CONFIG_CAVIUM_TX2_ERRATUM_219 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm64
Cavium ThunderX2 erratum 219: PRFM between TTBR change and ISB fails
configname: CONFIG_CAVIUM_TX2_ERRATUM_219
Linux Kernel Configuration
└─>Kernel Features
└─>ARM errata workarounds via the alternatives framework
└─>Cavium ThunderX2 erratum 219: PRFM between TTBR change and ISB fails
In linux kernel since version 5.1 (release Date: 2019-05-05)
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.
If unsure, say Y.
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.
If unsure, say Y.