diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/hypervisor_vendor.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/src/hypervisor_vendor.c b/src/hypervisor_vendor.c new file mode 100644 index 00000000..eade6c66 --- /dev/null +++ b/src/hypervisor_vendor.c @@ -0,0 +1,193 @@ +/* + * Identify hypervisor vendor + * + * This is based on code from lscpu and virt-what. Unfortunately, neither + * of those is sufficient. lscpu doesn't detect many VM's, + * and virt-what is a shell script that has to be run as root. + * + * **** License **** + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program 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 + * General Public License for more details. + * # + * A copy of the GNU General Public License is available as + * `/usr/share/common-licenses/GPL' in the Debian GNU/Linux distribution + * or on the World Wide Web at `http://www.gnu.org/copyleft/gpl.html'. + * You can also obtain it by writing to the Free Software Foundation, + * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, + * MA 02110-1301, USA. + * + * Portions created by Vyatta are Copyright (C) 2011 Vyatta, Inc. + * All Rights Reserved. + */ + +#include <stdio.h> +#include <string.h> +#include <unistd.h> + +#define PROC_XEN "/proc/xen" +#define PROC_XENCAP PROC_XEN "/capabilities" +#define PROC_PCIDEVS "/proc/bus/pci/devices" +#define SYS_HYPERVISOR "/sys/hypervisor/type" +#define SYS_DMI_VENDOR "/sys/class/dmi/id/sys_vendor" + +/* + * This CPUID leaf returns the information about the hypervisor. + * EAX : maximum input value for CPUID supported by the hypervisor. + * EBX, ECX, EDX : Hypervisor vendor ID signature. E.g. VMwareVMware. + */ +#define HYPERVISOR_INFO_LEAF 0x40000000 + +static inline void +cpuid(unsigned int op, unsigned int *eax, unsigned int *ebx, + unsigned int *ecx, unsigned int *edx) +{ + __asm__( +#if defined(__PIC__) && defined(__i386__) + /* x86 PIC cannot clobber ebx -- gcc bitches */ + "pushl %%ebx;" + "cpuid;" + "movl %%ebx, %%esi;" + "popl %%ebx;" + : "=S" (*ebx), +#else + "cpuid;" + : "=b" (*ebx), +#endif + "=a" (*eax), + "=c" (*ecx), + "=d" (*edx) + : "1" (op), "c"(0)); +} + + +/* Use CPUID instruction to find hypervisor vendor. + * This is the preferred method, but doesn't work with older + * hypervisors. + */ +static const char *get_hypervisor_cpuid(void) +{ + unsigned int eax = 0, ebx = 0, ecx = 0, edx = 0; + char hyper_vendor_id[13]; + + memset(hyper_vendor_id, 0, sizeof(hyper_vendor_id)); + + cpuid(HYPERVISOR_INFO_LEAF, &eax, &ebx, &ecx, &edx); + memcpy(hyper_vendor_id + 0, &ebx, 4); + memcpy(hyper_vendor_id + 4, &ecx, 4); + memcpy(hyper_vendor_id + 8, &edx, 4); + hyper_vendor_id[12] = '\0'; + + if (!hyper_vendor_id[0]) + return NULL; + + else if (!strncmp("XenVMMXenVMM", hyper_vendor_id, 12)) + return "Xen hvm"; + else if (!strncmp("KVMKVMKVM", hyper_vendor_id, 9)) + return "KVM"; + else if (!strncmp("Microsoft Hv", hyper_vendor_id, 12)) + return "Microsoft HyperV"; + else if (!strncmp("VMwareVMware", hyper_vendor_id, 12)) + return "VMware"; + else + return NULL; +} + +/* Use DMI vendor information */ +static const char *get_hypervisor_dmi(void) +{ + FILE *f = fopen(SYS_DMI_VENDOR, "r"); + char vendor_id[128]; + + if (!f) + return NULL; + + if (fgets(vendor_id, sizeof(vendor_id), f) == NULL) { + fclose(f); + return NULL; + } + fclose(f); + + if (!strncmp(vendor_id, "VMware", 6)) + return "VMware"; + /* Note: Hyper-V has same DMI, but different CPUID */ + else if (!strncmp(vendor_id, "Microsoft Corporation", 21)) + return "VirtualPC"; + else if (!strncmp(vendor_id, "innotek GmbH", 12)) + return "VirtualBox"; + else if (!strncmp(vendor_id, "Parallels", 9)) + return "Parallels"; + else + return NULL; +} + +static int +has_pci_device(int vendor, int device) +{ + FILE *f; + int num, fn, ven, dev; + int res = 1; + + f = fopen(PROC_PCIDEVS, "r"); + if (!f) + return 0; + + /* for more details about bus/pci/devices format see + * drivers/pci/proc.c in linux kernel + */ + while(fscanf(f, "%02x%02x\t%04x%04x\t%*[^\n]", + &num, &fn, &ven, &dev) == 4) { + + if (ven == vendor && dev == device) + goto found; + } + + res = 0; +found: + fclose(f); + return res; +} + +int main(int argc, char **argv) +{ + FILE *f; + const char *hvm; + char buf[256]; + + hvm = get_hypervisor_cpuid(); + if (hvm) + printf("%s\n", hvm); + + hvm = get_hypervisor_dmi(); + if (hvm) + printf("%s\n", hvm); + + /* Grotty code to look for old Xen */ + else if ((f = fopen(PROC_XENCAP, "r")) != NULL) { + int dom0 = 0; + + if (fscanf(f, "%s", buf) == 1 && + !strcmp(buf, "control_d")) + dom0 = 1; + printf("Xen %s\n", dom0 ? "dom0" : "domU"); + fclose(f); + } + else if ((f = fopen(SYS_HYPERVISOR, "r")) != NULL) { + if (fgets(buf, sizeof(buf), f) != NULL + && !strncmp(buf, "xen", 3)) + printf("Xen\n"); + fclose(f); + } + else if (has_pci_device(0x5853, 0x0001)) { + /* Xen full-virt on non-x86_64 */ + printf("Xen full\n"); + } + + /* print nothing if in real mode */ + return 0; +} |