The Linux kernel is set to receive a major code cleanup through the 'KVM Chainsaw' patch series, aimed at resolving issues with the kvm_mmu structure.This update, expected for the Linux 7.3 release, involves splitting the overloaded kvm_mmu into three distinct components to improve handling of guest and host page tables.Red Hat engineer Paolo Bonzini, who maintains KVM, has merged the 'kvm-chainsaw' branch into the KVM.git next branch, paving the way for its inclusion in Linux 7.3.

The kvm_mmu structure was previously criticized for being a 'god data structure' due to its multiple overlapping responsibilities, including describing guest page tables, walking them, and building them.

The patch series addresses these issues by separating functionalities such as reserved bits detection and permission fault handling into dedicated modules.This change simplifies the codebase and enhances efficiency.

The update reflects ongoing efforts to refine KVM's performance and maintainability, crucial for virtualization technologies in modern computing environments.