KVM: arm64: Prevent unconditional donation of unmapped regions from the host

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Since host stage-2 mappings are created lazily, we cannot rely solely on
the pte in order to recover the target physical address when checking a
host-initiated memory transition as this permits donation of unmapped
regions corresponding to MMIO or "no-map" memory.

Instead of inspecting the pte, move the addr_is_allowed_memory() check
into the host callback function where it is passed the physical address
directly from the walker.

Cc: Quentin Perret <qperret@google.com>
Fixes: e82edcc75c ("KVM: arm64: Implement do_share() helper for sharing memory")
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230518095844.1178-1-will@kernel.org

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Will Deacon 2023-05-18 10:58:44 +01:00 • committed by Marc Zyngier

parent 6254873226

commit 09cce60bdd

1 changed files with 7 additions and 7 deletions

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arch/arm64/kvm/hyp/nvhe/mem_protect.c

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