vmm_stat.c revision 270074 
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: stable/10/sys/amd64/vmm/vmm_stat.c 270074 2014-08-17 01:23:52Z grehan $
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: stable/10/sys/amd64/vmm/vmm_stat.c 270074 2014-08-17 01:23:52Z grehan $");
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
55#define	vst_size	((size_t)vst_num_elems * sizeof(uint64_t))
56
57void
58vmm_stat_register(void *arg)
59{
60	struct vmm_stat_type *vst = arg;
61
62	/* We require all stats to identify themselves with a description */
63	if (vst->desc == NULL)
64		return;
65
66	if (vst->scope == VMM_STAT_SCOPE_INTEL && !vmm_is_intel())
67		return;
68
69	if (vst->scope == VMM_STAT_SCOPE_AMD && !vmm_is_amd())
70		return;
71
72	if (vst_num_elems + vst->nelems >= MAX_VMM_STAT_ELEMS) {
73		printf("Cannot accomodate vmm stat type \"%s\"!\n", vst->desc);
74		return;
75	}
76
77	vst->index = vst_num_elems;
78	vst_num_elems += vst->nelems;
79
80	vsttab[vst_num_types++] = vst;
81}
82
83int
84vmm_stat_copy(struct vm *vm, int vcpu, int *num_stats, uint64_t *buf)
85{
86	struct vmm_stat_type *vst;
87	uint64_t *stats;
88	int i;
89
90	if (vcpu < 0 || vcpu >= VM_MAXCPU)
91		return (EINVAL);
92
93	/* Let stats functions update their counters */
94	for (i = 0; i < vst_num_types; i++) {
95		vst = vsttab[i];
96		if (vst->func != NULL)
97			(*vst->func)(vm, vcpu, vst);
98	}
99
100	/* Copy over the stats */
101	stats = vcpu_stats(vm, vcpu);
102	for (i = 0; i < vst_num_elems; i++)
103		buf[i] = stats[i];
104	*num_stats = vst_num_elems;
105	return (0);
106}
107
108void *
109vmm_stat_alloc(void)
110{
111
112	return (malloc(vst_size, M_VMM_STAT, M_WAITOK));
113}
114
115void
116vmm_stat_init(void *vp)
117{
118
119	bzero(vp, vst_size);
120}
121
122void
123vmm_stat_free(void *vp)
124{
125	free(vp, M_VMM_STAT);
126}
127
128int
129vmm_stat_desc_copy(int index, char *buf, int bufsize)
130{
131	int i;
132	struct vmm_stat_type *vst;
133
134	for (i = 0; i < vst_num_types; i++) {
135		vst = vsttab[i];
136		if (index >= vst->index && index < vst->index + vst->nelems) {
137			if (vst->nelems > 1) {
138				snprintf(buf, bufsize, "%s[%d]",
139					 vst->desc, index - vst->index);
140			} else {
141				strlcpy(buf, vst->desc, bufsize);
142			}
143			return (0);	/* found it */
144		}
145	}
146
147	return (EINVAL);
148}
149
150/* global statistics */
151VMM_STAT(VCPU_MIGRATIONS, "vcpu migration across host cpus");
152VMM_STAT(VMEXIT_COUNT, "total number of vm exits");
153VMM_STAT(VMEXIT_EXTINT, "vm exits due to external interrupt");
154VMM_STAT(VMEXIT_HLT, "number of times hlt was intercepted");
155VMM_STAT(VMEXIT_CR_ACCESS, "number of times %cr access was intercepted");
156VMM_STAT(VMEXIT_RDMSR, "number of times rdmsr was intercepted");
157VMM_STAT(VMEXIT_WRMSR, "number of times wrmsr was intercepted");
158VMM_STAT(VMEXIT_MTRAP, "number of monitor trap exits");
159VMM_STAT(VMEXIT_PAUSE, "number of times pause was intercepted");
160VMM_STAT(VMEXIT_INTR_WINDOW, "vm exits due to interrupt window opening");
161VMM_STAT(VMEXIT_NMI_WINDOW, "vm exits due to nmi window opening");
162VMM_STAT(VMEXIT_INOUT, "number of times in/out was intercepted");
163VMM_STAT(VMEXIT_CPUID, "number of times cpuid was intercepted");
164VMM_STAT(VMEXIT_NESTED_FAULT, "vm exits due to nested page fault");
165VMM_STAT(VMEXIT_INST_EMUL, "vm exits for instruction emulation");
166VMM_STAT(VMEXIT_UNKNOWN, "number of vm exits for unknown reason");
167VMM_STAT(VMEXIT_ASTPENDING, "number of times astpending at exit");
168VMM_STAT(VMEXIT_USERSPACE, "number of vm exits handled in userspace");
169VMM_STAT(VMEXIT_RENDEZVOUS, "number of times rendezvous pending at exit");
170VMM_STAT(VMEXIT_EXCEPTION, "number of vm exits due to exceptions");
171