arm64: Handle trapped DC CVAP

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Cache clean to PoP is subject to the same access controls as to PoC, so
if we are trapping userspace cache maintenance with SCTLR_EL1.UCI, we
need to be prepared to handle it. To avoid getting into complicated
fights with binutils about ARMv8.2 options, we'll just cheat and use the
raw SYS instruction rather than the 'proper' DC alias.

Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Robin Murphy 2017-07-25 11:55:41 +01:00 • committed by Catalin Marinas

parent 7aac405ebb

commit e1bc5d1b8e

2 changed files with 5 additions and 1 deletions

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3

arch/arm64/include/asm/esr.h

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3

arch/arm64/kernel/traps.c

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