hypervisor.c

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/*
 * Common hypervisor code
 *
 * Copyright (C) 2008, VMware, Inc.
 * Author : Alok N Kataria <akataria@vmware.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */

#include <linux/module.h>
#include <asm/processor.h>
#include <asm/hypervisor.h>

/*
 * Hypervisor detect order.  This is specified explicitly here because
 * some hypervisors might implement compatibility modes for other
 * hypervisors and therefore need to be detected in specific sequence.
 */
static const __initconst struct hypervisor_x86 * const hypervisors[] =
{
#ifdef CONFIG_XEN_PVHVM
    &x86_hyper_xen_hvm,
#endif
    &x86_hyper_vmware,
    &x86_hyper_ms_hyperv,
#ifdef CONFIG_KVM_GUEST
    &x86_hyper_kvm,
#endif
};

const struct hypervisor_x86 *x86_hyper;
EXPORT_SYMBOL(x86_hyper);

static inline void __init
detect_hypervisor_vendor(void)
{
    const struct hypervisor_x86 *h, * const *p;

    for (p = hypervisors; p < hypervisors + ARRAY_SIZE(hypervisors); p++) {
        h = *p;
        if (h->detect()) {
            x86_hyper = h;
            printk(KERN_INFO "Hypervisor detected: %s\n", h->name);
            break;
        }
    }
}

void __cpuinit init_hypervisor(struct cpuinfo_x86 *c)
{
    if (x86_hyper && x86_hyper->set_cpu_features)
        x86_hyper->set_cpu_features(c);
}

void __init init_hypervisor_platform(void)
{

    detect_hypervisor_vendor();

    if (!x86_hyper)
        return;

    init_hypervisor(&boot_cpu_data);

    if (x86_hyper->init_platform)
        x86_hyper->init_platform();
}