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KVM: arm64: Report corrupted refcount at EL2

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Some of the refcount manipulation helpers used at EL2 are instrumented
to catch a corrupted state, but not all of them are treated equally. Let's
make things more consistent by instrumenting hyp_page_ref_dec_and_test()
as well.

Acked-by: Will Deacon <will@kernel.org>
Suggested-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/20211005090155.734578-6-qperret@google.com
This commit is contained in:
Quentin Perret 2021-10-05 10:01:42 +01:00 committed by Marc Zyngier
parent 1d58a17ef5
commit 7615c2a514
1 changed files with 1 additions and 0 deletions
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arch/arm64/kvm/hyp/nvhe/page_alloc.c
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@ -152,6 +152,7 @@ static inline void hyp_page_ref_inc(struct hyp_page *p)
static inline int hyp_page_ref_dec_and_test(struct hyp_page *p)
{
BUG_ON(!p->refcount);
p->refcount--;
return (p->refcount == 0);
}