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Libvirt 0.9.0 Released

Today the opensource api for managing platform virtualization , libvirt, announced release 0.9.0. This release lists a very long list of bug fixes, improvements and cleanups. Below I've included only a list of the new features that comes with this release. See further below for a link to the official announcement which includes the full list of bugfixes and improvements. Management tools like virt-manager and virt-viewer , for example, use this api so you can expect to see some of these new features in the near future implemented in these clients.

The changelog for this release lists the following features

  • Support cputune cpu usage tuning (Osier Yang and Nikunj A. Dadhania)
  • Add public APIs for storage volume upload/download (Daniel P. Berrange)
  • Add public API for setting migration speed on the fly (Daniel P. Berrange)
  • Add libxenlight driver (Jim Fehlig and Markus Groß)
  • qemu: support migration to fd (Eric Blake)
  • libvirt: add virDomain{Get,Set}BlkioParameters (Gui Jianfeng)
  • setmem: introduce a new libvirt API (virDomainSetMemoryFlags) (Taku Izumi)
  • Expose event loop implementation as a public API (Daniel P. Berrange)
  • Dump the debug buffer to libvirtd.log on fatal signal (Daniel Veillard)
  • Audit support (Eric Blake)

To see the official announcement see the following link


See Also


Migration to fd

Ok, I'm a noob AND I could find it on Google… What means 'fd' in 'migration to fd' ?

I had some proposals from my colleagues liki floppy disk, firtual device, frame duffer, but it wasn't useful…

So if someone can help me on this one, I would like it.



could *not* find it on

could *not* find it on Google, sorry…

Re: Migration to fd

I had to google it as well :)

"fd" = "File Descriptor" in this case. The "fd" option can be specified in the -net argument in QEMU.

If you scroll down to the section called "Connecting VLANs To TAP Devices" on the following page, you can see an ASCII figure of how the file descriptor is used:

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