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rump.c revision 1.199 
      1 /*	$NetBSD: rump.c,v 1.199 2010/11/17 21:52:29 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 1.199 2010/11/17 21:52:29 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 struct proc *initproc;
     90 
     91 struct rumpuser_mtx *rump_giantlock;
     92 
     93 struct device rump_rootdev = {
     94 	.dv_class = DV_VIRTUAL
     95 };
     96 
     97 #ifdef RUMP_WITHOUT_THREADS
     98 int rump_threads = 0;
     99 #else
    100 int rump_threads = 1;
    101 #endif
    102 
    103 /*
    104  * System call proxying support.  These deserve another look later,
    105  * but good enough for now.
    106  */
    107 static struct vmspace sp_vmspace;
    108 static bool iamtheserver = false;
    109 
    110 static int rump_proxy_syscall(int, void *, register_t *);
    111 
    112 static char rump_msgbuf[16*1024]; /* 16k should be enough for std rump needs */
    113 
    114 static void
    115 rump_aiodone_worker(struct work *wk, void *dummy)
    116 {
    117 	struct buf *bp = (struct buf *)wk;
    118 
    119 	KASSERT(&bp->b_work == wk);
    120 	bp->b_iodone(bp);
    121 }
    122 
    123 static int rump_inited;
    124 
    125 /*
    126  * Make sure pnbuf_cache is available even without vfs
    127  */
    128 struct pool_cache *pnbuf_cache;
    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 rump_proc_vfs_init_fn rump_proc_vfs_init;
    156 rump_proc_vfs_release_fn rump_proc_vfs_release;
    157 
    158 static void add_linkedin_modules(const struct modinfo *const *, size_t);
    159 
    160 static void __noinline
    161 messthestack(void)
    162 {
    163 	volatile uint32_t mess[64];
    164 	uint64_t d1, d2;
    165 	int i, error;
    166 
    167 	for (i = 0; i < 64; i++) {
    168 		rumpuser_gettime(&d1, &d2, &error);
    169 		mess[i] = d2;
    170 	}
    171 }
    172 
    173 /*
    174  * Create kern.hostname.  why only this you ask.  well, init_sysctl
    175  * is a kitchen sink in need of some gardening.  but i want to use
    176  * kern.hostname today.
    177  */
    178 static void
    179 mksysctls(void)
    180 {
    181 
    182 	sysctl_createv(NULL, 0, NULL, NULL,
    183 	    CTLFLAG_PERMANENT, CTLTYPE_NODE, "kern", NULL,
    184 	    NULL, 0, NULL, 0, CTL_KERN, CTL_EOL);
    185 
    186 	/* XXX: setting hostnamelen is missing */
    187 	sysctl_createv(NULL, 0, NULL, NULL,
    188 	    CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_STRING, "hostname",
    189 	    SYSCTL_DESCR("System hostname"), NULL, 0,
    190 	    &hostname, MAXHOSTNAMELEN, CTL_KERN, KERN_HOSTNAME, CTL_EOL);
    191 }
    192 
    193 static const struct rumpuser_sp_ops spops = {
    194 	.spop_schedule		= rump_schedule,
    195 	.spop_unschedule	= rump_unschedule,
    196 	.spop_lwproc_switch	= rump_lwproc_switch,
    197 	.spop_lwproc_release	= rump_lwproc_releaselwp,
    198 	.spop_lwproc_newproc	= rump_lwproc_newproc,
    199 	.spop_lwproc_curlwp	= rump_lwproc_curlwp,
    200 	.spop_syscall		= rump_proxy_syscall,
    201 };
    202 
    203 int
    204 rump__init(int rump_version)
    205 {
    206 	char buf[256];
    207 	struct timespec ts;
    208 	uint64_t sec, nsec;
    209 	struct lwp *l;
    210 	int i, numcpu;
    211 	int error;
    212 
    213 	/* not reentrant */
    214 	if (rump_inited)
    215 		return 0;
    216 	else if (rump_inited == -1)
    217 		panic("rump_init: host process restart required");
    218 	else
    219 		rump_inited = 1;
    220 
    221 	/* Check our role as a rump proxy */
    222 	if (rumpuser_getenv("RUMP_SP_SERVER", buf, sizeof(buf), &error) == 0) {
    223 		error = rumpuser_sp_init(&spops, buf);
    224 		if (error)
    225 			return error;
    226 		iamtheserver = true;
    227 	}
    228 
    229 	if (rumpuser_getversion() != RUMPUSER_VERSION) {
    230 		/* let's hope the ABI of rumpuser_dprintf is the same ;) */
    231 		rumpuser_dprintf("rumpuser version mismatch: %d vs. %d\n",
    232 		    rumpuser_getversion(), RUMPUSER_VERSION);
    233 		return EPROGMISMATCH;
    234 	}
    235 
    236 	if (rumpuser_getenv("RUMP_VERBOSE", buf, sizeof(buf), &error) == 0) {
    237 		if (*buf != '0')
    238 			boothowto = AB_VERBOSE;
    239 	}
    240 
    241 	if (rumpuser_getenv("RUMP_NCPU", buf, sizeof(buf), &error) == 0)
    242 		error = 0;
    243 	/* non-x86 is missing CPU_INFO_FOREACH() support */
    244 #if defined(__i386__) || defined(__x86_64__)
    245 	if (error == 0) {
    246 		numcpu = strtoll(buf, NULL, 10);
    247 		if (numcpu < 1)
    248 			numcpu = 1;
    249 	} else {
    250 		numcpu = rumpuser_getnhostcpu();
    251 	}
    252 #else
    253 	if (error == 0)
    254 		printf("NCPU limited to 1 on this machine architecture\n");
    255 	numcpu = 1;
    256 #endif
    257 	rump_cpus_bootstrap(numcpu);
    258 
    259 	rumpuser_gettime(&sec, &nsec, &error);
    260 	boottime.tv_sec = sec;
    261 	boottime.tv_nsec = nsec;
    262 
    263 	initmsgbuf(rump_msgbuf, sizeof(rump_msgbuf));
    264 	aprint_verbose("%s%s", copyright, version);
    265 
    266 	/*
    267 	 * Seed arc4random() with a "reasonable" amount of randomness.
    268 	 * Yes, this is a quick kludge which depends on the arc4random
    269 	 * implementation.
    270 	 */
    271 	messthestack();
    272 	arc4random();
    273 
    274 	if (rump_version != RUMP_VERSION) {
    275 		printf("rump version mismatch, %d vs. %d\n",
    276 		    rump_version, RUMP_VERSION);
    277 		return EPROGMISMATCH;
    278 	}
    279 
    280 	if (rumpuser_getenv("RUMP_THREADS", buf, sizeof(buf), &error) == 0) {
    281 		rump_threads = *buf != '0';
    282 	}
    283 	rumpuser_thrinit(rump_user_schedule, rump_user_unschedule,
    284 	    rump_threads);
    285 	rump_intr_init(numcpu);
    286 	rump_tsleep_init();
    287 
    288 	/* init minimal lwp/cpu context */
    289 	l = &lwp0;
    290 	l->l_lid = 1;
    291 	l->l_cpu = l->l_target_cpu = rump_cpu;
    292 	l->l_fd = &filedesc0;
    293 	rumpuser_set_curlwp(l);
    294 
    295 	mutex_init(&tty_lock, MUTEX_DEFAULT, IPL_NONE);
    296 	rumpuser_mutex_recursive_init(&rump_giantlock);
    297 	ksyms_init();
    298 	uvm_init();
    299 	evcnt_init();
    300 
    301 	once_init();
    302 	kernconfig_lock_init();
    303 	prop_kern_init();
    304 
    305 	pool_subsystem_init();
    306 	kmem_init();
    307 
    308 	uvm_ra_init();
    309 	uao_init();
    310 
    311 	mutex_obj_init();
    312 	callout_startup();
    313 
    314 	kprintf_init();
    315 	loginit();
    316 
    317 	kauth_init();
    318 
    319 	procinit();
    320 	proc0_init();
    321 	uid_init();
    322 	chgproccnt(0, 1);
    323 
    324 	l->l_proc = &proc0;
    325 	lwp_update_creds(l);
    326 
    327 	lwpinit_specificdata();
    328 	lwp_initspecific(&lwp0);
    329 
    330 	rump_scheduler_init(numcpu);
    331 	/* revert temporary context and schedule a semireal context */
    332 	l->l_cpu = NULL;
    333 	rumpuser_set_curlwp(NULL);
    334 	initproc = &proc0; /* borrow proc0 before we get initproc started */
    335 	rump_schedule();
    336 
    337 	percpu_init();
    338 	inittimecounter();
    339 	ntp_init();
    340 
    341 	rumpuser_gettime(&sec, &nsec, &error);
    342 	ts.tv_sec = sec;
    343 	ts.tv_nsec = nsec;
    344 	tc_setclock(&ts);
    345 
    346 	/* we are mostly go.  do per-cpu subsystem init */
    347 	for (i = 0; i < numcpu; i++) {
    348 		struct cpu_info *ci = cpu_lookup(i);
    349 
    350 		/* attach non-bootstrap CPUs */
    351 		if (i > 0) {
    352 			rump_cpu_attach(ci);
    353 			ncpu++;
    354 		}
    355 
    356 		callout_init_cpu(ci);
    357 		softint_init(ci);
    358 		xc_init_cpu(ci);
    359 		pool_cache_cpu_init(ci);
    360 		selsysinit(ci);
    361 		percpu_init_cpu(ci);
    362 
    363 		aprint_verbose("cpu%d at thinair0: rump virtual cpu\n", i);
    364 	}
    365 
    366 	sysctl_init();
    367 	mksysctls();
    368 	kqueue_init();
    369 	iostat_init();
    370 	fd_sys_init();
    371 	module_init();
    372 	devsw_init();
    373 	pipe_init();
    374 	resource_init();
    375 
    376 	/* start page baroness */
    377 	if (rump_threads) {
    378 		if (kthread_create(PRI_PGDAEMON, KTHREAD_MPSAFE, NULL,
    379 		    uvm_pageout, NULL, &uvm.pagedaemon_lwp, "pdaemon") != 0)
    380 			panic("pagedaemon create failed");
    381 	} else
    382 		uvm.pagedaemon_lwp = NULL; /* doesn't match curlwp */
    383 
    384 	/* process dso's */
    385 	rumpuser_dl_bootstrap(add_linkedin_modules, rump_kernelfsym_load);
    386 
    387 	rump_component_init(RUMP_COMPONENT_KERN);
    388 
    389 	/* these do nothing if not present */
    390 	rump_vfs_init();
    391 	rump_net_init();
    392 	rump_dev_init();
    393 
    394 	rump_component_init(RUMP_COMPONENT_KERN_VFS);
    395 
    396 	cold = 0;
    397 
    398 	/* aieeeedondest */
    399 	if (rump_threads) {
    400 		if (workqueue_create(&uvm.aiodone_queue, "aiodoned",
    401 		    rump_aiodone_worker, NULL, 0, 0, WQ_MPSAFE))
    402 			panic("aiodoned");
    403 	}
    404 
    405 	sysctl_finalize();
    406 
    407 	module_init_class(MODULE_CLASS_ANY);
    408 
    409 	rumpuser_gethostname(hostname, MAXHOSTNAMELEN, &error);
    410 	hostnamelen = strlen(hostname);
    411 
    412 	sigemptyset(&sigcantmask);
    413 
    414 	if (rump_threads)
    415 		vmem_rehash_start();
    416 
    417 	/*
    418 	 * Create init, used to attach implicit threads in rump.
    419 	 * (note: must be done after vfsinit to get cwdi)
    420 	 */
    421 	(void)rump__lwproc_alloclwp(NULL); /* dummy thread for initproc */
    422 	mutex_enter(proc_lock);
    423 	initproc = proc_find_raw(1);
    424 	mutex_exit(proc_lock);
    425 	if (initproc == NULL)
    426 		panic("where in the world is initproc?");
    427 
    428 	/* release cpu */
    429 	rump_unschedule();
    430 
    431 	return 0;
    432 }
    433 
    434 /* maybe support sys_reboot some day for remote shutdown */
    435 void
    436 rump_reboot(int howto)
    437 {
    438 
    439 	/* dump means we really take the dive here */
    440 	if ((howto & RB_DUMP) || panicstr) {
    441 		rumpuser_exit(RUMPUSER_PANIC);
    442 		/*NOTREACHED*/
    443 	}
    444 
    445 	/* try to sync */
    446 	if (!((howto & RB_NOSYNC) || panicstr)) {
    447 		rump_vfs_fini();
    448 	}
    449 
    450 	/* your wish is my command */
    451 	if (howto & RB_HALT) {
    452 		for (;;) {
    453 			uint64_t sec = 5, nsec = 0;
    454 			int error;
    455 
    456 			rumpuser_nanosleep(&sec, &nsec, &error);
    457 		}
    458 	}
    459 	rump_inited = -1;
    460 }
    461 
    462 struct uio *
    463 rump_uio_setup(void *buf, size_t bufsize, off_t offset, enum rump_uiorw rw)
    464 {
    465 	struct uio *uio;
    466 	enum uio_rw uiorw;
    467 
    468 	switch (rw) {
    469 	case RUMPUIO_READ:
    470 		uiorw = UIO_READ;
    471 		break;
    472 	case RUMPUIO_WRITE:
    473 		uiorw = UIO_WRITE;
    474 		break;
    475 	default:
    476 		panic("%s: invalid rw %d", __func__, rw);
    477 	}
    478 
    479 	uio = kmem_alloc(sizeof(struct uio), KM_SLEEP);
    480 	uio->uio_iov = kmem_alloc(sizeof(struct iovec), KM_SLEEP);
    481 
    482 	uio->uio_iov->iov_base = buf;
    483 	uio->uio_iov->iov_len = bufsize;
    484 
    485 	uio->uio_iovcnt = 1;
    486 	uio->uio_offset = offset;
    487 	uio->uio_resid = bufsize;
    488 	uio->uio_rw = uiorw;
    489 	UIO_SETUP_SYSSPACE(uio);
    490 
    491 	return uio;
    492 }
    493 
    494 size_t
    495 rump_uio_getresid(struct uio *uio)
    496 {
    497 
    498 	return uio->uio_resid;
    499 }
    500 
    501 off_t
    502 rump_uio_getoff(struct uio *uio)
    503 {
    504 
    505 	return uio->uio_offset;
    506 }
    507 
    508 size_t
    509 rump_uio_free(struct uio *uio)
    510 {
    511 	size_t resid;
    512 
    513 	resid = uio->uio_resid;
    514 	kmem_free(uio->uio_iov, sizeof(*uio->uio_iov));
    515 	kmem_free(uio, sizeof(*uio));
    516 
    517 	return resid;
    518 }
    519 
    520 /* rump private.  NEEDS WORK! */
    521 void
    522 rump_set_vmspace(struct vmspace *vm)
    523 {
    524 	struct proc *p = curproc;
    525 
    526 	p->p_vmspace = vm;
    527 }
    528 
    529 kauth_cred_t
    530 rump_cred_create(uid_t uid, gid_t gid, size_t ngroups, gid_t *groups)
    531 {
    532 	kauth_cred_t cred;
    533 	int rv;
    534 
    535 	cred = kauth_cred_alloc();
    536 	kauth_cred_setuid(cred, uid);
    537 	kauth_cred_seteuid(cred, uid);
    538 	kauth_cred_setsvuid(cred, uid);
    539 	kauth_cred_setgid(cred, gid);
    540 	kauth_cred_setgid(cred, gid);
    541 	kauth_cred_setegid(cred, gid);
    542 	kauth_cred_setsvgid(cred, gid);
    543 	rv = kauth_cred_setgroups(cred, groups, ngroups, 0, UIO_SYSSPACE);
    544 	/* oh this is silly.  and by "this" I mean kauth_cred_setgroups() */
    545 	assert(rv == 0);
    546 
    547 	return cred;
    548 }
    549 
    550 void
    551 rump_cred_put(kauth_cred_t cred)
    552 {
    553 
    554 	kauth_cred_free(cred);
    555 }
    556 
    557 static int compcounter[RUMP_COMPONENT_MAX];
    558 
    559 static void
    560 rump_component_init_cb(struct rump_component *rc, int type)
    561 {
    562 
    563 	KASSERT(type < RUMP_COMPONENT_MAX);
    564 	if (rc->rc_type == type) {
    565 		rc->rc_init();
    566 		compcounter[type]++;
    567 	}
    568 }
    569 
    570 int
    571 rump_component_count(enum rump_component_type type)
    572 {
    573 
    574 	KASSERT(type <= RUMP_COMPONENT_MAX);
    575 	return compcounter[type];
    576 }
    577 
    578 void
    579 rump_component_init(enum rump_component_type type)
    580 {
    581 
    582 	rumpuser_dl_component_init(type, rump_component_init_cb);
    583 }
    584 
    585 /*
    586  * Initialize a module which has already been loaded and linked
    587  * with dlopen(). This is fundamentally the same as a builtin module.
    588  */
    589 int
    590 rump_module_init(const struct modinfo * const *mip, size_t nmodinfo)
    591 {
    592 
    593 	return module_builtin_add(mip, nmodinfo, true);
    594 }
    595 
    596 /*
    597  * Finish module (flawless victory, fatality!).
    598  */
    599 int
    600 rump_module_fini(const struct modinfo *mi)
    601 {
    602 
    603 	return module_builtin_remove(mi, true);
    604 }
    605 
    606 /*
    607  * Add loaded and linked module to the builtin list.  It will
    608  * later be initialized with module_init_class().
    609  */
    610 
    611 static void
    612 add_linkedin_modules(const struct modinfo * const *mip, size_t nmodinfo)
    613 {
    614 
    615 	module_builtin_add(mip, nmodinfo, false);
    616 }
    617 
    618 int
    619 rump_kernelfsym_load(void *symtab, uint64_t symsize,
    620 	char *strtab, uint64_t strsize)
    621 {
    622 	static int inited = 0;
    623 	Elf64_Ehdr ehdr;
    624 
    625 	if (inited)
    626 		return EBUSY;
    627 	inited = 1;
    628 
    629 	/*
    630 	 * Use 64bit header since it's bigger.  Shouldn't make a
    631 	 * difference, since we're passing in all zeroes anyway.
    632 	 */
    633 	memset(&ehdr, 0, sizeof(ehdr));
    634 	ksyms_addsyms_explicit(&ehdr, symtab, symsize, strtab, strsize);
    635 
    636 	return 0;
    637 }
    638 
    639 static int
    640 rump_proxy_syscall(int num, void *arg, register_t *retval)
    641 {
    642 	struct lwp *l;
    643 	struct sysent *callp;
    644 	int rv;
    645 
    646 	if (__predict_false(num >= SYS_NSYSENT))
    647 		return ENOSYS;
    648 
    649 	callp = rump_sysent + num;
    650 	l = curlwp;
    651 	curproc->p_vmspace = &sp_vmspace;
    652 	rv = sy_call(callp, l, (void *)arg, retval);
    653 	curproc->p_vmspace = vmspace_kernel();
    654 
    655 	return rv;
    656 }
    657 
    658 int
    659 rump_boot_gethowto()
    660 {
    661 
    662 	return boothowto;
    663 }
    664 
    665 void
    666 rump_boot_sethowto(int howto)
    667 {
    668 
    669 	boothowto = howto;
    670 }
    671 
    672 int
    673 rump_getversion(void)
    674 {
    675 
    676 	return __NetBSD_Version__;
    677 }
    678 
    679 /*
    680  * Note: may be called unscheduled.  Not fully safe since no locking
    681  * of allevents (currently that's not even available).
    682  */
    683 void
    684 rump_printevcnts()
    685 {
    686 	struct evcnt *ev;
    687 
    688 	TAILQ_FOREACH(ev, &allevents, ev_list)
    689 		rumpuser_dprintf("%s / %s: %" PRIu64 "\n",
    690 		    ev->ev_group, ev->ev_name, ev->ev_count);
    691 }
    692 
    693 /*
    694  * If you use this interface ... well ... all bets are off.
    695  * The original purpose is for the p2k fs server library to be
    696  * able to use the same pid/lid for VOPs as the host kernel.
    697  */
    698 void
    699 rump_allbetsareoff_setid(pid_t pid, int lid)
    700 {
    701 	struct lwp *l = curlwp;
    702 	struct proc *p = l->l_proc;
    703 
    704 	l->l_lid = lid;
    705 	p->p_pid = pid;
    706 }
    707