSR_TSC_EMULATION_CONTROL: 1583 data = hv->hv_tsc_emulation_control; 1584 break; 1585 case HV_X64_MSR_TSC_EMULATION_STATUS: 1586 data = hv->hv_tsc_emulation_status; 1587 break; 1588 case HV_X64_MSR_SYNDBG_OPTIONS: 1589 case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER: 1590 return syndbg_get_msr(vcpu, msr, pdata, host); 1591 default: 1592 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr); 1593 return 1; 1594 } 1595 1596 *pdata = data; 1597 return 0; 1598 } 1599 1600 static int kvm_hv_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, 1601 bool host) 1602 { 1603 u64 data = 0; 1604 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); 1605 1606 if (unlikely(!host && !hv_check_msr_access(hv_vcpu, msr))) 1607 return 1; 1608 1609 switch (msr) { 1610 case HV_X64_MSR_VP_INDEX: 1611 data = hv_vcpu->vp_index; 1612 break; 1613 case HV_X64_MSR_EOI: 1614 return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata); 1615 case HV_X64_MSR_ICR: 1616 return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata); 1617 case HV_X64_MSR_TPR: 1618 return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata); 1619 case HV_X64_MSR_VP_ASSIST_PAGE: 1620 data = hv_vcpu->hv_vapic; 1621 break; 1622 case HV_X64_MSR_VP_RUNTIME: 1623 data = current_task_runtime_100ns() + hv_vcpu->runtime_offset; 1624 break; 1625 case HV_X64_MSR_SCONTROL: 1626 case HV_X64_MSR_SVERSION: 1627 case HV_X64_MSR_SIEFP: 1628 case HV_X64_MSR_SIMP: 1629 case HV_X64_MSR_EOM: 1630 case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15: 1631 return synic_get_msr(to_hv_synic(vcpu), msr, pdata, host); 1632 case HV_X64_MSR_STIMER0_CONFIG: 1633 case HV_X64_MSR_STIMER1_CONFIG: 1634 case HV_X64_MSR_STIMER2_CONFIG: 1635 case HV_X64_MSR_STIMER3_CONFIG: { 1636 int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2; 1637 1638 return stimer_get_config(to_hv_stimer(vcpu, timer_index), 1639 pdata); 1640 } 1641 case HV_X64_MSR_STIMER0_COUNT: 1642 case HV_X64_MSR_STIMER1_COUNT: 1643 case HV_X64_MSR_STIMER2_COUNT: 1644 case HV_X64_MSR_STIMER3_COUNT: { 1645 int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2; 1646 1647 return stimer_get_count(to_hv_stimer(vcpu, timer_index), 1648 pdata); 1649 } 1650 case HV_X64_MSR_TSC_FREQUENCY: 1651 data = (u64)vcpu->arch.virtual_tsc_khz * 1000; 1652 break; 1653 case HV_X64_MSR_APIC_FREQUENCY: 1654 data = APIC_BUS_FREQUENCY; 1655 break; 1656 default: 1657 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr); 1658 return 1; 1659 } 1660 *pdata = data; 1661 return 0; 1662 } 1663 1664 int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host) 1665 { 1666 struct kvm_hv *hv = to_kvm_hv(vcpu->kvm); 1667 1668 if (!host && !vcpu->arch.hyperv_enabled) 1669 return 1; 1670 1671 if (kvm_hv_vcpu_init(vcpu)) 1672 return 1; 1673 1674 if (kvm_hv_msr_partition_wide(msr)) { 1675 int r; 1676 1677 mutex_lock(&hv->hv_lock); 1678 r = kvm_hv_set_msr_pw(vcpu, msr, data, host); 1679 mutex_unlock(&hv->hv_lock); 1680 return r; 1681 } else 1682 return kvm_hv_set_msr(vcpu, msr, data, host); 1683 } 1684 1685 int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host) 1686 { 1687 struct kvm_hv *hv = to_kvm_hv(vcpu->kvm); 1688 1689 if (!host && !vcpu->arch.hyperv_enabled) 1690 return 1; 1691 1692 if (kvm_hv_vcpu_init(vcpu)) 1693 return 1; 1694 1695 if (kvm_hv_msr_partition_wide(msr)) { 1696 int r; 1697 1698 mutex_lock(&hv->hv_lock); 1699 r = kvm_hv_get_msr_pw(vcpu, msr, pdata, host); 1700 mutex_unlock(&hv->hv_lock); 1701 return r; 1702 } else 1703 return kvm_hv_get_msr(vcpu, msr, pdata, host); 1704 } 1705 1706 static void sparse_set_to_vcpu_mask(struct kvm *kvm, u64 *sparse_banks, 1707 u64 valid_bank_mask, unsigned long *vcpu_mask) 1708 { 1709 struct kvm_hv *hv = to_kvm_hv(kvm); 1710 bool has_mismatch = atomic_read(&hv->num_mismatched_vp_indexes); 1711 u64 vp_bitmap[KVM_HV_MAX_SPARSE_VCPU_SET_BITS]; 1712 struct kvm_vcpu *vcpu; 1713 int bank, sbank = 0; 1714 unsigned long i; 1715 u64 *bitmap; 1716 1717 BUILD_BUG_ON(sizeof(vp_bitmap) > 1718 sizeof(*vcpu_mask) * BITS_TO_LONGS(KVM_MAX_VCPUS)); 1719 1720 /* 1721 * If vp_index == vcpu_idx for all vCPUs, fill vcpu_mask directly, else 1722 * fill a temporary buffer and manually test each vCPU's VP index. 1723 */ 1724 if (likely(!has_mismatch)) 1725 bitmap = (u64 *)vcpu_mask; 1726 else 1727 bitmap = vp_bitmap; 1728 1729 /* 1730 * Each set of 64 VPs is packed into sparse_banks, with valid_bank_mask 1731 * having a '1' for each bank that exists in sparse_banks. Sets must 1732 * be in ascending order, i.e. bank0..bankN. 1733 */ 1734 memset(bitmap, 0, sizeof(vp_bitmap)); 1735 for_each_set_bit(bank, (unsigned long *)&valid_bank_mask, 1736 KVM_HV_MAX_SPARSE_VCPU_SET_BITS) 1737 bitmap[bank] = sparse_banks[sbank++]; 1738 1739 if (likely(!has_mismatch)) 1740 return; 1741 1742 bitmap_zero(vcpu_mask, KVM_MAX_VCPUS); 1743 kvm_for_each_vcpu(i, vcpu, kvm) { 1744 if (test_bit(kvm_hv_get_vpindex(vcpu), (unsigned long *)vp_bitmap)) 1745 __set_bit(i, vcpu_mask); 1746 } 1747 } 1748 1749 static bool hv_is_vp_in_sparse_set(u32 vp_id, u64 valid_bank_mask, u64 sparse_banks[]) 1750 { 1751 int valid_bit_nr = vp_id / HV_VCPUS_PER_SPARSE_BANK; 1752 unsigned long sbank; 1753 1754 if (!test_bit(valid_bit_nr, (unsigned long *)&valid_bank_mask)) 1755 return false; 1756 1757 /* 1758 * The index into the sparse bank is the number of preceding bits in 1759 * the valid mask. Optimize for VMs with <64 vCPUs by skipping the 1760 * fancy math if there can't possibly be preceding bits. 1761 */ 1762 if (valid_bit_nr) 1763 sbank = hweight64(valid_bank_mask & GENMASK_ULL(valid_bit_nr - 1, 0)); 1764 else 1765 sbank = 0; 1766 1767 return test_bit(vp_id % HV_VCPUS_PER_SPARSE_BANK, 1768 (unsigned long *)&sparse_banks[sbank]); 1769 } 1770 1771 struct kvm_hv_hcall { 1772 /* Hypercall input data */ 1773 u64 param; 1774 u64 ingpa; 1775 u64 outgpa; 1776 u16 code; 1777 u16 var_cnt; 1778 u16 rep_cnt; 1779 u16 rep_idx; 1780 bool fast; 1781 bool rep; 1782 sse128_t xmm[HV_HYPERCALL_MAX_XMM_REGISTERS]; 1783 1784 /* 1785 * Current read offset when KVM reads hypercall input data gradually, 1786 * either offset in bytes from 'ingpa' for regular hypercalls or the 1787 * number of already consumed 'XMM halves' for 'fast' hypercalls. 1788 */ 1789 union { 1790 gpa_t data_offset; 1791 int consumed_xmm_halves; 1792 }; 1793 }; 1794 1795 1796 static int kvm_hv_get_hc_data(struct kvm *kvm, struct kvm_hv_hcall *hc, 1797 u16 orig_cnt, u16 cnt_cap, u64 *data) 1798 { 1799 /* 1800 * Preserve the original count when ignoring entries via a "cap", KVM 1801 * still needs to validate the guest input (though the non-XMM path 1802 * punts on the checks). 1803 */ 1804 u16 cnt = min(orig_cnt, cnt_cap); 1805 int i, j; 1806 1807 if (hc->fast) { 1808 /* 1809 * Each XMM holds two sparse banks, but do not count halves that 1810 * have already been consumed for hypercall parameters. 1811 */ 1812 if (orig_cnt > 2 * HV_HYPERCALL_MAX_XMM_REGISTERS - hc->consumed_xmm_halves) 1813 return HV_STATUS_INVALID_HYPERCALL_INPUT; 1814 1815 for (i = 0; i < cnt; i++) { 1816 j = i + hc->consumed_xmm_halves; 1817 if (j % 2) 1818 data[i] = sse128_hi(hc->xmm[j / 2]); 1819 else 1820 data[i] = sse128_lo(hc->xmm[j / 2]); 1821 } 1822 return 0; 1823 } 1824 1825 return kvm_read_guest(kvm, hc->ingpa + hc->data_offset, data, 1826 cnt * sizeof(*data)); 1827 } 1828 1829 static u64 kvm_get_sparse_vp_set(struct kvm *kvm, struct kvm_hv_hcall *hc, 1830 u64 *sparse_banks) 1831 { 1832 if (hc->var_cnt > HV_MAX_SPARSE_VCPU_BANKS) 1833 return -EINVAL; 1834 1835 /* Cap var_cnt to ignore banks that cannot contain a legal VP index. */ 1836 return kvm_hv_get_hc_data(kvm, hc, hc->var_cnt, KVM_HV_MAX_SPARSE_VCPU_SET_BITS, 1837 sparse_banks); 1838 } 1839 1840 static int kvm_hv_get_tlb_flush_entries(struct kvm *kvm, struct kvm_hv_hcall *hc, u64 entries[]) 1841 { 1842 return kvm_hv_get_hc_data(kvm, hc, hc->rep_cnt, hc->rep_cnt, entries); 1843 } 1844 1845 static void hv_tlb_flush_enqueue(struct kvm_vcpu *vcpu, 1846 struct kvm_vcpu_hv_tlb_flush_fifo *tlb_flush_fifo, 1847 u64 *entries, int count) 1848 { 1849 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); 1850 u64 flush_all_entry = KVM_HV_TLB_FLUSHALL_ENTRY; 1851 1852 if (!hv_vcpu) 1853 return; 1854 1855 spin_lock(&tlb_flush_fifo->write_lock); 1856 1857 /* 1858 * All entries should fit on the fifo leaving one free for 'flush all' 1859 * entry in case another request comes in. In case there's not enough 1860 * space, just put 'flush all' entry there. 1861 */ 1862 if (count && entries && count < kfifo_avail(&tlb_flush_fifo->entries)) { 1863 WARN_ON(kfifo_in(&tlb_flush_fifo->entries, entries, count) != count); 1864 goto out_unlock; 1865 } 1866 1867 /* 1868 * Note: full fifo always contains 'flush all' entry, no need to check the 1869 * return value. 1870 */ 1871 kfifo_in(&tlb_flush_fifo->entries, &flush_all_entry, 1); 1872 1873 out_unlock: 1874 spin_unlock(&tlb_flush_fifo->write_lock); 1875 } 1876 1877 int kvm_hv_vcpu_flush_tlb(struct kvm_vcpu *vcpu) 1878 { 1879 struct kvm_vcpu_hv_tlb_flush_fifo *tlb_flush_fifo; 1880 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); 1881 u64 entries[KVM_HV_TLB_FLUSH_FIFO_SIZE]; 1882 int i, j, count; 1883 gva_t gva; 1884 1885 if (!tdp_enabled || !hv_vcpu) 1886 return -EINVAL; 1887 1888 tlb_flush_fifo = kvm_hv_get_tlb_flush_fifo(vcpu, is_guest_mode(vcpu)); 1889 1890 count = kfifo_out(&tlb_flush_fifo->entries, entries, KVM_HV_TLB_FLUSH_FIFO_SIZE); 1891 1892 for (i = 0; i < count; i++) { 1893 if (entries[i] == KVM_HV_TLB_FLUSHALL_ENTRY) 1894 goto out_flush_all; 1895 1896 /* 1897 * Lower 12 bits of 'address' encode the number of additional 1898 * pages to flush. 1899 */ 1900 gva = entries[i] & PAGE_MASK; 1901 for (j = 0; j < (entries[i] & ~PAGE_MASK) + 1; j++) 1902 static_call(kvm_x86_flush_tlb_gva)(vcpu, gva + j * PAGE_SIZE); 1903 1904 ++vcpu->stat.tlb_flush; 1905 } 1906 return 0; 1907 1908 out_flush_all: 1909 kfifo_reset_out(&tlb_flush_fifo->entries); 1910 1911 /* Fall back to full flush. */ 1912 return -ENOSPC; 1913 } 1914 1915 static u64 kvm_hv_flush_tlb(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc) 1916 { 1917 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); 1918 u64 *sparse_banks = hv_vcpu->sparse_banks; 1919 struct kvm *kvm = vcpu->kvm; 1920 struct hv_tlb_flush_ex flush_ex; 1921 struct hv_tlb_flush flush; 1922 DECLARE_BITMAP(vcpu_mask, KVM_MAX_VCPUS); 1923 struct kvm_vcpu_hv_tlb_flush_fifo *tlb_flush_fifo; 1924 /* 1925 * Normally, there can be no more than 'KVM_HV_TLB_FLUSH_FIFO_SIZE' 1926 * entries on the TLB flush fifo. The last entry, however, needs to be 1927 * always left free for 'flush all' entry which gets placed when 1928 * there is not enough space to put all the requested entries. 1929 */ 1930 u64 __tlb_flush_entries[KVM_HV_TLB_FLUSH_FIFO_SIZE - 1]; 1931 u64 *tlb_flush_entries; 1932 u64 valid_bank_mask; 1933 struct kvm_vcpu *v; 1934 unsigned long i; 1935 bool all_cpus; 1936 1937 /* 1938 * The Hyper-V TLFS doesn't allow more than HV_MAX_SPARSE_VCPU_BANKS 1939 * sparse banks. Fail the build if KVM's max allowed number of 1940 * vCPUs (>4096) exceeds this limit. 1941 */ 1942 BUILD_BUG_ON(KVM_HV_MAX_SPARSE_VCPU_SET_BITS > HV_MAX_SPARSE_VCPU_BANKS); 1943 1944 /* 1945 * 'Slow' hypercall's first parameter is the address in guest's memory 1946 * where hypercall parameters are placed. This is either a GPA or a 1947 * nested GPA when KVM is handling the call from L2 ('direct' TLB 1948 * flush). Translate the address here so the memory can be uniformly 1949 * read with kvm_read_guest(). 1950 */ 1951 if (!hc->fast && is_guest_mode(vcpu)) { 1952 hc->ingpa = translate_nested_gpa(vcpu, hc->ingpa, 0, NULL); 1953 if (unlikely(hc->ingpa == INVALID_GPA)) 1954 return HV_STATUS_INVALID_HYPERCALL_INPUT; 1955 } 1956 1957 if (hc->code == HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST || 1958 hc->code == HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE) { 1959 if (hc->fast) { 1960 flush.address_space = hc->ingpa; 1961 flush.flags = hc->outgpa; 1962 flush.processor_mask = sse128_lo(hc->xmm[0]); 1963 hc->consumed_xmm_halves = 1; 1964 } else { 1965 if (unlikely(kvm_read_guest(kvm, hc->ingpa, 1966 &flush, sizeof(flush)))) 1967 return HV_STATUS_INVALID_HYPERCALL_INPUT; 1968 hc->data_offset = sizeof(flush); 1969 } 1970 1971 trace_kvm_hv_flush_tlb(flush.processor_mask, 1972 flush.address_space, flush.flags, 1973 is_guest_mode(vcpu)); 1974 1975 valid_bank_mask = BIT_ULL(0); 1976 sparse_banks[0] = flush.processor_mask; 1977 1978 /* 1979 * Work around possible WS2012 bug: it sends hypercalls 1980 * with processor_mask = 0x0 and HV_FLUSH_ALL_PROCESSORS clear, 1981 * while also expecting us to flush something and crashing if 1982 * we don't. Let's treat processor_mask == 0 same as 1983 * HV_FLUSH_ALL_PROCESSORS. 1984 */ 1985 all_cpus = (flush.flags & HV_FLUSH_ALL_PROCESSORS) || 1986 flush.processor_mask == 0; 1987 } else { 1988 if (hc->fast) { 1989 flush_ex.address_space = hc->ingpa; 1990 flush_ex.flags = hc->outgpa; 1991 memcpy(&flush_ex.hv_vp_set, 1992 &hc->xmm[0], sizeof(hc->xmm[0])); 1993 hc->consumed_xmm_halves = 2; 1994 } else { 1995 if (unlikely(kvm_read_guest(kvm, hc->ingpa, &flush_ex, 1996 sizeof(flush_ex)))) 1997 return HV_STATUS_INVALID_HYPERCALL_INPUT; 1998 hc->data_offset = sizeof(flush_ex); 1999 } 2000 2001 trace_kvm_hv_flush_tlb_ex(flush_ex.hv_vp_set.valid_bank_mask, 2002 flush_ex.hv_vp_set.format, 2003 flush_ex.address_space, 2004 flush_ex.flags, is_guest_mode(vcpu)); 2005 2006 valid_bank_mask = flush_ex.hv_vp_set.valid_bank_mask; 2007 all_cpus = flush_ex.hv_vp_set.format != 2008 HV_GENERIC_SET_SPARSE_4K; 2009 2010 if (hc->var_cnt != hweight64(valid_bank_mask)) 2011 return HV_STATUS_INVALID_HYPERCALL_INPUT; 2012 2013 if (!all_cpus) { 2014 if (!hc->var_cnt) 2015 goto ret_success; 2016 2017 if (kvm_get_sparse_vp_set(kvm, hc, sparse_banks)) 2018 return HV_STATUS_INVALID_HYPERCALL_INPUT; 2019 } 2020 2021 /* 2022 * Hyper-V TLFS doesn't explicitly forbid non-empty sparse vCPU 2023 * banks (and, thus, non-zero 'var_cnt') for the 'all vCPUs' 2024 * case (HV_GENERIC_SET_ALL). Always adjust data_offset and 2025 * consumed_xmm_halves to make sure TLB flush entries are read 2026 * from the correct offset. 2027 */ 2028 if (hc->fast) 2029 hc->consumed_xmm_halves += hc->var_cnt; 2030 else 2031 hc->data_offset += hc->var_cnt * sizeof(sparse_banks[0]); 2032 } 2033 2034 if (hc->code == HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE || 2035 hc->code == HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX || 2036 hc->rep_cnt > ARRAY_SIZE(__tlb_flush_entries)) { 2037 tlb_flush_entries = NULL; 2038 } else { 2039 if (kvm_hv_get_tlb_flush_entries(kvm, hc, __tlb_flush_entries)) 2040 return HV_STATUS_INVALID_HYPERCALL_INPUT; 2041 tlb_flush_entries = __tlb_flush_entries; 2042 } 2043 2044 /* 2045 * vcpu->arch.cr3 may not be up-to-date for running vCPUs so we can't 2046 * analyze it here, flush TLB regardless of the specified address space. 2047 */ 2048 if (all_cpus && !is_guest_mode(vcpu)) { 2049 kvm_for_each_vcpu(i, v, kvm) { 2050 tlb_flush_fifo = kvm_hv_get_tlb_flush_fifo(v, false); 2051 hv_tlb_flush_enqueue(v, tlb_flush_fifo, 2052 tlb_flush_entries, hc->rep_cnt); 2053 } 2054 2055 kvm_make_all_cpus_request(kvm, KVM_REQ_HV_TLB_FLUSH); 2056 } else if (!is_guest_mode(vcpu)) { 2057 sparse_set_to_vcpu_mask(kvm, sparse_banks, valid_bank_mask, vcpu_mask); 2058 2059 for_each_set_bit(i, vcpu_mask, KVM_MAX_VCPUS) { 2060 v = kvm_get_vcpu(kvm, i); 2061 if (!v) 2062 continue; 2063 tlb_flush_fifo = kvm_hv_get_tlb_flush_fifo(v, false); 2064 hv_tlb_flush_enqueue(v, tlb_flush_fifo, 2065 tlb_flush_entries, hc->rep_cnt); 2066 } 2067 2068 kvm_make_vcpus_request_mask(kvm, KVM_REQ_HV_TLB_FLUSH, vcpu_mask); 2069 } else { 2070 struct kvm_vcpu_hv *hv_v; 2071 2072 bitmap_zero(vcpu_mask, KVM_MAX_VCPUS); 2073 2074 kvm_for_each_vcpu(i, v, kvm) { 2075 hv_v = to_hv_vcpu(v); 2076 2077 /* 2078 * The following check races with nested vCPUs entering/exiting 2079 * and/or migrating between L1's vCPUs, however the only case when 2080 * KVM *must* flush the TLB is when the target L2 vCPU keeps 2081 * running on the same L1 vCPU from the moment of the request until 2082 * kvm_hv_flush_tlb() returns. TLB is fully flushed in all other 2083 * cases, e.g. when the target L2 vCPU migrates to a different L1 2084 * vCPU or when the corresponding L1 vCPU temporary switches to a 2085 * different L2 vCPU while the request is being processed. 2086 */ 2087 if (!hv_v || hv_v->nested.vm_id != hv_vcpu->nested.vm_id) 2088 continue; 2089 2090 if (!all_cpus && 2091 !hv_is_vp_in_sparse_set(hv_v->nested.vp_id, valid_bank_mask, 2092 sparse_banks)) 2093 continue; 2094 2095 __set_bit(i, vcpu_mask); 2096 tlb_flush_fifo = kvm_hv_get_tlb_flush_fifo(v, true); 2097 hv_tlb_flush_enqueue(v, tlb_flush_fifo, 2098 tlb_flush_entries, hc->rep_cnt); 2099 } 2100 2101 kvm_make_vcpus_request_mask(kvm, KVM_REQ_HV_TLB_FLUSH, vcpu_mask); 2102 } 2103 2104 ret_success: 2105 /* We always do full TLB flush, set 'Reps completed' = 'Rep Count' */ 2106 return (u64)HV_STATUS_SUCCESS | 2107 ((u64)hc->rep_cnt << HV_HYPERCALL_REP_COMP_OFFSET); 2108 } 2109 2110 static void kvm_hv_send_ipi_to_many(struct kvm *kvm, u32 vector, 2111 u64 *sparse_banks, u64 valid_bank_mask) 2112 { 2113 struct kvm_lapic_irq irq = { 2114 .delivery_mode = APIC_DM_FIXED, 2115 .vector = vector 2116 }; 2117 struct kvm_vcpu *vcpu; 2118 unsigned long i; 2119 2120 kvm_for_each_vcpu(i, vcpu, kvm) { 2121 if (sparse_banks && 2122 !hv_is_vp_in_sparse_set(kvm_hv_get_vpindex(vcpu), 2123 valid_bank_mask, sparse_banks)) 2124 continue; 2125 2126 /* We fail only when APIC is disabled */ 2127 kvm_apic_set_irq(vcpu, &irq, NULL); 2128 } 2129 } 2130 2131 static u64 kvm_hv_send_ipi(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc) 2132 { 2133 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); 2134 u64 *sparse_banks = hv_vcpu->sparse_banks; 2135 struct kvm *kvm = vcpu->kvm; 2136 struct hv_send_ipi_ex send_ipi_ex; 2137 struct hv_send_ipi send_ipi; 2138 u64 valid_bank_mask; 2139 u32 vector; 2140 bool all_cpus; 2141 2142 if (hc->code == HVCALL_SEND_IPI) { 2143 if (!hc->fast) { 2144 if (unlikely(kvm_read_guest(kvm, hc->ingpa, &send_ipi, 2145 sizeof(send_ipi)))) 2146 return HV_STATUS_INVALID_HYPERCALL_INPUT; 2147 sparse_banks[0] = send_ipi.cpu_mask; 2148 vector = send_ipi.vector; 2149 } else { 2150 /* 'reserved' part of hv_send_ipi should be 0 */ 2151 if (unlikely(hc->ingpa >> 32 != 0)) 2152 return HV_STATUS_INVALID_HYPERCALL_INPUT; 2153 sparse_banks[0] = hc->outgpa; 2154 vector = (u32)hc->ingpa; 2155 } 2156 all_cpus = false; 2157 valid_bank_mask = BIT_ULL(0); 2158 2159 trace_kvm_hv_send_ipi(vector, sparse_banks[0]); 2160 } else { 2161 if (!hc->fast) { 2162 if (unlikely(kvm_read_guest(kvm, hc->ingpa, &send_ipi_ex, 2163 sizeof(send_ipi_ex)))) 2164 return HV_STATUS_INVALID_HYPERCALL_INPUT; 2165 } else { 2166 send_ipi_ex.vector = (u32)hc->ingpa; 2167 send_ipi_ex.vp_set.format = hc->outgpa; 2168 send_ipi_ex.vp_set.valid_bank_mask = sse128_lo(hc->xmm[0]); 2169 } 2170 2171 trace_kvm_hv_send_ipi_ex(send_ipi_ex.vector, 2172 send_ipi_ex.vp_set.format, 2173 send_ipi_ex.vp_set.valid_bank_mask); 2174 2175 vector = send_ipi_ex.vector; 2176 valid_bank_mask = send_ipi_ex.vp_set.valid_bank_mask; 2177 all_cpus = send_ipi_ex.vp_set.format == HV_GENERIC_SET_ALL; 2178 2179 if (hc->var_cnt != hweight64(valid_bank_mask)) 2180 return HV_STATUS_INVALID_HYPERCALL_INPUT; 2181 2182 if (all_cpus) 2183 goto check_and_send_ipi; 2184 2185 if (!hc->var_cnt) 2186 goto ret_success; 2187 2188 if (!hc->fast) 2189 hc->data_offset = offsetof(struct hv_send_ipi_ex, 2190 vp_set.bank_contents); 2191 else 2192 hc->consumed_xmm_halves = 1; 2193 2194 if (kvm_get_sparse_vp_set(kvm, hc, sparse_banks)) 2195 return HV_STATUS_INVALID_HYPERCALL_INPUT; 2196 } 2197 2198 check_and_send_ipi: 2199 if ((vector < HV_IPI_LOW_VECTOR) || (vector > HV_IPI_HIGH_VECTOR)) 2200 return HV_STATUS_INVALID_HYPERCALL_INPUT; 2201 2202 if (all_cpus) 2203 kvm_hv_send_ipi_to_many(kvm, vector, NULL, 0); 2204 else 2205 kvm_hv_send_ipi_to_many(kvm, vector, sparse_banks, valid_bank_mask); 2206 2207 ret_success: 2208 return HV_STATUS_SUCCESS; 2209 } 2210 2211 void kvm_hv_set_cpuid(struct kvm_vcpu *vcpu, bool hyperv_enabled) 2212 { 2213 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); 2214 struct kvm_cpuid_entry2 *entry; 2215 2216 vcpu->arch.hyperv_enabled = hyperv_enabled; 2217 2218 if (!hv_vcpu) { 2219 /* 2220 * KVM should have already allocated kvm_vcpu_hv if Hyper-V is 2221 * enabled in CPUID. 2222 */ 2223 WARN_ON_ONCE(vcpu->arch.hyperv_enabled); 2224 return; 2225 } 2226 2227 memset(&hv_vcpu->cpuid_cache, 0, sizeof(hv_vcpu->cpuid_cache)); 2228 2229 if (!vcpu->arch.hyperv_enabled) 2230 return; 2231 2232 entry = kvm_find_cpuid_entry(vcpu, HYPERV_CPUID_FEATURES); 2233 if (entry) { 2234 hv_vcpu->cpuid_cache.features_eax = entry->eax; 2235 hv_vcpu->cpuid_cache.features_ebx = entry->ebx; 2236 hv_vcpu->cpuid_cache.features_edx = entry->edx; 2237 } 2238 2239 entry = kvm_find_cpuid_entry(vcpu, HYPERV_CPUID_ENLIGHTMENT_INFO); 2240 if (entry) { 2241 hv_vcpu->cpuid_cache.enlightenments_eax = entry->eax; 2242 hv_vcpu->cpuid_cache.enlightenments_ebx = entry->ebx; 2243 } 2244 2245 entry = kvm_find_cpuid_entry(vcpu, HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES); 2246 if (entry) 2247 hv_vcpu->cpuid_cache.syndbg_cap_eax = entry->eax; 2248 2249 entry = kvm_find_cpuid_entry(vcpu, HYPERV_CPUID_NESTED_FEATURES); 2250 if (entry) { 2251 hv_vcpu->cpuid_cache.nested_eax = entry->eax; 2252 hv_vcpu->cpuid_cache.nested_ebx = entry->ebx; 2253 } 2254 } 2255 2256 int kvm_hv_set_enforce_cpuid(struct kvm_vcpu *vcpu, bool enforce) 2257 { 2258 struct kvm_vcpu_hv *hv_vcpu; 2259 int ret = 0; 2260 2261 if (!to_hv_vcpu(vcpu)) { 2262 if (enforce) { 2263 ret = kvm_hv_vcpu_init(vcpu); 2264 if (ret) 2265 return ret; 2266 } else { 2267 return 0; 2268 } 2269 } 2270 2271 hv_vcpu = to_hv_vcpu(vcpu); 2272 hv_vcpu->enforce_cpuid = enforce; 2273 2274 return ret; 2275 } 2276 2277 static void kvm_hv_hypercall_set_result(struct kvm_vcpu *vcpu, u64 result) 2278 { 2279 bool longmode; 2280 2281 longmode = is_64_bit_hypercall(vcpu); 2282 if (longmode) 2283 kvm_rax_write(vcpu, result); 2284 else { 2285 kvm_rdx_write(vcpu, result >> 32); 2286 kvm_rax_write(vcpu, result & 0xffffffff); 2287 } 2288 } 2289 2290 static int kvm_hv_hypercall_complete(struct kvm_vcpu *vcpu, u64 result) 2291 { 2292 u32 tlb_lock_count = 0; 2293 int ret; 2294 2295 if (hv_result_success(result) && is_guest_mode(vcpu) && 2296 kvm_hv_is_tlb_flush_hcall(vcpu) && 2297 kvm_read_guest(vcpu->kvm, to_hv_vcpu(vcpu)->nested.pa_page_gpa, 2298 &tlb_lock_count, sizeof(tlb_lock_count))) 2299 result = HV_STATUS_INVALID_HYPERCALL_INPUT; 2300 2301 trace_kvm_hv_hypercall_done(result); 2302 kvm_hv_hypercall_set_result(vcpu, result); 2303 ++vcpu->stat.hypercalls; 2304 2305 ret = kvm_skip_emulated_instruction(vcpu); 2306 2307 if (tlb_lock_count) 2308 kvm_x86_ops.nested_ops->hv_inject_synthetic_vmexit_post_tlb_flush(vcpu); 2309 2310 return ret; 2311 } 2312 2313 static int kvm_hv_hypercall_complete_userspace(struct kvm_vcpu *vcpu) 2314 { 2315 return kvm_hv_hypercall_complete(vcpu, vcpu->run->hyperv.u.hcall.result); 2316 } 2317 2318 static u16 kvm_hvcall_signal_event(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc) 2319 { 2320 struct kvm_hv *hv = to_kvm_hv(vcpu->kvm); 2321 struct eventfd_ctx *eventfd; 2322 2323 if (unlikely(!hc->fast)) { 2324 int ret; 2325 gpa_t gpa = hc->ingpa; 2326 2327 if ((gpa & (__alignof__(hc->ingpa) - 1)) || 2328 offset_in_page(gpa) + sizeof(hc->ingpa) > PAGE_SIZE) 2329 return HV_STATUS_INVALID_ALIGNMENT; 2330 2331 ret = kvm_vcpu_read_guest(vcpu, gpa, 2332 &hc->ingpa, sizeof(hc->ingpa)); 2333 if (ret < 0) 2334 return HV_STATUS_INVALID_ALIGNMENT; 2335 } 2336 2337 /* 2338 * Per spec, bits 32-47 contain the extra "flag number". However, we 2339 * have no use for it, and in all known usecases it is zero, so just 2340 * report lookup failure if it isn't. 2341 */ 2342 if (hc->ingpa & 0xffff00000000ULL) 2343 return HV_STATUS_INVALID_PORT_ID; 2344 /* remaining bits are reserved-zero */ 2345 if (hc->ingpa & ~KVM_HYPERV_CONN_ID_MASK) 2346 return HV_STATUS_INVALID_HYPERCALL_INPUT; 2347 2348 /* the eventfd is protected by vcpu->kvm->srcu, but conn_to_evt isn't */ 2349 rcu_read_lock(); 2350 eventfd = idr_find(&hv->conn_to_evt, hc->ingpa); 2351 rcu_read_unlock(); 2352 if (!eventfd) 2353 return HV_STATUS_INVALID_PORT_ID; 2354 2355 eventfd_signal(eventfd, 1); 2356 return HV_STATUS_SUCCESS; 2357 } 2358 2359 static bool is_xmm_fast_hypercall(struct kvm_hv_hcall *hc) 2360 { 2361 switch (hc->code) { 2362 case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST: 2363 case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE: 2364 case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX: 2365 case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX: 2366 case HVCALL_SEND_IPI_EX: 2367 return true; 2368 } 2369 2370 return false; 2371 } 2372 2373 static void kvm_hv_hypercall_read_xmm(struct kvm_hv_hcall *hc) 2374 { 2375 int reg; 2376 2377 kvm_fpu_get(); 2378 for (reg = 0; reg < HV_HYPERCALL_MAX_XMM_REGISTERS; reg++) 2379 _kvm_read_sse_reg(reg, &hc->xmm[reg]); 2380 kvm_fpu_put(); 2381 } 2382 2383 static bool hv_check_hypercall_access(struct kvm_vcpu_hv *hv_vcpu, u16 code) 2384 { 2385 if (!hv_vcpu->enforce_cpuid) 2386 return true; 2387 2388 switch (code) { 2389 case HVCALL_NOTIFY_LONG_SPIN_WAIT: 2390 return hv_vcpu->cpuid_cache.enlightenments_ebx && 2391 hv_vcpu->cpuid_cache.enlightenments_ebx != U32_MAX; 2392 case HVCALL_POST_MESSAGE: 2393 return hv_vcpu->cpuid_cache.features_ebx & HV_POST_MESSAGES; 2394 case HVCALL_SIGNAL_EVENT: 2395 return hv_vcpu->cpuid_cache.features_ebx & HV_SIGNAL_EVENTS; 2396 case HVCALL_POST_DEBUG_DATA: 2397 case HVCALL_RETRIEVE_DEBUG_DATA: 2398 case HVCALL_RESET_DEBUG_SESSION: 2399 /* 2400 * Return 'true' when SynDBG is disabled so the resulting code 2401 * will be HV_STATUS_INVALID_HYPERCALL_CODE. 2402 */ 2403 return !kvm_hv_is_syndbg_enabled(hv_vcpu->vcpu) || 2404 hv_vcpu->cpuid_cache.features_ebx & HV_DEBUGGING; 2405 case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX: 2406 case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX: 2407 if (!(hv_vcpu->cpuid_cache.enlightenments_eax & 2408 HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED)) 2409 return false; 2410 fallthrough; 2411 case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST: 2412 case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE: 2413 return hv_vcpu->cpuid_cache.enlightenments_eax & 2414 HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED; 2415 case HVCALL_SEND_IPI_EX: 2416 if (!(hv_vcpu->cpuid_cache.enlightenments_eax & 2417 HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED)) 2418 return false; 2419 fallthrough; 2420 case HVCALL_SEND_IPI: 2421 return hv_vcpu->cpuid_cache.enlightenments_eax & 2422 HV_X64_CLUSTER_IPI_RECOMMENDED; 2423 default: 2424 break; 2425 } 2426 2427 return true; 2428 } 2429 2430 int kvm_hv_hypercall(struct kvm_vcpu *vcpu) 2431 { 2432 struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); 2433 struct kvm_hv_hcall hc; 2434 u64 ret = HV_STATUS_SUCCESS; 2435 2436 /* 2437 * hypercall generates UD from non zero cpl and real mode 2438 * per HYPER-V spec 2439 */ 2440 if (static_call(kvm_x86_get_cpl)(vcpu) != 0 || !is_protmode(vcpu)) { 2441 kvm_queue_exception(vcpu, UD_VECTOR); 2442 return 1; 2443 } 2444 2445 #ifdef CONFIG_X86_64 2446 if (is_64_bit_hypercall(vcpu)) { 2447 hc.param = kvm_rcx_read(vcpu); 2448 hc.ingpa = kvm_rdx_read(vcpu); 2449 hc.outgpa = kvm_r8_read(vcpu); 2450 } else 2451 #endif 2452 { 2453 hc.param = ((u64)kvm_rdx_read(vcpu) << 32) | 2454 (kvm_rax_read(vcpu) & 0xffffffff); 2455 hc.ingpa = ((u64)kvm_rbx_read(vcpu) << 32) | 2456 (kvm_rcx_read(vcpu) & 0xffffffff); 2457 hc.outgpa = ((u64)kvm_rdi_read(vcpu) << 32) | 2458 (kvm_rsi_read(vcpu) & 0xffffffff); 2459 } 2460 2461 hc.code = hc.param & 0xffff; 2462 hc.var_cnt = (hc.param & HV_HYPERCALL_VARHEAD_MASK) >> HV_HYPERCALL_VARHEAD_OFFSET; 2463 hc.fast = !!(hc.param & HV_HYPERCALL_FAST_BIT); 2464 hc.rep_cnt = (hc.param >> HV_HYPERCALL_REP_COMP_OFFSET) & 0xfff; 2465 hc.rep_idx = (hc.param >> HV_HYPERCALL_REP_START_OFFSET) & 0xfff; 2466 hc.rep = !!(hc.rep_cnt || hc.rep_idx); 2467 2468 trace_kvm_hv_hypercall(hc.code, hc.fast, hc.var_cnt, hc.rep_cnt, 2469 hc.rep_idx, hc.ingpa, hc.outgpa); 2470 2471 if (unlikely(!hv_check_hypercall_access(hv_vcpu, hc.code))) { 2472 ret = HV_STATUS_ACCESS_DENIED; 2473 goto hypercall_complete; 2474 } 2475 2476 if (unlikely(hc.param & HV_HYPERCALL_RSVD_MASK)) { 2477 ret = HV_STATUS_INVALID_HYPERCALL_INPUT; 2478 goto hypercall_complete; 2479 } 2480 2481 if (hc.fast && is_xmm_fast_hypercall(&hc)) { 2482 if (unlikely(hv_vcpu->enforce_cpuid && 2483 !(hv_vcpu->cpuid_cache.features_edx & 2484 HV_X64_HYPERCALL_XMM_INPUT_AVAILABLE))) { 2485 kvm_queue_exception(vcpu, UD_VECTOR); 2486 return 1; 2487 } 2488 2489 kvm_hv_hypercall_read_xmm(&hc); 2490 } 2491 2492 switch (hc.code) { 2493 case HVCALL_NOTIFY_LONG_SPIN_WAIT: 2494 if (unlikely(hc.rep || hc.var_cnt)) { 2495 ret = HV_STATUS_INVALID_HYPERCALL_INPUT; 2496 break; 2497 } 2498 kvm_vcpu_on_spin(vcpu, true); 2499 break; 2500 case HVCALL_SIGNAL_EVENT: 2501 if (unlikely(hc.rep || hc.var_cnt)) { 2502 ret = HV_STATUS_INVALID_HYPERCALL_INPUT; 2503 break; 2504 } 2505 ret = kvm_hvcall_signal_event(vcpu, &hc); 2506 if (ret != HV_STATUS_INVALID_PORT_ID) 2507 break; 2508 fallthrough; /* maybe userspace knows this conn_id */ 2509 case HVCALL_POST_MESSAGE: 2510 /* don't bother userspace if it has no way to handle it */ 2511 if (unlikely(hc.rep || hc.var_cnt || !to_hv_synic(vcpu)->active)) { 2512 ret = HV_STATUS_INVALID_HYPERCALL_INPUT; 2513 break; 2514 } 2515 vcpu->run->exit_reason = KVM_EXIT_HYPERV; 2516 vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL; 2517 vcpu->run->hyperv.u.hcall.input = hc.param; 2518 vcpu->run->hyperv.u.hcall.params[0] = hc.ingpa; 2519 vcpu->run->hyperv.u.hcall.params[1] = hc.outgpa; 2520 vcpu->arch.complete_userspace_io = 2521 kvm_hv_hypercall_complete_userspace; 2522 return 0; 2523 case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST: 2524 if (unlikely(hc.var_cnt)) { 2525 ret = HV_STATUS_INVALID_HYPERCALL_INPUT; 2526 break; 2527 } 2528 fallthrough; 2529 case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX: 2530 if (unlikely(!hc.rep_cnt || hc.rep_idx)) { 2531 ret = HV_STATUS_INVALID_HYPERCALL_INPUT; 2532 break; 2533 } 2534 ret = kvm_hv_flush_tlb(vcpu, &hc); 2535 break; 2536 case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE: 2537 if (unlikely(hc.var_cnt)) { 2538 ret = HV_STATUS_INVALID_HYPERCALL_INPUT; 2539 break; 2540 } 2541 fallthrough; 2542 case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX: 2543 if (unlikely(hc.rep)) { 2544 ret = HV_STATUS_INVALID_HYPERCALL_INPUT; 2545 break; 2546 } 2547 ret = kvm_hv_flush_tlb(vcpu, &hc); 2548 break; 2549 case HVCALL_SEND_IPI: 2550 if (unlikely(hc.var_cnt)) { 2551 ret = HV_STATUS_INVALID_HYPERCALL_INPUT; 2552 break; 2553 } 2554 fallthrough; 2555 case HVCALL_SEND_IPI_EX: 2556 if (unlikely(hc.rep)) { 2557 ret = HV_STATUS_INVALID_HYPERCALL_INPUT; 2558 break; 2559 } 2560 ret = kvm_hv_send_ipi(vcpu, &hc); 2561 break; 2562 case HVCALL_POST_DEBUG_DATA: 2563 case HVCALL_RETRIEVE_DEBUG_DATA: 2564 if (unlikely(hc.fast)) { 2565 ret = HV_STATUS_INVALID_PARAMETER; 2566 break; 2567 } 2568 fallthrough; 2569 case HVCALL_RESET_DEBUG_SESSION: { 2570 struct kvm_hv_syndbg *syndbg = to_hv_syndbg(vcpu); 2571 2572 if (!kvm_hv_is_syndbg_enabled(vcpu)) { 2573 ret = HV_STATUS_INVALID_HYPERCALL_CODE; 2574 break; 2575 } 2576 2577 if (!(syndbg->options & HV_X64_SYNDBG_OPTION_USE_HCALLS)) { 2578 ret = HV_STATUS_OPERATION_DENIED; 2579 break; 2580 } 2581 vcpu->run->exit_reason = KVM_EXIT_HYPERV; 2582 vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL; 2583 vcpu->run->hyperv.u.hcall.input = hc.param; 2584 vcpu->run->hyperv.u.hcall.params[0] = hc.ingpa; 2585 vcpu->run->hyperv.u.hcall.params[1] = hc.outgpa; 2586 vcpu->arch.complete_userspace_io = 2587 kvm_hv_hypercall_complete_userspace; 2588 return 0; 2589 } 2590 default: 2591 ret = HV_STATUS_INVALID_HYPERCALL_CODE; 2592 break; 2593 } 2594 2595 hypercall_complete: 2596 return kvm_hv_hypercall_complete(vcpu, ret); 2597 } 2598 2599 void kvm_hv_init_vm(struct kvm *kvm) 2600 { 2601 struct kvm_hv *hv = to_kvm_hv(kvm); 2602 2603 mutex_init(&hv->hv_lock); 2604 idr_init(&hv->conn_to_evt); 2605 } 2606 2607 void kvm_hv_destroy_vm(struct kvm *kvm) 2608 { 2609 struct kvm_hv *hv = to_kvm_hv(kvm); 2610 struct eventfd_ctx *eventfd; 2611 int i; 2612 2613 idr_for_each_entry(&hv->conn_to_evt, eventfd, i) 2614 eventfd_ctx_put(eventfd); 2615 idr_destroy(&hv->conn_to_evt); 2616 } 2617 2618 static int kvm_hv_eventfd_assign(struct kvm *kvm, u32 conn_id, int fd) 2619 { 2620 struct kvm_hv *hv = to_kvm_hv(kvm); 2621 struct eventfd_ctx *eventfd; 2622 int ret; 2623 2624 eventfd = eventfd_ctx_fdget(fd); 2625 if (IS_ERR(eventfd)) 2626 return PTR_ERR(eventfd); 2627 2628 mutex_lock(&hv->hv_lock); 2629 ret = idr_alloc(&hv->conn_to_evt, eventfd, conn_id, conn_id + 1, 2630 GFP_KERNEL_ACCOUNT); 2631 mutex_unlock(&hv->hv_lock); 2632 2633 if (ret >= 0) 2634 return 0; 2635 2636 if (ret == -ENOSPC) 2637 ret = -EEXIST; 2638 eventfd_ctx_put(eventfd); 2639 return ret; 2640 } 2641 2642 static int kvm_hv_eventfd_deassign(struct kvm *kvm, u32 conn_id) 2643 { 2644 struct kvm_hv *hv = to_kvm_hv(kvm); 2645 struct eventfd_ctx *eventfd; 2646 2647 mutex_lock(&hv->hv_lock); 2648 eventfd = idr_remove(&hv->conn_to_evt, conn_id); 2649 mutex_unlock(&hv->hv_lock); 2650 2651 if (!eventfd) 2652 return -ENOENT; 2653 2654 synchronize_srcu(&kvm->srcu); 2655 eventfd_ctx_put(eventfd); 2656 return 0; 2657 } 2658 2659 int kvm_vm_ioctl_hv_eventfd(struct kvm *kvm, struct kvm_hyperv_eventfd *args) 2660 { 2661 if ((args->flags & ~KVM_HYPERV_EVENTFD_DEASSIGN) || 2662 (args->conn_id & ~KVM_HYPERV_CONN_ID_MASK)) 2663 return -EINVAL; 2664 2665 if (args->flags == KVM_HYPERV_EVENTFD_DEASSIGN) 2666 return kvm_hv_eventfd_deassign(kvm, args->conn_id); 2667 return kvm_hv_eventfd_assign(kvm, args->conn_id, args->fd); 2668 } 2669 2670 int kvm_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid, 2671 struct kvm_cpuid_entry2 __user *entries) 2672 { 2673 uint16_t evmcs_ver = 0; 2674 struct kvm_cpuid_entry2 cpuid_entries[] = { 2675 { .function = HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS }, 2676 { .function = HYPERV_CPUID_INTERFACE }, 2677 { .function = HYPERV_CPUID_VERSION }, 2678 { .function = HYPERV_CPUID_FEATURES }, 2679 { .function = HYPERV_CPUID_ENLIGHTMENT_INFO }, 2680 { .function = HYPERV_CPUID_IMPLEMENT_LIMITS }, 2681 { .function = HYPERV_CPUID_SYNDBG_VENDOR_AND_MAX_FUNCTIONS }, 2682 { .function = HYPERV_CPUID_SYNDBG_INTERFACE }, 2683 { .function = HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES }, 2684 { .function = HYPERV_CPUID_NESTED_FEATURES }, 2685 }; 2686 int i, nent = ARRAY_SIZE(cpuid_entries); 2687 2688 if (kvm_x86_ops.nested_ops->get_evmcs_version) 2689 evmcs_ver = kvm_x86_ops.nested_ops->get_evmcs_version(vcpu); 2690 2691 if (cpuid->nent < nent) 2692 return -E2BIG; 2693 2694 if (cpuid->nent > nent) 2695 cpuid->nent = nent; 2696 2697 for (i = 0; i < nent; i++) { 2698 struct kvm_cpuid_entry2 *ent = &cpuid_entries[i]; 2699 u32 signature[3]; 2700 2701 switch (ent->function) { 2702 case HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS: 2703 memcpy(signature, "Linux KVM Hv", 12); 2704 2705 ent->eax = HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES; 2706 ent->ebx = signature[0]; 2707 ent->ecx = signature[1]; 2708 ent->edx = signature[2]; 2709 break; 2710 2711 case HYPERV_CPUID_INTERFACE: 2712 ent->eax = HYPERV_CPUID_SIGNATURE_EAX; 2713 break; 2714 2715 case HYPERV_CPUID_VERSION: 2716 /* 2717 * We implement some Hyper-V 2016 functions so let's use 2718 * this version. 2719 */ 2720 ent->eax = 0x00003839; 2721 ent->ebx = 0x000A0000; 2722 break; 2723 2724 case HYPERV_CPUID_FEATURES: 2725 ent->eax |= HV_MSR_VP_RUNTIME_AVAILABLE; 2726 ent->eax |= HV_MSR_TIME_REF_COUNT_AVAILABLE; 2727 ent->eax |= HV_MSR_SYNIC_AVAILABLE; 2728 ent->eax |= HV_MSR_SYNTIMER_AVAILABLE; 2729 ent->eax |= HV_MSR_APIC_ACCESS_AVAILABLE; 2730 ent->eax |= HV_MSR_HYPERCALL_AVAILABLE; 2731 ent->eax |= HV_MSR_VP_INDEX_AVAILABLE; 2732 ent->eax |= HV_MSR_RESET_AVAILABLE; 2733 ent->eax |= HV_MSR_REFERENCE_TSC_AVAILABLE; 2734 ent->eax |= HV_ACCESS_FREQUENCY_MSRS; 2735 ent->eax |= HV_ACCESS_REENLIGHTENMENT; 2736 2737 ent->ebx |= HV_POST_MESSAGES; 2738 ent->ebx |= HV_SIGNAL_EVENTS; 2739 2740 ent->edx |= HV_X64_HYPERCALL_XMM_INPUT_AVAILABLE; 2741 ent->edx |= HV_FEATURE_FREQUENCY_MSRS_AVAILABLE; 2742 ent->edx |= HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE; 2743 2744 ent->ebx |= HV_DEBUGGING; 2745 ent->edx |= HV_X64_GUEST_DEBUGGING_AVAILABLE; 2746 ent->edx |= HV_FEATURE_DEBUG_MSRS_AVAILABLE; 2747 ent->edx |= HV_FEATURE_EXT_GVA_RANGES_FLUSH; 2748 2749 /* 2750 * Direct Synthetic timers only make sense with in-kernel 2751 * LAPIC 2752 */ 2753 if (!vcpu || lapic_in_kernel(vcpu)) 2754 ent->edx |= HV_STIMER_DIRECT_MODE_AVAILABLE; 2755 2756 break; 2757 2758 case HYPERV_CPUID_ENLIGHTMENT_INFO: 2759 ent->eax |= HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED; 2760 ent->eax |= HV_X64_APIC_ACCESS_RECOMMENDED; 2761 ent->eax |= HV_X64_RELAXED_TIMING_RECOMMENDED; 2762 ent->eax |= HV_X64_CLUSTER_IPI_RECOMMENDED; 2763 ent->eax |= HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED; 2764 if (evmcs_ver) 2765 ent->eax |= HV_X64_ENLIGHTENED_VMCS_RECOMMENDED; 2766 if (!cpu_smt_possible()) 2767 ent->eax |= HV_X64_NO_NONARCH_CORESHARING; 2768 2769 ent->eax |= HV_DEPRECATING_AEOI_RECOMMENDED; 2770 /* 2771 * Default number of spinlock retry attempts, matches 2772 * HyperV 2016. 2773 */ 2774 ent->ebx = 0x00000FFF; 2775 2776 break; 2777 2778 case HYPERV_CPUID_IMPLEMENT_LIMITS: 2779 /* Maximum number of virtual processors */ 2780 ent->eax = KVM_MAX_VCPUS; 2781 /* 2782 * Maximum number of logical processors, matches 2783 * HyperV 2016. 2784 */ 2785 ent->ebx = 64; 2786 2787 break; 2788 2789 case HYPERV_CPUID_NESTED_FEATURES: 2790 ent->eax = evmcs_ver; 2791 ent->eax |= HV_X64_NESTED_DIRECT_FLUSH; 2792 ent->eax |= HV_X64_NESTED_MSR_BITMAP; 2793 ent->ebx |= HV_X64_NESTED_EVMCS1_PERF_GLOBAL_CTRL; 2794 break; 2795 2796 case HYPERV_CPUID_SYNDBG_VENDOR_AND_MAX_FUNCTIONS: 2797 memcpy(signature, "Linux KVM Hv", 12); 2798 2799 ent->eax = 0; 2800 ent->ebx = signature[0]; 2801 ent->ecx = signature[1]; 2802 ent->edx = signature[2]; 2803 break; 2804 2805 case HYPERV_CPUID_SYNDBG_INTERFACE: 2806 memcpy(signature, "VS#1\0\0\0\0\0\0\0\0", 12); 2807 ent->eax = signature[0]; 2808 break; 2809 2810 case HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES: 2811 ent->eax |= HV_X64_SYNDBG_CAP_ALLOW_KERNEL_DEBUGGING; 2812 break; 2813 2814 default: 2815 break; 2816 } 2817 } 2818 2819 if (copy_to_user(entries, cpuid_entries, 2820 nent * sizeof(struct kvm_cpuid_entry2))) 2821 return -EFAULT; 2822 2823 return 0; 2824 } 2825