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CONFIG_ARM64_ERRATUM_2645198: Cortex-A715: 2645198: Workaround possible [ESR|FAR]_ELx corruption

General informations

The Linux kernel configuration item CONFIG_ARM64_ERRATUM_2645198:

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This option adds the workaround for ARM Cortex-A715 erratum 2645198.

If a Cortex-A715 cpu sees a page mapping permissions change from executable to non-executable, it may corrupt the ESR_ELx and FAR_ELx registers on the next instruction abort caused by permission fault.

Only user-space does executable to non-executable permission transition via mprotect() system call. Workaround the problem by doing a break-before-make TLB invalidation, for all changes to executable user space mappings.

If unsure, say Y.



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