iommu/amd: Update Device Table in increase_address_space()

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The Device Table needs to be updated before the new page-table root
can be published in domain->pt_root. Otherwise a concurrent call to
fetch_pte might fetch a PTE which is not reachable through the Device
Table Entry.

Fixes: 92d420ec02 ("iommu/amd: Relax locking in dma_ops path")
Reported-by: Qian Cai <cai@lca.pw>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Tested-by: Qian Cai <cai@lca.pw>
Link: https://lore.kernel.org/r/20200504125413.16798-5-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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Joerg Roedel 2020-05-04 14:54:12 +02:00

parent f44a4d7e4f

commit 19c6978fba

1 changed files with 36 additions and 13 deletions

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drivers/iommu/amd_iommu.c

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