linux-kernel - Re: [PATCH V6 0/6] RISC-V fixups to work with crash tool

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Message-ID: <22AAF52E-8CC8-4D11-99CB-88DE4D113444@kernel.org>
Date:   Thu, 13 Oct 2022 06:24:47 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Xianting Tian <xianting.tian@...ux.alibaba.com>,
        Conor Dooley <conor.dooley@...rochip.com>
CC:     Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        aou@...s.berkeley.edu, anup@...infault.org, heiko@...ech.de,
        guoren@...nel.org, mick@....forth.gr,
        alexandre.ghiti@...onical.com, bhe@...hat.com, vgoyal@...hat.com,
        dyoung@...hat.com, corbet@....net, kexec@...ts.infradead.org,
        linux-doc@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, crash-utility@...hat.com,
        heinrich.schuchardt@...onical.com, k-hagio-ab@....com,
        hschauhan@...ltrace.org, yixun.lan@...il.com
Subject: Re: [PATCH V6 0/6] RISC-V fixups to work with crash tool



On 13 October 2022 03:28:09 IST, Xianting Tian <xianting.tian@...ux.alibaba.com> wrote:
>
>在 2022/10/12 下午5:52, Conor Dooley 写道:
>> On Wed, Oct 12, 2022 at 05:42:37PM +0800, Xianting Tian wrote:
>>> 在 2022/8/12 上午12:17, Palmer Dabbelt 写道:
>>>> On Thu, 11 Aug 2022 00:41:44 PDT (-0700),
>>>> xianting.tian@...ux.alibaba.com wrote:
>>>>> I ever sent the patch 1 in the link:
>>>>> https://patchwork.kernel.org/project/linux-riscv/patch/20220708073150.352830-3-xianting.tian@linux.alibaba.com/
>>>>> 
>>>>> And patch 2,3 in the link:
>>>>> https://patchwork.kernel.org/project/linux-riscv/patch/20220714113300.367854-2-xianting.tian@linux.alibaba.com/
>>>>> 
>>>>> https://patchwork.kernel.org/project/linux-riscv/patch/20220714113300.367854-3-xianting.tian@linux.alibaba.com/
>>>>> 
>>>>> 
>>>>> This patch set just put these patches together, and with three new
>>>>> patch 4, 5, 6.
>>>>> these six patches are the fixups for machine_kexec, kernel mode PC
>>>>> for vmcore
>>>>> and improvements for vmcoreinfo, memory layout dump and fixup
>>>>> schedule out issue
>>>>> in machine_crash_shutdown().
>>>>> 
>>>>> The main changes in the six patchs as below,
>>>>> Patch 1: Fixup use of smp_processor_id() in preemptible context, to
>>>>> cleanup
>>>>>           the console prints.
>>>>> Patch 2: Fixup to get correct kernel mode PC for kernel mode regs
>>>>> for vmcore.
>>>>> Patch 3: Fixup schedule out issue in machine_crash_shutdown()
>>>>> Patch 4: Add modules to virtual kernel memory layout dump.
>>>>> Patch 5: Add VM layout, va bits, ram base to vmcoreinfo, which can
>>>>> simplify
>>>>>           the development of crash tool as ARM64 already did
>>>>>           (arch/arm64/kernel/crash_core.c).
>>>>> Patch 6: Updates vmcoreinfo.rst for vmcoreinfo export for RISCV64.
>>>>> 
>>>>> With these six patches(patch 2 is must), crash tool can work well to
>>>>> analyze
>>>>> a vmcore. The patches for crash tool for RISCV64 is in the link:
>>>>> https://lore.kernel.org/linux-riscv/20220801043040.2003264-1-xianting.tian@linux.alibaba.com/
>>>>> 
>>>>> 
>>>>> ------
>>>>> Changes v1 -> v2:
>>>>>    1, remove the patch "Add a fast call path of crash_kexec()" from
>>>>> this series
>>>>>       of patches, as it already applied to riscv git.
>>>>> https://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git/commit/?h=for-next&id=3f1901110a89b0e2e13adb2ac8d1a7102879ea98
>>>>>    2, add 'Reviewed-by' based on the comments of v1.
>>>>> Changes v2 -> v3:
>>>>>    use "riscv" instead of "riscv64" in patch 5 subject line.
>>>>> Changes v3 -> v4:
>>>>>    use "riscv" instead of "riscv64" in the summary of patch 5 subject
>>>>> line.
>>>>> Changes v4 -> v5:
>>>>>    add a new patch "RISC-V: Fixup schedule out issue in
>>>>> machine_crash_shutdown()"
>>>>> Changes v5 -> v6:
>>>>>    1, move "fixup" patches to the start of the patch set.
>>>>>    2, change patch 1, 2, 6's subject to make it tell more what it's
>>>>> about.
>>>>>    3, add Fixes for patch 3.
>>>>>    4, adjuest the changes format for patch 6.
>>>>> 
>>>>> 
>>>>> Xianting Tian (6):
>>>>>    RISC-V: kexec: Fixup use of smp_processor_id() in preemptible context
>>>>>    RISC-V: Fixup get incorrect user mode PC for kernel mode regs
>>>>>    RISC-V: Fixup schedule out issue in machine_crash_shutdown()
>>>>>    RISC-V: Add modules to virtual kernel memory layout dump
>>>>>    RISC-V: Add arch_crash_save_vmcoreinfo support
>>>>>    Documentation: kdump: describe VMCOREINFO export for RISCV64
>>>>> 
>>>>>   .../admin-guide/kdump/vmcoreinfo.rst          | 31 +++++++++++++++++++
>>>>>   arch/riscv/kernel/Makefile                    |  1 +
>>>>>   arch/riscv/kernel/crash_core.c                | 29 +++++++++++++++++
>>>>>   arch/riscv/kernel/crash_save_regs.S           |  2 +-
>>>>>   arch/riscv/kernel/machine_kexec.c             | 28 ++++++++++++++---
>>>>>   arch/riscv/mm/init.c                          |  4 +++
>>>>>   6 files changed, 89 insertions(+), 6 deletions(-)
>>>>>   create mode 100644 arch/riscv/kernel/crash_core.c
>>>> Thank.  I've taken the first 4 onto for-next, which is still targeted
>>>> for 5.20, as they're fixes.  I'm not opposed to taking the documentation
>>>> patch for this cycle as well, it just needs some going-over as the
>>>> wording looks very odd (or at least it does to me right now, maybe I'm
>>>> just still half asleep).  Patch 5 is a new feature, and given that it's
>>>> being spun during the merge window it's too late.
>>> Hi Palmer
>>> 
>>> Do you plan to merge the two patch to Linux 6.1 to support crash tool work?
>>> thanks
>>> 
>>>    RISC-V: kexec: Fixup use of smp_processor_id() in preemptible context
>> 357628e68f5c ("RISC-V: kexec: Fixup use of smp_processor_id() in preemptible context"
>> 
>>>    RISC-V: Fixup get incorrect user mode PC for kernel mode regs
>> 59c026c359c3 ("RISC-V: Fixup get incorrect user mode PC for kernel mode regs")
>> 
>> Hey Xianting, those two commits already seem to have been applied, do
>> you perhaps instead mean the documentation patch and the addition of
>> support for arch_crash_save_vmcoreinfo? I recalled asking if you needed
>> to respin at the time, but do not see a response:
>> https://lore.kernel.org/linux-riscv/39fdc85e-b2d5-863c-4878-4b3380d76bc4@microchip.com/
>> IIRC Bagas had some outstanding comments on the documentation change
>> too. Was I incorrect?
>
>Sorry, It is the two patches:
>
>  RISC-V: Add arch_crash_save_vmcoreinfo support
>  Documentation: kdump: describe VMCOREINFO export for RISCV64
>
>I saw Palmer already merged the two patches to his riscv-crash branch, it means they are OK?

Dunno, but no harm in resending given it's been a while cycle since then.

>
>https://git.kernel.org/pub/scm/linux/kernel/git/palmer/linux.git/log/?h=riscv-crash
>
>I saw Bagas's comments, I will send new version patch for the two patches, thanks for the reminder.
>
>> 
>> Thanks,
>> Conor.