[PATCH v2 05/12] arm64: dump: Make kernel page table dumper dynamic again

From: Steve Capper <steve.capper@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: crecklin@redhat.com, ard.biesheuvel@linaro.org,
	marc.zyngier@arm.com, catalin.marinas@arm.com,
	bhsharma@redhat.com, will.deacon@arm.com
Subject: [PATCH v2 05/12] arm64: dump: Make kernel page table dumper dynamic again
Date: Tue, 28 May 2019 17:10:19 +0100	[thread overview]
Message-ID: <20190528161026.13193-6-steve.capper@arm.com> (raw)
In-Reply-To: <20190528161026.13193-1-steve.capper@arm.com>

The kernel page table dumper assumes that the placement of VA regions is
constant and determined at compile time. As we are about to introduce
variable VA logic, we need to be able to determine certain regions at
boot time.

This patch adds logic to the kernel page table dumper s.t. these regions
can be computed at boot time.

Signed-off-by: Steve Capper <steve.capper@arm.com>
---
 arch/arm64/mm/dump.c | 58 +++++++++++++++++++++++++++++++++++---------
 1 file changed, 47 insertions(+), 11 deletions(-)

diff --git a/arch/arm64/mm/dump.c b/arch/arm64/mm/dump.c
index ee4e5bea8944..f5fd6d6557fc 100644
--- a/arch/arm64/mm/dump.c
+++ b/arch/arm64/mm/dump.c
@@ -29,23 +29,45 @@
 #include <asm/pgtable-hwdef.h>
 #include <asm/ptdump.h>
 
-static const struct addr_marker address_markers[] = {
-	{ PAGE_OFFSET,			"Linear Mapping start" },
-	{ VA_START,			"Linear Mapping end" },
+
+enum address_markers_idx {
+	PAGE_OFFSET_NR = 0,
+	VA_START_NR,
+#ifdef CONFIG_KASAN
+	KASAN_START_NR,
+	KASAN_END_NR,
+#endif
+	MODULES_START_NR,
+	MODULES_END_NR,
+	VMALLOC_START_NR,
+	VMALLOC_END_NR,
+	FIXADDR_START_NR,
+	FIXADDR_END_NR,
+	PCI_START_NR,
+	PCI_END_NR,
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+	VMEMMAP_START_NR,
+#endif
+	END_NR
+};
+
+static struct addr_marker address_markers[] = {
+	{ 0 /* PAGE_OFFSET */,		"Linear Mapping start" },
+	{ 0 /* VA_START */,		"Linear Mapping end" },
 #ifdef CONFIG_KASAN
-	{ KASAN_SHADOW_START,		"Kasan shadow start" },
+	{ 0 /* KASAN_SHADOW_START */,	"Kasan shadow start" },
 	{ KASAN_SHADOW_END,		"Kasan shadow end" },
 #endif
 	{ MODULES_VADDR,		"Modules start" },
 	{ MODULES_END,			"Modules end" },
 	{ VMALLOC_START,		"vmalloc() area" },
-	{ VMALLOC_END,			"vmalloc() end" },
-	{ FIXADDR_START,		"Fixmap start" },
-	{ FIXADDR_TOP,			"Fixmap end" },
-	{ PCI_IO_START,			"PCI I/O start" },
-	{ PCI_IO_END,			"PCI I/O end" },
+	{ 0 /* VMALLOC_END */,		"vmalloc() end" },
+	{ 0 /* FIXADDR_START */,	"Fixmap start" },
+	{ 0 /* FIXADDR_TOP */,		"Fixmap end" },
+	{ 0 /* PCI_IO_START */,		"PCI I/O start" },
+	{ 0 /* PCI_IO_END */,		"PCI I/O end" },
 #ifdef CONFIG_SPARSEMEM_VMEMMAP
-	{ VMEMMAP_START,		"vmemmap" },
+	{ 0 /* VMEMMAP_START */,	"vmemmap" },
 #endif
 	{ -1,				NULL },
 };
@@ -380,7 +402,6 @@ static void ptdump_initialize(void)
 static struct ptdump_info kernel_ptdump_info = {
 	.mm		= &init_mm,
 	.markers	= address_markers,
-	.base_addr	= PAGE_OFFSET,
 };
 
 void ptdump_check_wx(void)
@@ -405,6 +426,21 @@ void ptdump_check_wx(void)
 
 static int ptdump_init(void)
 {
+	kernel_ptdump_info.base_addr = PAGE_OFFSET;
+	address_markers[PAGE_OFFSET_NR].start_address = PAGE_OFFSET;
+	address_markers[VA_START_NR].start_address = VA_START;
+#ifdef CONFIG_KASAN
+	address_markers[KASAN_START_NR].start_address = KASAN_SHADOW_START;
+#endif
+	address_markers[VMALLOC_END_NR].start_address = VMALLOC_END;
+	address_markers[FIXADDR_START_NR].start_address = FIXADDR_START;
+	address_markers[FIXADDR_END_NR].start_address = FIXADDR_TOP;
+	address_markers[PCI_START_NR].start_address = PCI_IO_START;
+	address_markers[PCI_END_NR].start_address = PCI_IO_END;
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+	address_markers[VMEMMAP_START_NR].start_address = VMEMMAP_START;
+#endif
+
 	ptdump_initialize();
 	ptdump_debugfs_register(&kernel_ptdump_info, "kernel_page_tables");
 	return 0;
-- 
2.20.1


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