diff mbox series

[AUTOSEL,4.14,12/87] iommu/amd: make sure TLB to be flushed before IOVA freed

Message ID 20180917030220.245686-12-alexander.levin@microsoft.com
State Superseded
Headers show
Series None | expand

Commit Message

Sasha Levin Sept. 17, 2018, 3:02 a.m. UTC 
From: Zhen Lei <thunder.leizhen@huawei.com>


[ Upstream commit 3c120143f584360a13614787e23ae2cdcb5e5ccd ]

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: b1516a14657a ('iommu/amd: Implement flush queue')
Signed-off-by: Joerg Roedel <jroedel@suse.de>

Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>

---
 drivers/iommu/amd_iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

-- 
2.17.1
diff mbox series

Patch

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 10190e361a13..01746e7b90de 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2400,9 +2400,9 @@  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);