[Engine-devel] unmanaged devices thrown into 'custom' feature

[Dan Kenigsberg]

I have just noticed that when a VM is started for the second time, Engine
issues the "create" vdsm verb with some information regarding
"unmanaged" devices (an example is shown below[1]) in the 'custom'
propery bag.

I'm surprised about this, as I was not aware of this usage of the
'custom' dictionary, and Vdsm is not doing anything with the data.

Would anyone elaborate about it? On the face of it, it does not seem
like a pleasant API. If Engine wants to tell Vdsm about the location of
various devices, we should probably be using the 'devices' property, not
the bag of 'custom' property made for user-defined hooks.

I hope this API pecularity can be avoided, and very much hope that no
one is depending on it.

Dan.


[1]
'custom': {
    'device_e97a9759-1c1b-45ed-9ed9-7136ef538315': 'VmDevice {vmId=068d4914-4191-400d-a220-17a7f2d8e80c, deviceId=e97a9759-1c1b-45ed-9ed9-7136ef538315, device=ide, type=controller, bootOrder=0, specParams={}, address={bus=0x00, domain=0x0000, type=pci, slot=0x01, function=0x1}, managed=false, plugged=true, readOnly=false, alias=ide0}',
    'device_e97a9759-1c1b-45ed-9ed9-7136ef538315device_133d9bfa-c531-414e-ad20-208d67d5a5e6device_7bfffa34-2e27-4b01-b499-6ac79c997709': 'VmDevice {vmId=068d4914-4191-400d-a220-17a7f2d8e80c, deviceId=7bfffa34-2e27-4b01-b499-6ac79c997709, device=unix, type=channel, bootOrder=0, specParams={}, address={port=1, bus=0, controller=0, type=virtio-serial}, managed=false, plugged=true, readOnly=false, alias=channel0}',
    'device_e97a9759-1c1b-45ed-9ed9-7136ef538315device_133d9bfa-c531-414e-ad20-208d67d5a5e6': 'VmDevice {vmId=068d4914-4191-400d-a220-17a7f2d8e80c, deviceId=133d9bfa-c531-414e-ad20-208d67d5a5e6, device=virtio-serial, type=controller, bootOrder=0, specParams={}, address={bus=0x00, domain=0x0000, type=pci, slot=0x04, function=0x0}, managed=false, plugged=true, readOnly=false, alias=virtio-serial0}',
    'device_e97a9759-1c1b-45ed-9ed9-7136ef538315device_133d9bfa-c531-414e-ad20-208d67d5a5e6device_7bfffa34-2e27-4b01-b499-6ac79c997709device_7c107c63-605f-4b21-9893-c052ec211424device_48007de9-467d-46a1-aa84-cc1a6419b5fb': 'VmDevice {vmId=068d4914-4191-400d-a220-17a7f2d8e80c, deviceId=48007de9-467d-46a1-aa84-cc1a6419b5fb, device=spicevmc, type=channel, bootOrder=0, specParams={}, address={port=3, bus=0, controller=0, type=virtio-serial}, managed=false, plugged=true, readOnly=false, alias=channel2}',
    'device_e97a9759-1c1b-45ed-9ed9-7136ef538315device_133d9bfa-c531-414e-ad20-208d67d5a5e6device_7bfffa34-2e27-4b01-b499-6ac79c997709device_7c107c63-605f-4b21-9893-c052ec211424': 'VmDevice {vmId=068d4914-4191-400d-a220-17a7f2d8e80c, deviceId=7c107c63-605f-4b21-9893-c052ec211424, device=unix, type=channel, bootOrder=0, specParams={}, address={port=2, bus=0, controller=0, type=virtio-serial}, managed=false, plugged=true, readOnly=false, alias=channel1}'
}