vmm_stat.c revision 260619 
1/*-
2 * Copyright (c) 2011 NetApp, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/amd64/vmm/vmm_stat.c 260619 2014-01-14 01:55:58Z neel $
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: head/sys/amd64/vmm/vmm_stat.c 260619 2014-01-14 01:55:58Z neel $");
31
32#include <sys/param.h>
33#include <sys/kernel.h>
34#include <sys/systm.h>
35#include <sys/malloc.h>
36#include <sys/smp.h>
37
38#include <machine/vmm.h>
39#include "vmm_util.h"
40#include "vmm_stat.h"
41
42/*
43 * 'vst_num_elems' is the total number of addressable statistic elements
44 * 'vst_num_types' is the number of unique statistic types
45 *
46 * It is always true that 'vst_num_elems' is greater than or equal to
47 * 'vst_num_types'. This is because a stat type may represent more than
48 * one element (for e.g. VMM_STAT_ARRAY).
49 */
50static int vst_num_elems, vst_num_types;
51static struct vmm_stat_type *vsttab[MAX_VMM_STAT_ELEMS];
52
53static MALLOC_DEFINE(M_VMM_STAT, "vmm stat", "vmm stat");
54
55void
56vmm_stat_init(void *arg)
57{
58	struct vmm_stat_type *vst = arg;
59
60	/* We require all stats to identify themselves with a description */
61	if (vst->desc == NULL)
62		return;
63
64	if (vst->scope == VMM_STAT_SCOPE_INTEL && !vmm_is_intel())
65		return;
66
67	if (vst->scope == VMM_STAT_SCOPE_AMD && !vmm_is_amd())
68		return;
69
70	if (vst_num_elems + vst->nelems >= MAX_VMM_STAT_ELEMS) {
71		printf("Cannot accomodate vmm stat type \"%s\"!\n", vst->desc);
72		return;
73	}
74
75	vst->index = vst_num_elems;
76	vst_num_elems += vst->nelems;
77
78	vsttab[vst_num_types++] = vst;
79}
80
81int
82vmm_stat_copy(struct vm *vm, int vcpu, int *num_stats, uint64_t *buf)
83{
84	int i;
85	uint64_t *stats;
86
87	if (vcpu < 0 || vcpu >= VM_MAXCPU)
88		return (EINVAL);
89
90	stats = vcpu_stats(vm, vcpu);
91	for (i = 0; i < vst_num_elems; i++)
92		buf[i] = stats[i];
93	*num_stats = vst_num_elems;
94	return (0);
95}
96
97void *
98vmm_stat_alloc(void)
99{
100	u_long size;
101
102	size = vst_num_elems * sizeof(uint64_t);
103
104	return (malloc(size, M_VMM_STAT, M_ZERO | M_WAITOK));
105}
106
107void
108vmm_stat_free(void *vp)
109{
110	free(vp, M_VMM_STAT);
111}
112
113int
114vmm_stat_desc_copy(int index, char *buf, int bufsize)
115{
116	int i;
117	struct vmm_stat_type *vst;
118
119	for (i = 0; i < vst_num_types; i++) {
120		vst = vsttab[i];
121		if (index >= vst->index && index < vst->index + vst->nelems) {
122			if (vst->nelems > 1) {
123				snprintf(buf, bufsize, "%s[%d]",
124					 vst->desc, index - vst->index);
125			} else {
126				strlcpy(buf, vst->desc, bufsize);
127			}
128			return (0);	/* found it */
129		}
130	}
131
132	return (EINVAL);
133}
134
135/* global statistics */
136VMM_STAT(VCPU_MIGRATIONS, "vcpu migration across host cpus");
137VMM_STAT(VMEXIT_COUNT, "total number of vm exits");
138VMM_STAT(VMEXIT_EXTINT, "vm exits due to external interrupt");
139VMM_STAT(VMEXIT_HLT, "number of times hlt was intercepted");
140VMM_STAT(VMEXIT_CR_ACCESS, "number of times %cr access was intercepted");
141VMM_STAT(VMEXIT_RDMSR, "number of times rdmsr was intercepted");
142VMM_STAT(VMEXIT_WRMSR, "number of times wrmsr was intercepted");
143VMM_STAT(VMEXIT_MTRAP, "number of monitor trap exits");
144VMM_STAT(VMEXIT_PAUSE, "number of times pause was intercepted");
145VMM_STAT(VMEXIT_INTR_WINDOW, "vm exits due to interrupt window opening");
146VMM_STAT(VMEXIT_NMI_WINDOW, "vm exits due to nmi window opening");
147VMM_STAT(VMEXIT_INOUT, "number of times in/out was intercepted");
148VMM_STAT(VMEXIT_CPUID, "number of times cpuid was intercepted");
149VMM_STAT(VMEXIT_EPT_FAULT, "vm exits due to nested page fault");
150VMM_STAT(VMEXIT_UNKNOWN, "number of vm exits for unknown reason");
151VMM_STAT(VMEXIT_ASTPENDING, "number of times astpending at exit");
152VMM_STAT(VMEXIT_USERSPACE, "number of vm exits handled in userspace");
153VMM_STAT(VMEXIT_RENDEZVOUS, "number of times rendezvous pending at exit");
154