949f834a61
type, use a table to make it easier to add more in the future, if needed.
Add VirtualBox detection to the table ("VBoxVBoxVBox" is the hypervisor
vendor string to look for.) Also add VM_GUEST_VBOX to the VM_GUEST
enumeration to indicate VirtualBox.
Save the CPUID base for the hypervisor entry that we detected. Driver code
may need to know about it in order to obtain additional CPUID features.
Approved by: bryanv, jhb
Differential Revision: https://reviews.freebsd.org/D16305
318 lines
10 KiB
C
318 lines
10 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1980, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)param.c 8.3 (Berkeley) 8/20/94
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_param.h"
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#include "opt_msgbuf.h"
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#include "opt_maxusers.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/buf.h>
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#include <sys/kernel.h>
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#include <sys/limits.h>
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#include <sys/msgbuf.h>
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#include <sys/sysctl.h>
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#include <sys/proc.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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/*
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* System parameter formulae.
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*/
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#ifndef HZ
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# if defined(__mips__) || defined(__arm__)
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# define HZ 100
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# else
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# define HZ 1000
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# endif
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# ifndef HZ_VM
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# define HZ_VM 100
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# endif
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#else
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# ifndef HZ_VM
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# define HZ_VM HZ
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# endif
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#endif
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#define NPROC (20 + 16 * maxusers)
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#ifndef NBUF
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#define NBUF 0
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#endif
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#ifndef MAXFILES
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#define MAXFILES (40 + 32 * maxusers)
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#endif
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static int sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS);
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int hz; /* system clock's frequency */
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int tick; /* usec per tick (1000000 / hz) */
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struct bintime tick_bt; /* bintime per tick (1s / hz) */
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sbintime_t tick_sbt;
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int maxusers; /* base tunable */
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int maxproc; /* maximum # of processes */
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int maxprocperuid; /* max # of procs per user */
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int maxfiles; /* sys. wide open files limit */
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int maxfilesperproc; /* per-proc open files limit */
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int msgbufsize; /* size of kernel message buffer */
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int nbuf;
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int bio_transient_maxcnt;
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int ngroups_max; /* max # groups per process */
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int nswbuf;
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pid_t pid_max = PID_MAX;
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long maxswzone; /* max swmeta KVA storage */
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long maxbcache; /* max buffer cache KVA storage */
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long maxpipekva; /* Limit on pipe KVA */
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int vm_guest = VM_GUEST_NO; /* Running as virtual machine guest? */
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u_long maxtsiz; /* max text size */
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u_long dfldsiz; /* initial data size limit */
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u_long maxdsiz; /* max data size */
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u_long dflssiz; /* initial stack size limit */
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u_long maxssiz; /* max stack size */
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u_long sgrowsiz; /* amount to grow stack */
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SYSCTL_INT(_kern, OID_AUTO, hz, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, &hz, 0,
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"Number of clock ticks per second");
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SYSCTL_INT(_kern, OID_AUTO, nbuf, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, &nbuf, 0,
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"Number of buffers in the buffer cache");
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SYSCTL_INT(_kern, OID_AUTO, nswbuf, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, &nswbuf, 0,
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"Number of swap buffers");
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SYSCTL_INT(_kern, OID_AUTO, msgbufsize, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, &msgbufsize, 0,
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"Size of the kernel message buffer");
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SYSCTL_LONG(_kern, OID_AUTO, maxswzone, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, &maxswzone, 0,
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"Maximum memory for swap metadata");
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SYSCTL_LONG(_kern, OID_AUTO, maxbcache, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, &maxbcache, 0,
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"Maximum value of vfs.maxbufspace");
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SYSCTL_INT(_kern, OID_AUTO, bio_transient_maxcnt, CTLFLAG_RDTUN | CTLFLAG_NOFETCH,
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&bio_transient_maxcnt, 0,
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"Maximum number of transient BIOs mappings");
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SYSCTL_ULONG(_kern, OID_AUTO, maxtsiz, CTLFLAG_RWTUN | CTLFLAG_NOFETCH, &maxtsiz, 0,
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"Maximum text size");
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SYSCTL_ULONG(_kern, OID_AUTO, dfldsiz, CTLFLAG_RWTUN | CTLFLAG_NOFETCH, &dfldsiz, 0,
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"Initial data size limit");
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SYSCTL_ULONG(_kern, OID_AUTO, maxdsiz, CTLFLAG_RWTUN | CTLFLAG_NOFETCH, &maxdsiz, 0,
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"Maximum data size");
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SYSCTL_ULONG(_kern, OID_AUTO, dflssiz, CTLFLAG_RWTUN | CTLFLAG_NOFETCH, &dflssiz, 0,
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"Initial stack size limit");
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SYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RWTUN | CTLFLAG_NOFETCH, &maxssiz, 0,
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"Maximum stack size");
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SYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RWTUN | CTLFLAG_NOFETCH, &sgrowsiz, 0,
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"Amount to grow stack on a stack fault");
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SYSCTL_PROC(_kern, OID_AUTO, vm_guest, CTLFLAG_RD | CTLTYPE_STRING,
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NULL, 0, sysctl_kern_vm_guest, "A",
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"Virtual machine guest detected?");
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/*
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* The elements of this array are ordered based upon the values of the
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* corresponding enum VM_GUEST members.
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*/
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static const char *const vm_guest_sysctl_names[] = {
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"none",
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"generic",
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"xen",
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"hv",
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"vmware",
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"kvm",
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"bhyve",
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"vbox",
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NULL
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};
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CTASSERT(nitems(vm_guest_sysctl_names) - 1 == VM_LAST);
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/*
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* Boot time overrides that are not scaled against main memory
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*/
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void
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init_param1(void)
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{
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#if !defined(__mips__) && !defined(__arm64__) && !defined(__sparc64__)
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TUNABLE_INT_FETCH("kern.kstack_pages", &kstack_pages);
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#endif
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hz = -1;
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TUNABLE_INT_FETCH("kern.hz", &hz);
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if (hz == -1)
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hz = vm_guest > VM_GUEST_NO ? HZ_VM : HZ;
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tick = 1000000 / hz;
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tick_sbt = SBT_1S / hz;
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tick_bt = sbttobt(tick_sbt);
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/*
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* Arrange for ticks to wrap 10 minutes after boot to help catch
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* sign problems sooner.
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*/
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ticks = INT_MAX - (hz * 10 * 60);
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#ifdef VM_SWZONE_SIZE_MAX
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maxswzone = VM_SWZONE_SIZE_MAX;
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#endif
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TUNABLE_LONG_FETCH("kern.maxswzone", &maxswzone);
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#ifdef VM_BCACHE_SIZE_MAX
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maxbcache = VM_BCACHE_SIZE_MAX;
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#endif
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TUNABLE_LONG_FETCH("kern.maxbcache", &maxbcache);
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msgbufsize = MSGBUF_SIZE;
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TUNABLE_INT_FETCH("kern.msgbufsize", &msgbufsize);
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maxtsiz = MAXTSIZ;
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TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz);
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dfldsiz = DFLDSIZ;
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TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz);
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maxdsiz = MAXDSIZ;
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TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz);
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dflssiz = DFLSSIZ;
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TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz);
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maxssiz = MAXSSIZ;
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TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz);
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sgrowsiz = SGROWSIZ;
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TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz);
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/*
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* Let the administrator set {NGROUPS_MAX}, but disallow values
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* less than NGROUPS_MAX which would violate POSIX.1-2008 or
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* greater than INT_MAX-1 which would result in overflow.
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*/
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ngroups_max = NGROUPS_MAX;
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TUNABLE_INT_FETCH("kern.ngroups", &ngroups_max);
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if (ngroups_max < NGROUPS_MAX)
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ngroups_max = NGROUPS_MAX;
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/*
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* Only allow to lower the maximal pid.
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* Prevent setting up a non-bootable system if pid_max is too low.
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*/
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TUNABLE_INT_FETCH("kern.pid_max", &pid_max);
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if (pid_max > PID_MAX)
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pid_max = PID_MAX;
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else if (pid_max < 300)
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pid_max = 300;
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TUNABLE_INT_FETCH("vfs.unmapped_buf_allowed", &unmapped_buf_allowed);
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}
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/*
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* Boot time overrides that are scaled against main memory
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*/
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void
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init_param2(long physpages)
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{
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/* Base parameters */
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maxusers = MAXUSERS;
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TUNABLE_INT_FETCH("kern.maxusers", &maxusers);
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if (maxusers == 0) {
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maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE);
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if (maxusers < 32)
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maxusers = 32;
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#ifdef VM_MAX_AUTOTUNE_MAXUSERS
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if (maxusers > VM_MAX_AUTOTUNE_MAXUSERS)
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maxusers = VM_MAX_AUTOTUNE_MAXUSERS;
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#endif
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/*
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* Scales down the function in which maxusers grows once
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* we hit 384.
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*/
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if (maxusers > 384)
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maxusers = 384 + ((maxusers - 384) / 8);
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}
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/*
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* The following can be overridden after boot via sysctl. Note:
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* unless overriden, these macros are ultimately based on maxusers.
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* Limit maxproc so that kmap entries cannot be exhausted by
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* processes.
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*/
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maxproc = NPROC;
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TUNABLE_INT_FETCH("kern.maxproc", &maxproc);
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if (maxproc > (physpages / 12))
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maxproc = physpages / 12;
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if (maxproc > pid_max)
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maxproc = pid_max;
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maxprocperuid = (maxproc * 9) / 10;
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/*
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* The default limit for maxfiles is 1/12 of the number of
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* physical page but not less than 16 times maxusers.
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* At most it can be 1/6 the number of physical pages.
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*/
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maxfiles = imax(MAXFILES, physpages / 8);
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TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles);
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if (maxfiles > (physpages / 4))
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maxfiles = physpages / 4;
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maxfilesperproc = (maxfiles / 10) * 9;
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TUNABLE_INT_FETCH("kern.maxfilesperproc", &maxfilesperproc);
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/*
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* Cannot be changed after boot.
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*/
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nbuf = NBUF;
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TUNABLE_INT_FETCH("kern.nbuf", &nbuf);
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TUNABLE_INT_FETCH("kern.bio_transient_maxcnt", &bio_transient_maxcnt);
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/*
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* Physical buffers are pre-allocated buffers (struct buf) that
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* are used as temporary holders for I/O, such as paging I/O.
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*/
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TUNABLE_INT_FETCH("kern.nswbuf", &nswbuf);
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/*
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* The default for maxpipekva is min(1/64 of the kernel address space,
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* max(1/64 of main memory, 512KB)). See sys_pipe.c for more details.
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*/
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maxpipekva = (physpages / 64) * PAGE_SIZE;
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TUNABLE_LONG_FETCH("kern.ipc.maxpipekva", &maxpipekva);
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if (maxpipekva < 512 * 1024)
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maxpipekva = 512 * 1024;
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if (maxpipekva > (VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) / 64)
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maxpipekva = (VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) /
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64;
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}
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/*
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* Sysctl stringifying handler for kern.vm_guest.
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*/
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static int
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sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS)
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{
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return (SYSCTL_OUT_STR(req, vm_guest_sysctl_names[vm_guest]));
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}
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