Differential D26976 Diff 79613 sys/arm64/vmm/vmm_stat.c

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sys/arm64/vmm/vmm_stat.c

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				/*
				* Copyright (C) 2015 Mihai Carabas <mihai.carabas@gmail.com>
				* All rights reserved.
				*
				* Redistribution and use in source and binary forms, with or without
				* modification, are permitted provided that the following conditions
				* are met:
				* 1. Redistributions of source code must retain the above copyright
				* notice, this list of conditions and the following disclaimer.
				* 2. Redistributions in binary form must reproduce the above copyright
				* notice, this list of conditions and the following disclaimer in the
				* documentation and/or other materials provided with the distribution.
				*
				* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
				* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
				* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
				* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
				* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
				* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
				* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
				* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
				* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
				* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
				* SUCH DAMAGE.
				*/

				#include <sys/cdefs.h>

				#include <sys/param.h>
				#include <sys/kernel.h>
				#include <sys/systm.h>
				#include <sys/malloc.h>

				#include <machine/vmm.h>
				#include "vmm_stat.h"

				/*
				* 'vst_num_elems' is the total number of addressable statistic elements
				* 'vst_num_types' is the number of unique statistic types
				*
				* It is always true that 'vst_num_elems' is greater than or equal to
				* 'vst_num_types'. This is because a stat type may represent more than
				* one element (for e.g. VMM_STAT_ARRAY).
				*/
				static int vst_num_elems, vst_num_types;
				static struct vmm_stat_type *vsttab[MAX_VMM_STAT_ELEMS];

				static MALLOC_DEFINE(M_VMM_STAT, "vmm stat", "vmm stat");

				#define vst_size ((size_t)vst_num_elems * sizeof(uint64_t))

				void
				vmm_stat_register(void *arg)
				{
				struct vmm_stat_type *vst = arg;

				/* We require all stats to identify themselves with a description */
				if (vst->desc == NULL)
				return;

				if (vst_num_elems + vst->nelems >= MAX_VMM_STAT_ELEMS) {
				printf("Cannot accomodate vmm stat type \"%s\"!\n", vst->desc);
				return;
				}

				vst->index = vst_num_elems;
				vst_num_elems += vst->nelems;

				vsttab[vst_num_types++] = vst;
				}

				int
				vmm_stat_copy(struct vm vm, int vcpu, int num_stats, uint64_t *buf)
				{
				struct vmm_stat_type *vst;
				uint64_t *stats;
				int i;

				if (vcpu < 0 \|\| vcpu >= VM_MAXCPU)
				return (EINVAL);

				/* Let stats functions update their counters */
				for (i = 0; i < vst_num_types; i++) {
				vst = vsttab[i];
				if (vst->func != NULL)
				(*vst->func)(vm, vcpu, vst);
				}

				/* Copy over the stats */
				stats = vcpu_stats(vm, vcpu);
				for (i = 0; i < vst_num_elems; i++)
				buf[i] = stats[i];
				*num_stats = vst_num_elems;
				return (0);
				}

				void *
				vmm_stat_alloc(void)
				{

				return (malloc(vst_size, M_VMM_STAT, M_WAITOK));
				}

				void
				vmm_stat_init(void *vp)
				{

				bzero(vp, vst_size);
				}

				void
				vmm_stat_free(void *vp)
				{
				free(vp, M_VMM_STAT);
				}

				int
				vmm_stat_desc_copy(int index, char *buf, int bufsize)
				{
				int i;
				struct vmm_stat_type *vst;

				for (i = 0; i < vst_num_types; i++) {
				vst = vsttab[i];
				if (index >= vst->index && index < vst->index + vst->nelems) {
				if (vst->nelems > 1) {
				snprintf(buf, bufsize, "%s[%d]",
				vst->desc, index - vst->index);
				} else {
				strlcpy(buf, vst->desc, bufsize);
				}
				return (0); /* found it */
				}
				}

				return (EINVAL);
				}

				/* global statistics */
				VMM_STAT(VCPU_MIGRATIONS, "vcpu migration across host cpus");
				VMM_STAT(VMEXIT_COUNT, "total number of vm exits");
				VMM_STAT(VMEXIT_EXTINT, "vm exits due to external interrupt");
				VMM_STAT(VMEXIT_HLT, "number of times hlt was intercepted");
				VMM_STAT(VMEXIT_CR_ACCESS, "number of times %cr access was intercepted");
				VMM_STAT(VMEXIT_RDMSR, "number of times rdmsr was intercepted");
				VMM_STAT(VMEXIT_WRMSR, "number of times wrmsr was intercepted");
				VMM_STAT(VMEXIT_MTRAP, "number of monitor trap exits");
				VMM_STAT(VMEXIT_PAUSE, "number of times pause was intercepted");
				VMM_STAT(VMEXIT_INTR_WINDOW, "vm exits due to interrupt window opening");
				VMM_STAT(VMEXIT_NMI_WINDOW, "vm exits due to nmi window opening");
				VMM_STAT(VMEXIT_INOUT, "number of times in/out was intercepted");
				VMM_STAT(VMEXIT_CPUID, "number of times cpuid was intercepted");
				VMM_STAT(VMEXIT_NESTED_FAULT, "vm exits due to nested page fault");
				VMM_STAT(VMEXIT_INST_EMUL, "vm exits for instruction emulation");
				VMM_STAT(VMEXIT_UNKNOWN, "number of vm exits for unknown reason");
				VMM_STAT(VMEXIT_ASTPENDING, "number of times astpending at exit");
				VMM_STAT(VMEXIT_USERSPACE, "number of vm exits handled in userspace");
				VMM_STAT(VMEXIT_RENDEZVOUS, "number of times rendezvous pending at exit");
				VMM_STAT(VMEXIT_EXCEPTION, "number of vm exits due to exceptions");