Sometimes offset can be greater than 4K. vt-d needs to account for that. From: Ashok Raj Signed-off-by: Ashok Raj --- drivers/iommu/intel-iommu.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 6784a05..d43b566 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -2254,10 +2254,13 @@ static int __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn, uint64_t tmp; if (!sg_res) { + size_t off = sg->offset & ~VTD_PAGE_SHIFT; sg_res = aligned_nrpages(sg->offset, sg->length); - sg->dma_address = ((dma_addr_t)iov_pfn << VTD_PAGE_SHIFT) + sg->offset; + sg->dma_address = ((dma_addr_t) + (iov_pfn + sg->offset) << VTD_PAGE_SHIFT) + off; sg->dma_length = sg->length; - pteval = page_to_phys(sg_page(sg)) | prot; + pteval = (page_to_phys(sg_page(sg)) + + (sg->offset << VTD_PAGE_SHIFT)) | prot; phys_pfn = pteval >> VTD_PAGE_SHIFT; }