Red Hat ENTERPRISE LINUX 5.5 - TECHNICAL NOTES Manual page 160

Chapter 1. Package Updates
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 remotely managing virtualized
systems.
These updated libvirt packages fix the following bug:
* the PIT clock is the programmable interrupt timer clock, which triggers interrupts at certain counts,
and is the default clock for Red Hat Enterprise Linux KVM guests. Guests which used the PIT
experienced clock drift due to interrupt re-injection. The "-no-kvm-pit-reinject" option has now been
added to the KVM command line, which solves potential clock drift on Red Hat Enterprise Linux KVM
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guests. (BZ#517903
All libvirt users are advised to upgrade to these updated packages, which resolve this issue.
1.107.2. RHBA-2010:0205: bug fix and enhancement update
Updated libvirt packages that fix several bugs and introduce feature enhancements are now
available for Red Hat Enterprise Linux 5.
These updated packages fix the following bugs:
• On Xen guests, the netfront and RTL8192 network drivers could run concurrently, bringing up two
network interfaces where only one was configured. The two interfaces would share the same MAC
address and could cause networking difficulties. Support for a netfront interface model has been
added, meaning only the single netfront interface is configured.
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BZ#483884
• The storage pool deletion routine did not distinguish between files and directories when removing
data. As a result, inactive storage pools could not be deleted. With this update, files and directories
are removed appropriately, allowing inactive storage pools to be deleted.
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BZ#496579
• When adding a new physical host PCI device, libvirt would not attempt to reset the PCI bus if
other functions or devices were present on the same bus. Some PCI devices could not utilized for
virtualization as a result. Attempts to reset the PCI bus will now be made, allowing affected devices
to be used for virtualization.
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BZ#500213
• Devices attached to a guest in managed mode were not automatically re-attached to the host OS
when the guest shut down. Manual intervention was required to use these devices again when the
guest is re-started. Managed mode devices will now be re-attached to the host when the guest shuts
down, allowing them to be automatically used when the guest is re-started..
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BZ#500217
• The Xen driver was not checking that guest domains with the same UUID also had the same name.
Using the virsh edit command to change the name of a Xen domain would make a new copy
of the configuration file with the new name, but not alter the original configuration file. UUIDs and
names for guest domains are now checked to ensure they match. Attempting to change the name
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https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=517903
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