This file is part of systemd.
Copyright 2011 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd 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
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
+#if defined(__i386__) || defined(__x86_64__)
+#include <cpuid.h>
+#endif
#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
{ "Microsoft Hv", VIRTUALIZATION_MICROSOFT },
/* https://wiki.freebsd.org/bhyve */
{ "bhyve bhyve ", VIRTUALIZATION_BHYVE },
+ { "QNXQVMBSQG", VIRTUALIZATION_QNX },
};
- uint32_t eax, ecx;
+ uint32_t eax, ebx, ecx, edx;
bool hypervisor;
/* http://lwn.net/Articles/301888/ */
-#if defined (__i386__)
-#define REG_a "eax"
-#define REG_b "ebx"
-#elif defined (__amd64__)
-#define REG_a "rax"
-#define REG_b "rbx"
-#endif
-
/* First detect whether there is a hypervisor */
- eax = 1;
- __asm__ __volatile__ (
- /* ebx/rbx is being used for PIC! */
- " push %%"REG_b" \n\t"
- " cpuid \n\t"
- " pop %%"REG_b" \n\t"
-
- : "=a" (eax), "=c" (ecx)
- : "0" (eax)
- );
+ if (__get_cpuid(1, &eax, &ebx, &ecx, &edx) == 0)
+ return VIRTUALIZATION_NONE;
- hypervisor = !!(ecx & 0x80000000U);
+ hypervisor = ecx & 0x80000000U;
if (hypervisor) {
union {
unsigned j;
/* There is a hypervisor, see what it is */
- eax = 0x40000000U;
- __asm__ __volatile__ (
- /* ebx/rbx is being used for PIC! */
- " push %%"REG_b" \n\t"
- " cpuid \n\t"
- " mov %%ebx, %1 \n\t"
- " pop %%"REG_b" \n\t"
-
- : "=a" (eax), "=r" (sig.sig32[0]), "=c" (sig.sig32[1]), "=d" (sig.sig32[2])
- : "0" (eax)
- );
+ __cpuid(0x40000000U, eax, ebx, ecx, edx);
+
+ sig.sig32[0] = ebx;
+ sig.sig32[1] = ecx;
+ sig.sig32[2] = edx;
log_debug("Virtualization found, CPUID=%s", sig.text);
if (r == 0) {
unsigned long features;
- r = safe_atolu(domcap, &features);
- if (r == 0) {
+ /* Here, we need to use sscanf() instead of safe_atoul()
+ * as the string lacks the leading "0x". */
+ r = sscanf(domcap, "%lx", &features);
+ if (r == 1) {
r = !!(features & (1U << XENFEAT_dom0));
log_debug("Virtualization XEN, found %s with value %08lx, "
"XENFEAT_dom0 (indicating the 'hardware domain') is%s set.",
/* Detect User-Mode Linux by reading /proc/cpuinfo */
r = read_full_file("/proc/cpuinfo", &cpuinfo_contents, NULL);
+ if (r == -ENOENT) {
+ log_debug("/proc/cpuinfo not found, assuming no UML virtualization.");
+ return VIRTUALIZATION_NONE;
+ }
if (r < 0)
return r;
return VIRTUALIZATION_UML;
}
- log_debug("No virtualization found in /proc/cpuinfo.");
+ log_debug("UML virtualization not found in /proc/cpuinfo.");
return VIRTUALIZATION_NONE;
}
/* Returns a short identifier for the various VM implementations */
int detect_vm(void) {
static thread_local int cached_found = _VIRTUALIZATION_INVALID;
- int r, dmi;
bool other = false;
+ int r, dmi;
if (cached_found >= 0)
return cached_found;
/* We have to use the correct order here:
*
- * -> First try to detect Oracle Virtualbox, even if it uses KVM.
- * -> Second try to detect from cpuid, this will report KVM for
- * whatever software is used even if info in dmi is overwritten.
- * -> Third try to detect from dmi. */
+ * → First, try to detect Oracle Virtualbox, even if it uses KVM, as well as Xen even if it cloaks as Microsoft
+ * Hyper-V.
+ *
+ * → Second, try to detect from CPUID, this will report KVM for whatever software is used even if info in DMI is
+ * overwritten.
+ *
+ * → Third, try to detect from DMI. */
dmi = detect_vm_dmi();
- if (dmi == VIRTUALIZATION_ORACLE) {
+ if (IN_SET(dmi, VIRTUALIZATION_ORACLE, VIRTUALIZATION_XEN)) {
r = dmi;
goto finish;
}
r = detect_vm_cpuid();
if (r < 0)
return r;
- if (r != VIRTUALIZATION_NONE) {
- if (r == VIRTUALIZATION_VM_OTHER)
- other = true;
- else
- goto finish;
- }
+ if (r == VIRTUALIZATION_VM_OTHER)
+ other = true;
+ else if (r != VIRTUALIZATION_NONE)
+ goto finish;
- r = dmi;
- if (r < 0)
- return r;
- if (r != VIRTUALIZATION_NONE) {
- if (r == VIRTUALIZATION_VM_OTHER)
- other = true;
- else
- goto finish;
+ /* Now, let's get back to DMI */
+ if (dmi < 0)
+ return dmi;
+ if (dmi == VIRTUALIZATION_VM_OTHER)
+ other = true;
+ else if (dmi != VIRTUALIZATION_NONE) {
+ r = dmi;
+ goto finish;
}
/* x86 xen will most likely be detected by cpuid. If not (most likely
* because we're not an x86 guest), then we should try the /proc/xen
* directory next. If that's not found, then we check for the high-level
* hypervisor sysfs file.
- */
+ */
r = detect_vm_xen();
if (r < 0)
return r;
- if (r != VIRTUALIZATION_NONE) {
- if (r == VIRTUALIZATION_VM_OTHER)
- other = true;
- else
- goto finish;
- }
+ if (r == VIRTUALIZATION_VM_OTHER)
+ other = true;
+ else if (r != VIRTUALIZATION_NONE)
+ goto finish;
r = detect_vm_hypervisor();
if (r < 0)
return r;
- if (r != VIRTUALIZATION_NONE) {
- if (r == VIRTUALIZATION_VM_OTHER)
- other = true;
- else
- goto finish;
- }
+ if (r == VIRTUALIZATION_VM_OTHER)
+ other = true;
+ else if (r != VIRTUALIZATION_NONE)
+ goto finish;
r = detect_vm_device_tree();
if (r < 0)
return r;
- if (r != VIRTUALIZATION_NONE) {
- if (r == VIRTUALIZATION_VM_OTHER)
- other = true;
- else
- goto finish;
- }
+ if (r == VIRTUALIZATION_VM_OTHER)
+ other = true;
+ else if (r != VIRTUALIZATION_NONE)
+ goto finish;
r = detect_vm_uml();
if (r < 0)
return r;
- if (r != VIRTUALIZATION_NONE) {
- if (r == VIRTUALIZATION_VM_OTHER)
- other = true;
- else
- goto finish;
- }
+ if (r == VIRTUALIZATION_VM_OTHER)
+ other = true;
+ else if (r != VIRTUALIZATION_NONE)
+ goto finish;
r = detect_vm_zvm();
if (r < 0)
* In order to detect the Dom0 as not virtualization we need to
* double-check it */
if (r == VIRTUALIZATION_XEN) {
- int ret = detect_vm_xen_dom0();
- if (ret < 0)
- return ret;
- if (ret > 0)
+ int dom0;
+
+ dom0 = detect_vm_xen_dom0();
+ if (dom0 < 0)
+ return dom0;
+ if (dom0 > 0)
r = VIRTUALIZATION_NONE;
} else if (r == VIRTUALIZATION_NONE && other)
r = VIRTUALIZATION_VM_OTHER;
}
int running_in_chroot(void) {
- int ret;
+ int r;
if (getenv_bool("SYSTEMD_IGNORE_CHROOT") > 0)
return 0;
- ret = files_same("/proc/1/root", "/", 0);
- if (ret < 0)
- return ret;
+ r = files_same("/proc/1/root", "/", 0);
+ if (r < 0)
+ return r;
- return ret == 0;
+ return r == 0;
}
static const char *const virtualization_table[_VIRTUALIZATION_MAX] = {
[VIRTUALIZATION_ZVM] = "zvm",
[VIRTUALIZATION_PARALLELS] = "parallels",
[VIRTUALIZATION_BHYVE] = "bhyve",
+ [VIRTUALIZATION_QNX] = "qnx",
[VIRTUALIZATION_VM_OTHER] = "vm-other",
[VIRTUALIZATION_SYSTEMD_NSPAWN] = "systemd-nspawn",
projects / thirdparty / systemd.git / blobdiff