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linux/arch/arm64/include
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Will Deacon 5430a02112 arm64: errata: add workaround for cortex-a53 erratum #845719 
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.
This workaround is patched in at runtime based on the MIDR value of the
processor.

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>

Cc: <stable@vger.kernel.org> # v3.18.y
(cherry picked from commit 905e8c5dca)
Signed-off-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
History 2015-04-27 17:13:46 -04:00
..
asm arm64: errata: add workaround for cortex-a53 erratum #845719 2015-04-27 17:13:46 -04:00
uapi/asm arm/arm64: KVM: vgic: make number of irqs a configurable attribute 2014-09-18 18:48:58 -07:00