KVM: arm64: Always zero invalid PTEs

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kvm_set_invalid_pte() currently only clears bit 0 from a PTE because
stage2_map_walk_table_post() needs to be able to follow the anchor. In
preparation for re-using bits 63-01 from invalid PTEs, make sure to zero
it entirely by ensuring to cache the anchor's child upfront.

Acked-by: Will Deacon <will@kernel.org>
Suggested-by: Will Deacon <will@kernel.org>
Signed-off-by: Quentin Perret <qperret@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210319100146.1149909-29-qperret@google.com

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Quentin Perret 2021-03-19 10:01:36 +00:00 • committed by Marc Zyngier

parent a14307f531

commit f60ca2f932

1 changed files with 16 additions and 10 deletions

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arch/arm64/kvm/hyp/pgtable.c

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