linux-kernel - Re: [PATCH v2 0/2] Add QEMU virt-ctrl driver and update m68k virt

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Message-ID: <CAMuHMdUMBoLd8cKXMK64qjGfTqQfK21mDAXMh8DdJHkL7QbDVQ@mail.gmail.com>
Date: Wed, 4 Feb 2026 08:56:39 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Kuan-Wei Chiu <visitorckw@...il.com>
Cc: sre@...nel.org, jserv@...s.ncku.edu.tw, eleanor15x@...il.com, 
	daniel@...f.com, linux-kernel@...r.kernel.org, 
	linux-m68k@...ts.linux-m68k.org, linux-pm@...r.kernel.org, 
	Laurent Vivier <laurent@...ier.eu>
Subject: Re: [PATCH v2 0/2] Add QEMU virt-ctrl driver and update m68k virt

CC vivier

On Tue, 3 Feb 2026 at 18:08, Kuan-Wei Chiu <visitorckw@...il.com> wrote:
> Introduce a generic platform driver for the QEMU 'virt-ctrl' device [1]
> and transitions the m68k 'virt' machine to use it, replacing
> architecture-specific hooks.
>
> The new driver ('qemu-virt-ctrl') registers a restart handler and
> populates the global 'pm_power_off' callback.
>
> On the m68k side, the platform initialization is updated to register
> the 'qemu-virt-ctrl' platform device. Additionally, the 'mach_reset'
> hook is bridged to 'do_kernel_restart()' to ensure the kernel's restart
> handler chain is correctly invoked.
>
> Verified on QEMU m68k virt. Both system reset and power-off were
> confirmed functional by invoking 'reboot(LINUX_REBOOT_CMD_RESTART)' and
> 'reboot(LINUX_REBOOT_CMD_POWER_OFF)' from userspace.
>
> Link: https://gitlab.com/qemu-project/qemu/-/blob/v10.2.0/hw/misc/virt_ctrl.c [1]
> ---
> Changes in v2:
> - Use devm_register_sys_off_handler() instead of register_restart_handler()
>   and global pm_power_off.
> - Switch Kconfig to tristate to support modular build.
> - Add .id_table to platform_driver and use MODULE_DEVICE_TABLE() to correct
>   module auto-loading.
>
> v1: https://lore.kernel.org/lkml/20260112182258.1851769-1-visitorckw@gmail.com/
>
> Kuan-Wei Chiu (2):
>   power: reset: Add QEMU virt-ctrl driver
>   m68k: virt: Switch to qemu-virt-ctrl driver
>
>  MAINTAINERS                          |  6 ++
>  arch/m68k/virt/config.c              | 42 +------------
>  arch/m68k/virt/platform.c            | 20 ++++++-
>  drivers/power/reset/Kconfig          | 10 ++++
>  drivers/power/reset/Makefile         |  1 +
>  drivers/power/reset/qemu-virt-ctrl.c | 89 ++++++++++++++++++++++++++++
>  6 files changed, 124 insertions(+), 44 deletions(-)
>  create mode 100644 drivers/power/reset/qemu-virt-ctrl.c
>
> --
> 2.53.0.rc1.225.gd81095ad13-goog