27 нояб. 2015 г. 14:15 пользователь "Martin Kletzander" <mkletzan@redhat.com> написал:
>
> On Fri, Nov 20, 2015 at 04:31:56PM +0100, Piotr Rybicki wrote:
>>
>> Hi.
>>
>> I would like to workaround a bug, when after live-migration of KVM
>> guest, there is a 100% steal time shown in guest.
>>
>> I've read, that disabling 'kvm_steal_time' feature should workarund
>> this bug, but i can't find a way to disable it in libvirt's domain xml
>> file.
>>
>
> There is no support for that in libvirt.  Either we must addit ad a
> feature (patches welcome), but if that's there just for a workaround,
> I would suggest chasing the original bug.
>
> If you just want to check that the workaround works, you could check
> how the '-cpu ' parameter looks like when the domain is running and
> then use the unsupported way of adding parameters to the qemu
> commandline to specify the -cpu parameter again (qemu should use the
> last one, so it should work), something like this:
>
> <domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
> ...
>  <qemu:commandline>
>    <qemu:arg value='-cpu'/>
>    <qemu:arg value='${CPU_SPEC},-kvm_steal_time'/>
>  </qemu:commandline>
> </domain>
>
> where ${CPU_SPEC} is the next parameter after the '-cpu' one from the
> command line, so for qemu command line similar to this:
>
>  qemu-kvm ... -cpu Nehalem,+feat,something ...
>
> the line in XML would be:
>
>  <qemu:arg value='Nehalem,+feat,something,-kvm_steal_time'/>
>
> HTH,
>
> Martin
>
>> Tried in <cpu> section:
>> <feature policy='disable' name='kvm_steal_time'/>
>> but that doesn't work.
>>
>> Also, couldn't find any related information in libvirt documentation.
>> Google helps neither.
>>
>> How can I disable this feature?
>>
>> Thanks in advance.
>> Piotr Rybicki
>>
>>

Does it possible to calculate steal time for  vm if I have libvirt and domain stats?
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