KVM: arm64: Change the layout of enum pkvm_page_state

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The 'concrete' (a.k.a non-meta) page states are currently encoded using
software bits in PTEs. For performance reasons, the abstract
pkvm_page_state enum uses the same bits to encode these states as that
makes conversions from and to PTEs easy.

In order to prepare the ground for moving the 'concrete' state storage
to the hyp vmemmap, re-arrange the enum to use bits 0 and 1 for this
purpose.

No functional changes intended.

Tested-by: Fuad Tabba <tabba@google.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Quentin Perret <qperret@google.com>
Link: https://lore.kernel.org/r/20241218194059.3670226-2-qperret@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>

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Quentin Perret 2024-12-18 19:40:42 +00:00 • committed by Marc Zyngier

parent 78d4f34e21

commit a1a1f1ff1f

1 changed files with 9 additions and 7 deletions

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

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