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authorWill Deacon <will.deacon@arm.com>2015-03-23 19:07:02 +0000
committerKevin Hilman <khilman@linaro.org>2015-05-18 16:16:15 -0700
commita0121477d2c5e7b62436edca6dac4cd8058c15a5 (patch)
tree2b46b301ba1b982339c222e2f9566b095d33f4e4 /fs
parent96dade5633c3ebb68fc191fd2cc03f89fc4f57f9 (diff)
downloadlinux-linaro-stable-a0121477d2c5e7b62436edca6dac4cd8058c15a5.tar.gz
arm64: errata: add workaround for cortex-a53 erratum #845719v3.10/topic/arm64-errata
When running a compat (AArch32) userspace on Cortex-A53, 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. This patch works around the issue by writing to the contextidr_el1 register on the exception return path when returning to a 32-bit task. Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> (cherry picked from commit 905e8c5dcaa147163672b06fe9dcb5abaacbc711) [khilman: modified to remove dependency on alternatives framwork. Feature is now only compile-time selectable, and defaults to off. ] Signed-off-by: Kevin Hilman <khilman@linaro.org>
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