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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 $
38 #include "opt_param.h"
39 #include "opt_maxusers.h"
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>
47 #include <machine/vmparam.h>
50 * System parameter formulae.
56 #define NPROC (20 + 16 * maxusers)
61 #define MAXFILES (maxproc * 16)
63 #ifndef MAXPOSIXLOCKSPERUID
64 #define MAXPOSIXLOCKSPERUID (maxusers * 64) /* Should be a safe value */
67 static int sysctl_kern_vmm_guest(SYSCTL_HANDLER_ARGS);
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 */
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 */
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");
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!).
110 enum vmm_guest_type type;
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 */
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 */
132 static const char *const vmm_guest_sysctl_names[] = {
148 CTASSERT(NELEM(vmm_guest_sysctl_names) - 1 == VMM_GUEST_LAST);
151 * Detect known Virtual Machine hosts by inspecting the emulated BIOS.
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) {
164 return (vmm_bnames[i].type);
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) {
173 return (vmm_pnames[i].type);
177 return (VMM_GUEST_NONE);
181 * Boot time overrides that are not scaled against main memory
187 TUNABLE_INT_FETCH("kern.hz", &hz);
188 stathz = hz * 128 / 100;
190 ustick = 1000000 / hz;
191 nstick = 1000000000 / hz;
192 /* can adjust 30ms in 60s */
193 ntp_default_tick_delta = howmany(30000000, 60 * hz);
195 #ifdef VM_SWZONE_SIZE_MAX
196 maxswzone = VM_SWZONE_SIZE_MAX;
198 TUNABLE_LONG_FETCH("kern.maxswzone", &maxswzone);
199 #ifdef VM_BCACHE_SIZE_MAX
200 maxbcache = VM_BCACHE_SIZE_MAX;
202 TUNABLE_LONG_FETCH("kern.maxbcache", &maxbcache);
204 TUNABLE_QUAD_FETCH("kern.maxtsiz", &maxtsiz);
206 TUNABLE_QUAD_FETCH("kern.dfldsiz", &dfldsiz);
208 TUNABLE_QUAD_FETCH("kern.maxdsiz", &maxdsiz);
210 TUNABLE_QUAD_FETCH("kern.dflssiz", &dflssiz);
212 TUNABLE_QUAD_FETCH("kern.maxssiz", &maxssiz);
214 TUNABLE_QUAD_FETCH("kern.sgrowsiz", &sgrowsiz);
218 * Boot time overrides that are scaled against main memory
221 init_param2(int physpages)
226 * Calculate manually becaus the VM page queues / system is not set up yet
228 limsize = (size_t)physpages * PAGE_SIZE;
229 if (limsize > KvaSize)
231 limsize /= 1024 * 1024; /* smaller of KVM or physmem in MB */
233 /* Base parameters */
235 TUNABLE_INT_FETCH("kern.maxusers", &maxusers);
237 maxusers = limsize / 8; /* ~384 per 3G */
244 * The following can be overridden after boot via sysctl. Note:
245 * unless overriden, these macros are ultimately based on maxusers.
247 * Limit maxproc so that kmap entries cannot be exhausted by
251 TUNABLE_INT_FETCH("kern.maxproc", &maxproc);
254 if (maxproc > limsize * 21)
255 maxproc = limsize * 21;
258 * Maximum number of open files
261 TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles);
266 * Limit file descriptors so no single user can exhaust the
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:
273 * (minfilesperproc * maxprocperuid) + maxfilesperuser
275 maxprocperuid = maxproc / 4;
276 if (maxprocperuid < 128)
277 maxprocperuid = maxproc / 2;
279 maxfilesperproc = maxfiles / 4;
280 maxfilesperuser = maxfilesperproc * 2;
281 maxfilesrootres = maxfiles / 20;
284 * Severe hack to try to prevent pipe() descriptors from
285 * blowing away kernel memory.
287 if (KvaSize <= (vm_offset_t)(1536LL * 1024 * 1024) &&
288 maxfilesperuser > 20000) {
289 maxfilesperuser = 20000;
292 maxposixlocksperuid = MAXPOSIXLOCKSPERUID;
293 TUNABLE_INT_FETCH("kern.maxposixlocksperuid", &maxposixlocksperuid);
296 * Unless overriden, NBUF is typically 0 (auto-sized later).
299 TUNABLE_LONG_FETCH("kern.nbuf", &nbuf);
301 ncallout = 16 + maxproc + maxfiles;
302 TUNABLE_INT_FETCH("kern.ncallout", &ncallout);
306 * Sysctl stringifying handler for kern.vmm_guest.
309 sysctl_kern_vmm_guest(SYSCTL_HANDLER_ARGS)
311 return (SYSCTL_OUT(req, vmm_guest_sysctl_names[vmm_guest],
312 strlen(vmm_guest_sysctl_names[vmm_guest])));