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 * 3. 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 * $FreeBSD: src/sys/kern/subr_param.c,v 1.42.2.10 2002/03/09 21:05:47 silby Exp $ 36 */ 37 38 #include "opt_param.h" 39 #include "opt_maxusers.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/malloc.h> 45 #include <sys/sysctl.h> 46 #include <vm/pmap.h> 47 #include <machine/vmparam.h> 48 49 /* 50 * System parameter formulae. 51 */ 52 53 #ifndef HZ 54 #define HZ 100 55 #endif 56 #define NPROC (20 + 16 * maxusers) 57 #ifndef NBUF 58 #define NBUF 0 59 #endif 60 #ifndef MAXFILES 61 #define MAXFILES (maxproc * 16) 62 #endif 63 #ifndef MAXPOSIXLOCKSPERUID 64 #define MAXPOSIXLOCKSPERUID (maxusers * 64) /* Should be a safe value */ 65 #endif 66 67 static int sysctl_kern_vmm_guest(SYSCTL_HANDLER_ARGS); 68 69 int hz; 70 int stathz; 71 int profhz; 72 int ustick; /* tick interval in microseconds */ 73 int nstick; /* tick interval in nanoseconds */ 74 int maxusers; /* base tunable */ 75 int maxproc; /* maximum # of processes */ 76 int maxprocperuid; /* max # of procs per user */ 77 int maxfiles; /* system wide open files limit */ 78 int maxfilesrootres; /* descriptors reserved for root use */ 79 int minfilesperproc; /* per-proc min open files (safety) */ 80 int maxfilesperproc; /* per-proc open files limit */ 81 int maxfilesperuser; /* per-user open files limit */ 82 int maxposixlocksperuid; /* max # POSIX locks per uid */ 83 int ncallout; /* maximum # of timer events */ 84 int mbuf_wait = 32; /* mbuf sleep time in ticks */ 85 long nbuf; 86 long nswbuf; 87 long maxswzone; /* max swmeta KVA storage */ 88 long maxbcache; /* max buffer cache KVA storage */ 89 enum vmm_guest_type vmm_guest = VMM_GUEST_NONE; /* Running as VM guest? */ 90 u_quad_t maxtsiz; /* max text size */ 91 u_quad_t dfldsiz; /* initial data size limit */ 92 u_quad_t maxdsiz; /* max data size */ 93 u_quad_t dflssiz; /* initial stack size limit */ 94 u_quad_t maxssiz; /* max stack size */ 95 u_quad_t sgrowsiz; /* amount to grow stack */ 96 97 SYSCTL_PROC(_kern, OID_AUTO, vmm_guest, CTLFLAG_RD | CTLTYPE_STRING, 98 NULL, 0, sysctl_kern_vmm_guest, "A", 99 "Virtual machine guest type"); 100 101 /* 102 * These have to be allocated somewhere; allocating 103 * them here forces loader errors if this file is omitted 104 * (if they've been externed everywhere else; hah!). 105 */ 106 struct buf *swbuf; 107 108 struct vmm_bname { 109 const char *str; 110 enum vmm_guest_type type; 111 }; 112 113 static struct vmm_bname vmm_bnames[] = { 114 { "QEMU", VMM_GUEST_QEMU }, /* QEMU */ 115 { "Plex86", VMM_GUEST_PLEX86 }, /* Plex86 */ 116 { "Bochs", VMM_GUEST_BOCHS }, /* Bochs */ 117 { "Xen", VMM_GUEST_XEN }, /* Xen */ 118 { "BHYVE", VMM_GUEST_BHYVE }, /* bhyve */ 119 { "Seabios", VMM_GUEST_KVM}, /* KVM */ 120 { NULL, 0 } 121 }; 122 123 static struct vmm_bname vmm_pnames[] = { 124 { "VMware Virtual Platform", VMM_GUEST_VMWARE }, /* VMWare VM */ 125 { "Virtual Machine", VMM_GUEST_VPC }, /* M$ VirtualPC */ 126 { "VirtualBox", VMM_GUEST_VBOX }, /* Sun VirtualBox */ 127 { "Parallels Virtual Platform", VMM_GUEST_PARALLELS }, /* Parallels VM */ 128 { "KVM", VMM_GUEST_KVM }, /* KVM */ 129 { NULL, 0 } 130 }; 131 132 static const char *const vmm_guest_sysctl_names[] = { 133 "none", 134 "qemu", 135 "plex86", 136 "bochs", 137 "xen", 138 "bhyve", 139 "kvm", 140 "vmware", 141 "vpc", 142 "vbox", 143 "parallels", 144 "vkernel", 145 "unknown", 146 NULL 147 }; 148 CTASSERT(NELEM(vmm_guest_sysctl_names) - 1 == VMM_GUEST_LAST); 149 150 /* 151 * Detect known Virtual Machine hosts by inspecting the emulated BIOS. 152 */ 153 enum vmm_guest_type 154 detect_virtual(void) 155 { 156 char *sysenv; 157 int i; 158 159 sysenv = kgetenv("smbios.bios.vendor"); 160 if (sysenv != NULL) { 161 for (i = 0; vmm_bnames[i].str != NULL; i++) 162 if (strcmp(sysenv, vmm_bnames[i].str) == 0) { 163 kfreeenv(sysenv); 164 return (vmm_bnames[i].type); 165 } 166 kfreeenv(sysenv); 167 } 168 sysenv = kgetenv("smbios.system.product"); 169 if (sysenv != NULL) { 170 for (i = 0; vmm_pnames[i].str != NULL; i++) 171 if (strcmp(sysenv, vmm_pnames[i].str) == 0) { 172 kfreeenv(sysenv); 173 return (vmm_pnames[i].type); 174 } 175 kfreeenv(sysenv); 176 } 177 return (VMM_GUEST_NONE); 178 } 179 180 /* 181 * Boot time overrides that are not scaled against main memory 182 */ 183 void 184 init_param1(void) 185 { 186 hz = HZ; 187 TUNABLE_INT_FETCH("kern.hz", &hz); 188 stathz = hz * 128 / 100; 189 profhz = stathz; 190 ustick = 1000000 / hz; 191 nstick = 1000000000 / hz; 192 /* can adjust 30ms in 60s */ 193 ntp_default_tick_delta = howmany(30000000, 60 * hz); 194 195 #ifdef VM_SWZONE_SIZE_MAX 196 maxswzone = VM_SWZONE_SIZE_MAX; 197 #endif 198 TUNABLE_LONG_FETCH("kern.maxswzone", &maxswzone); 199 #ifdef VM_BCACHE_SIZE_MAX 200 maxbcache = VM_BCACHE_SIZE_MAX; 201 #endif 202 TUNABLE_LONG_FETCH("kern.maxbcache", &maxbcache); 203 maxtsiz = MAXTSIZ; 204 TUNABLE_QUAD_FETCH("kern.maxtsiz", &maxtsiz); 205 dfldsiz = DFLDSIZ; 206 TUNABLE_QUAD_FETCH("kern.dfldsiz", &dfldsiz); 207 maxdsiz = MAXDSIZ; 208 TUNABLE_QUAD_FETCH("kern.maxdsiz", &maxdsiz); 209 dflssiz = DFLSSIZ; 210 TUNABLE_QUAD_FETCH("kern.dflssiz", &dflssiz); 211 maxssiz = MAXSSIZ; 212 TUNABLE_QUAD_FETCH("kern.maxssiz", &maxssiz); 213 sgrowsiz = SGROWSIZ; 214 TUNABLE_QUAD_FETCH("kern.sgrowsiz", &sgrowsiz); 215 } 216 217 /* 218 * Boot time overrides that are scaled against main memory 219 */ 220 void 221 init_param2(int physpages) 222 { 223 size_t limsize; 224 225 /* 226 * Calculate manually becaus the VM page queues / system is not set up yet 227 */ 228 limsize = (size_t)physpages * PAGE_SIZE; 229 if (limsize > KvaSize) 230 limsize = KvaSize; 231 limsize /= 1024 * 1024; /* smaller of KVM or physmem in MB */ 232 233 /* Base parameters */ 234 maxusers = MAXUSERS; 235 TUNABLE_INT_FETCH("kern.maxusers", &maxusers); 236 if (maxusers == 0) { 237 maxusers = limsize / 8; /* ~384 per 3G */ 238 if (maxusers < 32) 239 maxusers = 32; 240 /* no upper limit */ 241 } 242 243 /* 244 * The following can be overridden after boot via sysctl. Note: 245 * unless overriden, these macros are ultimately based on maxusers. 246 * 247 * Limit maxproc so that kmap entries cannot be exhausted by 248 * processes. 249 */ 250 maxproc = NPROC; 251 TUNABLE_INT_FETCH("kern.maxproc", &maxproc); 252 if (maxproc < 32) 253 maxproc = 32; 254 if (maxproc > limsize * 21) 255 maxproc = limsize * 21; 256 257 /* 258 * Maximum number of open files 259 */ 260 maxfiles = MAXFILES; 261 TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles); 262 if (maxfiles < 128) 263 maxfiles = 128; 264 265 /* 266 * Limit file descriptors so no single user can exhaust the 267 * system. 268 * 269 * WARNING: Do not set minfilesperproc too high or the user 270 * can exhaust the system with a combination of fork() 271 * and open(). Actual worst case is: 272 * 273 * (minfilesperproc * maxprocperuid) + maxfilesperuser 274 */ 275 maxprocperuid = maxproc / 4; 276 if (maxprocperuid < 128) 277 maxprocperuid = maxproc / 2; 278 minfilesperproc = 8; 279 maxfilesperproc = maxfiles / 4; 280 maxfilesperuser = maxfilesperproc * 2; 281 maxfilesrootres = maxfiles / 20; 282 283 /* 284 * Severe hack to try to prevent pipe() descriptors from 285 * blowing away kernel memory. 286 */ 287 if (KvaSize <= (vm_offset_t)(1536LL * 1024 * 1024) && 288 maxfilesperuser > 20000) { 289 maxfilesperuser = 20000; 290 } 291 292 maxposixlocksperuid = MAXPOSIXLOCKSPERUID; 293 TUNABLE_INT_FETCH("kern.maxposixlocksperuid", &maxposixlocksperuid); 294 295 /* 296 * Unless overriden, NBUF is typically 0 (auto-sized later). 297 */ 298 nbuf = NBUF; 299 TUNABLE_LONG_FETCH("kern.nbuf", &nbuf); 300 301 ncallout = 16 + maxproc + maxfiles; 302 TUNABLE_INT_FETCH("kern.ncallout", &ncallout); 303 } 304 305 /* 306 * Sysctl stringifying handler for kern.vmm_guest. 307 */ 308 static int 309 sysctl_kern_vmm_guest(SYSCTL_HANDLER_ARGS) 310 { 311 return (SYSCTL_OUT(req, vmm_guest_sysctl_names[vmm_guest], 312 strlen(vmm_guest_sysctl_names[vmm_guest]))); 313 } 314