[dpdk-dev] [PATCH v7 1/1] vfio: modify spapr iommu support to use static window sizing
Thomas Monjalon
thomas at monjalon.net
Fri Nov 13 09:39:43 CET 2020
10/11/2020 18:43, David Christensen:
> The SPAPR IOMMU requires that a DMA window size be defined before memory
> can be mapped for DMA. Current code dynamically modifies the DMA window
> size in response to every new memory allocation which is potentially
> dangerous because all existing mappings need to be unmapped/remapped in
> order to resize the DMA window, leaving hardware holding IOVA addresses
> that are temporarily unmapped. The new SPAPR code statically assigns
> the DMA window size on first use, using the largest physical memory
> memory address when IOVA=PA and the highest existing memseg virtual
> address when IOVA=VA.
>
> Signed-off-by: David Christensen <drc at linux.vnet.ibm.com>
> Acked-by: Anatoly Burakov <anatoly.burakov at intel.com>
Applied, thanks
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