VirtualBox 7.1.4 support

This release adds support for VirtualBox 7.1.4 and consolidates the patch series.

Virtio-gpu GPU model has been removed for the time being. We may reactivate it when
Intel SR-IOV graphics support is upstreamed.

VirtualBox 7.0.20 support

This release adds support for VirtualBox 7.0.20 and consolidates the patch series.

Improved nested virtualization handling and hardening support.

This release improves nested virtualization handling on VMX hardware and also adds support to build the KVM backend with hardening support.

VirtualBox 7.0.18 support

This release adds support for VirtualBox 7.0.18 and consolidates the patch series.

Nested Virtualization Support

This release adds nested virtualization support to the KVM-backend for VirtualBox.

Guest Performance Optimizations

This release properly initializes CPUID for the guest. This allows the guest to use more CPU features. It also fixes an issue where the guest
would apply certain CPU issue mitigations needlessly, for example for Meltdown.

SR-IOV Graphics Acceleration

Running graphics-intensive workloads in VirtualBox VMs is now possible with the power of Intel's SR-IOV technology for Iris Xe GPUs. We provide a step-by-step guide on how to set up your host and guest systems to leverage this performance booster, as well as some pre-built packages for easy testing.

Additional Hyper-V Enlightenments

In this release, we update the KVM backend to leverage KVM's implementation of enhanced Hyper-V enlightenments (e.g., SynIC, STimer). These improvements further boost the performance of Windows guests.

KVM Backend

Our KVM Backend allows users to run VirtualBox on Linux hosts without the custom kernel module and instead leverage KVM. This enables simultaneous operation of Qemu and VirtualBox as well as the use of advanced hardware virtualization features (e.g., interrupt virtualization) offered by KVM.