vmmapi.c revision 241486
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 * $FreeBSD$ 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD$"); 31 32#include <sys/types.h> 33#include <sys/sysctl.h> 34#include <sys/ioctl.h> 35#include <sys/mman.h> 36 37#include <machine/specialreg.h> 38 39#include <stdio.h> 40#include <stdlib.h> 41#include <assert.h> 42#include <string.h> 43#include <fcntl.h> 44#include <unistd.h> 45 46#include <machine/vmm.h> 47#include <machine/vmm_dev.h> 48 49#include "vmmapi.h" 50#include "mptable.h" 51 52#define BIOS_ROM_BASE (0xf0000) 53#define BIOS_ROM_SIZE (0x10000) 54 55struct vmctx { 56 int fd; 57 char *name; 58}; 59 60#define CREATE(x) sysctlbyname("hw.vmm.create", NULL, NULL, (x), strlen((x))) 61#define DESTROY(x) sysctlbyname("hw.vmm.destroy", NULL, NULL, (x), strlen((x))) 62 63static int 64vm_device_open(const char *name) 65{ 66 int fd, len; 67 char *vmfile; 68 69 len = strlen("/dev/vmm/") + strlen(name) + 1; 70 vmfile = malloc(len); 71 assert(vmfile != NULL); 72 snprintf(vmfile, len, "/dev/vmm/%s", name); 73 74 /* Open the device file */ 75 fd = open(vmfile, O_RDWR, 0); 76 77 free(vmfile); 78 return (fd); 79} 80 81int 82vm_create(const char *name) 83{ 84 85 return (CREATE((char *)name)); 86} 87 88struct vmctx * 89vm_open(const char *name) 90{ 91 struct vmctx *vm; 92 93 vm = malloc(sizeof(struct vmctx) + strlen(name) + 1); 94 assert(vm != NULL); 95 96 vm->fd = -1; 97 vm->name = (char *)(vm + 1); 98 strcpy(vm->name, name); 99 100 if ((vm->fd = vm_device_open(vm->name)) < 0) 101 goto err; 102 103 return (vm); 104err: 105 vm_destroy(vm); 106 return (NULL); 107} 108 109void 110vm_destroy(struct vmctx *vm) 111{ 112 assert(vm != NULL); 113 114 if (vm->fd >= 0) 115 close(vm->fd); 116 DESTROY(vm->name); 117 118 free(vm); 119} 120 121size_t 122vmm_get_mem_total(void) 123{ 124 size_t mem_total = 0; 125 size_t oldlen = sizeof(mem_total); 126 int error; 127 error = sysctlbyname("hw.vmm.mem_total", &mem_total, &oldlen, NULL, 0); 128 if (error) 129 return -1; 130 return mem_total; 131} 132 133size_t 134vmm_get_mem_free(void) 135{ 136 size_t mem_free = 0; 137 size_t oldlen = sizeof(mem_free); 138 int error; 139 error = sysctlbyname("hw.vmm.mem_free", &mem_free, &oldlen, NULL, 0); 140 if (error) 141 return -1; 142 return mem_free; 143} 144 145int 146vm_get_memory_seg(struct vmctx *ctx, vm_paddr_t gpa, size_t *ret_len) 147{ 148 int error; 149 struct vm_memory_segment seg; 150 151 bzero(&seg, sizeof(seg)); 152 seg.gpa = gpa; 153 error = ioctl(ctx->fd, VM_GET_MEMORY_SEG, &seg); 154 *ret_len = seg.len; 155 return (error); 156} 157 158int 159vm_setup_memory(struct vmctx *ctx, vm_paddr_t gpa, size_t len, char **mapaddr) 160{ 161 int error; 162 struct vm_memory_segment seg; 163 164 /* 165 * Create and optionally map 'len' bytes of memory at guest 166 * physical address 'gpa' 167 */ 168 bzero(&seg, sizeof(seg)); 169 seg.gpa = gpa; 170 seg.len = len; 171 error = ioctl(ctx->fd, VM_MAP_MEMORY, &seg); 172 if (error == 0 && mapaddr != NULL) { 173 *mapaddr = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, 174 ctx->fd, gpa); 175 } 176 return (error); 177} 178 179char * 180vm_map_memory(struct vmctx *ctx, vm_paddr_t gpa, size_t len) 181{ 182 183 /* Map 'len' bytes of memory at guest physical address 'gpa' */ 184 return ((char *)mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, 185 ctx->fd, gpa)); 186} 187 188int 189vm_set_desc(struct vmctx *ctx, int vcpu, int reg, 190 uint64_t base, uint32_t limit, uint32_t access) 191{ 192 int error; 193 struct vm_seg_desc vmsegdesc; 194 195 bzero(&vmsegdesc, sizeof(vmsegdesc)); 196 vmsegdesc.cpuid = vcpu; 197 vmsegdesc.regnum = reg; 198 vmsegdesc.desc.base = base; 199 vmsegdesc.desc.limit = limit; 200 vmsegdesc.desc.access = access; 201 202 error = ioctl(ctx->fd, VM_SET_SEGMENT_DESCRIPTOR, &vmsegdesc); 203 return (error); 204} 205 206int 207vm_get_desc(struct vmctx *ctx, int vcpu, int reg, 208 uint64_t *base, uint32_t *limit, uint32_t *access) 209{ 210 int error; 211 struct vm_seg_desc vmsegdesc; 212 213 bzero(&vmsegdesc, sizeof(vmsegdesc)); 214 vmsegdesc.cpuid = vcpu; 215 vmsegdesc.regnum = reg; 216 217 error = ioctl(ctx->fd, VM_GET_SEGMENT_DESCRIPTOR, &vmsegdesc); 218 if (error == 0) { 219 *base = vmsegdesc.desc.base; 220 *limit = vmsegdesc.desc.limit; 221 *access = vmsegdesc.desc.access; 222 } 223 return (error); 224} 225 226int 227vm_set_register(struct vmctx *ctx, int vcpu, int reg, uint64_t val) 228{ 229 int error; 230 struct vm_register vmreg; 231 232 bzero(&vmreg, sizeof(vmreg)); 233 vmreg.cpuid = vcpu; 234 vmreg.regnum = reg; 235 vmreg.regval = val; 236 237 error = ioctl(ctx->fd, VM_SET_REGISTER, &vmreg); 238 return (error); 239} 240 241int 242vm_get_register(struct vmctx *ctx, int vcpu, int reg, uint64_t *ret_val) 243{ 244 int error; 245 struct vm_register vmreg; 246 247 bzero(&vmreg, sizeof(vmreg)); 248 vmreg.cpuid = vcpu; 249 vmreg.regnum = reg; 250 251 error = ioctl(ctx->fd, VM_GET_REGISTER, &vmreg); 252 *ret_val = vmreg.regval; 253 return (error); 254} 255 256int 257vm_get_pinning(struct vmctx *ctx, int vcpu, int *host_cpuid) 258{ 259 int error; 260 struct vm_pin vmpin; 261 262 bzero(&vmpin, sizeof(vmpin)); 263 vmpin.vm_cpuid = vcpu; 264 265 error = ioctl(ctx->fd, VM_GET_PINNING, &vmpin); 266 *host_cpuid = vmpin.host_cpuid; 267 return (error); 268} 269 270int 271vm_set_pinning(struct vmctx *ctx, int vcpu, int host_cpuid) 272{ 273 int error; 274 struct vm_pin vmpin; 275 276 bzero(&vmpin, sizeof(vmpin)); 277 vmpin.vm_cpuid = vcpu; 278 vmpin.host_cpuid = host_cpuid; 279 280 error = ioctl(ctx->fd, VM_SET_PINNING, &vmpin); 281 return (error); 282} 283 284int 285vm_run(struct vmctx *ctx, int vcpu, uint64_t rip, struct vm_exit *vmexit) 286{ 287 int error; 288 struct vm_run vmrun; 289 290 bzero(&vmrun, sizeof(vmrun)); 291 vmrun.cpuid = vcpu; 292 vmrun.rip = rip; 293 294 error = ioctl(ctx->fd, VM_RUN, &vmrun); 295 bcopy(&vmrun.vm_exit, vmexit, sizeof(struct vm_exit)); 296 return (error); 297} 298 299static int 300vm_inject_event_real(struct vmctx *ctx, int vcpu, enum vm_event_type type, 301 int vector, int error_code, int error_code_valid) 302{ 303 struct vm_event ev; 304 305 bzero(&ev, sizeof(ev)); 306 ev.cpuid = vcpu; 307 ev.type = type; 308 ev.vector = vector; 309 ev.error_code = error_code; 310 ev.error_code_valid = error_code_valid; 311 312 return (ioctl(ctx->fd, VM_INJECT_EVENT, &ev)); 313} 314 315int 316vm_inject_event(struct vmctx *ctx, int vcpu, enum vm_event_type type, 317 int vector) 318{ 319 320 return (vm_inject_event_real(ctx, vcpu, type, vector, 0, 0)); 321} 322 323int 324vm_inject_event2(struct vmctx *ctx, int vcpu, enum vm_event_type type, 325 int vector, int error_code) 326{ 327 328 return (vm_inject_event_real(ctx, vcpu, type, vector, error_code, 1)); 329} 330 331int 332vm_build_tables(struct vmctx *ctxt, int ncpu, int ioapic, 333 void *oemtbl, int oemtblsz) 334{ 335 336 return (vm_build_mptable(ctxt, BIOS_ROM_BASE, BIOS_ROM_SIZE, ncpu, 337 ioapic, oemtbl, oemtblsz)); 338} 339 340int 341vm_apicid2vcpu(struct vmctx *ctx, int apicid) 342{ 343 /* 344 * The apic id associated with the 'vcpu' has the same numerical value 345 * as the 'vcpu' itself. 346 */ 347 return (apicid); 348} 349 350int 351vm_lapic_irq(struct vmctx *ctx, int vcpu, int vector) 352{ 353 struct vm_lapic_irq vmirq; 354 355 bzero(&vmirq, sizeof(vmirq)); 356 vmirq.cpuid = vcpu; 357 vmirq.vector = vector; 358 359 return (ioctl(ctx->fd, VM_LAPIC_IRQ, &vmirq)); 360} 361 362int 363vm_inject_nmi(struct vmctx *ctx, int vcpu) 364{ 365 struct vm_nmi vmnmi; 366 367 bzero(&vmnmi, sizeof(vmnmi)); 368 vmnmi.cpuid = vcpu; 369 370 return (ioctl(ctx->fd, VM_INJECT_NMI, &vmnmi)); 371} 372 373static struct { 374 const char *name; 375 int type; 376} capstrmap[] = { 377 { "hlt_exit", VM_CAP_HALT_EXIT }, 378 { "mtrap_exit", VM_CAP_MTRAP_EXIT }, 379 { "pause_exit", VM_CAP_PAUSE_EXIT }, 380 { "unrestricted_guest", VM_CAP_UNRESTRICTED_GUEST }, 381 { 0 } 382}; 383 384int 385vm_capability_name2type(const char *capname) 386{ 387 int i; 388 389 for (i = 0; capstrmap[i].name != NULL && capname != NULL; i++) { 390 if (strcmp(capstrmap[i].name, capname) == 0) 391 return (capstrmap[i].type); 392 } 393 394 return (-1); 395} 396 397const char * 398vm_capability_type2name(int type) 399{ 400 int i; 401 402 for (i = 0; capstrmap[i].name != NULL; i++) { 403 if (capstrmap[i].type == type) 404 return (capstrmap[i].name); 405 } 406 407 return (NULL); 408} 409 410int 411vm_get_capability(struct vmctx *ctx, int vcpu, enum vm_cap_type cap, 412 int *retval) 413{ 414 int error; 415 struct vm_capability vmcap; 416 417 bzero(&vmcap, sizeof(vmcap)); 418 vmcap.cpuid = vcpu; 419 vmcap.captype = cap; 420 421 error = ioctl(ctx->fd, VM_GET_CAPABILITY, &vmcap); 422 *retval = vmcap.capval; 423 return (error); 424} 425 426int 427vm_set_capability(struct vmctx *ctx, int vcpu, enum vm_cap_type cap, int val) 428{ 429 struct vm_capability vmcap; 430 431 bzero(&vmcap, sizeof(vmcap)); 432 vmcap.cpuid = vcpu; 433 vmcap.captype = cap; 434 vmcap.capval = val; 435 436 return (ioctl(ctx->fd, VM_SET_CAPABILITY, &vmcap)); 437} 438 439int 440vm_assign_pptdev(struct vmctx *ctx, int bus, int slot, int func) 441{ 442 struct vm_pptdev pptdev; 443 444 bzero(&pptdev, sizeof(pptdev)); 445 pptdev.bus = bus; 446 pptdev.slot = slot; 447 pptdev.func = func; 448 449 return (ioctl(ctx->fd, VM_BIND_PPTDEV, &pptdev)); 450} 451 452int 453vm_unassign_pptdev(struct vmctx *ctx, int bus, int slot, int func) 454{ 455 struct vm_pptdev pptdev; 456 457 bzero(&pptdev, sizeof(pptdev)); 458 pptdev.bus = bus; 459 pptdev.slot = slot; 460 pptdev.func = func; 461 462 return (ioctl(ctx->fd, VM_UNBIND_PPTDEV, &pptdev)); 463} 464 465int 466vm_map_pptdev_mmio(struct vmctx *ctx, int bus, int slot, int func, 467 vm_paddr_t gpa, size_t len, vm_paddr_t hpa) 468{ 469 struct vm_pptdev_mmio pptmmio; 470 471 bzero(&pptmmio, sizeof(pptmmio)); 472 pptmmio.bus = bus; 473 pptmmio.slot = slot; 474 pptmmio.func = func; 475 pptmmio.gpa = gpa; 476 pptmmio.len = len; 477 pptmmio.hpa = hpa; 478 479 return (ioctl(ctx->fd, VM_MAP_PPTDEV_MMIO, &pptmmio)); 480} 481 482int 483vm_setup_msi(struct vmctx *ctx, int vcpu, int bus, int slot, int func, 484 int destcpu, int vector, int numvec) 485{ 486 struct vm_pptdev_msi pptmsi; 487 488 bzero(&pptmsi, sizeof(pptmsi)); 489 pptmsi.vcpu = vcpu; 490 pptmsi.bus = bus; 491 pptmsi.slot = slot; 492 pptmsi.func = func; 493 pptmsi.destcpu = destcpu; 494 pptmsi.vector = vector; 495 pptmsi.numvec = numvec; 496 497 return (ioctl(ctx->fd, VM_PPTDEV_MSI, &pptmsi)); 498} 499 500int 501vm_setup_msix(struct vmctx *ctx, int vcpu, int bus, int slot, int func, 502 int idx, uint32_t msg, uint32_t vector_control, uint64_t addr) 503{ 504 struct vm_pptdev_msix pptmsix; 505 506 bzero(&pptmsix, sizeof(pptmsix)); 507 pptmsix.vcpu = vcpu; 508 pptmsix.bus = bus; 509 pptmsix.slot = slot; 510 pptmsix.func = func; 511 pptmsix.idx = idx; 512 pptmsix.msg = msg; 513 pptmsix.addr = addr; 514 pptmsix.vector_control = vector_control; 515 516 return ioctl(ctx->fd, VM_PPTDEV_MSIX, &pptmsix); 517} 518 519uint64_t * 520vm_get_stats(struct vmctx *ctx, int vcpu, struct timeval *ret_tv, 521 int *ret_entries) 522{ 523 int error; 524 525 static struct vm_stats vmstats; 526 527 vmstats.cpuid = vcpu; 528 529 error = ioctl(ctx->fd, VM_STATS, &vmstats); 530 if (error == 0) { 531 if (ret_entries) 532 *ret_entries = vmstats.num_entries; 533 if (ret_tv) 534 *ret_tv = vmstats.tv; 535 return (vmstats.statbuf); 536 } else 537 return (NULL); 538} 539 540const char * 541vm_get_stat_desc(struct vmctx *ctx, int index) 542{ 543 static struct vm_stat_desc statdesc; 544 545 statdesc.index = index; 546 if (ioctl(ctx->fd, VM_STAT_DESC, &statdesc) == 0) 547 return (statdesc.desc); 548 else 549 return (NULL); 550} 551 552int 553vm_get_x2apic_state(struct vmctx *ctx, int vcpu, enum x2apic_state *state) 554{ 555 int error; 556 struct vm_x2apic x2apic; 557 558 bzero(&x2apic, sizeof(x2apic)); 559 x2apic.cpuid = vcpu; 560 561 error = ioctl(ctx->fd, VM_GET_X2APIC_STATE, &x2apic); 562 *state = x2apic.state; 563 return (error); 564} 565 566int 567vm_set_x2apic_state(struct vmctx *ctx, int vcpu, enum x2apic_state state) 568{ 569 int error; 570 struct vm_x2apic x2apic; 571 572 bzero(&x2apic, sizeof(x2apic)); 573 x2apic.cpuid = vcpu; 574 x2apic.state = state; 575 576 error = ioctl(ctx->fd, VM_SET_X2APIC_STATE, &x2apic); 577 578 return (error); 579} 580 581/* 582 * From Intel Vol 3a: 583 * Table 9-1. IA-32 Processor States Following Power-up, Reset or INIT 584 */ 585int 586vcpu_reset(struct vmctx *vmctx, int vcpu) 587{ 588 int error; 589 uint64_t rflags, rip, cr0, cr4, zero, desc_base, rdx; 590 uint32_t desc_access, desc_limit; 591 uint16_t sel; 592 593 zero = 0; 594 595 rflags = 0x2; 596 error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_RFLAGS, rflags); 597 if (error) 598 goto done; 599 600 rip = 0xfff0; 601 if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_RIP, rip)) != 0) 602 goto done; 603 604 cr0 = CR0_NE; 605 if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_CR0, cr0)) != 0) 606 goto done; 607 608 if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_CR3, zero)) != 0) 609 goto done; 610 611 cr4 = 0; 612 if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_CR4, cr4)) != 0) 613 goto done; 614 615 /* 616 * CS: present, r/w, accessed, 16-bit, byte granularity, usable 617 */ 618 desc_base = 0xffff0000; 619 desc_limit = 0xffff; 620 desc_access = 0x0093; 621 error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_CS, 622 desc_base, desc_limit, desc_access); 623 if (error) 624 goto done; 625 626 sel = 0xf000; 627 if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_CS, sel)) != 0) 628 goto done; 629 630 /* 631 * SS,DS,ES,FS,GS: present, r/w, accessed, 16-bit, byte granularity 632 */ 633 desc_base = 0; 634 desc_limit = 0xffff; 635 desc_access = 0x0093; 636 error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_SS, 637 desc_base, desc_limit, desc_access); 638 if (error) 639 goto done; 640 641 error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_DS, 642 desc_base, desc_limit, desc_access); 643 if (error) 644 goto done; 645 646 error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_ES, 647 desc_base, desc_limit, desc_access); 648 if (error) 649 goto done; 650 651 error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_FS, 652 desc_base, desc_limit, desc_access); 653 if (error) 654 goto done; 655 656 error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_GS, 657 desc_base, desc_limit, desc_access); 658 if (error) 659 goto done; 660 661 sel = 0; 662 if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_SS, sel)) != 0) 663 goto done; 664 if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_DS, sel)) != 0) 665 goto done; 666 if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_ES, sel)) != 0) 667 goto done; 668 if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_FS, sel)) != 0) 669 goto done; 670 if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_GS, sel)) != 0) 671 goto done; 672 673 /* General purpose registers */ 674 rdx = 0xf00; 675 if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_RAX, zero)) != 0) 676 goto done; 677 if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_RBX, zero)) != 0) 678 goto done; 679 if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_RCX, zero)) != 0) 680 goto done; 681 if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_RDX, rdx)) != 0) 682 goto done; 683 if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_RSI, zero)) != 0) 684 goto done; 685 if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_RDI, zero)) != 0) 686 goto done; 687 if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_RBP, zero)) != 0) 688 goto done; 689 if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_RSP, zero)) != 0) 690 goto done; 691 692 /* GDTR, IDTR */ 693 desc_base = 0; 694 desc_limit = 0xffff; 695 desc_access = 0; 696 error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_GDTR, 697 desc_base, desc_limit, desc_access); 698 if (error != 0) 699 goto done; 700 701 error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_IDTR, 702 desc_base, desc_limit, desc_access); 703 if (error != 0) 704 goto done; 705 706 /* TR */ 707 desc_base = 0; 708 desc_limit = 0xffff; 709 desc_access = 0x0000008b; 710 error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_TR, 0, 0, desc_access); 711 if (error) 712 goto done; 713 714 sel = 0; 715 if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_TR, sel)) != 0) 716 goto done; 717 718 /* LDTR */ 719 desc_base = 0; 720 desc_limit = 0xffff; 721 desc_access = 0x00000082; 722 error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_LDTR, desc_base, 723 desc_limit, desc_access); 724 if (error) 725 goto done; 726 727 sel = 0; 728 if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_LDTR, 0)) != 0) 729 goto done; 730 731 /* XXX cr2, debug registers */ 732 733 error = 0; 734done: 735 return (error); 736} 737