KVM: arm64: Move hyp state to hyp_vmemmap

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Tracking the hypervisor's ownership state into struct hyp_page has
several benefits, including allowing far more efficient lookups (no
page-table walk needed) and de-corelating the state from the presence
of a mapping. This will later allow to map pages into EL2 stage-1 less
proactively which is generally a good thing for security. And in the
future this will help with tracking the state of pages mapped into the
hypervisor's private range without requiring an alias into the 'linear
map' range.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Quentin Perret <qperret@google.com>
Link: https://lore.kernel.org/r/20250416152648.2982950-6-qperret@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>

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Quentin Perret 2025-04-16 15:26:45 +00:00 • committed by Marc Zyngier

parent ba5b2e5b9d

commit 3390b3cbb6

3 changed files with 53 additions and 33 deletions

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29

arch/arm64/kvm/hyp/include/nvhe/memory.h

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51

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

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6

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

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