4afb5a2130ed2c983ce2e31c6149432d52a3bcde
[linux-2.6.git] / 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 <asm/processor.h>
25 #include <asm/hypervisor.h>
26
27 /*
28  * Hypervisor detect order.  This is specified explicitly here because
29  * some hypervisors might implement compatibility modes for other
30  * hypervisors and therefore need to be detected in specific sequence.
31  */
32 static const __initconst struct hypervisor_x86 * const hypervisors[] =
33 {
34         &x86_hyper_vmware,
35         &x86_hyper_ms_hyperv,
36 };
37
38 const struct hypervisor_x86 *x86_hyper;
39 EXPORT_SYMBOL(x86_hyper);
40
41 static inline void __init
42 detect_hypervisor_vendor(void)
43 {
44         const struct hypervisor_x86 *h, * const *p;
45
46         for (p = hypervisors; p < hypervisors + ARRAY_SIZE(hypervisors); p++) {
47                 h = *p;
48                 if (h->detect()) {
49                         x86_hyper = h;
50                         printk(KERN_INFO "Hypervisor detected: %s\n", h->name);
51                         break;
52                 }
53         }
54 }
55
56 void __cpuinit init_hypervisor(struct cpuinfo_x86 *c)
57 {
58         if (x86_hyper && x86_hyper->set_cpu_features)
59                 x86_hyper->set_cpu_features(c);
60 }
61
62 void __init init_hypervisor_platform(void)
63 {
64
65         detect_hypervisor_vendor();
66
67         if (!x86_hyper)
68                 return;
69
70         init_hypervisor(&boot_cpu_data);
71
72         if (x86_hyper->init_platform)
73                 x86_hyper->init_platform();
74 }