diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-12-06 10:53:02 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-12-06 10:53:02 -0800 |
| commit | e56d565d67ae7dd6b25ce6a331c43e691ff1d247 (patch) | |
| tree | 1e2b8a5d87c9f05dce459754a2689b06ddd4a784 | |
| parent | f9efc944474742ad952c15c092a901d88ed83c71 (diff) | |
| parent | 29a90b70893817e2f2bb3cea40a29f5308e21b21 (diff) | |
Merge tag 'iommu-v4.15-rc3' of git://github.com/awilliam/linux-vfio
Pull IOMMU fix from Alex Williamson:
"Fix VT-d handling of scatterlists where sg->offset exceeds PAGE_SIZE"
* tag 'iommu-v4.15-rc3' of git://github.com/awilliam/linux-vfio:
iommu/vt-d: Fix scatterlist offset handling
| -rw-r--r-- | drivers/iommu/intel-iommu.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index a0babdbf7146..4a2de34895ec 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -2250,10 +2250,12 @@ static int __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn, uint64_t tmp; if (!sg_res) { + unsigned int pgoff = sg->offset & ~PAGE_MASK; + 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 << VTD_PAGE_SHIFT) + pgoff; sg->dma_length = sg->length; - pteval = page_to_phys(sg_page(sg)) | prot; + pteval = (sg_phys(sg) - pgoff) | prot; phys_pfn = pteval >> VTD_PAGE_SHIFT; } @@ -3787,7 +3789,7 @@ static int intel_nontranslate_map_sg(struct device *hddev, for_each_sg(sglist, sg, nelems, i) { BUG_ON(!sg_page(sg)); - sg->dma_address = page_to_phys(sg_page(sg)) + sg->offset; + sg->dma_address = sg_phys(sg); sg->dma_length = sg->length; } return nelems; |