linux-kernel - Re: [PATCH v5 0/2] arm64: Fix pending single-step debugging issues

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Message-ID: <CAFA6WYOucB3JdVATbydxYuAb0Q5P7ff_JMb=-BgiF+uip8pdpg@mail.gmail.com>
Date:   Thu, 12 Jan 2023 14:52:49 +0530
From:   Sumit Garg <sumit.garg@...aro.org>
To:     will@...nel.org, catalin.marinas@....com
Cc:     liwei391@...wei.com, mhiramat@...nel.org, maz@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        mark.rutland@....com, daniel.thompson@...aro.org,
        dianders@...omium.org
Subject: Re: [PATCH v5 0/2] arm64: Fix pending single-step debugging issues

Hi Will, Catalin,

On Mon, 19 Dec 2022 at 15:55, Sumit Garg <sumit.garg@...aro.org> wrote:
>
> This patch-set reworks pending fixes from Wei's series [1] to make
> single-step debugging via kgdb/kdb on arm64 work as expected. There was
> a prior discussion on ML [2] regarding if we should keep the interrupts
> enabled during single-stepping. So patch #1 follows suggestion from Will
> [3] to not disable interrupts during single stepping but rather skip
> single stepping within interrupt handler.
>
> [1] https://lore.kernel.org/all/20200509214159.19680-1-liwei391@huawei.com/
> [2] https://lore.kernel.org/all/CAD=FV=Voyfq3Qz0T3RY+aYWYJ0utdH=P_AweB=13rcV8GDBeyQ@mail.gmail.com/
> [3] https://lore.kernel.org/all/20200626095551.GA9312@willie-the-truck/
>
> Changes in v5:
> - Incorporated misc. comments from Mark.
>

Since patch #1 has already been reviewed/acked by Mark and the
complete patchset has been tested by Doug, would it be fine for you to
pick up this patchset? It fixes a real single stepping problem for
kgdb on arm64.

-Sumit

> Changes in v4:
> - Rebased to the tip of mainline.
> - Picked up Doug's Tested-by tag.
>
> Changes in v3:
> - Reword commit descriptions as per Daniel's suggestions.
>
> Changes in v2:
> - Replace patch #1 to rather follow Will's suggestion.
>
> Sumit Garg (2):
>   arm64: entry: Skip single stepping into interrupt handlers
>   arm64: kgdb: Set PSTATE.SS to 1 to re-enable single-step
>
>  arch/arm64/include/asm/debug-monitors.h |  1 +
>  arch/arm64/kernel/debug-monitors.c      |  5 +++++
>  arch/arm64/kernel/entry-common.c        | 22 ++++++++++++++++++++--
>  arch/arm64/kernel/kgdb.c                |  2 ++
>  4 files changed, 28 insertions(+), 2 deletions(-)
>
> --
> 2.34.1
>