Description of problem: vcpu order doesn't work Version-Release number of selected component (if applicable): v2.1.0-209-ge3229f6 How reproducible: 100% Steps to Reproduce: 1. # virsh dumpxml r7 --inactive <domain type='kvm'> <name>r7</name> <uuid>67c7a123-5415-4136-af62-a2ee098ba6cd</uuid> <maxMemory slots='16' unit='KiB'>15242882</maxMemory> <memory unit='KiB'>2228224</memory> <currentMemory unit='KiB'>2228224</currentMemory> <vcpu placement='static' current='1'>10</vcpu> <vcpus> <vcpu id='0' enabled='yes' hotpluggable='no' order='1'/> <vcpu id='1' enabled='no' hotpluggable='yes' order='8'/> <vcpu id='2' enabled='no' hotpluggable='yes' order='3'/> <vcpu id='3' enabled='no' hotpluggable='yes' order='4'/> <vcpu id='4' enabled='no' hotpluggable='yes' order='5'/> <vcpu id='5' enabled='no' hotpluggable='yes' order='6'/> <vcpu id='6' enabled='no' hotpluggable='yes' order='7'/> <vcpu id='7' enabled='no' hotpluggable='yes' order='2'/> <vcpu id='8' enabled='no' hotpluggable='yes' order='9'/> <vcpu id='9' enabled='no' hotpluggable='yes' order='10'/> </vcpus> 2. # virsh start r7 Domain r7 started 3. check xml and order disappear: # virsh dumpxml r7 <domain type='kvm' id='18'> <name>r7</name> <uuid>67c7a123-5415-4136-af62-a2ee098ba6cd</uuid> <maxMemory slots='16' unit='KiB'>15243264</maxMemory> <memory unit='KiB'>2228224</memory> <currentMemory unit='KiB'>2228224</currentMemory> <vcpu placement='static' current='1'>10</vcpu> <vcpus> <vcpu id='0' enabled='yes' hotpluggable='no' order='1'/> <vcpu id='1' enabled='no' hotpluggable='yes'/> <vcpu id='2' enabled='no' hotpluggable='yes'/> <vcpu id='3' enabled='no' hotpluggable='yes'/> <vcpu id='4' enabled='no' hotpluggable='yes'/> <vcpu id='5' enabled='no' hotpluggable='yes'/> <vcpu id='6' enabled='no' hotpluggable='yes'/> <vcpu id='7' enabled='no' hotpluggable='yes'/> <vcpu id='8' enabled='no' hotpluggable='yes'/> <vcpu id='9' enabled='no' hotpluggable='yes'/> </vcpus> 4. hotplug vcpu: # virsh setvcpus r7 2 5. # virsh dumpxml r7 <domain type='kvm' id='18'> <name>r7</name> <uuid>67c7a123-5415-4136-af62-a2ee098ba6cd</uuid> <maxMemory slots='16' unit='KiB'>15243264</maxMemory> <memory unit='KiB'>2228224</memory> <currentMemory unit='KiB'>2228224</currentMemory> <vcpu placement='static' current='2'>10</vcpu> <vcpus> <vcpu id='0' enabled='yes' hotpluggable='no' order='1'/> <vcpu id='1' enabled='yes' hotpluggable='yes' order='2'/> <vcpu id='2' enabled='no' hotpluggable='yes'/> <vcpu id='3' enabled='no' hotpluggable='yes'/> <vcpu id='4' enabled='no' hotpluggable='yes'/> <vcpu id='5' enabled='no' hotpluggable='yes'/> <vcpu id='6' enabled='no' hotpluggable='yes'/> <vcpu id='7' enabled='no' hotpluggable='yes'/> <vcpu id='8' enabled='no' hotpluggable='yes'/> <vcpu id='9' enabled='no' hotpluggable='yes'/> </vcpus> Actual results: order disappear during guest start Expected results: from libvirt.org: order allows to specify the order to add the vcpus. For hypervisors/platforms that require to insert multiple vcpus at once the order may be be duplicated accross all vcpus that need to be enabled at once. Specifying order is not necessary, vcpus are then added in an arbitrary order. I cannot find why libvirt will ignore this configuration from the document Additional info:
I've clarified the upstream docs: commit 54147fd9be31838904f6f2251510da91a1bd0ca7 Author: Peter Krempa <pkrempa> Date: Thu Aug 25 11:41:44 2016 -0400 doc: clarify documentation for vcpu order Make it clear that vcpu order is valid for online vcpus only and state that it has to be specified for all vcpus or not provided at all.