[Xen-devel] Problem with CPUID getting information in hvm guest

[胡少龙 <sunofblack@xxxxxxxx>]

Hi,

I am using fellowing code get xen vmm string , but came out with "GenuntelineI", not "XenVMMXenVMM", i am using xen 3.41 on ubuntu 8.04 ,is some thing changed ? Thx.

 

#include <stdio.h>
#include <inttypes.h>
#include <string.h>

typedef union
{
 uint32_t r[3];
 char string[12];
}cpuid_t;

#define CPUID(command,result) \
    __asm __volatile(\
  "CPUID"\
  : "=b"(result.r[0]),"=c"(cpu.r[1]),"=d"(cpu.r[2])\
  : "a"(command));

int main(void)
{
 cpuid_t cpu;
 CPUID(0,cpu);
 printf("cpu.string=%s\n",cpu.string);
 if(strncmp(cpu.string,"XenVMMXenVMM",12)==0)
 {
  printf("Running as a Xen HVM guest\n");
 }
 else
 {
  printf("Running on native hardware or a non Xen hypervisor\n");
 }
 return 0;
}

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