KVM: arm64: Fix-up hyp stage-1 refcounts for all pages mapped at EL2

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In order to allow unmapping arbitrary memory pages from the hypervisor
stage-1 page-table, fix-up the initial refcount for pages that have been
mapped before the 'vmemmap' array was up and running so that it
accurately accounts for all existing hypervisor mappings.

This is achieved by traversing the entire hypervisor stage-1 page-table
during initialisation of EL2 and updating the corresponding
'struct hyp_page' for each valid mapping.

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Tested-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Quentin Perret <qperret@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221110190259.26861-5-will@kernel.org

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Quentin Perret 2022-11-10 19:02:37 +00:00 • committed by Marc Zyngier

parent 8e6bcc3a45

commit 0d16d12eb2

1 changed files with 43 additions and 19 deletions

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

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