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rump.c revision 1.188 
      1 /*	$NetBSD: rump.c,v 1.188 2010/09/07 21:11:10 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 1.188 2010/09/07 21:11:10 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 /* is this still necessary or use kern_proc stuff? */
     88 struct session rump_session = {
     89 	.s_count = 1,
     90 	.s_flags = 0,
     91 	.s_leader = &proc0,
     92 	.s_login = "rumphobo",
     93 	.s_sid = 0,
     94 };
     95 struct pgrp rump_pgrp = {
     96 	.pg_members = LIST_HEAD_INITIALIZER(pg_members),
     97 	.pg_session = &rump_session,
     98 	.pg_jobc = 1,
     99 };
    100 
    101 char machine[] = MACHINE;
    102 static kauth_cred_t rump_susercred;
    103 
    104 /* pretend the master rump proc is init */
    105 struct proc *initproc = &proc0;
    106 
    107 struct rumpuser_mtx *rump_giantlock;
    108 
    109 struct device rump_rootdev = {
    110 	.dv_class = DV_VIRTUAL
    111 };
    112 
    113 #ifdef RUMP_WITHOUT_THREADS
    114 int rump_threads = 0;
    115 #else
    116 int rump_threads = 1;
    117 #endif
    118 
    119 static char rump_msgbuf[16*1024]; /* 16k should be enough for std rump needs */
    120 
    121 static void
    122 rump_aiodone_worker(struct work *wk, void *dummy)
    123 {
    124 	struct buf *bp = (struct buf *)wk;
    125 
    126 	KASSERT(&bp->b_work == wk);
    127 	bp->b_iodone(bp);
    128 }
    129 
    130 static int rump_inited;
    131 
    132 /*
    133  * Make sure pnbuf_cache is available even without vfs
    134  */
    135 struct pool_cache *pnbuf_cache;
    136 int rump_initpnbufpool(void);
    137 int rump_initpnbufpool(void)
    138 {
    139 
    140         pnbuf_cache = pool_cache_init(MAXPATHLEN, 0, 0, 0, "pnbufpl",
    141 	    NULL, IPL_NONE, NULL, NULL, NULL);
    142 	return EOPNOTSUPP;
    143 }
    144 
    145 int rump__unavailable(void);
    146 int rump__unavailable() {return EOPNOTSUPP;}
    147 __weak_alias(rump_net_init,rump__unavailable);
    148 __weak_alias(rump_vfs_init,rump_initpnbufpool);
    149 __weak_alias(rump_dev_init,rump__unavailable);
    150 
    151 __weak_alias(rump_vfs_fini,rump__unavailable);
    152 
    153 __weak_alias(biodone,rump__unavailable);
    154 __weak_alias(sopoll,rump__unavailable);
    155 
    156 __weak_alias(rump_vfs_drainbufs,rump__unavailable);
    157 
    158 void rump__unavailable_vfs_panic(void);
    159 void rump__unavailable_vfs_panic() {panic("vfs component not available");}
    160 __weak_alias(usermount_common_policy,rump__unavailable_vfs_panic);
    161 
    162 rump_proc_vfs_init_fn rump_proc_vfs_init;
    163 rump_proc_vfs_release_fn rump_proc_vfs_release;
    164 
    165 static void add_linkedin_modules(const struct modinfo *const *, size_t);
    166 
    167 static void __noinline
    168 messthestack(void)
    169 {
    170 	volatile uint32_t mess[64];
    171 	uint64_t d1, d2;
    172 	int i, error;
    173 
    174 	for (i = 0; i < 64; i++) {
    175 		rumpuser_gettime(&d1, &d2, &error);
    176 		mess[i] = d2;
    177 	}
    178 }
    179 
    180 /*
    181  * Create kern.hostname.  why only this you ask.  well, init_sysctl
    182  * is a kitchen sink in need of some gardening.  but i want to use
    183  * kern.hostname today.
    184  */
    185 static void
    186 mksysctls(void)
    187 {
    188 
    189 	sysctl_createv(NULL, 0, NULL, NULL,
    190 	    CTLFLAG_PERMANENT, CTLTYPE_NODE, "kern", NULL,
    191 	    NULL, 0, NULL, 0, CTL_KERN, CTL_EOL);
    192 
    193 	/* XXX: setting hostnamelen is missing */
    194 	sysctl_createv(NULL, 0, NULL, NULL,
    195 	    CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_STRING, "hostname",
    196 	    SYSCTL_DESCR("System hostname"), NULL, 0,
    197 	    &hostname, MAXHOSTNAMELEN, CTL_KERN, KERN_HOSTNAME, CTL_EOL);
    198 }
    199 
    200 int
    201 rump__init(int rump_version)
    202 {
    203 	char buf[256];
    204 	struct timespec ts;
    205 	uint64_t sec, nsec;
    206 	struct lwp *l;
    207 	int i, numcpu;
    208 	int error;
    209 
    210 	/* not reentrant */
    211 	if (rump_inited)
    212 		return 0;
    213 	else if (rump_inited == -1)
    214 		panic("rump_init: host process restart required");
    215 	else
    216 		rump_inited = 1;
    217 
    218 	if (rumpuser_getversion() != RUMPUSER_VERSION) {
    219 		/* let's hope the ABI of rumpuser_dprintf is the same ;) */
    220 		rumpuser_dprintf("rumpuser version mismatch: %d vs. %d\n",
    221 		    rumpuser_getversion(), RUMPUSER_VERSION);
    222 		return EPROGMISMATCH;
    223 	}
    224 
    225 	if (rumpuser_getenv("RUMP_VERBOSE", buf, sizeof(buf), &error) == 0) {
    226 		if (*buf != '0')
    227 			boothowto = AB_VERBOSE;
    228 	}
    229 
    230 	if (rumpuser_getenv("RUMP_NCPU", buf, sizeof(buf), &error) == 0)
    231 		error = 0;
    232 	/* non-x86 is missing CPU_INFO_FOREACH() support */
    233 #if defined(__i386__) || defined(__x86_64__)
    234 	if (error == 0) {
    235 		numcpu = strtoll(buf, NULL, 10);
    236 		if (numcpu < 1)
    237 			numcpu = 1;
    238 	} else {
    239 		numcpu = rumpuser_getnhostcpu();
    240 	}
    241 #else
    242 	if (error == 0)
    243 		printf("NCPU limited to 1 on this host\n");
    244 	numcpu = 1;
    245 #endif
    246 	rump_cpus_bootstrap(numcpu);
    247 
    248 	rumpuser_gettime(&sec, &nsec, &error);
    249 	boottime.tv_sec = sec;
    250 	boottime.tv_nsec = nsec;
    251 
    252 	initmsgbuf(rump_msgbuf, sizeof(rump_msgbuf));
    253 	aprint_verbose("%s%s", copyright, version);
    254 
    255 	/*
    256 	 * Seed arc4random() with a "reasonable" amount of randomness.
    257 	 * Yes, this is a quick kludge which depends on the arc4random
    258 	 * implementation.
    259 	 */
    260 	messthestack();
    261 	arc4random();
    262 
    263 	if (rump_version != RUMP_VERSION) {
    264 		printf("rump version mismatch, %d vs. %d\n",
    265 		    rump_version, RUMP_VERSION);
    266 		return EPROGMISMATCH;
    267 	}
    268 
    269 	if (rumpuser_getenv("RUMP_THREADS", buf, sizeof(buf), &error) == 0) {
    270 		rump_threads = *buf != '0';
    271 	}
    272 	rumpuser_thrinit(rump_user_schedule, rump_user_unschedule,
    273 	    rump_threads);
    274 	rump_intr_init(numcpu);
    275 	rump_tsleep_init();
    276 
    277 	/* init minimal lwp/cpu context */
    278 	l = &lwp0;
    279 	l->l_lid = 1;
    280 	l->l_cpu = l->l_target_cpu = rump_cpu;
    281 	l->l_fd = &filedesc0;
    282 	rumpuser_set_curlwp(l);
    283 
    284 	mutex_init(&tty_lock, MUTEX_DEFAULT, IPL_NONE);
    285 	rumpuser_mutex_recursive_init(&rump_giantlock);
    286 	ksyms_init();
    287 	uvm_init();
    288 	evcnt_init();
    289 
    290 	once_init();
    291 	kernconfig_lock_init();
    292 	prop_kern_init();
    293 
    294 	pool_subsystem_init();
    295 	kmem_init();
    296 
    297 	uvm_ra_init();
    298 	uao_init();
    299 
    300 	mutex_obj_init();
    301 	callout_startup();
    302 
    303 	kprintf_init();
    304 	loginit();
    305 
    306 	kauth_init();
    307 	rump_susercred = rump_cred_create(0, 0, 0, NULL);
    308 
    309 	procinit();
    310 	proc0_init();
    311 
    312 	l->l_proc = &proc0;
    313 	lwp_update_creds(l);
    314 
    315 	lwpinit_specificdata();
    316 	lwp_initspecific(&lwp0);
    317 
    318 	rump_scheduler_init(numcpu);
    319 	/* revert temporary context and schedule a real context */
    320 	l->l_cpu = NULL;
    321 	rumpuser_set_curlwp(NULL);
    322 	rump_schedule();
    323 
    324 	percpu_init();
    325 	inittimecounter();
    326 	ntp_init();
    327 
    328 	rumpuser_gettime(&sec, &nsec, &error);
    329 	ts.tv_sec = sec;
    330 	ts.tv_nsec = nsec;
    331 	tc_setclock(&ts);
    332 
    333 	/* we are mostly go.  do per-cpu subsystem init */
    334 	for (i = 0; i < numcpu; i++) {
    335 		struct cpu_info *ci = cpu_lookup(i);
    336 
    337 		/* attach non-bootstrap CPUs */
    338 		if (i > 0) {
    339 			rump_cpu_attach(ci);
    340 			ncpu++;
    341 		}
    342 
    343 		callout_init_cpu(ci);
    344 		softint_init(ci);
    345 		xc_init_cpu(ci);
    346 		pool_cache_cpu_init(ci);
    347 		selsysinit(ci);
    348 		percpu_init_cpu(ci);
    349 
    350 		aprint_verbose("cpu%d at thinair0: rump virtual cpu\n", i);
    351 	}
    352 
    353 	sysctl_init();
    354 	kqueue_init();
    355 	iostat_init();
    356 	uid_init();
    357 	fd_sys_init();
    358 	module_init();
    359 	devsw_init();
    360 	pipe_init();
    361 	resource_init();
    362 
    363 	/* start page baroness */
    364 	if (rump_threads) {
    365 		if (kthread_create(PRI_PGDAEMON, KTHREAD_MPSAFE, NULL,
    366 		    uvm_pageout, NULL, &uvm.pagedaemon_lwp, "pdaemon") != 0)
    367 			panic("pagedaemon create failed");
    368 	} else
    369 		uvm.pagedaemon_lwp = NULL; /* doesn't match curlwp */
    370 
    371 	/* process dso's */
    372 	rumpuser_dl_bootstrap(add_linkedin_modules, rump_kernelfsym_load);
    373 
    374 	rump_component_init(RUMP_COMPONENT_KERN);
    375 
    376 	/* these do nothing if not present */
    377 	rump_vfs_init();
    378 	rump_net_init();
    379 	rump_dev_init();
    380 
    381 	rump_component_init(RUMP_COMPONENT_KERN_VFS);
    382 
    383 	cold = 0;
    384 
    385 	/* aieeeedondest */
    386 	if (rump_threads) {
    387 		if (workqueue_create(&uvm.aiodone_queue, "aiodoned",
    388 		    rump_aiodone_worker, NULL, 0, 0, WQ_MPSAFE))
    389 			panic("aiodoned");
    390 	}
    391 
    392 	mksysctls();
    393 	sysctl_finalize();
    394 
    395 	module_init_class(MODULE_CLASS_ANY);
    396 
    397 	rumpuser_gethostname(hostname, MAXHOSTNAMELEN, &error);
    398 	hostnamelen = strlen(hostname);
    399 
    400 	sigemptyset(&sigcantmask);
    401 
    402 	if (rump_threads)
    403 		vmem_rehash_start();
    404 
    405 	rump_unschedule();
    406 
    407 	return 0;
    408 }
    409 
    410 /* maybe support sys_reboot some day for remote shutdown */
    411 void
    412 rump_reboot(int howto)
    413 {
    414 
    415 	/* dump means we really take the dive here */
    416 	if ((howto & RB_DUMP) || panicstr) {
    417 		rumpuser_exit(RUMPUSER_PANIC);
    418 		/*NOTREACHED*/
    419 	}
    420 
    421 	/* try to sync */
    422 	if (!((howto & RB_NOSYNC) || panicstr)) {
    423 		rump_vfs_fini();
    424 	}
    425 
    426 	/* your wish is my command */
    427 	if (howto & RB_HALT) {
    428 		for (;;) {
    429 			uint64_t sec = 5, nsec = 0;
    430 			int error;
    431 
    432 			rumpuser_nanosleep(&sec, &nsec, &error);
    433 		}
    434 	}
    435 	rump_inited = -1;
    436 }
    437 
    438 struct uio *
    439 rump_uio_setup(void *buf, size_t bufsize, off_t offset, enum rump_uiorw rw)
    440 {
    441 	struct uio *uio;
    442 	enum uio_rw uiorw;
    443 
    444 	switch (rw) {
    445 	case RUMPUIO_READ:
    446 		uiorw = UIO_READ;
    447 		break;
    448 	case RUMPUIO_WRITE:
    449 		uiorw = UIO_WRITE;
    450 		break;
    451 	default:
    452 		panic("%s: invalid rw %d", __func__, rw);
    453 	}
    454 
    455 	uio = kmem_alloc(sizeof(struct uio), KM_SLEEP);
    456 	uio->uio_iov = kmem_alloc(sizeof(struct iovec), KM_SLEEP);
    457 
    458 	uio->uio_iov->iov_base = buf;
    459 	uio->uio_iov->iov_len = bufsize;
    460 
    461 	uio->uio_iovcnt = 1;
    462 	uio->uio_offset = offset;
    463 	uio->uio_resid = bufsize;
    464 	uio->uio_rw = uiorw;
    465 	uio->uio_vmspace = UIO_VMSPACE_SYS;
    466 
    467 	return uio;
    468 }
    469 
    470 size_t
    471 rump_uio_getresid(struct uio *uio)
    472 {
    473 
    474 	return uio->uio_resid;
    475 }
    476 
    477 off_t
    478 rump_uio_getoff(struct uio *uio)
    479 {
    480 
    481 	return uio->uio_offset;
    482 }
    483 
    484 size_t
    485 rump_uio_free(struct uio *uio)
    486 {
    487 	size_t resid;
    488 
    489 	resid = uio->uio_resid;
    490 	kmem_free(uio->uio_iov, sizeof(*uio->uio_iov));
    491 	kmem_free(uio, sizeof(*uio));
    492 
    493 	return resid;
    494 }
    495 
    496 /* rump private.  NEEDS WORK! */
    497 void
    498 rump_set_vmspace(struct vmspace *vm)
    499 {
    500 	struct proc *p = curproc;
    501 
    502 	p->p_vmspace = vm;
    503 }
    504 
    505 kauth_cred_t
    506 rump_cred_create(uid_t uid, gid_t gid, size_t ngroups, gid_t *groups)
    507 {
    508 	kauth_cred_t cred;
    509 	int rv;
    510 
    511 	cred = kauth_cred_alloc();
    512 	kauth_cred_setuid(cred, uid);
    513 	kauth_cred_seteuid(cred, uid);
    514 	kauth_cred_setsvuid(cred, uid);
    515 	kauth_cred_setgid(cred, gid);
    516 	kauth_cred_setgid(cred, gid);
    517 	kauth_cred_setegid(cred, gid);
    518 	kauth_cred_setsvgid(cred, gid);
    519 	rv = kauth_cred_setgroups(cred, groups, ngroups, 0, UIO_SYSSPACE);
    520 	/* oh this is silly.  and by "this" I mean kauth_cred_setgroups() */
    521 	assert(rv == 0);
    522 
    523 	return cred;
    524 }
    525 
    526 void
    527 rump_cred_put(kauth_cred_t cred)
    528 {
    529 
    530 	kauth_cred_free(cred);
    531 }
    532 
    533 static int compcounter[RUMP_COMPONENT_MAX];
    534 
    535 static void
    536 rump_component_init_cb(struct rump_component *rc, int type)
    537 {
    538 
    539 	KASSERT(type < RUMP_COMPONENT_MAX);
    540 	if (rc->rc_type == type) {
    541 		rc->rc_init();
    542 		compcounter[type]++;
    543 	}
    544 }
    545 
    546 int
    547 rump_component_count(enum rump_component_type type)
    548 {
    549 
    550 	KASSERT(type <= RUMP_COMPONENT_MAX);
    551 	return compcounter[type];
    552 }
    553 
    554 void
    555 rump_component_init(enum rump_component_type type)
    556 {
    557 
    558 	rumpuser_dl_component_init(type, rump_component_init_cb);
    559 }
    560 
    561 /*
    562  * Initialize a module which has already been loaded and linked
    563  * with dlopen(). This is fundamentally the same as a builtin module.
    564  */
    565 int
    566 rump_module_init(const struct modinfo * const *mip, size_t nmodinfo)
    567 {
    568 
    569 	return module_builtin_add(mip, nmodinfo, true);
    570 }
    571 
    572 /*
    573  * Finish module (flawless victory, fatality!).
    574  */
    575 int
    576 rump_module_fini(const struct modinfo *mi)
    577 {
    578 
    579 	return module_builtin_remove(mi, true);
    580 }
    581 
    582 /*
    583  * Add loaded and linked module to the builtin list.  It will
    584  * later be initialized with module_init_class().
    585  */
    586 
    587 static void
    588 add_linkedin_modules(const struct modinfo * const *mip, size_t nmodinfo)
    589 {
    590 
    591 	module_builtin_add(mip, nmodinfo, false);
    592 }
    593 
    594 int
    595 rump_kernelfsym_load(void *symtab, uint64_t symsize,
    596 	char *strtab, uint64_t strsize)
    597 {
    598 	static int inited = 0;
    599 	Elf64_Ehdr ehdr;
    600 
    601 	if (inited)
    602 		return EBUSY;
    603 	inited = 1;
    604 
    605 	/*
    606 	 * Use 64bit header since it's bigger.  Shouldn't make a
    607 	 * difference, since we're passing in all zeroes anyway.
    608 	 */
    609 	memset(&ehdr, 0, sizeof(ehdr));
    610 	ksyms_addsyms_explicit(&ehdr, symtab, symsize, strtab, strsize);
    611 
    612 	return 0;
    613 }
    614 
    615 static int
    616 rump_sysproxy_local(int num, void *arg, uint8_t *data, size_t dlen,
    617 	register_t *retval)
    618 {
    619 	struct lwp *l;
    620 	struct sysent *callp;
    621 	int rv;
    622 
    623 	if (__predict_false(num >= SYS_NSYSENT))
    624 		return ENOSYS;
    625 
    626 	callp = rump_sysent + num;
    627 	rump_schedule();
    628 	l = curlwp;
    629 	rv = sy_call(callp, l, (void *)data, retval);
    630 	rump_unschedule();
    631 
    632 	return rv;
    633 }
    634 
    635 int
    636 rump_boot_gethowto()
    637 {
    638 
    639 	return boothowto;
    640 }
    641 
    642 void
    643 rump_boot_sethowto(int howto)
    644 {
    645 
    646 	boothowto = howto;
    647 }
    648 
    649 rump_sysproxy_t rump_sysproxy = rump_sysproxy_local;
    650 void *rump_sysproxy_arg;
    651 
    652 /*
    653  * This whole syscall-via-rpc is still taking form.  For example, it
    654  * may be necessary to set syscalls individually instead of lobbing
    655  * them all to the same place.  So don't think this interface is
    656  * set in stone.
    657  */
    658 int
    659 rump_sysproxy_set(rump_sysproxy_t proxy, void *arg)
    660 {
    661 
    662 	if (rump_sysproxy_arg)
    663 		return EBUSY;
    664 
    665 	rump_sysproxy_arg = arg;
    666 	rump_sysproxy = proxy;
    667 
    668 	return 0;
    669 }
    670 
    671 int
    672 rump_getversion(void)
    673 {
    674 
    675 	return __NetBSD_Version__;
    676 }
    677 
    678 /*
    679  * Note: may be called unscheduled.  Not fully safe since no locking
    680  * of allevents (currently that's not even available).
    681  */
    682 void
    683 rump_printevcnts()
    684 {
    685 	struct evcnt *ev;
    686 
    687 	TAILQ_FOREACH(ev, &allevents, ev_list)
    688 		rumpuser_dprintf("%s / %s: %" PRIu64 "\n",
    689 		    ev->ev_group, ev->ev_name, ev->ev_count);
    690 }
    691 
    692 /*
    693  * If you use this interface ... well ... all bets are off.
    694  * The original purpose is for the p2k fs server library to be
    695  * able to use the same pid/lid for VOPs as the host kernel.
    696  */
    697 void
    698 rump_allbetsareoff_setid(pid_t pid, int lid)
    699 {
    700 	struct lwp *l = curlwp;
    701 	struct proc *p = l->l_proc;
    702 
    703 	l->l_lid = lid;
    704 	p->p_pid = pid;
    705 }
    706