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iommu/io-pgtable-arm: Ensure ARM_64_LPAE_S2_TCR_RES1 is unsigned

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ARM_64_LPAE_S2_TCR_RES1 is intended to map to bit 31 of the VTCR register,
which is required to be set to 1 by the architecture. Unfortunately, we
accidentally treat this as a signed quantity which means we also set the
upper 32 bits of the VTCR to one, and they are required to be zero.

Treat ARM_64_LPAE_S2_TCR_RES1 as unsigned to avoid the unwanted
sign-extension up to 64 bits.

Cc: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Will Deacon 2020-01-10 12:22:16 +00:00
parent 7618e47909
commit 6f932ad369
1 changed files with 1 additions and 1 deletions
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2
drivers/iommu/io-pgtable-arm.c
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@ -101,7 +101,7 @@
/* Register bits */
#define ARM_32_LPAE_TCR_EAE (1 << 31)
#define ARM_64_LPAE_S2_TCR_RES1 (1 << 31)
#define ARM_64_LPAE_S2_TCR_RES1 (1U << 31)
#define ARM_LPAE_TCR_EPD1 (1 << 23)