Merge tag 'iommu-fixes-v5.1-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

Pull iommu fixes from Joerg Roedel:

 - AMD IOMMU fix for sg-mapping with sg->offset > PAGE_SIZE

 - Fix for IOVA code to trigger the slow-path less often

 - Two fixes for Intel VT-d to avoid writing to read-only registers and
   to flush the right domain id for the default domains in scalable mode

* tag 'iommu-fixes-v5.1-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu/vt-d: Save the right domain ID used by hardware
  iommu/vt-d: Check capability before disabling protected memory
  iommu/iova: Fix tracking of recently failed iova address
  iommu/amd: fix sg->dma_address for sg->offset bigger than PAGE_SIZE

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index b319e51c379b..21cb088d6687 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2608,7 +2608,12 @@ static int map_sg(struct device *dev, struct scatterlist *sglist,
 
 	/* Everything is mapped - write the right values into s->dma_address */
 	for_each_sg(sglist, s, nelems, i) {
-		s->dma_address += address + s->offset;
+		/*
+		 * Add in the remaining piece of the scatter-gather offset that
+		 * was masked out when we were determining the physical address
+		 * via (sg_phys(s) & PAGE_MASK) earlier.
+		 */
+		s->dma_address += address + (s->offset & ~PAGE_MASK);
 		s->dma_length   = s->length;
 	}