[libvirt-users] CPU Flags libvirt 0.9.12

[Michael Beham]

Am 03.08.2012 17:20, schrieb Peter Krempa:
> On 08/03/12 16:35, Michael Beham wrote:
>> Hi,
>>
>> I´m using libvirt version 0.9.12 under Debian Squeeze with and AMD
>> Opteron 4280. Executing the virsh capabilities command only show me the
>> following flags:
>>
>> <cpu>
>> <arch>x86_64</arch>
>> <model>Opteron_G4</model>
>> <vendor>AMD</vendor>
>> <topology sockets='1' cores='8' threads='2'/>
>> <feature name='nodeid_msr'/>
>> <feature name='wdt'/>
>> <feature name='skinit'/>
>> <feature name='ibs'/>
>> <feature name='osvw'/>
>> <feature name='cr8legacy'/>
>> <feature name='extapic'/>
>> <feature name='cmp_legacy'/>
>> <feature name='fxsr_opt'/>
>> <feature name='mmxext'/>
>> <feature name='osxsave'/>
>> <feature name='monitor'/>
>> <feature name='ht'/>
>> <feature name='vme'/>
>> </cpu>
>>
>> Should not there be more flags supported by the CPU, for example the
>> SVM-Flag for virtualization because executing cat /proc/cpuinfo gives me
>> quite a lot of more flags and also the SVM Flag.
>
> The output is correct as libvirt tries to find a "parent" processor 
> and the flags that are in your output are just flags that your 
> processor supports and the parent, in this case Opteron G4, doesn't.
>
> Peter
>
>>
>> Cheers,
>> Mike
>>
>>
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>>
>
Hmm sorry , I did not get the point so far!
In the XML-File of the VM I´m using the cpu passthrough attribute so 
that most of the flags from the host cpu are available in the VM. So 
exectuing cat /proc/cpuinfo in the VM shows exactly the same CPU-model 
like on the Host, there are only some flags missing, but for example the 
SVM Flag which I need for the Virtualization is listed in the VM and on 
the host system too.

So I´m quite confused about the output of virsh capabilities!