lib/librte_eal/common/arch/x86/rte_hypervisor.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright 2017 Mellanox Technologies, Ltd
   3  */
   4
   5 #include "rte_hypervisor.h"
   6
   7 #include <stdint.h>
   8 #include <string.h>
   9
  10 #include "rte_cpuflags.h"
  11 #include "rte_cpuid.h"
  12
  13 /* See http://lwn.net/Articles/301888/ */
  14 #define HYPERVISOR_INFO_LEAF 0x40000000
  15
  16 enum rte_hypervisor
  17 rte_hypervisor_get(void)
  18 {
  19         cpuid_registers_t regs;
  20         int reg;
  21         char name[13];
  22
  23         if (!rte_cpu_get_flag_enabled(RTE_CPUFLAG_HYPERVISOR))
  24                 return RTE_HYPERVISOR_NONE;
  25
  26         __cpuid(HYPERVISOR_INFO_LEAF,
  27                         regs[RTE_REG_EAX], regs[RTE_REG_EBX],
  28                         regs[RTE_REG_ECX], regs[RTE_REG_EDX]);
  29         for (reg = 1; reg < 4; reg++)
  30                 memcpy(name + (reg - 1) * 4, &regs[reg], 4);
  31         name[12] = '\0';
  32
  33         if (strcmp("KVMKVMKVM", name) == 0)
  34                 return RTE_HYPERVISOR_KVM;
  35         if (strcmp("Microsoft Hv", name) == 0)
  36                 return RTE_HYPERVISOR_HYPERV;
  37         if (strcmp("VMwareVMware", name) == 0)
  38                 return RTE_HYPERVISOR_VMWARE;
  39         return RTE_HYPERVISOR_UNKNOWN;
  40 }