linux/arch/x86/kernel/cpu/hypervisor.c
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   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/module.h>
  25#include <asm/processor.h>
  26#include <asm/hypervisor.h>
  27
  28/*
  29 * Hypervisor detect order.  This is specified explicitly here because
  30 * some hypervisors might implement compatibility modes for other
  31 * hypervisors and therefore need to be detected in specific sequence.
  32 */
  33static const __initconst struct hypervisor_x86 * const hypervisors[] =
  34{
  35#ifdef CONFIG_XEN_PVHVM
  36        &x86_hyper_xen_hvm,
  37#endif
  38        &x86_hyper_vmware,
  39        &x86_hyper_ms_hyperv,
  40};
  41
  42const struct hypervisor_x86 *x86_hyper;
  43EXPORT_SYMBOL(x86_hyper);
  44
  45static inline void __init
  46detect_hypervisor_vendor(void)
  47{
  48        const struct hypervisor_x86 *h, * const *p;
  49
  50        for (p = hypervisors; p < hypervisors + ARRAY_SIZE(hypervisors); p++) {
  51                h = *p;
  52                if (h->detect()) {
  53                        x86_hyper = h;
  54                        printk(KERN_INFO "Hypervisor detected: %s\n", h->name);
  55                        break;
  56                }
  57        }
  58}
  59
  60void __cpuinit init_hypervisor(struct cpuinfo_x86 *c)
  61{
  62        if (x86_hyper && x86_hyper->set_cpu_features)
  63                x86_hyper->set_cpu_features(c);
  64}
  65
  66void __init init_hypervisor_platform(void)
  67{
  68
  69        detect_hypervisor_vendor();
  70
  71        if (!x86_hyper)
  72                return;
  73
  74        init_hypervisor(&boot_cpu_data);
  75
  76        if (x86_hyper->init_platform)
  77                x86_hyper->init_platform();
  78}
  79
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