Aperture Access Processor for Secure VM Memory Control
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Solution Overview
Problem
Existing processor architectures lack efficient mechanisms for secure and controlled access to apertures in virtual machine systems, leading to potential security breaches and performance overhead due to context switching during VM exits and entries.
Innovation Solution
The introduction of aperture access instructions and associated processor logic that allow for secure access to apertures by virtual machines, using access protected structures and virtual machine control structures to manage aperture allocation, protection, and access control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional processor architectures are used for VM aperture access, then general-purpose processing is maintained, but security is compromised and performance overhead increases due to context switching
Solution Approach 1:
The patent introduces a dedicated aperture access processing unit that segments the processor architecture into general-purpose cores and a specialized unit for aperture operations. This segmentation allows secure, controlled access to apertures without involving the full VM context switching machinery, thereby improving security while reducing performance overhead.
Solution Approach 2:
The aperture access processing unit acts as an intermediary between VMs and system hardware apertures. It provides a controlled interface that enables VMs to access apertures securely without direct hardware access, eliminating the need for VM exits and entries while maintaining security boundaries.
2Speed
If VMs have direct access to system hardware apertures, then access speed is improved, but security control is lost
Solution Approach 1:
The aperture access processing unit serves as an intermediary that enables fast aperture access while maintaining security control. It provides a dedicated, high-speed interface for aperture operations without requiring full VM context switching, thus achieving both speed and security control simultaneously.
Solution Approach 2:
The processing unit enables VMs to perform aperture access operations autonomously without requiring VMM intervention for each access. This self-service capability allows VMs to access apertures directly at high speed while the processing unit enforces security policies automatically.
3Reliability
If context switching is used for aperture access in VMs, then security boundaries are maintained, but performance overhead increases
Solution Approach 1:
By segmenting aperture access operations from general-purpose VM execution into a dedicated processing unit, the patent eliminates the need for context switching while maintaining security boundaries. The specialized unit handles aperture operations independently, preventing time loss associated with VM exits and entries.
Solution Approach 2:
The aperture access processing unit enables continuous aperture operations without interrupting VM execution flow. VMs can access apertures continuously through the dedicated unit without the disruptive context switching that would otherwise occur, maintaining both security boundaries and operational continuity.
Data Source
AI summary
A processor of an aspect includes a decode unit to decode an aperture access instruction, and an execution unit coupled with the decode unit. The execution unit, in response to the aperture access instruction, is to read a host physical memory address, which is to be associated with an aperture that is to be in system memory, from an access protected structure, and access data within the aperture at a host physical memory address that is not to be obtained through address translation. Other processors are also disclosed, as are methods, systems, and machine-readable medium storing aperture access instructions.