KVM Virtualization Gets New Features In Linux 3.10
Written by Michael Larabel in Hardware on 5 May 2013 at 11:05 AM EDT. 1 Comment
The Linux 3.10 kernel will feature new improvements and features when it comes to KVM (Kernel-based Virtual Machine) virtualization.

The KVM pull request for the Linux 3.10 merge window was volleyed on Sunday morning to the kernel mailing list. Interesting bits include:

- A new emulated device API.

- The KVM x86/x86_64 virtualization now supports VMCS shadow support and other nested VMX improvements. In digging through this "VMCS shadow" feature, from another patch it's explaned as, "On new Intel platform, it introduces a new feature called VMCS shadowing, where non-root VMREAD/VMWRITE will not trigger VM-Exit, and the hardware will read/write the virtual VMCS instead. This is proved to have performance improvement with the feature."

- APIC virtualization and posted interrupt hardware support for x86 virtualization.

- The other prominent x86 KVM change is optimized MMIO SPTE zapping.

- PowerPC KVM virtualization in this next kernel features in-kernel MPIC emulation with IRQFD support, in-kernel XICS emulation, and E6500 support.

- ARM and S390 Linux users also have some small changes to KVM in Linux 3.10.
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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 Twitter or contacted via MichaelLarabel.com.

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