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}

 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}