On Sat, Dec 11, 2010 at 09:39:30AM +0200, Avi Kivity wrote: > On 12/08/2010 07:08 PM, Marcelo Tosatti wrote: > >Use _RMV method to indicate whether device can be removed. > > > >Data is retrieved from QEMU via I/O port 0xae0c. > > > > Where did this port come from?
Its the next available address after "PCI EJ base", used for QEMU<->ACPI hotplug communication. > What's the protocol? ACPI reads the 32-bit field indicating the return value of the _RMV method (which is used by Windows to decide removability). 1-bit per slot. More ports have to be registered if more buses are added. > Maybe we should do this via fw_cfg. I don't see a need for it? (yes, it might be possible, but i'm not familiar enough with AML).