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Bug 868972

Summary:	CPU topology is missing in capabilities XML when libvirt fails to detect host CPU model
Product:	Red Hat Enterprise Linux 6	Reporter:	Chris Pelland <cpelland>
Component:	libvirt	Assignee:	Jiri Denemark <jdenemar>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	high	Docs Contact:
Priority:	high
Version:	6.3	CC:	acathrow, asegundo, dallan, danken, dougsland, dyasny, dyuan, honzhang, jdenemar, mzhan, pm-eus, rvaknin, rwu, ybronhei, yupzhang
Target Milestone:	rc	Keywords:	TestBlocker, ZStream
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	libvirt-0.9.10-21.el6_3.6	Doc Type:	Bug Fix
Doc Text:	Cause: When libvirt could not find a suitable CPU model for host CPU, it would not provide CPU topology in host capabilities even though the topology was detected correctly. Consequence: Applications that want to examine host CPU topology but otherwise do not care about CPU model could not see the topology in host capabilities. Fix: Host capabilities XML now contains host CPU topology even if host CPU model is unknown. Result: Applications can rely on host CPU topology to always be present in capabilities XML unless detecting the topology itself failed.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2012-11-22 09:40:03 UTC	Type:	---
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:	866999, 876475
Bug Blocks:

Description Chris Pelland 2012-10-22 15:27:07 UTC

This bug has been copied from bug #866999 and has been proposed
to be backported to 6.3 z-stream (EUS).

Comment 4 Jiri Denemark 2012-10-31 12:35:04 UTC

Sent for review: http://post-office.corp.redhat.com/archives/rhvirt-patches/2012-October/msg01258.html

Comment 7 Rami Vaknin 2012-11-14 16:23:44 UTC

Verified on libvirt-0.9.10-21.el6_3.6.x86_64 (rhel6.3).

The VM's xml given by "virsh capabilities" now contains the cpu topology:

<capabilities>

  <host>
    <uuid>067f8a8b-5ab3-413c-aa37-945854bf102e</uuid>
    <cpu>
      <arch>x86_64</arch>
      <topology sockets='1' cores='1' threads='1'/>
    </cpu>
    <power_management>
      <suspend_disk/>
    </power_management>
    <migration_features>
      <live/>
      <uri_transports>
        <uri_transport>tcp</uri_transport>
      </uri_transports>
    </migration_features>
    <topology>
      <cells num='1'>
        <cell id='0'>
          <cpus num='1'>
            <cpu id='0'/>
          </cpus>
        </cell>
      </cells>
    </topology>
    <secmodel>
      <model>selinux</model>
      <doi>0</doi>
    </secmodel>
  </host>

</capabilities>

Comment 9 errata-xmlrpc 2012-11-22 09:40:03 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.

http://rhn.redhat.com/errata/RHBA-2012-1484.html