linux-kernel - [PATCH 3/5] arm64/ptdump: Test PMD_TYPE

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Message-Id: <20241005123824.1366397-4-anshuman.khandual@arm.com>
Date: Sat,  5 Oct 2024 18:08:22 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-arm-kernel@...ts.infradead.org
Cc: Anshuman Khandual <anshuman.khandual@....com>,
	Marc Zyngier <maz@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	James Morse <james.morse@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Ard Biesheuvel <ardb@...nel.org>,
	Ryan Roberts <ryan.roberts@....com>,
	Mark Rutland <mark.rutland@....com>,
	kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] arm64/ptdump: Test PMD_TYPE_MASK for block mapping

arm64 block mapping requires given page table entry's bits[1:0] to be "01".
But now only bit[1] is checked to be clear, while also implicitly assuming
bit[0] to be set. This modifies ptdump to check both the relevant bits via
the mask PMD_TYPE_MASK and check the resultant value against PMD_TYPE_MASK.

Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will@...nel.org>
Cc: Ard Biesheuvel <ardb@...nel.org>
Cc: Ryan Roberts <ryan.roberts@....com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 arch/arm64/mm/ptdump.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/mm/ptdump.c b/arch/arm64/mm/ptdump.c
index 264c5f9b97d8..8cec0da4cff2 100644
--- a/arch/arm64/mm/ptdump.c
+++ b/arch/arm64/mm/ptdump.c
@@ -80,10 +80,10 @@ static const struct ptdump_prot_bits pte_bits[] = {
 		.set	= "CON",
 		.clear	= "   ",
 	}, {
-		.mask	= PTE_TABLE_BIT,
-		.val	= PTE_TABLE_BIT,
-		.set	= "   ",
-		.clear	= "BLK",
+		.mask	= PMD_TYPE_MASK,
+		.val	= PMD_TYPE_SECT,
+		.set	= "BLK",
+		.clear	= "   ",
 	}, {
 		.mask	= PTE_UXN,
 		.val	= PTE_UXN,
-- 
2.25.1