[PATCH 4/7] iommu/amd: make sure TLB to be flushed before IOVA freed
From: Zhen Lei <hidden>
Date: 2018-05-31 07:43:55
Also in:
linux-arm-msm, linux-iommu, linux-mediatek, lkml
Subsystem:
iommu subsystem, the rest · Maintainers:
Joerg Roedel, Will Deacon, Linus Torvalds
Although the mapping has already been removed in the page table, it maybe still exist in TLB. Suppose the freed IOVAs is reused by others before the flush operation completed, the new user can not correctly access to its meomory. Signed-off-by: Zhen Lei <redacted> --- drivers/iommu/amd_iommu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 8fb8c73..93aa389 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c@@ -2402,9 +2402,9 @@ static void __unmap_single(struct dma_ops_domain *dma_dom, } if (amd_iommu_unmap_flush) { - dma_ops_free_iova(dma_dom, dma_addr, pages); domain_flush_tlb(&dma_dom->domain); domain_flush_complete(&dma_dom->domain); + dma_ops_free_iova(dma_dom, dma_addr, pages); } else { pages = __roundup_pow_of_two(pages); queue_iova(&dma_dom->iovad, dma_addr >> PAGE_SHIFT, pages, 0);
--
1.8.3