Public bug reported: These patches address CVE-2025-10263, an Arm TLBI completion erratum where affected CPUs may complete a broadcast TLBI sequence before all memory accesses translated by the invalidated entry are globally observed. The mitigation enables the existing arm64 repeat-TLBI workaround so affected TLBI sequences are followed by an additional broadcast TLBI/DSB sequence.
For NVIDIA platforms, the series adds the required CPU ID coverage and enables CONFIG_ARM64_ERRATUM_4118414 in the NVIDIA kernel annotations so the mitigation is built for both Grace and Vera platforms. The platform config marks this erratum as required for Grace and Vera enablement. Verification was performed on both Grace and Vera by booting the patched kernel and confirming: - CONFIG_ARM64_ERRATUM_4118414=y - CONFIG_ARM64_WORKAROUND_REPEAT_TLBI=y - kernel log reports the active workaround: CPU features: detected: Broken broadcast TLBI completion Patches: LKML: [PATCH 0/3] arm64: errata: Mitigate TLBI errata on various Arm CPUs - https://lore.kernel.org/all/[email protected]/ [PATCH v1] arm64: errata: Mitigate TLBI errata on NVIDIA Olympus CPU - https://lore.kernel.org/all/[email protected]/ linux-next: 60349e64a6c6 arm64: cputype: Add C1-Ultra definitions d28413bfc5a2 arm64: cputype: Add C1-Premium definitions cfd391e74134 arm64: errata: Mitigate TLBI errata on various Arm CPUs ec7216f92e4e arm64: errata: Mitigate TLBI errata on NVIDIA Olympus CPU ** Affects: linux-nvidia-6.17 (Ubuntu) Importance: Undecided Status: New ** Affects: linux-nvidia-7.0 (Ubuntu) Importance: Undecided Status: New ** Affects: linux-nvidia-bos (Ubuntu) Importance: Undecided Status: New ** Also affects: linux-nvidia-7.0 (Ubuntu) Importance: Undecided Status: New ** Also affects: linux-nvidia-bos (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2156557 Title: Backport: Mitigate TLBI errata on various Arm CPUs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-nvidia-6.17/+bug/2156557/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
