1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/*
* Identify hypervisor vendor
*
* This is based on code from lscpu and virt-what. Unfortunately, neither
* of those is sufficient. lscpu doesn't detect many VM's,
* and virt-what is a shell script that has to be run as root.
*
* **** License ****
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
* #
* A copy of the GNU General Public License is available as
* `/usr/share/common-licenses/GPL' in the Debian GNU/Linux distribution
* or on the World Wide Web at `http://www.gnu.org/copyleft/gpl.html'.
* You can also obtain it by writing to the Free Software Foundation,
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
* Portions created by Vyatta are Copyright (C) 2011 Vyatta, Inc.
* All Rights Reserved.
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#define PROC_XEN "/proc/xen"
#define PROC_XENCAP PROC_XEN "/capabilities"
#define PROC_PCIDEVS "/proc/bus/pci/devices"
#define SYS_HYPERVISOR "/sys/hypervisor/type"
#define SYS_DMI_VENDOR "/sys/class/dmi/id/sys_vendor"
/*
* This CPUID leaf returns the information about the hypervisor.
* EAX : maximum input value for CPUID supported by the hypervisor.
* EBX, ECX, EDX : Hypervisor vendor ID signature. E.g. VMwareVMware.
*/
#define HYPERVISOR_INFO_LEAF 0x40000000
static inline void
cpuid(unsigned int op, unsigned int *eax, unsigned int *ebx,
unsigned int *ecx, unsigned int *edx)
{
__asm__(
#if defined(__PIC__) && defined(__i386__)
/* x86 PIC cannot clobber ebx -- gcc bitches */
"pushl %%ebx;"
"cpuid;"
"movl %%ebx, %%esi;"
"popl %%ebx;"
: "=S" (*ebx),
#else
"cpuid;"
: "=b" (*ebx),
#endif
"=a" (*eax),
"=c" (*ecx),
"=d" (*edx)
: "1" (op), "c"(0));
}
/* Use CPUID instruction to find hypervisor vendor.
* This is the preferred method, but doesn't work with older
* hypervisors.
*/
static const char *get_hypervisor_cpuid(void)
{
unsigned int eax = 0, ebx = 0, ecx = 0, edx = 0;
char hyper_vendor_id[13];
memset(hyper_vendor_id, 0, sizeof(hyper_vendor_id));
cpuid(HYPERVISOR_INFO_LEAF, &eax, &ebx, &ecx, &edx);
memcpy(hyper_vendor_id + 0, &ebx, 4);
memcpy(hyper_vendor_id + 4, &ecx, 4);
memcpy(hyper_vendor_id + 8, &edx, 4);
hyper_vendor_id[12] = '\0';
if (!hyper_vendor_id[0])
return NULL;
else if (!strncmp("XenVMMXenVMM", hyper_vendor_id, 12))
return "Xen hvm";
else if (!strncmp("KVMKVMKVM", hyper_vendor_id, 9))
return "KVM";
else if (!strncmp("Microsoft Hv", hyper_vendor_id, 12))
return "Microsoft HyperV";
else if (!strncmp("VMwareVMware", hyper_vendor_id, 12))
return "VMware";
else
return NULL;
}
/* Use DMI vendor information */
static const char *get_hypervisor_dmi(void)
{
FILE *f = fopen(SYS_DMI_VENDOR, "r");
char vendor_id[128];
if (!f)
return NULL;
if (fgets(vendor_id, sizeof(vendor_id), f) == NULL) {
fclose(f);
return NULL;
}
fclose(f);
if (!strncmp(vendor_id, "VMware", 6))
return "VMware";
/* Note: Hyper-V has same DMI, but different CPUID */
else if (!strncmp(vendor_id, "Microsoft Corporation", 21))
return "VirtualPC";
else if (!strncmp(vendor_id, "innotek GmbH", 12))
return "VirtualBox";
else if (!strncmp(vendor_id, "Parallels", 9))
return "Parallels";
else
return NULL;
}
static int
has_pci_device(int vendor, int device)
{
FILE *f;
int num, fn, ven, dev;
int res = 1;
f = fopen(PROC_PCIDEVS, "r");
if (!f)
return 0;
/* for more details about bus/pci/devices format see
* drivers/pci/proc.c in linux kernel
*/
while(fscanf(f, "%02x%02x\t%04x%04x\t%*[^\n]",
&num, &fn, &ven, &dev) == 4) {
if (ven == vendor && dev == device)
goto found;
}
res = 0;
found:
fclose(f);
return res;
}
int main(int argc, char **argv)
{
FILE *f;
const char *hvm;
char buf[256];
if ((hvm = get_hypervisor_cpuid()) != NULL ||
(hvm = get_hypervisor_dmi()) != NULL)
printf("%s\n", hvm);
/* Grotty code to look for old Xen */
else if ((f = fopen(PROC_XENCAP, "r")) != NULL) {
int dom0 = 0;
if (fscanf(f, "%s", buf) == 1 &&
!strcmp(buf, "control_d"))
dom0 = 1;
printf("Xen %s\n", dom0 ? "dom0" : "domU");
fclose(f);
}
else if ((f = fopen(SYS_HYPERVISOR, "r")) != NULL) {
if (fgets(buf, sizeof(buf), f) != NULL
&& !strncmp(buf, "xen", 3))
printf("Xen\n");
fclose(f);
}
else if (has_pci_device(0x5853, 0x0001)) {
/* Xen full-virt on non-x86_64 */
printf("Xen full\n");
}
/* print nothing if in real mode */
return 0;
}
|
