Diffstat (limited to 'arch/arm64/Kconfig')
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 0c9e4d1086f7..196d179119ff 100644
@@ -161,6 +161,32 @@ endmenu
menu "Kernel Features"
+menu "ARM errata workarounds"
+ bool "Cortex-A53: 845719: a load might read incorrect data"
+ depends on COMPAT
+ default n
+ This option adds an alternative code sequence to work around ARM
+ erratum 845719 on Cortex-A53 parts up to r0p4.
+ When running a compat (AArch32) userspace on an affected Cortex-A53
+ part, a load at EL0 from a virtual address that matches the bottom 32
+ bits of the virtual address used by a recent load at (AArch64) EL1
+ might return incorrect data.
+ The workaround is to write the contextidr_el1 register on exception
+ return to a 32-bit task.
+ 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.
+ If unsure, say Y.
bool "Enable 64KB pages support"