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Date: Wed, 15 May 2019 16:32:34 -0700 From: Bjorn Andersson <bjorn.andersson@...aro.org> To: Will Deacon <will.deacon@....com>, Robin Murphy <robin.murphy@....com>, Joerg Roedel <joro@...tes.org> Cc: linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org, Vivek Gautam <vgautam@....qualcomm.com> Subject: [PATCH] iommu: io-pgtable: Support non-coherent page tables Describe the memory related to page table walks as non-cachable for iommu instances that are not DMA coherent. Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org> --- drivers/iommu/io-pgtable-arm.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c index 4e21efbc4459..68ff22ffd2cb 100644 --- a/drivers/iommu/io-pgtable-arm.c +++ b/drivers/iommu/io-pgtable-arm.c @@ -803,9 +803,15 @@ arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie) return NULL; /* TCR */ - reg = (ARM_LPAE_TCR_SH_IS << ARM_LPAE_TCR_SH0_SHIFT) | - (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_IRGN0_SHIFT) | - (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_ORGN0_SHIFT); + if (cfg->quirks & IO_PGTABLE_QUIRK_NO_DMA) { + reg = (ARM_LPAE_TCR_SH_IS << ARM_LPAE_TCR_SH0_SHIFT) | + (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_IRGN0_SHIFT) | + (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_ORGN0_SHIFT); + } else { + reg = (ARM_LPAE_TCR_SH_IS << ARM_LPAE_TCR_SH0_SHIFT) | + (ARM_LPAE_TCR_RGN_NC << ARM_LPAE_TCR_IRGN0_SHIFT) | + (ARM_LPAE_TCR_RGN_NC << ARM_LPAE_TCR_ORGN0_SHIFT); + } switch (ARM_LPAE_GRANULE(data)) { case SZ_4K: -- 2.18.0
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