ARM64 BBML3 Feature Ready With Linux 7.3, NVIDIA Olympus Workarounds - Phoronix

With the release of Linux 7.3, ARM64 architecture is set to receive several key enhancements, most notably the introduction of the BBML3 (Break-Before-Make Level 3) feature. BBML3 improves page table ... Read original →

The inclusion of BBML3 in Linux 7.3 marks a pivotal advancement in ARM64 memory management, directly enhancing virtualization and page table transition efficiency—especially critical for NVIDIA's Olympus and AWS Graviton5 platforms. However, the workaround for MMIO ordering issues in Olympus cores reveals underlying hardware design flaws, underscoring the complexity of software-hardware co-design in high-performance chips. The disabling of in-kernel BTI due to livepatching conflicts indicates ongoing challenges in kernel-level security integration. From a competitive standpoint, this update intensifies strategic rivalry among ARM, NVIDIA, and Marvell as they navigate new architecture support. In the near term, as more SoC vendors adopt these features, Linux kernel maturity will accelerate, but hardware vendors must prepare for increased long-term maintenance burdens.