Re: [Qemu-devel] [PATCH RFC 3/3] hw/pci-host: catch acesses to unassigned pci addresses

[Peter Maydell]

On 2 September 2013 17:00, Michael S. Tsirkin <address@hidden> wrote:
> On Mon, Sep 02, 2013 at 04:53:50PM +0100, Peter Maydell wrote:
>> at the moment what happens is that the pci controller
>> creates the PCI memory and io memory regions (or cheats
>> by reusing the system memory space[*]),

>> [*] I'm pretty sure this is a bug in all platforms that do it.

> Well as usual this cheat originated with PIIX.
> AFAIK PIIX actually has a shared bus for memory and PCI
> so this is not a bug there, I think.

It will be when you introduce this "return -1 for unassigned
addresses", though, since you only want that to happen
for PCI accesses, not system memory accesses, right?

thanks
-- PMM