Processor Performance State Security Logic Interception

A performance state security logic module is introduced as an intermediary between the operating system/microcode and the performance state control logic. This intermediary intercepts P state change requests, verifies security conditions (such as checking if the processor is executing secure code), and only allows changes when security conditions are met. This resolves the contradiction by maintaining ease of operation through automated security verification while preventing unauthorized access and security breaches.

The performance state control system is segmented into distinct functional modules: the operating system generates P state change requests, microcode processes these requests, performance state security logic verifies security conditions, and performance state control logic executes the changes. This segmentation isolates the security verification function in a dedicated module, making the system more manageable and maintainable despite the added complexity. The segmentation allows security logic to be independently implemented and updated without affecting other parts of the system.

The security logic performs preliminary verification of security conditions (such as checking the current execution state and code permissions) before allowing performance state changes to proceed. By checking security conditions in advance and blocking unauthorized requests early in the processing pipeline, the system prevents security breaches while minimizing the time impact on legitimate requests. The security verification is integrated into the existing request flow, so approved requests experience minimal additional processing time.