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rump.c revision 1.196 
      1 /*	$NetBSD: rump.c,v 1.196 2010/11/04 20:54:07 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 1.196 2010/11/04 20:54:07 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 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 char rump_msgbuf[16*1024]; /* 16k should be enough for std rump needs */
    111 
    112 static void
    113 rump_aiodone_worker(struct work *wk, void *dummy)
    114 {
    115 	struct buf *bp = (struct buf *)wk;
    116 
    117 	KASSERT(&bp->b_work == wk);
    118 	bp->b_iodone(bp);
    119 }
    120 
    121 static int rump_inited;
    122 
    123 /*
    124  * Make sure pnbuf_cache is available even without vfs
    125  */
    126 struct pool_cache *pnbuf_cache;
    127 int rump_initpnbufpool(void);
    128 int rump_initpnbufpool(void)
    129 {
    130 
    131         pnbuf_cache = pool_cache_init(MAXPATHLEN, 0, 0, 0, "pnbufpl",
    132 	    NULL, IPL_NONE, NULL, NULL, NULL);
    133 	return EOPNOTSUPP;
    134 }
    135 
    136 int rump__unavailable(void);
    137 int rump__unavailable() {return EOPNOTSUPP;}
    138 __weak_alias(rump_net_init,rump__unavailable);
    139 __weak_alias(rump_vfs_init,rump_initpnbufpool);
    140 __weak_alias(rump_dev_init,rump__unavailable);
    141 
    142 __weak_alias(rump_vfs_fini,rump__unavailable);
    143 
    144 __weak_alias(biodone,rump__unavailable);
    145 __weak_alias(sopoll,rump__unavailable);
    146 
    147 __weak_alias(rump_vfs_drainbufs,rump__unavailable);
    148 
    149 void rump__unavailable_vfs_panic(void);
    150 void rump__unavailable_vfs_panic() {panic("vfs component not available");}
    151 __weak_alias(usermount_common_policy,rump__unavailable_vfs_panic);
    152 
    153 rump_proc_vfs_init_fn rump_proc_vfs_init;
    154 rump_proc_vfs_release_fn rump_proc_vfs_release;
    155 
    156 static void add_linkedin_modules(const struct modinfo *const *, size_t);
    157 
    158 static void __noinline
    159 messthestack(void)
    160 {
    161 	volatile uint32_t mess[64];
    162 	uint64_t d1, d2;
    163 	int i, error;
    164 
    165 	for (i = 0; i < 64; i++) {
    166 		rumpuser_gettime(&d1, &d2, &error);
    167 		mess[i] = d2;
    168 	}
    169 }
    170 
    171 /*
    172  * Create kern.hostname.  why only this you ask.  well, init_sysctl
    173  * is a kitchen sink in need of some gardening.  but i want to use
    174  * kern.hostname today.
    175  */
    176 static void
    177 mksysctls(void)
    178 {
    179 
    180 	sysctl_createv(NULL, 0, NULL, NULL,
    181 	    CTLFLAG_PERMANENT, CTLTYPE_NODE, "kern", NULL,
    182 	    NULL, 0, NULL, 0, CTL_KERN, CTL_EOL);
    183 
    184 	/* XXX: setting hostnamelen is missing */
    185 	sysctl_createv(NULL, 0, NULL, NULL,
    186 	    CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_STRING, "hostname",
    187 	    SYSCTL_DESCR("System hostname"), NULL, 0,
    188 	    &hostname, MAXHOSTNAMELEN, CTL_KERN, KERN_HOSTNAME, CTL_EOL);
    189 }
    190 
    191 int
    192 rump__init(int rump_version)
    193 {
    194 	struct rumpuser_sp_ops spops;
    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 	spops.spop_schedule		= rump_schedule;
    212 	spops.spop_unschedule		= rump_unschedule;
    213 	spops.spop_lwproc_switch	= rump_lwproc_switch;
    214 	spops.spop_lwproc_release	= rump_lwproc_releaselwp;
    215 	spops.spop_lwproc_newproc	= rump_lwproc_newproc;
    216 	spops.spop_lwproc_curlwp	= rump_lwproc_curlwp;
    217 	spops.spop_syscall		= rump_syscall;
    218 
    219 	if (rumpuser_getenv("RUMP_SP_SERVER", buf, sizeof(buf), &error) == 0) {
    220 		error = rumpuser_sp_init(&spops, buf);
    221 		if (error)
    222 			return error;
    223 		iamtheserver = true;
    224 	}
    225 
    226 	if (rumpuser_getversion() != RUMPUSER_VERSION) {
    227 		/* let's hope the ABI of rumpuser_dprintf is the same ;) */
    228 		rumpuser_dprintf("rumpuser version mismatch: %d vs. %d\n",
    229 		    rumpuser_getversion(), RUMPUSER_VERSION);
    230 		return EPROGMISMATCH;
    231 	}
    232 
    233 	if (rumpuser_getenv("RUMP_VERBOSE", buf, sizeof(buf), &error) == 0) {
    234 		if (*buf != '0')
    235 			boothowto = AB_VERBOSE;
    236 	}
    237 
    238 	if (rumpuser_getenv("RUMP_NCPU", buf, sizeof(buf), &error) == 0)
    239 		error = 0;
    240 	/* non-x86 is missing CPU_INFO_FOREACH() support */
    241 #if defined(__i386__) || defined(__x86_64__)
    242 	if (error == 0) {
    243 		numcpu = strtoll(buf, NULL, 10);
    244 		if (numcpu < 1)
    245 			numcpu = 1;
    246 	} else {
    247 		numcpu = rumpuser_getnhostcpu();
    248 	}
    249 #else
    250 	if (error == 0)
    251 		printf("NCPU limited to 1 on this machine architecture\n");
    252 	numcpu = 1;
    253 #endif
    254 	rump_cpus_bootstrap(numcpu);
    255 
    256 	rumpuser_gettime(&sec, &nsec, &error);
    257 	boottime.tv_sec = sec;
    258 	boottime.tv_nsec = nsec;
    259 
    260 	initmsgbuf(rump_msgbuf, sizeof(rump_msgbuf));
    261 	aprint_verbose("%s%s", copyright, version);
    262 
    263 	/*
    264 	 * Seed arc4random() with a "reasonable" amount of randomness.
    265 	 * Yes, this is a quick kludge which depends on the arc4random
    266 	 * implementation.
    267 	 */
    268 	messthestack();
    269 	arc4random();
    270 
    271 	if (rump_version != RUMP_VERSION) {
    272 		printf("rump version mismatch, %d vs. %d\n",
    273 		    rump_version, RUMP_VERSION);
    274 		return EPROGMISMATCH;
    275 	}
    276 
    277 	if (rumpuser_getenv("RUMP_THREADS", buf, sizeof(buf), &error) == 0) {
    278 		rump_threads = *buf != '0';
    279 	}
    280 	rumpuser_thrinit(rump_user_schedule, rump_user_unschedule,
    281 	    rump_threads);
    282 	rump_intr_init(numcpu);
    283 	rump_tsleep_init();
    284 
    285 	/* init minimal lwp/cpu context */
    286 	l = &lwp0;
    287 	l->l_lid = 1;
    288 	l->l_cpu = l->l_target_cpu = rump_cpu;
    289 	l->l_fd = &filedesc0;
    290 	rumpuser_set_curlwp(l);
    291 
    292 	mutex_init(&tty_lock, MUTEX_DEFAULT, IPL_NONE);
    293 	rumpuser_mutex_recursive_init(&rump_giantlock);
    294 	ksyms_init();
    295 	uvm_init();
    296 	evcnt_init();
    297 
    298 	once_init();
    299 	kernconfig_lock_init();
    300 	prop_kern_init();
    301 
    302 	pool_subsystem_init();
    303 	kmem_init();
    304 
    305 	uvm_ra_init();
    306 	uao_init();
    307 
    308 	mutex_obj_init();
    309 	callout_startup();
    310 
    311 	kprintf_init();
    312 	loginit();
    313 
    314 	kauth_init();
    315 
    316 	procinit();
    317 	proc0_init();
    318 	uid_init();
    319 	chgproccnt(0, 1);
    320 
    321 	l->l_proc = &proc0;
    322 	lwp_update_creds(l);
    323 
    324 	lwpinit_specificdata();
    325 	lwp_initspecific(&lwp0);
    326 
    327 	rump_scheduler_init(numcpu);
    328 	/* revert temporary context and schedule a semireal context */
    329 	l->l_cpu = NULL;
    330 	rumpuser_set_curlwp(NULL);
    331 	initproc = &proc0; /* borrow proc0 before we get initproc started */
    332 	rump_schedule();
    333 
    334 	percpu_init();
    335 	inittimecounter();
    336 	ntp_init();
    337 
    338 	rumpuser_gettime(&sec, &nsec, &error);
    339 	ts.tv_sec = sec;
    340 	ts.tv_nsec = nsec;
    341 	tc_setclock(&ts);
    342 
    343 	/* we are mostly go.  do per-cpu subsystem init */
    344 	for (i = 0; i < numcpu; i++) {
    345 		struct cpu_info *ci = cpu_lookup(i);
    346 
    347 		/* attach non-bootstrap CPUs */
    348 		if (i > 0) {
    349 			rump_cpu_attach(ci);
    350 			ncpu++;
    351 		}
    352 
    353 		callout_init_cpu(ci);
    354 		softint_init(ci);
    355 		xc_init_cpu(ci);
    356 		pool_cache_cpu_init(ci);
    357 		selsysinit(ci);
    358 		percpu_init_cpu(ci);
    359 
    360 		aprint_verbose("cpu%d at thinair0: rump virtual cpu\n", i);
    361 	}
    362 
    363 	sysctl_init();
    364 	mksysctls();
    365 	kqueue_init();
    366 	iostat_init();
    367 	fd_sys_init();
    368 	module_init();
    369 	devsw_init();
    370 	pipe_init();
    371 	resource_init();
    372 
    373 	/* start page baroness */
    374 	if (rump_threads) {
    375 		if (kthread_create(PRI_PGDAEMON, KTHREAD_MPSAFE, NULL,
    376 		    uvm_pageout, NULL, &uvm.pagedaemon_lwp, "pdaemon") != 0)
    377 			panic("pagedaemon create failed");
    378 	} else
    379 		uvm.pagedaemon_lwp = NULL; /* doesn't match curlwp */
    380 
    381 	/* process dso's */
    382 	rumpuser_dl_bootstrap(add_linkedin_modules, rump_kernelfsym_load);
    383 
    384 	rump_component_init(RUMP_COMPONENT_KERN);
    385 
    386 	/* these do nothing if not present */
    387 	rump_vfs_init();
    388 	rump_net_init();
    389 	rump_dev_init();
    390 
    391 	rump_component_init(RUMP_COMPONENT_KERN_VFS);
    392 
    393 	cold = 0;
    394 
    395 	/* aieeeedondest */
    396 	if (rump_threads) {
    397 		if (workqueue_create(&uvm.aiodone_queue, "aiodoned",
    398 		    rump_aiodone_worker, NULL, 0, 0, WQ_MPSAFE))
    399 			panic("aiodoned");
    400 	}
    401 
    402 	sysctl_finalize();
    403 
    404 	module_init_class(MODULE_CLASS_ANY);
    405 
    406 	rumpuser_gethostname(hostname, MAXHOSTNAMELEN, &error);
    407 	hostnamelen = strlen(hostname);
    408 
    409 	sigemptyset(&sigcantmask);
    410 
    411 	if (rump_threads)
    412 		vmem_rehash_start();
    413 
    414 	/*
    415 	 * Create init, used to attach implicit threads in rump.
    416 	 * (note: must be done after vfsinit to get cwdi)
    417 	 */
    418 	(void)rump__lwproc_alloclwp(NULL); /* dummy thread for initproc */
    419 	mutex_enter(proc_lock);
    420 	initproc = proc_find_raw(1);
    421 	mutex_exit(proc_lock);
    422 	if (initproc == NULL)
    423 		panic("where in the world is initproc?");
    424 
    425 	/* release cpu */
    426 	rump_unschedule();
    427 
    428 	return 0;
    429 }
    430 
    431 /* maybe support sys_reboot some day for remote shutdown */
    432 void
    433 rump_reboot(int howto)
    434 {
    435 
    436 	/* dump means we really take the dive here */
    437 	if ((howto & RB_DUMP) || panicstr) {
    438 		rumpuser_exit(RUMPUSER_PANIC);
    439 		/*NOTREACHED*/
    440 	}
    441 
    442 	/* try to sync */
    443 	if (!((howto & RB_NOSYNC) || panicstr)) {
    444 		rump_vfs_fini();
    445 	}
    446 
    447 	/* your wish is my command */
    448 	if (howto & RB_HALT) {
    449 		for (;;) {
    450 			uint64_t sec = 5, nsec = 0;
    451 			int error;
    452 
    453 			rumpuser_nanosleep(&sec, &nsec, &error);
    454 		}
    455 	}
    456 	rump_inited = -1;
    457 }
    458 
    459 struct uio *
    460 rump_uio_setup(void *buf, size_t bufsize, off_t offset, enum rump_uiorw rw)
    461 {
    462 	struct uio *uio;
    463 	enum uio_rw uiorw;
    464 
    465 	switch (rw) {
    466 	case RUMPUIO_READ:
    467 		uiorw = UIO_READ;
    468 		break;
    469 	case RUMPUIO_WRITE:
    470 		uiorw = UIO_WRITE;
    471 		break;
    472 	default:
    473 		panic("%s: invalid rw %d", __func__, rw);
    474 	}
    475 
    476 	uio = kmem_alloc(sizeof(struct uio), KM_SLEEP);
    477 	uio->uio_iov = kmem_alloc(sizeof(struct iovec), KM_SLEEP);
    478 
    479 	uio->uio_iov->iov_base = buf;
    480 	uio->uio_iov->iov_len = bufsize;
    481 
    482 	uio->uio_iovcnt = 1;
    483 	uio->uio_offset = offset;
    484 	uio->uio_resid = bufsize;
    485 	uio->uio_rw = uiorw;
    486 	uio->uio_vmspace = UIO_VMSPACE_SYS;
    487 
    488 	return uio;
    489 }
    490 
    491 size_t
    492 rump_uio_getresid(struct uio *uio)
    493 {
    494 
    495 	return uio->uio_resid;
    496 }
    497 
    498 off_t
    499 rump_uio_getoff(struct uio *uio)
    500 {
    501 
    502 	return uio->uio_offset;
    503 }
    504 
    505 size_t
    506 rump_uio_free(struct uio *uio)
    507 {
    508 	size_t resid;
    509 
    510 	resid = uio->uio_resid;
    511 	kmem_free(uio->uio_iov, sizeof(*uio->uio_iov));
    512 	kmem_free(uio, sizeof(*uio));
    513 
    514 	return resid;
    515 }
    516 
    517 /* rump private.  NEEDS WORK! */
    518 void
    519 rump_set_vmspace(struct vmspace *vm)
    520 {
    521 	struct proc *p = curproc;
    522 
    523 	p->p_vmspace = vm;
    524 }
    525 
    526 kauth_cred_t
    527 rump_cred_create(uid_t uid, gid_t gid, size_t ngroups, gid_t *groups)
    528 {
    529 	kauth_cred_t cred;
    530 	int rv;
    531 
    532 	cred = kauth_cred_alloc();
    533 	kauth_cred_setuid(cred, uid);
    534 	kauth_cred_seteuid(cred, uid);
    535 	kauth_cred_setsvuid(cred, uid);
    536 	kauth_cred_setgid(cred, gid);
    537 	kauth_cred_setgid(cred, gid);
    538 	kauth_cred_setegid(cred, gid);
    539 	kauth_cred_setsvgid(cred, gid);
    540 	rv = kauth_cred_setgroups(cred, groups, ngroups, 0, UIO_SYSSPACE);
    541 	/* oh this is silly.  and by "this" I mean kauth_cred_setgroups() */
    542 	assert(rv == 0);
    543 
    544 	return cred;
    545 }
    546 
    547 void
    548 rump_cred_put(kauth_cred_t cred)
    549 {
    550 
    551 	kauth_cred_free(cred);
    552 }
    553 
    554 static int compcounter[RUMP_COMPONENT_MAX];
    555 
    556 static void
    557 rump_component_init_cb(struct rump_component *rc, int type)
    558 {
    559 
    560 	KASSERT(type < RUMP_COMPONENT_MAX);
    561 	if (rc->rc_type == type) {
    562 		rc->rc_init();
    563 		compcounter[type]++;
    564 	}
    565 }
    566 
    567 int
    568 rump_component_count(enum rump_component_type type)
    569 {
    570 
    571 	KASSERT(type <= RUMP_COMPONENT_MAX);
    572 	return compcounter[type];
    573 }
    574 
    575 void
    576 rump_component_init(enum rump_component_type type)
    577 {
    578 
    579 	rumpuser_dl_component_init(type, rump_component_init_cb);
    580 }
    581 
    582 /*
    583  * Initialize a module which has already been loaded and linked
    584  * with dlopen(). This is fundamentally the same as a builtin module.
    585  */
    586 int
    587 rump_module_init(const struct modinfo * const *mip, size_t nmodinfo)
    588 {
    589 
    590 	return module_builtin_add(mip, nmodinfo, true);
    591 }
    592 
    593 /*
    594  * Finish module (flawless victory, fatality!).
    595  */
    596 int
    597 rump_module_fini(const struct modinfo *mi)
    598 {
    599 
    600 	return module_builtin_remove(mi, true);
    601 }
    602 
    603 /*
    604  * Add loaded and linked module to the builtin list.  It will
    605  * later be initialized with module_init_class().
    606  */
    607 
    608 static void
    609 add_linkedin_modules(const struct modinfo * const *mip, size_t nmodinfo)
    610 {
    611 
    612 	module_builtin_add(mip, nmodinfo, false);
    613 }
    614 
    615 int
    616 rump_kernelfsym_load(void *symtab, uint64_t symsize,
    617 	char *strtab, uint64_t strsize)
    618 {
    619 	static int inited = 0;
    620 	Elf64_Ehdr ehdr;
    621 
    622 	if (inited)
    623 		return EBUSY;
    624 	inited = 1;
    625 
    626 	/*
    627 	 * Use 64bit header since it's bigger.  Shouldn't make a
    628 	 * difference, since we're passing in all zeroes anyway.
    629 	 */
    630 	memset(&ehdr, 0, sizeof(ehdr));
    631 	ksyms_addsyms_explicit(&ehdr, symtab, symsize, strtab, strsize);
    632 
    633 	return 0;
    634 }
    635 
    636 int
    637 rump_syscall(int num, void *arg, register_t *retval)
    638 {
    639 	struct lwp *l;
    640 	struct sysent *callp;
    641 	int rv;
    642 
    643 	if (__predict_false(num >= SYS_NSYSENT))
    644 		return ENOSYS;
    645 
    646 	callp = rump_sysent + num;
    647 	l = curlwp;
    648 	if (iamtheserver)
    649 		curproc->p_vmspace = &sp_vmspace;
    650 	rv = sy_call(callp, l, (void *)arg, retval);
    651 	if (iamtheserver)
    652 		curproc->p_vmspace = &vmspace0;
    653 
    654 	return rv;
    655 }
    656 
    657 int
    658 rump_boot_gethowto()
    659 {
    660 
    661 	return boothowto;
    662 }
    663 
    664 void
    665 rump_boot_sethowto(int howto)
    666 {
    667 
    668 	boothowto = howto;
    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