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

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[ Upstream commit 3c120143f5 ]

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: b1516a1465 ('iommu/amd: Implement flush queue')
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zhen Lei
2018-06-06 10:18:46 +08:00
committed by Chris
parent 360d2163cb
commit aa545c0340
1 changed files with 1 additions and 1 deletions
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2
drivers/iommu/amd_iommu.c
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@@ -2452,9 +2452,9 @@ 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 {
queue_add(dma_dom, dma_addr, pages);
}