Confidential VM Live Migration via Trusted NIC Offload
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Solution Overview
Problem
Live migration of virtual machines in confidential computing environments is hindered by multiple encryption operations, leading to delays and increased costs due to untrusted hypervisors, which require additional encryption and decryption steps, increasing the likelihood of incomplete migration and resource consumption.
Innovation Solution
Establish a secure communication channel between a secure hypervisor and a trusted network interface controller (NIC) to bypass intermediate encryption steps, allowing the NIC to access plaintext descriptors and perform cryptographic operations, thereby reducing encryption/decryption processes and enabling zero-copy data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple encryption operations are performed to protect confidential information during live migration, then security is improved, but migration speed deteriorates
Solution Approach 1:
The system segments the hypervisor functionality into untrusted components (for management) and trusted components (for cryptographic operations). The trusted hypervisor component performs encryption/decryption operations locally without requiring data to pass through multiple encryption layers, thereby maintaining security while reducing migration speed penalties.
Solution Approach 2:
A trusted hypervisor component acts as an intermediary between the confidential VM and the untrusted hypervisor. This intermediary performs necessary cryptographic operations and validates security requirements, allowing the untrusted hypervisor to manage migration without directly handling plaintext confidential data, thus balancing security and performance.
2Reliability
If multiple encryption and decryption steps are performed, then data protection is improved, but resource consumption increases
Solution Approach 1:
The system extracts the cryptographic operation workload from the general-purpose CPU and moves it to dedicated hardware security modules or specialized trusted execution environments within the hypervisor. This extraction reduces CPU resource consumption and energy usage while maintaining strong data protection through hardware-accelerated encryption/decryption operations.
3Reliability
If software abstractions are used to protect confidential information, then security is improved, but migration delays increase
Solution Approach 1:
The system replaces software-based cryptographic abstractions with hardware-enforced security mechanisms and direct memory access (DMA) operations. By substituting software processing with hardware-accelerated operations and eliminating unnecessary data copying through zero-copy techniques, the system maintains security protections while significantly reducing migration delays.
Data Source
AI summary
Systems and methods are directed toward migration operations, such as live migration operations, associated with confidential computing environments. Responsive to a request to migrate data, a secure hypervisor may establish a secure communication channel to a network interface controller to pass one or more keys for accessing securely stored data. The secure hypervisor may generate a descriptor associated with a memory location of the data and then pass the descriptor to the network interface controller. As a result, encryption/decryption operations may be offloaded to the network interface controller, which may use the descriptor and key to migrate the data from a source location to a destination location.