linux-kernel - [PATCH v5 2/6] arm64: add APTable encoding to pagetable defs

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Date: Mon, 24 Jun 2024 17:12:19 -0500
From: Maxwell Bland <mbland@...orola.com>
To: linux-mm@...ck.org
Cc: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ard Biesheuvel <ardb@...nel.org>, Mark Rutland <mark.rutland@....com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Maxwell Bland <mbland@...orola.com>,
        Alexandre Ghiti <alexghiti@...osinc.com>,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v5 2/6] arm64: add APTable encoding to pagetable defs

Add in the APTable permission bit encoding to describe table-level
hierarchical access control

Signed-off-by: Maxwell Bland <mbland@...orola.com>
---
 arch/arm64/include/asm/pgtable-hwdef.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/include/asm/pgtable-hwdef.h b/arch/arm64/include/asm/pgtable-hwdef.h
index 9943ff0af4c9..8c229fc96c0a 100644
--- a/arch/arm64/include/asm/pgtable-hwdef.h
+++ b/arch/arm64/include/asm/pgtable-hwdef.h
@@ -146,6 +146,11 @@
 #define PMD_SECT_UXN		(_AT(pmdval_t, 1) << 54)
 #define PMD_TABLE_PXN		(_AT(pmdval_t, 1) << 59)
 #define PMD_TABLE_UXN		(_AT(pmdval_t, 1) << 60)
+/*
+ * APTable[1:0] encoding for hierarchical data access control
+ */
+#define PMD_TABLE_KERN		(_AT(pmdval_t, 1) << 61)
+#define PMD_TABLE_PRDONLY	(_AT(pmdval_t, 1) << 62)
 
 /*
  * AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers).
-- 
2.43.0