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CONFIG_ARM64_ERRATUM_834220: Cortex-A57: 834220: Stage 2 translation fault might be incorrectly reported in presence of a Stage 1 fault

General informations

The Linux kernel configuration item CONFIG_ARM64_ERRATUM_834220:

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This option adds an alternative code sequence to work around ARM erratum 834220 on Cortex-A57 parts up to r1p2.

Affected Cortex-A57 parts might report a Stage 2 translation fault as the result of a Stage 1 fault for load crossing a page boundary when there is a permission or device memory alignment fault at Stage 1 and a translation fault at Stage 2.

The workaround is to verify that the Stage 1 translation doesn't generate a fault before handling the Stage 2 fault. Please note that this does not necessarily enable the workaround, as it depends on the alternative framework, which will only patch the kernel if an affected CPU is detected.

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