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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 v3 03/10] arm64: dump: De-constify VA_START and KASAN_SHADOW_START
Date: Wed, 12 Jun 2019 18:26:51 +0100	[thread overview]
Message-ID: <20190612172658.28522-4-steve.capper@arm.com> (raw)
In-Reply-To: <20190612172658.28522-1-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.

Specifically the VA_START and KASAN_SHADOW_START will depend on whether
or not the system is booted with 52-bit kernel VAs.

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>

---

Changed in V3 - simplified the scope of de-constifying to just VA_START
and KASAN_SHADOW_START.
---
 arch/arm64/mm/dump.c | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/mm/dump.c b/arch/arm64/mm/dump.c
index ee4e5bea8944..52c725ff49a2 100644
--- a/arch/arm64/mm/dump.c
+++ b/arch/arm64/mm/dump.c
@@ -29,11 +29,20 @@
 #include <asm/pgtable-hwdef.h>
 #include <asm/ptdump.h>
 
-static const struct addr_marker address_markers[] = {
+
+enum address_markers_idx {
+	PAGE_OFFSET_NR = 0,
+	VA_START_NR,
+#ifdef CONFIG_KASAN
+	KASAN_START_NR,
+#endif
+};
+
+static struct addr_marker address_markers[] = {
 	{ PAGE_OFFSET,			"Linear Mapping start" },
-	{ VA_START,			"Linear Mapping end" },
+	{ 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" },
@@ -405,6 +414,10 @@ void ptdump_check_wx(void)
 
 static int ptdump_init(void)
 {
+	address_markers[VA_START_NR].start_address = VA_START;
+#ifdef CONFIG_KASAN
+	address_markers[KASAN_START_NR].start_address = KASAN_SHADOW_START;
+#endif
 	ptdump_initialize();
 	ptdump_debugfs_register(&kernel_ptdump_info, "kernel_page_tables");
 	return 0;
-- 
2.20.1


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  parent reply	other threads:[~2019-06-12 17:28 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-12 17:26 [PATCH v3 00/10] 52-bit kernel + user VAs Steve Capper
2019-06-12 17:26 ` [PATCH v3 01/10] arm64: mm: Flip kernel VA space Steve Capper
2019-06-14 12:17   ` Anshuman Khandual
2019-06-17 16:09     ` Steve Capper
2019-06-26 10:56       ` Catalin Marinas
2019-06-14 13:00   ` Anshuman Khandual
2019-06-17 16:08     ` Steve Capper
2019-06-12 17:26 ` [PATCH v3 02/10] arm64: kasan: Switch to using KASAN_SHADOW_OFFSET Steve Capper
2019-06-12 17:26 ` Steve Capper [this message]
2019-06-12 17:26 ` [PATCH v3 04/10] arm64: mm: Introduce VA_BITS_MIN Steve Capper
2019-06-12 17:26 ` [PATCH v3 05/10] arm64: mm: Introduce VA_BITS_ACTUAL Steve Capper
2019-06-12 17:26 ` [PATCH v3 06/10] arm64: mm: Logic to make offset_ttbr1 conditional Steve Capper
2019-06-12 17:26 ` [PATCH v3 07/10] arm64: mm: Separate out vmemmap Steve Capper
2019-06-12 17:26 ` [PATCH v3 08/10] arm64: mm: Modify calculation of VMEMMAP_SIZE Steve Capper
2019-06-12 17:26 ` [PATCH v3 09/10] arm64: mm: Tweak PAGE_OFFSET logic Steve Capper
2019-06-12 17:26 ` [PATCH v3 10/10] arm64: mm: Introduce 52-bit Kernel VAs Steve Capper
2019-06-26 11:08 ` [PATCH v3 00/10] 52-bit kernel + user VAs Catalin Marinas

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