b92bea5d2a
Before, we would initialize many fields twice: first by filling the structure with zeros, and then a second time with the real values. We can let the compiler do the job for us, avoiding one copy. A downside of this patch is that text gets slightly bigger. This is because all zero() calls are effectively inlined: $ size build/.libs/systemd text data bss dec hex filename before 897737 107300 2560 1007597 f5fed build/.libs/systemd after 897873 107300 2560 1007733 f6075 build/.libs/systemd … actually less than 1‰. A few asserts that the parameter is not null had to be removed. I don't think this changes much, because first, it is quite unlikely for the assert to fail, and second, an immediate SEGV is almost as good as an assert.
275 lines
7.8 KiB
C
275 lines
7.8 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include "util.h"
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#include "virt.h"
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#include "fileio.h"
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/* Returns a short identifier for the various VM implementations */
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int detect_vm(const char **id) {
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#if defined(__i386__) || defined(__x86_64__)
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/* Both CPUID and DMI are x86 specific interfaces... */
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static const char *const dmi_vendors[] = {
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"/sys/class/dmi/id/sys_vendor",
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"/sys/class/dmi/id/board_vendor",
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"/sys/class/dmi/id/bios_vendor"
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};
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static const char dmi_vendor_table[] =
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"QEMU\0" "qemu\0"
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/* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
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"VMware\0" "vmware\0"
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"VMW\0" "vmware\0"
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"Microsoft Corporation\0" "microsoft\0"
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"innotek GmbH\0" "oracle\0"
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"Xen\0" "xen\0"
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"Bochs\0" "bochs\0";
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static const char cpuid_vendor_table[] =
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"XenVMMXenVMM\0" "xen\0"
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"KVMKVMKVM\0" "kvm\0"
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/* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
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"VMwareVMware\0" "vmware\0"
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/* http://msdn.microsoft.com/en-us/library/ff542428.aspx */
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"Microsoft Hv\0" "microsoft\0";
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uint32_t eax, ecx;
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union {
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uint32_t sig32[3];
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char text[13];
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} sig = {};
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unsigned i;
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const char *j, *k;
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bool hypervisor;
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_cleanup_free_ char *hvtype = NULL;
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int r;
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/* Try high-level hypervisor sysfs file first:
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*
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* https://bugs.freedesktop.org/show_bug.cgi?id=61491 */
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r = read_one_line_file("/sys/hypervisor/type", &hvtype);
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if (r >= 0) {
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if (streq(hvtype, "xen")) {
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if (id)
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*id = "xen";
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return 1;
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}
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} else if (r != -ENOENT)
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return r;
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/* http://lwn.net/Articles/301888/ */
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#if defined (__i386__)
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#define REG_a "eax"
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#define REG_b "ebx"
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#elif defined (__amd64__)
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#define REG_a "rax"
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#define REG_b "rbx"
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#endif
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/* First detect whether there is a hypervisor */
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eax = 1;
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__asm__ __volatile__ (
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/* ebx/rbx is being used for PIC! */
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" push %%"REG_b" \n\t"
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" cpuid \n\t"
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" pop %%"REG_b" \n\t"
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: "=a" (eax), "=c" (ecx)
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: "0" (eax)
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);
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hypervisor = !!(ecx & 0x80000000U);
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if (hypervisor) {
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/* There is a hypervisor, see what it is */
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eax = 0x40000000U;
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__asm__ __volatile__ (
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/* ebx/rbx is being used for PIC! */
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" push %%"REG_b" \n\t"
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" cpuid \n\t"
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" mov %%ebx, %1 \n\t"
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" pop %%"REG_b" \n\t"
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: "=a" (eax), "=r" (sig.sig32[0]), "=c" (sig.sig32[1]), "=d" (sig.sig32[2])
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: "0" (eax)
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);
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NULSTR_FOREACH_PAIR(j, k, cpuid_vendor_table)
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if (streq(sig.text, j)) {
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if (id)
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*id = k;
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return 1;
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}
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}
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for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) {
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_cleanup_free_ char *s = NULL;
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const char *found = NULL;
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r = read_one_line_file(dmi_vendors[i], &s);
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if (r < 0) {
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if (r != -ENOENT)
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return r;
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continue;
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}
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NULSTR_FOREACH_PAIR(j, k, dmi_vendor_table)
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if (startswith(s, j))
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found = k;
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if (found) {
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if (id)
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*id = found;
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return 1;
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}
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}
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if (hypervisor || hvtype) {
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if (id)
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*id = "other";
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return 1;
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}
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#endif
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return 0;
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}
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int detect_container(const char **id) {
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char *e = NULL;
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int r;
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/* Unfortunately many of these operations require root access
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* in one way or another */
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r = running_in_chroot();
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if (r < 0)
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return r;
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if (r > 0) {
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if (id)
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*id = "chroot";
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return 1;
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}
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/* /proc/vz exists in container and outside of the container,
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* /proc/bc only outside of the container. */
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if (access("/proc/vz", F_OK) >= 0 &&
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access("/proc/bc", F_OK) < 0) {
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if (id)
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*id = "openvz";
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return 1;
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}
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r = getenv_for_pid(1, "container", &e);
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if (r <= 0)
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return r;
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/* We only recognize a selected few here, since we want to
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* enforce a redacted namespace */
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if (streq(e, "lxc")) {
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if (id)
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*id = "lxc";
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} else if (streq(e, "lxc-libvirt")) {
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if (id)
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*id = "lxc-libvirt";
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} else if (streq(e, "systemd-nspawn")) {
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if (id)
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*id = "systemd-nspawn";
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} else {
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if (id)
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*id = "other";
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}
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free(e);
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return r;
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}
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/* Returns a short identifier for the various VM/container implementations */
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Virtualization detect_virtualization(const char **id) {
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static __thread Virtualization cached_virt = _VIRTUALIZATION_INVALID;
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static __thread const char *cached_id = NULL;
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const char *_id;
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int r;
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Virtualization v;
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if (_likely_(cached_virt >= 0)) {
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if (id && cached_virt > 0)
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*id = cached_id;
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return cached_virt;
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}
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r = detect_container(&_id);
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if (r < 0) {
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v = r;
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goto finish;
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} else if (r > 0) {
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v = VIRTUALIZATION_CONTAINER;
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goto finish;
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}
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r = detect_vm(&_id);
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if (r < 0) {
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v = r;
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goto finish;
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} else if (r > 0) {
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v = VIRTUALIZATION_VM;
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goto finish;
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}
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v = VIRTUALIZATION_NONE;
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finish:
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if (v > 0) {
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cached_id = _id;
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if (id)
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*id = _id;
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}
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if (v >= 0)
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cached_virt = v;
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return v;
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}
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