ChangeLog/1.3: Difference between revisions

Revision as of 15:21, 1 October 2012

Emulation of the MC146818 real-time clock (used on PC and several other boards) does not wake up QEMU anymore every second to update the clock.
USB3 has been vastly improved, including support for USB mass storage devices and MSI-X support for the XHCI controller.
USB redirection now supports live migration.
The AHCI controller was fixed and supports recent Windows versions.

Some problems were fixed leading to bad receive performance of E1000 and Xen network cards.

qemu-img now can output information in JSON format using "qemu-img info --output=json".
Glusterfs volumes can be accessed with "gluster://" URIs for "-drive" and similar options. Optionally the transport can also be specified, as in "gluster+tcp://" (other supported transports are "unix" and "rdma").
Streaming can now be paused and resumed from the monitor.
Options on the QMP streaming command direct the job to pause on encountering errors, or to ignore them altogether.
A new block job is supported: live block commit (also known as "snapshot deletion") moves data from an image to another in the backing file chain. With the current implementation of QEMU 1.3, the "source" image may not be the active one.

QEMU will only send changed screen content to the Spice client when running in legacy VGA mode.
Seamless migration?

QEMU now supports "old-style" PCI device assignment, which was the last missing feature from the qemu-kvm fork. Despite some remaining minor differences between qemu-kvm and QEMU, it is possible to switch from qemu-kvm to QEMU as soon as your guests can be rebooted. Note that live migration from qemu-kvm to QEMU is not supported.

@@ Line 28: / Line 28: @@
 * Glusterfs volumes can be accessed with "gluster://" URIs for "-drive" and similar options. Optionally the transport can also be specified, as in "gluster+tcp://" (other supported transports are "unix" and "rdma").
 * Streaming can now be paused and resumed from the monitor.
-* The QMP streaming command can now pause on encountering errors, or ignore them altogether.
+* Options on the QMP streaming command direct the job to pause on encountering errors, or to ignore them altogether.
 * A new block job is supported: live block commit (also known as "snapshot deletion") moves data from an image to another in the backing file chain.  With the current implementation of QEMU 1.3, the "source" image may not be the active one.