PCI Passthrough Module for Virtual Machine Hardware Interrupt Handling

The patent introduces a PCI passthrough module as an intermediary component within the virtualization software. This module acts as a mediator between the guest OS and physical hardware devices, enabling controlled direct access while maintaining virtualization management. The module intercepts and manages PCI configuration register accesses and interrupt handling, allowing the guest OS to directly interact with passthrough devices without full virtualization overhead, thus resolving the contradiction between isolation stability and I/O performance.

The patent segments the virtualization system by introducing a specific PCI passthrough module that handles only PCI-related operations. This segmentation allows the guest OS to have direct access to specific hardware devices through dedicated passthrough paths, while other system resources remain fully virtualized and isolated. The modular approach enables selective direct access without compromising overall system stability.

The PCI passthrough module serves as an intermediary that simplifies interrupt handling for direct-access devices. It captures interrupts from passthrough devices, processes them through the virtualization layer, and delivers them to the appropriate guest OS. This mediation abstracts the complexity of managing interrupts across virtualization boundaries, allowing the guest OS to handle interrupts as if directly accessing hardware while the module manages the underlying complexity.

The patent creates virtual PCI configuration registers that copy and emulate the structure and behavior of physical PCI configuration registers. This copying mechanism allows the guest OS to interact with familiar virtual hardware interfaces while the passthrough module translates these accesses to the physical hardware. The virtual register copies simplify the interface complexity by presenting a standardized view to the guest OS.

The patent segments hardware management control by creating a dedicated PCI passthrough module that handles only PCI device operations. This segmentation enables efficient direct access paths for PCI devices while the virtualization software maintains overall system control through the module's management interface. The modular architecture allows high-performance direct access for specific devices without requiring the virtualization software to manage every hardware operation, thus improving management efficiency.

The patent implements dynamic hardware management by allowing the PCI passthrough module to adaptively handle different PCI devices and configurations. The module can dynamically allocate passthrough resources, manage interrupt priorities, and adjust virtual PCI register mappings based on runtime conditions. This dynamic approach enables efficient resource utilization while maintaining flexible control over hardware access policies.