Interface Plug-in for Secure Device Workload Execution
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Solution Overview
Problem
Existing information processing systems face challenges in securely integrating diverse devices, such as graphics processors, into a secure processing environment without compromising the security of other enclaves, and in providing a framework that supports multiple device interface architectures.
Innovation Solution
The implementation of a secure processing environment using processor instructions like ECREATE, EADD, EEXTEND, EINIT, and EENTER, along with an interface plug-in that includes a configuration unit, access control unit, and transaction unit, allows devices to securely execute workloads within the environment while maintaining isolation and security through an enclave page cache and memory access control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If devices are integrated into a secure processing environment, then device functionality and workload execution are improved, but security isolation between different enclaves may be compromised
Solution Approach 1:
The system segments the secure processing environment into distinct enclave regions, each with isolated memory spaces and access controls. Devices are assigned to specific enclaves through enclave-specific interface plug-ins, creating segmented access paths that prevent cross-enclave interference while maintaining device functionality within authorized enclaves.
Solution Approach 2:
Enclave-specific interface plug-ins act as intermediaries between devices and the secure processing environment. These plug-ins translate device requests into enclave-compliant operations, enforcing security policies and memory access controls. The IOMMU serves as another intermediary layer that translates device I/O addresses to enclave-specific physical addresses, ensuring security isolation is maintained.
2Device complexity
If a unified secure processing environment is created, then system complexity is reduced, but flexibility to support multiple device interface architectures is limited
Solution Approach 1:
The interface plug-in framework provides universal support for multiple device interface architectures through a common structure. Each plug-in follows the same architectural pattern (configuration unit, access control unit, transaction unit), allowing different device types to be integrated using consistent methods while maintaining the ability to support diverse interface requirements.
Solution Approach 2:
The system dynamically configures enclave-specific interface plug-ins based on device requirements and enclave capabilities. The configuration units allow runtime adaptation of interface parameters, enabling the same basic framework to accommodate different device interface architectures through dynamic parameter adjustment rather than rigid fixed-structure design.
3Reliability
If strict memory access control is enforced, then security of enclaves is improved, but device access to required memory regions may be restricted
Solution Approach 1:
Memory access control is applied locally to each enclave rather than uniformly across the entire system. Each enclave has its own set of permitted I/O address ranges and memory access policies defined in its interface plug-in configuration. This allows devices to access memory regions freely within their authorized enclave while strict controls are enforced at enclave boundaries, balancing security with operational ease.
Solution Approach 2:
The IOMMU translates device I/O addresses to enclave-specific physical addresses through configurable translation tables. By changing the address space parameters dynamically based on enclave configuration, the system maintains strict memory access control while presenting a simplified address interface to devices. The translation process enforces security policies without requiring devices to directly understand or manage complex memory protection parameters.
Data Source
AI summary
Embodiments of an invention for an interface between a device and a secure processing environment are disclosed. In one embodiment, a system includes a processor, a device, and an interface plug-in. The processor includes an instruction unit and an execution unit. The instruction unit is to receive an instruction to create a secure processing environment. The execution unit is to execute an application in the secure processing environment. The device is to execute a workload for the application. The interface plug-in is to provide an interface for the device to enter the secure processing environment to execute the workload.