iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

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

Browse Source 
[ 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>
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 Greg Kroah-Hartman
parent 0830a976e5
commit 5eb06bfce2
1 changed files with 1 additions and 1 deletions

2
drivers/iommu/amd_iommu.c

@ -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);
}