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| author | David Stevens <stevensd@chromium.org> | 2021-09-29 04:32:59 +0200 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2021-09-29 12:50:34 +0200 |
| commit | e81e99bacc9f9347bda7808a949c1ce9fcc2bbf4 (patch) | |
| tree | a32ae98bfc2d166e2eb38dff191cddee25e72d63 /drivers/iommu/dma-iommu.c | |
| parent | iommu/dma: Check CONFIG_SWIOTLB more broadly (diff) | |
| download | linux-e81e99bacc9f9347bda7808a949c1ce9fcc2bbf4.tar.xz linux-e81e99bacc9f9347bda7808a949c1ce9fcc2bbf4.zip | |
swiotlb: Support aligned swiotlb buffers
Add an argument to swiotlb_tbl_map_single that specifies the desired
alignment of the allocated buffer. This is used by dma-iommu to ensure
the buffer is aligned to the iova granule size when using swiotlb with
untrusted sub-granule mappings. This addresses an issue where adjacent
slots could be exposed to the untrusted device if IO_TLB_SIZE < iova
granule < PAGE_SIZE.
Signed-off-by: David Stevens <stevensd@chromium.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210929023300.335969-7-stevensd@google.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/dma-iommu.c')
| -rw-r--r-- | drivers/iommu/dma-iommu.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 85a005b268f6..289c49ead01a 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -818,8 +818,8 @@ static dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page, size_t padding_size; aligned_size = iova_align(iovad, size); - phys = swiotlb_tbl_map_single(dev, phys, size, - aligned_size, dir, attrs); + phys = swiotlb_tbl_map_single(dev, phys, size, aligned_size, + iova_mask(iovad), dir, attrs); if (phys == DMA_MAPPING_ERROR) return DMA_MAPPING_ERROR; |