Re: [PATCH v4 0/2] Add QEMU virt-ctrl driver and update m68k virt

Geert Uytterhoeven
2026-04-13T10:19:59Z

Hi Kuan-Wei,

On Sun, 12 Apr 2026 at 23:20, Kuan-Wei Chiu <visitorckw@gmail.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)',
> 'reboot(LINUX_REBOOT_CMD_POWER_OFF)', and
> 'reboot(LINUX_REBOOT_CMD_HALT)' from userspace.
>
> Link: https://gitlab.com/qemu-project/qemu/-/blob/v10.2.0/hw/misc/virt_ctrl.c [1]
> ---
> Changes in v4:
> - Fix sparse warning caught by kernel test robot.
> - Pass the struct qemu_virt_ctrl context to sys-off handlers instead of
> the __iomem pointer.

Thanks I replaced v3 with v4 in my queue in the m68k tree for v7.1,
and will postpone my PR by a few days to give it some coverage in
linux-next.

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds