Bug 1097677 – libvirt loses track of hotplugged vcpus after daemon restart

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Bug 1097677 - libvirt loses track of hotplugged vcpus after daemon restart

Summary:	libvirt loses track of hotplugged vcpus after daemon restart

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	libvirt (Show other bugs)
Sub Component:
Version:	7.1
Hardware:	Unspecified Unspecified

Priority	medium Severity medium
Target Milestone:	rc
Target Release:	---
Assigned To:	Ján Tomko
QA Contact:	Virtualization Bugs
Docs Contact:

URL:
Whiteboard:
Keywords:

Depends On:	1088703
Blocks:
	Show dependency tree / graph

Reported:	2014-05-14 05:56 EDT by yanbing du
Modified:	2016-04-26 09:51 EDT (History)
CC List:	8 users (show)

See Also:
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 02:35:23 EST
Type:	Bug
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2015:0323	normal	SHIPPED_LIVE	Low: libvirt security, bug fix, and enhancement update	2015-03-05 07:10:54 EST

Groups: None (edit)

Comment 1 Ján Tomko 2014-05-14 06:04:09 EDT

Fixed upstream by:
commit b396e602c97ab69c86dfd84d2f9e48b4c04a48a4
Author:     Ján Tomko <jtomko@redhat.com>
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 05:50:54 EST

# 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 02:35:23 EST

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

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