xref: /netbsd-src/sys/rump/librump/rumpkern/rump.c (revision a5847cc334d9a7029f6352b847e9e8d71a0f9e0c) 
1 /*	$NetBSD: rump.c,v 1.234 2011/03/22 15:16:23 pooka Exp $	*/
2 
3 /*
4  * Copyright (c) 2007-2011 Antti Kantee.  All Rights Reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  */
27 
28 #include <sys/cdefs.h>
29 __KERNEL_RCSID(0, "$NetBSD: rump.c,v 1.234 2011/03/22 15:16:23 pooka Exp $");
30 
31 #include <sys/systm.h>
32 #define ELFSIZE ARCH_ELFSIZE
33 
34 #include <sys/param.h>
35 #include <sys/atomic.h>
36 #include <sys/buf.h>
37 #include <sys/callout.h>
38 #include <sys/conf.h>
39 #include <sys/cpu.h>
40 #include <sys/device.h>
41 #include <sys/evcnt.h>
42 #include <sys/event.h>
43 #include <sys/exec_elf.h>
44 #include <sys/filedesc.h>
45 #include <sys/iostat.h>
46 #include <sys/kauth.h>
47 #include <sys/kernel.h>
48 #include <sys/kmem.h>
49 #include <sys/kprintf.h>
50 #include <sys/kthread.h>
51 #include <sys/ksyms.h>
52 #include <sys/msgbuf.h>
53 #include <sys/module.h>
54 #include <sys/namei.h>
55 #include <sys/once.h>
56 #include <sys/percpu.h>
57 #include <sys/pipe.h>
58 #include <sys/pool.h>
59 #include <sys/queue.h>
60 #include <sys/reboot.h>
61 #include <sys/resourcevar.h>
62 #include <sys/select.h>
63 #include <sys/sysctl.h>
64 #include <sys/syscall.h>
65 #include <sys/syscallvar.h>
66 #include <sys/timetc.h>
67 #include <sys/tty.h>
68 #include <sys/uidinfo.h>
69 #include <sys/vmem.h>
70 #include <sys/xcall.h>
71 #include <sys/simplelock.h>
72 
73 #include <rump/rumpuser.h>
74 
75 #include <secmodel/suser/suser.h>
76 
77 #include <prop/proplib.h>
78 
79 #include <uvm/uvm_extern.h>
80 #include <uvm/uvm_readahead.h>
81 
82 #include "rump_private.h"
83 #include "rump_net_private.h"
84 #include "rump_vfs_private.h"
85 #include "rump_dev_private.h"
86 
87 char machine[] = MACHINE;
88 
89 struct proc *initproc;
90 
91 struct device rump_rootdev = {
92 	.dv_class = DV_VIRTUAL
93 };
94 
95 #ifdef RUMP_WITHOUT_THREADS
96 int rump_threads = 0;
97 #else
98 int rump_threads = 1;
99 #endif
100 
101 static int rump_proxy_syscall(int, void *, register_t *);
102 static int rump_proxy_rfork(void *, int, const char *);
103 static void rump_proxy_lwpexit(void);
104 static void rump_proxy_execnotify(const char *);
105 
106 static char rump_msgbuf[16*1024]; /* 16k should be enough for std rump needs */
107 
108 #ifdef LOCKDEBUG
109 const int rump_lockdebug = 1;
110 #else
111 const int rump_lockdebug = 0;
112 #endif
113 bool rump_ttycomponent = false;
114 
115 static void
116 rump_aiodone_worker(struct work *wk, void *dummy)
117 {
118 	struct buf *bp = (struct buf *)wk;
119 
120 	KASSERT(&bp->b_work == wk);
121 	bp->b_iodone(bp);
122 }
123 
124 static int rump_inited;
125 
126 /*
127  * Make sure pnbuf_cache is available even without vfs
128  */
129 int rump_initpnbufpool(void);
130 int rump_initpnbufpool(void)
131 {
132 
133         pnbuf_cache = pool_cache_init(MAXPATHLEN, 0, 0, 0, "pnbufpl",
134 	    NULL, IPL_NONE, NULL, NULL, NULL);
135 	return EOPNOTSUPP;
136 }
137 
138 int rump__unavailable(void);
139 int rump__unavailable() {return EOPNOTSUPP;}
140 __weak_alias(rump_net_init,rump__unavailable);
141 __weak_alias(rump_vfs_init,rump_initpnbufpool);
142 __weak_alias(rump_dev_init,rump__unavailable);
143 
144 __weak_alias(rump_vfs_fini,rump__unavailable);
145 
146 __weak_alias(biodone,rump__unavailable);
147 __weak_alias(sopoll,rump__unavailable);
148 
149 __weak_alias(rump_vfs_drainbufs,rump__unavailable);
150 
151 void rump__unavailable_vfs_panic(void);
152 void rump__unavailable_vfs_panic() {panic("vfs component not available");}
153 __weak_alias(usermount_common_policy,rump__unavailable_vfs_panic);
154 
155 /* easier to write vfs-less clients */
156 __weak_alias(rump_pub_etfs_register,rump__unavailable);
157 __weak_alias(rump_pub_etfs_register_withsize,rump__unavailable);
158 __weak_alias(rump_pub_etfs_remove,rump__unavailable);
159 
160 rump_proc_vfs_init_fn rump_proc_vfs_init;
161 rump_proc_vfs_release_fn rump_proc_vfs_release;
162 
163 static void add_linkedin_modules(const struct modinfo *const *, size_t);
164 
165 static void __noinline
166 messthestack(void)
167 {
168 	volatile uint32_t mess[64];
169 	uint64_t d1, d2;
170 	int i, error;
171 
172 	for (i = 0; i < 64; i++) {
173 		rumpuser_gettime(&d1, &d2, &error);
174 		mess[i] = d2;
175 	}
176 }
177 
178 /*
179  * Create kern.hostname.  why only this you ask.  well, init_sysctl
180  * is a kitchen sink in need of some gardening.  but i want to use
181  * kern.hostname today.
182  */
183 static void
184 mksysctls(void)
185 {
186 
187 	sysctl_createv(NULL, 0, NULL, NULL,
188 	    CTLFLAG_PERMANENT, CTLTYPE_NODE, "kern", NULL,
189 	    NULL, 0, NULL, 0, CTL_KERN, CTL_EOL);
190 
191 	/* XXX: setting hostnamelen is missing */
192 	sysctl_createv(NULL, 0, NULL, NULL,
193 	    CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_STRING, "hostname",
194 	    SYSCTL_DESCR("System hostname"), NULL, 0,
195 	    &hostname, MAXHOSTNAMELEN, CTL_KERN, KERN_HOSTNAME, CTL_EOL);
196 }
197 
198 /* there's no convenient kernel entry point for this, so just craft out own */
199 static pid_t
200 spgetpid(void)
201 {
202 
203 	return curproc->p_pid;
204 }
205 
206 static const struct rumpuser_sp_ops spops = {
207 	.spop_schedule		= rump_schedule,
208 	.spop_unschedule	= rump_unschedule,
209 	.spop_lwproc_switch	= rump_lwproc_switch,
210 	.spop_lwproc_release	= rump_lwproc_releaselwp,
211 	.spop_lwproc_rfork	= rump_proxy_rfork,
212 	.spop_lwproc_newlwp	= rump_lwproc_newlwp,
213 	.spop_lwproc_curlwp	= rump_lwproc_curlwp,
214 	.spop_lwpexit		= rump_proxy_lwpexit,
215 	.spop_syscall		= rump_proxy_syscall,
216 	.spop_execnotify	= rump_proxy_execnotify,
217 	.spop_getpid		= spgetpid,
218 };
219 
220 int
221 rump_daemonize_begin(void)
222 {
223 
224 	if (rump_inited)
225 		return EALREADY;
226 
227 	return rumpuser_daemonize_begin();
228 }
229 
230 int
231 rump_daemonize_done(int error)
232 {
233 
234 	return rumpuser_daemonize_done(error);
235 }
236 
237 int
238 rump__init(int rump_version)
239 {
240 	char buf[256];
241 	struct timespec ts;
242 	uint64_t sec, nsec;
243 	struct lwp *l;
244 	int i, numcpu;
245 	int error;
246 
247 	/* not reentrant */
248 	if (rump_inited)
249 		return 0;
250 	else if (rump_inited == -1)
251 		panic("rump_init: host process restart required");
252 	else
253 		rump_inited = 1;
254 
255 	if (rumpuser_getversion() != RUMPUSER_VERSION) {
256 		/* let's hope the ABI of rumpuser_dprintf is the same ;) */
257 		rumpuser_dprintf("rumpuser version mismatch: %d vs. %d\n",
258 		    rumpuser_getversion(), RUMPUSER_VERSION);
259 		return EPROGMISMATCH;
260 	}
261 
262 	if (rumpuser_getenv("RUMP_VERBOSE", buf, sizeof(buf), &error) == 0) {
263 		if (*buf != '0')
264 			boothowto = AB_VERBOSE;
265 	}
266 
267 	if (rumpuser_getenv("RUMP_NCPU", buf, sizeof(buf), &error) == 0)
268 		error = 0;
269 	if (error == 0) {
270 		numcpu = strtoll(buf, NULL, 10);
271 		if (numcpu < 1)
272 			numcpu = 1;
273 	} else {
274 		numcpu = rumpuser_getnhostcpu();
275 	}
276 	rump_cpus_bootstrap(&numcpu);
277 
278 	rumpuser_gettime(&sec, &nsec, &error);
279 	boottime.tv_sec = sec;
280 	boottime.tv_nsec = nsec;
281 
282 	initmsgbuf(rump_msgbuf, sizeof(rump_msgbuf));
283 	aprint_verbose("%s%s", copyright, version);
284 
285 	/*
286 	 * Seed arc4random() with a "reasonable" amount of randomness.
287 	 * Yes, this is a quick kludge which depends on the arc4random
288 	 * implementation.
289 	 */
290 	messthestack();
291 	arc4random();
292 
293 	if (rump_version != RUMP_VERSION) {
294 		printf("rump version mismatch, %d vs. %d\n",
295 		    rump_version, RUMP_VERSION);
296 		return EPROGMISMATCH;
297 	}
298 
299 	if (rumpuser_getenv("RUMP_THREADS", buf, sizeof(buf), &error) == 0) {
300 		rump_threads = *buf != '0';
301 	}
302 	rumpuser_thrinit(rump_user_schedule, rump_user_unschedule,
303 	    rump_threads);
304 	rump_intr_init(numcpu);
305 	rump_tsleep_init();
306 
307 	/* init minimal lwp/cpu context */
308 	l = &lwp0;
309 	l->l_lid = 1;
310 	l->l_cpu = l->l_target_cpu = rump_cpu;
311 	l->l_fd = &filedesc0;
312 	rumpuser_set_curlwp(l);
313 
314 	rumpuser_mutex_init(&rump_giantlock);
315 	ksyms_init();
316 	uvm_init();
317 	evcnt_init();
318 
319 	once_init();
320 	kernconfig_lock_init();
321 	prop_kern_init();
322 
323 	pool_subsystem_init();
324 	kmem_init();
325 
326 	uvm_ra_init();
327 	uao_init();
328 
329 	mutex_obj_init();
330 	callout_startup();
331 
332 	kprintf_init();
333 	loginit();
334 
335 	kauth_init();
336 
337 	procinit();
338 	proc0_init();
339 	uid_init();
340 	chgproccnt(0, 1);
341 
342 	l->l_proc = &proc0;
343 	lwp_update_creds(l);
344 
345 	lwpinit_specificdata();
346 	lwp_initspecific(&lwp0);
347 
348 	rump_scheduler_init(numcpu);
349 	/* revert temporary context and schedule a semireal context */
350 	rumpuser_set_curlwp(NULL);
351 	initproc = &proc0; /* borrow proc0 before we get initproc started */
352 	rump_schedule();
353 
354 	percpu_init();
355 	inittimecounter();
356 	ntp_init();
357 
358 	rumpuser_gettime(&sec, &nsec, &error);
359 	ts.tv_sec = sec;
360 	ts.tv_nsec = nsec;
361 	tc_setclock(&ts);
362 
363 	/* we are mostly go.  do per-cpu subsystem init */
364 	for (i = 0; i < numcpu; i++) {
365 		struct cpu_info *ci = cpu_lookup(i);
366 
367 		/* attach non-bootstrap CPUs */
368 		if (i > 0) {
369 			rump_cpu_attach(ci);
370 			ncpu++;
371 		}
372 
373 		callout_init_cpu(ci);
374 		softint_init(ci);
375 		xc_init_cpu(ci);
376 		pool_cache_cpu_init(ci);
377 		selsysinit(ci);
378 		percpu_init_cpu(ci);
379 
380 		TAILQ_INIT(&ci->ci_data.cpu_ld_locks);
381 		__cpu_simple_lock_init(&ci->ci_data.cpu_ld_lock);
382 
383 		aprint_verbose("cpu%d at thinair0: rump virtual cpu\n", i);
384 	}
385 
386 	sysctl_init();
387 	mksysctls();
388 	kqueue_init();
389 	iostat_init();
390 	fd_sys_init();
391 	module_init();
392 	devsw_init();
393 	pipe_init();
394 	resource_init();
395 	procinit_sysctl();
396 
397 	/* start page baroness */
398 	if (rump_threads) {
399 		if (kthread_create(PRI_PGDAEMON, KTHREAD_MPSAFE, NULL,
400 		    uvm_pageout, NULL, &uvm.pagedaemon_lwp, "pdaemon") != 0)
401 			panic("pagedaemon create failed");
402 	} else
403 		uvm.pagedaemon_lwp = NULL; /* doesn't match curlwp */
404 
405 	/* process dso's */
406 	rumpuser_dl_bootstrap(add_linkedin_modules, rump_kernelfsym_load);
407 
408 	rump_component_init(RUMP_COMPONENT_KERN);
409 
410 	/* these do nothing if not present */
411 	rump_vfs_init();
412 	rump_net_init();
413 	rump_dev_init();
414 
415 	rump_component_init(RUMP_COMPONENT_KERN_VFS);
416 
417 	/*
418 	 * if we initialized the tty component above, the tyttymtx is
419 	 * now initialized.  otherwise, we need to initialize it.
420 	 */
421 	if (!rump_ttycomponent)
422 		mutex_init(&tty_lock, MUTEX_DEFAULT, IPL_VM);
423 
424 	cold = 0;
425 
426 	/* aieeeedondest */
427 	if (rump_threads) {
428 		if (workqueue_create(&uvm.aiodone_queue, "aiodoned",
429 		    rump_aiodone_worker, NULL, 0, 0, WQ_MPSAFE))
430 			panic("aiodoned");
431 	}
432 
433 	sysctl_finalize();
434 
435 	module_init_class(MODULE_CLASS_ANY);
436 
437 	rumpuser_gethostname(hostname, MAXHOSTNAMELEN, &error);
438 	hostnamelen = strlen(hostname);
439 
440 	sigemptyset(&sigcantmask);
441 
442 	if (rump_threads)
443 		vmem_rehash_start();
444 
445 	/*
446 	 * Create init, used to attach implicit threads in rump.
447 	 * (note: must be done after vfsinit to get cwdi)
448 	 */
449 	(void)rump__lwproc_alloclwp(NULL); /* dummy thread for initproc */
450 	mutex_enter(proc_lock);
451 	initproc = proc_find_raw(1);
452 	mutex_exit(proc_lock);
453 	if (initproc == NULL)
454 		panic("where in the world is initproc?");
455 
456 	/*
457 	 * Adjust syscall vector in case factions were dlopen()'d
458 	 * before calling rump_init().
459 	 * (modules will handle dynamic syscalls the usual way)
460 	 *
461 	 * Note: this will adjust the function vectors of
462 	 * syscalls which use a funcalias (getpid etc.), but
463 	 * it makes no difference.
464 	 */
465 	for (i = 0; i < SYS_NSYSENT; i++) {
466 		void *sym;
467 
468 		if (rump_sysent[i].sy_flags & SYCALL_NOSYS ||
469 		    *syscallnames[i] == '#' ||
470 		    rump_sysent[i].sy_call == sys_nomodule)
471 			continue;
472 
473 		/*
474 		 * deal with compat wrappers.  makesyscalls.sh should
475 		 * generate the necessary info instead of this hack,
476 		 * though.  ugly, fix it later.
477 		 */
478 #define CPFX "compat_"
479 #define CPFXLEN (sizeof(CPFX)-1)
480 		if (strncmp(syscallnames[i], CPFX, CPFXLEN) == 0) {
481 			const char *p = syscallnames[i] + CPFXLEN;
482 			size_t namelen;
483 
484 			/* skip version number */
485 			while (*p >= '0' && *p <= '9')
486 				p++;
487 			if (p == syscallnames[i] + CPFXLEN || *p != '_')
488 				panic("invalid syscall name %s\n",
489 				    syscallnames[i]);
490 
491 			/* skip over the next underscore */
492 			p++;
493 			namelen = p + (sizeof("rumpns_")-1) - syscallnames[i];
494 
495 			strcpy(buf, "rumpns_");
496 			strcat(buf, syscallnames[i]);
497 			/* XXX: no strncat in the kernel */
498 			strcpy(buf+namelen, "sys_");
499 			strcat(buf, p);
500 #undef CPFX
501 #undef CPFXLEN
502 		} else {
503 			sprintf(buf, "rumpns_sys_%s", syscallnames[i]);
504 		}
505 		if ((sym = rumpuser_dl_globalsym(buf)) != NULL
506 		    && sym != rump_sysent[i].sy_call) {
507 #if 0
508 			rumpuser_dprintf("adjusting %s: %p (old %p)\n",
509 			    syscallnames[i], sym, rump_sysent[i].sy_call);
510 #endif
511 			rump_sysent[i].sy_call = sym;
512 		}
513 	}
514 
515 	/* release cpu */
516 	rump_unschedule();
517 
518 	return 0;
519 }
520 
521 int
522 rump_init_server(const char *url)
523 {
524 
525 	return rumpuser_sp_init(url, &spops, ostype, osrelease, MACHINE);
526 }
527 
528 void
529 cpu_reboot(int howto, char *bootstr)
530 {
531 	int ruhow = 0;
532 	void *finiarg;
533 
534 	printf("rump kernel halting...\n");
535 
536 	if (!RUMP_LOCALPROC_P(curproc))
537 		finiarg = curproc->p_vmspace->vm_map.pmap;
538 	else
539 		finiarg = NULL;
540 
541 	/* dump means we really take the dive here */
542 	if ((howto & RB_DUMP) || panicstr) {
543 		ruhow = RUMPUSER_PANIC;
544 		goto out;
545 	}
546 
547 	/* try to sync */
548 	if (!((howto & RB_NOSYNC) || panicstr)) {
549 		rump_vfs_fini();
550 	}
551 
552 	/* your wish is my command */
553 	if (howto & RB_HALT) {
554 		printf("rump kernel halted\n");
555 		rumpuser_sp_fini(finiarg);
556 		for (;;) {
557 			uint64_t sec = 5, nsec = 0;
558 			int error;
559 
560 			rumpuser_nanosleep(&sec, &nsec, &error);
561 		}
562 	}
563 
564 	/* this function is __dead, we must exit */
565  out:
566 	printf("halted\n");
567 	rumpuser_sp_fini(finiarg);
568 	rumpuser_exit(ruhow);
569 }
570 
571 struct uio *
572 rump_uio_setup(void *buf, size_t bufsize, off_t offset, enum rump_uiorw rw)
573 {
574 	struct uio *uio;
575 	enum uio_rw uiorw;
576 
577 	switch (rw) {
578 	case RUMPUIO_READ:
579 		uiorw = UIO_READ;
580 		break;
581 	case RUMPUIO_WRITE:
582 		uiorw = UIO_WRITE;
583 		break;
584 	default:
585 		panic("%s: invalid rw %d", __func__, rw);
586 	}
587 
588 	uio = kmem_alloc(sizeof(struct uio), KM_SLEEP);
589 	uio->uio_iov = kmem_alloc(sizeof(struct iovec), KM_SLEEP);
590 
591 	uio->uio_iov->iov_base = buf;
592 	uio->uio_iov->iov_len = bufsize;
593 
594 	uio->uio_iovcnt = 1;
595 	uio->uio_offset = offset;
596 	uio->uio_resid = bufsize;
597 	uio->uio_rw = uiorw;
598 	UIO_SETUP_SYSSPACE(uio);
599 
600 	return uio;
601 }
602 
603 size_t
604 rump_uio_getresid(struct uio *uio)
605 {
606 
607 	return uio->uio_resid;
608 }
609 
610 off_t
611 rump_uio_getoff(struct uio *uio)
612 {
613 
614 	return uio->uio_offset;
615 }
616 
617 size_t
618 rump_uio_free(struct uio *uio)
619 {
620 	size_t resid;
621 
622 	resid = uio->uio_resid;
623 	kmem_free(uio->uio_iov, sizeof(*uio->uio_iov));
624 	kmem_free(uio, sizeof(*uio));
625 
626 	return resid;
627 }
628 
629 kauth_cred_t
630 rump_cred_create(uid_t uid, gid_t gid, size_t ngroups, gid_t *groups)
631 {
632 	kauth_cred_t cred;
633 	int rv;
634 
635 	cred = kauth_cred_alloc();
636 	kauth_cred_setuid(cred, uid);
637 	kauth_cred_seteuid(cred, uid);
638 	kauth_cred_setsvuid(cred, uid);
639 	kauth_cred_setgid(cred, gid);
640 	kauth_cred_setgid(cred, gid);
641 	kauth_cred_setegid(cred, gid);
642 	kauth_cred_setsvgid(cred, gid);
643 	rv = kauth_cred_setgroups(cred, groups, ngroups, 0, UIO_SYSSPACE);
644 	/* oh this is silly.  and by "this" I mean kauth_cred_setgroups() */
645 	assert(rv == 0);
646 
647 	return cred;
648 }
649 
650 void
651 rump_cred_put(kauth_cred_t cred)
652 {
653 
654 	kauth_cred_free(cred);
655 }
656 
657 static int compcounter[RUMP_COMPONENT_MAX];
658 
659 static void
660 rump_component_init_cb(struct rump_component *rc, int type)
661 {
662 
663 	KASSERT(type < RUMP_COMPONENT_MAX);
664 	if (rc->rc_type == type) {
665 		rc->rc_init();
666 		compcounter[type]++;
667 	}
668 }
669 
670 int
671 rump_component_count(enum rump_component_type type)
672 {
673 
674 	KASSERT(type <= RUMP_COMPONENT_MAX);
675 	return compcounter[type];
676 }
677 
678 void
679 rump_component_init(enum rump_component_type type)
680 {
681 
682 	rumpuser_dl_component_init(type, rump_component_init_cb);
683 }
684 
685 /*
686  * Initialize a module which has already been loaded and linked
687  * with dlopen(). This is fundamentally the same as a builtin module.
688  */
689 int
690 rump_module_init(const struct modinfo * const *mip, size_t nmodinfo)
691 {
692 
693 	return module_builtin_add(mip, nmodinfo, true);
694 }
695 
696 /*
697  * Finish module (flawless victory, fatality!).
698  */
699 int
700 rump_module_fini(const struct modinfo *mi)
701 {
702 
703 	return module_builtin_remove(mi, true);
704 }
705 
706 /*
707  * Add loaded and linked module to the builtin list.  It will
708  * later be initialized with module_init_class().
709  */
710 
711 static void
712 add_linkedin_modules(const struct modinfo * const *mip, size_t nmodinfo)
713 {
714 
715 	module_builtin_add(mip, nmodinfo, false);
716 }
717 
718 int
719 rump_kernelfsym_load(void *symtab, uint64_t symsize,
720 	char *strtab, uint64_t strsize)
721 {
722 	static int inited = 0;
723 	Elf64_Ehdr ehdr;
724 
725 	if (inited)
726 		return EBUSY;
727 	inited = 1;
728 
729 	/*
730 	 * Use 64bit header since it's bigger.  Shouldn't make a
731 	 * difference, since we're passing in all zeroes anyway.
732 	 */
733 	memset(&ehdr, 0, sizeof(ehdr));
734 	ksyms_addsyms_explicit(&ehdr, symtab, symsize, strtab, strsize);
735 
736 	return 0;
737 }
738 
739 static int
740 rump_proxy_syscall(int num, void *arg, register_t *retval)
741 {
742 	struct lwp *l;
743 	struct sysent *callp;
744 	int rv;
745 
746 	if (__predict_false(num >= SYS_NSYSENT))
747 		return ENOSYS;
748 
749 	callp = rump_sysent + num;
750 	l = curlwp;
751 	rv = sy_call(callp, l, (void *)arg, retval);
752 
753 	return rv;
754 }
755 
756 static int
757 rump_proxy_rfork(void *priv, int flags, const char *comm)
758 {
759 	struct vmspace *newspace;
760 	struct proc *p;
761 	int error;
762 
763 	if ((error = rump_lwproc_rfork(flags)) != 0)
764 		return error;
765 
766 	/*
767 	 * Since it's a proxy proc, adjust the vmspace.
768 	 * Refcount will eternally be 1.
769 	 */
770 	p = curproc;
771 	newspace = kmem_zalloc(sizeof(*newspace), KM_SLEEP);
772 	newspace->vm_refcnt = 1;
773 	newspace->vm_map.pmap = priv;
774 	KASSERT(p->p_vmspace == vmspace_kernel());
775 	p->p_vmspace = newspace;
776 	if (comm)
777 		strlcpy(p->p_comm, comm, sizeof(p->p_comm));
778 
779 	return 0;
780 }
781 
782 /*
783  * Order all lwps in a process to exit.  does *not* wait for them to drain.
784  */
785 static void
786 rump_proxy_lwpexit(void)
787 {
788 	struct proc *p = curproc;
789 	uint64_t where;
790 	struct lwp *l;
791 
792 	mutex_enter(p->p_lock);
793 	/*
794 	 * First pass: mark all lwps in the process with LW_RUMP_QEXIT
795 	 * so that they know they should exit.
796 	 */
797 	LIST_FOREACH(l, &p->p_lwps, l_sibling) {
798 		if (l == curlwp)
799 			continue;
800 		l->l_flag |= LW_RUMP_QEXIT;
801 	}
802 	mutex_exit(p->p_lock);
803 
804 	/*
805 	 * Next, make sure everyone on all CPUs sees our status
806 	 * update.  This keeps threads inside cv_wait() and makes
807 	 * sure we don't access a stale cv pointer later when
808 	 * we wake up the threads.
809 	 */
810 
811 	where = xc_broadcast(0, (xcfunc_t)nullop, NULL, NULL);
812 	xc_wait(where);
813 
814 	/*
815 	 * Ok, all lwps are either:
816 	 *  1) not in the cv code
817 	 *  2) sleeping on l->l_private
818 	 *  3) sleeping on p->p_waitcv
819 	 *
820 	 * Either way, l_private is stable until we set PS_RUMP_LWPEXIT
821 	 * in p->p_sflag.
822 	 */
823 
824 	mutex_enter(p->p_lock);
825 	LIST_FOREACH(l, &p->p_lwps, l_sibling) {
826 		if (l->l_private)
827 			cv_broadcast(l->l_private);
828 	}
829 	p->p_sflag |= PS_RUMP_LWPEXIT;
830 	cv_broadcast(&p->p_waitcv);
831 	mutex_exit(p->p_lock);
832 }
833 
834 /*
835  * Notify process that all threads have been drained and exec is complete.
836  */
837 static void
838 rump_proxy_execnotify(const char *comm)
839 {
840 	struct proc *p = curproc;
841 
842 	fd_closeexec();
843 	mutex_enter(p->p_lock);
844 	KASSERT(p->p_nlwps == 1 && p->p_sflag & PS_RUMP_LWPEXIT);
845 	p->p_sflag &= ~PS_RUMP_LWPEXIT;
846 	mutex_exit(p->p_lock);
847 	strlcpy(p->p_comm, comm, sizeof(p->p_comm));
848 }
849 
850 int
851 rump_boot_gethowto()
852 {
853 
854 	return boothowto;
855 }
856 
857 void
858 rump_boot_sethowto(int howto)
859 {
860 
861 	boothowto = howto;
862 }
863 
864 int
865 rump_getversion(void)
866 {
867 
868 	return __NetBSD_Version__;
869 }
870 
871 /*
872  * Note: may be called unscheduled.  Not fully safe since no locking
873  * of allevents (currently that's not even available).
874  */
875 void
876 rump_printevcnts()
877 {
878 	struct evcnt *ev;
879 
880 	TAILQ_FOREACH(ev, &allevents, ev_list)
881 		rumpuser_dprintf("%s / %s: %" PRIu64 "\n",
882 		    ev->ev_group, ev->ev_name, ev->ev_count);
883 }
884 
885 /*
886  * If you use this interface ... well ... all bets are off.
887  * The original purpose is for the p2k fs server library to be
888  * able to use the same pid/lid for VOPs as the host kernel.
889  */
890 void
891 rump_allbetsareoff_setid(pid_t pid, int lid)
892 {
893 	struct lwp *l = curlwp;
894 	struct proc *p = l->l_proc;
895 
896 	l->l_lid = lid;
897 	p->p_pid = pid;
898 }
899