Documentation Virtualization Beat

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USB Emulation

  • Support for USB 2.0 (EHCI) devices has been added.

CDROM Emulation

  • Many fixes to comply with the ATAPI specification
  • GET_EVENT_STATUS_NOTIFICATION: Implement 'media' subcommand that helps report tray open/close, media present/absent states to guests. Newer Linux guests (kernels 2.6.38+) rely on this command to revalidate discs.
  • Major code refactoring and cleanup

Upstream release notes


  • Xen support merged into qemu


  • Stable guest TSC across migration
  • Support for VIA CPU features


  • Several memory leak fixes in all virtio devices


  • The performance of qemu-img convert has been improved
  • qemu-img convert and rebase now support the -p option which enables progress display


  • Improved the performance of creating/deleting internal snapshots

Guest Agent

  • Added the guest agent that supports snapshotting,