Date: Mon, 27 Sep 2021 14:29:25 +0800
From: lijiang <lijiang@redhat.com>
To: "Discussion list for crash utility usage, maintenance and
development" <crash-utility@redhat.com>
Subject: Re: [Crash-utility] [PATCH] arm64 : assign page_offset and
kvbase based on VA_BITS passed
Message-ID:
<CANU+ZyffmHocjiXy1F1v7YPdRtQ+eeukXXT-PXsW2H5Q2cHEfA@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
>> Date: Thu, 23 Sep 2021 01:46:31 +0530
>> From: Ankur Bansal <er.ankurbansal@gmail.com>
>> To: crash-utility@redhat.com
>> Cc: Ankur Bansal <er.ankurbansal@gmail.com>
>> Subject: [Crash-utility] [PATCH] arm64 : assign page_offset and kvbase
>> based on VA_BITS passed
>> Message-ID:
>> <1632341791-10205-1-git-send-email-er.ankurbansal@gmail.com>
>> Content-Type: text/plain; charset="US-ASCII"
>>
>> assign page_offset and kvbase based on VA_BITS passed
>>
>Thank you for the patch, Ankur.
>Can you help to describe the reason in detail? And what happened?
Hi Lianbo, Raw ramdump without vmcoreinfo doesn't work here.
read_vmcoreinfo("NUMBER(BA_BITS)") will not work on raw ramdump.
getting below error
crash_64: vmlinux and /var/tmp/ramdump_elf_XUtCMT do not match!
Usage:
crash [OPTION]... NAMELIST MEMORY-IMAGE[
@address] (dumpfile form)
crash [OPTION]... [NAMELIST] (live system form)
Enter "crash_64 -h" for details.
3987 static void
3988 arm64_calc_VA_BITS(void)
3989 {
3990 int bitval;
3991 struct syment *sp;
3992 ulong vabits_actual, value;
3993 char *string;
3994
3995 if ((string = pc->read_vmcoreinfo("NUMBER(VA_BITS)"))) {
3996 value = atol(string);
3997 free(string);
3998 machdep->machspec->CONFIG_ARM64_VA_BITS = value;
3999 }
>Thanks.
>Lianbo
>> Change-Id: I525f3c7fd91e1f06e909c2f4c1749c44c068baea
>> Signed-off-by: Ankur Bansal <er.ankurbansal@gmail.com>
>> ---
>> arm64.c | 15 +++++++++++----
>> 1 file changed, 11 insertions(+), 4 deletions(-)
>>
>> diff --git a/arm64.c b/arm64.c
>> index 7069312..2dc77f7 100644
>> --- a/arm64.c
>> +++ b/arm64.c
>> @@ -220,10 +220,17 @@ arm64_init(int when)
>>
>> /* vabits_actual introduced after mm flip, so it should be flipped layout */
>> if (ms->VA_BITS_ACTUAL) {
>> - ms->page_offset = ARM64_FLIP_PAGE_OFFSET;
>> - /* useless on arm64 */
>> - machdep->identity_map_base = ARM64_FLIP_PAGE_OFFSET;
>> - machdep->kvbase = ARM64_FLIP_PAGE_OFFSET;
>> + if ((pc->flags2 & SNAP)) {
>> + ms->page_offset = ARM64_FLIP_PAGE_OFFSET;
>> + /* useless on arm64 */
>> + machdep->identity_map_base = ARM64_FLIP_PAGE_OFFSET;
>> + machdep->kvbase = ARM64_FLIP_PAGE_OFFSET;
>> + }
>> + else{
>> + ms->page_offset = ARM64_FLIP_PAGE_OFFSET_ACTUAL;
>> + machdep->identity_map_base = ARM64_FLIP_PAGE_OFFSET_ACTUAL;
>> + machdep->kvbase = ARM64_FLIP_PAGE_OFFSET_ACTUAL;
>> + }
>> ms->userspace_top = ARM64_USERSPACE_TOP_ACTUAL;
>> } else {
>> ms->page_offset = ARM64_PAGE_OFFSET;
>> --
>> 2.7.4
------------------------------
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