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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/init.h>
25#include <linux/export.h>
26#include <asm/processor.h>
27#include <asm/hypervisor.h>
28
29extern const struct hypervisor_x86 x86_hyper_vmware;
30extern const struct hypervisor_x86 x86_hyper_ms_hyperv;
31extern const struct hypervisor_x86 x86_hyper_xen_pv;
32extern const struct hypervisor_x86 x86_hyper_xen_hvm;
33extern const struct hypervisor_x86 x86_hyper_kvm;
34extern const struct hypervisor_x86 x86_hyper_jailhouse;
35
36static const __initconst struct hypervisor_x86 * const hypervisors[] =
37{
38#ifdef CONFIG_XEN_PV
39 &x86_hyper_xen_pv,
40#endif
41#ifdef CONFIG_XEN_PVHVM
42 &x86_hyper_xen_hvm,
43#endif
44 &x86_hyper_vmware,
45 &x86_hyper_ms_hyperv,
46#ifdef CONFIG_KVM_GUEST
47 &x86_hyper_kvm,
48#endif
49#ifdef CONFIG_JAILHOUSE_GUEST
50 &x86_hyper_jailhouse,
51#endif
52};
53
54enum x86_hypervisor_type x86_hyper_type;
55EXPORT_SYMBOL(x86_hyper_type);
56
57static inline const struct hypervisor_x86 * __init
58detect_hypervisor_vendor(void)
59{
60 const struct hypervisor_x86 *h = NULL, * const *p;
61 uint32_t pri, max_pri = 0;
62
63 for (p = hypervisors; p < hypervisors + ARRAY_SIZE(hypervisors); p++) {
64 pri = (*p)->detect();
65 if (pri > max_pri) {
66 max_pri = pri;
67 h = *p;
68 }
69 }
70
71 if (h)
72 pr_info("Hypervisor detected: %s\n", h->name);
73
74 return h;
75}
76
77static void __init copy_array(const void *src, void *target, unsigned int size)
78{
79 unsigned int i, n = size / sizeof(void *);
80 const void * const *from = (const void * const *)src;
81 const void **to = (const void **)target;
82
83 for (i = 0; i < n; i++)
84 if (from[i])
85 to[i] = from[i];
86}
87
88void __init init_hypervisor_platform(void)
89{
90 const struct hypervisor_x86 *h;
91
92 h = detect_hypervisor_vendor();
93
94 if (!h)
95 return;
96
97 copy_array(&h->init, &x86_init.hyper, sizeof(h->init));
98 copy_array(&h->runtime, &x86_platform.hyper, sizeof(h->runtime));
99
100 x86_hyper_type = h->type;
101 x86_init.hyper.init_platform();
102}
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}