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CONFIG_ARM64_ERRATUM_1286807: Cortex-A76: Modification of the translation table for a virtual address might lead to read-after-read ordering violation

General informations

The Linux kernel configuration item CONFIG_ARM64_ERRATUM_1286807:

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This option adds a workaround for ARM Cortex-A76 erratum 1286807.

On the affected Cortex-A76 cores (r0p0 to r3p0), if a virtual address for a cacheable mapping of a location is being accessed by a core while another core is remapping the virtual address to a new physical page using the recommended break-before-make sequence, then under very rare circumstances TLBI+DSB completes before a read using the translation being invalidated has been observed by other observers. The workaround repeats the TLBI+DSB operation.

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