KVM: arm64: Provide {get,put}_page() stubs for early hyp allocator

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In nVHE protected mode, the EL2 code uses a temporary allocator during
boot while re-creating its stage-1 page-table. Unfortunately, the
hyp_vmmemap is not ready to use at this stage, so refcounting pages
is not possible. That is not currently a problem because hyp stage-1
mappings are never removed, which implies refcounting of page-table
pages is unnecessary.

In preparation for allowing hypervisor stage-1 mappings to be removed,
provide stub implementations for {get,put}_page() in the early allocator.

Acked-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/20211215161232.1480836-2-qperret@google.com

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Quentin Perret 2021-12-15 16:12:18 +00:00 • committed by Marc Zyngier

parent 2d761dbf7f

commit 1fac3cfb9c

1 changed files with 5 additions and 0 deletions

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

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