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Linux Flips Around Its Behavior For Spectre-BHB Handling On ARM64
All of the ARM64 changes were merged this week to the Linux 6.15 kernel for enhancing the 64-bit ARM processor support.
Linux 6.15 on the ARM64 architecture side adds SMT run-time controls for those running the rare ARM processors that support Simultaneous Multi-Threading. As explained in the prior patch series that is now merged for Linux 6.15:"The code for detecting CPUs that are vulnerable to Spectre BHB was based on a hardcoded list of CPU IDs that were known to be affected. For more background reading on the topic: Some Qualcomm CPUs Left Exposed To Spectre Vulnerabilities On Mainline Linux.
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