RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 1375920 - libvirt show wrong vcpuinfo for a inactive guest with hotpluggable vcpu
Summary: libvirt show wrong vcpuinfo for a inactive guest with hotpluggable vcpu
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: libvirt
Version: 7.3
Hardware: x86_64
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Peter Krempa
QA Contact: Jingjing Shao
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2016-09-14 09:01 UTC by Luyao Huang
Modified: 2017-08-01 23:57 UTC (History)
5 users (show)

Fixed In Version: libvirt-2.5.0-1.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2017-08-01 17:16:43 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHEA-2017:1846 0 normal SHIPPED_LIVE libvirt bug fix and enhancement update 2017-08-01 18:02:50 UTC

Description Luyao Huang 2016-09-14 09:01:59 UTC 
Description of problem:
libvirt show wrong vcpuinfo for a inactive guest with hotpluggable vcpu

Version-Release number of selected component (if applicable):
libvirt-2.0.0-8.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1. prepare guest xml like this:

# virsh dumpxml r7
...
  <vcpu placement='static' current='4'>10</vcpu>
  <vcpus>
    <vcpu id='0' enabled='yes' hotpluggable='no' order='1'/>
    <vcpu id='1' enabled='yes' hotpluggable='yes' order='4'/>
    <vcpu id='2' enabled='no' hotpluggable='yes'/>
    <vcpu id='3' enabled='no' hotpluggable='yes'/>
    <vcpu id='4' enabled='yes' hotpluggable='yes' order='3'/>
    <vcpu id='5' enabled='no' hotpluggable='yes'/>
    <vcpu id='6' enabled='yes' hotpluggable='yes' order='2'/>
    <vcpu id='7' enabled='no' hotpluggable='yes'/>
    <vcpu id='8' enabled='no' hotpluggable='yes'/>
    <vcpu id='9' enabled='no' hotpluggable='yes'/>
  </vcpus>
  <cputune>
    <vcpupin vcpu='0' cpuset='0'/>
    <vcpupin vcpu='1' cpuset='1'/>
    <vcpupin vcpu='2' cpuset='2'/>
    <vcpupin vcpu='3' cpuset='3'/>
    <vcpupin vcpu='4' cpuset='4'/>
    <vcpupin vcpu='5' cpuset='5'/>
    <vcpupin vcpu='6' cpuset='6'/>
    <vcpupin vcpu='7' cpuset='7'/>
    <vcpupin vcpu='8' cpuset='8'/>
    <vcpupin vcpu='9' cpuset='9'/>
  </cputune>
...

2. check inactive vcpuinfo:

# virsh vcpuinfo r7
VCPU:           0
CPU:            N/A
State:          N/A
CPU time        N/A
CPU Affinity:   y-----------------------

VCPU:           1
CPU:            N/A
State:          N/A
CPU time        N/A
CPU Affinity:   -y----------------------

VCPU:           2
CPU:            N/A
State:          N/A
CPU time        N/A
CPU Affinity:   --y---------------------

VCPU:           3
CPU:            N/A
State:          N/A
CPU time        N/A
CPU Affinity:   ---y--------------------


3.

Actual results:

# virsh vcpuinfo r7
VCPU:           0
CPU:            N/A
State:          N/A
CPU time        N/A
CPU Affinity:   y-----------------------

VCPU:           1
CPU:            N/A
State:          N/A
CPU time        N/A
CPU Affinity:   -y----------------------

VCPU:           2
CPU:            N/A
State:          N/A
CPU time        N/A
CPU Affinity:   --y---------------------

VCPU:           3
CPU:            N/A
State:          N/A
CPU time        N/A
CPU Affinity:   ---y--------------------


Expected results:

# virsh vcpuinfo r7
VCPU:           0
CPU:            N/A
State:          N/A
CPU time        N/A
CPU Affinity:   y-----------------------

VCPU:           1
CPU:            N/A
State:          N/A
CPU time        N/A
CPU Affinity:   -y----------------------

VCPU:           4
CPU:            N/A
State:          N/A
CPU time        N/A
CPU Affinity:   ----y-------------------

VCPU:           6
CPU:            N/A
State:          N/A
CPU time        N/A
CPU Affinity:   ------y-----------------


Additional info:
Comment 1 Peter Krempa 2016-10-12 15:31:56 UTC 
Fixed upstream:

commit a62655f9c33a8f7c6257779ddbdbf1352d53a526
Author: Peter Krempa <pkrempa>
Date:   Tue Oct 11 18:03:50 2016 +0200

    virsh: vcpuinfo: Report proper vcpu numbers and data for offline VMs
    
    If the VM is offline virsh attempted to at least report the pinning
    information for the VM. This would not work properly now that the vcpus
    can be sparse. Fix it by getting the vcpu states from the XML.
Comment 3 Jingjing Shao 2016-12-26 11:56:00 UTC 
Verified this issue and get the expected result. 

# rpm -q libvirt
libvirt-2.5.0-1.el7.x86_64

# virsh dumpxml rhel7.3
<domain type='kvm'>
  <name>rhel7.3</name>
  <uuid>a7b9969c-ef22-4b8b-90aa-28b5e655dff4</uuid>
  <memory unit='KiB'>1048576</memory>
  <currentMemory unit='KiB'>1048576</currentMemory>
  <vcpu placement='static' current='4'>10</vcpu>
  <vcpus>
    <vcpu id='0' enabled='yes' hotpluggable='no' order='1'/>
    <vcpu id='1' enabled='yes' hotpluggable='yes' order='4'/>
    <vcpu id='2' enabled='no' hotpluggable='yes'/>
    <vcpu id='3' enabled='no' hotpluggable='yes'/>
    <vcpu id='4' enabled='yes' hotpluggable='yes' order='3'/>
    <vcpu id='5' enabled='no' hotpluggable='yes'/>
    <vcpu id='6' enabled='yes' hotpluggable='yes' order='2'/>
    <vcpu id='7' enabled='no' hotpluggable='yes'/>
    <vcpu id='8' enabled='no' hotpluggable='yes'/>
    <vcpu id='9' enabled='no' hotpluggable='yes'/>
  </vcpus>
  <cputune>
    <vcpupin vcpu='0' cpuset='0'/>
    <vcpupin vcpu='1' cpuset='1'/>
    <vcpupin vcpu='2' cpuset='2'/>
    <vcpupin vcpu='3' cpuset='3'/>
    <vcpupin vcpu='4' cpuset='4'/>
    <vcpupin vcpu='5' cpuset='5'/>
    <vcpupin vcpu='6' cpuset='6'/>
    <vcpupin vcpu='7' cpuset='7'/>
    <vcpupin vcpu='8' cpuset='8'/>
    <vcpupin vcpu='9' cpuset='9'/>
  </cputune>
.....

# virsh vcpuinfo rhel7.3
VCPU:           0
CPU:            N/A
State:          N/A
CPU time        N/A
CPU Affinity:   y---------------------------------------------------------------

VCPU:           1
CPU:            N/A
State:          N/A
CPU time        N/A
CPU Affinity:   -y--------------------------------------------------------------

VCPU:           4
CPU:            N/A
State:          N/A
CPU time        N/A
CPU Affinity:   ----y-----------------------------------------------------------

VCPU:           6
CPU:            N/A
State:          N/A
CPU time        N/A
CPU Affinity:   ------y---------------------------------------------------------
Comment 4 errata-xmlrpc 2017-08-01 17:16:43 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://access.redhat.com/errata/RHEA-2017:1846
Comment 5 errata-xmlrpc 2017-08-01 23:57:38 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://access.redhat.com/errata/RHEA-2017:1846
Note You need to log in before you can comment on or make changes to this bug.