linux-kernel - [PATCH v3 06/60] arm64: ptdump: Allow VMALLOC

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Message-Id: <20230307140522.2311461-7-ardb@kernel.org>
Date:   Tue,  7 Mar 2023 15:04:28 +0100
From:   Ard Biesheuvel <ardb@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     linux-arm-kernel@...ts.infradead.org,
        Ard Biesheuvel <ardb@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ryan Roberts <ryan.roberts@....com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Kees Cook <keescook@...omium.org>
Subject: [PATCH v3 06/60] arm64: ptdump: Allow VMALLOC_END to be defined at boot

Extend the existing pattern for populating ptdump marker entries at
boot, and add handling of VMALLOC_END, which will cease to be a compile
time constant for configurations that support 52-bit virtual addressing.

Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
---
 arch/arm64/mm/ptdump.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/mm/ptdump.c b/arch/arm64/mm/ptdump.c
index 76d28056bd14920a..910b35f02280cbdb 100644
--- a/arch/arm64/mm/ptdump.c
+++ b/arch/arm64/mm/ptdump.c
@@ -31,7 +31,12 @@ enum address_markers_idx {
 	PAGE_END_NR,
 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
 	KASAN_START_NR,
+	KASAN_END_NR,
 #endif
+	MODULES_NR,
+	MODULES_END_NR,
+	VMALLOC_START_NR,
+	VMALLOC_END_NR,
 };
 
 static struct addr_marker address_markers[] = {
@@ -44,7 +49,7 @@ static struct addr_marker address_markers[] = {
 	{ MODULES_VADDR,		"Modules start" },
 	{ MODULES_END,			"Modules end" },
 	{ VMALLOC_START,		"vmalloc() area" },
-	{ VMALLOC_END,			"vmalloc() end" },
+	{ 0,				"vmalloc() end" },
 	{ VMEMMAP_START,		"vmemmap start" },
 	{ VMEMMAP_START + VMEMMAP_SIZE,	"vmemmap end" },
 	{ PCI_IO_START,			"PCI I/O start" },
@@ -379,6 +384,7 @@ static int __init ptdump_init(void)
 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
 	address_markers[KASAN_START_NR].start_address = KASAN_SHADOW_START;
 #endif
+	address_markers[VMALLOC_END_NR].start_address = VMALLOC_END;
 	ptdump_initialize();
 	ptdump_debugfs_register(&kernel_ptdump_info, "kernel_page_tables");
 	return 0;
-- 
2.39.2