bhyverun.c revision 246686 
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: head/usr.sbin/bhyve/bhyverun.c 246686 2013-02-11 20:36:07Z neel $
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: head/usr.sbin/bhyve/bhyverun.c 246686 2013-02-11 20:36:07Z 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 <libgen.h>
41#include <unistd.h>
42#include <assert.h>
43#include <errno.h>
44#include <signal.h>
45#include <pthread.h>
46#include <pthread_np.h>
47
48#include <machine/vmm.h>
49#include <vmmapi.h>
50
51#include "bhyverun.h"
52#include "acpi.h"
53#include "inout.h"
54#include "dbgport.h"
55#include "mem.h"
56#include "mevent.h"
57#include "mptbl.h"
58#include "pci_emul.h"
59#include "xmsr.h"
60#include "ioapic.h"
61#include "spinup_ap.h"
62
63#define	DEFAULT_GUEST_HZ	100
64#define	DEFAULT_GUEST_TSLICE	200
65
66#define GUEST_NIO_PORT		0x488	/* guest upcalls via i/o port */
67
68#define	VMEXIT_SWITCH		0	/* force vcpu switch in mux mode */
69#define	VMEXIT_CONTINUE		1	/* continue from next instruction */
70#define	VMEXIT_RESTART		2	/* restart current instruction */
71#define	VMEXIT_ABORT		3	/* abort the vm run loop */
72#define	VMEXIT_RESET		4	/* guest machine has reset */
73
74#define MB		(1024UL * 1024)
75#define GB		(1024UL * MB)
76
77typedef int (*vmexit_handler_t)(struct vmctx *, struct vm_exit *, int *vcpu);
78
79int guest_tslice = DEFAULT_GUEST_TSLICE;
80int guest_hz = DEFAULT_GUEST_HZ;
81char *vmname;
82
83u_long lomem_sz;
84u_long himem_sz;
85
86int guest_ncpus;
87
88static int pincpu = -1;
89static int guest_vcpu_mux;
90static int guest_vmexit_on_hlt, guest_vmexit_on_pause, disable_x2apic;
91
92static int foundcpus;
93
94static int strictio;
95
96static int acpi;
97
98static char *lomem_addr;
99static char *himem_addr;
100
101static char *progname;
102static const int BSP = 0;
103
104static int cpumask;
105
106static void vm_loop(struct vmctx *ctx, int vcpu, uint64_t rip);
107
108struct vm_exit vmexit[VM_MAXCPU];
109
110struct fbsdstats {
111        uint64_t        vmexit_bogus;
112        uint64_t        vmexit_bogus_switch;
113        uint64_t        vmexit_hlt;
114        uint64_t        vmexit_pause;
115        uint64_t        vmexit_mtrap;
116        uint64_t        vmexit_paging;
117        uint64_t        cpu_switch_rotate;
118        uint64_t        cpu_switch_direct;
119        int             io_reset;
120} stats;
121
122struct mt_vmm_info {
123	pthread_t	mt_thr;
124	struct vmctx	*mt_ctx;
125	int		mt_vcpu;
126} mt_vmm_info[VM_MAXCPU];
127
128static void
129usage(int code)
130{
131
132        fprintf(stderr,
133                "Usage: %s [-aehABHIP][-g <gdb port>][-z <hz>][-s <pci>]"
134		"[-S <pci>][-p pincpu][-n <pci>][-m lowmem][-M highmem]"
135		" <vmname>\n"
136		"       -a: local apic is in XAPIC mode (default is X2APIC)\n"
137		"       -A: create an ACPI table\n"
138		"       -g: gdb port (default is %d and 0 means don't open)\n"
139		"       -c: # cpus (default 1)\n"
140		"       -p: pin vcpu 'n' to host cpu 'pincpu + n'\n"
141		"       -B: inject breakpoint exception on vm entry\n"
142		"       -H: vmexit from the guest on hlt\n"
143		"       -I: present an ioapic to the guest\n"
144		"       -P: vmexit from the guest on pause\n"
145		"	-e: exit on unhandled i/o access\n"
146		"       -h: help\n"
147		"       -z: guest hz (default is %d)\n"
148		"       -s: <slot,driver,configinfo> PCI slot config\n"
149		"       -S: <slot,driver,configinfo> legacy PCI slot config\n"
150		"       -m: lowmem in MB\n"
151		"       -M: highmem in MB\n"
152		"       -x: mux vcpus to 1 hcpu\n"
153		"       -t: mux vcpu timeslice hz (default %d)\n",
154		progname, DEFAULT_GDB_PORT, DEFAULT_GUEST_HZ,
155		DEFAULT_GUEST_TSLICE);
156	exit(code);
157}
158
159void *
160paddr_guest2host(uintptr_t gaddr)
161{
162	if (lomem_sz == 0)
163		return (NULL);
164
165	if (gaddr < lomem_sz) {
166		return ((void *)(lomem_addr + gaddr));
167	} else if (gaddr >= 4*GB && gaddr < (4*GB + himem_sz)) {
168		return ((void *)(himem_addr + gaddr - 4*GB));
169	} else
170		return (NULL);
171}
172
173int
174fbsdrun_disable_x2apic(void)
175{
176
177	return (disable_x2apic);
178}
179
180int
181fbsdrun_vmexit_on_pause(void)
182{
183
184	return (guest_vmexit_on_pause);
185}
186
187int
188fbsdrun_vmexit_on_hlt(void)
189{
190
191	return (guest_vmexit_on_hlt);
192}
193
194int
195fbsdrun_muxed(void)
196{
197
198	return (guest_vcpu_mux);
199}
200
201static void *
202fbsdrun_start_thread(void *param)
203{
204	char tname[MAXCOMLEN + 1];
205	struct mt_vmm_info *mtp;
206	int vcpu;
207
208	mtp = param;
209	vcpu = mtp->mt_vcpu;
210
211	snprintf(tname, sizeof(tname), "%s vcpu %d", vmname, vcpu);
212	pthread_set_name_np(mtp->mt_thr, tname);
213
214	vm_loop(mtp->mt_ctx, vcpu, vmexit[vcpu].rip);
215
216	/* not reached */
217	exit(1);
218	return (NULL);
219}
220
221void
222fbsdrun_addcpu(struct vmctx *ctx, int vcpu, uint64_t rip)
223{
224	int error;
225
226	if (cpumask & (1 << vcpu)) {
227		fprintf(stderr, "addcpu: attempting to add existing cpu %d\n",
228		    vcpu);
229		exit(1);
230	}
231
232	cpumask |= 1 << vcpu;
233	foundcpus++;
234
235	/*
236	 * Set up the vmexit struct to allow execution to start
237	 * at the given RIP
238	 */
239	vmexit[vcpu].rip = rip;
240	vmexit[vcpu].inst_length = 0;
241
242	if (vcpu == BSP || !guest_vcpu_mux){
243		mt_vmm_info[vcpu].mt_ctx = ctx;
244		mt_vmm_info[vcpu].mt_vcpu = vcpu;
245
246		error = pthread_create(&mt_vmm_info[vcpu].mt_thr, NULL,
247				fbsdrun_start_thread, &mt_vmm_info[vcpu]);
248		assert(error == 0);
249	}
250}
251
252static int
253fbsdrun_get_next_cpu(int curcpu)
254{
255
256	/*
257	 * Get the next available CPU. Assumes they arrive
258	 * in ascending order with no gaps.
259	 */
260	return ((curcpu + 1) % foundcpus);
261}
262
263static int
264vmexit_catch_reset(void)
265{
266        stats.io_reset++;
267        return (VMEXIT_RESET);
268}
269
270static int
271vmexit_catch_inout(void)
272{
273	return (VMEXIT_ABORT);
274}
275
276static int
277vmexit_handle_notify(struct vmctx *ctx, struct vm_exit *vme, int *pvcpu,
278		     uint32_t eax)
279{
280#if PG_DEBUG /* put all types of debug here */
281        if (eax == 0) {
282		pause_noswitch = 1;
283	} else if (eax == 1) {
284		pause_noswitch = 0;
285	} else {
286		pause_noswitch = 0;
287		if (eax == 5) {
288			vm_set_capability(ctx, *pvcpu, VM_CAP_MTRAP_EXIT, 1);
289		}
290	}
291#endif
292        return (VMEXIT_CONTINUE);
293}
294
295static int
296vmexit_inout(struct vmctx *ctx, struct vm_exit *vme, int *pvcpu)
297{
298	int error;
299	int bytes, port, in, out;
300	uint32_t eax;
301	int vcpu;
302
303	vcpu = *pvcpu;
304
305	port = vme->u.inout.port;
306	bytes = vme->u.inout.bytes;
307	eax = vme->u.inout.eax;
308	in = vme->u.inout.in;
309	out = !in;
310
311	/* We don't deal with these */
312	if (vme->u.inout.string || vme->u.inout.rep)
313		return (VMEXIT_ABORT);
314
315	/* Special case of guest reset */
316	if (out && port == 0x64 && (uint8_t)eax == 0xFE)
317		return (vmexit_catch_reset());
318
319        /* Extra-special case of host notifications */
320        if (out && port == GUEST_NIO_PORT)
321                return (vmexit_handle_notify(ctx, vme, pvcpu, eax));
322
323	error = emulate_inout(ctx, vcpu, in, port, bytes, &eax, strictio);
324	if (error == 0 && in)
325		error = vm_set_register(ctx, vcpu, VM_REG_GUEST_RAX, eax);
326
327	if (error == 0)
328		return (VMEXIT_CONTINUE);
329	else {
330		fprintf(stderr, "Unhandled %s%c 0x%04x\n",
331			in ? "in" : "out",
332			bytes == 1 ? 'b' : (bytes == 2 ? 'w' : 'l'), port);
333		return (vmexit_catch_inout());
334	}
335}
336
337static int
338vmexit_rdmsr(struct vmctx *ctx, struct vm_exit *vme, int *pvcpu)
339{
340	fprintf(stderr, "vm exit rdmsr 0x%x, cpu %d\n", vme->u.msr.code,
341	    *pvcpu);
342	return (VMEXIT_ABORT);
343}
344
345static int
346vmexit_wrmsr(struct vmctx *ctx, struct vm_exit *vme, int *pvcpu)
347{
348	int newcpu;
349	int retval = VMEXIT_CONTINUE;
350
351	newcpu = emulate_wrmsr(ctx, *pvcpu, vme->u.msr.code,vme->u.msr.wval);
352
353	if (guest_vcpu_mux && *pvcpu != newcpu) {
354                retval = VMEXIT_SWITCH;
355                *pvcpu = newcpu;
356        }
357
358        return (retval);
359}
360
361static int
362vmexit_spinup_ap(struct vmctx *ctx, struct vm_exit *vme, int *pvcpu)
363{
364	int newcpu;
365	int retval = VMEXIT_CONTINUE;
366
367	newcpu = spinup_ap(ctx, *pvcpu,
368			   vme->u.spinup_ap.vcpu, vme->u.spinup_ap.rip);
369
370	if (guest_vcpu_mux && *pvcpu != newcpu) {
371		retval = VMEXIT_SWITCH;
372		*pvcpu = newcpu;
373	}
374
375	return (retval);
376}
377
378static int
379vmexit_vmx(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu)
380{
381
382	fprintf(stderr, "vm exit[%d]\n", *pvcpu);
383	fprintf(stderr, "\treason\t\tVMX\n");
384	fprintf(stderr, "\trip\t\t0x%016lx\n", vmexit->rip);
385	fprintf(stderr, "\tinst_length\t%d\n", vmexit->inst_length);
386	fprintf(stderr, "\terror\t\t%d\n", vmexit->u.vmx.error);
387	fprintf(stderr, "\texit_reason\t%u\n", vmexit->u.vmx.exit_reason);
388	fprintf(stderr, "\tqualification\t0x%016lx\n",
389	    vmexit->u.vmx.exit_qualification);
390
391	return (VMEXIT_ABORT);
392}
393
394static int bogus_noswitch = 1;
395
396static int
397vmexit_bogus(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu)
398{
399	stats.vmexit_bogus++;
400
401	if (!guest_vcpu_mux || guest_ncpus == 1 || bogus_noswitch) {
402		return (VMEXIT_RESTART);
403	} else {
404		stats.vmexit_bogus_switch++;
405		vmexit->inst_length = 0;
406		*pvcpu = -1;
407		return (VMEXIT_SWITCH);
408	}
409}
410
411static int
412vmexit_hlt(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu)
413{
414	stats.vmexit_hlt++;
415	if (fbsdrun_muxed()) {
416		*pvcpu = -1;
417		return (VMEXIT_SWITCH);
418	} else {
419		/*
420		 * Just continue execution with the next instruction. We use
421		 * the HLT VM exit as a way to be friendly with the host
422		 * scheduler.
423		 */
424		return (VMEXIT_CONTINUE);
425	}
426}
427
428static int pause_noswitch;
429
430static int
431vmexit_pause(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu)
432{
433	stats.vmexit_pause++;
434
435	if (fbsdrun_muxed() && !pause_noswitch) {
436		*pvcpu = -1;
437		return (VMEXIT_SWITCH);
438        } else {
439		return (VMEXIT_CONTINUE);
440	}
441}
442
443static int
444vmexit_mtrap(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu)
445{
446	stats.vmexit_mtrap++;
447
448	return (VMEXIT_RESTART);
449}
450
451static int
452vmexit_paging(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu)
453{
454	int err;
455	stats.vmexit_paging++;
456
457	err = emulate_mem(ctx, *pvcpu, vmexit->u.paging.gpa,
458			  &vmexit->u.paging.vie);
459
460	if (err) {
461		if (err == EINVAL) {
462			fprintf(stderr,
463			    "Failed to emulate instruction at 0x%lx\n",
464			    vmexit->rip);
465		} else if (err == ESRCH) {
466			fprintf(stderr, "Unhandled memory access to 0x%lx\n",
467			    vmexit->u.paging.gpa);
468		}
469
470		return (VMEXIT_ABORT);
471	}
472
473	return (VMEXIT_CONTINUE);
474}
475
476static void
477sigalrm(int sig)
478{
479	return;
480}
481
482static void
483setup_timeslice(void)
484{
485	struct sigaction sa;
486	struct itimerval itv;
487	int error;
488
489	/*
490	 * Setup a realtime timer to generate a SIGALRM at a
491	 * frequency of 'guest_tslice' ticks per second.
492	 */
493	sigemptyset(&sa.sa_mask);
494	sa.sa_flags = 0;
495	sa.sa_handler = sigalrm;
496
497	error = sigaction(SIGALRM, &sa, NULL);
498	assert(error == 0);
499
500	itv.it_interval.tv_sec = 0;
501	itv.it_interval.tv_usec = 1000000 / guest_tslice;
502	itv.it_value.tv_sec = 0;
503	itv.it_value.tv_usec = 1000000 / guest_tslice;
504
505	error = setitimer(ITIMER_REAL, &itv, NULL);
506	assert(error == 0);
507}
508
509static vmexit_handler_t handler[VM_EXITCODE_MAX] = {
510	[VM_EXITCODE_INOUT]  = vmexit_inout,
511	[VM_EXITCODE_VMX]    = vmexit_vmx,
512	[VM_EXITCODE_BOGUS]  = vmexit_bogus,
513	[VM_EXITCODE_RDMSR]  = vmexit_rdmsr,
514	[VM_EXITCODE_WRMSR]  = vmexit_wrmsr,
515	[VM_EXITCODE_MTRAP]  = vmexit_mtrap,
516	[VM_EXITCODE_PAGING] = vmexit_paging,
517	[VM_EXITCODE_SPINUP_AP] = vmexit_spinup_ap,
518};
519
520static void
521vm_loop(struct vmctx *ctx, int vcpu, uint64_t rip)
522{
523	cpuset_t mask;
524	int error, rc, prevcpu;
525
526	if (guest_vcpu_mux)
527		setup_timeslice();
528
529	if (pincpu >= 0) {
530		CPU_ZERO(&mask);
531		CPU_SET(pincpu + vcpu, &mask);
532		error = pthread_setaffinity_np(pthread_self(),
533					       sizeof(mask), &mask);
534		assert(error == 0);
535	}
536
537	while (1) {
538		error = vm_run(ctx, vcpu, rip, &vmexit[vcpu]);
539		if (error != 0) {
540			/*
541			 * It is possible that 'vmmctl' or some other process
542			 * has transitioned the vcpu to CANNOT_RUN state right
543			 * before we tried to transition it to RUNNING.
544			 *
545			 * This is expected to be temporary so just retry.
546			 */
547			if (errno == EBUSY)
548				continue;
549			else
550				break;
551		}
552
553		prevcpu = vcpu;
554                rc = (*handler[vmexit[vcpu].exitcode])(ctx, &vmexit[vcpu],
555                                                       &vcpu);
556		switch (rc) {
557                case VMEXIT_SWITCH:
558			assert(guest_vcpu_mux);
559			if (vcpu == -1) {
560				stats.cpu_switch_rotate++;
561				vcpu = fbsdrun_get_next_cpu(prevcpu);
562			} else {
563				stats.cpu_switch_direct++;
564			}
565			/* fall through */
566		case VMEXIT_CONTINUE:
567                        rip = vmexit[vcpu].rip + vmexit[vcpu].inst_length;
568			break;
569		case VMEXIT_RESTART:
570                        rip = vmexit[vcpu].rip;
571			break;
572		case VMEXIT_RESET:
573			exit(0);
574		default:
575			exit(1);
576		}
577	}
578	fprintf(stderr, "vm_run error %d, errno %d\n", error, errno);
579}
580
581static int
582num_vcpus_allowed(struct vmctx *ctx)
583{
584	int tmp, error;
585
586	error = vm_get_capability(ctx, BSP, VM_CAP_UNRESTRICTED_GUEST, &tmp);
587
588	/*
589	 * The guest is allowed to spinup more than one processor only if the
590	 * UNRESTRICTED_GUEST capability is available.
591	 */
592	if (error == 0)
593		return (VM_MAXCPU);
594	else
595		return (1);
596}
597
598int
599main(int argc, char *argv[])
600{
601	int c, error, gdb_port, inject_bkpt, tmp, err, ioapic, bvmcons;
602	int max_vcpus;
603	struct vmctx *ctx;
604	uint64_t rip;
605
606	bvmcons = 0;
607	inject_bkpt = 0;
608	progname = basename(argv[0]);
609	gdb_port = DEFAULT_GDB_PORT;
610	guest_ncpus = 1;
611	ioapic = 0;
612
613	while ((c = getopt(argc, argv, "abehABHIPxp:g:c:z:s:S:n:m:M:")) != -1) {
614		switch (c) {
615		case 'a':
616			disable_x2apic = 1;
617			break;
618		case 'A':
619			acpi = 1;
620			break;
621		case 'b':
622			bvmcons = 1;
623			break;
624		case 'B':
625			inject_bkpt = 1;
626			break;
627		case 'x':
628			guest_vcpu_mux = 1;
629			break;
630		case 'p':
631			pincpu = atoi(optarg);
632			break;
633                case 'c':
634			guest_ncpus = atoi(optarg);
635			break;
636		case 'g':
637			gdb_port = atoi(optarg);
638			break;
639		case 'z':
640			guest_hz = atoi(optarg);
641			break;
642		case 't':
643			guest_tslice = atoi(optarg);
644			break;
645		case 's':
646			pci_parse_slot(optarg, 0);
647			break;
648		case 'S':
649			pci_parse_slot(optarg, 1);
650			break;
651                case 'm':
652			lomem_sz = strtoul(optarg, NULL, 0) * MB;
653			break;
654                case 'M':
655			himem_sz = strtoul(optarg, NULL, 0) * MB;
656			break;
657		case 'H':
658			guest_vmexit_on_hlt = 1;
659			break;
660		case 'I':
661			ioapic = 1;
662			break;
663		case 'P':
664			guest_vmexit_on_pause = 1;
665			break;
666		case 'e':
667			strictio = 1;
668			break;
669		case 'h':
670			usage(0);
671		default:
672			usage(1);
673		}
674	}
675	argc -= optind;
676	argv += optind;
677
678	if (argc != 1)
679		usage(1);
680
681	/* No need to mux if guest is uni-processor */
682	if (guest_ncpus <= 1)
683		guest_vcpu_mux = 0;
684
685	/* vmexit on hlt if guest is muxed */
686	if (guest_vcpu_mux) {
687		guest_vmexit_on_hlt = 1;
688		guest_vmexit_on_pause = 1;
689	}
690
691	vmname = argv[0];
692
693	ctx = vm_open(vmname);
694	if (ctx == NULL) {
695		perror("vm_open");
696		exit(1);
697	}
698
699	max_vcpus = num_vcpus_allowed(ctx);
700	if (guest_ncpus > max_vcpus) {
701		fprintf(stderr, "%d vCPUs requested but only %d available\n",
702			guest_ncpus, max_vcpus);
703		exit(1);
704	}
705
706	if (fbsdrun_vmexit_on_hlt()) {
707		err = vm_get_capability(ctx, BSP, VM_CAP_HALT_EXIT, &tmp);
708		if (err < 0) {
709			fprintf(stderr, "VM exit on HLT not supported\n");
710			exit(1);
711		}
712		vm_set_capability(ctx, BSP, VM_CAP_HALT_EXIT, 1);
713		handler[VM_EXITCODE_HLT] = vmexit_hlt;
714	}
715
716        if (fbsdrun_vmexit_on_pause()) {
717		/*
718		 * pause exit support required for this mode
719		 */
720		err = vm_get_capability(ctx, BSP, VM_CAP_PAUSE_EXIT, &tmp);
721		if (err < 0) {
722			fprintf(stderr,
723			    "SMP mux requested, no pause support\n");
724			exit(1);
725		}
726		vm_set_capability(ctx, BSP, VM_CAP_PAUSE_EXIT, 1);
727		handler[VM_EXITCODE_PAUSE] = vmexit_pause;
728        }
729
730	if (fbsdrun_disable_x2apic())
731		err = vm_set_x2apic_state(ctx, BSP, X2APIC_DISABLED);
732	else
733		err = vm_set_x2apic_state(ctx, BSP, X2APIC_ENABLED);
734
735	if (err) {
736		fprintf(stderr, "Unable to set x2apic state (%d)\n", err);
737		exit(1);
738	}
739
740	if (lomem_sz != 0) {
741		lomem_addr = vm_map_memory(ctx, 0, lomem_sz);
742		if (lomem_addr == (char *) MAP_FAILED) {
743			lomem_sz = 0;
744		} else if (himem_sz != 0) {
745			himem_addr = vm_map_memory(ctx, 4*GB, himem_sz);
746			if (himem_addr == (char *) MAP_FAILED) {
747				lomem_sz = 0;
748				himem_sz = 0;
749			}
750		}
751	}
752
753	init_inout();
754	init_pci(ctx);
755	if (ioapic)
756		ioapic_init(0);
757
758	if (gdb_port != 0)
759		init_dbgport(gdb_port);
760
761	if (bvmcons)
762		init_bvmcons();
763
764	error = vm_get_register(ctx, BSP, VM_REG_GUEST_RIP, &rip);
765	assert(error == 0);
766
767	if (inject_bkpt) {
768		error = vm_inject_event(ctx, BSP, VM_HW_EXCEPTION, IDT_BP);
769		assert(error == 0);
770	}
771
772	/*
773	 * build the guest tables, MP etc.
774	 */
775	mptable_build(ctx, guest_ncpus, ioapic);
776
777	if (acpi) {
778		error = acpi_build(ctx, guest_ncpus, ioapic);
779		assert(error == 0);
780	}
781
782	/*
783	 * Add CPU 0
784	 */
785	fbsdrun_addcpu(ctx, BSP, rip);
786
787	/*
788	 * Head off to the main event dispatch loop
789	 */
790	mevent_dispatch();
791
792	exit(1);
793}
794