ea235a1449
the virtualization detection successfully disabling the clflush instruction. This fixes insta-panics for XEN hvm users when the hw.clflush_disable tunable is -1 or 0 (-1 by default). Discussed with: jhb
317 lines
9.0 KiB
C
317 lines
9.0 KiB
C
/*-
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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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* 4. 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_maxusers.h"
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#include <sys/limits.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <vm/vm_param.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 (maxproc * 2)
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#endif
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static int sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS);
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int hz;
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int tick;
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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 ncallout; /* maximum # of timer events */
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int nbuf;
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int ngroups_max; /* max # groups per process */
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int nswbuf;
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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; /* 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, &hz, 0,
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"Number of clock ticks per second");
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SYSCTL_INT(_kern, OID_AUTO, ncallout, CTLFLAG_RDTUN, &ncallout, 0,
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"Number of pre-allocated timer events");
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SYSCTL_INT(_kern, OID_AUTO, nbuf, CTLFLAG_RDTUN, &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, &nswbuf, 0,
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"Number of swap buffers");
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SYSCTL_LONG(_kern, OID_AUTO, maxswzone, CTLFLAG_RDTUN, &maxswzone, 0,
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"Maximum memory for swap metadata");
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SYSCTL_LONG(_kern, OID_AUTO, maxbcache, CTLFLAG_RDTUN, &maxbcache, 0,
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"Maximum value of vfs.maxbufspace");
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SYSCTL_ULONG(_kern, OID_AUTO, maxtsiz, CTLFLAG_RDTUN, &maxtsiz, 0,
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"Maximum text size");
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SYSCTL_ULONG(_kern, OID_AUTO, dfldsiz, CTLFLAG_RDTUN, &dfldsiz, 0,
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"Initial data size limit");
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SYSCTL_ULONG(_kern, OID_AUTO, maxdsiz, CTLFLAG_RDTUN, &maxdsiz, 0,
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"Maximum data size");
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SYSCTL_ULONG(_kern, OID_AUTO, dflssiz, CTLFLAG_RDTUN, &dflssiz, 0,
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"Initial stack size limit");
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SYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RDTUN, &maxssiz, 0,
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"Maximum stack size");
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SYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RDTUN, &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? (none|generic|xen)");
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/*
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* These have to be allocated somewhere; allocating
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* them here forces loader errors if this file is omitted
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* (if they've been externed everywhere else; hah!).
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*/
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struct buf *swbuf;
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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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NULL
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};
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#ifndef XEN
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static const char *const vm_bnames[] = {
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"QEMU", /* QEMU */
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"Plex86", /* Plex86 */
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"Bochs", /* Bochs */
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"Xen", /* Xen */
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NULL
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};
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static const char *const vm_pnames[] = {
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"VMware Virtual Platform", /* VMWare VM */
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"Virtual Machine", /* Microsoft VirtualPC */
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"VirtualBox", /* Sun xVM VirtualBox */
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"Parallels Virtual Platform", /* Parallels VM */
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NULL
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};
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/*
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* Detect known Virtual Machine hosts by inspecting the emulated BIOS.
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*/
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static enum VM_GUEST
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detect_virtual(void)
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{
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char *sysenv;
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int i;
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sysenv = getenv("smbios.bios.vendor");
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if (sysenv != NULL) {
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for (i = 0; vm_bnames[i] != NULL; i++)
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if (strcmp(sysenv, vm_bnames[i]) == 0) {
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freeenv(sysenv);
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return (VM_GUEST_VM);
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}
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freeenv(sysenv);
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}
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sysenv = getenv("smbios.system.product");
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if (sysenv != NULL) {
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for (i = 0; vm_pnames[i] != NULL; i++)
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if (strcmp(sysenv, vm_pnames[i]) == 0) {
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freeenv(sysenv);
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return (VM_GUEST_VM);
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}
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freeenv(sysenv);
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}
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return (VM_GUEST_NO);
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}
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#endif
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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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#ifndef XEN
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vm_guest = detect_virtual();
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#else
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vm_guest = VM_GUEST_XEN;
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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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#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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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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/*
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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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if (maxusers > 384)
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maxusers = 384;
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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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*/
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maxproc = NPROC;
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TUNABLE_INT_FETCH("kern.maxproc", &maxproc);
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/*
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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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if (maxproc > (physpages / 12))
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maxproc = physpages / 12;
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maxfiles = MAXFILES;
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TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles);
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maxprocperuid = (maxproc * 9) / 10;
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maxfilesperproc = (maxfiles * 9) / 10;
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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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ncallout = 16 + maxproc + maxfiles;
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TUNABLE_INT_FETCH("kern.ncallout", &ncallout);
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}
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/*
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* Boot time overrides that are scaled against the kmem map
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*/
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void
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init_param3(long kmempages)
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{
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/*
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* The default for maxpipekva is max(5% of the kmem map, 512KB).
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* See sys_pipe.c for more details.
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*/
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maxpipekva = (kmempages / 20) * PAGE_SIZE;
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if (maxpipekva < 512 * 1024)
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maxpipekva = 512 * 1024;
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TUNABLE_LONG_FETCH("kern.ipc.maxpipekva", &maxpipekva);
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}
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/*
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* Sysctl stringiying 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(req, vm_guest_sysctl_names[vm_guest],
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strlen(vm_guest_sysctl_names[vm_guest])));
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}
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