On Sun, Feb 21, 2016 at 05:01:02PM +0100, Jan Kiszka wrote: > >> We have the same problem over with VT-d and IR. > >> > >> I don't think the firmware is not the right place, otherwise there would > >> be an interface in hw to adjust that parameters. I think we should > >> simply make sure that the qemu user cannot assign devices to those > >> addresses as they are reserved for the platform devices (the HPET > >> requires another ID), or even reserve the hole bus for the platform. > > > > > > I understand, but it is the firmware that assign addresses, not QEMU/user. > > Right, buses are chosen by the firmware, but device address are > (optionally) under user control. > > > We need a way to tell the firmware not to use a certain address range, > > we can do that > > with fw_config I suppose. > > The pseudo addresses of IOAPIC and HPET are part of ACPI tables, both on > AMD and Intel. Firmware can evaluate them easily.
Hi, Jan, Marcel, Could you give me some hint on how to achieve this using fw_config (restriction on PCI bus numbers)? I failed to find it out myself. Thanks in advance. -- peterx
