On 13 March 2013 08:01, liguang <lig.f...@cn.fujitsu.com> wrote: > By now, all devices of QEMU do not have much more > power management consideration, for example, if > system do suspend, it will call all registered notifiers, > this was loosely required, and the code to do power management > state transition seems just do 'ugly emulation', rather than be > conscious with whole system devices, same condition with reset(it > has been embedded in DeviceClass, good!), > shutdown, in real world, commonly all devices' power are controlled > by a power chip, then all power sequence can be done just > issue commands to this chip. > so, I come across an idea to implement qdev'ed power device, and > make all qdev struct of devices aware of self power management(add > on/off/wakeup/suspend ... filed for DeviceClass), this will > bring tidy power management, and the emulation will more like what > happened in real world.
I'm really dubious that this can or should be implemented by adding methods at the device base class level. I don't think real hardware works this way. You could probably do power on/off like this. Reset definitely shouldn't be done this way, and suspend probably not either. I think more documentation/discussion of what you think the semantics of the power down/up/etc should be might be useful. thanks -- PMM
