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By popular request, stringify kern.vm_guest sysctl. Now it returns a

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short, self-documenting string describing the detected virtual
environment.

Approved by:	gnn (mentor) (earlier version)
This commit is contained in:
Ivan Voras 2008-12-18 15:34:38 +00:00
parent 0e469db660
commit 3610a2260b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=186286
1 changed files with 27 additions and 3 deletions
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30
sys/kern/subr_param.c
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@ -75,6 +75,8 @@ __FBSDID("$FreeBSD$");
enum VM_GUEST { VM_GUEST_NO, VM_GUEST_VM, VM_GUEST_XEN };
static int sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS);
int hz;
int tick;
int maxusers; /* base tunable */
@ -88,7 +90,7 @@ int nswbuf;
int maxswzone; /* max swmeta KVA storage */
int maxbcache; /* max buffer cache KVA storage */
int maxpipekva; /* Limit on pipe KVA */
int vm_guest; /* Running as virtual machine guest? */
int vm_guest; /* Running as virtual machine guest? */
u_long maxtsiz; /* max text size */
u_long dfldsiz; /* initial data size limit */
u_long maxdsiz; /* max data size */
@ -113,8 +115,9 @@ SYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RDTUN, &maxssiz, 0,
"max stack size");
SYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RDTUN, &sgrowsiz, 0,
"amount to grow stack");
SYSCTL_INT(_kern, OID_AUTO, vm_guest, CTLFLAG_RD, &vm_guest, 0,
"Running under a virtual machine?");
SYSCTL_PROC(_kern, OID_AUTO, vm_guest, CTLFLAG_RD | CTLTYPE_STRING,
NULL, 0, sysctl_kern_vm_guest, "A",
"Virtual machine detected? (none|generic|xen)");
/*
* These have to be allocated somewhere; allocating
@ -138,6 +141,17 @@ static const char *const vm_pnames[] = {
NULL
};
static const char *const vm_guest_sysctl_names[] = {
"none",
"generic",
"xen",
NULL
};
/*
* Detect known Virtual Machine hosts by inspecting the emulated BIOS.
*/
static enum VM_GUEST
detect_virtual(void)
{
@ -266,3 +280,13 @@ init_param3(long kmempages)
maxpipekva = 512 * 1024;
TUNABLE_INT_FETCH("kern.ipc.maxpipekva", &maxpipekva);
}
/*
* Sysctl stringiying handler for kern.vm_guest.
*/
static int
sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS)
{
return (SYSCTL_OUT(req, vm_guest_sysctl_names[vm_guest],
strlen(vm_guest_sysctl_names[vm_guest])));
}