li guang <lig.f...@cn.fujitsu.com> writes: > 在 2013-05-24五的 14:45 +0300，Michael S. Tsirkin写道： >> On Wed, May 22, 2013 at 11:46:33AM +0800, liguang wrote: >> > These patches try to add ACPI Embedded Controller (EC), >> > refer-to: >> > ACPI SPEC v5 chapter 5 >> > "ACPI Embedded Controller Interface Specification" >> > >> > EC is a standard ACPI device, it plays flexible roles, >> > e.g. >> > power controller, it can control power sequence for >> > platform to enter or leave system state(0,1,3,4,5), >> > it can controller CPU fan by the temperature of sensor. >> > event carrier, it can pass events between platform >> > and OS, so OS can execute _Qxx method which defined >> > by yourself. >> > >> > So, I want to deliver CPU online/offline event between >> > OS and QEMU for CPU hotplug feature, then we will don't >> > need to "echo 1 > /sys/devices/system/cpu/cpu1/online" >> > again after 'cpu-add'. >> > >> > patches for online/offline event handler of QEUM and >> > linux kernel are writing, and will send once finished. >> > >> > since EC is a common device, so I send pathes separately. >> >> Do any non-linux guests support this device? >> > > In fact, any OSes support ACPI will support this device. > so, windows will.
When you say "any OSes supporting ACPI" I think what you really mean is that we can provide bytecode that interacts with the embedded controller. There is not explicit driver in Linux or Windows AFAIK. I still don't get the point of this. We can make ACPI hotplug work without introducing a new device like this. Regards, Anthony Liguori
