linux-kernel - [PATCH] KVM: arm64: Fix the upper limit of the walker range

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Message-ID: <20250114145050.563658-2-sebastianene@google.com>
Date: Tue, 14 Jan 2025 14:50:51 +0000
From: Sebastian Ene <sebastianene@...gle.com>
To: catalin.marinas@....com, joey.gouly@....com, kvmarm@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	maz@...nel.org, oliver.upton@...ux.dev, sebastianene@...gle.com, 
	suzuki.poulose@....com, will@...nel.org, yuzenghui@...wei.com
Subject: [PATCH] KVM: arm64: Fix the upper limit of the walker range

Prevent the walker from running into weeds when walking an
entire address range.

Signed-off-by: Sebastian Ene <sebastianene@...gle.com>
---
 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 40bd55966..2ffb5571e 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -260,7 +260,7 @@ static int _kvm_pgtable_walk(struct kvm_pgtable *pgt, struct kvm_pgtable_walk_da
 {
 	u32 idx;
 	int ret = 0;
-	u64 limit = BIT(pgt->ia_bits);
+	u64 limit = BIT(pgt->ia_bits) - 1;
 
 	if (data->addr > limit || data->end > limit)
 		return -ERANGE;
-- 
2.47.1.688.g23fc6f90ad-goog