438 lines
13 KiB
C
438 lines
13 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
|
|
|
|
/***
|
|
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/>.
|
|
***/
|
|
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include "fileio.h"
|
|
#include "process-util.h"
|
|
#include "string-table.h"
|
|
#include "string-util.h"
|
|
#include "util.h"
|
|
#include "virt.h"
|
|
|
|
static int detect_vm_cpuid(void) {
|
|
|
|
/* Both CPUID and DMI are x86 specific interfaces... */
|
|
#if defined(__i386__) || defined(__x86_64__)
|
|
|
|
static const struct {
|
|
const char *cpuid;
|
|
int id;
|
|
} cpuid_vendor_table[] = {
|
|
{ "XenVMMXenVMM", VIRTUALIZATION_XEN },
|
|
{ "KVMKVMKVM", VIRTUALIZATION_KVM },
|
|
/* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
|
|
{ "VMwareVMware", VIRTUALIZATION_VMWARE },
|
|
/* http://msdn.microsoft.com/en-us/library/ff542428.aspx */
|
|
{ "Microsoft Hv", VIRTUALIZATION_MICROSOFT },
|
|
};
|
|
|
|
uint32_t eax, ecx;
|
|
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)
|
|
);
|
|
|
|
hypervisor = !!(ecx & 0x80000000U);
|
|
|
|
if (hypervisor) {
|
|
union {
|
|
uint32_t sig32[3];
|
|
char text[13];
|
|
} sig = {};
|
|
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)
|
|
);
|
|
|
|
for (j = 0; j < ELEMENTSOF(cpuid_vendor_table); j ++)
|
|
if (streq(sig.text, cpuid_vendor_table[j].cpuid))
|
|
return cpuid_vendor_table[j].id;
|
|
|
|
return VIRTUALIZATION_VM_OTHER;
|
|
}
|
|
#endif
|
|
|
|
return VIRTUALIZATION_NONE;
|
|
}
|
|
|
|
static int detect_vm_device_tree(void) {
|
|
#if defined(__arm__) || defined(__aarch64__) || defined(__powerpc__) || defined(__powerpc64__)
|
|
_cleanup_free_ char *hvtype = NULL;
|
|
int r;
|
|
|
|
r = read_one_line_file("/proc/device-tree/hypervisor/compatible", &hvtype);
|
|
if (r == -ENOENT) {
|
|
_cleanup_closedir_ DIR *dir = NULL;
|
|
struct dirent *dent;
|
|
|
|
dir = opendir("/proc/device-tree");
|
|
if (!dir) {
|
|
if (errno == ENOENT)
|
|
return VIRTUALIZATION_NONE;
|
|
return -errno;
|
|
}
|
|
|
|
FOREACH_DIRENT(dent, dir, return -errno)
|
|
if (strstr(dent->d_name, "fw-cfg"))
|
|
return VIRTUALIZATION_QEMU;
|
|
|
|
return VIRTUALIZATION_NONE;
|
|
} else if (r < 0)
|
|
return r;
|
|
|
|
if (streq(hvtype, "linux,kvm"))
|
|
return VIRTUALIZATION_KVM;
|
|
else if (strstr(hvtype, "xen"))
|
|
return VIRTUALIZATION_XEN;
|
|
else
|
|
return VIRTUALIZATION_VM_OTHER;
|
|
#else
|
|
return VIRTUALIZATION_NONE;
|
|
#endif
|
|
}
|
|
|
|
static int detect_vm_dmi(void) {
|
|
|
|
/* Both CPUID and DMI are x86 specific interfaces... */
|
|
#if defined(__i386__) || defined(__x86_64__)
|
|
|
|
static const char *const dmi_vendors[] = {
|
|
"/sys/class/dmi/id/sys_vendor",
|
|
"/sys/class/dmi/id/board_vendor",
|
|
"/sys/class/dmi/id/bios_vendor"
|
|
};
|
|
|
|
static const struct {
|
|
const char *vendor;
|
|
int id;
|
|
} dmi_vendor_table[] = {
|
|
{ "QEMU", VIRTUALIZATION_QEMU },
|
|
/* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
|
|
{ "VMware", VIRTUALIZATION_VMWARE },
|
|
{ "VMW", VIRTUALIZATION_VMWARE },
|
|
{ "innotek GmbH", VIRTUALIZATION_ORACLE },
|
|
{ "Xen", VIRTUALIZATION_XEN },
|
|
{ "Bochs", VIRTUALIZATION_BOCHS },
|
|
{ "Parallels", VIRTUALIZATION_PARALLELS },
|
|
};
|
|
unsigned i;
|
|
int r;
|
|
|
|
for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) {
|
|
_cleanup_free_ char *s = NULL;
|
|
unsigned j;
|
|
|
|
r = read_one_line_file(dmi_vendors[i], &s);
|
|
if (r < 0) {
|
|
if (r == -ENOENT)
|
|
continue;
|
|
|
|
return r;
|
|
}
|
|
|
|
for (j = 0; j < ELEMENTSOF(dmi_vendor_table); j++)
|
|
if (startswith(s, dmi_vendor_table[j].vendor))
|
|
return dmi_vendor_table[j].id;
|
|
}
|
|
#endif
|
|
|
|
return VIRTUALIZATION_NONE;
|
|
}
|
|
|
|
static int detect_vm_xen(void) {
|
|
_cleanup_free_ char *domcap = NULL;
|
|
char *cap, *i;
|
|
int r;
|
|
|
|
r = read_one_line_file("/proc/xen/capabilities", &domcap);
|
|
if (r == -ENOENT)
|
|
return VIRTUALIZATION_NONE;
|
|
|
|
i = domcap;
|
|
while ((cap = strsep(&i, ",")))
|
|
if (streq(cap, "control_d"))
|
|
break;
|
|
|
|
return cap ? VIRTUALIZATION_NONE : VIRTUALIZATION_XEN;
|
|
}
|
|
|
|
static int detect_vm_hypervisor(void) {
|
|
_cleanup_free_ char *hvtype = NULL;
|
|
int r;
|
|
|
|
r = read_one_line_file("/sys/hypervisor/type", &hvtype);
|
|
if (r == -ENOENT)
|
|
return VIRTUALIZATION_NONE;
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (streq(hvtype, "xen"))
|
|
return VIRTUALIZATION_XEN;
|
|
else
|
|
return VIRTUALIZATION_VM_OTHER;
|
|
}
|
|
|
|
static int detect_vm_uml(void) {
|
|
_cleanup_free_ char *cpuinfo_contents = NULL;
|
|
int r;
|
|
|
|
/* Detect User-Mode Linux by reading /proc/cpuinfo */
|
|
r = read_full_file("/proc/cpuinfo", &cpuinfo_contents, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
if (strstr(cpuinfo_contents, "\nvendor_id\t: User Mode Linux\n"))
|
|
return VIRTUALIZATION_UML;
|
|
|
|
return VIRTUALIZATION_NONE;
|
|
}
|
|
|
|
static int detect_vm_zvm(void) {
|
|
|
|
#if defined(__s390__)
|
|
_cleanup_free_ char *t = NULL;
|
|
int r;
|
|
|
|
r = get_proc_field("/proc/sysinfo", "VM00 Control Program", WHITESPACE, &t);
|
|
if (r == -ENOENT)
|
|
return VIRTUALIZATION_NONE;
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (streq(t, "z/VM"))
|
|
return VIRTUALIZATION_ZVM;
|
|
else
|
|
return VIRTUALIZATION_KVM;
|
|
#else
|
|
return VIRTUALIZATION_NONE;
|
|
#endif
|
|
}
|
|
|
|
/* Returns a short identifier for the various VM implementations */
|
|
int detect_vm(void) {
|
|
static thread_local int cached_found = _VIRTUALIZATION_INVALID;
|
|
int r;
|
|
|
|
if (cached_found >= 0)
|
|
return cached_found;
|
|
|
|
/* Try xen capabilities file first, if not found try
|
|
* high-level hypervisor sysfs file:
|
|
*
|
|
* https://bugs.freedesktop.org/show_bug.cgi?id=77271 */
|
|
|
|
r = detect_vm_xen();
|
|
if (r < 0)
|
|
return r;
|
|
if (r != VIRTUALIZATION_NONE)
|
|
goto finish;
|
|
|
|
r = detect_vm_dmi();
|
|
if (r < 0)
|
|
return r;
|
|
if (r != VIRTUALIZATION_NONE)
|
|
goto finish;
|
|
|
|
r = detect_vm_cpuid();
|
|
if (r < 0)
|
|
return r;
|
|
if (r != VIRTUALIZATION_NONE)
|
|
goto finish;
|
|
|
|
r = detect_vm_hypervisor();
|
|
if (r < 0)
|
|
return r;
|
|
if (r != VIRTUALIZATION_NONE)
|
|
goto finish;
|
|
|
|
r = detect_vm_device_tree();
|
|
if (r < 0)
|
|
return r;
|
|
if (r != VIRTUALIZATION_NONE)
|
|
goto finish;
|
|
|
|
r = detect_vm_uml();
|
|
if (r < 0)
|
|
return r;
|
|
if (r != VIRTUALIZATION_NONE)
|
|
goto finish;
|
|
|
|
r = detect_vm_zvm();
|
|
if (r < 0)
|
|
return r;
|
|
|
|
finish:
|
|
cached_found = r;
|
|
return r;
|
|
}
|
|
|
|
int detect_container(void) {
|
|
|
|
static const struct {
|
|
const char *value;
|
|
int id;
|
|
} value_table[] = {
|
|
{ "lxc", VIRTUALIZATION_LXC },
|
|
{ "lxc-libvirt", VIRTUALIZATION_LXC_LIBVIRT },
|
|
{ "systemd-nspawn", VIRTUALIZATION_SYSTEMD_NSPAWN },
|
|
{ "docker", VIRTUALIZATION_DOCKER },
|
|
};
|
|
|
|
static thread_local int cached_found = _VIRTUALIZATION_INVALID;
|
|
_cleanup_free_ char *m = NULL;
|
|
const char *e = NULL;
|
|
unsigned j;
|
|
int r;
|
|
|
|
if (cached_found >= 0)
|
|
return cached_found;
|
|
|
|
/* /proc/vz exists in container and outside of the container,
|
|
* /proc/bc only outside of the container. */
|
|
if (access("/proc/vz", F_OK) >= 0 &&
|
|
access("/proc/bc", F_OK) < 0) {
|
|
r = VIRTUALIZATION_OPENVZ;
|
|
goto finish;
|
|
}
|
|
|
|
if (getpid() == 1) {
|
|
/* If we are PID 1 we can just check our own
|
|
* environment variable */
|
|
|
|
e = getenv("container");
|
|
if (isempty(e)) {
|
|
r = VIRTUALIZATION_NONE;
|
|
goto finish;
|
|
}
|
|
} else {
|
|
|
|
/* Otherwise, PID 1 dropped this information into a
|
|
* file in /run. This is better than accessing
|
|
* /proc/1/environ, since we don't need CAP_SYS_PTRACE
|
|
* for that. */
|
|
|
|
r = read_one_line_file("/run/systemd/container", &m);
|
|
if (r == -ENOENT) {
|
|
|
|
/* Fallback for cases where PID 1 was not
|
|
* systemd (for example, cases where
|
|
* init=/bin/sh is used. */
|
|
|
|
r = getenv_for_pid(1, "container", &m);
|
|
if (r <= 0) {
|
|
|
|
/* If that didn't work, give up,
|
|
* assume no container manager.
|
|
*
|
|
* Note: This means we still cannot
|
|
* detect containers if init=/bin/sh
|
|
* is passed but privileges dropped,
|
|
* as /proc/1/environ is only readable
|
|
* with privileges. */
|
|
|
|
r = VIRTUALIZATION_NONE;
|
|
goto finish;
|
|
}
|
|
}
|
|
if (r < 0)
|
|
return r;
|
|
|
|
e = m;
|
|
}
|
|
|
|
for (j = 0; j < ELEMENTSOF(value_table); j++)
|
|
if (streq(e, value_table[j].value)) {
|
|
r = value_table[j].id;
|
|
goto finish;
|
|
}
|
|
|
|
r = VIRTUALIZATION_NONE;
|
|
|
|
finish:
|
|
cached_found = r;
|
|
return r;
|
|
}
|
|
|
|
int detect_virtualization(void) {
|
|
int r;
|
|
|
|
r = detect_container();
|
|
if (r != 0)
|
|
return r;
|
|
|
|
return detect_vm();
|
|
}
|
|
|
|
static const char *const virtualization_table[_VIRTUALIZATION_MAX] = {
|
|
[VIRTUALIZATION_NONE] = "none",
|
|
[VIRTUALIZATION_KVM] = "kvm",
|
|
[VIRTUALIZATION_QEMU] = "qemu",
|
|
[VIRTUALIZATION_BOCHS] = "bochs",
|
|
[VIRTUALIZATION_XEN] = "xen",
|
|
[VIRTUALIZATION_UML] = "uml",
|
|
[VIRTUALIZATION_VMWARE] = "vmware",
|
|
[VIRTUALIZATION_ORACLE] = "oracle",
|
|
[VIRTUALIZATION_MICROSOFT] = "microsoft",
|
|
[VIRTUALIZATION_ZVM] = "zvm",
|
|
[VIRTUALIZATION_PARALLELS] = "parallels",
|
|
[VIRTUALIZATION_VM_OTHER] = "vm-other",
|
|
|
|
[VIRTUALIZATION_SYSTEMD_NSPAWN] = "systemd-nspawn",
|
|
[VIRTUALIZATION_LXC_LIBVIRT] = "lxc-libvirt",
|
|
[VIRTUALIZATION_LXC] = "lxc",
|
|
[VIRTUALIZATION_OPENVZ] = "openvz",
|
|
[VIRTUALIZATION_DOCKER] = "docker",
|
|
[VIRTUALIZATION_CONTAINER_OTHER] = "container-other",
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(virtualization, int);
|