[libvirt-users] How to disable kvm_steal_time feature

Piotr Rybicki piotr.rybicki at innervision.pl
Mon Nov 30 13:02:13 UTC 2015

 >> 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 
 >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' 
 > <qemu:commandline>
 >   <qemu:arg value='-cpu'/>
 >   <qemu:arg value='${CPU_SPEC},-kvm_steal_time'/>
 > </qemu:commandline>
 >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'/>

Thank You Martin, that helped.

Just for information, commit for this bug in kernel:

Best regards
Piotr Rybicki

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