Private bug reported:
AMD RMPOPT (RMP Optimizations) refers to enhancements in the management
and performance of the Reverse Map Table (RMP), a key data structure
used in AMD confidential computing technologies such as SEV-SNP. The RMP
tracks the ownership, access permissions, and validation state of
physical memory pages to enforce strong isolation between guests,
hypervisors, and the host.
RMP operations (e.g., page state transitions, validation, permission
updates) are critical for maintaining security guarantees but can
introduce performance overhead, especially in memory-intensive and
virtualization-heavy workloads. RMPOPT aims to optimize these operations
through hardware and software improvements, such as batching updates,
reducing synchronization overhead, and improving page state transition
efficiency.
These optimizations are particularly important for scaling confidential
computing deployments, where frequent memory operations (e.g., page
allocation, migration, sharing) can impact overall system performance.
RMPOPT helps balance security enforcement with performance efficiency.
In the Linux kernel, RMPOPT impacts memory management, virtualization
(KVM), and page lifecycle handling. While core enforcement is hardware-
driven, OS and hypervisor support is required to leverage optimized
flows, reduce overhead, and ensure correctness during memory operations
involving secure pages.
Feature Request:
Requested details to be enabled on OS:
Enable support for optimized RMP operations in the OS and virtualization
stack.
Integrate RMPOPT with memory management subsystem for efficient page state
transitions.
Support batching and optimized handling of RMP updates.
Enhance KVM support for SEV-SNP with optimized RMP interactions.
Reduce overhead for page allocation, mapping, and migration in secure
environments.
Provide visibility into RMP state and operations via debugfs or tracing.
Ensure correctness and security during optimized RMP updates.
Support performance tuning and configuration for RMP-related operations.
Enable compatibility with memory overcommit, ballooning, and live migration.
Provide validation and benchmarking tools for RMPOPT effectiveness.
Document RMPOPT behavior, constraints, and integration guidelines.
Business Justification:
Improves performance of confidential computing workloads.
Reduces latency and overhead in secure memory operations.
Enables better scalability for SEV-SNP deployments.
Balances strong security guarantees with system efficiency.
Supports high-performance virtualization in cloud environments.
Aligns with next-generation confidential computing optimizations.
References:
AMD SEV-SNP Architecture Documentation
Linux Kernel KVM and Memory Management Documentation
AMD Processor Programming Reference (PPR) for RMP
Confidential Computing Consortium Resources
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Information type changed from Public to Private
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https://bugs.launchpad.net/bugs/2146717
Title:
Request for Memory Management Optimization – AMD RMPOPT (RMP
Optimizations) in Ubuntu 26.04
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