Re: [libvirt-users] How to disable kvm_steal_time feature

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 > >

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