Hypercall Access Control Layer for Hypervisor Security
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Solution Overview
Problem
In virtualized environments, existing security measures rely heavily on hypervisor management software running on the host operating system, which may not adequately protect the hardware platform, leading to potential compromises that can impact both host and guest machines.
Innovation Solution
Implementing a hypercall access control layer that intercepts and routes hypercalls to a hypervisor for execution on a hardware platform, based on predefined access rules, providing security closer to the resource and reducing the risk of compromise by managing access between host machines, guest machines, and hypervisors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If security measures rely on hypervisor management software running on the host operating system, then ease of operation is improved, but reliability deteriorates because the host machine may be compromised
Solution Approach 1:
The patent introduces a hypercall access control layer as an intermediary component that sits between the host/guest machines and the hypervisor. This layer intercepts hypercalls and enforces access rules before allowing communication with the hypervisor, thereby providing security without requiring changes to the hypervisor management software itself. The intermediary resolves the contradiction by maintaining ease of operation while improving reliability through architectural separation of security functions.
Solution Approach 2:
The patent segments the security function from the host operating system and hypervisor management software by introducing a separate hypercall access control layer. This segmentation allows security enforcement to occur at the hypercall level independent of the host OS security mechanisms, preventing compromise propagation while maintaining operational simplicity through modular design.
2Device complexity
If security is implemented at the host machine and guest machine levels, then device complexity is reduced, but reliability deteriorates because compromised machines can adversely impact security
Solution Approach 1:
The patent adds a new dimension to the security architecture by implementing security at the hypercall level, which is a different layer than traditional host OS or guest OS security mechanisms. This dimensional shift allows security enforcement to occur at the interface between virtualized components, providing protection against compromise propagation while maintaining relative simplicity through targeted security policies at the hypercall access control layer.
3Reliability
If a hypercall access control layer is introduced to intercept and route hypercalls, then reliability is improved by providing security closer to the hardware platform, but device complexity increases
Solution Approach 1:
The hypercall access control layer serves as an intermediary that intercepts hypercalls from host and guest machines, checks access rules, and routes approved hypercalls to the hypervisor. This intermediary approach improves reliability by enforcing security at the hypercall level without requiring complex modifications to the hypervisor or hardware platform, as the access control logic resides in a separate, manageable layer.
Solution Approach 2:
The hypercall access control layer implements self-service mechanisms by maintaining its own rules database and access control policies independent of the hypervisor and host OS. This self-contained design allows the security layer to operate autonomously, improving reliability through consistent security enforcement while managing complexity through encapsulated security logic that can be configured and maintained separately.
Data Source
AI summary
Hypercalls for a host machine and guest machines to a hypervisor are intercepted and routed to the hypervisor for execution on a hardware platform, responsive to the hypercall passing hypercall access rules. The intercepting may be performed by a hypercall access control layer that reloads a hypercall table that maps hypercalls from a host machine and guest machines to hypercall handlers, to identify a hypercall access control handler as the hypercall handler for the host machine and the guest machines. Upon passing the hypercall access rules, the hypercall is passed to the hypervisor.