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
xmlfile.
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'/>
Thank You Martin, that helped. Just for information, commit for this bug in kernel: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=7c... Best regards Piotr Rybicki