sysproxy.c revision 1.4.20.2 1 /* $NetBSD: sysproxy.c,v 1.4.20.2 2020/04/13 08:05:18 martin Exp $ */
2
3 /*
4 * Copyright (c) 2010, 2011 Antti Kantee. All Rights Reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
16 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 __KERNEL_RCSID(0, "$NetBSD: sysproxy.c,v 1.4.20.2 2020/04/13 08:05:18 martin Exp $");
30
31 #include <sys/param.h>
32 #include <sys/filedesc.h>
33 #include <sys/kmem.h>
34 #include <sys/syscall.h>
35 #include <sys/syscallvar.h>
36 #include <sys/systm.h>
37 #include <sys/xcall.h>
38 #include <sys/lockdebug.h>
39 #include <sys/psref.h>
40
41 #define _RUMP_SYSPROXY
42 #include <rump/rumpuser.h>
43
44 #include <rump-sys/kern.h>
45
46 int
47 rump_init_server(const char *url)
48 {
49
50 return rumpuser_sp_init(url, ostype, osrelease, MACHINE);
51 }
52
53 static pid_t
54 hyp_getpid(void)
55 {
56
57 return curproc->p_pid;
58 }
59
60 static int
61 hyp_syscall(int num, void *arg, long *retval)
62 {
63 register_t regrv[2] = {0, 0};
64 struct lwp *l;
65 struct sysent *callp;
66 int rv;
67
68 if (__predict_false(num >= SYS_NSYSENT))
69 return ENOSYS;
70
71 /* XXX: always uses native syscall vector */
72 callp = rump_sysent + num;
73 l = curlwp;
74 rv = sy_invoke(callp, l, (void *)arg, regrv, num);
75 retval[0] = regrv[0];
76 retval[1] = regrv[1];
77
78 /* Sanity checks (from mi_userret) */
79 LOCKDEBUG_BARRIER(NULL, 0);
80 KASSERT(l->l_nopreempt == 0);
81 PSREF_DEBUG_BARRIER();
82 KASSERT(l->l_psrefs == 0);
83
84 return rv;
85 }
86
87 static struct pmap remotepmap;
88
89 static int
90 hyp_rfork(void *priv, int flags, const char *comm)
91 {
92 struct rump_spctl *spctl;
93 struct vmspace *vm;
94 struct proc *p;
95 struct lwp *l;
96 int error;
97 bool initfds;
98
99 /*
100 * If we are forking off of pid 1, initialize file descriptors.
101 */
102 l = curlwp;
103 if (l->l_proc->p_pid == 1) {
104 KASSERT(flags == RUMP_RFFD_CLEAR);
105 initfds = true;
106 } else {
107 initfds = false;
108 }
109
110 /*
111 * Since it's a proxy proc, we create a vmspace for it.
112 */
113 spctl = kmem_zalloc(sizeof(*spctl), KM_SLEEP);
114 vm = &spctl->spctl_vm;
115 uvmspace_init(vm, &remotepmap, 0, 0, false);
116 spctl->spctl = priv;
117
118 if ((error = rump_lwproc_rfork_vmspace(vm, flags)) != 0) {
119 kmem_free(vm, sizeof(*vm));
120 return error;
121 }
122
123 /*
124 * We forked in this routine, so cannot use curlwp (const)
125 */
126 l = rump_lwproc_curlwp();
127 p = l->l_proc;
128
129 if (comm)
130 strlcpy(p->p_comm, comm, sizeof(p->p_comm));
131 if (initfds)
132 rump_consdev_init();
133
134 return 0;
135 }
136
137 /*
138 * Order all lwps in a process to exit. does *not* wait for them to drain.
139 */
140 static void
141 hyp_lwpexit(void)
142 {
143 struct proc *p = curproc;
144 struct lwp *l;
145
146 mutex_enter(p->p_lock);
147 /*
148 * First pass: mark all lwps in the process with LW_RUMP_QEXIT
149 * so that they know they should exit.
150 */
151 LIST_FOREACH(l, &p->p_lwps, l_sibling) {
152 if (l == curlwp)
153 continue;
154 l->l_flag |= LW_RUMP_QEXIT;
155 }
156 mutex_exit(p->p_lock);
157
158 /*
159 * Next, make sure everyone on all CPUs sees our status
160 * update. This keeps threads inside cv_wait() and makes
161 * sure we don't access a stale cv pointer later when
162 * we wake up the threads.
163 */
164
165 xc_barrier(0);
166
167 /*
168 * Ok, all lwps are either:
169 * 1) not in the cv code
170 * 2) sleeping on l->l_private
171 * 3) sleeping on p->p_waitcv
172 *
173 * Either way, l_private is stable until we set PS_RUMP_LWPEXIT
174 * in p->p_sflag.
175 */
176
177 mutex_enter(p->p_lock);
178 LIST_FOREACH(l, &p->p_lwps, l_sibling) {
179 if (l->l_private)
180 cv_broadcast(l->l_private);
181 }
182 p->p_sflag |= PS_RUMP_LWPEXIT;
183 cv_broadcast(&p->p_waitcv);
184 mutex_exit(p->p_lock);
185 }
186
187 /*
188 * Notify process that all threads have been drained and exec is complete.
189 */
190 static void
191 hyp_execnotify(const char *comm)
192 {
193 struct proc *p = curproc;
194
195 fd_closeexec();
196 mutex_enter(p->p_lock);
197 KASSERT(p->p_nlwps == 1 && p->p_sflag & PS_RUMP_LWPEXIT);
198 p->p_sflag &= ~PS_RUMP_LWPEXIT;
199 mutex_exit(p->p_lock);
200 strlcpy(p->p_comm, comm, sizeof(p->p_comm));
201 }
202
203 /*
204 * Initialize interface pointers since component is present.
205 */
206 RUMP_COMPONENT(RUMP_COMPONENT_KERN)
207 {
208
209 rump_sysproxy_ops.rspo_copyin = rumpuser_sp_copyin;
210 rump_sysproxy_ops.rspo_copyinstr = rumpuser_sp_copyinstr;
211 rump_sysproxy_ops.rspo_copyout = rumpuser_sp_copyout;
212 rump_sysproxy_ops.rspo_copyoutstr = rumpuser_sp_copyoutstr;
213 rump_sysproxy_ops.rspo_anonmmap = rumpuser_sp_anonmmap;
214 rump_sysproxy_ops.rspo_raise = rumpuser_sp_raise;
215 rump_sysproxy_ops.rspo_fini = rumpuser_sp_fini;
216
217 rump_sysproxy_ops.rspo_hyp_getpid = hyp_getpid;
218 rump_sysproxy_ops.rspo_hyp_syscall = hyp_syscall;
219 rump_sysproxy_ops.rspo_hyp_rfork = hyp_rfork;
220 rump_sysproxy_ops.rspo_hyp_lwpexit = hyp_lwpexit;
221 rump_sysproxy_ops.rspo_hyp_execnotify = hyp_execnotify;
222 }
223