iommufd/iova_bitmap: Consider page offset for the pages to be pinned

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For small bitmaps that aren't PAGE_SIZE aligned *and* that are less than
512 pages in bitmap length, use an extra page to be able to cover the
entire range e.g. [1M..3G] which would be iterated more efficiently in a
single iteration, rather than two.

Fixes: b058ea3ab5 ("vfio/iova_bitmap: refactor iova_bitmap_set() to better handle page boundaries")
Link: https://lore.kernel.org/r/20240202133415.23819-10-joao.m.martins@oracle.com
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Tested-by: Avihai Horon <avihaih@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

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Joao Martins 2024-02-02 13:34:15 +00:00 • committed by Jason Gunthorpe

parent fe13166f05

commit 4bbcbc6ea2

1 changed files with 7 additions and 6 deletions

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drivers/iommu/iommufd/iova_bitmap.c

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