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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/init.h>
25#include <linux/export.h>
26#include <asm/processor.h>
27#include <asm/hypervisor.h>
28
29static const __initconst struct hypervisor_x86 * const hypervisors[] =
30{
31#ifdef CONFIG_XEN
32 &x86_hyper_xen,
33#endif
34 &x86_hyper_vmware,
35 &x86_hyper_ms_hyperv,
36#ifdef CONFIG_KVM_GUEST
37 &x86_hyper_kvm,
38#endif
39};
40
41const struct hypervisor_x86 *x86_hyper;
42EXPORT_SYMBOL(x86_hyper);
43
44static inline void __init
45detect_hypervisor_vendor(void)
46{
47 const struct hypervisor_x86 *h, * const *p;
48 uint32_t pri, max_pri = 0;
49
50 for (p = hypervisors; p < hypervisors + ARRAY_SIZE(hypervisors); p++) {
51 h = *p;
52 pri = h->detect();
53 if (pri != 0 && pri > max_pri) {
54 max_pri = pri;
55 x86_hyper = h;
56 }
57 }
58
59 if (max_pri)
60 pr_info("Hypervisor detected: %s\n", x86_hyper->name);
61}
62
63void init_hypervisor(struct cpuinfo_x86 *c)
64{
65 if (x86_hyper && x86_hyper->set_cpu_features)
66 x86_hyper->set_cpu_features(c);
67}
68
69void __init init_hypervisor_platform(void)
70{
71
72 detect_hypervisor_vendor();
73
74 if (!x86_hyper)
75 return;
76
77 init_hypervisor(&boot_cpu_data);
78
79 if (x86_hyper->init_platform)
80 x86_hyper->init_platform();
81}
82
83bool __init hypervisor_x2apic_available(void)
84{
85 return x86_hyper &&
86 x86_hyper->x2apic_available &&
87 x86_hyper->x2apic_available();
88}
89
90void hypervisor_pin_vcpu(int cpu)
91{
92 if (!x86_hyper)
93 return;
94
95 if (x86_hyper->pin_vcpu)
96 x86_hyper->pin_vcpu(cpu);
97 else
98 WARN_ONCE(1, "vcpu pinning requested but not supported!\n");
99}