bhyverun.c revision 256869
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/usr.sbin/bhyve/bhyverun.c 256869 2013-10-22 00:58:51Z neel $ 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: stable/10/usr.sbin/bhyve/bhyverun.c 256869 2013-10-22 00:58:51Z neel $"); 31 32#include <sys/types.h> 33#include <sys/mman.h> 34#include <sys/time.h> 35 36#include <machine/segments.h> 37 38#include <stdio.h> 39#include <stdlib.h> 40#include <err.h> 41#include <libgen.h> 42#include <unistd.h> 43#include <assert.h> 44#include <errno.h> 45#include <pthread.h> 46#include <pthread_np.h> 47#include <sysexits.h> 48 49#include <machine/vmm.h> 50#include <vmmapi.h> 51 52#include "bhyverun.h" 53#include "acpi.h" 54#include "inout.h" 55#include "dbgport.h" 56#include "mem.h" 57#include "mevent.h" 58#include "mptbl.h" 59#include "pci_emul.h" 60#include "xmsr.h" 61#include "ioapic.h" 62#include "spinup_ap.h" 63#include "rtc.h" 64 65#define GUEST_NIO_PORT 0x488 /* guest upcalls via i/o port */ 66 67#define VMEXIT_SWITCH 0 /* force vcpu switch in mux mode */ 68#define VMEXIT_CONTINUE 1 /* continue from next instruction */ 69#define VMEXIT_RESTART 2 /* restart current instruction */ 70#define VMEXIT_ABORT 3 /* abort the vm run loop */ 71#define VMEXIT_RESET 4 /* guest machine has reset */ 72 73#define MB (1024UL * 1024) 74#define GB (1024UL * MB) 75 76typedef int (*vmexit_handler_t)(struct vmctx *, struct vm_exit *, int *vcpu); 77 78char *vmname; 79 80int guest_ncpus; 81 82static int pincpu = -1; 83static int guest_vmexit_on_hlt, guest_vmexit_on_pause, disable_x2apic; 84static int virtio_msix = 1; 85 86static int foundcpus; 87 88static int strictio; 89 90static int acpi; 91 92static char *progname; 93static const int BSP = 0; 94 95static int cpumask; 96 97static void vm_loop(struct vmctx *ctx, int vcpu, uint64_t rip); 98 99struct vm_exit vmexit[VM_MAXCPU]; 100 101struct bhyvestats { 102 uint64_t vmexit_bogus; 103 uint64_t vmexit_bogus_switch; 104 uint64_t vmexit_hlt; 105 uint64_t vmexit_pause; 106 uint64_t vmexit_mtrap; 107 uint64_t vmexit_inst_emul; 108 uint64_t cpu_switch_rotate; 109 uint64_t cpu_switch_direct; 110 int io_reset; 111} stats; 112 113struct mt_vmm_info { 114 pthread_t mt_thr; 115 struct vmctx *mt_ctx; 116 int mt_vcpu; 117} mt_vmm_info[VM_MAXCPU]; 118 119static void 120usage(int code) 121{ 122 123 fprintf(stderr, 124 "Usage: %s [-aehAHIPW][-g <gdb port>][-s <pci>][-S <pci>]" 125 "[-c vcpus][-p pincpu][-m mem]" 126 " <vmname>\n" 127 " -a: local apic is in XAPIC mode (default is X2APIC)\n" 128 " -A: create an ACPI table\n" 129 " -g: gdb port\n" 130 " -c: # cpus (default 1)\n" 131 " -p: pin vcpu 'n' to host cpu 'pincpu + n'\n" 132 " -H: vmexit from the guest on hlt\n" 133 " -I: present an ioapic to the guest\n" 134 " -P: vmexit from the guest on pause\n" 135 " -W: force virtio to use single-vector MSI\n" 136 " -e: exit on unhandled i/o access\n" 137 " -h: help\n" 138 " -s: <slot,driver,configinfo> PCI slot config\n" 139 " -S: <slot,driver,configinfo> legacy PCI slot config\n" 140 " -m: memory size in MB\n", 141 progname); 142 143 exit(code); 144} 145 146void * 147paddr_guest2host(struct vmctx *ctx, uintptr_t gaddr, size_t len) 148{ 149 150 return (vm_map_gpa(ctx, gaddr, len)); 151} 152 153int 154fbsdrun_disable_x2apic(void) 155{ 156 157 return (disable_x2apic); 158} 159 160int 161fbsdrun_vmexit_on_pause(void) 162{ 163 164 return (guest_vmexit_on_pause); 165} 166 167int 168fbsdrun_vmexit_on_hlt(void) 169{ 170 171 return (guest_vmexit_on_hlt); 172} 173 174int 175fbsdrun_virtio_msix(void) 176{ 177 178 return (virtio_msix); 179} 180 181static void * 182fbsdrun_start_thread(void *param) 183{ 184 char tname[MAXCOMLEN + 1]; 185 struct mt_vmm_info *mtp; 186 int vcpu; 187 188 mtp = param; 189 vcpu = mtp->mt_vcpu; 190 191 snprintf(tname, sizeof(tname), "%s vcpu %d", vmname, vcpu); 192 pthread_set_name_np(mtp->mt_thr, tname); 193 194 vm_loop(mtp->mt_ctx, vcpu, vmexit[vcpu].rip); 195 196 /* not reached */ 197 exit(1); 198 return (NULL); 199} 200 201void 202fbsdrun_addcpu(struct vmctx *ctx, int vcpu, uint64_t rip) 203{ 204 int error; 205 206 if (cpumask & (1 << vcpu)) { 207 fprintf(stderr, "addcpu: attempting to add existing cpu %d\n", 208 vcpu); 209 exit(1); 210 } 211 212 cpumask |= 1 << vcpu; 213 foundcpus++; 214 215 /* 216 * Set up the vmexit struct to allow execution to start 217 * at the given RIP 218 */ 219 vmexit[vcpu].rip = rip; 220 vmexit[vcpu].inst_length = 0; 221 222 mt_vmm_info[vcpu].mt_ctx = ctx; 223 mt_vmm_info[vcpu].mt_vcpu = vcpu; 224 225 error = pthread_create(&mt_vmm_info[vcpu].mt_thr, NULL, 226 fbsdrun_start_thread, &mt_vmm_info[vcpu]); 227 assert(error == 0); 228} 229 230static int 231vmexit_catch_reset(void) 232{ 233 stats.io_reset++; 234 return (VMEXIT_RESET); 235} 236 237static int 238vmexit_catch_inout(void) 239{ 240 return (VMEXIT_ABORT); 241} 242 243static int 244vmexit_handle_notify(struct vmctx *ctx, struct vm_exit *vme, int *pvcpu, 245 uint32_t eax) 246{ 247#if BHYVE_DEBUG 248 /* 249 * put guest-driven debug here 250 */ 251#endif 252 return (VMEXIT_CONTINUE); 253} 254 255static int 256vmexit_inout(struct vmctx *ctx, struct vm_exit *vme, int *pvcpu) 257{ 258 int error; 259 int bytes, port, in, out; 260 uint32_t eax; 261 int vcpu; 262 263 vcpu = *pvcpu; 264 265 port = vme->u.inout.port; 266 bytes = vme->u.inout.bytes; 267 eax = vme->u.inout.eax; 268 in = vme->u.inout.in; 269 out = !in; 270 271 /* We don't deal with these */ 272 if (vme->u.inout.string || vme->u.inout.rep) 273 return (VMEXIT_ABORT); 274 275 /* Special case of guest reset */ 276 if (out && port == 0x64 && (uint8_t)eax == 0xFE) 277 return (vmexit_catch_reset()); 278 279 /* Extra-special case of host notifications */ 280 if (out && port == GUEST_NIO_PORT) 281 return (vmexit_handle_notify(ctx, vme, pvcpu, eax)); 282 283 error = emulate_inout(ctx, vcpu, in, port, bytes, &eax, strictio); 284 if (error == 0 && in) 285 error = vm_set_register(ctx, vcpu, VM_REG_GUEST_RAX, eax); 286 287 if (error == 0) 288 return (VMEXIT_CONTINUE); 289 else { 290 fprintf(stderr, "Unhandled %s%c 0x%04x\n", 291 in ? "in" : "out", 292 bytes == 1 ? 'b' : (bytes == 2 ? 'w' : 'l'), port); 293 return (vmexit_catch_inout()); 294 } 295} 296 297static int 298vmexit_rdmsr(struct vmctx *ctx, struct vm_exit *vme, int *pvcpu) 299{ 300 fprintf(stderr, "vm exit rdmsr 0x%x, cpu %d\n", vme->u.msr.code, 301 *pvcpu); 302 return (VMEXIT_ABORT); 303} 304 305static int 306vmexit_wrmsr(struct vmctx *ctx, struct vm_exit *vme, int *pvcpu) 307{ 308 int newcpu; 309 int retval = VMEXIT_CONTINUE; 310 311 newcpu = emulate_wrmsr(ctx, *pvcpu, vme->u.msr.code,vme->u.msr.wval); 312 313 return (retval); 314} 315 316static int 317vmexit_spinup_ap(struct vmctx *ctx, struct vm_exit *vme, int *pvcpu) 318{ 319 int newcpu; 320 int retval = VMEXIT_CONTINUE; 321 322 newcpu = spinup_ap(ctx, *pvcpu, 323 vme->u.spinup_ap.vcpu, vme->u.spinup_ap.rip); 324 325 return (retval); 326} 327 328static int 329vmexit_vmx(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu) 330{ 331 332 fprintf(stderr, "vm exit[%d]\n", *pvcpu); 333 fprintf(stderr, "\treason\t\tVMX\n"); 334 fprintf(stderr, "\trip\t\t0x%016lx\n", vmexit->rip); 335 fprintf(stderr, "\tinst_length\t%d\n", vmexit->inst_length); 336 fprintf(stderr, "\terror\t\t%d\n", vmexit->u.vmx.error); 337 fprintf(stderr, "\texit_reason\t%u\n", vmexit->u.vmx.exit_reason); 338 fprintf(stderr, "\tqualification\t0x%016lx\n", 339 vmexit->u.vmx.exit_qualification); 340 341 return (VMEXIT_ABORT); 342} 343 344static int 345vmexit_bogus(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu) 346{ 347 348 stats.vmexit_bogus++; 349 350 return (VMEXIT_RESTART); 351} 352 353static int 354vmexit_hlt(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu) 355{ 356 357 stats.vmexit_hlt++; 358 359 /* 360 * Just continue execution with the next instruction. We use 361 * the HLT VM exit as a way to be friendly with the host 362 * scheduler. 363 */ 364 return (VMEXIT_CONTINUE); 365} 366 367static int 368vmexit_pause(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu) 369{ 370 371 stats.vmexit_pause++; 372 373 return (VMEXIT_CONTINUE); 374} 375 376static int 377vmexit_mtrap(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu) 378{ 379 380 stats.vmexit_mtrap++; 381 382 return (VMEXIT_RESTART); 383} 384 385static int 386vmexit_inst_emul(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu) 387{ 388 int err; 389 stats.vmexit_inst_emul++; 390 391 err = emulate_mem(ctx, *pvcpu, vmexit->u.inst_emul.gpa, 392 &vmexit->u.inst_emul.vie); 393 394 if (err) { 395 if (err == EINVAL) { 396 fprintf(stderr, 397 "Failed to emulate instruction at 0x%lx\n", 398 vmexit->rip); 399 } else if (err == ESRCH) { 400 fprintf(stderr, "Unhandled memory access to 0x%lx\n", 401 vmexit->u.inst_emul.gpa); 402 } 403 404 return (VMEXIT_ABORT); 405 } 406 407 return (VMEXIT_CONTINUE); 408} 409 410static vmexit_handler_t handler[VM_EXITCODE_MAX] = { 411 [VM_EXITCODE_INOUT] = vmexit_inout, 412 [VM_EXITCODE_VMX] = vmexit_vmx, 413 [VM_EXITCODE_BOGUS] = vmexit_bogus, 414 [VM_EXITCODE_RDMSR] = vmexit_rdmsr, 415 [VM_EXITCODE_WRMSR] = vmexit_wrmsr, 416 [VM_EXITCODE_MTRAP] = vmexit_mtrap, 417 [VM_EXITCODE_INST_EMUL] = vmexit_inst_emul, 418 [VM_EXITCODE_SPINUP_AP] = vmexit_spinup_ap, 419}; 420 421static void 422vm_loop(struct vmctx *ctx, int vcpu, uint64_t rip) 423{ 424 cpuset_t mask; 425 int error, rc, prevcpu; 426 enum vm_exitcode exitcode; 427 428 if (pincpu >= 0) { 429 CPU_ZERO(&mask); 430 CPU_SET(pincpu + vcpu, &mask); 431 error = pthread_setaffinity_np(pthread_self(), 432 sizeof(mask), &mask); 433 assert(error == 0); 434 } 435 436 while (1) { 437 error = vm_run(ctx, vcpu, rip, &vmexit[vcpu]); 438 if (error != 0) { 439 /* 440 * It is possible that 'vmmctl' or some other process 441 * has transitioned the vcpu to CANNOT_RUN state right 442 * before we tried to transition it to RUNNING. 443 * 444 * This is expected to be temporary so just retry. 445 */ 446 if (errno == EBUSY) 447 continue; 448 else 449 break; 450 } 451 452 prevcpu = vcpu; 453 454 exitcode = vmexit[vcpu].exitcode; 455 if (exitcode >= VM_EXITCODE_MAX || handler[exitcode] == NULL) { 456 fprintf(stderr, "vm_loop: unexpected exitcode 0x%x\n", 457 exitcode); 458 exit(1); 459 } 460 461 rc = (*handler[exitcode])(ctx, &vmexit[vcpu], &vcpu); 462 463 switch (rc) { 464 case VMEXIT_CONTINUE: 465 rip = vmexit[vcpu].rip + vmexit[vcpu].inst_length; 466 break; 467 case VMEXIT_RESTART: 468 rip = vmexit[vcpu].rip; 469 break; 470 case VMEXIT_RESET: 471 exit(0); 472 default: 473 exit(1); 474 } 475 } 476 fprintf(stderr, "vm_run error %d, errno %d\n", error, errno); 477} 478 479static int 480num_vcpus_allowed(struct vmctx *ctx) 481{ 482 int tmp, error; 483 484 error = vm_get_capability(ctx, BSP, VM_CAP_UNRESTRICTED_GUEST, &tmp); 485 486 /* 487 * The guest is allowed to spinup more than one processor only if the 488 * UNRESTRICTED_GUEST capability is available. 489 */ 490 if (error == 0) 491 return (VM_MAXCPU); 492 else 493 return (1); 494} 495 496void 497fbsdrun_set_capabilities(struct vmctx *ctx, int cpu) 498{ 499 int err, tmp; 500 501 if (fbsdrun_vmexit_on_hlt()) { 502 err = vm_get_capability(ctx, cpu, VM_CAP_HALT_EXIT, &tmp); 503 if (err < 0) { 504 fprintf(stderr, "VM exit on HLT not supported\n"); 505 exit(1); 506 } 507 vm_set_capability(ctx, cpu, VM_CAP_HALT_EXIT, 1); 508 if (cpu == BSP) 509 handler[VM_EXITCODE_HLT] = vmexit_hlt; 510 } 511 512 if (fbsdrun_vmexit_on_pause()) { 513 /* 514 * pause exit support required for this mode 515 */ 516 err = vm_get_capability(ctx, cpu, VM_CAP_PAUSE_EXIT, &tmp); 517 if (err < 0) { 518 fprintf(stderr, 519 "SMP mux requested, no pause support\n"); 520 exit(1); 521 } 522 vm_set_capability(ctx, cpu, VM_CAP_PAUSE_EXIT, 1); 523 if (cpu == BSP) 524 handler[VM_EXITCODE_PAUSE] = vmexit_pause; 525 } 526 527 if (fbsdrun_disable_x2apic()) 528 err = vm_set_x2apic_state(ctx, cpu, X2APIC_DISABLED); 529 else 530 err = vm_set_x2apic_state(ctx, cpu, X2APIC_ENABLED); 531 532 if (err) { 533 fprintf(stderr, "Unable to set x2apic state (%d)\n", err); 534 exit(1); 535 } 536 537 vm_set_capability(ctx, cpu, VM_CAP_ENABLE_INVPCID, 1); 538} 539 540int 541main(int argc, char *argv[]) 542{ 543 int c, error, gdb_port, err, ioapic, bvmcons; 544 int max_vcpus; 545 struct vmctx *ctx; 546 uint64_t rip; 547 size_t memsize; 548 549 bvmcons = 0; 550 progname = basename(argv[0]); 551 gdb_port = 0; 552 guest_ncpus = 1; 553 ioapic = 0; 554 memsize = 256 * MB; 555 556 while ((c = getopt(argc, argv, "abehAHIPWp:g:c:s:S:m:")) != -1) { 557 switch (c) { 558 case 'a': 559 disable_x2apic = 1; 560 break; 561 case 'A': 562 acpi = 1; 563 break; 564 case 'b': 565 bvmcons = 1; 566 break; 567 case 'p': 568 pincpu = atoi(optarg); 569 break; 570 case 'c': 571 guest_ncpus = atoi(optarg); 572 break; 573 case 'g': 574 gdb_port = atoi(optarg); 575 break; 576 case 's': 577 if (pci_parse_slot(optarg, 0) != 0) 578 exit(1); 579 else 580 break; 581 case 'S': 582 if (pci_parse_slot(optarg, 1) != 0) 583 exit(1); 584 else 585 break; 586 case 'm': 587 error = vm_parse_memsize(optarg, &memsize); 588 if (error) 589 errx(EX_USAGE, "invalid memsize '%s'", optarg); 590 break; 591 case 'H': 592 guest_vmexit_on_hlt = 1; 593 break; 594 case 'I': 595 ioapic = 1; 596 break; 597 case 'P': 598 guest_vmexit_on_pause = 1; 599 break; 600 case 'e': 601 strictio = 1; 602 break; 603 case 'W': 604 virtio_msix = 0; 605 break; 606 case 'h': 607 usage(0); 608 default: 609 usage(1); 610 } 611 } 612 argc -= optind; 613 argv += optind; 614 615 if (argc != 1) 616 usage(1); 617 618 vmname = argv[0]; 619 620 ctx = vm_open(vmname); 621 if (ctx == NULL) { 622 perror("vm_open"); 623 exit(1); 624 } 625 626 max_vcpus = num_vcpus_allowed(ctx); 627 if (guest_ncpus > max_vcpus) { 628 fprintf(stderr, "%d vCPUs requested but only %d available\n", 629 guest_ncpus, max_vcpus); 630 exit(1); 631 } 632 633 fbsdrun_set_capabilities(ctx, BSP); 634 635 err = vm_setup_memory(ctx, memsize, VM_MMAP_ALL); 636 if (err) { 637 fprintf(stderr, "Unable to setup memory (%d)\n", err); 638 exit(1); 639 } 640 641 init_mem(); 642 init_inout(); 643 644 rtc_init(ctx); 645 646 /* 647 * Exit if a device emulation finds an error in it's initilization 648 */ 649 if (init_pci(ctx) != 0) 650 exit(1); 651 652 if (ioapic) 653 ioapic_init(0); 654 655 if (gdb_port != 0) 656 init_dbgport(gdb_port); 657 658 if (bvmcons) 659 init_bvmcons(); 660 661 error = vm_get_register(ctx, BSP, VM_REG_GUEST_RIP, &rip); 662 assert(error == 0); 663 664 /* 665 * build the guest tables, MP etc. 666 */ 667 mptable_build(ctx, guest_ncpus, ioapic); 668 669 if (acpi) { 670 error = acpi_build(ctx, guest_ncpus, ioapic); 671 assert(error == 0); 672 } 673 674 /* 675 * Add CPU 0 676 */ 677 fbsdrun_addcpu(ctx, BSP, rip); 678 679 /* 680 * Head off to the main event dispatch loop 681 */ 682 mevent_dispatch(); 683 684 exit(1); 685} 686