From c8b64f6d7770d62065bdc4fa5c4f80cc2326e203 Mon Sep 17 00:00:00 2001 From: Karel Zak Date: Wed, 1 Oct 2008 01:29:32 +0200 Subject: lscpu: add Hypervisor detection This patch adds two new fields: * "Hypervisor vendor" -- based on CPUID and hypervisor specific PCI devices. lscpu(1) supports KVM, XEN, Microsoft HV now. * "Virtualization type" - "none" = Xen dom0 - "full" = full virtualization (KVM, Xen, ...) - "para" = Xen paravirtualization Co-Author: Ky Srinivasan Signed-off-by: Karel Zak --- sys-utils/lscpu.c | 184 ++++++++++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 164 insertions(+), 20 deletions(-) (limited to 'sys-utils/lscpu.c') diff --git a/sys-utils/lscpu.c b/sys-utils/lscpu.c index d6bb8b9b3..82972b38a 100644 --- a/sys-utils/lscpu.c +++ b/sys-utils/lscpu.c @@ -38,8 +38,10 @@ /* /sys paths */ #define _PATH_SYS_SYSTEM "sys/devices/system" #define _PATH_SYS_CPU0 _PATH_SYS_SYSTEM "/cpu/cpu0" -#define _PATH_PROC_XENCAP "proc/xen/capabilities" +#define _PATH_PROC_XEN "proc/xen" +#define _PATH_PROC_XENCAP _PATH_PROC_XEN "/capabilities" #define _PATH_PROC_CPUINFO "proc/cpuinfo" +#define _PATH_PROC_PCIDEVS "proc/bus/pci/devices" int have_topology; int have_cache; @@ -52,6 +54,33 @@ struct ca_desc { int camap; }; +/* virtualization types */ +enum { + VIRT_NONE = 0, + VIRT_PARA, + VIRT_FULL +}; +const char *virt_types[] = { + [VIRT_NONE] = N_("none"), + [VIRT_PARA] = N_("para"), + [VIRT_FULL] = N_("full") +}; + +/* hypervisor vendors */ +enum { + HYPER_NONE = 0, + HYPER_XEN, + HYPER_KVM, + HYPER_MSHV +}; +const char *hv_vendors[] = { + [HYPER_NONE] = NULL, + [HYPER_XEN] = "Xen", + [HYPER_KVM] = "KVM", + [HYPER_MSHV] = "Microsoft" +}; + + /* CPU(s) description */ struct cpu_desc { /* counters */ @@ -67,6 +96,9 @@ struct cpu_desc { char *vendor; char *family; char *model; + char *virtflag; /* virtualization flag (vmx, svm) */ + int hyper; /* hypervisor vendor ID */ + int virtype; /* VIRT_PARA|FULL|NONE ? */ /* caches */ struct ca_desc cache[CACHE_MAX]; @@ -246,9 +278,130 @@ read_basicinfo(struct cpu_desc *cpu) else continue; } + + if (cpu->flags) { + snprintf(buf, sizeof(buf), " %s ", cpu->flags); + if (strstr(buf, " svm ")) + cpu->virtflag = strdup("svm"); + else if (strstr(buf, " vmx ")) + cpu->virtflag = strdup("vmx"); + } + fclose(fp); } +static int +has_pci_device(int vendor, int device) +{ + FILE *f; + int num, fn, ven, dev; + int res = 1; + + f = fopen(_PATH_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; +} + +#if defined(__x86_64__) || defined(__i386__) + +/* + * 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__("cpuid" + : "=a" (*eax), + "=b" (*ebx), + "=c" (*ecx), + "=d" (*edx) + : "0" (op), "c"(0)); +} + +static void +read_hypervisor_cpuid(struct cpu_desc *cpu) +{ + 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; + + if (!strncmp("XenVMMXenVMM", hyper_vendor_id, 12)) + cpu->hyper = HYPER_XEN; + else if (!strncmp("KVMKVMKVM", hyper_vendor_id, 9)) + cpu->hyper = HYPER_KVM; + else if (!strncmp("Microsoft Hv", hyper_vendor_id, 12)) + cpu->hyper = HYPER_MSHV; +} + +#else /* ! __x86_64__ */ +static void +read_hypervisor_cpuid(struct cpu_desc *cpu) +{ +} +#endif + +static void +read_hypervisor(struct cpu_desc *cpu) +{ + read_hypervisor_cpuid(cpu); + + if (cpu->hyper) + /* hvm */ + cpu->virtype = VIRT_FULL; + + else if (!access(_PATH_PROC_XEN, F_OK)) { + /* Xen para-virt or dom0 */ + FILE *fd = fopen(_PATH_PROC_XENCAP, "r"); + int dom0 = 0; + + if (fd) { + char buf[256]; + + if (fscanf(fd, "%s", buf) == 1 && + !strcmp(buf, "control_d")) + dom0 = 1; + fclose(fd); + } + cpu->virtype = dom0 ? VIRT_NONE : VIRT_PARA; + cpu->hyper = HYPER_XEN; + + } else if (has_pci_device(0x5853, 0x0001)) { + /* Xen full-virt on non-x86_64 */ + cpu->hyper = HYPER_XEN; + cpu->virtype = VIRT_FULL; + } +} + static void read_topology(struct cpu_desc *cpu) { @@ -337,18 +490,6 @@ read_nodes(struct cpu_desc *cpu) static void check_system(void) { - FILE *fd; - char buf[256]; - - /* Dom0 Kernel gives wrong information. */ - fd = fopen(_PATH_PROC_XENCAP, "r"); - if (fd) { - if (fscanf(fd, "%s", buf) == 1 && !strcmp(buf, "control_d")) - errx(EXIT_FAILURE, - _("error: Dom0 Kernel is unsupported.")); - fclose(fd); - } - /* Read through sysfs. */ if (access(_PATH_SYS_SYSTEM, F_OK)) errx(EXIT_FAILURE, @@ -432,8 +573,6 @@ print_parsable(struct cpu_desc *cpu) static void print_readable(struct cpu_desc *cpu) { - char buf[BUFSIZ]; - print_s("Architecture:", cpu->arch); print_n("CPU(s):", cpu->ct_cpu); @@ -455,15 +594,18 @@ print_readable(struct cpu_desc *cpu) print_s(_("Stepping:"), cpu->stepping); if (cpu->mhz) print_s(_("CPU MHz:"), cpu->mhz); - if (cpu->flags) { - snprintf(buf, sizeof(buf), " %s ", cpu->flags); - if (strstr(buf, " svm ")) + if (cpu->virtflag) { + if (!strcmp(cpu->virtflag, "svm")) print_s(_("Virtualization:"), "AMD-V"); - else if (strstr(buf, " vmx ")) + else if (!strcmp(cpu->virtflag, "vmx")) print_s(_("Virtualization:"), "VT-x"); } - + if (cpu->hyper) { + print_s(_("Hypervisor vendor:"), hv_vendors[cpu->hyper]); + print_s(_("Virtualization type:"), virt_types[cpu->virtype]); + } if (have_cache) { + char buf[512]; int i; for (i = cpu->ct_cache - 1; i >= 0; i--) { @@ -545,6 +687,8 @@ int main(int argc, char *argv[]) if (have_node) read_nodes(cpu); + read_hypervisor(cpu); + /* Show time! */ if (parsable) print_parsable(cpu); -- cgit v1.2.3-55-g7522