KVM: arm64: Use less bits for hyp_page refcount

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The hyp_page refcount is currently encoded on 4 bytes even though we
never need to count that many objects in a page. Make it 2 bytes to save
some space in the vmemmap.

As overflows are more likely to happen as well, make sure to catch those
with a BUG in the increment function.

Signed-off-by: Quentin Perret <qperret@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210608114518.748712-8-qperret@google.com

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Quentin Perret 2021-06-08 11:45:18 +00:00 • committed by Marc Zyngier

parent 87ec060673

commit 6929586d8e

2 changed files with 2 additions and 1 deletions

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2

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

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1

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

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