kexec-tools/kexec-tools-2.0.28-makedumfpile-0001-PATCH-ppc64-get-vmalloc-start-address-from-vmcoreinf.patch

From: Coiby Xu <coxu@redhat.com>

Subject: [PATCH] ppc64: get vmalloc start address from vmcoreinfo

Bugzilla: https://bugzilla.redhat.com/2269991

commit 94241fd2feed059227a243618f2acc6aabf366e8
Author: Aditya Gupta <adityag@linux.ibm.com>
Date:   Sat Feb 24 00:33:42 2024 +0530

    [PATCH] ppc64: get vmalloc start address from vmcoreinfo
    
    Below error was noticed when running makedumpfile on linux-next kernel
    crash (linux-next tag next-20240121):
    
        Checking for memory holes : [100.0 %] | readpage_elf: Attempt to read non-existent page at 0xc000000000000.
        [ 17.551718] kdump.sh[404]: readmem: type_addr: 0, addr:c00c000000000000, size:16384
        [ 17.551793] kdump.sh[404]: __exclude_unnecessary_pages: Can't read the buffer of struct page.
        [ 17.551864] kdump.sh[404]: create_2nd_bitmap: Can't exclude unnecessary pages.
        [ 17.562632] kdump.sh[404]: The kernel version is not supported.
        [ 17.562708] kdump.sh[404]: The makedumpfile operation may be incomplete.
        [ 17.562773] kdump.sh[404]: makedumpfile Failed.
        [ 17.564335] kdump[406]: saving vmcore failed, _exitcode:1
    
    Above error was due to 'vmap_area_list' and 'vmlist' symbols missing
    from the vmcore.  'vmap_area_list' was removed in the linux kernel
    6.9-rc1 by the commit below:
    
        commit 55c49fee57af99f3c663e69dedc5b85e691bbe50
             mm/vmalloc: remove vmap_area_list
    
    Subsequently the commit also introduced 'VMALLOC_START' in vmcoreinfo to
    get base address of vmalloc area, instead of depending on 'vmap_area_list'
    
    Hence if 'VMALLOC_START' symbol is there in vmcoreinfo:
      1. Set vmalloc_start based on 'VMALLOC_START'
      2. Don't error if vmap_area_list/vmlist are not defined
    
    Reported-by: Sachin Sant <sachinp@linux.ibm.com>
    Signed-off-by: Aditya Gupta <adityag@linux.ibm.com>

Signed-off-by: Coiby Xu <coxu@redhat.com>

diff --git a/makedumpfile-1.7.4/arch/ppc64.c b/makedumpfile-1.7.4/arch/ppc64.c
index 3b4f91981f71d035b94282f6c7e33323a4e4c1fd..a54f9a04db7f26eac2f1bd065b134a7e2fdaeb67 100644
--- a/makedumpfile-1.7.4/arch/ppc64.c
+++ b/makedumpfile-1.7.4/arch/ppc64.c
@@ -568,7 +568,9 @@ get_machdep_info_ppc64(void)
 	/*
 	 * Get vmalloc_start value from either vmap_area_list or vmlist.
 	 */
-	if ((SYMBOL(vmap_area_list) != NOT_FOUND_SYMBOL)
+	if (NUMBER(vmalloc_start) != NOT_FOUND_NUMBER) {
+		vmalloc_start = NUMBER(vmalloc_start);
+	} else if ((SYMBOL(vmap_area_list) != NOT_FOUND_SYMBOL)
 	    && (OFFSET(vmap_area.va_start) != NOT_FOUND_STRUCTURE)
 	    && (OFFSET(vmap_area.list) != NOT_FOUND_STRUCTURE)) {
 		if (!readmem(VADDR, SYMBOL(vmap_area_list) + OFFSET(list_head.next),
@@ -689,11 +691,16 @@ vaddr_to_paddr_ppc64(unsigned long vaddr)
 	if ((SYMBOL(vmap_area_list) == NOT_FOUND_SYMBOL)
 	    || (OFFSET(vmap_area.va_start) == NOT_FOUND_STRUCTURE)
 	    || (OFFSET(vmap_area.list) == NOT_FOUND_STRUCTURE)) {
-		if ((SYMBOL(vmlist) == NOT_FOUND_SYMBOL)
-		    || (OFFSET(vm_struct.addr) == NOT_FOUND_STRUCTURE)) {
-			ERRMSG("Can't get info for vmalloc translation.\n");
-			return NOT_PADDR;
-		}
+		/*
+		 * Don't depend on vmap_area_list/vmlist if vmalloc_start is set in
+		 * vmcoreinfo, in that case proceed without error
+		 */
+		if (NUMBER(vmalloc_start) == NOT_FOUND_NUMBER)
+			if ((SYMBOL(vmlist) == NOT_FOUND_SYMBOL)
+				|| (OFFSET(vm_struct.addr) == NOT_FOUND_STRUCTURE)) {
+				ERRMSG("Can't get info for vmalloc translation.\n");
+				return NOT_PADDR;
+			}
 	}
 
 	return ppc64_vtop_level4(vaddr);
diff --git a/makedumpfile-1.7.4/makedumpfile.c b/makedumpfile-1.7.4/makedumpfile.c
index 58c6639f289f19cdbf39ed3899be9893fdc317fe..d7f1dd41d2cab526d7d40e809ddccf656c586811 100644
--- a/makedumpfile-1.7.4/makedumpfile.c
+++ b/makedumpfile-1.7.4/makedumpfile.c
@@ -2978,6 +2978,8 @@ read_vmcoreinfo(void)
 	READ_NUMBER("PAGE_OFFLINE_MAPCOUNT_VALUE", PAGE_OFFLINE_MAPCOUNT_VALUE);
 	READ_NUMBER("phys_base", phys_base);
 	READ_NUMBER("KERNEL_IMAGE_SIZE", KERNEL_IMAGE_SIZE);
+
+	READ_NUMBER_UNSIGNED("VMALLOC_START", vmalloc_start);
 #ifdef __aarch64__
 	READ_NUMBER("VA_BITS", VA_BITS);
 	READ_NUMBER("TCR_EL1_T1SZ", TCR_EL1_T1SZ);
@@ -2989,7 +2991,6 @@ read_vmcoreinfo(void)
 	READ_NUMBER("VA_BITS", va_bits);
 	READ_NUMBER_UNSIGNED("phys_ram_base", phys_ram_base);
 	READ_NUMBER_UNSIGNED("PAGE_OFFSET", page_offset);
-	READ_NUMBER_UNSIGNED("VMALLOC_START", vmalloc_start);
 	READ_NUMBER_UNSIGNED("VMALLOC_END", vmalloc_end);
 	READ_NUMBER_UNSIGNED("VMEMMAP_START", vmemmap_start);
 	READ_NUMBER_UNSIGNED("VMEMMAP_END", vmemmap_end);
diff --git a/makedumpfile-1.7.4/makedumpfile.h b/makedumpfile-1.7.4/makedumpfile.h
index c04c330b69ecbe5fb232a2eabbd2d71f14b60cc0..c31f3a4371af8aae38dcba8cac4d6de1012b4cfd 100644
--- a/makedumpfile-1.7.4/makedumpfile.h
+++ b/makedumpfile-1.7.4/makedumpfile.h
@@ -541,8 +541,6 @@ do { \
  * The value of dependence on machine
  */
 #define PAGE_OFFSET		(info->page_offset)
-#define VMALLOC_START		(info->vmalloc_start)
-#define VMALLOC_END		(info->vmalloc_end)
 #define VMEMMAP_START		(info->vmemmap_start)
 #define VMEMMAP_END		(info->vmemmap_end)
 #define PMASK			(0x7ffffffffffff000UL)
@@ -2263,6 +2261,9 @@ struct number_table {
 	long    HUGETLB_PAGE_DTOR;
 	long	phys_base;
 	long	KERNEL_IMAGE_SIZE;
+
+	unsigned long vmalloc_start;
+
 #ifdef __aarch64__
 	long 	VA_BITS;
 	long	TCR_EL1_T1SZ;
@@ -2273,7 +2274,6 @@ struct number_table {
 	long va_bits;
 	unsigned long phys_ram_base;
 	unsigned long page_offset;
-	unsigned long vmalloc_start;
 	unsigned long vmalloc_end;
 	unsigned long vmemmap_start;
 	unsigned long vmemmap_end;