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
 
 
 
 
 
 
 
28static const __initconst struct hypervisor_x86 * const hypervisors[] =
29{
 
 
 
30#ifdef CONFIG_XEN_PVHVM
31	&x86_hyper_xen_hvm,
32#endif
33	&x86_hyper_vmware,
34	&x86_hyper_ms_hyperv,
35#ifdef CONFIG_KVM_GUEST
36	&x86_hyper_kvm,
37#endif
 
 
 
38};
39
40const struct hypervisor_x86 *x86_hyper;
41EXPORT_SYMBOL(x86_hyper);
42
43static inline void __init
44detect_hypervisor_vendor(void)
45{
46	const struct hypervisor_x86 *h, * const *p;
47	uint32_t pri, max_pri = 0;
48
49	for (p = hypervisors; p < hypervisors + ARRAY_SIZE(hypervisors); p++) {
50		h = *p;
51		pri = h->detect();
52		if (pri != 0 && pri > max_pri) {
53			max_pri = pri;
54			x86_hyper = h;
55		}
56	}
57
58	if (max_pri)
59		printk(KERN_INFO "Hypervisor detected: %s\n", x86_hyper->name);
 
 
60}
61
62void init_hypervisor(struct cpuinfo_x86 *c)
63{
64	if (x86_hyper && x86_hyper->set_cpu_features)
65		x86_hyper->set_cpu_features(c);
 
 
 
 
 
66}
67
68void __init init_hypervisor_platform(void)
69{
 
70
71	detect_hypervisor_vendor();
72
73	if (!x86_hyper)
74		return;
75
76	init_hypervisor(&boot_cpu_data);
 
77
78	if (x86_hyper->init_platform)
79		x86_hyper->init_platform();
80}
81
82bool __init hypervisor_x2apic_available(void)
83{
84	return x86_hyper                   &&
85	       x86_hyper->x2apic_available &&
86	       x86_hyper->x2apic_available();
87}