LXR linux/arch/x86/kernel/cpu/hypervisor.c

   1/*
   2 * Common hypervisor code
   3 *
   4 * Copyright (C) 2008, VMware, Inc.
   5 * Author : Alok N Kataria <akataria@vmware.com>
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License as published by
   9 * the Free Software Foundation; either version 2 of the License, or
  10 * (at your option) any later version.
  11 *
  12 * This program is distributed in the hope that it will be useful, but
  13 * WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  15 * NON INFRINGEMENT.  See the GNU General Public License for more
  16 * details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  21 *
  22 */
  23
  24#include <linux/init.h>
  25#include <linux/export.h>
  26#include <asm/processor.h>
  27#include <asm/hypervisor.h>
  28
  29static const __initconst struct hypervisor_x86 * const hypervisors[] =
  30{
  31#ifdef CONFIG_XEN_PV
  32        &x86_hyper_xen_pv,
  33#endif
  34#ifdef CONFIG_XEN_PVHVM
  35        &x86_hyper_xen_hvm,
  36#endif
  37        &x86_hyper_vmware,
  38        &x86_hyper_ms_hyperv,
  39#ifdef CONFIG_KVM_GUEST
  40        &x86_hyper_kvm,
  41#endif
  42#ifdef CONFIG_JAILHOUSE_GUEST
  43        &x86_hyper_jailhouse,
  44#endif
  45#ifdef CONFIG_ACRN_GUEST
  46        &x86_hyper_acrn,
  47#endif
  48};
  49
  50enum x86_hypervisor_type x86_hyper_type;
  51EXPORT_SYMBOL(x86_hyper_type);
  52
  53bool __initdata nopv;
  54static __init int parse_nopv(char *arg)
  55{
  56        nopv = true;
  57        return 0;
  58}
  59early_param("nopv", parse_nopv);
  60
  61static inline const struct hypervisor_x86 * __init
  62detect_hypervisor_vendor(void)
  63{
  64        const struct hypervisor_x86 *h = NULL, * const *p;
  65        uint32_t pri, max_pri = 0;
  66
  67        for (p = hypervisors; p < hypervisors + ARRAY_SIZE(hypervisors); p++) {
  68                if (unlikely(nopv) && !(*p)->ignore_nopv)
  69                        continue;
  70
  71                pri = (*p)->detect();
  72                if (pri > max_pri) {
  73                        max_pri = pri;
  74                        h = *p;
  75                }
  76        }
  77
  78        if (h)
  79                pr_info("Hypervisor detected: %s\n", h->name);
  80
  81        return h;
  82}
  83
  84static void __init copy_array(const void *src, void *target, unsigned int size)
  85{
  86        unsigned int i, n = size / sizeof(void *);
  87        const void * const *from = (const void * const *)src;
  88        const void **to = (const void **)target;
  89
  90        for (i = 0; i < n; i++)
  91                if (from[i])
  92                        to[i] = from[i];
  93}
  94
  95void __init init_hypervisor_platform(void)
  96{
  97        const struct hypervisor_x86 *h;
  98
  99        h = detect_hypervisor_vendor();
 100
 101        if (!h)
 102                return;
 103
 104        copy_array(&h->init, &x86_init.hyper, sizeof(h->init));
 105        copy_array(&h->runtime, &x86_platform.hyper, sizeof(h->runtime));
 106
 107        x86_hyper_type = h->type;
 108        x86_init.hyper.init_platform();
 109}
 110