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

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

Take a look at tools/misc/xen-detect.c in the Xen sources.

 -- Keir

On 17/05/2010 03:39, "胡少龙" <sunofblack@xxxxxxxx> wrote:

> 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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