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CONFIG_ARM64_ERRATUM_2077057: Cortex-A510: 2077057: workaround software-step corrupting SPSR_EL2

General informations

The Linux kernel configuration item CONFIG_ARM64_ERRATUM_2077057:

Help text

This option adds the workaround for ARM Cortex-A510 erratum 2077057. Affected Cortex-A510 may corrupt SPSR_EL2 when the a step exception is expected, but a Pointer Authentication trap is taken instead. The erratum causes SPSR_EL1 to be copied to SPSR_EL2, which could allow EL1 to cause a return to EL2 with a guest controlled ELR_EL2.

This can only happen when EL2 is stepping EL1.

When these conditions occur, the SPSR_EL2 value is unchanged from the previous guest entry, and can be restored from the in-memory copy.

If unsure, say Y.



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