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Bug 1535953

Summary: Enabling iothreads after having virtio disks doesn't take effect
Product: [oVirt] ovirt-engine Reporter: Roy Golan <rgolan>
Component: Backend.CoreAssignee: Nobody <nobody>
Status: CLOSED DUPLICATE QA Contact: meital avital <mavital>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 4.2.0CC: bugs, michal.skrivanek
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Last Closed: 2018-01-19 11:28:46 UTC Type: Bug
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Description Flags
virtio scsi controller on the Vm devices tab in the engine
none
dom xml after iothread enabled none

Description Roy Golan 2018-01-18 10:19:21 UTC 
Created attachment 1382846 [details]
virtio scsi controller on the Vm devices tab in the engine

Description of problem:
Trying to apply iothreads to an existing vm with virtio disks will not take affect. The resulting domain xml will not include it in the controller defitions

Version-Release number of selected component (if applicable):


How reproducible:
100%

Steps to Reproduce:
1. Create a vm with several virtio disks 
2. Run the vm, wait for devices to get addresses
3. shutdown the vm
4. edit vm, check iothreads under resource allocation
5  run the vm

Actual results:
grep iothread on dom xml:

<iothreads>1</iothreads>

Expected results:
dom should contain both the declaration, and the driver configuration:

<iothreads>1</iothreads>
...
<controller type='scsi' index='0' model='virtio-scsi'>
    <driver iothread='4'/>


Additional info:
See libvirt dom xml documentation: https://libvirt.org/formatdomain.html#elementsControllers
Comment 1 Roy Golan 2018-01-18 10:22:49 UTC 
Created attachment 1382847 [details]
dom xml after iothread enabled
Comment 2 Michal Skrivanek 2018-01-19 11:28:46 UTC 
yep, broken

*** This bug has been marked as a duplicate of bug 1535961 ***