iommu/amd: Fix downgrading default page-sizes in alloc_pte()

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Downgrading an existing large mapping to a mapping using smaller
page-sizes works only for the mappings created with page-mode 7 (i.e.
non-default page size).

Treat large mappings created with page-mode 0 (i.e. default page size)
like a non-present mapping and allow to overwrite it in alloc_pte().

While around, make sure that we flush the TLB only if we change an
existing mapping, otherwise we might end up acting on garbage PTEs.

Fixes: 6d568ef9a6 ("iommu/amd: Allow downgrading page-sizes in alloc_pte()")
Signed-off-by: Andrei Dulea <adulea@amazon.de>

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Andrei Dulea 2019-09-13 16:42:29 +02:00 • committed by Joerg Roedel

parent 34c0989c05

commit 6ccb72f837

1 changed files with 2 additions and 1 deletions

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drivers/iommu/amd_iommu.c

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