[libvirt] Python setBlkioParameters function broken

[Qiang Guan]

I've tried to use domain.setBlkioParameters with ipython, and I'm
finding it's throwing the mysterious error:

ubuntu at host-192-168-0-7:~$ dpkg -l | grep libvirt
ii libvirt-bin 1.2.2-0ubuntu13.1 amd64 programs for the libvirt library
ii libvirt0 1.2.2-0ubuntu13.1 amd64 library for interfacing with
different virtualization systems
ii python-libvirt 1.2.2-0ubuntu1 amd64 libvirt Python bindings
ubuntu at host-192-168-0-7:~$ sudo ipython
......
In [85]: doms[0]
Out[85]: <libvirt.virDomain at 0x7fe688879250>

In [86]: params
Out[86]: {'weight': 250}

In [87]: doms[0].setBlkioParameters(params, 0)
libvirt: error : argument unsupported: parameter '' not supported
---------------------------------------------------------------------------
libvirtError Traceback (most recent call last)
<ipython-input-87-026c35502a5c> in <module>()
----> 1 doms[0].setBlkioParameters(params, 0)

/usr/lib/python2.7/dist-packages/libvirt.pyc in setBlkioParameters(self,
params, flags)
1961 """Change the blkio tunables """
1962 ret = libvirtmod.virDomainSetBlkioParameters(self._o, params, flags)
-> 1963 if ret == -1: raise libvirtError ('virDomainSetBlkioParameters()
failed', dom=self)
1964 return ret
1965

libvirtError: argument unsupported: parameter '' not supported

The libvirt debug log info are as following:
2014-05-27 08:37:27.752+0000: 7559: debug :
remoteDispatchDomainSetBlkioParametersHelper:7328 :
server=0x7fd81deec930 client=0x7fd81df05170 msg=0x7fd81df06eb0
rerr=0x7fd816059c80 args=0x7fd7e40009a0 ret=0x7fd7e4000910
2014-05-27 08:37:27.752+0000: 7559: debug : virObjectNew:199 :
OBJECT_NEW: obj=0x7fd7e4000c60 classname=virDomain
2014-05-27 08:37:27.752+0000: 7559: debug : virObjectRef:293 :
OBJECT_REF: obj=0x7fd7f80011f0
2014-05-27 08:37:27.752+0000: 7559: debug :
virDomainSetBlkioParameters:3985 : dom=0x7fd7e4000c60, (VM:
name=instance-00000050, uuid=f844cf42-07d1-4b73-8de7-7437bf32aab0),
params=0x7fd7e4000930, nparams=1, flags=0
2014-05-27 08:37:27.752+0000: 7559: debug :
virDomainSetBlkioParameters:3986 : params[""]=(uint)250
2014-05-27 08:37:27.752+0000: 7559: debug : virObjectRef:293 :
OBJECT_REF: obj=0x7fd81deec300
2014-05-27 08:37:27.752+0000: 7559: debug :
virAccessManagerCheckConnect:215 : manager=0x7fd81deec300(name=stack)
driver=QEMU perm=0
2014-05-27 08:37:27.752+0000: 7559: debug :
virAccessManagerCheckConnect:215 : manager=0x7fd81deec370(name=none)
driver=QEMU perm=0
2014-05-27 08:37:27.752+0000: 7559: debug : virObjectUnref:256 :
OBJECT_UNREF: obj=0x7fd81deec300
2014-05-27 08:37:27.752+0000: 7559: error : virTypedParamsValidate:97 :
argument unsupported: parameter '' not supported

-- 
------------
Jackie
Best Regards

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