Re: Kdump on ARM64

[Anurup M <anurup.m@huawei.com>]

Hi Akashi,

	Thanks for the reply.

Hi  Akashi, Geoff,

	In the code I could find assert(arm64_mem.memstart) in the function virt_to_phys. This address can be 0x0 when the
  segment start address is 0x0. so can we use this assert?

	The code flow is elf_arm64_load->load_crashdump_segments->add_buffer_phys_virt->add_segment_phys_virt->virt_to_phys
  and this call is also before the call to load_elf_exec_in_crashmem which init's arm64_mem.memstart to crash_reserved_mem.start.
  So arm64_mem.memstart is also not set before the call to virt_to_phys.

	Please share your comments.

Thanks,
Anurup


On 1/8/2015 1:40 PM, AKASHI Takahiro wrote:
> Hi Anurup,
> 
> On 01/08/2015 03:35 PM, Anurup M wrote:
>> Hi Akashi, Geoff,
>>
>>     I tried to check kdump on arm64 on Foundation model. The/proc/vmcore is generated.
>> But I couldnot check if it is proper. Is there a makedumpfile binary for arm64? and also crash tool.
>> I used the master branch of https://git.linaro.org/people/geoff.levand/linux-kexec.git to verify.
>>       Please provide some information about the current status or support for kdump on arm64?
>> and the ways to verify or start development on Foundation model.
> 
> The story is that I used to work on kdump, but handed it off
> to Geoff at some time. Since then, he merged it into his repo
> but I don't think that he has tested (verified) it yet.
> So please take it as a study work (or prototype), although I'm
> pretty sure that it works well on model except some issues.
> 
> Regarding /proc/vmcore, if you can retrieve it to your host machine,
> you can simply verify the contents as follows:
>   $ aarch64-linux-gnu-gdb vmlinux core(=vmcore)
>   (gdb) info threads
>   (gdb) bt
>    ...
> 
> I also have a trivial patch for crash tool to cross-build it, but
> arm64 support (by RedHat folk) is already there.
> 
> Thanks,
> -Takahiro AKASHI
> 
>> Thanks,
>> Anurup M
>>
> 

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