vmm.c revision 267070
1/*- 2 * Copyright (c) 2011 NetApp, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: stable/10/sys/amd64/vmm/vmm.c 267070 2014-06-04 17:57:48Z jhb $ 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: stable/10/sys/amd64/vmm/vmm.c 267070 2014-06-04 17:57:48Z jhb $"); 31 32#include <sys/param.h> 33#include <sys/systm.h> 34#include <sys/kernel.h> 35#include <sys/module.h> 36#include <sys/sysctl.h> 37#include <sys/malloc.h> 38#include <sys/pcpu.h> 39#include <sys/lock.h> 40#include <sys/mutex.h> 41#include <sys/proc.h> 42#include <sys/rwlock.h> 43#include <sys/sched.h> 44#include <sys/smp.h> 45#include <sys/systm.h> 46 47#include <vm/vm.h> 48#include <vm/vm_object.h> 49#include <vm/vm_page.h> 50#include <vm/pmap.h> 51#include <vm/vm_map.h> 52#include <vm/vm_extern.h> 53#include <vm/vm_param.h> 54 55#include <machine/cpu.h> 56#include <machine/vm.h> 57#include <machine/pcb.h> 58#include <machine/smp.h> 59#include <x86/psl.h> 60#include <x86/apicreg.h> 61#include <machine/vmparam.h> 62 63#include <machine/vmm.h> 64#include <machine/vmm_dev.h> 65 66#include "vmm_ktr.h" 67#include "vmm_host.h" 68#include "vmm_mem.h" 69#include "vmm_util.h" 70#include "vhpet.h" 71#include "vioapic.h" 72#include "vlapic.h" 73#include "vmm_msr.h" 74#include "vmm_ipi.h" 75#include "vmm_stat.h" 76#include "vmm_lapic.h" 77 78#include "io/ppt.h" 79#include "io/iommu.h" 80 81struct vlapic; 82 83struct vcpu { 84 int flags; 85 enum vcpu_state state; 86 struct mtx mtx; 87 int hostcpu; /* host cpuid this vcpu last ran on */ 88 uint64_t guest_msrs[VMM_MSR_NUM]; 89 struct vlapic *vlapic; 90 int vcpuid; 91 struct savefpu *guestfpu; /* guest fpu state */ 92 void *stats; 93 struct vm_exit exitinfo; 94 enum x2apic_state x2apic_state; 95 int nmi_pending; 96}; 97 98#define vcpu_lock_init(v) mtx_init(&((v)->mtx), "vcpu lock", 0, MTX_SPIN) 99#define vcpu_lock(v) mtx_lock_spin(&((v)->mtx)) 100#define vcpu_unlock(v) mtx_unlock_spin(&((v)->mtx)) 101#define vcpu_assert_locked(v) mtx_assert(&((v)->mtx), MA_OWNED) 102 103struct mem_seg { 104 vm_paddr_t gpa; 105 size_t len; 106 boolean_t wired; 107 vm_object_t object; 108}; 109#define VM_MAX_MEMORY_SEGMENTS 2 110 111struct vm { 112 void *cookie; /* processor-specific data */ 113 void *iommu; /* iommu-specific data */ 114 struct vhpet *vhpet; /* virtual HPET */ 115 struct vioapic *vioapic; /* virtual ioapic */ 116 struct vmspace *vmspace; /* guest's address space */ 117 struct vcpu vcpu[VM_MAXCPU]; 118 int num_mem_segs; 119 struct mem_seg mem_segs[VM_MAX_MEMORY_SEGMENTS]; 120 char name[VM_MAX_NAMELEN]; 121 122 /* 123 * Set of active vcpus. 124 * An active vcpu is one that has been started implicitly (BSP) or 125 * explicitly (AP) by sending it a startup ipi. 126 */ 127 volatile cpuset_t active_cpus; 128 129 struct mtx rendezvous_mtx; 130 cpuset_t rendezvous_req_cpus; 131 cpuset_t rendezvous_done_cpus; 132 void *rendezvous_arg; 133 vm_rendezvous_func_t rendezvous_func; 134}; 135 136static int vmm_initialized; 137 138static struct vmm_ops *ops; 139#define VMM_INIT(num) (ops != NULL ? (*ops->init)(num) : 0) 140#define VMM_CLEANUP() (ops != NULL ? (*ops->cleanup)() : 0) 141#define VMM_RESUME() (ops != NULL ? (*ops->resume)() : 0) 142 143#define VMINIT(vm, pmap) (ops != NULL ? (*ops->vminit)(vm, pmap): NULL) 144#define VMRUN(vmi, vcpu, rip, pmap, rptr) \ 145 (ops != NULL ? (*ops->vmrun)(vmi, vcpu, rip, pmap, rptr) : ENXIO) 146#define VMCLEANUP(vmi) (ops != NULL ? (*ops->vmcleanup)(vmi) : NULL) 147#define VMSPACE_ALLOC(min, max) \ 148 (ops != NULL ? (*ops->vmspace_alloc)(min, max) : NULL) 149#define VMSPACE_FREE(vmspace) \ 150 (ops != NULL ? (*ops->vmspace_free)(vmspace) : ENXIO) 151#define VMGETREG(vmi, vcpu, num, retval) \ 152 (ops != NULL ? (*ops->vmgetreg)(vmi, vcpu, num, retval) : ENXIO) 153#define VMSETREG(vmi, vcpu, num, val) \ 154 (ops != NULL ? (*ops->vmsetreg)(vmi, vcpu, num, val) : ENXIO) 155#define VMGETDESC(vmi, vcpu, num, desc) \ 156 (ops != NULL ? (*ops->vmgetdesc)(vmi, vcpu, num, desc) : ENXIO) 157#define VMSETDESC(vmi, vcpu, num, desc) \ 158 (ops != NULL ? (*ops->vmsetdesc)(vmi, vcpu, num, desc) : ENXIO) 159#define VMINJECT(vmi, vcpu, type, vec, ec, ecv) \ 160 (ops != NULL ? (*ops->vminject)(vmi, vcpu, type, vec, ec, ecv) : ENXIO) 161#define VMGETCAP(vmi, vcpu, num, retval) \ 162 (ops != NULL ? (*ops->vmgetcap)(vmi, vcpu, num, retval) : ENXIO) 163#define VMSETCAP(vmi, vcpu, num, val) \ 164 (ops != NULL ? (*ops->vmsetcap)(vmi, vcpu, num, val) : ENXIO) 165#define VLAPIC_INIT(vmi, vcpu) \ 166 (ops != NULL ? (*ops->vlapic_init)(vmi, vcpu) : NULL) 167#define VLAPIC_CLEANUP(vmi, vlapic) \ 168 (ops != NULL ? (*ops->vlapic_cleanup)(vmi, vlapic) : NULL) 169 170#define fpu_start_emulating() load_cr0(rcr0() | CR0_TS) 171#define fpu_stop_emulating() clts() 172 173static MALLOC_DEFINE(M_VM, "vm", "vm"); 174CTASSERT(VMM_MSR_NUM <= 64); /* msr_mask can keep track of up to 64 msrs */ 175 176/* statistics */ 177static VMM_STAT(VCPU_TOTAL_RUNTIME, "vcpu total runtime"); 178 179SYSCTL_NODE(_hw, OID_AUTO, vmm, CTLFLAG_RW, NULL, NULL); 180 181static int vmm_ipinum; 182SYSCTL_INT(_hw_vmm, OID_AUTO, ipinum, CTLFLAG_RD, &vmm_ipinum, 0, 183 "IPI vector used for vcpu notifications"); 184 185static void vm_deactivate_cpu(struct vm *vm, int vcpuid); 186 187static void 188vcpu_cleanup(struct vm *vm, int i) 189{ 190 struct vcpu *vcpu = &vm->vcpu[i]; 191 192 VLAPIC_CLEANUP(vm->cookie, vcpu->vlapic); 193 vmm_stat_free(vcpu->stats); 194 fpu_save_area_free(vcpu->guestfpu); 195} 196 197static void 198vcpu_init(struct vm *vm, uint32_t vcpu_id) 199{ 200 struct vcpu *vcpu; 201 202 vcpu = &vm->vcpu[vcpu_id]; 203 204 vcpu_lock_init(vcpu); 205 vcpu->hostcpu = NOCPU; 206 vcpu->vcpuid = vcpu_id; 207 vcpu->vlapic = VLAPIC_INIT(vm->cookie, vcpu_id); 208 vm_set_x2apic_state(vm, vcpu_id, X2APIC_ENABLED); 209 vcpu->guestfpu = fpu_save_area_alloc(); 210 fpu_save_area_reset(vcpu->guestfpu); 211 vcpu->stats = vmm_stat_alloc(); 212} 213 214struct vm_exit * 215vm_exitinfo(struct vm *vm, int cpuid) 216{ 217 struct vcpu *vcpu; 218 219 if (cpuid < 0 || cpuid >= VM_MAXCPU) 220 panic("vm_exitinfo: invalid cpuid %d", cpuid); 221 222 vcpu = &vm->vcpu[cpuid]; 223 224 return (&vcpu->exitinfo); 225} 226 227static void 228vmm_resume(void) 229{ 230 VMM_RESUME(); 231} 232 233static int 234vmm_init(void) 235{ 236 int error; 237 238 vmm_host_state_init(); 239 240 vmm_ipinum = vmm_ipi_alloc(); 241 if (vmm_ipinum == 0) 242 vmm_ipinum = IPI_AST; 243 244 error = vmm_mem_init(); 245 if (error) 246 return (error); 247 248 if (vmm_is_intel()) 249 ops = &vmm_ops_intel; 250 else if (vmm_is_amd()) 251 ops = &vmm_ops_amd; 252 else 253 return (ENXIO); 254 255 vmm_msr_init(); 256 vmm_resume_p = vmm_resume; 257 258 return (VMM_INIT(vmm_ipinum)); 259} 260 261static int 262vmm_handler(module_t mod, int what, void *arg) 263{ 264 int error; 265 266 switch (what) { 267 case MOD_LOAD: 268 vmmdev_init(); 269 if (ppt_avail_devices() > 0) 270 iommu_init(); 271 error = vmm_init(); 272 if (error == 0) 273 vmm_initialized = 1; 274 break; 275 case MOD_UNLOAD: 276 error = vmmdev_cleanup(); 277 if (error == 0) { 278 vmm_resume_p = NULL; 279 iommu_cleanup(); 280 if (vmm_ipinum != IPI_AST) 281 vmm_ipi_free(vmm_ipinum); 282 error = VMM_CLEANUP(); 283 /* 284 * Something bad happened - prevent new 285 * VMs from being created 286 */ 287 if (error) 288 vmm_initialized = 0; 289 } 290 break; 291 default: 292 error = 0; 293 break; 294 } 295 return (error); 296} 297 298static moduledata_t vmm_kmod = { 299 "vmm", 300 vmm_handler, 301 NULL 302}; 303 304/* 305 * vmm initialization has the following dependencies: 306 * 307 * - iommu initialization must happen after the pci passthru driver has had 308 * a chance to attach to any passthru devices (after SI_SUB_CONFIGURE). 309 * 310 * - VT-x initialization requires smp_rendezvous() and therefore must happen 311 * after SMP is fully functional (after SI_SUB_SMP). 312 */ 313DECLARE_MODULE(vmm, vmm_kmod, SI_SUB_SMP + 1, SI_ORDER_ANY); 314MODULE_VERSION(vmm, 1); 315 316int 317vm_create(const char *name, struct vm **retvm) 318{ 319 int i; 320 struct vm *vm; 321 struct vmspace *vmspace; 322 323 const int BSP = 0; 324 325 /* 326 * If vmm.ko could not be successfully initialized then don't attempt 327 * to create the virtual machine. 328 */ 329 if (!vmm_initialized) 330 return (ENXIO); 331 332 if (name == NULL || strlen(name) >= VM_MAX_NAMELEN) 333 return (EINVAL); 334 335 vmspace = VMSPACE_ALLOC(VM_MIN_ADDRESS, VM_MAXUSER_ADDRESS); 336 if (vmspace == NULL) 337 return (ENOMEM); 338 339 vm = malloc(sizeof(struct vm), M_VM, M_WAITOK | M_ZERO); 340 strcpy(vm->name, name); 341 vm->vmspace = vmspace; 342 mtx_init(&vm->rendezvous_mtx, "vm rendezvous lock", 0, MTX_DEF); 343 vm->cookie = VMINIT(vm, vmspace_pmap(vmspace)); 344 vm->vioapic = vioapic_init(vm); 345 vm->vhpet = vhpet_init(vm); 346 347 for (i = 0; i < VM_MAXCPU; i++) { 348 vcpu_init(vm, i); 349 guest_msrs_init(vm, i); 350 } 351 352 vm_activate_cpu(vm, BSP); 353 354 *retvm = vm; 355 return (0); 356} 357 358static void 359vm_free_mem_seg(struct vm *vm, struct mem_seg *seg) 360{ 361 362 if (seg->object != NULL) 363 vmm_mem_free(vm->vmspace, seg->gpa, seg->len); 364 365 bzero(seg, sizeof(*seg)); 366} 367 368void 369vm_destroy(struct vm *vm) 370{ 371 int i; 372 373 ppt_unassign_all(vm); 374 375 if (vm->iommu != NULL) 376 iommu_destroy_domain(vm->iommu); 377 378 vhpet_cleanup(vm->vhpet); 379 vioapic_cleanup(vm->vioapic); 380 381 for (i = 0; i < vm->num_mem_segs; i++) 382 vm_free_mem_seg(vm, &vm->mem_segs[i]); 383 384 vm->num_mem_segs = 0; 385 386 for (i = 0; i < VM_MAXCPU; i++) 387 vcpu_cleanup(vm, i); 388 389 VMSPACE_FREE(vm->vmspace); 390 391 VMCLEANUP(vm->cookie); 392 393 free(vm, M_VM); 394} 395 396const char * 397vm_name(struct vm *vm) 398{ 399 return (vm->name); 400} 401 402int 403vm_map_mmio(struct vm *vm, vm_paddr_t gpa, size_t len, vm_paddr_t hpa) 404{ 405 vm_object_t obj; 406 407 if ((obj = vmm_mmio_alloc(vm->vmspace, gpa, len, hpa)) == NULL) 408 return (ENOMEM); 409 else 410 return (0); 411} 412 413int 414vm_unmap_mmio(struct vm *vm, vm_paddr_t gpa, size_t len) 415{ 416 417 vmm_mmio_free(vm->vmspace, gpa, len); 418 return (0); 419} 420 421boolean_t 422vm_mem_allocated(struct vm *vm, vm_paddr_t gpa) 423{ 424 int i; 425 vm_paddr_t gpabase, gpalimit; 426 427 for (i = 0; i < vm->num_mem_segs; i++) { 428 gpabase = vm->mem_segs[i].gpa; 429 gpalimit = gpabase + vm->mem_segs[i].len; 430 if (gpa >= gpabase && gpa < gpalimit) 431 return (TRUE); /* 'gpa' is regular memory */ 432 } 433 434 if (ppt_is_mmio(vm, gpa)) 435 return (TRUE); /* 'gpa' is pci passthru mmio */ 436 437 return (FALSE); 438} 439 440int 441vm_malloc(struct vm *vm, vm_paddr_t gpa, size_t len) 442{ 443 int available, allocated; 444 struct mem_seg *seg; 445 vm_object_t object; 446 vm_paddr_t g; 447 448 if ((gpa & PAGE_MASK) || (len & PAGE_MASK) || len == 0) 449 return (EINVAL); 450 451 available = allocated = 0; 452 g = gpa; 453 while (g < gpa + len) { 454 if (vm_mem_allocated(vm, g)) 455 allocated++; 456 else 457 available++; 458 459 g += PAGE_SIZE; 460 } 461 462 /* 463 * If there are some allocated and some available pages in the address 464 * range then it is an error. 465 */ 466 if (allocated && available) 467 return (EINVAL); 468 469 /* 470 * If the entire address range being requested has already been 471 * allocated then there isn't anything more to do. 472 */ 473 if (allocated && available == 0) 474 return (0); 475 476 if (vm->num_mem_segs >= VM_MAX_MEMORY_SEGMENTS) 477 return (E2BIG); 478 479 seg = &vm->mem_segs[vm->num_mem_segs]; 480 481 if ((object = vmm_mem_alloc(vm->vmspace, gpa, len)) == NULL) 482 return (ENOMEM); 483 484 seg->gpa = gpa; 485 seg->len = len; 486 seg->object = object; 487 seg->wired = FALSE; 488 489 vm->num_mem_segs++; 490 491 return (0); 492} 493 494static void 495vm_gpa_unwire(struct vm *vm) 496{ 497 int i, rv; 498 struct mem_seg *seg; 499 500 for (i = 0; i < vm->num_mem_segs; i++) { 501 seg = &vm->mem_segs[i]; 502 if (!seg->wired) 503 continue; 504 505 rv = vm_map_unwire(&vm->vmspace->vm_map, 506 seg->gpa, seg->gpa + seg->len, 507 VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES); 508 KASSERT(rv == KERN_SUCCESS, ("vm(%s) memory segment " 509 "%#lx/%ld could not be unwired: %d", 510 vm_name(vm), seg->gpa, seg->len, rv)); 511 512 seg->wired = FALSE; 513 } 514} 515 516static int 517vm_gpa_wire(struct vm *vm) 518{ 519 int i, rv; 520 struct mem_seg *seg; 521 522 for (i = 0; i < vm->num_mem_segs; i++) { 523 seg = &vm->mem_segs[i]; 524 if (seg->wired) 525 continue; 526 527 /* XXX rlimits? */ 528 rv = vm_map_wire(&vm->vmspace->vm_map, 529 seg->gpa, seg->gpa + seg->len, 530 VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES); 531 if (rv != KERN_SUCCESS) 532 break; 533 534 seg->wired = TRUE; 535 } 536 537 if (i < vm->num_mem_segs) { 538 /* 539 * Undo the wiring before returning an error. 540 */ 541 vm_gpa_unwire(vm); 542 return (EAGAIN); 543 } 544 545 return (0); 546} 547 548static void 549vm_iommu_modify(struct vm *vm, boolean_t map) 550{ 551 int i, sz; 552 vm_paddr_t gpa, hpa; 553 struct mem_seg *seg; 554 void *vp, *cookie, *host_domain; 555 556 sz = PAGE_SIZE; 557 host_domain = iommu_host_domain(); 558 559 for (i = 0; i < vm->num_mem_segs; i++) { 560 seg = &vm->mem_segs[i]; 561 KASSERT(seg->wired, ("vm(%s) memory segment %#lx/%ld not wired", 562 vm_name(vm), seg->gpa, seg->len)); 563 564 gpa = seg->gpa; 565 while (gpa < seg->gpa + seg->len) { 566 vp = vm_gpa_hold(vm, gpa, PAGE_SIZE, VM_PROT_WRITE, 567 &cookie); 568 KASSERT(vp != NULL, ("vm(%s) could not map gpa %#lx", 569 vm_name(vm), gpa)); 570 571 vm_gpa_release(cookie); 572 573 hpa = DMAP_TO_PHYS((uintptr_t)vp); 574 if (map) { 575 iommu_create_mapping(vm->iommu, gpa, hpa, sz); 576 iommu_remove_mapping(host_domain, hpa, sz); 577 } else { 578 iommu_remove_mapping(vm->iommu, gpa, sz); 579 iommu_create_mapping(host_domain, hpa, hpa, sz); 580 } 581 582 gpa += PAGE_SIZE; 583 } 584 } 585 586 /* 587 * Invalidate the cached translations associated with the domain 588 * from which pages were removed. 589 */ 590 if (map) 591 iommu_invalidate_tlb(host_domain); 592 else 593 iommu_invalidate_tlb(vm->iommu); 594} 595 596#define vm_iommu_unmap(vm) vm_iommu_modify((vm), FALSE) 597#define vm_iommu_map(vm) vm_iommu_modify((vm), TRUE) 598 599int 600vm_unassign_pptdev(struct vm *vm, int bus, int slot, int func) 601{ 602 int error; 603 604 error = ppt_unassign_device(vm, bus, slot, func); 605 if (error) 606 return (error); 607 608 if (ppt_assigned_devices(vm) == 0) { 609 vm_iommu_unmap(vm); 610 vm_gpa_unwire(vm); 611 } 612 return (0); 613} 614 615int 616vm_assign_pptdev(struct vm *vm, int bus, int slot, int func) 617{ 618 int error; 619 vm_paddr_t maxaddr; 620 621 /* 622 * Virtual machines with pci passthru devices get special treatment: 623 * - the guest physical memory is wired 624 * - the iommu is programmed to do the 'gpa' to 'hpa' translation 625 * 626 * We need to do this before the first pci passthru device is attached. 627 */ 628 if (ppt_assigned_devices(vm) == 0) { 629 KASSERT(vm->iommu == NULL, 630 ("vm_assign_pptdev: iommu must be NULL")); 631 maxaddr = vmm_mem_maxaddr(); 632 vm->iommu = iommu_create_domain(maxaddr); 633 634 error = vm_gpa_wire(vm); 635 if (error) 636 return (error); 637 638 vm_iommu_map(vm); 639 } 640 641 error = ppt_assign_device(vm, bus, slot, func); 642 return (error); 643} 644 645void * 646vm_gpa_hold(struct vm *vm, vm_paddr_t gpa, size_t len, int reqprot, 647 void **cookie) 648{ 649 int count, pageoff; 650 vm_page_t m; 651 652 pageoff = gpa & PAGE_MASK; 653 if (len > PAGE_SIZE - pageoff) 654 panic("vm_gpa_hold: invalid gpa/len: 0x%016lx/%lu", gpa, len); 655 656 count = vm_fault_quick_hold_pages(&vm->vmspace->vm_map, 657 trunc_page(gpa), PAGE_SIZE, reqprot, &m, 1); 658 659 if (count == 1) { 660 *cookie = m; 661 return ((void *)(PHYS_TO_DMAP(VM_PAGE_TO_PHYS(m)) + pageoff)); 662 } else { 663 *cookie = NULL; 664 return (NULL); 665 } 666} 667 668void 669vm_gpa_release(void *cookie) 670{ 671 vm_page_t m = cookie; 672 673 vm_page_lock(m); 674 vm_page_unhold(m); 675 vm_page_unlock(m); 676} 677 678int 679vm_gpabase2memseg(struct vm *vm, vm_paddr_t gpabase, 680 struct vm_memory_segment *seg) 681{ 682 int i; 683 684 for (i = 0; i < vm->num_mem_segs; i++) { 685 if (gpabase == vm->mem_segs[i].gpa) { 686 seg->gpa = vm->mem_segs[i].gpa; 687 seg->len = vm->mem_segs[i].len; 688 seg->wired = vm->mem_segs[i].wired; 689 return (0); 690 } 691 } 692 return (-1); 693} 694 695int 696vm_get_memobj(struct vm *vm, vm_paddr_t gpa, size_t len, 697 vm_offset_t *offset, struct vm_object **object) 698{ 699 int i; 700 size_t seg_len; 701 vm_paddr_t seg_gpa; 702 vm_object_t seg_obj; 703 704 for (i = 0; i < vm->num_mem_segs; i++) { 705 if ((seg_obj = vm->mem_segs[i].object) == NULL) 706 continue; 707 708 seg_gpa = vm->mem_segs[i].gpa; 709 seg_len = vm->mem_segs[i].len; 710 711 if (gpa >= seg_gpa && gpa < seg_gpa + seg_len) { 712 *offset = gpa - seg_gpa; 713 *object = seg_obj; 714 vm_object_reference(seg_obj); 715 return (0); 716 } 717 } 718 719 return (EINVAL); 720} 721 722int 723vm_get_register(struct vm *vm, int vcpu, int reg, uint64_t *retval) 724{ 725 726 if (vcpu < 0 || vcpu >= VM_MAXCPU) 727 return (EINVAL); 728 729 if (reg >= VM_REG_LAST) 730 return (EINVAL); 731 732 return (VMGETREG(vm->cookie, vcpu, reg, retval)); 733} 734 735int 736vm_set_register(struct vm *vm, int vcpu, int reg, uint64_t val) 737{ 738 739 if (vcpu < 0 || vcpu >= VM_MAXCPU) 740 return (EINVAL); 741 742 if (reg >= VM_REG_LAST) 743 return (EINVAL); 744 745 return (VMSETREG(vm->cookie, vcpu, reg, val)); 746} 747 748static boolean_t 749is_descriptor_table(int reg) 750{ 751 752 switch (reg) { 753 case VM_REG_GUEST_IDTR: 754 case VM_REG_GUEST_GDTR: 755 return (TRUE); 756 default: 757 return (FALSE); 758 } 759} 760 761static boolean_t 762is_segment_register(int reg) 763{ 764 765 switch (reg) { 766 case VM_REG_GUEST_ES: 767 case VM_REG_GUEST_CS: 768 case VM_REG_GUEST_SS: 769 case VM_REG_GUEST_DS: 770 case VM_REG_GUEST_FS: 771 case VM_REG_GUEST_GS: 772 case VM_REG_GUEST_TR: 773 case VM_REG_GUEST_LDTR: 774 return (TRUE); 775 default: 776 return (FALSE); 777 } 778} 779 780int 781vm_get_seg_desc(struct vm *vm, int vcpu, int reg, 782 struct seg_desc *desc) 783{ 784 785 if (vcpu < 0 || vcpu >= VM_MAXCPU) 786 return (EINVAL); 787 788 if (!is_segment_register(reg) && !is_descriptor_table(reg)) 789 return (EINVAL); 790 791 return (VMGETDESC(vm->cookie, vcpu, reg, desc)); 792} 793 794int 795vm_set_seg_desc(struct vm *vm, int vcpu, int reg, 796 struct seg_desc *desc) 797{ 798 if (vcpu < 0 || vcpu >= VM_MAXCPU) 799 return (EINVAL); 800 801 if (!is_segment_register(reg) && !is_descriptor_table(reg)) 802 return (EINVAL); 803 804 return (VMSETDESC(vm->cookie, vcpu, reg, desc)); 805} 806 807static void 808restore_guest_fpustate(struct vcpu *vcpu) 809{ 810 811 /* flush host state to the pcb */ 812 fpuexit(curthread); 813 814 /* restore guest FPU state */ 815 fpu_stop_emulating(); 816 fpurestore(vcpu->guestfpu); 817 818 /* 819 * The FPU is now "dirty" with the guest's state so turn on emulation 820 * to trap any access to the FPU by the host. 821 */ 822 fpu_start_emulating(); 823} 824 825static void 826save_guest_fpustate(struct vcpu *vcpu) 827{ 828 829 if ((rcr0() & CR0_TS) == 0) 830 panic("fpu emulation not enabled in host!"); 831 832 /* save guest FPU state */ 833 fpu_stop_emulating(); 834 fpusave(vcpu->guestfpu); 835 fpu_start_emulating(); 836} 837 838static VMM_STAT(VCPU_IDLE_TICKS, "number of ticks vcpu was idle"); 839 840static int 841vcpu_set_state_locked(struct vcpu *vcpu, enum vcpu_state newstate, 842 bool from_idle) 843{ 844 int error; 845 846 vcpu_assert_locked(vcpu); 847 848 /* 849 * State transitions from the vmmdev_ioctl() must always begin from 850 * the VCPU_IDLE state. This guarantees that there is only a single 851 * ioctl() operating on a vcpu at any point. 852 */ 853 if (from_idle) { 854 while (vcpu->state != VCPU_IDLE) 855 msleep_spin(&vcpu->state, &vcpu->mtx, "vmstat", hz); 856 } else { 857 KASSERT(vcpu->state != VCPU_IDLE, ("invalid transition from " 858 "vcpu idle state")); 859 } 860 861 if (vcpu->state == VCPU_RUNNING) { 862 KASSERT(vcpu->hostcpu == curcpu, ("curcpu %d and hostcpu %d " 863 "mismatch for running vcpu", curcpu, vcpu->hostcpu)); 864 } else { 865 KASSERT(vcpu->hostcpu == NOCPU, ("Invalid hostcpu %d for a " 866 "vcpu that is not running", vcpu->hostcpu)); 867 } 868 869 /* 870 * The following state transitions are allowed: 871 * IDLE -> FROZEN -> IDLE 872 * FROZEN -> RUNNING -> FROZEN 873 * FROZEN -> SLEEPING -> FROZEN 874 */ 875 switch (vcpu->state) { 876 case VCPU_IDLE: 877 case VCPU_RUNNING: 878 case VCPU_SLEEPING: 879 error = (newstate != VCPU_FROZEN); 880 break; 881 case VCPU_FROZEN: 882 error = (newstate == VCPU_FROZEN); 883 break; 884 default: 885 error = 1; 886 break; 887 } 888 889 if (error) 890 return (EBUSY); 891 892 vcpu->state = newstate; 893 if (newstate == VCPU_RUNNING) 894 vcpu->hostcpu = curcpu; 895 else 896 vcpu->hostcpu = NOCPU; 897 898 if (newstate == VCPU_IDLE) 899 wakeup(&vcpu->state); 900 901 return (0); 902} 903 904static void 905vcpu_require_state(struct vm *vm, int vcpuid, enum vcpu_state newstate) 906{ 907 int error; 908 909 if ((error = vcpu_set_state(vm, vcpuid, newstate, false)) != 0) 910 panic("Error %d setting state to %d\n", error, newstate); 911} 912 913static void 914vcpu_require_state_locked(struct vcpu *vcpu, enum vcpu_state newstate) 915{ 916 int error; 917 918 if ((error = vcpu_set_state_locked(vcpu, newstate, false)) != 0) 919 panic("Error %d setting state to %d", error, newstate); 920} 921 922static void 923vm_set_rendezvous_func(struct vm *vm, vm_rendezvous_func_t func) 924{ 925 926 KASSERT(mtx_owned(&vm->rendezvous_mtx), ("rendezvous_mtx not locked")); 927 928 /* 929 * Update 'rendezvous_func' and execute a write memory barrier to 930 * ensure that it is visible across all host cpus. This is not needed 931 * for correctness but it does ensure that all the vcpus will notice 932 * that the rendezvous is requested immediately. 933 */ 934 vm->rendezvous_func = func; 935 wmb(); 936} 937 938#define RENDEZVOUS_CTR0(vm, vcpuid, fmt) \ 939 do { \ 940 if (vcpuid >= 0) \ 941 VCPU_CTR0(vm, vcpuid, fmt); \ 942 else \ 943 VM_CTR0(vm, fmt); \ 944 } while (0) 945 946static void 947vm_handle_rendezvous(struct vm *vm, int vcpuid) 948{ 949 950 KASSERT(vcpuid == -1 || (vcpuid >= 0 && vcpuid < VM_MAXCPU), 951 ("vm_handle_rendezvous: invalid vcpuid %d", vcpuid)); 952 953 mtx_lock(&vm->rendezvous_mtx); 954 while (vm->rendezvous_func != NULL) { 955 /* 'rendezvous_req_cpus' must be a subset of 'active_cpus' */ 956 CPU_AND(&vm->rendezvous_req_cpus, &vm->active_cpus); 957 958 if (vcpuid != -1 && 959 CPU_ISSET(vcpuid, &vm->rendezvous_req_cpus) && 960 !CPU_ISSET(vcpuid, &vm->rendezvous_done_cpus)) { 961 VCPU_CTR0(vm, vcpuid, "Calling rendezvous func"); 962 (*vm->rendezvous_func)(vm, vcpuid, vm->rendezvous_arg); 963 CPU_SET(vcpuid, &vm->rendezvous_done_cpus); 964 } 965 if (CPU_CMP(&vm->rendezvous_req_cpus, 966 &vm->rendezvous_done_cpus) == 0) { 967 VCPU_CTR0(vm, vcpuid, "Rendezvous completed"); 968 vm_set_rendezvous_func(vm, NULL); 969 wakeup(&vm->rendezvous_func); 970 break; 971 } 972 RENDEZVOUS_CTR0(vm, vcpuid, "Wait for rendezvous completion"); 973 mtx_sleep(&vm->rendezvous_func, &vm->rendezvous_mtx, 0, 974 "vmrndv", 0); 975 } 976 mtx_unlock(&vm->rendezvous_mtx); 977} 978 979/* 980 * Emulate a guest 'hlt' by sleeping until the vcpu is ready to run. 981 */ 982static int 983vm_handle_hlt(struct vm *vm, int vcpuid, bool intr_disabled, bool *retu) 984{ 985 struct vm_exit *vmexit; 986 struct vcpu *vcpu; 987 int t, timo, spindown; 988 989 vcpu = &vm->vcpu[vcpuid]; 990 spindown = 0; 991 992 vcpu_lock(vcpu); 993 994 /* 995 * Do a final check for pending NMI or interrupts before 996 * really putting this thread to sleep. 997 * 998 * These interrupts could have happened any time after we 999 * returned from VMRUN() and before we grabbed the vcpu lock. 1000 */ 1001 if (!vm_nmi_pending(vm, vcpuid) && 1002 (intr_disabled || !vlapic_pending_intr(vcpu->vlapic, NULL))) { 1003 t = ticks; 1004 vcpu_require_state_locked(vcpu, VCPU_SLEEPING); 1005 if (vlapic_enabled(vcpu->vlapic)) { 1006 /* 1007 * XXX msleep_spin() is not interruptible so use the 1008 * 'timo' to put an upper bound on the sleep time. 1009 */ 1010 timo = hz; 1011 msleep_spin(vcpu, &vcpu->mtx, "vmidle", timo); 1012 } else { 1013 /* 1014 * Spindown the vcpu if the apic is disabled and it 1015 * had entered the halted state. 1016 */ 1017 spindown = 1; 1018 } 1019 vcpu_require_state_locked(vcpu, VCPU_FROZEN); 1020 vmm_stat_incr(vm, vcpuid, VCPU_IDLE_TICKS, ticks - t); 1021 } 1022 vcpu_unlock(vcpu); 1023 1024 /* 1025 * Since 'vm_deactivate_cpu()' grabs a sleep mutex we must call it 1026 * outside the confines of the vcpu spinlock. 1027 */ 1028 if (spindown) { 1029 *retu = true; 1030 vmexit = vm_exitinfo(vm, vcpuid); 1031 vmexit->exitcode = VM_EXITCODE_SPINDOWN_CPU; 1032 vm_deactivate_cpu(vm, vcpuid); 1033 VCPU_CTR0(vm, vcpuid, "spinning down cpu"); 1034 } 1035 1036 return (0); 1037} 1038 1039static int 1040vm_handle_paging(struct vm *vm, int vcpuid, bool *retu) 1041{ 1042 int rv, ftype; 1043 struct vm_map *map; 1044 struct vcpu *vcpu; 1045 struct vm_exit *vme; 1046 1047 vcpu = &vm->vcpu[vcpuid]; 1048 vme = &vcpu->exitinfo; 1049 1050 ftype = vme->u.paging.fault_type; 1051 KASSERT(ftype == VM_PROT_READ || 1052 ftype == VM_PROT_WRITE || ftype == VM_PROT_EXECUTE, 1053 ("vm_handle_paging: invalid fault_type %d", ftype)); 1054 1055 if (ftype == VM_PROT_READ || ftype == VM_PROT_WRITE) { 1056 rv = pmap_emulate_accessed_dirty(vmspace_pmap(vm->vmspace), 1057 vme->u.paging.gpa, ftype); 1058 if (rv == 0) 1059 goto done; 1060 } 1061 1062 map = &vm->vmspace->vm_map; 1063 rv = vm_fault(map, vme->u.paging.gpa, ftype, VM_FAULT_NORMAL); 1064 1065 VCPU_CTR3(vm, vcpuid, "vm_handle_paging rv = %d, gpa = %#lx, " 1066 "ftype = %d", rv, vme->u.paging.gpa, ftype); 1067 1068 if (rv != KERN_SUCCESS) 1069 return (EFAULT); 1070done: 1071 /* restart execution at the faulting instruction */ 1072 vme->inst_length = 0; 1073 1074 return (0); 1075} 1076 1077static int 1078vm_handle_inst_emul(struct vm *vm, int vcpuid, bool *retu) 1079{ 1080 struct vie *vie; 1081 struct vcpu *vcpu; 1082 struct vm_exit *vme; 1083 int error, inst_length; 1084 uint64_t rip, gla, gpa, cr3; 1085 mem_region_read_t mread; 1086 mem_region_write_t mwrite; 1087 1088 vcpu = &vm->vcpu[vcpuid]; 1089 vme = &vcpu->exitinfo; 1090 1091 rip = vme->rip; 1092 inst_length = vme->inst_length; 1093 1094 gla = vme->u.inst_emul.gla; 1095 gpa = vme->u.inst_emul.gpa; 1096 cr3 = vme->u.inst_emul.cr3; 1097 vie = &vme->u.inst_emul.vie; 1098 1099 vie_init(vie); 1100 1101 /* Fetch, decode and emulate the faulting instruction */ 1102 if (vmm_fetch_instruction(vm, vcpuid, rip, inst_length, cr3, vie) != 0) 1103 return (EFAULT); 1104 1105 if (vmm_decode_instruction(vm, vcpuid, gla, vie) != 0) 1106 return (EFAULT); 1107 1108 /* return to userland unless this is an in-kernel emulated device */ 1109 if (gpa >= DEFAULT_APIC_BASE && gpa < DEFAULT_APIC_BASE + PAGE_SIZE) { 1110 mread = lapic_mmio_read; 1111 mwrite = lapic_mmio_write; 1112 } else if (gpa >= VIOAPIC_BASE && gpa < VIOAPIC_BASE + VIOAPIC_SIZE) { 1113 mread = vioapic_mmio_read; 1114 mwrite = vioapic_mmio_write; 1115 } else if (gpa >= VHPET_BASE && gpa < VHPET_BASE + VHPET_SIZE) { 1116 mread = vhpet_mmio_read; 1117 mwrite = vhpet_mmio_write; 1118 } else { 1119 *retu = true; 1120 return (0); 1121 } 1122 1123 error = vmm_emulate_instruction(vm, vcpuid, gpa, vie, mread, mwrite, 1124 retu); 1125 1126 return (error); 1127} 1128 1129int 1130vm_run(struct vm *vm, struct vm_run *vmrun) 1131{ 1132 int error, vcpuid; 1133 struct vcpu *vcpu; 1134 struct pcb *pcb; 1135 uint64_t tscval, rip; 1136 struct vm_exit *vme; 1137 bool retu, intr_disabled; 1138 pmap_t pmap; 1139 1140 vcpuid = vmrun->cpuid; 1141 1142 if (vcpuid < 0 || vcpuid >= VM_MAXCPU) 1143 return (EINVAL); 1144 1145 pmap = vmspace_pmap(vm->vmspace); 1146 vcpu = &vm->vcpu[vcpuid]; 1147 vme = &vcpu->exitinfo; 1148 rip = vmrun->rip; 1149restart: 1150 critical_enter(); 1151 1152 KASSERT(!CPU_ISSET(curcpu, &pmap->pm_active), 1153 ("vm_run: absurd pm_active")); 1154 1155 tscval = rdtsc(); 1156 1157 pcb = PCPU_GET(curpcb); 1158 set_pcb_flags(pcb, PCB_FULL_IRET); 1159 1160 restore_guest_msrs(vm, vcpuid); 1161 restore_guest_fpustate(vcpu); 1162 1163 vcpu_require_state(vm, vcpuid, VCPU_RUNNING); 1164 error = VMRUN(vm->cookie, vcpuid, rip, pmap, &vm->rendezvous_func); 1165 vcpu_require_state(vm, vcpuid, VCPU_FROZEN); 1166 1167 save_guest_fpustate(vcpu); 1168 restore_host_msrs(vm, vcpuid); 1169 1170 vmm_stat_incr(vm, vcpuid, VCPU_TOTAL_RUNTIME, rdtsc() - tscval); 1171 1172 critical_exit(); 1173 1174 if (error == 0) { 1175 retu = false; 1176 switch (vme->exitcode) { 1177 case VM_EXITCODE_IOAPIC_EOI: 1178 vioapic_process_eoi(vm, vcpuid, 1179 vme->u.ioapic_eoi.vector); 1180 break; 1181 case VM_EXITCODE_RENDEZVOUS: 1182 vm_handle_rendezvous(vm, vcpuid); 1183 error = 0; 1184 break; 1185 case VM_EXITCODE_HLT: 1186 intr_disabled = ((vme->u.hlt.rflags & PSL_I) == 0); 1187 error = vm_handle_hlt(vm, vcpuid, intr_disabled, &retu); 1188 break; 1189 case VM_EXITCODE_PAGING: 1190 error = vm_handle_paging(vm, vcpuid, &retu); 1191 break; 1192 case VM_EXITCODE_INST_EMUL: 1193 error = vm_handle_inst_emul(vm, vcpuid, &retu); 1194 break; 1195 default: 1196 retu = true; /* handled in userland */ 1197 break; 1198 } 1199 } 1200 1201 if (error == 0 && retu == false) { 1202 rip = vme->rip + vme->inst_length; 1203 goto restart; 1204 } 1205 1206 /* copy the exit information */ 1207 bcopy(vme, &vmrun->vm_exit, sizeof(struct vm_exit)); 1208 return (error); 1209} 1210 1211int 1212vm_inject_event(struct vm *vm, int vcpuid, int type, 1213 int vector, uint32_t code, int code_valid) 1214{ 1215 if (vcpuid < 0 || vcpuid >= VM_MAXCPU) 1216 return (EINVAL); 1217 1218 if ((type > VM_EVENT_NONE && type < VM_EVENT_MAX) == 0) 1219 return (EINVAL); 1220 1221 if (vector < 0 || vector > 255) 1222 return (EINVAL); 1223 1224 return (VMINJECT(vm->cookie, vcpuid, type, vector, code, code_valid)); 1225} 1226 1227static VMM_STAT(VCPU_NMI_COUNT, "number of NMIs delivered to vcpu"); 1228 1229int 1230vm_inject_nmi(struct vm *vm, int vcpuid) 1231{ 1232 struct vcpu *vcpu; 1233 1234 if (vcpuid < 0 || vcpuid >= VM_MAXCPU) 1235 return (EINVAL); 1236 1237 vcpu = &vm->vcpu[vcpuid]; 1238 1239 vcpu->nmi_pending = 1; 1240 vcpu_notify_event(vm, vcpuid, false); 1241 return (0); 1242} 1243 1244int 1245vm_nmi_pending(struct vm *vm, int vcpuid) 1246{ 1247 struct vcpu *vcpu; 1248 1249 if (vcpuid < 0 || vcpuid >= VM_MAXCPU) 1250 panic("vm_nmi_pending: invalid vcpuid %d", vcpuid); 1251 1252 vcpu = &vm->vcpu[vcpuid]; 1253 1254 return (vcpu->nmi_pending); 1255} 1256 1257void 1258vm_nmi_clear(struct vm *vm, int vcpuid) 1259{ 1260 struct vcpu *vcpu; 1261 1262 if (vcpuid < 0 || vcpuid >= VM_MAXCPU) 1263 panic("vm_nmi_pending: invalid vcpuid %d", vcpuid); 1264 1265 vcpu = &vm->vcpu[vcpuid]; 1266 1267 if (vcpu->nmi_pending == 0) 1268 panic("vm_nmi_clear: inconsistent nmi_pending state"); 1269 1270 vcpu->nmi_pending = 0; 1271 vmm_stat_incr(vm, vcpuid, VCPU_NMI_COUNT, 1); 1272} 1273 1274int 1275vm_get_capability(struct vm *vm, int vcpu, int type, int *retval) 1276{ 1277 if (vcpu < 0 || vcpu >= VM_MAXCPU) 1278 return (EINVAL); 1279 1280 if (type < 0 || type >= VM_CAP_MAX) 1281 return (EINVAL); 1282 1283 return (VMGETCAP(vm->cookie, vcpu, type, retval)); 1284} 1285 1286int 1287vm_set_capability(struct vm *vm, int vcpu, int type, int val) 1288{ 1289 if (vcpu < 0 || vcpu >= VM_MAXCPU) 1290 return (EINVAL); 1291 1292 if (type < 0 || type >= VM_CAP_MAX) 1293 return (EINVAL); 1294 1295 return (VMSETCAP(vm->cookie, vcpu, type, val)); 1296} 1297 1298uint64_t * 1299vm_guest_msrs(struct vm *vm, int cpu) 1300{ 1301 return (vm->vcpu[cpu].guest_msrs); 1302} 1303 1304struct vlapic * 1305vm_lapic(struct vm *vm, int cpu) 1306{ 1307 return (vm->vcpu[cpu].vlapic); 1308} 1309 1310struct vioapic * 1311vm_ioapic(struct vm *vm) 1312{ 1313 1314 return (vm->vioapic); 1315} 1316 1317struct vhpet * 1318vm_hpet(struct vm *vm) 1319{ 1320 1321 return (vm->vhpet); 1322} 1323 1324boolean_t 1325vmm_is_pptdev(int bus, int slot, int func) 1326{ 1327 int found, i, n; 1328 int b, s, f; 1329 char *val, *cp, *cp2; 1330 1331 /* 1332 * XXX 1333 * The length of an environment variable is limited to 128 bytes which 1334 * puts an upper limit on the number of passthru devices that may be 1335 * specified using a single environment variable. 1336 * 1337 * Work around this by scanning multiple environment variable 1338 * names instead of a single one - yuck! 1339 */ 1340 const char *names[] = { "pptdevs", "pptdevs2", "pptdevs3", NULL }; 1341 1342 /* set pptdevs="1/2/3 4/5/6 7/8/9 10/11/12" */ 1343 found = 0; 1344 for (i = 0; names[i] != NULL && !found; i++) { 1345 cp = val = getenv(names[i]); 1346 while (cp != NULL && *cp != '\0') { 1347 if ((cp2 = strchr(cp, ' ')) != NULL) 1348 *cp2 = '\0'; 1349 1350 n = sscanf(cp, "%d/%d/%d", &b, &s, &f); 1351 if (n == 3 && bus == b && slot == s && func == f) { 1352 found = 1; 1353 break; 1354 } 1355 1356 if (cp2 != NULL) 1357 *cp2++ = ' '; 1358 1359 cp = cp2; 1360 } 1361 freeenv(val); 1362 } 1363 return (found); 1364} 1365 1366void * 1367vm_iommu_domain(struct vm *vm) 1368{ 1369 1370 return (vm->iommu); 1371} 1372 1373int 1374vcpu_set_state(struct vm *vm, int vcpuid, enum vcpu_state newstate, 1375 bool from_idle) 1376{ 1377 int error; 1378 struct vcpu *vcpu; 1379 1380 if (vcpuid < 0 || vcpuid >= VM_MAXCPU) 1381 panic("vm_set_run_state: invalid vcpuid %d", vcpuid); 1382 1383 vcpu = &vm->vcpu[vcpuid]; 1384 1385 vcpu_lock(vcpu); 1386 error = vcpu_set_state_locked(vcpu, newstate, from_idle); 1387 vcpu_unlock(vcpu); 1388 1389 return (error); 1390} 1391 1392enum vcpu_state 1393vcpu_get_state(struct vm *vm, int vcpuid, int *hostcpu) 1394{ 1395 struct vcpu *vcpu; 1396 enum vcpu_state state; 1397 1398 if (vcpuid < 0 || vcpuid >= VM_MAXCPU) 1399 panic("vm_get_run_state: invalid vcpuid %d", vcpuid); 1400 1401 vcpu = &vm->vcpu[vcpuid]; 1402 1403 vcpu_lock(vcpu); 1404 state = vcpu->state; 1405 if (hostcpu != NULL) 1406 *hostcpu = vcpu->hostcpu; 1407 vcpu_unlock(vcpu); 1408 1409 return (state); 1410} 1411 1412void 1413vm_activate_cpu(struct vm *vm, int vcpuid) 1414{ 1415 1416 KASSERT(vcpuid >= 0 && vcpuid < VM_MAXCPU, 1417 ("vm_activate_cpu: invalid vcpuid %d", vcpuid)); 1418 KASSERT(!CPU_ISSET(vcpuid, &vm->active_cpus), 1419 ("vm_activate_cpu: vcpuid %d is already active", vcpuid)); 1420 1421 VCPU_CTR0(vm, vcpuid, "activated"); 1422 CPU_SET_ATOMIC(vcpuid, &vm->active_cpus); 1423} 1424 1425static void 1426vm_deactivate_cpu(struct vm *vm, int vcpuid) 1427{ 1428 1429 KASSERT(vcpuid >= 0 && vcpuid < VM_MAXCPU, 1430 ("vm_deactivate_cpu: invalid vcpuid %d", vcpuid)); 1431 KASSERT(CPU_ISSET(vcpuid, &vm->active_cpus), 1432 ("vm_deactivate_cpu: vcpuid %d is not active", vcpuid)); 1433 1434 VCPU_CTR0(vm, vcpuid, "deactivated"); 1435 CPU_CLR_ATOMIC(vcpuid, &vm->active_cpus); 1436 1437 /* 1438 * If a vcpu rendezvous is in progress then it could be blocked 1439 * on 'vcpuid' - unblock it before disappearing forever. 1440 */ 1441 mtx_lock(&vm->rendezvous_mtx); 1442 if (vm->rendezvous_func != NULL) { 1443 VCPU_CTR0(vm, vcpuid, "unblock rendezvous after deactivation"); 1444 wakeup(&vm->rendezvous_func); 1445 } 1446 mtx_unlock(&vm->rendezvous_mtx); 1447} 1448 1449cpuset_t 1450vm_active_cpus(struct vm *vm) 1451{ 1452 1453 return (vm->active_cpus); 1454} 1455 1456void * 1457vcpu_stats(struct vm *vm, int vcpuid) 1458{ 1459 1460 return (vm->vcpu[vcpuid].stats); 1461} 1462 1463int 1464vm_get_x2apic_state(struct vm *vm, int vcpuid, enum x2apic_state *state) 1465{ 1466 if (vcpuid < 0 || vcpuid >= VM_MAXCPU) 1467 return (EINVAL); 1468 1469 *state = vm->vcpu[vcpuid].x2apic_state; 1470 1471 return (0); 1472} 1473 1474int 1475vm_set_x2apic_state(struct vm *vm, int vcpuid, enum x2apic_state state) 1476{ 1477 if (vcpuid < 0 || vcpuid >= VM_MAXCPU) 1478 return (EINVAL); 1479 1480 if (state >= X2APIC_STATE_LAST) 1481 return (EINVAL); 1482 1483 vm->vcpu[vcpuid].x2apic_state = state; 1484 1485 vlapic_set_x2apic_state(vm, vcpuid, state); 1486 1487 return (0); 1488} 1489 1490/* 1491 * This function is called to ensure that a vcpu "sees" a pending event 1492 * as soon as possible: 1493 * - If the vcpu thread is sleeping then it is woken up. 1494 * - If the vcpu is running on a different host_cpu then an IPI will be directed 1495 * to the host_cpu to cause the vcpu to trap into the hypervisor. 1496 */ 1497void 1498vcpu_notify_event(struct vm *vm, int vcpuid, bool lapic_intr) 1499{ 1500 int hostcpu; 1501 struct vcpu *vcpu; 1502 1503 vcpu = &vm->vcpu[vcpuid]; 1504 1505 vcpu_lock(vcpu); 1506 hostcpu = vcpu->hostcpu; 1507 if (vcpu->state == VCPU_RUNNING) { 1508 KASSERT(hostcpu != NOCPU, ("vcpu running on invalid hostcpu")); 1509 if (hostcpu != curcpu) { 1510 if (lapic_intr) { 1511 vlapic_post_intr(vcpu->vlapic, hostcpu, 1512 vmm_ipinum); 1513 } else { 1514 ipi_cpu(hostcpu, vmm_ipinum); 1515 } 1516 } else { 1517 /* 1518 * If the 'vcpu' is running on 'curcpu' then it must 1519 * be sending a notification to itself (e.g. SELF_IPI). 1520 * The pending event will be picked up when the vcpu 1521 * transitions back to guest context. 1522 */ 1523 } 1524 } else { 1525 KASSERT(hostcpu == NOCPU, ("vcpu state %d not consistent " 1526 "with hostcpu %d", vcpu->state, hostcpu)); 1527 if (vcpu->state == VCPU_SLEEPING) 1528 wakeup_one(vcpu); 1529 } 1530 vcpu_unlock(vcpu); 1531} 1532 1533struct vmspace * 1534vm_get_vmspace(struct vm *vm) 1535{ 1536 1537 return (vm->vmspace); 1538} 1539 1540int 1541vm_apicid2vcpuid(struct vm *vm, int apicid) 1542{ 1543 /* 1544 * XXX apic id is assumed to be numerically identical to vcpu id 1545 */ 1546 return (apicid); 1547} 1548 1549void 1550vm_smp_rendezvous(struct vm *vm, int vcpuid, cpuset_t dest, 1551 vm_rendezvous_func_t func, void *arg) 1552{ 1553 int i; 1554 1555 /* 1556 * Enforce that this function is called without any locks 1557 */ 1558 WITNESS_WARN(WARN_PANIC, NULL, "vm_smp_rendezvous"); 1559 KASSERT(vcpuid == -1 || (vcpuid >= 0 && vcpuid < VM_MAXCPU), 1560 ("vm_smp_rendezvous: invalid vcpuid %d", vcpuid)); 1561 1562restart: 1563 mtx_lock(&vm->rendezvous_mtx); 1564 if (vm->rendezvous_func != NULL) { 1565 /* 1566 * If a rendezvous is already in progress then we need to 1567 * call the rendezvous handler in case this 'vcpuid' is one 1568 * of the targets of the rendezvous. 1569 */ 1570 RENDEZVOUS_CTR0(vm, vcpuid, "Rendezvous already in progress"); 1571 mtx_unlock(&vm->rendezvous_mtx); 1572 vm_handle_rendezvous(vm, vcpuid); 1573 goto restart; 1574 } 1575 KASSERT(vm->rendezvous_func == NULL, ("vm_smp_rendezvous: previous " 1576 "rendezvous is still in progress")); 1577 1578 RENDEZVOUS_CTR0(vm, vcpuid, "Initiating rendezvous"); 1579 vm->rendezvous_req_cpus = dest; 1580 CPU_ZERO(&vm->rendezvous_done_cpus); 1581 vm->rendezvous_arg = arg; 1582 vm_set_rendezvous_func(vm, func); 1583 mtx_unlock(&vm->rendezvous_mtx); 1584 1585 /* 1586 * Wake up any sleeping vcpus and trigger a VM-exit in any running 1587 * vcpus so they handle the rendezvous as soon as possible. 1588 */ 1589 for (i = 0; i < VM_MAXCPU; i++) { 1590 if (CPU_ISSET(i, &dest)) 1591 vcpu_notify_event(vm, i, false); 1592 } 1593 1594 vm_handle_rendezvous(vm, vcpuid); 1595} 1596