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arm64: KVM: Add workaround for Cortex-A57 erratum 834220

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Cortex-A57 parts up to r1p2 can misreport Stage 2 translation faults
when a Stage 1 permission fault or device alignment fault should
have been reported.

This patch implements the workaround (which is to validate that the
Stage-1 translation actually succeeds) by using code patching.

Cc: stable@vger.kernel.org
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Marc Zyngier
2015-11-16 10:28:18 +00:00
committed by Christoffer Dall
parent c0f0963464
commit 498cd5c32b
4 changed files with 38 additions and 1 deletions
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3
arch/arm64/include/asm/cpufeature.h
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@@ -29,8 +29,9 @@
#define ARM64_HAS_PAN 4
#define ARM64_HAS_LSE_ATOMICS 5
#define ARM64_WORKAROUND_CAVIUM_23154 6
#define ARM64_WORKAROUND_834220 7
#define ARM64_NCAPS 7
#define ARM64_NCAPS 8
#ifndef __ASSEMBLY__