Shutdown notification to guest on window close

[X547]

Currently closing RVVM window cause instant shutdown that give no chance to gratefully shutdown guest and may cause data loss.

[LekKit]

Currently closing RVVM window cause instant shutdown that give no chance to gratefully shutdown guest and may cause data loss.

Somewhat trying to improve on that to at least not kill the process immediately (bf692d4 and similar), this at least flushes the blkdev caches. No idea how to make a graceful shutdown notification for the guest tho (That would be best).
We don't have ACPI for power button or anything like that on RISC-V afaik. USB HID has power keycode. Maybe you know other ways to notify guests about shutdown?

[LekKit]

Status: If I2C HID has same keycodes as USB HID, and the HID_KEY_POWER will be properly handled by guests, this may be resolved soon (See #58).
If that approach fails, this most likely won't be worked on.

[X547]

This should help: https://www.kernel.org/doc/Documentation/devicetree/bindings/power/reset/gpio-poweroff.txt

[LekKit]

This should help: https://www.kernel.org/doc/Documentation/devicetree/bindings/power/reset/gpio-poweroff.txt

A bit of research reveals this signals same KEY_POWER event to the guest through internal kernel facilities on Linux, I.e. not much different from pressing HID_KEY_POWER using existing devices.
For handling KEY_POWER, udev rules are needed (or some systemd magic) which means this is never going to work for Linux guests without additional configuration within them.

I tested bunch of distros (Ubuntu, Debian, Arch) with extended DEs like KDE Plasma, everyone happily ignored HID_KEY_POWER until I manually added an udev rule.
Haiku doesn't handle HID_KEY_POWER from i2c hid as well it seems.