linux-kernel - [PATCH v2 04/10] arm64: mm: Preserve existing table mappings when mapping DRAM

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Message-ID: <20260126092630.1800589-16-ardb+git@google.com>
Date: Mon, 26 Jan 2026 10:26:35 +0100
From: Ard Biesheuvel <ardb+git@...gle.com>
To: linux-kernel@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org, will@...nel.org, 
	catalin.marinas@....com, mark.rutland@....com, 
	Ard Biesheuvel <ardb@...nel.org>, Ryan Roberts <ryan.roberts@....com>, 
	Anshuman Khandual <anshuman.khandual@....com>, Liz Prucka <lizprucka@...gle.com>, 
	Seth Jenkins <sethjenkins@...gle.com>, Kees Cook <kees@...nel.org>, 
	linux-hardening@...r.kernel.org
Subject: [PATCH v2 04/10] arm64: mm: Preserve existing table mappings when
 mapping DRAM

From: Ard Biesheuvel <ardb@...nel.org>

Instead of blindly overwriting an existing table entry when mapping DRAM
regions, take care not to replace a pre-existing table entry with a
block entry. This permits the logic of mapping the kernel's linear alias
to be simplified in a subsequent patch.

Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
---
 arch/arm64/mm/mmu.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 9d39de3cfe67..28cc3cda042c 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -262,7 +262,8 @@ static int init_pmd(pmd_t *pmdp, unsigned long addr, unsigned long end,
 
 		/* try section mapping first */
 		if (((addr | next | phys) & ~PMD_MASK) == 0 &&
-		    (flags & NO_BLOCK_MAPPINGS) == 0) {
+		    (flags & NO_BLOCK_MAPPINGS) == 0 &&
+		    !pmd_table(old_pmd)) {
 			pmd_set_huge(pmdp, phys, prot);
 
 			/*
@@ -385,7 +386,8 @@ static int alloc_init_pud(p4d_t *p4dp, unsigned long addr, unsigned long end,
 		 */
 		if (pud_sect_supported() &&
 		   ((addr | next | phys) & ~PUD_MASK) == 0 &&
-		    (flags & NO_BLOCK_MAPPINGS) == 0) {
+		    (flags & NO_BLOCK_MAPPINGS) == 0 &&
+		    !pud_table(old_pud)) {
 			pud_set_huge(pudp, phys, prot);
 
 			/*
-- 
2.52.0.457.g6b5491de43-goog