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virt: use string table to detect VM or container

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This commit is contained in:
Yu Watanabe 2020-01-07 11:49:39 +09:00
parent 0e97a910a6
commit 735ea55f5c
1 changed files with 37 additions and 44 deletions
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81
src/basic/virt.c
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@ -20,29 +20,28 @@
#include "string-util.h"
#include "virt.h"
static const char *const vm_table[_VIRTUALIZATION_MAX] = {
[VIRTUALIZATION_XEN] = "XenVMMXenVMM",
[VIRTUALIZATION_KVM] = "KVMKVMKVM",
[VIRTUALIZATION_QEMU] = "TCGTCGTCGTCG",
/* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
[VIRTUALIZATION_VMWARE] = "VMwareVMware",
/* https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/reference/tlfs */
[VIRTUALIZATION_MICROSOFT] = "Microsoft Hv",
/* https://wiki.freebsd.org/bhyve */
[VIRTUALIZATION_BHYVE] = "bhyve bhyve ",
[VIRTUALIZATION_QNX] = "QNXQVMBSQG",
/* https://projectacrn.org */
[VIRTUALIZATION_ACRN] = "ACRNACRNACRN",
};
DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(vm, int);
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 },
{ "TCGTCGTCGTCG", VIRTUALIZATION_QEMU },
/* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
{ "VMwareVMware", VIRTUALIZATION_VMWARE },
/* https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/reference/tlfs */
{ "Microsoft Hv", VIRTUALIZATION_MICROSOFT },
/* https://wiki.freebsd.org/bhyve */
{ "bhyve bhyve ", VIRTUALIZATION_BHYVE },
{ "QNXQVMBSQG", VIRTUALIZATION_QNX },
/* https://projectacrn.org */
{ "ACRNACRNACRN", VIRTUALIZATION_ACRN },
};
uint32_t eax, ebx, ecx, edx;
bool hypervisor;
@ -59,7 +58,7 @@ static int detect_vm_cpuid(void) {
uint32_t sig32[3];
char text[13];
} sig = {};
unsigned j;
int v;
/* There is a hypervisor, see what it is */
__cpuid(0x40000000U, eax, ebx, ecx, edx);
@ -70,11 +69,11 @@ static int detect_vm_cpuid(void) {
log_debug("Virtualization found, CPUID=%s", sig.text);
for (j = 0; j < ELEMENTSOF(cpuid_vendor_table); j ++)
if (streq(sig.text, cpuid_vendor_table[j].cpuid))
return cpuid_vendor_table[j].id;
v = vm_from_string(sig.text);
if (v < 0)
return VIRTUALIZATION_VM_OTHER;
return VIRTUALIZATION_VM_OTHER;
return v;
}
#endif
log_debug("No virtualization found in CPUID");
@ -432,25 +431,23 @@ finish:
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 },
{ "podman", VIRTUALIZATION_PODMAN },
{ "rkt", VIRTUALIZATION_RKT },
{ "wsl", VIRTUALIZATION_WSL },
};
static const char *const container_table[_VIRTUALIZATION_MAX] = {
[VIRTUALIZATION_LXC] = "lxc",
[VIRTUALIZATION_LXC_LIBVIRT] = "lxc-libvirt",
[VIRTUALIZATION_SYSTEMD_NSPAWN] = "systemd-nspawn",
[VIRTUALIZATION_DOCKER] = "docker",
[VIRTUALIZATION_PODMAN] = "podman",
[VIRTUALIZATION_RKT] = "rkt",
[VIRTUALIZATION_WSL] = "wsl",
};
DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(container, int);
int detect_container(void) {
static thread_local int cached_found = _VIRTUALIZATION_INVALID;
_cleanup_free_ char *m = NULL;
_cleanup_free_ char *o = NULL;
const char *e = NULL;
unsigned j;
int r;
if (cached_found >= 0)
@ -532,13 +529,9 @@ int detect_container(void) {
goto finish;
translate_name:
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;
r = container_from_string(e);
if (r < 0)
r = VIRTUALIZATION_CONTAINER_OTHER;
finish:
log_debug("Found container virtualization %s.", virtualization_to_string(r));