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CONFIG_CAVIUM_TX2_ERRATUM_219: Cavium ThunderX2 erratum 219: PRFM between TTBR change and ISB fails

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The Linux kernel configuration item CONFIG_CAVIUM_TX2_ERRATUM_219:

Help text

On Cavium ThunderX2, a load, store or prefetch instruction between a TTBR update and the corresponding context synchronizing operation can cause a spurious Data Abort to be delivered to any hardware thread in the CPU core.

Work around the issue by avoiding the problematic code sequence and trapping KVM guest TTBRx_EL1 writes to EL2 when SMT is enabled. The trap handler performs the corresponding register access, skips the instruction and ensures context synchronization by virtue of the exception return.

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