linux-kernel - [PATCH] KVM: arm64: Allow module-owned pages in host stage-2 range adjustment

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Message-ID: <20260209032421.1278325-1-kyle-jk.liao@mediatek.com>
Date: Mon, 9 Feb 2026 11:24:13 +0800
From: <kyle-jk.liao@...iatek.com>
To: Marc Zyngier <maz@...nel.org>, Oliver Upton <oupton@...nel.org>, Joey
 Gouly <joey.gouly@....com>, Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>, Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, Quentin
 Perret <qperret@...gle.com>, Vincent Donnefort <vdonnefort@...gle.com>,
	<linux-arm-kernel@...ts.infradead.org>, <kvmarm@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>
CC: <wsd_upstream@...iatek.com>, <rock.yeh@...iatek.com>,
	<hungwen.chien@...iatek.com>, kyle-jk.liao <kyle-jk.liao@...iatek.com>
Subject: [PATCH] KVM: arm64: Allow module-owned pages in host stage-2 range adjustment

From: "kyle-jk.liao" <kyle-jk.liao@...iatek.com>

The host_stage2_adjust_range() function triggers a WARN_ON when
encountering pages marked as both PKVM_NOPAGE and PKVM_MODULE_OWNED_PAGE.
This occurs when load_unaligned_zeropad() accesses memory that crosses
page boundaries, where one of the pages is module-owned.

Extend the check to accept pages with the PKVM_MODULE_OWNED_PAGE flag
in addition to PKVM_NOPAGE, preventing spurious warnings during normal
module memory access patterns.

Signed-off-by: kyle-jk.liao <kyle-jk.liao@...iatek.com>
---
 arch/arm64/kvm/hyp/nvhe/mem_protect.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
index 49db32f3ddf7..baaabf4b5112 100644
--- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c
+++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
@@ -495,6 +495,7 @@ static int host_stage2_adjust_range(u64 addr, struct kvm_mem_range *range)
 	u64 granule;
 	s8 level;
 	int ret;
+	enum pkvm_page_state state;
 
 	hyp_assert_lock_held(&host_mmu.lock);
 	ret = kvm_pgtable_get_leaf(&host_mmu.pgt, addr, &pte, &level);
@@ -505,8 +506,9 @@ static int host_stage2_adjust_range(u64 addr, struct kvm_mem_range *range)
 		return -EAGAIN;
 
 	if (pte) {
+		state = get_host_state(hyp_phys_to_page(addr));
 		WARN_ON(addr_is_memory(addr) &&
-			get_host_state(hyp_phys_to_page(addr)) != PKVM_NOPAGE);
+			(state != PKVM_NOPAGE && state != (PKVM_NOPAGE | PKVM_MODULE_OWNED_PAGE)));
 		return -EPERM;
 	}
 
-- 
2.45.2