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virtualization: check cpuid first, since it is cheaper than DMI
author
Lennart Poettering
<lennart@poettering.net>
Tue, 22 Feb 2011 00:39:19 +0000
(
01:39
+0100)
committer
Lennart Poettering
<lennart@poettering.net>
Tue, 22 Feb 2011 00:39:19 +0000
(
01:39
+0100)
src/util.c
patch
|
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diff --git
a/src/util.c
b/src/util.c
index aa49390b8738bfcf93174d6f17ac1a872ef8d3c8..e2859fafc1b115215eb7638125a126e031aa1bf5 100644
(file)
--- a/
src/util.c
+++ b/
src/util.c
@@
-3713,7
+3713,7
@@
int detect_vm(const char **id) {
/* Both CPUID and DMI are x86 specific interfaces... */
/* Both CPUID and DMI are x86 specific interfaces... */
- const char *const dmi_vendors[] = {
+
static
const char *const dmi_vendors[] = {
"/sys/class/dmi/id/sys_vendor",
"/sys/class/dmi/id/board_vendor",
"/sys/class/dmi/id/bios_vendor"
"/sys/class/dmi/id/sys_vendor",
"/sys/class/dmi/id/board_vendor",
"/sys/class/dmi/id/bios_vendor"
@@
-3727,6
+3727,7
@@
int detect_vm(const char **id) {
"Microsoft Corporation\0" "microsoft\0"
"innotek GmbH\0" "oracle\0"
"Xen\0" "xen\0"
"Microsoft Corporation\0" "microsoft\0"
"innotek GmbH\0" "oracle\0"
"Xen\0" "xen\0"
+ "Bochs\0" "bochs\0"
"\0";
static const char cpuid_vendor_table[] =
"\0";
static const char cpuid_vendor_table[] =
@@
-3743,34
+3744,9
@@
int detect_vm(const char **id) {
uint32_t sig32[3];
char text[13];
} sig;
uint32_t sig32[3];
char text[13];
} sig;
-
unsigned i;
const char *j, *k;
unsigned i;
const char *j, *k;
-
- for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) {
- char *s;
- int r;
- const char *found = NULL;
-
- if ((r = read_one_line_file(dmi_vendors[i], &s)) < 0) {
- if (r != -ENOENT)
- return r;
-
- continue;
- }
-
- NULSTR_FOREACH_PAIR(j, k, dmi_vendor_table)
- if (startswith(s, j))
- found = k;
- free(s);
-
- if (found) {
- if (id)
- *id = found;
-
- return 1;
- }
- }
+ bool hypervisor;
/* http://lwn.net/Articles/301888/ */
zero(sig);
/* http://lwn.net/Articles/301888/ */
zero(sig);
@@
-3795,7
+3771,9
@@
int detect_vm(const char **id) {
: "0" (eax)
);
: "0" (eax)
);
- if (ecx & 0x80000000U) {
+ hypervisor = !!(ecx & ecx & 0x80000000U);
+
+ if (hypervisor) {
/* There is a hypervisor, see what it is */
eax = 0x40000000U;
/* There is a hypervisor, see what it is */
eax = 0x40000000U;
@@
-3818,14
+3796,41
@@
int detect_vm(const char **id) {
return 1;
}
return 1;
}
+ }
+ for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) {
+ char *s;
+ int r;
+ const char *found = NULL;
+
+ if ((r = read_one_line_file(dmi_vendors[i], &s)) < 0) {
+ if (r != -ENOENT)
+ return r;
+
+ continue;
+ }
+
+ NULSTR_FOREACH_PAIR(j, k, dmi_vendor_table)
+ if (startswith(s, j))
+ found = k;
+ free(s);
+
+ if (found) {
+ if (id)
+ *id = found;
+
+ return 1;
+ }
+ }
+
+ if (hypervisor) {
if (id)
*id = "other";
return 1;
}
if (id)
*id = "other";
return 1;
}
-#endif
+#endif
return 0;
}
return 0;
}