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⇱ ARM64 With Linux 6.18 To Accept Secrets From Firmware & More - Phoronix

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ARM64 With Linux 6.18 To Accept Secrets From Firmware & More

Written by Michael Larabel in Arm on 28 September 2025 at 12:00 AM EDT. 4 Comments
All of the ARM64 feature changes intended for the Linux 6.18 merge window have been submitted in advance. There are a few new features worth calling out for 64-bit ARM Linux users.

For enhancing ARM64 Confidential Computing support there is now the ability to accept secrets from firmware and mapping them with appropriate attributes. This accepting secrets from firmware is done using the ACPI Confidential Computing Event Log (CCEL) table.

Linux 6.18 ARM64 also now advertises the presence of atomic floating point instructions to user-space, extending Spectre workarounds to cover additional Arm CPU variants, GCS support for the uprobes implementation, and a variety of other fixes.

More details on all of the ARM64 feature changes for Linux 6.18 via this pull request.

Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via MichaelLarabel.com.