Merged to the mainline Linux kernel last week was a driver providing VirtualBox guest shared folder support with the driver up to now being out-of-tree but important for sharing files between the host and guest VM(s). While the driver was part of Linux 5.4-rc7, Linus Torvalds decided to delete this driver on Tuesday.

SUSE and other companies like DigitalOcean have been working on Linux core scheduling to make virtualization safer particularly in light of security vulnerabilities like L1TF and MDS. The core scheduling work is about ensuring different VMs don't share a HT sibling but rather only the same VM / trusted applications run on siblings of a core.

The initial release candidate for the upcoming QEMU 4.2 is now available as a sizable update to this important piece of the open-source Linux virtualization stack.

The mainline Linux kernel continues to see better support for Oracle VM VirtualBox with more of the guest drivers reaching the mainline kernel to provide a vastly better out-of-the-box experience.

As a late change that was merged yesterday for the Linux 5.4 kernel that will be released in the next few weeks, Xen 32-bit PV guest support has been deprecated.

Oracle today released their second public beta of the forthcoming VirtualBox 6.1 virtualization software.

The "VIRTME" project was started years ago as a set of simple tools for running a virtualized Linux kernel that uses the host distribution or basic root file-system rather than a complete Linux distribution image. There hasn't been a new release of VIRTME in years but that changed on Thursday.

The virtual GPU/display landscape particularly for having accelerated guest graphics was once non-existent and then suffering for the open-source Linux virtualization stack around QEMU, but that is no longer the case. There are options these days to rival the GPU/display offerings of VirtualBox and VMware albeit to newcomers may not be so clear.

A second batch of Kernel-based Virtual Machine (KVM) changes for the Linux 5.4 kernel have landed.

Red Hat's Andrea Arcangeli sent out an interesting patch series on Friday to micro-optimize the Kernel-based Virtual Machine (KVM) to enhance the VMEXIT performance in wake of Spectre mitigations.

The ACRN hypervisor that was open-sourced by Intel last year as a small footprint virtualization hypervisor focused on real-time computing and safety-critical applications for IoT and related embedded use-cases is up to version 1.2.

Virglrenderer 0.8 was released last week as one of the components to the "Virgl" graphics stack for getting OpenGL acceleration working within KVM+QEMU guests that is in good enough shape for handling relatively recent GL/GLES Linux games and other workloads.

QEMU 4.1 is now out as one of the important pieces to the open-source Linux virtualization stack.

In continuation of the article last week how the RISC-V Linux kernel support has been maturing and various missing gaps filled in, another feature just arrived in patch form: support for KVM virtualization.

XCP-ng, the enterprise-focused hypervisor based on Xen Server that offers a web UI for management, scalability optimizations, live migration support, and other community features, is up to version 8.0.

Coming soon to a kernel near you could be the removal of 32-bit Xen PV guest support as better jiving with Xen's architectural improvements and more of the Linux/open-source community continuing to shift focus to 64-bit x86 with trying to finally sunset 32-bit x86.

With the VirtIO standard for cross-hypervisor compatibility of different virtualized components there is a virtual IOMMU device that is now backed by a working driver in the Linux 5.3 kernel.

Back in March 2019 when Intel announced Sound Open Firmware, they also announced ACRN as a small footprint hypervisor intended for real-time and safety-critical use-cases. Now with Linux 5.3 this IoT-focused hypervisor can handle Linux guests on the ACRN hypervisor.

The past several years Siemens and others have been working on Jailhouse as a Linux-based partitioning hypervisor for bare metal appliances. Their previous release was all the way back during last year's Oktoberfest and now with construction for this year's fest kicking off at the wiesn, the developers happen to be releasing their next version of Jailhouse.

The Linux 5.3 mainline kernel will be picking up support for enabling Linux guests on the ACRN hypervisor.

A Phoronix reader pointed out to us this weekend that Intel support for live migration with their graphics virtualization technology is nearing mainline support.

Sent out earlier this month is the second version of the Xen core scheduling patches that allow for CPU core and socket-level scheduling by this virtualization hypervisor.

The Kernel-based Virtual Machine (KVM) changes were sent out on Friday of the new feature updates for the Linux 5.2 kernel that is nearing the end of its merge window.

Intel's patches for providing shared virtual address (SVA) support for IOMMU and VT-D in the Linux kernel have been revised.

For ironing out the OpenGL 4.4+ support within their VMWGFX virtual graphics driver stack and/or for starting out work on bringing up Vulkan support to guest VMs running VMware virtualization products, their longtime graphics driver team is working on emulated coherent graphics memory support.

The big QEMU 4.0 release is now available for this critical piece of the open-source Linux virtualization stack.

The Virtual I/O Device standard has christened its VIRTIO 1.1 specification this month. This is the virtualization standard around network/storage/graphics/other-hardware in mind for cross-hypervisor compatibility.

Proxmox VE 5.4 was released today as the server virtualization environment based on Debian and allows for easily deploying LXC containers and KVM-based virtual machines from a web-based interface.

For those making use of Canonical's LXD project for Linux containers, version 3.12 is now available ahead of this month's Ubuntu 19.04 release.

The Xen Project announced this week the release of Xen 4.12 as the latest feature update for this widely-used virtualization hypervisor.