FreeBSD/Linux Kernel Cross Reference
sys/amd64/vmm/vmm_stat.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2011 NetApp, Inc.
      * 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 NETAPP, INC ``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 NETAPP, INC 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.
     *
     * $FreeBSD$
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/systm.h>
    #include <sys/malloc.h>
    
    #include <machine/vmm.h>
    #include "vmm_util.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->scope == VMM_STAT_SCOPE_INTEL && !vmm_is_intel())
                    return;
    
            if (vst->scope == VMM_STAT_SCOPE_AMD && !vmm_is_svm())
                    return;
    
            if (vst->nelems == VMM_STAT_NELEMS_VCPU)
                    vst->nelems = vm_maxcpu;
    
            if (vst_num_elems + vst->nelems >= MAX_VMM_STAT_ELEMS) {
                    printf("Cannot accommodate 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 vcpu *vcpu, int index, int count, int *num_stats,
        uint64_t *buf)
    {
            struct vmm_stat_type *vst;
            uint64_t *stats;
            int i, tocopy;
    
            if (index < 0 || count < 0)
                    return (EINVAL);
    
            if (index > vst_num_elems)
                    return (ENOENT);
   
           if (index == vst_num_elems) {
                   *num_stats = 0;
                   return (0);
           }
   
           tocopy = min(vst_num_elems - index, count);
   
           /* Let stats functions update their counters */
           for (i = 0; i < vst_num_types; i++) {
                   vst = vsttab[i];
                   if (vst->func != NULL)
                           (*vst->func)(vcpu, vst);
           }
   
           /* Copy over the stats */
           stats = vcpu_stats(vcpu);
           memcpy(buf, stats + index, tocopy * sizeof(stats[0]));
           *num_stats = tocopy;
           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_REQIDLE, "number of times idle requested 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");

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