vmm_stat.c revision 270071 
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 270071 2014-08-17 01:00:42Z grehan $
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: stable/10/sys/amd64/vmm/vmm_stat.c 270071 2014-08-17 01:00:42Z 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	int i;
87	uint64_t *stats;
88
89	if (vcpu < 0 || vcpu >= VM_MAXCPU)
90		return (EINVAL);
91
92	stats = vcpu_stats(vm, vcpu);
93	for (i = 0; i < vst_num_elems; i++)
94		buf[i] = stats[i];
95	*num_stats = vst_num_elems;
96	return (0);
97}
98
99void *
100vmm_stat_alloc(void)
101{
102
103	return (malloc(vst_size, M_VMM_STAT, M_WAITOK));
104}
105
106void
107vmm_stat_init(void *vp)
108{
109
110	bzero(vp, vst_size);
111}
112
113void
114vmm_stat_free(void *vp)
115{
116	free(vp, M_VMM_STAT);
117}
118
119int
120vmm_stat_desc_copy(int index, char *buf, int bufsize)
121{
122	int i;
123	struct vmm_stat_type *vst;
124
125	for (i = 0; i < vst_num_types; i++) {
126		vst = vsttab[i];
127		if (index >= vst->index && index < vst->index + vst->nelems) {
128			if (vst->nelems > 1) {
129				snprintf(buf, bufsize, "%s[%d]",
130					 vst->desc, index - vst->index);
131			} else {
132				strlcpy(buf, vst->desc, bufsize);
133			}
134			return (0);	/* found it */
135		}
136	}
137
138	return (EINVAL);
139}
140
141/* global statistics */
142VMM_STAT(VCPU_MIGRATIONS, "vcpu migration across host cpus");
143VMM_STAT(VMEXIT_COUNT, "total number of vm exits");
144VMM_STAT(VMEXIT_EXTINT, "vm exits due to external interrupt");
145VMM_STAT(VMEXIT_HLT, "number of times hlt was intercepted");
146VMM_STAT(VMEXIT_CR_ACCESS, "number of times %cr access was intercepted");
147VMM_STAT(VMEXIT_RDMSR, "number of times rdmsr was intercepted");
148VMM_STAT(VMEXIT_WRMSR, "number of times wrmsr was intercepted");
149VMM_STAT(VMEXIT_MTRAP, "number of monitor trap exits");
150VMM_STAT(VMEXIT_PAUSE, "number of times pause was intercepted");
151VMM_STAT(VMEXIT_INTR_WINDOW, "vm exits due to interrupt window opening");
152VMM_STAT(VMEXIT_NMI_WINDOW, "vm exits due to nmi window opening");
153VMM_STAT(VMEXIT_INOUT, "number of times in/out was intercepted");
154VMM_STAT(VMEXIT_CPUID, "number of times cpuid was intercepted");
155VMM_STAT(VMEXIT_NESTED_FAULT, "vm exits due to nested page fault");
156VMM_STAT(VMEXIT_INST_EMUL, "vm exits for instruction emulation");
157VMM_STAT(VMEXIT_UNKNOWN, "number of vm exits for unknown reason");
158VMM_STAT(VMEXIT_ASTPENDING, "number of times astpending at exit");
159VMM_STAT(VMEXIT_USERSPACE, "number of vm exits handled in userspace");
160VMM_STAT(VMEXIT_RENDEZVOUS, "number of times rendezvous pending at exit");
161VMM_STAT(VMEXIT_EXCEPTION, "number of vm exits due to exceptions");
162