RHBA-2014:0682 - 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:

• Previously, the libvirt API did not properly cancel the migration of QEMU

domains if it detected an error, which caused QEMU to pause guest CPUs. With
this update, if libvirt detects an error during a migration process, it informs
QEMU to cancel the ongoing migration. Now, after a failed migration, libvirt
resumes a domain, which then remains running, and QEMU no longer pauses guest
CPUs. (BZ#1100642)

• Prior to this update, the libvirt API canceled migration when it could not

access a QEMU monitor for more that 30 seconds to get migration status.
Consequently, when the libvirt user queried some data from QEMU during an
ongoing migration, the query timed out and libvirt canceled the migration. As a
workaround, ignore the time-out error and try querying again as libvirt checks
for migration status every 50ms. As a result, migration in a Red Hat Enterprise
Virtualization environment is no longer canceled when QEMU is slow to respond.
(BZ#1100671)

• Previously, a host device located on a PCI bus with a domain other than "0"

could not be assigned to a virtual guest using PCI passthrough. This bug has
been fixed, and QEMU is now able to assign non-0 domains in the PCI address. As
a result, host devices located on a PCI bus with a non-0 domain can now be
assigned to a guest as intended. (BZ#1100737)

Users of libvirt are advised to upgrade to these updated packages, which fix
these bugs. After installing the updated packages, libvirtd will be restarted
automatically.

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 Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 6.5 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 6.5 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• 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 6.5 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 6.5 ppc64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 i386
• Red Hat Virtualization 3 for RHEL 6 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.5 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.5 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux EUS Compute Node 6.5 x86_64
• Red Hat Enterprise Linux Server - AUS 6.5 x86_64
• Red Hat Enterprise Linux Server - TUS 6.5 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x

Fixes

• BZ - 1100642 - After migration failed in last phase, didn't resume VM on source host
• BZ - 1100671 - Migration of a VM fails if another API allowed during migration takes a long time to finish

CVEs

(none)

References

(none)