KVM: arm64: Implement do_unshare() helper for unsharing memory

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Tearing down a previously shared memory region results in the borrower
losing access to the underlying pages and returning them to the "owned"
state in the owner.

Implement a do_unshare() helper, along the same lines as do_share(), to
provide this functionality for the host-to-hyp case.

Reviewed-by: Andrew Walbran <qwandor@google.com>
Signed-off-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/20211215161232.1480836-13-qperret@google.com

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Will Deacon 2021-12-15 16:12:29 +00:00 • committed by Marc Zyngier

parent 1ee32109fd

commit 376a240f03

1 changed files with 115 additions and 0 deletions

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

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