Detect Vanerpool

Detect Vanerpool

[gimli]

Hi.

I have a new Intel iMac with the Yonah CPU. How can i determine if 
Vanderpool is enabled or not. What should i see in /proc/cpuinfo ?
Does anyone of you work on a port of xen to efi and the Intel iMac,
if so i would be intrested in help testing it.

cu

Edgar (gimli) Hucek

Re: Detect Vanerpool

[Keir Fraser]

On 7 Mar 2006, at 22:53, gimli wrote:

> I have a new Intel iMac with the Yonah CPU. How can i determine if
> Vanderpool is enabled or not. What should i see in /proc/cpuinfo ?

2.6.16 Linux kernels will list 'vmx' as one of the CPU features. You 
cannot determine whether VMX is supported by looking at /proc/cpuinfo 
if you are running an earlier kernel.

  -- Keir

Re: Detect Vanerpool

[Thorolf Godawa]

>I have a new Intel iMac with the Yonah CPU. How can i determine if
>Vanderpool is enabled or not. What should i see in /proc/cpuinfo ?
in the flags has to be somewhere "VMX", f.ex.:

processor       : 0
...
flags           : fpu tsc msr pae mce cx8 apic mtrr mca cmov pat pse36
clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc pni
monitor ds_cpl vmx

-- 

Chau y hasta luego,

Thorolf

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Re: Detect Vanerpool

[Andi Kleen]

Keir Fraser <Keir.Fraser@cl.cam.ac.uk> writes:

> On 7 Mar 2006, at 22:53, gimli wrote:
> 
> > I have a new Intel iMac with the Yonah CPU. How can i determine if
> > Vanderpool is enabled or not. What should i see in /proc/cpuinfo ?
> 
> 2.6.16 Linux kernels will list 'vmx' as one of the CPU features. You
> cannot determine whether VMX is supported by looking at /proc/cpuinfo
> if you are running an earlier kernel.

In theory it could be still disabled by someone (e.g. another
Hypervisor) in the IA32 FEATURE MSR.

On an earlier kernel it can be tested with this simple program
(modulo the feature MSR)

-Andi

/* Detect if machine supports VMX. Written 2005 by Andi Kleen */
#include <stdio.h>

static inline unsigned int cpuid_ecx(unsigned int op)
{
        unsigned int eax, ecx;

        __asm__("cpuid"
                : "=a" (eax), "=c" (ecx)
                : "0" (op)
                : "bx", "dx" );
        return ecx;
}

int main(void)
{
        unsigned f = cpuid_ecx(1);
        if (f & (1<<5))
                printf("Machine has VT\n");
        else
                printf("Machine doesn't have VT\n");
}