I am working with libvirt and I am trying to set cpu affinity. Now I can always use 

    virsh vcpupin <domain_name> <vcpu> <pcpu>

to pin vcpus to pcpus. I want to do it using Python API. Now, there is function pinVcpu which is supposed to do that. But this is not working. For example I gave 

    dom.pinVcpu(0,1)

but still my vcpu affinity is for all the pcpus. The function returns 0 (success).

Any idea what am I doing wrong?

Thanks.