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| author | David Stevens <stevensd@chromium.org> | 2021-09-29 11:32:59 +0900 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2021-09-29 12:50:34 +0200 |
| commit | e81e99bacc9f9347bda7808a949c1ce9fcc2bbf4 (patch) | |
| tree | a32ae98bfc2d166e2eb38dff191cddee25e72d63 /drivers/xen | |
| parent | 2e727bffbe93750a13d2414f3ce43de2f21600d2 (diff) | |
| download | linux-e81e99bacc9f9347bda7808a949c1ce9fcc2bbf4.tar.gz | |
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/xen')
| -rw-r--r-- | drivers/xen/swiotlb-xen.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c index e56a5faac395..cbdff8979980 100644 --- a/drivers/xen/swiotlb-xen.c +++ b/drivers/xen/swiotlb-xen.c @@ -380,7 +380,7 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page, */ trace_swiotlb_bounced(dev, dev_addr, size, swiotlb_force); - map = swiotlb_tbl_map_single(dev, phys, size, size, dir, attrs); + map = swiotlb_tbl_map_single(dev, phys, size, size, 0, dir, attrs); if (map == (phys_addr_t)DMA_MAPPING_ERROR) return DMA_MAPPING_ERROR; |