vmm_stat.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2011 NetApp, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD: stable/11/sys/amd64/vmm/vmm_stat.c 330897 2018-03-14 03:19:51Z eadler $
29 */
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD: stable/11/sys/amd64/vmm/vmm_stat.c 330897 2018-03-14 03:19:51Z eadler $");
33
34#include <sys/param.h>
35#include <sys/kernel.h>
36#include <sys/systm.h>
37#include <sys/malloc.h>
38
39#include <machine/vmm.h>
40#include "vmm_util.h"
41#include "vmm_stat.h"
42
43/*
44 * 'vst_num_elems' is the total number of addressable statistic elements
45 * 'vst_num_types' is the number of unique statistic types
46 *
47 * It is always true that 'vst_num_elems' is greater than or equal to
48 * 'vst_num_types'. This is because a stat type may represent more than
49 * one element (for e.g. VMM_STAT_ARRAY).
50 */
51static int vst_num_elems, vst_num_types;
52static struct vmm_stat_type *vsttab[MAX_VMM_STAT_ELEMS];
53
54static MALLOC_DEFINE(M_VMM_STAT, "vmm stat", "vmm stat");
55
56#define	vst_size	((size_t)vst_num_elems * sizeof(uint64_t))
57
58void
59vmm_stat_register(void *arg)
60{
61	struct vmm_stat_type *vst = arg;
62
63	/* We require all stats to identify themselves with a description */
64	if (vst->desc == NULL)
65		return;
66
67	if (vst->scope == VMM_STAT_SCOPE_INTEL && !vmm_is_intel())
68		return;
69
70	if (vst->scope == VMM_STAT_SCOPE_AMD && !vmm_is_amd())
71		return;
72
73	if (vst_num_elems + vst->nelems >= MAX_VMM_STAT_ELEMS) {
74		printf("Cannot accommodate vmm stat type \"%s\"!\n", vst->desc);
75		return;
76	}
77
78	vst->index = vst_num_elems;
79	vst_num_elems += vst->nelems;
80
81	vsttab[vst_num_types++] = vst;
82}
83
84int
85vmm_stat_copy(struct vm *vm, int vcpu, int *num_stats, uint64_t *buf)
86{
87	struct vmm_stat_type *vst;
88	uint64_t *stats;
89	int i;
90
91	if (vcpu < 0 || vcpu >= VM_MAXCPU)
92		return (EINVAL);
93
94	/* Let stats functions update their counters */
95	for (i = 0; i < vst_num_types; i++) {
96		vst = vsttab[i];
97		if (vst->func != NULL)
98			(*vst->func)(vm, vcpu, vst);
99	}
100
101	/* Copy over the stats */
102	stats = vcpu_stats(vm, vcpu);
103	for (i = 0; i < vst_num_elems; i++)
104		buf[i] = stats[i];
105	*num_stats = vst_num_elems;
106	return (0);
107}
108
109void *
110vmm_stat_alloc(void)
111{
112
113	return (malloc(vst_size, M_VMM_STAT, M_WAITOK));
114}
115
116void
117vmm_stat_init(void *vp)
118{
119
120	bzero(vp, vst_size);
121}
122
123void
124vmm_stat_free(void *vp)
125{
126	free(vp, M_VMM_STAT);
127}
128
129int
130vmm_stat_desc_copy(int index, char *buf, int bufsize)
131{
132	int i;
133	struct vmm_stat_type *vst;
134
135	for (i = 0; i < vst_num_types; i++) {
136		vst = vsttab[i];
137		if (index >= vst->index && index < vst->index + vst->nelems) {
138			if (vst->nelems > 1) {
139				snprintf(buf, bufsize, "%s[%d]",
140					 vst->desc, index - vst->index);
141			} else {
142				strlcpy(buf, vst->desc, bufsize);
143			}
144			return (0);	/* found it */
145		}
146	}
147
148	return (EINVAL);
149}
150
151/* global statistics */
152VMM_STAT(VCPU_MIGRATIONS, "vcpu migration across host cpus");
153VMM_STAT(VMEXIT_COUNT, "total number of vm exits");
154VMM_STAT(VMEXIT_EXTINT, "vm exits due to external interrupt");
155VMM_STAT(VMEXIT_HLT, "number of times hlt was intercepted");
156VMM_STAT(VMEXIT_CR_ACCESS, "number of times %cr access was intercepted");
157VMM_STAT(VMEXIT_RDMSR, "number of times rdmsr was intercepted");
158VMM_STAT(VMEXIT_WRMSR, "number of times wrmsr was intercepted");
159VMM_STAT(VMEXIT_MTRAP, "number of monitor trap exits");
160VMM_STAT(VMEXIT_PAUSE, "number of times pause was intercepted");
161VMM_STAT(VMEXIT_INTR_WINDOW, "vm exits due to interrupt window opening");
162VMM_STAT(VMEXIT_NMI_WINDOW, "vm exits due to nmi window opening");
163VMM_STAT(VMEXIT_INOUT, "number of times in/out was intercepted");
164VMM_STAT(VMEXIT_CPUID, "number of times cpuid was intercepted");
165VMM_STAT(VMEXIT_NESTED_FAULT, "vm exits due to nested page fault");
166VMM_STAT(VMEXIT_INST_EMUL, "vm exits for instruction emulation");
167VMM_STAT(VMEXIT_UNKNOWN, "number of vm exits for unknown reason");
168VMM_STAT(VMEXIT_ASTPENDING, "number of times astpending at exit");
169VMM_STAT(VMEXIT_REQIDLE, "number of times idle requested at exit");
170VMM_STAT(VMEXIT_USERSPACE, "number of vm exits handled in userspace");
171VMM_STAT(VMEXIT_RENDEZVOUS, "number of times rendezvous pending at exit");
172VMM_STAT(VMEXIT_EXCEPTION, "number of vm exits due to exceptions");
173