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
28static const __initconst struct hypervisor_x86 * const hypervisors[] =
29{
30#ifdef CONFIG_XEN
31	&x86_hyper_xen,
32#endif
33	&x86_hyper_vmware,
34	&x86_hyper_ms_hyperv,
35#ifdef CONFIG_KVM_GUEST
36	&x86_hyper_kvm,
37#endif
38};
39
40const struct hypervisor_x86 *x86_hyper;
41EXPORT_SYMBOL(x86_hyper);
42
43static inline void __init
44detect_hypervisor_vendor(void)
45{
46	const struct hypervisor_x86 *h, * const *p;
47	uint32_t pri, max_pri = 0;
48
49	for (p = hypervisors; p < hypervisors + ARRAY_SIZE(hypervisors); p++) {
50		h = *p;
51		pri = h->detect();
52		if (pri != 0 && pri > max_pri) {
53			max_pri = pri;
54			x86_hyper = h;
55		}
56	}
57
58	if (max_pri)
59		printk(KERN_INFO "Hypervisor detected: %s\n", x86_hyper->name);
60}
61
62void init_hypervisor(struct cpuinfo_x86 *c)
63{
64	if (x86_hyper && x86_hyper->set_cpu_features)
65		x86_hyper->set_cpu_features(c);
66}
67
68void __init init_hypervisor_platform(void)
69{
70
71	detect_hypervisor_vendor();
72
73	if (!x86_hyper)
74		return;
75
76	init_hypervisor(&boot_cpu_data);
77
78	if (x86_hyper->init_platform)
79		x86_hyper->init_platform();
80}
81
82bool __init hypervisor_x2apic_available(void)
83{
84	return x86_hyper                   &&
85	       x86_hyper->x2apic_available &&
86	       x86_hyper->x2apic_available();
87}
88