Many KVM Updates Land In Linux 6.3

Written by Michael Larabel in Virtualization on 2 March 2023 at 06:08 AM EST. Add A Comment
A lot of Kernel-based Virtual Machine (KVM) updates were merged for the Linux 6.3 cycle to further enhance the open-source virtualization stack.

There were many changes across the board in KVM affecting the different CPU architectures with Linux 6.3. For those wondering about these KVM happenings the highlights for v6.3 include:

- KVM on x86/x86_64 has various AVIC and APICv bug fixes.

- Intel's new fast REP string features are now exposed under KVM: fast zero-length REP MOVSB, fast short REP STOSB, and fast short REP {CMPSB,SCASB}.

- PEBS (Precise Event Based Sampling) support for Intel 4th Gen Xeon Scalable "Sapphire Rapids" processors as well as future processors.

- Support for Microsoft Hyper-V extended hypercalls.

- Hyper-V invariant TSC control support.

- SBI PMU extension support for guests on RISC-V.

- KVM on ARM now provides a virtual cache topology to the guest to help avoid inconsistencies in migration on heterogeneous systems.

- Preparations toward being able to support nested virtualization on ARM with KVM.

More details on all of the KVM feature changes for Linux 6.3 via this pull.
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Michael Larabel

Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via

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