[libvirt] [bug] python-libvirt vcpus mismatch

[Chris Friesen]

I've got a libvirt-created instance where I've been messing with 
affinity, and now something is strange.

I did the following in python:

 >>> import libvirt
 >>> conn=libvirt.open("qemu:///system")
 >>> dom = conn.lookupByName('instance-00000027')
 >>> dom.vcpus()
([(0, 1, 528150000000L, 2), (1, 1, 548070000000L, 3)], [(False, False, 
True, False), (False, False, True, False)])

I'm totally confused by that "3".  It's supposed to represent the 
physical cpu that virtual cpu 1 is running on.  But cpu 3 isn't even in 
the allowable affinity map for vcpu 1.



If I query the data other ways, I get both cpus running on physical cpu 2:

root at compute-0:~# virsh vcpupin instance-00000027
VCPU: CPU Affinity
----------------------------------
    0: 2
    1: 2

root at compute-0:~# virsh emulatorpin instance-00000027
emulator: CPU Affinity
----------------------------------
        *: 2

root at compute-0:~# taskset -pac 15072
pid 15072's current affinity list: 2
pid 15073's current affinity list: 1-3
pid 15075's current affinity list: 2
pid 15076's current affinity list: 0


So I'm left with the conclusion that there is something strange going on 
with libvirt-python.  Anyone got any ideas?

Chris