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

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Message-ID: <20260203170824.2968045-1-visitorckw@gmail.com>
Date: Tue,  3 Feb 2026 17:08:22 +0000
From: Kuan-Wei Chiu <visitorckw@...il.com>
To: geert@...ux-m68k.org,
	sre@...nel.org
Cc: 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,
	Kuan-Wei Chiu <visitorckw@...il.com>
Subject: [PATCH v2 0/2] Add QEMU virt-ctrl driver and update m68k virt

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