On 12/13/2010 02:00 AM, Marcelo Tosatti wrote:
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).
To avoid adding tons of undocumented I/O ports, and to allow discoverability (what happens with a new seabios on old qemu)?
We could do this in two ways: by adding a fwcfg client to the DSDT, or by copying the information to system memory, and referencing system memory from the DSDT.