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QEMU 1.4 Improves USB 2.0, Block Device Mirroring

Virtualization

Published on 17 February 2013 01:17 PM EST
Written by Michael Larabel in Virtualization
1 Comment

It was only in early December that QEMU 1.3 was released with a variety of improvements and now this weekend QEMU 1.4 is out. QEMU 1.4 packs in a number of exciting features for those using QEMU in conjunction with various virtualization platforms.

Among the improvements to be utilized within QEMU 1.4.0 include Linux VFIO support for the PCI Express extended configuration space, CPU usage and throughput improvements for USB 2.0 devices, usb-tablet is now supported as an USB 2.0 device, improved support for pass-through of USB serial devices, a new usb-bot device that is like usb-storage but configured like other SCSI adapters, and virtio-net supports the multi-queue operation.

When it comes to the hardware support within QEMU 1.4, the MIPS architecture support has improved support for DSP instructions, PowerPC supports NVRAM, MSI support for the e500 adapter on PowerPC, improved S390 emulation, fixes to Intel Q35 chipset emulation (includes experimental AHCI migration support), and various other architecture/hardware improvements.

QEMU 1.4 also integrates various Xen improvements, one KVM improvement, the block device layer supports TRIM/DISCARD operations on block devices and on file-systems besides XFS while being fully asynchronous, block device mirroring support has been greatly improved, and there's a new experimental threaded back-end for virtio-block-pci.

There's a lot of exciting features for QEMU 1.4 considering the short time since QEMU 1.3. For more information on the new release, visit QEMU.org.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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