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rump.c revision 1.148 
      1 /*	$NetBSD: rump.c,v 1.148 2009/12/16 20:59:04 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 1.148 2009/12/16 20:59:04 pooka Exp $");
     32 
     33 #include <sys/param.h>
     34 #include <sys/atomic.h>
     35 #include <sys/buf.h>
     36 #include <sys/callout.h>
     37 #include <sys/conf.h>
     38 #include <sys/cpu.h>
     39 #include <sys/device.h>
     40 #include <sys/evcnt.h>
     41 #include <sys/event.h>
     42 #include <sys/exec_elf.h>
     43 #include <sys/filedesc.h>
     44 #include <sys/iostat.h>
     45 #include <sys/kauth.h>
     46 #include <sys/kernel.h>
     47 #include <sys/kmem.h>
     48 #include <sys/kprintf.h>
     49 #include <sys/ksyms.h>
     50 #include <sys/msgbuf.h>
     51 #include <sys/module.h>
     52 #include <sys/once.h>
     53 #include <sys/percpu.h>
     54 #include <sys/pipe.h>
     55 #include <sys/queue.h>
     56 #include <sys/reboot.h>
     57 #include <sys/resourcevar.h>
     58 #include <sys/select.h>
     59 #include <sys/sysctl.h>
     60 #include <sys/syscall.h>
     61 #include <sys/tty.h>
     62 #include <sys/uidinfo.h>
     63 #include <sys/vmem.h>
     64 #include <sys/xcall.h>
     65 
     66 #include <rump/rumpuser.h>
     67 
     68 #include <secmodel/suser/suser.h>
     69 
     70 #include <prop/proplib.h>
     71 
     72 #include <uvm/uvm_readahead.h>
     73 
     74 #include "rump_private.h"
     75 #include "rump_net_private.h"
     76 #include "rump_vfs_private.h"
     77 #include "rump_dev_private.h"
     78 
     79 struct proc proc0;
     80 struct session rump_session = {
     81 	.s_count = 1,
     82 	.s_flags = 0,
     83 	.s_leader = &proc0,
     84 	.s_login = "rumphobo",
     85 	.s_sid = 0,
     86 };
     87 struct pgrp rump_pgrp = {
     88 	.pg_members = LIST_HEAD_INITIALIZER(pg_members),
     89 	.pg_session = &rump_session,
     90 	.pg_jobc = 1,
     91 };
     92 struct pstats rump_stats;
     93 struct plimit rump_limits;
     94 struct filedesc rump_filedesc0;
     95 struct proclist allproc;
     96 char machine[] = "rump";
     97 static kauth_cred_t rump_susercred;
     98 
     99 /* pretend the master rump proc is init */
    100 struct proc *initproc = &proc0;
    101 
    102 struct rumpuser_mtx *rump_giantlock;
    103 
    104 sigset_t sigcantmask;
    105 
    106 struct device rump_rootdev = {
    107 	.dv_class = DV_VIRTUAL
    108 };
    109 
    110 #ifdef RUMP_WITHOUT_THREADS
    111 int rump_threads = 0;
    112 #else
    113 int rump_threads = 1;
    114 #endif
    115 
    116 static void
    117 rump_aiodone_worker(struct work *wk, void *dummy)
    118 {
    119 	struct buf *bp = (struct buf *)wk;
    120 
    121 	KASSERT(&bp->b_work == wk);
    122 	bp->b_iodone(bp);
    123 }
    124 
    125 static int rump_inited;
    126 static struct emul emul_rump = {
    127 	.e_vm_default_addr = uvm_default_mapaddr,
    128 };
    129 
    130 int rump__unavailable(void);
    131 int rump__unavailable() {return EOPNOTSUPP;}
    132 __weak_alias(rump_net_init,rump__unavailable);
    133 __weak_alias(rump_vfs_init,rump__unavailable);
    134 __weak_alias(rump_dev_init,rump__unavailable);
    135 
    136 __weak_alias(rump_vfs_fini,rump__unavailable);
    137 
    138 __weak_alias(biodone,rump__unavailable);
    139 __weak_alias(sopoll,rump__unavailable);
    140 
    141 void rump__unavailable_vfs_panic(void);
    142 void rump__unavailable_vfs_panic() {panic("vfs component not available");}
    143 __weak_alias(usermount_common_policy,rump__unavailable_vfs_panic);
    144 
    145 rump_proc_vfs_init_fn rump_proc_vfs_init;
    146 rump_proc_vfs_release_fn rump_proc_vfs_release;
    147 
    148 /*
    149  * Stir up the stack a bit.  These are exported functions to help
    150  * convince the compiler that we don't want these routines completely
    151  * optimized out or inlined.  Is there an easier way to do this?
    152  */
    153 void nullfn(uint32_t *);
    154 void nullfn(uint32_t *arg){}
    155 void messthestack(void);
    156 void
    157 messthestack(void)
    158 {
    159 	uint32_t mess[64];
    160 	uint64_t d1, d2;
    161 	int i, error;
    162 
    163 	for (i = 0; i < 64; i++) {
    164 		rumpuser_gettime(&d1, &d2, &error);
    165 		mess[i] = d2;
    166 	}
    167 	nullfn(mess);
    168 }
    169 
    170 int
    171 rump__init(int rump_version)
    172 {
    173 	char buf[256];
    174 	struct proc *p;
    175 	struct lwp *l;
    176 	int i;
    177 	int error;
    178 
    179 	/* not reentrant */
    180 	if (rump_inited)
    181 		return 0;
    182 	else if (rump_inited == -1)
    183 		panic("rump_init: host process restart required");
    184 	else
    185 		rump_inited = 1;
    186 
    187 	/* Print some silly banners for spammy bootstrap. */
    188 	if (boothowto & AB_VERBOSE) {
    189 		printf("%s%s", copyright, version);
    190 	}
    191 
    192 	/*
    193 	 * Seed arc4random() with a "reasonable" amount of randomness.
    194 	 * Yes, this is a quick kludge which depends on the arc4random
    195 	 * implementation.
    196 	 */
    197 	messthestack();
    198 	arc4random();
    199 
    200 	if (rump_version != RUMP_VERSION) {
    201 		printf("rump version mismatch, %d vs. %d\n",
    202 		    rump_version, RUMP_VERSION);
    203 		return EPROGMISMATCH;
    204 	}
    205 
    206 	if (rumpuser_getenv("RUMP_THREADS", buf, sizeof(buf), &error) == 0) {
    207 		rump_threads = *buf != '0';
    208 	}
    209 	rumpuser_thrinit(rump_user_schedule, rump_user_unschedule,
    210 	    rump_threads);
    211 	rump_intr_init();
    212 
    213 	/* init minimal lwp/cpu context */
    214 	l = &lwp0;
    215 	l->l_lid = 1;
    216 	l->l_cpu = rump_cpu;
    217 	rumpuser_set_curlwp(l);
    218 
    219 	mutex_init(&tty_lock, MUTEX_DEFAULT, IPL_NONE);
    220 	rumpuser_mutex_recursive_init(&rump_giantlock);
    221 	ksyms_init();
    222 	rumpvm_init();
    223 	evcnt_init();
    224 
    225 	once_init();
    226 	prop_kern_init();
    227 
    228 	pool_subsystem_init();
    229 	kmem_init();
    230 
    231 	uvm_ra_init();
    232 
    233 	mutex_obj_init();
    234 	callout_startup();
    235 
    236 	kprintf_init();
    237 	loginit();
    238 
    239 	kauth_init();
    240 	rump_susercred = rump_cred_create(0, 0, 0, NULL);
    241 
    242 	/* init proc0 and rest of lwp0 now that we can allocate memory */
    243 	p = &proc0;
    244 	p->p_stats = &rump_stats;
    245 	p->p_limit = &rump_limits;
    246 	p->p_pgrp = &rump_pgrp;
    247 	p->p_pid = 0;
    248 	p->p_fd = &rump_filedesc0;
    249 	p->p_vmspace = &rump_vmspace;
    250 	p->p_emul = &emul_rump;
    251 	p->p_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
    252 	l->l_cred = rump_cred_suserget();
    253 	l->l_proc = p;
    254 	LIST_INIT(&allproc);
    255 	LIST_INSERT_HEAD(&allproc, &proc0, p_list);
    256 	proc_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
    257 
    258 	rump_limits.pl_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
    259 	rump_limits.pl_rlimit[RLIMIT_NOFILE].rlim_cur = RLIM_INFINITY;
    260 	rump_limits.pl_rlimit[RLIMIT_SBSIZE].rlim_cur = RLIM_INFINITY;
    261 
    262 	rump_scheduler_init();
    263 	/* revert temporary context and schedule a real context */
    264 	l->l_cpu = NULL;
    265 	rumpuser_set_curlwp(NULL);
    266 	rump_schedule();
    267 
    268 	/* we are mostly go.  do per-cpu subsystem init */
    269 	for (i = 0; i < ncpu; i++) {
    270 		struct cpu_info *ci = cpu_lookup(i);
    271 
    272 		callout_init_cpu(ci);
    273 		softint_init(ci);
    274 		xc_init_cpu(ci);
    275 		pool_cache_cpu_init(ci);
    276 		selsysinit(ci);
    277 	}
    278 
    279 	sysctl_init();
    280 	kqueue_init();
    281 	iostat_init();
    282 	uid_init();
    283 	percpu_init();
    284 	fd_sys_init();
    285 	module_init();
    286 	devsw_init();
    287 	pipe_init();
    288 
    289 	/* these do nothing if not present */
    290 	rump_vfs_init();
    291 	rump_net_init();
    292 	rump_dev_init();
    293 	cold = 0;
    294 
    295 	/* aieeeedondest */
    296 	if (rump_threads) {
    297 		if (workqueue_create(&uvm.aiodone_queue, "aiodoned",
    298 		    rump_aiodone_worker, NULL, 0, 0, WQ_MPSAFE))
    299 			panic("aiodoned");
    300 	}
    301 
    302 	sysctl_finalize();
    303 
    304 	rumpuser_dl_module_bootstrap(rump_module_init, rump_kernelfsym_load);
    305 
    306 	rumpuser_gethostname(hostname, MAXHOSTNAMELEN, &error);
    307 	hostnamelen = strlen(hostname);
    308 
    309 	sigemptyset(&sigcantmask);
    310 
    311 	lwp0.l_fd = proc0.p_fd = fd_init(&rump_filedesc0);
    312 
    313 	if (rump_threads)
    314 		vmem_rehash_start();
    315 
    316 	rump_unschedule();
    317 
    318 	return 0;
    319 }
    320 
    321 /* maybe support sys_reboot some day for remote shutdown */
    322 void
    323 rump_reboot(int howto)
    324 {
    325 
    326 	/* dump means we really take the dive here */
    327 	if ((howto & RB_DUMP) || panicstr) {
    328 		rumpuser_exit(RUMPUSER_PANIC);
    329 		/*NOTREACHED*/
    330 	}
    331 
    332 	/* try to sync */
    333 	if (!((howto & RB_NOSYNC) || panicstr)) {
    334 		rump_vfs_fini();
    335 	}
    336 
    337 	/* your wish is my command */
    338 	if (howto & RB_HALT) {
    339 		for (;;) {
    340 			uint64_t sec = 5, nsec = 0;
    341 			int error;
    342 
    343 			rumpuser_nanosleep(&sec, &nsec, &error);
    344 		}
    345 	}
    346 	rump_inited = -1;
    347 }
    348 
    349 struct uio *
    350 rump_uio_setup(void *buf, size_t bufsize, off_t offset, enum rump_uiorw rw)
    351 {
    352 	struct uio *uio;
    353 	enum uio_rw uiorw;
    354 
    355 	switch (rw) {
    356 	case RUMPUIO_READ:
    357 		uiorw = UIO_READ;
    358 		break;
    359 	case RUMPUIO_WRITE:
    360 		uiorw = UIO_WRITE;
    361 		break;
    362 	default:
    363 		panic("%s: invalid rw %d", __func__, rw);
    364 	}
    365 
    366 	uio = kmem_alloc(sizeof(struct uio), KM_SLEEP);
    367 	uio->uio_iov = kmem_alloc(sizeof(struct iovec), KM_SLEEP);
    368 
    369 	uio->uio_iov->iov_base = buf;
    370 	uio->uio_iov->iov_len = bufsize;
    371 
    372 	uio->uio_iovcnt = 1;
    373 	uio->uio_offset = offset;
    374 	uio->uio_resid = bufsize;
    375 	uio->uio_rw = uiorw;
    376 	uio->uio_vmspace = UIO_VMSPACE_SYS;
    377 
    378 	return uio;
    379 }
    380 
    381 size_t
    382 rump_uio_getresid(struct uio *uio)
    383 {
    384 
    385 	return uio->uio_resid;
    386 }
    387 
    388 off_t
    389 rump_uio_getoff(struct uio *uio)
    390 {
    391 
    392 	return uio->uio_offset;
    393 }
    394 
    395 size_t
    396 rump_uio_free(struct uio *uio)
    397 {
    398 	size_t resid;
    399 
    400 	resid = uio->uio_resid;
    401 	kmem_free(uio->uio_iov, sizeof(*uio->uio_iov));
    402 	kmem_free(uio, sizeof(*uio));
    403 
    404 	return resid;
    405 }
    406 
    407 static pid_t nextpid = 1;
    408 struct lwp *
    409 rump_newproc_switch()
    410 {
    411 	struct lwp *l;
    412 	pid_t mypid;
    413 
    414 	mypid = atomic_inc_uint_nv(&nextpid);
    415 	if (__predict_false(mypid == 0))
    416 		mypid = atomic_inc_uint_nv(&nextpid);
    417 
    418 	l = rump_lwp_alloc(mypid, 0);
    419 	rump_lwp_switch(l);
    420 
    421 	return l;
    422 }
    423 
    424 struct lwp *
    425 rump_lwp_alloc_and_switch(pid_t pid, lwpid_t lid)
    426 {
    427 	struct lwp *l;
    428 
    429 	l = rump_lwp_alloc(pid, lid);
    430 	rump_lwp_switch(l);
    431 
    432 	return l;
    433 }
    434 
    435 struct lwp *
    436 rump_lwp_alloc(pid_t pid, lwpid_t lid)
    437 {
    438 	struct lwp *l;
    439 	struct proc *p;
    440 
    441 	l = kmem_zalloc(sizeof(*l), KM_SLEEP);
    442 	if (pid != 0) {
    443 		p = kmem_zalloc(sizeof(*p), KM_SLEEP);
    444 		if (rump_proc_vfs_init)
    445 			rump_proc_vfs_init(p);
    446 		p->p_stats = &rump_stats;
    447 		p->p_limit = &rump_limits;
    448 		p->p_pid = pid;
    449 		p->p_vmspace = &rump_vmspace;
    450 		p->p_emul = &emul_rump;
    451 		p->p_fd = fd_init(NULL);
    452 		p->p_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
    453 		l->l_cred = rump_cred_suserget();
    454 	} else {
    455 		p = &proc0;
    456 		l->l_cred = rump_susercred;
    457 	}
    458 
    459 	l->l_proc = p;
    460 	l->l_lid = lid;
    461 	l->l_fd = p->p_fd;
    462 	l->l_cpu = NULL;
    463 
    464 	return l;
    465 }
    466 
    467 void
    468 rump_lwp_switch(struct lwp *newlwp)
    469 {
    470 	struct lwp *l = curlwp;
    471 
    472 	rumpuser_set_curlwp(NULL);
    473 	newlwp->l_cpu = l->l_cpu;
    474 	newlwp->l_mutex = l->l_mutex;
    475 	l->l_mutex = NULL;
    476 	l->l_cpu = NULL;
    477 	rumpuser_set_curlwp(newlwp);
    478 	if (l->l_flag & LW_WEXIT)
    479 		rump_lwp_free(l);
    480 }
    481 
    482 /* XXX: this has effect only on non-pid0 lwps */
    483 void
    484 rump_lwp_release(struct lwp *l)
    485 {
    486 	struct proc *p;
    487 
    488 	p = l->l_proc;
    489 	if (p->p_pid != 0) {
    490 		mutex_obj_free(p->p_lock);
    491 		fd_free();
    492 		if (rump_proc_vfs_release)
    493 			rump_proc_vfs_release(p);
    494 		rump_cred_put(l->l_cred);
    495 		kmem_free(p, sizeof(*p));
    496 	}
    497 	KASSERT((l->l_flag & LW_WEXIT) == 0);
    498 	l->l_flag |= LW_WEXIT;
    499 }
    500 
    501 void
    502 rump_lwp_free(struct lwp *l)
    503 {
    504 
    505 	KASSERT(l->l_flag & LW_WEXIT);
    506 	KASSERT(l->l_mutex == NULL);
    507 	kmem_free(l, sizeof(*l));
    508 }
    509 
    510 struct lwp *
    511 rump_lwp_curlwp(void)
    512 {
    513 	struct lwp *l = curlwp;
    514 
    515 	if (l->l_flag & LW_WEXIT)
    516 		return NULL;
    517 	return l;
    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 kauth_cred_t
    558 rump_cred_suserget(void)
    559 {
    560 
    561 	kauth_cred_hold(rump_susercred);
    562 	return rump_susercred;
    563 }
    564 
    565 /*
    566  * Return the next system lwpid
    567  */
    568 lwpid_t
    569 rump_nextlid(void)
    570 {
    571 	lwpid_t retid;
    572 
    573 	mutex_enter(proc0.p_lock);
    574 	/*
    575 	 * Take next one, don't return 0
    576 	 * XXX: most likely we'll have collisions in case this
    577 	 * wraps around.
    578 	 */
    579 	if (++proc0.p_nlwpid == 0)
    580 		++proc0.p_nlwpid;
    581 	retid = proc0.p_nlwpid;
    582 	mutex_exit(proc0.p_lock);
    583 
    584 	return retid;
    585 }
    586 
    587 #define ERROUT(err) do { rv = err; goto out; } while (/*CONSTCOND*/0)
    588 int
    589 rump_module_init(struct modinfo *mi, prop_dictionary_t props)
    590 {
    591 	struct module *mod;
    592 	int rv;
    593 
    594 	/* module_dummy */
    595 	if (mi->mi_name == NULL)
    596 		return EINVAL;
    597 
    598 	mutex_enter(&module_lock);
    599 	if (module_lookup(mi->mi_name))
    600 		ERROUT(EEXIST);
    601 
    602 	if (!module_compatible(mi->mi_version, __NetBSD_Version__))
    603 		ERROUT(EPROGMISMATCH);
    604 
    605 	rv = mi->mi_modcmd(MODULE_CMD_INIT, props);
    606 	if (rv == 0) {
    607 		mod = kmem_zalloc(sizeof(*mod), KM_SLEEP);
    608 		mod->mod_info = mi;
    609 		module_enqueue(mod);
    610 		if (mi->mi_class == MODULE_CLASS_SECMODEL)
    611 			secmodel_register();
    612 	}
    613 
    614  out:
    615 	mutex_exit(&module_lock);
    616 	return rv;
    617 }
    618 
    619 int
    620 rump_module_fini(struct modinfo *mi)
    621 {
    622 	int rv;
    623 
    624 	rv = mi->mi_modcmd(MODULE_CMD_FINI, NULL);
    625 	if (rv == 0 && mi->mi_class == MODULE_CLASS_SECMODEL)
    626 		secmodel_deregister();
    627 
    628 	return rv;
    629 }
    630 
    631 int
    632 rump_kernelfsym_load(void *symtab, uint64_t symsize,
    633 	char *strtab, uint64_t strsize)
    634 {
    635 	static int inited = 0;
    636 	Elf64_Ehdr ehdr;
    637 
    638 	if (inited)
    639 		return EBUSY;
    640 	inited = 1;
    641 
    642 	/*
    643 	 * Use 64bit header since it's bigger.  Shouldn't make a
    644 	 * difference, since we're passing in all zeroes anyway.
    645 	 */
    646 	memset(&ehdr, 0, sizeof(ehdr));
    647 	ksyms_addsyms_explicit(&ehdr, symtab, symsize, strtab, strsize);
    648 
    649 	return 0;
    650 }
    651 
    652 static int
    653 rump_sysproxy_local(int num, void *arg, uint8_t *data, size_t dlen,
    654 	register_t *retval)
    655 {
    656 	struct lwp *l;
    657 	struct sysent *callp;
    658 	int rv;
    659 
    660 	if (__predict_false(num >= SYS_NSYSENT))
    661 		return ENOSYS;
    662 
    663 	callp = rump_sysent + num;
    664 	rump_schedule();
    665 	l = curlwp;
    666 	rv = callp->sy_call(l, (void *)data, retval);
    667 	rump_unschedule();
    668 
    669 	return rv;
    670 }
    671 
    672 int
    673 rump_boot_gethowto()
    674 {
    675 
    676 	return boothowto;
    677 }
    678 
    679 void
    680 rump_boot_sethowto(int howto)
    681 {
    682 
    683 	boothowto = howto;
    684 }
    685 
    686 rump_sysproxy_t rump_sysproxy = rump_sysproxy_local;
    687 void *rump_sysproxy_arg;
    688 
    689 /*
    690  * This whole syscall-via-rpc is still taking form.  For example, it
    691  * may be necessary to set syscalls individually instead of lobbing
    692  * them all to the same place.  So don't think this interface is
    693  * set in stone.
    694  */
    695 int
    696 rump_sysproxy_set(rump_sysproxy_t proxy, void *arg)
    697 {
    698 
    699 	if (rump_sysproxy_arg)
    700 		return EBUSY;
    701 
    702 	rump_sysproxy_arg = arg;
    703 	rump_sysproxy = proxy;
    704 
    705 	return 0;
    706 }
    707 
    708 int
    709 rump_getversion(void)
    710 {
    711 
    712 	return __NetBSD_Version__;
    713 }
    714