On Wed, Feb 12, 2020 at 12:36 AM Josh Triplett <josh@xxxxxxxxxxxxxxxx> wrote: > > Virtual machines often use an ACPI power button event to tell the > machine to shut down gracefully. > > Provide an extremely lightweight "tiny power button" driver to handle > this event by signaling init directly, rather than running a separate > daemon (such as acpid or systemd-logind) that adds to startup time and > VM image complexity. > > I originally proposed a change to the ACPI power button driver to > introduce an optional path to signal init, but Rafael expressed a > preference to have this as a separate, mutually exclusive driver > instead. The result did come out much simpler, conceptually, with the > added benefit of being able to disable CONFIG_INPUT entirely for a > kernel that exclusively targets cloud/VM systems. > > The first patch in the series just moves HID definitions to > acpi/button.h in preparation for sharing them with the tiny-power-button > driver. The second patch provides the driver itself. > > Josh Triplett (2): > acpi: button: move HIDs to acpi/button.h > acpi: Add new tiny-power-button driver to directly signal init Applied as 5.7 material, thanks!
