Commit 3c120143 authored Jun 06, 2018 by Zhen Lei Committed by Joerg Roedel Jul 06, 2018

iommu/amd: make sure TLB to be flushed before IOVA freed



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 <thunder.leizhen@huawei.com>
Fixes: b1516a14 ('iommu/amd: Implement flush queue')
Signed-off-by: Joerg Roedel <jroedel@suse.de>

parent 4674686d

drivers/iommu/amd_iommu.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -2407,9 +2407,9 @@ 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);