Messages in this thread | | | From | Joerg Roedel <> | Subject | [PATCH 0/5] iommu/amd: Fix race conditions around increase_address_space() | Date | Mon, 4 May 2020 14:54:08 +0200 |
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Hi,
Qian reported more race conditions around the dma-mapping code path in the AMD IOMMU driver. The race condtions are between increas_address_space() and fetch_pte(), there were two of them:
1) the 'pt_root' and 'mode' fields of 'struct protection_domain' relate to each other so that they must be updated together atomically.
2) The increase_address_space() function publishes the updated page-table before it has been written to the DTE. This might cause PTEs to be mapped and addresses handed to the device which are not yet reachable through the DTE entry, causing IO page-faults.
This patch-set fixes these issues, as tested by Qian Cai.
Thanks a lot again for reporting these issued and testing the fixes!
Regards,
Joerg
Joerg Roedel (5): iommu/amd: Fix race in increase_address_space()/fetch_pte() iommu/amd: Do not loop forever when trying to increase address space iommu/amd: Call domain_flush_complete() in update_domain() iommu/amd: Update Device Table in increase_address_space() iommu/amd: Do not flush Device Table in iommu_map_page()
drivers/iommu/amd_iommu.c | 198 +++++++++++++++++++++++++------- drivers/iommu/amd_iommu_types.h | 9 +- 2 files changed, 161 insertions(+), 46 deletions(-)
-- 2.17.1
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