[Xen-devel] RE: [patch] provide uniqe x2apicid for each vcpu in the cpuid leaf 0xb

["Kamble, Nitin A" <nitin.a.kamble@xxxxxxxxx>]

Keir,
   It is be used to find out the extended cpu topology of specified in the leaf 
0xb.

Thanks & Regards,
Nitin
Linux Open Source Technology Center, Intel Corporation
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>-----Original Message-----
>From: Keir Fraser [mailto:keir.fraser@xxxxxxxxxxxxx]
>Sent: Thursday, May 07, 2009 12:05 AM
>To: Kamble, Nitin A
>Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
>Subject: Re: [patch] provide uniqe x2apicid for each vcpu in the cpuid leaf
>0xb
>
>What's the point of emulating an x2apicid when we don't emulate an x2apic?
>
> -- Keir
>
>On 06/05/2009 23:11, "Nitin A Kamble" <nitin.a.kamble@xxxxxxxxx> wrote:
>
>> Keir,
>>
>> Just like the apicid, x2apicid is also unique to each cpu. x2apicid is
>> coming from edx register of the cpuid leaf 0xb.
>>
>> Please Apply/comment.
>>
>> Signed-Off-By: Nitin A Kamble <nitin.a.kamble@xxxxxxxxx>
>>
>>
>> diff -r 08618cd10522 xen/arch/x86/hvm/hvm.c
>> --- a/xen/arch/x86/hvm/hvm.c Mon May 04 14:13:49 2009 -0700
>> +++ b/xen/arch/x86/hvm/hvm.c Mon May 04 14:19:05 2009 -0700
>> @@ -1687,6 +1687,10 @@
>>          *ebx |= (v->vcpu_id * 2) << 24;
>>          if ( vlapic_hw_disabled(vcpu_vlapic(v)) )
>>              __clear_bit(X86_FEATURE_APIC & 31, edx);
>> +    } else if ( input == 0x0000000b )
>> +    {
>> +        /* fix the x2apicid */
>> + *edx = v->vcpu_id * 2;
>>      }
>>  }
>>
>>
>


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