Merge tag 'kvmarm-fixes-5.4-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmar...

[tomoyo/tomoyo-test1.git] / arch / arm64 / Kconfig

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 950a56b..3f047af 100644 (file)
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -616,6 +616,23 @@ config CAVIUM_ERRATUM_30115
 
          If unsure, say Y.
 
+config CAVIUM_TX2_ERRATUM_219
+       bool "Cavium ThunderX2 erratum 219: PRFM between TTBR change and ISB fails"
+       default y
+       help
+         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.
+
 config QCOM_FALKOR_ERRATUM_1003
        bool "Falkor E1003: Incorrect translation due to ASID change"
        default y