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88b094fb AK |
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 | ||
3998d095 | 24 | #include <linux/module.h> |
88b094fb | 25 | #include <asm/processor.h> |
4e42ebd5 | 26 | #include <asm/hypervisor.h> |
88b094fb | 27 | |
e08cae41 | 28 | static const __initconst struct hypervisor_x86 * const hypervisors[] = |
88b094fb | 29 | { |
ca65f9fc | 30 | #ifdef CONFIG_XEN_PVHVM |
bee6ab53 | 31 | &x86_hyper_xen_hvm, |
b43275d6 | 32 | #endif |
24a42bae AC |
33 | &x86_hyper_vmware, |
34 | &x86_hyper_ms_hyperv, | |
d63d3e62 | 35 | #ifdef CONFIG_KVM_GUEST |
fc73373b | 36 | &x86_hyper_kvm, |
d63d3e62 | 37 | #endif |
e08cae41 | 38 | }; |
88b094fb | 39 | |
e08cae41 | 40 | const struct hypervisor_x86 *x86_hyper; |
96f6e775 | 41 | EXPORT_SYMBOL(x86_hyper); |
e08cae41 PA |
42 | |
43 | static inline void __init | |
44 | detect_hypervisor_vendor(void) | |
eca0cd02 | 45 | { |
e08cae41 | 46 | const struct hypervisor_x86 *h, * const *p; |
9df56f19 | 47 | uint32_t pri, max_pri = 0; |
e08cae41 PA |
48 | |
49 | for (p = hypervisors; p < hypervisors + ARRAY_SIZE(hypervisors); p++) { | |
50 | h = *p; | |
9df56f19 JW |
51 | pri = h->detect(); |
52 | if (pri != 0 && pri > max_pri) { | |
53 | max_pri = pri; | |
e08cae41 | 54 | x86_hyper = h; |
e08cae41 PA |
55 | } |
56 | } | |
9df56f19 JW |
57 | |
58 | if (max_pri) | |
59 | printk(KERN_INFO "Hypervisor detected: %s\n", x86_hyper->name); | |
eca0cd02 AK |
60 | } |
61 | ||
148f9bb8 | 62 | void init_hypervisor(struct cpuinfo_x86 *c) |
88b094fb | 63 | { |
e08cae41 PA |
64 | if (x86_hyper && x86_hyper->set_cpu_features) |
65 | x86_hyper->set_cpu_features(c); | |
88b094fb | 66 | } |
2d826404 TG |
67 | |
68 | void __init init_hypervisor_platform(void) | |
69 | { | |
e08cae41 PA |
70 | |
71 | detect_hypervisor_vendor(); | |
72 | ||
73 | if (!x86_hyper) | |
74 | return; | |
75 | ||
2d826404 | 76 | init_hypervisor(&boot_cpu_data); |
e08cae41 PA |
77 | |
78 | if (x86_hyper->init_platform) | |
79 | x86_hyper->init_platform(); | |
2d826404 | 80 | } |
4cca6ea0 AK |
81 | |
82 | bool __init hypervisor_x2apic_available(void) | |
83 | { | |
84 | return x86_hyper && | |
85 | x86_hyper->x2apic_available && | |
86 | x86_hyper->x2apic_available(); | |
87 | } |