1/*- 2 * Copyright (c) 1980, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)param.c 8.3 (Berkeley) 8/20/94 35 */ 36 37#include <sys/cdefs.h>
| 1/*- 2 * Copyright (c) 1980, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)param.c 8.3 (Berkeley) 8/20/94 35 */ 36 37#include <sys/cdefs.h>
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97pid_t pid_max = PID_MAX; 98long maxswzone; /* max swmeta KVA storage */ 99long maxbcache; /* max buffer cache KVA storage */ 100long maxpipekva; /* Limit on pipe KVA */ 101int vm_guest; /* Running as virtual machine guest? */ 102u_long maxtsiz; /* max text size */ 103u_long dfldsiz; /* initial data size limit */ 104u_long maxdsiz; /* max data size */ 105u_long dflssiz; /* initial stack size limit */ 106u_long maxssiz; /* max stack size */ 107u_long sgrowsiz; /* amount to grow stack */ 108 109SYSCTL_INT(_kern, OID_AUTO, hz, CTLFLAG_RDTUN, &hz, 0, 110 "Number of clock ticks per second"); 111SYSCTL_INT(_kern, OID_AUTO, ncallout, CTLFLAG_RDTUN, &ncallout, 0, 112 "Number of pre-allocated timer events"); 113SYSCTL_INT(_kern, OID_AUTO, nbuf, CTLFLAG_RDTUN, &nbuf, 0, 114 "Number of buffers in the buffer cache"); 115SYSCTL_INT(_kern, OID_AUTO, nswbuf, CTLFLAG_RDTUN, &nswbuf, 0, 116 "Number of swap buffers"); 117SYSCTL_INT(_kern, OID_AUTO, msgbufsize, CTLFLAG_RDTUN, &msgbufsize, 0, 118 "Size of the kernel message buffer"); 119SYSCTL_LONG(_kern, OID_AUTO, maxswzone, CTLFLAG_RDTUN, &maxswzone, 0, 120 "Maximum memory for swap metadata"); 121SYSCTL_LONG(_kern, OID_AUTO, maxbcache, CTLFLAG_RDTUN, &maxbcache, 0, 122 "Maximum value of vfs.maxbufspace"); 123SYSCTL_ULONG(_kern, OID_AUTO, maxtsiz, CTLFLAG_RW | CTLFLAG_TUN, &maxtsiz, 0, 124 "Maximum text size"); 125SYSCTL_ULONG(_kern, OID_AUTO, dfldsiz, CTLFLAG_RW | CTLFLAG_TUN, &dfldsiz, 0, 126 "Initial data size limit"); 127SYSCTL_ULONG(_kern, OID_AUTO, maxdsiz, CTLFLAG_RW | CTLFLAG_TUN, &maxdsiz, 0, 128 "Maximum data size"); 129SYSCTL_ULONG(_kern, OID_AUTO, dflssiz, CTLFLAG_RW | CTLFLAG_TUN, &dflssiz, 0, 130 "Initial stack size limit"); 131SYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RW | CTLFLAG_TUN, &maxssiz, 0, 132 "Maximum stack size"); 133SYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RW | CTLFLAG_TUN, &sgrowsiz, 0, 134 "Amount to grow stack on a stack fault"); 135SYSCTL_PROC(_kern, OID_AUTO, vm_guest, CTLFLAG_RD | CTLTYPE_STRING, 136 NULL, 0, sysctl_kern_vm_guest, "A", 137 "Virtual machine guest detected? (none|generic|xen)"); 138 139/* 140 * These have to be allocated somewhere; allocating 141 * them here forces loader errors if this file is omitted 142 * (if they've been externed everywhere else; hah!). 143 */ 144struct buf *swbuf; 145 146/* 147 * The elements of this array are ordered based upon the values of the 148 * corresponding enum VM_GUEST members. 149 */ 150static const char *const vm_guest_sysctl_names[] = { 151 "none", 152 "generic", 153 "xen", 154 NULL 155}; 156 157#ifndef XEN 158static const char *const vm_bnames[] = { 159 "QEMU", /* QEMU */ 160 "Plex86", /* Plex86 */ 161 "Bochs", /* Bochs */ 162 "Xen", /* Xen */ 163 "BHYVE", /* bhyve */ 164 "Seabios", /* KVM */ 165 NULL 166}; 167 168static const char *const vm_pnames[] = { 169 "VMware Virtual Platform", /* VMWare VM */ 170 "Virtual Machine", /* Microsoft VirtualPC */ 171 "VirtualBox", /* Sun xVM VirtualBox */ 172 "Parallels Virtual Platform", /* Parallels VM */ 173 "KVM", /* KVM */ 174 NULL 175}; 176 177 178/* 179 * Detect known Virtual Machine hosts by inspecting the emulated BIOS. 180 */ 181static enum VM_GUEST 182detect_virtual(void) 183{ 184 char *sysenv; 185 int i; 186 187 sysenv = getenv("smbios.bios.vendor"); 188 if (sysenv != NULL) { 189 for (i = 0; vm_bnames[i] != NULL; i++) 190 if (strcmp(sysenv, vm_bnames[i]) == 0) { 191 freeenv(sysenv); 192 return (VM_GUEST_VM); 193 } 194 freeenv(sysenv); 195 } 196 sysenv = getenv("smbios.system.product"); 197 if (sysenv != NULL) { 198 for (i = 0; vm_pnames[i] != NULL; i++) 199 if (strcmp(sysenv, vm_pnames[i]) == 0) { 200 freeenv(sysenv); 201 return (VM_GUEST_VM); 202 } 203 freeenv(sysenv); 204 } 205 return (VM_GUEST_NO); 206} 207#endif 208 209/* 210 * Boot time overrides that are not scaled against main memory 211 */ 212void 213init_param1(void) 214{ 215#ifndef XEN 216 vm_guest = detect_virtual(); 217#else 218 vm_guest = VM_GUEST_XEN; 219#endif 220 hz = -1; 221 TUNABLE_INT_FETCH("kern.hz", &hz); 222 if (hz == -1) 223 hz = vm_guest > VM_GUEST_NO ? HZ_VM : HZ; 224 tick = 1000000 / hz; 225 226#ifdef VM_SWZONE_SIZE_MAX 227 maxswzone = VM_SWZONE_SIZE_MAX; 228#endif 229 TUNABLE_LONG_FETCH("kern.maxswzone", &maxswzone); 230#ifdef VM_BCACHE_SIZE_MAX 231 maxbcache = VM_BCACHE_SIZE_MAX; 232#endif 233 TUNABLE_LONG_FETCH("kern.maxbcache", &maxbcache); 234 msgbufsize = MSGBUF_SIZE; 235 TUNABLE_INT_FETCH("kern.msgbufsize", &msgbufsize); 236 237 maxtsiz = MAXTSIZ; 238 TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz); 239 dfldsiz = DFLDSIZ; 240 TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz); 241 maxdsiz = MAXDSIZ; 242 TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz); 243 dflssiz = DFLSSIZ; 244 TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz); 245 maxssiz = MAXSSIZ; 246 TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz); 247 sgrowsiz = SGROWSIZ; 248 TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz); 249 250 /* 251 * Let the administrator set {NGROUPS_MAX}, but disallow values 252 * less than NGROUPS_MAX which would violate POSIX.1-2008 or 253 * greater than INT_MAX-1 which would result in overflow. 254 */ 255 ngroups_max = NGROUPS_MAX; 256 TUNABLE_INT_FETCH("kern.ngroups", &ngroups_max); 257 if (ngroups_max < NGROUPS_MAX) 258 ngroups_max = NGROUPS_MAX; 259 260 /* 261 * Only allow to lower the maximal pid. 262 * Prevent setting up a non-bootable system if pid_max is too low. 263 */ 264 TUNABLE_INT_FETCH("kern.pid_max", &pid_max); 265 if (pid_max > PID_MAX) 266 pid_max = PID_MAX; 267 else if (pid_max < 300) 268 pid_max = 300; 269} 270 271/* 272 * Boot time overrides that are scaled against main memory 273 */ 274void 275init_param2(long physpages) 276{
| 96pid_t pid_max = PID_MAX; 97long maxswzone; /* max swmeta KVA storage */ 98long maxbcache; /* max buffer cache KVA storage */ 99long maxpipekva; /* Limit on pipe KVA */ 100int vm_guest; /* Running as virtual machine guest? */ 101u_long maxtsiz; /* max text size */ 102u_long dfldsiz; /* initial data size limit */ 103u_long maxdsiz; /* max data size */ 104u_long dflssiz; /* initial stack size limit */ 105u_long maxssiz; /* max stack size */ 106u_long sgrowsiz; /* amount to grow stack */ 107 108SYSCTL_INT(_kern, OID_AUTO, hz, CTLFLAG_RDTUN, &hz, 0, 109 "Number of clock ticks per second"); 110SYSCTL_INT(_kern, OID_AUTO, ncallout, CTLFLAG_RDTUN, &ncallout, 0, 111 "Number of pre-allocated timer events"); 112SYSCTL_INT(_kern, OID_AUTO, nbuf, CTLFLAG_RDTUN, &nbuf, 0, 113 "Number of buffers in the buffer cache"); 114SYSCTL_INT(_kern, OID_AUTO, nswbuf, CTLFLAG_RDTUN, &nswbuf, 0, 115 "Number of swap buffers"); 116SYSCTL_INT(_kern, OID_AUTO, msgbufsize, CTLFLAG_RDTUN, &msgbufsize, 0, 117 "Size of the kernel message buffer"); 118SYSCTL_LONG(_kern, OID_AUTO, maxswzone, CTLFLAG_RDTUN, &maxswzone, 0, 119 "Maximum memory for swap metadata"); 120SYSCTL_LONG(_kern, OID_AUTO, maxbcache, CTLFLAG_RDTUN, &maxbcache, 0, 121 "Maximum value of vfs.maxbufspace"); 122SYSCTL_ULONG(_kern, OID_AUTO, maxtsiz, CTLFLAG_RW | CTLFLAG_TUN, &maxtsiz, 0, 123 "Maximum text size"); 124SYSCTL_ULONG(_kern, OID_AUTO, dfldsiz, CTLFLAG_RW | CTLFLAG_TUN, &dfldsiz, 0, 125 "Initial data size limit"); 126SYSCTL_ULONG(_kern, OID_AUTO, maxdsiz, CTLFLAG_RW | CTLFLAG_TUN, &maxdsiz, 0, 127 "Maximum data size"); 128SYSCTL_ULONG(_kern, OID_AUTO, dflssiz, CTLFLAG_RW | CTLFLAG_TUN, &dflssiz, 0, 129 "Initial stack size limit"); 130SYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RW | CTLFLAG_TUN, &maxssiz, 0, 131 "Maximum stack size"); 132SYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RW | CTLFLAG_TUN, &sgrowsiz, 0, 133 "Amount to grow stack on a stack fault"); 134SYSCTL_PROC(_kern, OID_AUTO, vm_guest, CTLFLAG_RD | CTLTYPE_STRING, 135 NULL, 0, sysctl_kern_vm_guest, "A", 136 "Virtual machine guest detected? (none|generic|xen)"); 137 138/* 139 * These have to be allocated somewhere; allocating 140 * them here forces loader errors if this file is omitted 141 * (if they've been externed everywhere else; hah!). 142 */ 143struct buf *swbuf; 144 145/* 146 * The elements of this array are ordered based upon the values of the 147 * corresponding enum VM_GUEST members. 148 */ 149static const char *const vm_guest_sysctl_names[] = { 150 "none", 151 "generic", 152 "xen", 153 NULL 154}; 155 156#ifndef XEN 157static const char *const vm_bnames[] = { 158 "QEMU", /* QEMU */ 159 "Plex86", /* Plex86 */ 160 "Bochs", /* Bochs */ 161 "Xen", /* Xen */ 162 "BHYVE", /* bhyve */ 163 "Seabios", /* KVM */ 164 NULL 165}; 166 167static const char *const vm_pnames[] = { 168 "VMware Virtual Platform", /* VMWare VM */ 169 "Virtual Machine", /* Microsoft VirtualPC */ 170 "VirtualBox", /* Sun xVM VirtualBox */ 171 "Parallels Virtual Platform", /* Parallels VM */ 172 "KVM", /* KVM */ 173 NULL 174}; 175 176 177/* 178 * Detect known Virtual Machine hosts by inspecting the emulated BIOS. 179 */ 180static enum VM_GUEST 181detect_virtual(void) 182{ 183 char *sysenv; 184 int i; 185 186 sysenv = getenv("smbios.bios.vendor"); 187 if (sysenv != NULL) { 188 for (i = 0; vm_bnames[i] != NULL; i++) 189 if (strcmp(sysenv, vm_bnames[i]) == 0) { 190 freeenv(sysenv); 191 return (VM_GUEST_VM); 192 } 193 freeenv(sysenv); 194 } 195 sysenv = getenv("smbios.system.product"); 196 if (sysenv != NULL) { 197 for (i = 0; vm_pnames[i] != NULL; i++) 198 if (strcmp(sysenv, vm_pnames[i]) == 0) { 199 freeenv(sysenv); 200 return (VM_GUEST_VM); 201 } 202 freeenv(sysenv); 203 } 204 return (VM_GUEST_NO); 205} 206#endif 207 208/* 209 * Boot time overrides that are not scaled against main memory 210 */ 211void 212init_param1(void) 213{ 214#ifndef XEN 215 vm_guest = detect_virtual(); 216#else 217 vm_guest = VM_GUEST_XEN; 218#endif 219 hz = -1; 220 TUNABLE_INT_FETCH("kern.hz", &hz); 221 if (hz == -1) 222 hz = vm_guest > VM_GUEST_NO ? HZ_VM : HZ; 223 tick = 1000000 / hz; 224 225#ifdef VM_SWZONE_SIZE_MAX 226 maxswzone = VM_SWZONE_SIZE_MAX; 227#endif 228 TUNABLE_LONG_FETCH("kern.maxswzone", &maxswzone); 229#ifdef VM_BCACHE_SIZE_MAX 230 maxbcache = VM_BCACHE_SIZE_MAX; 231#endif 232 TUNABLE_LONG_FETCH("kern.maxbcache", &maxbcache); 233 msgbufsize = MSGBUF_SIZE; 234 TUNABLE_INT_FETCH("kern.msgbufsize", &msgbufsize); 235 236 maxtsiz = MAXTSIZ; 237 TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz); 238 dfldsiz = DFLDSIZ; 239 TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz); 240 maxdsiz = MAXDSIZ; 241 TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz); 242 dflssiz = DFLSSIZ; 243 TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz); 244 maxssiz = MAXSSIZ; 245 TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz); 246 sgrowsiz = SGROWSIZ; 247 TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz); 248 249 /* 250 * Let the administrator set {NGROUPS_MAX}, but disallow values 251 * less than NGROUPS_MAX which would violate POSIX.1-2008 or 252 * greater than INT_MAX-1 which would result in overflow. 253 */ 254 ngroups_max = NGROUPS_MAX; 255 TUNABLE_INT_FETCH("kern.ngroups", &ngroups_max); 256 if (ngroups_max < NGROUPS_MAX) 257 ngroups_max = NGROUPS_MAX; 258 259 /* 260 * Only allow to lower the maximal pid. 261 * Prevent setting up a non-bootable system if pid_max is too low. 262 */ 263 TUNABLE_INT_FETCH("kern.pid_max", &pid_max); 264 if (pid_max > PID_MAX) 265 pid_max = PID_MAX; 266 else if (pid_max < 300) 267 pid_max = 300; 268} 269 270/* 271 * Boot time overrides that are scaled against main memory 272 */ 273void 274init_param2(long physpages) 275{
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