Commit 2369f171 authored by Huang Shijie's avatar Huang Shijie Committed by Will Deacon
Browse files

arm64: crash_core: Export MODULES, VMALLOC, and VMEMMAP ranges 



The following interrelated ranges are needed by the kdump crash tool:
	MODULES_VADDR ~ MODULES_END,
	VMALLOC_START ~ VMALLOC_END,
	VMEMMAP_START ~ VMEMMAP_END

Since these values change from time to time, it is preferable to export
them via vmcoreinfo than to change the crash's code frequently.

Signed-off-by: default avatarHuang Shijie <shijie@os.amperecomputing.com>
Link: https://lore.kernel.org/r/20220209092642.9181-1-shijie@os.amperecomputing.com


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent a8a733b2

Documentation/admin-guide/kdump/vmcoreinfo.rst

+8 −0
Original line number Diff line number Diff line
@@ -494,6 +494,14 @@ architecture which is used to lookup the page-tables for the Virtual 
addresses in the higher VA range (refer to ARMv8 ARM document for

more details).



MODULES_VADDR|MODULES_END|VMALLOC_START|VMALLOC_END|VMEMMAP_START|VMEMMAP_END

-------------



Used to get the correct ranges:

	MODULES_VADDR ~ MODULES_END-1 : Kernel module space.

	VMALLOC_START ~ VMALLOC_END-1 : vmalloc() / ioremap() space.

	VMEMMAP_START ~ VMEMMAP_END-1 : vmemmap region, used for struct page array.



arm

===

arch/arm64/kernel/crash_core.c

+6 −0
Original line number Diff line number Diff line
@@ -20,6 +20,12 @@ void arch_crash_save_vmcoreinfo(void) 
{

	VMCOREINFO_NUMBER(VA_BITS);

	/* Please note VMCOREINFO_NUMBER() uses "%d", not "%x" */

	vmcoreinfo_append_str("NUMBER(MODULES_VADDR)=0x%lx\n", MODULES_VADDR);

	vmcoreinfo_append_str("NUMBER(MODULES_END)=0x%lx\n", MODULES_END);

	vmcoreinfo_append_str("NUMBER(VMALLOC_START)=0x%lx\n", VMALLOC_START);

	vmcoreinfo_append_str("NUMBER(VMALLOC_END)=0x%lx\n", VMALLOC_END);

	vmcoreinfo_append_str("NUMBER(VMEMMAP_START)=0x%lx\n", VMEMMAP_START);

	vmcoreinfo_append_str("NUMBER(VMEMMAP_END)=0x%lx\n", VMEMMAP_END);

	vmcoreinfo_append_str("NUMBER(kimage_voffset)=0x%llx\n",

						kimage_voffset);

	vmcoreinfo_append_str("NUMBER(PHYS_OFFSET)=0x%llx\n",