RHBA-2014:0357 - Bug Fix Advisory

Topic

Updated qemu-kvm-rhev packages that fix a bug are now available.

Description

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux
on AMD64 and Intel 64 systems. The qemu-kvm-rhev package provides the user-space
component for running virtual machines using KVM, in environments managed by Red
Hat Enterprise Virtualization Manager.

This update fixes the following bug:

• When hot unplugging a virtual CPU (vCPU) from a guest using libvirt, the

current Red Hat Enterprise Linux QEMU implementation does not remove the
corresponding vCPU thread. Because of this, libvirt previously did not correctly
perceive the vCPU count after a vCPU had been hot unplugged. Consequently, an
error occured in libvirt, which prevented increasing the vCPU count after the
hot unplug. In this update, information from QEMU is used to filter out inactive
vCPU threads of disabled vCPUs, and the internal checks now pass and allow the
hot plug. (BZ#1081462)

Users of qemu-kvm-rhev are advised to upgrade to these updated packages, which
fix this bug.

Solution

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

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

Affected Products

• Red Hat Virtualization 3 for RHEL 6 x86_64

Fixes

• BZ - 1081462 - [Intel 6.5.z Bug] virsh setvcpus can not setup correct vcpu number - rhev clone

CVEs

(none)

References

(none)