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Diffstat (limited to 'src/libbasic/virt.c')
| -rw-r--r-- | src/libbasic/virt.c | 462 |
1 files changed, 462 insertions, 0 deletions
diff --git a/src/libbasic/virt.c b/src/libbasic/virt.c new file mode 100644 index 0000000000..19b6318e3d --- /dev/null +++ b/src/libbasic/virt.c @@ -0,0 +1,462 @@ +/*** + 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 <stdint.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "alloc-util.h" +#include "dirent-util.h" +#include "fd-util.h" +#include "fileio.h" +#include "macro.h" +#include "process-util.h" +#include "stat-util.h" +#include "string-table.h" +#include "string-util.h" +#include "virt.h" + +static int detect_vm_cpuid(void) { + + /* CPUID is an x86 specific interface. */ +#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) { +#if defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__aarch64__) + + static const char *const dmi_vendors[] = { + "/sys/class/dmi/id/product_name", /* Test this before sys_vendor to detect KVM over QEMU */ + "/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[] = { + { "KVM", VIRTUALIZATION_KVM }, + { "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; + + /* We have to use the correct order here: + * Some virtualization technologies do use KVM hypervisor but are + * expected to be detected as something else. So detect DMI first. + * + * An example is Virtualbox since version 5.0, which uses KVM backend. + * Detection via DMI works corretly, the CPU ID would find KVM + * only. */ + 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; + + /* 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 xen capabilities + * file next. If that's not found, then we check for the 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_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 }, + { "rkt", VIRTUALIZATION_RKT }, + }; + + 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_CONTAINER_OTHER; + +finish: + cached_found = r; + return r; +} + +int detect_virtualization(void) { + int r; + + r = detect_container(); + if (r != 0) + return r; + + return detect_vm(); +} + +int running_in_chroot(void) { + int ret; + + ret = files_same("/proc/1/root", "/"); + if (ret < 0) + return ret; + + return ret == 0; +} + +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_RKT] = "rkt", + [VIRTUALIZATION_CONTAINER_OTHER] = "container-other", +}; + +DEFINE_STRING_TABLE_LOOKUP(virtualization, int); |