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rump.c revision 1.192 
      1 /*	$NetBSD: rump.c,v 1.192 2010/10/28 11:30:07 pooka Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2007 Antti Kantee.  All Rights Reserved.
      5  *
      6  * Development of this software was supported by Google Summer of Code.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     18  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     20  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     23  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     27  * SUCH DAMAGE.
     28  */
     29 
     30 #include <sys/cdefs.h>
     31 __KERNEL_RCSID(0, "$NetBSD: rump.c,v 1.192 2010/10/28 11:30:07 pooka Exp $");
     32 
     33 #include <sys/systm.h>
     34 #define ELFSIZE ARCH_ELFSIZE
     35 
     36 #include <sys/param.h>
     37 #include <sys/atomic.h>
     38 #include <sys/buf.h>
     39 #include <sys/callout.h>
     40 #include <sys/conf.h>
     41 #include <sys/cpu.h>
     42 #include <sys/device.h>
     43 #include <sys/evcnt.h>
     44 #include <sys/event.h>
     45 #include <sys/exec_elf.h>
     46 #include <sys/filedesc.h>
     47 #include <sys/iostat.h>
     48 #include <sys/kauth.h>
     49 #include <sys/kernel.h>
     50 #include <sys/kmem.h>
     51 #include <sys/kprintf.h>
     52 #include <sys/kthread.h>
     53 #include <sys/ksyms.h>
     54 #include <sys/msgbuf.h>
     55 #include <sys/module.h>
     56 #include <sys/once.h>
     57 #include <sys/percpu.h>
     58 #include <sys/pipe.h>
     59 #include <sys/pool.h>
     60 #include <sys/queue.h>
     61 #include <sys/reboot.h>
     62 #include <sys/resourcevar.h>
     63 #include <sys/select.h>
     64 #include <sys/sysctl.h>
     65 #include <sys/syscall.h>
     66 #include <sys/syscallvar.h>
     67 #include <sys/timetc.h>
     68 #include <sys/tty.h>
     69 #include <sys/uidinfo.h>
     70 #include <sys/vmem.h>
     71 #include <sys/xcall.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 /* pretend the master rump proc is init */
     90 struct proc *initproc = &proc0;
     91 
     92 struct rumpuser_mtx *rump_giantlock;
     93 
     94 struct device rump_rootdev = {
     95 	.dv_class = DV_VIRTUAL
     96 };
     97 
     98 #ifdef RUMP_WITHOUT_THREADS
     99 int rump_threads = 0;
    100 #else
    101 int rump_threads = 1;
    102 #endif
    103 
    104 /*
    105  * System call proxying support.  These deserve another look later,
    106  * but good enough for now.
    107  */
    108 static struct vmspace sp_vmspace;
    109 static int rumpsp_type;
    110 
    111 static char rump_msgbuf[16*1024]; /* 16k should be enough for std rump needs */
    112 
    113 static void
    114 rump_aiodone_worker(struct work *wk, void *dummy)
    115 {
    116 	struct buf *bp = (struct buf *)wk;
    117 
    118 	KASSERT(&bp->b_work == wk);
    119 	bp->b_iodone(bp);
    120 }
    121 
    122 static int rump_inited;
    123 
    124 /*
    125  * Make sure pnbuf_cache is available even without vfs
    126  */
    127 struct pool_cache *pnbuf_cache;
    128 int rump_initpnbufpool(void);
    129 int rump_initpnbufpool(void)
    130 {
    131 
    132         pnbuf_cache = pool_cache_init(MAXPATHLEN, 0, 0, 0, "pnbufpl",
    133 	    NULL, IPL_NONE, NULL, NULL, NULL);
    134 	return EOPNOTSUPP;
    135 }
    136 
    137 int rump__unavailable(void);
    138 int rump__unavailable() {return EOPNOTSUPP;}
    139 __weak_alias(rump_net_init,rump__unavailable);
    140 __weak_alias(rump_vfs_init,rump_initpnbufpool);
    141 __weak_alias(rump_dev_init,rump__unavailable);
    142 
    143 __weak_alias(rump_vfs_fini,rump__unavailable);
    144 
    145 __weak_alias(biodone,rump__unavailable);
    146 __weak_alias(sopoll,rump__unavailable);
    147 
    148 __weak_alias(rump_vfs_drainbufs,rump__unavailable);
    149 
    150 void rump__unavailable_vfs_panic(void);
    151 void rump__unavailable_vfs_panic() {panic("vfs component not available");}
    152 __weak_alias(usermount_common_policy,rump__unavailable_vfs_panic);
    153 
    154 rump_proc_vfs_init_fn rump_proc_vfs_init;
    155 rump_proc_vfs_release_fn rump_proc_vfs_release;
    156 
    157 static void add_linkedin_modules(const struct modinfo *const *, size_t);
    158 
    159 static void __noinline
    160 messthestack(void)
    161 {
    162 	volatile uint32_t mess[64];
    163 	uint64_t d1, d2;
    164 	int i, error;
    165 
    166 	for (i = 0; i < 64; i++) {
    167 		rumpuser_gettime(&d1, &d2, &error);
    168 		mess[i] = d2;
    169 	}
    170 }
    171 
    172 /*
    173  * Create kern.hostname.  why only this you ask.  well, init_sysctl
    174  * is a kitchen sink in need of some gardening.  but i want to use
    175  * kern.hostname today.
    176  */
    177 static void
    178 mksysctls(void)
    179 {
    180 
    181 	sysctl_createv(NULL, 0, NULL, NULL,
    182 	    CTLFLAG_PERMANENT, CTLTYPE_NODE, "kern", NULL,
    183 	    NULL, 0, NULL, 0, CTL_KERN, CTL_EOL);
    184 
    185 	/* XXX: setting hostnamelen is missing */
    186 	sysctl_createv(NULL, 0, NULL, NULL,
    187 	    CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_STRING, "hostname",
    188 	    SYSCTL_DESCR("System hostname"), NULL, 0,
    189 	    &hostname, MAXHOSTNAMELEN, CTL_KERN, KERN_HOSTNAME, CTL_EOL);
    190 }
    191 
    192 int
    193 rump__init(int rump_version)
    194 {
    195 	char buf[256];
    196 	struct timespec ts;
    197 	uint64_t sec, nsec;
    198 	struct lwp *l;
    199 	int i, numcpu;
    200 	int error;
    201 
    202 	/* not reentrant */
    203 	if (rump_inited)
    204 		return 0;
    205 	else if (rump_inited == -1)
    206 		panic("rump_init: host process restart required");
    207 	else
    208 		rump_inited = 1;
    209 
    210 	/* Check our role as a rump proxy */
    211 	if ((error = rumpuser_sp_init(&rumpsp_type)) != 0)
    212 		return error;
    213 
    214 	/* If we're a client, we can return directly.  Otherwise, proceed. */
    215 	switch (rumpsp_type) {
    216 	case RUMP_SP_CLIENT:
    217 		return 0;
    218 	case RUMP_SP_SERVER:
    219 	case RUMP_SP_NONE:
    220 		break;
    221 	}
    222 
    223 	if (rumpuser_getversion() != RUMPUSER_VERSION) {
    224 		/* let's hope the ABI of rumpuser_dprintf is the same ;) */
    225 		rumpuser_dprintf("rumpuser version mismatch: %d vs. %d\n",
    226 		    rumpuser_getversion(), RUMPUSER_VERSION);
    227 		return EPROGMISMATCH;
    228 	}
    229 
    230 	if (rumpuser_getenv("RUMP_VERBOSE", buf, sizeof(buf), &error) == 0) {
    231 		if (*buf != '0')
    232 			boothowto = AB_VERBOSE;
    233 	}
    234 
    235 	if (rumpuser_getenv("RUMP_NCPU", buf, sizeof(buf), &error) == 0)
    236 		error = 0;
    237 	/* non-x86 is missing CPU_INFO_FOREACH() support */
    238 #if defined(__i386__) || defined(__x86_64__)
    239 	if (error == 0) {
    240 		numcpu = strtoll(buf, NULL, 10);
    241 		if (numcpu < 1)
    242 			numcpu = 1;
    243 	} else {
    244 		numcpu = rumpuser_getnhostcpu();
    245 	}
    246 #else
    247 	if (error == 0)
    248 		printf("NCPU limited to 1 on this machine architecture\n");
    249 	numcpu = 1;
    250 #endif
    251 	rump_cpus_bootstrap(numcpu);
    252 
    253 	rumpuser_gettime(&sec, &nsec, &error);
    254 	boottime.tv_sec = sec;
    255 	boottime.tv_nsec = nsec;
    256 
    257 	initmsgbuf(rump_msgbuf, sizeof(rump_msgbuf));
    258 	aprint_verbose("%s%s", copyright, version);
    259 
    260 	/*
    261 	 * Seed arc4random() with a "reasonable" amount of randomness.
    262 	 * Yes, this is a quick kludge which depends on the arc4random
    263 	 * implementation.
    264 	 */
    265 	messthestack();
    266 	arc4random();
    267 
    268 	if (rump_version != RUMP_VERSION) {
    269 		printf("rump version mismatch, %d vs. %d\n",
    270 		    rump_version, RUMP_VERSION);
    271 		return EPROGMISMATCH;
    272 	}
    273 
    274 	if (rumpuser_getenv("RUMP_THREADS", buf, sizeof(buf), &error) == 0) {
    275 		rump_threads = *buf != '0';
    276 	}
    277 	rumpuser_thrinit(rump_user_schedule, rump_user_unschedule,
    278 	    rump_threads);
    279 	rump_intr_init(numcpu);
    280 	rump_tsleep_init();
    281 
    282 	/* init minimal lwp/cpu context */
    283 	l = &lwp0;
    284 	l->l_lid = 1;
    285 	l->l_cpu = l->l_target_cpu = rump_cpu;
    286 	l->l_fd = &filedesc0;
    287 	rumpuser_set_curlwp(l);
    288 
    289 	mutex_init(&tty_lock, MUTEX_DEFAULT, IPL_NONE);
    290 	rumpuser_mutex_recursive_init(&rump_giantlock);
    291 	ksyms_init();
    292 	uvm_init();
    293 	evcnt_init();
    294 
    295 	once_init();
    296 	kernconfig_lock_init();
    297 	prop_kern_init();
    298 
    299 	pool_subsystem_init();
    300 	kmem_init();
    301 
    302 	uvm_ra_init();
    303 	uao_init();
    304 
    305 	mutex_obj_init();
    306 	callout_startup();
    307 
    308 	kprintf_init();
    309 	loginit();
    310 
    311 	kauth_init();
    312 
    313 	procinit();
    314 	proc0_init();
    315 	uid_init();
    316 	chgproccnt(0, 1);
    317 
    318 	l->l_proc = &proc0;
    319 	lwp_update_creds(l);
    320 
    321 	lwpinit_specificdata();
    322 	lwp_initspecific(&lwp0);
    323 
    324 	rump_scheduler_init(numcpu);
    325 	/* revert temporary context and schedule a real context */
    326 	l->l_cpu = NULL;
    327 	rumpuser_set_curlwp(NULL);
    328 	rump_schedule();
    329 
    330 	percpu_init();
    331 	inittimecounter();
    332 	ntp_init();
    333 
    334 	rumpuser_gettime(&sec, &nsec, &error);
    335 	ts.tv_sec = sec;
    336 	ts.tv_nsec = nsec;
    337 	tc_setclock(&ts);
    338 
    339 	/* we are mostly go.  do per-cpu subsystem init */
    340 	for (i = 0; i < numcpu; i++) {
    341 		struct cpu_info *ci = cpu_lookup(i);
    342 
    343 		/* attach non-bootstrap CPUs */
    344 		if (i > 0) {
    345 			rump_cpu_attach(ci);
    346 			ncpu++;
    347 		}
    348 
    349 		callout_init_cpu(ci);
    350 		softint_init(ci);
    351 		xc_init_cpu(ci);
    352 		pool_cache_cpu_init(ci);
    353 		selsysinit(ci);
    354 		percpu_init_cpu(ci);
    355 
    356 		aprint_verbose("cpu%d at thinair0: rump virtual cpu\n", i);
    357 	}
    358 
    359 	sysctl_init();
    360 	mksysctls();
    361 	kqueue_init();
    362 	iostat_init();
    363 	fd_sys_init();
    364 	module_init();
    365 	devsw_init();
    366 	pipe_init();
    367 	resource_init();
    368 
    369 	/* start page baroness */
    370 	if (rump_threads) {
    371 		if (kthread_create(PRI_PGDAEMON, KTHREAD_MPSAFE, NULL,
    372 		    uvm_pageout, NULL, &uvm.pagedaemon_lwp, "pdaemon") != 0)
    373 			panic("pagedaemon create failed");
    374 	} else
    375 		uvm.pagedaemon_lwp = NULL; /* doesn't match curlwp */
    376 
    377 	/* process dso's */
    378 	rumpuser_dl_bootstrap(add_linkedin_modules, rump_kernelfsym_load);
    379 
    380 	rump_component_init(RUMP_COMPONENT_KERN);
    381 
    382 	/* these do nothing if not present */
    383 	rump_vfs_init();
    384 	rump_net_init();
    385 	rump_dev_init();
    386 
    387 	rump_component_init(RUMP_COMPONENT_KERN_VFS);
    388 
    389 	cold = 0;
    390 
    391 	/* aieeeedondest */
    392 	if (rump_threads) {
    393 		if (workqueue_create(&uvm.aiodone_queue, "aiodoned",
    394 		    rump_aiodone_worker, NULL, 0, 0, WQ_MPSAFE))
    395 			panic("aiodoned");
    396 	}
    397 
    398 	sysctl_finalize();
    399 
    400 	module_init_class(MODULE_CLASS_ANY);
    401 
    402 	rumpuser_gethostname(hostname, MAXHOSTNAMELEN, &error);
    403 	hostnamelen = strlen(hostname);
    404 
    405 	sigemptyset(&sigcantmask);
    406 
    407 	if (rump_threads)
    408 		vmem_rehash_start();
    409 
    410 	rump_unschedule();
    411 
    412 	return 0;
    413 }
    414 
    415 /* maybe support sys_reboot some day for remote shutdown */
    416 void
    417 rump_reboot(int howto)
    418 {
    419 
    420 	/* dump means we really take the dive here */
    421 	if ((howto & RB_DUMP) || panicstr) {
    422 		rumpuser_exit(RUMPUSER_PANIC);
    423 		/*NOTREACHED*/
    424 	}
    425 
    426 	/* try to sync */
    427 	if (!((howto & RB_NOSYNC) || panicstr)) {
    428 		rump_vfs_fini();
    429 	}
    430 
    431 	/* your wish is my command */
    432 	if (howto & RB_HALT) {
    433 		for (;;) {
    434 			uint64_t sec = 5, nsec = 0;
    435 			int error;
    436 
    437 			rumpuser_nanosleep(&sec, &nsec, &error);
    438 		}
    439 	}
    440 	rump_inited = -1;
    441 }
    442 
    443 struct uio *
    444 rump_uio_setup(void *buf, size_t bufsize, off_t offset, enum rump_uiorw rw)
    445 {
    446 	struct uio *uio;
    447 	enum uio_rw uiorw;
    448 
    449 	switch (rw) {
    450 	case RUMPUIO_READ:
    451 		uiorw = UIO_READ;
    452 		break;
    453 	case RUMPUIO_WRITE:
    454 		uiorw = UIO_WRITE;
    455 		break;
    456 	default:
    457 		panic("%s: invalid rw %d", __func__, rw);
    458 	}
    459 
    460 	uio = kmem_alloc(sizeof(struct uio), KM_SLEEP);
    461 	uio->uio_iov = kmem_alloc(sizeof(struct iovec), KM_SLEEP);
    462 
    463 	uio->uio_iov->iov_base = buf;
    464 	uio->uio_iov->iov_len = bufsize;
    465 
    466 	uio->uio_iovcnt = 1;
    467 	uio->uio_offset = offset;
    468 	uio->uio_resid = bufsize;
    469 	uio->uio_rw = uiorw;
    470 	uio->uio_vmspace = UIO_VMSPACE_SYS;
    471 
    472 	return uio;
    473 }
    474 
    475 size_t
    476 rump_uio_getresid(struct uio *uio)
    477 {
    478 
    479 	return uio->uio_resid;
    480 }
    481 
    482 off_t
    483 rump_uio_getoff(struct uio *uio)
    484 {
    485 
    486 	return uio->uio_offset;
    487 }
    488 
    489 size_t
    490 rump_uio_free(struct uio *uio)
    491 {
    492 	size_t resid;
    493 
    494 	resid = uio->uio_resid;
    495 	kmem_free(uio->uio_iov, sizeof(*uio->uio_iov));
    496 	kmem_free(uio, sizeof(*uio));
    497 
    498 	return resid;
    499 }
    500 
    501 /* rump private.  NEEDS WORK! */
    502 void
    503 rump_set_vmspace(struct vmspace *vm)
    504 {
    505 	struct proc *p = curproc;
    506 
    507 	p->p_vmspace = vm;
    508 }
    509 
    510 kauth_cred_t
    511 rump_cred_create(uid_t uid, gid_t gid, size_t ngroups, gid_t *groups)
    512 {
    513 	kauth_cred_t cred;
    514 	int rv;
    515 
    516 	cred = kauth_cred_alloc();
    517 	kauth_cred_setuid(cred, uid);
    518 	kauth_cred_seteuid(cred, uid);
    519 	kauth_cred_setsvuid(cred, uid);
    520 	kauth_cred_setgid(cred, gid);
    521 	kauth_cred_setgid(cred, gid);
    522 	kauth_cred_setegid(cred, gid);
    523 	kauth_cred_setsvgid(cred, gid);
    524 	rv = kauth_cred_setgroups(cred, groups, ngroups, 0, UIO_SYSSPACE);
    525 	/* oh this is silly.  and by "this" I mean kauth_cred_setgroups() */
    526 	assert(rv == 0);
    527 
    528 	return cred;
    529 }
    530 
    531 void
    532 rump_cred_put(kauth_cred_t cred)
    533 {
    534 
    535 	kauth_cred_free(cred);
    536 }
    537 
    538 static int compcounter[RUMP_COMPONENT_MAX];
    539 
    540 static void
    541 rump_component_init_cb(struct rump_component *rc, int type)
    542 {
    543 
    544 	KASSERT(type < RUMP_COMPONENT_MAX);
    545 	if (rc->rc_type == type) {
    546 		rc->rc_init();
    547 		compcounter[type]++;
    548 	}
    549 }
    550 
    551 int
    552 rump_component_count(enum rump_component_type type)
    553 {
    554 
    555 	KASSERT(type <= RUMP_COMPONENT_MAX);
    556 	return compcounter[type];
    557 }
    558 
    559 void
    560 rump_component_init(enum rump_component_type type)
    561 {
    562 
    563 	rumpuser_dl_component_init(type, rump_component_init_cb);
    564 }
    565 
    566 /*
    567  * Initialize a module which has already been loaded and linked
    568  * with dlopen(). This is fundamentally the same as a builtin module.
    569  */
    570 int
    571 rump_module_init(const struct modinfo * const *mip, size_t nmodinfo)
    572 {
    573 
    574 	return module_builtin_add(mip, nmodinfo, true);
    575 }
    576 
    577 /*
    578  * Finish module (flawless victory, fatality!).
    579  */
    580 int
    581 rump_module_fini(const struct modinfo *mi)
    582 {
    583 
    584 	return module_builtin_remove(mi, true);
    585 }
    586 
    587 /*
    588  * Add loaded and linked module to the builtin list.  It will
    589  * later be initialized with module_init_class().
    590  */
    591 
    592 static void
    593 add_linkedin_modules(const struct modinfo * const *mip, size_t nmodinfo)
    594 {
    595 
    596 	module_builtin_add(mip, nmodinfo, false);
    597 }
    598 
    599 int
    600 rump_kernelfsym_load(void *symtab, uint64_t symsize,
    601 	char *strtab, uint64_t strsize)
    602 {
    603 	static int inited = 0;
    604 	Elf64_Ehdr ehdr;
    605 
    606 	if (inited)
    607 		return EBUSY;
    608 	inited = 1;
    609 
    610 	/*
    611 	 * Use 64bit header since it's bigger.  Shouldn't make a
    612 	 * difference, since we're passing in all zeroes anyway.
    613 	 */
    614 	memset(&ehdr, 0, sizeof(ehdr));
    615 	ksyms_addsyms_explicit(&ehdr, symtab, symsize, strtab, strsize);
    616 
    617 	return 0;
    618 }
    619 
    620 void *rump_sysproxy_arg; /* XXX: nukeme */
    621 int
    622 rump_syscall(int num, void *arg, register_t *retval)
    623 {
    624 	struct lwp *l;
    625 	struct sysent *callp;
    626 	int rv;
    627 
    628 	if (__predict_false(num >= SYS_NSYSENT))
    629 		return ENOSYS;
    630 
    631 	callp = rump_sysent + num;
    632 	l = curlwp;
    633 	if (rumpsp_type == RUMP_SP_SERVER)
    634 		curproc->p_vmspace = &sp_vmspace;
    635 	rv = sy_call(callp, l, (void *)arg, retval);
    636 	if (rumpsp_type == RUMP_SP_SERVER)
    637 		curproc->p_vmspace = &vmspace0;
    638 
    639 	return rv;
    640 }
    641 
    642 int
    643 rump_sysproxy(int num, void *arg, uint8_t *data, size_t dlen,
    644 	register_t *retval)
    645 {
    646 	int rv;
    647 
    648 	if (rumpsp_type == RUMP_SP_CLIENT) {
    649 		rv = rumpuser_sp_syscall(num, data, dlen, retval);
    650 	} else {
    651 		rump_schedule();
    652 		rv = rump_syscall(num, data, retval);
    653 		rump_unschedule();
    654 	}
    655 
    656 	return rv;
    657 }
    658 
    659 int
    660 rump_boot_gethowto()
    661 {
    662 
    663 	return boothowto;
    664 }
    665 
    666 void
    667 rump_boot_sethowto(int howto)
    668 {
    669 
    670 	boothowto = howto;
    671 }
    672 
    673 int
    674 rump_getversion(void)
    675 {
    676 
    677 	return __NetBSD_Version__;
    678 }
    679 
    680 /*
    681  * Note: may be called unscheduled.  Not fully safe since no locking
    682  * of allevents (currently that's not even available).
    683  */
    684 void
    685 rump_printevcnts()
    686 {
    687 	struct evcnt *ev;
    688 
    689 	TAILQ_FOREACH(ev, &allevents, ev_list)
    690 		rumpuser_dprintf("%s / %s: %" PRIu64 "\n",
    691 		    ev->ev_group, ev->ev_name, ev->ev_count);
    692 }
    693 
    694 /*
    695  * If you use this interface ... well ... all bets are off.
    696  * The original purpose is for the p2k fs server library to be
    697  * able to use the same pid/lid for VOPs as the host kernel.
    698  */
    699 void
    700 rump_allbetsareoff_setid(pid_t pid, int lid)
    701 {
    702 	struct lwp *l = curlwp;
    703 	struct proc *p = l->l_proc;
    704 
    705 	l->l_lid = lid;
    706 	p->p_pid = pid;
    707 }
    708