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
29 static const __initconst struct hypervisor_x86 * const hypervisors[] =
30 {
31 #ifdef CONFIG_XEN_PV
32 &x86_hyper_xen_pv,
33 #endif
34 #ifdef CONFIG_XEN_PVHVM
35 &x86_hyper_xen_hvm,
36 #endif
37 &x86_hyper_vmware,
38 &x86_hyper_ms_hyperv,
39 #ifdef CONFIG_KVM_GUEST
40 &x86_hyper_kvm,
41 #endif
42 #ifdef CONFIG_JAILHOUSE_GUEST
43 &x86_hyper_jailhouse,
44 #endif
45 #ifdef CONFIG_ACRN_GUEST
46 &x86_hyper_acrn,
47 #endif
48 #ifdef CONFIG_BHYVE_GUEST
49 &x86_hyper_bhyve,
50 #endif
51 };
52
53 enum x86_hypervisor_type x86_hyper_type;
54 EXPORT_SYMBOL(x86_hyper_type);
55
56 bool __initdata nopv;
parse_nopv(char * arg)57 static __init int parse_nopv(char *arg)
58 {
59 nopv = true;
60 return 0;
61 }
62 early_param("nopv", parse_nopv);
63
64 static inline const struct hypervisor_x86 * __init
detect_hypervisor_vendor(void)65 detect_hypervisor_vendor(void)
66 {
67 const struct hypervisor_x86 *h = NULL, * const *p;
68 uint32_t pri, max_pri = 0;
69
70 for (p = hypervisors; p < hypervisors + ARRAY_SIZE(hypervisors); p++) {
71 if (unlikely(nopv) && !(*p)->ignore_nopv)
72 continue;
73
74 pri = (*p)->detect();
75 if (pri > max_pri) {
76 max_pri = pri;
77 h = *p;
78 }
79 }
80
81 if (h)
82 pr_info("Hypervisor detected: %s\n", h->name);
83
84 return h;
85 }
86
copy_array(const void * src,void * target,unsigned int size)87 static void __init copy_array(const void *src, void *target, unsigned int size)
88 {
89 unsigned int i, n = size / sizeof(void *);
90 const void * const *from = (const void * const *)src;
91 const void **to = (const void **)target;
92
93 for (i = 0; i < n; i++)
94 if (from[i])
95 to[i] = from[i];
96 }
97
init_hypervisor_platform(void)98 void __init init_hypervisor_platform(void)
99 {
100 const struct hypervisor_x86 *h;
101
102 h = detect_hypervisor_vendor();
103
104 if (!h)
105 return;
106
107 copy_array(&h->init, &x86_init.hyper, sizeof(h->init));
108 copy_array(&h->runtime, &x86_platform.hyper, sizeof(h->runtime));
109
110 x86_hyper_type = h->type;
111 x86_init.hyper.init_platform();
112 }
113