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Bug 1097677

Summary: libvirt loses track of hotplugged vcpus after daemon restart
Product: Red Hat Enterprise Linux 7 Reporter: yanbing du <ydu>
Component: libvirtAssignee: Ján Tomko <jtomko>
Status: CLOSED ERRATA QA Contact: Virtualization Bugs <virt-bugs>
Severity: medium Docs Contact:
Priority: medium    
Version: 7.1CC: dyuan, honzhang, jmiao, jtomko, mzhan, rbalakri, xuzhang, zhwang
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: libvirt-1.2.7-1.el7 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: 1088703 Environment:
Last Closed: 2015-03-05 07:35:23 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1088703    
Bug Blocks:    

Comment 1 Ján Tomko 2014-05-14 10:04:09 UTC 
Fixed upstream by:
commit b396e602c97ab69c86dfd84d2f9e48b4c04a48a4
Author:     Ján Tomko <jtomko>
CommitDate: 2014-04-23 14:24:21 +0200

    Save domain status after cpu hotplug
    
    The live change of vcpus was not reflected in the domain status
    xml and it got lost during libvirtd restart.
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1088703

git describe: v1.2.3-149-gb396e60 contains: v1.2.4-rc1~78
Comment 3 Jincheng Miao 2014-12-03 10:50:54 UTC 
# rpm -q libvirt
libvirt-1.2.8-9.el7.x86_64

1. configure guest with 3 vcpus online
# virsh edit r7a
...
  <vcpu placement='auto' current='3'>6</vcpu>
...

# virsh vcpuinfo r7a
VCPU:           0
CPU:            2
State:          running
CPU time:       4.3s
CPU Affinity:   yyyyyyyy

VCPU:           1
CPU:            2
State:          running
CPU Affinity:   yyyyyyyy

VCPU:           2
CPU:            3
State:          running
CPU Affinity:   yyyyyyyy


2. online one more vcpu
# virsh setvcpus r7a 4

# virsh vcpuinfo r7a
VCPU:           0
CPU:            1
State:          running
CPU time:       7.9s
CPU Affinity:   yyyyyyyy

VCPU:           1
CPU:            1
State:          running
CPU time:       1.0s
CPU Affinity:   yyyyyyyy

VCPU:           2
CPU:            0
State:          running
CPU time:       0.9s
CPU Affinity:   yyyyyyyy

VCPU:           3
CPU:            6
State:          running
CPU Affinity:   yyyyyyyy


3. restart libvirtd then check vcpuinfo
# systemctl restart libvirtd

# virsh vcpuinfo r7a
VCPU:           0
CPU:            2
State:          running
CPU time:       8.6s
CPU Affinity:   yyyyyyyy

VCPU:           1
CPU:            1
State:          running
CPU time:       1.7s
CPU Affinity:   yyyyyyyy

VCPU:           2
CPU:            0
State:          running
CPU time:       1.5s
CPU Affinity:   yyyyyyyy

VCPU:           3
CPU:            6
State:          running
CPU Affinity:   yyyyyyyy

As we could see, vcpuinfo is same with libvirt restarted before.
So change the status to VERIFIED.
Comment 5 errata-xmlrpc 2015-03-05 07:35:23 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2015-0323.html