On Mon, Aug 12, 2013 at 08:37:00AM +0200, Gerd Hoffmann wrote: > Hi, > > > If we make it a rule that PCI is`setup before ACPI tables > > are read, then QEMU can do the patching itself when > > it detects BIOS reading the tables. > > Approach makes sense to me. The ordering constrain shouldn't be a big > burden, hardware detection+bringup (including pci setup) is the first > thing done by the firmware, loading/generating acpi tables is one of the > last things. And it avoids the need to communicate the addresses (or > patch locations) between qemu+firmware. > > What do you want to use this for? pmbase and xbar are simple, they are > just a single register read. pci io windows needs a root bus scan, but > should be doable too.
Right. We'll need to migrate the offsets for patching since they are tied to specific AML and this can change. > > Gerd, Laszlo,others, does this rule work for alternative firmwares? > > It surely works for coreboot, and I would be very surprised if this > causes trouble for ovmf. > > cheers, > Gerd
