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

JIRA: https://issues.redhat.com/browse/RHEL-32199

Upstream Status: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

commit 2369f17
Author: Huang Shijie <shijie@os.amperecomputing.com>
Date:   Wed Feb 9 09:26:42 2022 +0000

    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: Huang Shijie <shijie@os.amperecomputing.com>
    Link: https://lore.kernel.org/r/20220209092642.9181-1-shijie@os.amperecomputing.com
    Signed-off-by: Will Deacon <will@kernel.org>

Signed-off-by: Baoquan He <bhe@redhat.com>

Author: Baoquan He

Documentation/admin-guide/kdump/vmcoreinfo.rst

@@ -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

@@ -21,6 +21,12 @@ 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",