[PATCH v2 3/6] KVM: arm64: Return EAGAIN for invalid PTE in attr walker

[Oliver Upton]

Return EAGAIN for invalid PTEs in the attr walker, signaling to the
caller that any serialization and/or invalidation can be elided.

Signed-off-by: Oliver Upton <oliver.upton at linux.dev>
---
 arch/arm64/kvm/hyp/pgtable.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
index 98818214a479..204e59e05674 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -1048,7 +1048,7 @@ static int stage2_attr_walker(const struct kvm_pgtable_visit_ctx *ctx,
 	struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops;
 
 	if (!kvm_pte_valid(ctx->old))
-		return 0;
+		return -EAGAIN;
 
 	data->level = ctx->level;
 	data->pte = pte;
-- 
2.39.0.rc0.267.gcb52ba06e7-goog