Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 99426e5e authored by Steve Capper's avatar Steve Capper Committed by Will Deacon
Browse files

arm64: dump: De-constify VA_START and KASAN_SHADOW_START 



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: default avatarSteve Capper <steve.capper@arm.com>
Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent 6bd1d0be

arch/arm64/mm/dump.c

+16 −3
Original line number Diff line number Diff line
@@ -25,11 +25,20 @@ 
#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" },
@@ -402,6 +411,10 @@ 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;