| /*-*- 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 <string.h> |
| #include <errno.h> |
| #include <unistd.h> |
| |
| #include "util.h" |
| #include "virt.h" |
| #include "fileio.h" |
| |
| static int detect_vm_cpuid(const char **_id) { |
| |
| /* Both CPUID and DMI are x86 specific interfaces... */ |
| #if defined(__i386__) || defined(__x86_64__) |
| |
| static const char cpuid_vendor_table[] = |
| "XenVMMXenVMM\0" "xen\0" |
| "KVMKVMKVM\0" "kvm\0" |
| /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */ |
| "VMwareVMware\0" "vmware\0" |
| /* http://msdn.microsoft.com/en-us/library/ff542428.aspx */ |
| "Microsoft Hv\0" "microsoft\0"; |
| |
| uint32_t eax, ecx; |
| union { |
| uint32_t sig32[3]; |
| char text[13]; |
| } sig = {}; |
| const char *j, *k; |
| 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) { |
| |
| /* 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) |
| ); |
| |
| NULSTR_FOREACH_PAIR(j, k, cpuid_vendor_table) |
| if (streq(sig.text, j)) { |
| *_id = k; |
| return 1; |
| } |
| |
| *_id = "other"; |
| return 0; |
| } |
| #endif |
| |
| return 0; |
| } |
| |
| static int detect_vm_dmi(const char **_id) { |
| |
| /* 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 char dmi_vendor_table[] = |
| "QEMU\0" "qemu\0" |
| /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */ |
| "VMware\0" "vmware\0" |
| "VMW\0" "vmware\0" |
| "innotek GmbH\0" "oracle\0" |
| "Xen\0" "xen\0" |
| "Bochs\0" "bochs\0"; |
| unsigned i; |
| |
| for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) { |
| _cleanup_free_ char *s = NULL; |
| const char *j, *k; |
| int r; |
| |
| r = read_one_line_file(dmi_vendors[i], &s); |
| if (r < 0) { |
| if (r != -ENOENT) |
| return r; |
| |
| continue; |
| } |
| |
| NULSTR_FOREACH_PAIR(j, k, dmi_vendor_table) |
| if (startswith(s, j)) { |
| *_id = k; |
| return 1; |
| } |
| } |
| #endif |
| |
| return 0; |
| } |
| |
| /* Returns a short identifier for the various VM implementations */ |
| int detect_vm(const char **id) { |
| _cleanup_free_ char *hvtype = NULL, *cpuinfo_contents = NULL; |
| static thread_local int cached_found = -1; |
| static thread_local const char *cached_id = NULL; |
| const char *_id = NULL; |
| int r; |
| |
| if (_likely_(cached_found >= 0)) { |
| |
| if (id) |
| *id = cached_id; |
| |
| return cached_found; |
| } |
| |
| /* Try high-level hypervisor sysfs file first: |
| * |
| * https://bugs.freedesktop.org/show_bug.cgi?id=61491 */ |
| r = read_one_line_file("/sys/hypervisor/type", &hvtype); |
| if (r >= 0) { |
| if (streq(hvtype, "xen")) { |
| _id = "xen"; |
| r = 1; |
| goto finish; |
| } |
| } else if (r != -ENOENT) |
| return r; |
| |
| /* this will set _id to "other" and return 0 for unknown hypervisors */ |
| r = detect_vm_cpuid(&_id); |
| if (r != 0) |
| goto finish; |
| |
| r = detect_vm_dmi(&_id); |
| if (r != 0) |
| goto finish; |
| |
| if (_id) { |
| /* "other" */ |
| r = 1; |
| goto finish; |
| } |
| |
| /* 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")) { |
| _id = "uml"; |
| r = 1; |
| goto finish; |
| } |
| |
| r = 0; |
| |
| finish: |
| cached_found = r; |
| |
| cached_id = _id; |
| if (id) |
| *id = _id; |
| |
| return r; |
| } |
| |
| int detect_container(const char **id) { |
| |
| static thread_local int cached_found = -1; |
| static thread_local const char *cached_id = NULL; |
| |
| _cleanup_free_ char *e = NULL; |
| const char *_id = NULL; |
| int r; |
| |
| if (_likely_(cached_found >= 0)) { |
| |
| if (id) |
| *id = cached_id; |
| |
| return cached_found; |
| } |
| |
| /* Unfortunately many of these operations require root access |
| * in one way or another */ |
| |
| r = running_in_chroot(); |
| if (r < 0) |
| return r; |
| if (r > 0) { |
| _id = "chroot"; |
| goto finish; |
| } |
| |
| /* /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) { |
| _id = "openvz"; |
| r = 1; |
| goto finish; |
| } |
| |
| r = getenv_for_pid(1, "container", &e); |
| if (r < 0) |
| return r; |
| if (r == 0) |
| goto finish; |
| |
| /* We only recognize a selected few here, since we want to |
| * enforce a redacted namespace */ |
| if (streq(e, "lxc")) |
| _id ="lxc"; |
| else if (streq(e, "lxc-libvirt")) |
| _id = "lxc-libvirt"; |
| else if (streq(e, "systemd-nspawn")) |
| _id = "systemd-nspawn"; |
| else |
| _id = "other"; |
| |
| finish: |
| cached_found = r; |
| |
| cached_id = _id; |
| if (id) |
| *id = _id; |
| |
| return r; |
| } |
| |
| /* Returns a short identifier for the various VM/container implementations */ |
| int detect_virtualization(const char **id) { |
| int r; |
| |
| r = detect_container(id); |
| if (r < 0) |
| return r; |
| if (r > 0) |
| return VIRTUALIZATION_CONTAINER; |
| |
| r = detect_vm(id); |
| if (r < 0) |
| return r; |
| if (r > 0) |
| return VIRTUALIZATION_VM; |
| |
| return VIRTUALIZATION_NONE; |
| } |