Linux 5.8 Supports Nested AMD Live Migration With KVM

Written by Michael Larabel in Virtualization on 11 June 2020 at 12:09 AM EDT. 1 Comment
Sent in last week to the Linux 5.8 mainline kernel were all the Kernel-based Virtual Machine (KVM) updates.

Arguably most notable to the KVM changes for Linux 5.8 is nested AMD live migration support for properly dealing with the live migration of KVM VMs running within a virtual machine. Red Hat's Paolo Bonzini who oversees the KVM code has been working on this migration support for the AMD nSVM code and is now in place for the 5.8 kernel.

The KVM Linux 5.8 highlights amount to:

- A rework of the TLB flushing code for x86/x86_64 systems as well as reworking of the event injection code.

- Nested AMD live migration support as well as improving the nested AMD event injection capabilities.

- Interrupt-based delivery of async page ready requests.

- Async page fault clean-ups.

- Code clean-ups thanks to the recent retiring of Arm 32-bit KVM host support.

- Other fixes and improvements.

More details on the KVM changes for Linux 5.8 via this Git merge.
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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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