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_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};
 49
 50enum x86_hypervisor_type x86_hyper_type;
 51EXPORT_SYMBOL(x86_hyper_type);
 52
 53bool __initdata nopv;
 54static __init int parse_nopv(char *arg)
 55{
 56	nopv = true;
 57	return 0;
 58}
 59early_param("nopv", parse_nopv);
 60
 61static inline const struct hypervisor_x86 * __init
 62detect_hypervisor_vendor(void)
 63{
 64	const struct hypervisor_x86 *h = NULL, * const *p;
 65	uint32_t pri, max_pri = 0;
 66
 67	for (p = hypervisors; p < hypervisors + ARRAY_SIZE(hypervisors); p++) {
 68		if (unlikely(nopv) && !(*p)->ignore_nopv)
 69			continue;
 70
 71		pri = (*p)->detect();
 72		if (pri > max_pri) {
 73			max_pri = pri;
 74			h = *p;
 75		}
 76	}
 77
 78	if (h)
 79		pr_info("Hypervisor detected: %s\n", h->name);
 80
 81	return h;
 82}
 83
 84static void __init copy_array(const void *src, void *target, unsigned int size)
 85{
 86	unsigned int i, n = size / sizeof(void *);
 87	const void * const *from = (const void * const *)src;
 88	const void **to = (const void **)target;
 89
 90	for (i = 0; i < n; i++)
 91		if (from[i])
 92			to[i] = from[i];
 93}
 94
 95void __init init_hypervisor_platform(void)
 96{
 97	const struct hypervisor_x86 *h;
 98
 99	h = detect_hypervisor_vendor();
100
101	if (!h)
102		return;
103
104	copy_array(&h->init, &x86_init.hyper, sizeof(h->init));
105	copy_array(&h->runtime, &x86_platform.hyper, sizeof(h->runtime));
106
107	x86_hyper_type = h->type;
108	x86_init.hyper.init_platform();
109}

 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}