arm64: KVM: Avoid marking pages as XN in Stage-2 if CTR_EL0.DIC is set

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On systems where CTR_EL0.DIC is set, we don't need to perform
icache invalidation to guarantee that we'll fetch the right
instruction stream.

This also means that taking a permission fault to invalidate the
icache is an unnecessary overhead.

On such systems, we can safely leave the page as being executable.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

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Marc Zyngier 2018-04-25 17:58:20 +01:00

parent 09605e94c2

commit 2f6ea23f63

1 changed files with 12 additions and 2 deletions

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arch/arm64/include/asm/pgtable-prot.h

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