This is a note to let you know that I've just added the patch titled iommu/io-pgtable-arm: Fix iova_to_phys for block entries to the 4.7-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: iommu-io-pgtable-arm-fix-iova_to_phys-for-block-entries.patch and it can be found in the queue-4.7 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 7c6d90e2bb1a98b86d73b9e8ab4d97ed5507e37c Mon Sep 17 00:00:00 2001 From: Will Deacon <will.deacon@xxxxxxx> Date: Thu, 16 Jun 2016 18:21:19 +0100 Subject: iommu/io-pgtable-arm: Fix iova_to_phys for block entries From: Will Deacon <will.deacon@xxxxxxx> commit 7c6d90e2bb1a98b86d73b9e8ab4d97ed5507e37c upstream. The implementation of iova_to_phys for the long-descriptor ARM io-pgtable code always masks with the granule size when inserting the low virtual address bits into the physical address determined from the page tables. In cases where the leaf entry is found before the final level of table (i.e. due to a block mapping), this results in rounding down to the bottom page of the block mapping. Consequently, the physical address range batching in the vfio_unmap_unpin is defeated and we end up taking the long way home. This patch fixes the problem by masking the virtual address with the appropriate mask for the level at which the leaf descriptor is located. The short-descriptor code already gets this right, so no change is needed there. Reported-by: Robin Murphy <robin.murphy@xxxxxxx> Tested-by: Robin Murphy <robin.murphy@xxxxxxx> Signed-off-by: Will Deacon <will.deacon@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/iommu/io-pgtable-arm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/iommu/io-pgtable-arm.c +++ b/drivers/iommu/io-pgtable-arm.c @@ -576,7 +576,7 @@ static phys_addr_t arm_lpae_iova_to_phys return 0; found_translation: - iova &= (ARM_LPAE_GRANULE(data) - 1); + iova &= (ARM_LPAE_BLOCK_SIZE(lvl, data) - 1); return ((phys_addr_t)iopte_to_pfn(pte,data) << data->pg_shift) | iova; } Patches currently in stable-queue which might be from will.deacon@xxxxxxx are queue-4.7/iommu-io-pgtable-arm-fix-iova_to_phys-for-block-entries.patch queue-4.7/arm64-hibernate-handle-allocation-failures.patch queue-4.7/arm64-hibernate-avoid-potential-tlb-conflict.patch queue-4.7/arm64-debug-unmask-pstate.d-earlier.patch queue-4.7/arm64-fix-incorrect-per-cpu-usage-for-boot-cpu.patch queue-4.7/arm64-honor-nosmp-kernel-command-line-option.patch queue-4.7/arm64-vmlinux.lds-make-__rela_offset-and-__dynsym_offset-absolute.patch queue-4.7/arm64-mm-avoid-fdt_check_header-before-the-fdt-is-fully-mapped.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html