RHBA-2012:1595 - Bug Fix Advisory

Topic

Updated libvirt packages that fix several bugs are now available for Red Hat
Enterprise Linux 6.

Description

The libvirt library is a C API for managing and interacting with the
virtualization capabilities of Linux and other operating systems. In addition,
libvirt provides tools for remote management of virtualized systems.

This update fixes the following bugs:

• The AMD FX series processors contain "modules" which are reported by the

kernel as both threads and cores. Previously, the processor topology detection
code in libvirt was unable to detect these modules. Consequently, libvirt
reported twice the actual number of processors. With this update, topologies
that add up to the total number of processors reported by the system are
properly reported even though the actual topology has to be checked in the
output of the virCapabilities() function.

Note that the capability output for topology detection purposes should be used
due to performance reasons. The NUMA topology has high impact on performance but
the impact of the physical topology can differ from that. (BZ#877024)

• Whenever the virDomainGetXMLDesc() function was executed on a domain that was

unresponsive, the call also became unresponsive. With this update, QEMU sends
the BALLOON_CHANGE event when memory usage on a domain changes so that
virDomainGetXMLDesc() no longer has to query an unresponsive domain. As a
result, virDomainGetXMLDesc() calls no longer hang in the described scenario.
(BZ#884713)

All users of libvirt are advised to upgrade to these updated packages, which fix
these bugs.

Solution

Before applying this update, make sure that all previously-released errata
relevant to your system have been applied.

This update is available via Red Hat Network. Details on how to use the Red Hat
Network to apply this update are available at
https://access.redhat.com/knowledge/articles/11258

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 6.3 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 6.3 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 6.3 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 6.3 ppc64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.3 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.3 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems) 6 s390x

Fixes

• BZ - 877024 - virsh nodeinfo can't get the right info on AMD Bulldozer cpu
• BZ - 884713 - Add support for qemu-kvm's BALLOON_CHANGE event to avoid using monitor in virDomainGetXMLDesc

CVEs

(none)

References

(none)